High-temperature steam cooking utensil

Abstract

The invention discloses a high-temperature steam cooking utensil which is internally provided with a cooking cavity and a water tank, the water tank is internally provided with a water insulation cover and a first heating piece, and the water insulation cover divides the water tank into an evaporation cavity located outside the water insulation cover and an overheating cavity located in the water insulation cover; the first heating piece is used for heating the evaporation cavity to generate steam, a second heating piece and a heat conduction cover are arranged in the overheating cavity, and the second heating piece is arranged in the heat conduction cover in a protruding mode and used for heating the steam and the heat conduction cover. The heat conduction cover is arranged between the waterproof cover and the second heating piece so as to divide the overheating cavity into an air inlet channel and an air outlet channel. By arranging the heat conduction cover located between the waterproof cover and the second heating piece, the heat exchange area in unit volume is increased, the effect that steam is heated for multiple times is achieved, the steam can have the higher temperature in a path with the same length, and the generation efficiency of superheated steam is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of household appliances, and in particular relates to a high-temperature steam cooking appliance. Background Art

[0002] Steam cooking is one of the most common cooking methods in daily life. It can heat the ingredients evenly and fully retain the nutrients, so it is widely used in many cooking appliances such as steam rice cookers, steamers, and electric steamers. Traditional steam cooking appliances are mostly composed of a cooking cavity and a water tank. The heating element heats the water in the water tank. The steam generated by the boiling water rises into the cooking cavity to heat and steam the food placed in the cooking cavity. However, the steam generated by this method has high humidity and relatively low temperature. When heating food, it is easy to form a large amount of condensed water film on the surface of the food, causing the surface of the food to be too wet, affecting the taste of the food. It will also form a barrier between the steam and the food, affecting the heating inside the food, and thus affecting the heating efficiency of the food.

[0003] To solve this problem, in the prior art, an overheating chamber with a spiral heating tube is set in the water tank. After the steam enters the overheating chamber, it is secondary heated by the heating tube. However, this solution only uses the heating tube as a heat source for secondary heating. The heat exchange area per unit volume is low, and only part of the steam can be fully heated by the secondary heating element, which ultimately leads to low efficiency in generating superheated steam. Summary of the invention

[0004] The present invention provides a high-temperature steam cooking appliance to solve at least one of the above technical problems.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0006] A high-temperature steam cooking appliance, wherein a cooking chamber and a water tank are provided inside the steam cooking appliance, a water-proof cover and a first heating element are provided inside the water tank, the water-proof cover divides the water tank into an evaporation chamber located outside the water-proof cover and an overheating chamber located inside the water-proof cover, the first heating element is used to heat the evaporation chamber to generate steam, a second heating element and a heat-conductive cover are provided in the overheating chamber, the second heating element is protruded inside the heat-conductive cover and is used to heat steam and the heat-conductive cover, the heat-conductive cover is provided between the water-proof cover and the second heating element to divide the overheating chamber into an air inlet channel and an air outlet channel.

[0007] In one embodiment of the present invention, the second heating element includes a heat transfer element and a heating element disposed inside the heat transfer element, the outer surface of the heat transfer element is provided with at least two heat transfer protrusions protruding outward, and the heat conductive cover is sleeved on the heat transfer protrusions.

[0008] In one embodiment of the present invention, the heat transfer protrusions are vertically or obliquely extended in the up-down direction to form a steam flow channel between the heat conductive cover and two adjacent heat transfer protrusions.

[0009] In one embodiment of the present invention, the second heating element includes a heat transfer element and a heating element arranged inside the heat transfer element, a plurality of support blocks are provided at the lower portion of the heat transfer element, the heat conductive cover is supported on the support blocks, and an air port connecting the air inlet channel and the air outlet channel is formed between adjacent support blocks; or, an air port connecting the air inlet channel and the air outlet channel is provided at the bottom of the heat conductive cover.

[0010] In one embodiment of the present invention, the air inlet channel is formed between the heat-conducting cover and the water-proof cover, and the air outlet channel is formed between the second heating element and the heat-conducting cover.

[0011] In one embodiment of the present invention, the first heating element comprises a heat conducting plate and a heating tube for heating the heat conducting plate, and the water-proof cover and the second heating element are arranged on the heat conducting plate.

[0012] In one embodiment of the present invention, the heat conducting plate has a positioning protrusion which protrudes upward and is used to set the second heating element, and the water-proof cover is sleeved on the positioning protrusion.

[0013] In one embodiment of the present invention, a mounting platform is provided at the bottom of the second heating element, and the steam cooking appliance further comprises a heat insulating element, which is sandwiched between the mounting platform and the heat conducting plate.

[0014] In one embodiment of the present invention, the water-proof cover is provided with a steam inlet connecting the evaporation chamber and the air inlet channel and a superheated steam outlet connecting the air outlet channel and the cooking chamber, and the upper end of the heat-conductive cover abuts against the inner wall of the water-proof cover between the steam inlet and the superheated steam outlet.

[0015] In one embodiment of the present invention, the surface of the second heating element is coated with a food-grade coating or the surface of the second heating element is provided with a food-grade oxidation layer.

[0016] After adopting the above technology, the beneficial effects of the present invention are:

[0017] The present invention arranges a heat-conducting cover between the water-proof cover and the second heating element, and forms an air inlet channel and an air outlet channel with the help of the heat-conducting cover. On the one hand, the space in the superheating chamber is fully utilized, so that the overall path of the steam generated in the evaporation chamber in the superheating chamber can be extended, which is conducive to the full heating of the steam; on the other hand, the heat-conducting cover can absorb and reflect the heat from the second heating element, and serve as an auxiliary heating element to heat the steam in the superheating chamber together with the second heating element, so that the steam first increases a certain temperature in the air inlet channel, and then further heats after entering the air outlet channel, thereby increasing the heat exchange area per unit volume, achieving the effect of multiple heating of steam, so that the steam can have a higher temperature under the same length of path, and greatly improving the efficiency of superheated steam generation. In addition, since the second heating element only heats the steam entering the superheating chamber, scale is not easy to accumulate during the heating process, which is conducive to increasing the service life of the steam cooking appliance, extending the maintenance cycle of the steam cooking appliance, and improving the user experience.

[0018] This allows the superheated chamber to output superheated steam with a higher temperature and dryness, reducing the probability of condensation film forming on the food surface and preventing the surface from being too wet and affecting the taste of the food. It also makes the steam's thermal penetration stronger, allowing the inside of the food to be better heated, improving the efficiency of cooking food and achieving the effect of high-temperature rapid steaming.

[0019] As a preferred embodiment of the present invention, the second heating element includes a heat transfer element and a heating element arranged inside the heat transfer element, the outer surface of the heat transfer element is provided with at least two heat transfer protrusions protruding toward the outside, and the heat conductive cover is sleeved on the heat transfer protrusions. The arrangement of the heat transfer protrusions increases the surface area of ​​the second heating element, and then increases the heat transfer area between the second heating element and the steam, so that the second heating element can be in contact with the steam more, increasing the heat exchange; and, such an arrangement, on the one hand, allows the second heating element to conveniently transfer heat to the heat conductive cover through the heat transfer protrusions, thereby improving the effect of the heat conductive cover heating the steam, and on the other hand, it can also divide the air outlet channel and form a small space heating channel between the heat conductive cover and the heat transfer protrusions, so that the steam is in more sufficient contact with the heat conductive cover and the second heating element, and the heat conductive cover and the second heating element can form a three-dimensional heating of the steam, further improving the heating efficiency of the steam and the efficiency of generating superheated steam.

[0020] As a preferred embodiment of the present invention, the air inlet channel is formed between the heat-conducting cover and the water-proof cover, and the air outlet channel is formed between the second heating element and the heat-conducting cover. In this way, the heat-conducting cover preheats the steam in the air inlet channel after absorbing and reflecting the heat from the second heating element, so that the steam is first raised to a certain temperature, which is convenient for the steam to be heated multiple times and fully, and at the same time, the humidity of the steam entering the air outlet channel is reduced, so that the over-humidified steam is prevented from contacting with the high-temperature second heating element to cause corrosion and damage to the surface of the second heating element, thereby increasing the service life of the second heating element.

[0021] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the steam cooking appliance in one embodiment of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structural diagram of the water-shielding cover, the heat-conducting cover and the second heating element in one embodiment of the present invention;

[0024] Figure 3 It is a schematic cross-sectional structural diagram of the water-shielding cover, the heat-conducting cover and the second heating element in one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the explosion structure of the first heating element, the water-proof cover, the heat-conducting cover and the second heating element in one embodiment of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the first heating element, the heat-conducting cover and the second heating element in one embodiment of the present invention;

[0027] Figure 6 It is a partial structural schematic diagram of the steam cooking appliance in one embodiment of the present invention.

[0028] Figure numerals: cooking chamber 100; evaporation chamber 110; water replenishment chamber 120; overheating chamber 130; air inlet channel 131; air outlet channel 132; air outlet 133; base 200; water tank 210; flow rib 211; first heating element 220; heat conducting plate 221; heating tube 222; positioning protrusion 223; pot body 300; juice collecting plate 310; exhaust hole 311; connecting piece 312; water-proof rib 313; steaming layer 320; water-proof cover 400; steam inlet 401; overheated steam outlet 402; second heating element 500; heat transfer element 510; heat transfer protrusion 511; support block 512; protrusion 513; positioning hole 514; heating element 520; mounting platform 530; heat insulation element 540; heat insulation sealing part 541; heat conductive cover 600; guide part 610. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the technical solutions and embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0031] refer to Figures 1 to 6 The present embodiment provides a high-temperature steam cooking device, wherein a cooking cavity 100 and a water tank 210 are provided inside the steam cooking device, a water barrier 400 and a first heating element 220 are provided inside the water tank 210, the water barrier 400 divides the water tank 210 into an evaporation cavity 110 located outside the water barrier 400 and an overheating cavity 130 located inside the water barrier 400, the first heating element 220 is used for heating the evaporation cavity 110 to generate steam, a second heating element 500 and a heat-conducting cover 600 are provided inside the overheating cavity 130, the second heating element 500 is protrudingly provided inside the heat-conducting cover 600 and is used for heating steam and the heat-conducting cover 600, the heat-conducting cover 600 is provided between the water barrier 400 and the second heating element 500 to divide the overheating cavity 130 into an air inlet channel 131 and an air outlet channel 132.

[0032] Preferably, reference Figure 1 The superheating chamber 130 is disposed in the evaporation chamber 110. Such a composite structure allows the steam generated by the evaporation chamber 110 to smoothly enter the superheating chamber 130 through a shorter path, and can prevent the superheating chamber 130 from occupying too much volume of the water tank 210, resulting in a decrease in the volume of the water tank 210, thereby extending the time for the steam cooking appliance to continuously generate steam. Of course, the superheating chamber 130 can also be independently disposed separately from the evaporation chamber 110, and the present invention does not specifically limit the position of the superheating chamber 130.

[0033] The present invention does not specifically limit the form of the second heating element 500. The second heating element 500 can be a rod-shaped heating block, a ring-shaped or spiral heating tube, or a part of the first heating element 220. Those skilled in the art can make a selection based on actual conditions.

[0034] When in use, food is placed in the cooking cavity 100, and a proper amount of water is injected into the water tank 210. The first heating element 220 heats the water entering the evaporation cavity 110 to generate steam. The steam enters the air outlet channel 132 through the air inlet channel 131 and is heated by the heat conductive cover 600 and the second heating element 500 in the process to form superheated steam. Finally, the superheated steam enters the cooking cavity 100 to cook the food therein.

[0035] In this embodiment, a heat-conducting cover 600 is arranged between the water-proof cover 400 and the second heating element 500, and an air inlet channel 131 and an air outlet channel 132 are formed by the heat-conducting cover 600. On the one hand, the space in the superheat chamber 130 is fully utilized, so that the overall path of the steam generated in the evaporation chamber 110 in the superheat chamber 130 is extended, which is beneficial to the sufficient heating of the steam; on the other hand, the heat-conducting cover 600 can absorb and reflect the heat from the second heating element 500, and serve as an auxiliary heating element to heat the steam in the superheat chamber 130 together with the second heating element 500, so that the steam first increases its temperature to a certain extent in the air inlet channel 131, and then is further heated after entering the air outlet channel 132, thereby increasing the heat exchange area per unit volume, achieving the effect of multiple heating of the steam, so that the steam can have a higher temperature under the same length of path, and greatly improving the efficiency of superheated steam generation. In addition, since the second heating element 500 only heats the steam entering the superheating chamber 130, scale is not easily accumulated during the heating process, which is beneficial to increasing the service life of the steam cooking appliance, extending the maintenance cycle of the steam cooking appliance, and improving the user experience.

[0036] In this way, the superheating chamber 130 can output superheated steam with a high temperature and dryness, reducing the probability of condensed water film forming on the surface of food, avoiding excessive moisture on the surface affecting the taste of food, and also making the heat penetration of steam stronger, so that the inside of the food can be better heated, improving the efficiency of cooking food, and achieving the effect of high-temperature rapid steaming. In addition, for fresh food and other ingredients, the high temperature environment in the cooking chamber can also cause the protein on the surface of such food to quickly denature and shrink to form a denatured layer, so that most of the water, nutrients, etc. are locked in the denatured layer, avoiding the loss of a large amount of nutrients, and can also keep the food in a full shape, thereby achieving the effect of high-temperature steam locking freshness, and the food can be steamed faster and more tender, improving the quality of cooking.

[0037] Preferably, the heat conductive cover 600 is made of metal with good thermal conductivity such as aluminum, or other materials with good thermal conductivity, and the water shield 400 is made of heat insulating material. Of course, the water shield can also be made of materials with relatively poor thermal conductivity such as stainless steel, which is not limited here.

[0038] It should be noted that the "high temperature" in the high temperature steam cooking appliance refers to a temperature exceeding 100 degrees Celsius and less than 250 degrees Celsius.

[0039] In some preferred embodiments of the present invention, the temperature of the superheated steam when entering the cooking cavity is not less than 104 degrees Celsius, for example 104 degrees Celsius, 105 degrees Celsius, 110 degrees Celsius, 115 degrees Celsius, 120 degrees Celsius, etc., so that the steam cooking appliance can generate small molecule high-temperature steam, improve the thermal penetration of the steam and the cooking quality.

[0040] In some embodiments of the present invention, reference Figure 3 , Figure 4 and Figure 5 The second heating element 500 includes a heat transfer element 510 and a heating element 520 disposed inside the heat transfer element 510 . The outer surface of the heat transfer element 510 is provided with at least two heat transfer protrusions 511 protruding outward, and the heat conductive cover 600 is sleeved on the heat transfer protrusions 511 .

[0041] The arrangement of the heat transfer protrusion 511 increases the surface area of ​​the second heating element 500, and then increases the heat transfer area between the second heating element 500 and the steam, so that the second heating element 500 can be in contact with the steam more, thereby increasing the heat exchange amount; and, such an arrangement, on the one hand, allows the second heating element 500 to conveniently transfer heat to the heat conductive cover 600 through the heat transfer protrusion 511, thereby improving the effect of the heat conductive cover 600 heating the steam, and on the other hand, it can also divide the air outlet channel 132 and form a small space heating channel between the heat conductive cover 600 and the heat transfer protrusion 511, so that the steam is in more complete contact with the heat conductive cover 600 and the second heating element 500, and the heat conductive cover 600 and the second heating element 500 can form three-dimensional heating of the steam, thereby further improving the heating efficiency of the steam and the efficiency of generating superheated steam.

[0042] It should be noted that the heat conductive cover 600 can be sleeved on the heat transfer protrusion 511 so that part of the heat transfer protrusion 511 abuts against the inner wall of the heat conductive cover 600. For example, the heat transfer protrusion 511 has a draft angle, so that the lower part of the heat transfer protrusion 511 abuts against the heat conductive cover 600, and the upper part has a certain gap with the heat conductive cover 600.

[0043] Optionally, the heating element 520 is a heating tube, and the heat transfer element 510 is an aluminum block wrapped outside the heating tube.

[0044] The present invention does not specifically limit the form of the heat transfer protrusion 511. Preferably, refer to Figure 4The heat transfer protrusions 511 are vertically or obliquely extended in the up-down direction to form a steam flow channel between the heat conductive cover 600 and two adjacent heat transfer protrusions 511. In this way, the effects of sufficient steam heating and rapid steam discharge can be balanced, so that the steam in the steam flow channel can fully contact with the second heating element 500 and the heat conductive cover 600, and receive three-dimensional heating from the second heating element 500 and the heat conductive cover 600, while the superheated steam does not take a long time to be discharged from the superheating chamber 130 due to the excessively long steam path.

[0045] Of course, the above embodiments do not mean that the present invention excludes other forms of heat transfer protrusions. For example, in a specific embodiment, the heat transfer protrusion 511 is a spiral protrusion structure surrounding the surface of the heat transfer element 510, and a steam flow channel is formed between two adjacent heat transfer protrusions; in another specific embodiment, the heat transfer protrusion 511 is an annular protrusion, and a vent is provided on the annular protrusion for steam to flow through.

[0046] In some embodiments of the present invention, reference Figure 4 and Figure 5 The second heating element 500 includes a heat transfer element 510 and a heating element 520 disposed inside the heat transfer element 510. A plurality of support blocks 512 are disposed at the lower portion of the heat transfer element 510. The heat conductive cover 600 is supported on the support blocks 512. An air port 133 connecting the air inlet channel 131 and the air outlet channel 132 is formed between adjacent support blocks 512. Such a simple structure is convenient for the second heating element 500 to transfer heat to the heat conductive cover 600 through the support blocks 512, thereby ensuring the heating effect of the heat conductive cover 600 on the steam. It is also convenient for the steam to be further heated by the support blocks 512 when passing through the air port 133, thereby improving the heating efficiency of the steam and the efficiency of generating superheated steam.

[0047] Furthermore, the upper part of the water-proof cover 400 is provided with a steam inlet 401 connected to the air inlet channel 131 and a superheated steam outlet 402 connected to the air outlet channel 132, that is, the heights of the steam inlet 401 and the superheated steam outlet 402 are higher than the height of the air port 133. Such a configuration enables the steam generated in the evaporation chamber 110 to diffuse downward from the top steam inlet 401 under the impetus of the steam pressure and flow into the air inlet channel 131, and then flow out from the top superheated steam outlet 402 after entering the air outlet channel 132 through the bottom air port 133. This top-down diffusion mode, which is opposite to the natural flow direction of steam, prolongs the contact time between the steam and the heat-conducting cover 600 and the second heating element 500, increases the heat exchange, and enables the steam to continue to fully absorb heat during the flow of this path, so that the superheated steam outlet 402 can output superheated steam with a higher temperature and dryness from the very beginning.

[0048] It should be noted that this embodiment does not exclude the arrangement of the steam inlet 401 and the superheated steam outlet 402 at other positions, and those skilled in the art may adjust the positions of the steam inlet 401, the superheated steam outlet 402 and the air outlet 133 according to actual conditions.

[0049] It is understandable that the air port 133 may also be set at other positions, which is not limited here. For example, the heat conductive cover 600 is mounted outside the second heating element 500, and the bottom of the heat conductive cover 600 is provided with an air port 133 connecting the air inlet channel 131 and the air outlet channel 132. At this time, the heat conductive cover 600 may be in contact with the heat transfer element 510 through a support block similar to the above-mentioned one, or may not be in contact with the heat transfer element 510. The second heating element 500 heats the heat conductive cover 600 by heat radiation.

[0050] As a preferred embodiment of the present invention, refer to Figure 1 , Figure 3 and Figure 6 The air inlet channel 131 is formed between the heat-conducting cover 600 and the water-proof cover 400, and the air outlet channel 132 is formed between the second heating element 500 and the heat-conducting cover 600. This arrangement allows the heat-conducting cover 600 to preheat the steam in the air inlet channel 131 after absorbing and reflecting the heat from the second heating element 500, so that the steam is first raised to a certain temperature, which is convenient for the steam to be heated multiple times and fully, and at the same time, the humidity of the steam entering the air outlet channel 132 is reduced, so that the over-humidified steam is prevented from contacting with the high-temperature second heating element to cause corrosion and damage to the surface of the second heating element 500, thereby increasing the service life of the second heating element 500.

[0051] In a specific embodiment, referring to Figure 1 and Figure 6 The top of the water-proof cover 400 is provided with a steam inlet 401 connected to the air inlet channel 131 and a superheated steam outlet 402 connected to the air outlet channel 132. The steam inlet 401 is located at the periphery of the superheated steam outlet 402. The steam cooking utensil also includes a connecting piece 312 for connecting the superheated steam outlet 402 and the cooking cavity 100.

[0052] Such an arrangement enables the air inlet channel 131 to be formed between the heat conductive cover 600 and the water-proof cover 400, and the air outlet channel 132 to be formed between the second heating element 500 and the heat conductive cover 600, so that the superheated steam can flow from the superheated steam outlet 402 to the cooking cavity 100 in a concentrated manner, reducing losses along the way. The superheated steam flow can efficiently enter the cooking cavity and fully heat the food, resulting in a better cooking effect.

[0053] Specifically, refer to Figure 1 and Figure 6The steam cooking appliance is provided with an exhaust hole 311 for discharging superheated steam, and the connecting piece 312 is a sealing ring arranged at the exhaust hole 311. One end of the sealing ring is ring-shaped and is attached to the inner circumference of the exhaust hole 311, and the other end is provided with a sealing lip and abuts between the steam inlet 401 and the superheated steam outlet 402, thereby forming a steam flow channel connecting the superheated steam outlet 402 and the cooking cavity 100.

[0054] It is understandable that in some alternative embodiments of the present invention, a sealing ring may be provided between the steam inlet 401 and the superheated steam outlet 402 so that the sealing lip of the sealing ring abuts against the outer periphery of the exhaust hole 311, or the peripheral wall of the exhaust hole 311 extends downward to form an annular rib abutting against the outer periphery of the superheated steam outlet 402, which is not specifically limited here.

[0055] Of course, the present invention does not exclude the embodiment in which the air outlet channel 132 is formed between the heat conductive cover 600 and the water-proof cover 400, and the air inlet channel 131 is formed between the second heating element 500 and the heat conductive cover 600. Those skilled in the art can make a selection based on the positions of the steam inlet 401, the superheated steam outlet 402 and the actual situation of the connecting piece 312.

[0056] In some embodiments of the present invention, reference Figure 1 , Figure 2 and Figure 4 The first heating element 220 includes a heat conducting plate 221 and a heating tube 222 for heating the heat conducting plate 221 , and the water-proof cover 400 and the second heating element 500 are disposed on the heat conducting plate 221 .

[0057] Such a composite structure increases the temperature of the bottom of the superheat chamber 130, so that the first heating element 220 and the second heating element 500 can heat the steam entering the superheat chamber together, thereby improving energy efficiency. At the same time, it can also reduce the temperature difference between the second heating element 500 and the heat conducting plate 221, thereby reducing the probability of the second heating element 500 dissipating heat to the outside through the bottom of the chamber, thereby ensuring the temperature of the superheat chamber 130 and improving the efficiency of generating superheated steam.

[0058] Preferably, the diameter of the water-proof cover 400 is smaller than the diameter of the heating tube 222, so that the heat of the heating tube 222 is concentrated to heat the water outside the superheating chamber 130, thereby increasing the steam generation rate.

[0059] In a specific embodiment, referring to Figure 2 , Figure 4 and Figure 5The heat conducting plate 221 has a positioning protrusion 223 which protrudes upward and is used to set the second heating element 500. The water-blocking cover 400 is sleeved on the positioning protrusion 223 so that the positioning protrusion 223 can position the water-blocking cover 400, thereby improving the assembly efficiency of the water-blocking cover 400 and increasing the installation stability of the water-blocking cover 400.

[0060] It can be understood that, in some alternative embodiments of the present invention, the positioning protrusion 223 may be provided with a positioning groove which is recessed downward and used to set the second heating element 500.

[0061] In a specific embodiment, referring to Figure 4 and Figure 6 A mounting platform 530 is provided at the bottom of the second heating element 500 , and the steam cooking appliance further includes a heat insulating element 540 , which is sandwiched between the mounting platform 530 and the heat conducting plate 221 .

[0062] Since the temperature of the second heating element 500 is generally higher than that of the first heating element 220, the provision of the thermal insulation element 540 can prevent the second heating element 500 from directly contacting the first heating element 220, thereby preventing the second heating element 500 from transferring heat to the outside of the superheat chamber 130 through the first heating element 220 or the water tank wall, reducing heat loss from the second heating element 500, and locking more heat in the superheat chamber 130, so that the heat generated by the second heating element 130 is concentrated in the superheat chamber 130 as much as possible to heat the steam, thereby increasing the temperature of the steam in the superheat chamber 130, shortening the time required to generate superheated steam, and improving the efficiency of generating superheated steam.

[0063] The installation platform 530 can be formed by the bottom of the second heating element 500, or can be formed by extending outward from the bottom of the second heating element to increase the diameter of the installation platform 530 and facilitate the installation of the insulation element 540, which is not specifically limited here.

[0064] Optionally, the middle part of the thermal insulation member 540 can be a solid structure or a hollow structure, that is, an opening is opened in the middle part of the thermal insulation member 540 to form an insulating gap between the mounting platform 530 and the heat conducting plate 221, and utilize air or vacuum with lower thermal conductivity to reduce heat loss in the overheating chamber 130.

[0065] For further reference, Figure 6 The second heating element 500 is provided with a positioning hole 514 , and the fastener extends into the positioning hole 514 to fix the second heating element 500 to the heat conducting plate 221 , and at the same time, the mounting platform 530 and the heat conducting plate 221 clamp the heat insulating element 540 .

[0066] Preferably, the fastener is a screw, and the screw rod of the screw passes through the water tank 210 and extends into the positioning hole 514 to achieve a fixed connection between the second heating element 500 and the heat conducting plate 221. Of course, the second heating element 500 can also be fixed to the heat conducting plate 221 in other ways, such as snap-on fixation, magnetic fixation, etc.

[0067] For further reference, Figure 6 The outer periphery of the heat insulating member 540 is provided with a heat insulating sealing portion 541, and the heat insulating sealing portion 541 is arranged around the outer periphery of the positioning protrusion 223. In this way, while having a certain heat insulating function, the gap between the water shield 400 and the positioning protrusion 223 can also be offset, thereby increasing the sealing of the superheating chamber 130 and preventing the water in the water tank 210 from entering the superheating chamber 130 and causing the temperature of the superheating chamber to drop.

[0068] In some embodiments of the present invention, reference Figure 2 , Figure 4 , Figure 5 and Figure 6 The top of the water-proof cover 400 is provided with a steam inlet 401 connecting the evaporation chamber 120 and the air inlet channel 131 and a superheated steam outlet 402 connecting the air outlet channel 132 and the cooking chamber 110, and the upper end of the heat-conducting cover 600 abuts against the inner wall of the water-proof cover 400 between the steam inlet 401 and the superheated steam outlet 402. In this way, the gap between the two can be eliminated, and the steam entering from the steam inlet 401 can be prevented from directly flowing out from the superheated steam outlet 402 without being heated by the heat-conducting cover 600 and the second heating element 500, so that the steam can flow from the steam inlet 401 through the air inlet channel 131 and the air outlet channel 132 according to a predetermined path and then flow out from the superheated steam outlet 402, thereby ensuring the effect of the steam being fully heated.

[0069] In some embodiments of the present invention, reference Figure 2 , Figure 4 and Figure 5 The top of the heat transfer element 510 is provided with a protrusion 513 arranged toward the superheated steam outlet 402 , and the upper end of the heat conductive cover 600 is provided with a guide portion 610 extending toward the protrusion 513 .

[0070] The guide portion 610 can guide the superheated steam in the small space heating channels formed by the heat transfer protrusions 511 in an orderly and concentrated manner to the superheated steam outlet 402, which is beneficial to improving the air intake efficiency of the superheated steam into the cooking cavity, so that the superheated steam can efficiently flow into the cooking cavity, and the protrusions 513 can further heat the superheated steam in the process of flowing to the superheated steam outlet 402, thereby further increasing the temperature and dryness of the steam and improving the effect of high-temperature rapid steaming.

[0071] Optionally, in some alternative embodiments of the present invention, a groove may also be provided on the top of the heat transfer element 510 to accommodate condensed water dripping from the superheated steam outlet 402, so as to prevent excessive accumulation at the bottom of the superheat chamber 130 and affect the heating effect of the steam.

[0072] In some embodiments of the present invention, the surface of the second heating element 500 is coated with a food-grade coating or the surface of the second heating element 500 is provided with a food-grade oxidation layer.

[0073] Specifically, the second heating element 500 includes a heat transfer element 510 and a heating element 520 disposed inside the heat transfer element 510 , and the surface of the heat transfer element 510 is coated with a food-grade coating or the surface of the heat transfer element 510 is provided with a food-grade oxidation layer.

[0074] This not only improves the safety of the steam cooking appliance, but also avoids corrosion damage to the second heating element 500 caused by steam, thereby increasing the service life of the second heating element 500. It also makes the second heating element 500 easier to maintain. The user only needs to rinse it with water or simply wipe the surface of the heat transfer element 510 when it needs to be cleaned, thereby improving the user experience.

[0075] Optionally, a coating or an oxide layer is also provided on the surface of the heat conductive cover 600 and / or the water-proof cover 400 .

[0076] In a preferred embodiment, referring to Figure 1 The steam cooking device is a cooking device such as an electric steamer, and includes a base 200 and a pot body 300 disposed on the base 200, a water tank 210 disposed on the base 200, and a juice receiving tray 310 disposed on the pot body 300. The juice receiving tray 310 and the water tank 210 enclose an evaporation chamber 110, and a first heating element 220 is disposed at the lower part of the evaporation chamber 110. The pot body 300 is provided with at least one steaming layer 320, and the steaming layer 320 forms a cooking chamber 100. When steam cooking, food is placed in the steaming layer 320, and a proper amount of water is filled in the water tank 210. The first heating element 220 heats the water in the evaporation chamber 110 to generate steam, and the steam enters the air outlet channel 132 through the air inlet channel 131 and is heated by the heat conductive cover 600 and the second heating element 500 in the process to form superheated steam, and finally enters the pot body 300 to cook the food in the steaming layer 320.

[0077] The present application does not specifically limit the form of the evaporation chamber 110. Preferably, refer to Figure 1A downwardly extending water barrier 313 is provided at the bottom of the juice receiving tray 310, and the bottom end of the water barrier 313 extends to the bottom of the water tank 210 so that the water barrier 313 is inserted into the water, thereby forming a relatively closed evaporation chamber 110, preventing steam from diffusing outward, making the generated steam more concentrated, and forming a water replenishment chamber 120 outside the evaporation chamber 110 for replenishing water to the evaporation chamber.

[0078] Optional, see Figure 1 The inner wall of the water tank 210 is provided with a bypass rib 211, which is arranged on the outside or inside of the water-isolating rib 313, so as to form a water replenishment buffer zone, so that the colder water in the water replenishment chamber 120 cannot directly enter the heating area of ​​the first heating element 220, and avoids direct mixing with the hotter water in the area to cause the water temperature to drop, thereby ensuring the temperature in the heating area, so that the water in the heating area can boil and generate steam in a short time, thereby improving the steam generation rate and cooking efficiency.

[0079] Of course, the water-blocking ribs 313 and the spoiler ribs 211 may not be provided, so that other areas outside the water-blocking cover 400 directly form the evaporation chamber 110 .

[0080] The present application does not limit the location of the first heating element 220. Preferably, the bottom of the evaporation chamber 110 is provided with a avoidance opening corresponding to the first heating element 220. The first heating element 220 is arranged at the avoidance opening and is sealed and connected to the water tank 210. The top wall of the first heating element 220 and the inner wall of the water tank 210 together form the evaporation chamber 110, so that the water in the evaporation chamber 110 directly contacts the first heating element 220, thereby improving the heating efficiency of the first heating element 220, and further improving the steam generation efficiency. It is understandable that the first heating element 220 can also be arranged on the outside of the bottom wall of the water tank 210 to heat the water in the evaporation chamber 110 by heat transfer, or the first heating element 220 can be directly arranged inside the water tank 210 to directly heat the water.

[0081] It should be noted that the above embodiment is described using an electric steam cooker as the steam cooking utensil. It can be understood that the steam cooking utensil in the embodiment of the present invention can be any cooking utensil that can use steam for cooking or auxiliary heating, such as an air fryer, an electric stew pot, a steam oven, etc., and is not limited here.

[0082] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A high-temperature steam cooking appliance, wherein a cooking cavity and a water tank are provided inside the steam cooking appliance, characterized in that: A water-proof cover and a first heating element are provided in the water tank. The water-proof cover divides the water tank into an evaporation chamber located outside the water-proof cover and an overheating chamber located inside the water-proof cover. The first heating element is used to heat the evaporation chamber to generate steam. A second heating element and a heat-conducting cover are provided in the overheating chamber. The second heating element is protrudingly provided in the heat-conducting cover and is used to heat the steam and the heat-conducting cover. The heat-conducting cover is provided between the water-proof cover and the second heating element to divide the overheating chamber into an air inlet channel and an air outlet channel.

2. The high temperature steam cooking appliance according to claim 1, characterized in that: The second heating element comprises a heat transfer element and a heating element arranged inside the heat transfer element. The outer surface of the heat transfer element is provided with at least two heat transfer protrusions protruding outward, and the heat conductive cover is sleeved on the heat transfer protrusions.

3. The high temperature steam cooking appliance according to claim 2, characterized in that: The heat transfer protrusions are vertically or obliquely extended in the up-down direction to form a steam flow channel between the heat conductive cover and two adjacent heat transfer protrusions.

4. The high temperature steam cooking appliance according to claim 1, characterized in that: The second heating element includes a heat transfer element and a heating element arranged inside the heat transfer element, a plurality of support blocks are arranged at the lower part of the heat transfer element, the heat conductive cover is supported on the support blocks, and an air port connecting the air inlet channel and the air outlet channel is formed between adjacent support blocks; or, an air port connecting the air inlet channel and the air outlet channel is opened at the bottom of the heat conductive cover.

5. The high temperature steam cooking appliance according to claim 1, characterized in that: The air inlet channel is formed between the heat-conducting cover and the water-proof cover, and the air outlet channel is formed between the second heating element and the heat-conducting cover.

6. The high temperature steam cooking appliance according to claim 1, characterized in that: The first heating element comprises a heat conducting plate and a heating tube for heating the heat conducting plate, and the water-proof cover and the second heating element are arranged on the heat conducting plate.

7. The high temperature steam cooking appliance according to claim 6, characterized in that: The heat conducting plate has a positioning protrusion which protrudes upward and is used for arranging the second heating element, and the water-proof cover is sleeved on the positioning protrusion.

8. The steam cooking appliance according to claim 6, characterized in that: A mounting platform is provided at the bottom of the second heating element, and the steam cooking appliance further comprises a heat insulating element, which is sandwiched between the mounting platform and the heat conducting plate.

9. The high temperature steam cooking appliance according to claim 1, characterized in that: The water-proof cover is provided with a steam inlet connecting the evaporation chamber and the air inlet channel and a superheated steam outlet connecting the air outlet channel and the cooking chamber. The upper end of the heat-conducting cover abuts against the inner wall of the water-proof cover between the steam inlet and the superheated steam outlet.

10. The high temperature steam cooking appliance according to claim 1, characterized in that: The surface of the second heating element is coated with a food-grade coating or the surface of the second heating element is provided with a food-grade oxidation layer.

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