Cooling fan and food mixing machine

Abstract

The utility model discloses a cooling fan which comprises a base plate, a fixing seat and a plurality of fan blades, the fixing seat is arranged in the center of the base plate, a shaft hole used for being connected with a rotating shaft is formed in the center of the fixing seat, the fan blades are distributed on the base plate at intervals in the circumferential direction of the shaft hole, the ends, away from the fixing seat, of the fan blades are outer edges, and the ends, close to the fixing seat, of the fan blades are inner edges. And a vacancy is reserved between the inner edge of the fan blade and the fixed seat. The fan blades are not connected with the fixing base through the vacant positions, air in the vacant positions can be exhausted in the rotating process of the cooling fan, the rotation phenomenon of the center of the cooling fan is avoided, and therefore the cooling efficiency of the cooling fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of food mixers, in particular to a food mixer and a heat dissipation fan used by the food mixer. Background Art

[0002] At present, the food mixers on the market, such as wall breaking machines or soy milk machines, use series motors or DC motors to drive the stirring device to rotate. The series motors or DC motors have high speeds and high power, which will cause the motor to generate a lot of heat. Therefore, a cooling fan is usually installed on the motor to dissipate the heat of the motor. However, the exhaust efficiency of the cooling fan is not high, and the scattered air outlet direction will cause the motor temperature to rise too high, resulting in motor failure. In order to ensure the normal operation of the food mixer, manufacturers are forced to use higher specification motors to meet the usage requirements, resulting in increased costs. Utility Model Content

[0003] The utility model aims to provide a heat dissipation fan which can improve the heat dissipation effect.

[0004] The purpose of the utility model is achieved in this way.

[0005] A heat dissipation fan, comprising

[0006] The base plate has a fixed seat at the center.

[0007] The fixed seat has a shaft hole in the center for connecting the rotating shaft.

[0008] A plurality of fan blades are arranged on the base plate at intervals in the circumferential direction around the shaft hole, the end of the fan blade away from the fixing seat is the outer edge, the end of the fan blade close to the fixing seat is the inner edge, and a space is left between the inner edge of the fan blade and the fixing seat.

[0009] The utility model makes the fan blade and the fixing seat unconnected through the empty space, and the air in the empty space can be discharged during the rotation of the cooling fan, so as to avoid the rotation phenomenon in the center of the cooling fan, thereby improving the cooling efficiency of the cooling fan.

[0010] The above technical solution can be further improved as follows.

[0011] Furthermore, adjacent fan blades are of different lengths, and the base plate, the fixing seat and the fan blades are integrally formed. The heat dissipation fan structure is firm and convenient for injection molding.

[0012] Furthermore, the fan blade includes a first blade and a second blade. The length of the second blade is shorter than that of the first blade. The second blade is disposed between two first blades. The distance between the inner edge of the second blade and the fixed seat is greater than the distance between the inner edge of the first blade and the fixed seat. An air inlet is formed between the inner edges of the two first blades, and an air outlet is formed between the outer edges of the first blade and the second blade. The expansion of the air inlet is beneficial for more airflows to pass through the cooling fan, thereby improving the heat dissipation efficiency of the cooling fan.

[0013] Furthermore, the outer edges of the first blade and the second blade are on the same circumferential plane. The air outlet discharges air evenly and stably.

[0014] Furthermore, the substrate is inclined. The substrate and the fixed seat are connected by an arc transition portion. The included angle between the substrate and the axis of the shaft hole is 94 - 120°. The inclined substrate guides the airflows to flow obliquely downward, avoiding the airflows from flowing back above the cooling fan and causing hot air circulation. The substrate controls the heat dissipation direction and improves the heat dissipation efficiency.

[0015] Furthermore, the included angle between the substrate and the axis of the shaft hole is 96°.

[0016] Furthermore, an inclined surface is provided at the inner edge of the fan blade. The inclined surface gradually approaches the fixed seat from top to bottom. The inclined surface forms a low - pressure area smaller than the range of the fan blade at the vacant position after the cooling fan rotates, so as to more effectively guide the airflows into the air inlet.

[0017] Furthermore, the included angle between the inclined surface and the axis of the shaft hole is 20 - 40°.

[0018] Furthermore, the included angle between the inclined surface and the axis of the shaft hole is 30°.

[0019] A food blender includes a cup body. A stirring device is provided inside the cup body. A motor for driving the stirring device to rotate is provided below the cup body. The above - mentioned cooling fan is disposed below the motor, and the motor drives the cooling fan to rotate.

[0020] After the food blender adopts this cooling fan, due to the improvement of the air - discharging efficiency and directivity of the cooling fan, the working environment temperature of the motor is lower, ensuring the stable operation of the motor, avoiding the need to use a higher - performance motor, and controlling the cost, which is beneficial to improving the market competitiveness.

[0021] In the present utility model, the fan blade and the fixed seat are not connected through the vacant position. During the rotation of the cooling fan, the air at the vacant position can be discharged, avoiding the formation of a swirling phenomenon at the center of the cooling fan. The heat dissipation efficiency of the cooling fan is improved compared with that of the traditional cooling fan, and it can meet a greater heat dissipation requirement. Description of the Drawings

[0022] Figure 1 Top view of Embodiment 1

[0023] Figure 2 Schematic cross-sectional structure diagram of the first embodiment (only showing part of the fan blades).

[0024] Figure 3 Schematic three-dimensional structure diagram of the first embodiment (only showing part of the fan blades).

[0025] Figure 4 Schematic cross-sectional structure diagram of a food blender (the curved line with an arrow is the air flow direction). Specific implementation manners

[0026] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] In the first embodiment, as shown in Figures 1 - 3 A heat dissipation fan includes a substrate 1, a fixed seat 2, and a plurality of fan blades 3. A fixed seat 2 is provided at the center of the substrate 1, and a shaft hole 21 for connecting a rotating shaft is provided at the center of the fixed seat 2. The plurality of fan blades 3 are circumferentially spaced apart around the shaft hole 21 on the substrate 1. One end of the fan blade 3 away from the fixed seat 2 is an outer edge 31, and one end of the fan blade 3 close to the fixed seat 2 is an inner edge 32. A space 30 is left between the inner edge 32 of the fan blade 3 and the fixed seat 2.

[0028] In this embodiment, the substrate 1 is inclined, and the substrate 1 and the fixed seat 2 are connected by an arc transition portion 11. The included angle a between the axis of the substrate 1 and the axis of the shaft hole 21 is 94 - 120°. Preferably, the included angle a between the axis of the substrate 1 and the axis of the shaft hole 21 is 96°. The inclination of the substrate 1 means that at least the top surface of the substrate 1 is inclined. Here, it refers to the included angle a between the tangent line of the cross-section of the substrate 1 (overall inclination) or the top surface of the substrate 1 (top surface inclination) and the axis of the shaft hole 21.

[0029] The inner edge 32 of the fan blade 3 is provided with an inclined surface 33. The inclined surface 33 gradually approaches the fixed seat 2 from top to bottom, but the inclined surface 33 does not contact the fixed seat 2. The included angle b between the inclined surface 33 and the axis of the shaft hole 21 is 20 - 40°. Preferably, the included angle b between the inclined surface 33 and the axis of the shaft hole 21 is 30°.

[0030] Among them, the lengths of adjacent fan blades 3 are not equal. Specifically, the fan blade 3 includes an equal number of first blades 4 and second blades 5. The length of the second blade 5 is shorter than that of the first blade 4. The second blade 5 is provided between two first blades 4. The distance between the inner edge 32 of the second blade 5 and the fixed seat 2 is greater than the distance between the inner edge 32 of the first blade 4 and the fixed seat 2. An air inlet 6 is formed between the inner edges 32 of the two first blades 4. The outer edges 31 of the first blade 4 and the second blade 5 are on the same circumferential surface. An air outlet 7 is formed between the outer edge 31 of the first blade 4 and the outer edge 31 of the second blade 5. Among them, both the first blade 4 and the second blade 5 are bent in the radial direction, that is, the first blade 4 and the second blade 5 extend in a curve. The lengths of the first blade 4 and the second blade 5 refer to their overall lengths, that is, the distance from the inner edge 32 to the outer edge 31.

[0031] In the utility model, the substrate 1, the fixed seat 2 and the fan blade 3 are integrally injection-molded.

[0032] See Figure 4 As shown, a food blender includes a machine base 8 and a cup body 9. The cup body 9 is arranged on the machine base 8. A stirring device (not shown in the figure) is arranged in the cup body 9. A motor 10 for driving the stirring device to rotate is arranged in the machine base 8 below the cup body 9. A cooling fan is arranged below the motor 10. The rotating shaft of the motor 10 is inserted into the shaft hole 21, and the rotating shaft drives the cooling fan to rotate. The rotation of the cooling fan discharges the internal air flow obliquely downward from the air outlet 7 and inhales the air at the vacancy 30 from the air inlet 6, so that a low-pressure area is formed at the vacancy 30, and then the air flow around the motor 10 flows downward to the vacancy 30, thus realizing the cooling of the motor 10 by the cooling fan.

[0033] Of course, the motor 10 can be directly arranged at the bottom of the cup body 9 to drive the stirring device to rotate, and the cooling fan is installed on the bottom surface of the cup body 9 together with the motor 10.

Claims

1. A heat dissipation fan, characterized in that, including a substrate with a fixing base provided at its center, the fixing base having a shaft hole at its center for connecting a rotating shaft, a plurality of fan blades circumferentially spaced around the shaft hole on the substrate, with the outer end of the fan blade away from the fixing base being the outer edge and the inner end of the fan blade close to the fixing base being the inner edge, and a space being left between the inner edge of the fan blade and the fixing base; adjacent fan blades having unequal lengths, and the substrate, the fixing base and the fan blades being integrally formed.

2. The cooling fan according to claim 1, characterized in that, The substrate is inclined, and the substrate and the fixing base are connected by an arc transition portion, and the angle between the substrate and the axis of the shaft hole is 94 - 120°.

3. The cooling fan according to claim 1, characterized in that The fan blade includes a first blade and a second blade, the second blade being shorter than the first blade in length, the second blade being provided between two first blades, the distance between the inner edge of the second blade and the fixing base being greater than the distance between the inner edge of the first blade and the fixing base, an air inlet being formed between the inner edges of the two first blades, and an air outlet being formed between the outer edge of the first blade and the outer edge of the second blade.

4. The cooling fan according to claim 3, wherein The outer edges of the first blade and the second blade are on the same circumferential plane.

5. The cooling fan according to claim 2, characterized in that, The angle between the substrate and the axis of the shaft hole is 96°.

6. The cooling fan according to claim 1, characterized in that, The inner edge of the fan blade is provided with an inclined surface that gradually approaches the fixing base from top to bottom.

7. The cooling fan according to claim 6, characterized in that, The angle between the inclined surface and the axis of the shaft hole is 20 - 40°.

8. The cooling fan according to claim 7, characterized in that, The angle between the inclined surface and the axis of the shaft hole is 30°.

9. A food blender, comprising a cup body, a stirring device is arranged in the cup body, and a motor for driving the stirring device to rotate is arranged below the cup body, characterized in that, The cooling fan as described in any one of claims 1 - 8 is provided below the motor, and the motor drives the cooling fan to rotate.

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