Concave-convex ball array type heating surface structure capable of improving heating rate

Abstract

The invention discloses a concave-convex ball array type heating surface structure capable of improving the heating rate, and relates to the related technical field of heating containers. The heating surface comprises an inner layer and an outer layer, the inner layer is made of pure titanium, titanium alloy or stainless steel, and the outer layer is made of a metal heat-conducting plate; the surface, making contact with materials, of the inner layer is of a pure titanium or titanium alloy or stainless steel array type concave-convex ball structure, and a concave-convex spherical surface is produced on the inner layer through a high-temperature integrated die-casting forming technology. The bottom of the outer surface of the inner layer adopts a mold pouring process, a high-thermal-conductivity metal material is poured at the bottom of the formed titanium or stainless steel heating container to form the outer layer, and the inner layer and the outer layer are integrally connected by utilizing binding force and molecular force between contact surfaces of titanium, titanium alloy or stainless steel and the high-thermal-conductivity metal material. And when the heating container must be made of materials with low thermal conductivity, such as titanium, titanium alloy and stainless steel, the heating efficiency can be greatly improved, and the effects of energy conservation, environmental protection and health are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to heating containers, and in particular to a concave-convex ball array heating surface structure capable of improving the heating rate. Background Art

[0002] Titanium and titanium alloys have excellent comprehensive properties. They have excellent corrosion resistance. Titanium also has very good "biophilicity". In the human body, it can resist the corrosion of secretions and is completely non-toxic and adaptable to any sterilization method. Therefore, titanium is the most suitable metal for making food and medical equipment. However, the biggest disadvantage of titanium as a heating container is its low thermal conductivity. The thermal conductivity of titanium is 15.24W / (m·K), which is only 19% of iron and 6.4% of aluminum. This makes it less efficient to use it directly as a heating container.

[0003] At the same time, in most industrial and commercial application scenarios and when low corrosion and metal pollution requirements are not strict, 304 and 316 stainless steel are the best choices for low-cost heating containers. However, the thermal conductivity coefficient of 304 stainless steel is 16-24W / (m·K), and the thermal conductivity coefficient of 316 stainless steel is 16.2W / (m·K), so there is also the disadvantage of low heating efficiency. And because of their low thermal conductivity, they may also cause local overheating during the heating process, destroying their corrosion resistance, accelerating the precipitation of heavy metals, and reducing the service life of the equipment.

[0004] Moreover, in most existing heating products on the market, such as a series of products such as the inner pot of an electric rice cooker, the heating surface and the internal heating surface are both flat (or slightly convex) surfaces. The same is true for the heating of cylindrical rollers. The surface area of ​​the inner cylinder is the heat transfer area for heating. Such planes cannot maximize the efficiency of heat transfer. In summary, the thermal conductivity of titanium metal sheets and stainless steel metal sheets is poor. The thermal efficiency of directly using them to make existing conventional heating surface structures is too low. It is necessary to improve their thermal conductivity efficiency. In addition, if titanium metal sheets are directly used in cold die casting to make heating containers, there will be a problem of die casting corner springback after die casting demolding. In view of this, in-depth research was conducted on the above problems, resulting in this case. Summary of the invention

[0005] The purpose of the present invention is to provide a concave-convex ball array heating surface structure that can improve the heating rate, so as to solve the problems mentioned in the above background technology that heating containers made of pure titanium, titanium alloy or stainless steel materials have low heat conduction efficiency and pure titanium metal plates are not easy to process.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a concave-convex ball array heating surface structure capable of increasing the heating rate;

[0007] The heating surface comprises an inner layer and an outer layer, wherein the inner layer is made of pure titanium, titanium alloy or stainless steel, and the outer layer is made of a metal heat conducting plate;

[0008] The inner layer in contact with the material surface is an array of concave-convex spheres made of pure titanium, titanium alloy or stainless steel, and the inner layer is produced by a high-temperature integrated die-casting process to produce the concave-convex sphere surface;

[0009] The bottom of the outer surface of the inner layer adopts a mold casting process, and a high thermal conductivity metal material is cast on the bottom of the already formed titanium or stainless steel heating container to form the outer layer. The inner layer and the outer layer are integrated by the bonding force and molecular force between the contact surface of titanium, titanium alloy or stainless steel and the high thermal conductivity metal material.

[0010] Preferably, the stainless steel of the inner layer is 304 stainless steel or 316 stainless steel.

[0011] Preferably, the titanium alloy of the inner layer is an α+β type titanium alloy.

[0012] Preferably, the heat conducting plate of the outer layer is made of pure aluminum or copper, and the metal heat conducting plate of the outer layer is also in the form of a convex surface that completely fits the concave and convex spherical surface of the inner layer, forming a coherent heat conduction process.

[0013] Preferably, the heat conduction process is specifically as follows: the external heating module conducts heat to the outer metal heat conducting plate, and then the outer layer of the metal heat conducting plate conducts heat to the inner layer of pure titanium, titanium alloy or stainless steel, and finally the heat is transferred to the heated material through the array-type concave and convex spherical surface.

[0014] Preferably, the application of the heating surface structure includes heating containers made of titanium, titanium alloy and stainless steel for heating liquid materials.

[0015] Preferably, the application fields of the heating surface structure include: electric rice cookers, steamers, and pressure cookers in the civilian field; Chinese medicine boiling kettles, extract preparation heating kettles, and sterilization pressure vessels in the commercial field; and reaction kettles, batching tanks, and stirring tanks that need to be heated in the chemical, pharmaceutical, and smelting and purification industries in the industrial field.

[0016] Preferably, the application of the heating surface structure specifically includes heating the bottom heating surface of a cooking pot, a reaction kettle, a batching tank, a mixing barrel, and the outer surface heating of a cylindrical barrel.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the concave-convex ball array heating surface structure that can increase the heating rate is mainly suitable for heating liquid materials and the heating container must use titanium, titanium alloy, stainless steel and other materials with low thermal conductivity. It can greatly improve the heating efficiency and achieve energy saving, environmental protection and health effects (applicable to both electric heating and flame heating). Applicable to: electric rice cookers, cooking pots, pressure cookers in the civilian field; Chinese medicine boiling kettles, extract preparation heating kettles, and sterilization pressure vessels in the commercial field. The chemical, pharmaceutical, smelting and purification industries in the industrial field require heating of reactors, batching tanks, stirring tanks and other equipment; and this heating surface structure can be widely used in the bottom heating surface of cooking pots, reactors, batching tanks, stirring barrels, and the outer surface heating of cylindrical barrels.

[0018] The concave-convex ball array heating surface of the present invention adds a concave-convex spherical surface on the basis of a plane. Under the premise that the heating surface area of ​​the heating source remains unchanged, the heating area of ​​the concave-convex ball heating surface and the heated material is greatly increased, the heating area is increased, the heat utilization rate is improved, and it is more energy-saving and environmentally friendly. Compared with the traditional structure, it uses pure aluminum or other high thermal conductivity metal materials as the heat conduction plate. The thermal conductivity coefficient of aluminum is about 237W / m·K, which has good thermal conductivity. Moreover, the heating area is an array-type concave-convex spherical surface. The heating area increases geometrically with the increase of the heating surface area of ​​the heating equipment (for example: the inner pot of a 22CM electric pressure cooker adopts a concave-convex ball structure to increase by 10%; the inner pot of a 38CM electric pressure cooker adopts a concave-convex ball structure to increase by 25%), and the contact area with the material is significantly increased, so the heating effect is more significantly improved. Using this structure for heating can make the heated object heated more evenly and reduce the situation where the local temperature is too high or too low. The inner pot of a steaming pot and a pressure cooker made of pure titanium or titanium alloy is also safer and healthier for steaming food.

[0019] In terms of strength, pure titanium or titanium alloy has excellent comprehensive performance, low density, high specific strength and specific fracture toughness, good fatigue strength and crack growth resistance, and excellent corrosion resistance. Titanium is resistant to both high and low temperatures, and can maintain high strength and mechanical properties in a wide temperature range of -253℃ to +500℃. The inner liner of the pressure cooker made of it has higher strength, higher pressure resistance, and higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the inner layer of the present invention;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the inner layer of the present invention from another viewing angle;

[0023] Figure 4This is a schematic diagram of the outer three-dimensional structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the heating surface structure and heat conduction analysis of the present invention;

[0025] Figure 6 This is a schematic diagram of the front structure of Comparative Example 1 of the present invention;

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the cross-section structure at AA in the middle;

[0027] Figure 8 This is a schematic diagram of the top view of the structure of Comparative Example 1 of the present invention;

[0028] Fig. 9 This is a schematic diagram of the front structure of Comparative Example 2 of the present invention;

[0029] Fig.10 For the present invention Fig. 9 Schematic diagram of the cross-section structure at BB in the middle;

[0030] Fig.11 This is a schematic diagram of the top view of the structure of Comparative Example 2 of the present invention;

[0031] Fig.12 This is a schematic diagram of the front structure of a reference example of the present invention;

[0032] Fig.13 For the present invention Fig.12 Schematic diagram of the cross-section structure at CC;

[0033] Fig.14 It is a schematic diagram of a top view of the structure of a reference example of the present invention.

[0034] In the figure: 1, inner layer; 2, outer layer; 3, concave and convex spherical surface. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-14 The present invention provides the following technical solutions:

[0037] A concave-convex ball array heating surface structure capable of increasing the heating rate;

[0038] The heating surface comprises an inner layer 1 and an outer layer 2, wherein the inner layer 1 is made of pure titanium, titanium alloy or stainless steel, and the outer layer 2 is made of a metal heat conducting plate;

[0039] The surface of the inner layer 1 in contact with the material is an array of concave-convex spheres made of pure titanium, titanium alloy or stainless steel, and the inner layer 1 is produced by a high-temperature integrated die-casting process to produce a concave-convex spherical surface 3;

[0040] The bottom of the outer surface of the inner layer 1 is cast using a mold casting process, and a high thermal conductivity metal material is cast on the bottom of the already formed titanium or stainless steel heating container to form the outer layer 2. The inner layer 1 and the outer layer 2 are integrated by utilizing the bonding force and molecular force between the contact surface of titanium, titanium alloy or stainless steel and the high thermal conductivity metal material.

[0041] The stainless steel of the inner layer 1 is 304 stainless steel or 316 stainless steel.

[0042] The titanium alloy of the inner layer 1 is an α+β type titanium alloy.

[0043] The heat conducting plate of the outer layer 2 is made of pure aluminum or copper. The metal heat conducting plate of the outer layer 2 is also in the form of a convex surface, which completely fits the concave-convex spherical surface 3 of the inner layer 1, forming a continuous heat conduction process.

[0044] The specific heat conduction process is as follows: the external heating module conducts heat to the metal heat conducting plate of the outer layer 2, and then the metal heat conducting plate outer layer 2 conducts heat to the pure titanium, titanium alloy or stainless steel inner layer 1, and finally the heat is transferred to the heated material through the array-type concave-convex spherical surface 3.

[0045] Applications of the heating surface structure include titanium, titanium alloy and stainless steel heating vessels for heating liquid materials.

[0046] The application areas of the heating surface structure include: electric rice cookers, steamers, and pressure cookers in the civilian field; Chinese medicine boiling kettles, extract preparation heating kettles, and sterilization pressure vessels in the commercial field; and reactors, batching tanks, and mixing tanks that require heating in the chemical, pharmaceutical, and smelting and purification industries in the industrial field.

[0047] The application of the heating surface structure specifically includes the bottom heating surface of the cooking pot, the reaction kettle, the batching tank, the mixing barrel, and the outer surface heating of the cylindrical barrel.

[0048] The application of the present invention is further described below in conjunction with specific embodiments:

[0049] Example 1

[0050] In the field of household and civilian food: edible salt is commonly used, and some foods also contain alkaloids, organic acids and other ingredients. Under the dual effects of high temperature and acid, alkali and salt corrosion, ordinary stainless steel will precipitate trace amounts of heavy metals to produce toxic substances (all types of stainless steel contain about 10% to 20% of heavy metals such as Cr, Ni, Cu, Zr, etc.). The concave-convex ball array heating surface of this embodiment is a titanium and aluminum composite material, and the surface in contact with food or materials is made of titanium, which not only eliminates the problem of heavy metal pollution but also improves heating efficiency. Specifically including:

[0051] A concave-convex ball array heating surface structure capable of increasing the heating rate;

[0052] The heating surface comprises an inner layer 1 and an outer layer 2, wherein the inner layer 1 is made of titanium and the outer layer 2 is made of a pure aluminum heat conducting plate;

[0053] The surface of the inner layer 1 in contact with the material is a titanium array-type concave-convex spherical structure, and the inner layer 1 adopts a high-temperature integrated die-casting process to produce a concave-convex spherical surface 3;

[0054] The bottom of the outer surface of the inner layer 1 is formed by a mold casting process, and aluminum liquid is poured at the bottom of the formed titanium heating container to form the outer layer 2. The inner layer 1 and the outer layer 2 are integrated by the bonding force and molecular force between the contact surfaces of the titanium and aluminum materials.

[0055] The aluminum layer of the outer layer 2 is also in the form of a convex surface, which is completely in contact with the concave-convex spherical surface 3 of the inner layer 1, forming a continuous heat conduction process.

[0056] The specific heat conduction process is as follows: the external heating module conducts heat to the pure aluminum heat conducting plate of the outer layer 2, and then the pure aluminum heat conducting plate outer layer 2 conducts heat to the pure titanium, titanium or stainless steel inner layer 1, and finally the heat is transferred to the heated material through the array-type concave-convex spherical surface 3.

[0057] The application fields of the heating surface structure include: electric rice cookers, steaming pots, and pressure cookers in the civilian field.

[0058] Example 2

[0059] In the commercial field: such as the decoction boiling and extract extraction heating kettle in the processing of traditional Chinese medicine in pharmaceutical companies, the cooking equipment used for the processing of traditional Chinese medicine decoctions in hospitals; and the cooking equipment and disinfection equipment used by various food processing companies; in the above application scenarios, if ordinary stainless steel or aluminum materials are used as heating containers, the alkaloids, organic acids and other components in traditional Chinese medicine or food will react with stainless steel or aluminum, and there will also be heavy metal pollution and the weakening of drug efficacy, ineffectiveness or harm to human health. The titanium-aluminum composite material concave-convex ball array heating surface of this embodiment is a better choice for making the heating container of the above equipment. Specifically including:

[0060] A concave-convex ball array heating surface structure capable of increasing the heating rate;

[0061] The heating surface comprises an inner layer 1 and an outer layer 2, wherein the inner layer 1 is made of titanium alloy and the outer layer 2 is made of a pure aluminum heat conducting plate;

[0062] The surface of the inner layer 1 in contact with the material is an array of concave-convex spheres of titanium alloy, and the inner layer 1 adopts a high-temperature integrated die-casting process to produce a concave-convex spherical surface 3;

[0063] The bottom of the outer surface of the inner layer 1 is formed by a mold casting process, and aluminum liquid is poured at the bottom of the formed titanium heating container to form the outer layer 2. The inner layer 1 and the outer layer 2 are integrated by the bonding force and molecular force between the contact surface of the titanium alloy and the aluminum material.

[0064] The aluminum layer of the outer layer 2 is also in the form of a convex surface, which is completely in contact with the concave-convex spherical surface 3 of the inner layer 1, forming a continuous heat conduction process.

[0065] The specific heat conduction process is as follows: the external heating module conducts heat to the pure aluminum heat conducting plate of the outer layer 2, and then the pure aluminum heat conducting plate outer layer 2 conducts heat to the pure titanium, titanium alloy or stainless steel inner layer 1, and finally the heat is transferred to the heated material through the array-type concave-convex spherical surface 3.

[0066] The application fields of the heating surface structure include Chinese medicine boiling kettles, extract preparation heating kettles, and sterilization pressure vessels in the commercial field.

[0067] Example 3

[0068] In the industrial field: When the corrosion intensity is general and the requirements for metal pollution are not strict, the stainless steel and aluminum composite material concave-convex ball array heating surface of this embodiment can be used, which meets the production conditions and has a relatively low cost. The titanium aluminum composite material concave-convex ball array heating surface structure of this embodiment is developed and designed for these working scenarios. Specifically including:

[0069] A concave-convex ball array heating surface structure capable of increasing the heating rate;

[0070] The heating surface comprises an inner layer 1 and an outer layer 2, wherein the inner layer 1 is made of stainless steel and the outer layer 2 is made of a pure aluminum heat conducting plate;

[0071] The inner layer 1 has an array-type concave-convex spherical structure of stainless steel on the surface in contact with the material, and the inner layer 1 adopts a high-temperature integrated die-casting process to produce a concave-convex spherical surface 3;

[0072] The bottom of the outer surface of the inner layer 1 is cast by a mold casting process. Molten aluminum is poured at the bottom of the formed stainless steel heating container to form the outer layer 2. The inner layer 1 and the outer layer 2 are connected as a whole by utilizing the bonding force and molecular force between the contact surfaces of the stainless steel and the aluminum material.

[0073] The aluminum layer of the outer layer 2 is also in the form of a convex surface, which is completely in contact with the concave-convex spherical surface 3 of the inner layer 1, forming a continuous heat conduction process.

[0074] The specific heat conduction process is as follows: the external heating module conducts heat to the pure aluminum heat conducting plate of the outer layer 2, and then the pure aluminum heat conducting plate outer layer 2 conducts heat to the pure titanium, titanium alloy or stainless steel inner layer 1, and finally the heat is transferred to the heated material through the array-type concave-convex spherical surface 3.

[0075] The application fields of the heating surface structure include reactors, batching tanks, and mixing tanks that need to be heated in the chemical, pharmaceutical, and smelting and purification industries in the industrial field.

[0076] The technical solution of Example 1 is adopted below, and further described in combination with specific application examples of Comparative Example 1, Comparative Example 2 and Reference Example:

[0077] Combination Figure 6-8 As shown, in comparative example 1, the inner pot of the electric pressure cooker with a diameter of 22 cm adopts a concave-convex ball structure; after adding the concave-convex spherical surface 3, the total heating surface area is 404 cm 2 The total heating surface area without adding the concave-convex spherical surface 3 is 371CM 2 , the total area increased by about 10%.

[0078] Combination Figure 9-11 As shown, in comparative example 2, the inner pot of the 38CM electric pressure cooker adopts a concave-convex ball structure; after adding the concave-convex spherical surface 3, the total heating surface area is 1139CM2, and the total heating surface area without adding the concave-convex spherical surface 3 is 919CM 2 , the total area increased by about 25%.

[0079] Combination Figure 12-14 As shown, the reference example is a 22CM electric pressure cooker inner pot with a smooth surface, and the contact area is reduced by about 9% compared with the convex surface of the comparative example 1.

[0080] By comparing comparative example 1, comparative example 2 and reference example, it can be concluded that the effect of adding convex surface to the heating surface increases proportionally with the increase of area. Therefore, the larger the area, the better the utilization effect of this structure. Figure 5 From the heat conduction analysis diagram, it can be seen that the overall heat conduction effect is good, which helps to improve the heating efficiency and achieve the effect of energy saving, environmental protection and health.

[0081] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A concave-convex ball array heating surface structure capable of increasing the heating rate, characterized in that: The heating surface comprises an inner layer (1) and an outer layer (2), wherein the inner layer (1) is made of pure titanium, titanium alloy or stainless steel, and the outer layer (2) is made of a metal heat conducting plate; The surface of the inner layer (1) in contact with the material is an array-type concave-convex spherical structure of pure titanium, titanium alloy or stainless steel, and the inner layer (1) is produced by a high-temperature integrated die-casting process to produce the concave-convex spherical surface (3); The bottom of the outer surface of the inner layer (1) is formed by a mold casting process, and a high thermal conductivity metal material is cast on the bottom of the already formed titanium or stainless steel heating container to form the outer layer (2). The inner layer (1) and the outer layer (2) are connected in an integrated manner by utilizing the bonding force and molecular force between the contact surface of titanium, titanium alloy or stainless steel and the high thermal conductivity metal material.

2. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 1, characterized in that: The stainless steel of the inner layer (1) is 304 stainless steel or 316 stainless steel.

3. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 1, characterized in that: The titanium alloy of the inner layer (1) is an α+β type titanium alloy.

4. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 1, characterized in that: The heat conducting plate of the outer layer (2) is made of pure aluminum or copper. The metal heat conducting plate of the outer layer (2) is also in the form of a convex surface that completely fits the concave-convex spherical surface (3) of the inner layer (1), thereby forming a continuous heat conduction process.

5. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 4, characterized in that: The heat conduction process is specifically as follows: the external heating module conducts heat to the metal heat conducting plate of the outer layer (2), and then the outer layer (2) of the metal heat conducting plate conducts heat to the inner layer (1) of pure titanium, titanium alloy or stainless steel, and finally the heat is transferred to the heated material through the array-type concave-convex spherical surface (3).

6. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 1, characterized in that: The application of the heating surface structure includes heating containers made of titanium, titanium alloy and stainless steel for heating liquid materials.

7. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 6, characterized in that: The application fields of the heating surface structure include: electric rice cookers, steamers, and pressure cookers in the civilian field; Chinese medicine boiling kettles, extract preparation heating kettles, and sterilization pressure vessels in the commercial field; and reaction kettles, batching tanks, and stirring tanks that need to be heated in the chemical, pharmaceutical, and smelting and purification industries in the industrial field.

8. The concave-convex ball array heating surface structure capable of improving the heating rate according to claim 6, characterized in that: The application of the heating surface structure specifically includes heating the bottom heating surface of a cooking pot, a reaction kettle, a batching tank, a mixing barrel, and the outer surface heating of a cylindrical barrel.

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