WO2019000210A1

WO2019000210A1 - Transmission structure for bean-grinding coffee machine

Info

Publication number: WO2019000210A1
Application number: PCT/CN2017/090273
Authority: WO
Inventors: 王学斌
Original assignee: 广州康宏科技股份有限公司
Priority date: 2017-06-27
Filing date: 2017-06-27
Publication date: 2019-01-03

Abstract

A transmission structure for a bean-grinding coffee machine: by means of configuring the fit between a motor shaft (54) and a blade shaft and the fit between the blade shaft and a seal bearing (25) to be small clearance fits, configuring the fit between a blade shaft assembly (26) and a bean grinding box to be a large clearance fit, and further configuring the bond between the seal bearing (25) and the blade shaft to be a hard bond, and configuring the bond between a blade shaft sealing ring (24) and the seal bearing (25) as well as the bond between the blade shaft sealing ring (24) and a bean grinding box assembly (1) to be soft bond, thereby ensuring that when the bean-grinding coffee machine operates, the vibration of the motor shaft (54) and the vibration of the blade shaft will not be transferred to the bean grinding box, while liquid leakage may be prevented, and the goals of shock absorption, noise reduction and sealing may be achieved.

Description

Grinding coffee machine transmission structure

Technical field

The invention relates to the technical field of small household appliances, and more particularly to a transmission structure of a grinder coffee machine, which has the advantages of low noise and no leakage.

Background technique

At present, the general grinder coffee machine in the market is driven by a motor to rotate the grinder at a high speed to achieve grinding of the coffee beans. However, since the motor shaft and the grinder component are not integrally formed, a clutch connection is usually employed. Therefore, when the coffee machine grinder is running at a high speed, the motor and the grinder will generate a large vibration, and the concentricity of the two is large, so that a large noise is generated. In addition, if the distance between the cutter shaft and the grinding bean box is too small, when the cutter shaft vibrates, the cutter shaft will cause the grinding bean box to vibrate together, which also generates noise, thereby affecting the user experience.

On the other hand, if the seal between the transmission structure of the coffee bean machine and the cavity containing the liquid is poor, the coffee powder will enter the transmission structure during operation of the coffee bean machine, such as entering the knife shaft assembly. Moreover, if the components in the transmission structure are poorly sealed, the liquid in the cavity of the coffee bean machine may enter the blade assembly, which may cause the liquid to leak out, resulting in difficulty in cleaning and inconvenience in use.

Summary of the invention

In order to overcome at least one of the above-mentioned drawbacks of the prior art, the present invention provides a grinder coffee machine transmission structure, which has the advantages of low noise, no leakage, and the like.

In order to solve the above technical problems, the technical solution adopted by the present invention is:

A grinder coffee machine transmission structure comprises a grinder box assembly, a grinder cutter assembly, a cutter shaft seal ring fixing ring, a lower end cover and a motor assembly, and the lower end cover fixes the cutter shaft seal ring fixing ring to the grinder box assembly ;

The grinder cutter assembly is provided with a cutter shaft assembly having a cutter shaft and a cutter shaft hole; the motor assembly is provided with a spring pin, a motor shaft and a motor main body, and the cutter shaft assembly passes through a spring pin and a motor bush sleeve penetrating the motor shaft Connect

Wherein, the matching gap between the cutter shaft of the cutter shaft assembly and the motor shaft is M, the gap between the outer side surface of the cutter shaft assembly and the grinding bean box is K, and when the cutter shaft rotates, the outer side of the cutter shaft assembly faces outward. The maximum radial sloshing amplitude is N, such that K>M+N.

Since the cutter shaft and the motor shaft are closely fitted, a small clearance fit is provided between the two, that is, in the case where the cutter shaft can be smoothly inserted into the motor shaft, the fitting clearance M is made as small as possible, so that the cutter shaft and the motor shaft can be ensured. Concentricity to reduce vibration and reduce noise. Secondly, there is a large clearance fit between the cutter shaft assembly and the grinding bean box, so that K>M+N, to ensure that the vibration generated when the cutter shaft rotates at high speed is not transmitted to the grinding bean box, and also plays the role of shock absorption and noise reduction. Effect.

Moreover, the grinder cutter assembly further includes a blade, a blade seal, a blade seal ring and a sealed bearing, wherein the cutter seal is installed between the blade and the cutter ring seal ring, and the seal bearing is mounted on the cutter shaft The outer end of the component and the sealed bearing The sleeve shaft seal ring and the cutter shaft seal ring are fixed to the grinder box assembly by the cutter shaft seal ring fixing ring.

When the grinder coffee machine performs the grinding operation, the knife shaft seal can block the coffee powder in the grinder from entering the cutter shaft assembly; when the liquid contacts the cutter shaft assembly, the sealed bearing is closely attached to the cutter shaft, so the sealed bearing It can effectively prevent liquid leakage.

Preferably, the motor component is further provided with a motor upper shock block, a motor lower shock block and a motor bracket, wherein the motor upper shock block is installed on an upper part of the motor body, and the motor lower shock block is mounted on the motor The lower part of the main body and the lower vibration damping block of the motor are installed between the motor main body and the motor bracket.

The upper shock absorbing block of the motor and the lower shock absorbing block of the motor are respectively located at the upper part and the lower part of the motor main body. When the motor is running, the shock absorbing block on the motor and the lower shock absorbing block of the motor can absorb the vibration generated by the motor, thereby achieving shock absorption and lowering. The purpose of noise. Moreover, the motor bracket provides enhanced stability to the motor assembly.

Preferably, the seal bearing and the arbor seal ring retaining ring are made of a rigid material, and the arbor seal ring is made of an elastic material.

On the one hand, since the cutter shaft and the seal bearing are both made of a hard rigid material, the fit between the two is also a small clearance fit. Therefore, when the coffee machine grinds the operation, the cutter shaft can rotate smoothly without leaking the liquid to the outside, and functions as a seal. On the other hand, the cutter shaft seal ring holds the seal bearing, and the liquid does not leak outward through the seal bearing to function as a seal. In addition, the cutter shaft seal ring is made of soft elastic material and has a good shock-absorbing function. Also, because the soft blade seal ring is firmly fixed to the grinder by the cutter ring seal ring, the vibration of the cutter shaft is not transmitted to the grinder and does not cause leakage.

More preferably, the rigid material is a fluororubber having a stainless steel skeleton.

More preferably, the elastic material is a gas phase silica gel or a fluororubber.

Compared with the prior art, the beneficial effects of the present invention are:

The invention provides a transmission structure of a grinder coffee machine, and the cooperation between the cutter shaft assembly and the grinding bean box is set by setting the cooperation between the motor shaft and the cutter shaft and the cooperation between the cutter shaft and the seal bearing as a small clearance fit. For large clearance fit, and the combination between the sealed bearing and the cutter shaft is set as a hard joint, a soft joint is provided between the cutter shaft seal ring and the seal bearing, the cutter shaft seal ring and the grinder box assembly to ensure When the coffee bean machine is running, the vibration of the motor shaft and the vibration of the shaft will not be transmitted to the grinding box, and at the same time, the liquid leakage can be prevented, and the purpose of shock absorption, noise reduction and sealing can be achieved.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a transmission structure in an embodiment of the present invention.

2 is a schematic view showing a fitting clearance of a transmission structure according to an embodiment of the present invention.

Figure 3 is an exploded view of the grinder component of the transmission structure in accordance with one embodiment of the present invention.

4 is an exploded view of a motor assembly of a transmission structure in accordance with an embodiment of the present invention.

FIG. 5 is a schematic view showing the pin clearance fit between the motor shaft and the cutter shaft assembly of the transmission structure according to an embodiment of the present invention.

Detailed ways

The transmission structure of the low noise and leak-free grinder coffee machine of the present invention will be further described below in conjunction with some specific embodiments. The specific embodiments are intended to describe the invention in further detail, without limiting the scope of the invention.

In the description of the present invention, it should be understood that there are indications of the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outside", etc. Or the positional relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and the simplified description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.

As shown in FIGS. 1 to 5, the transmission structure of the low noise and leak-free coffee bean machine of the present invention comprises a grinder box assembly 1, a grinder cutter assembly 2, a cutter ring seal ring retaining ring 3, a lower end cap 4 and a motor assembly 5.

Among them, the grinder cutter assembly 2 includes a cutter shaft nut 21, a blade 22, a cutter shaft seal 23, a cutter shaft seal ring 24, a seal bearing 25, and a cutter shaft assembly 26. The seal bearing 25 is mounted on the cutter shaft assembly 26 and the outer end of the seal bearing 25 is sleeved with the cutter shaft seal ring 24, and the cutter shaft seal ring 24 is fixed to the grinder box assembly 1 by the cutter shaft seal ring retaining ring 3, and the cutter shaft seal The pad 23 is mounted between the blade 22 and the blade seal ring 24. Further, the lower end of the grinder cutter assembly 2 is provided with a lower end cap 4 which is fixed to the grinder box assembly 1 by a screw connection (such as a fixing screw 6).

The motor assembly 5 includes a spring pin 51, a motor bushing 52, a motor upper damper block 53, a motor shaft 54, a motor body 55, a motor lower damper block 56, a motor bracket 57, and a screw 58. Since the arbor assembly 26 has a arbor hole, the arbor assembly 26 can be engaged with the motor shaft 54 by a spring pin 51 that extends through the motor shaft 54. When the motor is started, the torque of the motor shaft 54 is transmitted through the spring pin 51 to the arbor assembly 26 and thus the blade on the arbor assembly 26 is rotated. The motor upper damper block 53 is mounted on the upper portion of the motor body 55, the motor lower damper block 56 is mounted on the lower portion of the motor body 55, and the motor lower damper block 56 is mounted between the motor body 55 and the motor bracket 57.

There is a small clearance fit between the cutter shaft of the cutter shaft assembly 26 and the motor shaft 54 with a matching clearance M; a large clearance fit between the outer side surface of the cutter shaft assembly 26 and the grinding bean box, the gap is K; When rotated, the maximum radial sway amplitude of the outer side of the arbor assembly 26 is N, and K > M + N.

The seal bearing 25 is made of fluororubber having a stainless steel skeleton, and the arbor seal ring 24 is made of fumed silica.

Example 1

In the present embodiment, K is 0.9, M is 0.01, and N is 0.3, that is, K>M+N.

When the grinder coffee machine was started, the noise generated by the grinding process was measured to be 70 decibels. There is no liquid leakage throughout the preparation of the coffee.

Example 2

In the present embodiment, K is 0.5, M is 0.1, and N is 0.3, that is, K>M+N.

When the grinder coffee machine was started, the noise generated by the grinding process was measured to be 75 decibels. There is no liquid leakage throughout the preparation of the coffee.

Comparative example 1

In the present comparative example, K is 0.2, M is 0.1, and N is 0.3, that is, K < M + N.

When the grinder coffee machine was started, the noise generated by the grinding process was measured to be 80 decibels. There is no liquid leakage throughout the preparation of the coffee.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

A grinder coffee machine transmission structure comprising a grinder box assembly (1), a grinder cutter assembly (2), a cutter shaft seal ring retaining ring (3), a lower end cap (4) and a motor assembly (5), The lower end cover (4) fixes the cutter ring seal ring (3) to the grinder box assembly (1);

Wherein, the grinder cutter assembly (2) is provided with a cutter shaft assembly (26) having a cutter shaft and a cutter shaft hole; the motor assembly (5) is provided with a spring pin (51) and a motor shaft (54) And the motor body (55), and the tool shaft assembly (26) is sleeved with the motor shaft (54) through a spring pin (51) extending through the motor shaft (54);

The utility model is characterized in that the matching gap between the cutter shaft of the cutter shaft assembly (26) and the motor shaft (54) is M, and the gap between the outer side surface of the cutter shaft assembly (26) and the grinding bean box is K, when the cutter shaft When rotating, the maximum radial sway amplitude of the outer side of the arbor assembly (26) is N, such that K>M+N;

The grinder knife assembly (2) further includes a blade (22), a blade seal (23), a blade seal ring (24), and a sealed bearing (25), wherein the blade seal (23) is mounted Between the blade (22) and the cutter ring seal ring (24), the seal bearing (25) is mounted on the cutter shaft assembly (26) and the outer end of the seal bearing (25) is sleeved with the cutter shaft seal ring (24), and the cutter The shaft seal ring (24) is fixed to the grinder box assembly (1) by the cutter shaft seal ring retaining ring (3).
The grinder coffee machine transmission structure according to claim 1, wherein the motor assembly (5) further comprises a motor upper damping block (53), a motor lower damping block (56) and a motor bracket (57). The motor upper damping block (53) is mounted on the upper portion of the motor body (55), the motor lower damping block (56) is mounted on the lower portion of the motor body (55), and the motor lower damping block (56) ) is installed between the motor body (55) and the motor bracket (57).
The grinder coffee machine transmission structure according to claim 1, wherein the seal bearing (25) and the cutter ring seal ring (3) are made of a rigid material, and the cutter shaft seal ring (24) Made of elastic material.
The grinder coffee machine transmission structure according to claim 3, wherein the rigid material is a fluororubber having a stainless steel skeleton.
The grinder coffee machine transmission structure according to claim 3, wherein the elastic material is a gas phase silica gel or a fluororubber.