Cast iron pan subjected to oxygen-nitrogen composite treatment without coating
By incorporating capillary structures and phase change materials within the cast iron pot, combined with zoned heating technology, the problem of uneven heat conduction in cast iron pots in rice cookers is solved, achieving uniform heating of the cast iron pot and simultaneous cooking of rice.
Patent Information
- Application Number
- CN202423268717.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-30
AI Technical Summary
When existing inner pots are used in rice cookers, their poor heat conduction makes it impossible to meet the different heat requirements of the bottom and edges of the inner pot during cooking, resulting in the rice at the bottom being overheated and burnt, while the rice at the edges is undercooked.
The cast iron pot, which is treated with an uncoated oxygen-nitrogen composite coating, achieves zoned heating of the bottom and edges by setting a capillary structure and filling it with phase change material in the temperature uniform cylinder, and by setting electromagnetic induction heating coils in different parts of the heating plate. Combined with the regulator to dynamically adjust the pressure to optimize heat transfer.
It achieves even heating of the cast iron pot, prevents rice from sticking to the bottom and burning, ensures that the whole pot of rice cooks at the same time, and improves the cooking effect.
Smart Images
Figure CN223640525U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to cast -iron pot technical field, especially in no coating oxygen nitrogen composite processing's cast -iron pot. BACKGROUND
[0002] Cast -iron pot has unique heat conduction characteristics, its internal structure is relatively uniform, heat can spread in the pot quickly and stably, as the inner container in the electric rice cooker, in the heat preservation stage after cooking, cast -iron pot can utilize the heat stored by itself, make rice keep warm in a long time, and will not cause temperature fluctuation too much because of the intermittent heating of the electric rice cooker, influence the taste and quality of rice.
[0003] At present, the existing inner container pot uses single material when using in the electric rice cooker, such as common aluminum alloy, because the uniformity of the heat conduction of the pot is poor, the different heat demand of the inner container bottom and edge in the cooking process cannot be met, when cooking, the bottom aluminum alloy material quickly conducts heat and makes the bottom rice rapidly heat up, the water evaporates quickly, which may cause the bottom rice to stick to the pot and scorch, and the edge rice is still undercooked because of slow heat conduction, and cannot be cooked synchronously, therefore, the application provides a cast -iron pot without coating oxygen nitrogen composite processing to meet the demand. UTILITARIAN CONTENT
[0004] The technical problem to be solved by the utility model is to provide a cast -iron pot without coating oxygen nitrogen composite processing to solve the problem that the existing inner container pot cannot meet the different heat demand of the inner container bottom and edge in the cooking process because the uniformity of the heat conduction of the pot is poor when using in the electric rice cooker.
[0005] To solve the above technical problem, the utility model provides the following technical scheme.
[0006] A cast -iron pot without coating oxygen nitrogen composite processing, comprising: an electric rice cooker body, a heating disc arranged at the bottom of the inner cavity of the electric rice cooker body, a temperature equalizing cylinder arranged in the electric rice cooker body and located at the top of the heating disc, and a cast -iron pot body movably arranged in the temperature equalizing cylinder, wherein the cast -iron pot body is subjected to no coating oxygen nitrogen composite processing, the temperature equalizing cylinder is provided with capillary structures and filled with phase change materials, the temperature equalizing cylinder is made of heat transfer material, and the temperature equalizing cylinder comprises a bottom and an edge portion, and the heat conductivity coefficient of the bottom is less than that of the edge portion.
[0007] The heating disc comprises an edge portion body, a partition layer and a center portion, and the edge portion body and the center portion are separated by the partition layer.
[0008] The partition layer is made of high-temperature-resistant heat insulation material and is used for reducing the mutual influence of heat between the center portion and the edge portion body.
[0009] An electromagnetic induction heating coil is provided inside the edge portion body to rapidly increase the temperature of the edge portion body.
[0010] An auxiliary electromagnetic induction heating coil is provided in the central part to provide supplemental heat to the bottom of the temperature equalization cylinder.
[0011] The capillary structure at the edge of the heat exchanger is dense and has relatively large pores, while the capillary structure at the bottom of the heat exchanger is relatively sparse and has relatively fine pores, in order to adapt to the heat transfer requirements of different parts of the heat exchanger.
[0012] It also includes: a regulator, which is disposed inside the rice cooker body and connected to the temperature equalization cylinder, for adjusting the pressure inside the temperature equalization cylinder.
[0013] Compared with the prior art, this utility model has at least the following beneficial effects.
[0014] In the above scheme, by setting up a heat equalization cylinder, the heat transfer coefficients of the bottom and the edge are different. The heat transfer coefficient of the bottom is small and the heat transfer coefficient of the edge is large. This design can make the heat transfer from the edge to the bottom more rationally, and prevent the rice at the bottom from burning due to overheating. Furthermore, the capillary structure and the phase change material filling further enhance the uniformity of heat conduction, ensuring that the entire cast iron pot can be heated evenly.
[0015] By setting up a heating plate and separating the edge part from the center part through a partition, the edge part has an electromagnetic induction heating coil built in. At the beginning of cooking, the edge part of the heat spreader immediately obtains sufficient heat and transfers it to the edge of the cast iron pot, causing the rice at the edge to heat up quickly and be heated at the same time as the rice at the bottom. The auxiliary electromagnetic induction heating coil in the center provides additional heat to the bottom of the heat spreader as needed. This allows for flexible distribution of heat between the bottom and the edge, preventing the rice at the bottom from sticking to the pot or burning, and ensuring that the rice in the whole pot is cooked evenly. Attached Figure Description
[0016] Figure 1 A schematic diagram of a cast iron pot with uncoated oxygen-nitrogen composite treatment.
[0017] Figure 2 This is a cross-sectional view of the main body structure of the rice cooker.
[0018] Figure 3 This is a schematic diagram of a cast iron pot.
[0019] Figure 4 This is a partial schematic diagram of the capillary structure.
[0020] Figure 5 This is a schematic diagram of the heating plate structure.
[0021] [Figure Labels]
[0022] 1. Rice cooker body; 2. Cast iron pot body; 3. Temperature distribution cylinder; 4. Heating plate; 5. Regulator; 31. Capillary structure; 41. Edge body; 42. Divider; 43. Center.
[0023] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation
[0024] The following is a detailed description of a cast iron pot with uncoated oxygen-nitrogen composite treatment provided by this utility model, in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.
[0025] like Figure 1 - Figure 5 As shown, an embodiment of this utility model provides a cast iron pot with uncoated oxygen-nitrogen composite treatment, including: a rice cooker body 1; a heating plate 4 disposed at the bottom of the inner cavity of the rice cooker body 1; a temperature equalization cylinder 3 disposed inside the rice cooker body 1 and located at the top of the heating plate 4; a cast iron pot body 2 movably disposed inside the temperature equalization cylinder 3, the cast iron pot body 2 being treated with uncoated oxygen-nitrogen composite; a capillary structure 31 being disposed inside the temperature equalization cylinder 3 and filled with a phase change material; the temperature equalization cylinder 3 being made of a heat transfer material, the temperature equalization cylinder 3 including: a bottom and an edge, the thermal conductivity of the bottom being less than that of the edge.
[0026] The phase change material can be ethanol, acetone, or water; the temperature equalizer 3 typically uses a low thermal conductivity ceramic matrix composite material or a specific aluminum alloy for the bottom, while the edge tends to use a high thermal conductivity material, such as pure copper or a copper alloy with high copper content. In the initial heating stage, the electromagnetic induction heating coil inside the edge body 41 of the heating plate 4 works. Due to the high thermal conductivity of the material at the edge of the temperature equalizer 3, heat is quickly transferred, allowing the rice near the edge to heat up rapidly and initiate the initial cooking steps such as water absorption. At the bottom, due to its low thermal conductivity, heat penetrates slowly, preventing the rice at the bottom from sticking to the pot or burning due to instantaneous high temperature. As cooking progresses, the auxiliary electromagnetic induction heating coil inside the center 43 intervenes, and the heat from the bottom is replenished in an orderly manner, working together with the heat from the edge body 41 to conduct evenly to the bottom.
[0027] The heating plate 4 includes an edge body 41, a partition 42, and a center part 43, with the edge body 41 and the center part 43 separated by the partition 42. The heating plate 4 can be powered by an external power source.
[0028] The partition 42 is made of high-temperature resistant heat-insulating material to reduce the mutual heat influence between the central part 43 and the edge body 41. The partition 42 can be composed of ceramic fiber material, aerogel material, or high-temperature heat-insulating felt, etc. The partition 42 can prevent excessive heat from the edge body 41 from being conducted to the central part 43, so that the electromagnetic induction heating coil of the edge body 41 can efficiently and quickly heat the edge of the heat-equalizing cylinder 3 without being disturbed by the heating situation of the central part 43.
[0029] An electromagnetic induction heating coil is installed inside the edge body 41 to quickly raise the temperature of the edge body 41. Electromagnetic induction heating utilizes the principle of generating an induced current in a conductor using an alternating magnetic field, thereby heating the conductor. When the alternating current passes through the electromagnetic induction heating coil, an alternating magnetic field is generated around the coil. A conductor in this magnetic field, such as the temperature equalization cylinder 3, will generate eddy currents due to electromagnetic induction. When the eddy currents flow inside the conductor, they overcome resistance and generate Joule heat, thereby heating the object.
[0030] An auxiliary electromagnetic induction heating coil is provided inside the central part 43 to provide supplemental heat to the bottom of the temperature equalization cylinder 3. By setting up the auxiliary electromagnetic induction heating coil, which operates on a similar principle to the electromagnetic induction heating coil, the function of zoned heating is achieved. The auxiliary electromagnetic induction heating coil and the electromagnetic induction heating coil are electrically connected to the regulator 5.
[0031] The capillary structure 31 at the edge of the heat exchanger 3 is dense and has relatively large pores, while the capillary structure 31 at the bottom of the heat exchanger 3 is relatively sparse and has relatively fine pores, which is used to adapt to the heat transfer requirements of different parts of the heat exchanger 3. In the initial stage of heat transfer, when the edge body 41 of the heating plate 4 heats up rapidly and heat rushes into the edge of the heat exchanger 3, the dense pores provide a larger contact area, allowing the phase change material filled in, such as paraffin or water, to absorb heat more efficiently. When the bottom receives supplemental heat from the center 43 of the heating plate 4, if salt hydrates are used as the phase change material, the fine pores can finely control its phase change process, allowing the phase change material to circulate slowly and stably, releasing the stored heat at a stable rate, and ensuring that the bottom temperature rises steadily.
[0032] It also includes: a regulator 5, which is installed inside the rice cooker body 1 and connected to the heating cylinder 3, for regulating the pressure inside the heating cylinder 3. The regulator 5 controls the pressure inside the heating cylinder 3. When the pressure inside the heating cylinder 3 increases, the boiling point of the phase change material will increase, and its phase change process will be inhibited or delayed, thereby affecting the speed and direction of heat transfer. Conversely, when the pressure decreases, the phase change material is more likely to undergo phase change, and the heat transfer speed may be accelerated. The regulator 5 includes a pressure sensor to monitor the pressure inside the heating cylinder 3 in real time. The controller unit receives the electrical signal from the pressure sensor, compares it with the preset pressure value, and controls the operation of the auxiliary electromagnetic induction heating coil and the electromagnetic induction heating coil, as well as the air inlet valve, the air outlet valve, the connection port, and the pipe.
[0033] The technical solution provided by this utility model, in the initial stage of cooking, the heating plate 4 starts to operate, and the electromagnetic induction heating coil in the edge body 41 generates heat. Since the edge body of the temperature equalization cylinder 3 is in close contact with the edge body 41 of the heating plate 4, the edge of the temperature equalization cylinder 3 receives heat from the edge body 41 of the heating plate 4. When the heat is transferred to the edge of the temperature equalization cylinder 3, the phase change material filled therein absorbs heat and undergoes a phase change, for example, from liquid to gas. Due to the porosity of the capillary structure 31, the gaseous phase change material can circulate rapidly in the capillary structure 31 of the edge body 41, rapidly diffusing the heat, so that the edge body 41 can be heated quickly and evenly. Then, the heat is conducted from the edge of the temperature equalization cylinder 3 to the bottom; as cooking progresses... When it is necessary to further increase the bottom temperature or maintain a stable bottom temperature, the auxiliary electromagnetic induction heating coil in the center 43 generates heat. Because the bottom of the heat spreader 3 is in close contact with the center 43 of the heating plate 4, the bottom of the heat spreader 3 receives heat from the center 43 of the heating plate 4. The operating principle of the phase change material in the bottom of the heat spreader 3 is similar to that in the edge part. However, because its capillary structure 31 is relatively sparse and has fine pores, the circulation speed of the phase change material is relatively slow, and the heat transfer is more stable and uniform. Through the regulator 5, during the cooking process, according to the type of cooking ingredients, the cooking stage and the temperature distribution in the pot, the regulator 5 can dynamically adjust the pressure in the heat spreader 3 to further optimize the heat transfer process in the heat spreader 3 and to the cast iron pot.
[0034] The uncoated oxygen-nitrogen composite treated cast iron pot of this utility model adopts the following process: 1. Abandoning the commonly used thin aluminum and steel plates on the market, A-type HT250 gray cast iron is selected. The flake graphite inside the cast iron is evenly distributed without direction, making the pot heat more evenly.
[0035] 2. After high-temperature nitriding, the pot undergoes an oxidation composite treatment to form a dense oxide film and compound layer on its surface, eliminating the need for further surface coating treatment.
[0036] The uncoated oxygen-nitrogen composite treated cast iron pot of this utility model adopts the following technical indicators: 1. Surface hardness ≥600HV.
[0037] 2. Neutral salt spray test ≥72H, naked test.
[0038] The uncoated oxygen-nitrogen composite treatment cast iron pot of this invention has the following characteristics: after nitrogen-oxygen composite treatment, a dense oxide film and compound layer are formed on the surface of the pot, which improves the surface wear resistance and corrosion resistance of the pot, without the need for an additional coating.
[0039] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art can fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits have not been described in detail.
[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A cast iron pot with uncoated oxygen-nitrogen composite treatment, characterized in that, include: Rice cooker body (1); A heating plate (4) is disposed at the bottom of the inner cavity of the rice cooker body (1); A temperature equalization cylinder (3) is disposed inside the rice cooker body (1) and located on top of the heating plate (4); The cast iron pot body (2) is movably disposed inside the temperature equalization cylinder (3), and the cast iron pot body (2) is treated with uncoated oxygen-nitrogen composite coating. The temperature equalization cylinder (3) is provided with a capillary structure (31) and filled with a phase change material; The temperature equalization cylinder (3) is made of heat transfer material. The temperature equalization cylinder (3) includes a bottom and an edge, and the thermal conductivity of the bottom is less than that of the edge.
2. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 1, characterized in that, The heating plate (4) includes: an edge body (41), a partition (42) and a center part (43), wherein the edge body (41) and the center part (43) are separated by the partition (42).
3. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 2, characterized in that, The partition (42) is made of high-temperature resistant heat insulation material to reduce the heat interaction between the central part (43) and the edge body (41).
4. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 2, characterized in that, The edge body (41) is provided with an electromagnetic induction heating coil for rapidly increasing the temperature of the edge body (41).
5. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 2, characterized in that, An auxiliary electromagnetic induction heating coil is provided in the central part (43) to provide supplemental heat to the bottom of the temperature equalization cylinder (3).
6. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 1, characterized in that, The capillary structure (31) inside the edge of the heat exchange cylinder (3) is dense and has relatively large pores, while the capillary structure (31) at the bottom of the heat exchange cylinder (3) is relatively sparse and has relatively fine pores, in order to adapt to the heat transfer requirements of different parts of the heat exchange cylinder (3).
7. The uncoated oxygen-nitrogen composite treated cast iron pot according to claim 1, characterized in that, Also includes: A regulator (5) is installed inside the rice cooker body (1) and connected to the temperature equalization cylinder (3) for adjusting the pressure inside the temperature equalization cylinder (3).