Variable-frequency driving juicer

Abstract

The utility model relates to a variable-frequency driving juicer, which comprises a main machine shell, a main machine upper cover, a variable-frequency driving device, a variable-frequency driving device and a driving device, and is characterized in that a mounting groove is formed in the main machine upper cover; the cutter assembly is positioned above the host upper cover; the brushless motor comprises a motor shell, a stator assembly and a rotor assembly, the motor shell is fixedly installed at the bottom of the host upper cover, the stator assembly and the rotor assembly are arranged in the motor shell, and the rotor assembly is provided with a rotor shaft which sequentially penetrates through the motor shell and the installation groove and is in transmission connection with the cutter assembly; a boss embedded in the mounting groove is formed on the upper end surface of the motor shell, and the mounting groove is a positioning reference for mounting the host upper cover and the motor shell. According to the technical scheme, the rotor shaft directly transmits power to the cutter assembly, multi-shaft transmission is not needed, the installation error between the rotor shaft and the cutter assembly is further reduced, the coaxiality is better improved, the cutter assembly works stably, materials are cut more evenly, and the smashing rate is better improved.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing machines, in particular to a frequency conversion driven juicer with low noise and high crushing rate. Background Art

[0002] With rising living standards, a variety of juicers have emerged, becoming a new favorite among those who prioritize health. Existing juicers typically consist of a main unit equipped with a motor, a juice cup connected to the main unit, and a pulverizer located at the bottom of the cup, connected to the motor. To juice, first cut the fruits and vegetables you want to juice into small pieces. Then, open the juice cup and place the chunky ingredients into the cup. The motor is then activated, driving the pulverizer at high speed, pulverizing the fruit and vegetable contents into juice.

[0003] The application number is CN201720988948.1, and the invention is titled "A Food Processor with an Eccentric Motor." It discloses that the mixing blade is connected to the motor shaft via a blade shaft. The motor is clamped and installed by the main unit and a battery mounted on the base. A motor cover integrally formed with the main unit is provided on the outside of the motor to limit the radial position of the motor. However, the technical problem with this technical solution is that the motor output shaft passes through the main unit and is connected to the mixing blade shaft. The mixing blade shaft and the motor output shaft are two different shafts, i.e., the blade shaft and the motor output shaft are not coaxially arranged. There is an installation error between the two, which affects the coaxiality, thereby making the mixing blade unstable. Not only is there a lot of noise, but the material cannot be cut and crushed evenly, resulting in a reduced crushing rate.

[0004] The application number is CN201420750424.5, and the name of the invention is “A portable food supplement processor with heating function”. It discloses a transmission connection between the stirring blade and the upper end of the motor shaft, the shoulder of the motor shaft is embedded in the countersunk hole at the bottom of the sealing ring, and the bottom of the motor is supported on the limiting structure. However, the technical problem existing in this technical solution is that the inner cup is installed above the inside of the outer cup, and there is space for installing the motor between the bottom of the inner cup and the bottom of the outer cup. The boss of the motor extends into the shaft sealing ring, which is a one-time positioning, and the assembly of the shaft sealing ring and the bottom of the inner cup for loading is another one-time positioning. Therefore, when the boss is completely installed in the bottom of the inner cup, the boss and the bottom of the inner cup are positioned twice, that is, the assembly between the motor and the bottom of the inner cup has multiple positioning references, which will produce a large positioning error, affecting the coaxiality between the motor shaft and the stirring blade, and then making the stirring blade work unsteadily. Not only is the noise loud, but the material cannot be cut and crushed evenly, resulting in a reduced crushing rate.

[0005] The above disclosed technical solutions all have the following technical problems: how to solve the problems of low coaxiality between the motor shaft passing through the main body shell and the stirring blade, unstable operation of the stirring blade, loud noise and low crushing rate. Utility Model Content

[0006] The purpose of the utility model is to provide a frequency conversion driven juicer to solve the technical problems of low coaxiality between the motor shaft passing through the main body shell and the stirring blade, unstable operation of the stirring blade, high noise and low crushing rate.

[0007] In order to solve the above technical problems, the utility model provides a frequency conversion driven juicer, comprising:

[0008] The host housing comprises a host upper cover, wherein the host upper cover is formed with a mounting groove;

[0009] A knife assembly is located above the upper cover of the main machine;

[0010] The brushless motor comprises a motor housing fixed to the bottom of the main body upper cover, and a stator assembly and a rotor assembly disposed in the motor housing. The rotor assembly has a rotor shaft that sequentially passes through the motor housing and the mounting slot and is transmission-connected to the knife assembly.

[0011] A boss is formed on the upper end surface of the motor housing and is embedded in the mounting groove. The mounting groove serves as a positioning reference for the installation of the main unit upper cover and the motor housing.

[0012] Preferably, the motor housing includes an upper end cover arranged on the stator assembly, the upper end cover extends outward to form the boss, the upper end cover has a first mounting cavity for accommodating a bearing, at least part of the first mounting cavity is arranged in the boss, the rotor shaft passes through the first mounting cavity, and the first mounting cavity serves as a positioning reference for the installation of the upper end cover and the rotor shaft.

[0013] Preferably, a bottom surface of the main unit upper cover extends toward the motor housing to form a peripheral edge, the peripheral edge is coaxially arranged with the rotor shaft, and the mounting groove is formed in the peripheral edge.

[0014] Preferably, the main engine upper cover further has a second installation cavity for installing a rotor shaft seal, and the second installation cavity is arranged above the installation groove and is interconnected.

[0015] Preferably, a distance H1 between the lower end surface of the first installation cavity and the upper end surface of the second installation cavity is 10-16 mm.

[0016] Preferably, the height of the boss is H2, the distance between the middle of the knife assembly and the upper surface of the main cover is H3, and H2:H3 is 0.2-1.

[0017] Preferably, the stator assembly includes an upper frame clamped outside the stator core, a first clamping portion is formed on the upper end surface of the upper frame, and a second clamping portion is formed on the inner side of the motor housing to be plugged into and cooperate with the first clamping portion; one of the first clamping portion and the second clamping portion is a slot, and the other is a protrusion, and at least part of the slot is closed along the circumferential direction.

[0018] Preferably, one of the upper end surface of the upper skeleton and the inner bottom surface of the upper end cover is provided with a thickened portion protruding axially outward, and the slot has a first notch formed by the inward depression of the thickened portion; and / or, the slot has a second notch formed by the inward depression of one of the upper end surface of the upper skeleton and the inner bottom surface of the upper end cover.

[0019] Preferably, the variable frequency driven juicer also includes a brushless motor drive board arranged horizontally in the main housing, and a battery electrically connected to the brushless motor drive board, the brushless motor drive board is electrically connected to the brushless motor, and the brushless motor, the brushless motor drive board and the battery are stacked in sequence from top to bottom in the main housing, and an avoidance space is formed between the brushless motor and the brushless motor drive board.

[0020] Preferably, the main body shell also includes a base arranged below the main body upper cover, and the variable frequency driven juicer also includes a barrier member arranged between the brushless motor drive board and the battery, the mounting portion of the main body upper cover passes through the barrier member and is plugged and fixed to the base, and the battery is pressed between the barrier member and the base.

[0021] The beneficial effects of the utility model are:

[0022] 1. The utility model provides a variable frequency driven juicer, which is installed in the mounting groove through a boss. The mounting groove is the positioning reference for the installation of the main cover and the motor housing. The motor housing is fixed to the bottom of the main cover, and the rotor shaft passes through the motor housing and the mounting groove in sequence and is connected to the knife assembly. Based on this, the brushless motor is directly installed on the main cover through the boss. In the process of assembling the motor housing, the central axis of the mounting groove is used as the reference line. There is no need to pass through the shaft sealing ring. Only one positioning is required to achieve the installation of the brushless motor on the main cover. Only one positioning reference is required, which greatly improves the installation accuracy between the motor and the main cover, and the positioning accuracy of the motor shaft is also greatly improved; secondly, when the knife is clamped, the radial limit of the mounting groove on the boss is reduced, which reduces the motor The impact friction between the shell and the host shell reduces noise; and the mounting groove serves as both a radial limiting component for the brushless motor and the only positioning reference when installing the motor shell and the host cover, which greatly simplifies the structure, optimizes the space utilization in the host shell, and is conducive to the flattening and portability of the host; furthermore, the brushless motor is installed between the host cover, and there is no need for other supporting parts to support the bottom surface of the brushless motor, thereby reducing the resonance between the brushless motor and other supporting parts, thereby reducing noise; in addition, the rotor shaft directly transmits power to the knife assembly without the need for multi-axis transmission, which further reduces the installation error between the rotor shaft and the knife assembly, and is more conducive to improving the coaxiality, thereby making the knife assembly work smoothly and cutting the material more evenly, which is conducive to improving the crushing rate.

[0023] 2. The main engine cover includes a first mounting cavity for accommodating bearings, at least a portion of which is located within the boss. The first mounting cavity serves as a positioning reference for the upper end cover and the rotor shaft. Because the first mounting cavity is formed within the boss, which in turn is embedded within the mounting groove, the first mounting cavity and the mounting groove partially overlap in axial height, significantly reducing the distance between the first mounting cavity and the main engine cover. This reduces the number of bearings required, and thus the number of support positions. This also allows for stable input of power from the rotor shaft to the blade assembly, significantly simplifying the structure. Furthermore, the reduced assembly between components significantly reduces positioning errors, thereby ensuring good coaxiality and avoiding the problem of increased resonance caused by over-positioning. This not only saves costs but also reduces noise.

[0024] 3. Because the boss height is H2, and the spacing between the middle of the blade assembly and the upper surface of the main unit cover is H3, with H2:H3 being 0.2-1, when H2:H3 is 0.2-1, the depth of the boss inserted into the positioning slot matches the installation angle of the blade assembly relative to the main unit cover. This reduces the rotor shaft and blade assembly from swinging, thereby improving power transmission accuracy and ensuring smoother blade operation. This reduces the risk of material getting stuck between the blade assembly and the main unit cover. When H2:H3 is greater than 1, the distance between the blade assembly and the main unit cover is too close, potentially forcing food toward the bottom of the blade assembly, potentially causing it to stick to the bottom or even get stuck. This also reduces the flow above the blade assembly and reduces the crushing effect. When H2:H3 is less than 0.2, the distance between the blade assembly and the main unit cover is too large, potentially causing the blade assembly to swing. Since the blade assembly is mounted on the rotor shaft, this swing can affect the stability of the brushless motor, resulting in significant overall machine swing.

[0025] 4. By horizontally installing the brushless motor drive board and battery in the host housing, the brushless motor, brushless motor drive board and battery are stacked in sequence from top to bottom, and an avoidance space is formed between the brushless motor and the brushless motor drive board. Based on the fact that the brushless motor drive board has a variety of components protruding from the board body and with different heights, these components extend into the avoidance space. The avoidance space is provided to allow these components to have storage space, avoid the brushless motor from being too close to the components, resulting in leakage of magnetic lines on the stator assembly, effectively avoiding electromagnetic interference, ensuring the correctness of the brushless motor drive board signal identification, and thus avoiding the situation of false triggering of components, thereby improving the safety of the whole machine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 The figure is a cross-sectional diagram of a variable frequency driven juicer in one embodiment of the present invention.

[0028] Figure 2 for Figure 1 The cross-sectional diagram of the main unit cover and brushless motor is shown.

[0029] Figure 3 for Figure 2 An enlarged schematic diagram of point A is shown.

[0030] Figure 4 for Figure 2 Schematic diagram of the structure of the upper end cover shown.

[0031] Figure 5 for Figure 4 An enlarged schematic diagram of point B is shown.

[0032] Figure 6 for Figure 2 Schematic cross-section of the brushless motor shown.

[0033] Figure 7 for Figure 2 Schematic diagram of the structure of the stator assembly shown.

[0034] Figure 8 for Figure 1 The structural diagram of the frequency conversion driven juicer is shown.

[0035] The names of the components in the figure are as follows:

[0036] 1. Main body housing; 11. Main body upper cover; 111. Mounting groove; 112. Surrounding edge; 113. Second mounting cavity; 12. Avoidance space; 13. Base; 2. Knife assembly; 3. Brushless motor; 31. Motor housing; 311. Boss; 312. Upper end cover; 3121. First mounting cavity; 313. Second clamping portion; 314. Thickening portion; 315. First notch; 316. Second notch; 32. Stator assembly; 321. Upper frame; 322. First clamping portion; 33. Rotor assembly; 331. Rotor shaft; 4. Brushless motor drive board; 5. Battery; 6. Barrier; 7. Rotor shaft seal. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See also Figures 1-8 An embodiment of the present invention provides a variable frequency driven juicer, comprising a main body housing 1, a blade assembly 2, a brushless motor 3, a brushless motor drive board 4, a battery 5 and a barrier 6.

[0039] The host housing 1 includes a host cover 11, wherein the host cover 11 is formed with a mounting groove 111;

[0040] The knife assembly 2 is located above the main body cover 11;

[0041] The brushless motor 3 includes a motor housing 31 mounted and fixed to the bottom of the main body cover 11, and a stator assembly 32 and a rotor assembly 33 disposed in the motor housing 31. The rotor assembly 33 has a rotor shaft 331 that sequentially passes through the motor housing 31 and the mounting slot 111 and is drivingly connected to the knife assembly 2.

[0042] A boss 311 is formed on the upper end surface of the motor housing 31 and is embedded in the mounting groove 111 . The mounting groove 111 serves as a positioning reference for the installation of the main body cover 11 and the motor housing 31 .

[0043] It should be noted that the brushless motor 3 can be offset from the center of the main housing 1, that is, the central axis of the brushless motor 3 and the central axis of the main housing 1 are spaced a certain distance apart. The brushless motor 3 can also be positioned without being offset from the center of the main housing 1; the boss 311 can be configured with a radial dimension smaller than the maximum outer diameter of the brushless motor 3. The boss 311 can be cylindrical.

[0044] It is understandable that, since the boss 311 is installed in the mounting groove 111, when the material is stuck between the main cover 11 and the knife assembly 2, the vibration is transmitted to the motor housing 31 through the mounting groove 111 of the main cover 11. The mounting groove 111 radially limits the boss 31, so that the brushless motor 3 does not produce radial displacement relative to the main cover 1, thereby reducing the impact friction between the motor housing 31 and the main cover 1, thereby reducing noise. The brushless motor 3 is directly installed on the main cover 11 through the boss 311. During the assembly of the motor housing 31, the central axis of the mounting groove 111 is used as the reference line. Without passing through the shaft sealing ring, only one positioning is required to achieve the installation of the brushless motor 3 on the main cover 1. Only one positioning reference is required, which greatly improves the installation accuracy between the motor and the main cover 11, and the positioning accuracy of the motor shaft is also greatly improved. The mounting groove 111 serves as both a radial limiting component for the brushless motor 3 and a unique positioning reference when installing the motor housing 31 and the host upper cover 11, which greatly simplifies the structure, optimizes the space utilization within the host housing 1, and facilitates the flattening and portability of the host.

[0045] The brushless motor 3 is mounted between the main unit cover 11, eliminating the need for other supports to support the bottom surface of the brushless motor 3. This reduces resonance between the brushless motor 3 and other supports, thereby reducing noise. Furthermore, the rotor shaft 331 transmits power directly to the blade assembly 2, eliminating the need for multi-axis transmission. This further reduces installation errors between the rotor shaft 331 and the blade assembly 2, further improving coaxiality. This, in turn, allows the blade assembly 2 to operate smoothly, cuts materials more evenly, and improves the crushing rate.

[0046] Furthermore, if Figure 2-Figure 3As shown, the motor housing 31 includes an upper end cover 312 covering the stator assembly 32, and the upper end cover 312 extends outward to form the boss 311. The upper end cover 312 has a first mounting cavity 3121 for accommodating a bearing, and at least a portion of the first mounting cavity 3121 is provided in the boss 311. The rotor shaft 331 passes through the first mounting cavity 3121. The first mounting cavity 3121 serves as a positioning reference for the installation of the upper end cover 312 and the rotor shaft 331.

[0047] It should be noted that the first installation cavity 3121 may be entirely formed in the boss 311 , or a portion of the first installation cavity 3121 may be formed in the boss 311 and the other portion may be formed in the upper end cover 312 .

[0048] It is understood that the first mounting cavity 3121 is formed within the boss 311, which is in turn embedded within the mounting groove 111. The first mounting cavity 3121 and the mounting groove 111 partially overlap in axial height, significantly reducing the distance between the first mounting cavity 3121 and the mainframe cover 11. This reduces the number of bearings required, and thus the number of support positions. This also ensures stable input of power from the rotor shaft 331 to the blade assembly 2, significantly simplifying the structure. Furthermore, the reduced assembly between components significantly reduces positioning errors, thereby ensuring good coaxiality and avoiding the problem of increased resonance caused by over-positioning. This not only saves costs but also reduces noise.

[0049] Specifically, the main engine cover 11 further has a second installation cavity 113 for installing the rotor shaft seal 7. The second installation cavity 113 is arranged above the installation groove 111 and is interconnected. Figure 2-Figure 3 As shown, the upper end of the second installation cavity 113 protrudes from the upper end surface of the main body cover 11 ; the upper end of the second installation cavity 113 can also be flush with the upper end surface of the main body cover 11 .

[0050] It is understood that the central axis of the first mounting cavity 3121, the central axis of the mounting slot 111, and the central axis of the second mounting cavity 113 are approximately or completely coincident, ensuring good coaxiality of the three, improving the transmission accuracy of the rotor shaft 331 transmitting power to the knife assembly 2, and making the knife assembly 2 less prone to deflection, greatly reducing the probability of knife jamming. Even when crushing large pieces of material, the knife assembly 2 is not likely to get stuck between the bottom of the knife assembly 2 and the main body housing 1, so that users do not need to cut the material into very small pieces, greatly improving the user experience. The rotor shaft seal 7 is provided to prevent moisture above the main body cover 11 from entering the main body housing 1, and to provide a good sealing effect on the main body housing 1.

[0051] As a preferred embodiment, Figure 3As shown, the distance H1 between the lower end surface of the first installation cavity 3121 and the upper end surface of the second installation cavity 113 is 10-16 mm. Preferably, H1 is 12.1 mm.

[0052] It is understood that when H1 is 10-16 mm, the spacing between the first mounting cavity 3121 and the main unit cover 11 is smaller, which reduces the number of bearings required while ensuring coaxiality. Only one bearing for the rotor shaft 331 is required between the first mounting cavity 3121 and the main unit cover 11 to ensure coaxiality. This reduces the number of support points and enables stable input of power from the rotor shaft 331 to the blade assembly 2, significantly simplifying the structure. Furthermore, the reduced assembly between components significantly reduces positioning errors and avoids the problem of increased resonance caused by over-positioning, saving costs and reducing noise.

[0053] When H1 is greater than 16 mm, the spacing between the first mounting cavity 3121 and the main unit cover 11 is too large, requiring an increased number of bearings to ensure coaxiality. This not only easily leads to over-positioning issues, but also complicates the structure and increases costs. When H1 is less than 10 mm, the spacing between the first mounting cavity 3121 and the main unit cover 11 is too small, and the height of the mounting groove 111 may also be set too small. The insertion depth of the boss 311 into the mounting groove 111 cannot be guaranteed, and the rotor shaft 331 and the blade assembly 2 are prone to swinging, which in turn affects the smooth operation of the blade assembly 2.

[0054] More specifically, to form the mounting groove 111, a rim 112 extends from the bottom surface of the main unit cover 11 toward the motor housing 31. This rim 112 is coaxial with the rotor shaft 331, and the mounting groove 111 is formed within this rim 112. It will be appreciated that a small gap exists between the rim 112 and the main unit cover 11 to prevent resonance between the main unit cover 11 and the rim 112, thereby reducing noise. The rim 112 protrudes from the bottom surface of the main unit cover 11, serving as a reinforcing rib to increase the structural strength of the main unit cover 11 and forming the mounting groove 111. The rim 112 wraps around the boss 311, increasing its stability within the mounting groove 111 and preventing any shaking.

[0055] In one embodiment, Figure 2 As shown, the height of the boss 311 is H2, the distance between the middle of the knife assembly 2 and the upper surface of the main cover 11 is H3, and H2:H3 is 0.2-1. Preferably, H2 is 3.5mm, H3 is 12mm, and H2:H3 is 0.3.

[0056] It is understandable that the middle of the knife assembly 2 refers to the geometric center of the knife assembly 2, and the axis of the rotor shaft 331 passes through this geometric center. Since some areas on the upper surface of the main machine upper cover 11 are concave inward and some areas are convex outward, H3 is the distance between the lowest point on the upper surface of the main machine upper cover 11 and the geometric center of the knife assembly 2. When H2:H3 is 0.2-1, the depth of the boss 311 inserted into the positioning groove is compatible with the installation coverage of the knife assembly 2 relative to the main machine upper cover 11, and the rotor shaft 331 and the knife assembly 2 are not prone to swinging, thereby improving the power transmission accuracy. The knife assembly 2 can run more smoothly, and the problem of material getting stuck between the knife assembly 2 and the main machine upper cover 11 is less likely to occur, especially when H3 is 12mm, it is not easy to get stuck even when cutting large pieces of material.

[0057] When H2:H3 is greater than 1, the distance between the blade assembly 2 and the main unit cover 11 is too close, which may push food toward the bottom of the blade assembly 2, causing it to stick to the bottom or even get stuck. This also hinders the flow of air from the upper side of the blade assembly 2, reducing the crushing effect. When H2:H3 is less than 0.2, the distance between the blade assembly 2 and the main unit cover 11 is too large, causing the blade assembly 2 to easily swing. Since the blade assembly 2 is mounted on the rotor shaft 331, this swinging of the blade assembly 2 will affect the stability of the brushless motor 3, causing the entire machine to swing significantly.

[0058] In one embodiment, Figure 4-Figure 7 As shown, the stator assembly 32 includes an upper frame 321 clamped outside the stator core, and a first clamping portion 322 is formed on the upper end surface of the upper frame 321. A second clamping portion 313 is formed on the inner side of the motor housing 31 to be plugged into and cooperate with the first clamping portion 322; one of the first clamping portion 322 and the second clamping portion 313 is a slot, and the other is a protrusion, and at least part of the slot is closed along the circumferential direction.

[0059] It should be noted that there can be multiple protrusions, and the number of slots and protrusions corresponds to each other. The motor housing 31 also has a lower end cover that is mounted and matched with the upper end cover 312. A lower frame is also provided below the upper frame 321. The upper frame 321 and the lower frame clamp the stator core up and down.

[0060] It can be understood that the frequency-variable driven juicer has a high-speed crushing function. When the brushless motor 3 starts working, even if the knife assembly 2 and the material produce a violent cutting collision, causing the main body housing 1 to shake, the shaking of the main body housing 1 will act on the upper end cover 312. However, since at least part of the card slot is circumferentially sealed, a fixed protrusion is inserted into the card slot. Whenever the protrusion has a tendency to move radially, the circumferentially sealed part of the card slot can give the protrusion a reverse force, which can firmly abut the protrusion and limit the radial displacement of the protrusion, thereby making it possible to stably install between the upper end cover 312 and the upper frame 321, and thus making the stator assembly 32 clamped by the upper frame 321 stable. It is avoided that the rotor assembly 33 interacting with the stator assembly 32 produces radial disturbance, that is, the rotor shaft 331 is also difficult to produce radial disturbance, thereby ensuring coaxiality, which not only reduces noise and improves safety performance, but also makes the knife assembly 2 connected to the rotor shaft 331 cut stably, cuts the material more evenly, greatly improves the crushing rate, and has a better taste. Secondly, the protrusions and the slots are plugged in and matched, so that the upper end cover 312 and the upper frame 321 can be easily assembled and disassembled, thereby facilitating assembly and disassembly without damaging parts.

[0061] Specifically, there are three ways to open a card slot, as follows:

[0062] In one embodiment, Figure 4-Figure 5 As shown, one of the upper end surface of the upper skeleton 321 and the inner bottom surface of the upper end cover 312 is provided with a thickened portion 314 protruding axially outward, and the slot has a first notch 315 formed by the inward depression of the thickened portion 314; the slot also has a second notch 316 formed by the inward depression of the upper end surface of the upper skeleton 321 and the inner bottom surface of the upper end cover 312.

[0063] Specifically, the first engaging portion 322 is the protrusion, and the second engaging portion 313 is the engaging groove. The upper end cover 312 has a thickened portion 314 extending outwardly in the axial direction. The engaging groove has a first notch 315 formed by an inward depression of the thickened portion 314, and a second notch 316 formed by an inward depression on the inner end surface of the upper end cover 312. The first notch 315 is connected to the second notch 316. One side of the first notch 315 is connected to the outside. The second notch 316 is circumferentially closed.

[0064] The first notch 315 is open, with an opening in the circumferential direction; the second notch 316 is closed along the circumferential direction. Part of the side surface of the first notch 315 forms the inner wall of the upper end cover 312, and the same applies to the second notch 316. The slot is formed by two overlapping notches, which can increase the slot depth, thereby increasing the insertion depth of the protrusion within the slot and increasing the contact area between the protrusion and the slot. When the entire machine is in operation and torsional rotation occurs along the circumferential direction, the anti-torsion strength of the protrusion is increased, making the protrusion less likely to break, thereby ensuring the reliable fit between the upper end cover 312 and the upper frame 321.

[0065] In one embodiment, not shown in the figure, the arrangement of the card slot can also be: one of the upper end surface of the upper skeleton 321 and the inner bottom surface of the upper end cover 312 is provided with a thickened portion 314 protruding axially outward, and the card slot has a first notch 315 formed by the inward depression of the thickened portion 314.

[0066] In one embodiment, not shown in the figure, the arrangement of the card slot can also be: the card slot has a second notch 316 formed by an inward depression of one of the upper end surface of the upper frame 321 and the inner bottom surface of the upper end cover 312.

[0067] In one embodiment, Figure 1 、 Figure 8 As shown, the variable frequency driven juicer also includes a brushless motor drive board 4 arranged horizontally in the main body shell 1, and a battery 5 electrically connected to the brushless motor drive board 4, the brushless motor drive board 4 is electrically connected to the brushless motor 3, and the brushless motor 3, the brushless motor drive board 4 and the battery 5 are stacked in sequence from top to bottom in the main body shell 1, and an avoidance space 12 is formed between the brushless motor 3 and the brushless motor drive board 4.

[0068] It is understandable that the brushless motor drive board 4 has a variety of components protruding from the board body and of different heights, especially the capacitors provided on the brushless motor drive board 4 are the highest, and these components extend into the avoidance space 12. The avoidance space 12 is provided to allow these components to have storage space to prevent the brushless motor 3 from being too close to the components, causing the magnetic lines of force on the stator assembly 32 to leak out, generating electromagnetic interference, affecting the signal recognition of the brushless motor drive board 4, and then causing the components to be mistriggered. There may be a series of safety issues caused by the misdriving of the brushless motor 3. Secondly, the brushless motor 3, the brushless motor drive board 4 and the battery 5 are stacked in sequence from top to bottom, which can reduce the lateral size of the host housing 1 and is conducive to the flattening of the host.

[0069] Specifically, in order to install the battery 5, the main body shell 1 also includes a base 13 provided under the main body cover 11, and the variable frequency driven juicer also includes a barrier 6 provided between the brushless motor drive board 4 and the battery 5. The mounting portion of the main body cover 11 passes through the barrier 6 and is plugged and fixed to the base 13, and the battery 5 is pressed between the barrier 6 and the base 13.

[0070] It is understandable that by pressing the battery 5 between the barrier 6 and the base 13, the battery 5 can be installed and fixed without bolts. The mounting portion of the host cover 11 passes through the barrier 6 and is plugged and fixed to the base 13. The host cover 11, the barrier 6, and the base 13 can be fixed together at once, making the installation operation simple. Secondly, the battery 5 generates a lot of heat, and the barrier 6 can also act as a heat insulator between the battery 5 and the brushless motor drive board 4, preventing safety hazards and improving the stability of the brushless motor drive board 4.

[0071] In addition to the preferred embodiments described above, the technical solutions protected by this utility model are not limited to the aforementioned 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 this utility model. Although the utility model 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 to the utility model based on the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by this utility model.

Claims

1. A variable frequency driven juicer, characterized in that: include: The host housing comprises a host upper cover, wherein the host upper cover is formed with a mounting groove; A knife assembly is located above the upper cover of the main machine; The brushless motor comprises a motor housing fixed to the bottom of the main body upper cover, and a stator assembly and a rotor assembly disposed in the motor housing. The rotor assembly has a rotor shaft that sequentially passes through the motor housing and the mounting slot and is transmission-connected to the knife assembly. A boss is formed on the upper end surface of the motor housing and is embedded in the mounting groove. The mounting groove serves as a positioning reference for the installation of the main unit upper cover and the motor housing.

2. The variable frequency driven juicer according to claim 1, characterized in that: The motor housing includes an upper end cover that is covered on the stator assembly. The upper end cover extends outward to form the boss. A first mounting cavity for accommodating a bearing is provided in the upper end cover. At least a portion of the first mounting cavity is provided in the boss. The rotor shaft passes through the first mounting cavity. The first mounting cavity serves as a positioning reference for the installation of the upper end cover and the rotor shaft.

3. The variable frequency driven juicer according to claim 1 or 2, characterized in that: The bottom surface of the main body upper cover extends toward the motor housing to form a peripheral edge, the peripheral edge is coaxially arranged with the rotor shaft, and the mounting groove is formed in the peripheral edge.

4. The variable frequency driven juicer according to claim 2, characterized in that: The main engine upper cover also has a second installation cavity for installing a rotor shaft seal, and the second installation cavity is arranged above the installation groove and is interconnected.

5. The variable frequency driven juicer according to claim 4, characterized in that: A distance H1 between the lower end surface of the first installation cavity and the upper end surface of the second installation cavity is 10-16 mm.

6. The variable frequency driven juicer according to claim 1, characterized in that: The height of the boss is H2, the distance between the middle of the knife assembly and the upper surface of the main body cover is H3, and H2:H3 is 0.2-1.

7. The variable frequency driven juicer according to claim 1, characterized in that: The stator assembly includes an upper frame clamped outside the stator core, a first clamping portion is formed on the upper end surface of the upper frame, and a second clamping portion is formed on the inner side of the motor housing and is plugged into and engaged with the first clamping portion; one of the first clamping portion and the second clamping portion is a slot, and the other is a protrusion, and at least part of the slot is closed along the circumferential direction.

8. The variable frequency driven juicer according to claim 7, characterized in that: One of the upper end surface of the upper skeleton and the inner bottom surface of the upper end cover is provided with a thickened portion protruding axially outward, and the slot has a first notch formed by the inward depression of the thickened portion; and / or, the slot has a second notch formed by the inward depression of one of the upper end surface of the upper skeleton and the inner bottom surface of the upper end cover.

9. The variable frequency driven juicer according to claim 1, characterized in that: The variable frequency driven juicer also includes a brushless motor drive board arranged horizontally in the main body shell, and a battery electrically connected to the brushless motor drive board. The brushless motor drive board is electrically connected to the brushless motor. The brushless motor, the brushless motor drive board and the battery are stacked in sequence from top to bottom in the main body shell, and an avoidance space is formed between the brushless motor and the brushless motor drive board.

10. The variable frequency driven juicer according to claim 9, characterized in that: The main body shell also includes a base arranged below the main body cover, and the variable frequency driven juicer also includes a barrier member arranged between the brushless motor drive board and the battery. The mounting portion of the main body cover passes through the barrier member and is plugged and fixed to the base, and the battery is pressed between the barrier member and the base.

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