Heating tube and cooking equipment

Abstract

The invention discloses a heating tube and cooking equipment, and the heating tube comprises a tube body which comprises a tube main body part and tube press sealing parts, and the two ends of the tube main body part are provided with the tube press sealing parts; the heating piece is a graphene material piece, the heating piece is arranged in the pipe body in a penetrating mode, and the pipe pressing and sealing part is in press fit with the end of the heating piece so as to define a vacuum space in the pipe main body part; the total length of the pipe body is L1, the wall thickness of the vacuum space is T1, and (T1 / L1) is larger than or equal to 5.7 e <-3 > and smaller than or equal to 7.7 e <-3 >. The ratio of the total length of the tube body to the wall thickness of the vacuum space is set in the range of 5.7 e-3 to 7.7 e-3, so that the strength of the heating tube is improved, the material consumption of the tube body is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking devices, in particular to a heating tube and cooking equipment. Background Art

[0002] In the related art, graphite heating tubes are subjected to various forces during the manufacturing and use processes. For example, the glass tube is subjected to atmospheric pressure during the vacuum process during the manufacturing process, and both ends of the graphite heating tube are subjected to forces during use. Under the condition of the same length, in order to meet the requirements of the above-mentioned various working conditions, the glass tube of the graphite heating tube is usually thicker, resulting in increased costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heating pipe to reduce costs.

[0004] According to an embodiment of the present invention, a heat pipe includes: a pipe body, the pipe body including a pipe main body and a pipe pressure seal, the pipe pressure seal being provided at both ends of the pipe main body; a heating element, the heating element being a graphene material element and being disposed through the pipe body, the pipe pressure seal being press-fitted with an end portion of the heating element to define a vacuum space within the pipe main body; the total length of the pipe body is L1, the wall thickness of the vacuum space is T1, and 5.7e-3 ≤ (T1 / L1) ≤ 7.7e-3.

[0005] According to the heat pipe of the embodiment of the present invention, by setting the ratio between the total length of the tube body and the wall thickness of the vacuum space within the range of 5.7e-3 to 7.7e-3, the strength of the heat pipe is improved while the material used for the tube body is reduced, thereby reducing costs.

[0006] In some embodiments, the minimum distance between the end of the tube press-sealed portion away from the vacuum space and the tube main body is L2, the thickness of the tube press-sealed portion is T2, and 0.13≤(T2 / L2)≤0.33.

[0007] In some embodiments, the tube main body includes a middle part and a transition part, and both ends of the middle part are respectively connected to the tube pressure sealing part through the transition parts. In the direction toward the tube pressure sealing part, the transition part extends obliquely or the transition part is formed into a curved surface, and the length L2 is the minimum distance from the end of the tube pressure sealing part away from the vacuum space to the transition part.

[0008] In some embodiments, the transition portion is transitionally connected to the middle portion and the tube compression sealing portion curved surface respectively.

[0009] In some embodiments, in the thickness direction of the tube pressure sealing portion, the tube pressure sealing portion has a first surface arranged opposite to each other, and the connection between the transition portion and the tube pressure sealing portion forms a first edge line, and both ends of the first edge line respectively intersect with the edges of the first surface.

[0010] In some embodiments, the first edge line is formed as a curve, and the transition portion further has a second edge line connected to the main body of the tube, the second edge line intersects the first edge line at an intersection, and the tangent of the intersection has an angle θ1 with the center line of the tube body, 10°≤θ1≤40°.

[0011] In some embodiments, the heating element is formed in a sheet shape.

[0012] In some embodiments, the tube body has at least one bending portion, which is formed in an arc shape, and a reference line is defined that passes through the center of the bending portion and is arranged perpendicular to the radius of the bending portion. In the thickness direction of the heating element, the heating element has a neutral plane located in the center, and the neutral plane extends along the length direction of the tube body. At least the portion of the neutral plane that is opposite to the bending portion is arranged parallel to the reference line.

[0013] In some embodiments, the curvature radius of the central axis of the bending portion is R1, the curvature radius of a portion of the neutral plane directly opposite to the bending portion is R2, and 0.95≤(R2 / R1)≤1.05.

[0014] In some embodiments, both ends of the heating element in the longitudinal direction are connected to connecting terminals, each of the connecting terminals is press-sealed and fixed to the tube body, and a portion of the connecting terminal extends out of the tube body.

[0015] In some embodiments, the connecting terminal includes a terminal body and a packaging portion, the terminal body is connected to the heating element, the packaging portion is connected to the terminal body and is sealed and fixed to the tube body, and the terminal body and the packaging portion have an angle.

[0016] In some embodiments, the terminal body portion and the packaging portion are vertically arranged.

[0017] In some embodiments, the heating element includes a plurality of heating units sequentially arranged along the length direction, each of the heating units is formed as a curved section with an opening facing the first direction, and adjacent heating units are connected by a connecting piece.

[0018] A cooking device according to an embodiment of the present invention includes the above-mentioned heating tube.

[0019] According to the cooking device of the embodiment of the present invention, by setting the ratio between the total length of the tube body and the wall thickness of the vacuum space within the range of 5.7e-3 to 7.7e-3, the strength of the heating tube is improved while the material used for the tube body is reduced, thereby reducing costs.

[0020] In some embodiments, the cooking device includes: a box body, a pull-out opening is provided on the front side of the box body; a pull-out piece for holding food, the pull-out piece can be pulled out relative to the box body through the pull-out opening; and a heating tube, the heating tube is provided in the box body to heat the inside of the box body.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 An exploded view of a heating tube according to an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of L1 and L2 in an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the wall thickness of the vacuum space in an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the thickness of the tube press seal portion in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a transition portion and an intermediate portion in an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of a heat pipe in an embodiment of the present invention Figure 1 ;

[0029] Figure 7 Schematic diagram of the heat pipe in the embodiment of the present invention Figure 2 ;

[0030] Figure 8 for Figure 7 A partial enlarged view of point I in the middle;

[0031] Figure 9 is a schematic diagram of a sheet-shaped heating element in an embodiment of the present invention;

[0032] Figure 10 Schematic diagram of the forming of the tube sealing portion in an embodiment of the present invention, wherein the pressing block has not yet been pressed onto the tube body;

[0033] Figure 11 for Figure 10 Schematic diagram of the curvature of the central axis of each part of the tube body;

[0034] Figure 12 for Figure 10 Schematic diagram of the sweep path formed after the heating element is positioned in the tube body;

[0035] Figure 13 Schematic diagram of the cooperation between the heating element and the U-shaped tube in an embodiment of the present invention;

[0036] Figure 14 Schematic diagram of the cooperation between the heating element and the S-shaped tube in an embodiment of the present invention;

[0037] Figure 15 Schematic diagram of the angle θ2 in the first embodiment of the present invention;

[0038] Figure 16 Schematic diagram of the angle θ2 in the second embodiment of the present invention;

[0039] Figure 17 Schematic diagram of the angle θ2 in the third embodiment of the present invention;

[0040] Figure 18 Schematic diagram of the cooperation between the heating element and the straight tube in an embodiment of the present invention;

[0041] Figure 19 for Figure 18 A partial enlarged view of point II in the middle.

[0042] Reference numerals:

[0043] 100. Heating tube;

[0044] 10. Tube body; 11. Bend portion; 12. Tube main body; 121. Middle portion; 122. Transition portion; 1221. Second edge line; 13. Tube press seal portion; 131. First surface; 1311. First edge line;

[0045] 20. Heating element; 22. Heating unit; 23. Connecting terminal; 231. Terminal body; 232. Encapsulation portion; 24. Connecting piece;

[0046] F1, neutral surface; F2, pressing block. DETAILED DESCRIPTION

[0047] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0048] The heat pipe 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0049] like Figures 1 to 3 As shown, the heat pipe 100 according to an embodiment of the present invention includes a pipe body 10 and a heating element 20 .

[0050] The tube body 10 includes a tube main body 12 and a tube compression sealing portion 13 . The tube compression sealing portion 13 is provided at both ends of the tube main body 12 .

[0051] The heating element 20 is made of graphene and is inserted into the tube body 10. The tube seal 13 is pressed together with the end of the heating element 20 to define a vacuum space within the tube body 12. This vacuum space isolates the heating element 20 from the external environment, protecting it and improving the reliability and lifespan of the heat pipe 100.

[0052] For example, the tube body 10 is heated to a molten state. The molten tube body 10 is compressed under pressure to define a vacuum space. The tube body 10 cools, and the shape of the tube body 10 itself is fixed, thereby maintaining the vacuum space. The tube sealing portion 13 can be pressed together with the end of the heating element 20 by pressing the tube body 10 itself onto the connecting terminal 23 provided on the end of the heating element 20, or directly pressed onto the heating element 20.

[0053] Among them, the graphene material piece itself has excellent thermal conductivity and heat dissipation capabilities. The heat pipe 100 of the present application utilizes the capabilities of the graphene material piece. The graphene material piece is arranged in a vacuum space. The carbon atoms on the graphene material piece rub against each other, thereby generating heat. The graphene material piece itself dissipates heat, making the heat pipe 100 have the advantages of fast heating speed and strong radiation.

[0054] The total length of the tube body 10 is L1, the wall thickness of the vacuum space is T1, and 5.7e-3≤(T1 / L1)≤7.7e-3.

[0055] In the related art, graphite heating tubes are subjected to various forces during the manufacturing and use processes. For example, the glass tube is subjected to atmospheric pressure during the vacuum process during the manufacturing process, or the two ends of the graphite heating tube are subjected to force during use. Under the condition of the same length, in order to meet the requirements of the above-mentioned various working conditions, the glass tube of the graphite heating tube is usually thicker, resulting in increased costs.

[0056] After extensive experimental analysis and research, the present application sets the ratio of T1 to L1 within the range of 5.7e-3 to 7.7e-3, comprehensively considering the effects of the total length of the tube body 10 and the wall thickness of the vacuum space on the strength of the heating tube 100. This improves the strength of the heating tube 100 while reducing the material used in the tube body 10 and lowering costs.

[0057] It should be noted that the total length of the tube body 10 also has a certain impact on the overall strength. For example, among multiple glass tubes of the same thickness, the longer glass tube itself is heavier, and the burden on both ends of the glass tube is greater. Therefore, the total length of the tube body 10 and the wall thickness of the vacuum space must be considered comprehensively.

[0058] It should be noted that 5.7e-3 is 0.0057, 7.7e-3 is 0.0077, and e is the scientific notation.

[0059] Specifically, T1 / L1 may be 5.7e-3; or, T1 / L1 may be 7.7e-3; or, T1 / L1 may be 6.7e-3; or, T1 / L1 may be 6.2e-3; or, T1 / L1 may be 7.2e-3.

[0060] According to the heat pipe 100 of the embodiment of the present invention, by setting the ratio between the total length of the tube body 10 and the wall thickness of the vacuum space within a range of 5.7e-3 to 7.7e-3, the influence of the total length of the tube body 10 and the wall thickness of the vacuum space on the strength of the heat pipe 100 is comprehensively considered. This improves the strength of the heat pipe 100 while reducing the material used for the tube body 10, thereby reducing costs.

[0061] In some specific embodiments, the tube body 10 is constructed as a quartz tube, which has two forms: a molten state and a solid state. When in the molten state, the quartz tube is deformed by pressure and is pressed into a fit with the end of the heating element 20. For example, the pressing block F2 presses the molten quartz tube onto the heating element 20. The molten quartz tube solidifies into a solid state after cooling, and the quartz tube maintains a fixed posture to maintain a press fit with the end of the heating element 20.

[0062] like Figure 2 、 Figure 4 As shown, in some embodiments, the minimum distance between the end of the tube pressure seal 13 away from the vacuum space and the tube body 12 is L2, and the thickness of the tube pressure seal 13 is T2, where 0.13≤(T2 / L2)≤0.33. After extensive experimental analysis and research, this application sets a limit on the size of the tube pressure seal 13 by setting 0.13≤(T2 / L2)≤0.33. This allows the heat pipe 100 to adapt to a wider range of forces during manufacturing and use, while also reducing the material used in the tube pressure seal 13 and lowering costs.

[0063] For example, during normal operation, the heat pipe 100 is mounted on a cooking device with its ends fixed, subjecting it to impact loads caused by a fall of the cooking device. Alternatively, the heat pipe 100 is fixed at both ends, subjecting it to torsional stress caused by thermal deformation. Both impact loads and torsional stresses place certain demands on the strength of the heat pipe 100. This application addresses these impact loads and torsional stresses by setting T2 / L2 between 0.13 and 0.33, thereby configuring the tube seal 13 accordingly. This improves strength while reducing material usage and lowering costs.

[0064] Among them, the limitation of T2 / L2 in this application makes the thickness of the tube pressure sealing portion 13 within a certain range, avoiding the problem of air leakage caused by too small edge sealing thickness in related technologies, so that the heating tube 100 can adapt to the atmospheric pressure generated by vacuuming during the manufacturing process.

[0065] For example, T2 / L2 may be 0.13; or, T2 / L2 may be 0.33; or, T2 / L2 may be 0.23; or, T2 / L2 may be 0.18; or, T2 / L2 may be 0.28.

[0066] like Figure 4 As shown, specifically, the cross-section of the tube pressing seal portion 13 is a rectangle, which facilitates the molding of the tube pressing seal portion 13 , wherein the thickness of the tube pressing seal portion 13 is equal to the width of the rectangle.

[0067] like Figure 2 、 Figure 5 、 Figure 6 As shown, in some embodiments, the tube main body 12 includes a middle portion 121 and a transition portion 122, and both ends of the middle portion 121 are respectively connected to the tube pressure sealing portion 13 through the transition portions 122. In the direction toward the packaging portion 232, the transition portion 122 extends obliquely or the transition portion 122 is formed into a curved surface, and the length L2 is the minimum distance from the end of the tube pressure sealing portion 13 away from the vacuum space to the transition portion 122.

[0068] In the direction toward the packaging portion 232 , the transition portion 122 extends obliquely or is formed into a curved surface to avoid stress concentration, thereby reducing the probability of the tube body 10 breaking.

[0069] In the prior art, graphite heating tubes have sharp corners where the sealing edge and the vacuum portion meet. These corners are weak points in the entire graphite heating tube 100, causing stress concentration there and making the graphite heating tube more susceptible to breakage. This invention alleviates this stress concentration issue by providing an inclined or curved transition portion 122, thereby reducing the probability of tube body 10 breaking and the probability of damage to the heating tube 100 during production, transportation, and use.

[0070] For example, the transition portion 122 extends obliquely, causing the tube body 10 to gradually shrink, avoiding sudden changes in diameter, thereby improving the problem of stress concentration. Alternatively, the transition portion 122 is formed as a curved surface, utilizing the curved surface characteristics to improve the problem of stress concentration.

[0071] In some embodiments, the transition portion 122 is connected to the curved surface of the middle portion 121 and the tube pressing portion 13. By providing the transition portion 122 with the curved surface of the middle portion 121 and the tube pressing portion 13, sharp corners are avoided at the connection position, further improving the problem of stress concentration.

[0072] In other embodiments, the transition portion 122 is connected to the middle portion 121 by a curved transition. By providing a curved transition connection between the transition portion 122 and the middle portion 121, sharp corners are avoided at the connection position, further improving the problem of stress concentration.

[0073] In some other embodiments, the transition portion 122 is connected to the tube pressure sealing portion 13 by a curved transition. By providing the transition portion 122 and the tube pressure sealing portion 13 with a curved transition, sharp corners are avoided at the connection position, further improving the problem of stress concentration.

[0074] like Figure 5 As shown, in some embodiments, the tube compression seal portion 13 has a first surface 131 disposed opposite to the tube compression seal portion 13 in the thickness direction thereof. The connection between the transition portion 122 and the tube compression seal portion 13 is formed as a first edge line 1311, and both ends of the first edge line 1311 intersect with the edge of the first surface 131. By setting the both ends of the first edge line 1311 to intersect with the edge of the first surface 131, the occurrence of sharp corners is reduced, thereby further improving the problem of stress concentration.

[0075] In the prior art, to smoothly seal the glass tube, a pressure edge is typically placed between the rectangular seal and the glass tube. This pressure edge is parallel to the centerline of the glass tube, concentrating stress on the pressure edge and increasing the probability of fracture of the graphite heating tube. This application further improves the stress concentration issue by arranging the ends of the first edge line 1311 to intersect the edges of the first surface 131, thereby reducing the presence of sharp corners.

[0076] like Figures 5 to 8As shown, in some embodiments, the first edge line 1311 is formed as a curve, and the transition portion 122 further includes a second edge line 1221 connecting to the tube body 12. The second edge line 1221 intersects the first edge line 1311 at an intersection. A tangent line at the intersection forms an angle θ1 with the centerline of the tube body 10, where 10°≤θ1≤40°. By setting the angle between the tangent line at the intersection and the centerline of the tube body 10 within a range of 10° to 40°, stress concentration is avoided, and the strength of the tube body 10 is improved.

[0077] Specifically, the tangent line of the intersection point and the first edge line 1311 are in the same virtual plane, which fully improves the stress situation.

[0078] For example, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 10°; or, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 15°, which increases the strength of the tube body 10 by 40%; or, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 20°; or, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 25°; or, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 30°; or, the angle θ1 between the tangent line at the intersection and the center line of the tube body 10 is 40°.

[0079] like Figure 9 As shown, in some embodiments, the heating element 20 is formed in a sheet shape. By setting the heating element 20 in a sheet shape, the sheet structure facilitates heat dissipation of the heating element 20, thereby improving the heating efficiency of the heat pipe 100.

[0080] like Figure 10 As shown, in some embodiments, the tube body 10 has at least one bending portion 11, the bending portion 11 is formed in an arc shape, and a reference line is defined that passes through the center of the bending portion 11 and is arranged perpendicular to the radius direction of the bending portion 11. In the thickness direction of the heating element 20, the heating element 20 has a neutral plane F1 located in the center, and the neutral plane F1 extends along the length direction of the tube body 10. At least the portion of the neutral plane F1 that is opposite to the bending portion 11 is arranged parallel to the reference line.

[0081] The reference line is a virtual line. This application defines the reference line as a virtual line that passes through the center of the bending portion 11 and is perpendicular to the radius direction of the bending portion 11 of the tube body 10 .

[0082] Specifically, the tube body 10 has at least one bending portion 11, and the bending portion 11 is formed into an arc shape, for example, Figure 13 As shown, the overall appearance of the tube body 10 is U-shaped, and the middle part 121 of the U-shaped tube is an arc-shaped bending part 11; or Figure 14As shown, the overall appearance of the tube body 10 is S-shaped, and multiple parts of the S-shaped tube are arc-shaped; or, as shown in FIG. Figure 11 As shown, the overall appearance of the tube body 10 is annular, and each part of the annular tube is arc-shaped.

[0083] The neutral plane F1 is a virtual plane. This application defines the neutral plane F1 as a virtual plane located at the center of the heating element 20 in the thickness direction and extending along the length direction of the tube body 10 .

[0084] In the related art, graphite heating tubes are made by vacuum-sealing graphite sheets into glass tubes. However, the graphite sheets are relatively thin, and are prone to twisting, cracking, and other problems when passing through the curved glass tube, resulting in a high defect rate.

[0085] The present application sets at least the portion of the neutral plane F1 that is opposite to the bending portion 11 to be parallel to the reference line, so that the heating element 20 will not be distorted by external forces, and the heating element 20 can smoothly penetrate into the tube body 10, thereby improving the yield rate, greatly improving production efficiency, and saving costs.

[0086] In some embodiments, the radius of curvature of the central axis of the bend 11 is R1, the radius of curvature of the portion of the neutral plane F1 directly opposite the bend 11 is R2, and 0.95≤(R2 / R1)≤1.05. Based on years of experience and extensive data analysis, the inventors have determined that setting 0.95≤(R2 / R1)≤1.05 further facilitates smooth insertion of the heater 20 into the hollow tube 10, preventing stretching, twisting, or bending of the inserted heater 20, thereby improving product yield.

[0087] Specifically, R1 is the curvature radius of the central axis of the bending portion 11. It should be noted that the central axis of the bending portion 11 is different from the bending portion 11. The bending portion 11 is formed in an arc shape. The bending portion 11 is a component with a certain volume. The part of the bending portion 11 close to the center of the circle and the part away from the center of the circle have different curvature radii. Here, the central axis is a virtual line, and the curvature radius of the central axis is different from the curvature radius of other parts on the bending portion 11.

[0088] Among them, the curvature radius of the part of the neutral plane F1 set opposite to the bending part 11 in this application has a certain correlation with the curvature radius of the central axis of the bending part 11, that is, the part of the neutral plane F1 located in the bending part 11 has a certain correlation with the central axis of the bending part 11, 0.95≤(R2 / R1)≤1.05, so that the heating element 20 is close to the central axis of the bending part 11 in the bending part 11, so that the heating element 20 will not be excessively bent, thereby reducing the probability of the heating element 20 being stretched, twisted and bent.

[0089] For example, R2 / R1 is 1, that is, the central axis of the bending portion 11 is located within the neutral plane F1 of the heating element 20, and the heating element 20 maintains a certain distance from the inner wall of the tube body 10, thereby reducing the probability of the heating element 20 being stretched, twisted, bent, and the like; or, R2 / R1 is 0.95; or, R2 / R1 is 0.97; or, R2 / R1 is 1.02; or, R2 / R1 is 1.05.

[0090] Specifically, when packaging a heat pipe, the heater element is first inserted into a quartz tube. The ends of the tube are then melted together, pressed into a block, and cooled to seal the heater and tube together. The heater element is a flat sheet, occupying a flat surface. When inserted into the tube, it can assume any position relative to the tube's swept neutral plane. Because the heater element is so thin, its positioning within the tube and the resulting packaging process parameters directly determine the heat pipe manufacturing yield.

[0091] The curved quartz tube is used as the outer protective cover of the heating tube. It is also designed into different shapes according to the spatial position of the product. The curved shapes include round, U-shaped and S-shaped. Figure 10 、 Figure 11 and Figure 12 As shown, the sweep centerline of the quartz tube is positioned in the XOY plane coordinate system, forming a functional relationship of the sweep centerline y1 = f(x). The calculation formula for the curvature radius is as follows:

[0092]

[0093] Where y· is d(y) / d(x), y·· is d 2 (y) / d(x 2 ), the function relationship of the swept center line of the quartz tube is substituted into the curvature radius calculation formula to obtain the curvature radius ρa of the swept center line of the quartz tube. The curved quartz tube is generally composed of several arc segments. It is assumed that the curvature radius of each segment is ρa1, ρa2 and ρa3, etc. Specifically, the curvature radius formula is common knowledge and will not be repeated here.

[0094] Before the heating element is introduced into the quartz tube for pressure sealing and melting, the positioning state of the heating element after it penetrates the quartz tube is analyzed, such as Figure 10 、 Figure 11 and Figure 12As shown, the centerline of the heater's sweep after positioning is also located in the XOY plane coordinate system, forming the functional relationship y2 = f(x) for the heater's sweep centerline. Substituting this functional relationship into the curvature radius calculation formula yields the radius of curvature ρb of the heater's sweep centerline, and the radii of curvature ρb1, ρb2, and ρb3 of the heater's sweep path after positioning in the curved quartz tube. Therefore, the ratio of the curvature radii of the heater and quartz tube in each segment is calculated as λ = ρb / ρa. The curvature radius ratio λ is R2 / R1.

[0095] The present application proposes that R2 / R1 is within the range of 0.95 to 1.05, and that the bending direction of the heating element 20 is consistent with the bending direction of the tube body 10, thereby forming the optimal process parameters for the positioning relationship between the heating element 20 and the tube body 10. Under the optimal parameters, the heating element 20 can smoothly penetrate into various curved tubes, especially annular tubes, U-shaped tubes and S-shaped tubes.

[0096] Specifically, the positioning of the annular tube can be carried out according to the optimal position relationship process parameters proposed in this application, and the following can be obtained smoothly: Figure 11 The annular tube shown. A partial enlarged view of the heater 20 after encapsulation into the tube body 10 shows that the offset angle between the heater 20 and the sweep plane is less than 5°, making it less likely for the heater 20 to come into contact with the inner wall of the tube body 10. Furthermore, the teeth of the heater 20 are evenly distributed, making it less susceptible to stretching, twisting, and bending. After cooling from the melt press, cracks in the heater 20 are rarely observed.

[0097] Specifically, the U-shaped tube is positioned according to the optimal position relationship process parameters proposed in this application to obtain the following Figure 13 The U-shaped tube shown in the figure has uniform tooth distribution on the heating element 20, and the offset angle of the heating element 20 is less than 5°. After forming, defects such as cracks, excessive stretching, twisting and bending are rarely found on the heating element 20.

[0098] Specifically, the S-shaped tube is positioned according to the process parameters of this application to obtain the following Figure 14 It can also be seen that the teeth of the heating element 20 are evenly distributed, without any local large stretching, twisting or bending, and no cracked graphite sheets were found after forming.

[0099] The solution of this application allows the heater 20 to be positioned in various curved tube configurations, establishing optimal positioning parameters. This allows the heater 20 to be easily inserted into the tube 10, and rarely results in heater 20 damaged by stretching, twisting, or bending. This ensures the integrity and reliability of the heater 20. The process of this application has increased the qualified rate of heater 20 packaging by over 23%, significantly improving the production efficiency of the heat pipe 100 and providing optimal process assurance for high-volume, high-qualification production of the heat pipe 100, saving considerable manufacturing costs.

[0100] In some embodiments, connecting terminals 23 are connected to both ends of the lengthwise direction of the heating element 20. Each connecting terminal 23 is press-sealed and fixed to the tube body 10, and a portion of the connecting terminal 23 extends out of the tube body 10. By providing the connecting terminals 23 to be press-sealed and fixed to the tube body 10, the heating element 20 is stabilized within the tube body 10.

[0101] Specifically, the compression sealing process is as follows: First, the heater 20 is gently inserted into the tube body 10, ensuring that the connecting terminals 23 protrude appropriately at both ends. Then, through methods such as flame heating, the ends of the tube body 10 are heated to a molten state. The compression blocks F2 on either side of the tube body 10 are then automatically and rapidly closed, squeezing the molten tube body 10. After the tube body 10 cools, the connecting terminals 23 and the tube body 10 are compressed and sealed together, ultimately forming a vacuum-enclosed space, completing the process of encapsulating the heater 20 into the tube body 10.

[0102] Specifically, the press-fitting between the tube sealing portion 13 and the end portion of the heating element 20 may be that the tube body 10 itself is pressed onto the connecting terminal 23 provided on the end portion of the heating element 20 .

[0103] In some embodiments, the connecting terminal 23 includes a terminal body 231 and a sealing portion 232. The terminal body 231 is connected to the heating element 20, and the sealing portion 232 is connected to the terminal body 231 and is press-sealed and fixed to the tube body 10. The terminal body 231 and the sealing portion 232 form an angle. By setting the angle between the terminal body 231 and the sealing portion 232, the probability of air leakage from the heating tube 100 is reduced during the press-sealing process between the connecting terminal 23 and the tube body 10, and the probability of cracks in the heating element 20 and the connecting terminal 23 is reduced.

[0104] In the related art, when a graphite sheet is packaged into a glass tube, the sheet is inserted into the glass tube relatively randomly. As the glass tube cools and solidifies, the graphite sheet is subjected to stress, which may cause the sheet to deform and twist, or the sheet may be squeezed against the inner wall of the glass tube. Various situations may cause cracks in the graphite sheet, resulting in a low pass rate. The present application provides an angle between the terminal body 231 and the packaging portion 232. This angle is pre-set between the terminal body 231 and the packaging portion 232 to improve the deformation of the heating element 20 during the cooling and solidification of the tube body 10, reduce the probability of cracks, and improve the packaging manufacturing pass rate.

[0105] In some embodiments, the angle θ2 between the terminal main body 231 and the packaging portion 232 is 180°. Figure 6 、 Figure 7 As shown, refer to Figure 15 As shown, the angle θ2 is 180°. When parallel packaging is performed, the heating element is parallel to the sealing plane. The heating element will not be stretched or twisted when inserted. When melt-sealed, the probability of the connecting terminals at both ends and the sealing plane forming an uneven molding state is reduced, the probability of cracks on the connecting terminals is reduced, and the probability of air leakage of the heating tube is reduced.

[0106] In some embodiments, the terminal body 231 and the encapsulation portion 232 are arranged perpendicularly. This arrangement allows the heater 20 to easily penetrate the tube body 10, preventing stretching, twisting, and bending that could damage the sheet-like heater 20, thereby ensuring the integrity of the encapsulated heater 20. Furthermore, during melt sealing, the connection terminal 23 and the tube sealing portion 13 can be kept parallel, significantly reducing the probability of cracks in the connection terminal 23 and the probability of air leakage in the heat pipe 100.

[0107] For example, the tube body 10 is a straight tube, and the state of the heating element 20 of the straight tube is as follows: Figure 18 、 Figure 19 As shown, refer to Figure 18 As shown, the angle θ2 is 90°. Before gently inserting the heating element 20, the connecting terminals at both ends are bent 90°. This ensures that the neutral plane of the inserted heating element 20 is perpendicular to the neutral plane of the tube compression seal 13 to be formed, and that the packaging portion 232 of the connecting terminal 23 is parallel to the tube compression seal 13 of the tube body 10. This vertical packaging of the straight tube reduces the likelihood of cracks in the connecting terminal 23 and the probability of air leakage in the heating tube 100, while also preventing stretching and twisting of the heating element 20.

[0108] Alternatively, the tube body 10 is any one of an annular tube, a U-shaped tube and an S-shaped tube, and the angle θ2 is 90°, so that the neutral plane F1 and the neutral plane of the tube pressure seal portion 13 are perpendicular. Figure 10 、 Figure 11 As shown, when the heating element 20 is inserted into the annular tube, this vertical state, referring to Figure 18 As shown, the angle θ2 is 90°, so that the heating element 20 can be easily inserted along the neutral plane of the annular tube, and the heating element 20 is not easily stretched or twisted; the connecting terminal 23 can also be well maintained parallel to the tube sealing portion 13 during the melting and sealing, reducing the probability of cracks on the connecting terminal 23 and the probability of gas leakage of the heating tube 100. Figure 13 As shown, similar to the annular tube, it can also ensure that the heating element 20 can easily pass through the semicircle, ensuring the manufacturing qualification rate during insertion and packaging. Figure 14 As shown, similar to the annular tube and the U-shaped tube, the heating element 20 is not easily stretched or twisted when passing through the upper bend 11 of the tube body 10, and leakage and cracking rarely occur when the connecting terminal 23 is melt-sealed.

[0109] Of course, refer to Figure 19 As shown, the angle θ2 can also be other values, which will not be described in detail here.

[0110] In some embodiments, the heating element 20 includes a plurality of heating units 22 arranged sequentially along the length. Each heating unit 22 is formed as a curved segment with an opening facing a first direction. Adjacent heating units 22 are connected by connecting pieces 24. Heating by the plurality of heating units 22 arranged sequentially along the length allows the heating element 20 to effectively dissipate heat, thereby improving the heating efficiency of the heat pipe 100. The first direction is a manually set direction and can be specifically upward, downward, leftward, or rightward.

[0111] Specifically, the heating unit 22 is formed as a curved section with an opening toward the first direction. The heating element 20 includes multiple heating units 22, and the heating units 22 are connected by connecting pieces 24. That is, the structure of the heating element 20 is: a circulation structure of heating unit 22 + connecting piece 24 + heating unit 22. Of course, it can also be a circulation structure of connecting piece 24 + heating unit 22 + connecting piece 24.

[0112] In some embodiments, the connecting piece 24 is connected to the middle of the curved section, that is, the curved section is partially suspended, thereby improving the heating efficiency.

[0113] In other embodiments, the connecting piece 24 is connected to the end of the curved section. By providing the connecting piece 24 connected to the end of the curved section, the probability of the heating element 20 contacting the inner wall of the tube body 10 is reduced.

[0114] The following combination Figures 1 to 19 , describing a specific embodiment of the heat pipe 100 of the present invention.

[0115] A heating pipe 100 includes a pipe body 10 , a heating element 20 and a connecting terminal 23 .

[0116] The tube body 10 is constructed as a quartz tube, and the tube body 10 includes: a tube main body 12 and a tube pressure sealing part 13. The tube main body 12 includes a middle part 121 and a transition part 122. The two ends of the middle part 121 are respectively connected to the tube pressure sealing part 13 through the transition parts 122. In the direction toward the packaging part 232, the transition part 122 is formed into a curved surface, and the transition part 122 is respectively connected to the middle part 121 and the tube pressure sealing part 13 by a curved surface.

[0117] In the thickness direction of the tube compression seal portion 13, the tube compression seal portion 13 has a first surface 131 disposed opposite to the tube compression seal portion 13. The connection between the transition portion 122 and the tube compression seal portion 13 forms a first edge line 1311. The first edge line 1311 is formed as a curve, and the two ends of the first edge line 1311 intersect with the edges of the first surface 131. The transition portion 122 also has a second edge line 1221 connected to the tube main body 12. The second edge line 1221 intersects the first edge line 1311 at an intersection.

[0118] The thickness of the tube seal 13 is T2, the minimum distance from the end of the tube seal 13 away from the vacuum space to the transition portion 122 is L2, and T2 / L2 is 0.23. The angle θ1 between the tangent line at the intersection and the centerline of the tube body 10 is 25°.

[0119] The tube body 10 further includes a curved portion 11, which is formed into an arc shape. A reference line is defined passing through the center of the curved portion 11 and perpendicular to the radius of the curved portion 11. In the thickness direction of the heating element 20, the heating element 20 has a neutral plane F1 located at the center. The neutral plane F1 extends along the length of the tube body 10, and at least the portion of the neutral plane F1 directly opposite the curved portion 11 is parallel to the reference line. The radius of curvature of the central axis of the curved portion 11 is R1, and the radius of curvature of the portion of the neutral plane F1 directly opposite the curved portion 11 is R2, where R2 / R1 is 1.

[0120] The heating element 20 is a sheet-shaped graphene material. Connecting terminals 23 are connected to both ends of the lengthwise direction of the heating element 20. Each connecting terminal 23 is press-sealed and fixed to the tube body 10, with a portion of the connecting terminal 23 extending beyond the tube body 10. The connecting terminals 23 comprise a terminal body 231 and a sealing portion 232. The terminal body 231 is connected to the heating element 20, while the sealing portion 232 is connected to the terminal body 231 and press-sealed and fixed to the tube body 10 to define a vacuum space. The terminal body 231 and sealing portion 232 are arranged perpendicularly. The total length of the tube body 10 is L1, and the wall thickness of the vacuum space is T1. The ratio T1 / L1 is 6.7e-3.

[0121] The heating element 20 includes a plurality of heating units 22 sequentially arranged along the length direction. Each heating unit 22 is formed as a curved section with an opening facing the first direction. Adjacent heating units 22 are connected by connecting pieces 24 .

[0122] The present invention conducts a series of optimizations on the thickness of the quartz tube and the thickness of the tube pressure seal portion 13 used in the manufacturing and actual use of the heating element 20 made of graphene material, and selects the optimal thickness range to ensure the strength of the quartz tube during the manufacturing and use processes, so that the overall strength of the heating tube 100 meets the working conditions requirements during manufacturing and actual use: the heating tube 100 can withstand the atmospheric pressure generated by vacuuming during the manufacturing process, can withstand the thermal shock load generated by rapid temperature increase during installation and use, can withstand the impact load generated by the product falling when installed on the product with both ends fixed, and the torsional stress caused by the deformation of the fixed ends due to heat, etc., so as to achieve the overall strength meeting the full working condition standards while reducing the overall material consumption of the quartz tube and reducing costs.

[0123] The cooking device according to the embodiment of the present invention includes the heating tube 100 described above.

[0124] According to the cooking device of the embodiment of the present invention, by setting the ratio between the total length of the tube body 10 and the wall thickness of the vacuum space within a range of 5.7e-3 to 7.7e-3, the influence of the total length of the tube body 10 and the wall thickness of the vacuum space on the strength of the heating tube 100 is comprehensively considered. This improves the strength of the heating tube 100 while reducing the material used for the tube body 10, thereby reducing costs.

[0125] In some embodiments, the cooking device includes: a box, a drawer, and a heating pipe 100 .

[0126] A drawer opening is provided on the front side of the box.

[0127] The drawer is used for holding food, and the drawer can be drawn relative to the box body through the drawer opening.

[0128] The heating pipe 100 is disposed in the box to heat the interior of the box.

[0129] Among them, the pull-out piece is used to hold food. Compared with the solution in the related art that the food carrying space is fixed in the cooking appliance, this application makes it convenient to place and take out food.

[0130] For example, the cooking device is an oven; or, the cooking device is an air fryer; or, the cooking device is a microwave oven.

[0131] Other structures and operations of the heat pipe 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0132] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0133] In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0134] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0135] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0136] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0137] While 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 invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A heating pipe, characterized in that: include: A tube body, comprising a tube main body and a tube pressure sealing portion, wherein both ends of the tube main body are provided with the tube pressure sealing portion; The heating element is a graphene material element, and the heating element is inserted into the tube body. The tube sealing portion and the end of the heating element are press-fitted together to define a vacuum space within the tube body. The total length of the tube body is L1, and the wall thickness of the vacuum space is T1, 5.7e-3≤(T1 / L1)≤7.7e-3.

2. The heating pipe according to claim 1, characterized in that The minimum distance between the end of the tube compression seal away from the vacuum space and the tube main body is L2, the thickness of the tube compression seal is T2, and 0.13≤(T2 / L2)≤0.

33.

3. The heating pipe according to claim 2, characterized in that: The tube main body includes a middle part and a transition part, and both ends of the middle part are respectively connected to the tube pressure sealing part through the transition parts. In the direction toward the tube pressure sealing part, the transition part extends obliquely or the transition part is formed into a curved surface. The length L2 is the minimum distance from the end of the tube pressure sealing part away from the vacuum space to the transition part.

4. The heating pipe according to claim 3, characterized in that The transition portion is transitionally connected to the middle portion and the pipe compression sealing portion curved surface respectively.

5. The heating pipe according to claim 3, characterized in that: In the thickness direction of the tube pressure sealing portion, the tube pressure sealing portion has a first surface arranged opposite to each other, and the connection between the transition portion and the tube pressure sealing portion forms a first edge line, and both ends of the first edge line respectively intersect with the edge of the first surface.

6. The heating pipe according to claim 5, characterized in that The first edge line is formed as a curve, and the transition part also has a second edge line connected to the main body of the tube. The second edge line intersects with the first edge line at an intersection. The tangent of the intersection has an angle θ1 with the center line of the tube body, 10°≤θ1≤40°.

7. The heating tube according to any one of claims 1 to 6, characterized in that: The heating element is formed in a sheet shape.

8. The heating pipe according to claim 7, characterized in that The tube body has at least one bending portion, which is formed in an arc shape. A reference line is defined that passes through the center of the bending portion and is arranged perpendicular to the radius of the bending portion. In the thickness direction of the heating element, the heating element has a neutral plane located in the center, and the neutral plane extends along the length direction of the tube body. At least the part of the neutral plane that is opposite to the bending portion is arranged parallel to the reference line.

9. The heating pipe according to claim 8, characterized in that The curvature radius of the central axis of the bending portion is R1, the curvature radius of the portion of the neutral plane directly opposite to the bending portion is R2, and 0.95≤(R2 / R1)≤1.

05.

10. The heating pipe according to claim 8, characterized in that Both ends of the heating element in the length direction are connected with connecting terminals. Each of the connecting terminals is sealed and fixed to the tube body, and a part of the connecting terminal extends out of the tube body.

11. The heating pipe according to claim 10, characterized in that The connecting terminal includes a terminal body and a packaging part. The terminal body is connected to the heating element. The packaging part is connected to the terminal body and is sealed and fixed to the tube body. The terminal body and the packaging part have an included angle.

12. The heat pipe according to claim 11, characterized in that The terminal main body and the packaging portion are vertically arranged.

13. The heating pipe according to any one of claims 1 to 6, characterized in that: The heating element includes a plurality of heating units sequentially arranged along a length direction, each of the heating units is formed as a curved section with an opening facing a first direction, and adjacent heating units are connected by a connecting piece.

14. A cooking device, characterized in that: The heat pipe comprises the heat pipe according to any one of claims 1 to 13.

15. The cooking device according to claim 14, characterized in that include: A box body, wherein a drawer opening is provided on the front side of the box body; a drawer for holding food, the drawer being drawable relative to the box body through the drawer opening; A heating pipe is provided in the box to heat the interior of the box.

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