A heat belt structure

Abstract

The utility model provides a kind of heating band structure, including heating unit, insulating unit, wrapping unit and wire, heating unit includes intermediate insulating sheet and heating wire wound on intermediate insulating sheet, insulating unit includes the first insulating sheet and second insulating sheet being set to the two sides of heating unit, and the insulating limit piece for limiting intermediate insulating sheet longitudinal movement, insulating limit piece is assembled on intermediate insulating sheet, and the side edge of insulating limit piece is in contact with wrapping unit, wrapping unit is wrapped and fixed insulating unit and heating unit, two sections of wire are electrically connected with heating wire two ends by wrapping unit and second insulating sheet in turn respectively.This setting can effectively limit the up and down movement of intermediate insulating sheet, so as to avoid the contact between heating wire on intermediate insulating sheet and metal material in wrapping unit, not only meet the requirement of electrical safety specification, but also fundamentally eliminate the security risk caused by displacement of insulating material.

Description

Technical Field

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

[0002] In existing electric slow cookers, the structure typically consists of a pot body, an outer pot installed inside the pot body, a ceramic inner pot placed inside the outer pot, and a heating system. The heating system includes a PTC heater and a heating tape; the PTC heater heats the bottom of the outer pot, while the heating tape heats the sides of the outer pot. However, the installation of the heating tape must strictly adhere to safety regulations, requiring it to possess both heating and insulation functions.

[0003] Taking Chinese utility model patent CN204133249U as an example, this patent discloses a safe and reliable heating coil (i.e., heating coil) for a slow cooker. The heating coil mainly consists of a heating unit, an insulating unit, and a wrapping unit for fixing and wrapping the heating unit and the insulating unit. Specifically, the heating unit includes a central mica sheet and a heating wire wound around the mica sheet; the insulating unit includes an upper insulating mica sheet and a lower insulating mica sheet respectively disposed on both sides of the heating unit; the wrapping unit consists of galvanized sheets respectively disposed on both sides of the insulating unit and an outer aluminum sheath. It is worth noting that the heating coil has a ceramic bead between the galvanized sheet and the upper insulating mica sheet. One end of the ceramic bead passes through a hole in the galvanized sheet, while one end of the heat-resistant wire passes through the galvanized sheet, the upper insulating mica sheet, and the ceramic bead, and is spliced ​​to the beginning or end of the heating wire wound around the central mica sheet. Furthermore, the spliced ​​portion of the heat-resistant wire and the beginning or end of the heating wire also needs to pass through small holes in the central mica sheet and then be bent and fixed to the central mica sheet.

[0004] Although the heating coil described above has improved insulation and safety, it still has certain drawbacks. Because the middle mica sheet is elongated and fixed only at both ends, the middle section is prone to vertical movement between the upper and lower insulating mica sheets, posing a risk of leakage. Therefore, the existing technology still needs further improvement and development. Utility Model Content

[0005] The purpose of this invention is to provide a heating structure with higher safety in order to address the defects and shortcomings of the existing technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a heating tape structure, which is fixed to the side wall of the outer pot of an electric slow cooker. It achieves uniform heating of the side of the pot body through efficient heat conduction. Specifically, the structure includes a heating unit, an insulation unit, a wrapping unit, and wires. The heating unit includes an intermediate insulating sheet and a heating wire wound on the intermediate insulating sheet. The insulation unit includes a first insulating sheet and a second insulating sheet disposed on both sides of the heating unit. The wrapping unit wraps and fixes the insulation unit and the heating unit. The wires pass through the wrapping unit and the second insulating sheet in sequence and are electrically connected to the heating wire. More specifically, multiple sets of wires and heating wires can be set according to the power requirements of the heating tape. The first insulating sheet, the intermediate insulating sheet, and the second insulating sheet are sequentially stacked and assembled inside the wrapping unit, and all three insulating sheets are long strip-shaped structures. The wrapping unit must simultaneously meet dual functional requirements: firstly, it acts as a carrier to fix and wrap the insulating sheet assembly; secondly, it acts as a heat conduction medium to achieve efficient heat conduction. To achieve the above functions, the side of the wrapping unit that is in close contact with the outer pot is made of a high thermal conductivity metal material (such as aluminum alloy, aluminum metal, etc.) to optimize heat conduction efficiency; the side that is away from the outer pot is made of a metal material with anti-corrosion properties (such as coated metal) to effectively prevent the performance degradation of internal metal components due to humid environment or high temperature oxidation.

[0007] The insulating unit also includes an insulating limiting member for restricting the longitudinal movement (i.e., vertical movement) of the intermediate insulating sheet. The insulating limiting member is mounted on the intermediate insulating sheet, and its two sides abut against the wrapping unit. As described in the background art, the long strip-shaped intermediate insulating sheet is disposed between the first and second insulating sheets. Because it lacks a fixed support point in its middle, it is prone to longitudinal displacement during operation. By adding an insulating limiting member, the vertical movement of the intermediate insulating sheet can be effectively restricted, thereby preventing its displacement from contacting the metal material in the wrapping unit. This structural design not only meets the requirements of electrical safety specifications, but also fundamentally eliminates safety hazards caused by the displacement of insulating materials.

[0008] According to the above scheme, the insulating limiting member is a U-shaped sheet structure, and the intermediate insulating sheet is inserted through the U-shaped sheet structure. More specifically, after the intermediate insulating sheet is inserted through the insulating limiting member, the insulating limiting member and the intermediate insulating sheet are stacked. This arrangement can effectively reduce the heat conduction path between the insulating limiting member and the heating unit. In addition, the intermediate insulating sheet is directly inserted into the hollow area of ​​the U-shaped sheet structure, which makes assembly quick and significantly improves assembly efficiency.

[0009] According to the above scheme, the wrapping unit includes an aluminum plate and a galvanized plate. An upper mounting groove and a lower mounting groove are formed on the upper and lower sides of the aluminum plate, respectively. The first insulating sheet, the middle insulating sheet, the second insulating sheet, and the galvanized plate are sequentially stacked and assembled on the surface of the aluminum plate. The upper sides of the first insulating sheet, the second insulating sheet, and the galvanized plate are all embedded in the upper mounting groove, and the lower sides of the first insulating sheet, the second insulating sheet, and the galvanized plate are all embedded in the lower mounting groove. The upper side of the insulating limiting member abuts against the bottom of the upper mounting groove, and the lower side of the insulating limiting member abuts against the bottom of the lower mounting groove. Through the above structural arrangement, the aluminum plate and the galvanized plate can be used to securely wrap the insulating unit and the heating unit.

[0010] According to the above scheme, the insulating limiting member is a rectangular loop-shaped plate structure. The upper edge of the rectangular loop-shaped plate structure abuts against the bottom of the upper mounting groove, and the lower edge of the rectangular loop-shaped plate structure abuts against the bottom of the lower mounting groove. Through this structural arrangement, effective frictional resistance can be generated between the upper and lower edges of the rectangular loop-shaped plate structure and the bottom of the mounting groove, thereby reliably limiting the displacement of the insulating limiting member along the length direction of the intermediate insulating plate.

[0011] According to the above scheme, the intermediate insulating sheet, the first insulating sheet, the second insulating sheet, and the insulating limiting component are all mica sheet structures. As the insulating material inside the heating tape, the mica sheet effectively isolates the current in the circuit, prevents short circuits, and ensures the safe operation of electrical equipment. Furthermore, the mica sheet is tough, possesses high tensile strength and wear resistance, and can extend the service life of the heating tape. According to the above scheme, two insulating limiting components are provided. It should be noted that the number of insulating limiting components can be flexibly adjusted according to the length of the intermediate insulating sheet, and can be set to one or more to ensure that the intermediate insulating sheet remains stable and does not shift during use. In this embodiment, two insulating limiting components are used and are symmetrically distributed on both sides of the intermediate insulating sheet.

[0012] According to the above scheme, both ends of the heating wire are provided with leads. The first ends of the two sections of the leads are respectively connected to the positive and negative terminals of the external power supply, and the second ends of the two sections of the leads are respectively connected to the leads at both ends of the heating wire.

[0013] According to the above scheme, the second ends of the two sections of the conductor are respectively connected to the leads at both ends of the heating wire via terminals. This structural design improves the ease of connecting the conductor to the heating wire.

[0014] According to the above scheme, the terminal block passes through the second insulating sheet and connects to the lead wire. The connection between the terminal block and the lead wire is fixed to the intermediate insulating sheet using a tubular copper rivet. More specifically, both ends of the intermediate and second insulating sheets have through holes for placing the tubular copper rivet. When stamping the tubular copper rivet, the two ends of the intermediate insulating sheet can be simultaneously fixed to the second insulating sheet. With the above structural design, the wire is less likely to fall off when fixed with tubular copper rivets, which meets safety regulations.

[0015] According to the above scheme, the longitudinal widths of the first insulating sheet, the second insulating sheet, and the galvanized sheet are consistent, and the distance between the bottoms of the upper and lower mounting grooves of the aluminum sheet is the same as the longitudinal width of the galvanized sheet. The longitudinal width of the first insulating sheet must be at least 8mm larger than that of the intermediate insulating sheet. During assembly, both ends of the intermediate insulating sheet are fixed to the second insulating sheet, and its longitudinal position is ensured to be stable by insulating limiting components. This achieves that the distance between the upper and lower ends of the intermediate insulating sheet and the corresponding ends of the first and second insulating sheets is greater than 4mm, meeting the electrical safety specifications for insulation gaps.

[0016] According to the above scheme, spring hook mounting positions are provided at both ends of the galvanized sheet. In actual assembly, a spring assembly with hooks at both ends should be selected. After the heating cable is arranged around the outside of the outer pot, the hooks at both ends of the springs should be engaged with the spring hook mounting positions at both ends of the galvanized sheet to complete the winding and fixing of the heating cable.

[0017] The beneficial effects of this utility model are: This invention provides a highly safe heating tape structure. The structure incorporates an insulation limiting component, which effectively restricts the vertical movement of the intermediate insulating sheet, thereby preventing the heating wire on the intermediate insulating sheet from contacting the metal material in the wrapping unit. This structural design not only meets electrical safety regulations but also fundamentally eliminates safety hazards caused by the displacement of the insulating material. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is a schematic diagram of the external structure of this utility model; Figure 3 This is a schematic diagram of the heating unit of this utility model.

[0019] In the diagram: 1. Aluminum plate; 2. First insulating sheet; 3. Middle insulating sheet; 4. Heating wire; 5. Second insulating sheet; 6. Galvanized sheet; 7. Wire; 8. Insulating limiting component; 9. Tubular copper rivet; 10. Spring hook mounting position; 11. Upper mounting groove; 12. Lower mounting groove. Detailed Implementation

[0020] The technical solution of this utility model will be described below with reference to the accompanying drawings and embodiments. Example

[0021] like Figure 1-3 As shown, this utility model provides a heating structure, which is fixed to the side wall of the outer pot of an electric slow cooker. It achieves uniform heating of the side of the pot body through efficient heat conduction. Specifically, the structure includes a heating unit, an insulation unit, a wrapping unit, and wires 7. The heating unit includes an intermediate insulating sheet 3 and a heating wire 4 wound on the intermediate insulating sheet 3. The insulation unit includes a first insulating sheet 2 and a second insulating sheet 5 disposed on both sides of the heating unit. The wrapping unit wraps and fixes the insulation unit and the heating unit. The two sections of the wires 7 pass through the wrapping unit and the second insulating sheet 5 respectively and are electrically connected to the two ends of the heating wire 4.

[0022] The insulating unit also includes an insulating limiting member 8 for restricting the longitudinal movement of the intermediate insulating sheet 3. The insulating limiting member 8 is assembled on the intermediate insulating sheet 3, and its two sides abut against the wrapping unit. As described in the background art, the elongated sheet-like intermediate insulating sheet 3 is disposed between the first insulating sheet 2 and the second insulating sheet 5. Due to the lack of a fixed support point in its middle, it is prone to longitudinal displacement during operation. By adding the insulating limiting member 8, the vertical movement of the intermediate insulating sheet 3 can be effectively restricted, thereby preventing the heating wire 4 on the intermediate insulating sheet 3 from contacting the metal material in the wrapping unit. This structural design not only meets the requirements of electrical safety specifications but also fundamentally eliminates safety hazards caused by the displacement of insulating materials.

[0023] Furthermore, the insulating limiting member 8 is a loop-shaped structure, and the intermediate insulating piece 3 passes through the loop-shaped structure. More specifically, as shown... Figure 1 and 3 As shown, the intermediate insulating sheet 3 is inserted through the insulating limiting member 8, and the insulating limiting member 8 and the intermediate insulating sheet 3 are stacked together. This arrangement can effectively reduce the heat conduction path between the insulating limiting member 8 and the heating unit. In addition, the intermediate insulating sheet 3 is directly inserted into the hollow area of ​​the U-shaped sheet structure, which makes assembly quick and significantly improves assembly efficiency.

[0024] Furthermore, the wrapping unit includes an aluminum plate 1 and a galvanized plate 6. The aluminum plate 1 has an upper mounting groove 11 and a lower mounting groove 12 formed on its upper and lower sides, respectively. The first insulating sheet 2, the middle insulating sheet 3, the second insulating sheet 5, and the galvanized plate 6 are sequentially stacked and assembled on the surface of the aluminum plate 1. The upper sides of the first insulating sheet 2, the second insulating sheet 5, and the galvanized plate 6 are all embedded in the upper mounting groove 11, and the lower sides of the first insulating sheet 2, the second insulating sheet 5, and the galvanized plate 6 are all embedded in the lower mounting groove 12. The upper side of the insulating limiting member 8 abuts against the bottom of the upper mounting groove 11, and the lowermost side of the insulating limiting member 8 abuts against the bottom of the lower mounting groove 12. Through this structural arrangement, the aluminum plate 1 and the galvanized plate 6 can be used to securely wrap the insulating unit and the heating unit.

[0025] Furthermore, the insulating limiting member 8 is a rectangular loop-shaped plate structure. The upper edge of the rectangular loop-shaped plate structure abuts against the bottom of the upper mounting groove 11, and the lower edge of the rectangular loop-shaped plate structure abuts against the bottom of the lower mounting groove 12. Through the above structural arrangement, effective frictional resistance can be generated between the upper and lower edges of the rectangular loop-shaped plate structure and the bottom of the mounting groove, thereby reliably limiting the displacement of the insulating limiting member 8 along the length direction of the intermediate insulating plate 3.

[0026] Furthermore, the intermediate insulating sheet 3, the first insulating sheet 2, the second insulating sheet 5, and the insulating limiting member 8 are all mica sheet structures. As the insulating material inside the heating tape, the mica sheet effectively isolates the current in the circuit, prevents short circuits, and ensures the safe operation of electrical equipment. Moreover, the mica sheet is tough, has high tensile strength and wear resistance, and can extend the service life of the heating tape. Furthermore, two insulating limiting members 8 are provided. It should be noted that the number of insulating limiting members 8 can be flexibly adjusted according to the length of the intermediate insulating sheet 3, and can be set to one or more, to ensure that the intermediate insulating sheet 3 remains stable and does not shift during use. In this embodiment, two insulating limiting members 8 are used and are symmetrically distributed on both sides of the intermediate insulating sheet 3.

[0027] Furthermore, both ends of the heating wire 4 are provided with leads. The first ends of the two sections of the conductor 7 are respectively connected to the positive and negative terminals of an external power supply, and the second ends of the two sections of the conductor 7 are respectively connected to the leads at both ends of the heating wire 4. The second ends of the two sections of the conductor 7 are respectively connected to the leads at both ends of the heating wire 4 through terminals. The terminals pass through the second insulating sheet 5 and are connected to the leads. The connection between the terminals and the leads is fixed to the intermediate insulating sheet 3 by tubular copper rivets 9. More specifically, the intermediate insulating sheet 3 and the second insulating sheet 5 have through holes at both ends for placing the tubular copper rivets 9. When stamping the tubular copper rivets 9, the two ends of the intermediate insulating sheet 3 can be fixedly connected to the second insulating sheet 5 simultaneously. Through the above structural design, the convenience of connecting the conductor 7 to the heating wire 4 is improved, and the use of tubular copper rivets 9 to fix the conductor 7 makes it less likely to fall off, which meets safety requirements.

[0028] Furthermore, the longitudinal widths of the first insulating sheet 2, the second insulating sheet 5, and the galvanized plate 6 are consistent, and the distance between the bottoms of the upper and lower mounting grooves 12 of the aluminum sheet is the same as the longitudinal width of the galvanized plate 6. Specifically, the longitudinal width of the first insulating sheet 2 must be at least 8mm greater than that of the intermediate insulating sheet 3. During assembly, the two ends of the intermediate insulating sheet 3 are fixed to the second insulating sheet 5, and its longitudinal position is ensured to be stable by the insulating limiting component 8. This achieves that the distance between the upper and lower ends of the intermediate insulating sheet 3 and the corresponding ends of the first and second insulating sheets 2 and 5 is greater than 4mm, meeting the electrical safety specifications for insulation gaps.

[0029] Furthermore, both ends of the galvanized sheet are provided with spring hook mounting positions 10. In actual assembly, a spring assembly with hooks at both ends should be selected. After the heating cable is arranged around the outside of the outer pot, the hooks at both ends of the spring are respectively engaged with the spring hook mounting positions 10 at both ends of the galvanized sheet to complete the winding and fixing of the heating cable.

[0030] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A heating element structure, comprising a heating unit, an insulating unit, a wrapping unit, and wires (7), wherein the heating unit comprises an intermediate insulating sheet (3) and a heating wire (4) wound on the intermediate insulating sheet (3), the insulating unit comprises a first insulating sheet (2) and a second insulating sheet (5) disposed on both sides of the heating unit, the wrapping unit wraps and fixes the insulating unit and the heating unit, and two sections of the wire (7) pass sequentially through the wrapping unit and the second insulating sheet (5) and are electrically connected to both ends of the heating wire (4), characterized in that, The insulating unit also includes an insulating limiting member (8) for restricting the longitudinal movement of the intermediate insulating sheet (3), the insulating limiting member (8) being assembled on the intermediate insulating sheet (3), and the insulating limiting member (8) having its two sides abutting against the wrapping unit.

2. The heating structure according to claim 1, characterized in that, The insulating limiting member (8) is a spiral-shaped structure, and the intermediate insulating piece (3) is inserted through the spiral-shaped structure.

3. The heating structure according to claim 2, characterized in that, The packaging unit includes an aluminum plate (1) and a galvanized plate (6). The upper and lower sides of the aluminum plate (1) are respectively formed with an upper mounting groove (11) and a lower mounting groove (12). The first insulating sheet (2), the middle insulating sheet (3), the second insulating sheet (5) and the galvanized plate (6) are sequentially stacked and assembled on the surface of the aluminum plate (1). The upper sides of the first insulating sheet (2), the second insulating sheet (5) and the galvanized plate (6) are all embedded in the upper mounting groove (11), and the lower sides of the first insulating sheet (2), the second insulating sheet (5) and the galvanized plate (6) are all embedded in the lower mounting groove (12). The upper side of the insulating limiting member (8) abuts against the bottom of the upper mounting groove (11), and the lower side of the insulating limiting member (8) abuts against the bottom of the lower mounting groove (12).

4. The heating structure according to claim 3, characterized in that, The insulating limiting member (8) is a rectangular loop-shaped piece structure. The upper edge of the rectangular loop-shaped piece structure abuts against the bottom of the upper mounting groove (11), and the lower edge of the rectangular loop-shaped piece structure abuts against the bottom of the lower mounting groove (12).

5. The heating structure according to claim 2, characterized in that, The insulating limiting element (8) is a mica sheet.

6. The heating structure according to claim 1, characterized in that, Two insulating limiting members (8) are provided.

7. The heating structure according to claim 1, characterized in that, Both ends of the heating wire (4) are provided with leads. The first ends of the two sections of the wire (7) are respectively connected to the positive and negative poles of the external power supply, and the second ends of the two sections of the wire (7) are respectively connected to the leads at both ends of the heating wire (4).

8. The heating structure according to claim 7, characterized in that, The second ends of the two sections of the conductor (7) are respectively connected to the leads at both ends of the heating wire (4) through the terminal blocks.

9. The heating structure according to claim 8, characterized in that, The terminal block passes through the second insulating sheet (5) and is connected to the lead wire. The connection between the terminal block and the lead wire is fixed to the intermediate insulating sheet (3) by a tubular copper rivet (9).

10. The heating structure according to claim 1, characterized in that, The intermediate insulating sheet (3), the first insulating sheet (2), and the second insulating sheet (5) are all mica sheets.

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