Dish-shaped heating plate

Abstract

The utility model discloses a dish-shaped heating plate which comprises an upper plate body and a buckle type lower plate body which are integrally formed. A boss wave surface and an annular groove are arranged at the bottom of the upper tray body, and double groups of Cr20Ni80 heating wires are arranged in the upper tray body; the lower disc body is provided with a spring adjusting mechanism. Water seepage prevention is achieved through an integrated structure, uniform heating is achieved through double sets of heating wires, deformation resistance is achieved through buckling design, and efficient and stable heating is achieved. The electric cooker has the advantages of being high in heat efficiency, long in service life and easy to clean.

Description

Technical Field

[0001] This utility model relates to the field of electric heating cookware technology, specifically a disc-shaped heating plate for electric cookware such as rice cookers, electric pressure cookers, and electric kettles. This heating plate, through optimized structural design and a dual-set heating wire layout, solves the problems of uneven heating, water seepage and stains, difficult cleaning, and aging associated with traditional heating plates, thereby improving heating efficiency and service life. Background Technology

[0002] Currently, existing electric cooking appliances (such as rice cookers and electric kettles) generally have the following defects in their mica sheet heating element plates:

[0003] Water seepage and stains: Traditional heating plates use a multi-layered splicing structure, which is complicated to process. Liquids can easily seep into the seams, leading to stains that are difficult to clean, accelerate aging, and even cause the risk of electric leakage.

[0004] Low thermal efficiency of a single heating wire: The heating of a single heating wire is concentrated, resulting in uneven heating and affecting the taste of food (such as local burning).

[0005] Poor structural stability: The plate is prone to deformation at high temperatures, affecting its fit with the inner pot and reducing heat transfer efficiency.

[0006] Therefore, there is an urgent need for a new type of heating plate that is simple in structure, has uniform heat distribution, is waterproof, easy to clean, and durable. Utility Model Content

[0007] This utility model aims to provide a disc-shaped heating plate that solves the problems of existing technologies through the following innovative design:

[0008] Dual heating wire layout: improves heating uniformity and avoids localized overheating;

[0009] One-piece upper plate with annular groove: prevents water seepage and facilitates the drainage and cleaning of stains;

[0010] Snap-fit ​​upper and lower plate structure: enhances overall rigidity and reduces high-temperature deformation;

[0011] Adjustable lower plate assembly: adaptable to different pot inner pots, ensuring a tight fit.

[0012] To solve the problems of the prior art, the present invention adopts the following technical solution:

[0013] A disc-shaped heating plate includes a heating plate body.

[0014] The electric heating plate body includes an upper plate body and a lower plate body;

[0015] The upper plate is a one-piece molded disc-shaped structure with a raised, wavy bottom surface, a thermostat mounting hole in the center, and an annular groove at the edge.

[0016] The bottom of the upper plate is concave and is fixedly connected to the lower plate by a snap-fit ​​method.

[0017] A mica heating assembly is provided between the upper plate and the lower plate, including a mica inner sheet, a mica protective sheet and a mica chip disposed between the two, and a double set of heating wires are fixed on the surface of the mica chip.

[0018] The two sets of heating wires are respectively connected to the lead wires, which pass through the lead wire outlet holes of the mica protective sheet to the central hole of the ceramic base;

[0019] The bottom of the lower plate is equipped with an adjustment mechanism consisting of a fixed foot, a spring, a washer, and a screw.

[0020] Furthermore, the annular groove formed by the convex wave surface of the upper plate and the disc-shaped edge is used to guide the liquid and prevent it from seeping into the interior of the heating plate.

[0021] Furthermore, the two sets of heating wires are connected in parallel or series to achieve uniform heating.

[0022] Furthermore, the lower plate body has a reinforcing edge, which, after being snapped together with the upper plate body, forms an anti-deformation structure.

[0023] Furthermore, the adjustment mechanism achieves a tight fit between the heating plate and the inner pot through the cooperation of springs and screws.

[0024] Furthermore, the dual heating wires are made of Cr20Ni80 alloy material.

[0025] Furthermore, the upper plate is manufactured using a hydraulic stretching or die-casting process, so that the upper plate is integrally formed.

[0026] An electric cooking appliance includes the dish-shaped heating plate described above.

[0027] Furthermore, the electric cooking appliance is a rice cooker, an electric pressure cooker, an electric kettle, or a ceramic pot.

[0028] The beneficial effects of this utility model are:

[0029] 1. Disc-shaped integrated upper plate body.

[0030] Raised wave surface: The bottom surface of the upper plate adopts a raised wave design to increase the contact area with the inner pot and improve heat conduction efficiency;

[0031] Annular groove: The edge is provided with a guide groove to collect the liquid that overflows during cooking, preventing it from seeping into the mica heating element. It can also guide water stains that stick to the bottom of the pot during rice washing to the groove, so as to avoid the water vapor noise caused by high temperature evaporation when heated.

[0032] Thermostat mounting hole: A thermostat mounting hole is set in the center to achieve precise temperature control.

[0033] 2. Dual-set mica heating wire module.

[0034] Two sets of densely packed heating wires are connected in parallel or series and are evenly wrapped around the surface of the mica chip to expand the thermal field coverage.

[0035] Lead wire exit structure: The heating wire leads pass through the lead wire holes of the mica sheath and are connected to the ceramic base to ensure insulation safety.

[0036] 3. Adjustable lower plate assembly.

[0037] Elastic adjustment mechanism: The bottom of the lower plate is equipped with fixed feet, springs, washers and screws. The heating plate and the inner pot are tightly fitted by adjusting the screw pressure.

[0038] Reinforced edge design: The lower plate body has a reinforced edge structure, which enhances the overall resistance to deformation after being snapped together with the upper plate body. Attached Figure Description

[0039] Figure 1 This is an exploded view of the mica heating plate of this utility model.

[0040] Figure 2 This is a schematic diagram of the installation structure of the bottom concave surface of the upper plate and the lower plate of this utility model;

[0041] Figure 3 This is a schematic diagram of the connection method (parallel / series) of the dual heating wires of this utility model;

[0042] Figure 4 for Figure 2 A magnified schematic diagram of part A;

[0043] Figure 5 This is a cross-sectional view of the upper plate of this utility model.

[0044] In the diagram: 1 Upper plate, 2 Mica inner sheet, 3 Mica chip, 4 Lead wire hole, 5 Dual heating wires, 6 Heating wire lead wire, 7 Mica protective sheet, 8 Lead wire outlet hole, 9 Ceramic base, 10 Center hole, 11 Lower plate, 12 Reinforcing edge, 13 Ceramic base mounting hole, 14 Fixing foot, 15 Spring, 16 Washer, 17 Screw, 18 Clip, 19 Thermostat mounting hole, 20 Wavy surface, 21 Annular groove. Detailed Implementation

[0045] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The embodiments described in this section are merely exemplary and are not intended to limit the scope of protection of this utility model.

[0046] Example 1: Disc-shaped heating plate for rice cooker.

[0047] 1. Structural composition:

[0048] The heating plate in this embodiment mainly consists of the following components (see...) Figure 1-5 ):

[0049] Upper plate 1: Made of aluminum alloy or stainless steel in one piece, with an overall disc-shaped structure;

[0050] Lower plate 11: Made of die-cast aluminum alloy, with reinforcing edges 12;

[0051] Mica heating element: includes mica inner sheet 2, mica chip 3 and mica protective sheet 7;

[0052] Heating wire assembly: includes two sets of double heating wires 5 made of Cr20Ni80 alloy, each set of double heating wires 5 includes a first set of heating wires and a second set of heating wires.

[0053] Adjustment mechanism: fixed foot 14, spring 15, washer 16, screw 17;

[0054] Thermostat mounting components: thermostat mounting hole 19 and matching fasteners. The matching fasteners are common knowledge and will not be described in detail here.

[0055] 2. Manufacturing process:

[0056] (1) Construction of the upper plate:

[0057] The stainless steel upper plate 1 is formed by a hydraulic stretching machine, while the aluminum alloy upper plate 1 is formed by a die casting machine.

[0058] After molding, the bottom of the upper plate 1 forms a raised wavy surface 20 with a raised height of 3mm and a wave spacing of 15mm.

[0059] A centrally machined temperature controller mounting hole 19 with a diameter of 8mm is provided.

[0060] The annular groove 21 has an edge processing depth of 2-7mm and a width of 5-9mm, preferably an edge processing depth of 7mm and a width of 9mm. The processing depth and width of the annular groove 21 can also be dynamically adjusted according to actual production needs.

[0061] (2) Fabrication of heating wire assembly:

[0062] Select Cr20Ni80 alloy wire with a diameter of 0.25-0.35mm, preferably 0.3mm;

[0063] The dual heating wires 5 are connected in parallel or series.

[0064] Series winding method: A single continuous wire is wound into two sets of coils to form a single current path. The two sets of coils are directly connected by a jumper (without any break points).

[0065] Parallel winding method: Two sets of independent coils are wound separately, and the ends are combined to a common junction. Branch leads need to be reserved.

[0066] For example: the winding method of the dual-group heating wire 5 of this utility model:

[0067] Two semi-circular mica chips, each with an independent first set of heating wires and a second set of heating wires wound on its surface;

[0068] Positive current path: The first set of heating wires and the second set of heating wires are wound together on the first semi-circular mica chip, and two positive leads are formed at the lead ends;

[0069] Negative current path: The first set of heating wires and the second set of heating wires are independently wound on the second semi-circular mica chip, and each of them leads out a negative lead to form two negative leads;

[0070] Splicing structure: The two semi-circular mica chips are spliced ​​into a complete circle by laser welding or mechanical snap-fit, with a splicing gap of ≤0.1mm;

[0071] Insulation treatment: The inside of the lead hole is coated with high-temperature resistant insulating adhesive and covered with a fiberglass sleeve.

[0072] 3. Assembly process:

[0073] (1) Assembly of mica heating components:

[0074] Place the mica chip 3 on the mica inner sheet 2;

[0075] After the heating wire 6 passes through the lead hole 4 of the mica chip 3, it enters the center hole 10 of the ceramic base 9. The ceramic base 9 passes through the lead hole 8 of the protective plate 7 and then through the ceramic base mounting hole 13 of the lower plate 11.

[0076] (2) Overall assembly:

[0077] Place the mica heating element into the concave surface of the upper plate 1;

[0078] The upper plate 1 is fastened to the reinforcing edge 12 of the lower plate 11 by the inner side buckle 18 at the lower end of the concave surface, so that the entire lower plate 11 is securely fastened in the concave surface.

[0079] Installation and adjustment mechanism: Fixing foot 14 is fixed to the bottom side of the lower plate 11, and has a threaded hole inside. Spring 15 is inserted into the column of fixing foot 14 in sequence. Then, screw 17 is inserted from the outside of the middle layer protective body inside the pot and screwed into the threaded hole of fixing foot 14 for fixation. Washer 16 is installed between the middle layer protective body inside the pot and the nut of screw 17. One end of spring 15 presses against the lower plate 11, and the other end presses against the bottom of the middle layer protective body inside the pot. Adjust the pressure of screw 17 to make the heating plate and the inner pot fit tightly. Finally, install the thermostat and connect the heating wire lead 6 to the control circuit.

[0080] 4. Work process:

[0081] When the rice cooker is powered on:

[0082] Current is supplied to the dual heating wires 5 through the heating wire lead 6;

[0083] The first and second sets of heating wires work simultaneously, ensuring uniform heating in both the central and peripheral areas.

[0084] The thermostat monitors the temperature in real time and cuts off the power when the set value is reached to avoid the risk of overheating (such as dry burning protection).

[0085] During cooking, any liquid that overflows will be guided along the annular groove 21 to prevent it from seeping into the interior and causing risks such as electrical short circuits.

[0086] Example 2: Improved heating plate for electric kettle.

[0087] The main difference between this embodiment and Embodiment 1 is:

[0088] The diameter of the upper plate 1 is reduced to 150mm (180mm in Example 1), and can also be dynamically adjusted according to actual production needs;

[0089] A dual-group heating wire 5 is used, which can be connected in series or in parallel;

[0090] The adjustment mechanism is equipped with a silicone sealing ring, which improves the waterproof rating.

[0091] The thermostat is installed 15° off-center to accommodate the kettle's structure.

[0092] Example 3: High-temperature resistant heating plate for ceramic pot.

[0093] The special design features of this embodiment include:

[0094] The upper plate 1 is made of ceramic composite material;

[0095] A silicon nitride protective layer is added to the surface of the dual heating wires 5;

[0096] The adjustment mechanism uses a high-temperature resistant stainless steel spring;

[0097] The depth of the annular groove 21 is preferably 5mm to suit the structure of the ceramic pot.

[0098] Technical Parameter Comparison

[0099] parameter Example 1 Example 2 Example 3 Operating voltage 220V 220V 220V Total power 800W 1500W 600W Thermal efficiency 92％ 90％ 88％ heating rate 3℃ / s 5℃ / s 2℃ / s life 5000h 3000h 8000h

[0100] Precautions:

[0101] During assembly, ensure that the mica heating element is completely sealed. Use high-temperature resistant (>300℃) adhesive to fix the heating wire. Regularly check whether the adjustment mechanism is loose. Avoid scratching the wavy surface of the boss with hard objects when cleaning.

[0102] The above embodiments are merely examples. Those skilled in the art can make various modifications or alterations within the scope of the claims, and all such modifications and alterations should fall within the protection scope of this utility model.

Claims

1. A disc-shaped heating plate, comprising a heating plate body, characterized in that: The electric heating plate body includes an upper plate body (1) and a lower plate body (11); The upper plate (1) is an integrally formed disc-shaped structure with a raised wavy surface (20) on its bottom surface, a thermostat mounting hole (19) in the center, and an annular groove (21) on its edge. The bottom of the upper plate (1) is concave and is fixedly connected to the lower plate (11) by a snap-fit ​​method; A mica heating assembly is provided between the upper plate (1) and the lower plate (11), including a mica inner sheet (2), a mica protective sheet (7) and a mica chip (3) disposed between the two. The surface of the mica chip (3) is fixed with a double set of heating wires (5) that are evenly and densely arranged around it. The dual heating wires (5) are connected to the lead wires (6) respectively. The lead wires (6) pass through the lead wire outlet (8) of the mica protective sheet (7) and into the center hole (10) of the ceramic base (9). The bottom of the lower plate (11) is provided with an adjustment mechanism consisting of a fixed foot (14), a spring (15), a washer (16) and a screw (17).

2. The dish-shaped heating plate according to claim 1, characterized in that: The annular groove (21) formed by the convex wave surface (20) of the upper plate (1) and the disc edge is used to guide the liquid and prevent it from seeping into the heating plate.

3. The dish-shaped heating plate according to claim 1, characterized in that: The dual heating wires (5) are connected in parallel or in series to achieve uniform heating.

4. The dish-shaped heating plate according to claim 1, characterized in that: The lower plate (11) has a reinforcing edge (12) at its edge, which is snapped into the upper plate (1) to form an anti-deformation structure.

5. The dish-shaped heating plate according to claim 1, characterized in that: The adjustment mechanism achieves tight fit adjustment between the heating plate and the inner pot through the cooperation of spring (15) and screw (17).

6. The dish-shaped heating plate according to claim 1, characterized in that: The dual heating wires (5) are made of Cr20Ni80 alloy material.

7. The dish-shaped heating plate according to claim 1, characterized in that: The upper plate (1) is manufactured by hydraulic stretching or die casting process, so that the upper plate (1) is integrally formed.

8. An electric cooking appliance, characterized in that: Includes the dish-shaped heating plate as described in any one of claims 1-7.

9. The electric cooking appliance according to claim 8, characterized in that: The electric cooking appliance is a rice cooker, electric pressure cooker, electric kettle, or ceramic pot.

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