Impeller and fan with same

Abstract

The utility model relates to an impeller (2) and a fan with the impeller. The impeller comprises a main body (3) and at least one blade, the main body (3) comprises a bottom wall (4) and a side wall (5), and the bottom wall (4) comprises a boss (8) protruding away from the bottom wall (4) in the axial direction (x), in particular approximately in the middle position. The bottom wall (4) comprises, on the same side as the boss (8), at least one projection (14) which is spaced apart from the boss (8) in the radial direction (y) and protrudes from the bottom wall (4) in the axial direction (x) in a manner facing away from the bottom wall (4). According to the technical scheme, the structural strength of the impeller is improved, the noise risk is eliminated, and the impeller is convenient to disassemble and assemble.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of impeller and a fan with the impeller. BACKGROUND

[0002] In the current fan, the magnet of motor is fixed on impeller by press fitting yoke ring, wherein there is gap between impeller and support, so that impeller can be displaced in axial direction, and then cause the risk of contact friction and noise between boss surface inside impeller and top of support in working state.

[0003] The above technical problems have not been considered in impeller and fan with the impeller so far, so these technical problems have not been solved so far. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide an improved impeller and fan with the impeller.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, the utility model provides an impeller, especially an impeller for fan, preferably an impeller for fan of household appliance, which comprises a main body and at least one blade, wherein the main body comprises a bottom wall and a side wall, wherein the bottom wall especially comprises a boss protruding away from the bottom wall in axial direction substantially at middle position. The utility model proposes that the bottom wall comprises at least one protrusion on the same side of the boss, which is spaced apart from the boss in radial direction and protrudes from the bottom wall in axial direction away from the bottom wall. The technical advantage achieved thereby is that the structural strength is improved by adding protrusion to the bottom wall of impeller. In addition, when the impeller is installed on the fan, the protrusion forms a limiting structure, thereby eliminating or at least reducing the risk of generating friction noise.

[0006] One advantageous development of the utility model of impeller is characterized in that the protrusion can comprise groove on radial outer side, so that the upper end of the protrusion preferably has substantially inverted L shape in cross section, wherein the L shape preferably comprises first part and second part protruding outward in radial direction from upper end of the first part. An advantageous stepped structure is achieved thereby.

[0007] One advantageous development of the utility model of impeller is characterized in that the protrusion can be connected with the bottom wall, especially connected in material cooperation, especially connected integrally, especially molded on the bottom wall, wherein the protrusion is especially composed of the same material as the bottom wall, especially composed of plastic.

[0008] The other advantageous development scheme of the impeller is characterized in that the bottom wall can comprise a first bottom wall area and a second bottom wall area arranged outside the first bottom wall area in a radial direction and above the first bottom wall area in an axial direction, and the first bottom wall area and the second bottom wall area are connected to each other by the protruding part, in particular integrally connected.

[0009] The advantage achieved thereby is that the protruding part can be manufactured particularly simply and conveniently and at low cost, and structural optimization is achieved.

[0010] The other advantageous development scheme of the impeller is characterized in that the bottom wall can comprise a first bottom wall area and a second bottom wall area arranged outside the first bottom wall area in a radial direction and above the first bottom wall area in an axial direction, and the first bottom wall area and the second bottom wall area are connected to each other by the protruding part, in particular integrally connected.

[0011] The other advantageous development scheme of the impeller is characterized in that the bottom wall can comprise a first bottom wall area and a second bottom wall area arranged outside the first bottom wall area in a radial direction and above the first bottom wall area in an axial direction, and the first bottom wall area and the second bottom wall area are connected to each other by the protruding part, in particular integrally connected.

[0012] The other advantageous development scheme of the impeller is characterized in that the bottom wall can comprise a first bottom wall area and a second bottom wall area arranged outside the first bottom wall area in a radial direction and above the first bottom wall area in an axial direction, and the first bottom wall area and the second bottom wall area are connected to each other by the protruding part, in particular integrally connected.

[0013] In addition, according to another aspect of the utility model, the purpose of the utility model is also solved by a fan, the fan is preferably used for household appliance, it includes motor and above described impeller. Therefore, provide a fan that eliminates or at least reduces noise risk. Specifically, by adding protruding part to impeller bottom wall, to form limiting structure, avoid the noise problem caused by the displacement of impeller in axial direction and the contact friction between impeller and support.

[0014] The other advantageous development scheme of the impeller is characterized in that the bottom wall can comprise a first bottom wall area and a second bottom wall area arranged outside the first bottom wall area in a radial direction and above the first bottom wall area in an axial direction, and the first bottom wall area and the second bottom wall area are connected to each other by the protruding part, in particular integrally connected.

[0015] An advantageous development of the fan according to the application is characterized in that the magnet yoke can comprise a second magnet yoke section, the protrusion and the second magnet yoke section being spaced apart from each other in the radial direction, thereby forming a second gap. This makes it easier to demold and to deburr after demolding.

[0016] An advantageous development of the fan according to the application is characterized in that the motor can comprise a stator insulation support, the stator insulation support and the protrusion being spaced apart from each other in the radial direction, thereby forming a first gap. This makes it possible to provide a sufficient safety distance between the stator insulation support and the protrusion, so that they do not interfere with each other.

[0017] An advantageous development of the fan according to the application is characterized in that the motor can comprise a magnet arranged in the magnet yoke, the magnet and the protrusion being spaced apart from each other in the axial direction, thereby forming a third gap. This makes it possible to avoid fluctuations in the installation of the product pressing against the magnet and affecting the performance of the product. Furthermore, the third gap is designed such that, even in the case of axial displacement of the impeller caused by movement of the magnet, there is a sufficient gap between the support and the impeller, in particular between the top of the support and the boss surface inside the impeller, so that the support and the impeller do not come into contact and produce frictional noise.

[0018] The various embodiments of the application listed above can also be used in combination with each other, even if this is not explicitly stated herein, provided that this is technically possible. The preferred technical solution of the impeller according to the application corresponds to the preferred technical solution of the fan according to the application, and vice versa, even if this is not explicitly stated herein. BRIEF DESCRIPTION OF DRAWINGS

[0019] The embodiments of the application will be explained in more detail below with reference to the accompanying drawings. In the drawings:

[0020] Figure 1 a cross-sectional view of a fan according to the prior art is shown;

[0021] Figure 2 a cross-sectional view of an impeller according to the prior art is shown;

[0022] Figure 3 a cross-sectional view of Figure 1 part A is shown;

[0023] Figure 4 a cross-sectional view of an impeller according to the prior art is shown;

[0024] Figure 5 a cross-sectional view of an impeller according to the application is shown;

[0025] Figure 6 a cross-sectional view of a fan according to the application is shown;

[0026] Figure 7 Fig. 3 shows a further partial cross-sectional view of a fan according to the utility model; DETAILED DESCRIPTION

[0027] Figure 1 Fig. 1 shows a cross-sectional view of a fan 1 according to the prior art; Figure 2 Fig. 2 shows an impeller 2 according to the prior art, which is mounted in the fan 1 shown in Fig. 1; Figure 1 Fig. 3 shows a cross-sectional view of a partial A in the fan 1 shown in Fig. 1; Figure 3 Fig. 4 shows a cross-sectional view of a partial B in the fan 1 shown in Fig. 1; Figure 1 Fig. 5 shows a cross-sectional view of a partial C in the fan 1 shown in Fig. 1. The fan 1 comprises a holder 7, an impeller 2 and a motor; the impeller 2 comprises a main body 3 and at least one blade, wherein the main body 3 comprises a bottom wall 4 and a side wall 5, which form a receiving space 6 in which a stator 23, a magnet 10, a magnet yoke 11, etc. of the motor are received, wherein the magnet 10 of the motor is fixed on the impeller 2 by means of a press-fitting magnet yoke 11. The bottom wall 4 comprises substantially in the middle a first boss 8 projecting in the cross-sectional view in axial direction x away from the bottom wall 4. In the first boss 8 a hole is formed in which a motor shaft 22 of the motor is supported. Optionally, the bottom wall 4 can also comprise substantially in the middle a second boss 24 projecting in the cross-sectional view in axial direction x away from the bottom wall 4, which is open at one end and closed at the other end, thereby forming a blind hole therein. In this case, the hole and the blind hole are aligned in axial direction X, in which the motor shaft 22 of the motor is supported.

[0028] Figure 3 Fig. 3 shows the assembly state of the holder 7 and the impeller 2. It can be seen from the cross-sectional view that the holder 7 is formed with an opening 18 at the lower end. In the assembled state, the first boss 8 of the impeller 2 partially extends into the opening 18, wherein there is a gap 21 in axial direction x between the first boss 8 and the holder 7. It can also be seen from Fig. 3 that the magnet 10, the magnet yoke 11 and the stator insulation holder 9 of the motor are shown, the magnet yoke 11 is preferably formed as a magnet yoke ring, which is fixed on the impeller 2, wherein the magnet 10 is fixed on the impeller 2 by means of a press-fitting of the magnet yoke ring. Figure 3

[0029] Figure 4 ​A further enlarged sectional view shows the partial section A. Shown in this sectional view is a state in which the first lobe 8 inside the impeller is in contact with the bracket 7, in which state the surface of the first lobe 8 comes into contact 13 with the surface of the bracket 7, thereby generating noise during operation. The cause of this state is that the impeller experiences a change in the magnetic field force, which causes it to be displaced axially towards the shaft. Specifically, during operation of the impeller, the magnet can be displaced, which causes the impeller to experience a change in the magnetic field force, which in turn causes the impeller to be displaced axially and to come into contact with the bracket, thereby generating noise. In addition, during assembly of the magnet, the magnet is not assembled in the intended position, and when the magnet is close to the bottom of the yoke ring, this likewise causes the impeller to experience a change in the magnetic field force during operation, which in turn causes the impeller to be displaced axially and to come into contact with the bracket, thereby generating noise.

[0030] Against the background of the prior art and the technical problem identified by the applicant, the applicant has improved the impeller by adding a protrusion, in particular a petal-like step, to the impeller to increase the structural strength. The fan with this impeller also prevents the bracket from rubbing against the impeller, in particular the first lobe of the impeller, to generate noise. Specifically, the protrusion forms a limiting structure that abuts against the magnet when the magnet is displaced or offset, thereby preventing the impeller from being displaced axially so that the impeller comes into contact with the bracket to rub against it and generate noise.

[0031] Specifically, Figure 5 An embodiment of an impeller according to the application is shown. In Figure 5 In the embodiment shown, four protrusions 14 are provided, which are preferably spaced apart from one another and arranged at equal distances from one another, thereby preferably forming a petal-like structure. In other embodiments, the number of protrusions 14 can differ from four, for example, two, three, five or six can be provided.

[0032] Figure 6 And Figure 7 A partial sectional view of an impeller according to one embodiment of the application is shown. From Figure 6 And Figure 7 It can be seen that the protrusions 14 are provided on the bottom wall 4 of the impeller 2, wherein the protrusions are spaced apart from the first lobe 8 in the radial direction y and protrude from the bottom wall 4 in the axial direction x in such a way that they face away from the bottom wall 4. The wall thickness of the protrusions 14 is substantially equal to the wall thickness of the main body 3 of the impeller 2, in particular substantially equal to the wall thickness of the bottom wall 4 of the impeller 2 or of the blades of the impeller 2.

[0033] In one embodiment, the protrusions 14 are connected to the bottom wall 4 of the impeller 2, in particular materially connected, in particular integrally connected, in particular molded on the bottom wall 4, wherein the protrusions 14 are in particular composed of the same material as the bottom wall 4, in particular composed of plastic.

[0034] In one embodiment, the bottom wall 4 may include a first bottom wall region 19 and a second bottom wall region 20 arranged radially y outside the first bottom wall region 19 and axially x above the first bottom wall region 19, the first bottom wall region 19 and the second bottom wall region 20 being interconnected, particularly integrally connected, by the protrusion 14.

[0035] In one embodiment, the protrusion 14 includes a groove 17 on its radially outer side, the bottom surface of which is preferably flush with the surface of the second bottom wall region 20 of the bottom wall 4. The groove 17 preferably results in the upper portion of the protrusion 14 having a substantially inverted L-shape in cross-section, wherein the L-shape preferably includes a first portion 15 and a second portion 16 projecting radially y from the upper end of the first portion 15.

[0036] In one embodiment, the yoke 11 of the motor is fitted into the groove 17, and the yoke 11 can be fixedly connected to the side wall 5 of the impeller 2. The yoke 11 includes a first yoke section 12, which is at least partially fitted into the groove 17 in a form-fit manner along the radial y direction.

[0037] In one embodiment, the magnetic yoke 11 may further include a second magnetic yoke segment 12', which is spaced apart from the protrusion 14 along the radial direction y, thereby forming a second gap b (see...). Figure 7 ).

[0038] In one embodiment, the stator insulation bracket 9 of the motor and the protrusion 14 are spaced apart from each other radially y, thereby forming a first gap a (see...). Figure 7 ).

[0039] In one embodiment, the magnet 10 disposed on the yoke 11 and the protrusion 14 are spaced apart from each other along the axial direction x, thereby forming a third gap c (see Figure 7 The design of this third gap should ensure that even if the magnet moves and causes axial displacement of the impeller, there is sufficient clearance between the support and the impeller, especially between the top of the support and the boss surface inside the impeller, so as to avoid friction noise caused by contact between the support and the impeller.

[0040] The technical solutions of the various embodiments of this utility model improve the structural strength of the impeller. Furthermore, when the impeller is installed in a fan, the risk of noise generation due to friction between the internal bosses of the impeller and the fan bracket is avoided. In addition, the impeller is easy to manufacture and will not be damaged during installation and disassembly.

[0041] List of reference numerals

[0042] 1 fan

[0043] 2 impeller

[0044] 3 impeller disc

[0045] 4 bottom wall

[0046] 5 side wall

[0047] 6 accommodation space

[0048] 7 bracket

[0049] 8 first boss

[0050] 9 stator insulation bracket

[0051] 10 magnet

[0052] 11 magnetic yoke

[0053] 12 first magnetic yoke section of the magnetic yoke

[0054] 12' second magnetic yoke section of the magnetic yoke

[0055] 13 contact

[0056] 14 protrusion

[0057] 15 first portion of the protrusion

[0058] 16 second portion of the protrusion

[0059] 17 recess

[0060] 18 opening (of the lower end of the bracket)

[0061] 19 first region of the bottom wall

[0062] 20 second region of the bottom wall

[0063] 21 gap (between the first boss and the bracket)

[0064] 22 motor shaft

[0065] 23 stator

[0066] 24 second boss

[0067] x axial

[0068] y radial

[0069] a first gap

[0070] b second gap

[0071] c third gap

Claims

1. Impeller (2), in particular for a fan, preferably for a fan of a household appliance, comprising a body (3) and at least one blade, wherein the body (3) comprises a bottom wall (4) and a side wall (5), wherein the bottom wall (4) comprises, in particular substantially in the middle, a boss (8) projecting away from the bottom wall (4) in axial direction (x), characterized in that the bottom wall (4) comprises, on the same side as the boss (8), at least one protrusion (14) which is spaced apart from the boss (8) in radial direction (y) and projects away from the bottom wall (4) in axial direction (x).

2. Impeller (2) according to claim 1, characterized in that the protrusion (14) comprises a recess (17) on the radially outer side.

3. Impeller (2) according to claim 1 or 2, characterized in that the protrusion (14) is connected to the bottom wall (4), in particular materially connected, in particular integrally connected, in particular molded on the bottom wall (4), wherein the protrusion (14) is in particular composed of the same material as the bottom wall (4), in particular of plastic.

4. Impeller (2) according to claim 1 or 2, characterized in that the bottom wall (4) comprises a first bottom wall region (19) and a second bottom wall region (20) arranged radially (y) outside the first bottom wall region (19) and arranged axially (x) above the first bottom wall region (19), the first bottom wall region (19) and the second bottom wall region (20) being connected to one another, in particular integrally connected, by the protrusion (14), preferably the recess bottom of the recess (17) is flush with the surface of the second bottom wall region (20) of the bottom wall (4).

5. Impeller (2) according to any one of claims 1-4, characterized in that the wall thickness of the protrusion (14) is substantially equal to the wall thickness of the body (3) of the impeller (2), in particular substantially equal to the wall thickness of the bottom wall (4) or of the blade; Alternatively, the number of protrusions (14) is more than two, in particular three, four, five or six, which are preferably spaced apart from one another and preferably arranged equidistant from one another.

6. Fan, preferably for a household appliance, comprising an electric motor and an impeller (2) according to any one of the preceding claims 1 to 5.

7. The fan of claim 6 wherein, the electric motor comprises a magnet yoke (11) fixedly connected to the side wall (5) of the impeller (2), wherein the magnet yoke (11) comprises a first magnet yoke section (12) which at least partially fits into the recess (17) in radial direction (y) in a form-fit manner.

8. The fan of claim 7 wherein, the magnet yoke (11) further comprises a second magnet yoke section (12') which is spaced apart from the protrusion (14) in radial direction (y) so that a second gap (b) is formed.

9. The fan of claim 6 or 7, wherein the electric motor comprises a stator insulation support (9) which is spaced apart from the protrusion (14) in radial direction (y) so that a first gap (a) is formed.

10. The fan of claim 6 or 7, wherein the electric motor comprises a magnet (10) arranged on the magnet yoke (11) which is spaced apart from the protrusion (14) in axial direction (x) so that a third gap (c) is formed.

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