CN210541120U - Low-noise cooling fan and food processor - Google Patents

Abstract

The utility model discloses a radiator fan and food preparation machine of low noise, radiator fan include the base of disc, locate base upper surface and radial extension's a plurality of blades integratively, the side that the blade is located the rotation direction front side is the air-out face, with the coaxial face of cylinder of base with it forms a contained angle that is greater than zero at least to have between the tangent line at two points on the crossing line of the air-out face of blade. The food processor comprises a base with a motor, a stirring cup arranged on the base and a crushing knife arranged in the stirring cup, wherein the heat dissipation fan is arranged below the motor and is coaxially connected with the motor. The utility model discloses an aspect can show the noise that reduces fan and corresponding food preparation machine, on the other hand, and simple structure makes things convenient for processing, therefore is fit for popularization.

Description

Low-noise cooling fan and food processor

Technical Field

The utility model belongs to the technical field of food preparation machine, especially, relate to a radiator fan and food preparation machine of low noise.

Background

Conventional food processors for juicing and grinding food generally comprise a base, a stirring cup arranged above the base, a crushing blade arranged at the bottom of the stirring cup, and a motor arranged in the base and used for driving the crushing blade to rotate at a high speed. When the motor drives the crushing knife to rotate at high speed, the fruit in the stirring cup can be squeezed or food can be ground. Because the motor in the machine base needs to rotate at a high speed during working and the working load of the motor is larger, the load of the motor is larger especially when hard or tough foods are crushed. Therefore, a centrifugal heat dissipation fan connected with a motor shaft is generally required to be arranged below the motor, and when the motor runs, the heat dissipation fan can be driven to rotate at a high speed, so that good heat dissipation of the motor is realized, and normal work of the motor is ensured.

The existing centrifugal heat dissipation fan generally comprises a disc-shaped base, wherein a plurality of flaky blades which are uniformly distributed in the circumferential direction are radially arranged on the base, the side surface of each flaky blade, which is positioned on the front side in the rotation direction, is an air outlet surface, the air outlet surface is vertical to the upper surface of the base, a gap between every two adjacent flaky blades forms a fan-shaped heat dissipation channel, the small end, which is close to the middle of the base, of each heat dissipation channel is an air inlet end, and the large end, which is close to the edge of the base, of each heat dissipation channel is an air outlet end. When the motor drives the heat dissipation fan to rotate at a high speed, air between adjacent sheet-shaped blades rotates at a high speed under the driving of the sheet-shaped blades to form centrifugal force, and then is thrown outwards from the air outlet end, and correspondingly, air heated by the motor outside enters the heat dissipation channel from the air inlet end, so that air flowing is formed, and heat dissipation of the motor is realized.

However, the existing heat dissipation fan structure has the following defects: it is known that when a centrifugal fan rotates at a high speed, an air outlet surface of a sheet-shaped blade drives air to rotate at a high speed to form a centrifugal effect, and at this time, the air escapes from an upper edge of the sheet-shaped blade, and a large speed difference is formed between the speed of the escaping air and the air pushed by the blade, so that a vortex is formed, and a main cause of noise is generated during the vortex. In particular, when the rotating speed of the blade is higher, the noise is also higher, the frequency of the noise is also higher, and the rotating speed of the motor of the existing food processor is higher, and accordingly, the noise generated by the heat dissipation fan is higher, thereby seriously affecting the user experience of the user.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a radiator fan and food preparation machine of low noise can show the noise that reduces fan and corresponding food preparation machine on the one hand, and on the other hand, simple structure facilitates the processing, therefore is fit for popularizing.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a low-noise radiating fan comprises a disc-shaped base and a plurality of blades integrally arranged on the upper surface of the base and extending radially, wherein the side surface of each blade positioned on the front side in the rotating direction is an air outlet surface, and an included angle larger than zero is formed between tangent lines of at least two points on the intersecting line of a cylindrical surface coaxial with the base and the air outlet surface of each blade.

It is known that the air outlet surface of the blade of the cooling fan of the prior food processor is perpendicular to the base, that is, the intersecting line of the cylindrical surface coaxial with the base and the air outlet surface of the blade is a straight line perpendicular to the upper surface of the base, and the air outlet surface is formed by scanning the straight line along a trajectory such as an involute curve. Therefore, when the blade rotates at a high speed, a strong vortex is formed at the upper edge of the blade, thereby generating a noise having a sine wave-like waveform. And the utility model discloses to set to the intersection line with the coaxial face of cylinder of base and the air-out face of blade and have to form a contained angle that is greater than zero between the tangent line at two points at least, that is to say, the air-out face is changed by unsmooth undulation in vertical cross-section. Therefore, the air outlet surface is actually a concave surface or a convex surface or a curved surface connected with a concave surface and a convex surface in the vertical direction. When the blade rotates at a high speed, the local air outlet surfaces with different concave-convex directions in the vertical direction form waveform noises with the same frequency and different phases. Because a phase difference is formed between the noises with different waveforms, the noises with different waveforms have a mutual cancellation effect instead of a simple superposition. Therefore, the intensity of the noise ultimately generated by the blade may be greatly reduced. It can be understood that the utility model discloses only make the change in the shape of blade, structurally, can reduce the noise of fan during operation correspondingly promptly, therefore have simple structure, be favorable to the advantage of popularization.

Preferably, the air outlet surface comprises an arc-shaped outer convex surface and an arc-shaped inner concave surface, and the outer convex surface and the inner concave surface are smoothly connected in the axial direction of the base, so that the intersecting line is S-shaped.

In this embodiment, the convex surface and the concave surface are smoothly connected to form an S shape or an inverted S shape, that is, the shapes, sizes, and the like of the convex surface and the concave surface are substantially matched. Therefore, on one hand, the structural design and the manufacture of the blade are facilitated, and on the other hand, the amplitudes of the waveforms of the noise formed by the vortexes generated by the outer convex surface and the inner concave surface are basically the same and are opposite in direction, so that the two noises can be offset mutually, and the noise reduction effect is improved. In addition, the S-shaped blades can increase the contact area of the air outlet surface and the air as much as possible on the premise of not increasing the height of the blades, and further the air outlet quantity of the fan is favorably improved.

Preferably, the convex outer surface is located at an upper portion of the concave inner surface.

Therefore, the air outlet surface of the blade is in a reverse S shape, the upper side of the outer convex surface, namely the included angle between the tangent line at the upper edge of the air outlet surface of the blade and the flowing direction of the airflow relative to the blade, can be reduced to the maximum extent, and therefore the vortex generated at the upper end of the blade is reduced, and further noise reduction is facilitated.

Preferably, the outlet face comprises an arcuate convex or concave outer face, such that the line of intersection is C-shaped.

It is known that the cooling fan can be formed by molding, compared with the S-shaped air outlet surface, the C-shaped air outlet surface formed by a single outer convex surface or inner concave surface is convenient to mold, and the C-shaped air outlet surface is also beneficial to forming an upper cambered surface and a lower cambered surface which are smoothly connected together and are basically symmetrical and are outwards or inwards concave, so that the amplitudes of the waveforms of the noises formed by the vortexes generated by the upper cambered surface and the lower cambered surface which are basically symmetrical are completely the same, and the directions are opposite, thereby being beneficial to offsetting the two noises and improving the noise reduction effect.

Preferably, the upper edge of the air outlet surface of the blade is provided with a peak avoiding chamfer.

The blade is known to have a certain thickness, and the peak avoiding chamfer arranged on the upper edge of the air outlet surface of the blade is beneficial to further reducing the included angle between the tangent line at the upper edge of the air outlet surface of the blade and the flowing direction of the airflow relative to the blade, so that the vortex generated at the upper end of the blade is reduced, and the noise is further reduced.

Preferably, the outer edge of the air outlet surface of the blade, which is far away from the axis of the base, is provided with a peak avoiding chamfer.

It will be appreciated that as the blade rotates in height, a vortex is also formed at the outer edge of the blade outlet and thus generates noise. Similar with above-mentioned scheme, set up the peak-avoiding chamfer at blade air-out surface outer fringe can show and reduce the tangent line of blade air-out surface's outer edge and the relative contained angle between the flow direction of blade of air current, and then reduce the vortex that the blade outer end produced to further noise reduction.

Preferably, the maximum height difference between the inner concave surface and the outer convex surface is b, and 0.2mm ≦ b ≦ 0.8 mm.

By reasonably setting the maximum height difference between the inner concave surface and the outer convex surface, the noise reduction effect can be improved to the maximum extent on the premise of facilitating the processing and manufacturing of the blade as much as possible. When b is less than 0.2mm, the concave-convex fluctuation of the air outlet surface is not obvious, so that the phase difference of the noise formed by the vortex at the upper part and the lower part of the blade is extremely small, the two noises cannot be mutually offset, and the noise reduction is not facilitated. When b is more than 0.8mm, on one hand, the molding difficulty of the blade is increased, and on the other hand, the phase difference of the noises formed by the vortex flow at the upper part and the lower part of the blade is larger than half amplitude of the noise waveform, which is also not beneficial to the mutual offset of the two noises.

Preferably, a groove corresponding to the vane is provided on the lower surface of the base.

It will be appreciated that the base is thickest where the vanes are located and therefore, as the plastics material is moulded, it is prone to uneven cooling rates due to uneven wall thickness, which can lead to cumulative defects such as surface sink marks. Set up the recess at the base lower surface, can make the wall thickness of base keep even, be favorable to avoiding appearing the shaping flaw, can not influence the joint strength of blade and base simultaneously.

Preferably, the depth of the groove is h, and 0.5mm ≦ h ≦ 1.2 mm.

Through reasonably setting the depth of the groove, the thicknesses of the base and the blades and the thickness of the joint of the blades of the base are basically uniform, and the forming defects on the surface of the fan can be effectively eliminated and avoided on the premise of not influencing the joint strength of the base and the blades. When h is less than 0.5mm, the wall thickness of the joint of the blade and the base is still far larger than that of the base and the blade, so that the forming defects on the surface of the fan are difficult to effectively eliminate and avoid. When h is more than 1.2mm, the wall thickness of the joint of the blade and the base is too thin, thereby reducing the joint strength of the blade and the base.

A food processor comprises a base with a motor, a stirring cup arranged on the base, and a crushing knife arranged in the stirring cup, wherein the radiating fan is arranged below the motor and is coaxially connected with the motor.

As before, the utility model discloses a noise when radiator fan can show to reduce high-speed rotation, consequently, the food preparation machine that adopts this radiator fan can reduce the noise of during operation equally widely, improves user experience to need not to change the structure setting and the assembly structure of complete machine.

Therefore, the utility model discloses following beneficial effect has: on one hand, the noise of the fan and the corresponding food processor can be obviously reduced, and on the other hand, the structure is simple and convenient to process, so that the electric fan is suitable for popularization and promotion.

Drawings

Fig. 1 is a schematic structural diagram of a heat dissipation fan.

Fig. 2 is a schematic view of a blade structure.

Fig. 3 is another structural schematic view of the blade.

Fig. 4 is a schematic structural view when a peak avoiding chamfer is provided at the upper end of the blade.

Fig. 5 is a schematic structural view when peak-avoiding chamfers are arranged at the upper end and the outer end of the blade.

FIG. 6 is a schematic diagram of a food processor configuration.

In the figure: 1. the air-conditioner comprises a base 11, a groove 2, blades 21, an air outlet surface 211, an outer convex surface 212, an inner concave surface 22, a peak avoiding chamfer 3, a machine base 4, a motor 5, a stirring cup 6, a crushing cutter 7 and a cooling fan.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example 1: as shown in fig. 1, a low-noise heat dissipation fan 7 is a centrifugal fan, and specifically includes a disc-shaped base 1, and a plurality of blades 2 integrally disposed on an upper surface of the base and extending radially, wherein a side surface of the blade located in front of a rotation direction g of the heat dissipation fan is an air outlet surface 21. It will be appreciated that as part of the prior art, the locus or shape of the blades in the radial direction may be involute, archimedes spiral, or may be otherwise curved with suitable curvature to facilitate accurate control of the shape of the blades.

Noise reduction methods are known to be divided into passive and active noise reduction. Particularly, the air outlet surface of the blade can form concave-convex fluctuation in the vertical direction, so that an included angle larger than zero is formed by tangents of at least two points on an intersection line formed by a cylindrical surface coaxial with the base and the air outlet surface of the blade. Or, it can be said that the included angle formed between the tangent line of at least two points on the intersecting line and the vertical line is different. Therefore, the air outlet surface is a concave surface or a convex surface or a curved surface connected with a concave surface and a convex surface in the vertical direction. When the blade rotates at a high speed, each local area with different included angles between the tangent line and the vertical line in the up-down direction of the air outlet surface of the blade can form noise with different characteristics, and the frequency of each noise is consistent and the phase is different. Therefore, the noises with different waveforms with phase differences have the functions of mutual offset and attenuation, and the intensity of the finally generated noise of the blade is greatly reduced. That is to say, the utility model discloses an utilize the noise of the different phases of blade production to offset each other and realize initiatively falling the noise, both can simplify the structure setting, can improve the effect of making an uproar again fully.

Preferably, as shown in fig. 2, the air outlet surface includes an arc-shaped outer convex surface 211 and an arc-shaped inner concave surface 212, and the outer convex surface and the inner concave surface are smoothly connected in the axial direction of the base, so that the aforementioned intersecting line is in a forward S shape or a reverse S shape. Of course, the thickness of the blade should be uniformly set, and in particular, the thickness of the blade may be 1 mm. That is, the lobes are formed by scanning an S-shaped cross-section along a trajectory such as an involute, Archimedes spiral, or the like, such that the shapes, sizes, or the like of the convex and concave surfaces are substantially matched. Like this, the range of the wave form of the noise that the vortex that produces by outer convex surface and interior concave surface formed can the same basically to opposite direction, therefore be favorable to making two noises offset each other, improves noise reduction, still can increase the area of contact of air-out face and air as far as possible, and then be favorable to improving the air output of fan.

It can be understood that the phase difference of the eddy currents generated by the outer convex surface and the inner concave surface is close to integral multiple of the noise sound wave as much as possible by reasonably designing the concave depth of the inner concave surface and the convex height of the outer convex surface, so that the upper sound wave and the lower sound wave can be counteracted with each other to the maximum extent to reduce the noise.

It is known that, in the case of a plastic molded heat dissipation fan, the unevenness of the blade surface increases the difficulty of manufacturing the fan. When the maximum height difference between the inner and outer convex surfaces is b, we can control the maximum height difference to be in the following range: b is more than or equal to 0.2mm and less than or equal to 0.8 mm. On the one hand, make the unsmooth gentleness on blade surface as far as possible to make things convenient for the processing manufacturing of blade, on the other hand makes the phase difference of the vortex that outer convex surface and interior concave surface produced be close to the integral multiple of noise sound wave as far as possible, thereby furthest improves the noise reduction effect.

preferably, the outer convex surface is located at the upper part of the inner concave surface, so that the air outlet surface of the blade is in a reverse S shape, and at the moment, the included angle alpha between the tangent line a at the upper side of the outer convex surface (namely the upper edge of the air outlet surface of the blade) and the flow direction d of the airflow relative to the blade (which is just opposite to the rotation direction of the blade) can be reduced to the maximum extent, so that the vortex generated at the upper end of the blade is reduced, and further noise reduction is facilitated.

As another preferred solution, the air outlet surface comprises an arc-shaped convex outer surface or an arc-shaped concave inner surface, so that the aforementioned intersection line is C-shaped. Preferably, as shown in fig. 3, the air outlet surface includes an arc-shaped convex outer surface, so that the aforementioned intersecting line is in a convex C shape. The C-shaped air outlet surface formed by the single outer convex surface or the single inner concave surface facilitates the molding of the cooling fan, and on the other hand, the amplitude of the waveform of the noise formed by the vortex generated by the upper cambered surface and the lower cambered surface is enabled to be as close as possible, the directions are opposite, so that the two noises can be offset mutually, and the noise reduction effect is improved. Preferably, the C-shaped outer convex surface or the C-shaped inner concave surface can be arranged vertically symmetrically with respect to the horizontal central axis, so as to form two symmetrical arc surfaces which are smoothly connected together, so that the amplitudes of the waveforms of the noise formed by the vortices generated by the upper and lower arc surfaces are approximately the same, and the noise reduction effect can be further improved.

Further, as shown in fig. 4, a peak avoiding chamfer 22 may be further disposed at an upper edge of the air outlet surface of the blade, so as to reduce an included angle between a tangent line at the upper edge of the air outlet surface of the blade and a flowing direction of the airflow relative to the blade, and further reduce a vortex generated at an upper end of the blade, so as to further reduce noise. It can be understood that the angle between the tangent of the peak avoiding chamfer at the upper edge of the air outlet surface of the blade and the flow direction of the airflow relative to the blade is zero through reasonable design, so that the noise can be reduced to the maximum extent.

Certainly, as shown in fig. 5, we can also set a peak avoiding chamfer on the outer edge of the blade air-out surface far away from the axis of the base, so that the included angle between the tangent line at the outer edge of the blade air-out surface and the flow direction of the airflow relative to the blade can be remarkably reduced, and then the vortex generated at the outer end of the blade is reduced, so as to further reduce the noise. According to the above, the reasonable design can be adopted, so that the included angle between the tangential direction of the peak avoiding chamfer at the outer edge of the air outlet surface of the blade and the flowing direction of the airflow relative to the blade is zero, and the noise can be reduced to the maximum extent.

It is known that the horizontal housing and the substantially vertical blades form an inverted T-shaped connection, for which purpose recesses 11 corresponding to the blades are provided in the lower surface of the base, so that the wall thickness at the connection between the base and the blades is as uniform as possible as the wall thickness elsewhere in the base. When the heat radiation fan is molded, the cooling speed of each part of the product can be kept uniform, defects such as shrinkage marks on the surface and internal air holes can be avoided, and the weight of the heat radiation fan can be reduced.

Preferably, the depth of the groove is h, and the depth of the groove can be controlled in the following range: h is more than or equal to 0.5mm and less than or equal to 1.2mm, in the embodiment, the thickness of the blade is 1mm, the thickness of the base is 2mm, and the depth of the groove is 0.8mm, so that on one hand, the thicknesses of the base and the blade and the thickness of the joint of the base and the blade are basically uniform, and the forming defects on the surface of the fan are eliminated and avoided; on the other hand, the blade and the base have enough connection strength, and the blade is prevented from being broken when the cooling fan rotates at high speed.

Example 2: as shown in fig. 6, a food processor comprises a base 3 having a motor 4, a stirring cup 5 provided on the base, a crushing blade 6 provided in the stirring cup, and a centrifugal heat radiation fan 7 provided below the motor, the heat radiation fan comprising a base having a disk shape and blades provided on an upper surface of the base, wherein a lower end of a motor shaft is connected to a center of the base. When the motor rotates at a high speed, the heat radiation fan can be driven to rotate at a high speed, so that the motor can radiate heat well. Specifically, the structure of the heat dissipation fan is the same as that of the heat dissipation fan of the embodiment, and will not be described herein too much. Because the cooling fan can obviously reduce the noise during high-speed rotation, the food processor adopting the cooling fan can also greatly reduce the noise during working, improve the user experience, and does not need to change the structural arrangement and the assembly structure of the whole machine.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims (10)

1. A low-noise radiating fan comprises a disc-shaped base and a plurality of blades integrally arranged on the upper surface of the base and extending radially, wherein the side surface of each blade positioned on the front side in the rotating direction is an air outlet surface.

2. The heat dissipating fan with low noise as claimed in claim 1, wherein the outlet surface includes an outer convex surface and an inner concave surface which are curved and smoothly connected in the axial direction of the base, so that the intersecting line is S-shaped.

3. The heat dissipating fan with low noise as claimed in claim 2, wherein the outer convex surface is located at an upper portion of the inner concave surface.

4. The heat dissipating fan with low noise as claimed in claim 1, wherein the outlet surface includes an arc-shaped convex or concave surface so that the intersection line is C-shaped.

5. The heat dissipating fan with low noise as claimed in claim 1, wherein the top edge of the outlet surface of the blade is provided with a peak-avoiding chamfer.

6. The heat dissipating fan with low noise as claimed in claim 1, wherein the outer edge of the outlet surface of the blade away from the axis of the base is provided with a peak-avoiding chamfer.

7. The heat dissipating fan with low noise as claimed in claim 4, wherein the maximum height difference between the inner and outer convex surfaces is b, and 0.2 mm. ltoreq. b.ltoreq.0.8 mm.

8. The heat dissipating fan with low noise as claimed in claim 1, wherein grooves corresponding to the blades are formed on the lower surface of the base.

9. The heat dissipating fan with low noise as claimed in claim 8, wherein the depth of the groove is h, and h is 0.5mm or more and 1.2mm or less.

10. A food processor comprising a frame with a motor, a mixing cup arranged on the frame, a crushing knife arranged in the mixing cup, characterized in that a cooling fan according to claims 1 to 9 is arranged below the motor, said cooling fan being coaxially connected to the motor.

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