CN212066515U - Reliable heating tube and cooking utensil - Google Patents

Abstract

The utility model relates to a reliable heating tube and cooking utensil, including confined container, the flaky heat-generating body of suspension in the container, wear out the power supply portion at container both ends, power supply portion is connected at the both ends of heat-generating body, is equipped with first support piece in the power supply portion, be equipped with the second support piece that is used for supporting the heat-generating body in the container, second support piece is located between the both ends of heat-generating body. In the long-term use of heat-generating body, the utility model provides a technical scheme can avoid the heat-generating body because of softening and the flagging phenomenon that produces under its self action of gravity, improves the reliability of heating tube.

Description

Reliable heating tube and cooking utensil

Technical Field

The utility model relates to a kitchen utensil field particularly, relates to a reliable heating tube and cooking utensil.

Background

Patent CN101861758A discloses a heat generating tube, which is composed of a heat-resistant glass tube, a heat generating body and a power supply part, wherein the heat generating body is a thin film sheet made of a material containing a carbon-based substance, has two-dimensional isotropic heat conductivity in the plane direction, and can rapidly heat up and efficiently generate heat overall when energized. Therefore, the heating tube is gradually applied to the cooking utensil to replace the existing heating tube with slow heating temperature rise, and further the cooking efficiency of the cooking utensil is improved.

As shown in fig. 1, the heating element is thermally expanded when being electrified, which causes a problem of softening of the heating element during long-term use of the heating element, and the heating element is a thin and long strip-shaped film, and is easily softened and sagged under the action of its own gravity, even contacts with the inner wall of the container, which affects the thermal performance of the heating tube and reduces the reliability of the heating tube.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a reliable heating tube and cooking utensil.

The utility model discloses a following technical scheme realizes:

the utility model provides a reliable heating tube, includes confined container, the flaky heat-generating body of suspension in the container, wears out the power supply portion at container both ends, and power supply portion is connected at the both ends of heat-generating body, is equipped with first support piece in the power supply portion, be equipped with the second support piece that is used for supporting the heat-generating body in the container, second support piece is located between the both ends of heat-generating body.

Further, the heating body includes a conductive portion, and the second support member is located on the conductive portion.

Further, the heat generating body includes at least two heat generating portions, and the heat generating portions are electrically connected to each other through the conductive portion.

Further, the container is provided with an arc-shaped portion, and the second support member is located at the arc-shaped portion.

Further, the length ratio of the conductive part to the heat generating part is 0.3-0.55.

Further, the heating part comprises wide parts and narrow sub-parts, the wide parts and the narrow sub-parts are alternately arranged in the length direction of the heating part, a slit is arranged in the middle of the wide parts, and the minimum distance between the end part of the slit and the end part of the wide part is larger than the minimum distance between the side part of the slit and the side part of the wide part.

Further, the container is filled with an inert gas.

Furthermore, the outer wall of the container is provided with a salient point for marking the installation direction.

Furthermore, the salient point is arranged in the middle of the outer wall of the container.

In addition, a cooking appliance is also provided, which comprises the reliable heating tube.

Compared with the prior art, the beneficial effects of adopting the technical scheme are that:

1. the container is internally provided with a second support piece for supporting the heating body, the second support piece is positioned between two ends of the heating body, so that the phenomenon that the heating body sags due to softening and under the action of gravity of the heating body can be avoided in the long-term use process of the heating body, and the reliability of the heating tube is improved.

2. The heating body comprises a conductive part, and the second support piece is positioned on the conductive part, so that the heating part of the heating body is arranged in a segmented manner, the heating part is prevented from being overlong, the phenomenon that the heating part is softened and sags under the action of the gravity of the heating part can be further avoided in the long-term use process of the heating body, and the reliability of the heating tube is improved; in addition, the conductive part is arranged on the heating body, so that the temperature field in the cooking cavity is further optimized, the temperature in the cooking cavity can be better controlled, the temperature in the cooking cavity tends to be uniform, the local heat concentration of the cooking cavity in the cooking process is avoided, and the cooking effect and the user experience are improved; in addition, the strength of the heating body is increased, and the damage rate of the heating body in the assembling process is reduced.

4. The container is equipped with arc portion, second support piece is located arc portion, makes the heating tube can match more with the inner structure in culinary art chamber, improves cooking utensil's culinary art effect and culinary art efficiency.

5. The heating part comprises a wide part and a narrow part, the wide part and the narrow part are alternately arranged in the length direction of the heating part, a slit is arranged in the middle of the wide part, the minimum distance between the end part of the slit and the end part of the wide part is larger than the minimum distance between the side part of the slit and the side part of the wide part, the resistance between the end part of the slit and the end part of the wide part is reduced, the resistance between the side part of the slit and the side part of the wide part is increased according to the calculation formula of the resistance, the heat radiation quantity of a container area close to the heating part is reduced, the heat radiation quantity of a region far away from the heating part is increased, the heat radiation quantity of the container corresponding to the heating part in the circumferential direction tends to be consistent, the temperature field in the cooking cavity is further optimized, and the temperature in the cooking cavity is uniform, thereby make food be heated evenly, promote cooking utensil's culinary art effect and promote user's use and experience.

6. And inert gas is filled in the container to prevent the heating element from being oxidized.

7. The outer wall of the container is provided with the salient points for marking the installation direction, so that the heating tube is convenient to install in the cooking cavity, and the assembly accuracy and the assembly efficiency are improved.

8. The salient point is arranged in the middle of the outer wall of the container, so that the salient point can be directly formed at the part for vacuumizing and filling the inert gas in the heating tube manufacturing process, the processing of the container can be reduced, and the manufacturing efficiency of the heating tube is improved.

Drawings

The invention is described in further detail below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of a conventional heat generating tube;

FIG. 2 is a schematic structural diagram of a heating tube according to the first embodiment;

FIG. 3 is a schematic view showing a structure of a heat-generating body according to the first embodiment;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic view of a partial structure of a heating tube according to a second embodiment;

FIG. 6 is a schematic view of a partial structure of a heating tube according to a third embodiment;

FIG. 7 is a schematic structural view of a cooking appliance according to a fourth embodiment;

FIG. 8 is a sectional view of a cooking chamber of the fourth embodiment;

the corresponding reference numbers for the component names in the figures are as follows:

100. a cooking appliance; 10. a heat generating tube; 11. a heating element; 111. a side surface portion; 112. a planar portion; 113. a heat generating portion; 114. A conductive portion; 115. a wide part; 116. a narrow secondary portion; 117. cutting a seam; 12. a power supply unit; 121. a holder; 122. a first support member; 123. an inner lead; 124. a molybdenum foil; 125. an external lead; 126. a second support member; 13. a container; 131. An arc-shaped portion; 132. a straight tube portion; 14. salient points; 20. a cooking cavity; 21. a food material placement area; 22. an upper wall; 23. a transition section; 24. a rear wall; 25 lower wall; 30. a display control panel; 40. the oven door.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example one

As shown in FIGS. 2 and 3, the present invention provides a reliable heating tube 10, which comprises a closed container 13, a sheet-shaped heating element 11 suspended in the container 13, and power supply parts 12 extending out of both ends of the container, wherein both ends of the heating element 11 are connected to the power supply parts 12, the heat generating body 11 includes a heat generating part 113 and a conductive part 114, the conductive part 114 is a molybdenum rod, the molybdenum rod is electrically and fixedly connected with the end of the heat generating part 113 through the holding member 121, a second supporting member 126 is provided on the conductive part 114, by disposing the molybdenum rod in the middle of the heating body 11, and disposing the second supporter 126 on the molybdenum rod, thus, the heating part 113 of the heating element 11 is provided in a segmented manner, and the heating part 113 is prevented from being excessively long, in the process of long-term use of the heating element 11, the phenomenon that the heating element 113 is softened and sags under the action of the gravity of the heating element itself can be avoided, and the reliability of the heating tube 10 is improved; in addition, through be equipped with conducting part 114 on heat-generating body 11, further optimize the temperature field in the culinary art chamber 20 to the temperature in control culinary art chamber 20 that can be better avoids culinary art in-process culinary art chamber 20's local heat to concentrate, so realize that the temperature in the culinary art chamber 20 tends to evenly, has promoted culinary art effect and user experience and feels.

In addition, the second support 126 is provided on the molybdenum rod, so that the heat generating part 113 can be further stably absorbed and diffused by stress under thermal stress, and the position of the heat generating part 113 in the container 13 is prevented from being changed, thereby improving the reliability of the heat generating tube 10.

In this embodiment, the second support 126 is a coil support.

In addition, since the heating element 11 is a thin and long sheet-like film, when it is placed in the container 13, a certain pulling force needs to be applied to both ends of the heating element 11 to straighten the heating element in the container 13, and if the pulling force is too small, the surface of the heating element 11 is uneven, and a phenomenon of arching occurs in a partial region of the heating element 11, which affects the reliability of the heating tube 10; if the tension is too large, the heating element 11 is easily broken, and the yield is lowered. The molybdenum rod is provided on the heating element 11, so that the strength of the heating element 11 can be improved, the assembly rate of the heating element 11 and the container 13 can be improved, and the yield of the heating tube 10 can be improved.

In the present embodiment, as shown in fig. 3 and 4, the heat generating portion 113 includes wide portions 115 and narrow sub-portions 116, the wide portions 115 and the narrow sub-portions 116 are alternately arranged in the longitudinal direction of the heat generating portion 113, a slit 117 is provided at a middle position of the wide portion 115, a minimum distance L1 between an end of the slit 117 and an end of the wide portion 115 is greater than a minimum distance L2 between a side of the slit 117 and a side of the wide portion 115, 1.05L2 is equal to or less than L1 is equal to or less than 1.5L2, as can be seen from a calculation formula of resistance, such that resistance between the end of the slit 117 and the end of the wide portion 115 is reduced, resistance between the side of the slit 117 and the side of the wide portion 115 is increased, heat radiation amount in a region of the container 13 closer to the heat generating portion 113 is reduced and heat radiation amount in a region of the container 13 farther from the heat generating portion 113 is increased because resistance of the heat generating body 11 is proportional to temperature, make the thermal radiation volume of the container 13 that generates heat 113 corresponds on the circumferencial direction and tend to unanimity, further optimize the temperature field in the culinary art chamber 20, make the temperature in the culinary art chamber 20 even to it is even to make food be heated, promotes cooking utensil's culinary art effect and promotion user's use experience.

It is to be understood that the wide width portion 115 and the narrow width portion 116 are formed by laser cutting the heat-generating body 11. Specifically, the heating element 11 is processed by pulse laser to obtain a desired shape, wherein, for the cutting seam with the cutting seam width of more than 80 μm, the wavelength of 1064nm is selected for processing, and as the laser under the wavelength belongs to thermal processing, the melting, ablation and evaporation are generated on the surface of the material, so that the complete ablation at the cutting seam is realized, and the processing quality of the heating element is improved; selecting short wavelength laser with wavelength of 532nm or 355nm for cutting slit with width below 80 μm; wherein, the heating element is cut and processed by adopting the pulse frequency of 20kHz, the pulse width of 70ns, the power of 30W and the cutting speed of 100mm/s, so that the heating element 11 is ensured to be cut and formed at one time, repeated cutting is avoided, and the processing efficiency and the precision are improved.

In this embodiment, the inner diameter of the container is D, the width of the heating portion is L, D is not less than 1.3L and not more than 1.8L, and the ratio of the inner diameter of the container 13 to the width of the heating portion 113 is set, so that the heat radiation amount of the container 13 corresponding to the heating portion 113 in the circumferential direction tends to be consistent, the temperature field in the cooking cavity 20 is further optimized, the temperature in the cooking cavity 20 tends to be uniform, thereby heating food uniformly, improving the cooking effect of the cooking appliance and improving the use experience of a user.

In the present embodiment, the length ratio of the conductive portion 114 to the heat generating portion 113 is 0.3 to 0.55, and preferably, the length ratio of the conductive portion 114 to the heat generating portion 113 is 0.33 to 0.45.

In the present embodiment, the protruding points 14 for marking the installation direction are provided on the outer wall of the container 13, so that the heating tube 10 can be conveniently installed in the cooking cavity 20, and the accuracy and efficiency of the assembly can be improved. In addition, the baking performance of the same cooking appliance 100 can be ensured to be consistent, and the experience of the user is improved.

Preferably, the protruding point 14 is arranged in the middle of the outer wall of the container 13, so that the protruding point can be directly formed at a part which is vacuumized and filled with inert gas in the heating tube manufacturing process, thereby reducing the processing of the container, improving the manufacturing efficiency of the heating tube and reducing the cost.

Preferably, the bumps 14 are provided on the outer wall of the container 13 corresponding to the conductive portions 114, so as to reduce the influence of the bumps 14 on the heat radiation of the heat generating tube 10.

In the embodiment, the height of the bump 14 is 1-5mm, which is convenient for the heating tube 10 to identify the bump 14 in the assembling process, and prevents the bump 14 from being too high and causing damage in the processes of carrying, mounting and the like, which results in the rejection of the heating tube 10.

It will be appreciated that the bumps 14 are provided during the formation of the container; the salient points 14 may also be provided during the manufacturing process of the heating tube, specifically, the middle part of the container 13 is provided with an air duct communicated with the inside of the container 13, after the heating body 11, the power supply part 12 and the container 13 are assembled, two ends of the container 13 are melted and sealed, the container 13 is vacuumized and filled with inert gas through the air duct, and then the air duct is fused and sealed to the container 13, so that the salient points 14 are formed on the outer wall of the container 13.

In the present embodiment, the heating element 11 is in the form of a thin film sheet mainly composed of a carbon-based substance and having two-dimensional isotropic thermal conductivity in the plane direction, and has flexibility, flexibility and elasticity, and the heat conductivity of the heating element is 200W/(m · K) and the thickness is 300 μm or less, and it is understood that the thickness of the heating element may be 100 μm, 150 μm, 200 μm, 250 μm, or the like; the heating body 11 is a graphite sheet which has processing designability so as to realize the temperature range adjustment on the heating tube; preferably, the heating element 11 is a graphite sheet.

The graphite flake is obtained by performing high-temperature heat treatment on a polymer film or a polymer film added with 0.2-20 wt% of a filler, and the preparation method of the graphite flake adopts a conventional preparation method of the graphite flake in the field.

In the present embodiment, the power supply unit 12 includes a holder 121 attached to both ends of the heating element, a first supporter 122, an inner lead 123, a molybdenum foil 124, and an outer lead 125, the holder 121 fixes the inner lead 123, the inner lead 123 is electrically connected to the outer lead 125 led out from both ends of the container 13 to the outside of the container through the molybdenum foil 124 embedded in the sealed portions at both ends of the container 13, the first supporter 122 is provided on the inner lead 123, and the first supporter 122 is a coil support.

It is understood that the material of the holder 121, the first support 122, the second support 126, the inner lead 123 and the outer lead 125 is molybdenum metal.

In the present embodiment, both ends of the container 13 are melted into a flat plate shape, and an inert gas, which is a mixed gas of argon, nitrogen, argon and xenon, or argon and krypton, is filled inside the container to prevent oxidation of the heating element; the container 13 is made of a heat-resistant material, such as quartz glass, soda-lime glass, boric acid glass, lead glass and other glass materials; preferably, the container 13 is a quartz glass tube.

It can also be understood that the heat-generating body 11 has an elongated sheet-like structure, and the second support member 126 is provided in the container 13 for supporting the elongated sheet-like heat-generating body 11, so that the heat-generating body 11 can be prevented from being softened and sagging under its own weight during long-term use of the heat-generating body 11, and the reliability of the heat-generating tube 10 can be improved.

Example two

As shown in fig. 5, the second embodiment of the present invention is different from the first embodiment in that, in the second embodiment, the container 13 is a semi-arc or arc-shaped structure, the container 13 is provided with an arc portion 131, and the second supporting member 126 is located at the arc portion 131, so that the heat generating tube 10 can be more matched with the internal structure of the cooking cavity 20, and the cooking effect and the cooking efficiency of the cooking appliance are improved.

In this embodiment, the molybdenum rod has a certain flexibility to satisfy the assembly between the heating body 11 and the container 13.

Other structures and effects of the parts not described are the same as those of the first embodiment, and are not described in detail here.

EXAMPLE III

As shown in fig. 6, the third embodiment of the present invention is different from the second embodiment in that, in the third embodiment, the container 13 includes an arc portion 131 and straight pipe portions 132, and the arc portion 131 is disposed between adjacent straight pipe portions 132.

Other structures and effects of the parts not described are the same as those of the embodiment, and are not described in detail here.

Example four

As shown in fig. 7, the present invention further provides a cooking apparatus 100, which employs the reliable heating tube 10 to improve the reliability of the cooking apparatus 100.

In the present embodiment, the heating tube 10 is installed on the upper portion of the cooking cavity 20, so that the infrared rays emitted from the heating tube 10 can effectively penetrate into the food, and the shielding of other components in the cooking cavity 20 from the infrared rays is reduced, thereby improving the cooking efficiency.

In the present embodiment, the cooking cavity 20 has a square structure, which is common in the field of oven technology; it can also be understood that a transition portion 23 is respectively disposed between the upper wall 22 and the rear wall 24 of the cooking cavity 20 and between the rear wall 24 and the lower wall 25, so as to increase the volume of the cooking cavity 20 and avoid the excessive temperature inside the cooking cavity 20 from burning the food, as shown in fig. 8.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims (10)

1. The utility model provides a reliable heating tube, includes confined container, the flaky heat-generating body of suspension in the container, wears out the power supply portion at container both ends, and power supply portion is connected at the both ends of heat-generating body, is equipped with first support piece in the power supply portion, its characterized in that, be equipped with the second support piece that is used for supporting the heat-generating body in the container, second support piece is located between the both ends of heat-generating body.

2. A reliable heat generating tube according to claim 1, wherein said heat generating body includes a conductive portion, and said second support member is located on the conductive portion.

3. A reliable heat generating tube as set forth in claim 2, wherein said heat generating body comprises at least two heat generating portions electrically connected to each other through an electrically conductive portion.

4. A reliable heat generating tube according to claim 3, wherein the container is provided with an arc-shaped portion, and the second support member is located at the arc-shaped portion.

5. A reliable heat generating tube according to claim 3, wherein the ratio of the length of the conductive portion to the length of the heat generating portion is 0.3 to 0.55.

6. The reliable heat generating tube as claimed in any one of claims 3 to 5, wherein the heat generating part comprises wide width parts and narrow width sub-parts, the wide width parts and the narrow width sub-parts are alternately arranged in a length direction of the heat generating part, the wide width parts are provided with slits at intermediate positions thereof, and a minimum distance between ends of the slits and ends of the wide width parts is greater than a minimum distance between sides of the slits and sides of the wide width parts.

7. A reliable heat-generating tube according to any one of claims 1 to 5, wherein the container is filled with an inert gas.

8. A reliable heat-generating tube as described in any one of claims 1-5, wherein the outer wall of said container is provided with a protruding point for marking the mounting direction.

9. The reliable heat pipe of claim 8, wherein the protrusion is formed at a middle portion of the outer wall of the container.

10. A cooking appliance comprising the reliable heat-generating tube of any one of claims 1 to 9.

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