Low-noise food processor driven by brushless motor

Abstract

The invention provides a low-noise food processor driven by a brushless motor. The low-noise food processor comprises a main machine, the cup body assembly comprises a cup body and a crushing cutter arranged in the cup body; the brushless motor comprises a first shell, a second shell, a stator iron core and a rotor assembly, the first shell and the second shell are provided with openings, the stator iron core and the rotor assembly are arranged in the shells, and the rotor assembly comprises a rotor shaft for driving the crushing cutter to rotate; a first buckling side wall for providing a radial positioning reference for the second shell is arranged at the opening of the first shell, and a second buckling side wall is arranged at the opening of the second shell; the first housing is also provided with a first positioning space for providing an installation positioning reference for the stator core, the second housing is provided with a second positioning space for auxiliary positioning of the stator core, and the stator core is limited in the first positioning space and the second positioning space. And the inner diameter of the first positioning space is smaller than that of the second positioning space, so that the assembling coaxiality of the first shell and the second shell is improved, and the coaxiality of the rotor shaft is improved.

Description

Technical Field

[0001] The invention belongs to the field of food processing machines, and in particular relates to a food processing machine driven by a brushless motor with stable power transmission and low noise. Background Art

[0002] Existing food processing machines generally use a series motor to drive the crushing blade to rotate. Since the series motor drives the crushing blade to rotate in a single direction and the carbon brush commutation produces abnormal noise, the food processing machine makes a lot of noise during processing and the crushing effect on the material in the cup is not ideal. In order to overcome the above problems, the industry has adopted a food processing machine that uses a permanent magnet DC brushless motor. The permanent magnet DC brushless motor can drive the crushing blade to rotate in both directions to crush the material, making the prepared slurry more delicate and the cleaning after the slurry is completed more clean and thorough. Figure 1 As shown, the existing permanent magnet DC brushless motor used in food processing machines generally includes an upper end cover and a lower end cover, an outer stator core and an inner rotor assembly. The upper end cover contacts the upper side surface of the stator core through a limiting surface and is limited and clamped to be installed. The lower end cover contacts the lower side surface of the stator core through a limiting surface and is limited and clamped to be installed by the limiting step end face. The upper end cover, the stator core and the lower end cover are then locked and fixed by screws.

[0003] In addition, the upper and lower end caps are each provided with a bearing mounting cavity for mounting and limiting the upper and lower bearings of the rotor shaft, thereby limiting the position of the inner rotor assembly and driving the pulverizer blades for high-speed machining. In actual manufacturing, because the stator core is composed of multiple laminated silicon steel sheets with a thickness of 0.3mm or 0.5mm, the outer wall surface of the stator core is not a smooth, complete cylindrical surface, but rather a fault plane formed by the stacking of multiple silicon steel sheets. This rough outer surface of the stator core results in low manufacturing precision and large manufacturing tolerances on the outer circumference of the stator core. In the existing solution, the upper and lower end caps are snapped into position with the outer wall of the stator core. This results in the coaxiality tolerances of the upper and lower end cap bearings overlapping on the rough upper and lower sides of the stator core, resulting in poor coaxiality between the upper and lower bearings of the rotor shaft. This makes the rotor shaft prone to tilt, causing the motor to yaw and wobble during operation. This produces high vibration noise from the brushless motor, and the pulverizer blades experience significant disturbance relative to the cup body, exacerbating the pulverizing noise. Since the brushless motor can drive the crushing blade to rotate forward and reverse, the crushing blade is generally riveted to the upper end of the installed rotor shaft. During riveting, the rotor shaft is subjected to a large radial force, which reduces the fixation reliability between the bearing and the rotor shaft, thereby causing the risk of slippage between the rotor shaft and the bearing.

[0004] Patent application number CN201010251288.1 discloses a brushless DC motor and a drainage pump. The brushless DC motor comprises an upper end cap, a lower end cap, a motor shaft, a stator assembly, and a rotor magnet. The motor shaft is inserted through the upper and lower end caps, and the rotor magnet is sleeved around the outer side of the motor shaft. The outer edges of the upper and lower end caps interlock with each other, and each has an external positioning structure formed at the edge. The stator assembly is mounted in a cavity formed by the upper and lower end caps. The outer wall of the stator assembly and the inner wall of the cavity are formed with mutually cooperating internal positioning structures, which easily secure the stator assembly in the end caps, improve the coaxiality between the motor's stator and rotor, and the position accuracy of the stator within the end caps. It also improves the control accuracy of the rotor axial and radial clearances, resulting in good electromagnetic air gap uniformity and smooth motor operation. This brushless motor, used in drainage pumps, is compact and has low torque. Under such operating conditions, it can improve the position accuracy of the motor's output shaft to a certain extent. This solution still cannot solve the above problems in the field of food processing machines where the grinder blade is driven by a brushless motor and runs at high speed. Instead, it makes the stator core and the rotor assembly have no unified positioning reference during the installation process, and the radial deviation of the stator core and the rotor assembly is still large. The brushless motor is prone to abnormal noise when running at high speed. In particular, the rotor shaft of the brushless motor needs to be rotatably connected to the grinder blade. When the grinder blade is directly riveted on the rotor shaft or the transmission connector is installed, the rotor assembly is prone to shifting in the accommodating cavity formed by the upper end cover and the lower end cover, resulting in inaccurate positioning, tilting of the rotor assembly, damage to the bearing on the side of the rotor shaft close to the grinder blade, and water leakage in the shaft seal, which reduces assembly efficiency and the qualified rate of finished products. Summary of the Invention

[0005] The purpose of the present invention is to provide a unified solution for the installation reference of the stator core, the rotor and the motor housing, so as to achieve efficient and stable transmission while solving the problems of high transmission noise, low finished product assembly efficiency, low finished product life test pass rate and shaft seal leakage.

[0006] In order to solve the above technical problems, the present invention provides a low-noise food processor driven by a brushless motor, comprising a main unit; a cup body assembly, comprising a cup body and a crushing knife arranged in the cup body; a brushless motor, comprising a first shell and a second shell with an opening, a stator core and a rotor assembly arranged in the shell, the rotor assembly comprising a rotor shaft for driving the crushing knife to rotate; a first snap-fit ​​side wall is provided at the opening of the first shell to provide a radial positioning reference for the second shell, a second snap-fit ​​side wall is provided at the opening of the second shell, and the second shell is tightly snap-fitted with the first snap-fit ​​side wall through the second snap-fit ​​side wall; the first shell is also provided with a first positioning space to provide an installation positioning reference for the stator core, and the second shell is provided with a second positioning space for auxiliary positioning of the stator core, the stator core is confined within the first positioning space and the second positioning space, and the inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space.

[0007] Furthermore, the first positioning space has an annular positioning side surface and an annular positioning end surface connected to the positioning side surface, and the second positioning space has an annular positioning side surface. The distance from the positioning side surface of the first positioning space to the rotor axis is smaller than the distance from the positioning side surface of the second positioning space to the rotor axis.

[0008] Furthermore, a circumferential gap is provided between the annular positioning side surface of the second positioning space and the side wall of the stator core.

[0009] Furthermore, a distance between the annular positioning side surface of the second positioning space and the side wall of the stator core is W, 0.2 mm ≤ W ≤ 5 mm.

[0010] Furthermore, the annular positioning end surface abuts against the end surface of the stator core located in the first housing to axially support the stator core.

[0011] Furthermore, the second positioning space also has an annular positioning end face, the distance between the positioning end faces of the first positioning space and the second positioning space is greater than the height of the stator core, and a gap is set between the positioning end face of the first positioning space and the positioning end face of the second positioning space and an end face of the core, and the fitting gap is W1, 0.2mm≤W1≤2mm.

[0012] Furthermore, the first snap-fitting side wall is snapped onto the outer side of the second snap-fitting side wall, and the distance from the second snap-fitting side wall to the rotor axis is greater than the distance from the positioning side of the first positioning space to the rotor axis; or, the second snap-fitting side wall is snapped onto the outer side of the first snap-fitting side wall, and the distance from the first snap-fitting side wall to the rotor axis is greater than the distance from the positioning side of the first positioning space to the rotor axis.

[0013] Furthermore, the positioning side surfaces of the first positioning space and the positioning side surfaces of the second positioning space are respectively connected to the first snap-fit ​​side walls and the second snap-fit ​​side walls and form step portions at the connections. The height of the positioning side surfaces of the first positioning space and / or the second positioning space is not greater than the height of the snap-fit ​​side walls.

[0014] Furthermore, the first shell includes a first end plate, which is integrally formed with the bottom of the cup body, the inner side of the bottom forms an inner wall for holding food, the outer side of the bottom forms the first end plate, and the crushing knife is arranged at the upper end of the rotor shaft; or, the first shell includes a first end plate, the first end plate and the bottom of the cup body are separately arranged, the first shell or the second shell is fixed to the bottom of the cup body by screws, and the crushing knife is arranged at the upper end of the rotor shaft; or, the brushless motor is arranged in the main unit, the cup body is detachably connected to the main unit, and the upper end of the rotor shaft is transmission-connected to the crushing knife in the cup body through a coupling.

[0015] Furthermore, the average outer diameter of the stator core is D, the height of the stator core is H, 5≤D / H≤9; or the inner diameter of the first positioning space is D1, the height of the first positioning space is H1, 9≤D1 / H1≤14.

[0016] The beneficial effects of the present invention are:

[0017] 1. The rotor shaft of the brushless motor drives the crushing knife to rotate in the cup body to crush the processed material. The side walls of the first shell and the second shell of the brushless motor are tightly fitted together, so that the stator core is not exposed at the openings of the first shell and the second shell and is completely covered by the fitting side walls. The opening of the first shell is provided with a first fitting side wall that provides a radial positioning reference for the second shell. When the brushless motor is assembled, the stator core and the rotor assembly are first installed and placed in the first shell, and then the second shell is limited by the first fitting side wall as the positioning reference. After the second fitting side wall is tightly fitted with the first fitting side wall, the second shell is also installed in place. The stator core, the rotor assembly and the second shell all use the first shell as the installation positioning reference. The stator core is limited in the first positioning space and the second positioning space. The inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space, so that the concentricity of the bearings of the first shell and the second shell is significantly improved, the swing of the rotor assembly is reduced, and thus the vibration and vibration noise under high-speed working conditions are reduced.

[0018] The second shell is provided with a second positioning space for assisting in positioning the stator core. The inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space, so that the stator core is preferentially installed in the first shell, and then the second shell is fastened to the first shell through the second fastening side wall to finally position the stator core. The two positioning spaces with different inner diameters unify the installation and positioning references of the stator core and the second shell, and avoid the phenomenon of the second shell installed later and the stator core being stuck or installed offset, which greatly improves the assembly efficiency of the brushless motor, and avoids the large coaxiality error formed on the periphery of the stator core when the silicon steel sheets of the stator core are superimposed, resulting in a large coaxiality tolerance of the rotor bearing caused by the first shell and the second shell using the stator core as the positioning reference, and also avoids the problem of the stator core being stuck and difficult to install when the other shell is fastened when it is installed in one of the shells, thereby fully improving the coaxiality of the rotor shaft and the crushing performance of the food processor.

[0019] 2. The first positioning space has an annular positioning side surface and an annular positioning end surface connected to the positioning side surface, and the second positioning space has an annular positioning side surface. The distance between the positioning side surface of the first positioning space and the rotor shaft is smaller than the distance between the positioning side surface of the second positioning space and the rotor axis center. When the stator core is installed in the first housing, the positioning side surface and the positioning end surface of the first positioning space install and position the stator core. The installation is positioning. When the second housing is fastened to the first housing, since the positioning reference of the second housing is the first fastening side wall of the first housing, and the distance between the positioning side surface of the first positioning space and the rotor shaft is smaller than the distance between the positioning side surface of the second positioning space and the rotor axis center, the positioning side surface of the second positioning space will not be interfered with by the stator core. It can also ensure that after the stator core is positioned in the first positioning space and the second positioning space, the coaxiality of the upper bearing and the lower bearing on the rotor assembly is improved, thereby minimizing transmission noise, further optimizing the sound quality of the brushless motor, and extending the service life of the brushless motor shaft seal, thereby greatly extending the service life of the brushless motor as a whole and the food processor.

[0020] 3. A circumferential gap is set between the annular positioning side of the second positioning space and the side wall of the stator core. The second positioning space can completely surround the outer surface of the stator core silicon steel sheet in a gap-like manner. The rotor shaft will not transmit the vibration of the shell to the stator core during operation, so that the first positioning space and the second positioning space will cover the dynamic noise source and internally attenuate it. The spacing between the annular positioning side of the second positioning space and the side wall of the stator core is W, 0.2mm≤W≤5mm. This setting further improves the motor assembly efficiency and the qualified rate of finished products. During the overall transportation of the brushless motor to the whole machine assembly plant, the motor structure and performance are more reliable and stable. The outer wall of the rotor core is not easily stuck in the second positioning space, making the assembly of the first and second snap-fit ​​side walls smoother and more accurate, further improving the transmission sealing reliability and stability between the rotor shaft, rotor bearing, oil seal and crushing knife, and greatly reducing mechanical noise.

[0021] 4. The annular positioning end face abuts against the end face of the stator core located in the first shell to axially support the stator core and guide the stator core to be axially supported and limited and radially positioned in the first positioning space. When the second shell contacts the first shell and is installed in place by snapping the side walls, the second positioning space further axially positions the stator core. At this time, the brushless motor can be installed to the main machine in a forward direction with the first shell below the second shell, or can be installed to the main machine in an inverted direction with the first shell above the second shell, thereby improving the installation freedom of the brushless motor as an independent power component and the adaptability of different models of food processors to the brushless motor, thereby greatly improving the versatility of the brushless motor and saving R&D and production manufacturing costs.

[0022] 5. The second positioning space also has an annular positioning end face, and the distance between the positioning end faces of the first positioning space and the second positioning space is greater than the height of the stator core. A gap is set between the positioning end face of the first positioning space and the positioning end face of the second positioning space and an end face of the core, and the fitting gap is W1, 0.2mm≤W1≤2mm, so that the stator core can be supported and positioned by the annular positioning end faces of the first positioning space and the second positioning space regardless of whether it is upright or inverted, so as to maintain the circumferential, axial and radial precise positioning of the stator core in the positioning space, avoid bias and jamming in the positioning space, and cause the upper and lower bearings of the rotor shaft to shift in the axial direction, thereby generating abnormal noise when the rotor drives the crushing knife to crush and pulp, and even high noise when beating water and bean milk, and affecting the turbulent flow effect of the slurry.

[0023] 6. Since the first snap-fitting side wall and the second snap-fitting side wall are both positioned based on the first shell during installation, and the bearing mounting hole of the first shell and the first snap-fitting side wall are processed under one processing positioning reference, the processing accuracy is high. The internal and external snap-fitting method of the first snap-fitting side wall and the second snap-fitting side wall can ensure the coaxiality of the bearing on the first shell and the bearing on the second shell. Even when the rotation speed of the crushing knife reaches more than 10,000 rpm, the beating sound is still soft and there is no piercing or sharp noise.

[0024] 7. The positioning side surfaces of the first positioning space and the positioning side surfaces of the second positioning space are respectively connected to the first snap-fit ​​side walls and the second snap-fit ​​side walls and form steps at the connection points, thereby preventing the outer wall of the stator core from interfering with the snap-fit ​​installation of the first snap-fit ​​side walls and the second snap-fit ​​side walls. This can ensure the positioning installation of the stator core in the first positioning space and the second positioning space, and the first positioning space and the second positioning space respectively perform the reference positioning and auxiliary alignment of the stator core in sequence, and can also ensure the circumferential high-precision installation of the second shell and the first shell to achieve the coaxiality between the rotor shaft and the bearings located in the first and second shells, thereby optimizing the transmission stability and the service life and reliability of the shaft seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0026] Figure 1 Schematic diagram of the brushless motor structure of a conventional food processor in the background technology.

[0027] Figure 2 The figure is a schematic diagram of the brushless motor structure of the food processing machine of the present invention.

[0028] Figure 3 This is a cross-sectional view of the brushless motor of the food processing machine according to the present invention.

[0029] Figure 4 The figure is a schematic diagram of the assembly of the brushless motor housing and stator core of the food processing machine of the present invention.

[0030] Figure 5 The figure is a schematic diagram of the silicon steel sheet structure of the stator core of the brushless motor of the food processing machine described in the present invention.

[0031] Figure 6 This is a schematic structural diagram of the first housing of the brushless motor of the food processing machine of the present invention.

[0032] Figure 7This is a schematic structural diagram of the second housing of the brushless motor of the food processor of the present invention.

[0033] Figure 8 This is a schematic diagram of another brushless motor structure of the food processor described in the present invention.

[0034] Figure 9 This is a schematic diagram of another brushless motor structure of the food processor described in the present invention.

[0035] Figure 10 This is a schematic diagram of the overall structure of the food processing machine of the present invention.

[0036] Figure 11 This is another schematic diagram of the overall structure of the food processing machine of the present invention.

[0037] Figure 12 This is another schematic diagram of the overall structure of the food processing machine of the present invention.

[0038] The names of the components in the figure are as follows: 100, main unit; 200, cup body assembly; 201, cup body; 202, crushing knife; 203, drain valve; 204, heating device; 300, brushless motor; 301, first housing; 302, second housing; 303, stator core; 304, rotor assembly; 305, rotor shaft; 306, first buckling side wall; 307, second buckling side wall; 308, positioning side surface; 309, positioning end surface; 310, step portion; 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345 1. First end plate; 312. Limiting groove; 313. First mounting cavity; 314. First bearing; 315. Second mounting cavity; 316. Second bearing; 317. Air inlet; 318. Air outlet; 319. Second end plate; 320. Noise reduction cavity; 321. First positioning gap; 322. Second positioning gap; 323. Support rib; 324. Third mounting cavity; 325. Third bearing; 326. Notch; 400. First positioning space; 500. Second positioning space. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 2 to 12As shown, the present invention provides a low-noise food processor driven by a brushless motor 300, comprising a main unit 100, a cup assembly 200 and a brushless motor 300, wherein the main unit 100 supports the cup assembly 200, and the cup assembly 200 comprises a cup body 201 and a crushing blade 202 disposed in the cup body; the brushless motor 300 comprises a first shell 301 with an opening and a second shell 302, a stator core 303 and a rotor assembly 304 disposed in the shell, the rotor assembly 304 comprising a rotor shaft 305 for driving the crushing blade 202 to rotate; a first engaging side wall 306 is provided at the opening of the first shell 301 to provide a radial positioning reference for the second shell 302, and the brushless motor 300 comprises a first shell 301 with an opening and a second shell 302, a stator core 303 and a rotor assembly 304 disposed in the shell, the rotor assembly 304 comprising a rotor shaft 305 for driving the crushing blade 202 to rotate; the first shell 301 has a first engaging side wall 306 at its opening to provide a radial positioning reference for the second shell 302, and the brushless motor 300 comprises a first shell 301 with an opening and a second shell 302, and a stator core 303 and a rotor assembly 304 disposed in the shell. A second snap-fitting side wall 307 is provided at the opening of the second shell 302, and the second shell 302 is tightly snap-fitted with the first snap-fitting side wall 306 through the second snap-fitting side wall 307, so that the stator core 303 is not exposed at the opening of the first shell 301 and the second shell 302 and is completely covered by the snap-fitting side wall; the first shell 301 is also provided with a first positioning space 400 that provides an installation positioning reference for the stator core 303, and the second shell 302 is provided with a second positioning space 500 for assisting in positioning the stator core 303. The stator core 303 is confined within the first positioning space and the second positioning space, and the inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space.

[0041] After the second snap-fitting side wall 307 is tightly snapped into place with the first snap-fitting side wall 306, the second shell 302 is also installed in place. The stator core 303, the rotor assembly 304 and the second shell 302 are all installed and positioned based on the first shell 301. The stator core 303 is confined within the first positioning space and the second positioning space. The inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space, so that the concentricity of the bearings of the first shell 301 and the second shell 302 is significantly improved, the swing of the rotor assembly 304 is reduced, and thus the vibration and vibration noise under high-speed working conditions are reduced.

[0042] like Figure 3 and Figure 4As shown, the inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space, and the stator core 303 is first installed in the first housing 301, and then the second housing 302 is fastened to the first housing 301 through the second fastening side wall 307 to finally position the stator core 303. The two positioning spaces with different inner diameters unify the installation and positioning references of the stator core 303 and the second housing 302, and avoid the second housing 302 installed later and the stator core 303 from being stuck or offset, which greatly improves the stability of the stator core 303. This improves the assembly efficiency of the brushless motor 300 and avoids large coaxiality errors around the stator core 303 when the silicon steel sheets of the stator core 303 are stacked. This would cause the first and second housings 301 and 302 to be positioned relative to the stator core 303, resulting in large coaxiality tolerances on the rotor shaft 305. This would also prevent the stator core 303 from getting stuck and causing installation difficulties when it is installed in one housing and then engaging the other housing. This effectively improves the coaxiality of the rotor shaft 305 and the grinding performance of the food processor. It should be noted that the first positioning space is smaller than the inner diameter of the second positioning space, and that during motor assembly, the stator core 303 and rotor assembly 304 are preferentially placed within the first housing 301, which serves as the installation positioning reference. This does not represent the sequential positioning of the assembled brushless motor 300 when it is installed in the food processor.

[0043] After the food processor is fully assembled, the first housing 301 can be located either above or below the second housing 302. In one embodiment, when the stator core 303 is in the installed state, the first housing 301 is located below the stator core 303. When the stator core 303 is installed and in operation, the first housing 301 is located above the stator core 303. This allows the first positioning space to be located on the side where the rotor shaft 305 passes through the first housing 301 and is transmission-connected to the pulverizing blade 202. This allows for smoother and more precise installation of the motor rotor shaft 305, and the pulverizing blade 202 can be installed either before or after the second housing 302, optimizing the assembly process and significantly improving production efficiency and the yield rate of finished products. Alternatively, the rotor shaft 305, transmission-connected to the pulverizing blade 202, can extend from either the first housing 301 or the second housing 302.

[0044] like Figure 3 、 Figure 6 and Figure 7As shown, the first positioning space has an annular positioning side surface 308 and an annular positioning end surface 309 connected to the positioning side surface 308, and the second positioning space has an annular positioning side surface 308. The distance between the positioning side surface 308 of the first positioning space and the center of the rotor shaft 305 is smaller than the distance between the positioning side surface 308 of the second positioning space and the center of the rotor shaft 305. The positioning side surface 308 of the first positioning space and the side surface of the stator core 303 form a first positioning gap 321 in the circumferential direction, and the positioning side surface 308 of the second positioning space and the side surface of the stator core 303 form a second positioning gap 322 in the circumferential direction. The first positioning gap 321 is smaller than the second positioning gap 322. When the stator core 303 is installed in the first housing 301, the positioning side surface 308 and the positioning end surface 309 of the first positioning space install and position the stator core 303. Installation is positioning, and the second housing When the body 302 is fastened to the first shell 301, since the positioning reference of the second shell 302 is the first fastening side wall 306 of the first shell 301, and the distance from the positioning side 308 of the first positioning space to the rotor shaft 305 is smaller than the distance from the positioning side 308 of the second positioning space to the center of the rotor shaft 305, the annular positioning side 308 of the second positioning space is not in circumferential contact with the side wall of the stator core 303, and the positioning side 308 of the second positioning space will not be interfered with by the stator core 303. It can also ensure that after the stator core 303 is positioned in the first positioning space and the second positioning space, the coaxiality of the upper bearing and the lower bearing on the rotor assembly 304 is improved, thereby minimizing transmission noise, further optimizing the sound quality of the brushless motor 300, and extending the service life of the brushless motor 300 shaft seal, thereby greatly extending the service life of the brushless motor 300 as a whole and the food processor.

[0045] Preferably, when assembling the brushless motor 300, the first shell 301 is first placed on the fixture with the opening facing upward, and then the stator core 303 is placed in the first shell 301 from the opening. The positioning side surface 308 of the first positioning space and the side surface circumferentially of the stator core 303 form a first positioning gap 321. Then, the second shell 302 is fastened to the first shell 301, and the outer peripheral side of the stator core 303 is covered by the fastening side wall. The positioning side surface 308 of the second positioning space and the side surface circumferentially of the stator core 303 form a first positioning gap 321. The first positioning gap 321 is smaller than the second positioning gap 322. The annular positioning end face 309 abuts and supports the end face of the stator core 303 located in the first positioning space, thereby making the stator core 303 more quickly and accurately installed in the first housing 301 and less prone to installation positioning deviation and unevenness in the axial direction. Therefore, the circumferential uniformity of the first positioning gap 321 and the second positioning gap 322 can be fully guaranteed, greatly reducing the probability of contact between the outer peripheral surface of the stator core 303 and the positioning side surface 308. To facilitate measurement and comparison of gap values, the circumferential average value of the first positioning gap 321 is preferably smaller than the circumferential average value of the second positioning gap 322. The average value can mainly eliminate the gap measurement error caused by the uneven outer peripheral surface of the stator core 303 formed by the superposition of multiple silicon steel sheets. The average value of the positioning gap can be measured at multiple circumferential points and calculated using the average value method commonly used in this field. Preferably, one of the first shell 301 and the second shell 302 is provided with a motor air inlet 317 and the other is provided with a motor air outlet 318. When the brushless motor 300 is set in the host 100, the motor air inlet is connected to the host air inlet, and the motor air outlet is connected to the host air outlet. As a preferred embodiment, the brushless motor 300 includes an air inlet 317 and an air outlet 318, the air inlet is arranged on the first shell 301, and the air outlet is arranged on the second shell 302, and the air outlet does not interfere with the second snap-fit ​​side wall 307 in the vertical direction. Of course, the positions of the air inlet and the air outlet relative to the first shell 301 and the second shell 302 can also be interchanged, both of which can ensure that after the first shell 301 and the second shell 302 are accurately installed, the heat dissipation airflow can fully flow through the stator core 303 and the rotor assembly 304 for heat dissipation, and the setting of the air inlet and the air outlet does not affect the snap-fit ​​installation of the first snap-fit ​​side wall 306 and the second snap-fit ​​side wall 307, thereby further ensuring the coaxiality of heat dissipation and motor rotor operation, as well as the flat and compact space of the brushless motor 300, thereby further optimizing the space and airflow path for efficient heat dissipation of the IGBT module of the brushless motor 300 in the host 100.

[0046] A second positioning gap 322 is provided between the annular positioning side surface 308 of the second positioning space and the outer side surface of the stator core 303, so that the annular positioning side surface 308 of the second positioning space and the circumferential gap between the side wall of the stator core 303 are set, and the second positioning space can completely surround the outer surface of the silicon steel sheet of the stator core 303 in a gap-like manner. When the rotor shaft 305 is running, the vibration of the shell will not be transmitted to the stator core 303, so that the first positioning space and the second positioning space will cover the dynamic noise source and attenuate it internally. The spacing between the annular positioning side surface 308 of the second positioning space and the side wall of the stator core 303 is also the second positioning gap 322, specifically W, 0.2mm≤W≤5mm, preferably W is 0.25mm, and the first positioning gap 321 is M, 0≤M≤3.5 mm, preferably M is 0.2mm. After the stator core 303 is installed in place, a gap is formed circumferentially between the side wall of the stator core 303 and the annular positioning side surface 308, and the space of the gap is completely sufficient to offset the roughness and roundness of the outer surface of the stator core 303 caused by the stacking of each layer of silicon steel sheets of the stator core 303. This arrangement further improves the motor assembly efficiency and the qualified rate of finished products. During the overall transportation of the brushless motor 300 to the whole machine assembly plant, the motor structure and performance are more reliable and stable. The outer wall of the rotor core is not easily stuck in the second positioning space, making the assembly of the first buckling side wall 306 and the second buckling side wall 307 smoother and more accurate, further improving the transmission sealing reliability and stability between the rotor shaft 305, the rotor shaft 305 bearing, the oil seal and the crushing knife 202, and greatly reducing mechanical noise.

[0047] The structures of the first shell 301 and the second shell 302 are further optimized. The annular positioning end face 309 abuts against the end face of the stator core 303 located in the first shell 301 to axially support the stator core 303 and guide the stator core 303 to be axially supported and limited and radially positioned in the first positioning space. When the second shell 302 contacts the first shell and is installed in place by snapping the side walls, the second positioning space further axially positions the stator core 303. At this time, the brushless motor 300 can be installed in the main unit 100 in a forward direction with the first shell 301 below the second shell 302, or can be installed in an inverted direction with the first shell 301 above the second shell 302. This improves the installation freedom of the brushless motor 300 as an independent power component and the adaptability of the brushless motor 300 to different models of food processors, thereby greatly improving the versatility of the brushless motor 300 and saving R&D and production manufacturing costs. The second positioning space also has an annular positioning end face 309. The distance between the positioning end faces 309 of the first positioning space and the second positioning space is greater than the height of the stator core 303. A gap is set between the positioning end face 309 of the first positioning space and the positioning end face 309 of the second positioning space and an end face of the core. The matching gap is W1, 0.2mm≤W1≤2mm. Preferably, when the second shell 302 is closed in place, the gap W1 between the positioning end face 309 of the second positioning space and the end face of the stator core 303 is 0 .5mm, after the brushless motor 300 is installed on the food processor, the stator core 303 can be supported and positioned by the annular positioning end faces 309 of the first positioning space and the second positioning space regardless of whether it is upright or inverted, so as to keep the stator core 303 accurately positioned in the circumferential, axial and radial directions within the positioning space to avoid being stuck in the positioning space and causing the upper and lower bearings of the rotor shaft 305 to shift in the axial direction, thereby generating abnormal noise when the rotor drives the crushing knife 202 to crush and pulp, and even high noise when beating water and bean milk, and affecting the turbulent flow effect of the pulp.

[0048] like Figure 3 As shown, it is preferred that as a fastening method of the first fastening side wall 306 and the second fastening side wall 307, the first fastening side wall 306 is fastened to the inner side of the second fastening side wall 307, and the distance from the second fastening side wall 307 to the center of the rotor shaft 305 is greater than the distance from the positioning side surface 308 of the first positioning space to the center of the rotor shaft 305, so as to quickly install the second housing 302; Figure 8As shown, as another fastening method for the first fastening side wall 306 and the second fastening side wall 307, the second fastening side wall 307 is fastened to the outside of the first fastening side wall 306, and the distance between the first fastening side wall 306 and the center of the rotor shaft 305 is greater than the distance between the positioning side surface 308 of the first positioning space and the center of the rotor shaft 305. Based on the above, since the first fastening side wall 306 and the second fastening side wall are both positioned with the first shell 301 as the positioning reference during installation, and the bearing mounting hole of the first shell 301 and the first fastening side wall 306 are both machined based on the same machining positioning reference, the machining accuracy is high. The internal and external fastening method of the first fastening side wall 306 and the second fastening side wall 307 can ensure good coaxiality between the bearing on the first shell 301 and the bearing on the second shell 302. Even when the rotation speed of the crushing blade 202 reaches above 10,000 rpm, the beating sound remains soft and does not cause any piercing or sharp noise.

[0049] The positioning side surface 308 of the first positioning space and the positioning side surface 308 of the second positioning space are connected to the first snap-fit ​​side wall 306 and the second snap-fit ​​side wall 307 respectively. A step portion 310 is formed at the connection between the positioning side surface 308 of the first shell 301 and the first snap-fit ​​side wall 306, and a step portion 310 is formed at the connection between the positioning side surface 308 of the second shell 302 and the second snap-fit ​​side wall 307, thereby avoiding the outer wall of the stator core 303 from interfering with the snap-fit ​​installation of the first snap-fit ​​side wall 306 and the second snap-fit ​​side wall 307. This can ensure the positioning installation of the stator core 303 in the first positioning space and the second positioning space, the reference positioning and auxiliary alignment of the stator core 303 in sequence by the first positioning space and the second positioning space respectively, and the circumferential high-precision installation of the second shell 302 and the first shell 301 to achieve coaxiality between the rotor shaft 305 and the bearings located in the first and second shells 302, thereby optimizing the transmission stability and the service life and reliability of the shaft seal. Preferably, the height of the positioning side 308 of the second positioning space is not greater than the height of the locking side wall, so as to fully ensure the assembly accuracy and transfer efficiency of the first shell 301 and the second shell 302, and relatively reduce the height of the second positioning space to improve the installation efficiency and the positioning accuracy of the stator core 303.

[0050] As a preferred embodiment of the brushless motor 300, the average outer diameter of the stator core 303 is D, and the height of the stator core 303 is H, 5≤D / H≤9, preferably D is 82mm, and H is 12mm; the inner diameter of the first positioning space is D1, and the height of the first positioning space is H1, that is, the distance between the end face of the positioning step 310 of the first shell 301 and the opening, 9≤D1 / H1≤14, preferably D1 is 82.5mm, and H1 is 7.54mm. As a structural parameter optimization of the brushless motor 300, 2 / 5≤H1 / H≤4 / 5, preferably H1 is 7.54mm and H is 12mm; or, the height of the second positioning space is H2, that is, the distance between the end face of the positioning step 310 of the second shell 302 and the opening, which limits the height ratio of the second positioning space to the stator core 303, 1 / 2≤H2 / H≤4 / 5, preferably H2 is 8.3mm and H is 12mm. The height measurement of the positioning space is specifically from the end face of the positioning step of the shell positioning space to the opening of the shell. While concentrating the body size, installation size and required installation space of the brushless motor 300, the positioning accuracy is optimized, thereby improving the high-precision machinability of the motor shell and the qualified rate of the assembled finished product. As a preferred embodiment of the brushless motor 300, the first snap-fitting sidewall 306 and the second snap-fitting sidewall 307, when snapped together, cause the first positioning space and the second positioning space to overlap at the point where the first snap-fitting sidewall 306 and the second snap-fitting sidewall 307 snap together, while the positioning sidewalls 308 of the first positioning space and the second positioning space are located at non-overlapping positions of the snap-fitting sidewalls, thereby ensuring that the positioning reliability of the positioning space and the effective snap-fitting of the snap-fitting sidewalls do not interfere with each other. The sidewalls of the first housing 301, from the opening to the first end plate 311 of the housing, sequentially include the first snap-fitting sidewall 306, the annular positioning sidewall 308, and the end cap support sidewall. The end plate support sidewall separates the first positioning space from the first end plate 311, thereby fully ensuring that the positioning of the positioning space is not interfered with. In addition, the space enclosed by the end plate support sidewalls can also effectively improve air circulation efficiency and noise reduction effects.

[0051] One end of the stator core 303 is supported on the horizontal surface of the positioning step. The spacing between the engaging side surface and the stator core 303 is greater than the spacing between the vertical surface of the positioning step and the outer surface of the stator core 303. Specifically, the positioning step includes a vertical positioning surface and a horizontal positioning end surface 309, which is also the horizontal surface of the positioning step. The second housing 302 is provided with a positioning step for positioning the stator core 303. The distance between the vertical positioning surface and the center of the rotor shaft 305 is greater than the distance between the positioning side surface 308 of the first housing 301 and the center of the rotor shaft 305. Preferably, the positioning step is annular, but it can also be configured as circumferentially spaced steps or other configurations.

[0052] like Figure 4 and Figure 5 As shown, a circumferential retaining structure is further provided between the stator core 303 and the first and second housings 301 and 302. The circumferential retaining structure includes a retaining groove 312, which cooperates with the locking screws of the first and second housings 301 and 302 to retain the stator core 303. Preferably, the screws sequentially pass through the second housing 302, the retaining groove 312, and the first housing 301, locking the first and second housings 301 and 302 and circumferentially securing the stator core 303. The retaining groove 312 is within the space defined by the first and second housings 301 and 302 and is enclosed by the first and second locking sidewalls 306 and 307. The outer circumference of the stator core 303 does not affect the engagement between the housings of the brushless motor 300, thereby maintaining the accuracy of the rotor shaft's bearings within the first and second housings 301 and 302. This improves the consistency and stability of the rotor shaft 305 output, and increases batch coaxiality consistency, further extending the life of the shaft seal and the motor.

[0053] It is understandable that the structure of the second housing 302 can be further optimized, such as Figure 7 As shown, support ribs 323 are provided on the inner side of the second end plate 319. Preferably, the support ribs 323 include multiple ones and are radially distributed from the second mounting cavity 315 to the outer periphery of the second end plate 319. Noise reduction cavities 320 are formed between adjacent support ribs 323. The multiple noise reduction cavities 320 further attenuate and absorb the rotation noise of the brushless motor 300, thereby reducing the noise of the power source of the food processor.

[0054] Understandably, Figure 9 As shown, the top surface of the first engaging side wall 306 abuts against the stepped surface at the base of the second engaging side wall 307 to limit the position. In this case, the stator core 303 can be further fixed to the inner side of the end plate of the first housing 301 by gluing, and the positioning step end surface can also be used to position and assist in gluing. Of course, the top surface of the second engaging side wall 307 can also abut against the stepped surface at the base of the first engaging side wall 306 to limit the position.

[0055] Understandably, Figure 6 As shown, the brushless motor housing is further provided with a notch for the three-phase output line of the brushless motor. In one embodiment, the notch is provided in the circumference of the first housing and passes through the positioning side surface and the first engaging side wall, forming a U-shape. In another embodiment, the notch can also be provided on the end plate at the top or bottom of the brushless motor to further enhance the circumferential wrapping between the first engaging side wall and the second engaging side wall.

[0056] like Figure 11As shown, as a first embodiment of installing a brushless motor 300 in a food processor, the first housing 301 includes a first end plate 311, and the second housing 302 includes a second end plate 319. Preferably, both the first end plate 311 and the second end plate 319 are continuous, closed surfaces. This reduces the height of the brushless motor 300 installation space, optimizes the lateral air inlet and outlet cooling ducts, and reduces the operating noise of the brushless motor 300, thereby improving the sound quality of the entire food processor. The first end plate 311 is separated from the bottom of the cup body. Screws are sequentially passed through the second housing 302 and the first housing 301 from bottom to top to complete the assembly of the brushless motor 300. Preferably, the first housing 301 is screwed to the bottom of the cup body, and the crushing blade 202 is located at the upper end of the rotor shaft 305. Of course, the second housing 302 can also be screwed to the bottom of the cup body to make the overall structure more compact. A first mounting cavity 313 and a second mounting cavity 315 for mounting bearings are provided on the first end plate 311 of the first housing 301 and the second end plate 319 of the second housing 302. Specifically, a first bearing 314 is provided in the first mounting cavity 313, and a second bearing 316 is provided in the second mounting cavity 315. It is understood that, as another embodiment, a third bearing 325 is further provided in the first mounting cavity 313. These two bearings position the rotor shaft 305 near one end of the pulverizing blade 202, further improving the positioning accuracy between the pulverizing blade 202 and the cup body 201 and the coaxiality of the rotor shaft 305. When the pulverizing blade 202 processes hard ingredients such as unsoaked soybeans, it can quickly perform coarse and fine pulverization without shaking the blade shaft, or causing any noise or abnormal sound.

[0057] like Figure 10As shown, as an embodiment of the second brushless motor 300 installed in the food processing machine, the first shell 301 includes a first end plate 311, and the first end plate 311 is integrally formed with the bottom of the cup body, the inner side of the bottom forms an inner wall for holding food, and the outer side of the bottom forms the first end plate 311, and the crushing knife 202 is arranged at the upper end of the rotor shaft 305. When assembling the brushless motor 300, this embodiment is more convenient for use in a wall-breaking machine that does not require hand washing, that is, the motor and cup body assembly 200 are fixed integrally to the main unit 100, and a water supply device such as a water tank is installed, and an automatic liquid discharge device such as a liquid discharge valve 203 is provided on the cup body, and a liquid receiving device such as a slurry receiving cup and a residual water box is matched, thereby providing users with a fully automatic service and experience solution. Specifically, the food processor includes a main unit 100, a crushing power assembly and a drain valve 203, the crushing power assembly includes a cup body 201, a crushing knife 202 arranged in the cup body, a rotor assembly 304 arranged below the cup body, a stator core 303 and a second shell 302, the rotor assembly 304 includes a permanent magnet rotor and a rotor shaft 305; the cup body includes an upper cup body and a lower cup body, the openings of the upper cup body and the lower cup body are screwed and sealed to form a complete cup body, the upper cup body is a glass cup, and the lower cup body is an aluminum die-cast cup, the slurry discharge valve is installed at the drain port of the lower cup body, and is used to open and close the drain port on the cup body; the cup body includes a bottom, the bottom and the side wall of the cup body form a processing cavity, the edge of the bottom extends downward to form a first shell 301, the cup body includes a heating device 204, the heating device 204 is arranged around the periphery of the first shell 301, so that the heating device 204 can transfer heat to the cup body more focusedly, and avoid the brushless motor 300 body being affected by the heat radiation of the heating device 204. A first snap-fitting side wall 306 is provided at the opening of the first shell 301 to provide a radial positioning reference for the second shell 302, and the second shell 302 is snap-fitted with the first snap-fitting side wall 306 through the second snap-fitting side wall 307; the first shell 301 is also provided with a first positioning space to provide an installation positioning reference for the stator core 303, and the second shell 302 is provided with a second positioning space to position the stator core 303, and the stator core 303 is confined within the first positioning space and the second positioning space, and the inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space.

[0058] Preferably, the middle part of the bottom partially protrudes upward to form a first installation cavity 313, and the middle part of the bottom partially protrudes downward to form a third installation cavity 324. A shaft seal and a first bearing 314 are provided in the first installation cavity 313, and a third bearing 325 is provided in the third installation cavity 324. Based on the fact that the bottom of the cup body is shared with the end plate of the first shell 301 of the brushless motor 300, the bottom of the cup body and the bottom of the first shell 301 of the brushless motor 300 are integrated to set up a double-cavity double-bearing, and an annular groove of a limiting retaining spring is provided on the rotor shaft 305 to limit the axial position of the double bearings to prevent the bearings from falling off, and at the same time, it can maximize the compression of the axial installation space of the first bearing 314 and the third bearing 325 and the overall height of the brushless motor 300, so as to concentrate the space under the brushless motor 300 for maximizing the expansion of the air duct or liquid-connected component space, thereby optimizing noise reduction and user's fully automatic experience. The height of the rotor shaft 305 protruding from the first housing 301 is H0, 20mm≤H0≤40mm, and the protruding end of the rotor shaft 305 is connected to the crushing knife 202, preferably H0 is 30mm. This arrangement allows the distance between the center of the brushless motor 300 and the crushing knife 202 to be sharply reduced, thereby maximizing the distance between the core moving parts of the crushing power assembly and the power source. The structure is compact and the high-speed operation is stable and reliable. While reducing the size chain, the coaxiality between the rotor shaft 305, the crushing knife 202 and the motor housing can be further guaranteed, thereby optimizing the crushing performance and sound quality of the food processor based on the power source and the crushing knife 202, further reducing the shaking of the rotor shaft 305 to extend the life of the shaft seal and the life of the entire machine.

[0059] The second housing 302 is provided with a second mounting cavity 315, within which a second bearing 316 is located. The distance L between the first bearing 314 and the second bearing 316 is 30 mm ≤ L ≤ 75 mm, preferably 60 mm. This not only makes the crushing power assembly compact in height but also allows ample space for the noise reduction cavity 320, thereby enhancing noise attenuation within the first and second housings 301 and 302. Preferably, the third mounting cavity 324 protrudes from the bottom. Support ribs 323 are provided between the third mounting cavity 324 and the sidewalls of the first housing 301. The support ribs 323 are annular or radial, preferably radial, and divide the gap between the bottom and the rotor assembly 304 and the stator core 303 into multiple noise reduction cavities 320. Of course, the noise reduction cavity 320 can be provided in either the first housing 301 or the second housing 302, or in both the first and second housings 301 and 302. The side wall of the first shell 301 is provided with an air inlet 317, and the side wall or end plate of the second shell 302 is provided with an air outlet 318. The air inlet longitudinally penetrates the positioning side surface 308 of the first positioning space, and the positioning side surface 308 of the first positioning space and the first snap-fitting side wall 306 form a continuous gap at the air inlet. The second positioning side surface 308 and the second snap-fitting side wall 307 are complete annular surfaces. After the second shell 302 is snapped into place, the second snap-fitting side wall 307 partially covers the periphery of the gap, so that the positioning is reliable and the airflow can enter the shell of the brushless motor 300 more quickly, thereby fully and efficiently dissipating the heat of the stator core 303 and the rotor assembly 304.

[0060] like Figure 12 As shown, as a third embodiment of the brushless motor 300 installed in the food processing machine, the brushless motor 300 is set in the main unit 100, the cup body is detachably connected to the main unit 100, and the upper end of the rotor shaft 305 is transmission-connected to the crushing blade 202 in the cup body through a coupling. It is suitable for processing high-speed wall-breaking machines and fully automatic wall-breaking machines that do not require hands-washing and are detachably assembled between the cup body and the main unit 100. Of course, other installation methods of the brushless motor 300 that can be implemented by those skilled in the art are applicable to this solution and will not be repeated here.

[0061] In addition to the preferred embodiments described above, the technical solutions protected by the present invention are not limited to the above embodiments. It should be noted that the combination of multiple technical solutions in any one embodiment, as well as the combination of the technical solution of any one embodiment with the technical solutions in one or more other embodiments, are within the scope of protection of the present invention. Although the present invention has been described in detail above using general descriptions and specific embodiments, it is obvious to those skilled in the art that modifications or improvements can be made based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A low-noise food processor driven by a brushless motor, characterized in that: include: Host; The cup body assembly includes a cup body and a crushing knife arranged in the cup body; A brushless motor includes a first housing and a second housing with openings, a stator core and a rotor assembly disposed in the housing, wherein the rotor assembly includes a rotor shaft for driving the pulverizing blade to rotate; A first buckling side wall is provided at the opening of the first shell to provide a radial positioning reference for the second shell, and a second buckling side wall is provided at the opening of the second shell, and the second shell is tightly buckled with the first buckling side wall through the second buckling side wall; The first shell is also provided with a first positioning space for providing an installation positioning reference for the stator core, and the second shell is provided with a second positioning space for auxiliary positioning of the stator core. The stator core is confined within the first positioning space and the second positioning space, and the inner diameter of the first positioning space is smaller than the inner diameter of the second positioning space.

2. The food processing machine according to claim 1, wherein The first positioning space has an annular positioning side surface and an annular positioning end surface connected to the positioning side surface, and the second positioning space has an annular positioning side surface. The distance from the positioning side surface of the first positioning space to the rotor axis is smaller than the distance from the positioning side surface of the second positioning space to the rotor axis.

3. The food processing machine according to claim 1, wherein A circumferential gap is provided between the annular positioning side surface of the second positioning space and the side wall of the stator core.

4. The food processing machine according to claim 1, wherein The distance between the annular positioning side surface of the second positioning space and the side wall of the stator core is W, and 0.2 mm ≤ W ≤ 5 mm.

5. The food processing machine according to claim 2, characterized in that The annular positioning end surface abuts against the end surface of the stator core located in the first housing to axially support the stator core.

6. The food processing machine according to claim 2, characterized in that The second positioning space also has an annular positioning end face, the distance between the positioning end faces of the first positioning space and the second positioning space is greater than the height of the stator core, and a gap is set between the positioning end face of the first positioning space and the positioning end face of the second positioning space and an end face of the core, and the fitting gap is W1, 0.2mm≤W1≤2mm.

7. The food processing machine according to claim 1, wherein The first snap-fitting side wall is snapped onto the outer side of the second snap-fitting side wall, and the distance from the second snap-fitting side wall to the rotor axis is greater than the distance from the positioning side of the first positioning space to the rotor axis; or, the second snap-fitting side wall is snapped onto the outer side of the first snap-fitting side wall, and the distance from the first snap-fitting side wall to the rotor axis is greater than the distance from the positioning side of the first positioning space to the rotor axis.

8. The food processing machine according to claim 1, wherein The positioning side surfaces of the first positioning space and the second positioning space are respectively connected to the first snap-fit ​​side wall and the second snap-fit ​​side wall and form a step portion at the connection. The height of the positioning side surfaces of the first positioning space and / or the second positioning space is not greater than the height of the snap-fit ​​side wall.

9. The food processing machine according to claim 1, wherein The first shell includes a first end plate, which is integrally formed with the bottom of the cup body, the inner side of the bottom forms an inner wall for holding food, and the outer side of the bottom forms the first end plate, and the crushing knife is arranged at the upper end of the rotor shaft; or the first shell includes a first end plate, which is separately arranged from the bottom of the cup body, and the first shell or the second shell is fixed to the bottom of the cup body by screws, and the crushing knife is arranged at the upper end of the rotor shaft; Alternatively, the brushless motor is arranged in the main unit, the cup body is detachably connected to the main unit, and the upper end of the rotor shaft is transmission-connected to the crushing knife in the cup body through a coupling.

10. The food processor according to claim 1, wherein The average outer diameter of the stator core is D, the height of the stator core is H, and 5≤D / H≤9; Alternatively, the inner diameter of the first positioning space is D1, the height of the first positioning space is H1, and 9≤D1 / H1≤14.

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