CN109965665B

CN109965665B - Cooking utensil

Info

Publication number: CN109965665B
Application number: CN201711446836.4A
Authority: CN
Inventors: 杨保民; 潘典国; 周忠宝; 周亚; 何新华; 刘小力; 刘小凯; 娄飞
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2017-12-27
Filing date: 2017-12-27
Publication date: 2022-03-04
Anticipated expiration: 2037-12-27
Also published as: CN109965665A

Abstract

The invention discloses a cooking utensil, which comprises a base body (200), a cover body (100) which is pivotally arranged on the base body in an openable and closable manner, a pivoting spring (1) arranged at a pivoting connection part between the base body and the cover body and an attraction component arranged at the far ends of the base body and the cover body relative to the pivoting connection part, wherein the attraction component is used for magnetically opening and closing the cover and comprises a magnet (3) and an iron core rod (4), one of the magnet and the iron core rod is arranged at the far end of the base body, the other one of the magnet and the iron core rod is arranged at the far end of the cover body, and the magnet is used for locking the cover body through the magnetic iron core rod; under the cover closing state of the cover body, relative to a pivot hinge point between the cover body and the seat body, the reset torque M2 of the pivot spring is smaller than the sum of the attraction torque M3 of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque M1 of the cover body, so that the purpose of self-locking of the cover body is achieved. The opening and closing cover of the cooking utensil has the advantages of simple structure, convenience in assembly, reasonable parameter design, accurate opening and closing cover control and convenience for user operation.

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 low in cost, is accurately controlled and is convenient for a user to operate.

In order to achieve the above object, the present invention provides a cooking appliance, including a base and a cover, the cover being pivotally mounted on the base in an openable manner, the cooking appliance further including:

the pivoting spring is arranged at a pivoting connection part between the base body and the cover body; and

the suction assembly comprises a first suction piece and a second suction piece, one of the first suction piece and the second suction piece is arranged on the seat body, the other one of the first suction piece and the second suction piece is arranged on the cover body, and the first suction piece and the second suction piece are sucked to lock the cover body on the seat body;

under the cover closing state of the cover body, relative to a pivot hinge point between the cover body and the seat body, the reset torque M2 of the pivot spring is smaller than the sum of the attraction torque M3 of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque M1 of the cover body.

Further, M3- (M2-M1) >1Nm is satisfied.

Further, M3- (M2-M1) <15Nm was satisfied.

Preferably, the actuation component is a magnetic actuation component and comprises a magnet as the first actuation component and an electromagnet loop provided with an electromagnet of the second actuation component, wherein the electromagnet comprises an iron core rod and a conductive winding wound on the iron core rod.

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, in the closed state of the cover body and the conductive state of the electromagnet, a sum of a repulsive torque M4 of a repulsive magnetic force between the magnet and the electromagnet and a return torque M2 of the pivot spring with respect to the pivot hinge point is larger than a gravity center torque M1 of the cover body.

Further, M4+ M2-M1>1Nm is satisfied.

Preferably, the electromagnet loop is provided with a circuit on-off switch for controlling electrification of the electromagnet.

Preferably, 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;

in the close position, relative to a pivot hinge point between the cover body and the seat body, the sum of the attraction torque M3 of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque M1 of the cover body is greater than the reset torque M2 of the pivot spring so as to lock the cover body;

in the far position, the sum of the attracting torque M3 of the magnetic attraction force between the magnet and the iron core rod and the gravity center torque M1 of the cover body is smaller than the return torque M2 of the pivoting spring to open the cover body.

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 electromagnet loop comprises a slide rheostat with a slide switch connected in parallel with the electromagnet, 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 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 is an ac electromagnet.

Preferably, the magnet may also be an electromagnet.

Preferably in addition, the actuation subassembly is inhaled the subassembly for magnetism and is inhaled a piece and second magnetism including first magnetism, cooking utensil still includes magnetism isolating component, magnetism isolating component includes magnetism isolating sheet and the magnetism isolating button that has reset spring of magnetism isolating material, magnetism isolating button can be driven under the pressed state magnetism isolating sheet stretches into it is inhaled in order to restrain magnetism between the piece to inhale for first magnetism and second magnetism.

Preferably, the cooking appliance is an electric cooker, 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 attraction component is arranged at the midpoint position of the third rectangular side and/or at the symmetrical position of the second rectangular side and the fourth rectangular side.

In the cooking appliance according to the invention, the attraction assembly is adopted to replace a conventional mechanical buckle locking structure, and two magnet units of the attraction assembly can be respectively arranged on the cover body and the base body and only need to be aligned up and down when the cover is closed. Therefore, the attraction component is simple in structure and convenient to assemble, high-precision manufacturing and assembling are not needed, the appearance of a product is not affected after the attraction component is assembled, user operation is facilitated, and the cover can be opened and closed only by controlling the magnetic attraction or magnetic repulsion effect through the key. On the basis of the structure, through optimizing parameter design and the like, the cover body self-locking and automatic uncovering effects can be well achieved, energy consumption is saved, and the service life is prolonged.

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 partial view of the portion of the engagement 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 partial view of the portion of the engagement 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 arrangement positions of the attraction and separation 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 attracting 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 suction assembly for opening and closing the cover.

The suction assembly for controlling the opening and closing of the cover may include a first suction member and a second suction member, one of the first suction member and the second suction member is disposed on the base 200, the other is disposed on the cover 100, and the first suction member and the second suction member are sucked to lock the cover 100 on the base 200. The suction assembly may be in various suction modes, such as a vacuum suction mode, a magnetic suction mode as described in detail below, and the like.

Obviously, the attraction component is adopted in the product of the invention to replace the traditional mechanical buckle locking structure. The attraction-suction assembly does not need structural cooperation 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 attraction fastening can be simply realized by only installing the magnet 3 at the distal end of each of the cover 100 and the base 20, wherein the first attraction member and the second attraction member are both the magnet 3. 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, the attraction assembly of another embodiment includes a magnet 3 as a first attraction member and an electromagnet circuit with an iron core rod 4 as a second attraction member, one of the magnet 3 and the electromagnet circuit 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 iron 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 tooth 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 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 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 attraction assembly may include an electromagnet circuit provided with an electromagnet including the core rod 4 and a conductive winding wound around the core rod 4, as shown in fig. 9. 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 magnetism isolating component is used for controllably extending between the upper magnetic attraction body and the lower magnetic attraction body (namely between the first attraction component and the second attraction component) so as 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 controlling the cover opening is achieved.

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 magnetic shielding sheet 6 may be in the form of a sheet and inserted between the upper and lower magnetic attraction bodies, but in consideration of better magnetic shielding effect, the magnetic shielding sheet 6 shown in the figure is preferably formed into a frame structure with one open end, and the upper or lower magnetic attraction body is integrally framed in the frame structure in the button-pressed state of the magnetic shielding button 7.

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

Various embodiments of an engaging and engaging assembly for use in food preparation have been 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, with respect to a pivot hinge point (i.e., the pivot hinge point OO' shown in fig. 16) between the cover body 100 and the holder body 200, a return torque M2 of the pivot spring 1 is smaller than a sum of a pull-in torque M3 of a magnetic attraction force between the magnet 3 and the iron core rod 4 and a gravity center torque M1 of the cover body 100. 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.

According to the moment analysis, the corresponding torsion spring, magnet and the like can be purposefully selected according to design parameters so as to achieve the control of opening and closing the cover according with the design requirement.

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

1. A cooking appliance comprising a base (200) and a cover (100), the cover (100) being openably and closably pivotally mounted on the base (200), the cooking appliance further comprising:

the pivoting spring (1) is arranged at a pivoting connection part between the base body (200) and the cover body (100); and

the attraction component comprises a first attraction component and a second attraction component, one of the first attraction component and the second attraction component is arranged on the seat body (200), the other one of the first attraction component and the second attraction component is arranged on the cover body (100), and the first attraction component and the second attraction component are attracted to lock the cover body (100) on the seat body (200);

in the cover closing state of the cover body (100), relative to a pivot hinge point between the cover body (100) and the seat body (200), the return torque M2 of the pivot spring (1) is smaller than the sum of the attraction torque M3 of the first attraction part and the second attraction part and the gravity center torque M1 of the cover body (100);

the piece is inhaled for magnetism to the actuation subassembly and includes that first magnetism is inhaled and the second magnetism is inhaled, cooking utensil still includes the magnetism subassembly that separates, separate the magnetism subassembly including separating magnetic sheet (6) of magnetism material and having reset spring separate magnetism button (7), it sets up in pedestal (200) and can be driven under the state of being pressed to separate magnetism button (7) and inhale in order to restrain magnetism between the piece is inhaled to magnetism for first magnetism and second magnetism.

2. The cooking appliance of claim 1, wherein M3- (M2-M1) >1 Nm.

3. The cooking appliance of claim 1, wherein M3- (M2-M1) <15 Nm.

4. The cooking appliance according to any one of claims 1 to 3, wherein the attraction component is a magnetic attraction component and comprises a magnet (3) as the first attraction component and an electromagnet loop provided with an electromagnet as the second attraction component, wherein the electromagnet comprises an iron core rod (4) and a conductive winding wound around the iron core rod (4).

5. The cooking appliance according to claim 4, wherein the electromagnet circuit comprises a current reversing switch for switching the direction of current flowing through the electromagnet, wherein the current reversing switch can enable the electromagnet to generate a repulsive magnetic force relative to the magnet (3) to open the cover (100) or to generate a magnetic attracting force relative to the magnet (3) to make the cover (100) self-locking.

6. The cooking appliance according to claim 5, wherein in the closed state of the lid (100) and in the conductive state of the electromagnet, with respect to the pivot hinge point, the sum of the repulsive magnetic torque M4 between the magnet (3) and the electromagnet and the return torque M2 of the pivot spring (1) is greater than the center of gravity torque M1 of the lid (100).

7. The cooking appliance of claim 6, wherein M4+ M2-M1>1 Nm.

8. Cooking appliance according to claim 4, characterized in that the electromagnet circuit is provided with an on-off circuit switch (5) for controlling the electrification of the electromagnet.

9. The cooking appliance according to claim 8, wherein the iron core rod (4) is a telescopic movable rod movable between a close position and a distant position with respect to the magnet (3) in a closed state of the lid body (100);

in the close position, relative to a pivot hinge point between the cover body (100) and the seat body (200), the sum of the attracting 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) is greater than the reset torque M2 of the pivot spring (1) to lock the cover body (100);

in the far position, the sum of the attracting 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) is smaller than the reset torque M2 of the pivoting spring (1) so as to open the cover body (100).

10. Cooking appliance according to claim 9, 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.

11. Cooking appliance according to claim 4, characterized in that the electromagnet circuit comprises a sliding rheostat (8) with a sliding switch connected in parallel with the electromagnet, which allows to lock or unlock the cover (100) by toggling the sliding switch to change the magnetic attraction force of the electromagnet and the magnet (3).

12. The cooking appliance of claim 4, wherein the electromagnet is an AC electromagnet.

13. Cooking appliance according to claim 4, characterized in that the magnet (3) is an electromagnet.

14. The cooking appliance according to claim 1, wherein the cooking appliance is an electric cooker, the cover (100) 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 (100) and the base (200) is formed at a midpoint position of the first rectangular side, and the attraction component is arranged at a midpoint position of the third rectangular side and/or the attraction component is arranged at a symmetrical position of the second rectangular side and the fourth rectangular side.