Portable food processor

Abstract

The utility model relates to a portable food processing machine, which comprises a main machine shell with a closed sealing cavity; the brushless motor comprises a motor shell installed in the sealing cavity, a stator assembly installed in an inner cavity of the motor shell and a rotor assembly arranged in the stator assembly, a groove hole communicated with the inner cavity is formed in the motor shell in a penetrating mode, and the motor shell comprises a lower end cover at least partially surrounding the stator assembly and the rotor assembly; the brushless motor driving plate is arranged in the sealing cavity and located below the lower end cover, and the brushless motor driving plate is electrically connected with the brushless motor; and an isolation gap is formed between the brushless motor driving plate and the lower end cover. According to the technical scheme of the utility model, the electromagnetic interference to the components is effectively avoided, the signal discrimination accuracy of the components is ensured, the false triggering condition is effectively avoided, and the safety of the portable food processor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of food processors, in particular to a portable food processor with good safety performance. Background Art

[0002] At present, food processors have been more and more widely used. They mainly cut and crush food through processing knives arranged at the bottom of the processing cavity of the food processor, so as to make the food reach the required degree of crushing and meet the eating needs of users.

[0003] The application number is CN202021171400.6, and the invention name is "a motor assembly of a food processor and a food processor with an ultra-thin main body", which discloses that the motor body, the control board assembly and the battery assembly are stacked. The motor housing includes a bowl-shaped structure with an open end and a motor cover covering the opening of the bowl-shaped structure, and the control board assembly is fixed on the motor cover; or, the control board assembly fits the axial end of the motor body, and the control board assembly and the motor housing form a motor installation cavity, that is, the control board assembly directly serves as the bottom shell of the motor housing. However, the technical problems existing in this technical solution are as follows: whether the control board assembly serves as the bottom shell of the motor housing or the control board assembly is fixed on the motor cover, the distance between the control board assembly and the motor stator and the motor rotor is too close. There are components on the control board assembly that are higher than the board body and have different heights, and these components are too close to the motor stator and the motor rotor. It is difficult to install these components in the flat space of the motor installation cavity; secondly, the magnetic field generated by the motor stator and rotor will generate electromagnetic interference on the components, thus affecting the signal discrimination of the control board assembly. For example, the control module for driving the motor on the control board assembly is mis-triggered, resulting in the motor being mis-started. At this time, the processing cavity may not be installed properly, bringing great potential safety hazards.

[0004] The application number is CN201921853579.0, and the invention name is "novel DC motor", which discloses that the front end cover is used for support and protection, and the circuit board covers the lower opening of the front end cover, replacing the rear end cover. However, the technical problems existing in this technical solution are as follows: the circuit board replaces the rear end cover, resulting in the distance between the circuit board and the motor stator and the motor rotor being too close. There are components on the circuit board that are higher than the board body and have different heights, and these components are too close to the stator and the rotor. It is difficult to install these components in the flat space of the motor installation cavity; secondly, the magnetic field generated by the stator and rotor will generate electromagnetic interference on the components, thus affecting the signal discrimination of the circuit board, and there is a situation of mis-triggering, bringing great potential safety hazards.

[0005] The above - disclosed technical solutions all have the following technical problems: The circuit board is too close to the stator and the rotor, making it difficult to install components on the circuit board. Moreover, the stator and rotor on the motor cause electromagnetic interference to the circuit board, which can affect the signal discrimination of the circuit board and lead to mis - triggering, posing a great potential safety hazard. Summary of the Invention

[0006] The purpose of the present utility model is to provide a portable food processor to solve the technical problems that the installation space for components on the circuit board is limited, and the motor may affect the accuracy of signal discrimination of the circuit board, resulting in mis - triggering.

[0007] To solve the above - mentioned technical problems, the present utility model provides a portable food processor, comprising:

[0008] A main body housing having a closed sealed cavity;

[0009] A brushless motor, including a motor housing installed in the sealed cavity, a stator assembly installed in the inner cavity of the motor housing, and a rotor assembly disposed within the stator assembly. A slot hole communicating with the inner cavity is formed through the motor housing, and the motor housing includes a lower end cover that at least partially surrounds the stator assembly and the rotor assembly;

[0010] A brushless motor drive board is installed in the sealed cavity and is located below the lower end cover, and the brushless motor drive board is electrically connected to the brushless motor; wherein, there is an isolation gap between the brushless motor drive board and the lower end cover.

[0011] Preferably, the projection of the slot hole on the horizontal plane is located within the isolation gap.

[0012] Preferably, the brushless motor drive board includes a board body installed in the sealed cavity and a capacitor disposed on the board body. The capacitor protrudes from the upper surface of the board body and extends into the isolation gap.

[0013] Preferably, the brushless motor drive board includes a MOS transistor for starting and stopping the brushless motor, and the projection of at least part of the slot hole on the horizontal plane coincides with the MOS transistor.

[0014] Preferably, the inner cavity has an installation space surrounding the outer periphery of the rotor assembly, the stator assembly is disposed in the installation space, and the projection of part of the installation space on the horizontal plane coincides with the slot hole.

[0015] Preferably, the height of the sealed cavity is H1, the height of the isolation gap is H2, and H1:H2 is 4 - 15.

[0016] Preferably, the portable food processor further includes a battery electrically connected to the brushless motor driving board. The brushless motor, the brushless motor driving board, and the battery are stacked axially in sequence. The portable food processor further includes a barrier member disposed between the brushless motor driving board and the battery, and the barrier member is fixedly installed with the main body housing.

[0017] Preferably, the barrier member includes a barrier member body locked to the brushless motor driving board, and a side portion disposed at the edge of the barrier member body and located outside the periphery of the isolation gap. The battery is press-fitted between the barrier member body and the bottom of the main body housing, and the side portion is fixedly connected to the main body housing.

[0018] Preferably, the isolation gap is disposed between the brushless motor driving board and the lower end cover. A wiring terminal electrically connected to the battery is provided on the edge of the brushless motor driving board, and the wiring terminal is located radially outside the isolation gap.

[0019] Preferably, the upper end surface of the wiring terminal is higher than the upper end surface of the brushless motor driving board, and the height of the wiring terminal overlaps at least partially with the height of the isolation gap.

[0020] The beneficial effects of the present utility model are as follows:

[0021] 1. For a portable food processor provided by the present utility model, a slot hole communicating with the inner cavity is formed through the motor housing. The motor housing includes a lower end cover that at least partially surrounds the stator assembly and the rotor assembly. The brushless motor driving board is located below the lower end cover. Based on this, since there are components with different heights on the brushless motor driving board, and these components require installation space, an isolation space is provided below the lower end cover of the brushless motor, so that there is space for installing components between the brushless motor and the brushless motor driving board. Secondly, by setting an isolation space between the lower end cover and the brushless motor driving board, there is a certain safety distance between the components on the brushless motor driving board and the stator assembly and the rotor assembly, effectively avoiding electromagnetic interference of the magnetic field generated by the stator assembly and the rotor assembly on the components, thereby ensuring the accuracy of signal discrimination of the components on the brushless motor driving board and effectively avoiding the occurrence of mis-triggering, greatly improving the safety of the portable food processor. Furthermore, the slot hole uses the rotation of the rotor assembly to drive the air flow around it, thereby realizing the dissipation of the heat in the brushless motor from the slot hole. Therefore, the inner cavity, the slot hole, the sealing cavity, and the isolation gap form a longitudinal heat dissipation self-circulation. Due to the existence of the isolation gap, the longitudinal heat dissipation is not blocked, allowing the heat in the sealing cavity to be quickly digested independently. This not only realizes the digestion of the heat generated inside the brushless motor but also helps to extend the service life of other components in the main body housing.

[0022] 2. Insert the capacitor on the board body into the isolation gap. Among the components arranged on the brushless motor drive board, the axial height of the capacitor is the highest within the range of the board body. The axial height of the isolation gap meets the height setting requirements of the capacitor, and thus also meets the height setting requirements of other components on the board body. The height of the isolation gap is sufficient to meet the height setting requirements of components with different heights on the board body.

[0023] 3. Make the projection of at least part of the slot holes on the horizontal plane coincide with the MOS transistor. Utilize the rotation of the rotor assembly to drive the airflow movement around it, thereby realizing the dissipation of the heat inside the brushless motor from these slot holes. When the heat dissipates from the slot holes, the airflow is directly above the MOS transistor, causing the airflow above the MOS transistor to move, and then taking away the heat generated near the MOS transistor. The slot holes not only achieve the heat dissipation inside the brushless motor but also simultaneously dissipate heat from the MOS transistor through the airflow movement. One hole has multiple functions, reducing the setting of other heat dissipation components, simplifying the structure, and greatly improving the heat dissipation efficiency. It effectively avoids excessive local temperature rise inside the main housing. Since more heat is generated on the MOS transistor of the brushless motor drive board, dissipating heat from the MOS transistor also realizes the heat dissipation of the brushless motor drive board, preventing its temperature from rising too quickly.

[0024] 4. Stack the brushless motor, the brushless motor drive board, and the battery axially in sequence, and set a barrier between the brushless motor drive board and the battery. Based on this, since the brushless motor generates more heat, by setting the battery at the bottom of the sealed cavity, keeping the battery away from the brushless motor, that is, keeping the battery away from the heat source, preventing potential safety hazards caused by excessive battery temperature; secondly, since the brushless motor drive board also generates a certain amount of heat, which will affect the temperature rise of the battery. By setting a barrier between the battery and the brushless motor drive board to separate them, it plays a role in heat insulation protection for the battery, preventing the local temperature rise inside the main unit from being too fast and dispersing the heat as much as possible; based on the barrier including a barrier body and a side part provided at the edge of the barrier body, press-fit the battery between the barrier body and the bottom of the main housing, and the side part is fixedly connected to the main housing, thus realizing the fixed connection between the barrier body and the main housing. After the barrier body and the bottom of the main housing are installed, there is a gap, which is used to accommodate the battery. The height of this gap just enables the battery to be press-fitted between the barrier body and the base, and the battery can be fixedly installed without setting any screws, realizing screw-free installation of the battery, greatly simplifying the structure, and having higher installation efficiency. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 This is a schematic structural diagram of a brushless motor of a portable food processor in one embodiment of the present utility model.

[0027] Figure 2 This is a schematic structural diagram of a stator assembly in the brushless motor.

[0028] Figure 3 It is Figure 1 a schematic structural diagram of the lower end cover shown.

[0029] Figure 4 It is Figure 1 a schematic cross-sectional view of the brushless motor shown.

[0030] Figure 5 This is a schematic structural diagram of a portable food processor in one embodiment of the present utility model.

[0031] Figure 6 It is Figure 5 a schematic structural diagram of the barrier member and the brushless motor drive board shown.

[0032] Figure 7 It is Figure 5 a schematic cross-sectional view of the portable food processor shown.

[0033] Figure 8 It is Figure 1 a schematic structural diagram of the upper end cover shown.

[0034] The names of the various components marked in the figure are as follows:

[0035] 1. Main body housing; 11. Sealing cavity; 12. Isolation gap; 13. Upper cover of the main body; 131. Second mounting post; 14. Base; 141. Third mounting post; 2. Brushless motor; 21. Motor housing; 22. Stator assembly; 221. Stator bracket; 223. Stator core; 2231. Tooth part; 2232. Yoke part; 23. Rotor assembly; 233. Rotor shaft; 24. Upper end cover; 241. Upper end plate; 242. Mounting part; 25. Lower end cover; 251. Lower end plate; 2511. Spacing part; 2512. Slot hole; 27. Inner cavity; 3. Brushless motor drive board; 31. Board body; 32. MOS tube; 33. Wiring terminal; 34. Extension part; 4. Battery; 5. Barrier member; 51. Barrier member body; 52. Side part; 521. First mounting post. Detailed implementation manners

[0036] The following will further elaborate on the present utility model in detail in conjunction with the accompanying drawings and specific embodiments.

[0037] Please refer to Figures 1-4, A brushless motor of a portable food processor, the brushless motor 2 includes a motor housing 21, a stator assembly 22 and a rotor assembly 23. The stator assembly 22 includes a stator core 223, a stator bracket 221 and a stator winding. The rotor assembly 23 includes a rotor core, a permanent magnet and a rotor shaft 233. The motor housing 21 includes an upper end cover 24 and a lower end cover 25, the upper end cover 24 includes an upper end plate 241, and the lower end cover 25 includes a lower end plate 251.

[0038] The lower end cover 25 is vertically installed and fitted with the upper end cover 24, and an inner cavity 27 is formed by surrounding with the upper end cover 24; the stator assembly 22 is installed in the inner cavity 27, including a stator bracket 221 and a stator winding wound on the stator bracket 221; the rotor assembly 23 is arranged in the stator assembly 22, including a rotor core, a permanent magnet embedded in the rotor core, and a rotor shaft 233 fixedly arranged through the rotor core, and both sides of the rotor shaft 233 pass through the upper end cover 24 and the lower end cover 25 respectively; wherein, the upper end cover 24 includes an upper end plate 241 arranged at the top of the inner cavity 27, and the lower end cover 25 includes a lower end plate 251 arranged at the bottom of the inner cavity 27; one of the upper end plate 241 and the lower end plate 251 is formed with a plurality of slot holes 2512, and the slot holes 2512 are non-centrally symmetrically distributed relative to the axis of the rotor.

[0039] It should be noted that the slot holes 2512 can be formed on the upper end plate 241 or on the lower end plate 251. There are two or more slot holes 2512. The axis of the rotor refers to the geometric center of the rotor, and the axis of the rotor is on the central axis of the rotor shaft 233, and the rotor rotates around this axis. The non-central symmetric distribution of the slot holes 2512 relative to the axis of the rotor means that each slot hole 2512 does not coincide with the slot hole 2512 after rotating 180° around the axis of the rotor, that is, there is no slot hole 2512 at the central symmetry position of each slot hole 2512 relative to the center of the rotor shaft 233, and the cross-section of the stator assembly 22 is in a circular ring shape.

[0040] It can be understood that the rotation of the rotor assembly 23 drives the airflow around it, thereby realizing the dissipation of the heat in the brushless motor 2 from the slot 2512. The slot 2512 can be used for dissipating heat in the brushless motor 2. Since each pair of S poles and N poles on the stator assembly 22 is centrosymmetric with respect to the axis of the rotor, the magnetic lines of force form a closed curve when there is no component blocking between a pair of S poles and N poles. Once the magnetic lines of force form a closed curve, it may generate electromagnetic interference to other components around the brushless motor 2. Based on this principle, when a part of the magnetic lines of force penetrates from a slot 2512, since the slot 2512 is non-centrosymmetrically distributed with respect to the axis of the rotor, that is, there is no slot 2512 at the centrosymmetric position of each slot 2512 with respect to the axis of the rotor shaft 233, that is, the opposite side of each slot 2512 with respect to the axis of the rotor shaft 233 is a closed end plate. The part of the magnetic lines of force penetrating from the slot 2512 cannot form a closed curve, so it cannot generate a magnetic field, and further cannot generate electromagnetic interference to other components outside the brushless motor 2, thereby effectively ensuring the normal operation of the portable food processor and greatly improving the safety performance. Therefore, the slot 2512 not only meets the heat dissipation requirements of the inner cavity 27 of the brushless motor 2, but also meets the requirements of the overall safety performance of the machine.

[0041] Secondly, if magnetic lines of force penetrate from the slot 2512 near the N pole in a pair of N poles and S poles, a very small number of the magnetic lines of force may turn along the side of the brushless motor 2 and form a closed curve with the corresponding S pole, that is, form a closed curve along the longitudinal direction of a pair of N poles and S poles. Based on this principle, the slot 2512 is provided only on one of the upper end plate 241 and the lower end plate 251. If the slot 2512 is provided on the lower end plate 251, no slot 2512 will be provided on the upper end plate 241, and the upper end plate 241 will be set as a closed end plate, and vice versa, in order to avoid that a very small number of the magnetic lines of force penetrating from the slot 2512 form a closed loop longitudinally, thereby generating magnetic field interference to other components outside the brushless motor 2.

[0042] Specifically, such as Figure 3As shown, one of the upper end plate 241 and the lower end plate 251 includes a spacer portion 2511 provided between two adjacent slot holes 2512. The spacer portion 2511 is a closed plate body 31. The spacer portion 2511 circumferentially spaces the slot holes 2512. One side of the line connecting the geometric center of the slot hole 2512 and the center of the rotor shaft 233 is provided with the slot hole 2512, and the other side is provided with the spacer portion 2511, that is, the opposite side of the slot hole 2512 relative to the center of the rotor shaft 233 is the closed spacer portion 2511, so that there is no slot hole 2512 at the center symmetry of each slot hole 2512 relative to the center of the rotor shaft 233. Thus, the magnetic lines of force penetrating from the slot holes 2512 cannot form a closed curve, and thus cannot generate a magnetic field, and further cannot generate electromagnetic interference to other components outside the brushless motor 2, thereby effectively ensuring the normal operation of the portable food processor and greatly improving the safety performance.

[0043] More specifically, on the same circumference, the arc length of the spacer portion 2511 in the circumferential direction is greater than the maximum arc length of the slot hole 2512 in the circumferential direction. The spacer portion 2511 is used to circumferentially space the slot holes 2512, further ensuring that there is no slot hole 2512 at the opposite side of each slot hole 2512 relative to the center of the rotor shaft 233. It is a completely closed end plate, avoiding a part of another slot hole 2512 being exposed at the opposite side of the slot hole 2512 relative to the center of the rotor shaft 233. Thus, it effectively ensures that the magnetic lines of force penetrating from each slot hole 2512 cannot form a closed curve, and more effectively avoids electromagnetic interference.

[0044] It should be noted that the slot holes 2512 can be set to be arc-shaped strips in the circumferential direction, and can be set to be rectangular, square or various other special shapes, etc. It can be understood that in this embodiment, the slot holes 2512 are provided on the lower end plate 251, and the slot holes 2512 are set to be arc-shaped strips in the circumferential direction. The slot holes 2512 have a maximum arc length and a minimum arc length in the circumferential direction. The maximum arc length of the slot holes 2512 is located on the side away from the axis of the rotor, and the minimum arc length of the slot holes 2512 is located on the side close to the axis of the rotor.

[0045] In one embodiment, as Figure 4 shown, the inner cavity 27 has an installation space surrounding the outer circumference of the rotor assembly 23. The stator assembly 22 is arranged in the installation space. The projection of part of the installation space on the horizontal plane coincides with the slot holes 2512. A plurality of slot holes 2512 are spaced apart at the projection of the installation space. In this embodiment, three slot holes 2512 are provided.

[0046] It can be understood that the stator assembly 22 generates more heat than the rotor assembly 23. Aligning the slot 2512 with the installation space such that the slot 2512 is closest to the stator assembly 22 shortens the heat dissipation path of the stator assembly 22. The slot 2512 can quickly discharge the heat from the stator assembly 22, improving the heat dissipation efficiency inside the brushless motor 2.

[0047] Further, to achieve rapid heat dissipation of the stator assembly 22, the stator assembly 22 further includes a stator core 223. The stator bracket 221 is clamped outside the stator core 223. The stator core 223 includes multiple pairs of tooth portions 2231 arranged oppositely, and a yoke portion 2232 connecting the tooth portions 2231. The stator winding is disposed outside the tooth portions 2231. The projection of one of each pair of tooth portions 2231 on the horizontal plane coincides with the slot 2512. Of course, in other embodiments, the slot 2512 can also be aligned with the gap between two adjacent tooth portions 2231.

[0048] It can be understood that the part of the stator assembly 22 that generates the most heat is the stator winding. The stator winding is wound outside the tooth portions 2231. Aligning the slot 2512 with the tooth portions 2231, that is, aligning with the stator winding, makes the slot 2512 closest to the stator winding, shortening the heat dissipation path of the stator assembly 22. The slot 2512 quickly discharges the heat from the stator winding to the outside of the brushless motor 2. In this embodiment, there are three pairs of tooth portions 2231. Correspondingly, there are three pairs of S poles and N poles. Each pair of tooth portions 2231 and the stator winding wound thereon corresponds to a pair of S poles and N poles. Only one of the tooth portions 2231 in a pair of tooth portions 2231 is aligned with the slot 2512, and the other tooth portion 2231 in a pair of tooth portions 2231 is aligned with the closed end plate. Only one of a pair of S poles and N poles is cooled, so that the magnetic lines of force penetrating out of the slot 2512 cannot form a closed curve, and thus no magnetic field can be generated, effectively shielding electromagnetic interference to other peripheral components. Therefore, both rapid heat dissipation of the stator assembly 22 with the shortest path is achieved, and electromagnetic interference can be effectively avoided at the same time.

[0049] Specifically, as Figure 4 shown, the axial distance between the stator winding and the slot 2512 is 1 - 3 mm, and preferably this axial distance is 1.7 mm.

[0050] It should be noted that in this embodiment, the slot 2512 is provided on the lower end plate 251. The vertical distance between the lowermost end of the stator winding and the slot 2512 is the axial distance between the stator winding and the slot 2512, and there is a small gap within the axial distance.

[0051] It is understandable that when the axial spacing between the stator winding and the slot 2512 is 1-3mm, the brushless motor 2 is kept small, more magnetic lines of force can form a closed curve in the inner cavity 27, and the magnetic lines of force can be minimized from leaking out of the slot 2512. On the one hand, the loss of magnetic lines of force is reduced, and on the other hand, it is also beneficial to reduce electromagnetic interference. When the axial spacing between the stator winding and the slot 2512 is greater than 3mm, the axial spacing is too large, resulting in an increase in the volume of the brushless motor 2, thereby increasing the volume of the host, which is not conducive to portability. When the axial spacing between the stator winding and the slot 2512 is less than 1mm, more magnetic lines of force are likely to leak out of the slot 2512, increasing the loss of magnetic lines of force.

[0052] like Figure 1 As shown, the height of the upper end cover 24 is smaller than the height inside the lower end cover 25, the slot 2512 is arranged on the lower end plate 251, the volume of the upper end cover 24 is smaller than the volume of the lower end cover 25, and the slot 2512 is arranged on the lower end cover 25 with a larger volume. While satisfying the heat dissipation of the slot 2512, the structural strength of the motor housing 21 can also be guaranteed.

[0053] like Figure 3 As shown, the projection area of ​​the slot 2512 on the horizontal plane is S1, the projection area of ​​the lower end plate 251 on the horizontal plane is S2, and S1:S2 is 0.05-0.25. Preferably, S1:S2 is 0.09, and S1 is 130.2 mm 2 , S2 is 1444.5mm 2 .

[0054] It can be understood that there are three slots 2512 on the lower end plate 251, S1 is the sum of the areas of the three slots 2512; the lower end plate 251 has a through hole passing through the rotor shaft 233, and S2 is the projected area of ​​the entire lower end plate 251 minus the through hole. When S1:S2 is 0.05-0.25, the area of ​​the slot 2512 is sufficient to meet the heat dissipation requirements of the stator winding, allowing the stator winding to dissipate heat quickly, while also ensuring the structural strength of the lower end plate 251. When S1:S2 is less than 0.05, the area of ​​the slot 2512 is too small, resulting in a too slow speed of extracting the heat generated on the stator winding, making it difficult to meet the heat dissipation requirements of the stator winding, causing the temperature of the inner cavity 27 to rise too quickly, affecting the service life of the stator assembly 22 and the rotor assembly 23. When S1:S2 is greater than 0.25, the area of ​​the slot 2512 is too large, greatly reducing the structural strength of the lower end plate 251.

[0055] See also Figures 5-8, an embodiment of the present utility model further provides a portable food processor, including a brushless motor of the portable food processor and a main body housing 1. The brushless motor 2 is hoisted inside the main body housing 1 to install the miniaturized brushless motor 2 inside the main body housing 1, so as to drive the portable food processor by the brushless motor 2. For the brushless motor of the portable food processor, please continue to refer to Figures 1-4 . A portable food processor further includes a brushless motor drive board 3, a battery 4, and a barrier member 5.

[0056] As Figure 5 , Figure 7 shown, the main body housing 1 has a closed sealed cavity 11; the brushless motor 2 includes a motor housing 21 installed inside the sealed cavity 11, a stator assembly 22 is installed inside the inner cavity 27 of the motor housing 21, and a slot hole 2512 communicating with the inner cavity 27 is formed through the motor housing 21. The lower end cover 25 at least partially surrounds the stator assembly 22 and the rotor assembly 23; the brushless motor drive board 3 is installed inside the sealed cavity 11 and is located below the lower end cover 25. The brushless motor drive board 3 is electrically connected to the brushless motor 2; wherein, there is an isolation gap 12 between the brushless motor drive board 3 and the lower end cover 25.

[0057] It should be noted that the brushless motor drive board 3 can be arranged below the brushless motor 2. The slot hole 2512 can be used for heat dissipation inside the brushless motor 2. The slot hole 2512 can be only arranged on the upper end or the lower end of the motor housing 21. The portable food processor can be a miniaturized food processor such as a juicer. The lower end cover 25 can partially surround the stator assembly 22 and the rotor assembly 23, or the lower end cover 25 can entirely surround the stator assembly 22 and the rotor assembly 23. The brushless motor drive board 3 controls the start and stop of the brushless motor 2, and controls the battery 4 to supply power or cut off power to the brushless motor 2.

[0058] It can be understood that since there are components with different heights on the brushless motor drive board 3 and these components require installation space, an isolation space will be provided below the lower end cover 25 of the brushless motor 2, so that there is space for installing components between the brushless motor 2 and the brushless motor drive board 3; secondly, an isolation space is set between the lower end cover 25 and the brushless motor drive board 3 to make there be a certain safety distance between the components on the brushless motor drive board 3 and the stator assembly 22 and the rotor assembly 23, effectively avoiding electromagnetic interference on the components caused by the magnetic field generated by the stator assembly 22 and the rotor assembly 23, thereby ensuring the signal discrimination accuracy of the components on the brushless motor drive board 3 and effectively avoiding the occurrence of mis-triggering, greatly improving the safety of the portable food processor. When the battery 4 is also below the lower end cover 25, setting the isolation space can also prevent the battery 4 from being affected by the electromagnetic interference brought by the stator assembly 22 and the rotor assembly 23.

[0059] The brushless motor drive board 3 is electrically connected to the battery 4. Of course, in other embodiments, the battery 4 and the brushless motor drive board 3 can also be arranged side by side below the brushless motor 2. There is an isolation gap 12 between both the battery 4 and the brushless motor drive board 3 and the lower end cover 25.

[0060] Furthermore, the slot hole 2512 drives the airflow around it by the rotation of the rotor assembly 23, thereby realizing the dissipation of the heat inside the brushless motor 2 from the slot hole 2512. Therefore, the inner cavity 27, the slot hole 2512, the sealing cavity 11, and the isolation gap 12 form a longitudinal heat dissipation self-circulation. Due to the existence of the isolation gap 12, the heat dissipation in the longitudinal direction is not blocked, enabling the heat in the sealing cavity 11 to be quickly digested independently. This not only realizes the digestion of the heat generated inside the brushless motor 2 but also helps to extend the service life of other components inside the main machine housing 1.

[0061] Specifically, the brushless motor drive board 3 includes a board body 31 disposed in the sealing cavity 11 and a capacitor provided on the board body 31. The capacitor is electrically connected to the battery 4, and the capacitor protrudes from the upper surface of the board body 31 and extends into the isolation gap 12.

[0062] It can be understood that among the components provided on the brushless motor drive board 3, the axial height of the capacitor is the highest within the range of the board body 31. The axial height of the isolation gap 12 meets the height setting requirements of the capacitor, and thus also meets the height setting requirements of other components on the board body 31. The height of the isolation gap 12 is sufficient to meet the height setting requirements of components with different heights on the board body 31.

[0063] Furthermore, as Figures 5-7 shown, in order to dissipate heat from the brushless motor drive board 3, the brushless motor drive board 3 includes a MOS tube 32 for starting and stopping the brushless motor 2. At least a part of the projection of the slot hole 2512 on the horizontal plane coincides with the MOS tube 32. It can be understood that the rotation of the rotor assembly 23 drives the airflow around it, thereby realizing the dissipation of the heat inside the brushless motor 2 from the slot hole 2512. The airflow directly above the MOS tube 32 when dissipating heat from the slot hole 2512 enables the airflow above the MOS tube 32 to move, thereby taking away the heat generated near the MOS tube 32. The slot hole 2512 not only realizes the heat dissipation inside the brushless motor 2 but also dissipates heat from the MOS tube 32 by means of the airflow movement at the same time. One hole has multiple functions, reducing the setting of other heat dissipation components, simplifying the structure, and greatly improving the heat dissipation efficiency, effectively avoiding excessive local temperature rise inside the main machine housing 1. Secondly, since more heat is generated on the MOS tube 32 on the brushless motor drive board 3, dissipating heat from the MOS tube 32 also realizes the heat dissipation of the brushless motor drive board 3, preventing its temperature from rising too fast.

[0064] As Figure 7As shown, the projection of the slot hole 2512 on the horizontal plane is located within the isolation gap 12. It can be understood that the heat in the inner cavity 27 dissipates through the slot hole 2512 within the isolation gap 12. Sequentially, a longitudinal heat dissipation self-circulation is formed by the inner cavity 27, the isolation gap 12, and the sealing cavity 11. Since the slot hole 2512 is aligned with the isolation gap 12, the heat dissipation in the longitudinal direction is not blocked, enabling the heat in the sealing cavity 11 to be quickly self-digested, avoiding excessive temperature rise in a local space, and improving the self-cooling ability inside the main body.

[0065] In one embodiment, as Figure 7 shown, the height of the sealing cavity 11 is H1, and the height of the isolation gap 12 is H2, where H1:H2 is 4 - 15. It should be noted that H2 is the distance between the upper end face of the plate body 31 and the lower end face of the lower plate 251. In this embodiment, the area of the lower plate 251 near the center bulges outward, and H2 is the distance between the end face of the non-bulging area of the lower plate 251 and the upper end face of the plate body 31. Preferably, H1:H2 is 4.4, H1 is 81 mm, and H2 is 18.5 mm.

[0066] It can be understood that when H1:H2 is 4 - 15, it can not only ensure sufficient installation space for components with different heights on the brushless motor drive board 3, but also prevent the stator assembly 22 and the rotor assembly 23 from generating electromagnetic interference to the components. At the same time, it also makes the height of the main body housing 1 as flat as possible, which is beneficial to improving the portability of the food processor. In the small space of the main body, it also provides as much heat dissipation space as possible to achieve self-circulation heat dissipation, preventing excessive local temperature rise inside the main body and affecting the service life of components. When H1:H2 is less than 4, the height of the isolation gap 12 is too large, resulting in an oversized main body housing 1, which is not conducive to miniaturization of the main body and greatly reduces portability. When H1:H2 is greater than 15, the height of the isolation gap 12 is too small, which may not meet the installation space requirements of the components on the brushless motor drive board 3, and there is also a possibility of electromagnetic interference.

[0067] In one embodiment, as Figure 5 、 Figure 7 shown, the brushless motor 2, the brushless motor drive board 3, and the battery 4 are stacked in sequence along the axis. The portable food processor further includes a barrier member 5 disposed between the brushless motor drive board 3 and the battery 4, and the barrier member 5 is fixedly installed with the main body housing 1.

[0068] It can be understood that since the battery 4 needs to be away from the heat source to prevent potential safety hazards caused by overheating of the battery 4, and since the brushless motor 2 generates more heat, the battery 4 is arranged at the bottom of the sealed cavity 11 to keep the battery 4 away from the brushless motor 2. Secondly, since the brushless motor drive board 3 also generates a certain amount of heat, which will affect the temperature rise of the battery 4, a barrier member 5 is arranged between the battery 4 and the brushless motor drive board 3 to separate the brushless motor drive board 3 from the battery 4, providing a heat insulation protection for the battery 4, so that the local temperature rise inside the host does not become too fast, and the heat can be dispersed as much as possible, further facilitating the self-cooling inside the host. Furthermore, the host housing 1 is cylindrical, and the brushless motor 2, the brushless motor drive board 3, and the battery 4 are stacked axially in sequence, which is beneficial to reducing the radial size of the host housing 1, making the host more miniaturized and improving portability.

[0069] Specifically, as Figure 6 shown, the barrier member 5 includes a barrier member body 51 locked to the brushless motor drive board 3, and a side portion 52 provided at the edge of the barrier member body 51 and located outside the isolation gap 12. The battery 4 is press-fitted between the barrier member body 51 and the bottom of the host housing 1, and the side portion 52 is fixedly connected to the host housing 1.

[0070] It can be understood that the barrier member body 51 is in a plate shape. The brushless motor drive board 3 is locked to the barrier member body 51 by a plurality of screws. The side portion 52 includes a side plate perpendicularly arranged with the barrier member body 51. A first mounting post 521 is formed on the outer side surface of the side plate, and a first mounting hole penetrating up and down is formed in the first mounting post 521. The host housing 1 includes a host upper cover 13 and a base 14. A second mounting post 131 extending downward is provided at the bottom of the host upper cover 13, and a third mounting post 141 extending upward is provided on the base 14. A second mounting hole recessed downward is formed at the upper end of the third mounting post 141. The second mounting post 131 passes through the first mounting hole and extends into the second mounting hole and is locked, realizing the fixed connection between the side portion 52 and the host housing 1. The side portion 52 and the barrier member body 51 are integrally formed, thereby realizing the sequential fixed connection of the host upper cover 13, the barrier member 5, and the base 14 from top to bottom.

[0071] Secondly, there is a gap after the installation of the barrier member body 51 and the base 14. This gap is used to accommodate the battery 4. The battery 4 is arranged horizontally, and the height of this gap is approximately equal to the height of the battery 4, so that the battery 4 can be press-fitted between the barrier member body 51 and the base 14. The battery 4 can be fixedly installed without setting any screws, realizing screw-free installation of the battery 4, greatly simplifying the structure and improving the installation efficiency.

[0072] In one embodiment, as Figure 5 、 Figure 7As shown, the isolation gap 12 is provided between the brushless motor drive board 3 and the lower end cover 25. A wiring terminal 33 electrically connected to the battery 4 is provided on the edge of the brushless motor drive board 3, and the wiring terminal 33 is located radially outside the isolation gap 12.

[0073] It can be understood that the brushless motor drive board 3 further includes an extension 34 provided on the edge of the board body 31. The extension 34 extends radially outward, and the extension 34 is outside the isolation gap 12 in the radial direction. Since the height of the wiring terminal 33 is the largest among the components on the board body 31, the wiring terminal 33 is provided on the extension 34, so that the wiring terminal 33 is located outside the isolation gap 12 and not in the isolation gap 12. Even if the height of the isolation gap 12 is less than the height of the wiring terminal 33, the installation can be completed without interference, the height of the isolation gap 12 can be reduced, and then the height of the main body housing 1 can be reduced, which is more conducive to the flattening of the main body and improves portability. Secondly, since the volume of the wiring terminal 33 is large, if it extends into the isolation space, it will occupy a large amount of space, greatly reducing the heat dissipation space in the isolation space. Based on this, the wiring terminal 33 is provided radially outside the isolation gap 12, so that there is a larger space in the isolation gap 12 for heat dissipation.

[0074] Specifically, the setting position of the wiring terminal 33 in the axial direction: the upper end face of the wiring terminal 33 is higher than the upper end face of the brushless motor drive board 3, and the height of the wiring terminal 33 overlaps at least part of the height of the isolation gap 12. It can be understood that the height of the wiring terminal 33 can be less than the height of the isolation gap 12, and the height of the wiring terminal 33 can also be greater than or equal to the height of the isolation gap 12. When the height of the isolation gap 12 meets the installation requirements of the components on the board body 31, the height of the isolation gap 12 is set as low as possible, which is more conducive to the flattening of the main body and improves portability.

[0075] In one embodiment, the portable food processor further includes a battery 4 electrically connected to the brushless motor 2. The brushless motor 2 and the battery 4 are both installed in the sealed cavity 11, and the single continuous working time of the battery 4 is less than or equal to 600S. It can be understood that the main body housing 1 of the portable food processor is a closed sealed cavity 11. In order to further protect the normal operation of the main body and prevent the temperature rise in the main body from being too fast, when working at the maximum power, the single continuous working time of the battery 4 is set to be at most 600S, which is a self-cooling protection for the portable food processor.

[0076] In one embodiment, as Figure 1 、 Figure 8As shown, the upper end cover 24 and the lower end cover 25 are respectively provided with openings at the joint of the two. One of the outer side surfaces of the upper end cover 24 and the outer side surface of the lower end cover 25 is provided with a mounting portion 242. The mounting portion 242 is locked to the main body housing 1, and one end portion of the mounting portion 242 close to the opening is flush with the opening.

[0077] It can be understood that in this embodiment, the mounting portion 242 is provided on the outer side surface of the upper end cover 24. The mounting portion 242 is locked to the main body housing 1 to realize the fixation of the upper end cover 24 to the main body housing 1. Since the upper end cover 24 and the lower end cover 25 are locked and connected up and down, the brushless motor 2 is hoisted in the main body housing 1. The bottom of the mounting portion 242 is flush with the opening at the bottom of the upper end cover 24. Only one positioning is required to process the end surface of the opening of the upper end cover 24 and the bottom end surface of the mounting portion 242, reducing the number of positionings and thus greatly improving the processing efficiency.

[0078] In addition to the above preferred embodiments, the technical solutions protected by the present invention are not limited to the above embodiments. It should be noted that the combination of multiple technical solutions in any one embodiment, as well as the combination of the technical solutions in any one embodiment with the technical solutions in one or more other embodiments, are within the protection scope of the present invention. Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope required to be protected by the present invention.

Claims

1. A portable food processor, characterized in that: include: A host housing having a closed sealed cavity; A brushless motor, comprising a motor housing installed in the sealed cavity, a stator assembly installed in the inner cavity of the motor housing, and a rotor assembly arranged in the stator assembly, wherein a slot hole communicating with the inner cavity is formed through the motor housing, and the motor housing comprises a lower end cover at least partially surrounding the stator assembly and the rotor assembly; A brushless motor drive board is installed in the sealed cavity and is located below the lower end cover. The brushless motor drive board is electrically connected to the brushless motor. An isolation gap is provided between the brushless motor drive board and the lower end cover.

2. The portable food processor according to claim 1, characterized in that: The projection of the slot on the horizontal plane is located within the isolation gap.

3. The portable food processor according to claim 1, characterized in that: The brushless motor driving board comprises a board body arranged in the sealed cavity, and a capacitor arranged on the board body, wherein the capacitor protrudes from the upper surface of the board body and extends into the isolation gap.

4. The portable food processor according to claim 1, characterized in that: The brushless motor driving board includes a MOS tube for starting and stopping the brushless motor, and the projection of at least part of the slots on the horizontal plane coincides with the MOS tube.

5. The portable food processor according to claim 1, characterized in that: The inner cavity has an installation space surrounding the outer circumference of the rotor assembly, and the stator assembly is arranged in the installation space. The projection of part of the installation space on the horizontal plane coincides with the slot hole.

6. The portable food processor according to any one of claims 1 to 5, characterized in that: The height of the sealed cavity is H1, the height of the isolation gap is H2, and H1:H2 is 4-15.

7. The portable food processor according to claim 1, characterized in that: The portable food processor also includes a battery electrically connected to the brushless motor drive board, the brushless motor, the brushless motor drive board and the battery are stacked in sequence along the axial direction, and the portable food processor also includes a barrier arranged between the brushless motor drive board and the battery, and the barrier is fixed to the main housing.

8. The portable food processor according to claim 7, characterized in that: The barrier member includes a barrier member body locked with the brushless motor drive plate, and a side portion arranged at the edge of the barrier member body and located at the periphery of the isolation gap, the battery is pressed between the barrier member body and the bottom of the host shell, and the side portion is fixedly connected to the host shell.

9. The portable food processor according to claim 7, characterized in that: The isolation gap is arranged between the brushless motor drive board and the lower end cover. A connection terminal electrically connected to the battery is arranged on the edge of the brushless motor drive board. The connection terminal is located radially outside the isolation gap.

10. The portable food processor according to claim 9, characterized in that The upper end surface of the connection terminal is higher than the upper end surface of the brushless motor driving board, and the height of the connection terminal overlaps with at least a portion of the height of the isolation gap.

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