CN107440553B

CN107440553B - Transmission structure of bean grinding coffee machine

Info

Publication number: CN107440553B
Application number: CN201710501078.5A
Authority: CN
Inventors: 王学斌
Original assignee: Guangzhou Conwide Technology Co ltd
Current assignee: Guangzhou Conwide Technology Co ltd
Priority date: 2017-06-27
Filing date: 2017-06-27
Publication date: 2023-05-02
Anticipated expiration: 2037-06-27
Also published as: CN107440553A

Abstract

The invention provides a transmission structure of a bean grinding coffee machine, which is characterized in that the fit between a motor shaft and a cutter shaft and the fit between the cutter shaft and a sealing bearing are small clearance fit, the fit between a cutter shaft assembly and a bean grinding box is large clearance fit, the combination between the sealing bearing and the cutter shaft is hard, and the combination between a cutter shaft sealing ring and the sealing bearing and between the cutter shaft sealing ring and the bean grinding box assembly is soft, so that when the bean grinding coffee machine operates, the vibration of the motor shaft and the vibration of the cutter shaft are not transmitted to the bean grinding box, liquid leakage can be prevented, and the purposes of shock absorption, noise reduction and sealing are achieved.

Description

Transmission structure of bean grinding coffee machine

Technical Field

The invention relates to the technical field of small household appliances, in particular to a transmission structure of a bean grinding coffee machine, which has the advantages of low noise and no leakage.

Background

At present, a general bean grinding coffee machine is to drive a bean grinding knife to rotate at a high speed by a motor so as to grind coffee beans. However, since the motor shaft and the bean grinder assembly are not integrally formed, a clutch is generally used for connection. Therefore, when the bean grinding cutter of the coffee machine runs at high speed, the motor and the bean grinding cutter generate larger vibration, and the concentricity of the motor and the bean grinding cutter is larger, so that larger noise is generated. In addition, if the distance between the cutter shaft and the bean grinding box is too small, when the cutter shaft vibrates, the cutter shaft drives the bean grinding box to vibrate together, noise is generated, and therefore the use experience of a user is affected.

On the other hand, if the seal between the drive structure of the coffee grinder and the liquid-filled cavity is poor, the ground coffee may enter the drive structure, such as the arbor assembly, during operation of the coffee grinder. Moreover, if the sealing of each part in the transmission structure is poor, after the liquid in the cavity of the coffee grinder enters the cutter shaft assembly, the liquid can leak outwards, so that the cleaning is difficult and the use is inconvenient.

Disclosure of Invention

In order to overcome at least one defect in the prior art, the invention provides a transmission structure of a coffee grinder, which has the advantages of low noise, no leakage and the like.

In order to solve the technical problems, the invention adopts the following technical scheme:

the transmission structure of the bean grinding coffee machine comprises a bean grinding box component, a bean grinding cutter component, a cutter shaft sealing ring fixing ring, a lower end cover and a motor component, wherein the lower end cover is used for fixing the cutter shaft sealing ring fixing ring to the bean grinding box component;

the bean grinding cutter assembly is provided with a cutter shaft assembly, and the cutter shaft assembly is provided with 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 is sleeved with the motor shaft through the spring pin penetrating through the motor shaft;

the clearance between the cutter shaft of the cutter shaft assembly and the motor shaft is M, the clearance between the outer side face of the cutter shaft assembly and the bean grinding box is K, and when the cutter shaft rotates, the maximum radial shaking amplitude of the outer side face of the cutter shaft assembly outwards is N, so that K is more than M+N.

Because the cutter shaft is tightly attached to the motor shaft, the cutter shaft and the motor shaft are in small clearance fit, namely, under the condition that the cutter shaft can be smoothly inserted into the motor shaft, the fit clearance M is as small as possible, so that the concentricity of the cutter shaft and the motor shaft can be ensured, and the effects of reducing vibration and noise are achieved. Secondly, the cutter shaft component and the bean grinding box are in large clearance fit, so that K is more than M+N, vibration generated when the cutter shaft rotates at high speed is prevented from being transmitted to the bean grinding box, and the effects of shock absorption and noise reduction are achieved.

And the bean grinding cutter assembly further comprises a blade, a cutter shaft sealing gasket, a cutter shaft sealing ring and a sealing bearing, wherein the cutter shaft sealing gasket is arranged between the blade and the cutter shaft sealing ring, the sealing bearing is arranged on the cutter shaft assembly, the outer end of the sealing bearing is sleeved with the cutter shaft sealing ring, and the cutter shaft sealing ring is fixed on the bean grinding box assembly by the cutter shaft sealing ring fixing ring.

When the bean grinding coffee machine performs bean grinding operation, the cutter shaft sealing gasket can prevent coffee powder in the bean grinding box from entering the cutter shaft assembly; when the liquid contacts the cutter shaft assembly, the sealing bearing is tightly attached to the cutter shaft, so that the sealing bearing can effectively prevent the liquid from leaking.

Preferably, the motor assembly is further provided with an upper motor damper, a lower motor damper and a motor bracket, wherein the upper motor damper is mounted on the upper portion of the motor body, the lower motor damper is mounted on the lower portion of the motor body, and the lower motor damper is mounted between the motor body and the motor bracket.

The motor upper shock-absorbing block and the motor lower shock-absorbing block are respectively positioned at the upper part and the lower part of the motor main body, and when the motor operates, the motor upper shock-absorbing block and the motor lower shock-absorbing block can absorb the shock generated by the motor, so that the purposes of shock absorption and noise reduction are achieved. Moreover, the motor mount may provide enhanced stability to the motor assembly.

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

On the one hand, as the cutter shaft and the sealing bearing are made of hard rigid materials, the fit between the cutter shaft and the sealing bearing also belongs to small clearance fit. Therefore, when the coffee machine operates in bean grinding operation, the cutter shaft can smoothly rotate without leakage of liquid, and the sealing effect is achieved. On the other hand, the cutter shaft is sealed to encircle the sealing bearing, and liquid cannot leak outwards through the sealing bearing so as to play a role in sealing. In addition, the cutter shaft sealing ring is made of soft elastic materials and has a good shock absorbing function. Also because soft arbor sealing ring is firmly fixed on the bean grinding box by arbor sealing ring retainer plate, so the vibrations of arbor can not transmit to the bean grinding box, also can not cause the leakage.

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

More preferably, the elastic material is fumed silica or fluororubber.

Compared with the prior art, the invention has the beneficial effects that:

Drawings

Fig. 1 is a cross-sectional view of a transmission structure in one embodiment of the invention.

Fig. 2 is a schematic diagram of the fit clearance of a transmission structure in an embodiment of the invention.

Figure 3 is an exploded view of a soybean milling cutter assembly of a transmission structure in one embodiment of the present invention.

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

Fig. 5 is a schematic view of a clearance fit between a motor shaft of a transmission structure and a pin of a arbor assembly in an embodiment of the present invention.

Detailed Description

The transmission structure of the low noise and leakage-free coffee grinder of the present invention is further described below with reference to some embodiments. The present invention will be described in further detail with reference to specific examples, which are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that, if any, terms such as "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus the words describing the positional relationship in the drawings are merely for illustration and not to be construed as limiting the present patent.

As shown in fig. 1 to 5, the transmission structure of the low-noise and leak-free bean grinding coffee machine comprises a bean grinding box assembly 1, a bean grinding cutter assembly 2, a cutter shaft sealing ring fixing ring 3, a lower end cover 4 and a motor assembly 5.

The bean grinding cutter assembly 2 comprises a cutter shaft nut 21, a cutter blade 22, a cutter shaft sealing gasket 23, a cutter shaft sealing ring 24, a sealing bearing 25 and a cutter shaft assembly 26. The sealing bearing 25 is arranged on the cutter shaft assembly 26, the cutter shaft sealing ring 24 is sleeved at the outer end of the sealing bearing 25, the cutter shaft sealing ring 24 is fixed on the bean grinding box assembly 1 by the cutter shaft sealing ring fixing ring 3, and the cutter shaft sealing gasket 23 is arranged between the cutter blade 22 and the cutter shaft sealing ring 24. In addition, the lower end of the bean grinding cutter assembly 2 is provided with a lower end cover 4, and the lower end cover 4 is connected with the cutter shaft sealing ring fixing ring 3 through threads (such as a fixing screw 6) to fix the bean grinding box assembly 1.

The motor assembly 5 includes a spring pin 51, a motor shaft collar 52, a motor upper damper 53, a motor shaft 54, a motor body 55, a motor lower damper 56, a motor bracket 57, and screws 58. Because the arbor assembly 26 has an arbor hole, the arbor assembly 26 may be sleeved with the motor shaft 54 by a spring pin 51 extending through the motor shaft 54. When the motor is activated, the transmission of the motor shaft 54 torque is transferred to the arbor assembly 26 through the spring pins 51 and thereby rotates the blades on the arbor assembly 26. The motor upper damper block 53 is installed at the upper portion of the motor main body 55, the motor lower damper block 56 is installed at the lower portion of the motor main body 55, and the motor lower damper block 56 is installed between the motor main body 55 and the motor bracket 57.

The cutter shaft of the cutter shaft assembly 26 is in small clearance fit with the motor shaft 54, and the fit clearance is M; the outer side surface of the cutter shaft assembly 26 is in large clearance fit with the bean grinding box, and the clearance is K; when the arbor rotates, the maximum radial wobble 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 vapor phase silica gel.

Example 1

In this example, K is 0.9, M is 0.01, and N is 0.3, i.e., K > M+N.

When the coffee grinder was started, the noise generated during the grinding process was measured to be 70 db. The whole process of preparing coffee has no liquid leakage.

Example 2

In this example, K is 0.5, M is 0.1, and N is 0.3, i.e., K > M+N.

When the coffee grinder was started, the noise generated during grinding was measured to be 75 db. The whole process of preparing coffee has no liquid leakage.

Comparative example 1

In this comparative example, K is 0.2, M is 0.1, and N is 0.3, i.e., K < M+N.

When the coffee grinder was started, the noise generated during grinding was measured to be 80 db. The whole process of preparing coffee has no liquid leakage.

It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The utility model provides a grind beans coffee machine transmission structure, includes grinds beans box subassembly (1), grinds beans knife tackle spare (2), arbor sealing ring retainer plate (3), lower end cover (4) and motor tackle spare (5), lower end cover (4) are fixed in grinds beans box subassembly (1) with arbor sealing ring retainer plate (3);

wherein, the bean grinding knife assembly (2) is provided with a knife shaft assembly (26), and the knife shaft assembly (26) is provided with a knife shaft and a knife shaft hole; the motor assembly (5) is provided with a spring pin (51), a motor shaft (54) and a motor main body (55), and the cutter shaft assembly (26) is sleeved with the motor shaft (54) through the spring pin (51) penetrating through the motor shaft (54);

the device is characterized in that a fit clearance between a cutter shaft of a cutter shaft assembly (26) and a motor shaft (54) is M, a clearance between the outer side surface of the cutter shaft assembly (26) and a bean grinding box is K, and when the cutter shaft rotates, the maximum radial shaking amplitude of the outer side surface of the cutter shaft assembly (26) is N, so that K is more than M+N;

the bean grinding cutter assembly (2) further comprises a cutter blade (22), a cutter shaft sealing gasket (23), a cutter shaft sealing ring (24) and a sealing bearing (25), wherein the cutter shaft sealing gasket (23) is arranged between the cutter blade (22) and the cutter shaft sealing ring (24), the sealing bearing (25) is arranged on the cutter shaft assembly (26) and the outer end of the sealing bearing (25) is sleeved with the cutter shaft sealing ring (24), and the cutter shaft sealing ring (24) is fixed to the bean grinding box assembly (1) by the cutter shaft sealing ring fixing ring (3).

2. The transmission structure of a bean grinding coffee machine according to claim 1, characterized in that the motor assembly (5) is further provided with an upper motor damper block (53), a lower motor damper block (56) and a motor bracket (57), wherein the upper motor damper block (53) is mounted on the upper portion of the motor main body (55), the lower motor damper block (56) is mounted on the lower portion of the motor main body (55), and the lower motor damper block (56) is mounted between the motor main body (55) and the motor bracket (57).

3. A transmission structure of a coffee grinder according to claim 1, characterized in that the sealing bearing (25) and the arbor sealing ring (3) are made of rigid material, and the arbor sealing ring (24) is made of elastic material.

4. A coffee grinder transmission structure according to claim 3, characterized in that said rigid material is fluororubber with a stainless steel skeleton.

5. A transmission structure of a coffee grinder according to claim 3, wherein the elastic material is fumed silica or fluororubber.