High borosilicate glass kettle with magnetic layer
By using a 4J36 alloy vacuum coating as a magnetic conductive layer at the bottom of the glass pot, the problems of mismatched thermal expansion coefficients and high cost of silver paste materials are solved, thus improving the safety and economy of the glass pot.
Patent Information
- Application Number
- CN202521902836.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-04
AI Technical Summary
In existing technologies, when silver paste is used as a magnetic material in glass teapots, there are problems such as the risk of cracking due to mismatch in thermal expansion coefficients and high costs.
Using 4J36 alloy as the magnetic layer, a magnetic layer is formed on the bottom of the glass pot through vacuum coating technology. The coefficient of thermal expansion matches that of high borosilicate glass, reducing production costs.
It effectively prevents the glass pot from cracking, improves safety and service life, and significantly reduces production costs.
Smart Images
Figure CN224671270U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of water boiling appliances, specifically to a high borosilicate glass kettle with a magnetic conductive layer. Background Technology
[0002] Induction heating (IH) technology has been widely used in small kitchen appliances such as electric kettles and rice cookers due to its advantages of high efficiency, precision, and safety. In recent years, all-glass kettles have become a new market favorite due to their aesthetic appeal, chemical stability, and ease of cleaning. Applying IH technology to all-glass kettles typically requires coating the bottom of the glass with a magnetically conductive film layer (such as stainless steel or ferrite) to generate an eddy current effect for heating.
[0003] Currently, silver paste is widely used in the industry as a magnetic material. Although its electrical and magnetic conductivity is acceptable, it has two major drawbacks: Thermal expansion coefficient mismatch: Silver's thermal expansion coefficient (approximately 19.5 × 10⁻⁶) -6 / K) and the coefficient of thermal expansion of borosilicate glass (approximately 3.3×10) -6 The difference between the two (IH and K) is huge. During the hot and cold cycles of IH heating, huge thermal stress will be generated at the interface, which will make the glass pot body prone to cracking, the silver paste layer will peel off, and ultimately lead to the risk of the pot body exploding.
[0004] High cost: Silver is a precious metal with a high market price (about 9 yuan / gram), which makes the cost of glass teapots using silver paste as a magnetic conductive layer high, which is not conducive to market promotion. Utility Model Content
[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes: A high borosilicate glass teapot with a magnetic conductive layer includes a high borosilicate glass teapot body, wherein the high borosilicate glass teapot body has a magnetic conductive layer on at least the outer surface of its bottom, and the magnetic conductive layer is made of 4J36 alloy. The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the magnetic conductive layer is a vacuum coating.
[0006] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the thickness of the magnetic conductive layer is 0.1~3 mm.
[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the thickness of the magnetic conductive layer is 0.5~2mm.
[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the magnetic conductive layer is ring-shaped.
[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the diameter of the inner hole of the magnetic conductive layer ring is greater than or equal to 30mm.
[0010] The beneficial effects of this utility model are: The average coefficient of thermal expansion of 4J36 alloy in the temperature range of 20℃ to 300℃ is approximately 3.0 × 10⁻⁶. -6 / K, compared to 3.3×10 of high borosilicate glass -6 The K values are extremely close. During IH heating, both expand and contract almost synchronously, greatly eliminating interfacial thermal stress and effectively preventing cracking and shattering of the glass vessel, thus improving product safety and lifespan.
[0011] The 4J36 alloy contains approximately 63% iron, 34% nickel, and small amounts of other elements such as manganese. It has excellent magnetic permeability, fully meets the requirements for eddy current generation in electromagnetic induction heating, and has high heating efficiency.
[0012] 4J36 alloy is widely available and inexpensive, costing approximately 0.15 yuan per gram, less than one-sixtieth the cost of silver paste. Using this 4J36 alloy can significantly reduce production costs and gives it a high degree of market competitiveness. Attached Figure Description
[0013] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the borosilicate glass pot described in the embodiments of this application. Detailed Implementation
[0014] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0015] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.
[0016] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0017] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0018] Reference Figure 1 The present application proposes an embodiment of a high borosilicate glass teapot with a magnetic conductive layer, which includes a high borosilicate glass teapot body 10. The high borosilicate glass teapot body 10 has a magnetic conductive layer 20 on at least its bottom outer surface. The magnetic conductive layer 20 is made of 4J36 alloy. The 4J36 alloy, also known as Invar alloy, has an average coefficient of thermal expansion of approximately 3.0 × 10⁻⁶ in the temperature range of 20℃ to 300℃. -6 / K, compared to 3.3×10 of high borosilicate glass -6 The K values are extremely close. During IH heating, both expand and contract almost synchronously, greatly eliminating interfacial thermal stress and effectively preventing cracking and shattering of the glass vessel, thus improving product safety and lifespan.
[0019] The 4J36 alloy contains approximately 63% iron, 34% nickel, and small amounts of other elements such as manganese. It has excellent magnetic permeability, fully meets the requirements for eddy current generation in electromagnetic induction heating, and has high heating efficiency.
[0020] 4J36 alloy is widely available and inexpensive, costing approximately 0.15 yuan per gram, which is less than one-sixtieth of the cost of silver paste material, which is about 9 yuan per gram. Using this 4J36 alloy material can significantly reduce production costs and gives it a very high market competitiveness.
[0021] Preferably, the magnetic layer 20 is a vacuum-plated layer. The vacuum plating process can form a tight and firm 4J36 alloy plating layer on the outer surface of the bottom of the high borosilicate glass pot, ensuring excellent adhesion between the magnetic layer 20 and the glass body, making it difficult to fall off. Even under frequent use and temperature changes, it can maintain a stable structure and ensure normal heating function.
[0022] Vacuum plating can uniformly form a coating on the complex curved surface of the bottom of a glass pot. It can achieve good preparation of the magnetic conductive layer 20 for high borosilicate glass pots of different shapes and sizes, ensuring the consistency and stability of product quality.
[0023] Preferably, the thickness of the magnetic conductive layer 20 is 0.1~3 mm, specifically, the thickness of the magnetic conductive layer 20 is 0.5~2 mm.
[0024] When the thickness of the magnetic layer 20 is within this range, at room temperature, the ratio of its thickness to skin depth meets the requirement of "thick material" in electromagnetic induction heating, which can ensure high heating efficiency. At the same time, considering that the thermal conductivity of 4J36 alloy is low, this thickness range will not excessively increase the thermal resistance, which can ensure that heat is transferred from the magnetic layer 20 to the glass pot and the internal liquid in a timely and effective manner, avoid excessive heat accumulation in the alloy layer, prevent excessive thermal stress from causing the glass to crack, and balance heating efficiency and thermal conductivity.
[0025] Within this thickness range, the 4J36 alloy magnetic layer 20 possesses sufficient mechanical strength and toughness to withstand thermal stress and mechanical impact during daily use. From a processing perspective, it avoids both processing difficulties and cost spikes due to excessive thinness and inconveniences to subsequent processing due to excessive thickness, thus ensuring the feasibility and economy of the product in the manufacturing process.
[0026] Preferably, the magnetic conductive layer 20 is annular. The magnetic field distribution of an induction cooker is usually stronger in the central region. The annular magnetic conductive layer 20 can better match this magnetic field distribution characteristic, which helps to form a relatively uniform temperature distribution at the bottom of the glass pot and avoids local overheating in the center.
[0027] The annular magnetic conductive layer 20 forms a hollow area inside. The hollow area avoids the formation of a high-temperature area in the middle of the magnetic conductive layer 20, while facilitating the insertion of the temperature sensing probe of the induction cooker at the bottom into the ring to detect the temperature of the borosilicate glass kettle body 10.
[0028] The diameter of the annular hole 21 of the magnetic conductive layer 20 is greater than or equal to 30 mm.
[0029] The area of the inner hole 21 of the magnetic conductive layer 20 is large enough to avoid the temperature in the avoidance area from being affected by the radiant heat and conductive heat generated by the magnetic conductive layer 20 during the heating process, thus affecting the accuracy of the temperature detection results.
[0030] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.
Claims
1. A high borosilicate glass teapot with a magnetically conductive layer, characterized in that, The container includes a high borosilicate glass kettle body (10), which has a magnetic conductive layer (20) on its outer surface at least at the bottom. The magnetic conductive layer (20) is made of 4J36 alloy.
2. The high borosilicate glass teapot with a magnetic conductive layer according to claim 1, characterized in that, The magnetic conductive layer (20) is a vacuum-coated layer.
3. The high borosilicate glass teapot with a magnetically conductive layer according to claim 1, characterized in that, The thickness of the magnetic conductive layer (20) is 0.1~3 mm.
4. The high borosilicate glass teapot with a magnetic conductive layer according to claim 3, characterized in that, The thickness of the magnetic conductive layer (20) is 0.5~2mm.
5. The high borosilicate glass teapot with a magnetically conductive layer according to any one of claims 1 to 4, characterized in that, The magnetic conductive layer (20) is ring-shaped.
6. The high borosilicate glass teapot with a magnetic conductive layer according to claim 5, characterized in that, The diameter of the annular hole (21) of the magnetic conductive layer (20) is greater than or equal to 30 mm.