Graphene far infrared heating dry-wet dual-purpose heat preservation buffet stove

Abstract

The utility model relates to the technical field of dining stove, concretely is a kind of graphene far infrared heating dry-wet dual-purpose heat preservation self-service dining stove, including shell and graphene heating coating, the shell top is rotatably installed with lid by hydraulic hinge, the lid front end is fixedly installed with handle;The shell bottom is connected with bottom cover;Shell inside is fixedly installed with water basin, food basin is placed in the water basin top;Temperature sensor is installed in the water basin inner wall one side, and the temperature sensor detection end is attached with the water basin inner wall;Microcrystalline panel is laid in the water basin inner wall bottom, the utility model: support dry-wet dual-purpose, strong adaptability: water basin can be flexibly selected to add water or not to add water, when adding water, steam can be generated to keep moisture for food with less moisture (such as cakes, roast meat), when not adding water, the food with much soup (such as thick soup, stewed dishes) can avoid the influence of taste due to condensed water drop, and adapt to the demand of different moisture content dishes.

Description

Technical Field

[0001] This utility model relates to the field of kitchen stove technology, specifically a graphene far-infrared heating dual-purpose dry and wet heat-insulating self-service kitchen stove. Background Technology

[0002] Existing buffet ovens, in practical applications, suffer from several technical defects due to limitations in heating methods and structural design, making it difficult to meet the requirements for efficient, flexible, and safe heat preservation. Specific problems are as follows: Insufficient heating efficiency and uniformity: Traditional buffet ovens mostly use resistance wire heating or hot air circulation heating. Resistance wire heating is prone to "local overheating", which causes the food near the heating element to be too hot and have a poor taste, while the food further away is not hot enough and cannot achieve the ideal heat preservation effect. Hot air circulation heating has the problems of large heat loss and low heat conversion efficiency, resulting in high energy consumption costs in the long run.

[0003] Limited heat preservation modes and poor adaptability: Most devices only support a single heat preservation mode. If the food has little moisture (such as sausages, pastries, and fried eggs), not adding water for heat preservation will easily lead to moisture loss and dryness. If the food has a lot of broth (such as thick soups, stews, and braised dishes), adding water for heat preservation will produce a lot of condensation. The condensation will drip into the food, diluting the broth and ruining the taste. It cannot adapt to the needs of dishes with different moisture contents. Summary of the Invention

[0004] The purpose of this invention is to provide a graphene far-infrared heating dual-purpose dry and wet heat-insulating buffet stove to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A graphene far-infrared heating dual-purpose dry and wet heat-insulating buffet stove includes a shell and a graphene heating coating. A lid is rotatably mounted on the top of the shell via a hydraulic hinge, and a handle is fixedly mounted on the front end of the lid. The bottom of the shell is connected to a bottom cover; a water basin is fixedly installed inside the shell, and a food basin is placed on top of the water basin. A temperature sensor is installed on one side of the inner wall of the basin, and the detection end of the temperature sensor is in contact with the inner wall of the basin. The bottom of the inner wall of the basin is covered with a microcrystalline panel, and the edge of the microcrystalline panel is filled with high-temperature glass glue between the inner wall of the basin. The bottom of the graphene heating coating is bonded with a mica sheet; The bottom of the mica sheet is covered with heat-insulating cotton; The bottom of the insulation cotton is provided with an insulation cotton pressure plate, which is fixed to the inner wall of the housing by screws; The heat insulation cotton and the heat insulation cotton pressure plate have coaxial through holes at the corresponding coating terminal positions. A ceramic insulator is embedded in the through hole, and a wire is passed through the ceramic insulator. One end of the wire is connected to the graphene heating coating, and the other end is connected to the control circuit board. A control circuit board is fixedly installed in the middle of the bottom cover; the control circuit board is electrically connected to the power supply interface, power switch, control panel and cooling fan respectively; The power supply interface and power switch are fixedly installed at the rear end of the housing; the control panel is fixedly installed at the front end of the housing; the cooling fan consists of two sets of silent axial flow fans, symmetrically installed on both sides of the bottom cover near the control circuit board, and the bottom cover has heat dissipation holes with dustproof meshes at the fan positions.

[0006] In a preferred embodiment of this utility model, a rubber sealing gasket is provided between the bottom cover and the housing, and anti-slip feet are fixedly installed at the four corners of the bottom of the bottom cover.

[0007] In a preferred embodiment of this utility model, the bottom of the water basin is provided with a drain hole with a rubber plug.

[0008] In a preferred embodiment of this utility model, the shell is made of cold-rolled steel plate, and the outer surface is treated with 80-100μm thick electrostatic powder coating, and the corners of the shell are rounded.

[0009] In a preferred embodiment of this utility model, the wires, temperature sensor wires, power supply interface wires, power switch wires, and cooling fan wires are all reliably connected to the corresponding interfaces of the control circuit board.

[0010] In a preferred embodiment of this utility model, an insulation cotton layer is adhered to the inner side of the cover, and a stainless steel sheet is covered on the outside of the insulation cotton layer.

[0011] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0012] Highly efficient and uniform heating: The graphene heating coating generates far-infrared radiation heating. Far-infrared rays have strong penetrating power, which can make the food evenly heated inside and out, avoiding local overheating or insufficient temperature. In addition, graphene has high heat conversion efficiency, which is more energy-efficient than traditional resistance wire and hot air circulation heating.

[0013] Supports both dry and wet use, with strong adaptability: the water basin can be flexibly selected to add water or not. When water is added, it can generate steam to moisturize foods with low moisture content (such as pastries and roasted meats). When water is not added, it can prevent foods with high broth content (such as thick soups and stews) from having condensation dripping down and affecting their taste. It is suitable for dishes with different moisture content.

[0014] High safety performance: Mica sheets provide insulation and isolation between the graphene heating coating and other components, while heat insulation cotton blocks heat conduction to the electrical control area. Combined with the over-temperature protection module (over-temperature power-off alarm) on the control circuit board, it can prevent leakage, component overheating damage, and user burns; the high-temperature glass glue has strong temperature resistance and is not prone to aging and cracking with long-term use, ensuring a sealing and waterproof effect.

[0015] Durable and easy to maintain: The shell is made of cold-rolled steel plate with electrostatic powder coating, and the water basin and food basin are made of 304 stainless steel, which is wear-resistant and corrosion-resistant; the water basin is equipped with a drain hole, the component connection structure is stable, cleaning and daily maintenance are convenient, and the service life of the equipment is extended. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 A graphene far-infrared heating dual-purpose dry and wet heat preservation buffet stove with three-dimensional heating Figure 1 ; Figure 2 A side view of a graphene far-infrared heating dual-purpose (dry and wet) insulated buffet stove; Figure 3 A cross-sectional view of a graphene far-infrared heating dual-purpose (dry and wet) insulated buffet stove; Figure 4 A graphene far-infrared heating dual-purpose wet and dry heat preservation buffet stove Figure 3 Enlarged view of area A in the middle; Figure 5 An explosion diagram of a graphene far-infrared heating dual-purpose (dry and wet) insulated buffet stove; Figure 6 A graphene far-infrared heating dual-purpose dry and wet heat preservation buffet stove with three-dimensional heating Figure 2 .

[0017] In the diagram: 1. Housing; 2. Bottom cover; 3. Anti-slip feet; 4. Hydraulic hinge; 5. Lid; 6. Handle; 7. Food bowl; 8. Water bowl; 9. Temperature sensor; 10. Microcrystalline panel; 11. High-temperature glass glue; 12. Graphene heating coating; 13. Mica sheet; 14. Heat insulation cotton; 15. Heat insulation cotton pressure plate; 16. Ceramic insulator; 17. Wire; 18. Control circuit board; 19. Power supply interface; 20. Power switch; 21. Control panel; 22. Cooling fan. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Please refer to Figure 1-6 A graphene far-infrared heating dual-purpose wet and dry heat-preserving buffet stove is disclosed. It includes a shell 1 and a graphene heating coating 12. A cover 5 is rotatably mounted on the top of the shell 1 via a hydraulic hinge 4. A handle 6 with a silicone anti-slip sleeve is fixedly mounted on the front end of the cover 5. The movable end of the hydraulic hinge 4 is fixedly connected to the rear end of the cover 5, enabling the cover 5 to flip open and close around the top of the shell 1. The hydraulic hinge 4 also has a slow-closing function to prevent the cover 5 from closing too quickly and causing collision damage. The outer surface of the handle 6 is covered with a silicone anti-slip sleeve for easy gripping and opening / closing of the cover 5.

[0020] The bottom of the housing 1 is connected to the bottom cover 2 by a combination of buckles and screws; a 304 stainless steel water basin 8 is fixedly installed inside the housing 1 by a ring bracket, and a 304 stainless steel food bowl 7 with an arc-shaped handle is movably placed on top of the water basin 8; the water basin 8 is made of 304 stainless steel and the inner wall is polished for easy cleaning and corrosion resistance; the food bowl 7 is movably placed at the top opening of the water basin 8. The food bowl 7 is also made of 304 stainless steel, and the outer diameter of the food bowl 7 is slightly smaller than the inner diameter of the water basin 8 to ensure that the food bowl 7 can be stably placed inside the water basin 8, while also making it easy to remove for washing or changing food. A temperature sensor 9 made of NTC thermistor material is fixedly installed on one side of the inner wall of the water basin 8 by screws. The detection end of the temperature sensor 9 is in contact with the inner wall of the water basin 8, and its signal wire passes through the wire hole with a sealing sleeve on the side wall of the water basin 8. The temperature sensor 9 is an NTC thermistor sensor, and its detection end is in close contact with the inner wall of the water basin 8 to ensure accurate detection of the temperature of the water basin 8 (indirectly reflecting the temperature of the food in the food basin 7). The signal wire of the temperature sensor 9 passes through the wire hole (with a sealing sleeve in the hole) on the side wall of the water basin 8 and is connected to the control circuit board 18. The microcrystalline panel 10 is made of high temperature resistant tempered glass material, which has good thermal conductivity and insulation. The high temperature glass glue 11 has a temperature resistance range of ≥300℃, and forms a sealing layer after curing, realizing the sealed connection between the microcrystalline panel 10 and the inner wall of the water basin 8, preventing water in the water basin 8 from seeping into the heating area below the microcrystalline panel 10. The bottom of the inner wall of the water basin 8 is covered with a microcrystalline panel 10 made of high temperature resistant and tempered glass. The edge of the microcrystalline panel 10 and the inner wall of the water basin 8 are filled with high temperature glass glue 11 with a temperature resistance of ≥300℃. There is no heat-generating coating in the 2-3cm area at the edge of the microcrystalline panel 10. The bottom non-edge area of ​​the microcrystalline panel 10 is coated with a 0.1-0.2mm thick graphene heating coating 12 by a spraying process. The coating is formed into positive and negative terminals by silver paste printing and tin plating on both sides. The bottom of the graphene heating coating 12 is bonded with a 0.8mm thick mica sheet 13 using high-temperature resistant epoxy adhesive. The bottom non-edge area of ​​the microcrystalline panel 10 is uniformly coated with the graphene heating coating 12 using a spraying process. The graphene heating coating 12 has a thickness of 0.1-0.2mm, and positive and negative terminals are formed on both sides of the coating using silver paste printing. The terminals are tin-plated to enhance conductivity and oxidation resistance. The bottom of the graphene heating coating 12 is bonded with a 0.8mm thick mica sheet 13 using high-temperature resistant epoxy adhesive. The mica sheet 13 completely covers the graphene heating coating 12, providing electrical insulation and heat insulation to prevent current leakage and block some heat conduction downwards. The bottom of the mica sheet 13 is covered with a 10mm thick aluminum silicate fiber insulation cotton 14; The bottom of the insulation cotton 14 is provided with a metal insulation cotton pressure plate 15, which is fixed to the protruding bracket on the inner wall of the housing 1 by screws. The heat insulation cotton 14 and the heat insulation cotton pressure plate 15 have coaxial through holes at the corresponding coating terminal positions. A ceramic insulator 16 is embedded in the through hole, and a high-temperature resistant wire 17 is threaded through the ceramic insulator 16. One end of the wire 17 is welded to the coating terminal and the welding point is wrapped with insulating tape, and the other end is connected to the control circuit board 18. The heat insulation cotton 14 can effectively block heat from being conducted to the electrical control area at the bottom of the housing 1. The heat insulation cotton pressure plate 15 is made of metal and is fixedly installed on the protruding bracket on the inner wall of the housing 1 with screws to press and fix the heat insulation cotton 14 and prevent the heat insulation cotton 14 from shifting when the equipment is moved. The inner diameter of the ceramic insulator 16 matches the outer diameter of the wire 17 and is used to insulate and protect the wire 17. A control circuit board 18 is fixedly installed on the raised platform in the middle of the bottom cover 2 by screws. The circuit board integrates an MCU main control chip, a temperature control module, a power management module, and an over-temperature protection module. The control circuit board 18 is electrically connected to the power supply interface 19, the power switch 20, the control panel 21, and the cooling fan 22. The power supply interface 19 uses a standard three-hole socket or a Type-C interface and is fixedly installed in the reserved hole on the left side of the rear end of the housing 1 for connecting to an external 220V AC power supply. The power switch 20 is a rocker switch and is fixedly installed on the right side of the rear end of the housing 1, close to the power supply interface 19, for easy operation of the device start and stop by the user. The control panel 21 is fixedly installed in the middle of the front end of the housing 1. The control panel 21 is equipped with an LCD display screen (for displaying the current temperature, set temperature, and working mode) and three physical buttons ("Power / Confirm", "Temperature +", and "Temperature -" respectively). The user can set the heat preservation temperature through the buttons (the setting range is 50-90℃). The cooling fan 22 is a silent axial flow fan, with two fans, symmetrically installed on both sides of the bottom cover 2 near the control circuit board 18. The bottom cover 2 has circular heat dissipation holes (with dustproof mesh inside) corresponding to the cooling fan 22 positions for heat dissipation of the control circuit board 18 to prevent the electronic control components from failing due to high temperature. A rubber sealing gasket is provided between the bottom cover 2 and the housing 1. The four corners of the bottom of the bottom cover 2 are fixed with anti-slip silicone feet 3 with anti-slip texture by glue. The rubber sealing gasket between the bottom cover 2 and the housing 1 prevents dust and moisture from entering the interior of the housing 1. The anti-slip feet 3 are made of high elastic silicone material and have cross anti-slip texture on the bottom. They can enhance the stability of the equipment when it is placed and prevent it from sliding. They can also play a shock absorption and cushioning role when the equipment is placed, avoiding direct collision with the table and generating noise. The bottom of the water basin 8 is provided with a drain hole with a rubber plug; The shell 1 is made of cold-rolled steel plate, and the outer surface is treated with 80-100μm thick electrostatic powder coating. The corners of the shell 1 are rounded.

[0021] The wires 17, 9 (temperature sensor), 19 (power supply interface), 20 (power switch), and 22 (cooling fan) are all reliably connected to the corresponding interfaces of the control circuit board 18. The inner side of the cover 5 is bonded with a 5mm thick layer of thermal insulation cotton, and the outer side of the thermal insulation cotton layer is covered with a thin stainless steel plate. The working principle of this utility model is as follows: Power supply and startup: Connect an external 220V AC power supply through the power supply interface 19, press the power switch 20 at the rear of the housing 1, the control circuit board 18 is powered on and initialized, the LCD display of the control panel 21 lights up, showing the current temperature of the water basin 8 (initially the ambient temperature), and the device enters standby mode.

[0022] Temperature setting and heating start: The user sets the target heat preservation temperature (e.g., 75℃) through the "Temperature+" and "Temperature-" buttons on the control panel 21. After pressing the "Power / Confirm" button, the control circuit board 18 receives the instruction and outputs current to the positive and negative poles of the graphene heating coating 12. After the graphene heating coating 12 is powered on, it quickly generates far-infrared rays based on the high thermal conductivity and far-infrared radiation characteristics of graphene. The far-infrared rays are directly radiated to the food bowl 7 through the microcrystalline panel 10 to heat the food in the bowl. Because far-infrared rays have penetrating properties, the food can be heated evenly inside and out, avoiding local overheating.

[0023] Temperature control: Temperature sensor 9 detects the inner wall temperature of the water basin 8 in real time and converts the temperature signal into an electrical signal to feed back to the control circuit board 18; when the detected temperature reaches the set temperature, the temperature control module of the control circuit board 18 cuts off the power supply to the graphene heating coating 12 and stops heating; when the detected temperature is lower than the set temperature (difference ≥ 5℃), the control circuit board 18 reconnects the power supply and starts heating; this cycle is repeated to achieve constant temperature preservation of the food, and the temperature control accuracy can reach ±2℃.

[0024] Dry / wet mode switching: Humidity Insulation Mode: Suitable for dishes with low moisture content (such as roasted chicken wings, egg tarts, and fried rice). To operate, first open lid 5, remove the food bowl 7, add an appropriate amount of water to the water bowl 8 (the water level should not exceed 1 / 3 of the height of the water bowl 8), then place the food bowl 7 containing the food into the water bowl 8, close lid 5, and set the temperature according to the standard procedure. The heat generated by the graphene heating coating 12 will slowly heat the water in the water bowl 8, producing a small amount of steam. This steam fills the interior of the casing 1, maintaining the moisture of the food and preventing it from drying out. Simultaneously, the steam temperature matches the set temperature, ensuring no impact on the taste of the dish.

[0025] Dry-state heat preservation mode: Suitable for dishes with a lot of broth (such as tomato beef brisket, hot and sour soup, and boiled fish). During operation, do not add water to the water basin 8. Directly place the food bowl 7 containing the dish into the water basin 8, close the lid 5, and set the temperature. At this time, the graphene heating coating 12 heats the food bowl 7 only through far-infrared radiation. The shell 1 does not generate a large amount of steam, avoiding condensation and preventing condensation from dripping into the dish and diluting the broth, thus preserving the original taste of the dish.

[0026] Security protection mechanism: Over-temperature protection: When the equipment malfunctions (such as the temperature sensor 9 failing or the heating circuit malfunctioning) and the temperature of the water basin 8 exceeds 100°C, the over-temperature protection module of the control circuit board 18 will immediately cut off the power supply to the heating circuit. At the same time, the display screen of the control panel 21 will show the "E1" fault code and trigger the buzzer to emit a continuous alarm sound to remind the user to disconnect the power and check, so as to prevent equipment damage or safety accidents.

[0027] Insulation protection: The mica sheet 13 can effectively isolate the graphene heating coating 12 from the heat insulation cotton 14 below, prevent current leakage, and prevent the casing 1 from becoming electrified; the ceramic insulator 16 provides insulation protection for the power supply wire 17, further preventing the risk of leakage.

[0028] Thermal insulation protection: The thermal insulation cotton 14 can block the heat generated by the graphene heating coating 12 from being conducted to the electrical control area, preventing the control circuit board 18 from aging due to high temperature; the cooling fan 22 runs continuously when the equipment is working, and exhausts the heat of the electrical control area through the heat dissipation holes of the bottom cover 2, ensuring that the circuit board temperature is stable within a safe range (≤60℃).

[0029] Scalding protection: The outer surface of the shell 1 is treated with electrostatic powder coating and has an internal heat insulation structure. When the device is working, the surface temperature of the shell is ≤40℃, which can prevent users from being burned by touching it; the slow-closing function of the cover 5 can prevent the cover 5 from closing quickly and pinching fingers; the silicone sleeve of the handle 6 can insulate heat and prevent burns when holding it.

[0030] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A graphene far-infrared heating dual-purpose wet and dry heat-insulating buffet stove, comprising a shell (1) and a graphene heating coating (12), characterized in that: The top of the housing (1) is rotatably mounted with a cover (5) via a hydraulic hinge (4), and a handle (6) is fixedly mounted on the front end of the cover (5). The bottom of the shell (1) is connected to a bottom cover (2); a water basin (8) is fixedly installed inside the shell (1), and a food basin (7) is placed on top of the water basin (8); A temperature sensor (9) is installed on one side of the inner wall of the water basin (8), and the detection end of the temperature sensor (9) is in contact with the inner wall of the water basin (8). The bottom of the inner wall of the basin (8) is covered with a microcrystalline panel (10), and the edge of the microcrystalline panel (10) is filled with high-temperature glass glue (11) between the inner wall of the basin (8). The graphene heating coating (12) has a mica sheet (13) bonded to the bottom. The bottom of the mica sheet (13) is covered with heat insulation cotton (14); The bottom of the insulation cotton (14) is provided with an insulation cotton pressure plate (15), which is fixed to the inner wall of the housing (1) by screws; The heat insulation cotton (14) and the heat insulation cotton pressure plate (15) are provided with coaxial through holes at the corresponding coating terminal positions. A ceramic insulator (16) is embedded in the through hole. A wire (17) is passed through the ceramic insulator (16). One end of the wire (17) is connected to the graphene heating coating (12), and the other end is connected to the control circuit board (18). A control circuit board (18) is fixedly installed in the middle of the bottom cover (2); the control circuit board (18) is electrically connected to the power supply interface (19), the power switch (20), the control panel (21) and the cooling fan (22). The power supply interface (19) and power switch (20) are fixedly installed at the rear end of the housing (1); the control panel (21) is fixedly installed at the front end of the housing (1); the cooling fan (22) consists of two sets of silent axial flow fans, which are symmetrically installed on both sides of the bottom cover (2) near the control circuit board (18). The bottom cover (2) has a heat dissipation hole with a dustproof mesh at the fan position.

2. The graphene far-infrared heating dry-wet dual-purpose heat preservation buffet stove according to claim 1, characterized in that, A rubber sealing gasket is provided between the bottom cover (2) and the shell (1), and anti-slip feet (3) are fixedly installed at the four corners of the bottom of the bottom cover (2).

3. The graphene far-infrared heating dual-purpose wet and dry heat-preserving buffet stove according to claim 1, characterized in that, The bottom of the basin (8) is provided with a drain hole with a rubber plug.

4. The graphene far-infrared heating dry-wet dual-purpose heat preservation buffet stove according to claim 1, characterized in that, The shell (1) is made of cold-rolled steel plate, and the outer surface is treated with 80-100μm thick electrostatic powder coating. The corners of the shell (1) are rounded.

5. A graphene far-infrared heating dual-purpose wet and dry heat-preserving buffet stove according to claim 1, characterized in that, The wires (17), temperature sensor (9), power supply interface (19), power switch (20), and cooling fan (22) are all reliably connected to the corresponding interfaces of the control circuit board (18).

6. The graphene far-infrared heating dry-wet dual-purpose heat preservation buffet stove according to claim 1, characterized in that, The inner side of the cover (5) is bonded with a heat-insulating cotton layer, and the outside of the heat-insulating cotton layer is covered with a stainless steel sheet.

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