WO2021027653A1

WO2021027653A1 - A food processor

Info

Publication number: WO2021027653A1
Application number: PCT/CN2020/107104
Authority: WO
Inventors: Yingjun CHEN; Lumeng TANG
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-08-12
Filing date: 2020-08-05
Publication date: 2021-02-18
Anticipated expiration: 2022-02-12
Also published as: CN110859533A; EP4013274A4; CN110859533B; EP4013274A1; KR20220042463A

Abstract

A food processor comprises: a bowl (120) comprising a food material accommodating chamber (120a); a bowl cover (122) capable of covering the bowl (120), the top of which is provided with a through hole (122a); a flow disturbing mechanism (13) comprising a flow disturbing casing (130) provided inside the food material accommodating chamber (120a) and an adjusting screw (132) used for adjusting the height of the flow disturbing casing (130), the adjusting screw (132) being inserted into the food material accommodating chamber (120a) via the through hole (122a) and drivingly connected with the flow disturbing casing (130) by means of a thread (130a). By adjusting the height of the flow disturbing casing (130), the volume of the flow disturbing space inside the bowl (120) can be adjusted so as to adapt to the requirements for crushing and stirring food materials of different volumes.

Description

A Food Processor

Field of the Invention

The invention relates to the technical field of electrical home appliances, and relates in particular to a food processor.

Background of the Invention

Generally, existing food processors such as blenders are provided with a flow disturbing mechanism inside a bowl. By providing such a flow disturbing mechanism, flow disturbing and crushing can be achieved in a small space so that a food material can be crushed in a finer way.

However, in practice, since food materials have different volumes, the same flow disturbing space cannot ensure the best crushing effect for food materials of different volumes.

Summary of the Invention

The invention provides a food processor capable of adjusting the volume of a flow disturbing space so as to improve the crushing or stirring effect of a food material.

Specifically, the invention is realized by the following technical solutions:

A food processor comprises:

- a bowl comprising a food material accommodating chamber;

- a bowl cover capable of covering the bowl, the top of which is provided with a through hole;

- a flow disturbing mechanism comprising a flow disturbing casing provided inside the food material accommodating chamber and an adjusting screw used for adjusting the height of the flow disturbing casing, the adjusting screw being inserted into the food material accommodating chamber via the through hole and drivingly connected with the flow disturbing casing by means of a thread. A space below the flow disturbing casing is a flow disturbing space. By adjusting the height of the flow disturbing casing, the volume of the flow disturbing space inside the bowl can be adjusted so as to adapt to the requirements for crushing and stirring food materials of different volumes.

Optionally, the adjusting screw comprises a flow disturbing plate provided at a bottom end. The flow disturbing plate can perform the functions of flow disturbing and bubble breaking, which facilitates the stirring and crushing of a food material.

Optionally, the flow disturbing casing comprises a cavity for the adjusting screw to pass through, and the flow disturbing casing comprises a flow disturbing rib and/or flow guiding rib protruding from an inner wall of the cavity, a space below the flow guiding rib being a flow disturbing space, the flow disturbing rib being used for stirring a food material inside the flow disturbing space, the flow guiding rib being used for guiding a spilled food material to flow back into the flow disturbing space.

Optionally, the food processor comprises a guiding part along which the flow disturbing casing moves up and down when driven by the adjusting screw. The guiding part can ensure that the flow disturbing casing moves up and down smoothly and reduce the deviation in the course of moving up and down.

Optionally, the guiding part comprises an elongated rib and an elongated groove, one of the flow disturbing casing and the bowl comprising the elongated rib while the other comprises the elongated groove, the elongated rib sliding inside the elongated groove during the course of moving up and down of the flow disturbing casing. The guiding part is of a simple structure and convenient to realize. In addition, the cooperation between the elongated rib and the elongated groove can also prevent the flow disturbing casing from following the rotation of the adjusting screw and thus serves as a circumferential positioning structure at the same time.

Optionally, the food processor further comprises a limiting mechanism used for limiting the amount of movement of the adjusting screw in the height direction of the bowl. By providing the limiting mechanism, the flow disturbing mechanism can be prevented from deviating from its position during operation, improving a user’s experience.

Optionally, the limiting mechanism comprises a hollow shaft sleeved to the adjusting screw, the hollow shaft being maintained fixed relative to the adjusting screw in the height direction of the bowl, the hollow shaft being provided inside the through hole and interference fitted with the through hole. The hollow shaft is of a simple structure, making it more convenient to mounting it with the adjusting screw.

Optionally, the hollow shaft comprises an annular shaft body and a protruding rib protruding from an outer wall of the annular shaft body, the hollow shaft being interference fitted with the through hole by means of the protruding rib inside the through hole. This solution can reduce the contact area when the hollow shaft is interference fitted with the through hole, which ensures the amount of interference while avoiding interfering with the rotation of the adjusting screw.

Optionally, the protruding rib comprises an inclined guiding face along which the hollow shaft is inserted into the through hole. The inclined guiding face can reduce the amount of interference between the hollow shaft and the through hole during an initial phase of mounting, reducing the difficulty of mounting when the hollow shaft is mounted into the through hole.

Optionally, the amount of interference between the hollow shaft and the through hole is W1, wherein 0.2mm < W1 < 1mm. This amount of interference is appropriate since it can perform the function of limiting the position of the adjusting screw in the height direction of the bowl, without obstructing the rotation of the screwing screw.

Optionally, a venting gap for venting gas inside the food material accommodating chamber is left between the annular shaft body and an inner wall of the through hole. The venting gap can prevent the pressure inside the food material accommodating chamber from being excessive.

Optionally, the dimension of the venting gap is W2, wherein 0.5mm < W2 < 1.5mm. The size of the venting gap is appropriate since it can meet the requirement of releasing the pressure inside the food material accommodating chamber.

Optionally, one of the hollow shaft and the adjusting screw comprises a flange extending radially while the other comprises a groove, the flange being inserted inside the groove so as to be maintained fixed in the height direction of the bowl. This fixation is simple and reliable.

Optionally, the hollow shaft is made of an elastic material. An elastic material has the property of being deformable. Therefore, in terms of manufacturing, the manufacturing precision of the hollow shaft can be reduced. In terms of cooperation, the amount of movement of the adjusting screw can be reduced by its elastic force, while the rotation of the adjusting screw can be allowed by its elastic deformation.

Optionally, the limiting mechanism comprises a magnetic part by means of which the adjusting screw cooperates with the bowl cover by attraction. The magnetic part maintains the adjusting screw to be fixed relative to the bowl cover by means of a magnetic attraction force so that the wearing between the adjusting screw and the bowl cover is little and the effect of the attraction force is more long lasting.

Optionally, the magnetic part comprises a permanent magnet and a magnetically permeable material, one of the adjusting screw and the bowl cover comprising the permanent magnet while the other comprises the magnetically permeable material, the permanent magnet and the magnetically permeable material cooperating with each other by attraction; or,

the magnetic part comprises a first permanent magnet provided at the adjusting screw and a second permanent magnet provided at the bowl cover, the first permanent magnet and the second permanent magnet cooperating with each other by attraction.

The technical solutions provided by the invention can achieve the following beneficial results:

The invention provides a food processor comprising a flow disturbing mechanism which comprises a flow disturbing casing and an adjusting screw used for adjusting the height of the flow disturbing casing, the adjusting screw being drivingly connected with the flow disturbing casing by means of a thread. By adjusting the height of the flow disturbing casing, the volume of the flow disturbing space inside the bowl can be adjusted so as to adapt to the requirements for crushing and stirring food materials of different volumes.

Description of the Drawings

Figure 1 is a schematic view of a food processor of the invention illustrated by an exemplary embodiment;

Figure 2 is an exploded view of a partial structure of a food processor of the invention illustrated by an exemplary embodiment;

Figure 3 is a sectional view of a bowl assembly of a food processor of the invention illustrated by an exemplary embodiment;

Figure 4 is a sectional view of a flow disturbing casing of the invention illustrated by an exemplary embodiment;

Figure 5 is a sectional view of a bowl of the invention illustrated by an exemplary embodiment;

Figure 6 is a schematic view of an adjusting screw of the invention illustrated by an exemplary embodiment;

Figure 7 is an enlarged view of the detail A in Figure 3;

Figure 8 is a sectional view of another embodiment of a food processor of the invention illustrated by an exemplary embodiment;

Figure 9 is another exploded view of a partial structure of a food processor of the invention illustrated by an exemplary embodiment;

Figure 10 is another sectional view of a bowl assembly of a food processor of the invention illustrated by an exemplary embodiment;

Figure 11 is an enlarged view of the detail B in Figure 10.

Detailed Description of the Invention

Exemplary embodiments, which are illustrated in the accompanying drawings, will be described in detail here. In the description below related to figures, unless otherwise indicated, the same numbers in different figures refer to the same or similar elements. The modes of realization described in the following exemplary embodiments do not represent all modes of realization in accordance with the invention. Instead, they are merely examples of devices and methods in accordance with some aspects of the invention described in detail in the appended claims.

The terms used in the application are merely for the purpose of describing specific embodiments, and not intended to be limiting. Unless otherwise defined, the technical terms or scientific terms used in the description shall have their common meanings as understood by a person of ordinary skills in the art to which the invention belongs. Terms such as “first, ” “second, ” and the like used in the description and the claims of the application do not represent any order, quantity, or importance but instead are used to distinguish different components. Similarly, terms such as “one” or “a (n) ” and the like do not represent a numerical limitation but mean that there exists at least one. “A plurality” or “several” means two or more than two. Unless otherwise specified, terms such as “front, ” “back, ” “lower” and/or “upper, ” “top, ” “bottom, ” and the like are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Terms such as “comprise” or “include” and the like are intended to mean that the element or object that appears before “comprise” or “include” includes the element or object that appears after “comprise” or “include” or its equivalent, and do not exclude other elements or objects. Terms such as “connect” or “connected” and the like are not limited to a physical or mechanical connection, but can include an electrical connection, whether direct or indirect.

Now refer to Figure 1 which shows a schematic view of a food processor illustrated by an exemplary embodiment of the invention.

Embodiments of the invention provide a food processor 10 comprising a main unit 11 and a bowl assembly 12 detachably assembled to the main unit 11.

The bowl assembly 12 comprises a bowl 120 and a bowl cover 122 capable of covering the bowl 120. In an example, the bowl cover 122 can be mounted to the bowl 120 by rotation and locked relative to the bowl 120 by a snap-fit structure 124 at the end of the rotation course. Of course, the fixation of the bowl cover 122 to the bowl 120 is not limited to only this way.

Now refer to Figure 2 and Figure 3, wherein Figure 2 shows an exploded view of a partial structure of a food processor illustrated by an exemplary embodiment of the invention; Figure 3 shows a sectional view of a bowl assembly of a food processor illustrated by an exemplary embodiment of the invention;

A sealing ring 126 may be provided between the bowl 120 and the bowl cover 122. The sealing ring 126 is mounted inside a mounting slot 122b located at a lower end of the bowl cover 122.

The bowl assembly 12 further comprises a flow disturbing mechanism 13 comprising a flow disturbing casing 130 and an adjusting screw 132 used for adjusting the height of the flow disturbing casing 130. Specifically, the bowl 120 comprises a food material accommodating chamber 120a inside which the flow disturbing casing 130 is provided. The bowl cover 122 is provided with a through hole 122a through which the adjusting screw 132 is inserted into the food material accommodating chamber 120a of the bowl 120. The flow disturbing casing 130 is movably provided on the adjusting screw 132. The flow disturbing casing 130 comprises an inner thread 130a and the adjusting screw 132 comprises an outer thread 132a. The inner thread 130a of the flow disturbing casing 130 and the outer thread 132a of the adjusting screw 132 are drivingly connected.

When the adjusting screw 132 is rotated in different directions, it can drive the flow disturbing casing 130 to move up or down along an inner wall of the bowl 120. By adjusting the height of the flow disturbing casing 130, the volume of a flow disturbing space inside the bowl 120 can be adjusted, so as to adapt to the requirements for crushing and stirring food materials of different volumes. The flow disturbing space is located below the flow disturbing casing 130.

The food processor 10 can further comprise a guiding part. The flow disturbing casing 130, when driven by the adjusting screw 132, moves up and down along the guiding part, so as to prevent the flow disturbing casing 130 from deviating during the course of moving up and down. In an example, the guiding part can comprise an elongated rib and an elongated groove.

In the present example, in reference to Figures 2 to 5, the bowl 120 comprises an elongated rib 120b protruding from its inner wall, and the flow disturbing casing 130 comprises an elongated groove 130b concavely provided at its outer wall. The elongated rib 120b slides in the elongated groove 130b during the course of moving up and down of the flow disturbing casing 130. A plurality of, respectively, elongated ribs 120b and elongated grooves 130b can be provided and correspond to each other one by one. Of course, it is also possible that the flow disturbing casing 130 comprises an elongated rib and the bowl 120 comprises an elongated groove.

In addition, when the adjusting screw 132 is rotated, the cooperation between the elongated rib 120b and the elongated groove 130b can perform the function of circumferential position limiting so as to prevent the flow disturbing casing 130 from rotating together with the adjusting screw 132, so that the flow disturbing casing 130 can only move up and down in the axial direction of the adjusting screw 132.

The flow disturbing casing 130 is of a hollow structure, with the hollow portion serving as a cavity for the adjusting screw 132 to pass through. As shown in Figure 2, the flow disturbing casing 130 comprises a first cylindrical section 1300 and a second cylindrical section 1302 provided at two ends and an arcuate section 1304 connecting the first cylindrical section 1300 and the second cylindrical section 1302. In the example, the inner thread 130a is provided at an inner wall of the first cylindrical section 1300, and the elongated groove 130b is provide at an outer wall of the second cylindrical section 1302. The arcuate section 1304 is provided with a food material backflow hole 1304a through which a food material spilled out of the flow disturbing casing 130 can flow back into the flow disturbing space during the course of stirring and crushing. The arcuate section 1304 is in the shape of a concave arc and thus its profile can facilitate the backflow of the food material.

In reference to Figure 3 and Figure 4, the flow disturbing casing 130 further comprises a flow guiding rib provided at an inner wall of the cavity. In an example, the flow guiding rib is provided as an annular part 1306 extending from the inner wall of the second cylindrical section 1302 towards the hollow portion. A terminal end of the annular part 1306 extends downwards towards the bottom of the bowl 120. A gap is reserved between the terminal end and the adjusting screw 132. The annular part 1306 can prevent a food material from being spilled out from inside the flow disturbing space on one hand, and can also guide a food material flowing back from the food material backflow hole 1304a into the flow disturbing space on the other hand. More specifically, the flow disturbing space is the space below the flow guiding rib.

The flow disturbing casing 130 further comprises a flow disturbing rib 1308 provided at the inner wall of the cavity and protruding from the inner wall of the flow disturbing casing 130. In the present example, the flow disturbing rib 1308 and the elongated groove 130b are respectively provided on the inner wall and the outer wall at the same location. The flow disturbing rib 1308 can perform the function of disturbing a food material inside the flow disturbing space on one hand, and can also be used to compensate for the strength loss at the location of the elongated groove 130b on the other hand, so that the wall thickness of the flow disturbing casing 130 at the elongated groove 130b remains relatively unchanged.

In reference to Figure 5, the bowl 120 further comprises a bowl flow disturbing rib 120c provided inside it. The bowl flow disturbing rib 120c is provided at the bottom of the bowl 120, protruding from the inner wall of the bowl 120, and is located inside the flow disturbing space.

In reference to Figure 2, Figure 3, and Figure 6, the adjusting screw 132 further comprises a holding part 132b and an annular flange 132c. When adjusting the height of the flow disturbing casing 130, a user can apply a torque at the holding part 132b to turn the adjusting screw 132. The annular flange 132c overlaps with an outer edge of the through hole 122a. A bottom end of the adjusting screw 132 is provided with a flow disturbing plate 132d. In an example, the flow disturbing plate 132d is cross-shaped, directly facing the blade assembly inside the bowl 120, and is capable of performing the function of flow disturbing and bubble breaking in the course of stirring and crushing a food material.

The bowl assembly 12 further comprises a limiting mechanism used for limiting the amount of movement of the adjusting screw 132 in the height direction of the bowl 120, preventing the flow disturbing mechanism 13 from deviating from its position during the operation of the food processor 10.

In an example, as shown in Figure 2 and Figure 3, the limiting mechanism comprises a hollow shaft 14 sleeved on the adjusting screw 132 and maintained fixed relative to the adjusting screw 132 in the height direction of the bowl 120.

The hollow shaft 14 is provided inside the through hole 122a and interference fitted with the through hole 122a. In other words, the hollow shaft 14 is pressed and fixed between the adjusting screw 132 and the bowl cover 122, so as to limit the amount of movement of the adjusting screw 132 along the height direction of the bowl 120. In this example, the hollow shaft 14 is of a simple structure, making it more convenient to mounting it with the adjusting screw 132.

The fixation of the hollow shaft 14 to the adjusting screw 132 is not limited. For example, the two can be fixed by gluing. In the present example, the hollow shaft 14 comprises a flange 14a extending radially towards the hollow portion, and the adjusting screw 132 comprises a groove 132e (see Figure 6) provided at its outer wall. The flange 14a is inserted inside the groove 132e so as to maintain the hollow shaft 14 to be fixed relative to the adjusting screw 132 in the height direction of the bowl 120. This way of fixing is simple and reliable.

When the height of the flow disturbing casing 130 is to be adjusted, the adjusting screw 132 needs to be turned. In order to avoid the amount of interference between the hollow shaft 14 and the through hole 122a being too large to turn the adjusting screw, the hollow shaft 14 provided by the invention comprises an annular shaft body 140 and a protruding rib 142 protruding from an outer wall of the annular shaft body 140. In the through hole 122a, the hollow shaft 14 is interference fitted with the through hole 122a by means of the protruding rib 142. This solution can reduce the area of contact when the hollow shaft 14 is interference fitted with the through hole 122a, which ensures the amount of interference while avoiding interfering with the rotation of the adjusting screw 132. In the present example, a plurality of ribs 142 are arranged at intervals on the circumferential face of the annular shaft body 140.

In an optional example, in reference to Figure 7, the amount of interference between the hollow shaft 14 and the through hole 122a is W1, wherein 0.2mm < W1 < 1mm. Within this range, the function of limiting the position of the adjusting screw 132 in the height direction of the bowl 120 can be ensured without obstructing the rotation of the screwing screw 132. In a specific example, W1 may be chosen to be 0.5 mm.

It can be easily understood that, when the hollow shaft 14 is inserted into the through hole 122a, the protruding rib 142 will cause an increased difficulty of mounting. Given that, the protruding rib 142 comprises an inclined guiding face 142a along which the hollow shaft 14 is inserted into the through hole 122a. Thus, at the inclined guiding face 142a, the amount of interference between the hollow shaft 14 and the through hole 122a during an initial phase of mounting can be reduced, thereby reducing the difficulty of mounting the hollow shaft 14.

In addition, a venting gap for venting gas inside the food material accommodating chamber 120a is left between the annular shaft body 140 and an inner wall of the through hole 122a. The venting gap can prevent the pressure inside the food material accommodating chamber 120a from being excessive. In the present example, the venting gap is the gap between the outer wall of the annular shaft body 140 and the inner wall of the through hole 122a.

In an optional example, the dimension of the venting gap is W2, wherein 0.5mm < W2 <1.5mm. The dimension of the venting gap can meet the requirement for releasing the pressure inside the food material accommodating chamber 120a. In a specific example, W2 may be chosen to be 1 mm.

In reference to Figure 6, the annular flange 132c further comprises a plot 132f which rests on the bowl cover 122. Thus, a gap is left between a lower surface of the annular flange 132c and the bowl cover 122. This gap is in communication with the venting gap so as to ensure that gas inside the food material accommodating chamber 120a is successfully vented out.

In the various embodiments described above, the hollow shaft 14 can be made of an elastic material. Because an elastic material has the property of being deformable, in terms of manufacturing, the manufacturing precision of the hollow shaft 14 can be reduced. In terms of cooperation, the amount of movement of the adjusting screw 132 can be reduced by an elastic force, and the rotation of the adjusting screw 132 can be ensured by elastic deformation.

Even though embodiments in which the hollow shaft 14 is used as the limiting mechanism are described in detail above, the limiting mechanism is not only limited to the structures shown above.

In reference to Figure 8, the limiting mechanism may comprise a magnetic part 150 by means of which the adjusting screw 120 cooperates with the bowl cover 122 by attraction so as to limit the amount of movement of the adjusting screw 132 in the height direction of the bowl 120. The magnetic part maintains the adjusting screw 132 to be fixed relative to the bowl cover 122 by means of a magnetic attraction force so that the wearing between the adjusting screw 132 and the bowl cover 122 is little and the effect of the attraction force is more long lasting.

Specifically, the magnetic part 150 can comprise a permanent magnet 150a and a magnetically permeable material 150b. For example, the adjusting screw 132 comprises the permanent magnet 150a and the bowl cover 122 comprises the magnetically permeable material 150b. The permanent magnet 150a magnetizes the magnetically permeable material 150b and cooperates with it by attraction when the adjusting screw 132 is mounted to the bowl cover 122.

Or, the adjusting screw 132 comprises the magnetically permeable material 150b and the bowl cover 122 comprises the permanent magnet 150a. The permanent magnet 150a cooperates with the magnetically permeable material 150b by attraction.

In some other embodiments, the magnetic part 150 can comprise a first permanent magnet and a second permanent magnet, wherein, the first permanent magnet is provided on the adjusting screw 132 and the second permanent magnet is provided on the bowl cover 122. The first permanent magnet and the second permanent magnet cooperate with each other by attraction when the adjusting screw 132 is mounted to the bowl cover 122.

Elongated magnets can be used as the first permanent magnet and the second permanent magnet. The ends of the first permanent magnet and the second permanent magnet that have the opposite polarities are provided to face each other.

The flow disturbing mechanism 13 in the invention can easily achieve the adjustment of the position of the flow disturbing casing 130 in the height direction by turning the adjusting screw 132, so as to be able to crush and stir food materials of different volumes. Thus the processed food material is finer and tastes better.

In reference to Figure 9 to Figure 11, the food processor 10 may further comprise an O-ring 20, which, together with the annular flange 132c at the upper end of the adjusting screw 132, can constitute another embodiment of the limiting mechanism used for limiting the amount of movement of the adjusting screw 132 in the height direction of the bowl 120.

What have been described above are merely preferred embodiments of the invention, and not for the purpose of limiting the invention. Any modification, equivalent replacement or improvement made within the spirit and principles of the invention falls within the protection scope of the application.

Claims

A food processor, characterized in that it comprises:

- a bowl (120) comprising a food material accommodating chamber (120a) ;

- a bowl cover (122) capable of covering the bowl (120) , the top of which being provided with a through hole (122a) ;

- a flow disturbing mechanism (13) comprising a flow disturbing casing (130) provided inside the food material accommodating chamber (120a) and an adjusting screw (132) used for adjusting the height of the flow disturbing casing (130) , the adjusting screw (132) being inserted into the food material accommodating chamber (120a) via the through hole (122a) and drivingly connected with the flow disturbing casing (130) by means of a thread.
The food processor according to claim 1, characterized in that a space below the flow disturbing casing (130) is a flow disturbing space.
The food processor according to claim 2, characterized in that the flow disturbing casing (130) comprises a cavity for the adjusting screw (132) to pass through, and the flow disturbing casing (130) comprises a flow disturbing rib (1308) and/or flow guiding rib protruding from an inner wall of the cavity, a space below the flow guiding rib being the flow disturbing space, the flow disturbing rib (1308) being used for stirring the food material inside the flow disturbing space, the flow guiding rib being used for guiding a spilled food material to flow back into the flow disturbing space.
The food processor according to any one of claims 1 to 3, characterized in that the adjusting screw (132) comprises a flow disturbing plate (132d) provided at a bottom end.
The food processor according to any one of claims 1 to 4, characterized in that the food processor comprises a guiding part along which the flow disturbing casing (130) moves up and down when driven by the adjusting screw (132) .
The food processor according to claim 5, characterized in that the guiding part comprises an elongated rib (120b) and an elongated groove (130b) , one of the flow disturbing casing (130) and the bowl (120) comprising the elongated rib (120b) while the other comprises the elongated groove (130b) , the elongated rib (120b) sliding inside the elongated groove (130b) during the course of moving up and down of the flow disturbing casing (130) .
The food processor according to any one of claims 1 to 6, characterized in that the food processor (10) further comprises a limiting mechanism used for limiting the amount of movement of the adjusting screw (132) in the height direction of the bowl (120) .
The food processor according to claim 7, characterized in that the limiting mechanism comprises a hollow shaft (14) sleeved to the adjusting screw (132) , the hollow shaft (14) being maintained fixed relative to the adjusting screw (132) in the height direction of the bowl (120) , the hollow shaft (14) being provided inside the through hole (122a) and interference fitted with the through hole (122a) .
The food processor according to claim 8, characterized in that the amount of interference between the hollow shaft (14) and the through hole (122a) is W1, wherein 0.2mm < W1 < 1 mm.
The food processor according to claim 8 or 9, characterized in that the hollow shaft (14) comprises an annular shaft body (140) and a protruding rib (142) protruding from an outer wall of the annular shaft body (140) , the hollow shaft (14) being interference fitted with the through hole (122a) by means of the protruding rib (142) inside the through hole (122a) .
The food processor according to claim 10, characterized in that the protruding rib (142) comprises an inclined guiding face (142a) along which the hollow shaft (14) is inserted into the through hole (122a) .
The food processor according to claim 10 or 11, characterized in that a venting gap for venting gas inside the food material accommodating chamber (120a) is left between the annular shaft body (140) and an inner wall of the through hole (122a) .
The food processor according to claim 12, characterized in that the dimension of the venting gap is W2, wherein 0.5mm < W2 < 1.5mm.
The food processor according to any one of claims 8 to 13, characterized in that one of the hollow shaft (14) and the adjusting screw (132) comprises a flange (14a) extending radially while the other comprises a groove (132e) , the flange (14a) being inserted inside the groove (132e) so as to be maintained fixed in the height direction of the bowl (120) .
The food processor according to any one of claims 8 to 14, characterized in that the hollow shaft (14) is made of an elastic material.
The food processor according to claim 7, characterized in that the limiting mechanism comprises a magnetic part (150) by means of which the adjusting screw (132) cooperates with the bowl cover (122) by attraction.
The food processor according to claim 16, characterized in that the magnetic part (150) comprises a permanent magnet (150a) and a magnetically permeable material (150b) , one of the adjusting screw (132) and the bowl cover (122) comprising the permanent magnet while the other comprises the magnetically permeable material, the permanent magnet (150a) and the magnetically permeable material (150b) cooperating with each other by attraction; or,

the magnetic part (150) comprises a first permanent magnet provided at the adjusting screw (132) and a second permanent magnet provided at the bowl cover (122) , the first permanent magnet and the second permanent magnet cooperating with each other by attraction.