Heat preservation and heating structure of electric cooker

Abstract

The utility model relates to the technical field of heat preservation of electric cookers, discloses a heat preservation heating structure of an electric cooker, and solves the problems that heat preservation heat energy of a conventional electric cooker is completely provided by a heat preservation element, so that the operation power of the heat preservation element is larger, and the heat preservation element is easy to damage. The heat preservation plate of the electric cooker and the heating disc are connected in series in a conductive mode, the heat preservation plate of the electric cooker can conduct low-voltage and low-power heating while the heating disc conducts heating work under low voltage and low power, therefore, the overall heat preservation power is reduced, spontaneous heat energy of the heat preservation plate directly acts on the cooker container body, energy consumption is reduced, and the service life of the electric cooker is prolonged. Meanwhile, the working power of the heat preservation sheet is also weakened. By improving the winding structure of the traditional heat insulation sheet, the electric heating element is set to be an integrated heating sheet processed by an iron-chromium alloy or nickel-chromium alloy coiled tape, so that the resistance of the heating disc is reduced, the current in a circuit is improved, and the working power of the heating disc is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat preservation of electric rice cookers, in particular to a heat preservation and heating structure of an electric rice cooker. Background Art

[0002] The basic structure of the electric rice cooker used in daily life is composed of an outer shell, a pot core, a heating plate and a temperature control device. The electric rice cooker can be divided into two states during operation: heating state and keeping warm state.

[0003] In order to keep the rice cooker warm, an internal insulation element is used. Its structure is to wrap the heating wire around the mica sheet, heat the heating wire by turning on the power, and then transfer the heat generated by the heating wire to the heating plate, and then transfer the heat from the heating plate to the inner part of the pot to achieve the insulation function of the rice cooker. Since the contact area between the heating wire and the heating plate is limited and the heating wire itself has a high resistance, the insulation heat implemented by the heating plate comes entirely from the heating wire, but only part of the heat emitted by the heating wire is transferred to the heating plate, and part of the heat will diffuse into the air. Therefore, the heating wire often needs to be heated to above 260 degrees to meet the insulation requirements of the inner part of the pot. The heating wire is prone to burnout after working at high temperature for a long time, which affects its service life and is not very safe. Summary of the invention

[0004] The utility model aims to provide a heat preservation and heating structure for an electric rice cooker, which solves the problem that the heat preservation heat energy of the heating plate of the conventional electric rice cooker is completely provided by a heat preservation element, so that the operating power of the heat preservation element is large and it is easy to be damaged.

[0005] To achieve the above object, the utility model provides the following technical solutions: a heat preservation and heating structure of an electric rice cooker, comprising a shell body, a heating plate fixedly mounted on the inner side of the shell body, a pot body placed above the heating plate, characterized in that: the bottom surface of the heating plate is connected to a heat preservation plate through a heat conductive material, two wires are conductively connected to the lower surface of the heating plate, the wires connect the circuit inside the device, a driving mechanism is also fixedly mounted on the bottom surface of the heating plate, and the driving mechanism is used to install the heat preservation plate;

[0006] The insulation board includes an electric heating element, which is conductively mounted on a wire, and the electric heating element and the heating plate are connected in series in a circuit via the wire;

[0007] The driving mechanism includes an annular guide rail which is fixedly installed in the air below the heating plate through a heat insulation frame, a driving ring is slidably installed inside the annular guide rail, a plate mounting assembly is fixedly connected to the upper surface of the driving ring, the insulation plate is installed on the plate mounting assembly, and a control motor for driving the driving ring to rotate is installed on the outer surface of the annular guide rail.

[0008] Furthermore, the electric heating element is an iron-chromium alloy or a nickel-chromium alloy coil.

[0009] Furthermore, a plurality of grooves are provided on the surface of the electric heating element.

[0010] Furthermore, the wire connects two sides of the electric heating element.

[0011] Furthermore, the upper and lower surfaces of the electric heating element are respectively covered with a mica sheet, the outer surfaces of the two mica sheets are covered with a closed cover, a support frame is fixedly provided on the surface of the closed cover, and the closed cover is fixed inside the shell body through the support frame.

[0012] Furthermore, the sealing cover is made of aluminum material, and the supporting frame is made of galvanized iron plate material.

[0013] Furthermore, the conductor is made of high-temperature silicone wire.

[0014] Furthermore, the outer surface of the heating plate is coated with an insulating coating.

[0015] Furthermore, a driving groove is provided on the lower surface of the annular guide rail, and a mounting ring groove and a pair of power-carrying ring grooves are provided on the upper surface. A pair of connecting rods are provided on the outer arc surface, and a conductive ring is provided at the bottom of the power-carrying ring groove. The two connecting rods are respectively conductively connected to the two conductive rings, and the two connecting rods are connected in series with the heating plate through wires. A tooth groove is provided on the lower surface of the driving ring, and a gear is provided at the output end of the control motor, which is placed in the driving groove and meshes with the tooth groove.

[0016] Furthermore, the disk loading assembly includes a suspension frame fixedly connected to the upper surface of the driving ring, the suspension frame passes through the mounting ring groove and is placed on the side of the annular guide rail close to the ring center, the suspension frame is located on the upper surface of the mounting ring groove and a pair of conductive rods are fixedly installed, a brush is fixedly installed on the lower surface of the conductive rod, the brushes on the lower surfaces of the two conductive rods respectively extend into the inner sides of the two energized ring grooves and are in conductive sliding contact with the conductive ring, one end of the conductive rod close to the insulation plate is conductively connected to the insulation plate through another wire, the other end of the suspension frame is fixedly connected to the conductive rod, the upper surface of the conductive rod is fixedly connected to a spring and an electromagnet, the top of the spring is fixedly connected to an iron sheet seat, the insulation plate is installed on the upper surface of the iron sheet seat, and the electromagnet is placed in the middle of the spring.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The utility model provides a heat preservation and heating structure of an electric rice cooker. By connecting the heat preservation plate of the electric rice cooker and the heating disk in conductive series, the heat preservation plate of the electric rice cooker can also perform low voltage and low power heating while the heating disk performs heating work at low voltage and low power, thereby reducing the overall heat preservation power. The self-heating energy of the heat preservation plate directly acts on the pot body, thereby reducing energy consumption and also weakening the working power of the heat preservation plate. By improving the winding structure of the traditional heat preservation plate, the electric heating element is set as an integrated heating plate processed by iron-chromium alloy or nickel-chromium alloy winding tape, which reduces the resistance of the heating disk, increases the current in the circuit, and then increases the working power of the heating disk.

[0019] The utility model provides a heat preservation and heating structure for an electric rice cooker. Grooves are arranged on the surface of an electric heating element, so that the heating efficiency of the electric heating element can be effectively improved.

[0020] The utility model provides a heat preservation and heating structure of an electric rice cooker. A heat preservation plate capable of circular movement is installed on the lower surface of a heating plate, so that the heat preservation plate can move to heat multiple areas on the lower surface of the heating plate, thereby achieving the effect of accelerated and uniform heating of the heating plate by the heat preservation plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the bottom structure of the housing body of the utility model;

[0023] Figure 3 This is a schematic diagram of the bottom structure of the heating plate of the utility model;

[0024] Figure 4 This is a schematic diagram of the disassembled structure of the insulation board of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the electric heating element of the utility model;

[0026] Figure 6 This is a schematic diagram of the circuit connection of the heating plate and the insulation board of the utility model;

[0027] Figure 7 This is a comparison diagram of the same power electric heat conversion between the insulation board of the utility model and the existing heating wire

[0028] Figure 8 This is a schematic diagram of the driving mechanism structure after the heating plate of the utility model is turned over;

[0029] Fig. 9 It is a schematic diagram of the partial structure of the driving mechanism of the utility model;

[0030] Fig.10 It is a schematic diagram of the upper surface structure of the annular guide rail of the utility model;

[0031] Fig.11 It is a schematic diagram of the structure of the tray loading assembly of the utility model.

[0032] In the figure: 1. shell body; 2. pot body; 3. heating plate; 4. insulation board; 41. electric heating element; 411. row groove; 42. mica sheet; 43. closing cover; 44. support frame; 5. wire; 6. driving mechanism; 61. annular guide rail; 611. driving groove; 612. power ring groove; 613. installation ring groove; 614. wiring rod; 62. insulation frame; 63. control motor; 64. plate assembly; 641. suspension frame; 642. conductive rod; 643. spring; 644. iron sheet seat; 645. electromagnet; 646. brush; 65. driving ring; 651. tooth groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0035] Combination Figure 1-Figure 11 A heat preservation and heating structure of an electric rice cooker comprises an outer shell body 1, a heating plate 3 is fixedly installed on the inner side of the outer shell body 1, a pot body 2 is placed above the heating plate 3, a heat preservation board 4 is connected to the bottom surface of the heating plate 3 through a heat-conducting material, two wires 5 are conductively connected to the lower surface of the heating plate 3, a driving mechanism 6 is also fixedly installed on the bottom surface of the heating plate 3, and the driving mechanism 6 is used to install the heat preservation board 4.

[0036] The utility model is further described below in conjunction with embodiments. Example

[0037] See also Figure 3-Figure 4 The insulation board 4 includes an electric heating element 41, which is conductively mounted on a wire 5. The electric heating element 41 and the heating disk 3 are connected in series in the circuit through the wire 5. By conductively connecting the insulation board 4 and the heating disk 3 in series, the heating disk 3 can also perform heating work at low voltage and low power while the insulation board 4 is generating heat, and the self-heating energy of the heating disk 3 directly acts on the pot body 2, thereby reducing energy consumption and weakening the heating demand of the insulation board 4.

[0038] Furthermore, the electric heating element 41 is an iron-chromium alloy or nickel-chromium alloy coil. The iron-chromium alloy or nickel-chromium alloy coil is used as a heating element. Its resistance is lower than that of a traditional heating wire, and the heating effect is good, so that more current can pass under a fixed voltage. Since the circuits of the heating disk 3 and the insulation board 4 are connected in series, the working power of the heating disk 3 can be effectively improved.

[0039] See also Figure 5 A plurality of grooves 411 are provided on the surface of the electric heating element 41. The grooves 411 cause the electric heating element 41 to be S-shaped, thereby increasing the resistance of the electric heating element 41 and thereby increasing its efficiency of converting electricity into heat. The increase in resistance is still much smaller than the resistance of a traditional heating wire.

[0040] See also Figure 4 The wire 5 connects the two sides of the electric heating element 41, so that the current passes through the electric heating element 41 evenly, so that the surface of the electric heating element 41 is heated evenly.

[0041] See also Figure 4 The upper and lower surfaces of the electric heating element 41 are respectively covered with a mica sheet 42, and the outer surfaces of the two mica sheets 42 are covered with a closing cover 43, and a support frame 44 is fixedly provided on the surface of the closing cover 43. The closing cover 43 is fixed to the inside of the shell body 1 through the support frame 44. The mica sheet 42 is used to insulate the electric heating element 41, and the closing cover 43 is used to wrap the mica sheet 42 and the electric heating element 41 inside to prevent them from oxidation reaction.

[0042] Furthermore, the sealing cover 43 is made of aluminum and the support frame 44 is made of galvanized iron plate. Aluminum can conduct heat well, which facilitates the temperature emitted by the electric heating element 41 to be better transferred to the heating plate 3. Galvanizing can improve the corrosion resistance of the iron plate, making the entire assembly more stable and durable.

[0043] Furthermore, the conductor 5 is made of high-temperature silicone wire, and the high-temperature resistance of the high-temperature silicone wire can effectively increase the service life of the device.

[0044] Furthermore, the outer surface of the heating plate 3 is coated with an insulating coating. Through the provision of the insulating coating, the current carried on the surface of the heating plate 3 will not be transmitted to the outer shell body 1 and the pot body 2, thereby increasing the safety of the device.

[0045] Working principle: First, the electric heating element 41 made of iron-chromium alloy or nickel-chromium alloy tape is connected in series with the heating disk 3 in the circuit through the wire 5. By connecting the insulation board 4 and the heating disk 3 in conductive series, and utilizing the characteristic that the resistance of the iron-chromium alloy or nickel-chromium alloy tape is lower than that of the traditional heating wire, the amount of current passing through the wire 5 will be increased under a fixed voltage, and the insulation board 4 can maintain a good heating effect. While the insulation board 4 is heating, the heating disk 3 can also heat up at low voltage and low power at the same time. The self-heating energy of the heating disk 3 directly acts on the pot body 2, thereby reducing energy consumption and weakening the heating demand of the insulation board 4. Example

[0046] See also Figure 8-Figure 11 The driving mechanism 6 includes an annular guide rail 61 suspended and fixedly installed below the heating plate 3 through a heat insulation frame 62, a driving ring 65 is slidably installed inside the annular guide rail 61, a plate mounting assembly 64 is fixedly connected to the upper surface of the driving ring 65, the heat preservation plate 4 is installed on the plate mounting assembly 64, and a control motor 63 for driving the driving ring 65 to rotate is installed on the outer surface of the annular guide rail 61;

[0047] A driving groove 611 is provided on the lower surface of the annular guide rail 61, and a mounting ring groove 613 and a pair of power-carrying ring grooves 612 are provided on the upper surface. A pair of connecting rods 614 are provided on the outer arc surface. A conductive ring is provided at the bottom of the power-carrying ring groove 612. The two connecting rods 614 are respectively conductively connected to the two conductive rings. The two connecting rods 614 are connected in series with the heating plate 3 through the wire 5. A tooth groove 651 is provided on the lower surface of the driving ring 65. A gear is provided at the output end of the control motor 63 and is placed in the driving groove 611 to mesh with the tooth groove 651. By driving the driving ring 65 by the control motor 63, the driving ring 65 can rotate 360 ​​degrees in the annular guide rail 61.

[0048] The loading assembly 64 includes a suspension frame 641 fixedly connected to the upper surface of the driving ring 65, the suspension frame 641 passes through the mounting ring groove 613 and is placed on the side of the annular guide rail 61 close to the ring center, a pair of conductive rods 642 are fixedly installed on the surface of the suspension frame 641 above the mounting ring groove 613, a brush 646 is fixedly installed on the lower surface of the conductive rod 642, the brushes 646 on the lower surfaces of the two conductive rods 642 respectively extend into the inner sides of the two energized ring grooves 612 and are in conductive sliding contact with the conductive ring, one end of the conductive rod 642 close to the insulation board 4 is conductively connected to the insulation board 4 through another wire 5, the other end of the suspension frame 641 is fixedly connected to the conductive rod 642, the upper surface of the conductive rod 642 is fixedly connected to a spring 643 and an electromagnet 645, the top of the spring 643 is fixedly connected to an iron sheet seat 644, the insulation board 4 is installed on the upper surface of the iron sheet seat 644, and the electromagnet 645 is placed in the middle of the spring 643. The spring 643 and the control motor 63 are synchronously controlled.

[0049] Technical problem to be solved: The existing insulation board 4 is usually fixedly installed on the lower surface of the heating plate 3. It usually takes a long time for the initial self-heating to heat the entire heating plate 3, and the heating degree of the heating plate 3 is also uneven.

[0050] Working principle: The driving ring 65 is driven to move intermittently by controlling the motor 63, thereby driving the suspension frame 641 to move intermittently along the circumference, so as to prompt the insulation board 4 installed above the conductive rod 642 to make intermittent circular motion on the lower surface of the heating disk 3, and the sliding conductive contact between the conductive ring in the energized ring groove 612 and the brush 646 makes the insulation board 4 in motion always in a energized state, and the spring 643 pushes the iron sheet seat 644 to make the insulation board 4 fit on the lower surface of the heating disk 3 or the heat-conducting material, so that the insulation board 4 in circular motion heats the heating disk 3 evenly, During the rotation of the suspension frame 641, since the electromagnet 645 and the control motor 63 are powered at the same time, when the control motor 63 is driven, the electromagnet 645 will also be magnetic at the same time, sucking down the iron sheet seat 644, causing the insulation plate 4 to leave the lower surface of the heating disk 3 to avoid adhesion. After the control motor 63 is powered off, the electromagnet 645 will also lose its magnetism. At this time, the insulation plate 4 will continue to be adhered to the heating disk 3 under the push of the spring 643 to avoid friction between the surfaces of the insulation plate 4 and the heating disk 3 during the circular movement of the insulation plate 4, thereby affecting the service life of the heating disk 3 and the insulation plate 4.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat preservation and heating structure for an electric rice cooker, comprising a shell body (1), a heating plate (3) fixedly mounted on the inner side of the shell body (1), a pot body (2) placed above the heating plate (3), characterized in that: The bottom surface of the heating plate (3) is connected to a heat-insulating plate (4) via a heat-conducting material; two wires (5) are conductively connected to the bottom surface of the heating plate (3); the wires (5) are connected to a circuit inside the device; a driving mechanism (6) is also fixedly mounted on the bottom surface of the heating plate (3); the driving mechanism (6) is used to mount the heat-insulating plate (4); The heat preservation plate (4) comprises an electric heating element (41), the electric heating element (41) being conductively mounted on a wire (5), and the electric heating element (41) and the heating plate (3) being connected in series in a circuit via the wire (5); The driving mechanism (6) comprises an annular guide rail (61) suspended and fixedly mounted below the heating plate (3) via a heat insulation frame (62); a driving ring (65) is slidably mounted inside the annular guide rail (61); a plate mounting assembly (64) is fixedly connected to the upper surface of the driving ring (65); the heat insulation plate (4) is mounted on the plate mounting assembly (64); and a control motor (63) for driving the driving ring (65) to rotate is mounted on the outer surface of the annular guide rail (61).

2. The heat preservation and heating structure of an electric rice cooker according to claim 1, characterized in that: The electric heating element (41) is an iron-chromium alloy or a nickel-chromium alloy coil.

3. The heat preservation and heating structure of an electric rice cooker according to claim 2, characterized in that: A plurality of grooves (411) are provided on the surface of the electric heating element (41).

4. The heat preservation and heating structure of an electric rice cooker according to claim 1, characterized in that: The wire (5) connects two sides of the electric heating element (41).

5. The heat preservation and heating structure of an electric rice cooker according to claim 1, characterized in that: The upper and lower surfaces of the electric heating element (41) are respectively covered with a mica sheet (42); the outer surfaces of the two mica sheets (42) are covered with a closed cover (43); a support frame (44) is fixedly provided on the surface of the closed cover (43); and the closed cover (43) is fixed inside the housing body (1) via the support frame (44).

6. The heat preservation and heating structure of an electric rice cooker according to claim 5, characterized in that: The sealing cover (43) is made of aluminum material, and the supporting frame (44) is made of galvanized iron plate material.

7. The heat preservation and heating structure of an electric rice cooker according to claim 1, characterized in that: The conductor (5) is made of high-temperature silicone wire.

8. The heat preservation and heating structure of an electric rice cooker according to claim 1, characterized in that: The outer surface of the heating plate (3) is coated with an insulating coating.

9. The heat preservation and heating structure of an electric rice cooker according to claim 1 or 2, characterized in that: The lower surface of the annular guide rail (61) is provided with a driving groove (611), and the upper surface is provided with a mounting ring groove (613) and a pair of power-carrying ring grooves (612). A pair of connecting rods (614) are provided on the outer arc surface. A conductive ring is provided at the bottom of the power-carrying ring groove (612). The two connecting rods (614) are respectively conductively connected to the two conductive rings. The two connecting rods (614) are connected in series with the heating plate (3) via a wire (5). The lower surface of the driving ring (65) is provided with a tooth groove (651). The output end of the control motor (63) is provided with a gear, which is placed in the driving groove (611) and meshes with the tooth groove (651).

10. The heat preservation and heating structure of an electric rice cooker according to claim 9, characterized in that: The tray assembly (64) comprises a suspension frame (641) fixedly connected to the upper surface of the driving ring (65), the suspension frame (641) passes through the mounting ring groove (613) and is placed on a side of the annular guide rail (61) close to the ring center, a pair of conductive rods (642) are fixedly mounted on the surface of the suspension frame (641) above the mounting ring groove (613), brushes (646) are fixedly mounted on the lower surface of the conductive rods (642), the brushes (646) on the lower surfaces of the two conductive rods (642) respectively extend into the inner sides of the two energized ring grooves (612) and are in conductive sliding contact with the conductive ring, the conductive rods (642) are fixedly mounted on the lower surface of the conductive rods (642), and the conductive rods (642) are fixedly mounted on the lower surface of the conductive rods (642). One end of the rod (642) close to the insulation board (4) is conductively connected to the insulation board (4) via another wire (5); the other end of the suspension frame (641) is fixedly connected to the conductive rod (642); the upper surface of the conductive rod (642) is fixedly connected to a spring (643) and an electromagnet (645); the top of the spring (643) is fixedly connected to an iron sheet seat (644); the insulation board (4) is mounted on the upper surface of the iron sheet seat (644); the electromagnet (645) is placed in the middle of the spring (643); and the spring (643) and the control motor (63) are synchronously controlled.

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