Steam generator and cooking apparatus having the same

Abstract

The utility model discloses a steam generator and cooking equipment with same, steam generator includes: fluid pipe, heating pipe and heat conduction spare, fluid pipe has at least one circle fluid elbow, fluid pipe has the import section and export section with fluid elbow intercommunication, heating pipe has at least one circle heating elbow, one of fluid elbow and heating elbow is located the radial inboard of another, and heating elbow and fluid elbow between have heat conduction gap, in the radial direction of heating pipe, the minimum value of heat conduction gap's range of values is 3 8mm, and at least one part of heat conduction spare is filled in heat conduction gap. Fluid elbow can make fluid produce dean vortex when flowing, to this enhancement fluid and high temperature pipe wall's heat exchange capacity, and through the control heat conduction gap between heating elbow and fluid elbow, can reduce the temperature of the pipe wall of fluid elbow while narrowing the heat transfer path, and the condition of film boiling is caused by temperature too high is reduced, and heat transfer efficiency is improved, and the steam generation efficiency of steam generator can be improved.

Description

Technical Field

[0001] This utility model relates to the field of cooking equipment technology, and in particular to a steam generator and a cooking device having the same. Background Technology

[0002] Steam generators can be used in cooking appliances, such as steam ovens or baking machines, to produce steam for cooking food. However, the power of these steam generators is relatively low, and they cannot meet the cooking needs when applied to large-capacity cooking appliances, such as large-capacity steam ovens, indicating room for improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a steam generator with high steam generation efficiency, which can meet the requirements of high-power applications.

[0004] This utility model also proposes a cooking device having the above-mentioned steam generator.

[0005] A steam generator according to a first aspect of the present invention comprises: a fluid pipe having at least one fluid bend, the fluid pipe having an inlet section and an outlet section communicating with the fluid bend; a heating pipe having at least one heating bend, one of the fluid bend and the heating bend being located radially inside the other; a thermally conductive gap being formed between the heating bend and the fluid bend, the minimum value of the thermally conductive gap being 3-8 mm in the radial direction of the heating pipe; and a heat-conducting element, at least a portion of which fills the thermally conductive gap.

[0006] According to the steam generator of this utility model embodiment, the fluid pipe has a fluid bend that enables the fluid to generate Dean's vortex when flowing inside the fluid bend, increasing the amount of fluid in contact with the pipe wall, thereby enhancing the heat exchange capacity between the fluid and the high-temperature pipe wall, thus improving the heating effect of the fluid; and by controlling the thermally conductive gap between the heating bend and the fluid bend, the heat transfer path between the heating bend and the fluid bend can be reduced, while reducing the possibility of film boiling caused by excessively high pipe wall temperature in the fluid bend, thereby improving the heat transfer efficiency and thus improving the steam generation efficiency of the steam generator.

[0007] In some embodiments, the heating bend is located radially inside the fluid bend, and the ratio of the radius of the heating bend to the radius of the fluid bend ranges from 2 / 3 to 3 / 4.

[0008] In some embodiments, the radius of the heating bend is in the range of 20-40 mm, and the radius of the fluid bend is in the range of 30-60 mm.

[0009] In some embodiments, the ratio of the diameter of the heating tube to the radius of the heating bend ranges from 1 / 4 to 4 / 15.

[0010] In some embodiments, the diameter of the heating tube is in the range of 5-10 mm, and the radius of the heating bend is in the range of 20-40 mm.

[0011] In some embodiments, the ratio of the diameter of the fluid pipe to the radius of the fluid bend ranges from 1 / 5 to 1 / 2.

[0012] In some embodiments, the diameter of the fluid pipe is in the range of 6-12 mm, and the radius of the fluid bend is in the range of 30-60 mm.

[0013] In some embodiments, the fluid tube has multiple turns of the fluid bend, which are arranged in a spiral pattern; the heating tube has multiple turns of the heating bend, which are arranged in a spiral pattern.

[0014] In some embodiments, the number of turns of the fluid bend is n1, and the number of turns of the heating bend is n2, where n1 = n2.

[0015] In some embodiments, the number of turns n1 of the multiple fluid bends ranges from 1 to 4, and the number of turns n2 of the multiple heating bends ranges from 1 to 4.

[0016] In some embodiments, the heat-conducting element at least completely encloses the fluid bend and the heating bend.

[0017] In some embodiments, the heat-conducting component is a die-cast aluminum housing.

[0018] In some embodiments, the steam generator further includes a mounting bracket disposed on the heat-conducting element.

[0019] The cooking device according to the second aspect of the present invention includes: a housing, wherein a cooking chamber is provided inside the housing; and a steam generator, wherein the steam generator is the same as the steam generator according to the first aspect of the present invention, the steam generator is disposed in the housing, and the outlet section is connected to the cooking chamber.

[0020] According to the cooking equipment of the present invention, by setting the steam generator of the first aspect of the present invention, the steam generator has a high steam generation efficiency, which can meet the needs of large-capacity cooking equipment.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] 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:

[0023] Figure 1 This is a schematic diagram of the structure of a steam generator according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the fluid tube and heating tube according to an embodiment of the present utility model;

[0025] Figure 3 This is a cross-sectional view of the fluid bend and the heating bend according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of a cooking device according to an embodiment of the present utility model;

[0027] Figure 5 This is a rear view of the cooking apparatus according to an embodiment of the present utility model;

[0028] Figure 6 This is a diagram showing the steam thermal efficiency and steam dryness of a steam generator according to an embodiment of the present invention.

[0029] Figure label:

[0030] 1000 cooking equipment;

[0031] Steam generator 100; thermally conductive gap 10a;

[0032] Fluid pipe 1; Fluid bend 11; Inlet section 12; Outlet section 13;

[0033] Heating tube 2; heating bend 21;

[0034] Heat-conducting component 3;

[0035] Mounting bracket 4;

[0036] Box body 200; cooking chamber 201. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, it should be understood that the terms "center," "inner," "outer," "radial," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following is for reference. Figures 1-3 A steam generator 100 according to an embodiment of the present invention is described.

[0041] like Figure 1 and Figure 2 As shown, the steam generator 100 according to the first aspect of the present invention includes: a fluid pipe 1, a heating pipe 2, and a heat-conducting element 3. The fluid pipe 1 has at least one fluid bend 11 and has an inlet section 12 and an outlet section 13 communicating with the fluid bend 11. The heating pipe 2 has at least one heating bend 21, and one of the fluid bend 11 and the heating bend 21 is located radially inside the other. A heat-conducting gap 10a is provided between the heating bend 21 and the fluid bend 11. In the radial direction of the heating pipe 2, the minimum value C of the heat-conducting gap 10a ranges from 3 to 8 mm. At least a portion of the heat-conducting element 3 fills the heat-conducting gap 10a.

[0042] Fluid flows inside fluid tube 1, and heating tube 2 is used to heat the fluid inside fluid tube 1, causing the fluid inside fluid tube 1 to undergo a phase change and produce steam. It is worth noting that the fluid inside fluid tube 1 undergoes a phase change, so the fluid flowing inside fluid tube 1 can be in a liquid state, a gas state, or a gas-liquid mixture state.

[0043] For example, liquid water is supplied to fluid pipe 1, and the water is heated into water vapor by heating pipe 2 inside fluid pipe 1, thereby generating water vapor. Steam generator 100 can be used for food cooking. Of course, it is not limited to this. For example, liquid ethanol is supplied to fluid pipe 1, and the ethanol is heated into ethanol vapor inside fluid pipe 1 by heating pipe 2, thereby generating ethanol vapor. Steam generator 100 can be used for cleaning or food processing, and so on.

[0044] The fluid pipe 1 has at least one fluid bend 11, and at least a portion of the fluid pipe 1 is constructed in a ring shape. Compared to a straight fluid pipe, the fluid pipe 1 with a ring structure occupies less space and is easier to arrange. The fluid pipe 1 has an inlet section 12 and an outlet section 13 that communicate with the fluid bend 11. Liquid fluid flows in from the inlet section 12 and then into the fluid bend 11. After being heated and undergoing a phase change, gaseous fluid flows out from the outlet section 13.

[0045] The heating tube 2 also has at least one heating bend 21, which cooperates with the fluid bend 11. The fluid bend 11 can be located radially inside the heating bend 21, heating the fluid inside the inner fluid bend 11; alternatively, the heating bend 21 can be located radially inside the fluid bend 11, heating the fluid inside the outer fluid bend 11. By involving the heating tube 2 in cooperation with the heating bend 21 and the fluid bend 11, the degree of cooperation between the heating bend 21 and the fluid bend 11 can be improved, which helps to reduce the heat transfer distance and improves the heating effect of the heating tube 2 on the fluid tube 1.

[0046] A thermally conductive gap 10a is provided between the heating bend 21 and the fluid bend 11. At least a portion of the heat-conducting element 3 fills the thermally conductive gap 10a. The heating bend 21 transfers heat to the fluid bend 11 through the heat-conducting element 3, thereby heating the fluid flowing through the fluid pipe 1. Compared to heat transfer through air, filling the thermally conductive gap 10a with the heat-conducting element 3 can improve the heat transfer efficiency between the heating pipe 2 and the fluid bend 11.

[0047] It is understandable that the fluid closer to the pipe wall has a better heating effect. The fluid bend 11 structure of the fluid pipe 1 in this embodiment of the present invention can generate Dean vortices when the fluid flows in the fluid bend 11, so that the flow trajectory of the fluid is spiral, which disturbs the fluid close to the pipe wall of the fluid bend 11, increases the amount of fluid in contact with the pipe wall, thereby enhancing the heat exchange capacity between the fluid and the high temperature pipe wall, thereby improving the heating effect of the fluid and improving the steam generation efficiency.

[0048] The size of the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 also affects the steam generation efficiency. When the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 is too small, the temperature of the pipe wall of the fluid bend 11 near the heating bend 21 is too high. The fluid in the fluid bend 11 near the pipe wall of the heating bend 21 sublimates rapidly, forming a continuous vapor film that separates the liquid fluid from the pipe wall of the fluid bend 11, resulting in a decrease in heat transfer efficiency and thus a decrease in the steam generation efficiency of the steam generator 100. Conversely, when the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 is too large, the heat transfer path between the heating bend 21 and the fluid bend 11 is too long, requiring a longer time for the pipe wall of the fluid bend 11 to reach the target temperature. This leads to a decrease in the heating efficiency of the fluid in the fluid pipe 1, which also reduces the steam generation efficiency of the steam generator 100.

[0049] Therefore, both excessively large and excessively small thermal gaps 10a between the heating bend 21 and the fluid bend 11 are detrimental to steam generation. By setting the minimum value C of the thermal gap 10a to 3-8 mm, the heat transfer path between the heating bend 21 and the fluid bend 11 can be reduced, shortening the time required for the wall of the fluid bend 11 to reach the target temperature. At the same time, the temperature of the wall of the fluid bend 11 will not be too high, thus preventing film boiling and improving heat transfer efficiency. This can improve the steam generation efficiency of the steam generator 100.

[0050] Optionally, the minimum value C of the thermally conductive gap 10a can be 3mm, 4mm, 4.2mm, 4.5mm, 5mm, 8mm, etc.

[0051] According to the steam generator 100 of this utility model embodiment, the fluid pipe 1 has a fluid bend 11, which enables the fluid to generate Dean vortices when flowing in the fluid bend 11, increasing the amount of fluid in contact with the pipe wall of the fluid bend 11, thereby enhancing the heat exchange capacity between the fluid and the high-temperature pipe wall, and thus improving the heating effect of the fluid; and by controlling the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11, the heat transfer path between the heating bend 21 and the fluid bend 11 can be reduced, while reducing the possibility of film boiling caused by excessively high temperature of the pipe wall of the fluid bend 11, thereby improving the heat transfer efficiency and thus improving the steam generation efficiency of the steam generator 100.

[0052] In some embodiments of this utility model, such as Figure 2 As shown, the heating bend 21 is located radially inside the fluid bend 11, and the ratio R1 / R2 of the radius R1 of the heating bend 21 and the radius R2 of the fluid bend 11 ranges from 2 / 3 to 3 / 4.

[0053] The heating bend 21 heats the fluid inside the outer fluid bend 11. The heating bend 21 is located on the radial inner side of the fluid bend 11 and does not occupy the radial outer space of the fluid bend 11. This helps to reduce the volume of the fluid bend 11 and the heating bend 21, which can meet the miniaturization requirements of the steam generator 100 and facilitate the arrangement and assembly of the steam generator 100.

[0054] It is worth noting that the radius R1 of the heated bend 21 refers to the bending radius of the heated bend 21, such as... Figure 2 As shown, the radial dimension is the distance from the center of the heating bend 21 to the center of its diameter. Similarly, the radius R2 of the fluid bend 11 refers to the bending radius of the fluid bend 11. Figure 2 As shown, this is the radial dimension from the center of the fluid bend 11 to the center of the diameter of the fluid bend 11.

[0055] The heating bend 21 is located radially inside the fluid bend 11. Therefore, the radius R1 of the heating bend 21 is limited by the radius R2 of the fluid bend 11, meaning R1 is smaller than R2. However, if R1 is too small, the overall length of the heating bend 21 will decrease, reducing its heating capacity. This necessitates increasing the power density of the heating bend 21 to meet steam generation requirements, leading to increased consumption and potentially causing localized overheating, thus reducing the operational reliability of the steam generator 100. Conversely, if R2 is too large, the thermal gap 10a will be too small, also resulting in decreased heat transfer efficiency.

[0056] Therefore, setting the radius R1 of the heating bend 21 and the radius R2 of the fluid bend 11 to R1 / R2 as 2 / 3-3 / 4 is optimal. This can reduce power consumption and improve the operational reliability of the steam generator 100 while meeting the working requirements of the steam generator 100.

[0057] Optionally, the ratio R1 / R2 of the radius R1 of the heating bend 21 and the radius R2 of the fluid bend 11 can be 0.68, 0.7, 0.72, 0.73, 0.75, etc.

[0058] In some embodiments of this utility model, the radius R1 of the heating bend 21 ranges from 20 to 40 mm, and the radius R2 of the fluid bend 11 ranges from 30 to 60 mm.

[0059] A smaller radius of fluid bend 11 can enhance the Dean vortex induced inside the tube, which can improve the heat exchange efficiency between the fluid inside the fluid bend 11 and the high-temperature wall. However, if the radius R2 of fluid bend 11 is too small, the overall length of fluid bend 11 will decrease, which will lead to a reduction in the heat exchange path of the fluid inside the fluid bend 11, which will reduce the heating effect on the fluid.

[0060] Therefore, it is optimal to design the radius R2 of the fluid bend 11 to be 30-60mm. A smaller radius of the fluid bend 11 can enhance the Dean vortex induced inside the pipe, which can improve the heat exchange efficiency between the fluid and the high-temperature wall inside the fluid bend 11. It can also meet the heat exchange path length of the fluid bend 11, so that the fluid can fully exchange heat inside the fluid bend 11, which is beneficial to improving the heat exchange efficiency of the fluid.

[0061] Optionally, the radius R2 of the fluid bend 11 can be 30mm, 35mm, 40mm, 50mm, 60mm, etc.

[0062] The heating bend 21 is located radially inside the fluid bend 11, so the radius R1 of the heating bend 21 is limited by the radius R2 of the fluid bend 11. However, both excessively small R1 and excessively large R2 will lead to a decrease in heat transfer efficiency. Therefore, when the radius R2 of the fluid bend 11 is in the range of 30-60mm, it is optimal to design the radius R1 of the heating bend 21 to be 20-40mm to improve heat transfer efficiency.

[0063] Optionally, the radius R1 of the heating bend 21 can be 20mm, 28mm, 30mm, 35mm, 40mm, etc.

[0064] In some embodiments of this utility model, such as Figure 2 As shown, the ratio of the diameter D1 of the heating tube 2 to the radius R1 of the heating bend 21, D1 / R1, ranges from 1 / 4 to 4 / 15.

[0065] When the ratio D1 / R1 of the diameter D1 of the heating tube 2 and the radius R1 of the heating bend 21 is too large, the power density of the heating tube 2 decreases, and the heat is not easily dissipated, reducing the heat transfer efficiency. When the ratio D1 / R1 of the diameter D1 of the heating tube 2 and the radius R1 of the heating bend 21 is too small, the diameter D1 of the heating tube 2 is too small, the power density of the heating tube 2 increases, which will cause the local temperature to rise. Alternatively, if the radius R1 of the heating tube 2 is too large, it will increase the space occupied and make it difficult to match with the fluid bend 11.

[0066] Therefore, setting the ratio D1 / R1 of the diameter D1 of the heating tube 2 and the radius R1 of the heating bend 21 to be relatively small, and setting D1 / R1 to 1 / 4-4 / 15 is optimal, can reduce the space occupied by the heating bend 21, and the power density of the heating bend 21 is appropriate, which can improve the heating speed of the fluid without causing local overheating, and improve the working reliability of the heating tube 2.

[0067] In some embodiments of this utility model, the diameter D1 of the heating tube 2 ranges from 5 to 10 mm, and the radius R1 of the heating bend 21 ranges from 20 to 40 mm.

[0068] When the power of heating tube 2 is the same, the power density of heating tube 2 increases as the diameter D1 of heating tube 2 decreases. Therefore, setting a smaller diameter D1 of heating tube 2 is beneficial to improving the heating effect on the fluid in the fluid bend 11. Furthermore, a smaller diameter D1 also helps to reduce the space occupied by heating tube 2, facilitating its integration with the fluid pipe 1 and improving the integration of the steam generator 100. However, if the diameter D1 of heating tube 2 is too small, the local temperature of heating tube 2 will become excessively high, posing a risk of damage to heating tube 2.

[0069] Therefore, setting the diameter D1 of the heating tube 2 to be relatively small, and designing the diameter D1 of the heating tube 2 to be 5-10mm is optimal, can reduce the space occupied by the heating bend 21, and the power density of the heating bend 21 is appropriate, which can improve the heating speed of the fluid without causing local overheating, and can improve the working reliability of the heating tube 2.

[0070] Optionally, the diameter D1 of the heating tube 2 can be 5mm, 6mm, 8mm, 8.5mm, 10mm, etc.

[0071] If the radius R1 of the heating bend 21 is too small, the overall length of the heating bend 21 will decrease, and the heating capacity of the heating bend 21 will decline. This necessitates increasing the power density of the heating bend 21 to meet the steam generation requirements, leading to increased consumption and potentially causing localized overheating, thus reducing the operational reliability of the steam generator 100. Conversely, if R2 is too large, the thermal gap 10a will become too small, also resulting in decreased heat transfer efficiency.

[0072] The ratio of the diameter D1 of the heating tube 2 to the radius R1 of the heating bend 21, D1 / R1, ranges from 1 / 4 to 4 / 15. Based on the diameter D1 of the heating tube 2 being in the range of 5-10mm, the radius R1 of the heating bend 21 is designed to be 20-40mm, and a larger design is better, which can improve the heat transfer efficiency and is beneficial to improving the steam generation efficiency of the steam generator 100.

[0073] Optionally, the radius R1 of the heating bend 21 can be 20mm, 26mm, 30mm, 38mm, 40mm, etc.

[0074] In some embodiments of this utility model, such as Figure 2 As shown, the ratio of the diameter D2 of fluid pipe 1 to the radius R2 of fluid bend 11, D2 / R2, ranges from 1 / 5 to 1 / 2.

[0075] The ratio D2 / R2 of the diameter D2 of fluid pipe 1 and the radius R2 of fluid bend 11 affects the formation and development of Dean vortex. The vortex intensity of Dean vortex increases monotonically with D2 / R2. Therefore, designing a larger ratio D2 / R2 of the diameter D2 of fluid pipe 1 and the radius R2 of fluid bend 11 is beneficial to enhancing the heat exchange capacity between the fluid and the high-temperature pipe wall.

[0076] However, when the ratio D2 / R2 of the diameter D2 of the fluid pipe 1 and the radius R2 of the fluid bend 11 is too large, the risk of Dean's vortex breaking and causing turbulent pulsation increases. Large particles of impurities in the fluid are more likely to deposit and clog the outside of the fluid bend 11, resulting in increased flow resistance. For example, when water flows inside the fluid bend 11, if the ratio D2 / R2 is too large, scale in the water is more likely to accumulate on the outside of the fluid bend 11.

[0077] Furthermore, if the ratio of the diameter D2 of fluid pipe 1 to the radius R2 of fluid bend 11, D2 / R2, is too large, it will cause the diameter D2 of fluid pipe 1 to increase or the radius R2 of fluid bend 11 to decrease, making heat exchange between the fluid and fluid bend 11 difficult and affecting the steam generation efficiency.

[0078] Therefore, the ratio D2 / R2 of the diameter D2 of fluid pipe 1 and the radius R2 of fluid bend 11 is designed to be larger, and the value range is 1 / 5-1 / 2. This can improve the heat exchange efficiency between the fluid and the high-temperature pipe wall, and reduce the occurrence of blockage in fluid bend 11.

[0079] In some embodiments of this utility model, the diameter D2 of the fluid pipe 1 ranges from 6 to 12 mm, and the radius R2 of the fluid bend 11 ranges from 30 to 60 mm.

[0080] A larger diameter fluid pipe 1 increases the cross-sectional area for fluid flow, reducing the likelihood of large particles clogging the fluid pipe 1 and improving the operational reliability of the steam generator 100. For example, when water flows within the fluid bend 11, a larger diameter fluid pipe 1 reduces the likelihood of scale buildup blocking water flow, thereby increasing the steam generator 100's tolerance to scale and extending its service life. However, if the diameter D2 of the fluid pipe 1 is too large, the fluid may not be able to fully contact the high-temperature wall surface, leading to deteriorated heat transfer and potentially causing localized overheating and damage to the steam generator 100.

[0081] Therefore, designing the diameter D2 of fluid pipe 1 to be 6-12mm is optimal. This increases the cross-sectional area for fluid flow, reduces the risk of blockage inside fluid pipe 1, and allows for sufficient heat exchange between the fluid and fluid pipe 1, thereby improving the operational reliability of fluid pipe 1.

[0082] Optionally, the diameter D2 of the fluid pipe 1 can be 6mm, 8mm, 8.5mm, 10mm, 12mm, etc.

[0083] A smaller radius of fluid bend 11 can enhance the Dean vortex induced inside the tube, which can improve the heat exchange efficiency between the fluid inside the fluid bend 11 and the high-temperature wall. However, if the radius R2 of fluid bend 11 is too small, the overall length of fluid bend 11 will decrease, which will lead to a reduction in the heat exchange path of the fluid inside the fluid bend 11, which will reduce the heating effect on the fluid.

[0084] The ratio of the diameter D2 of fluid pipe 1 to the radius R2 of fluid bend 11, D2 / R2, ranges from 1 / 5 to 1 / 2. Based on the diameter D2 of fluid pipe 1 being in the range of 6-12mm, the radius R2 of fluid bend 11 is designed to be 30-60mm, which is optimal. A smaller radius of fluid bend 11 can enhance the Dean vortex induced inside the pipe, improve the heat exchange efficiency between the fluid and the high-temperature wall inside fluid bend 11, and meet the heat exchange path length of fluid bend 11, so that the fluid can fully exchange heat inside fluid bend 11, which is beneficial to improving the heat exchange efficiency of the fluid.

[0085] Optionally, the radius R2 of the fluid bend 11 can be 30mm, 38mm, 40mm, 45mm, 60mm, etc.

[0086] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the fluid pipe 1 has multiple turns of fluid bend 11, which are arranged in a spiral shape; the heating pipe 2 has multiple turns of heating bend 21, which are arranged in a spiral shape.

[0087] The fluid pipe 1 has multiple turns of fluid bends 11, which are arranged in a spiral shape. This facilitates the formation of Dean vortices within the fluid bends 11, thereby enhancing the heat exchange capacity between the fluid and the high-temperature pipe wall and improving the heating effect of the fluid.

[0088] The heating tube 2 also has multiple heating bends 21 arranged in a spiral. The heating bends 21 and the fluid bends 11 work together to improve the fit between them, which is beneficial for heat transfer and can improve the heating effect of the heating tube 2 on the fluid tube 1.

[0089] In some embodiments of this utility model, the number of turns of the multi-turn fluid bend 11 is n1, and the number of turns of the multi-turn heating bend 21 is n2, where n1 = n2.

[0090] The number of fluid bends 11 is the same as the number of heating bends 21. Each turn of fluid bend 11 is heated, which can improve the situation where the temperature of a certain turn of heating bend 21 is too high and improve the working reliability of steam generator 100.

[0091] In some embodiments of this utility model, the number of turns n1 of the multi-turn fluid bend 11 ranges from 1 to 4, and the number of turns n2 of the multi-turn heating bend 21 ranges from 1 to 4.

[0092] The capacity of the fluid bend 11 is determined by the number of turns n1 and the radius R2 of the fluid bend 11. Furthermore, the number of turns n1 and the radius R2 of the fluid bend 11 also determine the volume of the fluid pipe 1. Therefore, when the radius R2 of the fluid bend 11 is small, a fluid bend 11 with a large number of turns can be used.

[0093] It is preferable to design the number of turns n1 of the multi-turn fluid bend 11 to be 1-4. The heat exchange path of the fluid is longer and the heat exchange is more sufficient, which can increase the steam generation and reduce the volume of the fluid pipe 1, which is beneficial to the miniaturization of the steam generator 100.

[0094] Optionally, the number of turns n1 of the fluid bend 11 can be 1, 2, 3 or 4.

[0095] The number of turns n2 of the heating bend 21 needs to be determined by considering both the power of the heating tube 2 and the radius R1 of the heating bend 21. For the same power of the heating tube 2, to meet power requirements, if the radius R1 of the heating bend 21 is large, the number of turns n2 of the heating bend 21 should be reduced accordingly; conversely, if the radius R1 of the heating bend 21 is small, the number of turns n2 of the heating bend 21 should be increased. Furthermore, the number of turns n2 and the radius R1 of the heating bend 21 directly affect the volume of the heating tube 2, and the number of turns n2 affects the thickness of the steam generator 100.

[0096] In addition, it is better if the number of heating bends 21 is similar to the number of fluid bends 11, which can improve the operational reliability of the steam generator 100.

[0097] Therefore, designing the number of turns n2 of the multi-turn heat exchange bend to be 1-4 is preferable. This satisfies the heating power of the heating tube 2 and also reduces the volume of the heating tube 2, which is beneficial for the miniaturization of the steam generator 100. It also improves the fit between the heating bend 21 and the fluid bend 11, reduces the problem of excessively high temperature in a certain turn of the heating bend 21, and enhances the operational reliability of the steam generator 100.

[0098] Optionally, the number of turns n2 of the heating bend 21 can be 1, 2, 3 or 4.

[0099] In some embodiments of this utility model, the heat-conducting element 3 at least completely encloses the fluid bend 11 and the heating bend 21.

[0100] The heat-conducting component 3 completely encloses the fluid bend 11 and the heating bend 21, thereby improving the heat transfer performance between the heating bend 21 and the fluid bend 11. The heating bend 21 can fully heat the fluid bend 11 to ensure that the liquid fluid in the fluid pipe 1 can be effectively converted into gaseous fluid, thus fully meeting the needs of use.

[0101] Furthermore, the fact that the heat-conducting component 3 completely encloses the fluid bend 11 and the heating bend 21 can also protect the fluid bend 11 and the heating bend 21, reduce the interference of the external environment on the fluid bend 11 and the heating bend 21, and improve the working reliability of the steam generator 100.

[0102] In some embodiments of this utility model, such as Figure 1 As shown, the heat-conducting component 3 is a die-cast aluminum shell.

[0103] During the production and assembly of the steam generator 100, the fluid pipe 1 and the heating pipe 2 are joined together and die-cast into an aluminum shell. At least the heating bend 21 and the fluid bend 11 are die-cast together to form the overall structure of the steam generator 100. The die-cast aluminum parts are lightweight and easy to install. In addition, the die-cast aluminum shell has good thermal conductivity. The die-cast aluminum shell encloses the heating pipe 2 and the fluid pipe 1, transferring the heat generated by the heating pipe 2 to the fluid in the fluid pipe 1. The die-cast aluminum shell uses a die-casting process to ensure that there are no gaps between the die-cast aluminum shell and the fluid pipe 1 and the heating pipe 2, thus ensuring the heat exchange effect.

[0104] In some embodiments of this utility model, such as Figure 1 As shown, the steam generator 100 also includes a mounting bracket 4 disposed on the heat-conducting component 3.

[0105] Mounting bracket 4 securely mounts the steam generator 100, which can stably position the steam generator 100 and improve the working reliability of the steam generator 100.

[0106] The structure, some dimensions, and working process of a steam generator 100 according to a specific embodiment of the present invention are described below with reference to the accompanying drawings.

[0107] The steam generator 100 includes a fluid pipe 1, a heating pipe 2, and a heat-conducting component 3. The fluid pipe 1 includes two spiral fluid bends 11, and an inlet section 12 and an outlet section 13 communicating with the fluid bends 11. The heating pipe 2 includes two spiral heating bends 21, which are located radially inside the fluid bends 11. The heat-conducting component 3 is a die-cast aluminum shell. The die-cast aluminum shell is used to die-cast the heating bends 21 and the fluid bends 11 together, enclosing the heating pipe 2 and the fluid pipe 1 inside, and conducting the heat generated by the heating pipe 2 to the fluid in the fluid pipe 1. The die-cast aluminum shell is made using a die-casting process to ensure that there are no gaps between the die-cast aluminum shell and the fluid pipe 1 and the heating pipe 2, thus ensuring the heat exchange effect.

[0108] In order to improve the steam generation efficiency of the steam generator 100, the diameter D1 of the heating tube 2, the diameter D2 of the fluid tube 1, the radius R1 of the heating bend 21, the radius R2 of the fluid bend 11, and the minimum value C of the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 are all designed.

[0109] Regarding the diameter D1 of heating tube 2, under the premise of ensuring the same power of heating tube 2, the power density of heating tube 2 increases as the diameter D1 of heating tube 2 decreases. An excessively small diameter D1 will cause localized overheating, leading to damage to the steam generator 100. However, an excessively large diameter D1 will reduce the integration of the steam generator 100, increase its size, and affect the usable volume of the steam chamber using the steam generator 100. Therefore, a diameter D1 of 8mm for heating tube 2 is preferable.

[0110] A larger diameter D2 for the fluid pipe 1 increases the cross-sectional area for water flow, thereby improving the steam generator 100's tolerance to scale and extending its service life. However, an excessively large diameter D2 will prevent the liquid water from fully contacting the high-temperature wall surface, leading to deteriorated heat transfer and potentially causing localized overheating and damage to the steam generator 100. Therefore, a diameter D2 of 8 mm is preferable for the fluid pipe 1.

[0111] Regarding the radius R1 of the heating bend 21 and the radius R2 of the fluid bend 11, the heating bend 21 is arranged inside the fluid bend 11, and R1 is limited by the size of R2, i.e., R1 < R2. A smaller radius R1 of the heating bend 21 will result in a reduction in the overall length of the heating tube 2, requiring an increase in the power density of the heating tube 2 to meet the same power demand. Excessive power density will lead to excessively high local temperatures in the steam generator 100, reducing the reliability of the steam generator 100. Therefore, a radius R1 of 30 mm for the heating bend 21 is preferable.

[0112] A smaller radius R2 of the fluid bend 11 can enhance the Dean vortex induced by the helical tube, thereby improving the heat exchange efficiency between the liquid water inside the fluid tube and the high-temperature wall. Therefore, a radius R2 of 40 nm is preferred for the fluid bend 11.

[0113] Regarding the minimum value C of the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11, if the minimum value C is too small, heat will concentrate on the inner wall of the fluid pipe 1, causing the inner wall temperature of the fluid pipe 1 to be too high, triggering film boiling and leading to deteriorated heat transfer, thus weakening the steam generation performance of the steam generator 100. If the minimum value C of the thermally conductive gap 10a is too large, it will result in a longer heat exchange path, and the wall temperature of the fluid pipe 1 will take a longer time to reach the target temperature during operation, prolonging the steam generation time of the steam generator 100 and reducing the performance of the steam generator 100. Therefore, a minimum value C of 4.2 mm for the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 is preferable.

[0114] When the steam generator 100 is in use, liquid water flows in from the inlet section 12 and flows along the fluid bend 11 to the outlet section 13. The heating tube 2 continuously converts the input electrical energy into heat energy. The heat energy generated by the heating tube 2 heats the liquid water in the fluid tube 1 through the die-cast aluminum shell and the fluid tube 1 by heat conduction and vaporizes it into steam. The steam flows out from the outlet section 13 and can be used to cook food.

[0115] The steam generator 100 of some embodiments of this utility model has an actual power of 2600W, and can achieve a thermal efficiency of 97.37% and stably produce water steam with a dryness of 97% at a water flow rate of 56g / min. It can work continuously for 9 hours when using hard water with a concentration of 7mmol / L.

[0116] In some embodiments of this utility model, the actual power of the steam generator 100 is 2600W, the diameter D1 of the heating tube 2 is 8mm, the radius R1 of the heating bend 21 is 30mm, the diameter D2 of the fluid tube 1 is 8mm, the radius R2 of the fluid bend 11 is 40mm, and the minimum value C of the thermally conductive gap 10a between the heating bend 21 and the fluid bend 11 is 4.2mm.

[0117] Figure 6 The diagram shows the steam thermal efficiency and steam dryness of a steam generator 100 according to some embodiments of the present invention.

[0118] The horizontal axis represents water flow rate, measured in g / min. The orange area in the graph indicates the preheating process of the steam generator 100. This preheating process refers to the process where the heating element 2 of the steam generator 100 first heats the fluid pipe 1 to a certain temperature before water is supplied into the fluid pipe 1. The blue area in the graph represents the normal operation process of the steam generator 100, which is the simultaneous supply of water to the fluid pipe 1 and heating of the fluid pipe 1 by the heating element 2.

[0119] As can be clearly seen from the figure, the thermal efficiency of the steam generator 100 is high in both the preheating and normal operation processes, reaching over 95% under various water flow rates. The thermal efficiency of the preheating steam generator 100 can reach over 98%. Furthermore, the steam generator 100 can basically produce water vapor with a dryness of 94% or higher in both the preheating and normal operation processes.

[0120] The cooking apparatus 1000 of the second aspect of this utility model is described below with reference to the accompanying drawings.

[0121] According to an embodiment of the present utility model, the cooking device 1000, such as Figure 4 and Figure 5 As shown, it includes: a housing 200 and a steam generator 100. The housing 200 is provided with a cooking chamber 201. The steam generator 100 is a steam generator 100 according to the first aspect of the present invention. The steam generator 100 is located in the housing 200, and the outlet section 13 is connected to the cooking chamber 201.

[0122] When the steam generator 100 is in use, liquid fluid flows in from the inlet section 12 and flows along the fluid bend 11 to the outlet section 13. During the flow, the heating tube 2 heats the fluid in the fluid bend 11 through the heat-conducting element 3, causing the fluid to undergo a phase change and generate high-temperature steam, which flows out from the outlet section 13. The outlet section 13 is connected to the cooking chamber 201, so that steam can be used to cook food.

[0123] By setting the steam generator 100 of the first aspect of this utility model, the steam generator 100 has a high steam generation efficiency, which can meet the usage requirements of large-capacity cooking equipment 1000.

[0124] For example, the cooking device 1000 is a large-capacity box, which can efficiently generate a large amount of water steam by utilizing the steam generator 100 described above to meet cooking needs.

[0125] Other components of the steam generator according to the embodiments of the present invention, such as the structure of the heating tube, are known to those skilled in the art and will not be described in detail here.

[0126] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0127] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A steam generator, characterized in that, include: A fluid pipe having at least one fluid bend, the fluid pipe having an inlet section and an outlet section communicating with the fluid bend; A heating tube having at least one heating bend, wherein one of the fluid bend and the heating bend is located radially inside the other; a thermally conductive gap is provided between the heating bend and the fluid bend, wherein the minimum value of the thermally conductive gap in the radial direction of the heating tube ranges from 3 to 8 mm; A heat-conducting element, at least a portion of which fills the heat-conducting gap.

2. The steam generator according to claim 1, characterized in that, The heating bend is located radially inside the fluid bend, and the ratio of the radius of the heating bend to the radius of the fluid bend ranges from 2 / 3 to 3 / 4.

3. The steam generator according to claim 2, characterized in that, The radius of the heating bend is in the range of 20-40mm, and the radius of the fluid bend is in the range of 30-60mm.

4. The steam generator according to claim 1, characterized in that, The ratio of the diameter of the heating tube to the radius of the heating bend is in the range of 1 / 4 to 4 / 15.

5. The steam generator according to claim 4, characterized in that, The diameter of the heating tube is in the range of 5-10mm, and the radius of the heating bend is in the range of 20-40mm.

6. The steam generator according to claim 1, characterized in that, The ratio of the diameter of the fluid pipe to the radius of the fluid bend ranges from 1 / 5 to 1 / 2.

7. The steam generator according to claim 6, characterized in that, The diameter of the fluid pipe is in the range of 6-12 mm, and the radius of the fluid bend is in the range of 30-60 mm.

8. The steam generator according to claim 1, characterized in that, The fluid tube has multiple turns of the fluid bend, which are arranged in a spiral shape. The heating tube has multiple turns of the heating bend, which are arranged in a spiral shape.

9. The steam generator according to claim 8, characterized in that, The number of turns of the fluid bend is n1, and the number of turns of the heating bend is n2, where n1 = n2.

10. The steam generator according to claim 8, characterized in that, The number of turns n1 of the multi-turn fluid bend ranges from 1 to 4, and the number of turns n2 of the multi-turn heating bend ranges from 1 to 4.

11. The steam generator according to any one of claims 1-10, characterized in that, The heat-conducting component at least completely encloses the fluid bend and the heating bend.

12. The steam generator according to claim 11, characterized in that, The heat-conducting component is a die-cast aluminum shell.

13. The steam generator according to claim 11, characterized in that, The steam generator also includes a mounting bracket disposed on the heat-conducting component.

14. A cooking appliance, characterized in that, include: The box body, wherein a cooking chamber is provided inside the box body; A steam generator, wherein the steam generator is the steam generator according to any one of claims 1-13, the steam generator is disposed in the housing, and the outlet section is connected to the cooking chamber.

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