Graphene heating pipe
By designing the shielding structure of electrode wires and electrode sheets in the graphene heating tube, the microwave leakage problem is solved, the safety of the equipment is improved, the effective shielding of microwaves is achieved, and the safe operation of the equipment is ensured.
Patent Information
- Application Number
- CN202420533640.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-19
AI Technical Summary
The existing graphene heating tubes have microwave leakage problems in microwave functional equipment, resulting in safety hazards.
A graphene heating tube is designed, and its electrode wire and electrode sheet form a structure that shields microwaves at the end of the inner tube. The electrode wire is spirally wound along the outer surface of the inner tube, and the electrode sheet and the end of the inner tube are connected to ensure that the microwaves do not leak.
It effectively avoids microwave leakage along the inner space of the graphene heating tube to the external environment, improving the operating safety of the equipment. The test results show that the microwave leakage volume has been reduced from 6.77 mw/cm2 to 1.81 mw/cm2, which meets the safety standards.
Smart Images
Figure CN222192579U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heating device technology, and in particular to a graphene heating tube. Background Technology
[0002] The application of graphene heating technology in oven equipment is gradually emerging in the current market, especially showing great potential in high-end multifunctional kitchen appliances. Graphene heating elements, with their superior heating efficiency and strong heat penetration, offer faster temperature rise compared to traditional metal or carbon fiber heating elements, thus attracting significant attention in the oven manufacturing industry.
[0003] Currently, one structural form of graphene heating tubes on the market consists of an outer quartz tube, an inner quartz tube, and electrode wires. Graphene material is attached to the outer surface of the inner quartz tube via screen printing, and then the inner tube is placed inside the outer tube. In this structure, the electrode wires are wound around the inner quartz tube in a helical spring shape, with leads extending from both ends to ensure power supply and fixation of the inner tube. However, this design may pose a safety hazard when used in products with integrated microwave functions, such as microwave ovens and microwave-steam-grill combos—microwaves may leak through the end face of the inner tube and the gap between the inner and outer tubes, causing microwave leakage problems. Utility Model Content
[0004] Addressing the issue of microwave leakage in graphene heating tubes within microwave-enabled cooking appliances in existing technologies, this invention provides a graphene heating tube where the electrode wires and electrode sheets at both ends form a microwave-shielding structure at the end face of the inner tube, preventing microwave leakage to the external environment along the inner tube space of the graphene heating tube.
[0005] This utility model provides a graphene heating tube, comprising:
[0006] outer tube;
[0007] An inner tube is disposed inside the outer tube, and a graphene layer is disposed on the outer surface of the inner tube;
[0008] Electrodes are located inside the outer tube and are respectively disposed at both ends of the inner tube;
[0009] The electrode includes an electrode wire and an electrode sheet; the electrode wire is spirally wound into a cylindrical section along the outer surface of the inner tube, and an outward extension section extends out of the outer tube from the end of the cylindrical section; the electrode sheet is directly opposite the end face of the inner tube and is fixedly connected to the cylindrical section.
[0010] In some embodiments, the distance between two adjacent turns of electrode wire is less than or equal to 5 mm.
[0011] In some embodiments, the cylindrical segment includes an inner spiral segment wound around the outer surface of the inner tube and an outer spiral segment located outside the end face of the inner tube; the electrode sheet is fixedly connected to the outer spiral segment.
[0012] In some embodiments, the electrode wire of the outer spiral segment is spirally wound to form a cylindrical, frustum-shaped, or cylindrical structure combining a cylinder and a frustum.
[0013] In some embodiments, the length of the inner spiral segment along the axial direction of the inner tube ranges from 5 to 25 mm; the length of the outer spiral segment along the axial direction of the inner tube ranges from 2 to 25 mm.
[0014] In some embodiments, the electrode sheet is disposed at the end of the outer spiral segment away from the inner tube.
[0015] In some embodiments, the electrode sheet is embedded between two adjacent turns of electrode wire and welded to the electrode wire for fixation.
[0016] In some embodiments, the electrode sheet has a plurality of positioning portions around its periphery, the positioning portions abutting against the outer or inner surface of the cylindrical segment and being welded and fixed to the electrode wire of the cylindrical segment.
[0017] In some embodiments, the outer surface of the inner tube is further coated with a far-infrared radiation coating.
[0018] In some embodiments, the area of the graphene layer accounts for 1 / 3 to 2 / 3 of the outer surface area of the inner tube.
[0019] Compared with the prior art, the advantages and positive effects of this utility model are:
[0020] The graphene heating tube described above has electrode wires and electrode sheets at both ends forming a structure that can shield microwaves at the end face of the inner tube, which can prevent microwaves from leaking to the external environment along the internal space of the graphene heating tube; it achieves microwave shielding by utilizing the structure of the graphene heating tube itself, thereby improving the operational safety of the equipment. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the graphene heating tube of this utility model;
[0023] Figure 2This is an exploded view of the graphene heating tube of this utility model;
[0024] Figure 3 This is a partial cross-sectional view of the graphene heating tube of this utility model;
[0025] Figure 4 This is a schematic diagram of the electrode sheet structure in the graphene heating tube of this utility model;
[0026] Explanation of reference numerals in the attached figures:
[0027] Graphene heating element 100;
[0028] External tube 110;
[0029] Inner tube 120;
[0030] Electrode wire 130; Inner spiral section 131; Outer spiral section 132; Lead-out section 133;
[0031] Electrode sheet 140; positioning part 141. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.
[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0036] Reference Figures 1-4 This is one embodiment of the graphene heating tube of this utility model.
[0037] The graphene heating tube 100 includes an outer tube 110, an inner tube 120, and electrodes located at both ends of the inner tube, which are nested together.
[0038] Both the outer tube 110 and the inner tube 120 are quartz tubes. The inner tube 120 is disposed inside the outer tube 110, and a graphene layer is disposed on the outer surface of the inner tube 120. The graphene material can be screen-printed onto the outer surface of the inner tube 120 to form a graphene layer.
[0039] Electrodes are located inside the outer tube 110 and are respectively disposed at both ends of the inner tube 120. One end of the electrode is wound around the outer surface of the inner tube 120 and connected to the graphene layer, while the other end is led out of the outer tube 110 for connection with a wire. The electrode serves to conduct electricity, transferring current to the graphene material, and also serves to fix the inner tube 120.
[0040] Specifically, the electrode includes an electrode wire 130 and an electrode sheet 140.
[0041] Electrode wire 130 is spirally wound outward along the outer surface of inner tube 120 to form a cylindrical segment. A lead-out section 133 extends outward from the end of the cylindrical segment, protruding from outer tube 110 for wire connection. Electrode plate 140 is directly opposite the end face of inner tube 120 and is fixedly connected to the cylindrical segment. That is, the end of inner tube 120 is enclosed within the cylindrical segment formed by the wound electrode wire 130 and the interior of electrode plate 140.
[0042] In the aforementioned electrodes, the cylindrical segment formed by the spiral winding of the electrode wire 130 can be a cylindrical shape, a frustum-shaped cylinder, or a combination of a cylindrical and a frustum-shaped cylinder. The electrode sheet 140 is a flat disc, or a disc with a slightly convex or concave center. The electrode wire of the lead-out segment 133 extends outward from the cylindrical segment, and is approximately in a straight line shape.
[0043] Since both the electrode wire 130 and the electrode sheet 140 are made of metal, the electrode sheet can provide microwave shielding for the end face of the inner tube 120, preventing microwaves from leaking outward along the internal space of the inner tube 120.
[0044] Testing revealed that the original graphene heating tube, when installed in the microwave oven, had a microwave leakage of 6.77 mw / cm² (the testing standard requires that the microwave leakage should not exceed 5 mw / cm²). However, using the graphene heating tube 100 of this invention, the microwave leakage was reduced to 1.81 mw / cm², significantly lowering the leakage and meeting the standard requirements.
[0045] The graphene heating tube 100 described above has an electrode wire 130 and electrode sheet 140 at both ends forming a microwave shielding structure at the end face of the inner tube 120. This prevents microwaves from leaking into the external environment along the internal space of the inner tube 120 of the graphene heating tube 100. The graphene heating tube 100 itself achieves microwave shielding, thus improving the operational safety of the equipment.
[0046] To prevent microwaves from leaking out from the internal space of the inner tube 120 along the gaps between each coil of electrode wire, the distance between two adjacent coils of electrode wire should be less than or equal to 5 mm.
[0047] In this embodiment, as Figure 3 As shown, the cylindrical section includes an inner spiral section 131 wound around the outer surface of the inner tube 120 and an outer spiral section 132 located outside the end face of the inner tube 120. The electrode sheet 140 is fixedly connected to the outer spiral section 132.
[0048] The electrode plate 140 can be set at any position on the outer spiral section 132. Preferably, the electrode plate 140 is set at the end position away from the inner tube 120, which facilitates installation and fixation.
[0049] In this embodiment, the electrode sheet 140 is embedded between two adjacent turns of the electrode wire and welded to the electrode wire. That is, the diameter of the electrode sheet 140 is slightly larger than the outer diameter of the cylindrical section. The electrode sheet 140 can be inserted between the electrode wires at adjacent ends for initial fixation, which facilitates the welding and fixation of the electrode sheet 140 and the electrode wire 130.
[0050] To prevent the electrode plate 140 from detaching from the cylindrical section, such as Figure 4 As shown, the electrode sheet 140 has multiple positioning parts 141 around its periphery. The positioning parts 141 are preferably L-shaped claws. The positioning parts 141 can abut against the outer or inner surface of the cylindrical section to achieve positioning and prevent the electrode sheet 140 from falling off the electrode wire. Finally, the positioning parts 141 can be welded and fixed to the electrode wire of the cylindrical section.
[0051] Both electrode wire 130 and electrode sheet 140 are made of metallic materials, such as tungsten, molybdenum and their alloys; platinum, gold, silver, palladium, iridium and their alloys; copper, etc. Preferably, electrode wire 130 and electrode sheet 140 are made of the same metallic material.
[0052] In this embodiment, the length L1 of the inner spiral section 131 along the axial direction of the inner tube 120 ranges from 5 to 25 mm, preferably from 5 to 15 mm. If this length is too small, the number of electrode wire turns wound on the inner tube 120 will be reduced, and the inner tube 120 will not be effectively fixed; if this length is too large, it will result in a waste of electrode wire material and increase costs.
[0053] The length L2 of the outer spiral section 132 along the axial direction of the inner tube 120 ranges from 2 to 25 mm, preferably from 2 to 15 mm. If this length is too small, the electrode wire on the outside of the inner tube 120 will be too short and will not be able to extend out of the inner shell when installed on the inner liner of the equipment, causing microwave leakage from the end of the outer tube 110. If this length is too large, it will not only waste electrode wire material and increase costs, but also increase the length of the outer tube 110 and relatively reduce the length of the inner tube 120, thus reducing heating efficiency.
[0054] In this embodiment, both the inner tube 120 and the outer tube 110 are circular tubes. The cylindrical shape formed by the electrode wire winding of the outer spiral section 132 is equal in diameter to the cylindrical structure formed by the inner spiral section 131 winding the inner tube 120. The electrode wires of the outer spiral section 132 and the inner spiral section 131 are wound to the same size, which facilitates processing and manufacturing.
[0055] In another embodiment, the cylindrical segment may be entirely wrapped around the outer surface of the inner tube 120.
[0056] In this embodiment, the outer surface of the inner tube 120 is also coated with a far-infrared radiation coating. Preferably, the area of the graphene layer accounts for 1 / 3 to 2 / 3 of the outer surface area of the inner tube 120. By coating with a far-infrared radiation coating, the graphene power density can be increased, thereby increasing the overall heating efficiency.
[0057] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.
Claims
1. A graphene heating tube, It is characterized in that include: External pipe; An inner tube is arranged inside the outer tube, and a graphene layer is arranged on the outer surface of the inner tube; Electrodes are located inside the outer tube and are respectively arranged on two ends of the inner tube; The electrode comprises an electrode wire and an electrode sheet; the electrode wire is spirally wound along the outer surface of the inner tube to form a cylindrical section, the end of the cylindrical section is led outward to form a lead-out section, and the lead-out section extends out of the outer tube; the electrode sheet is directly opposite to the end face of the inner tube and is fixedly connected to the cylindrical section.
2. The graphene heating tube according to claim 1, It is characterized in that The distance between two adjacent turns of electrode wire is less than or equal to 5 mm.
3. The graphene heating tube according to claim 1, It is characterized in that The cylindrical section includes an inner spiral section wound around the outer surface of the inner tube and an outer spiral section located outside the end surface of the inner tube; the electrode sheet is fixedly connected to the outer spiral section.
4. The graphene heating tube according to claim 3, It is characterized in that The electrode wire of the outer spiral section is spirally wound to form a cylindrical structure, a truncated cone-shaped cylinder, or a cylindrical structure combining a cylinder and a truncated cone.
5. The graphene heating tube according to claim 3, It is characterized in that The length of the inner spiral section along the axial direction of the inner tube is in the range of 5-25 mm; the length of the outer spiral section along the axial direction of the inner tube is in the range of 2-25 mm.
6. The graphene heating tube according to claim 3, It is characterized in that The electrode sheet is arranged at the end position of the outer spiral section away from the inner tube.
7. The graphene heating tube according to claim 3, It is characterized in that The electrode sheet is embedded between two adjacent circles of electrode wire and is fixed by welding with the electrode wire.
8. The graphene heating tube according to claim 7, It is characterized in that The electrode sheet has a plurality of positioning parts around its periphery, and the positioning parts abut against the outer surface or the inner surface of the cylindrical section and are fixed by welding to the electrode wire of the cylindrical section.
9. The graphene heating tube according to claim 1, It is characterized in that The outer surface of the inner tube is also coated with far-infrared radiation paint.
10. The graphene heating tube according to claim 9, It is characterized in that The area of the graphene layer accounts for 1 / 3-2 / 3 of the outer surface area of the inner tube.