CN109965666B - Cooking utensil - Google Patents

Abstract

The invention discloses a cooking appliance, which comprises a base body (200) and a cover body (100), wherein the cover body is pivotally arranged on the base body in an openable manner, a pivotal connection part between the base body and the cover body is provided with a pivotal spring (1), and the far ends of the base body and the cover body, which are opposite to the pivotal connection part, are provided with magnetic attraction locking components for magnetically opening and closing the cover. The magnetic attraction locking assembly preferably comprises a magnet (3) and an electromagnet loop with an iron core rod (4), one of the magnet and the electromagnet loop is arranged at the far end of the base body, the other one of the magnet and the electromagnet loop is arranged at the far end of the cover body, and the magnet passes through the magnetic attraction iron core rod to lock the cover body. The magnetic attraction locking assembly is simple in principle and structure, low in cost and convenient to operate by a user, and the appearance of a product is hardly influenced when the assembly is assembled to the product.

Description

Cooking utensil

Technical Field

The invention relates to the field of household appliances, in particular to a cooking appliance.

Background

In the household electrical appliances such as electric rice cookers, in order to facilitate the engagement of the upper cover with the cooker body, a set of cover locking mechanism is usually designed for engagement, and such cover locking mechanism is usually a mechanical engagement locking structure such as a push-type locking mechanism.

The mechanical buckle locking structure additionally arranged on the product needs to be compact in structure and small in occupied space so as to avoid excessive influence on the appearance of the product, but the appearance of the product is more complex more or less, and the appearance design of the product is influenced.

In addition, in order to ensure the smooth operation of opening and closing the cover, the mechanical buckle locking structure not only needs to be small in size, but also needs to be very accurate in size, otherwise, the phenomena of tripping or not closing the cover and the like can occur, and the use of a user is directly influenced. In addition, the mechanical snap-lock button is usually disposed on the cover, and is easily scalded by high-temperature steam when operated by a user.

Disclosure of Invention

The invention aims to provide a cooking appliance, which has a simple opening and closing cover structure, is convenient to operate, has low cost and does not influence the appearance of the product.

In order to achieve the above object, the present invention provides a cooking appliance, comprising a base and a cover, wherein the cover is pivotally mounted on the base in an openable manner, a pivotal connection portion between the base and the cover is provided with a pivotal spring, and distal ends of the base and the cover opposite to the pivotal connection portion are provided with a magnetic attraction locking component for magnetically opening and closing the cover; the magnetic attraction locking assembly comprises a first magnetic attraction piece and a second magnetic attraction piece, one of the first magnetic attraction piece and the second magnetic attraction piece is arranged on the base, the other one of the first magnetic attraction piece and the second magnetic attraction piece is arranged on the cover, and the first magnetic attraction piece and the second magnetic attraction piece are in magnetic attraction matching to lock the cover on the base.

The first magnetic part is a magnet, the second magnetic part is an iron core rod in an electromagnet loop, and the iron core rod is a telescopic movable rod capable of moving between a close position and a far position relative to the magnet in a cover closing state of the cover body; at the close position, relative to a pivot hinge point between the cover body and the base body, the sum of the magnetic attraction torque of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque of the cover body is greater than the reset torque of the pivot spring so as to lock the cover body; in the far position, the sum of the magnetic attraction torque of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque of the cover body is smaller than the reset torque of the pivoting spring so as to open the cover body.

Preferably, the electromagnet loop comprises a current reversing switch for switching the current flowing through the electromagnet, and the current reversing switch can enable the electromagnet to generate a repulsive magnetic force relative to the magnet to open the cover body or switch to generate a magnetic attracting force relative to the magnet to enable the cover body to be self-locked.

Preferably, the electromagnet loop is provided with a circuit on-off switch.

Preferably, the electromagnet circuit comprises an on-off circuit switch, and in an on state of the on-off circuit switch, the core rod moves from the close position to the far position to be further inserted into the conductive winding of the electromagnet.

Preferably, the proximal end of the iron core rod with respect to the magnet is formed as a large head end.

Preferably, the cooking appliance further comprises a toggle mechanism with a toggle switch, the toggle mechanism toggling the plunger rod from the proximate position toward the remote position upon activation of the toggle switch.

Preferably, the electromagnet loop comprises a slide rheostat connected with the electromagnet in parallel and provided with a slide switch, and the cover body can be locked or unlocked by shifting the slide switch to change the magnetic attraction force of the electromagnet and the magnet.

Preferably, the electromagnet loop is electrically connected to an ac power supply loop of the cooking appliance.

Preferably, cooking utensil still includes the subassembly that separates magnetism, the subassembly that separates magnetism includes the magnetism piece that separates the magnetism material and the button that separates magnetism that has reset spring, it can drive to separate magnetism the button under the state of being pressed the magnetism piece stretches into in order to restrain magnetism between magnet and the iron core stick.

Preferably, the cooking appliance is an electric cooker.

Preferably, the cover body is a rectangular profile, the rectangular profile comprises a first rectangular side, a second rectangular side, a third rectangular side and a fourth rectangular side which are sequentially connected, a pivot hinge point between the cover body and the base body is formed at the midpoint position of the first rectangular side, and the magnetic attraction locking component is arranged at the midpoint position of the third rectangular side and/or the magnetic attraction locking component is arranged at the symmetrical positions of the second rectangular side and the fourth rectangular side.

In the cooking appliance, the magnetic attraction locking component is innovatively arranged to replace the existing mechanical buckle locking structure, two magnets of the magnetic attraction locking component are respectively arranged on the cover body and the base body, the two magnets are aligned up and down only when the cover is closed, high-precision manufacturing and assembling are not needed, the appearance of a product is not affected, the operation is convenient, and the cover can be opened and closed only by operating a key. Through parameter design and the like, the cover body self-locking and automatic cover opening effects can be well achieved, the overall cost is low, and the cover body self-locking and automatic cover opening device can be applied to different cooking appliances more.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of a cover opening and closing mechanism of a cooking appliance according to a first preferred embodiment of the present invention;

fig. 2 is a schematic view of a cover opening and closing mechanism of a cooking appliance according to a second preferred embodiment of the present invention;

FIG. 3 is a schematic view of the lid opening and closing mechanism of the cooking appliance shown in FIG. 2 during the lid opening prevention stage (lid self-locking);

FIG. 4 is a schematic view of a lid opening and closing mechanism of the cooking appliance shown in FIG. 2 at a stage when the lid is opened;

fig. 5 is a schematic structural view of the cooking appliance shown in fig. 2 after the cover is opened;

fig. 6 is a schematic view of the lid opening and closing mechanism of the cooking appliance according to the third preferred embodiment of the present invention, illustrating a moment analysis of the lid opening and closing mechanism at the stage of preventing the lid from being opened;

FIG. 7 illustrates a moment analysis of the lid opening and closing mechanism of the cooking appliance of FIG. 6 during a stage in which lid opening is required;

fig. 8 is a schematic view of a cover opening and closing mechanism of a cooking appliance according to a fourth preferred embodiment of the present invention;

FIG. 9 is an enlarged view of a portion of the magnetic locking assembly of FIG. 8;

fig. 10 is a schematic structural view of the cooking appliance shown in fig. 8 at a stage when the lid is opened;

FIG. 11 is an enlarged view of a portion of the magnetic locking assembly of FIG. 10;

fig. 12 is a schematic structural view of the cooking appliance shown in fig. 8 after the cover is opened;

fig. 13 to 15 are schematic views of a lid opening and closing mechanism of a cooking appliance according to a fifth preferred embodiment of the present invention, sequentially illustrating the processes of the magnetism isolating button before, after and after opening the lid;

FIG. 16 illustrates various possible positions of the magnetically attractive locking assembly in the rice cooker; and

fig. 17 is a circuit schematic of an exemplary current commutating switch.

Description of the reference numerals

1 pivoting spring 2 pivoting shaft

3 magnet 4 iron core rod

5 circuit on-off switch 6 magnetic isolation sheet

7 magnetism isolating button 8 slide rheostat

9 ganged switch

OO' pivot hinge point at 41 big end

100 cover 200 base

Setting positions of P1-P5 magnetic attraction locking components

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.

The invention provides a novel cooking appliance, which comprises a base body 200 and a cover body 100, and the cover body 100 is pivotally arranged on the base body 200 in an openable and closable manner, and is shown in figure 1. The pivotal connection portion between the base 200 and the cover 100 is provided with a pivotal spring 1 (e.g., a torsion spring) sleeved on the pivotal shaft 2, and the distal ends of the base 200 and the cover 100 opposite to the pivotal connection portion are provided with a magnetic attraction locking component for magnetically opening and closing the cover.

Specifically, the magnetic locking assembly may include a first magnetic member and a second magnetic member, one of the first magnetic member and the second magnetic member is disposed on the base 200, the other one of the first magnetic member and the second magnetic member is disposed on the cover 100, and the first magnetic member and the second magnetic member are magnetically engaged to lock the cover 100 to the base.

Obviously, the magnetic attraction locking component is adopted in the product of the invention to replace the traditional mechanical buckle locking structure. The magnetic attraction locking component does not need structural matching or direct contact, has low requirements on manufacturing precision, assembling form and position precision and the like, is even not limited to an exposed type, can be made into a hidden design hidden in a product body, and does not influence the appearance of the product completely.

In one embodiment shown in fig. 1, the magnetic fastening can be simply realized by only installing the magnet 3, i.e. the first magnetic member, at the respective distal ends of the cover 100 and the base 20. When the cover is closed, the self-locking of the cover body is realized through the magnetic attraction force between the magnets 3. When the cover is required to be opened, the cover is opened only through manual operation and manpower.

The magnet 3 is not limited to a permanent magnet, and may be an electromagnet or the like whose magnetic attraction force is adjustable. As shown in fig. 2, another embodiment of the magnetic locking assembly includes a magnet 3 and an electromagnet loop with a core rod 4 (i.e., a second magnetic member), one of the magnet 3 and the electromagnet loop is disposed at the distal end of the base 200, the other is disposed at the distal end of the cover 100, and the magnet 3 passes through the core rod 4 to lock the cover 100. Wherein, there is magnetic attraction between iron core rod 4 self and magnet 3, forms the electro-magnet through electrically conductive after, multiplicable magnetic attraction, but also can form magnetic repulsion. Thus, the cover can be automatically opened and closed by the electromagnet loop. For example, in the lid open prevention stage of fig. 3, it is necessary to achieve self-locking of the lid body, thus creating an enhanced magnetic attraction force between the electromagnet and the magnet, Fa as indicated by the arrow in the figure. In the stage of needing to open the cover as shown in fig. 4, the polarity of the electromagnet is reversed, so that a magnetic repulsion Fb is generated between the electromagnet and the magnet to automatically open the cover, which is shown in fig. 5 after the cover is automatically opened.

As shown in fig. 2, the electromagnet loop is provided with a circuit on-off switch 5 for controlling whether the electromagnet is electrified or not. When the circuit on-off switch 5 is pressed down to generate enhanced magnetic attraction between the electromagnet and the magnet, the circuit on-off switch 5 constitutes a cover body self-locking switch button. When the circuit on-off switch 5 is pressed down so that an enhanced magnetic repulsive force is generated between the electromagnet and the magnet, the circuit on-off switch 5 constitutes a door-opening button.

Generally, the electromagnet loop is electrically connected to the power source of the cooking appliance, i.e. typically an ac electromagnet. Of course, the electromagnet loop can also be provided with a power supply, such as a power supply battery, to form a direct current electromagnet. As is well known to those skilled in the art, an ac electromagnet has a characteristic that the attraction force is relatively constant, but the attraction process may generate slight vibration, and the winding coil of the electromagnet may overheat. The direct current electromagnet does not generate vibration in the suction process, the coil is not overheated, and the suction force is an increasing process. Therefore, the energizing pattern of the electromagnet has advantages and disadvantages, and is designed according to specific product requirements, and is not discussed more here.

When the electromagnet loop is electrically connected with the power supply of the cooking utensil, if the product is not electrified, the cover body is self-locked by depending on the suction force of the magnet 3 and the iron core rod 4, and the cover body 100 is opened manually. If the product is electrified, self-locking can be further enhanced through the electromagnet, and the cover body 100 can be automatically opened through polarity reversing of the electromagnet.

The electromagnet loop preferably includes a current reversing switch for switching the current flowing through the electromagnet no matter the electromagnet loop is connected with an alternating current power supply or a direct current power supply, so as to realize timely polarity reversing of the electromagnet when the cover is opened or closed, that is, the current reversing switch can enable the electromagnet to generate repulsive magnetic force relative to the magnet 3 to open the cover body 100, or switch to generate magnetic attraction force relative to the magnet 3 to enable the cover body 100 to be self-locked. Such a current reversing switch can be implemented by a program setting of the power supply control unit or by a simple bridge switch circuit, as shown in fig. 17, in one example, two ganged switches 9 constitute a current reversing switch, i.e. the switching of the direction of flow of the electromagnet can be implemented in combination with a bridge circuit. Therefore, the current reversing switch may be embodied as a physical switch, or may be a virtual display key of a display screen, which is known to those skilled in the art and will not be described in detail herein.

Particularly, in order to further realize the gradual change adjustment of the magnitude of the magnetic attraction force or the magnetic repulsion force, facilitate self-locking or automatic uncovering, and change the current magnitude in the electromagnet loop. Likewise, those skilled in the art will appreciate that such current level adjustment may be accomplished by a variety of simple external circuits or controller controls. In one embodiment of the present invention, as shown in fig. 6 and 7, the electromagnet loop includes a slide rheostat 8 with a slide switch connected in parallel with the electromagnet, and the cover 100 can be locked or unlocked by shifting the slide switch to change the magnetic attraction force between the electromagnet and the magnet 3. Thus, the slide rheostat 8 can be combined to realize gradual adjustment control of the electromagnetic attraction force by changing the current.

As shown in fig. 8 to 12, in another preferred embodiment of the present invention, the iron core rod 4 is preferably a telescopic movable rod that is movable between an approaching position and a distant position with respect to the magnet 3, in the closed state of the lid body 100, the magnetic attraction between the iron core rod 4 and the magnet 3 is large in the approaching position, the lid body 100 is in the closed state, and in the distant position, the magnetic attraction between the iron core rod 4 and the magnet 3 is weakened, and the lid body 100 can be automatically pivoted open to the opened state shown in fig. 12. Therefore, the automatic cover locking and uncovering can be well completed by designing parameters such as the moving stroke, the distance and the like of the iron core rod 4.

Specifically, in the close position shown in fig. 8 and 9, the minimum distance between the iron core rod 4 and the magnet 3 is a, and with respect to the pivot hinge point between the cover body 100 and the base body 200, it should be ensured that the sum of the magnetic attraction torque of the magnetic attraction force between the magnet 3 and the iron core rod 4 and the gravity center torque of the cover body 100 is greater than the reset torque of the pivot spring 1, so as to realize the cover body locking; in the remote position shown in fig. 10 and 11, the minimum distance between the iron core rod 4 and the magnet 3 is increased to b, so that the sum of the magnetic attraction torque of the magnetic attraction force between the magnet 3 and the iron core rod 4 and the gravity center torque of the cover body 100 is ensured to be smaller than the reset torque of the pivot spring 1, so as to automatically open the cover body 100. After the cover 100 is opened, as shown in fig. 12, the core rod 4 is reset to the core rod position shown in fig. 8 and 9.

To achieve the opening and closing of the lid to move the core rod 4 in coordination, in one implementation, the cooking appliance may include a toggle mechanism (not shown) with a toggle switch that toggles the core rod 4 from the proximal position to the distal position upon activation of the toggle switch, i.e., moves the core rod 4 away from the magnet 3 by an external force. In this way, the lever switch is configured as a lid opening button. Normally, the iron core rod 4 is disposed in the cover body 100, as shown in fig. 8, and the toggle lever switch may be disposed on the surface cover of the cover body 100 accordingly, so as to facilitate the pressing operation by the user.

The above iron core rod 4 may be a separate iron rod or iron block. Further, the magnetic locking assembly may include an electromagnet loop having an electromagnet, as shown in fig. 9, the electromagnet includes a core rod 4 and a conductive winding wound around the core rod 4. At this time, the core rod 4 is an inductive core of an electromagnet, and in the conductive state, the core rod 4 is magnetically attracted to be automatically away from the magnet 3, so that the state of fig. 9 is changed to the state of fig. 11. At this time, the electromagnet circuit includes a circuit on-off switch 5 as a core rod movement control valve, and in the on state of the circuit on-off switch 5, the core rod 4 is moved from the close position toward the distant position to be further inserted into the conductive winding. Further, in the on state of the on/off switch 5, the electromagnet can generate a repulsive magnetic force with respect to the magnet 3, which is more advantageous for opening the cover body 100. Wherein preferably, the near end of the iron core rod 4 relative to the magnet 3 is formed into a large end 41 for facilitating magnetic attraction.

In another preferred embodiment of the present invention as shown in fig. 13 to 15, a magnetism isolating assembly is further added, the magnetism isolating assembly includes a movably disposed magnetism isolating sheet 6, and the magnetism isolating sheet 6 can be pushed into or pulled out from between the upper magnetic attraction body and the lower magnetic attraction body to correspondingly control the opening or attraction of the cover body 100. Compared with the electromagnetic iron pole reversing mode, the box cover opening control mode of the magnetism isolating component has the advantages of lower cost and simplicity and convenience in operation.

The magnetic isolation assembly is used for controllably extending into the space between the upper magnetic attraction body and the lower magnetic attraction body to block or reduce the magnetic attraction force between the upper magnetic attraction body and the lower magnetic attraction body, and therefore the purpose of opening the cover is controlled.

Specifically, as shown in fig. 13, the magnetism isolating assembly includes a magnetism isolating button 7 with a return spring, and the magnetism isolating button 7 is connected to the magnetism isolating sheet 6 and can drive the magnetism isolating sheet 6 to extend into between the upper magnetic attraction body and the lower magnetic attraction body to inhibit magnetic attraction when the button is pressed. After the cover 100 is opened, as shown in fig. 15, the magnetism isolating button 7 is released, and then the magnetism isolating button 7 is smoothly returned to the state before being pressed by the return spring.

The magnetism isolating sheet 6 may be in a sheet shape and inserted between the upper and lower magnetic attraction bodies (i.e. the first and second magnetic attraction bodies), but in consideration of a better magnetism isolating effect, the magnetism isolating sheet 6 shown in the figure is preferably formed into a frame structure with one open end, and in a button-pressed state of the magnetism isolating button 7, the upper magnetic attraction body or the lower magnetic attraction body is completely framed in the frame structure.

The magnetic shielding sheet 6 may be made of any material capable of blocking or suppressing magnetism, and may be made of, for example, aluminum material, aluminum alloy sheet, stainless steel sheet, copper sheet, etc.

Since the lid 100 needs to be pivoted open, the magnetism isolating button 7 is preferably provided on the base 200 as shown in fig. 13 and 14, so as to prevent the lid from being touched during opening the lid and avoid scalding hands with high temperature steam.

It should be noted that the upper magnetic attraction body and the lower magnetic attraction body shown in fig. 13 to 15 are in a state of magnetic poles attracting each other when the cover is closed. The upper and lower magnetic attraction bodies can be both permanent magnets, or either one of the upper and lower magnetic attraction bodies is a permanent magnet and the other is an iron block. Moreover, any one of the upper magnetic attraction body and the lower magnetic attraction body can also be an electromagnet, such as an alternating current electromagnet connected with an alternating current power supply. An on-off switch 5 for controlling whether the electromagnet 5 is electrified or not can be preferably arranged in the electromagnet loop of the electromagnet.

The on/off switch 5, the current reversing switch, the slide switch of the slide rheostat 8, the magnetism isolating button 7, and the like may be used alone as a cover-opening button switch or may be used in combination as a cover-opening button combination switch.

The magnetic attraction locking assembly can be applied to various cooking appliances, in particular to an electric cooker, and is used for controlling the opening and closing cover and the locking cover of a cooker cover and a cooker body. In a specific application, most of the electric cookers in the market are rectangular, as shown in fig. 16, the rectangular outline of the electric cooker includes a first rectangular side, a second rectangular side, a third rectangular side and a fourth rectangular side which are connected in sequence, a pivot hinge point between the cover body 100 and the base body 200 is formed at a midpoint position of the first rectangular side, i.e., a pivot hinge point OO' in the figure, and the magnetic attraction locking component can be disposed at a midpoint position of the third rectangular side and/or the magnetic attraction locking component is disposed at a symmetrical position of the second rectangular side and the fourth rectangular side, e.g., the magnetic attraction locking component disposed positions P1, P2, P3, P4 and P5 in the figure.

Various embodiments of a magnetically attractive locking assembly for use in food preparation are set forth above. In specific application, the design of each structural parameter needs to be specifically set according to the requirements of opening and closing the cover.

Referring to fig. 6, in the closed state of the cover body 100, the return torque M2 of the pivot spring 1 is smaller than the sum of the magnetic attraction torque M3 of the magnetic attraction force between the magnet 3 and the iron core rod 4 and the gravity center torque M1 of the cover body 100 with respect to the pivot hinge point (i.e., the pivot hinge point OO' shown in fig. 16) between the cover body 100 and the seat body 200. Therefore, the cover locking moment is larger than the cover opening moment in the cover opening prevention stage, and the self-locking of the cover body is realized.

Specifically, in various embodiments, when the electromagnet is not energized, the magnetic attraction force between the magnet 3 and the iron core rod 4 is relatively small, but the cover body can be self-locked. In order to ensure the safety and reliability of the self-locking of the cover body, a margin design needs to be provided for the cover locking moment, for example, M3- (M2-M1) >1Nm is met, so that the cover body can be automatically opened due to the internal pressure of the cooking utensil and the like.

When an electromagnet loop exists, the magnetic attraction force is enhanced by the conductive winding wound on the iron core rod 4, the self-locking performance of the cover body is enhanced by the conductive electromagnet, and the allowance design of the cover locking torque can be better met. However, in order to increase the magnetic induction efficiency, in the electrically conductive state of the electromagnet, it is preferable to satisfy: m3- (M2-M1) <15Nm to contribute to low power consumption of the product and to extend the life of electric devices.

Referring to fig. 7, in a stage of requiring opening the lid in the closed state, the current flowing through the electromagnet may be switched by the current reversing switch, so that the electromagnet generates a repulsive magnetic force with respect to the magnet 3 to open the lid body 100. In this state, when the cover body 100 is in the closed state and the electromagnet is electrically conductive, the sum of the repulsive torque M4 of the repulsive magnetic force between the magnet 3 and the electromagnet and the return torque M2 of the pivot spring 1 is greater than the gravity center torque M1 of the cover body 100 with respect to the pivot hinge point, that is, the upward torque is greater than the downward torque in fig. 7, and the cover body 100 can be opened.

Similarly, in order to ensure the reliability of the opening, the opening torque needs to be designed to be margin, for example, M4+ M2-M1>1Nm, so as to prevent the opening caused by accidental vibration or impact or the automatic opening of the cover due to internal pressure and the like.

In summary, the invention designs a novel magnetic attraction locking mechanism for opening and closing a cover, which can be applied to products such as electric cookers and the like. Through the magnet attraction mode of the upper magnet and the lower magnet, when the cover body can not be opened in certain operation procedures (such as a rice washing process), the cover body can be self-locked through the cover closing magnetic attraction mode. When the lid is opened to needs, only need through for example traditional simple button mode, can reduce magnetism fast and inhale resultant force, guarantee that the lid is opened safely, can not increase too much product cost again, can hide in lid and seat in addition, do not influence product appearance completely.

The preferred embodiments of the present invention are described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and within the scope of the technical idea of the present invention, the technical solution of the present invention can be modified in many ways, for example, the part of the magnetic attraction locking mechanism located in the cover body can be exchanged with the part thereof located in the seat body; the electromagnet is not limited to the one shown in the figure and can be arranged on the cover body, the electromagnet can also be arranged on the base body, even the magnets on the cover body and the base body can be set as the electromagnet, the current magnitude control of the electromagnet is not limited to the sliding rheostat mode, and the current with proper magnitude can be distributed through an external current supply unit, and the like, and the simple modifications belong to the protection scope of the invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (11)

1. A cooking utensil comprises a base body (200) and a cover body (100), wherein the cover body (100) is pivotally mounted on the base body (200) in an opening and closing manner, and is characterized in that a pivotal connection part between the base body (200) and the cover body (100) is provided with a pivotal spring (1), and the far ends of the base body (200) and the cover body (100) relative to the pivotal connection part are provided with magnetic attraction locking components for magnetically opening and closing the cover; the magnetic attraction locking component comprises a first magnetic attraction piece and a second magnetic attraction piece, one of the first magnetic attraction piece and the second magnetic attraction piece is arranged on the seat body (200), the other one of the first magnetic attraction piece and the second magnetic attraction piece is arranged on the cover body (100), and the first magnetic attraction piece and the second magnetic attraction piece are in magnetic attraction fit to lock the cover body (100) on the seat body (200);

the first magnetic part is a magnet (3), the second magnetic part is an iron core rod (4) in an electromagnet loop, and the iron core rod (4) is a telescopic movable rod capable of moving between a close position and a far position relative to the magnet (3) in a cover closing state of the cover body (100);

in the close position, relative to a pivot hinge point between the cover body (100) and the base body (200), the sum of the magnetic attraction torque of the magnetic attraction force between the magnet (3) and the iron core rod (4) and the gravity center torque of the cover body (100) is greater than the reset torque of the pivot spring (1) so as to lock the cover body (100);

in the far position, the sum of the magnetic attraction torque of the magnetic attraction force between the magnet (3) and the iron core rod (4) and the gravity center torque of the cover body (100) is smaller than the reset torque of the pivoting spring (1) so as to open the cover body (100).

2. The cooking appliance according to claim 1, wherein the electromagnet circuit comprises a current reversing switch for switching the direction of current flowing through the electromagnet, wherein the current reversing switch is capable of causing the electromagnet to generate a repulsive magnetic force with respect to the magnet (3) to open the cover (100) or to generate a magnetic attracting force with respect to the magnet (3) to make the cover (100) self-locking.

3. Cooking appliance according to claim 2, characterized in that the electromagnet circuit is provided with an on-off circuit switch (5).

4. Cooking appliance according to claim 1, characterized in that the electromagnet circuit comprises an on-off circuit switch (5), in the conductive state of the on-off circuit switch (5) the core rod (4) being moved from the close position towards the distant position for further insertion into the conductive winding of the electromagnet.

5. Cooking appliance according to claim 4, characterized in that the proximal end of the iron core rod (4) with respect to the magnet (3) is formed as a large head (41).

6. The cooking appliance according to claim 5, wherein the cooking appliance further comprises a toggle mechanism with a toggle switch, the toggle mechanism toggling the plunger (4) from the proximate position toward the remote position upon activation of the toggle switch.

7. The cooking appliance according to any one of claims 1 to 6, wherein the electromagnet loop comprises a slide rheostat (8) with a slide switch connected in parallel with the electromagnet, and the cover (100) can be locked or unlocked by toggling the slide switch to change the magnetic attraction force of the electromagnet and the magnet (3).

8. The cooking appliance of claim 1, wherein the electromagnet loop is electrically connected to an ac power supply loop of the cooking appliance.

9. The cooking appliance according to claim 1, further comprising a magnetism isolating component, wherein the magnetism isolating component comprises a magnetism isolating sheet (6) made of magnetism isolating materials and a magnetism isolating button (7) with a return spring, and the magnetism isolating button (7) can drive the magnetism isolating sheet (6) to extend into a position between the first magnetic piece (3) and the second magnetic piece (4) under a pressed state so as to inhibit magnetic attraction.

10. The cooking appliance of claim 1, wherein the cooking appliance is a rice cooker.

11. The cooking appliance according to claim 10, wherein the cover body (100) has a rectangular profile including a first rectangular side, a second rectangular side, a third rectangular side and a fourth rectangular side connected in sequence, a pivot hinge point between the cover body (100) and the base body (200) is formed at a midpoint of the first rectangular side, and the magnetically attractive locking component is disposed at a midpoint of the third rectangular side and/or the magnetically attractive locking component is disposed at a symmetrical position of the second rectangular side and the fourth rectangular side.

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