Eddy current auxiliary heating household appliance

Abstract

The invention discloses an eddy current auxiliary heating household appliance. The electric cooker with the vortex-assisted heating function is provided with a solid graphene lining barrel, the side wall of the graphene lining barrel is wrapped by glass fiber woven cloth, an electric heating wire coil is wound outside the glass fiber woven cloth, a glass barrel covers the ceramic electric heating wire coil and the bottom of the graphene lining barrel, and a plastic shell is arranged outside the glass barrel. A round hole is formed in the center of the bottom of the graphene lining barrel and the center of the bottom of the glass barrel, and a magnetic core of a magnetic control switch is arranged in the round hole. Glass fiber woven cloth is wrapped outside the side wall of a stainless steel inner container of the vortex auxiliary heating stirrer, an electric heating wire coil is wound outside the glass fiber woven cloth, a glass barrel is covered outside the electric heating wire coil and outside the bottom of the stainless steel inner container, and a plastic shell is arranged outside the glass barrel. A small hole is formed in the center of the bottom of the stainless steel liner and the glass barrel; and a rotary blade is mounted on a rotary blade rotating shaft after upwards penetrating through the small holes in the centers of the bottom of the glass barrel and the stainless steel liner. And a plastic base is arranged below the plastic shell.

Description

Technical fields:

[0001] This invention relates to a household appliance with eddy current-assisted heating. Background technology:

[0002] An IH rice cooker uses electromagnetic heating to cook rice in a 202 stainless steel inner pot. Its principle is the same as a household induction cooker, using electronic components to convert 220-volt, 50Hz AC mains power into 2000Hz AC power. The electronic components used in IH rice cookers are prone to short circuits due to poor insulation in the humid environment of a kitchen. Because the frequency of an IH rice cooker is 2000Hz, the insulation material is easily broken down, leading to a short circuit. IH rice cookers cost over 1000 yuan, while ordinary rice cookers only cost a little over 100 yuan and are less likely to short-circuit in the humid kitchen environment.

[0003] Some people use a household blender to grind dried soybeans into powder, then put it into an electric kettle with some water. The electric kettle is plugged into a power outlet and the heating switch is pressed. During the process of cooking the soybean powder, the soybean powder dust goes to the bottom of the kettle. After heating, it turns into a paste that covers the bottom of the kettle. Then it is cooked into a paste and cannot be made into soy milk. Summary of the Invention:

[0004] A household appliance with eddy current-assisted heating. The rice cooker with eddy current-assisted heating has a solid graphene inner liner, the side walls of which are wrapped with fiberglass woven fabric. A heating wire coil is wound around the fiberglass woven fabric. A glass container covers the outside of the heating wire coil and the bottom of the graphene inner liner, and the glass container is covered with a plastic outer shell. A circular hole is located in the center of the bottom of the graphene inner liner and the glass container, and a magnetic core for a magnetic switch is installed inside the hole. The rice cooker with eddy current-assisted heating has a plastic lid and a metal inner pot.

[0005] A method for controlling an eddy current-assisted heating rice cooker. Rice and water are placed in the metal inner pot, which is then placed inside a graphene-lined container, and the lid is closed. The power plug of the eddy current-assisted heating rice cooker is plugged into a power outlet, and the cooking switch is pressed, allowing alternating current to flow through the heating coil. The alternating magnetic field generated by the heating coil induces eddy currents within the side wall of the metal inner pot, heating its side wall. Since the frequency of a medium-frequency induction furnace used in steelmaking is 100Hz, while the frequency of mains electricity is 50Hz, the electromagnetic induction eddy current heating power in this rice cooker is relatively low, and can only be used as auxiliary heating. The heat generated by the resistance of the heating coil after the alternating current is applied is transferred to the bottom of the metal inner pot through the graphene-lined container. Graphene's specific heat is only one-tenth that of copper, resulting in very high heat transfer efficiency. Traditional rice cookers exceeding 1 kilowatt watts often result in undercooked rice because the heating plate only heats the bottom of the inner pot. This leads to the rice at the bottom becoming burnt while the rice at the top remains uncooked. However, the eddy current-assisted heating rice cooker of this invention heats not only the bottom of the metal inner pot but also its side walls simultaneously. Even a 1 kilowatt rice cooker using this invention will not produce undercooked rice. After the rice is cooked, the temperature at the bottom of the metal inner pot exceeds 102°C, triggering the magnetic switch. 220V AC current then flows through a resistor or diode into the heating coil, reducing the coil's power to one-quarter, thus keeping the rice inside the inner pot warm.

[0006] A household appliance with eddy current-assisted heating. The stainless steel inner liner of the eddy current-assisted heating stirrer is wrapped with fiberglass woven fabric on the outside, and an electric heating wire coil is wound around the fiberglass woven fabric. A glass bucket is covered outside the electric heating wire coil and the bottom of the stainless steel inner liner, and the glass bucket is covered with a plastic outer shell. A small hole is located in the center of the bottom of the stainless steel inner liner and the glass bucket. The rotating blade shaft passes upward through the small hole in the bottom of the glass bucket and the bottom of the stainless steel inner liner and is then installed. A plastic base is located under the plastic outer shell, and a motor control switch and a heating control switch are located on the plastic base. The stirrer motor is installed inside the plastic base, and the stirrer motor shaft is connected to the rotating blade shaft via a movable coupling. The bottom of the plastic casing has three concentric brass tubes that connect to the neutral wire of the heating coil, the 100°C bimetallic switch, and the stainless steel inner liner, respectively. A wire from the 100°C bimetallic switch connects to the 80°C bimetallic switch and a diode. A wire from the other end of the 80°C bimetallic switch and the diode, connected together, connects to the live wire of the heating coil. The 100°C and 80°C bimetallic switches are attached to the bottom of the stainless steel inner liner. The top of the plastic base has three concentric ring grooves that mate with the three concentric brass tubes on the bottom of the plastic casing. There are two clips on the bottom edge of the plastic casing, and two slots on the top of the plastic base mate with the two clips on the bottom edge of the plastic casing. Limit switches are located in the two slots on the top of the plastic base, and each of the three concentric ring grooves on the top of the plastic base contains a spring contact. The power cord connects to the 110°C bimetallic switch via a heating knob switch, a limit switch, and a contact on the brass tube ring groove. The power cord also connects to the live wire of the stirrer motor via a motor knob switch and another limit switch. The plastic outer shell has a plastic handle on the side wall, and the vortex-assisted heating stirrer has a plastic lid.

[0007] Control method for a vortex-assisted heating stirrer: Place soaked soybeans and water into the stainless steel inner pot, then cover with a plastic lid. Hold the handle and place the stirring pot containing the soybeans and water onto the plastic base. Rotate the stirring pot until the two concentric brass tubes at the bottom of the outer shell insert into the two concentric ring grooves at the top of the plastic base. The stirrer motor shaft is connected to the rotating blade shaft via a movable coupling. The two clips on the bottom edge of the plastic outer shell are inserted into the two slots at the top of the plastic base. Rotate the stirring pot until you hear a click, indicating the limit switch is activated. Plug the power cord of the vortex-assisted heating stirrer into a power outlet. Turn the motor knob to the high-speed setting. The power cord connects to the high-speed live wire of the stirrer motor via a switching mechanism. The stirrer motor drives the rotating blades to rotate at high speed, chopping the soybeans. Turn the motor knob to the low-speed setting. The power cord connects to the low-speed live wire of the stirrer motor via a switching mechanism. The stirrer motor drives the rotating blades to rotate at low speed, evenly mixing the soybean powder. Turning the heating knob to the open position connects the power cord to the heating wire coil via another limit switch, contacts, a brass tube, a 100°C bimetallic switch, an 80°C bimetallic switch, and the live wire. The heating wire coil receives 220 volts of AC power. The alternating magnetic field generated by the heating wire coil induces eddy currents in the stainless steel inner wall, heating the inner wall. Since the frequency of the medium-frequency induction furnace used in steelmaking is 100Hz, while the mains frequency is 50Hz, the electromagnetic induction eddy current heating of the stirrer in this invention has relatively low power and can only be used as auxiliary heating. The heat generated by the AC power flowing through the resistance of the heating wire coil heats the soybean powder and water inside the stainless steel inner wall. Once the temperature of the stainless steel inner wall exceeds 80°C, the 80°C bimetallic switch opens. The current from the 100°C bimetallic switch is rectified by a diode and then enters the live wire of the heating wire coil, reducing the output power of the heating wire coil to only one-quarter. If the soy milk burns or the pot burns and becomes too dry, the bimetallic switch will trip when the stainless steel inner pot temperature exceeds 100°C. Once the soy milk is cooked, turn the motor knob to the stop position to stop the rotating blades. Turn the heating knob to the off position to stop the heating coil from heating the stainless steel inner pot. In existing soy milk makers, the stirrer and heating element are mounted on a plastic lid. When soybeans are placed in a stainless steel mesh bag, the stirrer blades and heating element are easily damaged. However, the eddy current-assisted heating stirrer in this invention heats the side wall of the stainless steel inner pot after being powered on, and the stirrer motor drives the rotating blades to rotate at high speed, making them less prone to damage. The rotating blades are easy to clean. Pour some water into the stainless steel inner pot, grab the handle, and place the mixing pot containing soybeans and water into the plastic base. Rotate the mixing pot so that the two concentric brass tubes at the bottom of the outer shell are inserted into the two concentric ring grooves at the top of the plastic base. The mixer motor shaft is connected to the rotating blade shaft through a movable coupling. The two clips on the bottom edge of the plastic outer shell are inserted into the two slots at the top of the plastic base. Rotate the mixing pot until you hear a click, indicating that the limit switch is activated.Turn the rotary switch to the high speed setting. The mixer motor will drive the rotating blades to rotate, cleaning the yellow rotating blades and the stainless steel inner tank. Attached image description:

[0008] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0009] Figure 1 This is a schematic diagram of the structure of the rice cooker with eddy current assisted heating in this invention.

[0010] Figure 2 This is a schematic diagram of the stirrer structure with eddy current assisted heating in this invention. Detailed implementation method:

[0011] Figure 1 The image shows a household appliance with eddy current assisted heating. The rice cooker with eddy current assisted heating has a solid graphene inner liner 2, the side walls of which are wrapped with fiberglass woven fabric 3, and a heating wire coil 4 is wound around the fiberglass woven fabric 3. A glass container 5 covers the outside of the heating wire coil 4 and the bottom of the graphene inner liner 2, and the glass container 5 is covered with a plastic outer shell 6. A circular hole is located at the center of the bottom of the graphene inner liner 2 and the glass container 5, and the magnetic core of a magnetic control switch 7 is installed inside the hole. The rice cooker with eddy current assisted heating also has a plastic lid 8 and a metal inner pot 1.

[0012] Figure 1The following describes the control method for a rice cooker with eddy current-assisted heating. Rice and water are placed in the metal inner pot 1, and then the metal inner pot 1 containing rice and water is placed inside the graphene-lined container 2. The lid 8 is then closed. The power plug of the rice cooker with eddy current-assisted heating is plugged into a power outlet, and the cooking switch is pressed, allowing alternating current to flow through the heating coil 4. The alternating magnetic field generated by the heating coil 4 induces eddy currents in the side wall of the metal inner pot 2, heating the side wall of the metal inner pot 1. Since the frequency of a medium-frequency induction furnace used in steelmaking is 100Hz, while the frequency of mains electricity is 50Hz, the electromagnetic induction eddy current heating power of the rice cooker with eddy current-assisted heating in this invention is relatively small, and electromagnetic induction eddy current heating can only be used as auxiliary heating. The heat generated by the resistance of the heating coil 4 after the alternating current is applied is transferred to the bottom of the metal inner pot 1 through the graphene-lined container 2. Graphene has a specific heat capacity only one-tenth that of copper, so its heat transfer efficiency is very high. Traditional rice cookers exceeding one kilowatt often result in undercooked rice because the heating plate only heats the bottom of the inner pot. The rice at the bottom becomes burnt while the rice at the top remains uncooked. However, the eddy current-assisted heating rice cooker of this invention heats not only the bottom of the metal inner pot 1 but also its side walls simultaneously. Even a one-kilowatt rice cooker using this invention will not produce undercooked rice. After the rice is cooked, the temperature at the bottom of the metal inner pot 1 exceeds 102°C, triggering the magnetic core of the magnetic switch 12. 220V AC current then flows through a resistor or diode into the heating coil 4. The heating coil 4's power is reduced to one-quarter, effectively keeping the rice inside the metal inner pot 1 warm.

[0013] Figure 2The diagram shows a household appliance with eddy current-assisted heating. The stainless steel inner liner 9 of the eddy current-assisted heating stirrer has a glass fiber woven fabric 3 wrapped around its side walls. An electric heating wire coil 4 is wound around the glass fiber woven fabric 3. A glass tub 5 covers the outside of the electric heating wire coil 4 and the bottom of the stainless steel inner liner 9. A plastic outer shell 6 covers the glass tub 5. A small hole is located at the center of the bottom of the stainless steel inner liner 9 and the glass tub 5. A rotating blade 10 is mounted on the rotating shaft after passing through the small hole at the bottom of the glass tub 5 and the bottom of the stainless steel inner liner 9. A plastic base 11 is located below the plastic outer shell 6. A motor rotary switch and a heating rotary switch are located on the plastic base 11. The stirrer motor is installed inside the plastic base 11, and the stirrer motor shaft is connected to the rotating shaft of the rotating blade 10 via a movable coupling. The bottom of the plastic casing 6 has three concentric brass tubes that connect to the neutral wire of the heating coil 4, the 100°C bimetallic switch, and the stainless steel inner liner 9, respectively. A wire from the 100°C bimetallic switch connects to the 80°C bimetallic switch and a diode. A wire from the other end of the 80°C bimetallic switch and the diode connects to the live wire of the heating coil 4. The 100°C and 80°C bimetallic switches are attached to the bottom of the stainless steel inner liner 9. The top of the plastic base 11 has three concentric ring grooves that fit into the three concentric brass tubes on the bottom of the plastic casing 6. The bottom edge of the plastic casing 6 has two clips, and the top of the plastic base 11 has two slots that fit into the two clips on the bottom edge of the plastic casing 6. Limit switches are located in the two slots on the top of the plastic base 11, and each of the three concentric ring grooves on the top of the plastic base 11 contains a spring contact. The power cord connects to the 110°C bimetallic switch via a heating rotary switch, a limit switch, and a contact on the brass tube ring groove. The power cord is connected to the stirrer motor's live wire via a motor rotary switch and another limit switch. The plastic casing 6 has plastic handles 12 on its side walls, and the stirrer with eddy current-assisted heating has a plastic lid 8.

[0014] Figure 2The following describes the control method for the eddy current assisted heating stirrer. Soaked soybeans and water are placed in the stainless steel inner pot 9, and then the plastic lid 8 is placed on top. Holding the handle 12, the stirrer containing the soybeans and water in the stainless steel inner pot 9 is placed on the plastic base 11. The stirrer is rotated so that the two concentric brass tubes at the bottom of the outer shell 6 are inserted into the two concentric ring grooves at the top of the plastic base 11. The stirrer motor shaft is connected to the rotating blade 10 shaft via a movable coupling. Two clips on the bottom edge of the plastic shell 6 are inserted into the two slots at the top of the plastic base 11. The stirrer is rotated until a clicking sound is heard, indicating that the limit switch is activated. The power plug of the eddy current assisted heating stirrer is plugged into a power outlet. The motor knob switch is turned to the high-speed setting. The power cord is connected to the high-speed live wire of the stirrer motor through a forming switch. The stirrer motor drives the rotating blade 10 to rotate at high speed, chopping the soybeans. The motor knob switch is turned to the low-speed setting. The power cord is connected to the low-speed live wire of the stirrer motor through a forming switch. The stirrer motor drives the rotating blade 10 to rotate at low speed, evenly stirring the soy milk. Turning the heating knob to the open position connects the power cord to the live wire of the heating wire coil 4 via another limit switch, contacts, a brass tube, a 100°C bimetallic switch, an 80°C bimetallic switch, and the contact wire of the heating wire coil 4. A 220-volt AC current flows through the heating wire coil 4. The alternating magnetic field generated by the heating wire coil 4 induces eddy currents in the side wall of the stainless steel inner liner 9, heating the side wall of the stainless steel inner liner 9. Since the frequency of the medium-frequency electric furnace used in steelmaking is 100Hz, while the frequency of the mains electricity is 50Hz, the electromagnetic induction eddy current heating of the stirrer in this invention has relatively low power; electromagnetic induction eddy current heating can only be used as auxiliary heating. The heat generated by the AC current flowing through the resistance of the heating wire coil 4 heats the soybean powder and water inside the stainless steel inner liner 19. Once the temperature of the stainless steel inner liner 9 exceeds 80°C, the 80°C bimetallic switch opens. The current from the 100°C bimetallic switch is rectified by a diode and then enters the live wire of the heating wire coil 4, reducing the output power of the heating wire coil 4 to only one-quarter. If the soy milk burns or boils dry, the bimetallic switch will trip when the stainless steel inner pot 9 exceeds 100°C. Once the soy milk is cooked, turn the motor knob to the stop position to stop the rotating blade 10. Turn the heating knob to the off position to stop the heating coil 4 from heating the stainless steel inner pot 9. In existing soy milk makers, the stirrer and heating element are mounted on the plastic lid 8. When soybeans are placed in a stainless steel mesh bag, the stirrer blades and heating element are easily damaged. However, the eddy current-assisted heating stirrer in this invention heats the side wall of the stainless steel inner pot 9 after being powered on, and the stirrer motor drives the rotating blade 10 to rotate at high speed, making it less prone to damage.The rotating blade 10 is easy to clean. Pour some water into the stainless steel inner pot 9, grasp the handle 12, and place the mixing pot containing soybeans and water into the plastic base 11. Rotate the mixing pot so that the two concentric brass tubes at the bottom of the outer shell 6 are inserted into the two concentric ring grooves at the top of the plastic base 11. The agitator motor shaft is connected to the rotating blade 10 shaft via a movable coupling. The two clips on the bottom edge of the plastic shell 6 are inserted into the two slots at the top of the plastic base 11. Rotate the mixing pot until you hear a click, indicating that the limit switch is activated. Turn the rotary switch to the high-speed setting. The agitator motor will drive the rotating blade 10 to rotate, cleaning the rotating blade 10 and the stainless steel inner pot.

Claims

1. A household electrical appliance with vortex-assisted heating, characterized in that: The electric rice cooker with eddy current auxiliary heating has a solid graphene lining barrel (2), the outer wall of the graphene lining barrel (2) is wrapped with glass fiber woven cloth (3), the outer wall of the glass fiber woven cloth (3) is wound with electric heating wire coil (4), the outer wall of the electric heating wire coil (4) and the outer wall of the bottom of the graphene lining barrel (2) are covered with glass barrel (5), the outer wall of the glass barrel (5) is wrapped with plastic shell (6), a circular hole is formed in the central position of the bottom of the graphene lining barrel (2) and the glass barrel (5), and the magnetic core of the magnetic control switch (7) is arranged in the circular hole.

2. A household electrical appliance with vortex-assisted heating, characterized in that: The electric rice cooker with eddy current auxiliary heating has a solid graphene lining barrel (2), the outer wall of the graphene lining barrel (2) is wrapped with glass fiber woven cloth (3), the outer wall of the glass fiber woven cloth (3) is wound with electric heating wire coil (4), the outer wall of the electric heating wire coil (4) and the outer wall of the bottom of the graphene lining barrel (2) are covered with glass barrel (5), the outer wall of the glass barrel (5) is wrapped with plastic shell (6), a circular hole is formed in the central position of the bottom of the graphene lining barrel (2) and the glass barrel (5), and the magnetic core of the magnetic control switch (7) is arranged in the circular hole.

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