Face cover and cooking apparatus

Abstract

The application relates to a face cover and a cooking equipment. When the internal component is designed, two thinning portions distributed along a first direction are used to enclose a first area and a second area near the face cover body. In the injection molding of the face cover body, after the melt is injected from a first injection gate, the required flow of the melt is relatively reduced when the internal component is molded at the thinning portions. Therefore, the flow of the melt towards the side of the thinning portions is blocked, and more melt is guided from the positions of the first area and the second area to the position of the face cover body to fill the molded face cover body. Since the second area is arranged away from or towards the cavity relative to the first area, a non-straight path is formed between the second area and the first area, the metal particles form a gradual orientation, and the probability of appearance of appearance defects such as orientation flow lines, light and dark bands, gloss difference and weld lines of the face cover body is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of cooking utensil technology, and in particular to noodle covers and cooking equipment. Background Technology

[0002] In cooking equipment, such as rice cookers, the lid is the "face" of the product, and its appearance directly affects consumers' purchasing decisions. Traditionally, surface treatments such as spraying or electroplating are used to achieve a high-end metallic visual effect. However, spraying or electroplating processes raise environmental concerns such as volatile organic compound emissions, heavy metal pollution, and wastewater discharge, which are inconsistent with the current trend of green manufacturing.

[0003] As consumers increasingly demand environmentally friendly and healthy products, paint-free materials have been introduced into related fields due to their environmental advantages. However, paint-free finishes are prone to appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines, resulting in low product qualification rates. Summary of the Invention

[0004] Therefore, it is necessary to provide a lid and cooking equipment that reduces the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines, improves the appearance effect, and thus improves the product qualification rate.

[0005] A faceplate includes: an internal component; and a faceplate body surrounding the outer periphery of the internal component and connected to the internal component to enclose and form a cavity. The internal component includes a first casting position and two thinned portions distributed and connected on both sides of the first casting position along a first direction. The ends of the two thinned portions along a second direction are located at or near the faceplate body, forming a first region and a second region distributed along the second direction between them. The second region is closer to the faceplate body than the first region, and the second region is bent relative to the first region along a side away from or towards the cavity. The first casting position is at least partially located within the first region. The first direction is the width direction of the faceplate, and the second direction is the length direction of the faceplate.

[0006] In the aforementioned cover, the internal components are structurally designed with two thinning sections distributed along a first direction. These two thinning sections enclose a first region and a second region near the cover body. Simultaneously, a first injection gate is located within the first region, with two thinning sections surrounding one side of the first injection gate. Thus, during the injection molding of the cover body, after the melt is injected from the first injection gate, the required flow rate is relatively reduced when molding the thinning sections of the internal components. Therefore, the flow of the melt towards the thinning section is obstructed, allowing more melt to be guided from the locations of the first and second regions into the location of the cover body to fill and mold the cover body. Furthermore, since the second region is positioned relative to the first region along a path away from or towards the cavity, the path between the second and first regions is not a direct flow path. In this way, during injection molding, the melt can be decomposed into multiple flow paths with gradually changing directions, reducing the probability of high-speed impact in one direction. This changes the single orientation of metal particles under traditional direct flow conditions, allowing the metal particles to form a gradual orientation. This effectively reduces the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines on the main body of the cover, improving the appearance quality of the main body of the cover and thus increasing the product qualification rate.

[0007] In some embodiments, the spacing between the two thinned portions along the first direction gradually increases in the direction from the first region to the second region.

[0008] It can be seen that the distance between the two thinning sections in the first direction gradually widens from the first region to the second region, so that the melt flowing through the first region and the second region is in a gradually expanding flow state, thereby gradually expanding the melt flow direction, further reducing the local shear concentration problem caused by traditional unidirectional high-speed filling, effectively changing the arrangement orientation of metal particles, and reducing the probability of appearance defects.

[0009] In some embodiments, the thickness of the internal components within the second region gradually decreases from one end of the second region closer to the first region to the other end of the second region closer to the cover body.

[0010] Therefore, it can be seen that the cavity space in the second region gradually shrinks in the direction towards the main body of the cover, which makes the flow rate change during the melt filling process more gradual. It will not cause obvious layering deviation in the arrangement and orientation of metal particles due to sudden changes in flow rate, further reducing the possibility of light and dark bands and flow lines. At the same time, the thickness tapering design can also ensure that the melt has sufficient power and flow rate to better fill the main body of the cover and improve the stability of the cover molding quality.

[0011] In some embodiments, the thickness of the internal component on the end of the second region near the faceplate body is less than the thickness of the faceplate body.

[0012] Therefore, it can be seen that the melt speed at the beginning of filling the main body of the cover can be slowed down, avoiding the melt from rushing directly into the cavity corresponding to the main body of the cover at high speed, further adjusting the arrangement of metal particles, reducing the generation of flow defects, and at the same time ensuring that the melt has enough power to complete the filling of the main body of the cover, thus taking into account both molding quality and molding efficiency.

[0013] In some embodiments, the thickness of the internal component on the end of the second region near the main body of the cover is denoted as T1, and the thickness of the main body of the cover is denoted as T0, wherein 0.3≤T1 / T0≤0.6.

[0014] Therefore, when the ratio of T1 to T0 is in this range, it can effectively slow down the speed at which the melt rushes into the main cavity of the cover through sufficient thickness difference, avoiding the formation of a single orientation of metal particles due to high-speed impact of the melt, and will not cause the melt flow rate to be too slow due to excessive thickness difference, thus affecting the filling efficiency and balancing the forming efficiency and integrity of the cover.

[0015] In some embodiments, a plane located at the center of the cover along the first direction and perpendicular to the first direction is a center plane. The center plane intersects with the outer surface of the cover body and the surface of the second region facing the cavity to form a first contour line and a second contour line, respectively. The apparent angle between the tangent of the first contour line near the end of the internal component and the height direction of the cover is denoted as θ1. The bending angle between the tangent of the second contour line near the end of the cover body and the height direction of the cover is denoted as θ2. Wherein, when θ1≤10°, θ2≥45°; when θ1≥45°, θ2≤20°.

[0016] Therefore, different bending angles can be set according to the different appearance angles of the main body of the cover, so as to effectively change the original single flow direction of the melt when forming the main body of the cover of different specifications, break the original single arrangement trend of metal particles, and further reduce the probability of various appearance defects of the main body of the cover.

[0017] In some embodiments, the internal component is provided with a flow-blocking groove, which is located on the side of the thinned portion along the second direction and away from the first region, and the flow-blocking groove extends along the first direction.

[0018] Therefore, it can be seen that the flow-blocking groove can further block the melt flowing towards the thinning section. In conjunction with the thinning section, it can form a multi-level stepped buffer, perform multi-gradient control on the melt flow path, reduce the speed of the melt flowing in this direction, further increase the melt flow towards the first region and the second region, better avoid the melt from merging at the main body of the cover to form a weld line, and improve the appearance quality of the cover.

[0019] In some embodiments, the number of flow-blocking channels includes at least two, and the flow-blocking channels are spaced apart along the second direction.

[0020] Therefore, it can be seen that multiple flow-blocking grooves can form multi-level buffers along the melt flow direction, and perform multi-gradient control on the melt flow path, which significantly improves the appearance defects such as orientation flow lines and weld lines generated by paint-free materials during injection molding, and further ensures that the overall appearance quality of the cover is uniform and consistent.

[0021] In some embodiments, the depth of the flow-blocking groove is denoted as D, the thickness of the main body of the cover is denoted as T0, the dimension of the flow-blocking groove along the second direction is denoted as W, and the center distance between adjacent grooves in the first pouring position and each flow-blocking groove is denoted as L; wherein, 3≤W / T0≤8; and / or, 0.3≤D / T0≤0.8; and / or, 4≤L / W≤10.

[0022] It can be seen that by gradually coordinating the parameters at different levels, a nonlinear decreasing shear field is formed in the melt during the filling process, thereby achieving gradual attenuation of melt flow rate and gradual control of metal particle orientation angle. This reduces the optical reflection difference caused by the directional arrangement of high metal content paint-free materials, and thus improves the filling effect of the cover.

[0023] In some embodiments, there are three flow-restricting channels, namely a first flow-restricting channel, a second flow-restricting channel, and a third flow-restricting channel. The distance between the center of the first flow-restricting channel and the center of the first pouring position is denoted as L1, the distance between the center of the second flow-restricting channel and the center of the first flow-restricting channel is denoted as L2, and the distance between the center of the third flow-restricting channel and the center of the second flow-restricting channel is denoted as L3. When the maximum capacity of the cooking equipment is 3L, 20mm≤L1≤30mm, 50mm≤L2≤60mm, and 90mm≤L3≤110mm. When the maximum capacity of the cooking equipment is 4L, 40mm≤L1≤50mm, 60mm≤L2≤70mm, and 60mm≤L3≤80mm.

[0024] Therefore, it can be seen that for the lids of cooking equipment with different capacities, the spacing between each flow-blocking groove can be reasonably adjusted to ensure the buffering and control effect of the flow-blocking groove on the melt. This can effectively slow down the high-speed direct rush of the melt, and prevent insufficient filling power of the melt due to unreasonable spacing. It can adapt to the molding requirements of lid bodies of different sizes, further reduce the probability of appearance defects, and ensure that the lids of cooking equipment with different capacities can obtain stable and good appearance quality.

[0025] In some embodiments, the internal component is further provided with a first buffer recess, which is located on the side of the flow-blocking groove along the second direction and away from the thinning portion, and the extension direction of the first buffer recess is set at an acute angle to the extension direction of the flow-blocking groove.

[0026] Therefore, it can reduce sudden changes in the welding speed, reduce the melt convergence angle, reduce the accumulation of metal particles in the melt, eliminate whitening of the weld line, and improve the filling appearance quality of the cover.

[0027] In some embodiments, the internal component further includes a second gating position, and at least one flow-blocking groove is distributed between the second gating position and the thinning portion along a second direction.

[0028] Therefore, during the injection molding process, after the melt enters from the first injection station and begins to fill the main body of the cover, the melt can be injected into the second injection station to supplement the injection of sufficient melt. This can not only improve the overall filling efficiency, but also increase the melt pressure in the welding area to a certain extent, further improving the appearance quality of the cover. At the same time, it can also adapt to the molding and filling needs of large-size covers and avoid the problem of insufficient filling caused by insufficient material injection in a single injection.

[0029] In some embodiments, the internal component is further provided with a second buffer recess, which is located on the side of the flow-blocking groove along the second direction and away from the thinning portion, and the extension direction of the second buffer recess is perpendicular to the extension direction of the flow-blocking groove.

[0030] Therefore, it can be seen that the overall flow rate of the melt can be reduced, further reducing the speed change in the welding area, reducing the melt convergence angle, and further improving the filling appearance quality of the cover.

[0031] In some embodiments, the material of the face cover body includes metal additives, which account for 1% to 3% of the weight of the face cover body material.

[0032] Therefore, it can be seen that using this amount of metal additives can give the main body of the cover a uniform and delicate metallic luster, which meets the requirements of aesthetic design. At the same time, the structural design of the cover can meet the molding requirements of the metal additives without spraying, effectively avoiding flow lines and weld line defects caused by high metal additive content, and taking into account both appearance and molding quality.

[0033] A cooking appliance comprising the lid described in any of the preceding claims.

[0034] The aforementioned cooking equipment uses the above-mentioned lid. During the injection molding of the lid, the required flow rate is relatively reduced when molding the thinned portion of the internal components. Therefore, the flow of the melt towards the thinned portion is obstructed, allowing more melt to be guided from the locations of the first and second regions into the second cavity to fill the main body of the lid. Furthermore, since the second region is positioned relative to the first region, either away from or towards the cavity, the path between the second and first regions is not a direct flow. This allows the melt to be decomposed into multiple gradually changing flow paths during injection molding, reducing the probability of high-speed unidirectional impact. It also changes the single orientation of metal particles under traditional direct flow conditions, causing the metal particles to form a gradually changing orientation. This effectively reduces the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines on the main body of the lid, improving the appearance quality of the lid and thus increasing the product qualification rate. Attached Figure Description

[0035] Figure 1 This is a structural diagram of the cooking apparatus described in some embodiments of this application.

[0036] Figure 2 This is a structural diagram of the back of an internal component with a capacity of 3L as described in some embodiments of this application.

[0037] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle circle.

[0038] Figure 4 The front structure of the 3L capacity internal component described in some embodiments of this application. Figure 1 .

[0039] Figure 5 for Figure 4 A cross-sectional view of the structure along the BB direction.

[0040] Figure 6 for Figure 5 Enlarged view of the structure at point C in the middle circle.

[0041] Figure 7 For about Figure 6 A schematic diagram of the deformed structure in the diagram.

[0042] Figure 8 This is a structural view of the front of the internal component with a capacity of 4L as described in some embodiments of this application.

[0043] Figure 9 for Figure 8 A cross-sectional view of the structure along the DD direction.

[0044] Figure 10 The structure of the front of the internal component with a capacity of 3L as described in some embodiments of this application. Figure 2 .

[0045] Figure 11 for Figure 10 Cross-sectional view of the structure along the EE direction.

[0046] Figure 12 This is a structural diagram of the faceplate injection molding process described in some embodiments of this application.

[0047] Figure 13 This is a structural diagram of the mold described in some embodiments of this application.

[0048] Figure 14 This is a simulation illustration of a 3L capacity faceplate as described in some embodiments of this application. Figure 1 .

[0049] Figure 15 This is a simulation illustration of a 3L capacity faceplate as described in some embodiments of this application. Figure 2 .

[0050] Figure 16 This is a simulation illustration of a 4L capacity faceplate as described in some embodiments of this application. Figure 1 .

[0051] Figure 17 This is a simulation illustration of a 4L capacity faceplate as described in some embodiments of this application. Figure 2 .

[0052] 10. Internal component; 11. First pouring position; 12. Thinning section; 13. First region; 14. Second region; 141. Second outline; 15. Flow barrier; 151. First flow barrier; 152. Second flow barrier; 153. Third flow barrier; 16. First buffer recess; 17. Second buffer recess; 18. Second pouring position; 1a. First end; 1b. Second end; 1c. Center; 20. Main body of the cover; 21. First outline; 22. Cavity; 30. Center plane; X, First direction; Y, Second direction; Z, Height direction; 40. Mold; 41. First cavity; 42. Second cavity; 43. Sprue; 50. Flow supply assembly; 51. Main runner; 52. First branch runner; 53. Second branch runner; 60. Flow divider assembly; 61. First branch runner; 62. Second branch runner; 63. Receiving nozzle; 70. Base; 71. Outer shell; 73. Glass panel; 74. Button. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0059] In cooking equipment, such as rice cookers, the lid is the "face" of the product, and its appearance directly affects consumers' purchasing decisions. Traditionally, surface treatments such as spraying or electroplating are used to achieve a high-end metallic visual effect. However, spraying or electroplating processes raise environmental concerns such as volatile organic compound emissions, heavy metal pollution, and wastewater discharge, which are inconsistent with the current trend of green manufacturing.

[0060] As consumers increasingly demand environmentally friendly and healthy products, paint-free materials have been introduced into related fields due to their environmental advantages. To obtain paint-free covers with a metallic texture, paint-free materials typically contain a high proportion of metallic substances. However, in traditional cover injection molding, the resulting panels are prone to appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines, leading to a low product qualification rate.

[0061] Based on this, please refer to Figures 1 to 5This application provides a faceplate, comprising an internal component 10 and a faceplate body 20. The faceplate body 20 surrounds the outer periphery of the internal component 10 and is connected to the internal component 10 to enclose and form a cavity 22. The internal component 10 includes a first casting position 11 and two thinned portions 12 distributed and connected on both sides of the first casting position 11 along a first direction X. The two thinned portions 12 are located at or adjacent to the faceplate body 20 along a second direction Y, forming a first region 13 and a second region 14 distributed along the second direction Y between them. The second region 14 is closer to the faceplate body 20 than the first region 13, and the second region 14 is bent relative to the first region 13 along a side away from or towards the cavity 22. The first casting position 11 is at least partially located within the first region 13. The first direction X is the width direction of the faceplate, and the second direction Y is the length direction of the faceplate.

[0062] In the structural design of the internal component 10 of the aforementioned cover, two thinning portions 12 are distributed along the first direction X, such that the two thinning portions 12 enclose the first region 13 and the second region 14 near the cover body 20. Simultaneously, the first injection gate 11 is located within the first region 13, with two thinning portions 12 surrounding one side of the first injection gate 11. Thus, during the injection molding of the cover body 20, after the melt is injected from the first injection gate 11, the required flow rate is relatively reduced when molding the thinning portions 12 of the internal component 10. Therefore, the flow of the melt towards the thinning portion 12 is obstructed, allowing more melt to be guided from the locations of the first region 13 and the second region 14 into the location of the cover body 20 to fill and mold the cover body 20. Furthermore, since the second region 14 is positioned relative to the first region 13, either away from or towards the cavity 22, the path between the second region 14 and the first region 13 is not a direct flow path. In this way, during injection molding, the melt can be decomposed into multiple flow paths with gradually changing directions, reducing the probability of high-speed impact in one direction. This changes the single orientation of metal particles under the traditional direct flow condition, allowing the metal particles to form a gradual orientation, effectively reducing the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines on the cover, improving the appearance quality of the cover, and thus increasing the product qualification rate.

[0063] It should be noted that the first injection gate 11 refers to the starting position where the melt fills the internal component 10 during the injection molding process, which corresponds to the gate 43 on the mold 40. When the melt enters the mold 40 through the gate 43, the melt preferentially flows through the first injection gate 11; then, it fills and forms part of the structure of the internal component 10; then, it flows from the position of the internal component 10 to and fills the cover body 20; finally, it fills and forms the internal component 10 and the cover body 20. The first injection gate 11 can be positioned on the internal component 10 in various ways. For example, the first injection gate 11 can be located on the side of the internal component 10 facing the cavity 22, or it can be located on the side of the internal component 10 away from the cavity 22. At the same time, the first injection gate 11 can also be located on the side of the center of the internal component 10 along the first direction X, or it can be located on the side of the center of the internal component 10 along the second direction Y.

[0064] For specific examples, please refer to Figure 2 The internal component 10 includes a first end 1a and a second end 1b distributed along the second direction Y, and a central portion 1c located between the first end 1a and the second end 1b. The first injection point 11 and the two thinning portions 12 are both located on the side of the central portion 1c facing the second end 1b. When the cooking device includes a housing 71 and a cover rotatably mounted on the housing 71, the first end 1a is located near the rotatable connection end of the cover on the housing 71, and the second end 1b is located near the rotatable opening end of the cover on the housing 71. Furthermore, the shortest distance between the first injection point 11 and the second end 1b in the second direction Y can be determined according to the actual injection molding process and the properties of the melt material.

[0065] The thinning section 12 refers to a portion of the internal component 10 that is thinner than its surrounding structure. It allows for control of the melt flow during injection molding, causing more melt flowing from the first injection point 11 to flow towards the locations of the first region 13 and the second region 14. For example, the thickness of the internal component 10 in the thinning section 12 is less than the thickness of the internal components 10 on the outer periphery of the thinning section 12; of course, in some examples, the thickness of the internal component 10 at the thinning section 12 may also be less than the thickness of the internal components 10 in the first region 13 and / or the second region 14.

[0066] In injection molding, after the melt fills the first injection position 11, it can flow along opposite sides of the second direction Y. For example, a portion of the melt can flow toward the location of the first region 13 and the second region 14 and fill the cover body 20; another portion of the melt can flow toward one side of the thinned portion 12, thereby flowing toward and filling the cover body 20. If these two melts eventually fuse or cover at a certain position on the cover body 20, the resulting cover body 20 is prone to appearance defects such as weld lines.

[0067] Therefore, in this embodiment, a thinning portion 12 is provided on one side of the first gating position 11. Correspondingly, the space size of the cavity inside the mold 40 at the thinning portion 12 is relatively reduced. This reduces the melt flow rate in the thinning portion 12, increases the resistance of the melt at the thinning portion 12, and slows down the flow rate of the melt from the first gating position 11 toward the thinning portion 12. At the same time, it increases the flow rate toward the locations of the first region 13 and the second region 14, so that the cover body 20 can be formed by the melt filling in this direction, avoiding the two streams from filling and connecting on the cover body 20, and reducing the probability of weld lines.

[0068] The thinning portion 12 can have various structural designs on the internal member 10. For example, the surface of the internal member 10 facing the cavity 22 can be recessed inward to form the thinning portion 12; or, the surface of the internal member 10 facing away from the cavity 22 can be recessed inward to form the thinning portion 12; or, both opposing surfaces of the internal member 10 can be recessed inward to jointly form the thinning portion 12.

[0069] Meanwhile, the thinning portion 12 can be positioned in various ways on the internal component 10. For example, the thinning portion 12 can be located on one side of the center of the internal component 10 along the second direction Y, or it can be located on one side of the center of the internal component 10 along the first direction X. One end of each thinning portion 12 along the second direction Y can extend to the cover body 20, or it can extend toward the cover body 20, but a certain gap is maintained between it and the cover body 20.

[0070] The first region 13 and the second region 14 refer to two regions enclosed by the two thinning portions 12 and the cover body 20. The first region 13 and the second region 14 are distributed sequentially along the second direction Y, with the second region 14 being closer to the cover body 20 than the first region 13. Due to the design of the thinning portions 12, during injection molding, more melt is guided towards the locations of the first region 13 and the second region 14 for flow and filling, thereby initiating the filling and formation of the cover body 20. Simultaneously, the first injection gate 11 can be entirely located in the first region 13; alternatively, it can be partially located in the first region 13 and partially located on the thinning portions 12.

[0071] When more melt is guided to fill the positions of the first region 13 and the second region 14, if the filling path formed between the first region 13 and the second region 14 is a straight path, the melt will flow straight at high speed, which can easily cause the metal material to be arranged in a single direction in the first region 13 and the second region 14, resulting in appearance defects such as orientation flow lines, light and dark bands, and poor gloss on the surface.

[0072] Therefore, in this embodiment, the second region 14 is bent relative to the first region 13 along the side away from or towards the cavity 22, so that the first region 13 and the second region 14 can present a V-shaped structure or approximately V-shaped structure. In this way, the flow path between the two is not straight, which can decompose the melt into multiple flow paths with gradually changing directions, reduce the probability of high-speed impact in one direction, change the single arrangement orientation of metal particles under the traditional straight impact, and make the metal particles form a gradual orientation, effectively reducing the probability of appearance defects such as orientation flow lines, light and dark bands, and poor gloss on the main body of the cover 20.

[0073] In this design, the second region 14 bends relative to the first region 13 along the side away from the cavity 22. This can be understood as the end of the second region 14 furthest from the first region 13 shifting relative to the end of the second region 14 closest to the first region 13 along the side away from the cavity 22. (Refer to...) Figure 6 Similarly, the second region 14 bends relative to the first region 13 along the side facing the cavity 22. This can be understood as the end of the second region 14 away from the first region 13 shifting relative to the end of the second region 14 closer to the first region 13 along the side facing the cavity 22. (See reference...) Figure 7 .

[0074] To further reduce unidirectional high-speed impact, when the second region 14 bends relative to the first region 13 along the side away from the cavity 22, the first injection point 11 can be set on the side of the first region 13 away from the cavity 22. This way, the molten material feeds into the first injection point 11 in the direction towards the cavity 22, and the bend of the second region 14 away from the cavity 22 causes the molten material to flow towards the cover body 20 in the opposite direction to the feed direction, greatly reducing the probability of unidirectional high-speed impact. Similarly, when the second region 14 bends relative to the first region 13 along the side towards the cavity 22, the first injection point 11 can be set on the side of the first region 13 towards the cavity 22.

[0075] In addition, orientation flow lines refer to unstable melt flow, resulting in wavy or radial stripes on some parts of the cover body 20, with relatively blurred boundaries, resembling water ripples. Light and dark bands refer to banded structures with inconsistent brightness on the cover body 20. Poor gloss refers to the gloss level of the cover body 20 not meeting the required standards; various measurement methods can be used, such as, but not limited to, a 60° angle gloss meter. Weld lines refer to the convergence of material flow on the cover body 20, generally appearing as straight lines, arcs, or Y-shaped lines, and may have a slight grooved feel.

[0076] Further, please refer to Figure 3The distance between the two thinning sections 12 along the first direction X gradually increases from the first region 13 to the second region 14. Therefore, the distance between the two thinning sections 12 along the first direction X gradually widens from the first region 13 to the second region 14, causing the melt flowing through the first region 13 and the second region 14 to exhibit a gradually expanding flow state. This gradually expands the melt flow direction, further reducing the local shear concentration problem caused by traditional unidirectional high-speed filling, effectively changing the arrangement and orientation of metal particles, and reducing the probability of appearance defects.

[0077] It should be noted that the spacing between the two thinning sections 12 is designed to gradually expand in the second direction Y. This allows the melt to gradually expand outward under the guidance of the location of the thinning section 12, avoiding the single orientation of metal particles caused by the high-speed direct flow of the melt. This allows the metal particles to gradually adjust their orientation during the gradual expansion flow, further improving the uniformity of the surface appearance and reducing defects such as orientation flow lines, light and dark bands, and poor gloss.

[0078] The width of the thinning portion 12 can remain unchanged in the second direction Y; or it can be larger as it gets closer to the main body 20 of the cover, which will have a greater resistance to the melt and thus better constrain and guide the melt that is about to fill the main body 20 of the cover.

[0079] The width of the thinning part 12 can be set according to the actual specifications of the cover. For example, the width of the thinning part 12 can be, but is not limited to, 5mm to 10mm.

[0080] In some embodiments, please refer to Figure 6 The thickness of the internal components 10 within the second region 14 gradually decreases from the end of the second region 14 near the first region 13 to the end of the second region 14 near the main body 20 of the cover. This means that the cavity space within the second region 14 gradually shrinks towards the main body 20 of the cover, resulting in a smoother change in flow rate during the melt filling process. This prevents significant delamination of the metal particle arrangement due to sudden changes in flow rate, further reducing the possibility of bright and dark bands and flow lines. Simultaneously, the gradually decreasing thickness design ensures that the melt has sufficient kinetic energy and flow rate to better fill the main body 20 of the cover, improving the stability of the cover molding quality.

[0081] It should be noted that the second region 14 is designed with a gradual transition structure to facilitate the smooth flow of fluid into the location of the cover body 20. As the distance between the two thinned sections 12 gradually increases from the direction along the first region 13 towards the second region 14, the flow of the melt in the second region 14 gradually expands in the first direction X, reducing the probability of high-speed direct flow in a single direction. At the same time, since the thickness of the second region 14 is designed with a gradually decreasing structure, the flow velocity of the expanding melt can change synchronously and smoothly, ensuring that the melt along the first direction X has sufficient power and flow velocity, allowing the melt to better fill the cover body 20.

[0082] In some embodiments, please refer to Figure 6 The thickness of the internal component 10 on the end of the second region 14 near the main body 20 is less than the thickness of the main body 20. This slows down the melt velocity at the beginning of filling the main body 20, preventing the melt from directly and rapidly entering the cavity corresponding to the main body 20. This further adjusts the arrangement of metal particles, reduces flow defects, and ensures the melt has sufficient power to complete the filling of the main body 20, balancing molding quality and molding efficiency.

[0083] Further, please refer to Figure 6 The thickness of the internal component 10 on the end of the second region 14 near the main body 20 of the cover is denoted as T1, and the thickness of the main body 20 of the cover is denoted as T0, where 0.3≤T1 / T0≤0.6. Therefore, when the ratio of T1 to T0 is within this range, a sufficient thickness difference can effectively slow down the speed at which the melt flows into the cavity of the main body 20 of the cover, preventing the high-speed impact of the melt from causing the metal particles to form a single orientation. At the same time, an excessive thickness difference will not cause the melt flow rate to be too slow, affecting the filling efficiency, thus balancing the forming efficiency and integrity of the cover.

[0084] It should be noted that the ratio of T1 to T0 can be between 0.3 and 0.6, such as, but not limited to, 0.3, 0.4, 0.5, or 0.6. In some examples, the thickness T1 can be 0.8 mm, and the thickness T1 can be between 2.5 mm and 3.0 mm.

[0085] In some embodiments, please refer to Figure 4 and Figure 6A central plane 30 is located at the center of the cover along the first direction X and perpendicular to the first direction X. The central plane 30 intersects with the outer surface of the cover body 20 and the surface of the second region 14 facing the cavity 22 to form a first contour line 21 and a second contour line 141. The appearance angle between the tangent of the end of the first contour line 21 near the internal component 10 and the height direction Z of the cover is denoted as θ1. The bending angle between the tangent of the end of the second contour line 141 near the cover body 20 and the height direction Z of the cover is denoted as θ2. Wherein, when θ1≤10°, θ2≥45°; when θ1≥45°, θ2≤20°. It can be seen that different bending angles can be set according to different appearance angles of the cover body 20 to ensure that the original single flow direction of the melt can be effectively changed when forming cover bodies 20 of different specifications, breaking the original single arrangement trend of metal particles, and further reducing the probability of various appearance defects of the cover body 20.

[0086] It should be noted that a smaller included angle indicates a greater degree of inward bending of the top of the faceplate body 20, suggesting a relatively smaller faceplate size. For example: Please refer to... Figure 8 and Figure 9 When the included angle θ1 is less than or equal to 10°, the maximum capacity of the cooking equipment can be the first capacity. Please refer to... Figure 4 and Figure 6 When the included angle θ1 is greater than or equal to 45°, the maximum capacity of the cooking equipment can be the second capacity, and the first capacity is greater than the second capacity. Here, the maximum capacity of the cooking equipment refers to the maximum capacity of the inner pot within the cooking equipment.

[0087] In some specific examples, the first capacity can be 4L and the second capacity can be 3L.

[0088] When the included angle θ1 is less than or equal to 10°, the bending angle can be greater than or equal to 45°, such as, but not limited to, 45°, 47°, 49°, 50°, 52°, 54°, 55°, 56°, 58°, 60°, 70°, 80°, etc. In some examples, the bending angle θ2 can be 45°~50°.

[0089] When the included angle θ1 is greater than or equal to 45°, the bending angle can be less than or equal to 20°, for example, but not limited to 5°, 10°, 15°, 16°, 17°, 18°, 19°, 20°, etc. In some examples, the bending angle θ2 can be 15°~20°.

[0090] Meanwhile, it should be noted that the bending angle is the angle between the tangent of the end of the second contour line 141 closest to the main body 20 of the cover and the height direction Z of the cover. Therefore, the closer the vertical bending angle is to 90°, the closer the tangent of the second contour line 141 is to horizontal, and the weaker its bending degree. Thus, in this embodiment, the smaller the external angle θ1, the larger the maximum capacity of the cooking device with this cover, the larger the area of ​​the main body 20 of the cover, and the more filling. Therefore, designing a relatively large bending angle can reduce the bending degree of the second region 14, ensuring a smooth melt flow path while reducing the probability of high-speed straight flow in one direction, avoiding excessive melt filling resistance due to excessive bending, and ensuring that the large-sized main body 20 can be fully filled and formed. The larger the included angle θ1, the smaller the maximum capacity of the cooking equipment, the smaller the area of ​​the main body 20 of the cover, and the less filling. In this case, designing the bending angle to be smaller and increasing the bending degree of the second region 14 can more effectively change the flow direction of the melt and better avoid appearance defects caused by unidirectional high-speed impact on the small-sized main body 20 of the cover.

[0091] Furthermore, the center plane 30 of the cover refers to a plane passing through the center of the cover and parallel to the second direction Y, which can also be understood as the central plane in the width direction of the cover. In some specific examples, the two thinned portions 12 can be symmetrically arranged about the center plane 30. At the same time, when the internal component 10 includes a first end 1a and a second end 1b distributed along the second direction Y, and a central portion 1c located between the first end 1a and the second end 1b, the central portion 1c and the first casting position 11 can both be located on the center plane 30.

[0092] In some embodiments, please refer to Figure 2 The internal component 10 is provided with a flow-blocking groove 15, which is located on the side of the thinning section 12 along the second direction Y and away from the first region 13, and extends along the first direction X. It can be seen that the flow-blocking groove 15 can further block the melt flowing towards the thinning section 12. In conjunction with the thinning section 12, it can form a multi-level stepped buffer, perform multi-gradient control on the melt flow path, reduce the speed of the melt flowing in this direction, further increase the melt flow towards the first region 13 and the second region 14, better prevent the melt from merging at the position of the cover body 20 to form a weld line, and improve the appearance quality of the cover.

[0093] It should be noted that the internal component 10 is provided with a flow-blocking groove 15, and correspondingly, a protruding structure can be provided in the cavity of the mold 40. During injection molding, the melt flows through the protruding structure to form the flow-blocking groove 15 of the internal component 10. At the same time, due to the design of the flow-blocking groove 15, the melt flowing towards the thinning section 12 is reliably blocked during the injection molding process, ensuring a stable flow-blocking effect.

[0094] The flow-blocking groove 15 can be disposed on the side of the internal component 10 facing the cavity 22, or on the side of the internal component 10 away from the cavity 22; of course, it can also be disposed on both opposite surfaces of the internal component 10. When the flow-blocking groove 15 extends along the first direction X, its end can extend to the face cover body 20; or it can extend close to the face cover body 20, but not connect with the face cover body 20. In this case, the gap between the end of the flow-blocking groove 15 and the face cover body 20 can be designed according to the actual product, and is not limited here.

[0095] The number of flow-blocking grooves 15 can be one or more. When there are multiple flow-blocking grooves 15, each flow-blocking groove 15 can be distributed at intervals along the second direction Y, so that more stepped buffer structures can be formed on one side of the thinning section 12. In this way, a graded shear field is formed through different layered structures, and the energy of melt flow is attenuated in stages.

[0096] In some embodiments, please refer to Figure 2 The number of flow-blocking grooves 15 includes at least two, and each flow-blocking groove 15 is distributed at intervals along the second direction Y. It can be seen that multiple flow-blocking grooves 15 can form multi-level buffers along the melt flow direction, perform multi-gradient control on the melt flow path, significantly improve the appearance defects such as orientation flow lines and weld lines generated by the paint-free material during injection molding, and further ensure the uniformity of the overall appearance quality of the cover.

[0097] The number of flow-blocking grooves 15 can be two, three, or more. In some specific examples, the number of flow-blocking grooves 15 can be three, and the three flow-blocking grooves 15 are distributed at intervals along the second direction Y. At the same time, the spacing between each pair of adjacent flow-blocking grooves 15 can be the same or different.

[0098] In some embodiments, please refer to Figure 2 , Figure 10 and Figure 11 The depth of the flow-restricting groove 15 is denoted as D, the thickness of the main body 20 of the cover is denoted as T0, the dimension of the flow-restricting groove 15 along the second direction Y is denoted as W, and the center distance between adjacent flow-restricting grooves 15 in the first pouring position 11 and each flow-restricting groove 15 is denoted as L; wherein, 3≤W / T0≤8; and / or, 0.3≤D / T0≤0.8; and / or, 4≤L / W≤10. It can be seen that through the gradual coordination between different level parameters, a nonlinear decreasing shear field is formed in the melt during the filling process, realizing the gradual decrease of melt flow rate and the gradual control of the orientation angle of metal particles, thereby reducing the optical reflection difference caused by the directional arrangement of high metal content non-coating materials, and thus improving the filling effect of the main body 20 of the cover.

[0099] The ratio of dimension W to thickness T0 can be between 3 and 8, for example, but not limited to 3, 4, 5, 6, 7, and 8. Similarly, the ratio of depth D to thickness T0 can be between 0.3 and 0.8, for example, but not limited to 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. Furthermore, the ratio of spacing L to dimension W can be between 4 and 10, for example, but not limited to 4, 5, 6, 7, 8, 9, and 10.

[0100] In some embodiments, please refer to Figure 2 There are three flow-restricting channels 15, namely the first flow-restricting channel 151, the second flow-restricting channel 152, and the third flow-restricting channel 153. The distance between the center of the first flow-restricting channel 151 and the center of the first pouring position 11 is denoted as L1, the distance between the center of the second flow-restricting channel 152 and the center of the first flow-restricting channel 151 is denoted as L2, and the distance between the center of the third flow-restricting channel 153 and the center of the second flow-restricting channel 152 is denoted as L3. When the maximum capacity of the cooking equipment is 3L, 20mm≤L1≤30mm, 50mm≤L2≤60mm, and 90mm≤L3≤110mm. When the maximum capacity of the cooking equipment is 4L, 40mm≤L1≤50mm, 60mm≤L2≤70mm, and 60mm≤L3≤80mm. Therefore, it can be seen that for the lids of cooking equipment with different capacities, the spacing between each flow-blocking groove 15 can be reasonably adjusted to ensure the buffering and control effect of the flow-blocking groove 15 on the melt. This can effectively slow down the high-speed rush of the melt and prevent insufficient filling power of the melt due to unreasonable spacing. It can adapt to the molding requirements of lids of different sizes, further reduce the probability of appearance defects, and ensure that the lids of cooking equipment with different capacities can obtain stable and good appearance quality.

[0101] In some specific examples, when the maximum capacity of the cooking device is 3L, L1 is 26mm, L2 is 58mm, and L3 is 100.5mm; when the maximum capacity of the cooking device is 4L, L1 is 41.9mm, L2 is 67.5mm, and L3 is 67mm.

[0102] Furthermore, when the maximum capacity of the cooking equipment is 3L, the width of the first flow-blocking groove 151 can be 12mm, the width of the second flow-blocking groove 152 can be 13mm, and the width of the third flow-blocking groove 153 can be 9.8mm. Meanwhile, the thickness of the internal components 10 in the first flow-blocking groove 151, the second flow-blocking groove 152, and the third flow-blocking groove 153 can all be 1mm.

[0103] With a maximum capacity of 4L for the cooking equipment, the width of the first flow-blocking groove 151 can be 11.3mm, the width of the second flow-blocking groove 152 can be 11.5mm, and the width of the third flow-blocking groove 153 can be 10.6mm. Meanwhile, the thickness of the internal components 10 in the first flow-blocking groove 151, the second flow-blocking groove 152, and the third flow-blocking groove 153 can all be 1mm.

[0104] It should also be noted that a first flow-blocking groove 151 is provided on one side of the thinning section 12, which can establish an initial flow direction, quickly form a stable mainstream, and reduce local turbulence. A second flow-blocking groove 152 is provided on one side of the first flow-blocking groove 151, which can buffer the high-speed shearing formed by the first flow-blocking groove 151, redistribute the melt velocity, and break up the directional aggregation of local metal particles. A third flow-blocking groove 153 is provided on one side of the second flow-blocking groove 152, which can form a low-shear homogenization region, reduce surface orientation difference, and improve gloss uniformity.

[0105] In some embodiments, please refer to Figure 2 The internal component 10 is also provided with a first buffer recess 16. The first buffer recess 16 is located on the side of the flow-blocking groove 15 along the second direction Y and away from the thinning portion 12. The extension direction of the first buffer recess 16 is set at an acute angle to the extension direction of the flow-blocking groove 15. It can be seen that this can reduce the sudden change in the welding speed in the welding area, reduce the melt convergence angle, reduce the accumulation of metal particles in the melt, eliminate the whitening of the weld line, and improve the filling appearance quality of the cover.

[0106] It should be noted that the first buffer recess 16 refers to the structure formed by the inward indentation of the surface of the internal component 10. It can form a certain acute angle with the flow-blocking groove 15, that is, it is radial relative to the flow-blocking groove 15. It can further divert and guide the melt after flow blocking, so that the melts of different diversions can merge more smoothly, and avoid the local stacking of metal particles due to excessive impact force when the melts merge, effectively improving the appearance defects of the welding position.

[0107] The acute angle between the first buffer recess 16 and the flow obstruction groove 15 can be designed in various ways. For example, when the maximum capacity of the cooking device is 3L, the acute angle between the first buffer recess 16 and the flow obstruction groove 15 can be 10°~15°. In some specific examples, the acute angle between the first buffer recess 16 and the flow obstruction groove 15 can be 14°.

[0108] When the maximum capacity of the cooking equipment is 4L, the acute angle between the first buffer recess 16 and the flow obstruction groove 15 can be 15°~25°. In some specific examples, the acute angle between the first buffer recess 16 and the flow obstruction groove 15 can be 20°.

[0109] The number of first buffer recesses 16 can be one or more. For example, there may be two first buffer recesses 16, which are distributed at intervals along the first direction X, and the distance between them gradually increases from the end of the first buffer recess 16 near the flow obstruction groove 15 to the end of the first buffer recess 16 away from the flow obstruction groove 15. In some specific examples, the two first buffer recesses 16 may be symmetrically distributed about the center surface 30 of the cover.

[0110] Furthermore, when the maximum capacity of the cooking device is 3L, the width of the first buffer recess 16 can be 8mm to 12mm, and the depth can be 1.5mm to 3mm. In some specific examples, the width of the first buffer recess 16 can be 8.5mm, and the depth can be 1.5mm.

[0111] Meanwhile, when the maximum capacity of the cooking device is 4L, the width of the first buffer recess 16 can be 10mm~15mm, and the depth can be 2mm~3mm. In some specific examples, the width of the first buffer recess 16 can be 11.5mm, and the depth can be 2mm.

[0112] Further, please refer to Figure 2 and Figure 12 The internal component 10 also includes a second injection station 18, and at least one flow-blocking groove 15 is distributed between the second injection station 18 and the thinning portion 12 along the second direction Y. Therefore, during the injection molding process, after the melt enters from the first injection station 11 and begins to fill the main body 20 of the cover, sufficient melt can be injected into the second injection station 18 to supplement the filling. This not only improves the overall filling efficiency but also increases the melt pressure in the welding area to a certain extent, further improving the appearance quality of the cover. Simultaneously, it can adapt to the molding and filling requirements of large-size covers, avoiding the problem of incomplete filling due to insufficient material in a single injection.

[0113] It should be noted that the timing of injecting melt into the second pouring position 18 is later than the timing of injecting melt into the first pouring position 11. Usually, melt is injected into the second pouring position 18 only when the melt entering from the first pouring position 11 has almost filled the main body 20 of the cover. For example, melt can be injected into the second pouring position 18 when the melt entering from the first pouring position 11 has filled 2 / 3 to 1 / 3 of the main body 20.

[0114] When there are three flow-restricting grooves 15, and the three flow-restricting grooves 15 are distributed at intervals along the second direction Y, there can also be two second pouring positions 18. Each second pouring position 18 can be set between the first flow-restricting groove 151 and the second flow-restricting groove 152. Of course, the position of the second pouring position 18 can also be set in other places.

[0115] In some embodiments, please refer to Figure 2The internal component 10 is also provided with a second buffer recess 17, which is located on the side of the flow-blocking groove 15 along the second direction Y and away from the thinning portion 12. The extension direction of the second buffer recess 17 is perpendicular to the extension direction of the flow-blocking groove 15. Therefore, the overall flow rate of the melt can be reduced, further reducing the velocity change in the welding area, reducing the melt convergence angle, and further improving the filling appearance quality of the cover body 20.

[0116] The number of second buffer recesses 17 can be one or more. In some specific examples, there are multiple second buffer recesses 17, and each second buffer recess 17 is distributed at intervals along the first direction X.

[0117] Meanwhile, the dimensions of the second buffer recess 17 can also be designed in various ways. For example, when the maximum capacity of the cooking device is 3L, the width of the second buffer recess 17 can be 8mm to 12mm, and the depth can be 1.5mm to 3mm. In some specific examples, the width of the second buffer recess 17 can be 9.8mm, and the depth can be 1.5mm.

[0118] Meanwhile, when the maximum capacity of the cooking equipment is 4L, the width of the second buffer recess 17 can be 10mm~15mm, and the depth can be 2mm~3mm. In some specific examples, the width of the second buffer recess 17 can be 11.5mm, and the depth can be 2mm.

[0119] In some embodiments, the material of the cover body 20 includes metal additives, and the weight percentage of the metal additives in the material of the cover body 20 is 1% to 3%. Therefore, using this amount of metal additives enables the cover body 20 to achieve a uniform and delicate metallic luster, meeting the requirements of aesthetic design. Simultaneously, the structural design of the cover allows for the molding requirements of this proportion of metal additives without the need for spraying, effectively avoiding flow lines and weld lines defects caused by high metal additive content, thus balancing aesthetic texture and molding quality.

[0120] It should be noted that metallic additives can include aluminum powder, pearlescent powder, reflective particles, etc. Pearlescent powder includes mica titanium, titanium oxide, glass flakes, organic pearlescent pigments, etc.

[0121] Meanwhile, the material of the faceplate body 20 may also include resin material, which can serve as the base material for the paint-free material. Specifically, in some examples, high-gloss, heat-resistant, food-grade paint-free polypropylene (PP) is used as the base material for the faceplate body 20, with 1% to 3% of metal additives added to the base material. The particle size range of the metal additives can be 5μm to 20μm; the melt flow index of the metal additives is controlled at 35g / 10min to 55g / 10min.

[0122] For ease of understanding, simulation analysis is performed using the lids of cooking appliances with capacities of 3L and 4L. Regardless of the capacity, the internal component 10 of both cooking appliances has a first pouring position 11, two thinning portions 12, three flow-blocking grooves 15, two first buffer recesses 16, and three second buffer recesses 17. There are three flow-blocking grooves 15, designated as first flow-blocking groove 151, second flow-blocking groove 152, and third flow-blocking groove 153. The distance between the center of the first flow-blocking groove 151 and the center of the first pouring position 11 is denoted as L1, the distance between the center of the second flow-blocking groove 152 and the center of the first flow-blocking groove 151 is denoted as L2, and the distance between the center of the third flow-blocking groove 153 and the center of the second flow-blocking groove 152 is denoted as L3. The above features can be defined with reference to the relevant features in the above embodiments.

[0123] In a 3L cooking appliance, the bending angle is 19°, the thickness of the main body 20 is 2.7mm, and the width of the thinned portion 12 is 10mm; L1 is 26mm, L2 is 58mm, and L3 is 100.5mm. The width of the first flow-blocking groove 151 can be 12mm, the width of the second flow-blocking groove 152 can be 13mm, and the width of the third flow-blocking groove 153 can be 9.8mm. Simultaneously, the angle between the first buffer recess 16 and the third flow-blocking groove 153 is 14°, and the width is 8.5mm. The center distance between the second buffer recesses 17 is 54.5mm, the width of the middle second buffer recess 17 is 8.94mm, and the width of the second buffer recesses 17 on both sides is 9.84mm.

[0124] In a 4L cooking appliance, the bending angle is 47°, the thickness of the main body 20 is 2.7mm, and the width of the thinned portion 12 is 8.21mm; L1 is 41.9mm, L2 is 67.5mm, and L3 is 67mm. The width of the first flow-blocking groove 151 can be 11.3mm, the width of the second flow-blocking groove 152 can be 11.5mm, and the width of the third flow-blocking groove 153 can be 10.6mm. Simultaneously, the angle between the first buffer recess 16 and the third flow-blocking groove 153 is 20°, and the width is 11.5mm. The center distance between the second buffer recesses 17 is 94.87mm, the width of the second buffer recess 17 located in the middle is 8.92mm, and the width of the second buffer recesses 17 located on both sides is 8.92mm.

[0125] The above-specified faceplates were analyzed using Moldflow software. A 3D mesh was used, and hot and cold runner systems (using cylindrical meshes) were constructed and assigned corresponding attributes. The analysis series executed a "fill-hold-warpage" analysis with the following parameters: mold temperature 40°C, material temperature 220°C, injection time 2.1s, speed / pressure switching 99%, holding pressure control at 70MPa*8s, cooling time 35s, and small deformation as the warpage type. The causes of warpage were identified. Once these settings were complete, the analysis could be started. The analysis results will show the weld line distribution and the melt shear rate process during filling. For details, please refer to [reference needed]. Figures 14 to 17 .

[0126] from Figure 14 and Figure 16 It can be seen that by optimizing the structure of the internal component 10, the weld line can be transferred to the internal component 10 instead of the face cover body 20, thus avoiding the appearance defect of the weld line on the face cover body 20.

[0127] At the same time, from Figure 15 and Figure 17 It can be seen that by constructing a progressive shear field through a multi-level gradient buffer structure, the melt flow rate, shear energy and particle orientation angle can be coordinated and controlled, so that when the melt fills the main body 20, the first region 13 and the second region 14 can smoothly fill the main body 20, effectively reducing the probability of appearance defects such as orientation flow lines, light and dark bands and poor gloss in the main body 20.

[0128] In addition, by comparing the 3L capacity cooking device of this application with a conventional 3L capacity cooking device through injection molding, it is found that the optical appearance defects caused by the orientation of metal particles can be effectively improved, as shown in Table 1 below.

[0129] Table 1

[0130]

[0131] It should be noted that the traditional structure refers to the internal components 10 and end caps having the same dimensions and basic structure as those in this application, but lacking structural designs such as the thinning section 12, the flow-blocking groove 15, the first buffer recess 16, and the second buffer recess 17. Meanwhile, gloss can be measured using a 60° angle gloss meter, fitted to the flat surface of the product. At least five points should be measured for each sample, avoiding edges and defect areas. The displayed data should be read, and the average value calculated as the final result. Color difference ΔE can be measured using a spectrophotometer or color analyzer. The X, Y, Z values ​​or reflectance spectrum of the sample are measured, converted to the CIELAB color space, and the color difference components (ΔL*, Δa*, Δb*) between the sample and the standard sample are calculated, then the total color difference ΔE is synthesized.

[0132] In some embodiments, please refer to Figure 12 and Figure 13 This application provides a faceplate preparation apparatus for preparing any of the above-mentioned faceplates. The faceplate preparation apparatus includes: an injection mold 40; the injection mold 40 has a gate 43, a first cavity 41 and a second cavity 42 surrounding the first cavity 41. The gate 43 is configured to correspond to the first injection position 11 on the internal component 10. The first cavity 41 is used to allow the melt in the gate 43 to flow in to form the internal component 10. The second cavity 42 is used to allow the melt in the first cavity 41 to flow in to form the faceplate body 20.

[0133] In the aforementioned apparatus for preparing the faceplate, during injection molding, the melt enters the first cavity 41 from the gating gate 43. Since the required flow rate is relatively reduced when molding the thinned portion 12 of the internal component 10, the flow of the melt towards the thinned portion 12 is obstructed. This allows more melt to be guided from the locations of the first region 13 and the second region 14 into the second cavity 42 to fill and mold the faceplate body 20. Furthermore, since the second region 14 is positioned relative to the first region 13, either away from or towards the cavity 22, the path between the second region 14 and the first region 13 is not a direct flow path. This allows the melt to be decomposed into multiple gradually changing flow paths during injection molding, reducing the probability of high-speed impact in one direction. It also changes the single orientation of metal particles under traditional direct flow conditions, causing the metal particles to form a gradually changing orientation. This effectively reduces the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines appearing on the faceplate body 20, improving the appearance quality of the faceplate and thus increasing the product yield.

[0134] It should be noted that mold 40 refers to a tool used for injection molding, which can shape molten raw material into the desired shape of the cover body 20 through a specific cavity structure. In some examples, mold 40 may include a fixed mold and a moving mold, and when the fixed mold and the moving mold are closed, a first cavity 41 and a second cavity 42 may be formed between them.

[0135] The first cavity 41 refers to the cavity 22 structure used to form the internal component 10. After the melt completes its initial distribution and flow in the first cavity 41, it overflows into the second cavity 42 to form a complete cover body 20 structure. The contour of the second cavity 42 matches the outer contour of the final cover body 20, ensuring that the dimensional accuracy of the formed cover body 20 meets the assembly requirements. The position of the gate 43 corresponds precisely to the first gate position 11 on the internal component 10, ensuring accurate melt injection position, ensuring that the melt flow path meets the design expectations, and thus ensuring stable and reliable control of melt shear orientation.

[0136] The shape of the first cavity 41 can be adapted to the shape of the internal component 10. For example, the thinned portion 12 on the internal component 10 can be provided with a corresponding convex structure in the first cavity 41. Similarly, the flow-blocking groove 15, the first buffer recess 16 and the second buffer recess 17 on the internal component 10 can all be provided with corresponding convex structures in the first cavity 41.

[0137] Further, please refer to Figure 12 The apparatus for preparing the top cover also includes a supply component 50 and a distribution component 60 connected together. The distribution component 60 includes a first distribution channel 61 and a second distribution channel 62 connected together. The second distribution channel 62 is connected to the supply component 50 along a preset direction at a distance from the first distribution channel 61. The extension direction of the second distribution channel 62 intersects the preset direction, and one end of the second distribution channel 62 is connected to the gating gate 43. Therefore, the introduction of the first distribution channel 61 and the second distribution channel 62 can quickly and promptly switch temperatures, reducing the risk of high-temperature degradation and carbonization of the material. At the same time, it also avoids surface yellowing caused by high temperatures in the gating area.

[0138] It should be noted that the flow supply component 50 refers to the structure used to supply melt to the flow distribution component 60. It can store and stably output molten raw materials that meet the molding temperature requirements, ensuring the continuity of melt supply and pressure stability. The flow supply component 50 may include a main flow channel 51, a first branch flow channel 52, and a second branch flow channel 53 connected in sequence. The end of the main flow channel 51 furthest from the first branch flow channel 52 is the feed inlet. The extension direction of the main flow channel 51 may be parallel to the extension direction of the second branch flow channel 53. The first branch flow channel 52 may be perpendicular to both the main flow channel 51 and the second branch flow channel 53. Furthermore, the number of the first branch flow channel 52 and the second branch flow channel 53 can be determined according to the flow distribution component 60. For example, when there is only one flow distribution component 60, there is only one first branch flow channel 52 and one second branch flow channel 53; when there are multiple flow distribution components 60, there are multiple first branch flow channels 52 and multiple second branch flow channels 53.

[0139] The shape of the first runner 61 can be designed in various ways. For example, the cross-sectional shape of the first runner 61 can be, but is not limited to, trapezoidal, triangular, elliptical, or circular. In some specific examples, the cross-sectional shape of the first runner 61 can be trapezoidal. At the same time, the dimensions of the first runner 61, the second runner 62, and the flow supply assembly 50 can be determined according to the actual injection molding process, and are not specifically limited here.

[0140] In addition, the diversion component 60 may also include a receiving nozzle 63, which is connected to the first diversion channel 61 and is connected to the supply component 50.

[0141] In some embodiments, please refer to Figure 12The number of flow divider components 60 includes at least two. The injection mold 40 also has an auxiliary gate, which is connected to the first cavity 41 and is used to correspond to the second injection position 18 on the internal component 10. The two flow divider components 60 are respectively connected to the injection gate 43 and the auxiliary gate. It can be seen that by supplying melt to the first injection position 11 and the second injection position 18 through different flow divider components 60, the injection timing and injection pressure of different injection positions can be precisely controlled to meet the molding requirements of step injection. This ensures that the large-size cover body 20 is fully filled, and the molding quality of the weld area can be further improved by the pressure supplementation at the second injection position 18, effectively eliminating weld line defects and ensuring the overall uniformity of the cover appearance.

[0142] It should be noted that the timing of pouring molten material into the auxiliary gate is later than that of pouring molten material into the gate 43. Usually, the molten material is poured into the auxiliary gate only when the molten material entering through the gate 43 has almost filled the main body 20.

[0143] In some embodiments, this application provides a cooking device including the noodle cover described in any of the above.

[0144] The cooking device described above uses a lid with two thinning portions 12 distributed along the first direction X in the structural design of the internal component 10. These thinning portions 12 enclose a first region 13 and a second region 14 near the lid body 20. Simultaneously, a first injection point 11 is located within the first region 13, with two thinning portions 12 surrounding one side of the first injection point 11. Thus, during the injection molding of the lid body 20, after the melt is injected from the first injection point 11, the required flow rate is relatively reduced when molding the thinning portions 12 of the internal component 10. Therefore, the flow of the melt towards the thinning portions 12 is obstructed, allowing more melt to be guided from the locations of the first region 13 and the second region 14 into the location of the lid body 20 to fill and mold the lid body 20. Furthermore, since the second region 14 is positioned relative to the first region 13, either away from or towards the cavity 22, the path between the second region 14 and the first region 13 is not a direct flow path. In this way, during injection molding, the melt can be decomposed into multiple flow paths with gradually changing directions, reducing the probability of high-speed impact in one direction. This changes the single orientation of metal particles under the traditional direct flow condition, allowing the metal particles to form a gradual orientation, effectively reducing the probability of appearance defects such as orientation flow lines, light and dark bands, poor gloss, and weld lines on the cover, improving the appearance quality of the cover, and thus increasing the product qualification rate.

[0145] It should be noted that the cooking device may also include a base 70, an outer shell 71, an inner cover, and a glass panel 73. The outer shell 71 is mounted on the base 70, and the inner cover is connected to the main body 20 of the top cover and is mounted on the outer shell 71. The glass panel 73 is located on the side of the internal component 10 facing away from the cavity 22. Of course, the cooking device may also include buttons 74, heating elements, a controller, and an inner pot, etc.

[0146] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A face cover, characterized in that, The face cover includes: Internal components (10); The main body (20) of the cover is arranged around the outer periphery of the internal component (10) and connected to the internal component (10) to enclose and form a cavity (22); The internal component (10) includes a first casting position (11) and two thinning portions (12) distributed and connected on both sides of the first casting position (11) along a first direction (X). The ends of the two thinning portions (12) along a second direction (Y) are located at or near the cover body (20), and form a first region (13) and a second region (14) distributed along the second direction (Y) between them and the cover body (20). The second region (14) is closer to the cover body (20) than the first region (13), and the second region (14) is bent relative to the first region (13) along a side away from or towards the cavity (22). The first casting position (11) is at least partially located in the first region (13). The first direction (X) is the width direction of the cover, and the second direction (Y) is the length direction of the cover.

2. The face cover according to claim 1, characterized in that, The distance between the two thinned portions (12) along the first direction (X) gradually increases in the direction from the first region (13) to the second region (14).

3. The face cover according to claim 1, characterized in that, The thickness of the internal component (10) in the second region (14) gradually decreases from one end of the second region (14) near the first region (13) to one end of the second region (14) near the cover body (20).

4. The face cover according to claim 1, characterized in that, The thickness of the internal component (10) on one end of the second region (14) near the face cover body (20) is less than the thickness of the face cover body (20).

5. The face cover according to claim 4, characterized in that, The thickness of the internal component (10) on one end of the second region (14) near the face cover body (20) is denoted as T1, and the thickness of the face cover body (20) is denoted as T0, wherein 0.3≤T1 / T0≤0.

6.

6. The face cover according to claim 1, characterized in that, The plane located at the center of the cover along the first direction (X) and perpendicular to the first direction (X) is the center plane (30). The center plane (30) intersects with the outer surface of the cover body (20) and the surface of the second region (14) facing the cavity (22) to form a first contour line (21) and a second contour line (141). The tangent of the first contour line (21) near the end of the internal component (10) and the height direction (Z) of the cover are denoted as θ1. The bending angle between the tangent of the second contour line (141) near the end of the cover body (20) and the height direction (Z) of the cover is denoted as θ2. Specifically, when θ1 ≤ 10°, θ2 ≥ 45°; when θ1 ≥ 45°, θ2 ≤ 20°.

7. The faceplate according to any one of claims 1-6, characterized in that, The internal component (10) is provided with a flow-blocking groove (15), which is located on the side of the thinned portion (12) along the second direction (Y) and away from the first region (13), and the flow-blocking groove (15) extends along the first direction (X).

8. The face cover according to claim 7, characterized in that, The number of flow-blocking grooves (15) includes at least two, and each of the flow-blocking grooves (15) is distributed at intervals along the second direction (Y).

9. The face cover according to claim 8, characterized in that, The depth of the flow-blocking groove (15) is denoted as D, the thickness of the main body of the cover (20) is denoted as T0, the dimension of the flow-blocking groove (15) along the second direction (Y) is denoted as W, and the center distance between adjacent two in the first pouring position (11) and each of the flow-blocking grooves (15) is denoted as L. Wherein, 3≤W / T0≤8; and / or, 0.3≤D / T0≤0.8; and / or, 4≤L / W≤10.

10. The faceplate according to claim 8, characterized in that, The number of flow-blocking grooves (15) is three, namely the first flow-blocking groove (151), the second flow-blocking groove (152) and the third flow-blocking groove (153). The distance between the center of the first flow-blocking groove (151) and the center of the first pouring position (11) is denoted as L1, the distance between the center of the second flow-blocking groove (152) and the center of the first flow-blocking groove (151) is denoted as L2, and the distance between the center of the third flow-blocking groove (153) and the center of the second flow-blocking groove (152) is denoted as L3. When the maximum capacity of the cooking equipment is 3L, 20mm≤L1≤30mm, 50mm≤L2≤60mm, 90mm≤L3≤110mm; When the maximum capacity of the cooking equipment is 4L, 40mm≤L1≤50mm, 60mm≤L2≤70mm, and 60mm≤L3≤80mm.

11. The face cover according to claim 7, characterized in that, The internal component (10) is also provided with a first buffer recess (16), which is located on the side of the flow blocking groove (15) along the second direction (Y) and away from the thinning part (12). The extension direction of the first buffer recess (16) is set at an acute angle to the extension direction of the flow blocking groove (15).

12. The face cover according to claim 7, characterized in that, The internal component (10) further includes a second pouring position (18), and at least one of the flow-blocking grooves (15) are distributed between the second pouring position (18) and the thinning portion (12) along the second direction (Y).

13. The faceplate according to claim 7, characterized in that, The internal component (10) is also provided with a second buffer recess (17), which is located on the side of the flow blocking groove (15) along the second direction (Y) and away from the thinning part (12). The extension direction of the second buffer recess (17) is perpendicular to the extension direction of the flow blocking groove (15).

14. The faceplate according to any one of claims 1-6, characterized in that, The material of the face cover body (20) includes metal additives, and the metal additives account for 1% to 3% of the weight of the material of the face cover body (20).

15. A cooking device, characterized in that, Includes the faceplate as described in any one of claims 1-14.

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