Heat storage baking tray and cooking equipment

Abstract

The utility model discloses a heat storage baking tray and cooking equipment, and the heat storage baking tray comprises a shell which is of a closed hollow structure; a cavity with a preset volume is formed in the shell, the cavity is filled with a phase change material, and the phase change material filled in the cavity is in contact with the inner wall of the shell; the volume of the phase change material filled in the shell is smaller than or equal to the volume of the cavity, the heat storage baking tray can transfer heat energy of the shell into the phase change material in the heating process, and the heat energy in the phase change material can be transferred to the shell when the heat storage baking tray is used for baking food. According to the heat storage baking tray, when the heat storage baking tray is used for cooking, constant-temperature accurate cooking can be conducted on food materials, so that the cooking efficiency, the cooking taste and the like can be effectively improved, in addition, the heat exchange effect of the heat storage baking tray can be improved, the deformation resistance of the heat storage baking tray can be improved, and the service life of the heat storage baking tray can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of household appliances, especially relates to a heat storage baking tray and cooking equipment. BACKGROUND

[0002] The existing cooking equipment, such as electric oven or steam oven, is provided with a cavity for cooking food, and a heating rod is installed on the top and / or bottom of the cavity. A tray / baking tray for holding food is arranged in the cavity. When using, the food is placed on the tray / baking tray, and the cooking equipment is started to complete the cooking of the food.

[0003] The applicant finds that the current cooking equipment, especially the electric oven or steam oven with a heating rod arranged only on the upper part and without a heating rod arranged on the lower part, has a series of problems in the process of baking food, which affects the user's experience or cannot better meet the user's use requirement.

[0004] Therefore, it is necessary to provide a heat storage baking tray and cooking equipment to solve at least one of the above problems. SUMMARY

[0005] In view of the defects of the prior art, the utility model provides a heat storage baking tray and cooking equipment. The heat storage baking tray can accurately cook food at a constant temperature during cooking, thereby effectively improving the cooking efficiency and taste.

[0006] The specific technical scheme of the utility model is as follows:

[0007] A heat storage baking tray comprises a shell, which is a closed hollow structure; a cavity with a predetermined volume is formed in the shell, and a phase change material is filled in the cavity; the phase change material filled in the cavity is in contact with the inner wall of the shell; the volume of the phase change material filled in the shell is less than or equal to the volume of the cavity; the heat energy of the shell can be transferred to the phase change material during heating, and the heat energy in the phase change material can be transferred to the shell when the heat storage baking tray is used to bake food.

[0008] In a preferred embodiment, the heat storage baking tray further comprises a heat-conducting structure, which can transfer heat energy with the shell; the heat-conducting structure at least partially extends into the phase change material and is in contact with the phase change material.

[0009] In a preferred embodiment, the heat-conducting structure is part of the shell, or the heat-conducting structure is sealingly connected with the shell.

[0010] In a preferred embodiment, the heat-conducting structure is a part of the housing, the housing comprising a top wall and a bottom wall arranged oppositely, the heat-conducting structure being punched through the top wall and / or the bottom wall, or the heat-conducting structure being integrally formed with the top wall and / or the bottom wall.

[0011] In a preferred embodiment, the heat-conducting structure comprises at least one groove arranged from the top wall to the bottom wall side, the bottom of the groove being in contact with the bottom wall.

[0012] In a preferred embodiment, the heat-conducting structure comprises at least one groove arranged from the top wall to the bottom wall side and at least one boss arranged from the bottom wall to the top wall side, the bottom of the groove being in contact with the top of the boss.

[0013] In a preferred embodiment, the heat-conducting structure comprises at least one boss formed from the bottom wall to the top wall side, the top of the boss being in contact with the top wall.

[0014] In a preferred embodiment, the top of the boss and the top wall are in surface contact.

[0015] In a preferred embodiment, the top wall has at least a part of its upper surface used to form a cooking surface, the cooking surface being in a planar configuration, the boss being opposite to the cooking surface.

[0016] In a preferred embodiment, the material of the heat-conducting structure comprises any one or a combination of the following: metal, ceramic, graphite.

[0017] In a preferred embodiment, the material of the heat-conducting structure comprises a metal material, the top of the boss and the top wall being welded.

[0018] In a preferred embodiment, the profile of the cross section of the boss comprises any one or a combination of the following: circular, quasi-circular, elliptical, quasi-elliptical.

[0019] In a preferred embodiment, the number of the bosses is multiple, the multiple bosses being evenly distributed along the bottom wall.

[0020] In a preferred embodiment, the ratio of the surface area of the boss to the surface area of the bottom wall is between 2% and 90%.

[0021] In a preferred embodiment, the ratio of the depth of the boss to the maximum length in the transverse direction is between 0.1 and 0.7.

[0022] In a preferred embodiment, the shell comprises a top wall and a bottom wall arranged oppositely, and the phase change material filled in the cavity is in contact with the top wall or has a predetermined gap between the phase change material and the top wall.

[0023] In a preferred embodiment, the predetermined gap is filled with air.

[0024] In a preferred embodiment, the shell further comprises at least one flared structure, and a predetermined space is formed inside the flared structure and communicates with the cavity, and the predetermined space is not pre-filled with phase change material or is partially filled with phase change material.

[0025] In a preferred embodiment, the predetermined space of the flared structure is at least partially higher than the cavity.

[0026] In a preferred embodiment, the flared structure comprises at least one holding portion.

[0027] In a preferred embodiment, the heat storage baking tray comprises opposite left and right sides, and the number of holding portions is two, which are arranged on the left and right sides of the heat storage baking tray, respectively.

[0028] In a preferred embodiment, the cavity in the holding portion has a volume at least greater than 1% of the volume of the phase change material.

[0029] In a preferred embodiment, the shell comprises an upper shell and a lower shell, the upper shell is connected with the lower shell, the cavity is formed by cooperation of the upper shell and the lower shell, and the upper shell or the lower shell is provided with a communication hole communicating with the flared structure.

[0030] In a preferred embodiment, the communication hole can be used as a hole for injecting the phase change material.

[0031] In a preferred embodiment, the shell is a disc body of the baking tray.

[0032] In a preferred embodiment, the shell comprises an upper shell and a lower shell, the upper shell is connected with the lower shell, and the cavity is a closed cavity formed by cooperation of the upper shell and the lower shell.

[0033] In a preferred embodiment, the upper shell is provided with a first flange facing the lower shell, the lower shell is provided with a second flange facing the upper shell, and the first flange and the second flange are adaptively connected.

[0034] In a preferred embodiment, the first flange is wrapped outside the second flange, and the first flange and the second flange are sealingly fixed.

[0035] In a preferred embodiment, the outer periphery of the upper shell is provided with a first bending part, and the outer periphery of the lower shell is provided with a second bending part, and the outer side of the first bending part is sealingly fixed with the inner side of the second bending part.

[0036] In a preferred embodiment, the baking tray further comprises a tray body, and the shell is attached to the bottom surface of the tray body.

[0037] In a preferred embodiment, the shell is detachably connected or fixedly connected with the tray body.

[0038] In a preferred embodiment, the phase change point temperature of the phase change material is 80-230 DEG C.

[0039] A cooking device having a function of baking food, comprising the heat accumulating baking tray as claimed in any one of the preceding claims.

[0040] In a preferred embodiment, the cooking device further comprises an inner container and a heating assembly arranged at the upper portion of the inner container, and the cooking device has a first working state and a second working state, in the first working state, the heating assembly heats the shell, and the heat released by the heating assembly is transferred to the phase change material through the shell; in the second working state, the heat in the phase change material is transferred to the shell.

[0041] The technical scheme of the utility model has the following remarkable beneficial effects:

[0042] The heat accumulating baking tray provided in the embodiment of the application is provided with a hollow shell, the shell is filled with phase change material, the volume of the phase change material is less than the volume of the inner cavity of the shell, so that the shell has the expansion space required when the phase change material changes phase, or when the volume of the phase change material is equal to the volume of the inner cavity of the shell, the expansion space required when the phase change material changes phase is provided by the outward expansion structure, the heat energy of the shell can be transferred to the phase change material during the heating process of the heat accumulating baking tray, and the heat energy in the phase change material can be transferred to the shell when the heat accumulating baking tray is used to bake food, as a whole, compared with the method of directly cooking food by hot air, the heat accumulating baking tray is used for heat accumulation and constant temperature and accurate cooking of food, so that the cooking efficiency and the cooking taste can be effectively improved.

[0043] Further, by setting the heat conduction structure capable of heat transfer with the shell, the heat conduction structure at least partially extends into the phase change material filled in the shell and is in contact with the phase change material, compared with the direct heat transfer between the shell and the phase change material without the heat conduction structure, the heat conduction structure can at least be used to increase the contact area and the number of contact positions between the phase change material and the shell, so as to improve the heat transfer efficiency and uniformity between the phase change material and the shell, and achieve a better heat exchange effect.

[0044] When the heat conduction structure is located between the top wall and the bottom wall of the shell, the heat conduction structure can be used to form a reinforcing structure between the top wall and the bottom wall, thereby improving the overall strength of the shell. In particular, for the shell with a closed cavity formed inside, since the phase change material injected into the cavity of the shell will expand and contract during use, causing the internal pressure of the cavity to change between positive pressure and negative pressure. By setting the heat conduction structure, the ability of the shell to resist deformation can be provided, thereby prolonging the service life of the shell.

[0045] For the cooking equipment with the heating assembly arranged only on the upper part of the inner container, the improved scheme provided in the embodiments of the present application can preset different cooking parameters of the heat storage grill for different cooking requirements by combining the application of the heat storage grill, so as to meet different thickness and maturity requirements of food materials. In the baking stage, the lower surface of the food material cooked by the heat storage grill is uniformly and constantly heated by cooperating with the heating assembly on the upper part, which can effectively shorten the cooking time, save the user's operation of turning over the food material multiple times in the middle of cooking, and cook the food material to meet the specific taste requirements of the user, thereby preferably improving the user experience.

[0046] Specific embodiments of the present application are disclosed in detail in the following description and accompanying drawings, indicating the principles of the present application that can be used. It should be understood that the embodiments of the present application are not limited in scope in this regard. Embodiments of the present application include many changes, modifications and equivalents within the spirit and scope of the appended claims. Features described and / or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with other features in other embodiments, or instead of other features in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0047] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way. Additionally, the shapes and proportions of the various components depicted in the drawings are not intended to be limiting, and the dimensions of the various components depicted in the drawings are not intended to be limiting. Those skilled in the art will recognize that various modifications can be made to the shapes and proportions of the various components depicted in the drawings, and that the dimensions of the various components depicted in the drawings can be varied, as necessary, to achieve the desired results.

[0048] Figure 1 A structure diagram of a heat accumulating grill provided in an embodiment of the present application;

[0049] Figure 2 A front view of the heat accumulating grill provided in the embodiment of the present application;

[0050] Figure 3 A top view of the heat accumulating grill provided in the embodiment of the present application;

[0051] Figure 4 A bottom view of the heat accumulating grill provided in the embodiment of the present application;

[0052] Figure 5 A Figure 4 sectional view at A-A in FIG. 1;

[0053] Figure 6 A Figure 5 enlarged view of a portion II in FIG. 1;

[0054] Figure 7 A structure diagram of another heat accumulating grill provided in an embodiment of the present application;

[0055] Figure 8 A front view of the heat accumulating grill provided in the embodiment of the present application;

[0056] Figure 9 A top view of the heat accumulating grill provided in the embodiment of the present application;

[0057] Figure 10 A bottom view of the heat accumulating grill provided in the embodiment of the present application;

[0058] Figure 11 A Figure 10 sectional view at B-B in FIG. 2;

[0059] Figure 12 A Figure 11 enlarged view of a portion II in FIG. 2;

[0060] Figure 13Fig. 1 is a graph showing temperature changes of a phase change material on a cooking surface in a heat absorption and a heat release stage in a heat storage grill provided with a heat conducting structure according to an embodiment of the present application.

[0061] Reference numerals of the present application:

[0062] 1, housing;

[0063] 101, upper housing;

[0064] 102, lower housing;

[0065] 11, top wall;

[0066] 12, bottom wall;

[0067] 120, boss;

[0068] 112, first flange;

[0069] 122, second flange;

[0070] 111, first bent portion;

[0071] 121, second bent portion;

[0072] 13, heat conducting structure;

[0073] 14, communication hole;

[0074] 2, phase change material;

[0075] 3, grip;

[0076] 30, predetermined space. DETAILED DESCRIPTION

[0077] The technical solutions of the present application will be described in detail below in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application. After reading the present application, those skilled in the art can make various equivalent modifications to the present application, and all such modifications fall within the scope of the appended claims.

[0078] It should be noted that when an element is referred to as "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0080] The utility model provides a kind of heat storage grill, cooking equipment, utilize the heat storage grill when cooking, food material can be constant temperature accurate cooking, so as to effectively improve cooking efficiency and cooking taste etc., further, it can also improve the heat exchange effect of the heat storage grill, improve the deformation resistance of heat storage grill, prolong the service life of heat storage grill etc.

[0081] Please refer to Figures 1 to 12 In the embodiments of the present application, a heat storage grill is provided, which can include: a shell 1, which is a closed hollow structure; a cavity with a predetermined volume is formed inside the shell 1, and a phase change material 2 is filled in the cavity; the phase change material 2 filled in the cavity is in contact with the inner wall of the shell 1, and the volume of the phase change material 2 filled in the shell 1 is less than or equal to the volume of the cavity; during heating, the heat energy of the shell 1 can be transferred to the phase change material 2, and when the heat storage grill is used for baking food, the heat energy in the phase change material 2 can be transferred to the shell 1.

[0082] The heat storage grill provided in the embodiments of the present application is provided with a hollow shell 1, which is filled with a phase change material 2 inside; the volume of the phase change material 2 is less than the volume of the inner cavity of the shell 1, so that the shell 1 has the expansion space required for the phase change of the phase change material 2 inside; or the volume of the phase change material is equal to the volume of the inner cavity of the shell, and the expansion space required for the phase change of the phase change material is provided by the outward expansion structure; during heating, the heat energy of the shell 1 can be transferred to the phase change material 2, and when the heat storage grill is used for baking food, the heat energy in the phase change material 2 can be transferred to the shell 1; overall, compared with the method of directly cooking food with hot air, the heat storage grill is used for heat storage, and food material is constant temperature accurate cooking, so as to effectively improve cooking efficiency and cooking taste etc.

[0083] In addition, the heat storage grill further comprises a heat conducting structure 13, which can transfer heat energy with the shell 1, and the heat conducting structure 13 at least partially extends into the phase change material 2 and contacts the phase change material. Compared with the direct heat transfer between the shell 1 and the phase change material 2 without the heat conducting structure 13, the heat conducting structure 13 can at least increase the contact area and the number of contact positions between the phase change material 2 and the shell 1, thereby improving the heat transfer efficiency and uniformity between the phase change material 2 and the shell 1, and achieving a better heat exchange effect.

[0084] In the embodiment, the heat storage grill can comprise a shell 1. The shell 1 can serve as a grill body of the heat storage grill, or the shell 1 can be detachably connected or fixedly connected with the grill body of the heat storage grill. In the embodiments of the present application and the accompanying drawings, the shell 1 is mainly taken as the grill body of the heat storage grill. Figures 1 to 12 In the embodiments, the shell 1 is mainly taken as the grill body of the heat storage grill.

[0085] In the embodiment, the shell 1 can be made of a heat conducting material, which can include any one or a combination of the following: metal, ceramic, graphite. Of course, the heat conducting material can also be a material that can directly contact food, and is not limited to the above description. Those skilled in the art can also make other changes under the inspiration of the technical essence of the present application, as long as the functions and effects achieved are the same or similar to the present application, which should be covered within the protection scope of the present application. In the embodiments of the present application, the shell 1 is mainly taken as a metal material with good heat conducting performance and convenient processing and manufacturing.

[0086] In the embodiment, the shell 1 has a hollow structure, and the inside of the shell 1 can form a cavity for filling the phase change material 2. The cavity can be a whole closed cavity. The shell 1 can be provided with an injection port for filling the phase change material 2 into the cavity, and the injection port can be provided with a plugging member. Specifically, the plugging member can be detachably connected to the injection port, or be sealed on the injection port in a non-detachable manner. Except for the addition of the phase change material 2, the plugging member always cooperates with the injection port, so that the cavity is in a closed state to prevent the phase change material 2 in the cavity from leaking outwards.

[0087] For the heat storage grill itself, another design idea is to provide a hollow interlayer cavity in the grill, which is filled with a liquid-gas phase change working medium (such as water). In use, the liquid-gas phase change working medium can be converted from a liquid state to a gaseous state when heated to the phase change temperature, and then discharged outward through the exhaust port. The grill is also provided with a liquid supplement port in communication with the hollow interlayer cavity, which is used to supplement liquid into the hollow interlayer cavity. The grill needs to confirm the volume of the liquid-gas phase change working medium before each use, and the user needs to add the liquid-gas phase change working medium in time when the volume of the liquid-gas phase change working medium is insufficient, which is not good for the overall user experience. In the embodiments of the present application, the cavity is a whole closed structure, which eliminates the steps of confirming the volume of the phase change material 2 and frequently adding the phase change material 2, and can effectively improve the user experience.

[0088] The phase change material 2 filled in the cavity has a heat absorption state and a heat release state. In the heat absorption state, the phase change material 2 can absorb the heat of the shell 1 during the heating of the heat storage grill. In the heat release state, for example, when the heat storage grill is used for cooking food, the absorbed heat can be released to the shell 1 for cooking food.

[0089] Specifically, the phase change material 2 can change the physical state with the change of temperature and can provide latent heat. Specifically, the phase change material 2 can include any one or a combination of the following materials: a material capable of solid-liquid phase change, a material capable of solid-gas phase change, or a material capable of liquid-gas phase change. The specific material of the phase change material 2 can be selected from phase change materials that meet food safety, have appropriate thermal performance, and have good stability, for example, paraffin, hydrated salt, etc. Specifically, the specific material of the phase change material 2 is not limited in the present application.

[0090] When the phase change material 2 is applied in the heat storage grill, the phase change point temperature of the phase change material 2 can be 80-230℃. When the phase change point temperature of the phase change material 2 is different in the above temperature range, the cooking requirements of different types of food materials can be better met. For the same set of cooking equipment, it can be provided with a plurality of heat storage grills, and different heat storage grills can be filled with phase change materials 2 with different phase change temperatures.

[0091] For some food materials that need to be cooked at low temperature, for example, salmon or chicken breast, which can provide high-quality protein, when the cooking temperature needs to be controlled at a lower temperature, one of the heat storage grills can select the phase change point temperature of the phase change material 2 to be between 80-100℃.

[0092] When the phase change material 2 in the heat storage grill releases heat at the above lower phase change point temperature, the nutrients in the food can be better protected, the taste of the food can be better maintained, and the degree of Maillard reaction can be reduced, thereby reducing the risk of the generation of harmful substances such as acrylamide.

[0093] For some food materials that need high-temperature cooking, for example, beef, when the cooking temperature needs to be controlled at a higher temperature, another heat storage grill can be selected to have the phase change point temperature of the phase change material 2 between 200°C and 230°C (for example, 220°C). When the phase change material 2 in the heat storage grill releases heat at the above higher phase change point temperature, only a certain Maillard reaction can be generated on the surface of the beef, thereby forming a beef taste with a surface caramelization and an internal tenderness, satisfying the user's better taste requirement for food materials.

[0094] In addition, the heat storage grill can precisely control the maturity of the food by controlling the preheating time, i.e., the heat absorption time of the phase change material 2 in the heat storage grill, thereby satisfying different user's different maturity requirements for food. The heat storage grill can be applied in a cooking device, for example, a steam oven. The steam oven can be used to preheat the heat storage grill for a predetermined time. For different food and different maturity requirements, the steam oven can be used to preheat the heat storage grill for different time.

[0095] In some embodiments, the shell 1 has a hollow structure, and at least part of the hollow part of the shell 1 is used to form the cavity for accommodating the phase change material 2. The phase change material 2 filled in the cavity is in contact with at least part of the inner wall of the shell 1.

[0096] Specifically, the hollow part of the shell 1 can be used to form the cavity for accommodating the phase change material 2. Alternatively, the hollow part of the shell 1 can be partially used to form the cavity for accommodating the phase change material 2.

[0097] In the first case, for the embodiment in which the hollow portion of the shell 1 is used entirely to form the cavity for containing the phase change material 2, the shell 1 can comprise a top wall 11 and a bottom wall 12 arranged oppositely, and the phase change material 2 filled in the cavity is in contact with the top wall 11. When the phase change material 2 is in contact with the top wall 11, the phase change material 2 in the shell 1 can be in full contact with the shell 1, in particular with the top wall 11 of the shell 1 for forming the cooking surface, and when the phase change material 2 in the shell 1 is in direct contact with the top wall 11 of the shell 1, due to the large-area full contact between the top wall 11 of the shell 1 and the phase change material 2, the phase change material 2 can quickly absorb the heat of the shell 1 in the heat absorption state during the heating of the heat storage grill, and can be quickly charged; in the heat release state, for example when the heat storage grill is used for baking food, the heat absorbed by the phase change material 2 in the heat absorption state can be efficiently released to the shell 1 for cooking food.

[0098] In the second case, for the embodiment in which the hollow portion of the shell 1 is used partially to form the cavity for containing the phase change material 2, there is a predetermined gap between the phase change material 2 and the top wall 11. In the predetermined gap, air is stored.

[0099] Considering that the thermal conductivity of air is relatively low, in order to improve the heat transfer efficiency between the phase change material 2 and the shell 1, in particular the cooking surface of the top wall 11, in the present embodiment, the heat storage grill is provided with a heat conduction structure 13 which can transfer heat energy with the shell 1.

[0100] Specifically, the heat conduction structure 13 at least partially extends into the phase change material 2 and is in contact with the phase change material 2, and the heat conduction structure 13 can increase the contact area and the contact position between the shell 1 and the phase change material 2 during the heating of the heat storage grill. Compared with the direct heat transfer between the shell and the phase change material without the heat conduction structure, since the heat conduction structure 13 can at least be used to increase the contact area and the number of contact positions between the phase change material 2 and the shell 1, the heat transfer efficiency and the uniformity of heat transfer between the phase change material 2 and the shell 1 can be improved, and thus a better heat exchange effect can be achieved.

[0101] It should be noted that for the above-mentioned first case, with the long-term use of the heat storage grill, the phase change material in the cavity of the heat storage grill continuously undergoes phase change, and the phase change material in the cavity is more or less consumed. At this time, the phase change material and the top wall 11 may not be in contact as before, and at this time, the first case will be converted into the second case. Therefore, for the above-mentioned first case, the heat conduction structure 13 also has the necessity of the above-mentioned second case, and can also produce similar technical effects as the first case.

[0102] In addition, for the case that the phase change material in the cavity of the heat accumulating grill is in contact with the top wall 11, since the heat conducting structure 13 extends into the phase change material 2, the heat exchange efficiency between the phase change material 2 and the shell 1 (especially the top wall 11 for placing food) can also be increased to a certain extent by arranging the heat conducting structure 13.

[0103] In some embodiments, the heat conducting structure 13 can be a part of the shell 1, or the heat conducting structure 13 can be sealingly connected with the shell 1.

[0104] Please refer to Figures 1 to 6 or Figures 7 to 12 In these embodiments, the heat conducting structure 13 can be a part of the shell 1. Specifically, the heat conducting structure 13 can be integrally formed with the shell 1, or the heat conducting structure 13 can be formed by the shell 1 itself. Alternatively, in other embodiments, the heat conducting structure 13 can be an independent part relative to the shell 1, and the heat conducting structure 13 can be arranged in the shell 1 by sealing connection. The sealing connection can be welding or other sealing connection.

[0105] For the above-mentioned embodiments in which the heat conducting structure 13 is a part of the shell 1, the shell 1 can include oppositely arranged top wall 11 and bottom wall 12. The heat conducting structure 13 can be formed by stamping the top wall 11 and / or the bottom wall 12, or the heat conducting structure 13 can be integrally formed with the top wall 11 and / or the bottom wall 12.

[0106] The shell 1 can include oppositely arranged top wall 11 and bottom wall 12. The top wall 11 can have a certain thickness, and has opposite first outer surface and first inner surface along the thickness direction. The bottom wall 12 can have a certain thickness, and has opposite second outer surface and second inner surface along the thickness direction. The first inner surface and the second inner surface can be used to form a cavity filled with phase change material 2.

[0107] In the present embodiment, the heat conducting structure 13 can be formed by stamping at least one of the top wall 11 and the bottom wall 12, or the heat conducting structure 13 can be integrally formed with at least one of the top wall 11 and the bottom wall 12. Of course, the specific arrangement of the heat conducting structure 13 is not limited to the above examples. In the following embodiments of the present application, the heat conducting structure 13 is mainly taken as an example of being formed by stamping on the shell 1. For stamping, especially when the shell 1 is made of metal material, the process is relatively mature, the cost is relatively low, and the yield is relatively high.

[0108] When the heat conducting structure 13 is a part of the shell 1, specifically, in one embodiment, the heat conducting structure 13 comprises at least one groove arranged from the top wall 11 to the bottom wall 12, and the bottom of the groove is in contact with the bottom wall 12. For the embodiment that the heat conducting structure 13 is arranged on the top wall 11, a plurality of grooves can be arranged on the top wall 11.

[0109] The groove has a groove bottom and a side groove wall surrounding the groove bottom, and the groove bottom of the groove is in contact with the bottom wall 12 of the shell 1. In order to increase the contact area between the groove bottom of the groove and the bottom wall 12 of the shell 1, the structure of the groove bottom can be matched with the structure of the bottom wall 12 to form a surface contact. For example, when the second inner surface of the bottom wall 12 is in a planar structure, the position of the groove bottom in contact with the second inner surface is also in a planar structure. When the second inner surface of the bottom wall 12 is in a curved structure, the position of the groove bottom in contact with the second inner surface is also in the same curved structure.

[0110] In addition, for the case that the groove bottom of the heat conducting structure 13 is in contact with the bottom wall 12 of the shell 1, the heat conducting structure 13 can be used to form a reinforcing structure between the top wall 11 and the bottom wall 12, thereby improving the overall strength of the shell 1. In particular, for the shell 1 with a closed cavity formed inside, since the phase change material 2 injected into the cavity of the shell 1 will expand and contract during use, causing the internal pressure of the cavity to change between positive pressure and negative pressure. By arranging the heat conducting structure 13, the ability of the shell 1 to resist deformation can be improved, thereby prolonging the service life of the shell 1.

[0111] In order to ensure that the groove bottom of the groove is always in contact with the bottom wall 12 during use, the groove bottom can be fixed to the bottom wall 12. For example, when the shell 1 is made of metal, the groove bottom can be fixed to the bottom wall 12 by welding. Of course, the fixing method is not limited to the above description, and other methods such as clamping can also be used. The skilled person in the art can make other changes based on the technical essence of the present application, as long as the functions and effects achieved are the same or similar to those of the present application, which are covered by the protection scope of the present application.

[0112] Alternatively, in another embodiment, the heat conducting structure 13 comprises at least one groove arranged from the top wall 11 to the bottom wall 12 and at least one protrusion 120 arranged from the bottom wall 12 to the top wall 11, and the bottom of the groove is in contact with the top of the protrusion 120.

[0113] In this embodiment, the main difference from the embodiment described above in which a groove is provided on the top wall 11 is that a boss 120 adapted to the groove on the top wall 11 is provided on the bottom wall 12 of the housing 1.

[0114] Specifically, the boss 120 may include a raised top and a side wall surrounding the raised top. The bottom of the groove on the top wall 11 can contact the raised top of the boss 120 on the bottom wall 12. In order to increase the contact area between the bottom of the groove and the raised top of the boss 120, the structure of the bottom of the groove can be adapted to the structure of the raised top of the boss 120, thereby forming a surface contact.

[0115] For example, when the bottom of the groove is planar, the top of the boss 120 is planar; when the bottom of the groove is curved, the boss 120 is also curved.

[0116] Furthermore, when the heat-conducting structure 13 contacts the boss 120 through the mating grooves, it can be used to form a reinforcing structure between the top wall 11 and the bottom wall 12, thereby improving the overall strength of the housing 1. Especially for housings 1 with enclosed cavities, the phase change material 2 injected into the cavity during use undergoes thermal expansion and contraction, causing the internal pressure of the cavity to switch between positive and negative pressure. By providing the heat-conducting structure 13, the housing 1 can be made more resistant to deformation, thus extending its service life.

[0117] To ensure that the bottom of the groove and the top of the boss 120 remain in contact during use, the bottom of the groove and the top of the boss 120 can be fixed together. Taking a metal housing 1 as an example, when the housing 1 is made of metal, the bottom of the groove and the top of the boss 120 can be fixed by welding. Of course, the fixing method is not limited to the above description; other methods are also possible, such as snap-fit ​​connections. Those skilled in the art, inspired by the technical essence of this application, may make other modifications, but as long as the achieved function and effect are the same as or similar to that of this application, they should be included within the scope of protection of this application.

[0118] like Figure 6 or Figure 12 As shown, or in another embodiment, the heat-conducting structure 13 may include at least one boss 120 formed from the bottom wall 12 toward the top wall 11, the top of the boss 120 being in contact with the top wall 11.

[0119] In the present embodiment, different from the above-mentioned embodiment in which the groove is arranged on the top wall 11, the bottom wall 12 is arranged with a boss 120, and the top of the boss 120 is arranged to contact the top wall 11. For the embodiment in which the heat conduction structure 13 is arranged on the bottom wall 12, a plurality of bosses 120 can be arranged on the bottom wall 12.

[0120] The boss 120 can include a convex top and a side convex wall surrounding the convex top. The top (convex top) of the boss 120 is arranged to contact the top wall 11. In order to increase the contact area between the top of the boss 120 and the first inner surface of the top wall 11, the structure of the top of the boss 120 can be adapted to the structure of the first inner surface of the top wall 11, so that the top of the boss 120 and the top wall 11 form a surface contact. For example, when the first inner surface of the top wall 11 is in a planar structure, the position where the top of the boss 120 contacts the first inner surface is also in a planar structure; when the first inner surface of the top wall 11 is in a curved surface structure, the position where the top of the boss 120 contacts the first inner surface of the top wall 11 is also in the same curved surface structure.

[0121] For the case in which the top of the boss 120 contacts the top wall 11 of the shell 1, the heat conduction structure 13 can be used to form a reinforcing structure between the top wall 11 and the bottom wall 12, thereby improving the overall strength of the shell 1. In particular, for the shell 1 in which a closed cavity is formed inside, since the phase change material 2 injected into the cavity of the shell 1 will expand and contract during use, causing the internal pressure of the cavity to change between positive pressure and negative pressure, by arranging the heat conduction structure 13, the ability of the shell 1 to resist deformation can be provided, thereby prolonging the service life of the shell 1.

[0122] In order to ensure that the top of the boss 120 is always in contact with the top wall 11 during use, the top of the boss 120 can be fixed to the top wall 11. Taking the shell 1 (including the heat conduction structure 13) as an example, when the shell 1 is made of metal material, the top of the boss 120 can be fixed to the top wall 11 by welding. When welding is used, the overall process is mature, and a welding structure can be formed between the heat conduction structure 13 and the shell 1 by welding, which can improve the strength of the welding position and the overall strength of the shell 1. Of course, the fixing method is not limited to the above description, and other methods such as clamping can also be used, which are not limited to the above description. Those skilled in the art can make other changes under the inspiration of the technical essence of the present application, as long as the functions and effects achieved are the same or similar to the present application, which should be covered by the protection scope of the present application.

[0123] In addition, for the above-mentioned embodiment in which the heat conduction structure 13 is a part of the shell 1, the shell 1 is a disc body of the baking tray. In this embodiment, the top wall 11 is used to contact food, i.e. the top wall 11 of the shell 1 can be used to place food, and at least a part of the upper surface (i.e. the first outer surface) of the top wall 11 is used to form a cooking surface. The cooking surface of the top wall 11 can be in a planar configuration, and the boss 120 is opposite to the cooking surface.

[0124] When the structure in which the boss 120 is formed on the bottom wall 12 of the shell 1 is in contact with the top wall 11 in a planar configuration, the structure has the least impact on the overall shell 1, and the disc body does not need to change the configuration of the cooking surface in order to arrange the heat conduction structure 13, so that the cooking surface used to contact food maintains a planar configuration. When the cooking surface is in a planar configuration, the heat storage baking tray can also be convenient to clean and contact food in a large area, achieving uniform heating.

[0125] In one embodiment, the profile of the cross section of the boss 120 includes any one or a combination of the following: circular, circular-like, elliptical, elliptical-like.

[0126] In this embodiment, the boss 120 can be formed in the form of stamping. Specifically, when the cross-sectional profile of the boss 120 is circular, circular-like, elliptical or elliptical-like, the stress can be evenly distributed on the entire profile when the structure is subjected to external force. Taking the circular shape as an example, the curvature radius in each direction is consistent, and when subjected to external forces such as stamping, stress will not be concentrated in a few specific points or areas, thereby effectively reducing the risk of material rupture or damage due to stress concentration.

[0127] In one embodiment, the number of bosses 120 is multiple, and the multiple bosses 120 are uniformly distributed along the bottom wall 12.

[0128] In this embodiment, the number of bosses 120 can be multiple, and the multiple bosses 120 can be uniformly distributed on the bottom wall 12. When the phase change material 2 is in a heat release state, the side wall of the boss 120 is in contact with the phase change material 2 for heat exchange, which can increase the heat exchange area of the shell 1 directly with the phase change material, thereby efficiently and uniformly transferring the heat in the phase change material 2 to the shell 1 (especially the top wall 11) to efficiently and uniformly cook food. In addition, especially for the case where the phase change material does not directly contact the top wall 11, since the top of the boss 120 directly contacts the top wall 11 and the side wall of the boss 120 directly contacts the phase change material 2, by arranging multiple bosses 120, the heat of the phase change material can be directly and efficiently transferred to the top wall 11 through the boss 120 in the shortest path, thereby preferably achieving efficient and uniform cooking of food.

[0129] Similarly, when the phase change material 2 is in the heat absorbing state, the shell 1 provided with the boss 120 can efficiently and quickly and uniformly transfer the heat released by the heating assembly into the phase change material 2, so that the phase change material 2 is quickly charged, and the user's waiting time for preheating is reduced.

[0130] In one specific embodiment, the ratio of the surface area of the boss 120 to the surface area of the bottom wall 12 is between 2% and 90%.

[0131] In the present embodiment, the ratio of the surface area of the boss 120 to the surface area of the bottom wall 12 of the shell 1 is within a predetermined range, which can be greater than 2% and less than 90%. In theory, the larger the ratio of the surface area of the boss 120 to the surface area of the bottom wall 12 of the shell 1, the greater the number of bosses 120, and the greater the role of the heat conduction structure 13 in improving the heat exchange efficiency between the top wall 11 of the shell 1 and the phase change material 2; however, considering that as the number of bosses 120 increases, the surface area of the boss 120 increases, the boss 120 occupies more volume of the cavity, resulting in a decrease in the space available for accommodating the phase change material 2 in the cavity, which in turn affects the heating capacity of the energy storage grill for food. In order to balance the above two aspects, the ratio of the surface area of the boss 120 to the surface area of the bottom wall 12 can be set within the above reasonable range.

[0132] In one embodiment, the ratio of the depth of the boss 120 to the maximum transverse length is between 0.1 and 0.7.

[0133] In the present embodiment, the boss 120 is formed by stamping from the bottom wall 12 to the top wall 11 side, and specifically, the profile of the cross section of the boss 120 formed by stamping can be one or a combination of the above: circular, circular-like, elliptical, elliptical-like. Specifically, the profile of the cross section of the boss 120 is taken as an example of a circle. When the profile of the cross section of the boss 120 is circular, the maximum transverse length of the boss 120 is its diameter.

[0134] The boss 120 depth-to-diameter ratio (ratio of depth to diameter) needs to be controlled within the above reasonable range, and the specific reasons are as follows:

[0135] During the processing and manufacturing stage, the bottom wall 12 of the shell 1 will undergo work hardening when it is deformed by stamping, and the greater the degree of deformation, the more obvious the hardening. When the boss 120 depth-to-diameter ratio (ratio of depth to diameter) is too large, the material deforms greatly and work hardens severely, making it difficult for the material to deform subsequently and increasing the risk of breakage. Taking a metal material (such as stainless steel) as an example, work hardening tends to be strong during stamping, so the boss 120 depth-to-diameter ratio needs to be reasonably controlled to prevent premature failure of the material due to hardening.

[0136] In addition, in the use stage, the depth-diameter ratio of the boss 120 is directly related to the strength of the boss 120. Generally, the greater the depth-diameter ratio of the boss 120, the lower the strength of the boss 120. If the depth-diameter ratio of the boss 120 is too large, the strength of the boss 120 may be reduced due to the thinning of the bottom material, affecting the stability and service life of the part.

[0137] Specifically, please refer to Figure 13 , the temperature change curve of the phase change material on the cooking surface of the heat storage baking tray provided with the heat conduction structure 13 (i.e. the case with the convex bump described in Figure 13 ) and the baking tray without the heat conduction structure 13 (i.e. the case without the convex bump described in Figure 13 ) in the heat absorption and heat release stages.

[0138] Among them, the same test conditions adopted by the two comparative experiments are: placing the heat storage baking tray in the cooking equipment to start heating from room temperature, and the temperature measurement point is the cooking surface of the heat storage baking tray. The inflection point is the change point of the empty cooling after stopping heating. By comparing the two temperature curves respectively containing the temperature rise and heat release stages, it can be seen that: compared with the heat storage baking tray without the heat conduction structure 13 (convex bump), the curve of the heat storage baking tray provided with the heat conduction structure 13 (convex bump), by setting the heat conduction structure 13, the heating speed is faster, and the heat release efficiency of the cooking surface is higher.

[0139] In some embodiments, the shell 1 can be the disc body of the baking tray. Alternatively, in other embodiments, the baking tray can further include a disc body, and the shell 1 is attached to the bottom surface of the disc body.

[0140] For the embodiment in which the shell 1 itself is the disc body of the baking tray, the shell 1 can include an upper shell 101 and a lower shell 102, the upper shell 101 is connected to the lower shell 102, and the cavity is a closed cavity formed by the cooperation of the upper shell 101 and the lower shell 102.

[0141] In the present embodiment, the shell 1 can include an upper shell 101 and a lower shell 102, which can be connected by sealing and fixing, or the upper shell 101 and the lower shell 102 can be formed by one-piece molding. Of course, in the present embodiment, it is also not excluded that the shell 1 is sealed and fixed by more parts of the sub-shell 1, thereby forming a structure with a closed cavity inside. In the embodiments of the present application, the shell 1 mainly includes the upper shell 101 and the lower shell 102 as an example. Among them, the material of the shell 1 is exemplified by a food-grade metal material with good heat conduction performance.

[0142] As shown in Figure 7 , Figure 8 , Figure 9 ,Figure 10 、 Figure 11 and Figure 12 As shown in Figs. 1 1 and 12, the upper shell 101 is provided with a first flange 112 facing the lower shell 102, and the lower shell 102 is provided with a second flange 122 facing the upper shell 101, and the first flange 112 and the second flange 122 are adapted to be connected.

[0143] In the embodiment, the periphery of the upper shell 101 is provided with the first flange 112, which can be arranged to face the lower shell 102, and the periphery of the lower shell 102 is provided with the second flange 122, which can be arranged to face the upper shell 101. Specifically, the upper shell 101 and the lower shell 102 can be fixed and sealed by the first flange 112 and the second flange 122. For example, when the shell 1 is made of metal material, the first flange 112 and the second flange 122 can be fixed and sealed by welding. When the first flange 112 is wrapped outside the second flange 122, the welded part of the shell 1 as a disc body will not be exposed, i.e. not exposed to the cooking environment, so as to ensure the reliability and aesthetics of the shell 1 in use.

[0144] As shown in Figs. 1 1 and 12, the upper shell 101 is provided with a first flange 112 facing the lower shell 102, and the lower shell 102 is provided with a second flange 122 facing the upper shell 101, and the first flange 112 and the second flange 122 are adapted to be connected. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown in Figs. 1 1 and 12, the upper shell 101 is provided with a first flange 112 facing the lower shell 102, and the lower shell 102 is provided with a second flange 122 facing the upper shell 101, and the first flange 112 and the second flange 122 are adapted to be connected.

[0145] In other embodiments, when the shell 1 is arranged independently of the disc body, the shell 1 is arranged to abut the bottom surface of the disc body.

[0146] In the present embodiment, when the shell 1 is arranged separately from the plate body, the shell 1 is used as an auxiliary heating component and a temperature control component of the plate body. When the temperature of the food in the plate body needs to be controlled within a predetermined temperature range, efficient and sufficient heat transfer can be achieved between the shell 1 arranged on the bottom surface of the plate body and the plate body, so that the heat of the plate body is transferred to the phase change material 2 in the shell 1. When the shell 1 is needed to heat the food in the plate body, the heat stored in the phase change material 2 can be transferred to the food in the plate body, so that the food can maintain a predetermined temperature within a predetermined time.

[0147] When the shell 1 is arranged separately from the plate body, the shell 1 and the plate body can be detachably connected or fixedly connected. When the shell 1 and the plate body are connected by a detachable connection, the shell 1 can be adapted to different specifications of the plate body in the user's home, so that the shell 1 has high universality.

[0148] In one embodiment, the shell 1 is further provided with at least one outwardly expanded structure, and a predetermined space 30 is formed in the outwardly expanded structure and communicates with the cavity. The predetermined space 30 is not pre-filled with phase change material 2 or is partially filled with phase change material 2.

[0149] In the present embodiment, the shell 1 is further provided with at least one outwardly expanded structure, and a predetermined space 30 is formed in the outwardly expanded structure and communicates with the cavity. The predetermined space 30 is not pre-filled with phase change material 2 or is partially filled with phase change material 2.

[0150] For example, the outwardly expanded structure can include at least one holding portion 3. When the function of the outwardly expanded structure is to facilitate the user to take and place the heat storage grill, specifically, the heat storage grill can include opposite left and right sides, and the number of holding portions 3 is two, which are arranged on the left and right sides of the heat storage grill, respectively.

[0151] Of course, in the present embodiment, the specific arrangement of the outwardly expanded structure can also be other ways, and is not limited to the above description. Those skilled in the art can also make other changes under the technical essence of the present application, as long as the functions and effects achieved are the same or similar to the present application, which should be covered by the protection scope of the present application.

[0152] The predetermined space 30 formed in the outwardly expanded structure is not pre-filled with phase change material 2 or is partially filled with phase change material 2, that is, the predetermined space 30 of the outwardly expanded structure is at least not filled, and there is a certain accommodation space.

[0153] When the phase change material 2 in the cavity of the shell 1 expands and shrinks due to heat during use, the volume of the phase change material 2 can change and / or the pressure in the cavity can change. For example, when the temperature of the preheating baking tray reaches the phase change temperature of the phase change material, the phase change material can change phase, the volume of the phase change material can change, and the pressure in the cavity can change. For example, when the phase change material changes from a solid phase to a liquid phase, the pressure in the cavity can fluctuate greatly.

[0154] In this embodiment, by providing the outer expansion structure that is in communication with the cavity of the shell 1 and has a containing space, the containing space of the outer expansion structure is used as an expansion space for the phase change material, and the ability of the heat storage baking tray to resist deformation caused by pressure fluctuations due to phase change of the phase change material is improved. In particular, when the space inside the shell 1 and the outer expansion structure is a sealed space as a whole, the cavity in the shell 1 is filled with the phase change material, and the expansion space of the shell 1 is limited. When the phase change material changes phase, the pressure can be transmitted to the containing space in the outer expansion structure, the air in the containing space is compressed, the pressure in the cavity of the shell 1 is dispersed, and the shell 1 is prevented from deforming or even being damaged.

[0155] In one embodiment, the predetermined space 30 of the outer expansion structure is at least partially higher than the cavity.

[0156] In this embodiment, an example of a specific application scenario is provided. When cooking, the heating assembly is started, and when the heating assembly heats the shell 1 (which can also include food on the shell 1), the heat of the shell 1 provided with the heat conduction structure 13 is transmitted to the phase change material, the phase change material absorbs heat and gradually warms up, reaches the phase change temperature, changes phase, the pressure in the cavity of the shell 1 increases, and is transmitted to the predetermined space 30 of the outer expansion structure, preventing the shell 1 from deforming severely. In this process, the phase change material can enter the outer expansion structure.

[0157] When the heating assembly stops heating, the heat stored by the phase change material is transmitted to the shell 1 provided with the heat conduction structure 13, the pressure in the cavity of the shell 1 gradually decreases, and the phase change material that has entered the outer expansion structure flows back into the cavity under the action of gravity. Because the heating assembly stops heating, when the shell 1 as a whole is still at a high temperature, the phase change material flows back into the cavity, the temperature of the outer expansion structure without phase change material decreases relatively faster than the shell 1, and when the outer expansion structure is used as the holding portion 3, the probability of scalding accidents is greatly reduced when the user takes out the heat storage baking tray by operating the holding portion 3.

[0158] In one embodiment, the volume of the cavity in the holding portion 3 is at least 1% larger than the volume of the phase change material 2.

[0159] In the present embodiment, in order to ensure that the holding portion 3 can provide sufficient inflow space for the phase change material 2, the volume of the cavity in the holding portion 3 is larger than the volume of the phase change material 2. Specifically, the volume of the cavity in the holding portion 3 can be at least 1% larger than the volume of the phase change material 2. Of course, the volume of the cavity in the holding portion 3 can be determined according to the properties of the phase change material 2, the performance of the shell 1, and other factors.

[0160] Please refer to Figure 5 and Figure 6 or Figure 11 and Figure 12 In one embodiment, the shell 1 can include an upper shell 101 and a lower shell 102, the upper shell 101 is connected to the lower shell 102, the cavity is formed by the cooperation of the upper shell 101 and the lower shell 102, and the upper shell 101 or the lower shell 102 is provided with a communication hole 14 for communicating with the holding portion 3.

[0161] In the present embodiment, the shell 1 can include an upper shell 101 and a lower shell 102 connected to each other, and the upper shell 101 and the lower shell 102 cooperate to form a cavity inside for accommodating the phase change material 2. The shell 1 can be provided with a communication hole 14 for communicating with the holding portion 3. Specifically, the position of the communication hole 14 can be different according to the specific structure of the shell 1.

[0162] As shown in Figure 6 , when the periphery of the upper shell 101 is provided with a first bending portion 111, the periphery of the lower shell 102 is provided with a second bending portion 121, and the outer side of the first bending portion 111 is sealingly fixed to the inner side of the second bending portion 121, the communication hole 14 can be arranged on the second bending portion 121 of the lower shell 102.

[0163] As shown in Figure 12 , when the upper shell 101 is provided with a first flange 112 facing the lower shell 102, and the lower shell 102 is provided with a second flange 122 facing the upper shell 101, and the first flange 112 is wrapped outside the second flange 122, the communication hole 14 can be arranged on the edge of the upper shell 101, for example, on the first flange 112.

[0164] Specifically, the holding portion 3 can be arranged on the shell 1 by fixed connection, or by detachable connection, or by one-piece forming.

[0165] For example, the through hole 14 can be used as an injection port for injecting or supplementing the energy storage medium (as the shell 1 is internally formed with a closed cavity filled with the phase change material 2, an injection port can be provided at a predetermined position of the shell 1, through which the phase change material 2 can be injected or supplemented into the shell 1). That is, the shell 1 does not need to be additionally provided with an injection port, and the injection port does not need to be provided with the above-mentioned plugging member, so as to ensure the sealing of the structure of the shell 1 and the holding part 3 as a whole, and further optimize the structure, simplify the manufacturing process, etc.

[0166] It should be noted that the shape and structure of the holding part 3 are not specifically limited in the present application, for example, it can be a hollow tube, a hollow sheet, etc.

[0167] The present application also provides a cooking device having a function of baking food, which comprises the above-mentioned heat storage baking tray. The cooking device can achieve the technical effects of the heat storage baking tray, and the specific description is the same as that of the above-mentioned embodiments, which will not be repeated here.

[0168] The cooking device can further comprise an inner container and a heating assembly arranged on the upper portion of the inner container. The cooking device has a first working state and a second working state. In the first working state, the heating assembly heats the shell 1, and the heating assembly heats the shell 1 provided with the heat conduction structure 13, so that the heat released by the heating assembly is transmitted to the phase change material 2 through the shell 1 provided with the heat conduction structure 13. In the second working state, the heat in the phase change material 2 is transmitted to the shell 1 provided with the heat conduction structure 13.

[0169] It should be noted that for the heat storage baking tray, since it needs to be installed in a cooking device for use, the outer contour size and thickness size of the heat storage baking tray need to meet certain requirements. Therefore, the volume of the cavity in the shell 1 is also within a predetermined range. Correspondingly, the filling amount of the phase change material 2 is also within a predetermined range.

[0170] In the embodiment, especially for the heat storage baking tray provided with the outward expansion structure (the holding part 3), the thickness of the heat storage baking tray is not changed, the shell 1 is expanded, more phase change material 2 can be filled in the heat storage baking tray, the phase change material 2 can be in direct contact with the top wall 11 of the shell 1, and the heat absorption and heat release capacity of the heat storage baking tray is improved.

[0171] It should be noted that in the description of the present application, the terms "first", "second" and the like are only used for the purpose of description and distinguishing similar objects, and there is no prior and posterior order between them, nor can it be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0172] The above various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0173] The above is only several embodiments of the present application, although the embodiments disclosed by the present application are as above, the content is only the embodiment adopted for the purpose of understanding the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the form and details of the embodiments without departing from the spirit and scope of the present application. However, the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A heat-retaining baking pan, characterized in that, The heat-retaining baking pan includes: The shell is a closed, hollow structure. The interior of the shell has a cavity with a predetermined volume, which is filled with a phase change material. The phase change material filling the cavity is in contact with the inner wall of the shell. The volume of the phase change material filling the shell is less than or equal to the volume of the cavity. During the heating process, the heat storage baking pan can transfer the heat energy of the shell to the phase change material, and when the heat storage baking pan is used to bake food, it can transfer the heat energy in the phase change material to the shell.

2. The heat-retaining baking pan as described in claim 1, characterized in that, The heat storage baking pan also includes a heat-conducting structure, which can transfer heat energy between itself and the shell. The heat-conducting structure extends at least partially into the phase change material and is in contact with the phase change material.

3. The heat-retaining baking pan as described in claim 2, characterized in that, The thermally conductive structure is part of the housing, or the thermally conductive structure is sealed to the housing.

4. The heat-retaining baking pan as described in claim 3, characterized in that, The heat-conducting structure is part of the housing, which includes a top wall and a bottom wall disposed opposite to each other. The heat-conducting structure is formed by stamping the top wall and / or the bottom wall, or the heat-conducting structure is integrally formed with the top wall and / or the bottom wall.

5. The heat-retaining baking pan as described in claim 4, characterized in that, The heat-conducting structure includes at least one groove disposed from the top wall toward the bottom wall, the bottom of the groove being in contact with the bottom wall.

6. The heat-retaining baking pan as described in claim 4, characterized in that, The heat-conducting structure includes at least one groove disposed from the top wall toward the bottom wall and at least one boss disposed from the bottom wall toward the top wall, wherein the bottom of the groove is in contact with the top of the boss.

7. The heat-retaining baking pan as described in claim 4, characterized in that, The heat-conducting structure includes at least one protrusion formed from the bottom wall toward the top wall, the top of the protrusion being in contact with the top wall.

8. The heat-retaining baking pan as described in claim 7, characterized in that, The top of the boss is in surface contact with the top wall.

9. The heat-retaining baking pan as described in claim 8, characterized in that, At least a portion of the upper surface of the top wall is used to form a cooking surface, the cooking surface having a planar structure, and the boss is directly opposite the cooking surface.

10. The heat-retaining baking pan as described in claim 7, characterized in that, The material of the thermally conductive structure includes any one or a combination of the following: metal, ceramic, and graphite.

11. The heat-retaining baking pan as described in claim 10, characterized in that, The material of the heat-conducting structure includes a metallic material, and the top of the boss is welded to the top wall.

12. The heat-retaining baking pan as described in claim 8, characterized in that, The profile of the boss cross section includes any one or a combination of the following: circular, near-circular, elliptical, or near-elliptical.

13. The heat-retaining baking pan as described in claim 7, characterized in that, The number of protrusions is multiple, and the multiple protrusions are evenly distributed along the bottom wall at intervals.

14. The heat-retaining baking pan as described in claim 7, characterized in that, The ratio of the surface area of ​​the boss to the surface area of ​​the bottom wall is between 2% and 90%.

15. The heat-retaining baking pan as described in claim 6, characterized in that, The ratio between the depth of the boss and its maximum lateral length is between 0.1 and 0.

7.

16. The heat-retaining baking pan as described in claim 1, characterized in that, The housing includes a top wall and a bottom wall disposed opposite to each other, and the phase change material filling the cavity is in contact with the top wall or there is a predetermined gap between the phase change material and the top wall.

17. The heat-retaining baking pan as described in claim 16, characterized in that, Air is stored within the predetermined gap.

18. The heat-retaining baking pan as described in claim 15, characterized in that, The shell is also provided with at least one outward expansion structure, and a predetermined space communicating with the cavity is formed inside the outward expansion structure. The predetermined space is not pre-filled with phase change material or is filled with a portion of phase change material.

19. The heat-retaining baking pan as described in claim 18, characterized in that, The predetermined space of the extended structure is at least partially higher than the cavity.

20. The heat-retaining baking pan as described in claim 19, characterized in that, The extended structure includes at least one gripping part.

21. The heat-retaining baking pan as described in claim 20, characterized in that, The heat-retaining baking pan includes a left side and a right side opposite each other, and the number of grips is two, which are respectively arranged on the left side and the right side of the heat-retaining baking pan.

22. The heat-retaining baking pan as described in claim 20, characterized in that, The volume of the cavity within the gripping portion is at least 1% greater than the volume of the phase change material.

23. The heat-retaining baking pan as described in claim 18, characterized in that, The housing includes an upper housing and a lower housing, the upper housing is connected to the lower housing, the cavity is formed by the upper housing and the lower housing, and the upper housing or the lower housing is provided with a connecting hole that connects to the outward expansion structure.

24. The heat-retaining baking pan as described in claim 23, characterized in that, The connecting hole can be used as a hole for injecting the phase change material.

25. The heat-retaining baking pan as described in any one of claims 1 to 24, characterized in that, The shell is the body of the baking pan.

26. The heat-retaining baking pan as described in claim 1, characterized in that, The housing includes an upper housing and a lower housing, the upper housing is connected to the lower housing, and the cavity is a closed cavity formed by the cooperation of the upper housing and the lower housing.

27. The heat-retaining baking pan as described in claim 26, characterized in that, The upper housing is provided with a first flange facing the lower housing, and the lower housing is provided with a second flange facing the upper housing. The first flange and the second flange are adapted to be connected.

28. The heat-retaining baking pan as described in claim 27, characterized in that, The first flange covers the outside of the second flange, and the first flange and the second flange are sealed and fixed.

29. The heat-retaining baking pan as described in claim 26, characterized in that, The upper housing has a first bend on its periphery, and the lower housing has a second bend on its periphery. The outer side of the first bend and the inner side of the second bend are sealed and fixed together.

30. The heat-retaining baking pan according to any one of claims 1 to 24, characterized in that, The baking pan also includes a pan body, and the shell is fitted onto the bottom surface of the pan body.

31. The heat-retaining baking pan as described in claim 30, characterized in that, The housing is detachably or fixedly connected to the disk.

32. The heat-retaining baking pan as described in claim 1, characterized in that, The phase change point temperature of the phase change material is 80℃-230℃.

33. A cooking appliance, characterized in that, The cooking device has the function of baking food, and the cooking device includes the heat-retaining baking pan according to any one of claims 1-32.

34. The cooking apparatus as described in claim 33, characterized in that, The cooking device further includes an inner pot and a heating element disposed on the upper part of the inner pot. The cooking device has a first working state and a second working state. In the first working state, the heating component heats the housing, and the heat released by the heating component is transferred to the phase change material through the housing; In the second operating state, the heat in the phase change material is transferred to the housing.

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