Grinder device for a coffee machine

Abstract

The utility model discloses a coffee grinder, it includes casing and brushless motor, the fixed cutter head is equipped in the casing, the cutter head is equipped with the cutter bushing, the cutter bushing is connected with the bushing, and the bushing is cooperated in the casing through the bearing, the casing of brushless motor is fixed with the casing, and the bushing is equipped with the synchronous wheel along the outside, and the output shaft of brushless motor is inserted into the casing and is connected with the synchronous wheel through a synchronous belt, and the synchronous wheel is also located in the casing. The device can reduce the motor volume, and the noise is low, and the abrasion is little, and the energy consumption is little.

Description

Technical Field

[0001] This utility model relates to a component of a coffee machine, specifically a coffee grinder. Background Technology

[0002] As a crucial component of coffee machines, the coffee grinder has undergone continuous iteration and upgrades in recent years. A typical coffee grinder consists of a housing and a motor. Inside the housing are the blades and burr holders. The motor drives the burrs and burr holders to rotate relative to each other, grinding the coffee into powder. Most existing coffee grinders use ordinary electric motors, which have relatively low torque and relatively high speed. Therefore, they often incorporate a worm gear transmission structure with a significant reduction ratio. For example, the coffee grinder with application number 2023232607703 uses a worm gear on the output shaft of an ordinary electric motor, with a worm gear fixed outside the burr holder. Relying on the worm gear engagement, the reduction ratio reaches 40 times. However, this structure is noisy, experiences high wear, consumes a lot of energy, has a relatively short lifespan, provides a mediocre user experience, and has a large lateral dimension and volume.

[0003] With advancements in electric motor technology, brushless motors, also known as brushless torque motors, have become popular in the industry. These motors are characterized by high torque, relatively low output speed, and low operating noise. Based on this, the applicant proposed an improved brushless motor solution in 2025 (application number 2025202256660). Figure 1 As shown, this coffee grinder is characterized by comprising only a top cover 101 for mounting the blades 102, and a bushing 103 for securing the stator 104 of the brushless motor. The rotor 105 of the brushless motor is fixed to the blade sleeve 106 to form a rotating body, and the outer wall of the rotor also serves as part of the side housing of the grinder. This grinder utilizes the high torque and low speed characteristics of the brushless motor to form a direct drive, directly driving the blade sleeve to rotate and grind, achieving low noise, low energy consumption, and low wear. However, this improved structure has a major drawback: the brushless motor, as part of the housing, effectively completely encloses the entire grinder, resulting in a large size and high cost for the brushless motor.

[0004] Moreover, both of the above-mentioned coffee grinding devices share a common shortcoming: in order to ensure smooth powder output and avoid blockage of the powder outlet of the shell, a connecting rib is set at the feed inlet of the upper cover, an installation sleeve is set at the inner end of the connecting rib, an installation column is set inside the installation sleeve, a screw-on key is screwed into the top of the installation column and a retaining sleeve is used for limiting, and then a limiting screw is used to lock the vertical groove of the installation column. The installation of the blade is achieved through the above series of complex structures and components. It has many parts, complicated assembly, high cost and high manufacturing cost. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a coffee grinder that can reduce the size of the electric motor and has low noise, low wear and low energy consumption.

[0006] The technical solution of this utility model is to provide a coffee grinding device for a coffee machine, which includes a housing and a brushless motor. A fixed blade is provided inside the housing, and a blade sleeve is provided outside the blade. The blade sleeve is connected to a bushing, and the bushing is fitted inside the housing via a bearing. The outer shell of the brushless motor is fixed to the housing, and a synchronous pulley is provided on the outer edge of the bushing. The output shaft of the brushless motor extends into the housing and is connected to the synchronous pulley via a synchronous belt. The synchronous pulley is also located inside the housing.

[0007] Coffee beans are poured in through the feed inlet at the top of the shell. The brushless motor drives the blade sleeve to rotate via the synchronous belt and synchronous pulley, while the blade head is fixed to the shell. Therefore, the blade sleeve and blade head rotate relative to each other, grinding the beans into powder, which then falls vertically from the powder outlet at the bottom of the shell.

[0008] Compared with existing technologies, the coffee grinding device of the coffee machine with the above structure has the following advantages.

[0009] The brushless motor of this application adopts a transmission structure that drives the burr sleeve via a synchronous belt. Due to the improved performance of the brushless motor itself, it has greater torque and lower speed. Therefore, a synchronous belt drive with a reduction ratio of 5-15 times is sufficient. This results in lower noise, less wear, longer service life, better user experience, and lower energy consumption compared to worm gear drives. More importantly, compared to the improved solution of encasing the entire grinding device with the brushless motor, the brushless motor of this application is significantly smaller in size and model, significantly reducing the cost and manufacturing cost of the brushless motor. Furthermore, the structure of this application is more compact and smaller in size, allowing for a thinner and lighter grinding device design, which is beneficial for the assembly and overall shape of the coffee machine. In addition, the housing of this structure also protects the synchronous belt, preventing powder leakage.

[0010] Preferably, the powder outlet at the bottom of the housing is fixed to a base via a connecting rib, and the cutter head is fixed to the base. The bushing includes an inner bushing and an outer bushing. The synchronous wheel is located on the outer edge of the outer bushing. The cutter head and the inner bushing are fixed to form a lifting assembly. The diameter of the feed inlet at the top of the housing is larger than the outer diameter of the inner bushing. The inner bushing and the outer bushing are circumferentially limited. The inner bushing is provided with a lifting ring for lifting the lifting assembly out of the feed inlet. First, the cutter head is fixed to the powder outlet. Compared with the existing technology that assembles the cutter head at the feed inlet, a series of complex and cumbersome parts such as the mounting sleeve, mounting column, screw key, clamp, and vertical groove are omitted, simplifying the structure, making it easier to assemble, and further reducing costs. Moreover, as the cutter head is lowered, the connecting rib moves from the feed inlet to the powder outlet and no longer blocks the feed inlet. Therefore, people can hold the lifting ring and remove the integrated cutter head and inner bushing from the feed inlet as a whole, thus exposing enough space for people to clean the powder falling on the connecting rib, thereby perfectly solving the problem of easy blockage of the powder outlet after the connecting rib is lowered. In summary, this preferred structure has fewer components, is easier to assemble, has a lower cost, and is easier to clean up powder spillage from the powder outlet.

[0011] As a further preferred embodiment, the inner ring surface of the outer bushing has a protruding locking block, and the outer ring surface of the inner bushing has a concave horizontal groove and a vertical notch. The upper part of the vertical notch is connected to the horizontal groove. Each locking block corresponds to a horizontal groove and a vertical notch. Each locking block reaches the corresponding horizontal groove from the corresponding vertical notch and abuts against the bottom of the horizontal groove. In this way, after the powder outlet is cleaned, the lifting component is lowered, so that the locking block slides along the vertical notch to the horizontal groove. Then, the lifting component is rotated circumferentially, so that the locking block slides along the horizontal groove to the bottom of the horizontal groove. One release and one rotation complete the locking and circumferential limiting of the lifting component and the outer bushing. Conversely, one rotation and one lift in the opposite direction complete the disengagement of the lifting component from the main body of the grinding device. Therefore, the operation is convenient.

[0012] As a further optimization, a vertical locking pin is provided in the horizontal groove, and a vertical locking groove is provided on the inner surface of the locking block. The vertical locking pin is locked in the corresponding vertical locking groove. In this way, when the assembly is rotated and pulled horizontally, both the vertical locking pin and the locking block have a certain degree of elasticity. The two are elastically locked together to ensure that the blade sleeve, inner liner and outer liner are tightly connected during the grinding process, ensuring the stability of the grinding process. When the assembly is disassembled, the vertical locking pin and the locking block are also elastic. With a little force, the vertical locking pin and the locking block can be disassembled, ensuring that the disassembly process is convenient.

[0013] As another preferred option, the housing is composed of an upper shell and a lower shell connected together, with the feed inlet located in the upper shell and the powder outlet located in the lower shell. The housing of the brushless motor is fixed to the lower part of the lower shell. In this way, the arrangement of the upper and lower shells can not only protect the internal structure such as the timing belt, but also further highlight the flat shape, making it easy to assemble the grinding device inside the coffee machine.

[0014] As another preferred embodiment, a bolt head is held in the center hole of the base, the bolt shank passes through the center hole of the base and the center hole of the cutter head, and a locking nut is screwed on the top of the bolt shank, which is locked in the upper opening of the center hole of the cutter head; the base is provided with an upper protrusion, and the bottom of the cutter head is provided with a positioning recess, the upper protrusion engaging with the positioning recess; in this way, the cutter head and the housing are quickly and conveniently assembled, and the assembly effect is firm and reliable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the grinding device in a current coffee machine.

[0016] Figure 2 This is a schematic diagram of the grinding device of the coffee machine of this utility model.

[0017] Figure 3 This is a half-sectional view of the grinding device of the coffee machine of this utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the coffee grinder's lifting assembly after separation.

[0019] Figure 5yes Figure 2 A schematic diagram of the structure after being deflected at a certain angle.

[0020] Figure 6 This is a schematic diagram of the coffee grinding device of this utility model after removing the upper shell.

[0021] Figure 7 yes Figure 4 An enlarged schematic diagram of part A in the middle.

[0022] Figure 8 yes Figure 4 Enlarged schematic diagram of part B.

[0023] The figure shows

[0024] Existing technical components: 101, top cover; 102, cutter head; 103, bushing; 104, stator; 105, rotor; 106, cutter sleeve.

[0025] The components of this application are as follows: 1. Brushless motor, 2. Upper housing, 3. Lower housing, 4. Cutting head, 4.1. Positioning recess, 5. Connecting rib, 6. Base, 6.1. Upper protrusion, 7. Bolt, 8. Locking nut, 9. Cutting sleeve, 10. Inner bushing, 11. Outer bushing, 12. Synchronous pulley, 13. Synchronous belt, 14. Output gear, 15. Lifting ring, 16. Locking block, 17. Horizontal groove, 18. Vertical notch, 19. Vertical locking pin, 20. Vertical locking groove, 21. Liner ring, 22. Lower brush bristles, 23. Upper brush bristles, 24. Upper bearing, 25. Lower bearing. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 2-8 As shown, the coffee grinding device of this utility model includes a housing and a brushless motor 1. The housing is formed by screwing together an upper shell 2 and a lower shell 3. The feed inlet is located at the upper part of the upper shell 2, and the powder outlet is located at the lower part of the lower shell 3. The outer shell of the brushless motor 1 is fixed to the lower part of the lower shell 3.

[0028] The housing contains a fixed cutter head 4. The powder outlet of the lower housing 3 is fixed to the base 6 via two connecting ribs 5, and the cutter head 4 is screwed onto the base 6. More specifically, the center hole of the base 6 holds the head of a bolt 7. The shank of the bolt 7 passes through the center hole of the base 6 and the center hole of the cutter head 4, and a locking nut 8 is screwed onto the top of the shank of the bolt 7. The locking nut 8 is locked in the upper opening of the center hole of the cutter head 4. The base 6 has an upper protrusion 6.1, and the bottom of the cutter head 4 has a positioning recess 4.1 that corresponds one-to-one with the upper protrusion 6.1. Each upper protrusion 6.1 engages with the corresponding positioning recess 4.1.

[0029] The blade head 4 is provided with a blade sleeve 9, which is connected to a bushing. The bushing is fitted inside the housing via a bearing. Specifically, the bushing includes an inner bushing 10 and an outer bushing 11. The blade sleeve 9 is fixed to the inner bushing 10, and the inner bushing 10 and the outer bushing 11 are circumferentially limited. In other words, the blade sleeve 9, the inner bushing 10, and the outer bushing 11 rotate synchronously during grinding. The outer bushing 11 is rotatably connected to the upper housing 2 via an upper bearing 24, and is rotatably connected to the lower housing 3 via a lower bearing 25.

[0030] The outer bushing 11 has a synchronous pulley 12 on its outer edge. The output shaft of the brushless motor 1 extends into the housing and the output shaft has an output gear 14. The output gear 14 is connected to the synchronous pulley 12 via a synchronous belt 13. The synchronous pulley 12 is also located inside the housing.

[0031] The blade sleeve 9 and the inner liner 10 are fixed to form a lifting assembly. The diameter of the feed inlet at the top of the upper shell 2 is larger than the outer diameter of the inner liner 10. The inner liner 10 is provided with a lifting ring 15 for lifting the feed inlet of the lifting assembly.

[0032] The circumferential limiting structure of the inner bushing 10 and the outer bushing 11 is as follows. The inner ring surface of the outer bushing 11 has two protruding locking blocks 16. The outer ring surface of the inner bushing 10 is provided with two concave horizontal grooves 17 and two vertical notches 18. The upper part of each vertical notch 18 is connected to the horizontal groove 17 on the same side. In this way, each locking block 16 corresponds to one horizontal groove 17 and one vertical notch 18. When the lifting assembly is lowered, each locking block 16 will move up along the corresponding vertical notch 18 to the corresponding horizontal groove 17. Then, the lifting assembly is screwed on so that the locking block 16 abuts against the bottom end of the horizontal groove 17.

[0033] To enhance the engagement effect between the card block 16 and the corresponding horizontal groove 17, a vertical locking pin 19 is provided in the horizontal groove 17, and a vertical locking groove 20 is provided on the inner surface of the card block 16. When the card block 16 abuts against the bottom of the corresponding horizontal groove 17, the vertical locking pin 19 is locked in the corresponding vertical locking groove 20.

[0034] The powder outlet of the lower shell 3 is provided with a liner ring 21, and a ring of lower bristles 22 is provided inside the liner ring 21. The lower bristles 22 abut against the lower part of the outer sleeve 11; the upper part of the outer sleeve 11 is provided with a ring of upper bristles 23, and the upper bristles 23 abut against the upper shell 2.

Claims

1. A coffee grinder for a coffee machine, comprising a housing and a brushless motor, wherein a fixed blade is disposed within the housing, a blade sleeve is disposed outside the blade, the blade sleeve is connected to a bushing, and the bushing is fitted within the housing via a bearing; characterized in that: The outer casing of the brushless motor is fixed to the housing, and a synchronous pulley is provided on the outer edge of the bushing. The output shaft of the brushless motor extends into the housing and is connected to the synchronous pulley via a synchronous belt; the synchronous pulley is also located inside the housing.

2. The coffee grinding device of the coffee machine according to claim 1, characterized in that: The powder outlet at the bottom of the housing is fixed to a base via a connecting rib, and the cutter head is fixed to the base. The bushing includes an inner bushing and an outer bushing. The synchronous wheel is located on the outer edge of the outer bushing. The cutter sleeve and the inner bushing are fixed to form a lifting assembly. The inlet diameter at the top of the housing is larger than the outer diameter of the inner bushing. The inner bushing and the outer bushing are circumferentially limited. The inner bushing is provided with a lifting ring for lifting the lifting assembly out of the inlet.

3. The coffee grinding device of the coffee machine according to claim 2, characterized in that: The inner ring surface of the outer bushing has a protruding locking block, and the outer ring surface of the inner bushing has a concave horizontal groove and a vertical notch. The upper part of the vertical notch is connected to the horizontal groove. Each locking block corresponds to a horizontal groove and a vertical notch. Each locking block reaches the corresponding horizontal groove from the corresponding vertical notch and abuts against the bottom end of the horizontal groove.

4. The coffee grinding device of the coffee machine according to claim 3, characterized in that: A vertical locking pin is provided in the horizontal groove, and a vertical locking groove is provided on the inner surface of the locking block. The vertical locking pin is locked in the corresponding vertical locking groove.

5. The coffee grinding device of the coffee machine according to claim 2, characterized in that: The housing consists of an upper shell and a lower shell connected together. The feed inlet is located in the upper shell, the powder outlet is located in the lower shell, and the housing of the brushless motor is fixed to the lower part of the lower shell.

6. The coffee grinding device of the coffee machine according to claim 2, characterized in that: A bolt head is held in the center hole of the base. The bolt shank passes through the center hole of the base and the center hole of the cutter head, and a locking nut is screwed on the top of the bolt shank. The locking nut is locked in the upper opening of the center hole of the cutter head. The base is provided with an upper protrusion, and the bottom of the cutter head is provided with a positioning recess. The upper protrusion engages with the positioning recess.

Images