A heating tube sealing structure and a baking tray

Abstract

The utility model discloses a heating tube sealing structure and baking tray, aim at solving the existing heating tube seal not thoroughly, the assembly stability is poor and so on. The structure contains heating disc, its inside is equipped with magnesium oxide filler, and the first, second heating tube cold needle is projected with respectively two ends, and there is the heating wire that penetrates heating disc and is wrapped by magnesium oxide filler between two cold needles. In addition, still be equipped with first conducting rod subassembly and second conducting rod subassembly, two respectively with the both ends sealed connection of heating disc. This design through both ends conducting rod subassembly and the close seal of heating disc, can bear the gas expansion pressure in pipe, prevent gas leakage, maintain the pressure balance in pipe, enhance the sealing reliability, effectively solve the sealing problem caused by gas expansion. Meanwhile, the structure reduces the dependence on the size precision of single component, even if the size error exists in component processing, can realize good sealing connection, reduces the unstable situation of assembly caused by size deviation, improves the stability and success rate of assembly.

Description

Technical Field

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

[0002] In the field of electric heating appliances, heating elements, as core heating components, are widely used in various electrical products, such as baking pans, water heaters, and ovens. The performance of the heating element directly determines the heating efficiency, safety, and lifespan of the electric heating appliance. A heating element typically consists of a heating plate, a heating wire, and magnesium oxide filler. The heating plate provides support and a mounting base for the heating wire. The heating wire generates heat when energized, while the magnesium oxide filler acts as insulation and thermal conductivity, efficiently transferring the heat generated by the heating wire while preventing electrical short circuits between the heating wire and the external environment.

[0003] Existing heating element sealing structures have numerous potential sealing vulnerabilities when dealing with complex operating environments. In high-temperature and high-humidity environments, moisture can easily penetrate the heating element. Because magnesium oxide filler is highly hygroscopic, once moisture enters, it rapidly absorbs the moisture and undergoes a hydrolysis reaction, leading to a significant decrease in its insulation performance. This not only makes the electrical performance of the heating element unstable and increases the risk of leakage, but may also cause short-circuit faults, seriously threatening user safety. Utility Model Content

[0004] The purpose of this utility model is to disclose a heating tube sealing structure that can effectively solve the core problems of incomplete sealing and poor assembly stability in the prior art.

[0005] To achieve the above objectives, this utility model discloses a heating tube sealing structure, comprising: a heating plate, wherein a magnesium oxide filler is disposed inside the heating plate, a first heating tube cold needle protruding from one end of the heating plate, a second heating tube cold needle protruding from the other end of the heating plate, and a heating wire penetrating the heating plate is disposed between the first heating tube cold needle and the second heating tube cold needle, the magnesium oxide filler being wrapped around the surface of the heating wire; a first conductive rod assembly, the first conductive rod assembly being sealed to one end of the heating plate; and a second conductive rod assembly, the second conductive rod assembly being sealed to the other end of the heating plate.

[0006] By adopting the above solution, the conductive rod assemblies at both ends are tightly sealed to the heating plate, which can withstand the pressure generated by the expansion of gas inside the tube to a certain extent, prevent gas leakage, maintain pressure balance inside the tube, ensure the normal operation of the heating tube, further enhance the reliability of the seal, and solve the sealing problem caused by gas expansion. This also means that the sealing connection between the first and second conductive rod assemblies and the heating plate ends no longer relies excessively on the dimensional accuracy of individual components. Even if there are certain dimensional errors in the components during processing, a good sealing connection can be achieved through a reasonable sealing structure, reducing assembly instability caused by dimensional deviations and improving assembly stability and success rate.

[0007] Furthermore, one end of the heating plate is provided with a first hollow section, and the other end of the heating plate is provided with a second hollow section, and the first hollow section and the first hollow section are filled with a first high-temperature silicone.

[0008] By adopting the above solution, a dense sealing barrier can be formed, effectively preventing external substances such as moisture, dust, and corrosive gases from entering the heating element. This prevents the magnesium oxide filler from hydrolyzing due to moisture absorption, avoiding a decline in its insulation performance, reducing the risk of leakage and short circuits in the heating element, and ensuring its safe and stable operation. The conductive rod assemblies at both ends are tightly sealed to the heating plate, which can withstand the pressure generated by the expansion of gas inside the tube to a certain extent, preventing gas leakage, maintaining pressure balance inside the tube, ensuring the normal operation of the heating element, further enhancing the reliability of the seal, and solving the sealing problem caused by gas expansion.

[0009] Furthermore, the lengths of the first hollowed-out section and the second hollowed-out section are 4mm-5mm.

[0010] By adopting the above solution, the length of the hollowed-out section of 4mm-5mm can be relatively easily and precisely controlled during the machining process, which can ensure the dimensional consistency of the hollowed-out section, reduce machining errors, and improve production efficiency and product quality.

[0011] Furthermore, both the first conductive rod assembly and the second conductive rod assembly include: a silicone sleeve, wherein the silicone sleeve of the first conductive rod assembly is fitted onto one end of the heating plate, and the silicone sleeve of the second conductive rod assembly is fitted onto the other end of the heating plate; and a conductive rod, wherein the conductive rod of the first conductive rod assembly is threadedly connected to the cold needle of the first heating tube, and the conductive rod of the second conductive rod assembly is threadedly connected to the cold needle of the second heating tube.

[0012] By adopting the above solution, the hydrolysis of magnesium oxide filler due to moisture absorption can be prevented, avoiding a decline in insulation performance, reducing the risk of leakage and short circuits in the heating element, and ensuring the safe and stable operation of the heating element in various harsh environments. This double-sealing protection further enhances the overall sealing performance of the heating element, improving product reliability and service life.

[0013] Furthermore, the silicone sleeve has a perforation in the center for the first heating tube cold needle or the second heating tube cold needle to pass through.

[0014] By adopting the above solution, the perforated design allows the silicone sleeve to be precisely fitted onto the heating element's cold needle, achieving a tight fit. Combined with the sealing connection between the silicone sleeve and the end of the heating plate, the perforation and the heating element's cold needle work together to form a multi-layered sealing structure. During assembly, the perforation provides clear positioning for the heating element's cold needle, allowing operators to quickly and accurately fit the silicone sleeve onto the cold needle before installing the entire conductive rod assembly onto the heating plate. This significantly improves assembly efficiency, reduces assembly time and labor costs, and is particularly suitable for large-scale production.

[0015] Furthermore, the conductive rod and the heating plate are riveted together.

[0016] By adopting the above solution, the silicone sleeve, conductive rod, and heating plate are tightly joined together through the deformation of the rivets, enabling them to withstand greater tensile, compressive, and shear forces. Even under frequent vibrations, stresses caused by thermal expansion and contraction, and impacts from external forces, the connections between the components remain firm, preventing loosening or detachment, thus improving the overall structural strength and reliability of the heating element.

[0017] Furthermore, the first high-temperature silicone is a high-temperature red sealing silicone.

[0018] By adopting the above solution, the high-temperature red sealing silicone has excellent elasticity and flexibility, which can closely adhere to the surface of components such as heating plates and conductive rods, fill any possible tiny gaps and unevenness, and form an effective sealing barrier.

[0019] Furthermore, a second high-temperature silicone sealant is provided between the silicone sleeve and the conductive rod.

[0020] By adopting the above solution, external moisture, dust, impurities, etc. can be prevented from entering the heating element, preventing the magnesium oxide filler from absorbing moisture and hydrolyzing, avoiding faults such as leakage and short circuit caused by decreased insulation performance, and ensuring the safe and stable operation of the heating element in various harsh environments.

[0021] Furthermore, the second high-temperature silicone is a high-temperature red sealing silicone.

[0022] By adopting the above solution, high-temperature red sealing silicone exhibits excellent aging resistance, maintaining its elasticity and sealing performance over long-term use. It is not prone to hardening, cracking, or shrinkage due to factors such as time, temperature changes, or ultraviolet radiation, thus ensuring the durability of the sealing effect and reducing maintenance and replacement costs caused by seal failure.

[0023] A baking pan includes a baking pan body and a heating element sealing structure integrally formed by die casting with the baking pan body.

[0024] By adopting the above solution, intermediate heat transfer steps and thermal resistance are reduced, allowing the heat generated by the heating element to be transferred to the baking pan surface more quickly and evenly. This not only improves the heating speed of the baking pan and shortens cooking time, but also ensures that food is heated more evenly, resulting in better cooking outcomes. During the cooking process, neither the grease produced when grilling meat nor the water used to clean the baking pan can seep into the pan and come into contact with the heating element, effectively preventing short circuits, damage, and other malfunctions caused by liquid leakage, thus extending the lifespan of the heating element.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] 1. During the operation of the heating element, the internal magnesium oxide filler and heating wire will cause the gas inside the tube to expand when heated. This sealing structure is tightly sealed to the heating plate through the conductive rod assemblies at both ends, which can withstand the pressure generated by the expansion of the gas inside the tube, prevent gas leakage, maintain the pressure balance inside the tube, ensure the normal operation of the heating element, and avoid damage to internal components or performance degradation due to gas leakage;

[0027] 2. In existing heating element sealing structures, moisture easily penetrates the heating element under high temperature and humidity conditions, causing the magnesium oxide filler to absorb moisture and hydrolyze, resulting in a significant decrease in insulation performance and increasing the risk of leakage and short circuits. The sealing structure of this invention effectively prevents external moisture from entering, protecting the magnesium oxide filler from moisture, ensuring stable electrical performance of the heating element, and guaranteeing user safety. Even when submerged in water, it still maintains the insulation effect between the heating element and water.

[0028] 3. A well-sealed structure prevents external impurities and moisture from entering the heating element, avoiding contamination and moisture absorption of the magnesium oxide filler, thus ensuring its insulation performance. Stable insulation effectively prevents electrical short circuits between the heating wire and the outside environment, reducing the risk of leakage and providing users with a safer and more reliable electrical environment.

[0029] 4. It can effectively block harmful substances from the external environment, such as moisture, dust, and chemicals, from entering the heating element, preventing these substances from corroding and damaging internal components such as the heating wire and magnesium oxide filler. This extends the service life of the internal components and ensures the long-term stable operation of the heating element. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in 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.

[0031] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present invention;

[0032] Figure 2 This is a partial exploded structural diagram of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the baking pan according to Embodiment 1 of this utility model.

[0034] Key reference numerals in the attached drawings: 1. Heating plate; 11. Magnesium oxide filler; 12. First heating tube cold needle; 13. Second heating tube cold needle; 14. Heating wire; 15. First hollowed-out section; 16. Second hollowed-out section; 17. First high-temperature silicone; 2. First conductive rod assembly; 3. Second conductive rod assembly; 31. Silicone sleeve; 32. Conductive rod; 4. Perforation; 5. Second high-temperature silicone; 6. Baking plate body. Detailed Implementation

[0035] 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.

[0036] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0040] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0041] Please refer to Embodiment 1 of this utility model. Figures 1 to 3As shown, a heating element sealing structure is provided, including a heating plate 1 and a conductive rod assembly. Specifically, the heating plate 1 is filled with magnesium oxide filler 11, and a first heating element cold needle 12 and a second heating element cold needle 13 extend from both ends, respectively. The heating plate 1 is, but is not limited to, a straight line, a U-shape, an S-shape, or a ring shape. A heating wire 14 is disposed inside the heating plate 1, which passes through the heating plate 1 and connects to the two cold needles. The magnesium oxide filler 11 tightly wraps the heating wire 14. Preferably, the heating plate 1 has hollowed-out sections at both ends, namely a first hollowed-out section 15 and a second hollowed-out section 16, which can form a dense sealing barrier to effectively prevent external substances such as moisture, dust, and corrosive gases from entering the interior of the heating element. This can prevent the magnesium oxide filler 11 from hydrolyzing due to moisture absorption, avoid its insulation performance degradation, reduce the risk of leakage and short circuit in the heating element, and ensure the safe and stable operation of the heating element. The conductive rod assembly at both ends is tightly sealed to the heating plate 1, which can withstand the pressure generated by the expansion of gas inside the tube to a certain extent, prevent gas leakage, maintain the pressure balance inside the tube, ensure the normal operation of the heating tube, further enhance the reliability of the seal, and solve the sealing problem caused by gas expansion. The first hollow section 15 and the second hollow section 16 are filled with a first high-temperature silicone 17. The first high-temperature silicone 17 is preferably a high-temperature red sealing silicone, which can withstand temperatures above 300°C. The first hollow section 15 and the second hollow section 16 are symmetrically designed and filled with silicone of the same specification. The conductive rod assembly includes a first conductive rod assembly 2 and a second conductive rod assembly 3. The first conductive rod assembly 2 is sealed to one end of the heating plate 1, and the second conductive rod assembly 3 is sealed to the other end of the heating plate 1. The conductive rod assembly at both ends is tightly sealed to the heating plate 1, which can withstand the pressure generated by the expansion of gas inside the tube to a certain extent, prevent gas leakage, maintain the pressure balance inside the tube, ensure the normal operation of the heating tube, further enhance the reliability of the seal, and solve the sealing problem caused by gas expansion. This design ensures that the sealing connection between the first conductive rod assembly 2 and the second conductive rod assembly 3 and both ends of the heating plate 1 no longer overly relies on the dimensional accuracy of individual components. Even if there are certain dimensional errors in the components during processing, a good sealing connection can be achieved through a reasonable sealing structure, reducing assembly instability caused by dimensional deviations and improving assembly stability and success rate.

[0042] In some embodiments, the lengths of the first hollowed-out section 15 and the second hollowed-out section 16 are 4mm-5mm. A hollowed-out section length of 4mm-5mm is relatively easy to precisely control during machining, ensuring dimensional consistency, reducing machining errors, and improving production efficiency and product quality. In this embodiment 1, the lengths and depths of the first hollowed-out section 15 and the second hollowed-out section 16 are 4.5mm, filled with high-temperature red sealing silicone. High-temperature red sealing silicone has excellent elasticity and flexibility, allowing it to tightly adhere to the surfaces of components such as the heating plate 1 and the conductive rod, filling any possible micro-gaps and unevenness, forming an effective sealing barrier.

[0043] In this embodiment 1, both the first conductive rod assembly 2 and the second conductive rod assembly 3 include a silicone sleeve 31 and a conductive rod. The silicone sleeve 31 of the first conductive rod assembly 2 is fitted onto one end of the heating plate 1, and the silicone sleeve 31 of the second conductive rod assembly 3 is fitted onto the other end of the heating plate 1. The silicone sleeve 31 of the first conductive rod assembly 2 has a through hole 4 in its center for the first heating tube cold needle 12 to pass through, and the silicone sleeve 31 of the second conductive rod assembly 3 has a through hole 4 in its center for the second heating tube cold needle 13 to pass through. The conductive rod 32 of the first conductive rod assembly 2 is threadedly connected to the first heating tube cold needle 12, and the conductive rod 32 of the second conductive rod assembly 3 is threadedly connected to the second heating tube cold needle 13. Simultaneously, tightening the threads creates a compression and expansion effect on the silicone sleeve 31, preventing the magnesium oxide filler 11 from hydrolyzing due to moisture absorption, avoiding a decrease in insulation performance, reducing the risk of leakage and short circuit in the heating tube, and ensuring the safe and stable operation of the heating tube in various harsh environments. This forms a double sealing guarantee, further enhancing the overall sealing performance of the heating tube and improving the reliability and service life of the product.

[0044] In some embodiments, to further improve the stability of the overall structure, the conductive rod 32 and the heating plate 1 are riveted together. The deformation of the rivets tightly binds the silicone sleeve 31, the conductive rod, and the heating plate 1 together, enabling them to withstand greater tensile, compressive, and shear forces. Even under frequent vibrations, stresses caused by thermal expansion and contraction, and impacts from external forces, the connections between the components remain secure, preventing loosening or detachment, thus improving the overall structural strength and reliability of the heating element.

[0045] Specifically, during operation, high-temperature silicone is injected into the hollowed-out section, and after curing, it forms the first sealing barrier. Then, a second high-temperature silicone 5 is injected above the hollowed-out section to prevent external moisture, dust, impurities, etc. from entering the heating tube, prevent the magnesium oxide filler 11 from absorbing moisture and hydrolyzing, and avoid faults such as leakage and short circuits caused by decreased insulation performance, ensuring the safe and stable operation of the heating tube in various harsh environments. Subsequently, the silicone sleeve 31 is fitted onto the end of the heating plate 1 to form the second sealing barrier. The through hole 4 is aligned with the heating tube cold needle and inserted, and the conductive rod is screwed into the cold needle thread. A rivet is used to pass through the silicone sleeve 31, the conductive rod flange, and the edge of the heating plate 1 to complete the mechanical locking.

[0046] It should be noted that the second high-temperature silicone 5 also uses high-temperature red sealing silicone. High-temperature red sealing silicone has excellent aging resistance and can maintain its elasticity and sealing performance during long-term use. It is not prone to hardening, cracking, or shrinkage due to factors such as time, temperature changes, and ultraviolet radiation, thus ensuring the durability of the sealing effect and reducing maintenance and replacement costs caused by seal failure.

[0047] This utility model also relates to a baking pan, including a baking pan body 6 and a heating element sealing structure integrally formed by die casting with the baking pan body 6. This design reduces intermediate steps and thermal resistance in heat transfer, allowing the heat generated by the heating element to be transferred to the surface of the baking pan more quickly and evenly. This not only improves the heating speed of the baking pan and shortens cooking time, but also makes the food heat more evenly, resulting in better cooking effects. During the cooking process, neither the oil produced when grilling meat nor the water used to clean the baking pan can seep into the interior of the baking pan and contact the heating element, effectively preventing short circuits, damage, and other malfunctions caused by liquid leakage, thus extending the service life of the heating element.

[0048] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0049] 1. During the operation of the heating element, the internal magnesium oxide filler 11 and heating wire 14 will cause the gas inside the tube to expand when heated. This sealing structure is tightly sealed to the heating plate 1 through the conductive rod assemblies at both ends, which can withstand the pressure generated by the expansion of the gas inside the tube, prevent gas leakage, maintain the pressure balance inside the tube, ensure the normal operation of the heating element, and avoid damage to internal components or performance degradation due to gas leakage;

[0050] 2. In existing heating element sealing structures, moisture easily penetrates the heating element under high temperature and humidity conditions, causing the magnesium oxide filler 11 to absorb moisture and hydrolyze, resulting in a significant decrease in insulation performance and increasing the risk of leakage and short circuit. The sealing structure of this invention effectively prevents external moisture from entering, protecting the magnesium oxide filler 11 from moisture, ensuring stable electrical performance of the heating element, and guaranteeing user safety. Even when submerged in water, it still maintains the insulation effect between the heating element and water.

[0051] 3. A good sealing structure prevents external impurities and moisture from entering the heating element, avoiding contamination and moisture absorption of the magnesium oxide filler 11, thus ensuring the insulation performance of the magnesium oxide filler 11. Stable insulation performance can effectively prevent electrical short circuits between the heating wire 14 and the outside environment, reduce the risk of leakage, and provide users with a safer and more reliable power environment;

[0052] 4. It can effectively block harmful substances in the external environment, such as moisture, dust, and chemicals, from entering the heating element, preventing these substances from corroding and damaging internal components such as the heating wire 14 and magnesium oxide filler 11. This extends the service life of the internal components and ensures the long-term stable operation of the heating element.

[0053] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A sealing structure for a heating element, characterized in that, include: Heating plate (1), the heating plate (1) is provided with magnesium oxide filler (11) inside, one end of the heating plate (1) is provided with a first heating tube cold needle (12) protruding from its end, the other end of the heating plate (1) is provided with a second heating tube cold needle (13) protruding from its end, and a heating wire (14) penetrating the heating plate (1) is provided between the first heating tube cold needle (12) and the second heating tube cold needle (13), and the magnesium oxide filler (11) is wrapped around the surface of the heating wire (14); The first conductive rod assembly (2) is sealed to one end of the heating plate (1); The second conductive rod assembly (3) is sealed to the other end of the heating plate (1).

2. The heating element sealing structure according to claim 1, characterized in that, One end of the heating plate (1) is provided with a first hollow section (15), and the other end of the heating plate (1) is provided with a second hollow section (16). The first hollow section (15) and the first hollow section (16) are filled with a first high-temperature silicone (17).

3. The heating element sealing structure according to claim 2, characterized in that, The lengths of the first hollowed-out section (15) and the second hollowed-out section (16) are 4mm-5mm.

4. The heating element sealing structure according to claim 1, characterized in that, Both the first conductive rod assembly (2) and the second conductive rod assembly (3) include: Silicone sleeve (31), the silicone sleeve (31) of the first conductive rod assembly (2) is sleeved on one end of the heating plate (1), and the silicone sleeve (31) of the second conductive rod assembly (3) is sleeved on the other end of the heating plate (1); The conductive rod (32) of the first conductive rod assembly (2) is threadedly connected to the first heating tube cold needle (12), and the conductive rod (32) of the second conductive rod assembly (3) is threadedly connected to the second heating tube cold needle (13).

5. The heating element sealing structure according to claim 4, characterized in that, The silicone sleeve (31) has a perforation (4) in the center for the first heating tube cold needle (12) or the second heating tube cold needle (13) to pass through.

6. The heating element sealing structure according to claim 4, characterized in that, The conductive rod (32) and the heating plate (1) are riveted together.

7. The heating element sealing structure according to claim 2, characterized in that, The first high-temperature silicone (17) is a high-temperature red sealing silicone.

8. The heating element sealing structure according to claim 4, characterized in that, A second high-temperature silicone rubber (5) is provided between the silicone sleeve (31) and the conductive rod (32).

9. A heating element sealing structure according to claim 8, characterized in that, The second high-temperature silicone (5) is a high-temperature red sealing silicone.

10. A baking pan, characterized in that, It includes a baking pan body (6) and a heating tube sealing structure as described in claim 9, which is integrally formed by die casting with the baking pan body (6).

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