Surface cover, pot cover assembly and cooking utensil

Abstract

The utility model discloses a face cover, a pot cover assembly and a cooking utensil, the cooking utensil comprises a pot body and the pot cover assembly covering the pot body, the pot cover assembly comprises the face cover, and the face cover comprises a top wall and a side wall surrounding the periphery of the top wall and extending towards one side of the top wall. The side wall comprises a first extension section connected with the top wall and a second extension section connected with the first extension section; in the vertical direction of the surface cover, the thickness of the first extension section is gradually increased from top to bottom, the thickness of the second extension section is gradually reduced from top to bottom, and the problems that flow marks are formed on the appearance surface of the surface cover and shimmering powder is accumulated when the surface cover of the cooking utensil is subjected to injection molding can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical field, especially face cover, pot cover subassembly and cooking utensil. BACKGROUND

[0002] The pot cover of cooking utensil generally includes a cover and a plastic face cover which is covered outside the cover, the plastic face cover includes a side wall, and the outer side of the side wall is formed as an appearance surface, in order to meet the needs of consumers, it is required to make the appearance surface of the plastic face cover have a metallic texture, generally, metal powder needs to be added in resin material, however, the flowability of resin mixed with metal powder is significantly reduced, and after injection molding, appearance defects such as flow marks and flash powder accumulation are prone to occur. SUMMARY

[0003] The face cover, the pot cover subassembly and the cooking utensil provided by the embodiments of the present application can avoid the problem that flow marks and flash powder accumulation are formed on the appearance surface of the face cover during injection molding of the face cover of the cooking utensil.

[0004] In a first aspect, the embodiments of the present application provide a face cover applied to a cooking utensil, the cooking utensil including a pot body and a pot cover subassembly which is covered on the pot body, the pot cover subassembly including a face cover, the face cover including a top wall and a side wall which extends around the outer periphery of the top wall and extends towards one side of the top wall, the side wall including a first extension section connected to the top wall and a second extension section connected to the first extension section; in the up-down direction of the face cover, the thickness of the first extension section gradually increases from top to bottom, and the thickness of the second extension section gradually decreases from top to bottom.

[0005] In some embodiments, the thickness of one end of the first extension section connected to the top wall is not less than 1.6 mm and not greater than 2.2 mm.

[0006] In some embodiments, the thickness of one end of the second extension section away from the first extension section is not less than 2 mm and not greater than 2.8 mm.

[0007] In some embodiments, the thickness of the connection between the first extension section and the second extension section is not less than 2.6 mm and not greater than 3.3 mm.

[0008] In some embodiments, the side wall further includes a third extension section, the opposite ends of the third extension section are respectively connected to the first extension section and the second extension section, and the thickness of the third extension section is not less than 2.6 mm and not greater than 3.3 mm.

[0009] In some embodiments, in the up-down direction of the face cover, the length of the third extension section is not greater than 15 mm.

[0010] In some embodiments, the length of the second extending section in the up-down direction of the face cover is not less than 15 mm and not more than 23 mm.

[0011] In some embodiments, the length of the first extending section in the up-down direction of the face cover is greater than 5 mm.

[0012] In some embodiments, the thickness of the top wall in the up-down direction of the face cover is not less than 0.8 mm and not more than 2.5 mm.

[0013] In some embodiments, a middle portion of the top wall is provided with a flow resistance portion, the extending direction of the flow resistance portion is perpendicular to the front-rear direction of the face cover, and the thickness of the flow resistance portion is not less than 0.8 mm and not more than 1.5 mm.

[0014] In some embodiments, the inner side surface of the second extending section is provided with a buckle structure, the buckle structure includes a horizontal rib extending in the horizontal direction and a vertical rib extending in the up-down direction, the thickness of the horizontal rib in the up-down direction is not less than 0.3 mm and not more than 0.7 mm, and the thickness of the vertical rib in the horizontal direction is not less than 0.55 mm and not more than 0.75 mm.

[0015] In some embodiments, the inner wall surface of the side wall is provided with a supporting rib extending in the up-down direction, and the thickness of the supporting rib is not less than 0.55 mm and not more than 0.75 mm.

[0016] In some embodiments, the top wall includes a main body portion and an injection molding portion connected to the front end of the main body portion, the injection molding portion includes a protruding portion connected to one side of the side wall, and a connecting portion connected to the side wall and annularly arranged around the side of the protruding portion, the connecting portion isolates the protruding portion from the remaining part of the top wall.

[0017] In some embodiments, the protruding portion is provided with an injection molding opening, and the thickness of the connecting portion in the up-down direction of the face cover is less than the thickness of the protruding portion and the top wall.

[0018] In a second aspect, the present application also provides a face cover, the face cover including a top wall and a side wall extending towards the top wall and annularly arranged around the outer periphery of the top wall.

[0019] The top wall includes a main body portion and an injection molding portion connected to the front end of the main body portion, the injection molding portion includes a protruding portion connected to one side of the side wall, and a connecting portion connected to the side wall and annularly arranged around the side of the protruding portion, the connecting portion isolates the protruding portion from the remaining part of the top wall.

[0020] The protruding portion is provided with an injection port, and the thickness of the connecting portion is less than the thickness of the protruding portion and the top wall in the up-down direction of the face cover.

[0021] In some embodiments, the thickness of the connecting portion is not less than 0.3 mm and not greater than 0.6 mm in the up-down direction of the face cover.

[0022] In some embodiments, the injection portion includes a first portion, a second portion and a third portion connected in sequence, the first portion connects the side wall, and the third portion is provided with the injection port.

[0023] The thickness of the first portion, the second portion and the third portion increases in sequence in the up-down direction of the face cover.

[0024] In some embodiments, the thickness of the first portion is not less than 0.7 mm and not greater than 1.5 mm in the up-down direction of the face cover.

[0025] The distance between the centers of the injection ports of the first portion to the third portion is not greater than 8 mm in the front-back direction of the face cover.

[0026] In some embodiments, the thickness of the second portion is not less than 2 mm and not greater than 3.5 mm in the up-down direction of the face cover.

[0027] In some embodiments, the first extension section includes a first segment connected with the first portion, and the thickness of the first segment is not less than 1.6 mm and not greater than 2.1 mm.

[0028] In some embodiments, the length of the first segment is less than 0.5 mm in the up-down direction of the face cover.

[0029] In a third aspect, the embodiments of the present application further provide a pot cover assembly, which includes the face cover and the inner cover as described above, and the face cover is buckled with the inner cover through the buckle structure arranged on the second extension section and / or the support rib arranged on the first extension section.

[0030] The bottom end of the inner cover does not protrude from the bottom end of the second extension section.

[0031] In a fourth aspect, the embodiments of the present application further provide a cooking appliance, which includes a pot body and the pot cover assembly as described above, and the pot cover assembly is openably and closably mounted on the pot body and cooperates with the pot body to define a cooking cavity.

[0032] The side wall of the face cover forms the appearance surface of the cooking utensil. Since the thickness of the connecting part between the first extension section and the second extension section is greater than the thickness of the edge of the first extension section and the second extension section, the plastic melt flows to the connecting part between the first extension section and the second extension section first and then flows to the edge when filling the mold cavity, forming a "convex" flow trend. The flow of the plastic melt in the mold cavity is fountain flow, that is, the flow speed of the middle part of the plastic melt is also greater than the flow speed of the edge. During the flow of the plastic melt, the front end of the plastic melt gradually spreads outward and adheres to the edge. The thickness change of the side wall in the up-down direction can adapt to the flow of the plastic melt, thereby reducing or avoiding the occurrence of the flow competition phenomenon, and defects such as flow marks are avoided.

[0033] The plastic melt has a certain degree of heat, and the temperature of the mold is lower than that of the plastic melt. Therefore, when the plastic melt flows in the mold cavity of the mold, the inner wall surface of the mold cavity is quickly cooled and solidified. If the plastic melt produces flow competition during injection molding, the subsequent material will drag the material that has been solidified to a certain extent to flow forward, so that the orientation of the metal powder changes, thereby causing the accumulation of metal powder and flow marks. The thickness of the side wall cavity is designed to control the flow speed of the plastic melt at the edge of the mold cavity to be less than the flow speed in the middle. Due to the slowing down of the flow speed at the edge, the subsequent melt no longer strongly drags the melt that has been partially solidified in front, thereby reducing the occurrence of flow marks, making the appearance of the face cover more smooth and uniform, improving the overall aesthetic appearance, reducing the orientation change of the metal powder caused by the dragging effect, and thereby avoiding defects such as metal powder accumulation and flow marks. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to the structures shown in these drawings without creating any creative labor.

[0035] Figure 1 A structural schematic diagram of a face cover provided by an embodiment of the present application;

[0036] Figure 2 A structural schematic diagram of a face cover provided by an embodiment of the present application from another perspective;

[0037] Figure 3 A top view schematic diagram of a face cover provided by an embodiment of the present application;

[0038] Figure 4 A structural schematic diagram of a face cover provided by an embodiment of the present application; Figure 3A cross-sectional view of the middle D-D;

[0039] Figure 5 For Figure 4 An enlarged view of the middle F;

[0040] Figure 6 For Figure 1 An enlarged view of the middle A;

[0041] Figure 7 For Figure 3 A cross-sectional view of the middle E-E;

[0042] Figure 8 For Figure 7 An enlarged view of the middle G;

[0043] Figure 9 For Figure 3 A cross-sectional view of the middle C-C;

[0044] Figure 10 For Figure 1 An enlarged view of the middle B;

[0045] Figure 11 An injection molding schematic of a face cover provided by the embodiments of the present application;

[0046] Figure 12 An injection molding schematic of a side wall provided by the embodiments of the present application.

[0047] Explanation of the reference signs:

[0048] 1, face cover; 10, top wall; 110, main body part; 120, injection molding part; 120a, injection molding opening; 121, protruding part; 1211, first part; 1212, second part; 1213, third part; 122, connecting part; 130, flow blocking part; 20, side wall; 210, first extension section; 211, first section; 220, second extension section; 230, third extension section; 30, buckle structure; 310, horizontal rib; 320, vertical rib; 40, support rib.

[0049] The realization of the utility model, functional features and advantages will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the present application will be further described in detail in combination with the drawings.

[0051] The description of the lower part relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Instead, they are merely examples of some of the devices and methods consistent with the present application as detailed in the appended claims.

[0052] In the description of the present application, it is understood that the terms "first", "second" and the like are used only for descriptive purposes and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, "multiple" means two or more, unless otherwise specified. The association between the associated objects is described, which means that there can be three kinds of relationships, for example, A and / or B, which means that there are three kinds of situations, such as A alone, A and B together, and B alone. The character " / " generally represents a "or" relationship between the associated objects before and after.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0054] The present application embodiment proposes a kind of cooking utensil, cooking utensil can include one of pressure cooker, electric rice cooker and electric stew pot, the specific category of the present embodiment to cooking utensil is not limited. Cooking utensil includes pot body and pot cover assembly, pot cover assembly is open and shut and covers in pot body, and with pot body cooperation forms cooking cavity.

[0055] Pot body generally includes outer pot and inner pot (also can be called inner bag), inner pot is used to hold food, inner pot can be detachably installed in outer pot, so as to facilitate user cleaning and replacement;Outer pot can act as a thermal insulation layer to reduce heat loss, so that the food in the inner pot can be heated more quickly and evenly, and also can prevent users from directly contacting the surface of the heated inner pot, reducing the risk of scalding.

[0056] Pot cover assembly includes face cover 1 and inner cover, face cover 1 is covered outside the inner cover, and can be enclosed with the inner cover to form a mounting space, so as to install electrical module or transmission module in the mounting space. Electrical module can include circuit board, display screen, sensor and other components, transmission module can include lever, button and other components. The components of the pot cover assembly have been disclosed in the related art, and the present application does not limit this.

[0057] Please refer toFigures 1 to 5 The face cover 1 comprises a top wall 10 and a side wall 20 extending around the outer periphery of the top wall 10 and towards one side of the top wall 10, the side wall 20 comprising a first extending section 210 connected to the top wall 10 and a second extending section 220 connected to the first extending section 210; wherein the thickness of the first extending section 210 gradually increases from top to bottom in the up-down direction of the face cover 1, and the thickness of the second extending section 220 gradually decreases from top to bottom.

[0058] Specifically, the side wall 20 of the face cover 1 forms the appearance surface of the cooking appliance. Since the thickness at the connection between the first extending section 210 and the second extending section 220 is greater than the thickness at the edges of the first extending section 210 and the second extending section 220, the plastic melt will first flow to the connection between the first extending section 210 and the second extending section 220 and then flow to the edges when injection filling in the cavity, forming a "convex" flow trend (see Figure 12 ). The flow of the plastic melt in the cavity is a fountain flow, that is, the flow speed of the middle part of the plastic melt is also greater than the flow speed of the edges. During the flow of the plastic melt, the front end of the plastic melt gradually spreads outward and adheres to the edges. The thickness variation of the side wall 20 in the up-down direction can adapt to the flow of the plastic melt, thereby reducing or avoiding the occurrence of the competitive flow phenomenon, and thus avoiding defects such as flow marks.

[0059] Further, in order to improve the aesthetics of the appearance surface on the face cover 1, a metal filler material with a small particle size, such as metal powder, metal fiber, etc., can be added to the plastic melt. These metal filler materials can impart a metallic luster to the appearance surface, which will exhibit rich color changes and gradations under the irradiation of light, enhancing the visual effect. The metal powder can be a flaky structure (e.g., corn-shaped, silver dollar-shaped) ground from metal powder, with a particle size of about 6-60 um and a thickness of 0.5-5 um. The orientation direction of the metal powder directly determines the refraction angle of light on its surface, thereby affecting the optical refraction and brightness of the product surface. When the orientation direction of the metal powder is consistent with the flow direction of the plastic melt, light can more easily penetrate the metal sheet, resulting in differences in surface optical refraction brightness, which can appear as "bright bands" or "bright lines". Conversely, if the orientation direction is perpendicular to or significantly deviates from the flow direction, the reflection and refraction of light on the metal sheet will be more complex, resulting in a darker or unevenly shiny appearance on the surface, i.e., appearance flow marks on the product.

[0060] It can be understood that the plastic melt has a certain degree of heat, and the temperature of the mold is lower than that of the plastic melt, so that the inner wall of the cavity of the mold is quickly cooled and solidified when the plastic melt flows in the cavity of the mold. If the plastic melt produces flow competition during the injection molding process, the subsequent material will drag the material that has been solidified to a certain extent to flow forward, so that the orientation of the metal powder changes, thereby causing the accumulation of metal powder and flow marks.

[0061] When the plastic melt flows in the cavity with a fixed thickness of the side wall 20, the flow speed of the product edge is often faster than that of the central area. This is because the resistance of the edge part is relatively small, and the plastic melt is more likely to flow quickly along the edge of the mold. In the edge part, due to the fast flow speed of the plastic melt, the shear force also increases accordingly, and the shear heat generated is also more. These shear heats will further heat the melt, reduce the viscosity, and accelerate the flow speed, thereby forming a positive feedback mechanism, that is, the so-called "flow competition phenomenon", the subsequent melt will drag the front partially solidified melt to flow forward, thereby changing the orientation of the metal powder, causing the accumulation of metal powder and flow marks. Through the design of the thickness of the side wall 20 cavity, the flow speed of the plastic melt at the edge of the cavity is controlled to be less than the flow speed in the middle. Due to the slowing down of the edge flow speed, the subsequent melt no longer strongly drags the front partially solidified melt, thereby reducing the generation of flow marks, making the appearance of the face cover 1 more smooth and uniform, improving the overall appearance, reducing the change of the orientation of the metal powder caused by the dragging effect, thereby avoiding the defects of metal powder accumulation and flow marks.

[0062] In some embodiments, referring to Figure 5 , the thickness D1 of the first extension section 210 connected to one end of the top wall 10 is not less than 1.6 mm and not more than 2.2 mm, for example, the thickness D1 of the first extension section 210 connected to one end of the top wall 10 can be designed to be 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, etc. The thickness D2 of the second extension section 220 away from one end of the first extension section 210 is not less than 2 mm and not more than 2.8 mm, for example, the thickness D2 of the second extension section 220 away from one end of the first extension section 210 can be designed to be 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, etc. The thickness of the connection between the first extension section 210 and the second extension section 220 is not less than 2.6 mm and not more than 3.3 mm, for example, the thickness of the connection between the first extension section 210 and the second extension section 220 can be designed to be 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, 3.3 mm, etc.

[0063] It can be understood that if the thickness D1 of the first extension section 210 connecting one end of the top wall 10 is less than 1.6 mm, it is easy to cause the strength of the connection between the first extension section 210 and the top wall 10 to be low, and if it is greater than 2.2 mm, the thickness of the connection between the first extension section 210 and the second extension section 220 needs to be set to be larger. Similarly, if the thickness D2 of the end of the second extension section 220 away from the first extension section 210 is less than 2 mm, it is easy to cause the structural strength to be insufficient, and it is difficult to cooperate with the pot body cover. If it is greater than 2.8 mm, it is easy to cause the thickness of the connection between the first extension section 210 and the second extension section 220 to need to be set to be larger.

[0064] In this embodiment, please refer to Figure 11 and Figure 12 By designing the thickness relationship of the end of the first extension section 210 away from the second extension section 220 (that is, the end of the first extension section 210 connecting the top wall 10), the end of the second extension section 220 away from the first extension section 210, and the connection between the first extension section 210 and the second extension section 220, the flow speed of the plastic melt at the edge of the cavity can be controlled to be less than one half of the middle flow speed, the edge flow speed and the flow speed of the front end form a certain angle, the angle range is ɑ=25°~55°, by controlling the edge flow speed, the shear force and shear heat of the plastic melt at the edge part can be significantly reduced, thereby reducing the occurrence of the competition flow phenomenon, reducing the dragging effect of the plastic melt on the metal powder, making the orientation of the metal powder more uniform and consistent, and avoiding the generation of metal powder accumulation and flow marks.

[0065] In some embodiments, please refer to Figure 5 The side wall 20 further comprises a third extension section 230, the opposite ends of the third extension section 230 are connected to the first extension section 210 and the second extension section 220 respectively, the thickness D3 of the third extension section 230 is not less than 2.6 mm and not greater than 3.3 mm, for example, the thickness D3 of the third extension section 230 can be designed to be 2.6 mm, 2.8 mm, 3.0 mm, 3.2 mm, and 3.3 mm, etc. The third extension section 230 can make the side wall 20 have better structural strength.

[0066] The length L3 of the third extending section 230 in the up-down direction of the face cover is not greater than 15 mm. For example, the length L1 of the first extending section 210 can be designed as 5 mm, 6 mm, 7 mm, 8 mm, etc. It should be noted that the length of the side wall 20 is generally between 35 mm and 70 mm. If the length L3 of the third extending section 230 is greater than 15 mm, the length L1 of the first extending section 210 and the length L2 of the second extending section 220 are designed to be smaller, and the thicknesses of the opposite ends of the first extending section 210 and the second extending section 220 are not the same, so that the change trend of the opposite ends of the first extending section 210 and the second extending section 220 is large, which affects the stability of the plastic melt flowing in the cavity. The length L3 of the third extending section 230 is controlled to be less than 15 mm in the present application, which can effectively ensure the stability of the plastic melt flowing.

[0067] In some embodiments, referring to Figure 5 The length L2 of the second extending section 220 in the up-down direction of the face cover 1 is not less than 15 mm and not greater than 23 mm. For example, the length L2 of the second extending section 220 can be designed as 15 mm, 18 mm, 20 mm, 22 mm, 23 mm, etc. The length L1 of the first extending section 210 is greater than 5 mm. For example, the length L1 of the first extending section 210 can be designed as 5 mm, 6 mm, 7 mm, 8 mm, etc. As described above, the thicknesses of the opposite ends of the first extending section 210 and the second extending section 220 are not the same, and in this embodiment, the minimum lengths of the first extending section 210 and the second extending section 220 are limited, so that the change trend of the first extending section 210 and the second extending section 220 is not too large, which affects the stability of the plastic melt flowing. In addition, the length L2 of the second extending section 220 is also limited to be not greater than 23 mm. Since the side of the second extending section 220 away from the first extending section 210 is located at the edge position, if the length L2 of the second extending section 220 is too long, the path of the plastic melt flowing from the first extending section 210 or the third extending section 230 to the edge of the second extending section 220 is long, and the resistance is large, which is easy to produce vortex, backflow, etc. These unstable flow patterns can further increase the resistance of the melt flowing, and can cause the melt to be stagnant or accumulated at the edge of the side wall 20. This not only affects the appearance quality of the product, such as producing flow marks, shrink marks, etc., but also can affect the physical properties and mechanical properties of the product.

[0068] It should be noted that the specific length of the first extension section 210, the second extension section 220 and the third extension section 230 should be designed according to the length of the side wall 20. For example, when the length of the side wall 20 is 35 mm, the length L1 of the first extension section 210 can be designed as 5 mm, the length L2 of the second extension section 220 can be designed as 15 mm, and the length L3 of the third extension section 230 can be designed as 15 mm; or the length L1 of the first extension section 210 can be designed as 12 mm, and the length L2 of the second extension section 220 can be designed as 23 mm. When the length of the side wall 20 is 50 mm, the length L1 of the first extension section 210 can be designed as 12 mm, the length L2 of the second extension section 220 can be designed as 23 mm, and the length L3 of the third extension section 230 can be designed as 15 mm; or the length L1 of the first extension section 210 can be designed as 15 mm, the length L2 of the second extension section 220 can be designed as 20 mm, and the length L3 of the third extension section 230 can be designed as 15 mm.

[0069] In some embodiments, referring to Figure 1 , Figure 6 and Figure 9 , the top wall 10 comprises a main body part 110 and an injection molding part 120 connected to the front end of the main body part 110, the injection molding part 120 comprises a protruding part 121 connected to the side wall 20 on one side, and a connecting part 122 connected to the side wall 20 and arranged around the periphery of the protruding part 121, the connecting part 122 is isolated from the rest of the top wall 10 and connected to the protruding part 121; wherein the protruding part 121 is provided with an injection port 120a, in the up-down direction of the face cover 1, the thickness D4 of the connecting part 122 is less than the thickness D5 of the protruding part 121 and the thickness D6 of the top wall 10. In this application, by arranging the connecting part 122 around the periphery of the protruding part 121, isolating the protruding part 121 from the rest of the top wall 10, and making the thickness D4 of the connecting part 122 less than the thickness D5 of the protruding part 121 and the thickness D6 of the top wall 10, the flow rate of the plastic melt in the cavity for forming the top wall 10 can be reduced, and the plastic melt entering the injection port 120a is guided to flow to the cavity for forming the side wall 20 after entering the protruding part 121, so that most of the plastic melt flows to the cavity for forming the side wall 20 first, and then converges in the cavity for forming the top wall 10. Since the upper part of the top wall 10 can be installed with a decorative part or other cover, and does not form an appearance surface, the flow marks or flash powder accumulation generated when the convergence is completed will not be exposed, improving the appearance of the face cover 1.

[0070] In some embodiments, in the up-down direction of the face cover 1, the thickness D4 of the connecting portion 122 is not less than 0.3 mm and not greater than 0.6 mm, for example, the thickness D4 of the connecting portion 122 can be designed to be 0.3 mm, 0.4 mm, 0.5 mm and 0.6 mm. It can be understood that if the thickness D4 of the connecting portion 122 is designed to be less than 0.3 mm, the structural strength is not enough, and cracking, breaking and the like are prone to occur, and if the thickness D4 of the connecting portion 122 is designed to be greater than 0.6 mm, the thickness D5 of the protruding portion 121 and the thickness D6 of the top wall 10 will be affected.

[0071] In some embodiments, referring to Figures 6 to 8 , the injection portion 120 includes a first portion 1211, a second portion 1212 and a third portion 1213 connected in sequence, the first portion 1211 is connected to the side wall 20, and the third portion 1213 is provided with an injection port 120a; in the up-down direction of the face cover 1, the thicknesses of the first portion 1211, the second portion 1212 and the third portion 1213 are sequentially increased. That is, the plastic melt enters the third portion 1213, the second portion 1212, the first portion 1211 and then the side wall 20 in sequence from the injection port 120a. In this process, the third portion 1213 can have the function of storing energy, which can store the energy of the melt to some extent, help the melt flow more smoothly into the subsequent part, and reduce the injection defects caused by poor flow. Further, the plastic melt will experience thermal expansion and cold contraction during the injection cooling process, resulting in shrinkage of the product. This shrinkage is particularly evident in areas with greater thickness, because thicker areas release more heat during the cooling process, thereby generating greater shrinkage stress. At the bend of the plastic part, it is often designed to be thicker, which further increases the risk of shrink marks in this area during the cooling process. The first portion 1211 at the position connected to the side wall 20 is designed to be smaller in thickness in the present application, which can reduce the shrinkage stress of this area during the cooling process, thereby reducing the generation of shrink marks.

[0072] In the up-down direction of the face cover 1, the thickness D51 of the first portion 1211 is not less than 0.7 mm and not greater than 1.5 mm. It can be understood that the thickness D51 of the first portion 1211 is greater than the thickness of the connecting portion 122, so that the plastic melt can be blocked by the connecting portion 122 and easily enter the side wall 20 through the first portion 1211, and in order to effectively ensure the structural strength of the connecting portion 122, the thickness D51 of the first portion 1211 needs to be designed to be equal to or greater than 0.7 mm, while the thickness D52 of the second portion 1212 and the thickness D53 of the third portion 1213 need to be ensured, so that the thickness D51 of the first portion 1211 needs to be designed to be less than or equal to 1.5 mm.

[0073] Further, in the up-down direction of the face cover 1, the thickness D52 of the second part 1212 is not less than 2 mm and not more than 3.5 mm. The thickness D53 of the third part 1213 only needs to be greater than the thickness D52 of the second part 1212, for example, 3.8 mm, 4 mm, 4.2 mm, and the like.

[0074] In some embodiments, referring to Figure 8 In the front-rear direction of the face cover 1, the distance L4 of the centers of the injection ports 120a of the first part 1211 to the third part 1213 is not more than 8 mm. If the distance L4 of the centers of the injection ports 120a of the first part 1211 to the third part 1213 is designed to be greater than 8 mm, the travel of the plastic melt from the third part 1213 to the first part 1211 is longer, which is not conducive to the flow of the plastic melt to the side wall 20.

[0075] It should be noted that the front-rear direction of the face cover 1 can be understood as the front-rear direction of the cooking utensil. In the process of using the cooking utensil, the end close to the user / the end where the operating device is arranged is the front end, and the end away from the user / the end where the pot cover is hinged to the pot body is the rear end. It can be understood that in the cooking process, the user usually needs to conveniently operate and control the cooking utensil, such as adjusting the fire, setting the cooking time, and the like. These operating devices, such as knobs, buttons, or touch screens, are usually arranged at positions easily reached by the user. Considering the comfort and convenience of the user in use, these operating devices are often placed at the end close to the user, i.e., the “front end”. The operating area away from the user is the “rear end”.

[0076] The thicknesses of the first part 1211, the second part 1212, and the third part 1213 not only need to consider the relationship with the connecting part 122, but also need to consider that the change trend cannot be too large. When the change of the thicknesses between the first part 1211, the second part 1212, and the third part 1213 is too large, stress concentration will occur at the position of the thickness mutation in the cooling and solidification process of the face cover 1, thereby causing problems such as cracking, deformation, or breaking in the use process, affecting the service life and reliability of the product. Moreover, the plastic melt will flow along the cavity of the mold in the injection molding process. If the change of the thicknesses is too large, the melt may encounter a large flow resistance when flowing through these areas, causing the melt to flow poorly or to generate vortexes, backflow, and the like, which may cause appearance defects such as flow marks, bubbles, and the like. Therefore, the thickness range values of the first part 1211, the second part 1212, and the third part 1213, and the distance L4 range values of the centers of the injection ports 120a of the first part 1211 to the third part 1213 provided in the present application can not only facilitate the flow of the plastic melt, but also are not prone to forming appearance defects.

[0077] In some embodiments, the first extending section 210 comprises a first section 211 connected with the first part 1211, and the thickness D11 of the first section 211 is not less than 1.6 mm and not more than 2.1 mm. In the up-down direction of the face cover 1, the length L11 of the first section 211 is less than 0.5 mm. As mentioned above, the thickness D51 of the first part 1211 is not more than 1.5 mm, and if the thickness D11 of the first section 211 connected with the first part 1211 is designed to be larger, the change trend of the plastic melt from the first part 1211 to the first section 211 will be too large, and the stability of the plastic melt flow will be reduced. The present application limits the range value of the thickness D11 of the first section 211, which can facilitate the stable flow of the plastic melt and reduce the generation of appearance defects. The length L11 of the first section 211 is less than 0.5 mm, and it can be understood that the thickness D1 of the first extending section 210 gradually increases. The thickness D11 of the first section 211 can be set to a fixed value, and after the first section 211 controls the stable flow of the plastic melt, the thickness of the remaining part of the first extending section 210 gradually increases to guide the stable flow of the plastic melt.

[0078] In some embodiments, in the up-down direction of the face cover 1, the thickness D6 of the top wall 10 is not less than 0.8 mm and not more than 2.5 mm, for example, the thickness D6 of the top wall 10 can be designed to be 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, and 2.5 mm, etc. If the thickness D6 of the top wall 10 is less than 0.8 mm, it is easy to cause insufficient structural strength, and if the thickness D6 of the top wall 10 is greater than 2.5 mm, it increases the cost and the weight. While the thickness range value of the top wall 10 provided in the present application can effectively guarantee the structural strength while reducing the cost.

[0079] In some embodiments, the middle part of the top wall 10 is provided with a flow resistance part 130, the extending direction of the flow resistance part 130 is perpendicular to the front-rear direction of the face cover 1, and in the up-down direction of the face cover 1, the thickness of the flow resistance part 130 is not less than 0.8 mm and not more than 1.5 mm, for example, the thickness of the flow resistance part 130 can be designed to be 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, and 1.5 mm, etc. The flow resistance part 130 can further reduce the flow speed of the plastic melt in the cavity for forming the top wall 10, and further ensure that the plastic melt finally converges on the top wall 10.

[0080] In some embodiments, the inner side surface of the second extending section 220 is provided with a buckling structure 30. The buckling structure 30 is arranged on the second extending section 220, which can facilitate the snap connection of the face cover and the inner cover through the buckling structure 30. The buckling structure 30 includes a horizontal rib 310 extending in the horizontal direction and a vertical rib 320 extending in the vertical direction. The thickness of the horizontal rib 310 in the vertical direction is not less than 0.3 mm and not more than 0.7 mm, and the thickness of the vertical rib 320 in the horizontal direction is not less than 0.55 mm and not more than 0.75 mm. For example, the thickness of the horizontal rib 310 can be designed as 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.75 mm, etc.; and the thickness of the vertical rib 320 can be designed as 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, etc.

[0081] In some embodiments, the inner wall surface of the second extending section 220 is provided with a support rib 40 extending in the vertical direction. The thickness of the support rib 40 is not less than 0.55 mm and not more than 0.75 mm, for example, the thickness of the vertical rib 320 can be designed as 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, etc. The buckling structure 30 is used to be snap-fixed with the inner cover. Since the thickness of the second extending section 220 gradually decreases from top to bottom, the support rib 40 can increase the structural strength of the second extending section 220. The face cover 1 of the present application is snap-connected with the inner cover through the buckling structure 40 arranged on the second extending section 220 and / or the support rib 40 arranged on the first extending section 210, which can improve the stability of the connection between the face cover 1 and the inner cover. In addition, the bottom end of the inner cover does not protrude from the bottom end of the second extending section 220, so that the face cover 1 can protect the inner cover. Therefore, the number of the buckling structure 30 and the support rib 40 can be designed according to the requirements, for example, 1, 2, 3, 5, 8, etc. The number of the buckling structure 30 and the support rib 40 is not limited in the present application.

[0082] It should be noted that, please refer to Figure 11In the present application, the injection port 120a is arranged on the top wall 10, the plastic melt flows from the top wall 10 to the side wall 20, and the side wall 20 flows transversely. When the plastic melt flows on the side wall 20, the length direction of the transverse rib 310 extending in the horizontal direction is consistent with the flow direction of the plastic melt. If the thickness of the transverse rib 310 is greater than 0.7 mm, the plastic melt will have a large flow rate change when flowing, and micro-turbulence will occur, which will change the orientation of the metal powder. If the thickness of the transverse rib 310 is less than 0.3 mm, the structural strength is low and is easy to be damaged during buckling. The length direction of the vertical rib 320 and the support rib 40 extending in the up-down direction is perpendicular to the flow direction of the plastic melt, and the plastic melt can quickly flow through this type of rib, and turbulence does not occur. Therefore, compared with the transverse rib 310, the thickness can be designed to be a little larger, and the structural strength is higher. If the thickness of the vertical rib 320 and the support rib extending in the up-down direction is greater than 0.75 mm, the plastic melt is easy to flow too much to this type of rib, and turbulence occurs.

[0083] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0084] The above is only a preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A face cover applied to a cooking appliance, the cooking appliance comprising a pot body and a pot cover assembly which is fitted on the pot body, the pot cover assembly comprising a face cover, characterized in that, The face cover comprises a top wall and a side wall extending around the periphery of the top wall and towards one side of the top wall, the side wall comprising a first extension section connected to the top wall and a second extension section connected to the first extension section; In the up-down direction of the face cover, the thickness of the first extension section gradually increases from top to bottom, and the thickness of the second extension section gradually decreases from top to bottom.

2. The face cover of claim 1, wherein, The thickness of one end of the first extension section connected to the top wall is not less than 1.6 mm and not greater than 2.2 mm; And / or, the thickness of one end of the second extension section away from the first extension section is not less than 2 mm and not greater than 2.8 mm; And / or, the thickness of the connection between the first extension section and the second extension section is not less than 2.6 mm and not greater than 3.3 mm; And / or, in the up-down direction of the face cover, the length of the second extension section is not less than 15 mm and not greater than 23 mm; And / or, in the up-down direction of the face cover, the length of the first extension section is greater than 5 mm; And / or, in the up-down direction of the face cover, the thickness of the top wall is not less than 0.8 mm and not greater than 2.5 mm; And / or, a middle part of the top wall is provided with a flow resistance part, the extension direction of the flow resistance part is perpendicular to the front-back direction of the face cover, and the thickness is not less than 0.8 mm and not greater than 1.5 mm.

3. The face cover of claim 1, wherein, The side wall further comprises a third extension section, the opposite ends of the third extension section are respectively connected to the first extension section and the second extension section, and the thickness of the third extension section is not less than 2.6 mm and not greater than 3.3 mm; And / or, in the up-down direction of the face cover, the length of the third extension section is not greater than 15 mm.

4. A face cover according to any one of claims 1 to 3, wherein The inner side surface of the second extension section is provided with a buckle structure, the buckle structure comprises a horizontal rib extending in the horizontal direction and a vertical rib extending in the up-down direction, the thickness of the horizontal rib in the up-down direction is not less than 0.3 mm and not greater than 0.7 mm, and the thickness of the vertical rib in the horizontal direction is not less than 0.55 mm and not greater than 0.75 mm; And / or, the inner wall surface of the second extension section is provided with a support rib extending in the up-down direction, and the thickness of the support rib in the horizontal direction is not less than 0.55 mm and not greater than 0.75 mm.

5. The face cover of any one of claims 1 to 3, wherein, The top wall comprises a main body part and an injection molding part connected to the front end of the main body part, the injection molding part comprises a protruding part connected to one side of the side wall, and a connecting part connected to the side wall and arranged around the periphery of the protruding part, the connecting part isolates the connection between the protruding part and the remaining part of the top wall; Wherein, the protruding part is provided with an injection molding opening, and the thickness of the connecting part is less than the thickness of the protruding part and the top wall in the up-down direction of the face cover.

6. A face cover for use in a cooking appliance, the cooking appliance comprising a pot body and a pot cover assembly that fits over the pot body, the pot cover assembly comprising a face cover, characterized in that, The face cover comprises a top wall and a side wall extending around the periphery of the top wall and towards one side of the top wall; The top wall comprises a main body part and an injection molding part connected to the front end of the main body part, the injection molding part comprises a protruding part connected to one side of the side wall, and a connecting part connected to the side wall and arranged around the periphery of the protruding part, the connecting part isolates the connection between the protruding part and the remaining part of the top wall; The protruding part is provided with an injection port, and the thickness of the connecting part is less than the thickness of the protruding part and the top wall in the up-down direction of the face cover.

7. The face cover of claim 6, wherein, The thickness of the connecting part is not less than 0.3 mm and not more than 0.6 mm in the up-down direction of the face cover. The injection part comprises a first part, a second part and a third part connected in sequence, the first part is connected with the side wall, the third part is provided with the injection port, and the side wall comprises a first extension segment connected with the top wall. The thickness of the first part, the second part and the third part increases in sequence in the up-down direction of the face cover.

8. The face cover of claim 7, wherein, The thickness of the first part is not less than 0.7 mm and not more than 1.5 mm in the up-down direction of the face cover. The distance between the centers of the injection ports of the first part to the third part is not more than 8 mm in the front-back direction of the face cover. The thickness of the second part is not less than 2 mm and not more than 3.5 mm in the up-down direction of the face cover. The first extension segment comprises a first segment connected with the first part, and the thickness of the first segment is not less than 1.6 mm and not more than 2.1 mm. The length of the first segment is less than 0.5 mm in the up-down direction of the face cover.

9. A lid assembly, characterized by The face cover and the inner cover as claimed in any one of claims 1 to 8 are connected through the buckle structure provided on the second extension segment and / or the supporting rib provided on the first extension segment. The bottom end of the inner cover does not protrude from the bottom end of the second extension segment.

10. A cooking appliance characterized by, The pot cover assembly as claimed in claim 9 is installed on the pot body in an openable and closable manner, and cooperates with the pot body to define a cooking cavity.

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