Fan and range hood comprising same

Abstract

The fan comprises a motor, an impeller and a shell which are sequentially arranged from inside to outside, the motor comprises a rotating shaft, a stator and a rotor which are sequentially arranged from inside to outside, the impeller comprises an impeller body and a first impeller middle disc, and the first impeller middle disc is fixedly connected with the impeller body on one side face of the impeller body; one axial end of the rotating shaft is inserted into the first impeller middle disc, and the other axial end of the rotating shaft is rotatably connected with an end cover of the volute; the rotating shaft is rotatably connected with the stator; the rotor comprises rotor magnetic steel and a rotor yoke arranged on the outer side of the rotor magnetic steel in a sleeving mode, the rotor yoke and the first impeller middle disc are integrally formed, and the rotor magnetic steel is fixedly connected with the rotor yoke. According to the draught fan and the range hood comprising the draught fan, the motor and the impeller are connected without installation holes or fasteners such as screws and pins, the connecting structure is simplified, the connecting and assembling steps are omitted, and therefore the assembling efficiency is improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fan, especially a fan and a range hood comprising the same. BACKGROUND

[0002] In the fan structure of the range hood and other household electrical appliances, the traditional main drive motor mostly adopts a three-phase brushless DC motor or an alternating current induction motor, and the assembly mode of the motor and the impeller and volute (or other shaped shell) is as follows: the motor shell is usually provided with mounting holes, the mounting holes on the motor shell are connected with the threaded holes provided on the volute support by fastening screws to realize the connection between the motor and the volute; at the same time, the front end of the motor shaft is usually designed with external threads and pin holes, the pin is matched with the pin holes on the shaft, and the pin is also matched with the inner hole groove of the impeller, serving as the circumferential limiting action; after the shaft and the inner hole of the impeller are matched, the impeller is locked by the fastening nut matched with the threaded end of the motor shaft.

[0003] As can be seen from such a structure, the motor and the impeller and volute need to be connected and assembled by additional screws, pins, pin holes, nuts and external threads, and the assembly mode is complex and tedious, and in the case of multiple connecting parts, the connection reliability will be reduced, which also affects the assembly efficiency. In addition, the existing motor coil and magnetic steel have poor heat dissipation, especially for the three-phase permanent magnet brushless DC motor, the magnetic steel will demagnetize under the action of high temperature current when the motor works for a long time. SUMMARY

[0004] The utility model wants to solve the technical problem that the assembly structure of the component parts of the fan in the prior art is complex and the assembly efficiency is poor, and provides a fan and a range hood comprising the same.

[0005] The utility model solves the above technical problem by the following technical scheme:

[0006] A fan, the fan comprising a motor, an impeller and a shell arranged in sequence from inside to outside, the motor comprising a shaft, a stator and a rotor arranged in sequence from inside to outside, the impeller comprising an impeller body and a first impeller center disc, the first impeller center disc being arranged on one side of the impeller body along the axial direction of the impeller body and fixedly connected with the impeller body, one end of the shaft along the axial direction being inserted into the first impeller center disc, and the end of the shaft being interference-fitted with the insertion hole of the first impeller center disc, the other end of the shaft along the axial direction being rotatably connected with the end cover of the volute, the shaft being rotatably connected with the stator, the rotor comprising rotor magnetic steel and a rotor yoke sleeved outside the rotor magnetic steel, the rotor yoke being integrally formed with the first impeller center disc, and the rotor magnetic steel being fixedly connected with the rotor yoke.

[0007] In the scheme, the fan is integrally formed with the first impeller middle disc through the rotor yoke, and the rotor magnet steel is fixedly connected with the rotor yoke, so that the motor and the impeller are connected at the outer side of the motor; one end of the rotating shaft is inserted into the first impeller middle disc, and the end of the rotating shaft is in interference fit with the insertion hole of the first impeller middle disc, so that the motor and the impeller are connected at the center of the motor; in such a connection structure, no mounting hole needs to be formed on the motor and the impeller, and no fastener such as a screw or a pin is needed, so that the connection structure is simplified, the connection and assembly steps are saved, the assembly efficiency is improved, and the cost is reduced. In the motor structure, the rotor and the rotating shaft are rotating motion components, the rotating shaft and the rotor drive the first impeller middle disc and the impeller body to rotate synchronously at the center and the outer side of the motor respectively through the above structure, and the other end of the rotating shaft is rotatably connected with the end cover of the fan shell, so that the fan shell can remain stationary, and the rotating shaft is rotatably connected with the stator, so that the stator can remain stationary, thereby realizing the cooperation between the rotating motion components and the stationary components.

[0008] Preferably, the impeller further comprises a second impeller middle disc arranged on the side of the impeller body relative to the first impeller middle disc, one end of the rotating shaft is rotatably connected with the second impeller middle disc, and the second impeller middle disc is fixedly connected with the end cover of the shell.

[0009] In the scheme, the rotating shaft and the end cover of the shell are rotatably connected through the second impeller middle disc, so that the end cover of the fan shell can be simplified, and the manufacturing difficulty is reduced.

[0010] Preferably, the rotating shaft and the second impeller middle disc are connected through a bearing, and / or the rotating shaft and the stator are connected through a bearing.

[0011] In the scheme, the rotating shaft and the second impeller middle disc and / or the rotating shaft and the stator are rotatably connected through the bearing, and the rotating mode is more flexible, which is beneficial to reduce the rotating resistance and noise.

[0012] Preferably, the stator and the second impeller middle disc are spaced apart along the axial direction.

[0013] In the scheme, the stator does not contact the second impeller middle disc, so that no friction is generated between the two, which is beneficial to improve the working efficiency of the fan.

[0014] Preferably, a circlip is attached to the rotating shaft at the end face of the stator relative to the second impeller middle disc, and / or a circlip is attached to the rotating shaft at the end face of the second impeller middle disc relative to the stator.

[0015] In the scheme, the position of the stator is limited by the clamping spring, so that the stator cannot move axially to the second impeller disc to generate frictional resistance, and / or the position of the second impeller disc and the connecting structure between the second impeller disc and the end of the rotating shaft is limited, so that the second impeller disc cannot move axially to the stator to generate frictional resistance; thereby ensuring that there is enough space between the stator and the second impeller disc.

[0016] Preferably, the rotor magnet is in interference fit with the rotor yoke in the radial direction of the rotor magnet; or the rotor magnet and the rotor yoke are fixedly connected by glue.

[0017] In the scheme, the rotor magnet and the rotor yoke are fixedly connected in the radial direction by interference fit or glue bonding, which ensures that the rotor magnet can drive the rotor yoke to rotate synchronously, thereby driving the impeller to rotate synchronously.

[0018] Preferably, a plurality of through holes are formed in the circumferential direction of the first impeller disc at the region of the first impeller disc relative to the motor.

[0019] In the scheme, the first impeller disc forms a hollow structure at the region of the first impeller disc relative to the motor, and the hollow structure is opposite to the motor, so that the external airflow enters the hollow structure to effectively cool the motor.

[0020] Preferably, a plurality of through holes are formed in the circumferential direction of the first impeller disc at the region of the first impeller disc relative to the motor.

[0021] In the scheme, a plurality of through holes are formed in the first impeller disc and the second impeller disc at the region of the first impeller disc and the second impeller disc relative to the motor, so that the first impeller disc and the second impeller disc have hollow structures opposite to the motor, and the external airflow enters the hollow structures to cool the motor, thereby further increasing the cooling airflow for heat dissipation and improving the heat dissipation effect.

[0022] Preferably, the motor is a single-phase brushless motor.

[0023] In the scheme, the motor of the fan is a single-phase brushless motor, which is easier to realize the simplified connection structure.

[0024] An oil smoke exhaust fan, comprising the fan as described above.

[0025] In the scheme, the oil smoke exhaust fan realizes the connection without mounting holes and the connection without fasteners such as screws and pins between the motor and the impeller by the fan, thereby simplifying the connection structure, saving the connection and assembly steps, improving the assembly efficiency, and reducing the cost.

[0026] The positive progress effect of the utility model lies in: the fan and the range hood comprising same realize no installation hole connection, no screw, pin and other fastener connection between the motor and the impeller, simplify the connection structure, save the connection assembly steps, thereby improving the assembly efficiency and reducing the cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a three-dimensional structure schematic view of the fan of the utility model embodiment 1.

[0028] Figure 2 It is a front view of the fan structure of the utility model embodiment 1.

[0029] Figure 3 It is a half sectional view of the fan structure of the utility model embodiment 1.

[0030] Figure 4 It is Figure 3 It is a structure enlarged schematic view of partial C.

[0031] Figure 5 It is a structure schematic view of the first impeller middle disc and the rotor yoke integrally formed after the utility model embodiment 1.

[0032] Figure 6 It is a structure schematic view of the second impeller middle disc of the utility model embodiment 1.

[0033] Figure 7 It is an internal structure schematic view of the fan of the utility model embodiment 1 after removing the shell.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] Fan 1

[0036] Motor 2

[0037] Shaft 21

[0038] Stator 22

[0039] Rotor 23

[0040] Rotor magnetic steel 231

[0041] Rotor yoke 232

[0042] Impeller 3

[0043] Impeller body 31

[0044] First impeller middle disc 32

[0045] First impeller middle disc protruding structure 321

[0046] Plug-in hole 322

[0047] Through hole 323

[0048] Second impeller, middle disc 33

[0049] The protruding structure of the second impeller disk 331

[0050] 4 housings

[0051] End cap 41

[0052] Bearing 5

[0053] Snap ring 6

[0054] Axial A

[0055] Radial B Detailed Implementation

[0056] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0057] Example 1

[0058] This embodiment provides a fan 1, which is installed in a range hood to extract and exhaust cooking fumes.

[0059] like Figures 1-7 As shown, the fan 1 includes a motor 2, an impeller 3, and a housing 4 arranged sequentially from the inside out. The motor 2 includes a rotating shaft 21, a stator 22, and a rotor 23 arranged sequentially from the inside out. The impeller 3 includes an impeller body 31 and a first impeller disk 32. The first impeller disk 32 is located on one side of the impeller body 31 along the axial direction A and is fixedly connected to the impeller body 31. One end of the rotating shaft 21 along the axial direction A is inserted into the first impeller disk 32, and the end of the rotating shaft 21 is press-fitted with the insertion hole 322 of the first impeller disk 32. The other end of the rotating shaft 21 along the axial direction A is rotatably connected to the end cover 41 of the housing 4. The rotating shaft 21 is rotatably connected to the stator 22. The rotor 23 includes a rotor magnet 231 and a rotor yoke 232 sleeved on the outside of the rotor magnet 231. The rotor yoke 232 is integrally formed with the first impeller disk 32, and the rotor magnet 231 is fixedly connected to the rotor yoke 232.

[0060] Specifically, in this embodiment, the casing 4 of the fan 1 is a snail-shell shaped metal casing 4, referred to as a volute. An annular impeller 3 is installed inside the volute. The impeller 3 includes an impeller body 31, a first impeller disc 32, and a second impeller disc 33. The impeller body 31 has several blades installed along its circumference. Both impeller discs 3 are disc-shaped metal supports. The first impeller disc 32 is located on... Figure 4The outer side of the right side surface of the impeller body 31 is fixedly connected with the impeller body 31 by riveting or other means. The central region of the first impeller disc 32 is recessed inward to be close to the motor 2. A conical protruding structure 321 is arranged at the central region of the first impeller disc 32 and opposite to the position of the rotating shaft 21. The protruding structure 321 is provided with a plug-in hole 322 for the one end of the rotating shaft 21. The second impeller disc 33 is arranged at the side surface of the impeller body 31 relative to the first impeller disc 32 (i.e. at the left side surface of the impeller body 31). The second impeller disc 33 serves as an intermediate connection and is fixedly connected with the end cover 41 of the fan 1 housing 4 at the outer side in the circumferential direction. A conical protruding structure 331 is arranged at the central position of the second impeller disc 33. The protruding structure 331 is provided with a bearing 5, which is rotatably connected with the one end of the rotating shaft 21 of the motor 2.

[0061] In the embodiment, the motor 2 is a single-phase brushless motor 2. The rotating shaft 21 is a metal shaft. The one end of the rotating shaft 21 is inserted into the plug-in hole 322 at the central position of the first impeller disc 32 and is in interference fit with the plug-in hole 322, so as to firmly connect the rotating shaft 21 with the first impeller disc 32. The other end of the rotating shaft 21 is rotatably connected with the second impeller disc 33 through the bearing 5. The rotating shaft 21 is rotatably connected with the stator 22 through the other two bearings 5 arranged at the two ends of the stator 22 in the axial direction A. The rotor yoke 232 of the motor 2 is a circular ring-shaped metal piece. The rotor yoke 232 is integrally formed with the first impeller disc 32 to form an integral whole. The rotor magnet steel 231 and the rotor yoke 232 are fixedly connected by strong glue or other means.

[0062] In other embodiments, the shape and structure of the housing 4 of the fan 1 can be adjusted according to different application occasions, and it is not limited to a certain shape of a volute. Therefore, the fan 1 made by using the technical principle of the embodiment can also be used in electrical appliances other than the range hood according to the application needs. In other embodiments, the fan 1 can also be without the second impeller disc 33. Instead, the end cover 41 of the fan 1 housing 4 is made large, and the end cover 41 is directly rotatably connected with the rotating shaft 21 of the motor 2. The rotatable connection can also have various forms, and is not limited to the bearing 5.

[0063] In the fan 1 structure, the fan 1 is integrally formed with the first impeller middle disc 32 through the rotor yoke 232, and the rotor magnet steel 231 is fixedly connected with the rotor yoke 232, so that the motor 2 and the impeller 3 are connected at the outer side of the motor 2; the motor 2 and the impeller 3 are connected at the central position of the motor 2 through the one end of the rotating shaft 21 and the plug-in connection of the rotating shaft 21 and the plug-in hole 322 of the first impeller middle disc 32; in the connection structure, no mounting hole needs to be formed on the motor 2 and the impeller 3, and no fastener such as a screw and a pin is needed, so that the connection structure is simplified, the connection and assembly steps are saved, the assembly efficiency is improved, and the cost is reduced. In the motor 2 structure, the rotor 23 and the rotating shaft 21 are rotating motion components, the fan 1 is provided with the above structure, the rotating shaft 21 and the rotor 23 drive the first impeller middle disc 32 and the impeller body 31 to rotate synchronously at the center and the outer side of the motor 2 respectively, the other end of the rotating shaft 21 is rotatably connected with the end cover 41 of the fan 1 shell 4, so that the fan 1 shell 4 can be kept stationary, and the rotating shaft 21 is rotatably connected with the stator 22, so that the stator 22 can be kept stationary, thereby realizing the cooperation between the rotating motion components and the stationary components.

[0064] As described above, the connection between the rotating shaft 21 and the end cover 41 of the shell 4 can be that the end cover 41 is enlarged and directly connected with the rotating shaft 21, or the connection is realized through the second impeller middle disc 33. Compared with the direct connection mode, the rotating shaft 21 and the end cover 41 of the embodiment are rotatably connected through the second impeller middle disc 33, so that the end cover 41 of the fan 1 shell 4 can be simplified, and the manufacturing difficulty is reduced.

[0065] In the embodiment, the rotating shaft 21 and the second impeller middle disc 33 are connected through the bearing 5, and the rotating shaft 21 and the stator 22 are connected through two bearings 5. By using the rotatable structure characteristics of the bearing 5, the rotating shaft 21 and the second impeller middle disc 33 and / or the rotating shaft 21 and the stator 22 are rotatably connected, and the rotating mode is more flexible, which is beneficial to reducing the rotating resistance and noise. In other embodiments, other connection modes can be used to realize the rotatable connection according to the needs; the number and specific positions of the bearings 5 can also be adjusted according to the actual structure needs, for example, if the stator 22 is not large and the bearing 5 is large, only one bearing 5 can be arranged between the rotating shaft 21 and the stator 22 to realize the rotatable connection. However, the embodiment arranges the bearings 5 at both ends of the stator 22 along the axial direction A, which can enhance the connection stability between the rotating shaft 21 and the stator 22, and the rotation is more stable, which is beneficial to reducing the noise.

[0066] As shown in FIG. 1, Figure 4 The stator 22 and the second impeller middle disc 33 are arranged along the axial direction A, so that the stator 22 does not contact the second impeller middle disc 33, the friction therebetween is avoided, and the working efficiency of the fan 1 is improved.

[0067] Specifically, the shaft 21 is provided with a snap spring 6 at the end face of the stator 22 relative to the second impeller disc 33; the shaft 21 is provided with a snap spring 6 at the end face of the second impeller disc 33 relative to the stator 22. By providing two snap springs 6, the position of the stator 22 is limited so that it cannot move axially A to the second impeller disc 33 to generate frictional resistance there, and at the same time the position of the second impeller disc 33 and its connecting structure with the end of the shaft 21 is limited so that it cannot move axially A to the stator 22 to generate frictional resistance there; thereby ensuring that there is enough spacing between the two (stator 22 and second impeller disc 33). In other embodiments, other structures or components can be used to space the stator 22 and the second impeller disc 33.

[0068] In this embodiment, the rotor magnet steel 231 and the rotor yoke 232 are fixedly connected by glue, and the glue can be a glue with high bonding strength and good stability to achieve stable and reliable connection. However, there are many ways to achieve fixed connection, for example, in other embodiments, the rotor magnet steel 231 and the rotor yoke 232 can also be fixedly connected by radial interference fit. Whether it is interference fit or glue bonding, both can achieve fixed connection between the two (rotor magnet steel 231 and rotor yoke 232), ensuring that the rotor magnet steel 231 can drive the rotor yoke 232 to rotate synchronously, thereby driving the impeller 3 to rotate synchronously.

[0069] As shown in Figure 1 and Figure 5 As shown in Figs. 1 and 2, the first impeller disc 32 is provided with a plurality of through holes 323 or slots along the circumferential direction of the first impeller disc 32 at the region of the first impeller disc 32 relative to the motor 2, so that the first impeller disc 32 forms a hollow structure or a structure like a fan blade at the region of the first impeller disc 32 relative to the motor 2. The hollow structure is directly opposite the motor 2, so that external airflow enters from the hollow structure and can effectively cool the motor 2.

[0070] In other embodiments, according to needs, a plurality of through holes 323 can also be provided along the circumferential direction of the first impeller disc 32 at the region of the first impeller disc 32 and the second impeller disc 33 relative to the motor 2, so that both the first impeller disc 32 and the second impeller disc 33 have hollow structures directly opposite the motor 2. External airflow can enter from different hollow structures to cool the motor 2, further increasing the cooling airflow for cooling and improving the cooling effect. In other embodiments, if the fan 1 does not have the second impeller disc 33, but the end cover 41 is enlarged to replace the second impeller disc 33 of this embodiment, the end cover 41 can also be provided with through holes 323 or slots at the region of the end cover 41 relative to the motor 2 to achieve the effect of cooling.

[0071] In addition, in order to better dissipate heat and gas flow, the first impeller disc 32 and the second impeller disc 33 in the area of the motor 2 (i.e. Figure 1 , Figure 5 and Figure 6 Figure 7 the first impeller disc 32 and the second impeller disc 33 are close to the impeller body 31) are also provided with a hollow structure with a larger area, which reduces the weight and processing cost while dissipating heat.

[0072] As described above, the motor 2 used in the embodiment is a single-phase brushless motor 2, which is easier to realize the simplified connection structure described above. However, according to different application occasions and needs, other types of motors 2 with the structural features of the motor 2 described above can also be used in other embodiments, without being limited to the single-phase brushless motor 2.

[0073] Embodiment 2

[0074] The oil smoke machine provided in the embodiment includes the fan 1 as in Embodiment 1. The oil smoke machine realizes the hole-free connection between the motor 2 and the impeller 3 through the fan 1 as in Embodiment 1, and realizes the screw-free, pin-free fastener connection, simplifies the connection structure, saves the connection and assembly steps, thereby improving the assembly efficiency and reducing the cost.

[0075] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A fan, comprising a motor, an impeller and a housing arranged in sequence from inside to outside, the motor comprising a rotating shaft, a stator and a rotor arranged in sequence from inside to outside, characterized in that, the impeller comprises an impeller body and a first impeller middle disc arranged on one side of the impeller body along an axial direction of the impeller body and fixedly connected with the impeller body; one end of the rotating shaft along the axial direction is inserted into the first impeller middle disc, and the end of the rotating shaft is in interference fit with the insertion hole of the first impeller middle disc, and the other end of the rotating shaft along the axial direction is rotatably connected with an end cover of the housing; the rotating shaft is rotatably connected with the stator; the rotor comprises a rotor magnet and a rotor yoke sleeved outside the rotor magnet, the rotor yoke is integrally formed with the first impeller middle disc, and the rotor magnet is fixedly connected with the rotor yoke.

2. The fan of claim 1, wherein the impeller further comprises a second impeller middle disc arranged on the side of the impeller body opposite to the first impeller middle disc, one end of the rotating shaft is rotatably connected with the second impeller middle disc, and the second impeller middle disc is fixedly connected with the end cover of the housing.

3. The fan of claim 2, wherein the rotating shaft and the second impeller middle disc are connected through a bearing, and / or the rotating shaft and the stator are connected through a bearing.

4. The fan of claim 2, wherein the stator and the second impeller middle disc are spaced apart along the axial direction.

5. The fan of claim 4, wherein a circlip is attached to the rotating shaft at the end surface of the stator relative to the second impeller middle disc; and / or a circlip is attached to the rotating shaft at the end surface of the second impeller middle disc relative to the stator.

6. The fan of claim 1, wherein the rotor magnet is in interference fit with the rotor yoke along the radial direction of the rotor magnet; or the rotor magnet and the rotor yoke are fixedly connected through glue.

7. The fan of claim 1, wherein a plurality of through holes are formed in the first impeller middle disc along the circumferential direction of the first impeller middle disc at the region of the first impeller middle disc relative to the motor.

8. The fan of claim 2, wherein a plurality of through holes are formed in the first impeller middle disc and the second impeller middle disc along the circumferential direction of the first impeller middle disc at the region of the first impeller middle disc and the second impeller middle disc relative to the motor.

9. The fan of any one of claims 1-8, wherein, the motor is a single-phase brushless motor.

10. A range hood characterized by the range hood comprises the fan according to any one of claims 1-9.

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