A rice cooker anti-dry burning sensor

Abstract

The present invention provides an electric rice cooker anti-dry-burn sensor, which includes a heating plate installed at the bottom inside the electric rice cooker and provided with a heating wire in front, a stepped hole provided in the middle of the heating plate, a pressure column slidably installed in the large end of the stepped hole, a spring 1 installed in the large hole of the stepped hole, a temperature-sensitive magnetic steel inserted in the middle of the pressure column, and the bottom of the temperature-sensitive magnetic steel exposed at the bottom of the pressure column, the bottom of the temperature-sensitive magnetic steel inserted in the inner side of the spring 1 and extended to the inside of the small end of the stepped hole, a contact point 1 and a contact point 2 provided on the side of the stepped hole, a contact piece for connecting the contact point 1 and the contact point 2 provided on the side of the temperature-sensitive magnetic steel, a spring 2 installed in the small end of the stepped hole, a push-type switch assembly provided below the heating plate, the free end of the push-type switch assembly hingedly connected to a magnet inserted in the inner side of the spring 2 and located in the small end of the stepped hole. The present invention solves the safety risk of maintaining low-power continuous heating due to unplugging the power supply.

Description

Technical Field

[0001] The invention relates to the field of household appliance anti-dry-burning safety components, in particular to an energy-saving electric rice cooker anti-dry-burning sensor. Background Art

[0002] The cooking principle of a traditional rice cooker is as follows: 1. The boiling point of water at standard atmospheric pressure is 100°C. When cooking, if there is water in the pot, the temperature will remain stable. Once the water evaporates, the temperature will rise. 2. Certain magnetic materials have a Curie point. When the material reaches a certain critical temperature, the magnetism disappears, and when the temperature drops, the magnetism returns. Traditional rice cookers utilize these two principles to achieve their cooking function.

[0003] The anti-dry-burning structure of traditional rice cookers is generally plugged in to the power supply. At this time, there is a resistor in the circuit (the heating wire in the heating plate used for insulation). The rice cooker heats at low power to make the temperature in the pot reach and maintain it within the range of 60-80℃. It works regardless of whether the inner pot is in or whether rice is being cooked. This wastes a lot of electricity. At the same time, some elderly people or children are prone to burns when their hands accidentally touch the inner cavity of the rice cooker, which poses certain safety risks. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art. Therefore, an energy-saving and safe rice cooker anti-dry-burning sensor is proposed. The inner pot body is heated only after it is placed in, reducing energy consumption. At the same time, it can also avoid the safety risks caused by maintaining low-power continuous heating when the power is not unplugged.

[0005] An electric rice cooker dry-burning prevention sensor comprises a heating plate installed at the bottom inner side of the electric rice cooker and provided with a heating wire in front, a stepped hole provided in the middle of the heating plate, a pressure column slidably installed in the large end of the stepped hole, a first spring installed in the large hole of the stepped hole, a temperature-sensitive magnetic steel inserted in the middle of the pressure column, the bottom of the temperature-sensitive magnetic steel exposed at the bottom of the pressure column, the bottom of the temperature-sensitive magnetic steel inserted in the inner side of the first spring and extending to the interior of the small end of the stepped hole, a first contact point and a second contact point provided on the side of the stepped hole, a contact piece for connecting the first contact point and the second contact point provided on the side of the temperature-sensitive magnetic steel, a second spring installed in the small end of the stepped hole, a push-type switch assembly provided below the heating plate, and a magnet hingedly connected to the free end of the push-type switch assembly and inserted in the inner side of the second spring and located in the small end of the stepped hole.

[0006] When the inner pot body is not put in, the rice cooker will not operate with low-power heating. When the inner pot body is put in, the inner pot body will press down the pressure column to compress spring one, and the contact piece will connect the circuit for low-power heating operation, thereby making the rice cooker operate with low power. This can save energy and reduce consumption, and at the same time eliminate the safety hazards of traditional structures. The push-type switch component can compress spring two upward and magnetize the temperature-sensitive magnet steel by overcoming the elastic force of spring two. Finally, the two are in a stable adsorption state. When cooking is completed, the temperature of the inner pot body will exceed 103°C, causing the temperature-sensitive magnet steel to lose its magnetism, and then spring two will reset the magnet. At the same time, the push-type switch component of the rice cooker is reset from the cooking position to the keep-warm position for keeping warm.

[0007] In a further technical solution, the push-type switch assembly includes a push-type switch component installed on the side of the rice cooker, the push-type switch component is hinged to a connecting rod 2 through a connecting rod 1, the connecting rod 2 is rotatably installed on the rice cooker shell at the bottom of the heating plate, and a pressure structure for closing the main circuit is provided on the connecting rod 2, and the free end of the connecting rod 2 is hinged to the bottom of the magnet.

[0008] In a further technical solution, the anti-dry burning sensor also includes an insulation circuit, which includes a insulation lamp, a secondary heating wire, contact point one, and contact point two embedded in the heating plate, and the secondary heating wire, contact point one, contact point two, contact piece, insulation lamp and power supply are connected via wires to form an insulation closed loop.

[0009] In a further technical solution, the anti-dry burning sensor also includes a cooking circuit, which includes a switch controlled by a pressure structure, a heating lamp, and a main heating wire embedded in the heating plate. The three are connected to the power supply via wires to form a closed cooking circuit.

[0010] In a further technical solution, the pressure post and the temperature-sensing magnet are threaded together. The pressure post is made of a heat-insulating material, and the top of the pressure post is lower than the top of the temperature-sensing magnet, with a distance of 1-2 mm between the two. The heat-insulating material of the pressure post prevents the interior of the stepped hole from being exposed to high temperatures, ensuring that contact points 1 and 2, as well as the contact piece, remain in contact or disconnected during normal operation, and also ensuring that the temperature of the temperature-sensing magnet and the inner pot body are nearly consistent.

[0011] In a further technical solution, the contact piece includes a conductor embedded in the side of the pressure column. The conductor has an overall U-shaped structure with a circular cross-section. Both ends of the guide body are provided with an outward expansion section. The elastic body and the contact body are inserted into the inner portion of the outward expansion section. The end of the outward expansion section is provided with an inner opening to limit the end position of the contact body. The flexible installation of the contact body and the conductor through the elastic body facilitates the transition between the pressure column working positions while ensuring electrical connectivity between the conductor and the contact body.

[0012] In a further technical solution, a guide groove adapted to the contact body is provided on the inner wall of the large end of the stepped hole, and two inward-retracted terminals are provided on the guide groove, and the two terminals correspond to contact point one and contact point two respectively. The contact body can be guided up and down along the guide groove, so that the temperature-sensitive magnet can run up and down stably, avoiding abnormal noise caused by shaking left and right, and eliminating the contact void phenomenon of contact point one, contact point two and contact piece that is easily caused by shaking.

[0013] In a further technical solution, when the push-button switch component is pressed down to the cooking station, the push-button switch component drives the magnet upward through connecting rod one and connecting rod two, and at the same time, the pressure structure closes the switch to close the cooking circuit. During the upward movement of the magnet, it will first overcome the elastic force of spring two and then magnetize the temperature-sensitive magnetic steel, and the two are adsorbed to form a stable structure; when cooking is completed, the temperature of the temperature-sensitive magnetic steel exceeds the Curie point and loses its magnetism, and the magnet is reset under the action of spring two, and at the same time, the pressure structure controls the switch to be disconnected, and the push-button switch component is reset from the cooking station to the heat preservation station.

[0014] During use, the power supply is first turned on, and the inner pot body is placed inside the rice cooker. The pressure column will be pressed down first and the spring 1 will be compressed. As the pressure column moves downward, the two contact bodies are used to connect the heat preservation closed circuit with the contact point 1 and the contact point 2 via the conductor during the downward movement, so that the rice cooker can perform low-power heating operation. Then, the press switch component is pressed down from the heat preservation position to the cooking position, and the connecting rod 1 drives the connecting rod 2 to close the switch via the pressure structure, so that the cooking closed circuit is closed. At the same time, the free end of the connecting rod 2 drives the magnet upward to overcome the elastic force of the spring 2, magnetize the temperature-sensitive magnetic steel and absorb it with the temperature-sensitive magnetic steel to form a stable structure, and cook together with the heat preservation closed circuit. When cooking is completed, the temperature-sensitive magnetic steel loses its magnetism after exceeding 103°C. At this time, the elastic force of the spring 2 will reset the magnet, the connecting rod 1, and the press switch component to keep warm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but rather the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0016] Figure 1 1 is a schematic diagram of the overall structure of the rice cooker anti-dry-burning sensor according to one embodiment of the present invention in a non-working condition;

[0017] Figure 2 1 is a schematic diagram of the overall structure of the rice cooker anti-dry-burning sensor according to one embodiment of the present invention under the heat preservation working condition;

[0018] Figure 3 1. It is a schematic diagram of the overall structure of the rice cooker anti-dry-burning sensor according to one embodiment of the present invention under cooking conditions;

[0019] Figure 4 It is a schematic diagram of a partial enlarged view of a stepped hole of an electric rice cooker anti-dry-burning sensor according to an embodiment of the present invention under a cooking condition;

[0020] Figure 5 yes Figure 4 A partial enlarged schematic diagram;

[0021] Figure 6 yes Figure 5 Schematic diagram of a partial enlarged view of the middle contact piece.

[0022] Description of reference numerals:

[0023] 20. Heating plate; 30. Stepped hole; 40. Pressure column; 50. Spring 1; 60. Temperature-sensitive magnet; 70. Contact point 1; 80. Contact point 2; 90. Contact piece; 91. Conductor; 92. Outward expansion section; 93. Elastomer; 94. Contact body; 95. Inner opening; 100. Spring 2; 110. Press switch; 120. Connecting rod 1; 130. Connecting rod 2; 140. Pressure structure; 150. Magnet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] The "first" and "second" in the present invention do not represent specific quantities and orders, but are only used to distinguish names.

[0028] like Figures 1 to 6As shown, an electric rice cooker anti-dry burning sensor in one embodiment of the present invention comprises a heating plate 20 installed at the bottom inside the electric rice cooker and provided with a heating wire 10 in front, a stepped hole 30 is provided in the middle portion of the heating plate 20, and a pressure column 40 is slidably installed in the large end of the stepped hole 30, a spring 50 is installed inside the large hole of the stepped hole 30, a temperature-sensitive magnetic steel 60 is socketed in the middle portion of the pressure column 40, and the bottom of the temperature-sensitive magnetic steel 60 is exposed to the bottom of the pressure column 40, the pressure column 40 and the temperature-sensitive magnetic steel 60 are threadedly connected, the pressure column 40 is made of a heat-insulating material, and the top of the pressure column 40 is lower than the top of the temperature-sensitive magnetic steel 60, and the distance between the two is 1-2mm. The temperature-sensitive magnet 60 loses its magnetism when the temperature is higher than 103°C. When the inner pot body is not placed in the rice cooker, the spring 1 50 will push the pressure column 40 and the temperature-sensitive magnet 60 to the highest position. When the inner pot body is placed in the rice cooker, the spring 1 50 will be compressed by the pressure column 40 to the lowest position of the spring pressure column 40.

[0029] The bottom of the temperature-sensitive magnetic steel 60 is inserted into the inner side of spring 1 50 and extends into the interior of the small end of the stepped hole 30. Contact points 1 and 2 are provided on the side of the stepped hole 30. A contact piece 90 is provided on the side of the temperature-sensitive magnetic steel 60 for connecting contact points 1 and 2. Contact piece 90 includes a conductor 91 embedded in the side of the pressure column 40. Conductor 91 has an overall U-shaped structure with a circular cross-section. Both ends of the guide body are provided with an outward expansion section 92. An elastic body 93 (spring) and a contact body 94 are inserted into the interior of the outward expansion section 92. The end of the outward expansion section 92 is provided with an inward constriction 95 to limit the final position of the contact body 94. A guide groove is provided on the inner wall of the large end of the stepped hole 30, which is adapted for the contact body 94. The guide groove is equipped with two inwardly constricted terminals, one corresponding to contact point 1 and the other to contact point 2. The contact body 94 is always in contact with the conductor 91 and is also made of a conductive material.

[0030] The anti-dry-heat sensor's insulation circuit includes a heat lamp, a secondary heating wire embedded within the heating plate 20, contact points 1 and 2, a contact piece 90, the heat lamp, and a power source connected via wires to form a closed insulation circuit. When the rice cooker is placed inside the rice cooker, contact piece 90 connects the closed insulation circuit, illuminating the heat lamp.

[0031] When the pressure column 40 and the temperature-sensing magnet are at their lowest position, the two contact bodies 94 come into contact, respectively, at contact points 1 and 2, connecting the closed insulation circuit and enabling operation. When the pot is removed, the pressure column 40 and the temperature-sensing magnet 60, under the action of spring 1 50, move to the top, causing the contact body 94 to first compress the elastic body 93 and separate from the corresponding contact point, then ascend along the guide groove to the highest position, disconnecting the closed insulation circuit. This saves energy and reduces consumption, while also eliminating the safety risk of continuous low-power heating when the power is not unplugged.

[0032] A spring 2 100 is installed inside the small head of the stepped hole 30, and a push-type switch assembly is provided under the heating plate 20. The push-type switch assembly includes a push-type switch part 110 installed on the side of the rice cooker. The push-type switch part 110 is hinged to a connecting rod 2 130 through a connecting rod 1 120. The connecting rod 2 130 is rotatably installed on the rice cooker shell at the bottom of the heating plate 20. A pressure structure 140 for closing the main circuit is provided on the connecting rod 2 130. The free end of the push-type switch assembly is hinged to a magnet 150 that is socketed on the inner side of the spring 2 100 and located inside the small head of the stepped hole 30. Specifically, the free end of the connecting rod 2 130 is hinged to the bottom of the magnet 150.

[0033] The cooking circuit of the anti-dry-burning sensor includes a switch controlled by the pressure structure 140, a heating lamp, and a primary heating wire embedded in the heating plate 20. The three are connected to the power supply via wires to form a closed circuit for cooking.

[0034] When the switch member 110 is pressed down to the cooking position, the switch member 110 drives the magnet 150 upward through the connecting rod 120 and the connecting rod 2 130, and the pressure structure 140 closes the switch to close the cooking circuit. During the upward movement, the magnet 150 will first overcome the elastic force of the spring 2 100 and then magnetize the temperature-sensitive magnetic steel 60, and the two are adsorbed to form a stable structure; when cooking is completed, the temperature-sensitive magnetic steel 60 loses its magnetism when the temperature exceeds the Curie point (103°C), and the magnet 150 is reset under the action of the spring 2 100. At the same time, the pressure structure 140 controls the switch to be disconnected, and the switch member 110 is reset from the cooking position to the heat preservation position.

[0035] When in use, first turn on the power, place the inner pot body inside the rice cooker, and first press the pressure column 40 and compress the spring 1 50. As the pressure column 40 moves downward, the two contact bodies 94 are used to connect the heat preservation closed circuit with the contact point 1 and the contact point 2 through the conductor 91 during the downward movement, so that the rice cooker can perform low-power heating operation. Then, the press switch 110 is pressed from the heat preservation position to the cooking position, and the connecting rod 120 drives the connecting rod 2 130 through the pressure structure 140 to switch The cooking circuit is closed, and at the same time, the free end of the connecting rod 2 130 drives the magnet 150 upward to overcome the elastic force of the spring 2 100, magnetizes the temperature-sensitive magnetic steel 60 and adsorbs it to form a stable structure, and cooks together with the heat preservation closed circuit. When cooking is completed, the temperature-sensitive magnetic steel 60 exceeds 103°C and loses its magnetism. At this time, the elastic force of the spring 2 100 will reset the magnet 150, the connecting rod 1 120, and the push-type switch 110 to keep warm.

[0036] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A rice cooker anti-dry burning sensor, characterized in that: A rice cooker anti-dry burning sensor is characterized in that it comprises a heating plate (20) which is installed at the bottom inside the rice cooker and is provided with a heating wire in front, a stepped hole (30) is provided in the middle of the heating plate (20), a pressure column (40) is slidably installed in the large end of the stepped hole (30), a spring (50) is installed inside the large hole of the stepped hole (30), a temperature-sensitive magnetic steel (60) is inserted in the middle of the pressure column (40), and the bottom of the temperature-sensitive magnetic steel (60) is exposed at the bottom of the pressure column (40), and the bottom of the temperature-sensitive magnetic steel (60) is inserted in the spring (50). (50) and extends to the inside of the small head of the stepped hole (30), the side of the stepped hole (30) is provided with a contact point 1 and a contact point 2, the side of the temperature-sensitive magnetic steel (60) is provided with a contact piece (90) for connecting the contact point 1 and the contact point 2, the small head of the stepped hole (30) is installed with a spring 2 (100), and a push-type switch assembly is provided below the heating plate (20), and the free end of the push-type switch assembly is hinged with a magnet (150) that is inserted into the inner side of the spring 2 (100) and located inside the small head of the stepped hole (30); The push-type switch assembly comprises a push-type switch component (110) mounted on the side of the electric rice cooker, the push-type switch component (110) being hinged to a second connecting rod (130) via a first connecting rod (120), the second connecting rod (130) being rotatably mounted on the electric rice cooker housing at the bottom of the heating plate (20), a pressure structure (140) for closing the main circuit being provided on the second connecting rod (130), and a free end of the second connecting rod (130) being hinged to the bottom of the magnet (150); The anti-dry-burning sensor further comprises a heat preservation circuit, the heat preservation circuit comprising a heat preservation lamp, a secondary heating wire embedded in the heating plate (20), a contact point 1, a contact point 2, the secondary heating wire, the contact point 1, the contact point 2, the contact sheet (90), the heat preservation lamp and a power supply connected via a wire to form a heat preservation closed loop; The anti-dry-burning sensor also includes a cooking circuit, which includes a switch controlled by a pressure structure (140), a heating lamp, and a primary heating wire embedded in the heating plate (20), the three being connected to a power source via a wire to form a closed circuit for cooking; The contact piece (90) includes a conductor (91) embedded in the side of the pressure column (40), the conductor (91) is a U-shaped structure as a whole, and the cross section of the conductor (91) is a circular ring structure. Both ends of the guide body are provided with an outward expansion section (92), the interior of the outward expansion section (92) is socketed with an elastic body (93) and a contact body (94), and an inner closing opening (95) for limiting the final position of the contact body (94) is provided at the end of the outward expansion section (92).

2. The rice cooker anti-dry burning sensor according to claim 1, characterized in that: The pressure column (40) and the temperature-sensitive magnetic steel (60) are threadedly connected. The pressure column (40) is made of heat-insulating material and the top of the pressure column (40) is lower than the top of the temperature-sensitive magnetic steel (60). The distance between the two is 1mm-2mm.

3. The rice cooker anti-dry burning sensor according to claim 1, characterized in that: A guide groove adapted to the contact body (94) is provided on the inner wall of the large end of the stepped hole (30), and two inwardly retracted terminals are provided on the guide groove, the two terminals corresponding to contact point one and contact point two respectively.

4. The rice cooker anti-dry burning sensor according to claim 1, characterized in that: When the push switch component (110) is pressed down to the cooking station, the push switch component (110) drives the magnet (150) upward through the connecting rod 1 (120) and the connecting rod 2 (130), and at the same time, the pressure structure (140) closes the switch to close the cooking circuit. During the upward movement, the magnet (150) first overcomes the elastic force of the spring 2 (100) and then magnetizes the temperature-sensitive magnetic steel (60), and the two are adsorbed to form a stable structure; when cooking is completed, the temperature-sensitive magnetic steel (60) loses its magnetism due to the temperature exceeding the Curie point, and the magnet (150) is reset under the action of the spring 2 (100). At the same time, the pressure structure (140) controls the switch to be disconnected, and the push switch component (110) is reset from the cooking station to the heat preservation station.

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