Kitchen electric appliance

Abstract

The utility model relates to a kitchen electric appliance which comprises a cup body, a base, a motor and a knife assembly, the knife assembly comprises a blade part and a knife shaft part, and the motor drives the blade part to rotate; the cutter shaft piece comprises a cutter shaft body piece, a ceramic layer and a sealing piece, at least one groove body is formed in the side wall of the cutter shaft body piece in a sunken mode, the ceramic layer is correspondingly arranged in the groove body, and the outer side wall of the ceramic layer is flush with the outer side wall of the cutter shaft body piece or located in the groove body; the sealing piece is arranged on the cutter shaft body piece in a sleeving mode and provided with at least one sealing part, and the sealing parts abut against the ceramic layer in the rotating process of the cutter shaft piece so as to seal the space, located on the two sides of the sealing parts, of the cutter shaft body piece. The utility model has the following beneficial effects: under the condition of high rotating speed, a mode of interference fit between the ceramic layer and the sealing element is introduced, so that the ceramic sealing element has higher smoothness and is more wear-resistant, the wear is reduced, and the service life of kitchen electric appliances is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, in particular to a kitchen appliance. Background Art

[0002] With the continuous development of science and technology, kitchen appliances such as juicers, meat grinders, and food processors have gradually entered our kitchens, making daily cooking more convenient. As a type of food processor, the wall breaker has the advantages of multiple functions and multiple uses, gradually replacing traditional juicers and soymilk machines, and has become the largest category of small household appliances for squeezing food. However, as consumers pursue a higher quality of life, they have higher and higher requirements for the performance, noise, and life of the above-mentioned kitchen appliances.

[0003] The life of the knife seat assembly directly affects the service life of the wall breaker, and the most influential factors are the sealing structure and knife shaft structure inside the knife seat assembly. During operation, the high-speed rotation of the knife shaft will cause severe friction on the sealing ring in contact with it. Once damaged, the knife seat assembly will leak, which will lead to the end of its service life. Utility Model Content

[0004] Based on this, the utility model proposes a kitchen appliance, which introduces an interference fit between a ceramic layer and a seal under high rotation speed, has a higher finish and is more wear-resistant, thereby reducing wear and extending the service life of the kitchen appliance.

[0005] The utility model is realized by the following technical solutions:

[0006] A kitchen appliance, comprising:

[0007] Cup body;

[0008] A base, used for receiving the cup body;

[0009] A motor, disposed in the base;

[0010] A knife assembly, comprising a blade member and a knife shaft member;

[0011] The knife shaft member includes a knife shaft body member, a ceramic layer and a sealing member, and the first end of the knife shaft body member extends into the cup body and is used to install the blade member;

[0012] The sealing member is sleeved on the blade shaft body, and the sealing member has at least one sealing portion, and a ceramic layer is provided between the sealing portion and the blade shaft body;

[0013] The second end of the blade shaft body is pivotally connected to the output end of the motor so as to rotate around its own axis relative to the sealing member under the drive of the motor to drive the blade member to rotate synchronously;

[0014] The ceramic layer is arranged on the blade shaft body and abuts against the sealing part. The sealing part frictionally seals the ceramic layer during the rotation of the ceramic layer to seal the space where the blade shaft body is located on both sides of the sealing part.

[0015] In one embodiment, the ceramic layer completely circumferentially wraps around the side wall of the arbor body.

[0016] In one embodiment, a groove is recessed on the side wall of the blade shaft body, and the groove is an annular groove. The axis of the annular groove is coaxially arranged with the axis of the blade shaft body, and the sealing portion continuously abuts against the ceramic layer during the rotation of the blade shaft around its own axis, wherein the outer wall of the ceramic layer is flush with the outer wall of the blade shaft body in the radial direction, or is located in the groove.

[0017] In one embodiment, there are multiple ceramic layers, and the multiple ceramic layers are evenly distributed around the circumference on the side wall of the blade shaft body, wherein the outer wall of the ceramic layer is flush with the outer wall of the blade shaft body in the radial direction.

[0018] In one of the embodiments, a plurality of grooves are recessed on the side wall of the blade shaft body, and the ceramic layers are arranged in one-to-one correspondence with the grooves.

[0019] In one of the embodiments, a plurality of groups of grooves are disposed on the blade shaft body, and the plurality of groups of grooves are spaced apart along the axial direction of the blade shaft body, and the ceramic layer filled in each group of grooves corresponds to the sealing part.

[0020] In one embodiment, the blade shaft body is made of stainless steel, and the thickness of the ceramic layer in the radial direction is between 0.05-0.5 mm.

[0021] In one of the embodiments, the surface finish Ra of the ceramic layer is less than 0.05.

[0022] In one of the embodiments, the surface hardness of the ceramic layer is not less than HRC60.

[0023] In one of the embodiments, the abutting portion of the sealing portion is made of PTFE material.

[0024] In one of the embodiments, the axial extension region of the sealing portion falls within the axial extension region of the ceramic layer, and the ceramic layer extends at least 0.2 mm beyond the sealing portion in the axial direction.

[0025] In one of the embodiments, a gasket member is provided between the blade member and the sealing member, and the sealing member comprises a first sealing member and a second sealing member;

[0026] The first sealing member is provided with a first lip, and the first lip applies a pressing force to the gasket member in a direction away from the axis and obliquely upward to form a first seal with the blade shaft body member;

[0027] The second sealing member is provided with a second lip, and the sealing portion is provided at the second lip. An elastic member is annularly sleeved on the outer wall of the second lip. The elastic member applies a clamping force to the sealing portion in the radial direction, so that the sealing portion and the ceramic layer are interference fit to form a second seal for the knife shaft body.

[0028] In one embodiment, there is an interference seal between the first lip and the gasket, and the interference between the first lip and the gasket is 0.45-0.85 mm.

[0029] In one embodiment, the sealing portion is made of PTFE material.

[0030] In one of the embodiments, the second seal is further provided with a third lip, and the third lip applies a compressive force to the ceramic layer in the radial direction, so that the third lip and the ceramic layer are interference fit to form a third seal for the blade shaft body.

[0031] In one embodiment, the sealing portion at the second lip and the third lip are both interference fit with the ceramic layer, and the interference is 0.15-0.3 mm.

[0032] In one embodiment, the first sealing member comprises a first elastic layer, an outer side wall of the first elastic layer is provided with a first wave-shaped protrusion, and the outer side wall of the first elastic layer and the inner side wall of the second sealing member are interference-fitted to form a seal;

[0033] The first lip is arranged at the end of the first elastic layer away from the second sealing member;

[0034] The first sealing member further includes a first frame, and the first frame and the first elastic layer are integrally formed.

[0035] In one embodiment, the second sealing member comprises a second elastic layer, and a second wave-shaped protrusion is provided on an outer side wall of the second elastic layer;

[0036] The knife shaft component also includes a knife seat, the knife shaft body component is inserted into the knife seat, and the outer wall of the second elastic layer and the inner wall of the knife seat are interference-fitted to form a seal;

[0037] The second sealing member further includes a second frame, and the second frame is integrally formed with the second elastic layer.

[0038] In one of the embodiments, a sealed lubrication cavity is formed between the second lip, the third lip and the blade shaft body, and the lubrication cavity is filled with grease or lubricating oil.

[0039] In one embodiment, the output speed of the motor is 10000-25000 rpm.

[0040] The above-mentioned kitchen appliance is provided with a ceramic layer on the high-speed rotating blade shaft body. By controlling the parameter range of the ceramic layer such as the surface finish and the surface hardness, and cooperating with the interference seal of the seal, effective sealing of the blade shaft body can be achieved. In addition, the cooperation between the ceramic layer and the seal greatly reduces the wear of the seal relative to the original in the same time, thereby extending the service life of the kitchen appliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the kitchen appliance in the embodiment of the utility model;

[0042] Figure 2 for Figure 1 A cross-sectional view of a Chinese kitchen appliance;

[0043] Figure 3 It is a structural cross-sectional view of a knife shaft member of a kitchen appliance in an embodiment of the utility model;

[0044] Figure 4 It is a partial structural schematic diagram of a kitchen appliance in an embodiment of the utility model;

[0045] Figure 5 for Figure 4 A partial enlarged view of the cooperation between the blade shaft body and the seal at A in the middle;

[0046] Figure 6 for Figure 5 A partial enlarged view of the first seal at position B in the middle;

[0047] Figure 7 for Figure 5 A partial enlarged view of the second seal at position C in the middle;

[0048] Figure 8 It is a front view of a knife shaft body in one embodiment of the kitchen appliance in the embodiment of the utility model;

[0049] Fig. 9 It is a front view of a knife shaft body in another embodiment of the kitchen appliance in the embodiment of the utility model;

[0050] Reference numerals:

[0051] Cup body 100, base 200, motor 300, knife assembly 400, blade member 410, knife shaft member 420, knife shaft body member 4211, ceramic layer 4212, seal 4213, sealing part 4214, nut member 4215, gasket member 4216, corrugated gasket 4217, first seal 4218, second seal 4219, first elastic layer 4220, first skeleton 4221, first lip 4222, second elastic layer 4223, second skeleton 4224, second lip 4225, elastic member 4226, knife seat 4227, bearing member 4228, third lip 4229, lubrication cavity 4230. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0057] See also Figures 1 to 3 The kitchen appliance provided by an embodiment of the utility model includes a cup body 100, a base 200, a motor 300 and a knife assembly 400. The base 200 is located below the cup body 100 to receive the cup body 100, wherein the motor 300 is disposed in the base 200. The knife assembly 400 spans between the body and the base in the up-down direction to work under the drive of the motor 300. It is worth noting that the output speed of the motor 300 is 10000-25000rpm.

[0058] The knife assembly 400 includes a blade member 410 and a knife shaft member 420. The first end of the knife shaft member 420 extends upward into the cup body 100. The blade member 410 is located in the cup body 100 and is fixedly locked to the first end of the knife shaft member 420. The output end of the motor 300 is pivotally connected to the second end of the knife shaft member 420 to drive the knife shaft member 420 to rotate at a high speed around its own axis. The blade member 410 rotates synchronously with the knife shaft member to crush the object in the cup body 100.

[0059] The blade shaft member 420 includes a blade shaft body member 4211, a ceramic layer 4212 and a sealing member 4213. Specifically, the ceramic layer 4212 is disposed on the blade shaft body member, and the sealing member 4213 can abut against the blade shaft body member 4211, and the abutting portion is provided with the ceramic layer 4212. During the rotation process, the ceramic layer 4212 rotates synchronously with the blade shaft body member 4211, while the sealing member 4213 is fixed, and then the ceramic layer 4212 forms a friction seal with the sealing member 4213 during the rotation process, so as to achieve the axial sealing of the blade shaft body member 4211 on opposite sides of the abutting portion. Through the above-mentioned design, a ceramic layer 4212 is provided on the high-speed rotating blade shaft body 4211, and cooperates with the interference seal of the seal 4213 to achieve effective sealing of the blade shaft body 4211. In addition, the cooperation between the ceramic layer 4212 and the seal 4213 can greatly reduce the wear of the seal 4213 relative to the original optical axis within the same period of time, thereby extending the service life of the kitchen appliance.

[0060] In one embodiment, see Figure 1-4 , Figure 8 As shown, a groove body is formed on the side wall of the blade shaft body 4211, and the groove body is an annular groove body, and the ceramic layer 4212 is correspondingly arranged in the annular groove body. The axis of the annular groove body is coaxially arranged with the axis of the blade shaft body 4211, and the abutting part of the seal is continuously abutted with the ceramic layer 4212 during the rotation of the blade shaft body 4211. In particular, the outer wall of the ceramic layer 4212 is flush with the outer wall of the blade shaft body 4211 in the radial direction, or is located in the groove body. During high-speed rotation, the seal 4213 is always in continuous abutment with the ceramic layer 4212. On this basis, by adjusting the thickness of the ceramic layer 4212 in the radial direction, the interference between the ceramic layer 4212 and the seal 4213 can be adaptively adjusted. The specific manifestation is that the maximum thickness of the ceramic layer 4212 extending in the radial direction is flush with the side wall of the blade shaft body 4211.

[0061] Specifically, the seal 4213 is sleeved on the blade shaft body 4211, wherein the seal 4213 has at least one sealing portion 4214, and the sealing portion 4214 can be in interference contact with the ceramic layer 4212, so as to seal the space where the blade shaft body 4211 is located on both sides of the sealing portion 4214 in real time during the rotation of the blade shaft 420. Through the above-mentioned design scheme, a ceramic layer 4212 is provided on the blade shaft body 4211 rotating at a high speed, and the interference seal of the seal 4213 is matched by controlling the parameter range of the surface finish and surface hardness of the ceramic layer 4212 to achieve effective sealing of the blade shaft body 4211, and the ceramic layer 4212 and the seal 4213 cooperate to greatly reduce the wear of the seal 4213 relative to the original optical axis in the same time, thereby extending the service life of the kitchen appliance, and under normal use, the service life of the kitchen appliance exceeds 1000 hours.

[0062] In another embodiment, see Figure 1-4 , Fig. 9 As shown, the structure is the same as that in the above-mentioned embodiment, except that there are multiple ceramic layers 4212, and the multiple ceramic layers are evenly distributed around the circumference of the bearing body 4211. Correspondingly, a plurality of grooves are formed on the side wall of the blade shaft body 4211, and the ceramic layer 4212 is arranged in a one-to-one correspondence with the grooves. In particular, the outer wall of the ceramic layer 4212 is flush with the outer wall of the blade shaft body 4211 in the radial direction. During high-speed rotation, the side wall of the ceramic layer 4212 and the blade shaft body 4211 need to be located on the same circumferential surface, so as to ensure that the seal 4213 does not cause jumping during the friction process and always maintains good sealing.

[0063] The above design can solve the impact of temperature rise on sealing. Specifically, stainless steel is a metal material, and its thermal conductivity is about 5-8 times that of ceramics. Therefore, the blade shaft body 4211 has better thermal conductivity than the ceramic layer 4212. By adopting the above ceramic layer 4212 interval arrangement, during high-speed rotation, the heat generated by the abutting part of the seal 4213 can be better conducted away through the blade shaft body 4211, thereby ensuring that the temperature at the seal is always within the allowable range, thereby ensuring the stability of the seal and extending the service life of the kitchen appliance.

[0064] The sealing member 4213 has multiple sealing portions 4214 that can abut against the ceramic layer 4212. In view of the above structure, the blade shaft body 4211 in the present application is provided with multiple groups of grooves, and in particular, the multiple groups of grooves are arranged at intervals along the axial direction of the blade shaft body 4211, and the ceramic layer 4212 filled in each group of grooves can continuously abut against the sealing portion during operation, which not only plays a sealing role, but also effectively extends the service life of the electrical appliance.

[0065] See also Figure 2 During operation, the cup body 100 is horizontally placed on the base 200 so that the base 200 can stably and effectively carry the cup body 100. The axis of the motor 300 extends in the up-down direction, and the output end of the motor 300 is located at the upper end, which is used to pivotally connect the knife shaft 420. It is worth noting that the axis of the knife shaft 420 is colinearly arranged with the axis of the motor 300 to ensure stability and safety during high-speed rotation.

[0066] See also Figures 1 to 4 The blade shaft body 4211 is composed of multiple shaft sections with different diameters, and the multiple shaft sections with different diameters are integrally formed to ensure concentricity and self-strength at high speeds. The blade member 410 is sleeved on the blade shaft body 4211, and a nut member 4215 is arranged above the blade member 410 and a washer member 4216 is arranged below the blade member 410. During the installation process, the washer member 4216 is placed on the shaft shoulder and is limited in the up and down directions; the nut member 4215 is screwed into the thread opened on the blade shaft body 4211 to abut and lock the blade member 410. It is worth noting that a corrugated washer 4217 is arranged between the nut member 4215 and the blade member 410, which can solve the disadvantages of hard limiting in a vibration environment, and also effectively ensure that the axial movement of the blade member 410 is limited within the allowable range.

[0067] The diameter of the blade 410 in this embodiment is between 80-95 mm, and the blade 410 will generate radial load during high-speed rotation. In order to prevent foreign particles and liquid generated during operation from leaking along the blade shaft body 4211, a seal is designed to solve the above problem.

[0068] The seal 4213 is arranged below the gasket 4216, and the seal 4213 includes a first seal 4218 and a second seal 4219. The first seal 4218 abuts against the gasket 4216 in the axial direction, and forms a first seal on the blade shaft body 4211 in an interference fit manner, and the first seal at this location can effectively prevent foreign particles from entering the seal 4211. The sealing portion 4214 on the second seal 4219 abuts against the ceramic layer 4212, and forms a second seal on the blade shaft body 4211 in an interference fit manner. When the blade 410 rotates at a high speed to generate a large radial offset load, the first seal 4218 is subjected to high-speed impact for a long time, and some liquid may penetrate from the first seal 4218 to the second seal 4219, and at this time, the second seal 4219 can block the above-mentioned part of the liquid. A double-layer sealing system is formed by the cooperation of the first sealing member 4218 and the second sealing member 4219, so that the knife shaft member 420 can maintain a good sealing effect when subjected to radial offset load, and the service life of the kitchen appliance is extended.

[0069] Combination Figure 5-Figure 7 The first sealing member 4218 includes a first elastic layer 4220 and a first skeleton 4221, the first elastic layer 4220 and the first skeleton 4221 are integrally formed, and the first elastic layer 4220 is made of fluororubber material. A first lip 4222 is provided at the upper end of the first elastic layer 4220, and the first lip 4222 applies a resisting force to the gasket 4216 in a direction away from the axis and obliquely upward. The first lip 4222 gradually extends outward from bottom to top and is in a trumpet shape. The first lip 4222 and the gasket 4216 are interference sealed, and preferably, the interference between the first lip 4222 and the gasket 4216 is 0.45-0.85mm, so that when the knife shaft body 4211 swings during rotation, the first lip 4222 and the gasket 4216 can also maintain an interference fit, thereby improving the sealing stability at the first lip 4222.

[0070] Focus on reference Figure 6 , the outer wall of the first elastic layer 4220 and the inner wall of the second sealing member 4219 are interference fit to form a seal. Specifically, a first wave-shaped protrusion is provided on the outer wall of the first elastic layer 4220, and the inner wall of the second sealing member 4219 is interference fit with the first wave-shaped protrusion to form a seal. It is worth noting that the interference fit between the first lip 4222 and the gasket 4216, and the interference fit between the first wave-shaped protrusion and the second sealing member 4219 form a first seal.

[0071] The material of the first frame 4221 is SPCC, which is generally cold-rolled carbon steel sheet and steel strip. The first frame 4221 is an inverted "L"-shaped structure. The setting of the first frame 4221 can effectively improve the overall strength of the first sealing member 4218, and at the same time can keep the first sealing member 4218 in a relatively fixed shape.

[0072] Combination Figure 5-Figure 7 The second sealing member 4219 includes a second elastic layer 4223 and a second frame 4224, which are integrally formed with each other. Preferably, the second elastic layer 4223 is made of fluororubber. A second lip 4225 is provided on the second elastic layer 4223, and the second lip 4225 is interference-fitted with the ceramic layer 4212 and is located on a side close to the first lip 4222.

[0073] Among them, an elastic member 4226 is annularly sleeved on the outer wall of the second lip 4225, and preferably, the elastic member 4226 can be a spring. Through the above arrangement, the elastic member 4226 applies a compressive force to the second lip 4222 in the radial direction toward the blade shaft body 4211, so that the second lip 4225 and the ceramic layer 4212 are interference-fitted to form a second seal on the blade shaft body 4211. Specifically, a sealing portion 4214 is provided at the abutment between the second lip 4225 and the ceramic layer 4212, and the elastic member 4226 is arranged radially corresponding to the sealing portion 4214 to squeeze the sealing portion 4214 onto the blade shaft body 4211. The sealing portion 4214 in the present application is made of PTFE (polytetrafluoroethylene) material, which has the advantages of stable chemical properties, high temperature resistance, and low friction coefficient, and can effectively meet the high-speed working environment in the present application, thereby ensuring the high sealing performance of the kitchen appliance.

[0074] The sealing portion 4214 and the ceramic layer 4212 are interference fit, and the interference therebetween is 0.15-0.3 mm. During long-term use, the sealing portion 4214 will be worn. The above-mentioned interference fit method can compensate for the wear, so that the sealing portion 4214 and the ceramic layer 4212 always maintain an effective seal, thereby extending the service life of the kitchen appliance.

[0075] The outer wall of the second elastic layer 4223 is interference-fitted with the inner wall of the knife seat 4227 and forms a seal. Specifically, a second wave-shaped protrusion is provided on the outer wall of the second elastic layer 4223, and the outer wall of the second elastic layer 4223 is interference-fitted with the inner wall of the knife seat 4227. It is also worth noting that the upper end surface of the first elastic layer 4220 can abut against the inner wall of the knife seat 4227, and the lower end surface of the second elastic layer 4223 abuts against the bearing member 4228, which completes the upper limit of the seal 4213 in the axial direction, and also realizes a double seal between the seal 4213 and the knife seat 4227.

[0076] The second seal bearing member 4223 includes a second frame 4224. The material of the second frame 4224 is SPCC, that is, generally cold-rolled carbon steel sheet and steel strip. The second frame 4224 is an "L"-shaped structure. The second frame 4224 can effectively improve the overall strength of the second seal 4219 and keep the second seal 4219 in a relatively fixed shape.

[0077] It is worth noting that the second elastic layer 4223 is also provided with a third lip 4229, which is axially located on the side of the second lip 4225 away from the first lip 4222, and in a preferred embodiment, the third lip 4229 is also interference fit with the ceramic layer 4212. Specifically, the interference between the third lip 4229 and the ceramic layer 4212 is 0.15-0.3mm, and the above-mentioned setting enables the third lip 4229 to apply a pressing force to the ceramic layer 4212 in the radial direction, and on the basis of the first lip 4222 and the second lip 4225, a third seal is formed on the blade shaft body 4211.

[0078] It is worth noting that, in the axial direction, a sealed lubrication cavity 4230 is formed between the second lip 4228, the third lip 4229 and the blade shaft body 4211, and the lubrication cavity 4230 is filled with grease or lubricating oil. In the present application, grease is selected. Through the above-mentioned arrangement, the grease can lubricate the abutment position between the second lip 4225 and the third lip 4229 and the blade shaft body 4211, reduce the friction between the second seal 4219 and the blade shaft body 4211, and then reduce the wear of the second seal 4219 and extend its service life.

[0079] The blade shaft body 4211 is made of stainless steel, and its hardness and wear resistance are slightly worse than those of the ceramic layer 4212. Specifically, the thickness of the ceramic layer 4212 in the radial direction is between 0.05-0.5mm. The present application preferably uses a ceramic layer 4212 with a thickness of 0.2mm, which is applied to the blade shaft body 4211 of the present application. On the one hand, it can avoid the difficulty of processing due to being too thin, and on the other hand, it can avoid the cracking problem caused by being too thick. It is also worth noting that there are special requirements for the surface finish and surface hardness of the ceramic layer 4212. Specifically, the surface hardness of the ceramic layer 4212 is not less than HRC60, and the present application preferably uses a ceramic layer 4212 of HRC70. The surface finish Ra of the ceramic layer 4212 is less than 0.05. Through the above-mentioned arrangement, the ceramic layer 4212 has better surface finish and wear resistance, and thus during the long-term high-speed operation of the blade shaft body 4211, the seal 4213 has less wear than before, thereby meeting the sealing requirements and extending the service life of the kitchen appliance.

[0080] It is also worth noting that, based on the abutment between the sealing portion 4214 of the second lip 4225 and the ceramic layer 4212, the third lip 4229 can also abut against the ceramic layer 4212, so that the multiple sealing method effectively meets the sealing requirements of the blade shaft body 4211. The ceramic layer 4212 can be in a single group or multiple groups. Specifically, when a single group is used, the extension length of the ceramic layer 4212 on the axis is relatively long, and it must extend to the corresponding positions of the second lip 4225 and the third lip 4229; when multiple groups are used, preferably two groups can be used, and the extension length is relatively short, one of which is set corresponding to the second lip 4225, and the other is set corresponding to the third lip 4229, and there is a separation section of the blade shaft body between the two groups.

[0081] During high-speed rotation, due to the influence of factors such as eccentric load and vibration, the seal 4213 may be slightly deformed. The above deformation can be compensated by using an interference fit method. The distance between the ceramic layer 4212 and the second lip 4225 and the third lip 4229 is extended in the axial direction to compensate for the above deformation. Specifically, with the abutment between the second lip 4225 and the blade shaft body 4211 as the reference point, the ceramic layer 4212 extends along the axial direction on both sides relative to the reference point by no less than 0.2 mm.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A kitchen appliance, characterized in that: include: Cup body (100); A base (200) for receiving the cup body (100); A motor (300) is disposed in the base (200); A knife assembly (400) comprises a blade member (410) and a knife shaft member (420); The blade shaft component (420) comprises a blade shaft body component (4211), a ceramic layer (4212) and a sealing component (4213); the first end of the blade shaft body component (4211) extends into the cup body (100) and is used to install the blade component (410); The sealing member (4213) is sleeved on the blade shaft body member (4211), and the sealing member (4213) has at least one sealing portion (4214), and a ceramic layer (4212) is provided between the sealing portion (4214) and the blade shaft body member (4211); The second end of the blade shaft body (4211) is pivotally connected to the output end of the motor (300) so as to rotate around its own axis relative to the sealing member (4213) under the drive of the motor (300) to drive the blade member (410) to rotate synchronously; The ceramic layer (4212) is arranged on the blade shaft body (4211) and abuts against the sealing part (4214). The sealing part (4214) frictionally seals the ceramic layer (4212) during the rotation of the ceramic layer (4212) to seal the space where the blade shaft body (4211) is located on both sides of the sealing part (4214).

2. The kitchen appliance according to claim 1, characterized in that: The ceramic layer (4212) completely wraps around the side wall of the blade shaft body (4211).

3. The kitchen appliance according to claim 2, characterized in that: A groove is recessed on the side wall of the blade shaft body (4211), and the groove is an annular groove. The axis of the annular groove is coaxially arranged with the axis of the blade shaft body (4211). The sealing portion (4214) continuously abuts against the ceramic layer (4212) during the rotation of the blade shaft (420) around its own axis, wherein the outer side wall of the ceramic layer (4212) is flush with the outer side wall of the blade shaft body (4211) in the radial direction, or is located in the groove.

4. The kitchen appliance according to claim 1, characterized in that: The number of the ceramic layers (4212) is multiple, and the multiple ceramic layers (4212) are evenly distributed around the circumference on the side wall of the blade shaft body (4211), wherein the outer side wall of the ceramic layer (4212) is flush with the outer side wall of the blade shaft body (4211) in the radial direction.

5. The kitchen appliance according to claim 4, characterized in that: A plurality of grooves are recessed on the side wall of the blade shaft body (4211), and the ceramic layers (4212) are arranged in one-to-one correspondence with the grooves.

6. The kitchen appliance according to claim 1, characterized in that: The blade shaft body (4211) is provided with a plurality of groups of grooves, which are spaced apart along the axial direction of the blade shaft body (4211), and the ceramic layer (4212) filled in each group of grooves corresponds to the sealing part (4214).

7. The kitchen appliance according to claim 1, characterized in that: The blade shaft body (4211) is made of stainless steel, and the thickness of the ceramic layer (4212) in the radial direction is between 0.05-0.5 mm.

8. The kitchen appliance according to any one of claims 1 to 6, characterized in that: The surface finish Ra of the ceramic layer (4212) is less than 0.

05.

9. The kitchen appliance according to any one of claims 1 to 6, characterized in that: The surface hardness of the ceramic layer (4212) is not less than HRC60.

10. The kitchen appliance according to claim 1, characterized in that: The abutting portion of the sealing portion (4214) is made of PTFE material.

11. The kitchen appliance according to claim 1, characterized in that: The axial extension region of the sealing portion (4214) falls within the axial extension region of the ceramic layer (4212), and the ceramic layer (4212) extends at least 0.2 mm axially relative to the sealing portion (4214).

12. The kitchen appliance according to claim 1, characterized in that: A gasket (4216) is provided between the blade member (410) and the sealing member (4213), and the sealing member comprises a first sealing member (4218) and a second sealing member (4219); The first sealing member (4218) is provided with a first lip (4222), and the first lip (4222) applies a pressing force to the gasket member (4216) in a direction away from the axis and obliquely upward, so as to form a first seal with the blade shaft body member (4211); The second sealing member (4219) is provided with a second lip (4225), and the sealing portion (4214) is provided at the second lip (4225). An elastic member (4226) is annularly sleeved on the outer wall of the second lip (4225), and the elastic member (4226) applies a clamping force to the sealing portion (4214) in the radial direction, so that the sealing portion (4214) and the ceramic layer (4212) are interference fit to form a second seal for the knife shaft body (4211).

13. The kitchen appliance according to claim 12, characterized in that: An interference seal is formed between the first lip (4222) and the gasket (4216), and the interference between the first lip (4222) and the gasket (4216) is 0.45-0.85 mm.

14. The kitchen appliance according to claim 12, characterized in that: The sealing portion (4214) is made of PTFE material.

15. The kitchen appliance according to claim 12, characterized in that: The second seal (4219) is also provided with a third lip (4229), and the third lip (4229) applies a pressing force to the ceramic layer (4212) in the radial direction, so that the third lip (4229) and the ceramic layer (4212) are interference fit to form a third seal for the knife shaft body (4211).

16. The kitchen appliance according to claim 15, characterized in that: The sealing portion (4214) at the second lip (4225) and the third lip (4229) are both interference fit with the ceramic layer (4212), and the interference amount is 0.15-0.3 mm.

17. The kitchen appliance according to claim 12, characterized in that: The first sealing member (4218) comprises a first elastic layer (4220), an outer side wall of the first elastic layer (4220) is provided with a first wave-shaped protrusion, and the outer side wall of the first elastic layer (4220) and the inner side wall of the second sealing member (4219) are interference-fitted to form a seal; The first lip (4222) is arranged at an end of the first elastic layer (4220) away from the second sealing member (4219); The first sealing member (4218) further includes a first skeleton (4221), and the first skeleton (4221) and the first elastic layer (4220) are integrally formed.

18. The kitchen appliance according to claim 12, characterized in that: The second sealing member (4219) comprises a second elastic layer (4223), and a second wave-shaped protrusion is arranged on the outer side wall of the second elastic layer (4223); The knife shaft component (420) further comprises a knife seat (4227), the knife shaft body component (4211) is inserted into the knife seat (4227), and the outer wall of the second elastic layer (4223) and the inner wall of the knife seat (4227) are interference-fitted to form a seal; The second sealing member (4219) further includes a second frame (4224), and the second frame (4224) and the second elastic layer (4223) are integrally formed.

19. The kitchen appliance according to claim 15, characterized in that: A sealed lubrication cavity (4230) is formed between the second lip (4225), the third lip (4229) and the blade shaft body (4211), and the lubrication cavity (4230) is filled with lubricating grease or lubricating oil.

20. The kitchen appliance according to claim 1, characterized in that: The output rotation speed of the motor (300) is 10000-25000 rpm.

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