Vacuum heatable vacuum cup and manufacturing method thereof

Abstract

The application discloses a vacuum heatable vacuum cup and a manufacturing method thereof, which comprises the following steps: the inner shell is arranged in the inner part of the outer shell, a first vacuum layer is arranged between the side wall of the inner shell and the side wall of the outer shell; a second vacuum layer is arranged between the bottom wall of the inner shell and the bottom wall of the outer shell, the bottom wall of the inner shell is provided with a heating assembly; the charging assembly is fixed to the bottom of the outer shell, the outer wall of the outer shell is provided with a through hole, and the interface assembly is embedded in the through hole; the charging assembly and the heating assembly are electrically connected through a first wire, and the charging assembly and the interface assembly are electrically connected through a second wire; wherein the inner wall of the through hole and the outer wall of the interface assembly have a gap, and the gap is filled with a first sealing layer, a second sealing layer and a third sealing layer. The application realizes the unity of long-acting heat preservation and high-efficiency heating, realizes periodical vacuum degree on-line monitoring, and realizes a high-efficiency manufacturing process with one process and double effects.

Description

Technical Field

[0001] This invention relates to the technical field of thermos cups and related technologies, and in particular to a vacuum heatable thermos cup and its manufacturing method. Background Technology

[0002] The heat preservation performance of vacuum insulated cups relies on the low thermal conductivity of the vacuum layer between the inner and outer liner. In recent years, products integrating electric heating functions into vacuum insulated cups have appeared on the market, typically with a heating element located at the bottom of the inner liner and powered via a USB interface. However, incorporating a USB interface into a vacuum insulated cup presents a significant technical challenge: there is a fundamental conflict between the need for a completely sealed vacuum layer and the requirement for a through-hole electrical interface.

[0003] Existing technologies mainly employ two types of solutions. The first type places the USB interface and heating component in a bottom shell cavity independent of the vacuum layer (such as CN223731133U). Although this avoids the problem of vacuum penetration, the bottom shell cavity lacks vacuum insulation protection, resulting in rapid heat dissipation, which leads to a large loss of heat from the heating component, low heating efficiency, and increases the thickness of the bottom of the thermos.

[0004] The second approach uses sealing rings or ordinary potting compound to seal the wire penetration points. However, ordinary rubber sealing rings have microscopic leakage channels, and ordinary potting compound will continuously release gas in a high vacuum environment (i.e., gas release effect), causing the vacuum level to drop sharply over time, eventually losing its heat preservation function. Summary of the Invention

[0005] In view of this, and to solve the above problems, the purpose of this invention is to provide a vacuum-heatable thermos cup, comprising: Inner shell, outer shell, heating component, charging component, interface component; The inner shell is installed inside the outer shell, and a first vacuum layer is provided between the side wall of the inner shell and the side wall of the outer shell; A second vacuum layer is provided between the bottom wall of the inner shell and the bottom wall of the outer shell, and a heating component is provided on the bottom wall of the inner shell; The charging component is fixed to the bottom of the housing, and the outer wall of the housing is provided with a through hole, into which the interface component is embedded; The charging component and the heating component are electrically connected via a first wire, and the charging component and the interface component are electrically connected via a second wire; The inner wall of the through hole and the outer wall of the interface assembly have a gap, which is filled with a first sealing layer, a second sealing layer and a third sealing layer.

[0006] In the aforementioned vacuum-heatable thermos cup, a partition is welded to the inner wall of the outer shell, and a bottom cover is welded to the bottom of the inner shell. A first vacuum layer extends downward from between the inner shell and the side wall of the outer shell to between the partition and the bottom cover. A connecting channel is formed between the partition and the bottom cover. A second vacuum layer communicates with the space between the partition and the bottom cover through the connecting channel. A first wire passes through the connecting channel and is electrically connected to the heating component.

[0007] The aforementioned vacuum-heatable thermos cup further includes: a vacuum sensor, which is disposed in the second vacuum layer and is signal-connected to an external temperature control module.

[0008] In the aforementioned vacuum-heatable thermos cup, the first sealing layer is made of low vapor pressure epoxy resin vacuum sealant.

[0009] In the aforementioned vacuum-heatable thermos cup, the second sealing layer is a glassy sealing layer, and the second sealing layer covers the first sealing layer.

[0010] In the aforementioned vacuum-heatable thermos cup, the third sealing layer is located between the second sealing layer and the inner wall of the through hole.

[0011] In the aforementioned vacuum-heatable thermos cup, both the first and second wires are flat wires.

[0012] A method for manufacturing a vacuum-heatable thermos cup, comprising the aforementioned vacuum-heatable thermos cup. Step S1: Prepare the inner shell, the outer shell and the interface assembly respectively. Clean and roughen the bottom of the inner shell. Process the bottom sidewall of the outer shell to form the through hole. Pre-process the bottom of the outer shell to form the vacuum hole for vacuuming. Step S2: Fix the heating component to the bottom of the inner shell, fix the charging component to the bottom of the outer shell, fix the interface component to the through hole, and electrically connect the heating component, the charging component and the interface component through the first wire and the second wire; Step S3: Pre-coat the inner wall of the through hole with a third sealing layer material, and pre-coat the outer wall of the interface assembly with a first sealing layer material and a second sealing layer material from the inside to the outside. The first sealing layer material is a low vapor pressure epoxy resin vacuum sealant, and the second sealing layer material is lead-free bismuthate glass powder. Insert the interface assembly into the through hole, so that the first sealing layer material, the second sealing layer material, and the third sealing layer material are arranged in a hierarchical manner from the inside to the outside within the gap. Step S4: Place the assembled thermos cup into a vacuum heating furnace, heat it and keep it at that temperature for a preset time so that the third sealing layer, the second sealing layer and the first sealing layer melt and fill the gap. Then cool and solidify it. At the same time, perform a vacuuming operation on the first vacuum layer and the second vacuum layer through the evacuation hole.

[0013] The above-mentioned method for manufacturing a vacuum-heatable thermos cup includes preparing the partition and the bottom cover based on step S1, and welding the connecting channel between the partition and the bottom cover.

[0014] The positive effects of the above technical solution compared with the existing technology are: 1. Achieving a balance between long-lasting heat preservation and efficient heating: An innovative three-tiered sealing system is employed at the USB interface: a first sealing layer (low vapor pressure epoxy resin), a second sealing layer (a dedicated lead-free bismuthate glassy layer), and a third sealing layer (a gradient transition layer for thermal expansion). The low vapor pressure material eliminates the outgassing effect under high vacuum conditions; the glassy layer achieves a core gas-tight seal; and the gradient transition layer perfectly buffers the difference in thermal expansion coefficients between the glass and stainless steel shell, eliminating cooling micro-cracks. By placing the heating component within a vacuum layer, the problem of "rapid heat loss and low efficiency due to external heating" in existing technologies is completely solved.

[0015] 2. Enables online monitoring of periodic vacuum levels: A miniature vacuum sensor is integrated into the second vacuum layer, breaking the limitation of traditional thermos cups that can only be tested offline at the factory. Users can monitor the vacuum status inside the cup in real time through an external terminal or indicator light, receiving early warnings before the insulation performance deteriorates, greatly improving the product experience and safety.

[0016] 3. High-efficiency manufacturing process with "dual benefits in one process": During manufacturing, a vacuum heating furnace at 420-480℃ is used to simultaneously complete the high-temperature degassing of the vacuum layer, the melting and solidification of the three-stage sealing layer, and the vacuum sealing operation in the same step. This not only simplifies the process flow but also ensures a perfect combination between the sealing layer and the vacuum layer, significantly improving the product yield and consistency.

[0017] 4. The first and second wires in this device are flat wires: using flat wires of a specific size to replace traditional round wires reduces the cross-section and significantly reduces the difficulty of sealing, while having low resistance characteristics and being able to stably carry a high power input of up to 60W, thus realizing the rapid heating of the thermos cup. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a vacuum-heatable thermos cup according to a first embodiment of the present invention.

[0019] Figure 2This is a schematic diagram of a second embodiment of a vacuum-heatable thermos cup according to the present invention.

[0020] Figure 3 This is a schematic diagram of the first sealing layer, the second sealing layer, and the third sealing layer in this invention.

[0021] 1. Inner shell; 2. Outer shell; 3. Heating component; 4. Charging component; 5. Interface component; 6. First vacuum layer; 7. Second vacuum layer; 8. First wire; 9. Second wire; 10. First sealing layer; 11. Second sealing layer; 12. Third sealing layer; 13. Partition; 14. Bottom cover; 15. Connecting channel; 16. Vacuum sensor. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0023] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0024] like Figures 1 to 3 As shown, a preferred embodiment of a vacuum-heated thermos cup is illustrated, which includes: an inner shell 1, an outer shell 2, a heating component 3, a charging component 4, and an interface component 5.

[0025] The inner shell 1 is installed inside the outer shell 2. A first vacuum layer 6 is provided between the side wall of the inner shell 1 and the side wall of the outer shell 2. A second vacuum layer 7 is provided between the bottom wall of the inner shell 1 and the bottom wall of the outer shell 2. A heating component 3 is provided on the bottom wall of the inner shell 1. A charging component 4 is fixed to the bottom of the outer shell 2. A through hole is provided on the outer wall of the outer shell 2. An interface component 5 is embedded in the through hole. The charging component 4 and the heating component 3 are electrically connected through a first wire 8. The charging component 4 and the interface component 5 are electrically connected through a second wire 9. There is a gap between the inner wall of the through hole and the outer wall of the interface component 5. The gap is filled with a first sealing layer 10, a second sealing layer 11 and a third sealing layer 12.

[0026] In actual use, this device can heat the liquid inside the inner shell 1 through the heating component 3, and the first vacuum layer 6 and the second vacuum layer 7 make the inner shell 1 have a better heat preservation effect on its interior. The charging component 4 provides power to the heating component 3, and can be charged through the interface component 5. The interface component 5 and the through hole of the outer shell 2 are provided with a first sealing layer 10, a second sealing layer 11 and a third sealing layer 12, which makes the vacuum degree inside the thermos cup more reliable and ensures the long-term stability of the vacuum degree.

[0027] In addition to the above, the present invention also has the following embodiments: Furthermore, in a vacuum-heatable thermos cup, a partition 13 is welded to the inner wall of the outer shell 2, and a bottom cover 14 is welded to the bottom of the inner shell 1. A first vacuum layer 6 extends downward from between the side walls of the inner shell 1 and the outer shell 2 to between the partition 13 and the bottom cover 14. A connecting channel 15 is formed between the partition 13 and the bottom cover 14. A second vacuum layer 7 is connected to the space between the partition 13 and the bottom cover 14 through the connecting channel 15. A first wire 8 passes through the connecting channel 15 and is electrically connected to the heating component 3.

[0028] In Embodiment 1, a first vacuum layer 6 is formed between the outer wall of the inner shell 1 and the inner wall of the outer shell 2, and a second vacuum layer 7 is formed between the bottom of the inner shell 1 and the bottom of the outer shell 2. The heating component 3 and the charging component 4 are both disposed in the second vacuum layer 7.

[0029] In Embodiment 2, a partition 13 is welded to the inner wall of the outer shell 2, and a bottom cover 14 is welded to the bottom of the inner shell 1. A connecting channel 15 connects the partition 13 and the bottom cover 14. Spatially, the heating component 3 and the charging component 4 are still arranged in the second vacuum layer 7, which can ensure the vacuum degree of the thermos cup, thereby ensuring the heat preservation effect of the thermos cup.

[0030] Furthermore, a vacuum-heatable thermos cup also includes a vacuum sensor 16, which is disposed in the second vacuum layer 7 and is signal-connected to an external temperature control module. Specifically, the vacuum sensor 16 collects the vacuum level of the thermos cup and transmits the signal to the external temperature control module, which then transmits the signal to a terminal such as a mobile phone or computer to alert the user. This device can also have an indicator light on the outside of the outer casing 2, with the vacuum sensor 16 connected to it. The indicator light flashes or changes color to alert the user.

[0031] Furthermore, in a vacuum-heatable thermos cup, the first sealing layer 10 is made of low vapor pressure epoxy resin vacuum sealant. Specifically, the first sealing layer 10, made of low vapor pressure epoxy resin vacuum sealant, fills the gap between the interface component 5 and the inner wall of the through hole, with a sealant thickness of 0.2-0.5 mm.

[0032] Furthermore, in a vacuum-heatable thermos cup, the second sealing layer 11 is a glassy sealing layer, covering the first sealing layer 10. The second sealing layer 11 is a glassy sealing layer formed by melting a special lead-free bismuthate glass powder, covering the outside of the first sealing layer 10. A third sealing layer 12 is disposed between the second sealing layer 11 and the outer shell 2, and is composed of two transition materials with a total thickness of approximately 50-200 μm.

[0033] Furthermore, in a vacuum-heatable thermos cup, a third sealing layer 12 is located between the second sealing layer 11 and the inner wall of the through-hole. Specifically, it is disposed between the second sealing layer 11 and the outer shell 2, the outer shell 2 being made of stainless steel. The third sealing layer 12 is composed of at least two materials with thermal expansion coefficients between those of the glassy sealing layer of the second sealing layer 11 and the outer shell 2, forming a smooth transition in expansion coefficients. The total thickness of the gradient layer is 50-200 μm, and it can be prepared by plasma spraying or screen printing and sintering.

[0034] Furthermore, in a vacuum-heatable thermos cup, both the first wire 8 and the second wire 9 are flat wires. Specifically, flat wires have low resistance characteristics and can carry a larger current.

[0035] A method for manufacturing a vacuum-heatable thermos cup, comprising the aforementioned vacuum-heatable thermos cup. Step S1: Prepare the inner shell 1, outer shell 2 and interface assembly 5 respectively. Clean and roughen the bottom of the inner shell 1. Process the bottom sidewall of the outer shell 2 to form a through hole. Pre-process the bottom of the outer shell 2 to form an air extraction hole for vacuuming. Step S2: Fix the heating component 3 to the bottom of the inner shell 1, fix the charging component 4 to the bottom of the outer shell 2, fix the interface component 5 to the through hole, and electrically connect the heating component 3, the charging component 4 and the interface component 5 through the first wire 8 and the second wire 9. Step S3: Pre-coat the inner wall of the through hole with the third sealing layer 12 material, and pre-coat the outer wall of the interface assembly 5 with the first sealing layer 10 material and the second sealing layer 11 material sequentially from the inside to the outside. The first sealing layer 10 material is a low vapor pressure epoxy resin vacuum sealant, and the second sealing layer 11 material is lead-free bismuthate glass powder. Insert the interface assembly 5 into the through hole, so that the first sealing layer 10 material, the second sealing layer 11 material, and the third sealing layer 12 material are arranged in a hierarchical manner from the inside to the outside within the gap. Step S4: Place the assembled thermos cup into a vacuum heating furnace, heat it, and maintain the temperature for a preset time to allow the third sealing layer 12, the second sealing layer 11, and the first sealing layer 10 to melt and fill the gaps. Then, cool and solidify the mixture. Simultaneously, evacuate the first vacuum layer 6 and the second vacuum layer 7 through the evacuation port. Specifically, evacuate the vacuum heating furnace and heat it to 420-480℃, maintaining this temperature for 10-30 minutes. This temperature window simultaneously satisfies the following conditions: the first vacuum layer 6 and the second vacuum layer 7 are fully degassed; and the first sealing layer 10, the second sealing layer 11, and the third sealing layer 12 fill the through-holes in the interface assembly 5 and the outer shell 2. The sealing and evacuation are completed simultaneously in the same process, achieving "dual efficiency in one operation."

[0036] Furthermore, a method for manufacturing a vacuum-heatable thermos cup includes preparing a partition 13 and a bottom cover 14 based on step S1, and welding a connecting channel 15 between the partition 13 and the bottom cover 14.

[0037] Specifically, during the preparation of the evacuation port, a special lead-free bismuthate glass powder slurry is pre-coated around the evacuation port. The slurry is composed of glass powder and an organic binder and can be applied precisely in a quantitative manner by dispensing or coating. When the device is placed in a vacuum furnace, and a vacuum is evacuated through the evacuation port to the first vacuum layer 6 and the second vacuum layer 7, the slurry melts and seals the evacuation port.

[0038] Specifically, for the outer shell 2 made of different stainless steel materials, such as austenitic 304 stainless steel and ferritic 430 stainless steel, due to the slight difference in the coefficient of thermal expansion, the proportion of lead-free bismuthate glass powder used in the second sealing layer 11 is finely adjusted. When the outer shell 2 and inner shell 1 are made of 430 ferritic stainless steel (with a coefficient of thermal expansion of approximately 10.4 × 10⁻⁶), the ratio of lead-free bismuthate glass powder is adjusted accordingly. -6 To achieve better matching at ℃, the proportion of low-expansion coefficient fillers (such as β-lithium nepheline microcrystalline powder) was increased in the glass powder formulation. After adjustment, the volumetric thermal expansion coefficient of the glass powder was reduced from 9.8 × 10⁻⁶. -6 / ℃ decreased to 10.1×10 -6 / ℃, resulting in better thermal compatibility with the 430 stainless steel substrate. Correspondingly, the number and thickness ratio of the transition material layers in the third sealing layer 12 have also been optimized, using a coefficient of thermal expansion of 10.2×10⁻⁶. -6 Glass-ceramic composite materials with a temperature of / ℃ and a coefficient of thermal expansion of 10.0×10⁻⁶ -6 The composite material composition at / ℃ achieves a smoother stress transition.

[0039] Furthermore, a method for manufacturing a vacuum-heatable thermos cup includes preparing a partition 13 and a bottom cover 14 based on step S1, and welding a connecting channel 15 between the partition 13 and the bottom cover 14.

[0040] Specifically, the interface component 5 in this device can adopt a Type-C interface. The Type-C interface has the advantages of reversible plugging and supports higher power transmission. The first wire 8 and the second wire 9 in this device use flat wires with a width of 5mm and a thickness of 0.2mm, which can carry a maximum power input of 60W. The heating component 3 in this device uses a heating film, which is formed by thick-film printed resistance paste. A layer of ruthenium-based resistance paste is printed on the outer surface of the bottom of the inner shell 1 using a screen printing process. After high-temperature sintering, a dense thick-film heating layer with a thickness of about 0.05-0.1mm is formed. This thick-film heating layer has the advantages of fast thermal response and uniform power density.

[0041] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum-heatable thermos cup, characterized in that, include: Inner shell, outer shell, heating component, charging component, interface component; The inner shell is installed inside the outer shell, and a first vacuum layer is provided between the side wall of the inner shell and the side wall of the outer shell; A second vacuum layer is provided between the bottom wall of the inner shell and the bottom wall of the outer shell, and a heating component is provided on the bottom wall of the inner shell; The charging component is fixed to the bottom of the housing, and the outer wall of the housing is provided with a through hole, into which the interface component is embedded; The charging component and the heating component are electrically connected via a first wire, and the charging component and the interface component are electrically connected via a second wire; The inner wall of the through hole and the outer wall of the interface assembly have a gap, which is filled with a first sealing layer, a second sealing layer and a third sealing layer.

2. The vacuum-heatable thermos cup according to claim 1, characterized in that, A partition is welded to the inner wall of the outer shell, and a bottom cover is welded to the bottom of the inner shell. The first vacuum layer extends downward from between the inner shell and the side wall of the outer shell to between the partition and the bottom cover. A connecting channel is formed between the partition and the bottom cover. The second vacuum layer communicates with the space between the partition and the bottom cover through the connecting channel. The first wire passes through the connecting channel and is electrically connected to the heating component.

3. A vacuum-heatable thermos cup according to claim 1, characterized in that, Also includes: A vacuum sensor is disposed in the second vacuum layer and is connected to an external temperature control module.

4. A vacuum-heatable thermos cup according to claim 1, characterized in that, The first sealing layer is made of low vapor pressure epoxy resin vacuum sealant.

5. A vacuum-heatable thermos cup according to claim 1, characterized in that, The second sealing layer is a glassy sealing layer, and the second sealing layer covers the first sealing layer.

6. A vacuum-heatable thermos cup according to claim 1, characterized in that, The third sealing layer is located between the second sealing layer and the inner wall of the through hole.

7. A vacuum-heatable thermos cup according to claim 1, characterized in that, Both the first conductor and the second conductor are flat conductors.

8. A method for manufacturing a vacuum-heatable thermos cup, characterized in that, Including a vacuum-heatable thermos cup as described in any one of claims 1-7, Step S1: Prepare the inner shell, the outer shell and the interface assembly respectively. Clean and roughen the bottom of the inner shell. Process the bottom sidewall of the outer shell to form the through hole. Pre-process the bottom of the outer shell to form the vacuum hole for vacuuming. Step S2: Fix the heating component to the bottom of the inner shell, fix the charging component to the bottom of the outer shell, fix the interface component to the through hole, and electrically connect the heating component, the charging component and the interface component through the first wire and the second wire; Step S3: Pre-coat the inner wall of the through hole with a third sealing layer material, and pre-coat the outer wall of the interface assembly with a first sealing layer material and a second sealing layer material from the inside to the outside. The first sealing layer material is a low vapor pressure epoxy resin vacuum sealant, and the second sealing layer material is lead-free bismuthate glass powder. Insert the interface assembly into the through hole, so that the first sealing layer material, the second sealing layer material, and the third sealing layer material are arranged in a hierarchical manner from the inside to the outside within the gap. Step S4: Place the assembled thermos cup into a vacuum heating furnace, heat it and keep it at that temperature for a preset time so that the third sealing layer, the second sealing layer and the first sealing layer melt and fill the gap. Then cool and solidify it. At the same time, perform a vacuuming operation on the first vacuum layer and the second vacuum layer through the evacuation hole.

9. The method for manufacturing a vacuum-heatable thermos cup according to claim 1, characterized in that, Based on step S1, the partition and the bottom cover are prepared, and the connecting channel is formed by welding between the partition and the bottom cover.

Images