Low-noise food processor

Abstract

The invention provides a low-noise food processor which comprises a cup body, at least the lower end of the cup body is made of metal, a permanent magnet brushless motor upper end cover is integrally formed on the cup body, the low-noise food processor further comprises a permanent magnet brushless motor lower end cover which is separated from the cup body, the upper end cover and the lower end cover are locked and fixed, and the cup body is provided with a heating piece. An installation cavity is formed between the upper end cover and the lower end cover, a permanent magnet rotor assembly and a stator winding assembly are arranged in the installation cavity, a smashing cutter directly driven by a permanent magnet rotor to rotate is arranged in the cup body, and a first installation part used for installing a bearing on the permanent magnet rotor is arranged at the bottom of the cup body. The lower end cover is provided with a second installation part used for installing a lower bearing of the permanent magnet rotor, and the permanent magnet rotor shaft penetrates through the first installation part and the second installation part, so that the permanent magnet brushless motor and the cup body form a non-detachable whole. Therefore, the operation core of the food processor, namely the crushing power system assembly formed by the permanent magnet brushless motor and the cup body, is more stable and reliable.

Description

Technical Field

[0001] The invention belongs to the field of food processing machines, and in particular relates to a variable frequency food processing machine with low noise, low cost and stable operation. Background Art

[0002] The existing food processing machine includes a machine base, a cup body assembly arranged on the machine base, and the cup body assembly includes a cup body, a crushing knife and a heating plate. After power-on, the control module drives the crushing knife by controlling the motor, and the heating device crushes and heats the material. The motor includes a main body and a motor bracket, and the motor is hoisted on the heating plate through the motor bracket. Especially for food processing machines with automatic processing, pulp discharge and automatic water inlet and cleaning, a series-excited motor is generally used, and a certain axial spacing is set between the motor and the heating plate to prevent the motor from being affected by the heat radiation of the heating plate and affecting the motor's temperature rise performance. This also makes the motor output shaft longer, the crushing knife is farther away from the motor body, and the disturbance and abnormal noise are larger during the high-speed operation of the motor-driven crushing knife, which affects the processing performance of the food processing machine and the taste of the food.

[0003] Patent application number CN201921599967.0 discloses a cooking cup with an improved motor mounting structure, comprising a cup body, a cup cover, a cup stand, an electric heating plate, a motor and a knife set, wherein the upper end of the cup stand is fixedly connected to the lower end of the cup body, the electric heating plate is arranged in the lower opening of the cup body to seal the lower opening of the cup body, the motor is arranged in the cavity of the cup stand and is located below the electric heating plate, the rotating shaft of the motor passes through the axial hole on the electric heating plate and extends into the cup body to be connected to the knife set, the electric heating plate comprises a plate body and an electric heating tube attached to the lower surface of the plate body, and the lower surface of the plate body is provided with a downwardly extending The bracket seat, the screws pass through the through holes on the motor from bottom to top and screw into the bracket seat, the motor is hung and fixedly connected to the electric heating plate, forming an integrated structure of the motor and the electric heating plate. This solution locks the series motor body on the heating plate by screws, saving the motor installation space in the axial direction. After the motor and the heating plate form a whole, the motor body can still be removed as an independent component and operate independently, that is to say, the series motor body is not truly integrated with the heating plate, it can still be removed from the heating plate as an independent motor and drive the motor shaft to rotate when the power is turned on. In addition, since the temperature rise problem of the series motor is more significant, the series motor is close to the heating plate and is subject to high radiant heat temperature. Even if additional thermal insulation is set, the temperature rise problem of the series motor cannot be avoided. In addition, the motor body hoisting setting still has the problem of lateral displacement or shaking of the motor body, which causes disturbance of the entire crushing power system, and cannot solve the problems of noise and transmission stability from the source of the power system and transmission system. On the other hand, the series motor is provided with carbon brushes, the commutation noise of the carbon brushes is large, and the carbon powder easily floats into the air, which is not good for the health of users.

[0004] The patent with application number CN202121316154.3 discloses a food processing machine with fully automatic pulping, pulping, cleaning and waste discharge functions, including a main machine and a processing cup assembly fixed to the main machine, the processing cup assembly including a cup body and a heating plate, a processing knife group is provided inside the cup body, and the heating plate is arranged at the bottom of the cup body. A motor assembly is provided inside the main machine, and the motor assembly includes a motor body and an output shaft. The output shaft extends upward to the cup body assembly and is fixedly connected to the processing knife group. The heating plate is provided with a mounting portion, and the motor body is fixed to the main machine through the heating plate mounting portion. A mounting groove for limiting the output shaft is also provided at the bottom of the heating plate, so that the motor assembly has low noise during operation, is easy to install and fix, and is stable and reliable. This scheme achieves the purpose of noise reduction by hanging the series-excited motor body on the heating plate to reduce the axial distance between the motor and the heating plate, but the series-excited motor itself has large noise and the temperature rise performance is also easily affected by the heating plate.

[0005] The permanent magnet brushless motor in the prior art includes an upper end cover and a lower end cover, and the upper end cover and the lower end cover are respectively positioned and matched with the stator core, so as to form a permanent magnet brushless motor installation cavity between the upper end cover and the lower end cover, which allows the stator core to be exposed or not exposed. The patent with application number CN202110173563.0 discloses a flattened food processor, including a machine base and a mixing cup installed on the machine base, wherein a motor and an air duct flowing through the motor are arranged in the machine base, and the air duct includes a heat dissipation cavity formed inside the motor, and the motor includes a motor shaft, a rotor wrapping the motor shaft, a stator wrapping the rotor, and a bracket forming an axial end face of the motor, and the bracket is located above the stator and / or below the stator, and the stator includes a stator core and at least three stator windings distributed around the rotor, and the bracket and the stator core are connected to each other. At least part of the heat dissipation cavity is formed between the cores, and the heat dissipation cavity between the bracket and the stator core extends radially and guides the air to flow through the stator winding radially. This scheme applies the permanent magnet brushless motor to the food processing machine. The permanent magnet brushless motor includes an upper and lower bracket, and is arranged in the main machine through the upper and lower brackets. The main machine is connected to the cup body through a coupling to realize power transmission. When there is a gap between the coupling and the rotor shaft, the dynamic balance is greatly affected. The transmission shaft distance is long and the dimensional chain in the transmission system is long, the transmission is unstable, and transmission noise is easy to generate. In addition, this setting is equivalent to the permanent magnet brushless motor composed of the bracket, the motor stator and the motor rotor as an independent whole, and the entire independent motor can be removed relative to the main machine for independent operation.

[0006] Therefore, under the operating conditions of ensuring the processing performance, high speed and high heating power of the food processing machine, how to reduce the operating noise of the whole machine, improve the sound quality of the food processing machine, avoid serious wear of the shaft seal, reduce manufacturing costs and optimize the stability of the crushing power system are issues that need to be solved urgently. Summary of the invention

[0007] The object of the present invention is to provide a variable frequency controlled food processor with optimized sound quality, a stable and reliable crushing power system and a fine and consistent taste of processed food.

[0008] In order to solve the above technical problems, the present invention provides a low-noise food processor, including a cup body, wherein at least the lower end of the cup body is made of metal and is integrally formed with an upper end cover of a permanent magnet brushless motor, and also includes a lower end cover of a permanent magnet brushless motor separately arranged from the cup body, the upper end cover and the lower end cover are locked and fixed, the cup body is provided with a heating element, an installation cavity is formed between the upper end cover and the lower end cover, a permanent magnet rotor assembly and a stator winding assembly are arranged in the installation cavity, a crushing knife directly driven to rotate by the permanent magnet rotor is arranged in the cup body, a first installation portion for installing an upper bearing of the permanent magnet rotor is provided at the bottom of the cup body, the lower end cover is provided with a second installation portion for installing a lower bearing of the permanent magnet rotor, and the permanent magnet rotor shaft is respectively arranged through the first installation portion and the second installation portion.

[0009] Furthermore, the cup body comprises a bottom, the inner side of the bottom forms an inner wall of the cup body for holding food, and the outer side of the bottom forms an upper end plate of the upper end cover.

[0010] Furthermore, the distance between the upper bearing and the lower bearing, and the distance between the upper bearing and the center of the crushing knife are not greater than the outer diameter of the stator winding assembly.

[0011] Furthermore, the upper end cover includes an upper end plate formed by the outer side of the bottom of the cup body, and an upper side wall integrally formed around the upper end plate, and the lower end cover includes a lower end plate and a lower side wall, and the permanent magnet rotor assembly and the stator winding assembly are at least partially located within the upper side wall and the lower side wall.

[0012] Furthermore, an installation gap is provided between the opening of the upper end cover and the opening of the lower end cover, the stator winding assembly includes a stator core and a stator coil, the stator core is at least partially exposed in the installation gap, a positioning protrusion is provided in the upper side wall, and the positioning protrusion abuts against the stator core.

[0013] Furthermore, a third mounting portion for mounting a shaft seal is provided above the first mounting portion, the third mounting portion is connected to the first mounting portion and a step is formed at the connection, and the thickness of the bottom of the cup body is not greater than the overall height of the first mounting portion and the third mounting portion.

[0014] Furthermore, the first mounting portion and the second mounting portion are respectively provided with limiting structures that cooperate with the upper bearing and the lower bearing of the permanent magnet brushless motor.

[0015] Furthermore, the cup body is provided with a first locking portion, the lower end cover is provided with a second locking portion, and the screw passes through the second locking portion and the first locking portion in sequence to lock and connect the upper end cover and the lower end cover.

[0016] Further, the cup body includes a cup body and a heating plate, the heating element is embedded in the heating plate, the first mounting portion is arranged at the center of the heating plate, the upper end cover is integrally formed and arranged on the heating plate, the cup body and the heating plate are integrally cast to form a cast aluminum cup body, the heating element is a heating tube embedded in the bottom of the cup body, and the upper end cover is integrally formed and arranged on the bottom of the cast aluminum cup body; or, the cup body includes a cup body and a heating plate, the heating element is embedded in the heating plate, the first mounting portion is arranged at the center of the heating plate, the upper end cover is integrally formed and arranged on the heating plate, the cup body is a glass body, the heating plate is a cast aluminum heating plate, and the lower port of the cup body is sealed and connected to the heating plate.

[0017] Furthermore, a liquid discharge port and a liquid discharge valve are provided on the cup body, and an air inlet communicating with the mounting cavity is provided on a side of the lower part of the cup body away from the liquid discharge valve.

[0018] The beneficial effects of the present invention are:

[0019] 1. The upper end cover of the permanent magnet brushless motor is integrally formed and arranged at the lower part of the cup body. A mounting cavity is formed between the upper end cover and the lower end cover, and the upper end cover and the lower end cover are fixedly connected to accommodate the rotor assembly and the stator assembly of the permanent magnet brushless motor in the mounting cavity. The bottom of the cup body is provided with a first mounting portion for mounting a first bearing, and the lower end cover is provided with a second mounting portion for mounting a second bearing. The rotor shaft passes through the first mounting portion and the second mounting portion respectively, which is equivalent to the permanent magnet brushless motor and the cup body forming a crushing power system assembly. The permanent magnet rotor assembly and the stator winding of the permanent magnet brushless motor The assembly, the lower end cover and the cup body form the smallest unit of the permanent magnet brushless motor for independent operation, that is, when the lower end cover of the permanent magnet brushless motor and the permanent magnet rotor and stator winding assembly are separated from the cup body, they cannot operate independently at all, so that the permanent magnet brushless motor and the cup body form an inseparable whole, making the operation core of the food processor, that is, the crushing power system assembly formed by the permanent magnet brushless motor and the cup body, more stable and reliable, small space occupation, compact structure and stable operation, improved crushing efficiency and heating efficiency, improved overall dynamic balance performance, and lower vibration noise. The transmission structure between the power part and the crushing part of the crushing power system is supported by two supporting positioning points, the first bearing and the second bearing, and the transmission system is stable and reliable. Compared with the prior art, the motor itself is provided with two upper and lower bearings and then superimposed with the bearing between the crushing blade shaft and the cup body through hole, a total of three bearings, so that the transmission system has unstable force at multiple support positions, there are problems of over-positioning and high cost, the transmission noise near the bearing is large, and the vibration frequency between multiple support points is easily superimposed, thereby exacerbating the resonance noise. The first mounting part is equivalent to integrating and reusing the bearing at the upper end of the permanent magnet brushless motor and the bearing of the transmission shaft at the through hole of the cup body, thereby reducing accessories and simplifying the installation of the whole machine. The crushing power system can be transported as a standardized large component and assembled in the finished product factory, which greatly saves assembly and transportation costs and avoids intermediate turnover.

[0020] 2. The inner side of the bottom of the cup body forms the inner wall of the cup body for holding food, and the outer side of the bottom forms the upper end plate of the upper end cover, that is, the cup body and the upper end cover reuse the bottom of the cup body, and the cup body and the upper end cover of the motor are integrated into one component, which reduces the length of the motor output shaft in height, and the crushing knife runs stably. The crushing power system composed of the crushing knife, the cup body, and the motor has low resonance noise, which improves the sound quality. The distance between the upper bearing and the lower bearing, and the distance between the upper bearing and the center of the crushing knife are not greater than the outer diameter of the stator winding assembly. The entire crushing power system assembly is more integrated as a whole. The center of the whole formed by the permanent magnet brushless motor and the cup body is as close to the crushing knife as possible, and the height is minimized to reduce the resonance point. The smallest unit formed by the permanent magnet brushless motor and the cup body cannot be disassembled, has good stability, small radial disturbance during crushing, and good coaxiality consistency between the crushing knife and the rotor shaft.

[0021] 3. The permanent magnet rotor assembly and the stator winding assembly are at least partially located within the upper side wall of the upper end cover and the lower side wall of the lower end cover, so that the cup body and the lower end cover form an indispensable part of the permanent magnet brushless motor. When the permanent magnet rotor assembly and the stator winding assembly are removed from the cup body, they cannot operate independently. Without the support of the upper end plate and the lower end plate and the limitation of the upper side wall and the lower side wall, the permanent magnet rotor assembly and the stator winding assembly cannot cooperate and drive the rotor shaft to rotate. Therefore, the cup body is a necessary component of the permanent magnet brushless motor, rather than independent of the permanent magnet brushless motor, so that the cup body, the permanent magnet rotor assembly, the stator winding assembly and the lower end cover form the smallest non-detachable unit that can operate independently.

[0022] 4. An installation gap is provided between the upper end cover and the lower end cover to avoid contact and over-positioning between the upper side wall and the lower side wall, and also to provide sufficient space and reliable positioning for the limit of the permanent magnet rotor assembly and the stator winding assembly. The first installation part and the third installation part are connected, and are used to install the upper bearing and the shaft seal respectively. On the one hand, they support the stable transmission of the transmission system, and on the other hand, they prevent the liquid in the cup from leaking and extending downward along the rotor shaft to the permanent magnet rotor assembly and the stator winding assembly. In addition, the length of the rotor shaft is shortened, which can effectively reduce the problem of uneven assembly gap between the rotor shaft and the shaft seal, avoid disturbance, and thus extend the life of the shaft seal, fully ensuring the sealing and waterproof effect of the shaft seal.

[0023] 5. The cup body includes a cup body and a heating plate, the heating element is embedded in the heating plate, and the first bearing is installed in the first installation part in the center of the heating plate, and the upper end cover is integrally formed and arranged on the heating plate, which is equivalent to forming an installation cavity for installing the permanent magnet brushless motor between the heating plate and the lower end cover. The upper end cover of the permanent magnet brushless motor is reused with the heating plate, which saves the assembly space and the number of accessories of the crushing power system, reduces the cost, and the heating plate and the motor are hard-connected as a whole. When the cup body is displaced relative to the original installation position, the permanent magnet brushless motor is displaced with the cup body. Similarly, the motor output shaft and the crushing knife are also displaced accordingly. For example, the cup body is in the diameter If it is tilted upward at a certain angle, the entire crushing power system will be tilted radially at a certain angle, and the relative displacement of the crushing knife, output shaft, motor and cup body will be zero, that is, the relative assembly position and assembly accuracy will remain unchanged. Therefore, even if the crushing power system as a whole is displaced, the assembly relationship between the cup body, heating plate, crushing knife, permanent magnet brushless motor and output shaft will remain unchanged, which will not affect the processing performance of the food processor. In addition, the actual noise of the entire crushing power system as a noise source is reduced to the greatest extent, the sound quality is optimized, there is no sharp and harsh audio, and no new resonance points or abnormal sounds will be generated.

[0024] 6. The cup body and the heating plate are integrally cast to form a cast aluminum cup body. The cup body structure is further simplified. The upper end cover is integrally formed with the entire cast aluminum cup body. The large components of the crushing power system can be assembled and exported from the motor factory, which greatly reduces the production process and assembly costs. The relative position of the crushing knife and the internal space of the cup body is unique and the crushing knife shaft has little disturbance. Of course, the cup body can also be set up so that the glass cup body and the cast aluminum heating plate are installed as one. At this time, the upper end cover is directly integrated on the heating plate, which simplifies the installation process of the motor assembly and visualizes the processing, optimizing the user experience.

[0025] 7. The cup body is provided with a drain port and a drain valve for controlling the opening and closing of the drain port. The air inlet at the lower part of the cup body is arranged on the side away from the drain valve to avoid resonance between the rapid airflow at the air inlet and the drain valve. The drain valve and the air inlet are arranged on both sides of the cup body, away from the air inlet, which is equivalent to reducing the running noise of the rotary valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The figure is a schematic diagram of the overall structure of the food processing machine of the present invention.

[0028] Figure 2This is a schematic diagram of the structure of the heating plate and permanent magnet brushless motor of the food processing machine of the present invention.

[0029] Figure 3 Another schematic diagram of the heating plate and permanent magnet brushless motor of the food processing machine of the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the heating plate of the food processing machine of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the lower end cover of the food processing machine of the present invention.

[0032] Figure 6 It is a schematic diagram of the local structure of the food processing machine of the present invention.

[0033] Figure 7 This is another schematic diagram of the overall structure of the food processing machine of the present invention.

[0034] The names of the components in the figure are as follows: 100, main unit; 101, inner base of the base; 102, mounting portion; 103, pulp receiving cup; 104, waste receiving cup; 105, water tank; 106, main unit air outlet;

[0035] 200, cup body; 201; upper end cover; 2011, upper end plate; 2012, upper side wall; 2023, positioning protrusion; 202, heating element; 203, heating plate; 204, cup body; 205, crushing knife; 206, first mounting part; 207, third mounting part; 208, limiting structure; 209, first locking part; 210, drain valve; 211, air inlet; 212, step; 213, drain outlet;

[0036] 300, permanent magnet rotor assembly; 301, permanent magnet rotor shaft; 302, permanent magnet rotor upper bearing; 303, permanent magnet rotor lower bearing; 304, gasket;

[0037] 400, stator winding assembly; 401, stator core; 402, stator coil;

[0038] 500, lower end cover; 501, lower end plate; 502, lower side wall; 503, second locking portion; 504, air outlet; 505, second mounting portion;

[0039] 600, power module; 601, driving board body; 602, heat sink;

[0040] 700, installation cavity; 701, installation gap; 702, screw;

[0041] 800. air guide channel; 801. flexible air duct. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] like Figures 1 to 7 As shown, the present invention provides a low-noise food processing machine, including a cup body 200, wherein at least the lower end of the cup body 200 is made of metal, and an upper end cover 201 of a permanent magnet brushless motor is integrally formed thereon, and further comprising a lower end cover 500 of a permanent magnet brushless motor which is separately arranged from the cup body 200, wherein the upper end cover 201 and the lower end cover 500 are locked and fixed, the cup body 200 is provided with a heating element, and an installation cavity 700 is formed between the upper end cover 201 and the lower end cover 500, wherein a permanent magnet rotor assembly 300 and a stator winding assembly 400 are arranged in the installation cavity 700, a crushing knife 205 which is directly driven to rotate by the permanent magnet rotor is arranged in the cup body 200, a first installation portion 206 for installing an upper bearing 302 of the permanent magnet rotor is arranged at the bottom of the cup body 200, and the lower end cover 500 is provided with a second installation portion 206 for installing a lower bearing 303 of the permanent magnet rotor The permanent magnet rotor shaft 301 is respectively arranged through the first mounting part 206 and the second mounting part 505, which is equivalent to the permanent magnet brushless motor and the cup body 200 forming a crushing power system assembly, and the permanent magnet brushless motor and the cup body 200 form the smallest unit of the permanent magnet brushless motor to operate independently, that is, when the lower end cover 500 of the permanent magnet brushless motor and the permanent magnet rotor and stator winding assembly 400 are separated from the cup body 200, they cannot operate independently at all, so that the permanent magnet brushless motor and the cup body 200 form an inseparable whole, so that the running core of the food processor, that is, the crushing power system assembly formed by the permanent magnet brushless motor and the cup body 200, is more stable and reliable, occupies a small space, has a compact structure and runs smoothly, improves the crushing efficiency and heating efficiency, improves the dynamic balance performance of the whole body, and reduces the vibration and noise. The transmission structure between the power part and the crushing part of the crushing power system is supported by two support positioning points of the first bearing and the second bearing, and the transmission system is stable and reliable. Compared with the prior art, the motor itself is provided with two upper and lower bearings and then the bearing between the crushing blade shaft and the cup body through hole is superimposed, a total of three bearings, which makes the force of multiple support positions of the transmission system unstable, and there are problems of over-positioning and high cost. The transmission noise near the bearing is large, and the vibration frequency between multiple support points is easily superimposed, thereby aggravating the resonance noise. The first mounting part 206 is equivalent to integrating and reusing the bearing at the upper end of the permanent magnet brushless motor and the bearing of the transmission shaft at the cup body through hole, thereby reducing accessories and simplifying the installation of the whole machine. The crushing power system can be transported as a standardized large component and assembled in the finished product factory, which greatly saves assembly and transportation costs and avoids intermediate turnover.

[0044] like Figure 1As shown, the food processor includes a water tank 105 arranged on the main machine 100 and a drain valve 210 arranged on the cup body 200. The water tank 105 is connected to the processing chamber in the cup body 200 through a water pipeline. The water tank 105 is arranged on the rear side of the cup body 200, and the drain valve 210 is arranged on the front side of the cup body 200. A liquid receiving cup is provided below the drain valve 210. Preferably, the liquid receiving cup includes a slurry receiving cup 103 and a waste receiving cup 104.

[0045] like Figure 2 and Figure 3 As shown, the cup body 200 includes a bottom, the inner side of the bottom forms an inner wall of the cup body 200 for holding food, and the outer side of the bottom forms an upper end plate 2011 of the upper end cover 201 . The cup body 200 includes a cup body 204 and a heating plate 203, wherein the heating element is embedded in the heating plate 203. Preferably, the cup body 204 is a glass body, and the heating plate 203 is a cast aluminum heating plate 203. The lower port of the cup body 204 is sealed and connected to the heating plate 203, and the first bearing is installed in the first installation part 206 at the center of the heating plate 203. The upper end cover 201 is integrally formed and arranged on the heating plate 203, which is equivalent to forming an installation cavity 700 for installing the permanent magnet rotor assembly 300 and the stator winding assembly 400 between the heating plate 203 and the lower end cover 500. The upper end cover 201 of the permanent magnet brushless motor is reused with the heating plate 203, which saves the assembly space and the number of accessories of the crushing power system and reduces the cost. The heating plate 203 and the motor are hard-connected as a whole. When the cup body 200 is relative to the original installation position, the upper end cover 201 of the permanent magnet brushless motor is reused with the heating plate 203. When the cup body 200 is displaced, the permanent magnet brushless motor will be displaced along with the cup body 200. Similarly, the motor output shaft and the crushing blade 205 will also be displaced accordingly. For example, if the cup body 200 is tilted at a certain angle in the radial direction, the corresponding entire crushing power system will be tilted at a certain angle in the radial direction, and the relative displacement of the crushing blade 205, the output shaft, the motor and the cup body 200 will be zero, that is, the relative assembly position and the assembly accuracy will remain unchanged. Therefore, even if the crushing power system as a whole is displaced, the assembly relationship between the cup body 204, the heating plate 203, the crushing blade 205, the permanent magnet brushless motor and the output shaft will remain unchanged, so as not to affect the processing performance of the food processor, and the actual noise of the entire crushing power system as a noise source will be reduced to the maximum extent, the sound quality will be optimized, there will be no sharp and harsh audio, and no new resonance points or abnormal sounds will be generated.

[0046] The permanent magnet brushless motor formed integrally with the cup body 200 can maximize the space in height, improve the running stability of the permanent magnet brushless motor, reduce disturbance and noise, and reduce the transmission size chain. The distance between the upper bearing and the lower bearing, and the distance between the upper bearing and the center of the crushing knife 205 are not greater than the outer diameter of the stator winding assembly 400. The entire crushing power assembly is more integrated as a whole. The center of the whole formed by the permanent magnet brushless motor and the cup body 200 is as close to the crushing knife 205 as possible, and the height is as low as possible to reduce the resonance point. The minimum unit formed by the permanent magnet brushless motor and the cup body 200 is non-detachable, has good stability, small radial disturbance during crushing, and good coaxiality consistency between the crushing knife 205 and the rotor shaft.

[0047] The upper end cover 201 includes an upper end plate 2011 formed by the outer side of the bottom of the cup body 200, and an upper side wall 2012 integrally formed around the upper end plate 2011. The lower end cover 500 includes a lower end plate 501 and a lower side wall 502. The permanent magnet rotor assembly 300 and the stator winding assembly 400 are at least partially located in the upper side wall 2012 and the lower side wall 502, so that the cup body 200 and the lower end cover 500 form an indispensable part of the permanent magnet brushless motor. After being disassembled from the cup body 200, 400 cannot operate independently. Without the support of the upper end plate 2011 and the lower end plate 501 and the limitation of the upper side wall 2012 and the lower side wall 502, the permanent magnet rotor assembly 300 and the stator winding assembly 400 cannot cooperate and drive the rotor shaft to rotate. Therefore, the cup body 200 is a component of the permanent magnet brushless motor, rather than independent of the permanent magnet brushless motor, so that the cup body 200, the permanent magnet rotor assembly 300, the stator winding assembly 400 and the lower end cover 500 form a minimum non-detachable unit that can operate independently.

[0048] An installation gap 701 is provided between the opening of the upper end cover 201 and the opening of the lower end cover 500. The stator winding assembly 400 includes a stator core 401 and a stator coil 402. The stator core 401 is at least partially exposed in the installation gap 701. Figure 2 and Figure 4As shown, a positioning protrusion 2023 is provided in the upper side wall 2012, and the positioning protrusion 2023 abuts against the stator core 401 to limit the axial position of the stator winding assembly 400. The upper side wall 2012 and the lower side wall 502 limit the stator winding assembly 400 radially to avoid contact and over-positioning between the upper side wall 2012 and the lower side wall 502, and also provide sufficient space for the limitation of the permanent magnet rotor assembly 300 and the stator winding assembly 400 and reliable positioning. The first mounting portion 206 and the third mounting portion 207 are connected, and are respectively used to install the upper bearing and the shaft seal, on the one hand to support the stable transmission of the transmission system, and on the other hand to prevent the liquid in the cup body 200 from leaking and extending downward along the rotor shaft to the motor, thereby shortening the length of the rotor shaft, effectively reducing the problem of uneven assembly gap between the rotor shaft and the shaft seal, avoiding disturbance, and thus extending the life of the shaft seal, and fully ensuring the sealing and waterproof effects of the shaft seal.

[0049] A third mounting portion 207 for mounting a shaft seal is also provided above the first mounting portion 206. The first mounting portion 206 and the second mounting portion 505 are respectively provided with a limiting structure 208 that cooperates with the upper bearing and the lower bearing of the permanent magnet brushless motor. The third mounting portion 207 is connected to the first mounting portion 206 and a step 212 is formed at the connection. The limiting structure 208 includes the step 212. The limiting structure 208 also includes the limiting end face of the second mounting portion 505. The limiting structure 208 limits the axial and radial positions of the permanent magnet rotor assembly 300, as well as the shaft seal. The thickness of the bottom of the cup body 200 is not greater than the overall height of the first mounting portion 206 and the third mounting portion 207. Specifically, the limiting structure 208 includes the end face of the upper mounting step 212 of the first mounting portion 206 and the lower mounting end face of the second mounting portion 505. The upper end of the upper bearing abuts against the upper mounting end face, and the lower end of the lower bearing abuts against the lower mounting end face. A through hole is provided in the middle of the lower mounting end surface for the lower end of the rotor shaft to pass through, so that when the crushing knife 205 is riveted, the fixture can clamp and position the rotor shaft through the lower end of the rotor shaft. Preferably, the permanent magnet rotor shaft 301 is provided with a flat position, the crushing knife 205 is riveted and fixed to the upper end of the rotor shaft, and the lower end of the permanent magnet rotor shaft 301 extends out of the bottom of the end plate of the lower end cover 500 by no less than 10 mm. Preferably, the upper end cover 201 and the lower end cover 500 are also provided with iron core support ribs to further strengthen the strength of the upper end plate 2011 and the lower end plate 501. The support ribs can be arranged on the inner side of the upper end plate 2011 or the lower end plate 501, or on the inner side of the upper side wall 2012 or the lower side wall 502, or at the connection between the end plate and the side wall. The support ribs can be independent protrusions or depressions, or continuous or discontinuous rings.

[0050] The cup body 200 is provided with a first locking portion 209, the lower end cover 500 is provided with a second locking portion 503, and the screw 702 passes through the second locking portion 503 and the first locking portion 209 in sequence to lock and connect the upper end cover 201 and the lower end cover 500. Specifically, the first locking portion 209 is a blind hole with an internal thread, and the second locking portion 503 is a through hole, which is respectively provided through the lower end plate 501 and the lower side wall 502 of the lower end cover 500, and the stator core 401 is provided with an avoidance portion for avoiding the screw 702, and the blind hole and the through hole are correspondingly provided up and down.

[0051] The cup body 200 is provided with a drain port 213 and a drain valve 210 for controlling the opening and closing of the drain port 213. The lower part of the cup body 200 is provided with an air inlet 211 connected to the installation cavity 700 on the side away from the drain valve 210 to avoid resonance between the rapid airflow and the drain valve 210 at the air inlet 211. Preferably, the drain valve 210 and the air inlet 211 are arranged on both sides of the cup body 200, and being away from the air inlet 211 is equivalent to reducing the operating noise of the rotary valve. The side wall of the upper end cover 201 is also provided with a wire outlet groove, preferably with a U-shaped opening to locate the wiring harness and prevent wind from flowing out of the wire outlet groove. A spring washer is provided between the lower bearing of the permanent magnet brushless motor and the lower end cover 500 to offset the axial positioning error of the rotor shaft caused by the tolerance of the dimensional chain. A gasket 304 is provided between the upper bearing and the shaft seal of the permanent magnet brushless motor. The shaft seal and the upper bearing respectively press the upper end surface and the lower end surface of the gasket 304. An insulating sleeve is provided between the stator assembly and the bottom of the cup body 200 to isolate the heat and reduce the heat loss of the heating element 202. The insulating sleeve is made of heat-resistant and heat-insulating materials.

[0052] The present embodiment further optimizes the food processing machine. The permanent magnet brushless motor includes a lower end cover 500 and a driving assembly disposed between the lower end cover 500 and the heating plate 203. The heating plate 203 also includes an upper end cover 201 extending away from the cup body 200 and correspondingly assembled with the lower end cover 500. The bottom wall of the heating plate 203 forms an end plate of the upper end cover 201. An installation cavity 700 for accommodating the driving assembly is formed between the upper end cover 201 and the lower end cover 500. The installation cavity 70 0 includes an upper end cover air inlet 211 arranged at the side of the upper end cover 201 for focusing air intake into the installation cavity 700, and a lower end cover air outlet 504 arranged at the side of the lower end cover 500 for focusing air outlet out of the installation cavity 700. Preferably, the air inlet 211 and the air outlet are both unique, and wind can only enter from the unique air inlet 211 and then be discharged from the unique air outlet. The flow rate of the wind is stable and turbulence is not prone to occur, thereby avoiding the problem that the wind enters the motor from the air inlet 211 and gathers and cannot be quickly discharged, thereby affecting the heat dissipation efficiency. Preferably, there is at least one axial section passing through the center of the permanent magnet rotor, so that the air inlet 211 and the air outlet are completely located on the same side of the axial section, and the straight-line distance between the air inlet 211 and the air outlet is short, so that the wind entering the permanent magnet brushless motor can be immediately discharged from the air outlet, avoiding the heat of the heating disk 203 being taken away when the wind flows through the installation cavity 700, thereby fully dissipating the heat of the permanent magnet rotor assembly 300 and the stator winding assembly 400 while avoiding excessive impact on the heat of the heating disk 203 of the cup body 200. In addition, the air inlet 211 and the air outlet arranged on the same side of the section can also avoid the whistling sound when the air runs to the air outlet in the installation cavity 700. Preferably, an air inlet 211 and an air outlet are arranged on one side of the axial section, and a cup body drain valve 210 is arranged on the other side. The cup body 200 is provided with a drain port 213 connected to the inner cavity of the cup body 200. The drain valve 210 is arranged on the cup body 200 and is used to open or close the drain port 213. The air inlet 211 and the drain valve 210 are reasonably distributed in the circumferential direction of the cup body 200, and the circumferential space utilization rate is high. The drain valve 210 is far away from the air inlet 211 and the air outlet. When the drain valve 210 is opened, slurry or cleaning wastewater is not easily extended to the permanent magnet brushless motor.

[0053] The drain valve 210 includes an opening and closing part, a driving part and a slurry discharge nozzle. Preferably, the slurry discharge nozzle is used to guide the liquid flow to be discharged to the liquid receiving cup and can be driven by the driving part to move to the end of the slurry discharge nozzle to align with the slurry discharge cup to open the drain port 213 to discharge the slurry, and when the end of the slurry discharge nozzle is aligned with the waste receiving cup 104, the drain port 213 is opened to discharge the cleaning waste water. The movement space of the slurry discharge nozzle under the drive of the driving part is not interfered by the air inlet 211 and the air outlet, nor is it interfered by the upper shell and the lower shell of the permanent magnet brushless motor, so that the rotation of the slurry discharge nozzle is stable and reliable. The main unit 100 is provided with a power module 600 for driving the permanent magnet brushless motor. The power module 600 is arranged on the side away from the drain valve 210. In this embodiment, the liquid valve and the power module 600 are arranged on both sides of the permanent magnet brushless motor. Preferably, the slurry discharge nozzle is located on one side of the permanent magnet brushless motor in the vertical direction. When the slurry discharge nozzle is located at any position, the end of the slurry discharge nozzle is located on the side of the permanent magnet brushless motor and does not fall within the projection range of the permanent magnet brushless motor on the horizontal plane, and a fan-shaped surface is formed between the two extreme positions of the rotation of the slurry discharge nozzle.

[0054] A host air inlet connected to the outside is provided on the host 100, and a power module 600 for driving the permanent magnet brushless motor is provided in the host 100. The power module 600 is located on the air circulation path between the host air inlet and the upper end cover air inlet 211. A centrifugal fan driven by the permanent magnet rotor assembly 300 is also provided in the lower end cover 500. The centrifugal fan generates negative pressure, so that the outside air can only pass through the host air inlet, the power module 600 for driving the permanent magnet brushless motor, the upper end cover air inlet 211, the installation cavity 700 formed between the cup body 200 and the lower shell body, and the lower end cover air outlet 504 in sequence, and then be discharged through the air duct connected to the lower end cover air outlet 504 downstream of the permanent magnet brushless motor. The power module 600 includes a driving board body 601, an IGBT arranged on the driving board body 601, and a heat sink 602 covering the IGBT. The heat sink 602 is located on the air circulation path between the main engine air inlet and the upper end cover air inlet 211. The wind path is unique and stable, passing through the power module 600 to effectively dissipate heat for the control chip and the heat sink 602 on the power module 600. Taking the plane where the driving plate body 601 is located as the projection plane, the projection of the upper end cover air inlet 211 in the plane is offset relative to the projection of the upper end cover 201 in the plane. When wind blows out from the upper end cover air inlet 211 and blows toward the driving plate body 601, the wind flow forms a non-vertical angle with the driving plate body 601. Preferably, the wind flow path is extended between the axis of the upper end cover air inlet 211 and the plane where the driving plate body 601 is located to form an angle A less than 90°, preferably 30°≤A≤75°, so as to maximize the coverage rate of the driving part body by the wind blown out from the upper end cover air inlet 211, thereby greatly improving the heat dissipation area and heat dissipation efficiency of the driving module, while avoiding the driving plate body 601 from obstructing the airflow and losing the speed of the heat dissipation airflow.

[0055] Taking the plane where the driving board body 601 is located as the projection plane, the projections of the main engine air inlet and the upper end cover air inlet 211 in the plane are at least partially staggered in the horizontal direction, which is equivalent to the base air inlet and the upper end cover air inlet 211 being arranged diagonally. The capacitors on the driving module and the driving board body 601 are on the diagonal connection line between the base air inlet and the upper end cover air inlet 211. The wind can only enter the installation cavity 700 through the base air inlet-capacitor-heat sink-upper end cover air inlet 211 to fully dissipate the heat of the power module 600 of the permanent magnet brushless motor. Specifically, the base air inlet is arranged on the bottom surface of the base, and the air inlet 211 includes a plurality of array-type air inlet holes. The bottom surface of the base is recessed upward to form a concave cavity. The air inlet 211 is arranged on the top surface of the concave cavity. The side wall of the concave cavity extends outward to form an extension channel. One end of the extension channel is connected to the concave cavity, and the other end extends to the side of the base and is connected to the outside. The extension channel at least partially passes under the water tank 105 and is disposed at the rear side of the main unit 100 to reduce the impact of noise at the air inlet 211 on the user's hearing.

[0056] The host 100 includes an inner base 101 of the base, which is respectively connected to the heating plate 203 and the base of the host 100. The inner base 101 of the base is provided with a mounting portion 102. The drive board body 601 is vertically mounted in the host 100 through the mounting portion and is located on the side of the air inlet 211 of the upper end cover of the permanent magnet brushless motor. Specifically, the host 100 is provided with an inner base 101, and the mounting portion includes a mounting groove arranged on the side wall of the inner base 101 of the base. The drive board body 601 is inserted into the mounting groove and is located on the side of the air inlet 211 of the upper end cover of the permanent magnet brushless motor. After the airflow passes through the heat sink 602, it quickly enters the installation cavity 700 from the air inlet 211, ensuring that the air inlet path is stable and free of turbulence. Figure 5 As shown, an air guide channel 800 is extended outward from the lower end cover air outlet 504, and the air guide channel 800 is tangentially arranged along the lower end cover 500. The area of ​​the lower end cover air outlet 504 is not less than the area of ​​the outlet of the air guide channel 800, so as to further focus the air outlet. The lower end cover air outlet 504 covers a large area on the inner wall surface of the lower end cover 500, so the wind thrown out by the blades of the centrifugal fan can be quickly focused and discharged along the air guide channel 800, avoiding circulation and accumulation in the lower end cover 500, so as to improve the heat dissipation efficiency.

[0057] like Figure 6As shown, the lower end cover outlet 504 is provided with an air guide channel 800 extending outward, and the outlet of the air guide channel 800 is connected with a flexible air duct 801, which is made of elastically deformable material, and includes at least two bending sections for changing the direction of the air duct, thereby forming at least two changes in wind direction in the bending section to aggravate the attenuation of high-frequency noise and achieve the purpose of noise reduction and sound absorption, and the end of the flexible air duct 801 is connected to the main unit outlet 106, and the main unit outlet 106 includes a plurality of circular air outlet holes, which can quickly guide the wind out and play a role in noise reduction, and of course, the circular air outlet holes can also be set as rectangular holes or runway circular holes, which can also prevent foreign objects from entering the main unit 100.

[0058] It can be understood that the structure of the cup body 200 can also be set to an integrated form. Specifically, the cup body 200 includes a cup body 204 and a heating plate 203. The heating element is embedded in the heating plate 203. The first mounting portion 206 is arranged at the center of the heating plate 203. The upper end cover 201 is integrally formed and arranged on the heating plate 203. The cup body 204 and the heating plate 203 are integrally cast to form a cast aluminum cup body 200. The heating element is a heating tube embedded in the bottom of the cup body 200. The upper end cover 201 is integrally formed and arranged at the bottom of the cast aluminum cup body 200. The cup body 204 and the heating plate 203 are integrally cast to form a cast aluminum cup body 200. The structure of the cup body 200 is further simplified. The upper end cover 201 is integrally formed with the entire cast aluminum cup body 200. The large components of the crushing power system can be assembled and exported from the motor factory, which greatly reduces the production process and assembly costs. The relative position of the crushing knife 205 and the internal space of the cup body 200 is unique and the crushing knife shaft disturbance is small. Of course, if Figure 7 As shown, it is another structure of a food processor. The cup body 200 can also be set as a glass cup body 204 and a cast aluminum heating plate 203 installed as a whole. The heating plate 203 forms a lower processing cavity with a smaller volume, and the cup body 204 forms an upper processing cavity connected to the lower processing cavity and with a larger volume. At this time, the upper end cover 201 is directly integrated on the heating plate 203, which simplifies the installation process of the motor assembly and visualizes the processing, thereby optimizing the user experience. Of course, as another embodiment, the volume of the lower processing cavity can be set larger, and the volume of the upper processing cavity can be set smaller, so as to make full use of the heat transfer performance of the aluminum die casting and the better thermal insulation performance compared to the glass cup body 200, so that the slurry is maintained in a stable and higher temperature range during the processing, the temperature fluctuation range is small, the nutrition is released more fully, and the taste is better.

[0059] It can be understood that the heating element can also be embedded in the bottom of the cup body and located above the permanent magnet rotor assembly. The hot end of the heating element is located within the horizontal projection range of the brushless motor, thereby further reducing the radial size of the body and facilitating the radial miniaturization design and spatial layout of the whole machine. It is equivalent to the vertical downward movement of the permanent magnet rotor assembly and the stator coil assembly, making more full use of the axial space of the crushing power assembly.

[0060] In addition to the above preferred embodiments, the technical solutions protected by the present invention are not limited to the above embodiments. It should be pointed out that the combination of multiple technical solutions in any one embodiment, and the combination of the technical solution of any one embodiment with the technical solutions in one or more other embodiments, are 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 without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A low noise food processor, characterized in that: It includes a cup body, at least the lower end of which is made of metal and is integrally formed with an upper end cover of a permanent magnet brushless motor, and also includes a lower end cover of a permanent magnet brushless motor separately arranged from the cup body, the upper end cover and the lower end cover are locked and fixed, the cup body is provided with a heating element, an installation cavity is formed between the upper end cover and the lower end cover, a permanent magnet rotor assembly and a stator winding assembly are arranged in the installation cavity, a crushing knife directly driven to rotate by the permanent magnet rotor is arranged in the cup body, a first installation portion for installing an upper bearing of a permanent magnet rotor is provided at the bottom of the cup body, the lower end cover is provided with a second installation portion for installing a lower bearing of a permanent magnet rotor, and the permanent magnet rotor shaft is respectively arranged through the first installation portion and the second installation portion.

2. The food processing machine according to claim 1, characterized in that The cup body comprises a bottom, the inner side of the bottom forms an inner wall of the cup body for holding food, and the outer side of the bottom forms an upper end plate of the upper end cover.

3. The food processing machine according to claim 1, characterized in that The distance between the upper bearing and the lower bearing, and the distance between the upper bearing and the center of the crushing knife are not greater than the outer diameter of the stator winding assembly.

4. The food processing machine according to claim 1, characterized in that The upper end cover includes an upper end plate formed by the outer side of the bottom of the cup body, and an upper side wall integrally formed around the upper end plate, and the lower end cover includes a lower end plate and a lower side wall, and the permanent magnet rotor assembly and the stator winding assembly are at least partially located within the upper side wall and the lower side wall.

5. The food processor according to claim 4, characterized in that An installation gap is provided between the opening of the upper end cover and the opening of the lower end cover. The stator winding assembly includes a stator core and a stator coil. The stator core is at least partially exposed in the installation gap. A positioning protrusion is provided in the upper side wall, and the positioning protrusion abuts against the stator core.

6. The food processor according to claim 1, characterized in that A third mounting portion for mounting a shaft seal is also provided above the first mounting portion. The third mounting portion is connected to the first mounting portion and a step is formed at the connection. The thickness of the bottom of the cup body is not greater than the overall height of the first mounting portion and the third mounting portion.

7. The food processor according to claim 1, characterized in that The first mounting portion and the second mounting portion are respectively provided with limiting structures that cooperate with the upper bearing and the lower bearing of the permanent magnet brushless motor.

8. The food processor according to claim 1, characterized in that The cup body is provided with a first locking portion, the lower end cover is provided with a second locking portion, and the screw passes through the second locking portion and the first locking portion in sequence to lock and connect the upper end cover and the lower end cover.

9. The food processor according to claim 1, characterized in that The cup body comprises a cup body and a heating plate, the heating element is embedded in the heating plate, the first mounting portion is arranged at the center of the heating plate, the upper end cover is integrally formed and arranged on the heating plate, the cup body and the heating plate are integrally cast to form a cast aluminum cup body, the heating element is a heating tube embedded in the bottom of the cup body, and the upper end cover is integrally formed and arranged at the bottom of the cast aluminum cup body; Alternatively, the cup body includes a cup body and a heating plate, the heating element is embedded in the heating plate, the first mounting portion is arranged at the center of the heating plate, the upper end cover is integrally formed and arranged on the heating plate, the cup body is a glass body, the heating plate is a cast aluminum heating plate, and the lower port of the cup body is sealed and connected to the heating plate.

10. The food processor according to claim 1, characterized in that The cup body is provided with a liquid discharge port and a liquid discharge valve, and the lower part of the cup body is provided with an air inlet communicated with the installation cavity on one side away from the liquid discharge valve.

Images