Heating disc structure

Abstract

The utility model discloses a heating disc structure, which is characterized in that two groups of symmetrical heating assemblies are arranged, each group of heating assembly comprises a mica sheet with a smaller area and a winding wound on the mica sheet, and the area of each mica sheet is smaller, so that the length that each winding needs to stretch across is reduced when the winding is wound; under the condition of certain heating power (certain winding length), the winding on each mica sheet can be wound more densely, so that the heating efficiency can be improved, the disc surface is of a gently sinking structure from the edge to the center, and reinforcing ribs are uniformly distributed on the disc surface, so that the disc surface is not easy to bulge and deform due to heating.

Description

Technical Field

[0001] This utility model belongs to the field of cookware technology, and in particular relates to a heating plate structure. Background Technology

[0002] The heating plate is the main heating element in cooking appliances such as rice cookers. Its heating efficiency and lifespan are important factors in evaluating the quality of a cooker. Specifically, the heating plate includes a base, a cover, an inner insulating sheet, an outer insulating sheet, and a heating element positioned between the inner and outer insulating sheets. The heating element includes a mica sheet and a winding, which is typically a coiled heating wire wound onto the mica sheet. However, existing heating elements have low heating efficiency and result in a high heat load per unit area on the cover, causing the cover to easily deform due to prolonged exposure to high temperatures. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] In order to overcome the above shortcomings, the purpose of this utility model is to provide a heating plate structure to solve the technical problems of low heating efficiency of heating components in existing heating plate structures and high heat load per unit area of ​​the cover, which leads to easy deformation of the cover.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] A heating plate structure includes: a chassis with multiple terminals disposed thereon; an outer insulating sheet disposed on the chassis; two sets of heating components symmetrically disposed on the outer insulating sheet; each set of heating components includes a mica sheet and a winding wound on the mica sheet; wherein the ends of the windings in the two sets of heating components pass through the outer insulating sheet and are connected to the corresponding terminals; and further includes: an inner insulating sheet disposed on the two sets of heating components and a cover disposed on the inner insulating sheet and connected to the chassis.

[0008] Existing heating components consist of a single set, including a large mica sheet and a winding. The winding is wound around the entire mica sheet, requiring a considerable lateral length. With a fixed heating power (and a fixed winding length), the winding density is relatively sparse, resulting in low heating efficiency. This application addresses this by setting two symmetrical sets of heating components, each consisting of a smaller mica sheet and windings wound around it. Because each mica sheet is smaller, the lateral length required for each winding is reduced. With a fixed heating power (and a fixed winding length), the windings on each mica sheet can be wound more densely, thus improving heating efficiency. Furthermore, the power of a single heating component after grouping is reduced (the power of the two sets equals the power of a single existing heating component). Therefore, the heat load per unit area of ​​the cover and the heat load per unit area of ​​the heating wire are reduced, making the cover less prone to heat deformation and reducing the expansion rate of the heating wire, thereby extending its service life.

[0009] In some embodiments, the upper surface of the cover gradually slopes downward from the edge toward the center;

[0010] Because the center of the cover accumulates more heat and has a larger heat load, it is prone to deformation. This application recesses the center of the cover downwards, making the center lower than the perimeter by a certain height. This increases the variable space in the center of the cover and prevents the center of the cover from bulging out during heating, which would cause poor contact between the bottom of the heated container and the cover, thus affecting the heating efficiency.

[0011] In some embodiments, the cover protrudes from the bottom to the upper end face to form a plurality of interconnected first heat storage reinforcing cavities, wherein reinforcing ribs are formed between adjacent first heat storage reinforcing cavities;

[0012] By setting up a first heat storage reinforcement cavity, not only can the strength of the cover structure be enhanced, but hot air can also be gathered, increasing heat energy storage and making the heating efficiency higher.

[0013] In some embodiments, the first heat storage reinforcement cavity has a rhomboid or rectangular structure;

[0014] While ensuring a large space for heat storage, the rhomboid or rectangular shape, due to its regular shape, allows for more uniform heat transfer and makes the cover structure more stable.

[0015] In some embodiments, the chassis is recessed from the upper end toward the bottom to form a grid-shaped second heat storage reinforcement cavity;

[0016] Similarly, by setting up a second heat storage reinforcement cavity, not only can the strength of the chassis structure be strengthened, but also the hot air can be gathered. Then the hot air is conducted towards the cover to heat the bottom of the heating container, avoiding a large amount of hot air dissipating from the chassis, increasing heat energy storage and making the heating efficiency higher.

[0017] In some embodiments, the terminal block includes: a hollow ceramic bead connected to a chassis, an elongated insertion hole through the ceramic bead at the end, a plug that matches the shape of the insertion hole and is inserted into the insertion hole, and a connecting piece connected to the upper end of the plug, wherein the connecting piece has a screw hole for connecting to an external wire.

[0018] By creating elongated insertion holes on the ceramic beads and designing the inserts as flat structures, the connecting pieces are welded to the inserts. When the inserts are inserted into the insertion holes, they are held in place by the high-strength ceramic beads, preventing the inserts from rotating when the connecting pieces are tightened with screws. This ensures that the inserts and connecting pieces can withstand a certain amount of torque during wiring, guaranteeing the reliability of the wiring.

[0019] In some embodiments, it further includes: a mounting bracket, one end of which extends radially outward to form a first limiting surface located on one side of the chassis mounting hole and having a diameter larger than the mounting hole, and the other end of which protrudes through the mounting hole and is pressed near the first limiting surface to form a first limiting portion that cooperates with the first limiting surface to clamp the edge of the mounting hole;

[0020] By setting a first limiting surface with a diameter larger than the chassis mounting hole at one end of the mounting bracket, when fixing the mounting bracket to the chassis, the other end of the mounting bracket passes through the chassis mounting hole, with the first limiting surface located on one side of the mounting hole. Then, by applying vertical pressure to the mounting bracket, the mounting bracket is squeezed and deformed outward near the first limiting surface to form the first limiting part. The first limiting surface and the first limiting part cooperate with each other to clamp the edge of the mounting hole from top to bottom, so that the mounting bracket is assembled to the chassis. No screws are required when assembling the mounting bracket, resulting in high assembly efficiency. A large amount of materials can be saved without the need for a large number of screws, thereby reducing production costs.

[0021] In some embodiments, the system further includes: a guide bracket disposed on the chassis, wherein one end of the guide bracket extends radially outward to form a second limiting surface located within the chassis mounting hole and having a diameter larger than the mounting hole, and the other end extends out of the mounting hole and is pressed near the mounting hole to form a second limiting portion that cooperates with the second limiting surface to clamp the edge of the mounting hole. Attached Figure Description

[0022] Figure 1 This is a first-view structural schematic diagram of the heating plate structure of this utility model;

[0023] Figure 2 This is a second-view structural schematic diagram of the heating plate structure of this utility model;

[0024] Figure 3 This is an exploded view of the heating plate structure of this utility model;

[0025] Figure 4 This is a bottom view of the top cover in the heating plate structure of this utility model;

[0026] Figure 5 This is an assembly diagram of the two heating components in the heating plate structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the wiring terminals in the heating plate structure of this utility model;

[0028] Figure 7 This is an exploded view of the wiring terminals in the heating plate structure of this utility model;

[0029] Figure 8 This is a schematic diagram of the mounting bracket in the heating plate structure of this utility model;

[0030] Figure 9 This is a schematic diagram of the guide bracket in the heating plate structure of this utility model;

[0031] Figure 10 This is a cross-sectional view of the mounting bracket installed on the chassis in the heating plate structure of this utility model;

[0032] Figure label:

[0033] 1. Chassis; 101. Second heat storage reinforcement cavity; 2. Outer insulating sheet; 3. Heating component; 301. Mica sheet; 302. Winding; 3021. Winding end; 4. Inner insulating sheet; 5. Cover; 501. First heat storage reinforcement cavity; 502. Reinforcing rib; 6. Terminal block; 601. Ceramic bead; 6011. Insertion hole; 602. Insert; 603. Connecting piece; 7. Male insert; 8. Mounting bracket; 801. First column; 802. First limiting surface; 803. First limiting part; 9. Guide bracket; 901. Second column; 902. Second limiting surface; 903. Second limiting part. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0035] Please see Figures 1-3The present invention provides a heating plate structure, comprising: a base plate 1 on which a plurality of terminals 6 are provided; an outer insulating sheet 2 on the base plate 1; two sets of heating components 3 symmetrically arranged on the insulating sheet; each set of heating components 3 including a mica sheet 301 and a winding 302 wound on the mica sheet 301; wherein the ends 3021 of the windings in the two sets of heating components 3 pass through the outer insulating sheet 2 and are connected to the corresponding terminals 6; and further comprising: an inner insulating sheet 4 on the two sets of heating components 3 and a cover 5 on the inner insulating sheet 4 and connected to the base plate 1.

[0036] Specifically, the existing heating component 3 is a set, including a large mica sheet 301 and a set of windings 302. The windings 302 need to be wound around the entire mica sheet 301, and the span is relatively long. Under the premise of a predetermined heating power (with a fixed length of heating wire), the density of the heating wire winding is relatively sparse, and the heating efficiency is not high.

[0037] Specifically, the chassis 1 is equipped with a positive terminal 6 and a negative terminal 6.

[0038] Please see Figure 5 In this application, the heating component 3 is divided into two separate windings 302. After the corresponding mica sheet 301 is wound, each winding 302 leaves a section of winding end 302 (thread head) at both ends. The two mica sheets 301 and the two windings 302 are folded in half, and the winding ends 302 (thread heads) of the two windings 302 are welded to the male insert 7. After welding, the two mica sheets 301 and the two windings 302 are flattened from the middle and can be placed on the outer insulating sheet 2 for installation.

[0039] Specifically, the outer insulating sheet 2 has a clearance groove at the position corresponding to the male plug 7, so that the male plug 7 can pass through and connect to the positive terminal 6 and the negative terminal 6.

[0040] Specifically, this application sets up two sets of heating components 3. Each set of heating components 3 includes a small mica sheet 301 and a winding 302 wound on it. Since the area of ​​each mica sheet 301 is small, the length required for the winding 302 to be wound is reduced. With the same length of heating wire, the winding 302 on each mica sheet 301 can be wound more densely, thus improving the heating efficiency.

[0041] Preferably, the present application also sets the structure of the cover 5 to gently sink from the edge to the center and evenly distribute the reinforcing ribs 502, so that the cover is not easily deformed by heat.

[0042] Specifically, this application sets the middle of the upper surface of the cover 5 to be recessed downwards, so as to increase the variable space in the middle of the cover 5 and prevent the middle from bulging out during heating, which would cause poor contact between the bottom of the heated container and the cover and affect the heating efficiency.

[0043] Please see Figure 4 Preferably, in this application, the cover 5 protrudes from the bottom to the upper end face to form a plurality of interconnected first heat storage reinforcing cavities 501.

[0044] The first heat storage and strengthening cavity 501 forms a space inside, which can store the heat emitted by the winding 302 (heating wire) and then conduct it outward, avoiding the rapid and large-scale dissipation of heat, resulting in a high amount of heat loss from the cover 5. The chassis 1 of this application can improve the heat utilization efficiency.

[0045] Preferably, the first heat storage reinforcement cavity 501 has a rhomboid or rectangular structure. The rhomboid or rectangular shape ensures a large heat storage space, and the heat transfer is more uniform due to the regular shape.

[0046] Preferably, in this application, the chassis 1 is recessed from the bottom to the upper end face to form a plurality of interconnected second heat storage reinforcement cavities 101, which can also achieve the same effect as the cover 5 in terms of enhancing structural strength and storing heat.

[0047] Please see Figure 6 and Figure 7 Preferably, the terminal block 6 of this application includes: a ceramic bead 601 with a hollow structure connected to the chassis 1, an elongated insertion hole 6011 through the ceramic bead 601 at the upper end, a plug 602 that matches the shape of the insertion hole 6011 and is inserted into the insertion hole 6011 at the lower end, and a connecting piece 603 connected to the upper end of the plug 602, wherein the connecting piece 603 has a screw hole for connecting to external wires.

[0048] By creating an elongated insertion hole 6011 on the ceramic bead 601 and setting the insert 602 into a flat structure, the connecting piece 603 is welded to the insert 602. In this way, when the insert 602 is inserted into the insertion hole 6011, the insert 602 is held in place by the high-strength ceramic bead 601, preventing the insert 602 from rotating when the connecting piece 603 is tightened. This ensures that the insert 602 and the connecting piece 603 can withstand a certain torque during wiring, thus ensuring the reliability of the wiring.

[0049] Specifically, after the winding ends 302 (thread ends) of the two windings 302 are welded to the male connector 7, the male connector 7 is inserted into the ceramic bead 601 and contacts the connector 602 to conduct electricity, so that the two connectors can be welded.

[0050] Please see Figure 8 and Figure 10Preferably, it further includes: a mounting bracket 8, the upper end of which is a first column 801, the lower end of which extends radially outward to form a first limiting surface 802 located below the mounting hole of the chassis 1 and with a diameter larger than the mounting hole, and the upper end of which extends radially outward near the first limiting surface 802 to form a first limiting part 803 that cooperates with the limiting surface to clamp the edge of the mounting hole.

[0051] By setting a first limiting surface 802 with a diameter larger than the mounting hole of the chassis 1 at the bottom of the mounting bracket 8, when fixing the mounting bracket 8 to the chassis 1, one end of the mounting bracket 8 passes through the mounting hole of the chassis 1, and the first limiting surface 802 is located on one side of the mounting hole. By applying vertical pressure to the mounting bracket 8, the mounting bracket 8 is deformed outward near the first limiting surface 802 to form a first limiting part 803. The first limiting surface 802 and the first limiting part 803 cooperate with each other to clamp the edge of the mounting hole from top to bottom, so that the mounting bracket 8 is assembled to the chassis 1. No screws are needed when assembling the mounting bracket 8, the assembly efficiency is high, and a lot of materials can be saved without using a large number of screws, thereby reducing production costs.

[0052] Please see Figure 9 Preferably, it further includes: a guide bracket 9 disposed on the chassis 1, the upper end being a second column 901, the lower end extending radially outward to form a second limiting surface 902 located in the mounting hole of the chassis 1 and having a diameter larger than the mounting hole, the upper end passing through the mounting hole, and being squeezed near the mounting hole under vertical pressure to form a second limiting part 903 that cooperates with the second limiting surface 902 to clamp the edge of the mounting hole.

[0053] The guide bracket 9 and the mounting bracket 8 are assembled onto the chassis 1 in the same way. However, since the guide bracket 9 only guides the entire heating plate structure to be installed onto the outer shell, there is no need to set a threaded structure inside. The mounting bracket 8 has a threaded structure inside, and the entire heating plate structure is locked onto the shell by screws inserted into the internal threaded structure.

[0054] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A heating plate structure, characterized in that, include: The chassis (1) is provided with multiple terminals (6), an outer insulating sheet (2) is provided on the chassis (1), and two sets of heating components (3) are symmetrically arranged on the outer insulating sheet (2). Each set of heating components (3) includes a mica sheet (301) and a winding (302) wound on the mica sheet (301). The ends (3021) of the windings in the two sets of heating components (3) pass through the outer insulating sheet (2) and are simultaneously connected to the corresponding terminals (6). The chassis (1) is also provided with an inner insulating sheet (4) provided on the two sets of heating components (3) and a cover (5) provided on the inner insulating sheet (4) and connected to the chassis (1).

2. The heating plate structure according to claim 1, characterized in that, The upper surface of the cover (5) gradually slopes down from the edge to the center.

3. The heating plate structure according to claim 1, characterized in that, The cover (5) protrudes from the bottom to the upper end face to form a plurality of interconnected first heat storage reinforcing cavities (501), wherein a reinforcing rib (502) is formed between adjacent first heat storage reinforcing cavities (501).

4. The heating plate structure according to claim 3, characterized in that, The first heat storage reinforcement cavity (501) has a rhomboid or rectangular structure.

5. The heating plate structure according to claim 1, characterized in that, The chassis (1) is recessed from the top to the bottom to form a grid-shaped second heat storage reinforcement cavity (101).

6. The heating plate structure according to claim 1, characterized in that, The terminal block (6) includes: a hollow ceramic bead (601) connected to the chassis (1), an elongated insertion hole (6011) through the ceramic bead (601) at the end, a insert (602) that matches the shape of the insertion hole (6011) and is inserted into the insertion hole (6011), and a connecting piece (603) connected to the upper end of the insert (602), wherein the connecting piece (603) has a screw hole for connecting to an external wire.

7. The heating plate structure according to claim 1, characterized in that, Also includes: The mounting bracket (8) extends radially outward at one end to form a first limiting surface (802) located on one side of the mounting hole of the chassis (1) and having a diameter larger than that of the mounting hole. The other end extends out of the mounting hole and is squeezed near the first limiting surface (802) to form a first limiting part (803) that cooperates with the first limiting surface (802) to clamp the edge of the mounting hole.

8. The heating plate structure according to claim 1, characterized in that, Also includes: A guide bracket (9) is provided on the chassis (1), wherein one end of the guide bracket (9) extends radially outward to form a second limiting surface (902) located in the mounting hole of the chassis (1) and having a diameter larger than that of the mounting hole, and the other end protrudes from the mounting hole and is squeezed near the mounting hole to form a second limiting part (903) that cooperates with the second limiting surface (902) to clamp the edge of the mounting hole.

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