CN210330260U

CN210330260U - A anti-overflow device and cooking utensil for cooking utensil

Info

Publication number: CN210330260U
Application number: CN201822007264.6U
Authority: CN
Inventors: 樊杜平; 陈建化; 曹凯; 黄少萍
Original assignee: SEB SA
Current assignee: Zhejiang Supor Electrical Appliances Manufacturing Co Ltd; SEB SA
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-04-17
Anticipated expiration: 2028-11-30

Abstract

The utility model discloses an anti-overflow device and cooking utensil for cooking utensil, anti-overflow device includes: a conductive probe comprising a detection end and a connection end, wherein a capacitance value of the conductive probe changes as the detection end approaches or contacts a medium in the cooking appliance; and the control module is electrically connected with the conductive probe through the connecting end and judges whether the anti-overflow operation is performed or not according to the change of the capacitance value of the conductive probe, wherein the outer surface of the detection end is a spherical surface. According to the utility model discloses an anti-overflow device cost is lower, and sensitivity is higher, the erroneous judgement probability is lower.

Description

A anti-overflow device and cooking utensil for cooking utensil

Technical Field

The utility model relates to an anti-overflow device and cooking utensil for cooking utensil.

Background

Many cooking appliances such as electric cookers or electric pressure cookers currently on the market are usually provided with an anti-overflow detection device, so as to realize an anti-overflow function. However, the conventional anti-overflow detection device usually adopts two metal electrodes which are respectively connected with the control panel interface through leads, and this way has higher cost and higher misjudgment probability.

Accordingly, there is a need to provide an overflow prevention device for a cooking appliance and a cooking appliance to at least partially solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

In order to solve the above problems, an aspect of the present invention is to disclose a spill prevention device for a cooking appliance, the spill prevention device comprising:

a conductive probe comprising a detection end and a connection end, wherein a capacitance value of the conductive probe changes as the detection end approaches or contacts a medium in the cooking appliance; and

the control module is electrically connected with the conductive probe through the connecting end and judges whether the anti-overflow operation is performed or not according to the change of the capacitance value of the conductive probe,

wherein, the outer surface of the detection end is a spherical surface.

Preferably, the outer surface of the detection end is a whole spherical surface, a semi-spherical surface or an ellipsoidal surface.

Preferably, the anti-overflow device further comprises a detection circuit, the detection circuit is respectively electrically connected with the connection end and the control module, the detection circuit generates a detection signal by detecting a change in a capacitance value of the conductive probe, and the control module determines whether to perform the anti-overflow operation based on the detection signal.

Preferably, the overflow prevention device further comprises an isolation circuit for insulating and isolating the conductive probe.

Preferably, the isolation circuit comprises a power isolation circuit for isolating a power supply for supplying power to the detection circuit and/or a communication isolation circuit for isolating communication between the power supply and the detection circuit.

Preferably, the anti-overflow device still includes electric connecting part, electric connecting part include the inserted sheet and with the connecting wire that has the plug that the inserted sheet is connected, the inserted sheet with electrically conductive probe electricity is connected, the connecting wire with detection circuitry electricity is connected.

The utility model discloses still disclose a cooking utensil, cooking utensil includes:

a pot body; and

the cover body is arranged on the cooker body in an openable and closable manner and comprises a lining and an inner cover connected with the lining; and

the anti-overflow device is arranged on the cover body.

Preferably, the height H of the detection end of the conductive probe extending out of the inner cover satisfies the following conditions: h is more than or equal to 5.5mm and less than or equal to 13 mm.

Preferably, the area S of the outer surface of the conductive probe, from which the detection end protrudes out of the inner cover, satisfies: 189mm²≤S≤1062mm²。

Preferably, the cooking appliance further comprises a mounting member having a hollow cylindrical shape with one end provided with a flange extending radially outward, the flange being connected to the inner liner, and the other end of the mounting member being connected to the connection end.

Preferably, the mount is made of an electrically conductive material.

Preferably, the tab is electrically connected to the mount.

According to the utility model discloses an anti-overflow device and cooking utensil are through judging whether carry out the anti-overflow operation according to the capacitance value change of conductive probe, can improve sensitivity, can reduce cost simultaneously. In addition, the outer surface of the detection end of the conductive probe is set to be a spherical surface, so that the misjudgment probability can be reduced, the manufacture can be more convenient, and in addition, the installation and the disassembly of the conductive probe can be facilitated.

Drawings

The following figures of the embodiments of the present invention are used as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a schematic cross-sectional view of a portion of a cooking appliance according to a preferred embodiment of the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a flowchart of an anti-overflow control performed by the anti-overflow device according to a preferred embodiment of the present invention.

Fig. 4 is a schematic block diagram of a power isolation circuit and a communication isolation circuit according to a preferred embodiment of the present invention.

Fig. 5 is a schematic sectional view of a part of a cooking appliance according to another preferred embodiment of the present invention.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the invention are possible in addition to these detailed descriptions.

Fig. 1 is a schematic cross-sectional view of a cooking appliance provided with an overflow prevention device according to a preferred embodiment of the present invention. It can be understood, according to the utility model discloses a cooking utensil can be for electric rice cooker, electric pressure cooker, soybean milk machine or other cooking utensil, and according to the utility model discloses a cooking utensil except having the function of cooking rice, can also have various functions such as cooking congee, a kind of deep pot hot water, boiling soybean milk. The following describes in detail the cooking utensil and the overflow preventing device according to the present invention, taking an electric rice cooker as an example.

As shown in fig. 1, the cooking appliance 200 includes a pot body 210 and a lid 220. The pot body 210 has a cavity of a cylindrical shape for receiving the inner pot 212, and the inner pot 212 can be freely put into or taken out of the cavity to facilitate cleaning of the inner pot 212. The upper surface of the inner pot 212 has a circular opening for containing a material to be heated, such as rice, soup, etc., into the inner pot 212. The cover body 220 includes an inner liner 221 and an inner cover 222 detachably coupled to the inner liner 221. The pot body 210 generally has therein a heating means for heating the inner pot 212.

As shown in fig. 1 and 2, the cooking appliance 200 further includes a spill prevention device 100, and the spill prevention device 100 is provided in the cover 220. The detection principle of the anti-overflow device 100 according to the present invention is a capacitance sensing principle, that is, when the medium (such as foam) in the inner pan 212 of the cooking utensil 200 approaches or touches the detection component (such as the conductive probe 110 in the present application, which will be described in detail below) of the anti-overflow device, a capacitance value change thereof is caused, and such a change is converted into a detectable digital signal, so as to determine whether to perform the anti-overflow operation.

Specifically, as shown in fig. 1 and 2, the overfill prevention device 100 includes a conductive probe 110, a detection circuit electrically connected to the conductive probe 110, and a control module electrically connected to the detection circuit. The conductive probe 110 has a sensing end 111 and a connection end 112. The detecting end 111 of the conductive probe 110 is a portion extending into the inner pot 212 through the inner cover 222 to be contacted with the medium in the inner pot 212, and the connecting end 112 is connected to a detecting circuit.

According to the overflow preventing device 100 of the present embodiment, the capacitance value of the conductive probe 110 may be changed as the detecting end 111 approaches or contacts the medium in the cooking appliance 200, thereby forming a capacitive detecting device. When the medium in the cooking appliance 200 approaches or contacts the detection end 111, the capacitance value of the conductive probe 110 changes. The detection circuit is electrically connected to the conductive probe 110, and the detection circuit generates a detection signal by detecting a change in capacitance value of the conductive probe 110. The control module communicates with the detection circuit to receive the detection signal and determines whether an overflow phenomenon occurs in the inner pan 212 of the cooking appliance 200 according to the detection signal, thereby performing an overflow prevention operation.

In one embodiment, as shown in fig. 3, the detection circuit can detect the capacitance value of the conductive probe 110 in real time and convert the capacitance value into a corresponding digital semaphore. The control module acquires the digital semaphore of the detection circuit in real time, and stores and compares the digital semaphore acquired this time with the difference S between the digital semaphore acquired before and the digital semaphore acquired before. When the control module determines that the difference S is greater than a set threshold, the spill-proof control may be performed. The embodiment can reduce the misjudgment probability.

Referring back to fig. 1 and 2, in the present embodiment, the outer surface of the sensing end 111 of the conductive probe 110 is substantially a full sphere, and accordingly, the shape of the conductive probe 110 is substantially a sphere. Preferably, the conductive probe 110 is a solid or hollow member made of a conductive metal material. The outer surface of the detection end 111 of the conductive probe 110 is set to be a spherical surface, so that the conductive probe has a smooth outer surface, when foams are left on the detection end 111 of the conductive probe 110, the foams can slide along the spherical outer surface, foam adhesion is reduced, foam residue on the detection end 111 of the conductive probe 110 is avoided, misjudgment is caused, and misjudgment probability of anti-overflow detection is greatly reduced. Therefore, the overflow preventing device 100 for the cooking utensil 200 according to the embodiment of the present invention has the advantages of low probability of misjudgment, high sensitivity, etc.

In a preferred embodiment, as shown in fig. 2, the height H of the sensing end 111 of the conductive probe 110 extending beyond the inner cover 222 satisfies: h is less than or equal to 5.5mm and less than or equal to 13mm, and illustratively, the height H of the detection end 111 of the conductive probe 110 extending out of the inner cover 222 can be set to be 7mm, 8mm, 10mm and the like. Further preferably, the area S of the outer surface of the sensing end 111 of the conductive probe 110 protruding out of the inner cover 222 satisfies: 189mm²≤S≤1062mm². For example, in a preferred embodiment, the area S of the outer surface of the conductive probe 110 where the detection end 111 protrudes from the inner cover 222 may be set to 250mm²、300mm²、350mm²、400mm²、450mm²、500mm²、550mm²、600mm²、650mm²、900mm²And the like, and the skilled person can set the range according to actual needs.

Preferably, the overfill prevention device 100 further comprises a mount 120 for mounting the conductive probe 110 in the cooking appliance. The mounting member 120 is preferably a metal member made of an electrically conductive material, the mounting member 120 is substantially hollow cylindrical, and one end of the mounting member 120 is provided with a flange 121 extending radially outward, the flange 121 is connected to the inner lining 221, and the other end of the mounting member 120 is substantially matched in shape to the connection end 112 of the conductive probe 110, that is, is curved and connected to the connection end 112, thereby making the connection between the mounting member 120 and the connection end 112 tighter and more stable.

As shown in fig. 2, the overfill prevention device 100 further includes an electrical connection component 130 that connects the conductive probe 110 and the detection circuit. The electrical connection part 130 includes a blade 131 and a connection line 133 with a plug 132 connected to the blade 131. Preferably, the insert 131 is a metal piece made of an electrically conductive material. The blades 131 are inserted into the mounting member 120, the plug 132 is inserted into the blades 131, and the connecting wire 133 is electrically connected to the detection circuit. It is understood that in other embodiments not shown, welding, riveting, terminal plugging, screwing, etc. may be used to electrically connect the connecting wire 133 with the conductive probe 110.

To ensure safety in use, the overfill prevention device 100 further includes an isolation circuit that insulates the conductive probe 110 to avoid the risk of a user inadvertently touching the conductive probe 110 to create an electrical shock.

The isolation circuit comprises a power isolation circuit and/or a communication isolation circuit, the power isolation circuit isolates a power supply for supplying power to the detection circuit, and the communication isolation circuit isolates communication between the power supply and the detection circuit.

Specifically, the power supply may be isolated by a transformer, and the power supply isolation circuit is briefly described below by taking the transformer as an example with reference to fig. 4. Of course, other methods can be adopted by those skilled in the art according to actual needs.

A power panel of the cooking appliance supplies low-voltage direct current power to a DC-AC circuit on a display panel provided with a detection circuit, and the DC-AC circuit is composed of a switch power chip and peripheral circuits. Under the control of the DC-AC circuit, the electric energy of the primary coil of the transformer is coupled to the secondary coil of the transformer, and the primary coil and the secondary coil of the transformer are not grounded, so that the power supply isolation function is realized; then the voltage is passed through a rectifying circuit, a filter circuit, a three-terminal voltage-stabilizing integrated circuit and a filter circuit to finally obtain a 5V (or 3.3V) direct-current power supply, and the direct-current power supply is provided for a detection circuit.

The communication isolation circuit is used for isolating the communication between the display panel provided with the detection circuit and the power panel, and the isolation mode can adopt a photoelectric coupler or other modes.

In this way, the corresponding power and communication circuits on the display panel can be isolated, so that safety can be ensured when the user's hand directly touches the conductive probe 110.

In another embodiment, as shown in FIG. 5, the outer surface of the sensing end 111 of the conductive probe 110 is substantially hemispherical. The preferred embodiment can also reduce foam adhesion, and avoid misjudgment caused by residual foam on the conductive probe 110, thereby greatly reducing the misjudgment probability of the anti-overflow detection.

It is understood that in other embodiments not shown, the outer surface of the detecting end 111 may be an ellipsoid or a spherical surface with other shapes, which can be set by those skilled in the art according to actual needs.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims

1. A spill guard for a cooking appliance, the spill guard (100) comprising:

a conductive probe (110), the conductive probe (110) comprising a detection end (111) and a connection end (112), wherein a capacitance value of the conductive probe (110) changes as the detection end (111) approaches or contacts a medium in the cooking appliance; and

the control module is electrically connected with the conductive probe (110) through the connecting end (112) and judges whether the anti-overflow operation is performed or not according to the change of the capacitance value of the conductive probe (110),

wherein, the outer surface of the detection end (111) is a spherical surface.

2. The overfill prevention device of claim 1, wherein said outer surface of said detection end is a full spherical surface, a hemispherical surface, or an ellipsoidal surface.

3. The overfill prevention device of claim 1, wherein said overfill prevention device (100) further comprises a detection circuit, said detection circuit being electrically connected to said connection end (112) and said control module, respectively, said detection circuit generating a detection signal by detecting a change in capacitance of said conductive probe (110), said control module determining whether to perform said overfill prevention operation based on said detection signal.

4. The overfill prevention device of claim 3, wherein said overfill prevention device (100) further comprises an isolation circuit that insulates said conductive probe (110).

5. The overfill prevention device of claim 4, wherein said isolation circuit comprises a power isolation circuit that isolates a power source that powers said detection circuit and/or a communication isolation circuit that isolates communication between said power source and said detection circuit.

6. The overfill prevention device of claim 3, wherein said overfill prevention device (100) further comprises an electrical connection component (130), said electrical connection component (130) comprising a blade (131) and a connection line (133) with a plug (132) connected to said blade (131), said blade (131) being electrically connected to said conductive probe (110), said connection line (133) being electrically connected to said detection circuit.

7. A cooking appliance, characterized in that the cooking appliance (200) comprises:

a pot body (210); and

a lid body (220) openably and closably provided on the pot body (210), the lid body including a liner (221) and an inner lid (222) connected to the liner (221); and

the overfill prevention device (100) of any of claims 1-6, said overfill prevention device (100) being disposed on said cover (220).

8. The cooking appliance according to claim 7, wherein the height H of the detection end (111) of the conductive probe (110) protruding from the inner cover (222) satisfies: h is more than or equal to 5.5mm and less than or equal to 13 mm.

9. The cooking appliance according to claim 8, wherein the area S of the outer surface of the conductive probe (110) where the detection end (111) protrudes from the inner lid (222) satisfies: 189mm²≤S≤1062mm²。

10. The cooking appliance according to claim 7, wherein the cooking appliance (200) further comprises a mount (120), the mount (120) being in the shape of a hollow cylinder provided with a radially outwardly extending flange (121) at one end, the flange (121) being connected to the inner liner (221), the other end of the mount (120) being connected to the connection end (112).

11. The cooking appliance according to claim 10, wherein the mount (120) is made of an electrically conductive material.

12. The cooking appliance according to claim 11, wherein the overfill prevention device (100) comprises a detection circuit and an electrical connection component (130), the electrical connection component (130) comprising a blade (131) and a connection line (133) with a plug (132) connected to the blade (131), the connection line (133) being electrically connected to the detection circuit, the blade (131) being electrically connected to the mounting member (120).