Food processor with air duct noise reduction structure

Abstract

The utility model discloses a food processor with an air duct noise reduction structure, which comprises a main machine assembly and a stirring cup assembly, the stirring cup assembly comprises a cup body and a stirring knife arranged in the cup body, the main machine assembly comprises a base, a motor, a cooling fan and an air duct assembly, the motor, the cooling fan and the air duct assembly are arranged in the base, and the lower end of a motor shaft is connected with the cooling fan. The motor drives the stirring knife and the heat dissipation fan to rotate, the air duct assembly comprises an air inlet channel which passes through the motor and dissipates heat of the motor and an air exhaust track which is arranged around the outer side of the heat dissipation fan, and the air exhaust track is provided with at least two variable cross-section structures in the air exhaust direction. The exhaust noise is reduced through the variable cross-section structure, and compared with the prior art, the noise can be reduced without excessively pursuing extension of an exhaust path, so that the height of the exhaust track can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of small kitchen appliances, in particular to a food processor. Background Art

[0002] In the prior art wall-breaking machines and food processing machines with similar functions, there is a common model that is a main unit component and a mixing cup component are separately set, and a motor component and an air duct component are set in the main unit, and the motor component drives the mixing blade in the mixing cup to rotate. When working, the heat dissipation fan of the motor needs to be used for exhaust and heat dissipation. The wind generated by the heat dissipation fan enters the air duct component, and the air duct component is provided with an exhaust air duct to exhaust the wind, but a large amount of exhaust noise is generated while exhausting the wind. The prior art discloses a base, a base component using the base, and a food processor using the base component. Among them, the base includes: a chassis, the chassis is provided with an air flow inlet and an air flow outlet arranged at intervals; the inner surface of the chassis is provided with an air collecting cavity and an air outlet cavity, and the outer surface of the chassis is provided with an air duct, and the two ends of the air duct are respectively connected to the air collecting cavity and the air outlet cavity, and the air collecting cavity is also connected to the air flow inlet, and the air outlet cavity is also connected to the air flow outlet. Among them, the air duct is extended along the surrounding direction of the side wall of the air collecting cavity. Although the exhaust path of the air duct is extended, the length of the propagation path of the noise is increased to a certain extent, so that the noise is gradually consumed on the longer propagation path and is effectively attenuated. However, extending the exhaust path also increases the height of the base, making it difficult to apply to some low-height models.

[0003] The Chinese utility model patent with the authorization announcement number CN219846230U discloses a food processing machine, which is provided with a heat dissipation duct and a noise reduction duct, wherein the noise reduction duct has a first diameter reduction section, a first diameter expansion section, a second diameter reduction section and a second diameter expansion section arranged in sequence from the motor outlet to the main machine outlet, so that the airflow passes through the control unit and the brushless motor, and then passes through the noise reduction duct and is discharged from the main machine outlet. In this way, the technical problems of heat dissipation and noise reduction of the food processing machine using a brushless motor are solved. However, such a technical solution still has certain shortcomings: on the one hand, the heat dissipation duct and the noise reduction duct occupy a large volume in the spatial arrangement, which increases the volume of the motor and the shell forming the heat dissipation duct and the noise reduction duct, and also increases the body volume of the food processing machine; on the other hand, the noise reduction duct formed by the first diameter reduction section, the first diameter expansion section, the second diameter reduction section and the second diameter expansion section is not long, which also makes the airflow discharged from the motor outlet quickly discharged from the main machine outlet, greatly reducing the noise reduction efficiency of the noise reduction duct. Utility Model Content

[0004] Aiming at the defects of the prior art, the technical problem to be solved by the present utility model is to provide a food processor with an air duct noise reduction structure. By changing the arrangement structure of the exhaust air track and optimizing the spatial structure relationship among the air duct motor, the cooling fan and the air duct assembly, not only can the exhaust air noise be further reduced, but also it is beneficial to apply to some low-height models.

[0005] To solve the above technical problem, the present utility model adopts the following technical solution: A food processor with an air duct noise reduction structure includes a main machine assembly and a mixing cup assembly. The mixing cup assembly includes a cup body and a mixing knife disposed in the cup body. The main machine assembly includes a base and a motor, a cooling fan and an air duct assembly disposed in the base. The lower end of the motor shaft is connected to the cooling fan, and the motor drives the mixing knife and the cooling fan to rotate. The air duct assembly includes an air inlet passage that passes through the motor and dissipates heat from the motor, and an exhaust air track disposed around the outside of the cooling fan. The exhaust air track is provided with at least two variable cross-section structures along the exhaust air direction.

[0006] Preferably, a protruding portion protruding radially inward or outward is provided on a partial inner side wall and / or outer side wall of the exhaust air track. The radial width of the exhaust air track is changed by the protruding portion, thereby forming a variable cross-section structure.

[0007] Preferably, the protruding portion is arc-shaped.

[0008] Preferably, the exhaust air track extends downward in a spiral shape, and the upper end is connected to the air outlet end of the air inlet passage, and the lower end is provided with an air outlet.

[0009] Preferably, the number of spiral turns of the exhaust air track is greater than 1.

[0010] Preferably, the exhaust air track includes a circular inner side wall and an outer side wall with a protruding portion. The outer side wall protrudes outward so that the overall shape of the exhaust air track is a rectangular structure.

[0011] Preferably, the exhaust air track includes an exhaust air upper shell and an exhaust air lower shell combined into one body. Exhaust air retaining ribs for forming the track side walls are provided on the opposite surfaces of the exhaust air upper shell and the exhaust air lower shell.

[0012] Preferably, the exhaust air retaining ribs on the opposite surfaces of the exhaust air upper shell and the exhaust air lower shell are provided with an uneven engagement structure; and / or, a plurality of sound-absorbing columns are provided at the air outlet of the exhaust air track; and / or, air duct cotton is provided in the exhaust air track.

[0013] Preferably, a base air inlet hole and a base air outlet hole are provided on the base.

[0014] Preferably, a circuit board bracket is installed in the base, and the circuit board bracket is disposed on the air inlet path between the base air inlet hole and the air inlet passage.

[0015] The technical solution adopted by the present utility model has the following beneficial effects:

[0016] 1. Since the exhaust air track is provided with at least two variable cross-section structures along the exhaust air direction, through the variable cross-section structures, not only the exhaust air speed is reduced, so that the speed of the air discharged from the exhaust air outlet at the end of the exhaust air track is reduced, reducing the exhaust air noise, but also the sound wave energy can be effectively attenuated and the noise can be fully absorbed. Therefore, the noise reduction effect is good.

[0017] Since the exhaust air track is arranged around the outside of the heat dissipation fan, it does not occupy additional height space, and greatly compresses the space size occupied by the exhaust air track in the axial and radial directions. The extension path of the exhaust air track can also be extended. Since the variable cross-section structure is used to reduce the exhaust air noise, compared with the prior art, there is no need to overly pursue the extension of the exhaust air path to reduce the noise. In this way, the height of the exhaust air track can be reduced, so that the overall height of the air duct assembly can be controlled and it can also be applied to some low-height models. Due to the greatly improved utilization rate of the space size, the overall dimensions of the main machine assembly of the food processor and the extension length of the exhaust air track can achieve a better balance. Thus, on the premise of further reducing the main machine assembly, the length of the exhaust air track can be extended, or on the premise that the overall dimensions of the main machine assembly remain unchanged, the length of the exhaust air track can be greatly extended, so that the air flow discharged from the motor flows through the exhaust air track with a variable cross-section structure for a longer time, and the noise reduction effect is also greatly improved.

[0018] 2. By providing protruding portions on the local inner side wall and the outer side wall, the radial width of the exhaust air track is changed, thereby forming a variable cross-section structure, that is, a variable cross-section design is carried out in the horizontal direction without carrying out a variable cross-section design in the height direction, effectively utilizing the space in the horizontal direction and not increasing the overall height of the exhaust air track.

[0019] 3. The protruding portion is arc-shaped, so that the air passes smoothly through the variable cross-section part, avoiding sudden turbulence and increasing noise.

[0020] 4. The exhaust air track extends spirally from top to bottom. After the air enters the spiral air duct, it flows circumferentially along the spiral air duct while flowing downward axially, and finally is discharged from the exhaust air outlet. Although the radial space where the air duct is located does not change, the spiral air duct extends axially in the limited radial space, increasing the exhaust air path, which can effectively attenuate the sound wave energy and fully absorb the noise. After the air enters the spiral air duct, it flows circumferentially along the spiral air duct while flowing downward axially, and finally is discharged from the exhaust air outlet. Although the radial space where the air duct is located does not change, the spiral air duct extends axially in the limited radial space, increasing the exhaust air path, which can effectively attenuate the sound wave energy and fully absorb the noise.

[0021] 5. As described above, due to the improved layout structure, the exhaust duct is directly arranged around the outside of the cooling fan. There is enough space to arrange and extend the path of the exhaust duct. The exhaust duct is arranged to surround the outside of the large cooling fan, and the number of spiral turns of the exhaust duct is greater than 1. Therefore, the exhaust path is lengthened, which hinders the transmission of sound waves and increases the sound absorption area. On the premise of ensuring sufficient heat dissipation, the attenuation period of the wind noise is extended, and the blown wind sound is almost exhausted. In particular, the exhaust duct located in the inner circle is directly connected to the motor, and the generated noise is surrounded by the exhaust duct in the outer circle. The noise will be further weakened by the exhaust duct in the outer circle during the process of outward transmission, further improving the noise reduction effect.

[0022] 6. From the cross-section or top view, the horizontal projection of the base is rectangular, and both the exhaust duct and the motor are located at the rear half side position. In order to match the shape of the base, the outer side wall is regarded as a complete circle, and convex parts are arranged at the positions corresponding to the four corners of the square. The entire exhaust duct forms an exhaust path with an inner circle and an outer square. In this way, not only convex parts are formed, but also it can match the shape of the base, making full use of the internal space of the base. That is, the extension path of the exhaust duct is extended, and the circular shape of the motor itself is fully utilized, while the housing of the main machine assembly is mostly square in space layout, further improving the space utilization rate of the main machine assembly.

[0023] 7. Exhaust ribs for forming the track side walls are provided on the opposite surfaces of the upper exhaust housing and the lower exhaust housing, and the exhaust ribs on the opposite surfaces of the upper exhaust housing and the lower exhaust housing are provided with an uneven engagement structure. In this way, through the uneven engagement structure, the relative movement between the air duct and the air duct cover during operation is avoided, reducing noise, and they can be closely matched to avoid air leakage here and reducing noise. In addition, the design of the sound absorption columns and the air duct cotton can further improve the noise reduction effect.

[0024] 8. The base is provided with a base air inlet hole and a base air outlet hole. Among them, the base air inlet hole is close to the air inlet end of the air inlet channel, so that the air entering the base enters the air inlet channel. The base air outlet hole is close to the air exhaust end of the exhaust duct, so that the exhaust air is discharged from the base air outlet hole. And because the circuit board bracket is arranged on the air path between the base air inlet hole and the air inlet channel, the circuit board can be cooled.

[0025] The specific technical solutions adopted by the present utility model and the beneficial effects brought by them will be detailedly disclosed in the following specific implementation manners in combination with the drawings. Description of the Drawings

[0026] The following further describes the present utility model in combination with the drawings and specific implementation manners:

[0027] Figure 1 It is a cross-sectional view of the food processor in the embodiment of the present utility model;

[0028] Figure 2 Cross-section of the main unit assembly in the embodiment of the present utility model Figure 1 ;

[0029] Figure 3 Structural schematic of the exhaust lower housing Figure 1 ;

[0030] Figure 4 Structural schematic of the exhaust lower housing Figure 2 ;

[0031] Figure 5 Structural schematic of the exhaust upper housing;

[0032] Figure 6 Cross-section of the main unit assembly in the embodiment of the present utility model Figure 2 ;

[0033] Figure 7 Structural schematic of the air inlet channel;

[0034] Figure 8 Structural schematic of the exhaust rail;

[0035] Figure 9 Exploded structural schematic of the air inlet channel and the motor in the embodiment of the present utility model;

[0036] In the figure: stirring cup assembly 1, cup body 11, cup cover 12, stirring blade 13, heating plate 14, main unit assembly 2, base 21, base air inlet hole 211, base air outlet hole 212, circuit board bracket 22, air duct 23, inner side wall 2301, outer side wall 2302, protruding part 23021, air duct air inlet hole 231, air duct air outlet hole 232, sound-absorbing column 233, exhaust upper housing 234, surrounding edge 235, upper exhaust baffle rib 236, rib 237, upper buckle 238, exhaust port 239, air duct cover 24, exhaust lower housing 241, lower exhaust baffle rib 242, slot 243, lower buckle 244, air duct cotton 25, motor 26, motor shaft 261, cooling fan 27, lower coupler 28. Specific embodiments

[0037] The technical solutions of the embodiments of the present utility model will be explained and described below with reference to the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0038] Those skilled in the art can understand that, without conflict, the features in the following embodiments and embodiments can be combined with each other.

[0039] The terms used in the present utility model are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as a limitation to the present utility model.

[0040] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] As Figures 1 to 9 shown, this embodiment provides a food processor, which can be specifically described by taking a wall breaker as an example. It includes a main machine assembly 2 and a mixing cup assembly 1 placed on the main machine assembly 2. The mixing cup assembly 1 includes a cup body 11, a cup cover 12 buckled on the mouth of the cup body, a mixing knife 13 arranged in the cup body, and a heating plate 14 arranged at the bottom of the cup body. The main machine assembly 1 includes a base 21, a motor 26 arranged in the base, a cooling fan 27 and an air duct assembly. The mixing knife is connected with a knife shaft, and the knife shaft passes through the heating plate 14 and is connected with the motor 26, so that the mixing knife 13 can be driven by the motor 26 to rotate.

[0042] Among them, the motor 26 has a conventional structure and can adopt a variable-frequency motor, which has a stator, a rotor, a motor shaft 261, etc. The axis of the motor is perpendicular to the horizontal plane. The cooling fan 27 is connected to the lower end of the motor shaft, and the motor shaft 261 drives the cooling fan 27 to rotate. The main machine assembly 2 and the mixing cup assembly 1 can be a split combination structure. The upper end of the motor shaft can be connected with a lower coupler 28, and the lower end of the knife shaft can be connected with an upper coupler. The lower coupler is connected with the upper coupler, so that after the main machine assembly 2 and the mixing cup assembly 1 are combined, the motor can drive the mixing knife to rotate. Of course, the main machine assembly 2 and the mixing cup assembly 1 can also be an integral structure body.

[0043] The air duct assembly is used for air intake and exhaust, and includes an air intake channel passing through the motor 26 and cooling the motor, and an exhaust track arranged around the outside of the cooling fan. The exhaust track is provided with at least two variable cross-section structures along the exhaust direction.

[0044] Since there are at least two variable cross-section structures provided along the exhaust air direction of the exhaust air track, through the variable cross-section structures, not only the exhaust air speed is reduced, so that the speed of the air discharged from the exhaust air outlet at the end of the exhaust air track is reduced, reducing the exhaust air noise, but also the acoustic wave energy can be effectively attenuated and the noise can be fully absorbed, thus the noise reduction effect is good.

[0045] Since the exhaust air track is arranged around the outside of the heat dissipation fan, it does not occupy extra height space, and greatly compresses the space size occupied by the exhaust air track in the axial and radial directions. The extension path of the exhaust air track can also be extended. Since the variable cross-section structure is used to reduce the exhaust air noise, compared with the prior art, there is no need to overly pursue the extension of the exhaust air path to reduce the noise. In this way, the height of the exhaust air track can be reduced, so that the overall height of the air duct assembly can be controlled and it can also be applied to some low-height models. Due to the greatly improved utilization rate of the space size, the outer shape size of the main machine assembly of the food processor and the extension length of the exhaust air track can achieve a better balance. Therefore, on the premise of further reducing the main machine assembly, the length of the exhaust air track can be extended, or on the premise that the outer shape size of the main machine assembly remains unchanged, the length of the exhaust air track can be greatly extended, so that the air flow discharged from the motor flows through the exhaust air track with a variable cross-section structure for a longer time, and the noise reduction effect is also greatly improved.

[0046] The exhaust air track has an inner side wall 2301 and an outer side wall 2302. In order to form a variable cross-section structure, local inner side wall 2301 and outer side wall 2302 of the exhaust air track are provided with protruding parts 23021 protruding radially inwards or outwards. The radial width of the exhaust air track is changed through the protruding parts, so as to form a variable cross-section structure. That is, the variable cross-section design is carried out in the horizontal direction, without the need for variable cross-section design in the height direction, effectively utilizing the space in the horizontal direction and not increasing the overall height of the exhaust air track.

[0047] Furthermore, the protruding part 23021 is arc-shaped. It can make the air pass smoothly when passing through the variable cross-section part, avoiding sudden turbulent flow and increasing noise.

[0048] Preferably, the exhaust air track extends downward in a spiral shape, and the upper end is connected to the air outlet end of the air inlet channel, and the lower end is provided with an exhaust air outlet 239. After the air enters the spiral air duct, it flows circumferentially along the spiral air duct while flowing downward axially, and finally is discharged from the exhaust air outlet. Although the radial space where the air duct is located does not change, the spiral air duct extends the exhaust air path axially within the limited radial space, and can effectively attenuate the acoustic wave energy and fully absorb the noise.

[0049] Furthermore, the number of spiral turns of the exhaust air track is greater than 1. In this solution, the number of spiral turns of the exhaust air track is optimized, and a design of 1.5 turns is adopted. As mentioned above, due to the improved layout structure, the exhaust air track is directly arranged around the outside of the cooling fan, and there is enough space to arrange and extend the path of the exhaust air track. The exhaust air track is arranged around the outside of the large cooling fan, and the number of spiral turns of the exhaust air track is greater than 1. Therefore, the exhaust air path is lengthened, the sound wave transmission is blocked, and the sound absorption area is increased. On the premise of ensuring sufficient heat dissipation, the attenuation period of the wind noise is extended, and the blown wind sound is almost exhausted. In particular, the exhaust air track located in the inner circle is directly connected to the motor, and the generated noise is surrounded by the exhaust air track in the outer circle. The noise will be further weakened by the exhaust air track in the outer circle during the outward transmission process, so that the noise reduction effect is further improved.

[0050] In addition, since the exhaust air track adopts a design of 1.5 turns, as Figure 3 shown, it is equivalent to having a half-turn inner circle exhaust air track and a full-turn outer circle exhaust air track. Since the motor exhausts air downward and then enters the inner circle exhaust air track from the outside first, flows along the half-turn inner circle exhaust air track, and then flows along the full-turn outer circle exhaust air track. Therefore, the exhaust air track is provided with an exhaust air inlet. The exhaust air inlet is provided with an air duct air inlet hole 231 on the radial outer side and an air duct air outlet hole 232 on the radial inner side, and the air duct air outlet hole 232 is connected to the inner circle exhaust air track.

[0051] As Figure 8 shown, specifically in this embodiment, the exhaust air track is designed as a 5-channel variable cross-section structure. It can be either a convex part 23021 formed by the local inner side wall 2301 protruding radially outward to form a variable cross-section structure, or a convex part 23021 formed by the local outer side wall 2302 protruding radially inward or outward to form a variable cross-section structure. The exhaust air sound is attenuated five times. Since the noise is attenuated step by step, the wind noise of the motor is greatly reduced. And through the optimized design of the cross-section and the number of spiral turns of the exhaust air track, while effectively reducing the noise, the installation structure can also be simplified. In addition, the inner side wall 2301 of the exhaust air track is circular and adapted to the outer contour of the motor, and the outer side wall 2302 is provided with a convex part 23021. The outer side wall 2302 protrudes outward so that the overall exhaust air track is in a rectangular structure. This is because from the cross-section or the top view, the horizontal projection of the base is rectangular, and the exhaust air track and the motor are both located in the rear half position. In order to adapt to the shape of the base, the outer side wall is regarded as a whole circle, and convex parts are arranged at the positions corresponding to the four corners of the square on the outer side wall. The entire exhaust air track forms an exhaust air path with a round inner and a square outer. In this way, both the convex part is formed and the shape of the base can be adapted, making full use of the internal space of the base. That is, the extension path of the exhaust air track is extended, and the circular shape of the motor itself is fully utilized, while the outer shell of the main machine assembly is mostly square in space layout, further improving the space utilization rate of the main machine assembly.

[0052] To form the air duct assembly, the air duct assembly includes an air duct 23 and an air duct cover 24. With the normal placement state of the machine as the reference direction, the air duct 23 is on the top and the air duct cover 24 is on the bottom. Specifically, the exhaust rail includes an integrally combined exhaust upper shell 234 and an exhaust lower shell 241, where the exhaust upper shell 234 is a part of the air duct 23 and the exhaust lower shell 241 is a part of the air duct cover 24. In addition, exhaust ribs for forming the side walls of the rail are provided on the opposite surfaces of the exhaust upper shell 234 and the exhaust lower shell 241, that is, an upper exhaust rib 236 protruding from the lower surface of the exhaust upper shell 234 and a lower exhaust rib 242 protruding from the upper surface of the exhaust lower shell 241. Further, the exhaust ribs on the opposite surfaces of the exhaust upper shell 234 and the exhaust lower shell 241 are provided with a concave-convex engagement structure, including a convex strip 237 provided on the upper exhaust rib 236 and a groove 243 provided on the lower exhaust rib 242. The concave-convex engagement structure prevents the air duct 23 and the air duct cover 24 from moving relative to each other during operation, increasing noise, and can be closely fitted to prevent air leakage here and increase noise.

[0053] Further, the air duct 23 and the air duct cover 24 are fixed by buckles, as Figure 3 and Figure 5 shown. At least three upper buckles 238 are provided at intervals on the inner circle of the air duct, and at least three lower buckles 244 are correspondingly provided on the inner circle of the air duct cover, and the lower buckles and the upper buckles are fixed by buckling. It can be understood that the air duct and the air duct cover can also be fixed by bolts or a combination of bolts and buckles, or can be designed as an integral structure.

[0054] To further reduce the exhaust noise, a plurality of sound-absorbing columns 233 are provided at the air outlet 239 of the exhaust rail. The sound-absorbing columns can be made of plastic material and are designed as a hollow structure, so that the transmission of sound waves is blocked, and the sound-absorbing area is increased, effectively attenuating the energy of sound waves. In addition, an air duct cotton 25 is provided inside the exhaust rail. It has good sound-absorbing effect and can effectively buffer and absorb the sound waves of the noise, thereby greatly weakening the energy of the sound waves of the noise to further improve the noise reduction effect.

[0055] As Figure 4 and Figure 9 shown, a peripheral edge 235 is provided on the upper part of the air duct 23. The peripheral edge surrounds the upper part of the motor and has a gap with the motor 26, serving as a part of the air inlet channel. In addition, the main machine assembly 2 further includes a circuit board bracket 22. The base 21 is provided with a base air inlet hole 211 and a base air outlet hole 212. The circuit board bracket is arranged on the air inlet path between the base air inlet hole and the air inlet channel. The base air outlet hole 212 is connected to the air outlet of the exhaust rail to form a complete exhaust path. The base air inlet hole 211 and the base air outlet hole 212 can be distributed in the form of honeycombs, grids, etc. to prevent foreign objects from entering.

[0056] When the machine is working, such as Figure 7 shown, the wind passes through the circuit board bracket 22 and dissipates heat from the circuit board, and then by Figure 8 and Figure 9 It can be seen that the wind then enters the upper part of the air duct 23, that is, the air inlet channel between the surrounding edge 235 and the motor 26, and then the wind continues to enter the top coil of the motor from above to start cooling the motor. The motor is working and the cooling fan 27 is rotating. Under negative pressure, the wind will blow to the lower part of the motor and finally blow out from the motor air outlet. At this time, the wind also blows to the lower part of the air duct, that is, it starts to flow on the exhaust track.

[0057] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present utility model will be included in the scope of the claims.

Claims

1. A food processor with an air duct noise reduction structure, comprising a main unit assembly and a mixing cup assembly, wherein the mixing cup assembly comprises a cup body and a mixing blade arranged in the cup body, the main unit assembly comprises a base and a motor, a cooling fan and an air duct assembly arranged in the base, the lower end of the motor shaft is connected to the cooling fan, and the motor drives the mixing blade and the cooling fan to rotate, characterized in that: The air duct assembly includes an air inlet channel that passes through the motor and dissipates heat from the motor, and an exhaust track arranged around the outside of the heat dissipation fan. The exhaust track is provided with at least two variable cross-section structures along the exhaust direction.

2. A food processor with an air duct noise reduction structure according to claim 1, characterized in that: A partial inner wall and / or outer wall of the exhaust track is provided with a protrusion protruding radially inward or outward, and the radial width of the exhaust track is changed by the protrusion, thereby forming a variable cross-section structure.

3. A food processor with an air duct noise reduction structure according to claim 2, characterized in that: The protruding portion is in an arc shape.

4. The food processing machine with an air duct noise reduction structure according to claim 1, characterized in that: The exhaust track is spirally extended from top to bottom, and the upper end is connected to the air outlet end of the air inlet channel, and the lower end is provided with an exhaust port.

5. The food processing machine with air duct noise reduction structure according to claim 4, characterized in that: The number of spiral turns of the exhaust track is greater than 1.

6. The food processing machine with an air duct noise reduction structure according to claim 1, characterized in that: The exhaust track comprises a circular inner side wall and an outer side wall with a protruding portion, and the outer side wall protrudes outward so that the exhaust track has a rectangular structure as a whole.

7. The food processing machine with an air duct noise reduction structure according to claim 1, characterized in that: The exhaust track comprises an exhaust upper shell and an exhaust lower shell which are combined into one body, and exhaust shielding ribs for forming track side walls are arranged on opposite surfaces of the exhaust upper shell and the exhaust lower shell.

8. The food processing machine with air duct noise reduction structure according to claim 7, characterized in that: The exhaust shielding ribs on the opposite surfaces of the exhaust upper shell and the exhaust lower shell are provided with a concave-convex interlocking structure; and / or, the exhaust port of the exhaust track is provided with a plurality of silencer columns; and / or, air duct cotton is provided in the exhaust track.

9. The food processing machine with an air duct noise reduction structure according to claim 1, characterized in that: The base is provided with a base air inlet and a base air outlet.

10. The food processing machine with air duct noise reduction structure according to claim 9, characterized in that: A circuit board bracket is installed in the base, and the circuit board bracket is arranged on the air inlet path between the air inlet hole of the base and the air inlet channel.

Images