Steam generating device and cooking utensil

Abstract

The invention discloses a steam generating device and a cooking utensil, the steam generating device comprises a steam box and a steam pipe, a heating space is arranged in the steam box, a heating unit is arranged in the heating space, and the steam pipe comprises an inner pipe and an outer pipe which are communicated with each other; the inner pipe is located in the heating space and extends out of the heating space from the interior of the heating space to be communicated with the outer pipe, the outer pipe abuts against the outer wall of the steam box and extends along the outer wall of the steam box in a curve track in the opposite direction, the steam pipe further comprises an inlet pipe and an outlet pipe, the outlet pipe is communicated with the inner pipe, and the inlet pipe is communicated with the outlet pipe. The inlet pipe is communicated with the outer pipe; wherein in the working state, the temperature of the medium in the outer pipe is lower than that of the medium in the inner pipe. The steam generating device is simple in structure and small in size, and miniaturization of kitchen appliances can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of steam heating, and in particular to a steam generating device and a cooking appliance. Background Art

[0002] In the prior art, the high temperature steam evaporator of the cooking appliance using steam heating usually adopts a cast aluminum steam generator or directly uses an electric heating tube to heat water to generate steam. Although these traditional methods can achieve steam generation, they have significant shortcomings in practical applications.

[0003] The publication number is CN118293407A, and the invention name is a patent for a steam generator, an oven, and an oven control method. Steam is generated by a steam generator to cook food. Although this method of directly heating water with an electric heating tube is simple and direct, the overall heating efficiency is not high due to the loss in the heat transfer process and the energy dissipation in the steam generation process. This not only increases energy consumption, but also limits the application scope and use effect of the steam generator. In particular, the shell in the patent is generally made of cast aluminum to improve thermal conductivity. The melting point of aluminum is about 660°C, which means that the original performance of the material can be maintained when the temperature range of aluminum is below 200°C, but aluminum will soften, expand, oxidize, and a series of failure phenomena will occur at high temperatures. Due to the temperature resistance limit of aluminum materials, the method of directly heating steam generally does not exceed 200°C, and it is difficult to produce a sufficiently high steam temperature. The steam temperature in the pressure cooker generally does not exceed 130°C.

[0004] The patent with the publication number CN109393087A and the invention name of the patent is a highly efficient and energy-saving tea steam-killing machine, which is used for tea killing. The structure uses a furnace and a water tank to generate steam, and refrigerates through a cooling axial flow fan. The steam generated by the heat in the water tank is returned to the furnace through a steam pipe for secondary heating and then returns to the water tank to heat the water in the water tank to generate steam. The steam generated by such a steam heating method usually has a temperature equal to the boiling point of water under standard atmospheric pressure, that is, 100°C, and cannot generate high-temperature steam above 300°C. In addition, this structure is large in size and is not suitable for the application of small household appliances. In addition, this structure will generate large thermal radiation, causing thermal pollution to the surrounding environment.

[0005] The publication number is CN219199142U, and the invention name is a patent for a device for recovering and reusing excess steam from a hydrogen production device, which can generate high-temperature steam. In order to generate high-temperature steam, this steam generating device uses multiple partitions and an electric heating tube is provided at the bottom of each partition. However, the method of heating a large space of steam by an electric heating tube cannot generate high-temperature steam above 300°C. In addition, this structure also has the disadvantage of being large in size and can only be applied to industry, but not to household appliances. Especially today when small household appliances are increasingly pursuing compactness, integration, and miniaturization, this disadvantage is more prominent. Summary of the invention

[0006] In view of this, the present application provides a steam generating device and a cooking utensil, which have a simple structure and a small size and can be applied to small household cooking appliances to achieve miniaturization of household appliances.

[0007] In a first aspect, the present application provides a steam generating device, which includes a steam box and a steam pipe, wherein a heating space is provided in the steam box, a heating unit is provided in the heating space, the steam pipe includes an inner pipe and an outer pipe which are connected to each other, the inner pipe is located in the heating space and extends from the heating space to the outside of the heating space and is connected to the outer pipe, the outer pipe abuts against an outer wall of the steam box and extends in a curved trajectory in the opposite direction along the outer wall of the steam box, the steam pipe also includes an inlet pipe and an outlet pipe, the outlet pipe is connected to the inner pipe, and the inlet pipe is connected to the outer pipe; wherein, in a working state, a fluid medium is vaporized after flowing from the inlet pipe into the outer pipe and before entering the inner pipe, the vaporized medium flows out from the outlet pipe through the inner pipe, and the medium temperature in the outer pipe is lower than the medium temperature in the inner pipe.

[0008] By adopting the above technical solution, the unique connection structure and curved trajectory design of the inner and outer tubes and the steam box, and the secondary heating structure arranged with the steam pipe close to the outer wall of the steam box, the structure is compact, the product volume is greatly reduced, the space utilization efficiency and energy utilization efficiency are improved, and the needs of miniaturization of home appliances and fast cooking of ingredients with high-temperature steam are met.

[0009] In addition, the heating unit heats the air in the heating space at a high temperature, and the heat in the heating space is conducted and radiated outward through the outer wall of the steam box. The outer tube directly contacts the outer wall of the steam box, and can absorb the heat emitted by the steam box for heating, which can not only save energy, but also improve the heating efficiency and reduce heat radiation. During the steam generation process, water enters the outer tube from the inlet tube, and the water in the outer tube is heated into water vapor by the heat energy of the outer wall of the steam box. After the water vapor in the outer tube enters the inner tube, it is secondary heated by the heat energy in the heating space to become superheated water vapor above 300°C. After the temperature of the water vapor is further increased, it is discharged from the outlet pipe. Through the temperature difference between the inner and outer tubes, the step-by-step utilization and effective recovery of heat are realized, reducing energy consumption and waste heat emission. At the same time, this structure reduces the temperature radiated outward by the product, eliminates the supporting components for external cooling, and saves energy and reduces consumption. In the working state, the medium temperature in the outer tube is lower than the medium temperature in the inner tube. This temperature difference can make the outer tube act as a liquid-vapor buffer transition and a first-stage vaporization heating, and the multi-stage temperature gradient and liquid-vapor gradient make the steam flow smoother. The outer tube is vaporized in the first stage and then passes through the inner tube for efficient secondary heating of the medium, which improves the thermal efficiency of the overall system.

[0010] In some embodiments, the inner tube and the outer tube are an integrally formed structure or a split-formed structure, and the fluid medium is vaporized in the outer tube and then enters the inner tube for secondary heating, and the steam temperature in the outlet tube: the steam temperature in the outer tube is 3:1~5:1.

[0011] In some embodiments, the inner tube surrounds the heating unit from the outlet tube end and spirally extends along the length direction of the steam box away from the outlet tube.

[0012] In some embodiments, the outer tube spirally extends around the outer wall of the steam box toward the outlet tube and is connected to the inlet tube. The inlet tube and the outlet tube are located at the same end of the steam box.

[0013] By adopting the above technical solution, the inner tube is arranged around the heating unit starting from the end connected to the outlet tube, and the heating efficiency is improved through two-stage heating of the outer tube and the inner tube. This surrounding method ensures that the inner tube can be as close to the heating unit as possible, so as to absorb heat more effectively. At the same time, the surrounding layout also helps to reduce the loss of heat during the transmission process and improve thermal efficiency. The spiral extension design not only saves space, but also increases the heating volume, and also allows the medium in the inner tube to be continuously heated during the flow process, ensuring the uniformity and stability of the medium temperature. In addition, the spiral shape also helps to reduce the resistance and pressure loss during the flow of the medium and improve the overall efficiency of the system. The outer tube is arranged close to the outer wall of the steam box and surrounds along its outer wall. This steam pipe design enables the outer tube to make full use of the heat of the outer wall of the steam box, fully preheat and further heat exchange before entering the inner tube for secondary heating and heating, and can realize the convenience of connection of the inlet pipe and the outlet pipe at the same end. This has been significantly improved in terms of heat transfer efficiency, system stability, space utilization and flexibility.

[0014] In some embodiments, the steam box is provided with a first outlet, and one end of the inner tube away from the outlet tube passes through the heating space from the first outlet and is connected to the outer tube.

[0015] In some embodiments, the steam box is provided with a second outlet, the outlet pipe passes through the steam box from the second outlet, and the temperature of the medium discharged from the outlet pipe is not less than 300°C.

[0016] By adopting the above technical solution, adding a first outlet and a second outlet, and adjusting the connection method between the inner tube and these outlets, it is convenient for the inner tube to pass through the steam box and connect to the outside, reducing the risk of heat leakage in the steam box and improving the safety and maintainability of the connection.

[0017] In some embodiments, a heat preservation box is further provided outside the steam box, the steam box and the outer tube are both located inside the heat preservation box, and the outer tube is located inside an inner insulation cavity between the steam box and the heat preservation box.

[0018] By adopting the above technical solution, the main function of the insulation box is to reduce the heat exchange between the steam box and the steam pipe and the external environment. By wrapping the steam box and the outer pipe in the insulation box, the heat loss can be significantly reduced, the heat transfer efficiency can be improved, and the temperature stability during the heating process can be ensured. The insulation box can also help reduce the noise and vibration generated during the heating process and improve the smooth operation of the equipment. The design of the inner insulation cavity between the insulation box and the steam box reduces the heat loss, making the heating process in the steam box more efficient, while also improving the effect of preheating or heat exchange of the outer pipe. Reducing heat loss not only improves the heat transfer efficiency, but also reduces energy consumption, which is more energy-saving and environmentally friendly.

[0019] In some embodiments, the insulated box is provided with a third outlet and a fourth outlet, the outlet pipe passes through the insulated box from the third outlet, and the inlet pipe passes through the insulated box from the fourth outlet. An outer shell is also provided outside the insulated box, and an external insulation cavity is formed between the outer shell and the insulated box.

[0020] By adopting the above technical solution, the design of the third outlet and the fourth outlet makes the connection between the cooking appliance and the external system or equipment more flexible and convenient. The user can adjust the position and direction of the outlet pipe and the inlet pipe according to actual needs to adapt to different application scenarios. The outer insulation cavity can further reduce heat loss.

[0021] In some embodiments, the heating unit is a carbon fiber heating tube, which spirally extends along the length direction of the steam box, and both ends of the carbon fiber heating tube pass through the steam box.

[0022] By adopting the above technical solution, the carbon fiber heating tube has the characteristics of fast heating, high efficiency, long life and corrosion resistance, and is very suitable for occasions requiring high temperature heating. The carbon fiber heating tube extends spirally along the length direction of the steam box. This design helps to increase the surface area of ​​the heating tube, improve the heat radiation efficiency, and ensure that the medium in the steam box can be evenly heated. Both ends of the carbon fiber heating tube pass through the steam box, which is convenient for connection with an external power supply and control system. At the same time, it is also convenient for the installation, maintenance and replacement of the heating tube. Carbon fiber materials have good high temperature resistance, oxidation resistance and corrosion resistance, so the service life of the carbon fiber heating tube is relatively long, which can reduce the replacement frequency and maintenance cost. The fast heating and high efficiency characteristics of the carbon fiber heating tube enable the medium in the steam box to quickly reach a higher temperature, thereby improving the heating efficiency. The design of the carbon fiber heating tube extending spirally along the length direction of the steam box ensures that the medium in the steam box can be evenly heated, avoiding the problem of uneven steam temperature in the inner tube.

[0023] In a second aspect, the present application provides a cooking appliance comprising the steam generating device described in the first aspect.

[0024] Since cooking utensils integrate efficient steam generation devices, they have a wide range of applications. For example, in the food processing industry, cooking utensils can be used for processes such as steaming, drying, and sterilization. In the medical industry, they can be used for disinfection and sterilization of medical devices. In the chemical industry, they can be used for processes such as heating and distillation of chemical reactions. In addition, cooking utensils can also be used in a variety of occasions such as household cleaning and ironing clothes.

[0025] In summary, the present application has at least one of the following beneficial technical effects: 1. The unique steam box and steam pipe combination structure of the present application not only improves the thermal efficiency, but also optimizes the heat transfer path, ensuring the safety and efficiency of the equipment during the heating process.

[0026] 2. By optimizing the heat transfer path and medium flow pattern, it helps to reduce the temperature and pressure fluctuations inside the system and improve the stability and reliability of the system.

[0027] 3. The cooking appliance provided by this application integrates an efficient steam generator and other necessary components to form a comprehensive device with complete functions and convenient operation. This device not only has the advantages of high efficiency and energy saving, safety and reliability, and convenient operation, but also has a wide range of application fields and market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the appearance structure of the first embodiment of the steam generating device of the present application; Figure 2 is a structural schematic diagram of the first embodiment of the steam generating device of the present application from another angle; Figure 3 is a three-dimensional cross-sectional schematic diagram of a first embodiment of the steam generating device of the present application; Figure 4 It is a schematic diagram of the shape and position structure of the steam pipe and the heating unit of the first embodiment of the steam generating device of the present application; Figure 5 It is a schematic diagram from another angle of the shape and position structure of the steam pipe and the heating unit of the first embodiment of the steam generating device of the present application; Figure 6 It is a schematic diagram of the structure of the steam pipe; Figure 7 is a schematic diagram of the structure of the heating unit; Figure 8 is a schematic diagram of the appearance structure of the second embodiment of the steam generating device of the present application; Fig. 9 is a three-dimensional cross-sectional schematic diagram of a second embodiment of the steam generating device of the present application; Fig.10 is a structural schematic diagram of the second embodiment of the steam generating device of the present application with the outer shell opened; Fig.11 It is a schematic diagram of the internal structure of the second embodiment of the steam generating device of the present application.

[0029] Description of reference numerals: 1. Steam box; 11. Second outlet; 12. Outer wall; 13. First outlet; 14. Heating space; 15. First heating outlet; 2. Steam pipe; 21. Outer pipe; 22. Outlet pipe; 23. Inlet pipe; 24. Inner pipe; 3. Heating unit; 31. Connecting end; 32. Heating section; 4. Outer shell; 41. External outlet; 42. External insulation cavity; 43. Second heating outlet; 5. Insulation box; 51. Fourth outlet; 52. Internal insulation cavity; 53. Third outlet. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various configurations. 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.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0034] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0035] Embodiment 1:

[0036] See also Figure 1-Figure 7A steam generating device provided in an embodiment of the present application includes a steam box 1 and a steam pipe 2. A heating space 14 is provided in the steam box 1. A heating unit 3 is provided in the heating space 14. The steam pipe 2 includes an inner pipe 24 and an outer pipe 21 which are connected to each other. The inner pipe 24 is located in the heating space 14 and extends from the heating space 14 to the outside of the heating space 14 and is connected to the outer pipe 21. The outer pipe 21 abuts against the outer wall 12 of the steam box 1 and extends in a curved trajectory in the opposite direction along the outer wall 12 of the steam box 1. The steam pipe 2 also includes an inlet pipe 23 and an outlet pipe 22. The outlet pipe 22 is connected to the inner pipe 24, and the inlet pipe 23 is connected to the outer pipe 21. In the working state, the temperature of the medium in the outer pipe 21 is lower than the temperature of the medium in the inner pipe 24. During the steam generation process, water enters the outer pipe 21 from the inlet pipe 23, and the water in the outer pipe 21 is heated to steam by the heat energy of the outer wall 12 of the steam box 1. Then, the water vapor in the outer tube 21 enters the inner tube 24 and is heated again by the heat energy in the heating space 14. The temperature of the water vapor is further increased and then discharged from the outlet pipe 22. The temperature of the medium discharged from the outlet pipe 22 is not less than 300°C. Through the temperature difference between the heating space 14, the outer wall 12, and the inner and outer tubes 21, the step-by-step utilization and effective recovery of heat are achieved, reducing energy consumption and waste heat emissions. This temperature difference allows the outer tube 21 to serve as a liquid-vapor buffer transition and a first-stage vaporization heating. The multi-stage temperature gradient and liquid-vapor gradient make the steam flow smoother.

[0037] See also Figure 1 Specifically, the steam generating device includes a heating unit 3, and the heating unit 3 can be a carbon fiber heating tube, a resistance wire heating tube, etc. The carbon fiber heating tube extends spirally along the length direction of the steam box 1, and both ends of the carbon fiber heating tube pass through the steam box 1. The rotation direction of the carbon fiber heating tube is the same as or opposite to the rotation direction of the inner tube 24, which can ensure uniform heating effect and high energy utilization. The heating unit 3 adopts the advantage of the carbon fiber heating tube, and the carbon fiber has high thermal efficiency and long service life. The resistance wire heating tube can also be used for heating, which is characterized by low cost but relatively short life. The material of the heating unit 3 can be a material with good thermal conductivity such as carbon fiber, alloy wire, etc. In this embodiment, the heating unit 3 adopts a carbon fiber heating tube.

[0038] See also Figure 2 and Figure 3The steam pipe 2 includes an inner pipe 24 and an outer pipe 21. The inner pipe 24 and the outer pipe 21 can be an integrally formed structure, or they can be separately formed and then connected as a whole by welding or other fixed connection methods. The integrally formed structure can improve the overall strength and sealing performance of the steam pipe 2, and the separately formed structure has low cost and is easy to disassemble and maintain. The inner pipe 24 surrounds the heating unit 3 from the end of the outlet pipe 22 and spirally extends along the length direction of the steam box 1 away from the outlet pipe 22, and passes through the heating space 14 from the first outlet 13 of the steam box 1 to connect with the outer pipe 21. The outer pipe 21 surrounds and closely adheres to the outer wall 12 of the steam box 1 and spirally extends in the direction of the outlet pipe 22 and is connected to the inlet pipe 23. The rotation direction of the outer pipe 21 is the same as or opposite to that of the inner pipe 24, and the inlet pipe 23 and the outlet pipe 22 are located at the same end of the steam box 1. In this embodiment, the rotation direction of the outer tube 21 is the same as that of the inner tube 24. With such a design, the process is simple and the temperature of the heating space 14 and the inner tube 24 can be directly radiated to the outer wall 12 to which the outer tube 21 is attached, so that the heat of the outer wall 12 of the steam box 1 can be fully utilized for sufficient preheating and further heat exchange. The material of the outer tube 21 can be a material with good thermal conductivity such as stainless steel and copper tube. The material can be appropriately selected according to the specific use environment and cost considerations.

[0039] The outer tube 21 abuts against the outer wall 12 of the steam box 1, and extends along the outer wall 12 of the steam box 1 in a curved trajectory in the opposite direction to the extension direction of the inner tube 24. Spherical graphite or thermal insulation material is provided between the outer tube 21 and the outer wall 12 of the steam box 1 to fill the gap, so that the outer tube 21 can obtain a more uniform heat distribution. The curved trajectory of the outer tube 21 can be manufactured by a bending mold to ensure good contact between the outer tube 21 and the outer wall 12 of the steam box 1. The inner wall of the outer tube 21 is provided with a threaded structure or a corrugated structure to increase the heat exchange area in the outer tube 21 and improve the heat exchange efficiency. The inner tube 24 can also be provided with a similar inner wall structure to further enhance the heat exchange effect of water vapor. The threaded or corrugated structures of the inner walls of the outer tube 21 and the inner walls of the inner tube 24 can be manufactured by machining or mold forming to ensure the stability of the structure and the heat exchange effect.

[0040] See also Figure 4-Figure 6 In this embodiment, the rotation direction of the outer tube 21 is the same as that of the inner tube 24, and the outer tube 21 spirally extends in the opposite direction of the spiral extension of the inner tube 24, so that the outlet tube 22 and the inlet tube 23 are located at the same end. This design makes the processing technology of the inner tube 24 and the outer tube 21 better, the yield rate is high, the connection between the inner tube 24 and the outer tube 21 is smooth, and the fluid resistance is small. In addition, in the spatial trajectory, the inner tube 24 and the outer tube 21 have multiple intersections on the axial section, which facilitates the heat of the inner tube 24 and the heating space 14 to radiate to the outer wall 12 abutting the outer tube 21 at the closest distance, and the efficiency of one-time heating is high.

[0041] See also Figure 5 and Figure 7 The connecting ends 31 at both ends of the heating unit 3 extend in opposite directions along the same axis, and the middle heating section 32 extends in a spiral shape. The spiral direction of the heating section 32 can be the same as or opposite to the spiral direction of the inner tube 24. The spiral direction of the heating section 32 in this embodiment is opposite to the spiral direction of the inner tube 24. In the spatial trajectory, the heating section 32 of the heating unit 3 and the inner tube 24 have multiple intersections on the axial section. The temperature at the intersection is high, which is convenient for the heating section 32 to heat the surrounding air and form multiple heating zones with different temperatures for the inner tube 24. The temperature difference is used as the driving force for heat transfer. By heating at different temperature sections, a temperature gradient is generated inside the fluid, thereby accelerating the heat transfer and the heat exchange process of the fluid.

[0042] The implementation principle of this embodiment is: the steam pipe 2 is divided into two parts, the outer pipe 21 is used as the preheating section 32 and the buffer zone, and the inner pipe 24 is used as the main heating section 32 to achieve the step-by-step utilization of heat. The first-level heating space 14 of the outer wall 12 of the steam box 1 can fully preheat the liquid in the outer pipe 21 to form steam and reduce the waste of heat source. The inner pipe 24 is arranged in the heating space 14, so that the heat of the heating unit 3 can be more evenly transferred to the water vapor in the inner pipe 24, thereby improving the energy utilization efficiency. At the same time, the temperature difference between the inner and outer pipes 21 makes the steam flow smoother and ensures the quality of the steam. By adopting carbon fiber heating pipes and steam pipes 2 of different materials, the overall performance and reliability of the steam generating device are further enhanced. This design not only improves the energy utilization efficiency of the steam generating device, but also overcomes the shortcomings of the existing device, and has a high practical value.

[0043] Water of different flow rates was introduced through the inlet pipe for testing. The relevant data are as follows:

[0044] It can be seen from the test results in Table 1 that the steam temperature of the outlet pipe 22 can reach more than 400 degrees, which greatly improves the efficiency and temperature of steam generation. At the same time, the temperature radiated outward from the heating space 14 is absorbed by the outer pipe 21, and then through the insulation of the inner insulation cavity 52 and the outer insulation cavity 42, the risk of high temperature scalding of the product is greatly reduced.

[0045] Embodiment 2:

[0046] The difference between the steam generating device of this embodiment and the embodiment 1 is that the design of the heating unit 3 is further optimized, and the heating unit 3 of different materials and structures is adopted.

[0047] Specifically, the heating unit 3 can adopt other types of heating tubes, such as resistance wire heating tubes, silicon carbide heating tubes, etc. Resistance wire heating tubes have low cost and are suitable for the low-end market. Silicon carbide heating tubes have high high temperature resistance and are suitable for steam generating devices under high temperature environments. The heating unit 3 can be made of different materials, such as metal wires, ceramic heating tubes, etc., each material has different thermal conductivity and durability. Carbon fiber heating tubes have good thermal conductivity and long service life, and are suitable for use in steam generating devices for long-term use. Resistance wire heating tubes have low cost, but relatively short service life, and are suitable for short-term use or frequent replacement. The material of the heating unit 3 can be appropriately selected according to the specific use environment and cost considerations.

[0048] The heating unit 3 can be designed as a spiral heating tube structure that extends in a spiral manner, and the inner tube 24 is located at the center of the spiral heating tube so that the liquid in the inner tube 24 can be fully vaporized and reach a sufficiently high temperature. The inner tube 24 can also be designed to extend around the outer circumference of the spiral heating tube, which can increase the storage capacity of the liquid in the inner tube 24 and improve the steam generation. Both designs can be selected and applied as needed.

[0049] The implementation principle of this embodiment is: by optimizing the design of the heating unit 3 and selecting heating units 3 of different materials and structures, selection can be made according to different usage scenarios and needs, thereby improving the application range and service life of the steam generating device.

[0050] Embodiment 3:

[0051] The difference between the steam generating device of this embodiment and the above-mentioned embodiments is that the design of the steam pipe 2 is further optimized, and a structure of different shape and material is adopted.

[0052] Specifically, the design of the optimized steam pipe 2 can adopt different shapes and materials. The steam pipe 2 can be made of stainless steel, copper pipe or other materials with good thermal conductivity. In addition to the spiral design, various combinations such as straight pipes and U-shaped pipes can also be used to adapt to different application scenarios. The inner wall of the outer tube 21 is provided with a threaded structure or a corrugated structure to increase the heat exchange area in the outer tube 21 and improve the heat exchange efficiency. The inner tube 24 can also be provided with a similar inner wall structure to further enhance the heat exchange effect of water vapor. The threaded or corrugated structure of the inner wall and the inner wall of the outer tube 21 can be manufactured by machining or mold forming to ensure the stability of the structure and the heat exchange effect.

[0053] The implementation principle of this embodiment is: by optimizing the design of the steam pipe 2 and adopting different shapes and materials, it can be adjusted according to different functional requirements. This not only enhances the flexibility and application range of the steam generating device, but also improves the heat exchange efficiency and service life of the equipment.

[0054] Embodiment 4:

[0055] See also Figure 8-Figure 11 The difference between the steam generating device of this embodiment and the above-mentioned embodiment is that the structure of the steam box 1 is further expanded, and the design of the heat preservation box 5 is introduced to improve the heat preservation effect of the whole device.

[0056] Specifically, an insulation box 5 is provided outside the steam box 1, and the steam box 1 and the outer tube 21 are both located inside the insulation box 5, and the outer tube 21 is located between the steam box 1 and the insulation box 5. The inner insulation cavity 52 between the insulation box 5 and the steam box 1 forms a first-level heating space 14, and the heating space 14 inside the steam box 1 is a second-level heating space 14. An outer shell 4 is provided outside the insulation box 5, and the insulation box 5 is located inside the outer shell 4. The outer shell 4 and the insulation box 5 are insulated by air or insulation material. The insulation box 5 is provided with a third outlet 53 and a fourth outlet 51. The outlet pipe 22 passes through the third outlet 53 of the insulation box 5, and the inlet pipe 23 passes through the fourth outlet 51 of the insulation box 5. The third outlet 53 and the fourth outlet 51 can be sealed. This design significantly improves the insulation effect of the entire device and reduces heat loss. The insulation box 5 is also provided with a first heating outlet 15, and the heating unit 3 extends out of the insulation box 5 from the first heating outlet 15.

[0057] The insulation box 5 can be made of a material with a low thermal conductivity coefficient to ensure the insulation effect of the insulation box 5 to prevent heat loss. The gap between the outer tube 21 and the steam box 1 can be filled with heat-conducting materials, such as graphene, insulation cotton, porous ceramics, etc., to enhance the heat transfer effect. The choice of the material of the insulation box 5 can be appropriately selected according to the specific use environment and cost considerations. The insulation box 5 can adopt an integrated design to ensure the sealing and insulation effect of the entire device. The insulation material can be a cavity or a filler, for example, glass fiber or aluminum silicate wool is used to further enhance the insulation effect.

[0058] An outer heat insulation cavity 42 is formed between the shell 4 and the heat preservation box 5, and the outer heat insulation cavity 42 can further insulate the heat preservation box 5 to reduce heat loss. The shell 4 is provided with a second heating outlet 43 and two outer ports 41 located at the same end, and the two outer ports 41 correspond to the outlet pipe 22 and the inlet pipe 23 one by one. The heating unit 3 extends out of the shell 4 from the second heating outlet, and the outlet pipe 22 and the inlet pipe 23 extend out of the shell 4 from one side end of the shell 4 through the corresponding outer ports 41.

[0059] The implementation principle of this embodiment is as follows: by introducing the design of the heat preservation box 5, the effect of the multi-stage heating space 14 is achieved. The first stage heating space 14 is used for preheating and preliminary steam generation, and the second stage heating space 14 is used to further increase the steam temperature. The arrangement between the heat preservation box 5 and the shell 4 further reduces the heat loss and improves the thermal efficiency of the overall device. This design not only improves the energy utilization efficiency of the steam generating device, but also ensures the steam quality, and has a high practical value.

[0060] Embodiment 5:

[0061] This embodiment discloses a cooking appliance, including any one of the steam generating devices in the above embodiments. Referring to the above figures, the working process of the cooking appliance in this embodiment is as follows: The heating unit 3 is powered on to heat the heating space 14, and the heat in the heating space 14 is radiated to the outer wall 12, and the temperature of the outer wall 12 increases; Water enters the outer tube 21 from the inlet pipe 23, and the temperature of the outer wall 12 is transmitted to the outer tube 21 to heat the water in the outer tube 21 into water vapor; The water vapor enters the inner tube 24 along the outer tube 21, and the high temperature in the heating space 14 performs secondary heating on the water vapor in the inner tube 24; The water vapor in the inner tube 24 is discharged through the outlet tube 22 and enters the cooking area of ​​the cooking device, and the high-temperature water vapor heats the cooking area.

[0062] The cooking utensils of this embodiment have a wide range of applications. For example, in the food processing industry, such as high-temperature steamers, electric steamers and other cooking utensils, the cooking utensils can be used for steaming and cooking. High-temperature steam is quickly generated by the two-stage vaporization of the steam generating device, and the steam is guided from the outlet pipe 22 to the food to be cooked, and the food is quickly heated to achieve the functional effects of fast cooking and fresh-keeping and fishy removal. Cooking with high-temperature steam can better maintain the shape, nutrition and moisture of the raw materials, while making the dishes soft, tender, fat and glutinous, quick to taste, and beautiful in shape and color. It can also cleverly force out the fat and salt inside the ingredients, making the baked dishes lower in salt and fat, meeting the needs of modern people in pursuit of healthy diets.

[0063] In order to improve the adaptability of the cooking appliance to different ingredients in cooking scenarios, the cooking appliance of this embodiment is also provided with different program control modules, through which the steam temperature and steam discharge volume can be adjusted and controlled.

[0064] The basic principle, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes, modifications, substitutions and variants, which all fall within the scope of the present invention claimed.

Claims

1. A steam generating device, characterized in that: The invention comprises a steam box and a steam pipe, wherein a heating space is provided in the steam box, wherein a heating unit is provided in the heating space, wherein the steam pipe comprises an inner pipe and an outer pipe which are connected to each other, wherein the inner pipe is located in the heating space and extends from the heating space to the outside of the heating space and is connected to the outer pipe, wherein the outer pipe abuts against the outer wall of the steam box and extends in a curved trajectory in the opposite direction along the outer wall of the steam box, wherein the steam pipe further comprises an inlet pipe and an outlet pipe, wherein the outlet pipe is connected to the inner pipe, and the inlet pipe is connected to the outer pipe; wherein, in a working state, a fluid medium flows from the inlet pipe into the outer pipe and is vaporized, and the vaporized medium flows out from the outlet pipe through the inner pipe, and the medium temperature in the outer pipe is lower than the medium temperature in the inner pipe.

2. The steam generating device according to claim 1, characterized in that: The inner tube and the outer tube are an integrally formed structure or a separately formed structure, and the fluid medium is vaporized in the outer tube and then enters the inner tube for secondary heating.

3. The steam generating device according to claim 1 or 2, characterized in that: The inner tube surrounds the heating unit from the outlet tube end and spirally extends along the length direction of the steam box away from the outlet tube.

4. The steam generating device according to claim 1 or 2, characterized in that: The outer tube surrounds the outer wall of the steam box, spirally extends toward the outlet tube, and is connected to the inlet tube. The inlet tube and the outlet tube are located at the same end of the steam box.

5. The steam generating device according to claim 3, characterized in that: The steam box is provided with a first outlet, and one end of the inner tube away from the outlet tube passes through the heating space from the first outlet and is connected to the outer tube.

6. The steam generating device according to claim 1, characterized in that: The steam box is provided with a second outlet, and the outlet pipe passes through the steam box from the second outlet. The temperature of the medium discharged from the outlet pipe is not lower than 300°C.

7. The steam generating device according to claim 1, characterized in that: A heat preservation box is also arranged outside the steam box, the steam box and the outer tube are both located inside the heat preservation box, and the outer tube is located inside an inner heat insulation cavity between the steam box and the heat preservation box.

8. The steam generating device according to claim 7, characterized in that: The insulation box is provided with a third outlet and a fourth outlet, the outlet pipe passes through the insulation box from the third outlet, and the inlet pipe passes through the insulation box from the fourth outlet. An outer shell is also provided outside the insulation box, and an outer insulation cavity is formed between the outer shell and the insulation box.

9. The steam generating device according to claim 1, characterized in that: The heating unit is a carbon fiber heating tube, which spirally extends along the length direction of the steam box, and both ends of the carbon fiber heating tube pass through the steam box.

10. A heating device, characterized in that: It comprises a steam generating device as described in any one of claims 1 to 9.

Images