Food processor with light noise

Abstract

A brushless motor is arranged on the lower portion of a cup body, a smashing device driven by the brushless motor is arranged in the cup body, the brushless motor comprises a motor body, a motor shaft, an upper end cover and a lower end cover, a smashing cutter is arranged at the upper end of the motor shaft, and a mounting cavity for containing the motor body is formed between the upper end cover and the lower end cover; the side wall of the upper end cover or the lower end cover is provided with a transverse first air outlet and an air inlet staggered with the first air outlet, the side wall of the bottom of the machine body is provided with a transverse second air outlet, the height difference between the central axis of the first air outlet and the central axis of the second air outlet is L1, the total height of the upper end cover and the lower end cover is L2, L1 is larger than or equal to 1.2 L2, and L2 is larger than or equal to 1.2 L2. A soft exhaust pipe is connected between the first air outlet and the second air outlet, and the exhaust pipe is bent at least twice to form at least two bent sections. On the premise that the brushless motor is used for noise reduction and the radial heat dissipation effect of the motor is improved, flexible noise reduction is achieved through the flexible exhaust pipe.

Description

Technical Field

[0001] The invention relates to the technical field of food processing devices, in particular to a food processing machine with low noise. Background Art

[0002] With the development of food processing machines, people gradually begin to pursue a higher quality user experience. Traditional food processing machines are often driven by series-excited motors based on product pricing restrictions and simple drive requirements. However, series-excited motors have been criticized in the market due to a variety of problems, such as large fluctuations in motor transmission efficiency, low axial heat dissipation efficiency, large base size, and obvious noise. There are many structural optimizations in the existing technical field, such as sound insulation covers, shock-absorbing pads, noise reduction cotton, heat dissipation ducts and other different types of technical innovations, but due to the limitations of the motor's own properties, they have not been able to achieve obvious noise reduction, heat dissipation or miniaturization effects, and there are even fewer products that can solve the above problems at the same time.

[0003] In order to solve the problem that the series-excited motors mentioned above are still noisy and occupy a large space when used in food processing machines, some researchers later used brushless motors to replace series-excited motors. Although brushless motors have advantages over series-excited motors, such as small size, low noise, and forward and reverse rotation, the replacement of brushless motors alone still cannot meet consumers' increasing demand for low noise. Therefore, some researchers have considered noise reduction solutions from other directions to improve the user experience.

[0004] For example, the patent with application number 201710720155.6 discloses an electrical noise reduction and heat dissipation host and a wall breaking machine. The air duct side cover assembly is arranged to define an air duct with the motor cover. The left air duct cover plate and the left air duct groove define the left air duct, and the right air duct cover plate and the right air duct groove define the right air duct. The air duct is a hard air duct, and silencer cotton is arranged in the air duct to reduce the noise generated during the vibration of the motor when it rotates at high speed. Moreover, an upper motor cover and an upper motor sealing ring need to be arranged above the left and right air ducts, and an air duct bottom cover assembly needs to be arranged below the motor. The air duct bottom cover assembly includes an upper air duct cover and a lower air duct cover adapted to be assembled, and an air duct sealing ring located between the upper air duct cover and the lower air duct cover. Therefore, although this solution has a certain noise reduction effect, on the one hand, the entire air duct has many accessories and is complex to install, and it is necessary to consider the assembly and sealing between the left and right air duct grooves, the left and right air duct cover plates, the upper motor cover, and the air duct bottom cover components; on the other hand, since the air duct is around the outer periphery of the motor, the air duct space is very small, and the silencer cotton needs to be installed in this space, which will inevitably increase the assembly steps and assembly difficulty. In addition, since the air duct has a tortuous path, the silencer cotton cannot fit well on the inner wall of the air duct, nor can it cover all the inner walls of the air duct, and the noise reduction effect is not very good. In addition, since the heat dissipation cavity of the motor extends along the axial direction, the heat generated in the radial direction of the motor is not fully contacted, so it is difficult to play a good carrying role, and naturally it is difficult to improve the heat dissipation performance of the stator winding in the radial direction. To put it another way, since the air inlet channel is arranged around the outer periphery of the motor, the heat dissipation direction of the motor is from top to bottom. If a technician in this field replaces the motor with a brushless motor and sets the first air outlet on the side wall of the brushless motor, it is necessary to close the air outlet at the bottom of the housing, and then open a second air outlet connected to the first air outlet of the motor on the side wall of the housing. In this way, it is also necessary to change the air inlet channel to avoid the second air outlet, and add an air guide structure between the first air outlet and the second outlet. The wind entering from the top of the motor is chaotic and will hit the inner side of the brushless motor, which will increase the noise.

[0005] Another example is the patent No. 201420352840.X, which discloses a vacuum cleaner with a motor suspension fixed structure, in which a flexible air duct is set between the air outlet of the dust box and the air intake of the motor to separate the dust box and the motor, so as to prevent the motor from vibrating directly through the rigid air duct and causing numbness when touching the outer surface of the vacuum cleaner. However, this solution does not consider how to set the flexible air duct so as to effectively reduce the wind speed noise generated when the wind generated by the motor passes through the flexible air duct.

[0006] For example, the patent with application number 201520258649.3 discloses a retractable wind shield mechanism and a container equipped with the retractable wind shield mechanism. The wind shield is installed on the fixed frame of the wind shield of the container. During transportation, the wind shield can be retracted and hidden inside the machine. At the project site, the wind shield is pulled out from the inside of the machine to facilitate transportation and use. Under this solution, how to set a flexible wind shield to reduce the noise of the container is not considered.

[0007] The applicant has applied brushless motors to food processors earlier, and initially applied them to flattened food processors, in order to solve the problem that the solution of the motor axial heat dissipation cavity in the prior art is difficult to solve the heat dissipation effect of the motor as a whole, especially the heat dissipation effect of the motor in the radial direction. The applicant has disclosed a patent with patent number 202110173563.0, namely a flattened food processor, which reduces the center of gravity and noise of the food processor by adopting a brushless motor. On this basis, the heat dissipation cavity inlet and outlet are respectively located on the side wall of the motor, and the inlet and outlet are arranged relative to each other. Not only does the heat dissipation cavity extend radially to guide the air to flow through the stator winding radially, but also the air is fully in contact with the heat generated in the radial direction of the stator winding, so as to play a good carrying role, so that the stator winding has good heat dissipation performance in the axial direction. However, due to the particularity of the flattened base structure of the base, that is, the motor is located in the rear area of ​​the base, and an operating interface is provided on the front side of the base, so that the gap between the outlet of the heat dissipation cavity and the side wall of the base is very small, and it is difficult to add other noise reduction structures.

[0008] In order to further solve the drawbacks of unstable airflow and high wind noise of the centrifugal fan when reversing in the lateral wind guidance mode of the flat shell of the brushless variable frequency motor, the applicant disclosed a brushless motor with good noise reduction effect in 2023, with patent number CN202320044306.1. A centrifugal fan is used inside the brushless motor, and the centrifugal force accelerates the airflow to be thrown out laterally, which can better promote the wind guidance efficiency of the lateral air inlet and outlet. On this basis, the rotor assembly drives the centrifugal fan to rotate in the opposite direction through reverse drive. The side wall of the upper shell is provided with an air inlet, and the side wall of the lower shell is provided with an air outlet for concentrated air outlet. The air outlet is arranged radially opposite to the centrifugal fan, and the height of the blade part of the centrifugal fan is overlapped in the axial direction.

[0009] In summary, the above-mentioned prior arts have not considered how to set a flexible air duct to reduce the noise impact caused by the wind flow generated by the brushless motor and improve the user experience in the field of food processing machines, under the premise of improving the radial heat dissipation effect of the brushless motor. Summary of the invention

[0010] The object of the present invention is to provide a food processing machine with low noise, aiming at solving the problem of how to set a flexible air duct structure to reduce the wind noise when the brushless motor is working, under the premise that a brushless motor is used and the air inlet and outlet of the brushless motor are both located on the side wall of the end cover to improve the radial heat dissipation effect of the brushless motor in the field of food processing machines.

[0011] To achieve the above-mentioned purpose, the present invention provides a low-noise food processing machine, the machine body includes a brushless motor arranged at the lower part of a cup body, a crushing knife driven by the brushless motor is arranged in the cup body, the brushless motor includes a motor body, a motor shaft arranged on the motor body, an upper end cover and a lower end cover, the crushing knife is arranged at the upper end of the motor shaft, a mounting cavity for accommodating the motor body is formed between the upper end cover and the lower end cover, a horizontally placed first air outlet and an air inlet arranged offset from the first air outlet are arranged on the side wall of the upper end cover or the lower end cover, a horizontally placed second air outlet is arranged on the bottom side wall of the machine body, the height difference between the central axis of the first air outlet and the central axis of the second air outlet is L1, the total height of the upper end cover and the lower end cover is L2, wherein L1≥1.2L2, a soft exhaust duct is connected between the first air outlet and the second air outlet, and the exhaust duct is bent at least twice to form at least two bent sections.

[0012] In the food processing machine of the present application, a brushless motor is used to replace the existing series-excited motor. Compared with the series-excited motor, the brushless motor is smaller in size and lower in noise. Since the wind flow generated by the brushless motor when working will be thrown from the center to the surrounding sides of the upper and lower end covers along with the centrifugal fan blades, the upper end cover and the lower end cover constitute the entire end cover. Therefore, in the present application, a horizontally placed first air outlet and an air inlet offset from the first air outlet are also provided on the side wall of the upper end cover or the lower end cover. On the one hand, the first air outlet allows the wind flow brought by the rotation of the centrifugal fan blades to be thrown out higher, thereby improving the heat dissipation speed and efficiency inside the brushless motor; on the other hand, the air inlet and the first air outlet are both provided on the side wall of the end cover, so as to achieve full contact between the air and the heat generated radially by the motor body (such as accessories including windings), thereby improving the radial heat dissipation effect of the motor body. On this basis, in order to extend the length of the exhaust duct as much as possible, a second horizontal air outlet is set on the bottom side wall of the body, and the height difference between the central axis of the first air outlet and the central axis of the second air outlet is L1, and the distance between the upper end surface of the upper end cover and the lower end surface of the lower end cover is L2, wherein L1≥1.2L2, so that the first air outlet and the second air outlet can form a height difference, which can extend the vertical length of the exhaust duct, that is, extend the propagation path of the wind coming out of the first air outlet, and achieve noise reduction. At the same time, it is avoided that when the first air outlet and the second air outlet are at the same height, the exhaust duct can only extend a small distance horizontally. The exhaust duct adopts a flexible material that is conducive to bending to form an exhaust duct with multiple bending sections. Through the setting of multiple bending sections, the sound waves generated by the wind coming out of the first air outlet can be continuously blocked and weakened in the bending section, and the transmission speed of the sound waves can be slowed down, thereby reducing the exhaust noise, so that the wind noise of the knife felt by the user will be lower, achieve a good light sound effect, and improve the user experience.

[0013] Furthermore, the central axis of the first air outlet and the central axis of the second air outlet are arranged to cross each other in the vertical direction, so that the exhaust pipe is bent in at least two different directions.

[0014] By setting the central axis of the first air outlet and the central axis of the second air outlet to intersect each other in the vertical direction, the exhaust pipe at least first bends downward and then bends horizontally toward the second air outlet; or the exhaust pipe first bends horizontally to the top of the second air outlet and then bends downward to connect with the second air outlet. In either case, the exhaust pipe must be bent at least twice to bend and extend the transmission path of the sound wave, thereby achieving a good noise reduction effect.

[0015] Furthermore, an inner base is provided below the lower end cover, one end of the inner base is connected to the bottom surface of the machine body, and the other end is fixedly connected to the upper end cover or the lower end cover, and an accommodating cavity for accommodating the exhaust pipe is formed between the outer wall of the inner base and the inner wall of the machine body.

[0016] Since the brushless motor is small in size, especially the height of the axial direction is greatly flattened, in order not to change the shape of the original body, the expensive cost of re-molding is saved. In the present application, by setting a base inner seat inside the base, the brushless motor is supported and fixed by the base inner seat, so as to achieve the installation stability of the brushless motor in the body. At the same time, a receiving cavity for accommodating the exhaust pipe is formed between the outer wall of the base inner seat and the inner wall of the body, and a receiving space is reserved for the exhaust pipe through the base inner seat, and there is no need to set additional components to form the receiving cavity, so the structure is simpler.

[0017] Furthermore, the inner seat of the machine base extends upward to surround the first air outlet, and a side wall of the inner seat of the machine base is provided with an air duct outlet for the exhaust pipe to pass through.

[0018] Since the air velocity at the first air outlet is relatively fast, the radial force on the upper and lower end covers of the brushless motor is also the largest, which is one of the core factors causing the radial shaking of the brushless motor. Therefore, in order to further improve the installation stability of the brushless motor and the inner seat of the base, in this solution, by extending the inner seat of the base upward to surround the first air outlet, the height of the axial overlapping plug-in fit between the inner seat of the base and the brushless motor is increased as much as possible, thereby improving the reliability of the radial limitation of the brushless motor by the inner seat of the base. At the same time, since the exhaust duct is connected to the first air outlet, in order to facilitate the exhaust duct to pass through the accommodation cavity and connect with the second air outlet, it is necessary to provide an air duct outlet for the exhaust duct to pass through on the side wall of the inner seat of the base.

[0019] Further, the air duct outlet supports the exhaust pipe;

[0020] Alternatively, the inner seat of the machine base is polygonal, and the inner seat of the machine base includes a plurality of connected side walls, and the first air outlet is located at the connection between two adjacent side walls.

[0021] In order to prevent the exhaust pipe from falling down due to its own gravity and becoming disconnected from the first air outlet, an air duct outlet is provided to support the exhaust pipe, thereby reducing the risk of the exhaust pipe tilting and sliding down.

[0022] In another embodiment, the inner base of the machine base is set to be polygonal, and the inner base of the machine base includes a plurality of connected side walls, and the first air outlet is located at the connection of two adjacent side walls, so that the first air outlet forms a corner outlet, which facilitates the connection of the exhaust pipe to the first air outlet. The connection of the two adjacent side walls is stronger, and if the exhaust pipe touches the connection, the support effect of the exhaust pipe is better.

[0023] Furthermore, the food processor further comprises a pulp discharge pipe connected to the cup body, a liquid receiving cup is provided below the pulp discharge pipe, the inner seat of the machine base is located between the liquid receiving cup and the exhaust pipe, the top view direction of the food processor comprises a long axis direction extending laterally, and the liquid receiving cup, the inner seat of the machine base and the exhaust pipe are sequentially arranged along the long axis direction;

[0024] Alternatively, the accommodating cavity and the exhaust pipe are clearance-matched;

[0025] Alternatively, the food processing machine further comprises a water tank and a water tank mounting frame for mounting the water tank, and the accommodating cavity is located between the inner seat of the machine base and the water tank mounting frame.

[0026] We know that when using a food processor, users often place the food processor in a direction where the liquid receiving cup faces the user, so as to facilitate taking the liquid receiving cup. Therefore, in order to prevent the liquid receiving cup from being too close to the exhaust pipe and causing the wind noise in the exhaust pipe to be closer to the user, the liquid receiving cup and the exhaust pipe are separated by the inner seat of the machine base. At the same time, in order to further lengthen the distance between the exhaust pipe and the liquid receiving cup, the food processor is arranged to include a long axis direction extending laterally from a top view, and the liquid receiving cup, the inner seat of the machine base and the exhaust pipe are arranged in sequence along the long axis direction.

[0027] In another implementation scheme, in order to avoid contact between the exhaust duct and the cavity wall of the accommodating cavity, which would cause the exhaust duct to generate vibrations that would be transmitted to the cavity wall of the exhaust duct, that is, to the inner seat of the base and the side walls of the body, causing numbness in the user's hands when using it, a clearance is provided between the accommodating cavity and the exhaust duct.

[0028] In another implementation scheme, by setting a water tank, water can be automatically added when making food, the food processor is more intelligent, and the success rate of the user's making is higher. On this basis, a water tank mounting frame is set to be used to install the water tank outward, and the water tank mounting frame is used to enclose the inner seat of the machine base to form a receiving cavity, so that the water tank mounting frame is used for two purposes and saves costs.

[0029] Furthermore, the first air outlet is located on the lower end cover, and the lower end cover is further provided with a protrusion protruding from the side wall of the lower end cover at the first air outlet, the interior of the protrusion is hollow to extend the air outlet path of the first air outlet, and one end of the exhaust pipe is sleeved and matched with the protrusion;

[0030] Alternatively, the central axis of the first air outlet is at a height of 10 cm to 18 cm from the central axis of the second air outlet;

[0031] Alternatively, the lateral distance between the first air outlet and the second air outlet along the axial direction of the first air outlet is between 35-45 mm;

[0032] Alternatively, a support frame for supporting the exhaust duct is provided inside the exhaust duct;

[0033] Alternatively, the exhaust duct includes a spirally wrapped section, and the spirally wrapped section is arranged to extend obliquely downward.

[0034] In one solution of the present application, a raised portion protruding from the side wall of the lower end cover is provided at the first air outlet by providing a lower end cover, the raised portion is hollow inside to extend the air outlet path of the first air outlet, and the wind flow generated inside the brushless motor is first guided out through the raised portion. One end of the exhaust duct is sleeved with the raised portion, and the exhaust duct is conveniently connected to the first air outlet through the raised portion. If there is no raised portion, the exhaust duct needs to be inserted into the air inlet for installation, and the exhaust duct is prone to interfere with the motor body.

[0035] In another embodiment, the plumb bob height of the center axis of the first air outlet from the center axis of the second air outlet is set to be between 10 cm and 18 cm, so that the exhaust pipe can have a longer length to extend the exhaust path length. When the plumb bob height of the center axis of the first air outlet from the center axis of the second air outlet is greater than 18 cm, the center of gravity of the brushless motor will be too high, which will reduce the working stability of the whole machine. When the plumb bob height of the center axis of the first air outlet from the center axis of the second air outlet is greater than 10 cm, the total length of the exhaust pipe will be limited, thereby affecting the reduction of wind noise.

[0036] In another embodiment, the lateral distance between the first air outlet and the second air outlet along the axial direction of the first air outlet is between 35-45 mm, so as to provide the exhaust pipe with a lateral extension space, which helps to extend the total length of the exhaust pipe, thereby lengthening the propagation path of the wind noise, weakening the energy of the wind, and achieving the effect of noise reduction. Moreover, the large lateral space can reduce the probability of the exhaust pipe touching the inner seat of the base and the side wall of the body.

[0037] Alternatively, in another implementation, a support frame is provided inside the exhaust duct to support the exhaust duct, thereby preventing the flexible exhaust duct from closing when it is bent, ensuring that hot air can be smoothly discharged out of the body, thereby improving the heat dissipation effect of the brushless motor.

[0038] Alternatively, in another embodiment, the exhaust duct includes a spiral wrapping section, and the spiral wrapping section is provided to extend the length of the exhaust duct and change the tortuosity of the exhaust air to achieve a noise reduction effect. Moreover, the spiral wrapping section is arranged to extend downwardly and gradually approach the second air outlet.

[0039] Furthermore, along the direction from the first air outlet to the second air outlet, the exhaust duct includes a first extension section, a first bending section, a second extension section, a second bending section, a third extension section, a third bending section and a fourth extension section, the first extension section extends outward along the central axis direction of the first air outlet, one end of the second extension section is bent laterally relative to the first extension section to form a first bending section therebetween, one end of the third extension section is bent vertically downward relative to the other end of the second extension section to form a second bending section therebetween, one end of the fourth extension section is bent laterally relative to the other end of the third extension section to form a third bending section therebetween, and the other end of the fourth extension section is connected to the second air outlet.

[0040] In the present application, by setting a first extension section extending outward along the central axis direction of the first air outlet at the first air outlet, the wind from the first air outlet does not change to flow rapidly to the first extension section along the central axis direction of the first air outlet. In this process, since the flow direction of the wind from the first air outlet is not changed, the flow rate of the wind can be increased. After the hot air flows rapidly into the first extension section, one end of the second extension section is set to bend horizontally relative to the first extension section to form a first bending section between the two, so as to achieve the conversion of the flow path of the hot air, so that the hot air flexibly collides and weakens in the first bending section to reduce the noise of the wind flow. Then, after the flexible weakening effect of the first bending section, in order to accelerate the heat dissipation efficiency, a second extension section is set. Then, one end of the third extension section is bent vertically downward relative to the other end of the second extension section to form a second bending section between the two, so that the second bending section performs a secondary flexible collision and weakening on the wind coming out of the second extension section to reduce the noise of the wind flow for a second time. The third extension section is bent vertically downward, on the one hand to further extend the exhaust path of the exhaust duct, and on the other hand to get closer to the second air outlet. Then, by bending laterally at one end of the fourth extension section relative to the other end of the third extension section to form a third bending section between the two, the third bending section performs three flexible collisions and weakening on the wind coming out of the third extension section to reduce the noise of the wind flow again. The fourth extension section is connected to the second air outlet, and can quickly guide the wind that has undergone this flexible collision and weakening out of the second air outlet, which can not only give the user a sense of light sound, but also quickly guide the wind and improve the heat dissipation efficiency. This solution achieves a good noise reduction effect through multiple cycles of "rapid air guidance-flexible collision, weakening", and at the same time will not delay the heat dissipation efficiency.

[0041] Furthermore, the exhaust pipe is provided with a diameter-changing section, and the diameter-changing section is provided between two adjacent bending sections.

[0042] The two bending sections are used to continuously change the direction of the wind flow, and a diameter-changing section is arranged between the two bending sections, so that when the wind flows through the diameter-changing section, the wind pressure will be gathered when it encounters a narrower diameter part, and the wind pressure will be released when it encounters a wider diameter part, thereby reducing the whistling sound of the wind.

[0043] Furthermore, the side wall of the variable diameter section is corrugated;

[0044] Alternatively, the diameter-changing section may be telescopically arranged along the axial direction of the diameter-changing section.

[0045] In one scheme, the side wall of the variable diameter section is corrugated. On the one hand, the corrugated variable diameter section is conducive to the extension or contraction of the exhaust duct; on the other hand, when the sound wave passes through the variable diameter section, the propagation direction of the sound wave can be continuously changed by corrugations of different directions, and the energy of the sound wave will be weakened when the sound wave collides with the corrugated surface. Such continuous changing of direction and weakening of the sound wave is conducive to reducing wind noise.

[0046] In another solution, the variable diameter section can be extended and retracted along the axial direction of the variable diameter section, so that we can reasonably extend or contract to adapt to the body according to the size of the body space, and the adaptability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0048] Figure 1 is a cross-sectional view of a food processing machine according to an embodiment of the present invention;

[0049] Figure 2 It is a structural schematic diagram of an upper end cover of a brushless motor in one embodiment of the present invention;

[0050] Figure 3 It is a schematic structural diagram of a lower end cover of a brushless motor in one embodiment of the present invention;

[0051] Figure 4 It is a schematic diagram of the structure of the inner base of the base in one embodiment of the present invention;

[0052] Figure 5 It is a schematic diagram of the structure of a machine body in an upward direction according to an embodiment of the present invention;

[0053] Figure 6 A cross-sectional view of a food processing machine showing one side of the exhaust duct in one embodiment of the present invention;

[0054] Figure 7 for Figure 6 a cross-sectional view of the other side;

[0055] Figure 8 A cross-sectional view of a food processing machine in one embodiment of the present invention when the first air outlet and the second air outlet are visible;

[0056] Fig. 9 A top view of a food processor in one embodiment of the present invention when the first air outlet and the second air outlet are visible;

[0057] Fig.10 This is a schematic diagram of the structure of an exhaust duct in one embodiment of the present invention;

[0058] Fig.11 It is a schematic structural diagram of an exhaust duct in another embodiment of the present invention;

[0059] Fig.12 It is a structural schematic diagram of an exhaust duct having a corrugated variable diameter section in another embodiment of the present invention;

[0060] Fig.13 for Fig.12 The corresponding cross-sectional view of the exhaust duct.

[0061] Description of reference numerals:

[0062] 1. Machine body; 11. Brushless motor; 111. Upper end cover; 1111. Air inlet; 112. Lower end cover; 1121. First air outlet; 1122. Raised part; 1123. Stop rib; 113. Motor shaft; 12. Heating plate; 13. Cup body; 131. Crushing knife; 132. Discharge pipe; 14. Water tank mounting frame; 15. Water tank; 16. Liquid receiving cup; 17. Residual water box; 2. Inner base of machine base; 21. Air duct outlet; 22. Support column; 3. Second air outlet; 31. Stop rib; 4 , exhaust duct; 41, hard pipe; 42, hose; 421, reducing section; 422, fitting section; 4221, anti-drop buckle; 4222, inlet; 43, air inlet section; 44, transition section; 45, buffer section; 46, shrinkage section; 47, pressure relief section; 48, bending section; 481, first bending section; 482, second bending section; 483, third bending section; 49, extension section; 491, first extension section; 492, second extension section; 493, third extension section; 494, fourth extension section. DETAILED DESCRIPTION

[0063] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0064] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0065] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] The present application provides a food processing machine with low noise, referring to Figures 1 to 13 The food processor comprises a machine body 1 and a cup body 13 arranged on the machine body 1. The machine body 1 comprises a brushless motor 11 arranged at the lower part of the cup body 13. A crushing knife 131 driven by the brushless motor 11 is arranged in the cup body 13. The brushless motor 11 comprises a motor body, a motor shaft 113 arranged on the motor body 13, an upper end cover 111 and a lower end cover 112. The crushing knife 131 is arranged at the upper end of the motor shaft 113. An installation cavity for accommodating the motor body is formed between the upper end cover 111 and the lower end cover 112. In this scheme, the crushing knife 131 is driven by the brushless motor 11, and the crushing knife 131 rotates in the cup body 13 to crush the food. In this scheme, the brushless motor 11 is used to replace the existing series-excited motor, which is smaller in size and lower in noise than the series-excited motor body 1. Of course, the food processor often needs to make some delicacies that need to be heated, such as soy milk, fish soup, etc. For this purpose, a heating plate 12 can also be arranged at the bottom of the cup body 13 to meet the heating requirements of the food. In a preferred embodiment, reference is made to Figure 2 In order to integrate and simplify the installation structure of the brushless motor 11, the heating plate 12 and the upper end cover 111 can also be integrally formed into one piece, or integrally injection molded into one piece. In the present invention, whether the food processor has the heating plate 12 and the fixing method of the heating plate 12 and the upper end cover 111 are not specifically limited.

[0067] In the food processing machine of the present application, a brushless motor 11 is used to replace the existing series-excited motor, which is smaller in size and lower in noise than the series-excited motor. Since the wind flow generated by the brushless motor when working will be thrown from the center to the peripheral side of the upper and lower end covers along with the centrifugal fan blades, the upper end cover and the lower end cover constitute the entire end cover. In the present application, a horizontally placed first air outlet 1121 and an air inlet 1111 staggered with the first air outlet 1121 are also provided on the side wall of the upper end cover or the lower end cover. On the one hand, the first air outlet 1121 allows the wind flow brought by the rotation of the centrifugal fan blades to be thrown out higher, thereby improving the heat dissipation speed and efficiency inside the brushless motor 11; on the other hand, the air inlet 1121 and the first air outlet 1111 are both provided on the side wall of the end cover, so as to achieve full contact between the air and the heat generated radially by the motor body 13 (for example, including accessories such as windings), thereby improving the radial heat dissipation effect of the motor body 13, that is, improving the radial heat dissipation effect of the brushless motor.

[0068] Specifically, in a preferred embodiment, reference is made to Figure 2 and Figure 3 , an air inlet 1111 is provided on the side wall of the upper end cover 111, and a horizontally placed first air outlet 1121 is provided on the side wall of the lower end cover 112. The centrifugal fan blades of the brushless motor 11 are arranged on the side close to the lower end cover 112, so that the cold wind coming in from the air inlet 1111 is thrown from the center to the peripheral sides of the upper and lower end covers 112 along with the centrifugal fan blades, and discharged from the first air outlet 1121, so that the wind flow brought by the rotation of the centrifugal fan blades can be thrown out more efficiently, and the heat dissipation speed and efficiency inside the brushless motor 11 are improved. Since the lower end cover 112 is arranged closer to the fan blades, the centrifugal force near the lower end cover 112 is greater than that at the lower end cover 112, so it is more conducive to the discharge of wind to arrange the first air outlet 1121 at the lower end cover 112. It can be understood that since the brushless motor 11 is relatively flat, that is, the centrifugal force difference between the upper and lower end covers 112 is not particularly large, the first air outlet 1121 can also be arranged on the upper end cover 111. In other words, the horizontally placed first air outlet 1121 in the present application is disposed on the side wall of the upper end cover 111 or the lower end cover 112 .

[0069] It should be noted that the horizontally placed first air outlet and the horizontally placed second air outlet described in the present invention are considered horizontally placed as long as the angle between the central axis of the first air outlet and the horizontal plane is less than 80 degrees, and the angle between the central axis of the second air outlet and the horizontal plane is less than 80 degrees. Preferably, the horizontal placement is that the angle between the central axis of the first air outlet and the horizontal plane is 0 degrees, and the angle between the central axis of the second air outlet and the horizontal plane is 0 degrees.

[0070] On this basis, reference Figure 1 as well as Figures 5 to 8In order to extend the length of the exhaust pipe 4 as much as possible, a horizontally placed second air outlet 3 is provided on the bottom side wall of the machine body 1, and the height difference between the central axis of the first air outlet 1121 and the central axis of the second air outlet 3 is L1, and the distance between the upper end surface of the upper end cover 111 and the lower end surface of the lower end cover 112 is L2, that is, the total height of the upper end cover 111 and the lower end cover 112 is L2, wherein L1≥1.2L2, so that the first air outlet 1121 and the second air outlet 3 can form a height difference, which can extend the vertical length of the exhaust pipe 4, that is, extend the propagation path of the wind coming out of the first air outlet 1121, and achieve noise reduction. At the same time, it is avoided that when the first air outlet 1121 and the second air outlet 3 are at the same height, the exhaust pipe 4 can only extend a small distance horizontally. The exhaust duct 4 is made of flexible material which is convenient for bending to form an exhaust duct 4 with multiple bending sections 48. Through the arrangement of the multiple bending sections 48, the sound waves generated by the wind coming out of the first air outlet 1121 can be continuously blocked and weakened in the bending sections 48, and the transmission speed of the sound waves can be slowed down, thereby reducing the exhaust noise, so that the wind noise of the knife felt by the user will be lower, achieving a good low-noise effect, and improving the user experience.

[0071] It should be noted that the exhaust pipe 4 can be made of a hose 42 structure such as silicone, plastic bellows, hardware bellows, threaded pipe, etc., so that the exhaust pipe 4 can be bent. There is no specific limitation on whether the motor body 13 between the upper end cover and the lower end cover is exposed. For example, the stator of the motor body can also be partially exposed to improve the heat dissipation effect.

[0072] It should also be noted that in this embodiment, there is no specific limitation on whether the food processor has a water tank 15, that is, the food processor can be an ordinary wall-breaking machine, a soybean milk machine, or a soybean milk machine or a wall-breaking machine without hand washing, which is limited only under a specific embodiment. In addition, the first air outlet 1121 and the air inlet 1111 are staggered, including that the first air outlet 1121 and the air inlet 1111 are both located on the side wall of the end cover, but the two are arranged oppositely; or, the air inlet 1111 is arranged at the top of the end cover, and the first air outlet 1121 is arranged on the side wall of the end cover, and how the staggered arrangement is specifically arranged is not specifically limited.

[0073] In one embodiment of the present invention, reference is made to Fig. 9 The central axis of the first air outlet 1121 and the central axis of the second air outlet 3 are arranged to intersect each other in the vertical direction, so that the exhaust pipe 4 is bent in at least two different directions. The vertical intersecting arrangement means that, in the top view of the food processor, the central axis of the first air outlet 1121 and the central axis of the second air outlet 3 are arranged to intersect each other.

[0074] By arranging the central axis of the first air outlet 1121 and the central axis of the second air outlet 3 to intersect each other in the vertical direction, the exhaust pipe 4 at least first bends downward and then bends laterally toward the second air outlet 3; or, the exhaust pipe 4 first bends laterally to the top of the second air outlet 3 and then bends downward to connect with the second air outlet 3. In either case, the exhaust pipe 4 must be bent at least twice to bend and extend the transmission path of the sound wave, thereby achieving a good noise reduction effect.

[0075] It can be understood that, in a preferred embodiment, the central axis of the first air outlet 1121 and the central axis of the second air outlet 3 are arranged at right angles in the top view direction. Fig. 9 , the food processor is viewed from the top view, including the long axis direction extending laterally (i.e., Fig. 9 The X-axis in the figure), and the short axis direction perpendicular to the long axis direction (reference Fig. 9 The first air outlet 1121 extends along the Y-axis direction, and the second air outlet 3 extends along the X-axis direction.

[0076] In one embodiment of the present invention, reference is made to Figure 3 , the first air outlet 1121 is located on the lower end cover 112, and the lower end cover 112 is also provided with a protrusion 1122 protruding from the side wall of the lower end cover 112 at the first air outlet 1121, and the interior of the protrusion 1122 is hollow to extend the air outlet path of the first air outlet 1121, and one end of the exhaust pipe 4 is sleeved with the protrusion 1122. Specifically, a limiting rib 1123 is provided on the outer surface of the protrusion 1122, and the exhaust pipe 4 is sleeved outside the protrusion 1122, and the limiting rib 1123 is interference-fitted with the inner surface of the exhaust pipe 4 to achieve a reliable connection between the protrusion 1122 and the exhaust pipe 4. Alternatively, a buckle is protruding from the outer surface of the protrusion 1122, and a groove or a through hole matching with the buckle is provided on the side wall of the exhaust pipe 4. When the buckle is engaged with the groove or the through hole, a reliable connection between the protrusion 1122 and the exhaust pipe 4 is achieved.

[0077] Therefore, in this solution, by setting the lower end cover 112, a protrusion 1122 protruding from the side wall of the lower end cover 112 is also provided at the first air outlet 1121. The interior of the protrusion 1122 is hollow to extend the air outlet path of the first air outlet 1121, and the wind flow generated inside the brushless motor 11 is first guided out through the protrusion 1122. One end of the exhaust pipe 4 is sleeved with the protrusion 1122, and the exhaust pipe 4 is conveniently connected to the first air outlet 1121 through the protrusion 1122. If there is no protrusion 1122, the exhaust pipe 4 needs to be inserted into the air inlet 1111 for installation, and the exhaust pipe 4 is easy to interfere with the motor body.

[0078] It is understandable that the exhaust pipe 4 and the protrusion 1122 can also be reliably connected by bundling with a rolling strip, that is, the exhaust pipe 4 is first sleeved on the outside of the protrusion 1122, and then the two are tightly tied with a rolling strip.

[0079] It should be noted that, in a preferred implementation scheme, the protrusion 1122 extends in a tangential direction relative to the outer periphery of the lower end cover 112, so that the wind energy thrown onto the lower end cover by centrifugal action can be thrown out along the protrusion without changing the wind direction, thereby speeding up the wind outlet efficiency; or, the protrusion 1122 extends radially outward along the lower end cover 112, which can change the wind direction, weaken the wind energy, and achieve a noise reduction effect.

[0080] Since the brushless motor 11 is relatively small in size, especially the height of the axial direction is greatly flattened, in order not to change the shape of the original motor 1, the expensive cost of re-molding is saved. Figure 1 and 4 , a base inner seat 2 is provided below the lower end cover 112, one end of the base inner seat 2 is connected to the bottom surface of the machine body 1, and the other end is fixedly connected to the upper end cover 111 or the lower end cover 112, and a receiving cavity for accommodating the exhaust pipe 4 is formed between the outer wall of the base inner seat 2 and the inner wall of the machine body 1. Specifically, a screw column hole protruding radially outward is provided on the base inner seat 2, and a mounting hole corresponding to the screw column hole is provided on the upper end cover 111 or the lower end cover 112. The screw passes through the screw column hole and the mounting hole in sequence to achieve a fixed connection between the base inner seat 2 and the brushless motor 11. By providing the base inner seat 2 inside the machine base, the brushless motor 11 is supported and fixed by the base inner seat 2, and the installation stability of the brushless motor 11 in the machine body 1 is achieved. At the same time, an accommodating cavity for accommodating the exhaust pipe 4 is formed between the outer wall of the base inner seat 2 and the inner wall of the body 1. The base inner seat 2 also reserves accommodating space for the exhaust pipe 4. There is no need to set up additional components to form the accommodating cavity, and the structure is simpler.

[0081] It should be noted that one end of the base inner seat 2 is connected to the bottom surface of the body 1, and the bottom of the base inner seat 2 can be directly in contact with the inner bottom surface of the body 1; or, a plurality of support columns 22 are provided on the bottom surface of the base inner seat 2, and the support columns 22 are in contact with the inner bottom surface of the body 1 to reduce the contact area between the base inner seat 2 and the inner bottom surface of the body 1, thereby reducing wear. Of course, in order to reduce the movement noise between the support columns 22 and the inner bottom surface of the body 1, the support columns 22 can also be set as soft parts, such as silicone parts.

[0082] Further, in a preferred embodiment, referring to Figure 4, the base inner seat 2 extends upward to at least surround the first air outlet 1121, and the side wall of the base inner seat 2 is provided with an air duct outlet 21 for the exhaust pipe 4 to pass through. Since the flow rate of the air outlet at the first air outlet 1121 is relatively fast, the radial force on the upper and lower end covers 112 of the brushless motor 11 is also the largest, which is one of the core factors causing the radial shaking of the brushless motor 11. Therefore, in order to further improve the installation stability of the brushless motor 11 and the base inner seat 2, in this solution, by extending the base inner seat 2 upward to surround the first air outlet 1121, the height of the axial overlapping plug-in fit between the base inner seat 2 and the brushless motor 11 is increased as much as possible, thereby improving the reliability of the radial limitation of the brushless motor 11 by the base inner seat 2. At the same time, since the exhaust duct 4 is connected to the first air outlet 1121, in order to facilitate the exhaust duct 4 to pass through the accommodation cavity and connect with the second air outlet 3, an air duct outlet 21 for the exhaust duct 4 to pass through must be provided on the side wall of the base inner seat 2. It should be noted that, in a specific implementation plan, if the first air outlet 1121 is provided on the side wall of the lower end cover 112, the base inner seat 2 extends upward to at least cover the lower end cover 112, and there is no limitation on whether the lower end cover 112 is completely covered, as long as it is guaranteed to cover the first air outlet 1121; if the first air outlet 1121 is provided on the side wall of the upper end cover 111, the base inner seat 2 extends upward to at least cover the upper end cover 111, and there is no limitation on whether the upper end cover 111 is completely covered, as long as it is guaranteed to cover the first air outlet 1121.

[0083] In one embodiment of the present invention, reference is made to Figure 7 In order to prevent the exhaust pipe 4 from falling down due to its own gravity and being disconnected from the first air outlet 1121, the air duct outlet 21 is provided to support the exhaust pipe 4, thereby reducing the risk of the exhaust pipe 4 tilting and sliding down. It is not limited here whether the exhaust pipe 4 is soft in its entirety or partially soft.

[0084] It can be understood that when the exhaust duct 4 includes two connected hard tubes 41 and a soft tube 42, and the hard tube 41 is connected to the first air outlet 1121, due to the high hardness of the hard tube 41, it is not easily deformed by the influence of gravity after being connected to the first air outlet 1121. In this case, the hard tube 41 part of the exhaust duct 4 can also be arranged to fit with the air duct outlet 21 with a gap.

[0085] In one embodiment of the present invention, the base inner seat 2 is set to be polygonal, the base inner seat 2 includes a plurality of connected side walls, and the first air outlet 1121 is located at the connection of two adjacent side walls, so that the first air outlet 1121 forms a corner outlet, which facilitates the connection between the exhaust pipe 4 and the first air outlet 1121. The connection between the two adjacent side walls has better strength, and if the exhaust pipe 4 touches the connection, the support effect on the exhaust pipe 4 is better.

[0086] It is understandable that the inner seat of the base may also be circular or other common shapes, which will not be described in detail here.

[0087] We know that if the exhaust duct 4 contacts the inner seat 2 of the machine base, the vibration of the exhaust duct 4 will be transmitted to the bottom of the machine body 1 through the inner seat 2 of the machine base, causing vibration noise between the food processor and the work surface; if the exhaust duct 4 contacts the side wall of the machine body 1, the vibration of the exhaust duct 4 will be transmitted to the top of the machine body 1 through the side wall of the machine body 1, causing numbness in the user's hands when operating. Therefore, in one embodiment of the present invention, in order to avoid the exhaust duct 4 from contacting the cavity wall of the accommodating cavity, which causes the vibration of the exhaust duct 4 to be transmitted to the cavity wall of the exhaust duct 4, that is, to the inner seat 2 of the machine base and the side wall of the machine body 1, causing numbness in the user's hands when using it, a clearance fit between the accommodating cavity and the exhaust duct 4 is provided.

[0088] In one implementation scheme of the present invention, a supporting frame is provided inside the exhaust duct 4 to support the exhaust duct 4, thereby preventing the flexible exhaust duct 4 from closing when being bent, ensuring that hot air can be smoothly discharged to the outside of the machine body 1, and improving the heat dissipation effect of the brushless motor 11.

[0089] In one embodiment of the present invention, the exhaust pipe 4 includes a spiral wrapping section, and the spiral wrapping section is provided to extend the length of the exhaust pipe 4 and change the tortuosity of the exhaust air to achieve a noise reduction effect. Moreover, the spiral wrapping section is arranged to extend downwardly and gradually approach the second air outlet 3.

[0090] In one embodiment of the present invention, reference is made to Fig.11 , along the direction from the first air outlet 1121 to the second air outlet 3, the exhaust duct 4 includes a first extension section 491, a first bending section 481, a second extension section 492, a second bending section 482, a third extension section 493, a third bending section 483 and a fourth extension section 494, the first extension section 491 extends outward along the central axis direction of the first air outlet 1121, one end of the second extension section 492 is transversely bent relative to the first extension section 491 to form a first bending section 481 therebetween, one end of the third extension section 493 is vertically bent downward relative to the other end of the second extension section 492 to form a second bending section 482 therebetween, one end of the fourth extension section 494 is transversely bent relative to the other end of the third extension section 493 to form a third bending section 483 therebetween, and the other end of the fourth extension section 494 is connected to the second air outlet 3.

[0091] By setting a first extension section 491 extending outward along the central axis direction of the first air outlet 1121 at the first air outlet 1121, the wind from the first air outlet 1121 does not change and quickly flows to the first extension section 491 along the central axis direction of the first air outlet 1121. In this process, since the flow direction of the wind from the first air outlet 1121 is not changed, the flow rate of the wind can be increased. After the hot air quickly flows into the first extension section 491, one end of the second extension section 492 is set to bend horizontally relative to the first extension section 491 to form a first bending section 481 between the two, so as to realize the conversion of the flow path of the hot air, so that the hot air flexibly collides and weakens in the first bending section 481 to reduce the noise of the wind flow. Then, after the flexible weakening effect of the first bending section 481, in order to accelerate the heat dissipation efficiency, the second extension section 492 is set. Then, one end of the third extension section 493 is bent vertically downward relative to the other end of the second extension section 492 to form a second bending section 482 between the two, so that the second bending section 482 performs a secondary flexible collision and weakening on the wind coming out of the second extension section 492, so as to reduce the noise of the wind flow twice. The third extension section 493 is bent vertically downward, on the one hand to further extend the exhaust path of the exhaust pipe 4, and on the other hand to be close to the second air outlet 3. Then, by bending horizontally at one end of the fourth extension section 494 relative to the other end of the third extension section 493 to form a third bending section 483 between the two, the third bending section 483 performs a third flexible collision and weakening on the wind coming out of the third extension section 493, so as to reduce the noise of the wind flow again. The fourth extension section 494 is connected to the second air outlet 3, and can quickly guide the wind that has been flexibly collided and weakened to the second air outlet 3, which can not only give the user a feeling of light sound, but also quickly guide the wind and improve the heat dissipation efficiency. This solution achieves good noise reduction effect through multiple cycles of "rapid air guide-flexible collision and weakening" without delaying the heat dissipation efficiency.

[0092] In one implementation of the present invention, the exhaust pipe 4 is provided with a diameter reducing section 421, and the noise reduction effect is achieved by the diameter reducing section 421. It should be noted that the diameter reducing section 421 is the diameter reducing section 421 as long as the diameter of the exhaust pipe 4 changes significantly. There are several implementation methods for the diameter reducing section 421:

[0093] Implementation 1: Reference Fig.12 , 13The side wall of the variable diameter section 421 of the exhaust pipe 4 is corrugated, and one end of the variable diameter section 421 is connected to the first extension section 491. By setting the side wall of the variable diameter section 421 to be corrugated, on the one hand, the corrugated variable diameter section 421 is conducive to the extension or contraction of the exhaust pipe 4; on the other hand, when the sound wave passes through the variable diameter section 421, the propagation direction of the sound wave can be continuously changed through the corrugations in different directions, and the energy of the sound wave will be weakened when the sound wave collides with the corrugated surface, so that the direction is continuously changed and the sound wave is weakened, which is conducive to reducing wind noise.

[0094] More specifically, one end of the exhaust pipe 4 is connected to the fourth extension section 494 through the third bending section 483, an anti-drop buckle 4221 is provided on the outer surface of the fourth extension section 494, and a stop rib 31 is provided on the second air outlet 3 (refer to Figure 5 ), the anti-drop buckle 4221 is plugged and matched with the stop rib 31 of the second air outlet 3 to realize a reliable connection between the exhaust pipe 4 and the second air outlet 3. A matching section 422 is provided at the other end of the diameter-reducing section 421, and an anti-drop buckle 4221 is also provided on the outer surface of the matching section 422, and the matching section 422 is connected to the first air outlet 1121. Specifically, when a protrusion 1122 is provided at the first air outlet 1121, the mating section 422 is plugged into and mated with the protrusion 1122 through the anti-drop buckle 4221, that is, the mating section 422 partially penetrates into the inner cavity of the protrusion 1122; when the exhaust duct 4 includes a hard tube 41 and a hose 42 connected to the hard tube 41, the reducing section 421 and the mating section 422 are provided on the hose 42, and the mating section 422 is mated and connected with the hard tube 41 to realize the connection between the hose 42 and the hard tube 41, and then the hard tube 41 is connected to the first air outlet 1121.

[0095] Implementation 2: Reference Fig.10 The variable diameter section 421 of the exhaust pipe 4 includes an air inlet section 43, a buffer section 45, a reduced pipe section 46 and a pressure relief section 47. A transition section 44 is connected between the air inlet section 43 and the buffer section 45. A transition section 44 is provided between the buffer section 45 and the reduced pipe section 46. A transition section 44 is provided between the reduced pipe section 46 and the pressure relief section 47. The diameter of the air inlet section is smaller than the diameter of the buffer section 45, the diameter of the buffer section 45 is larger than the diameter of the reduced pipe section 46, and the diameter of the reduced pipe section 46 is smaller than the diameter of the pressure relief section 47; the length of the air inlet section is smaller than the length of the buffer section 45, the length of the buffer section 45 is larger than the length of the reduced pipe section 46, and the length of the pressure relief section 47 is larger than the length of the reduced pipe section 46.

[0096] Since the exhaust duct 4 needs to be connected to the first air outlet, it needs to avoid the side wall of the inner seat 2 of the machine base to avoid resonance between the exhaust duct 4 and the inner seat 2 of the machine base. Therefore, the diameter of the air inlet section is set to be smaller so that the exhaust duct 4 can be arranged in a smaller space. After the wind coming out of the first air outlet 1121 passes through the transition of the air inlet section, it will be accompanied by a relatively large wind pressure in the air inlet section. Therefore, the buffer section 45 connected to the air inlet section is set to have a large diameter and a long length to release the energy of the wind, reduce the wind pressure and the whistling sound of the wind, and thus achieve noise reduction. The transition section 44 connected between the air inlet section and the buffer section 45 is used to allow the wind to transition to avoid the strong pressure wind coming out of the air inlet section from being released instantly and quickly, generating a strong impact noise. After the buffer section 45, since it is necessary to avoid the reinforcing ribs on the inner seat 2 of the machine base, the diameter of the shrinking tube section 46 is set to be smaller than the buffer section, and the transition section 44 connected between the buffer section and the shrinking tube section 46 also plays a transition role. The reduced pipe section 46 is also conducive to strengthening the wind pressure, so that when passing through the pressure reducing section 47, the wind speed is further reduced and docked with the large-diameter buffer section, thereby releasing the wind energy for a second time, reducing the wind pressure and the whistling sound of the wind, and thus achieving a secondary noise reduction effect.

[0097] In one embodiment of the present invention, the diameter-changing section 421 is disposed between two adjacent bending sections 48. The two bending sections 48 are used to continuously change the flow direction of the wind. The diameter-changing section 421 is disposed between the two bending sections 48, so that when the wind flows through the diameter-changing section 421, the wind pressure is gathered when it encounters a narrower diameter portion, and the wind pressure is released when it encounters a wider diameter portion, thereby reducing the sound of the wind whistling.

[0098] In one embodiment of the present invention, the variable diameter section 421 can be set to be telescopic along the axial direction of the variable diameter section 421, so that we can reasonably stretch or shrink to adapt to the body 1 according to the size of the space of the body 1, and the adaptability is better. It should be noted that the telescopic variable diameter section 421 can be any one of the above-mentioned embodiments 1 and 2.

[0099] In one embodiment of the present invention, based on a food processor with a water tank 15, the food processor also includes 132 connected to the cup body 13, and a liquid receiving cup 16 and a residual water box 17 located on one side of the liquid receiving cup 16 are provided below the 132. There is no specific limitation on whether the liquid receiving cup 16 and the residual water box 17 are two separate parts or an integrated part. The working principle is that the water in the water tank 15 is based on the amount of food added to the cup body 13 and the amount of water required by the corresponding menu, and the crushing knife 131 is driven by a motor to make slurry. After the slurry is made, it is discharged into the liquid receiving cup 16 through 132. After the slurry is discharged, water is added again to clean the cup body 13, and after the cleaning is completed, the cleaning water is discharged into the residual water box 17 through 132.

[0100] Specifically, in this solution, the inner seat 2 of the machine base is located between the liquid receiving cup 16 and the exhaust duct 4, and the top view direction of the food processor includes a long axis direction extending laterally, and the liquid receiving cup 16, the inner seat 2 of the machine base and the exhaust duct 4 are arranged in sequence along the long axis direction. We know that when a user uses a food processor, the food processor is often placed in a direction where the liquid receiving cup 16 faces the user, so as to facilitate taking the liquid receiving cup 16. Therefore, in order to prevent the liquid receiving cup 16 from being too close to the exhaust duct 4 and causing the wind noise in the exhaust duct 4 to be closer to the user, the liquid receiving cup 16 and the exhaust duct 4 are separated by the inner seat 2 of the machine base. At the same time, in order to further lengthen the distance between the exhaust duct 4 and the liquid receiving cup 16, the food processor is arranged to include a long axis direction extending laterally when viewed from the top view (i.e., refer to Fig. 9 The X-axis in the figure), and the short axis direction perpendicular to the long axis direction (reference Fig. 9 The liquid receiving cup 16, the inner base 2 of the machine base and the exhaust pipe 4 are sequentially arranged along the long axis direction.

[0101] Furthermore, the food processor also includes a water tank 15 and a water tank mounting frame 14 for mounting the water tank 15, and the accommodating cavity is located between the base inner seat 2 and the water tank mounting frame 14. By providing the water tank 15, water can be automatically added when making food ingredients, the food processor is more intelligent, and the success rate of user production is higher. On this basis, the water tank mounting frame 14 is provided to be used to mount the water tank 15 outwardly, and the water tank mounting frame 14 is used to enclose the base inner seat 2 inwardly to form an accommodating cavity, so that the water tank mounting frame 14 is dual-purpose and saves costs.

[0102] In one embodiment of the present invention, reference is made to Figure 8 The second air outlet 3 is arranged below the water tank mounting frame 14, and the exhaust pipe 4 includes an extension section 49 located below the water tank mounting frame 14. The diameter of the extension section 49 is smaller than the plumb height L4 between the bottom surface of the water tank mounting frame 14 and the inner bottom surface of the body 1 to avoid interference between the exhaust pipe 4 and the water tank mounting frame 14.

[0103] In one embodiment of the present invention, if the brushless motor 11 is lowered and arranged under the premise of providing the liquid receiving cup 16, the position of the slurry discharge pipe will also be adaptively lowered, resulting in the liquid receiving cup 16 and the residual water box 17 needing to be made very low, which will lengthen the lateral dimensions of the liquid receiving cup 16 and the residual water box 17, thereby affecting the lateral dimensions of the entire machine (i.e., reference Fig. 9 Therefore, the present invention is to provide a solution to further solve the working noise generated by the brushless motor 11 without increasing the occupied space of the whole machine.

[0104] Specifically, refer to Fig. 9, the plumb height L1 of the center axis of the first air outlet 1121 from the center axis of the second air outlet 3 is between 10 cm and 18 cm. By setting L1 between 10 cm and 18 cm, the exhaust pipe 4 can have a longer length to extend the exhaust path length. When the plumb height (i.e., L1) of the center axis of the first air outlet 1121 from the center axis of the second air outlet 3 is greater than 18 cm, the center of gravity of the brushless motor 11 will be too high, which will reduce the working stability of the whole machine. When the plumb height (i.e., L1) of the center axis of the first air outlet 1121 from the center axis of the second air outlet 3 is less than 10 cm, the total length of the exhaust pipe 4 will be limited, thereby affecting the reduction of wind noise, and the liquid receiving cup 16 and the residual water box 17 will be shortened and the lateral distance will be lengthened, thereby affecting the lateral size of the whole machine (i.e., reference size). Fig. 9 X-axis dimension).

[0105] In one embodiment of the present invention, reference is made to Fig. 9 , by setting the lateral distance L3 between the first air outlet 1121 and the second air outlet 3 along the axial direction of the first air outlet 1121 to be between 35-45mm, the exhaust pipe 4 is provided with a lateral extension space, which helps to extend the total length of the exhaust pipe 4, thereby lengthening the propagation path of the wind noise, weakening the energy of the wind, and achieving the effect of noise reduction. Moreover, the large lateral space can reduce the probability of the exhaust pipe 4 touching the inner seat 2 of the base and the side wall of the body 1. When L3 is greater than 45mm, although the probability of the exhaust pipe 4 touching the inner seat 2 of the base and the side wall of the body 1 can be reduced, due to the excessive lateral space, the length of the entire food processor along the X-axis direction will be very long, affecting the user's handling and use; when L3 is less than 45mm, the lateral space is small, and the exhaust pipe 4 is easy to touch and be flattened by the inner seat 2 of the base and the side wall of the body 1, affecting the exhaust effect.

[0106] The technical solution protected by the present invention is not limited to the above-mentioned embodiments. It should be pointed out that the combination of the technical solution of any one embodiment with the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A food processor with low noise, comprising a casing and a cup body arranged on the casing, wherein a brushless motor is arranged in the casing, the brushless motor is arranged at the lower part of the cup body, a crushing device driven by the brushless motor is arranged in the cup body, the brushless motor comprises a motor body, a motor shaft arranged on the motor body, an upper end cover and a lower end cover, the crushing device is arranged at the upper end of the motor shaft, a mounting cavity for accommodating the motor body is formed between the upper end cover and the lower end cover, a first horizontal air outlet and an air inlet arranged staggered with the first air outlet are arranged on the side wall of the upper end cover or the lower end cover, characterized in that: A horizontally placed second air outlet is provided on the bottom side wall of the casing, a height difference between a central axis of the first air outlet and a central axis of the second air outlet is L1, a distance between an upper end surface of the upper end cover and a lower end surface of the lower end cover is L2, wherein L1 ≥ 1.2L2, a flexible exhaust duct is connected between the first air outlet and the second air outlet, and the exhaust duct is bent at least twice to form at least two bent sections.

2. The low-noise food processor according to claim 1, characterized in that: The central axis of the first air outlet and the central axis of the second air outlet are arranged to intersect each other in the vertical direction, so that the exhaust pipe is bent in at least two different directions.

3. The low-noise food processor according to claim 1, characterized in that: An inner base is provided below the lower end cover, one end of the inner base is connected to the bottom surface of the casing, and the other end is fixedly connected to the upper end cover or the lower end cover, and a receiving cavity for accommodating the exhaust pipe is formed between the outer wall of the inner base and the inner wall of the casing.

4. The low-noise food processor according to claim 3, characterized in that: The inner seat of the machine base extends upward to surround the first air outlet, and a side wall of the inner seat of the machine base is provided with an air duct outlet for the exhaust pipe to pass through.

5. The low-noise food processor according to claim 4, characterized in that: The air duct outlet supports the exhaust pipe; Alternatively, the inner seat of the machine base is polygonal, and the inner seat of the machine base includes a plurality of connected side walls, and the first air outlet is located at the connection between two adjacent side walls.

6. The low-noise food processor according to claim 3, characterized in that: The food processor further comprises a pulp discharge pipe connected to the cup body, a liquid receiving cup is arranged below the pulp discharge pipe, the inner seat of the machine base is located between the liquid receiving cup and the exhaust pipe, the top view direction of the food processor comprises a long axis direction extending laterally, and the liquid receiving cup, the inner seat of the machine base and the exhaust pipe are arranged in sequence along the long axis direction; Alternatively, the accommodating cavity and the exhaust pipe are clearance-matched; Alternatively, the food processing machine further comprises a water tank and a water tank mounting frame for mounting the water tank, and the accommodating cavity is located between the inner seat of the machine base and the water tank mounting frame.

7. The low-noise food processor according to claim 1, characterized in that: The first air outlet is located on the lower end cover, and the lower end cover is further provided with a protrusion protruding from the side wall of the lower end cover at the first air outlet, the interior of the protrusion is hollow to extend the air outlet path of the first air outlet, and one end of the exhaust pipe is sleeved and matched with the protrusion; Alternatively, the central axis of the first air outlet is at a height of 10 cm to 18 cm from the central axis of the second air outlet; Alternatively, the lateral distance between the first air outlet and the second air outlet along the axial direction of the first air outlet is between 35-45 mm; Alternatively, a support frame for supporting the exhaust duct is provided inside the exhaust duct; Alternatively, the exhaust duct includes a spirally wrapped section, and the spirally wrapped section is arranged to extend obliquely downward.

8. The low-noise food processor according to claim 1, characterized in that: Along the direction from the first air outlet to the second air outlet, the exhaust duct includes a first extension section, a first bending section, a second extension section, a second bending section, a third extension section, a third bending section and a fourth extension section, the first extension section extends outward along the central axis direction of the first air outlet, one end of the second extension section is bent laterally relative to the first extension section to form a first bending section therebetween, one end of the third extension section is bent vertically downward relative to the other end of the second extension section to form a second bending section therebetween, one end of the fourth extension section is bent laterally relative to the other end of the third extension section to form a third bending section therebetween, and the other end of the fourth extension section is connected to the second air outlet.

9. The low-noise food processor according to claim 1, characterized in that: The exhaust pipe is provided with a diameter-changing section, and the diameter-changing section is arranged between two adjacent bending sections.

10. The low-noise food processor according to claim 9, characterized in that: The side wall of the variable diameter section is corrugated; Alternatively, the diameter-changing section may be telescopically arranged along the axial direction of the diameter-changing section.

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