A thin electric hot plate for a silent kettle

Abstract

A thin electric heating plate for a silent kettle includes a heating element and a heating plate. The heating plate is an integrated electric heater, comprising a metal heating plate body and a heating element. The heating element is welded to the surface of a metal plate or integrally cast. The integrally cast electric heater encloses the heating element inside the heating plate body by metal casting or die casting. The thickness of the metal heating plate body is 3-4mm, and the power of the metal heating plate body is 1-2Kw. The thickness of the metal heating plate body is 4-8mm, and the power of the metal heating plate body is 2-4Kw.

Description

Technical Field

[0001] This utility model relates to a heating plate for kitchen appliances, and especially a thin, castable heating plate for silent kettles. Background Technology

[0002] CN636575Y discloses a heating plate for a split-type electric frying pan or electric hot pot, solving the problems of short lifespan and low thermal efficiency of the heating element in existing hot pots, and the inseparability of the pot body and heating element. The heating plate includes a heating element and a heating tube, with the heating tube entirely cast and embedded within the heating element, which is made of cast iron, aluminum, or stainless steel, forming an integral heating plate. Existing heating plates for split-type electric frying pans or electric hot pots use high-temperature resistant, fully enclosed ohmic heating tubes, which have advantages such as waterproofing, safety, non-weathering, non-peeling, long service life, rapid heating, and high thermal efficiency. The use of cast iron further improves thermal efficiency. The pot body and heating plate can be separated, making it convenient to use and carry. This heating plate can use an insert-type thermostat, allowing for arbitrary temperature adjustment. It automatically cuts off power when the temperature exceeds the set temperature, providing protection. The heating plate is sturdy, durable, safe, and reliable, and its insulation meets national standards. Figure 2 A typical heating plate of the prior art is given, where 1 is an electric heating element, 2 is a cast metal, and 3 is an electrical plug. However, this type of heating plate requires a thermostat, and the temperature sensor is installed in the center of the heating plate. A recessed hole must be left in the center of the heating plate to install the temperature sensor. Existing heating plates do not take this into account, resulting in a significant impact on the temperature sensor when a high-power heating plate is working. The temperature sensor should be sensing the temperature of the water container at the top, but because the space in the recessed hole in the center of the heating plate is too small, it is easily affected by the heat conducted by the heating plate. Therefore, a temperature signal of 100°C will be transmitted before the water temperature in the container reaches 100°C, and a signal to stop heating will be generated by the thermostat before the water boils.

[0003] CN2023219260749 is a low-noise kettle proposed by the applicant. Its main innovation is the micro-nano structure on the kettle body that holds water. However, in practical applications, the structure of the heating plate also needs to be considered at the same time.

[0004] Because existing heating plates are generally made of aluminum, cast iron, or stainless steel, cast onto the heating element, and the water container sits on the heating plate, proper temperature control is required to achieve quiet operation of the kettle and higher precision temperature control, which is the task of this application. The applicant's CN2025214115362 describes a cast heating plate for a quiet kettle, including a heating element and a heating plate. The heating plate is an integrated electric heater, comprising a metal heating plate body and a heating element. The heating element is completely enclosed inside the metal heating plate body by casting or die casting, and the heating element connector is located outside the aluminum base. The heating surface of the heating element is 100% in contact with the metal heating plate body. The aluminum heating plate body has a flat top and several mounting bosses at the bottom, with a rectangular or circular groove for placing a temperature sensor. The temperature sensor is used to detect the temperature of the kettle above the plate. However, it does not consider a mechanism for quiet operation of the heating plate. Utility Model Content

[0005] The purpose of this utility model is to solve the shortcomings of the temperature control accuracy of existing heating plates and the silent heating of silent kettles, and to provide a casting-type electric heating plate for silent kettles, especially a casting-type electric heating plate for kettles and silent kettles.

[0006] The technical solution of this utility model is a thin electric heating plate for a silent kettle, comprising a heating element and a heating plate. The heating plate is an integrated electric heater, including a metal heating plate body and a heating element (electric heating tube). The heating element is welded to the surface of a metal plate or integrally cast. For integrally cast electric heaters, the heating element is enclosed or semi-enclosed inside the heating plate body by metal casting or die casting. The thickness of the metal heating plate body is 3-4 mm, and the power of the metal heating plate body is 1-2 kW. Alternatively, the thickness of the metal heating plate body is 4-8 mm, and the power of the metal heating plate body is 2-4 kW. The heating plate body is a metal plate, especially an aluminum plate, but copper, iron, etc., are also acceptable.

[0007] Furthermore, the center of the integrally cast heating plate is a rectangular or circular groove, and the geometric center of the groove is used to install a temperature sensor.

[0008] Furthermore, the heating element in the disc-shaped cast electric heating plate has the following shape: the heating element is coiled into a ring or anchor shape, and the upper straight handle of the anchor shape is the plug end of the heating element.

[0009] Furthermore, the heating plate has a power of 1.5Kw and a thickness of 3.5-4mm.

[0010] The top of the metal heating plate is flat.

[0011] The heating element structure is existing technology; commonly used heating elements are welded together with an aluminum block (aluminum plate) (see...). Figure 3When the heating plate is made of a metal plate, the relationship between the heating plate thickness, electrical power, and noise level refers to the thickness of the aluminum block (aluminum plate), excluding the thickness of the heating element itself. Alternatively, it can be integrally cast, with the heating element embedded in a plate made of cast iron, aluminum, or stainless steel, forming a single, integrated heating plate. In this case, the thickness must be slightly higher or lower than the diameter of the heating element; the former requires the fabrication of a smaller diameter heating element. Heating plates with a thickness slightly lower than the diameter of the heating element are perfectly usable and are also the subject of this application. All of these demonstrate that the heating plate in this application is a thin plate.

[0012] The heating plate of this invention is a thin plate. The local oscillation frequency of the heating plate is basically inversely proportional to the thickness t of the plate: the smaller the thickness, the higher the local oscillation frequency. Since the size of the heating plate is fixed, there is a relationship between the power of the heating plate and its thickness and volume. Because existing kettles produce low-frequency (100-300Hz) sound when the gas escapes from the water when heated to approximately 80-95℃, the local oscillation frequency of the existing heating plate is relatively close to this, which amplifies this frequency of sound. The local oscillation frequency of this invention is higher, thus overcoming the problem of amplified noise from hot water.

[0013] Beneficial effects: The heating plate of this utility model can use a high-temperature resistant, fully enclosed ohmic heating tube, which is waterproof, safe, has a long service life, heats up quickly, and has high thermal efficiency; the water container and the heating plate can be separated or integrated, making it convenient to use and carry; the temperature sensor of the cast-in-place heating plate is easy to install, facilitating accurate and reliable thermostat and temperature control, and automatically shuts off when the kettle reaches 100℃ (primarily when heating water); the square, round, or extended grooves ensure accurate temperature sensing, and the low-frequency 100-300Hz sound generated by gas escaping from the water is not affected by resonance, greatly reducing noise when heating to close to 80-95℃. The applicant's actual testing has proven this noise reduction (using the dimensional parameters of the embodiment); it reduces the noise of the kettle when heating to higher temperatures, saving some casting metal and costs. In the embodiment, with a 1500W / 3.5mm aluminum plate, the highest noise measured within half a meter when heating to 100℃ does not exceed 50 decibels, and with a 4mm aluminum plate, it does not exceed 55 decibels. Attached Figure Description

[0014] Figure 1 This is a plan view of a heating plate structure;

[0015] Figure 2 for Figure 1 A further improved plan view of this utility model;

[0016] Figure 3 This is a three-dimensional view of the heating plate structure of this utility model; additional components such as sensors and plugs are not shown. Detailed Implementation

[0017] Example 1: As Figure 3 The heating plate is an integrated electric heater, comprising a metal heating plate body and heating elements (electric heating tubes). The heating elements are welded to the surface of a metal plate. The thickness of the metal heating plate body (metal plate) is 3-4.5mm, and its power is 1-2Kw. Alternatively, the thickness of the metal heating plate body (metal plate) can be 4.5-8mm, and its power is 2-4Kw. The metal plate is aluminum plate 1, and the aluminum plate heating elements (electric heating tubes) are welded using vacuum brazing or gas-shielded welding. For 1500W / 3.5mm, the noise level is good, reaching below 55 decibels; with a 4mm thickness, it can reach 50 decibels. For 2500W, the aluminum plate thickness is required to be 4-4.5mm; for 3000W, the aluminum plate thickness is 4.5-6mm, and can even reach 8mm.

[0018] Example 2: Integral Cast Electric Heater. This heater encloses the heating element within a heating plate body using metal casting or die casting. It includes a planar cast iron, aluminum, or stainless steel heating plate body 1 and a heating element 2. The high-temperature resistant heating element is entirely embedded in molten aluminum at 750℃ or cast iron at 1300℃, forming the metal (aluminum or cast iron) heating plate body 1. This makes the heating element and the cast iron heating element form an integral heating plate. The figure shows the two electrical connection leads 3 of the heating element 2. The heating plate is an integrated electric heater, including the metal (aluminum or cast iron) heating plate body and the heating element. The heating element is completely enclosed within the metal (aluminum) heating plate body using casting or die casting, with the heating element connector located outside the aluminum base. The heating surface of the heating element is 100% in contact with the aluminum heating plate body. The heating element is not U-shaped; its cross-section is circular, trapezoidal, rectangular, or flat. The top of the aluminum heating plate body is planar and has a rectangular or circular groove 7 as a placement hole for the temperature sensor 6. Temperature sensor 6 is used to detect the temperature of the kettle on the upper part of the plate; the heating element has its connector placed at the bottom of the aluminum heating plate or around the perimeter of the aluminum heating plate. The heating element connector is either bent downwards or straight.

[0019] Figure 1 , 2 The heating element is a single, integrated unit consisting of two Ω-shaped coils connected together. Its noise reduction effect is slightly less than that of a metal plate structure.

[0020] Heating element 2 is a complete heating element consisting of two Ω-shaped coils connected as one piece, located in the middle of the outer Ω-shaped heating element. The heating element has a smaller diameter, with an inner heating wire filled with insulating ceramic material that has a certain thermal conductivity; the diameter is 3.5-5mm.

[0021] The metal heating plate 1 in the example above can be made into an arc shape. This heating plate can be placed in a split heating base and used as a heating plate for various pots. The surface of the heating plate can be made into a flat shape or an arc shape.

[0022] Example 3: Heating tube and casting metal: The heating tube is completely cast and embedded in a cast iron, aluminum or stainless steel plate, so that the heating tube, cast iron or aluminum or stainless steel heating plate form an integral heating plate; the center of the heating plate is a rectangular or circular groove 7.

[0023] A typical heating element (material can be SUS304) has a diameter of approximately 90-120mm, operates at 120-250V and 1000-2000W, and its insulation strength test conditions are 1500V / 0.5mA / 2s with an insulation resistance of 50MΩ / 500V / 60s. The surface of the heating element is sandblasted. A cast heating element is a heating element manufactured through a casting process, typically consisting of an electric heating tube and casting material. The heating element usually uses a heating tube, such as one made of nickel-chromium alloy or iron-chromium-aluminum alloy, which has good conductivity and heating performance, converting electrical energy into heat energy. PTC elements and electric heating film components are also used as heating elements. Commonly used casting materials include aluminum alloy and cast iron. Aluminum alloy has advantages such as good thermal conductivity, light weight, and corrosion resistance, but its high-temperature range is limited; cast iron has high strength and wear resistance, providing good protection and support for the heating element, while also aiding in heat conduction. Stainless steel can also be used, but its thermal conductivity is poor. A power socket is used to connect the two electrical leads of the heating element, providing power to the electric heating plate. An insulation layer can be installed around the heating plate to reduce heat loss and improve thermal efficiency. The working principle of the cast heating plate is based on the thermal effect of electric current. When current passes through the heating element, due to the element's resistance, electrical energy is converted into heat energy, raising the element's temperature. Then, the heat is conducted to the object to be heated through the casting material, thus achieving the heating purpose.

[0024] Example 4: The heating element in the disc-shaped cast electric heating plate has the following shape: the heating element is coiled into an anchor shape, and the straight handle at the upper end of the anchor shape is the plug end of the heating element.

[0025] Example 5: The present invention is used to prepare a thin electric heating plate for a silent kettle. This application is particularly applicable to heating plates for electric kettles and silent kettles; it can also be used as a heating plate for dishwashers.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thin electric hot plate for a silent kettle, characterized in that The device includes a heating element and a heating plate. The heating plate is an integrated electric heater, comprising a metal heating plate body and a heating element. The heating element is welded to the surface of a metal plate or cast integrally. The integrally cast electric heater uses metal casting or die casting to enclose or semi-enclose the heating element inside the heating plate body. The thickness of the metal heating plate body is 3-4mm, and the power of the metal heating plate body is 1-2Kw. The thickness of the metal heating plate body is 4-8mm, and the power of the metal heating plate body is 2-4Kw.

2. The thin electric hot plate for a silent kettle according to claim 1, wherein The heating plate has a rectangular or circular groove in the center, and the geometric center of the groove is used to install a temperature sensor.

3. The thin electric heating plate for a silent kettle according to claim 1 or 2, characterized in that, The heating element in a disc-shaped cast-in-place electric heating plate has the following shape: the heating element is coiled into a ring or anchor shape, and the upper straight handle of the anchor shape is the plug end of the heating element.

4. The thin electric hot plate for a mute kettle according to any one of claims 1 to 2, characterized by, The heating plate has a power of 1.5Kw and a thickness of 3.5-4mm.

5. The thin electric heating plate for a silent kettle according to claim 1 or 2, characterized in that, The top of the metal heating plate is flat.

Images