Outer rotor motor, fan comprising outer rotor motor and range hood comprising outer rotor motor

Abstract

The utility model discloses an external rotor motor, a fan comprising the external rotor motor, and a range hood comprising the external rotor motor. The outer rotor assembly comprises two shell parts, the stator assembly comprises a stator core, the shell parts are spliced to form a containing cavity, the stator core is located in the containing cavity, one or more hollow-out areas are formed in each of the two shell parts, the hollow-out areas are communicated with the containing cavity and the outside, and the stator core is located in the containing cavity. At least one of the shell parts is used for being connected with an impeller. According to the utility model, the output capability of the external rotor motor is effectively improved. And meanwhile, the hollow area not only opens an air duct, but also allows air to enter the accommodating cavity, so that the interior is cooled. And the influence of the outer rotor motor on the fan performance is reduced as much as possible.

Description

Technical Field

[0001] The utility model relates to the field of range hoods. Background Art

[0002] Existing range hoods generally use fans to suck out oil smoke. When fans are used in range hoods, the usual driving method is to use an inner rotor motor. Although outer rotor motors are used in other fields, there are some problems with current outer rotor motors, which prevent them from being widely used in range hoods. Due to the structure of the outer rotor itself, the outer rotor motor is large in size and weight, and the amount of silicon steel used in the stator core is large, but the utilization rate is low, and the large diameter will block the fan duct, affecting the fan performance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the outer rotor motor affects the performance of the fan, and to provide an outer rotor motor, a fan including the same, and a range hood.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] An outer rotor motor comprises an outer rotor assembly, a stator assembly and a motor shaft, wherein the outer rotor assembly comprises two shell components, and the stator assembly comprises a stator core, wherein the shell components are assembled to form a receiving cavity, and the stator core is located in the receiving cavity, and one or more hollow areas are respectively formed on the two shell components, wherein the hollow areas connect the receiving cavity with the outside world, and at least one of the shell components is used to connect an impeller.

[0006] In this solution, the shell component is directly used as the output end, and the weight of the shell component is reduced by the hollow area, thereby reducing the moment of inertia of the outer rotor assembly and effectively improving the output capacity of the outer rotor motor. At the same time, the hollow area not only opens the air duct, but also allows air to enter the cavity to dissipate heat inside, thus minimizing the impact of the outer rotor motor on the fan performance.

[0007] Preferably, one or more hollow areas and shaft connection holes are formed on the stator core, and the motor shaft is fixedly connected to the shaft connection hole. The hollow design of the stator core can reduce the use of materials, such as reducing the use of silicon steel and reducing the waste of silicon steel.

[0008] Preferably, in the projection along the axial direction of the motor shaft, the hollow area of ​​the stator core and the hollow area of ​​the shell component at least partially overlap. Thus, the hollow areas of the shell components on both sides and the hollow areas of the stator core together form a connected channel, which can more effectively discharge the internal heat on the one hand, and is also beneficial to the air intake of the fan on the other hand.

[0009] Preferably, the stator core includes a yoke, wherein in the radial direction relative to the center of the stator core, the inward extension of the boundary of the hollow region of the stator core does not touch the shaft connection hole, and the outward extension of the boundary of the hollow region does not exceed the inner boundary of the yoke. This can avoid the thickness of the stator yoke being cut off, thereby ensuring that the magnetic circuit of the stator is unobstructed.

[0010] Preferably, a bearing mounting seat is provided on the housing component, and the bearing mounting seat is used to accommodate a bearing connected to the motor shaft, wherein in a radial direction relative to the center of the housing component, the inward extension of the boundary of the hollow area of ​​the housing component does not exceed the outer boundary of the bearing mounting seat. The bearing mounting seat supports the motor shaft, and limiting the boundary of the hollow area can avoid affecting the supporting strength of the bearing mounting seat.

[0011] Preferably, the stator core is provided with stator slots, wherein in the radial direction relative to the center of the shell component, the outward extension of the boundary of the hollow area of ​​the shell component does not exceed the bottom of the stator slot. Thus, the shell component can shield the winding on the stator core, preventing the winding from being directly exposed and contaminated by oil smoke.

[0012] Preferably, the housing component includes a central accommodating area and an annular mounting area formed on the periphery, and the two housing components are fixedly connected together through the mounting area, and the two housing areas enclose the accommodating cavity. The annular mounting area can provide connections in various directions to ensure the firmness of the connection of the outer rotor assembly. Moreover, the mounting area is staggered from the accommodating area to avoid the connection with the impeller affecting the internal structure, and further, the connection between the impeller and the housing component and the connection between the housing components can be completed at the same time.

[0013] A fan comprises a volute and an impeller, the fan further comprises a mounting bracket and an outer rotor motor as described above, wherein the mounting bracket is connected to the impeller and the housing component respectively, and the motor shaft is fixed relative to the volute.

[0014] Preferably, the mounting bracket is formed integrally with the impeller or the housing component, and / or a hollow area is provided on the mounting bracket. The hollow mounting bracket can further reduce the weight and moment of inertia, effectively improving the output capacity of the outer rotor motor. And the hollow area can be opened as an air duct to provide more air intake.

[0015] A range hood comprises the outer rotor motor.

[0016] The positive progress of the utility model is that the utility model effectively improves the output capacity of the outer rotor motor. At the same time, the hollow area not only opens the air duct, but also allows air to enter the cavity to dissipate heat inside, and minimizes the impact of the outer rotor motor on the fan performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front connection between the outer rotor motor and the fan in a preferred embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the back connection between the outer rotor motor and the fan in a preferred embodiment of the utility model.

[0019] Figure 3 It is a three-dimensional schematic diagram of an outer rotor motor according to a preferred embodiment of the utility model.

[0020] Figure 4 It is a three-dimensional schematic diagram of the shell component of a preferred embodiment of the utility model.

[0021] Figure 5 It is a front view schematic diagram of the shell component of a preferred embodiment of the utility model.

[0022] Figure 6 It is a front view schematic diagram of the stator core of a preferred embodiment of the utility model.

[0023] Figure 7 It is a three-dimensional schematic diagram of the housing component and the stator core of a preferred embodiment of the utility model.

[0024] Figure 8 It is a front view schematic diagram of the housing component and the stator core of a preferred embodiment of the utility model.

[0025] Fig. 9 It is a front view schematic diagram of a mounting bracket according to a preferred embodiment of the utility model.

[0026] Fig.10 It is a three-dimensional schematic diagram of a volute of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0027] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0028] like Figure 1-Figure 3 As shown, this preferred embodiment discloses an outer rotor motor 100, including an outer rotor assembly, a stator assembly and a motor shaft 130, wherein the outer rotor assembly includes two housing components 110, and the stator assembly includes a stator core 120, wherein Figure 4 and Figure 5The shell components 110 shown are assembled to form a accommodating cavity 140, and the stator core 120 is located in the accommodating cavity 140. One or more hollow areas 113 are respectively formed on the two shell components 110, and the hollow areas connect the accommodating cavity 140 with the outside world. At least one of the shell components 110 is used to connect the impeller 200.

[0029] In the present embodiment, the hollow regions 113 are configured as four surrounding sectors. In other implementations, the hollow regions 113 may be configured as hollow regions 113 of different numbers, shapes and distributions.

[0030] The stator assembly in this embodiment also includes windings and other structures, which are not shown in the figure. When implemented, the stator assembly can be adaptively adjusted according to the relevant components existing in the stator assembly of other existing external rotor motors and then applied to this embodiment. For example, the windings are bundled in a Figure 6 The stator teeth 126 between the adjacent stator slots 121 are shown. The shape of the stator teeth 126 can be adjusted according to actual needs.

[0031] As shown in the figure, when the outer rotor assembly in this embodiment is implemented, the outer rotor assembly of other existing outer rotor motors can be adaptively adjusted and applied to this embodiment. Figure 7 As shown, the outer rotor assembly of this embodiment further includes a permanent magnet 150. The permanent magnet 150 is fixed between the two housing components 110 and surrounds the outer side of the stator core 120.

[0032] In this embodiment, the housing component 110 directly serves as the output terminal, and the weight of the housing component 110 is reduced by the hollow area 113, thereby reducing the moment of inertia of the outer rotor assembly, and effectively improving the output capacity of the outer rotor motor 100. At the same time, the hollow area 113 not only opens the air duct, but also allows air to enter the accommodating cavity 140 to dissipate heat inside, thereby minimizing the impact of the outer rotor motor 100 on the fan performance.

[0033] like Figure 6 and Figure 7 As shown, one or more hollow areas 123 and shaft connection holes 125 are preferably formed on the stator core 120 of this embodiment, and the motor shaft 130 is fixedly connected to the shaft connection hole 125. The hollow areas 123 of this embodiment are set as 4 surrounding sectors, and part of the solid structure is retained between adjacent hollow areas 123 to form spokes to connect the solid structure on the peripheral side of the shaft connection hole 125 and the solid structure outside the hollow area 123. In other embodiments, hollow areas 123 of different numbers, shapes and distributions can also be set. The hollow design of the stator core 120 can reduce the use of materials, such as reducing the use of silicon steel and reducing the waste of silicon steel.

[0034] like Figure 7 and Figure 8 As shown, in the projection along the axial direction of the motor shaft 130, the hollow area 123 of the stator core 120 preferably overlaps at least partially with the hollow area 113 of the housing component 110. Thus, the hollow areas 113 of the housing component 110 and the hollow areas 123 of the stator core 120 on both sides form a connected channel, which can more effectively discharge the internal heat on the one hand, and is also beneficial to the air intake of the fan on the other hand.

[0035] like Figure 6 and Figure 7 As shown, the stator core 120 of the present embodiment preferably includes a yoke 124, wherein, in the radial direction relative to the center of the stator core 120, the inward extension of the boundary of the hollow area 123 of the stator core 120 does not touch the shaft connection hole 125, and the outward extension of the boundary of the hollow area 123 does not exceed the inner boundary of the yoke 124. Specifically, the diameter of the circumference formed by the inner boundaries of the four hollow areas 123 is larger than the diameter of the shaft connection hole 125, so as to retain the support of the shaft connection hole 125 by a number of solid structures. The diameter of the circumference formed by the outer boundaries of the four hollow areas 123 is smaller than the diameter of the inner boundary of the yoke 124, and the inner boundary of the yoke 124 is the inner boundary of the yoke 124 theoretically at the minimum allowable thickness. Among them, Figure 6 The dotted circle in the middle shows the inner boundary of the yoke 124 when the thickness is the minimum allowable in theory. At this time, the thickness H of the yoke 124 (the outer boundary of the yoke 124 is the circumference formed by the bottom 122 of the stator slot 121, as shown in FIG. Figure 6 In this way, the thickness H of the stator yoke 124 can be prevented from being excessively cut off, thereby ensuring that the magnetic circuit of the stator is unobstructed.

[0036] like Figure 4 and Figure 5 As shown, a bearing mounting seat 114 is provided on the shell component 110 of the present embodiment, and the bearing mounting seat 114 is used to accommodate a bearing connected to the motor shaft 130, wherein in the radial direction relative to the center of the shell component 110, the boundary of the hollow area 113 of the shell component 110 does not extend inward beyond the outer boundary of the bearing mounting seat 114. That is, the diameter of the circle formed by the inner boundary of the hollow area 113 is greater than or equal to the diameter of the bearing mounting seat 114. The bearing mounting seat 114 supports the motor shaft 130, and limiting the boundary of the hollow area can avoid affecting the supporting strength of the bearing mounting seat 114. In the present embodiment, part of the solid structure is retained between adjacent hollow areas 113 to form spokes to connect the solid structure on the circumferential side of the bearing mounting seat 114 and the solid structure outside the hollow area 113.

[0037] like Figure 7 and Figure 8As shown, the stator core 120 of this embodiment is provided with a stator slot 121, wherein in the radial direction relative to the center of the housing component 110, the outward extension of the boundary of the hollow area 113 of the housing component 110 does not exceed the bottom 122 of the stator slot 121. Thus, the housing component 110 can shield the winding on the stator core 120, preventing the winding from being directly exposed and contaminated by oil smoke. In the case of no range hood or good operating environment, the outward extension of the boundary of the hollow area 113 can exceed the bottom 122 of the stator slot 121.

[0038] like Figure 4 and Figure 5 As shown, the housing component 110 of this embodiment includes a central accommodating area 111 and an annular mounting area 112 formed on the periphery. The two housing components 110 are fixedly connected together through the mounting area 112, and the two accommodating areas 111 enclose a accommodating cavity 140. The annular mounting area 112 can provide connections in various directions to ensure the firm connection of the outer rotor assembly. In addition, the mounting area 112 is staggered from the accommodating area 111, which can avoid the connection with the impeller 200 affecting the internal structure, and further, the connection between the impeller 200 and the housing component 110 and the connection between the housing components 110 can be completed at the same time.

[0039] like Fig.10 As shown, this embodiment also discloses a fan, including a volute 500 and an impeller 200, the fan also includes a mounting bracket 300 and an outer rotor motor 100, wherein the mounting bracket 300 is connected to the impeller 200 and the housing component 110 respectively, and the motor shaft 130 is fixed relative to the volute 500. Figure 2 As shown, the rear end (relative to the air inlet direction) of the motor shaft 130 of this embodiment is fixed to the fixing member 400, and the fixing member 400 is fixed to the volute 500. The stator core 120 is circumferentially fixedly connected to the motor shaft 130, so that the stator core 120 is relatively fixed in the circumferential direction.

[0040] like Figure 8 and 9As shown, the outer ring side of the mounting bracket 300 of this embodiment is connected to the rear end cover 210 (inlet direction) of the impeller 200, and the inner ring side is connected to the shell component 110, and the connection method is not limited to riveting, threaded connection, etc. Among them, the preferred mounting bracket 300 is formed as a whole with the impeller 200 or the shell component 110. In this embodiment, when specifically connected, the annular inner area 310 of the mounting bracket 300 is connected to the mounting area 112 of the shell component 110. The inner diameter of the inner area 310 is larger than the outer diameter B of the accommodating area 111, and the outer diameter is smaller than the outer diameter A of the mounting area 112. A hollow area 320 is further provided on the mounting bracket 300 of this embodiment. The hollow mounting bracket 300 can further reduce the weight and moment of inertia, and effectively improve the output capacity of the outer rotor motor 100. And the hollow area can be opened as an air duct to provide more air intake.

[0041] This embodiment also discloses a range hood, which includes an outer rotor motor 100 .

[0042] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. An outer rotor motor, comprising an outer rotor assembly, a stator assembly and a motor shaft, characterized in that: The outer rotor assembly includes two shell components, and the stator assembly includes a stator core, wherein the shell components are assembled to form a accommodating cavity, and the stator core is located in the accommodating cavity. One or more hollow areas are respectively formed on the two shell components, and the hollow areas connect the accommodating cavity with the outside world. At least one of the shell components is used to connect an impeller.

2. The outer rotor motor according to claim 1, characterized in that: One or more hollow areas and a shaft connecting hole are formed on the stator core, and the motor shaft is fixedly connected to the shaft connecting hole.

3. The outer rotor motor according to claim 2, characterized in that: In a projection along the axial direction of the motor shaft, the hollow area of ​​the stator core and the hollow area of ​​the housing component at least partially overlap.

4. The outer rotor motor according to claim 2, characterized in that: The stator core includes a yoke, wherein in a radial direction relative to the center of the stator core, an inward extension of a boundary of a hollow area of ​​the stator core does not touch the shaft connecting hole, and an outward extension of a boundary of the hollow area does not exceed an inner boundary of the yoke.

5. The outer rotor motor according to claim 1, characterized in that: A bearing mounting seat is provided on the shell component, and the bearing mounting seat is used to accommodate a bearing connected to the motor shaft, wherein in a radial direction relative to the center of the shell component, the inward extension of the boundary of the hollow area of ​​the shell component does not exceed the outer boundary of the bearing mounting seat.

6. The outer rotor motor according to claim 1, characterized in that: The stator core is provided with stator slots, wherein in a radial direction relative to the center of the shell component, the outward extension of the boundary of the hollow region of the shell component does not exceed the bottom of the stator slot.

7. The outer rotor motor according to any one of claims 1 to 6, characterized in that: The shell component comprises a central accommodating area and an annular installation area formed on the periphery. The two shell components are fixedly connected together via the installation area. The two accommodating areas enclose the accommodating cavity.

8. A fan, comprising a volute and an impeller, characterized in that: The fan further comprises a mounting bracket and an outer rotor motor as claimed in any one of claims 1 to 7, wherein the mounting bracket is connected to the impeller and the housing component respectively, and the motor shaft is fixed relative to the volute.

9. The fan according to claim 8, characterized in that: The mounting bracket is formed integrally with the impeller or the housing component, and / or a hollow area is provided on the mounting bracket.

10. A range hood, characterized in that: The range hood comprises an outer rotor motor as described in any one of claims 1-7.

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