Pot body, cooking utensil and preparation method of pot body

Abstract

The invention relates to the technical field of household appliances, and provides a pot body, a cooking utensil and a preparation method of the pot body. According to the pot body, the pot body comprises a pot bottom, a transition section and a side wall which are sequentially connected, and the thickness of the pot bottom is larger than that of the side wall. According to the pot body, the thickness of the pot bottom is larger than that of the side wall, heat accumulation of the pot bottom is improved, meanwhile, heat diffusion of the side wall can be accelerated, the heat conduction and heat accumulation effects are adjusted through difference of the wall thickness, and therefore local temperature difference is formed between the pot bottom and the side wall, heat flow rolling is enhanced, and food materials are heated more evenly.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a pot body, a cooking appliance, and a method for manufacturing the pot body. Background Art

[0002] With the continuous improvement of people's living standards, the requirements for cooking appliances such as rice cookers and electric pressure cookers in the market are becoming increasingly refined and strict, and more attention is paid to the taste of steamed foods represented by rice. The heat conduction and heat storage capabilities of the pot body in cooking appliances will directly affect the cooking effect of the food materials. However, when the inner pot of the existing cooking appliances is heated, it cannot generate a sufficient convection effect, and it is difficult to uniformly heat the cooked food materials. Therefore, improving the cooking effect of the food materials has become an urgent problem to be solved. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the related art. For this purpose, the present invention provides a pot body to solve the defect that the existing pot body cannot generate a sufficient convection effect.

[0004] The present invention also provides a cooking appliance.

[0005] The present invention also provides a method for manufacturing the pot body.

[0006] According to the pot body of the first aspect embodiment of the present invention, the pot body includes a bottom, a transition section, and a side wall connected in sequence, and the thickness of the bottom is greater than the thickness of the side wall.

[0007] According to the pot body of the embodiment of the present invention, the thickness of the bottom is greater than the thickness of the side wall. While improving the heat storage of the bottom, it can accelerate the heat diffusion of the side wall, adjust the heat conduction and heat storage effects through the difference in wall thickness, thereby forming a local temperature difference between the bottom and the side wall, enhancing the heat flow tumbling, and making the food materials heated more evenly.

[0008] According to an embodiment of the present invention, the thickness of the bottom is uniform, and the thickness of the side wall is uniform.

[0009] According to an embodiment of the present invention, the thickness of the transition section gradually increases along the direction towards the bottom, and / or at least part of the thickness of the bottom is greater than or equal to the thickness of the transition section.

[0010] According to an embodiment of the present invention, the pot body includes:

[0011] A pot base;

[0012] A magnetic conductive coating, which is provided on the outer surface of the lower part of the pot base.

[0013] According to an embodiment of the present invention, the thickness of the magnetic conductive coating corresponding to the bottom of the pot is greater than the thickness of the magnetic conductive coating corresponding to the transition section and / or the side wall.

[0014] According to an embodiment of the present invention, the pot body further includes a pot rim, the pot rim is connected to one end of the side wall away from the transition section, and the thickness of the pot rim is greater than the thickness of the side wall.

[0015] According to an embodiment of the present invention, a heat concentrating ring is provided along the height direction of the transition section.

[0016] According to an embodiment of the present invention, the heat concentrating ring is an annular groove or an annular rib.

[0017] According to an embodiment of the present invention, the annular groove is a flared groove.

[0018] and / or

[0019] A chamfer is provided at the opening of the annular groove.

[0020] According to an embodiment of the present invention, the aspect ratio of the annular groove is 1 / 5 - 1 / 2; and / or, the opening width of the annular groove is 1.5 mm - 4 mm, and the depth of the annular groove is 0.2 mm - 1 mm;

[0021] and / or

[0022] The cross-section of the annular groove is an isosceles trapezoid, and the angle of the obtuse angle of the isosceles trapezoid is 100° - 150°.

[0023] According to an embodiment of the present invention, there are multiple heat concentrating rings, and the multiple heat concentrating rings are arranged at intervals along the height direction of the transition section, and the multiple heat concentrating rings are evenly distributed along the height direction of the transition section.

[0024] According to an embodiment of the present invention, the multiple heat concentrating rings are evenly distributed at equal intervals along the height direction of the transition section, and the ratio of the opening width of the annular groove to the interval distance of the multiple heat concentrating rings is 1 / 19 - 1 / 2.

[0025] A cooking appliance according to an embodiment of the second aspect of the present invention includes:

[0026] The above-mentioned pot body;

[0027] A mounting seat, the mounting seat forms a receiving space for the pot body;

[0028] A heating device, arranged on the mounting seat, suitable for heating the pot body.

[0029] The cooking appliance according to an embodiment of the present invention includes the above-mentioned pot body, and thus has all the technical effects of the above-mentioned pot body, which will not be elaborated here.

[0030] The preparation method of the pot body according to the third aspect embodiment of the present invention includes:

[0031] A pouring step of pouring molten metal into the cavity of the mold and solidifying to obtain a preliminary processed body;

[0032] A forging step of forging the preliminary processed body with a punch of liquid die forging to obtain a transition processed body;

[0033] A surface treatment step of demolding and cooling the transition processed body and performing surface treatment to obtain the pot body.

[0034] According to an embodiment of the present invention, before the pouring step, the cavity of the mold is preheated;

[0035] In the forging step, the transition processed body is subjected to a pressure holding treatment for a set time;

[0036] In the surface treatment step, it includes: sequentially performing surface sandblasting, high-temperature degreasing, magnetic conductive coating spraying, and non-stick coating spraying on the transition processed body.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 is a schematic cross-sectional structure diagram of the pot body provided by the embodiment of the present invention;

[0040] Figure 2 is Figure 1 a partial enlarged view of part B of the pot body provided by the embodiment of

[0041] Figure 3 is a schematic structure diagram of the pot body provided by the embodiment of the present invention;

[0042] Figure 4 is Figure 3 a partial enlarged view of part A of the pot body provided by the embodiment of

[0043] Figure 5 It is a schematic structural diagram of the groove of the pot body provided by the embodiment of the present invention.

[0044] Reference numerals:

[0045] 100, pot body; 110, bottom of the pot; 120, transition section; 121, energy-gathering ring; 130, side wall; 140, pot base; 150, magnetic conductive coating; 160, pot rim. Specific embodiments

[0046] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0049] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] According to an embodiment of the present invention, please refer to Figure 1 and Figure 2 The pot body 100 includes a pot bottom 110 , a transition section 120 and a side wall 130 which are connected in sequence, and the thickness of the pot bottom 110 is greater than the thickness of the side wall 130 .

[0052] According to the pot body of the embodiment of the present invention, the thickness of the pot bottom 110 is greater than the thickness of the side wall 130, so as to improve the heat storage of the pot bottom 110 and accelerate the heat diffusion of the side wall 130. The heat conduction and heat storage effects are adjusted by differentiating the wall thickness, thereby forming a local temperature difference between the pot bottom 110 and the side wall 130, enhancing the heat flow rolling, and making the food heated more evenly.

[0053] According to one embodiment of the present invention, the thickness of the pot bottom 110 is uniform, and the thickness of the side wall 130 is uniform. It is understandable that the uniform thickness of the pot bottom 110 can allow heat to be quickly and evenly transferred to the pot bottom 110, so that the pot bottom 110 is heated evenly, avoiding the occurrence of hot spots or uneven heat distribution. The uniform thickness of the side wall 130 can maintain good uniformity when the heat is transferred from the bottom to the top, avoiding the problem of low edge temperature caused by the concentration of heat at the bottom. The uniform thickness of the pot bottom 110 and the side wall 130 can improve the heat retention performance of the pot body 100, and can also improve the longitudinal transfer effect of the heat of the pot body 100. The heat flow rolling caused by the local temperature difference between the pot bottom 110 and the side wall 130 is more stable, thereby achieving the purpose of improving the cooking effect. Of course, it is also possible that the thickness of one of the pot bottom 110 and the side wall 130 is uniform.

[0054] According to an embodiment of the present invention, the thickness of the transition section 120 gradually increases along the direction from the side wall 130 towards the bottom of the pot 110. It can be understood that the gradually increasing thickness of the transition section 120 avoids heat concentration in the bottom part of the pot 110, which may cause the temperature of the bottom part of the pot 110 to be too high and the temperature of the upper part of the pot body 100 to be too low. This helps to improve the longitudinal heat transfer effect of the pot body 100. The gradually changing thickness allows heat to be transferred more evenly to the transition section 120 of the pot body 100, ensuring uniform heating. In addition, the gradually increasing thickness of the transition section 120 along the direction towards the bottom of the pot 110 can provide better structural strength and stability, enabling it to better resist the pressure of deformation and distortion, making the pot more durable and long-lasting.

[0055] In one embodiment, the thickness of at least a part of the transition section 120 is greater than the thickness of the bottom of the pot 110. It can be understood that the relatively large thickness of the transition section 120 can increase the weight and stability of the pot, thus better fixing the pot on the stove or heat source, reducing the possibility of movement or tilting, and making the cooking process safer. The relatively large thickness can increase the structural strength of the pot, making the pot more durable and resistant to deformation. Especially during high-temperature or long-term use, it can reduce the deformation and wear of the bottom of the pot 110 and extend the service life of the pot.

[0056] According to an embodiment of the present invention, the thickness of the bottom of the pot 110 is less than 8 mm, and the thickness of the side wall 130 is greater than 4 mm. It can be understood that in order to achieve a good heat storage effect and meet the requirements of liquid die forging process forming, the thickness of the side wall 130 is greater than 4 mm. At the same time, in order to avoid energy waste, if the pot body 100 absorbs too much heat, it will cause energy waste and the energy efficiency value of the cookware will become low. Therefore, the thickness of the bottom of the pot 110 is less than 8 mm.

[0057] It should be noted that when the pot body 100 includes a coating (the coating includes Figure 5 the magnetic conductive coating 150 or waterproof coating, etc. hereinafter simply referred to as the coating), the thickness here refers to the sum of the thickness of the pot substrate 140 and the coatings sprayed inside and outside the pot substrate 140. In one embodiment, the thickness of the pot substrate 140 is uniform. After the magnetic conductive coating 150 is provided on the pot substrate 140, the thickness of different positions of the pot body 100 is different, and the overall thickness value ranges from 4 mm to 8 mm.

[0058] According to an embodiment of the present invention, the pot body 100 further includes a pot rim 160. The pot rim 160 is connected to one end of the side wall 130 away from the transition section 120, and the thickness of the pot rim 160 is greater than that of the side wall 130. It can be understood that the relatively thick pot rim 160 can provide better structural support, making the pot have stronger anti-deformation and anti-distortion capabilities. This can prevent the pot body 100 from deforming or being distorted due to temperature changes or heating during use. In addition, the relatively thick pot rim 160 can provide a larger grasping space, making the operation more convenient. The thick pot rim can better prevent heat transfer to the hand and reduce the risk of scalding.

[0059] According to an embodiment of the present invention, the pot body 100 includes a pot base 140 and a magnetic conductive coating 150; the magnetic conductive coating 150 is provided on the outer surface of the lower part of the pot base 140 (that is, the bottom 110 and the transition section 120 of the pot body 100 are provided with the magnetic conductive coating 150). It can be understood that by providing the magnetic conductive coating 150, the pot can be equipped with an electromagnetic induction heating function. By placing the magnetic conductive coating 150 on the outer surface of the lower part of the pot base 140, it can ensure that the magnetic field can better penetrate to the lower part of the pot base 140, making the heating more uniform and efficient.

[0060] In one embodiment, the powder particle size of the magnetic conductive coating 150 is 1 - 50 microns, and the porosity is 0.1 - 0.5%. It can be understood that the magnetic conductive coating 150 contains pores inside. The pores have an absorption effect on the incident sound waves, and the sound energy is converted into heat energy by friction inside the material and dissipated, thus achieving a noise reduction effect.

[0061] In one embodiment, the magnetic conductive coating 150 is made by a cold spraying process. The cold spraying process is also known as cold gas dynamic spraying. It is a surface processing method in which the powder is accelerated to supersonic speed by an air flow and sprayed onto the surface of the workpiece, and the plastic deformation generated by the high-speed impact of the sprayed powder on the substrate surface makes it combine with the workpiece in a solid state and form a coating. The working air flow in the cold spraying process is selected from one or a mixture of several of air, nitrogen, and inert gases.

[0062] It can be understood that for the magnetic conductive coating 150 made by the cold spraying process, there is no gap between the magnetic conductive coating 150 and the pot base 140. When heating, the noise problem caused by micro-gaps can be effectively avoided. By tightly combining the magnetic conductive coating 150 and the pot base 140 through the cold spraying process, not only can the noise source be effectively reduced, but also the incident sound waves can be absorbed by the pores of the magnetic conductive coating 150, achieving a noise reduction effect.

[0063] In one embodiment, the pot base 140 is composed of at least one of aluminum-based alloys such as aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, and aluminum-zinc alloy.

[0064] In one embodiment, the sprayed powder of the magnetic conductive coating 150 is selected from any one of ferromagnetic materials such as ferritic stainless steel, low-carbon steel or iron-based materials.

[0065] In one embodiment, the spraying pressure of cold spraying is 1 MPa - 3.5 MPa, the spraying temperature is 400 - 600 °C, the flow rate of the working gas is 0.8 - 3 m 3 / min, the spraying distance is 10 - 50 mm, and the conveying amount of the magnetic conductive powder is 5 - 15 kg / h.

[0066] According to an embodiment of the present invention, the thickness of the magnetic conductive coating 150 corresponding to the position of the bottom of the pot 110 is greater than the thickness of the magnetic conductive coating 150 corresponding to the transition section 120 and / or the side wall 130. It can be understood that the position of the bottom of the pot 110 is the part where heat is strongly received, and higher heat conduction performance is required to accelerate the heat transfer. The magnetic conductive coating 150 with a larger thickness can provide stronger heat conduction, enabling the heat to be conducted to the vicinity of the bottom of the pot 110 faster, thereby increasing the longitudinal heat transfer speed. In addition, such a setting can make the magnetic field more concentrated at the position of the bottom of the pot 110, enhancing the effect of the magnetic field, and thus improving the longitudinal heat transfer. Moreover, the magnetic conductive coating 150 with a larger thickness can better protect the bottom of the pot 110, reduce the wear and corrosion of the bottom of the pot 110, and extend the service life.

[0067] In one embodiment, the ratio between the thickness of the magnetic conductive coating 150 corresponding to the position of the bottom of the pot 110 and the thickness of the magnetic conductive coating 150 corresponding to the transition section 120 is 1.2 - 1.5. It can be understood that if the ratio between their thicknesses is too high, the thickness of the magnetic conductive coating 150 corresponding to the transition section 120 is relatively thin, and the heating speed of the side wall 130 is relatively slow, affecting the overall electromagnetic induction heating effect. If the ratio between their thicknesses is too low, and the thickness of the magnetic conductive coating 150 corresponding to the transition section 120 is close to the thickness of the magnetic conductive coating 150 corresponding to the position of the bottom of the pot 110, it will affect the longitudinal heat transfer effect. By setting the thickness ratio between them to 1.2 - 1.5, the overall heating effect and the longitudinal heat transfer effect can be balanced, thereby improving the cooking effect.

[0068] For the pot body 100 according to the embodiment of the present invention, in combination with Figure 3 and Figure 4 , an energy concentrating ring 121 is arranged along the outer wall surface of the transition section 120.

[0069] The pot body 100 according to an embodiment of the present invention can effectively increase the heating area of the transition section 120 and enhance the energy-gathering effect of the transition section 120 by providing an energy-gathering ring 121 in the transition section 120, thereby improving the cooking effect of the pot body 100 on food materials. It can be understood that when the pot body 100 has an electromagnetic induction heating function, the energy-gathering ring 121 can expand the magnetic conduction area and increase the effective heating area. At the same time, each turn of the energy-gathering ring 121 will play the role of the energy-gathering ring 121 during electromagnetic heating, which is beneficial to improving the heating effect. In addition, the energy-gathering ring 121 can play a pinning role on the coatings (including the magnetic conduction coating 150 and the waterproof coating, etc.) provided on its surface. The energy-gathering ring 121 can increase the contact area between it and the coatings, thereby increasing the friction force and improving the connection strength.

[0070] It should be noted that the energy-gathering ring 121 has excellent heat conduction performance, which can effectively optimize the heat distribution and transfer during the cooking process to improve the cooking efficiency and uniformity. By installing the energy-gathering ring 121 in the transition section 120, the heat can be better conducted to the food, improving the heating efficiency.

[0071] It can be understood that the energy-gathering ring 121 has an annular structure, and the center of the annular structure is located on the center line of the pot body 100. The annular structure can make the heat evenly transfer from the annular structure to the inside of the pot body 100.

[0072] In one embodiment, in combination with Figure 3 , a plurality of energy-gathering rings 121 are provided on the outer wall surface of the transition section 120 along its height direction (i.e., the longitudinal direction in Figure 3 ), and the plurality of energy-gathering rings 121 are arranged at intervals along the height direction of the transition section 120.

[0073] It can be understood that the interval arrangement between the plurality of energy-gathering rings 121 can evenly heat the food. The interval arrangement can promote the formation of a longitudinal heat conduction path between the bottom 110 and the transition section 120. While increasing the heat conduction area between the bottom 110 and the transition section 120, it can also prevent the heat from being overly concentrated on the same energy-gathering ring 121, making it possible to more effectively utilize the heat energy, improve the heating efficiency, and shorten the heating time of cooking.

[0074] In one embodiment, please refer to Figures 1 to 4, the transition section 120 bends towards the inside of the pot body 100 and is smoothly connected to the bottom of the pot 110. The energy-gathering ring 121 along its own height direction varies in size according to the height direction where it is located. The energy-gathering ring 121 is distributed along the curved surface of the transition section 120 in the height direction of the transition section 120. It can be understood that the transition section 120 bending towards the inside of the pot body 100 and being smoothly connected to the bottom of the pot 110 can reduce the possibility of food residues accumulating in the corners of the bottom of the pot 110, and reduce the difficulty during cleaning, making the cleaning more convenient and fast. It should be noted that the transition section 120 can also adopt other structural forms, and no examples are given one by one here, as long as the energy-gathering ring 121 mentioned above can be provided on the outer wall surface of the transition section 120.

[0075] In one embodiment, the pot body 100 is a straight-wall type pot body 100, and the side wall 130 is perpendicular to the horizontal plane where the bottom of the pot 110 is located, and its preparation is simple.

[0076] The first end of the transition section 120 is connected to the bottom of the pot 110, and the side wall 130 is connected to the second end of the transition section 120. The bottom of the pot 110, the transition section 120, and the side wall 130 connected in sequence enclose the cooking cavity of the pot body 100. The energy-gathering ring 121 can be integrally formed with the pot body 100. For example, it can be an annular groove or an annular rib on the pot body 100. The energy-gathering ring 121 can also be an independent component installed on the pot body 100.

[0077] According to an embodiment of the present invention, the energy-gathering ring 121 is an annular groove or an annular rib. It can be understood that the energy-gathering ring 121 being an annular groove or an annular rib can increase the heat conduction surface area between the bottom of the pot 110 and the side wall of the pot 130, make the heat evenly distributed inside the pot body 100, realize the uniform heating of food, and avoid problems such as local high temperature or low temperature.

[0078] Of course, the energy-gathering ring 121 can also be other structures. For example, the energy-gathering ring 121 includes a plurality of convex platforms, and the plurality of convex platforms are annularly distributed and distributed in a circle along the circumferential direction of the transition section 120 to form an annular structure.

[0079] According to an embodiment of the present invention, the annular groove (hereinafter simply referred to as the groove) is a flared groove. It can be understood that, on the one hand, the flared structure is convenient for manufacturing and processing. The opening width of the groove gradually increases, and the processing difficulty of the groove is small. On the other hand, the flared structure is convenient for the spraying and covering of the coating.

[0080] It can be understood that the energy-gathering ring 121 can play a pinning role on the coating (including the magnetic conductive coating 150 and the waterproof coating, etc.) provided on its surface. The energy-gathering ring 121 can increase the contact area between it and the coating, thereby increasing the friction force and thus improving the connection strength.

[0081] In some embodiments, the cross-section of the groove is an isosceles trapezoid (refer to Figure 5 ). The isosceles trapezoid design is beneficial to ensure uniform coating coverage at the bottom and both sides of the groove, with better consistency. Of course, the groove with an isosceles trapezoid cross-section here is only an example and not a limitation of the present invention. The cross-sectional shape of the groove can also be semi-circular, or formed by other curved surfaces, as long as the structure of the flared groove is formed.

[0082] In one embodiment, the angle of the obtuse angle of the isosceles trapezoid groove is 100° - 150°.

[0083] According to an embodiment of the present invention, a chamfer is provided at the opening of the groove. It can be understood that chamfering at the opening of the groove facilitates more uniform spraying and covering of the coating, avoiding sudden changes in the thickness of the coating at the opening of the groove.

[0084] In one embodiment, chamfers are provided at all geometric angles of the groove. For example, when the groove is an isosceles trapezoid, chamfers are provided at both the acute angle and the obtuse angle of the isosceles trapezoid.

[0085] Among them, the range of the chamfer can be 0.2 mm - 0.5 mm.

[0086] According to an embodiment of the present invention, please refer to Figure 5 , the aspect ratio of the groove is 1 / 5 - 1 / 2. It can be understood that the aspect ratio of the groove refers to the ratio between the depth of the groove and the opening width of the groove. For example, when the aspect ratio of the groove is 1 / 5, the depth of the groove is 0.4 mm and the opening width of the groove is 2 mm.

[0087] In one embodiment, the range of the opening width of the groove is 1.5 mm - 4 mm; the range of the depth of the groove is 0.2 mm - 1 mm.

[0088] It should be noted that when the depth of the groove is too small, the pinning effect of the coating will not be obvious, affecting the stability of the coating on the pot body 100. When the depth of the groove is too large, it will affect the coverage of the coating, easily causing the coating not to completely cover the surface of the groove. Moreover, when the groove is grooved too deeply, the wall thickness of the transition section 120 will be thinned, reducing the heat storage effect of the pot body 100 at this place.

[0089] Specifically, when the opening width of the groove is less than 1.5 mm, it will interfere with the adhesion of the coating in the groove area, easily causing the coating not to completely cover the surface of the groove. When the opening width of the groove is greater than 4 mm, the energy at the groove is easily diffused and released outward, affecting the energy concentration effect during electromagnetic heating of the groove.

[0090] It can be understood that the design of the flared trapezoidal groove is to reduce the shielding effect during coating spraying. The angle of the trapezoidal groove and the chamfer can effectively improve the coverage effect of the coating at the groove, enabling the coating to better cover the outer surface of the pot body 100.

[0091] According to an embodiment of the present invention, the area of the groove accounts for 5%-30% of the outer surface area of the entire transition section 120. Correspondingly, at this time, the ratio of the opening width of the groove to the spacing distance between adjacent grooves can be 1 / 19 - 1 / 2. It can be understood that if the area ratio of the groove is greater than 30%, some grooves are relatively far from the coil disc during electromagnetic heating, and the part where the distance between the groove and the coil disc is greater than the normal spacing will significantly affect the electrical parameters of the pot body 100, which is not conducive to the electromagnetic heating effect; if the area ratio of the groove is less than 5%, the energy concentrating effect and the function of increasing the heating area of the groove on the transition section 120 will be very limited. Further, if the ratio of the opening width of the groove to the spacing distance between adjacent grooves is too small, that is, the opening width of the groove is relatively narrow compared to the outer surface of the entire transition section, it is not conducive to the spraying of the magnetic conductive coating, and it is difficult to ensure that the bonding strength between the magnetic conductive coating 150 and the pot base 140 meets the usage requirements of the cookware.

[0092] According to an embodiment of the present invention, a plurality of energy concentrating rings 121 are evenly distributed along the height direction of the transition section 120. It can be understood that the spaced arrangement of the plurality of energy concentrating rings 121 and the uniform distribution of the energy concentrating rings 121 along the height direction of the transition section 120 are to ensure the uniformity of electromagnetic heating of the energy concentrating rings 121 in the transition section 120, so that each local area has the effect of the energy concentrating rings 121.

[0093] In one embodiment, a plurality of energy concentrating rings 121 are unevenly spaced along the height direction of the transition section 120. The spacing of the energy concentrating rings 121 closer to the bottom 110 side is greater than the spacing of the energy concentrating rings 121 closer to the side wall 130 side. Along the height direction of the transition section 120 towards the side wall 130, the distance between the energy concentrating rings 121 gradually decreases. It can be understood that since the distance between the energy concentrating rings 121 at different positions of the transition section 120 and the coil disc of electromagnetic heating will produce different heating effects, when the distance between the energy concentrating rings 121 and the coil disc of electromagnetic heating is far, the electromagnetic induction effect is relatively weak, and when the distance between the energy concentrating rings 121 and the coil disc of electromagnetic heating is close, the electromagnetic induction effect is relatively strong. By reasonably setting the distribution of the energy concentrating rings 121 on the transition section 120, the spacing of the energy concentrating rings 121 closer to the bottom 110 side is greater than the spacing of the energy concentrating rings 121 closer to the side wall 130 side, reducing the spacing to enhance the local heat, so that the energy concentrating effect of each local area is uniform.

[0094] A cooking appliance according to an embodiment of the present invention includes the above-mentioned pot body 100, a mounting base, and a heating device (neither the mounting base nor the heating device is shown in the figure). The mounting base forms a receiving space for the pot body 100; the heating device is disposed on the mounting base and is adapted to heat the pot body 100. The cooking appliance can be an electric rice cooker, a pressure cooker, an electric stew pot, etc., or can also be an induction cooker, and the specific type is not limited.

[0095] It can be understood that the mounting base forming the receiving space can be that there is a receiving space formed inside the mounting base, and the pot body 100 is placed in the receiving space, or the mounting base is a mounting platform, and the upper part of the mounting platform is the receiving space for the pot body 100. For example, if the cooking appliance is an electric rice cooker, then at this time the mounting base is the outer shell of the electric rice cooker, and a receiving space is formed inside the outer shell.

[0096] It can be understood that the heating device can be one or more of an electric heating element, an electromagnetic induction heating element, and a steam heating element.

[0097] The cooking appliance according to an embodiment of the present invention includes the above-mentioned pot body 100, and thus has all the technical effects of the above-mentioned pot body 100, which will not be elaborated here.

[0098] A method for preparing a pot body according to an embodiment of the present invention includes:

[0099] A pouring step of pouring molten metal into the cavity of the mold and solidifying to obtain a pre-processed body;

[0100] A forging step of forging the pre-processed body with a punch of liquid die forging to obtain a transition-processed body;

[0101] A surface treatment step of taking the transition-processed body out of the mold for cooling and performing surface treatment to obtain the pot body.

[0102] It should be noted that the method for preparing the pot body of the present invention is a metal forming process with both casting characteristics and die forging characteristics. A certain amount of molten metal is directly poured into the mold cavity and solidified under the action of continuous mechanical static pressure.

[0103] It can be understood that in the pouring step, the molten metal can be at least one of aluminum-based alloys such as aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, and aluminum-zinc alloy. The temperature at which the molten metal enters the cavity of the mold can be 650 - 750 °C.

[0104] It can be understood that in the forging step, the extrusion casting pressure of the punch of liquid die forging can be 60 MPa - 150 MPa. The filling speed of the molten metal is less than 0.8 m / s. The pressurizing speed of the punch of liquid die forging is between 0.1 - 0.4 m / s.

[0105] It can be understood that the semi-finished product obtained in the casting step can be regarded as the initially obtained casting of the pot base 140. The basic shape of the pot base 140 is obtained through the forging step. Finally, a pot body with a bottom 110 thicker than the side wall 130 is obtained through the surface treatment step. The thickness here refers to the sum of the thickness of the pot base 140 and the coatings sprayed on the inner and outer surfaces of the pot base 140.

[0106] It can be understood that the pot body 110 may already form a semi-finished product with a bottom 110 thicker than the side wall 130 in the casting step, or it may be a transitional processed body with a bottom 110 thicker than the side wall 130 formed in the forging step, or it may be a pot body with a bottom 110 thicker than the side wall 130 finally obtained after the surface treatment step.

[0107] According to an embodiment of the present invention, before the casting step, the cavity of the mold is preheated;

[0108] In the forging step, the transitional processed body is subjected to pressure holding treatment for a set time;

[0109] In the surface treatment step, it includes: successively performing surface sandblasting, high-temperature degreasing, magnetic conductive coating spraying, and non-stick coating spraying on the transitional processed body.

[0110] It can be understood that preheating the cavity of the mold can improve the fluidity and filling property of the metal, and reduce the resistance of the metal during the filling process. The surface temperature of the preheated mold cavity is relatively high, making it easier for the metal to fill into all corners of the mold when injected, ensuring uniform filling of the metal and avoiding problems such as pores and defects. The preheating temperature of the mold cavity can be 200 - 300 °C.

[0111] It can be understood that the pressure holding treatment can be understood as when the punch processes the semi-finished product, the punch forges the semi-finished product for a set period of time, and the set time can be set to 10 - 30 s.

[0112] It can be understood that the surface treatment step includes roughness treatment of the inner and outer surfaces of the pot body 100, such as surface sandblasting, and also includes coating spraying treatment of the inner and outer surfaces of the pot body 100. For example, a magnetic conductive coating 150 is sprayed on the outer surface of the pot body, and a non-stick coating is sprayed on the inner surface of the pot body, etc.

[0113] It should be noted that the high-temperature degreasing in the surface treatment step refers to removing grease and other organic substances from the workpiece at high temperature. During the processing, some organic substances such as grease, wax, and adhesives may adhere to the surface of the pot body 100. High-temperature degreasing can effectively remove these pollutants, improve the surface quality and performance of the workpiece, and enhance the thermal stability of the material.

[0114] The preparation method of the pot body of the present invention is described below with a specific preparation process:

[0115] The aluminum ingot is heated and melted at 720 - 780 °C, and then poured into the cavity of the mold. The pouring temperature of the molten aluminum is between 650 - 750 °C. The preheating temperature of the cavity of the mold is 200 - 300 °C.

[0116] After entering the cavity of the mold, the punch of the liquid die forging extrudes and casts it. The extrusion pressure is between 60 MPa - 150 MPa, the pressurizing speed of the punch of the liquid die forging is 0.1 - 0.4 m / s. At the same time, the holding pressure time of the punch of the liquid die forging on the preliminary processed part is 10 - 30 s. It is demolded from the cavity of the mold and cooled to obtain a transition processed part.

[0117] The inner and outer surfaces of the transition processed part are sandblasted. After sandblasting, the surface roughness of the inner and outer surfaces is Ra2μm - Ra5μm. After sandblasting, the transition processed part is subjected to high-temperature degreasing at 350 - 420 °C and kept at a high temperature for 8 - 15 min. After high-temperature degreasing, a magnetic conductive coating 150 is cold-sprayed on the bottom and the lower side wall of the transition processed part. After the magnetic conductive coating 150 is cooled, an anti-corrosion treatment is performed on its surface. And a non-stick coating is sprayed inside the aluminum alloy. The non-stick coating includes, but is not limited to, non-stick coatings made of materials such as PTFE, PFA, PEEK, PEKK, ceramics, etc.

[0118] It should be noted that the preparation method of the pot body of the present invention is not limited by the examples here. The above embodiments only represent one implementation manner of the present invention, but should not be construed as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should all be covered by the scope of the claims of the present invention.

Claims

1. A pot body (100), characterized in that, the pot body (100) includes a bottom (110), a transition section (120) and a side wall (130) connected in sequence, and the thickness of the bottom (110) is greater than the thickness of the side wall (130).

2. The pot body (100) according to claim 1, characterized in that, the thickness of the bottom (110) is uniform, and the thickness of the side wall (130) is uniform.

3. The pot body (100) according to claim 1, characterized in that, the thickness of the transition section (120) gradually increases along the direction towards the bottom (110), and / or at least part of the thickness of the bottom (110) is greater than or equal to the thickness of the transition section (120).

4. The pot body (100) according to any one of claims 1 to 3, characterized in that, the pot body (100) includes: a pot base body (140); a magnetic conductive coating (150), and the magnetic conductive coating (150) is provided on the outer surface of the lower part of the pot base body (140).

5. The pot body (100) according to claim 4, characterized in that, the thickness of the magnetic conductive coating (150) corresponding to the position of the bottom (110) is greater than the thickness of the magnetic conductive coating (150) corresponding to the transition section (120) and / or the side wall (130).

6. The pot body (100) according to any one of claims 1 to 3, characterized in that, the pot body (100) further includes a pot rim, the pot rim is connected to one end of the side wall (130) away from the transition section (120), and the thickness of the pot rim is greater than the thickness of the side wall (130).

7. The pot body (100) according to any one of claims 1 to 3, characterized in that, a heat concentrating ring (121) is provided on the transition section (120) along its height direction.

8. The pot body (100) according to claim 7, characterized in that, the heat concentrating ring (121) is an annular groove or an annular rib.

9. The pot body (100) according to claim 8, characterized in that, the annular groove is a flared groove, and / or, a chamfer is provided at the opening of the annular groove.

10. The pot body (100) according to claim 9, characterized in that, the aspect ratio of the annular groove is 1 / 5 - 1 / 2; and / or, the opening width of the annular groove is 1.5 mm - 4 mm, the depth of the annular groove is 0.2 mm - 1 mm; and / or, the cross-section of the annular groove is an isosceles trapezoid, and the angle of the obtuse angle of the isosceles trapezoid is 100° - 150°.

11. The pot body (100) according to claim 7, characterized in that, there are multiple heat concentrating rings (121), and the multiple heat concentrating rings (121) are arranged at intervals along the height direction of the transition section (120).

12. The pot body (100) according to claim 8, characterized in that, A plurality of the energy concentrating rings (121) are evenly distributed at equal intervals along the height direction of the transition section (120), and the ratio of the opening width of the annular groove to the interval distance between the plurality of energy concentrating rings (121) is 1 / 19 - 1 / 2.

13. A cooking appliance, characterized in that, it comprises: the pot body (100) according to any one of claims 1 to 12; a mounting seat, the mounting seat forming an accommodating space for the pot body (100); a heating device, arranged on the mounting seat and adapted to heat the pot body (100). The side wall (130) includes a transition section (120) and a side wall (130), the transition section (120) connecting the bottom of the pot (110), and the side wall (130) connecting the transition section (120).

14. A method for manufacturing the pot body (100) according to any one of claims 1 to 12, characterized in that, it includes: a casting step of pouring molten metal into the cavity of a mold and solidifying to obtain a semi-finished product; a forging step of forging the semi-finished product with a punch for liquid die forging to obtain a transition semi-finished product; a surface treatment step of demolding and cooling the transition semi-finished product and performing surface treatment to obtain the pot body (100).

15. According to the method for manufacturing the pot body (100) as claimed in claim 14, characterized in that, before the casting step, the cavity of the mold is preheated; in the forging step, the transition semi-finished product is subjected to a pressure holding treatment for a set time; in the surface treatment step, it includes: sequentially performing surface sandblasting, high-temperature degreasing, spraying of a magnetic conductive coating (150), and spraying of a non-stick coating on the transition semi-finished product.

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