Electricity-proof wall cover and injection molding method thereof

Abstract

The invention relates to the technical field of household appliances, and discloses an electricity-proof wall cover and an injection molding method thereof. The anti-electricity wall cover comprises a front side plate, a bottom side plate and a connecting plate, the front side plate is provided with an installation opening used for installing a control panel, the installation opening is provided with two first inner walls which are oppositely arranged and extend in the first direction, and each first inner wall is provided with an injection molding mark structure; the injection molding mark structure is a connecting structure between the cut auxiliary supporting column and the first inner wall; the bottom side plate and the front side plate are arranged at an included angle and are connected; the two connecting plates are located on the two sides of the front side plate respectively, and each connecting plate is connected with the front side plate and the bottom side plate. According to the anti-electricity wall cover, on one hand, it can be guaranteed that the anti-electricity wall cover is not shrunk in the length direction in the injection molding process, the situation that the anti-electricity wall cover is deformed at an installation opening is avoided, and then stable assembly of the anti-electricity wall cover and a control panel is guaranteed; on the other hand, the radian and the roundness of the connecting plate of the electricity-proof wall cover can be guaranteed, and then the assembling quality between the electricity-proof wall cover and the shell is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a protection wall cover and a method for injection molding the same. BACKGROUND

[0002] As a common household appliance in daily life, a water heater can heat cold water to hot water of suitable temperature for users. The water heater comprises a shell and a protection wall cover assembly arranged on the shell. The protection wall cover assembly has two main functions: 1) hiding the inlet and outlet insulation pipes, playing a decorative role and ensuring the aesthetic appearance of the water heater; and 2) fixing a display panel and a control panel, wherein the control panel can control the water heater.

[0003] The protection wall cover in the related art generally comprises a front side plate, a bottom side plate and connecting plates. The front side plate is arranged at an angle with the bottom side plate and connected to the bottom side plate. Two connecting plates are respectively arranged on both sides of the front side plate, and each connecting plate is connected to a side edge of the front side plate and a side edge of the bottom side plate. An installation opening for mounting the control panel and the display panel is arranged on the front side plate. However, the following problems usually exist in the injection molding process of the protection wall cover: 1) In order to adapt to the shape of the control panel, the installation opening is usually in a strip shape. If the pressure is not well controlled during injection molding, the protection wall cover is prone to shrinkage in the length direction, and deformation is prone to occur at the installation opening, thereby affecting the appearance quality of the finished protection wall cover and affecting the assembly of the protection wall cover and the control panel. 2) In order to adapt to the shape of the shell of the water heater, the free edges of the connecting plates are usually arc-shaped. If the pressure is not well controlled during injection molding, the curvature and roundness of the free edges of the connecting plates are affected, thereby affecting the assembly of the protection wall cover and the shell and causing a gap between the protection wall cover and the shell of the assembled water heater, which affects the appearance quality and reduces the user experience.

[0004] Therefore, there is an urgent need to provide a protection wall cover and a method for injection molding the same to solve the above problems. SUMMARY

[0005] The present application aims to provide a protection wall cover and a method for injection molding the same. On the one hand, the protection wall cover can avoid shrinkage in the length direction and deformation at the installation opening during injection molding, thereby ensuring stable assembly of the protection wall cover and the control panel. On the other hand, the curvature and roundness of the connecting plates of the protection wall cover can be ensured, thereby ensuring the assembly quality between the protection wall cover and the shell.

[0006] In order to achieve the above-mentioned target, the present application adopts the following technical solution:

[0007] A protection wall cover for a water heater, comprising:

[0008] The front side plate is provided with a mounting opening for mounting a control panel, the mounting opening has two first inner walls oppositely arranged and extending along a first direction, each of the first inner walls is formed with an injection mark structure which is a connecting structure between a sheared auxiliary support column and the first inner wall;

[0009] The bottom side plate is arranged at an angle with the front side plate and is connected with the front side plate;

[0010] The connecting plates are arranged on both sides of the front side plate, and each of the connecting plates is connected with the front side plate and the bottom side plate.

[0011] As a preferred scheme of the anti-electric wall cover provided by the application, at least two injection mark structures are arranged on each of the first inner walls, and the at least two injection mark structures are arranged at intervals along the extension direction of the corresponding first inner wall.

[0012] As a preferred scheme of the anti-electric wall cover provided by the application, the injection mark structures on the two first inner walls are arranged one by one in correspondence, and the connecting line direction of the corresponding injection mark structures is perpendicular to the first direction.

[0013] As a preferred scheme of the anti-electric wall cover provided by the application, the mounting opening further has two second inner walls oppositely arranged and extending along a second direction, the length of the first inner wall is greater than the length of the second inner wall; wherein the second direction is perpendicular to the first direction.

[0014] As a preferred scheme of the anti-electric wall cover provided by the application, a reinforcing rib is arranged between each of the connecting plates and the bottom side plate.

[0015] As a preferred scheme of the anti-electric wall cover provided by the application, a plurality of reinforcing ribs arranged at intervals along a third direction are arranged between each of the connecting plates and the corresponding side of the bottom side plate; wherein the first direction is perpendicular to the third direction.

[0016] And / or, the reinforcing rib is an L-shaped structure, a trapezoidal structure or a triangular structure.

[0017] As a preferred scheme of the anti-electric wall cover provided by the application, a clamping piece is arranged on the front side plate, a clamping hole corresponding to the clamping piece is arranged on the shell of the water heater, and the clamping piece is clamped and matched in the clamping hole;

[0018] And / or, a connecting column is arranged on the bottom side plate, and a fastener can be threadedly connected to the shell of the water heater after passing through the connecting column;

[0019] And / or, the bottom side plate is provided with an opening, opposite sides of the opening are respectively provided with a first limiting structure and a second limiting structure, a push piece is installed on the bottom side plate and is slidably arranged between the first limiting structure and the second limiting structure.

[0020] The application further provides an injection molding method of an anti-electric wall cover for manufacturing the anti-electric wall cover.

[0021] Step S1: providing an injection mold of an anti-electric wall cover, the injection mold of the anti-electric wall cover is used for injection molding of the anti-electric wall cover, the injection mold of the anti-electric wall cover has an injection cavity, a main runner structure and an auxiliary runner structure, an outlet of the main runner structure is connected with the injection cavity, the injection cavity has a first forming surface, the first forming surface is used for forming a first inner wall of a mounting port on the front side plate, two ends of the auxiliary runner structure are respectively connected with the first forming surface;

[0022] Step S2: setting injection process parameters;

[0023] Step S3: opening the main runner structure, forming a front side plate, a bottom side plate and a connecting plate in the injection cavity, and forming an auxiliary support column in the auxiliary runner structure;

[0024] Step S4: cutting off the auxiliary support column, and forming an injection mark structure on the first inner wall.

[0025] As a preferred scheme of the injection molding method of the anti-electric wall cover, the number of the auxiliary runner structure is at least two, and the at least two auxiliary runner structures are arranged along a first direction.

[0026] As a preferred scheme of the injection molding method of the anti-electric wall cover, the main runner structure has a plurality of valve gates, in the step S3, corresponding valve gates are opened in a set order to perform multi-point sequential valve gate injection.

[0027] The application has the following beneficial effects:

[0028] The anti-electric wall cover provided by the present application forms an injection mark structure on the first inner wall of the mounting port, and the injection mark structure is a connecting structure between the auxiliary support column which is cut off and the first inner wall. When forming, the auxiliary support column can provide the anti-electric wall cover with an injection pressure maintaining function in the injection molding process. On the one hand, the anti-electric wall cover can avoid shrinkage in the length direction during injection molding, and prevent deformation at the mounting port. On the other hand, the auxiliary support column can play a restraining role on the connecting plate, so as to ensure the curvature and roundness of the connecting plate, and further ensure the injection molding effect and appearance quality of the anti-electric wall cover. The injection mark structure formed on the anti-electric wall cover after forming can provide positioning for the assembly between the anti-electric wall cover and the control panel assembly, and further ensure that the anti-electric wall cover and the control panel assembly can be accurately assembled. In addition, since the anti-electric wall cover has good injection molding effect and appearance quality, the assembly effect between the anti-electric wall cover and the control panel assembly and the assembly effect between the anti-electric wall cover and the shell can be ensured, and flash between the anti-electric wall cover and the shell can be avoided, so as to affect the user experience.

[0029] The injection molding method of the anti-electric wall cover provided by the present application is used for forming the anti-electric wall cover. On the one hand, the anti-electric wall cover can avoid shrinkage in the length direction during injection molding and deformation at the mounting port, and further ensure the stable assembly of the anti-electric wall cover and the control panel. On the other hand, the curvature and roundness of the connecting plate of the anti-electric wall cover can be ensured, and further the assembly quality between the anti-electric wall cover and the shell can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.

[0031] Figure 1 is a structural schematic diagram of a water heater provided by the first embodiment of the present application;

[0032] Figure 2 is a partial explosion schematic diagram of the water heater provided by the first embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of an anti-electric wall cover assembly and a control panel assembly provided by the first embodiment of the present application;

[0034] Figure 4 is Figure 3 is a local enlarged view at A;

[0035] Figure 5 is a structural schematic diagram of an anti-electric wall cover provided by the first embodiment of the present application;

[0036] Figure 6 is Figure 5 a partial structural schematic diagram of the anti-electricity wall cover;

[0037] Figure 7 is a schematic diagram of an anti-electricity wall cover and a flow channel structure provided by an embodiment two of the present application;

[0038] Figure 8 is a flow chart of an injection molding method of the anti-electricity wall cover provided by an embodiment two of the present application.

[0039] Reference signs:

[0040] 100, anti-electricity wall cover assembly;

[0041] 10, anti-electricity wall cover; 11, front side plate; 110, mounting opening; 111, first inner wall; 112, second inner wall; 113, clamping piece; 1131, clamping connecting part; 1132, hooking part; 12, bottom side plate; 120, opening; 121, first limiting structure; 122, second limiting structure; 123, guide piece; 1231, guide connecting part; 1232, guide part; 124, connecting column; 13, connecting plate; 130, reinforcing rib;

[0042] 20, push piece; 21, through hole;

[0043] 200, shell; 201, clamping hole;

[0044] 300, control panel assembly;

[0045] 1000, anti-electricity wall cover injection mold; 1010, main flow channel structure; 1011, first injection flow channel; 1012, second injection flow channel; 1013, total flow channel; 1020, auxiliary flow channel structure. DETAILED DESCRIPTION

[0046] Before any embodiments of this application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0047] In this application, the terms "comprise", "comprising", "having", "including", "contain", "containing", "include" or any other variant thereof are intended to cover non-exclusive inclusions, such that processes, methods, articles, or apparatuses that "comprise", "comprising", "having", "including", "contain", "containing", "include" a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles, or apparatuses. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0048] In the present application, the term "and / or" is used to describe the relationship between the associated objects, which means that there can be three relationships. For example, A and / or B can mean that there are three cases: A exists alone, A and B exist together, and B exists alone. In addition, in the present application, the character " / " generally indicates that the associated objects before and after are in a "and / or" relationship.

[0049] In the present application, the terms "connected", "combined", "coupled", and "mounted" can be direct connection, combination, coupling, or mounting, or indirect connection, combination, coupling, or mounting. Among them, for example, direct connection means that two parts or components are connected together without setting an intermediate part, and indirect connection means that two parts or components are connected with at least one intermediate part, and the two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0050] In the present application, those of ordinary skill in the art will understand that the relative terms used in connection with the quantity or condition (for example, "about", "approximately", "substantially" and the like) include the value indicated by the context and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative term can refer to a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value. The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to a certain number of degrees (for example, 1 degree, 5 degrees, 10 degrees or more) added or subtracted from the indicated angle.

[0051] In the present application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0052] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it is also understood in the context that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below, etc.

[0053] Embodiment one

[0054] Figure 1 A structural schematic diagram of the water heater provided by the present embodiment is shown. Figure 2 A partial exploded schematic diagram of the water heater provided by the present embodiment is shown. As Figures 1-2 shown, the present embodiment provides a water heater. In some embodiments, the water heater specifically refers to an electric water heater.

[0055] Specifically, the water heater provided by the present embodiment includes a shell 200, an inner container (not shown in the figure) and an electric wall shield assembly 100, and the inner container is contained in the containing space of the shell 200. The water inlet pipe and the water outlet pipe capable of penetrating the shell 200 are connected to the container wall of the inner container. In order to prevent the water heater from leaking electricity, the end of the water inlet pipe and the water outlet pipe is provided with an electric wall, and the electric wall shield assembly 100 is connected to the outside of the shell 200 and covers the electric wall.

[0056] Figure 3 A structural schematic diagram of the electric wall shield assembly 100 and the control panel assembly 300 provided by the present embodiment is shown. Figure 4 A partial enlarged view at A is shown. Figure 3 A partial enlarged view at A is shown. Figure 5 A structural schematic diagram of the electric wall shield provided by the present embodiment is shown. As Figures 3-5 and in combination with Figure 2As shown, the electric wall shield assembly 100 comprises the electric wall shield 10 and the dial 20, the electric wall shield 10 is provided with an opening 120, the dial 20 is movably arranged on the opening 120, and the dial 20 is provided with a through hole 21 for the water inlet pipe and / or the water outlet pipe to pass through. By movably arranging the dial 20 at the opening 120 of the electric wall shield 10, the position of the through hole 21 relative to the opening 120 can be changed, so that the electric wall shield assembly 100 can be adapted to the inner container with the water inlet pipe and / or the water outlet pipe in different positions, thereby improving the adaptability of the electric wall shield assembly 100, and compared with the prior art scheme of fixing the dial on the electric wall shield, it is not necessary to separately process multiple molds for matching different models of electric wall shields during production, thereby saving production cost and facilitating maintenance.

[0057] Optionally, the electric wall shield 10 is provided with a first limiting structure 121 and a second limiting structure 122, the first limiting structure 121 and the second limiting structure 122 are respectively located on both sides of the opening 120, and the dial 20 is movably arranged between the first limiting structure 121 and the second limiting structure 122. By arranging the first limiting structure 121 and the second limiting structure 122, the movement range of the dial 20 can be limited, and when the dial 20 abuts against the first limiting structure 121 or the second limiting structure 122, the dial 20 can be matched with the water inlet pipe and / or the water outlet pipe at different positions respectively, so as to further improve the use range of the electric wall shield assembly 100.

[0058] In the embodiment, the first limiting structure 121 and the second limiting structure 122 are arranged along a first direction, that is, the dial 20 is movably mounted on the electric wall shield 10 along the first direction. The first direction is the length direction of the shell 200, and is also the length direction of the electric wall shield 10.

[0059] Figure 6 is Figure 5 part structure schematic view. As Figure 6 and in combination with Figure 4 shown, the electric wall shield 10 is further provided with a guide 123, the guide 123 comprises a guide connecting part 1231 and a guide part 1232 connected with each other, one end of the guide connecting part 1231 away from the guide part 1232 is connected to the electric wall shield 10, the guide part 1232 and the electric wall shield 10 form a guide channel therebetween, the dial 20 is limited between the guide part 1232 and the electric wall shield 10 and can move along the first direction in the guide channel. The arrangement of the guide 123 not only provides guidance for the movement of the dial 20 along the first direction, but also limits the movement of the dial 20 along the axis direction of the through hole 21, and at the same time ensures the stability of the assembly between the electric wall shield 10 and the dial 20.

[0060] In the embodiment, the opening 120 is provided with a guide 123 on both sides to further improve the stable assembly between the electrically protective wall cover 10 and the dial 20. The guide 123 is arranged on the outside of the side of the opening 120 extending in the first direction.

[0061] As shown in Figure 2 , Figure 5 and Figure 6 , the electrically protective wall cover 10 is provided with a clamping piece 113, and the shell 200 is provided with a clamping hole 201. The clamping piece 113 is clamped in the clamping hole 201 to ensure the stable connection between the electrically protective wall cover 10 and the shell 200, which is simple in structure and convenient to assemble. Alternatively, the number of clamping pieces 113 is at least two, and the at least two clamping pieces 113 are arranged at intervals in the first direction, and each clamping piece 113 corresponds to a clamping hole 201 to further improve the stability of the connection between the electrically protective wall cover 10 and the shell 200.

[0062] Specifically, the clamping piece 113 includes a clamping connecting part 1131 and a hooking part 1132. The clamping connecting part 1131 can pass through the clamping hole 201, and the hooking part 1132 can be hooked on the edge of the clamping hole 201. In the embodiment, the hooking part 1132 is arranged at an angle with the clamping connecting part 1131 and extends in the first direction. When the electrically protective wall cover 10 is assembled with the shell 200, the operator can align the hooking part 1132 of the clamping piece 113 with the clamping hole 201 on the shell 200 and then push the electrically protective wall cover 10 in the extension direction of the hooking part 1132 to realize the assembly of the electrically protective wall cover 10 and the shell 200, which is convenient to operate and high in assembly efficiency.

[0063] Alternatively, the electrically protective wall cover assembly 100 further includes a fastener. The electrically protective wall cover 10 is provided with a connecting column 124, and the fastener passes through the connecting column 124 and is fixedly connected with the shell 200. After the electrically protective wall cover 10 is positioned on the shell 200 by the clamping piece 113, the electrically protective wall cover 10 and the shell 200 are fixed by the fastener. Specifically, the connecting column 124 is of a hollow structure, the fastener is preferably a screw, and the shell 200 is provided with a through hole. During installation, the screw is screwed into the through hole of the shell 200 through the connecting column 124 to firmly fix the electrically protective wall cover 10 and the shell 200. The hollow design of the connecting column 124 can embed the screw in the connecting column 124, avoiding the screw protruding outward from the electrically protective wall cover 10 and improving the overall aesthetics of the water heater.

[0064] In the embodiment, the number of connecting columns 124 is multiple, and each connecting column 124 corresponds to a fastener and a through hole on the shell 200 to ensure that the electrically protective wall cover 10 is firmly fixed on the shell 200. Of course, in other embodiments, the number of connecting columns 124 can be adaptively increased or decreased, which is not limited herein.

[0065] As shown in Figure 2 and Figure 5 The water heater further comprises a control panel assembly 300, and the anti-electricity wall cover 10 is provided with a mounting opening 110 for mounting the control panel assembly 300. Specifically, the anti-electricity wall cover 10 comprises a front side plate 11, a bottom side plate 12 and a connecting plate 13, the bottom side plate 12 is arranged at an angle with the front side plate 11 and connected with the front side plate 11; two connecting plates 13 are respectively located on both sides of the front side plate 11, and each connecting plate 13 is connected with the front side plate 11 and the bottom side plate 12. Among them, the mounting opening 110 is opened on the front side plate 11, and the clamping piece 113 is arranged on the front side plate 11; the opening 120 is opened on the bottom side plate 12, and the first limiting structure 121, the second limiting structure 122 and the guide piece 123 are arranged on the bottom side plate 12.

[0066] In the related art, the anti-electricity wall cover usually has the following problems in the injection molding process: 1) In order to adapt to the shape of the control panel, the mounting opening is usually in a long strip shape, and if the pressure control is not good during injection molding, it is easy to cause the anti-electricity wall cover to shrink in the length direction, and the mounting opening is also prone to deformation, thereby affecting the appearance quality of the finished anti-electricity wall cover and affecting the assembly of the anti-electricity wall cover and the control panel. 2) In order to adapt to the shape of the shell of the water heater, the free edge of the connecting plate is usually arc-shaped, and if the pressure control is not good during injection molding, it will also affect the arc and roundness of the free edge of the connecting plate, thereby affecting the assembly of the anti-electricity wall cover and the shell, causing the assembled water heater to have a gap between the anti-electricity wall cover and the shell, affecting the appearance quality and reducing the user's experience.

[0067] In order to solve the above problems, in the embodiment, the mounting opening 110 has two first inner walls 111 arranged opposite to each other and extending along a first direction, and each first inner wall 111 is formed with an injection mark structure, which is a connecting structure between the auxiliary support column cut off and the first inner wall 111. Among them, the first direction is the length direction of the front side plate 11 or the length direction of the bottom side plate 12.

[0068] The anti-electric wall cover 10 provided by the embodiment forms the injection mark structure on the first inner wall 111 of the mounting port 110, and the injection mark structure is the connecting structure between the auxiliary support column which is cut off and the first inner wall 111. When forming, the auxiliary support column can provide the injection pressure maintaining effect for the anti-electric wall cover 10 in the injection molding process. On the one hand, the shrinkage of the anti-electric wall cover 10 in the length direction during injection molding can be avoided, and the deformation of the mounting port 110 can be prevented. On the other hand, the auxiliary support column can play a restraining effect on the connecting plate 13, so as to ensure the curvature and roundness of the connecting plate 13, and further ensure the injection effect and appearance quality of the anti-electric wall cover 10. The injection mark structure is formed on the anti-electric wall cover 10 after forming, which can provide positioning for the assembly between the anti-electric wall cover 10 and the control panel assembly 300, and further ensure that the anti-electric wall cover 10 and the control panel assembly 300 can be accurately assembled. In addition, since the anti-electric wall cover 10 has good injection effect and appearance quality, the assembly effect between the anti-electric wall cover 10 and the control panel assembly 300 and between the anti-electric wall cover 10 and the shell 200 can be ensured, and the flash gap between the anti-electric wall cover 10 and the shell 200 can be avoided, so as to affect the user experience.

[0069] Specifically, as shown in Figure 5 and Figure 6 , the mounting port 110 includes two first inner walls 111 extending along a first direction and two second inner walls 112 extending along a second direction. The two first inner walls 111 and the two second inner walls 112 are alternately arranged and connected in sequence at the head and tail to enclose the mounting port 110. The length of the first inner wall 111 is greater than the length of the second inner wall 112, and the two ends of the auxiliary support column are connected to the two first inner walls 111 respectively, so as to avoid the deformation of the two first inner walls 111 in the direction close to each other due to the longer length during injection molding. The second direction is the width direction of the front side plate 11.

[0070] Optionally, the injection mark structures on the two first inner walls 111 are arranged one by one in correspondence, and the connecting line direction of the corresponding injection mark structures is perpendicular to the first direction. It can be understood that the connecting line direction of the corresponding injection mark structures is the length direction of the auxiliary support column, that is, the length direction of the auxiliary support column is perpendicular to the first direction, so as to provide good injection pressure maintaining effect for the entire anti-electric wall cover 10 through the two first inner walls 111, thereby ensuring the forming effect of the anti-electric wall cover 10. In the embodiment, the auxiliary support column is in a cylindrical shape, and the length direction specifically refers to the axis direction of the auxiliary support column. In other embodiments, the auxiliary support column can also be in a prismatic shape, and the length direction of the auxiliary support column specifically refers to the length direction of the side edge.

[0071] As shown in Figure 5 and Figure 6As shown, each connecting plate 13 is provided with a reinforcing rib 130 between the bottom side plate 12. By arranging the reinforcing rib 130, the structural strength between the bottom side plate 12 and the connecting plate 13 can be increased, while the curvature and arc shape of the free edge of the connecting plate 13 are ensured, avoiding deformation of the connecting plate 13 during injection molding, thereby ensuring accurate assembly between the finished product of the anti-electric wall cover 10 and the shell 200.

[0072] Optionally, a plurality of reinforcing ribs 130 are arranged between each connecting plate 13 and the corresponding bottom side plate 12 in the third direction to further improve the connection strength between the connecting plate 13 and the corresponding bottom side plate 12, avoiding deformation of the connecting plate 13 during molding. The third direction is the width direction of the bottom side plate 12.

[0073] Optionally, the reinforcing rib 130 can be an L-shaped structure, a trapezoidal structure or a triangular structure, which is simple in structure, easy to process and has high connection strength.

[0074] In this embodiment, the anti-electric wall cover 10 is integrally injection molded by using a High Impact Polystyrene (HIPS) material, which has the advantages of low cost, good molding performance and good dimensional stability.

[0075] Embodiment Two

[0076] Figure 7 The anti-electric wall cover 10 and the flow channel structure provided by the embodiment are shown in the schematic view. Figure 8 The flow chart of the anti-electric wall cover injection molding method provided by the embodiment is shown in the flow chart. Figures 7-8 And in combination with Figure 5 As shown, the embodiment provides an anti-electric wall cover injection molding method for manufacturing the anti-electric wall cover 10 provided by the first embodiment.

[0077] Specifically, the anti-electric wall cover injection molding method comprises the following steps:

[0078] Step S1: providing an anti-electric wall cover injection mold 1000, the anti-electric wall cover injection mold 1000 is used for injection molding of the anti-electric wall cover 10, the anti-electric wall cover injection mold 1000 has an injection molding cavity, a main flow channel structure 1010 and an auxiliary flow channel structure 1020, the outlet of the main flow channel structure 1010 is connected with the injection molding cavity, the injection molding cavity has a first molding surface, the first molding surface is used for molding the first inner wall 111 of the mounting port 110 on the front side plate 11, and the two ends of the auxiliary flow channel structure 1020 are connected with the first molding surface respectively;

[0079] Step S2: setting the injection molding process parameters;

[0080] Step S3: open the main runner structure 1010, and form the front side plate 11, the bottom side plate 12 and the connecting plate 13 in the injection cavity, and form the auxiliary support column in the auxiliary runner structure 1020;

[0081] Step S4: cut off the auxiliary support column, and form the injection mark structure on the first inner wall 111.

[0082] The injection molding method of the anti-electric wall cover provided by the embodiment, by setting the auxiliary runner structure 1020, on one hand, the auxiliary runner structure 1020 can guide flow during injection, so as to obviously reduce the injection pressure, on the other hand, the auxiliary support column corresponding to the position of the auxiliary runner structure 1020 can be formed, so as to effectively support the first forming surface, so as to avoid deformation of the anti-electric wall cover 10 at the position of the installation port 110, and at the same time, the shrinkage of the anti-electric wall cover 10 in the length direction can be prevented, and the curvature and roundness at the connecting plate 13 can be ensured, so as to improve the forming effect and the appearance quality of the finished product of the anti-electric wall cover 10. In addition, after the anti-electric wall cover 10 is demolded, the auxiliary support column can be manually cut off, so as to form the injection mark structure on the first inner wall 111, and the injection mark structure can provide positioning for the assembly between the anti-electric wall cover 10 and the control panel assembly 300, so as to ensure that the anti-electric wall cover 10 and the control panel assembly 300 can be accurately assembled.

[0083] As shown in Figure 7 The number of the auxiliary runner structure 1020 is at least two, and the at least two auxiliary runner structures 1020 are arranged in the first direction, so as to further improve the supporting effect at the installation port 110, improve the flow efficiency, reduce the injection pressure, and ensure that the finished product of the anti-electric wall cover 10 has the best appearance quality. In the embodiment, the number of the auxiliary runner structure 1020 is three, which can ensure the appearance quality of the finished product of the anti-electric wall cover 10, reduce the number of the auxiliary runner structure 1020, and thus simplify the manufacturing process of the anti-electric wall cover injection mold 1000 and reduce the manufacturing cost. Of course, the number of the auxiliary runner structure 1020 is not limited in the embodiment, and the designer can adaptively adjust it according to the actual product demand.

[0084] As shown in Figure 7 and in combination with Figure 5As shown, the bottom side plate 12 is provided with an opening 120, and the injection cavity further has a second forming surface for forming an end surface of the bottom side plate 12 and a third forming surface for forming an inner wall of the opening 120. The main runner structure 1010 includes a first injection runner 1011 and a second injection runner 1012, an outlet of the first injection runner 1011 is directed to be perpendicular to the second forming surface, and an outlet of the second injection runner 1012 is directed to be perpendicular to the third forming surface. By adopting the first injection runner 1011 and the second injection runner 1012 for split injection, and cooperating with the auxiliary runner structure 1020, the pressure in the injection process can be effectively reduced, the appearance quality of the injection product can be significantly improved, the deformation of the anti-electric wall cover 10 at the position of the mounting hole 110 can be avoided, the shrinkage of the anti-electric wall cover 10 in the length direction can be prevented, and the curvature and roundness at the connecting plate 13 can be ensured.

[0085] In the embodiment, the number of the first injection runners 1011 is two, and each of the first injection runners 1011 forms a valve gate on the second forming surface; the number of the second injection runners 1012 is two, and each of the second injection runners 1012 forms a valve gate on the third forming surface. In the step S3, the corresponding valve gates are opened in a set order to perform the multi-point sequential valve gate injection. The number of the first injection runners 1011 and the number of the second injection runners 1012 are not limited in the embodiment, and the designer can adaptively adjust the number of the first injection runners 1011 and the number of the second injection runners 1012 according to the actual product demand, and the number of the first injection runners 1011 and the number of the second injection runners 1012 can be equal or not equal.

[0086] The sequential valve hot runner is a kind of hot runner system in which the nozzle valve is opened in a controllable time sequence, and the sequential valve hot runner enables multiple valve gates to be opened in a preset order. The sequential opening of the multiple valve gates is conducive to optimizing the melt filling path, thereby reducing product defects. In addition, the sequential valve hot runner has the advantages of precise control, high flexibility, and high forming quality. The sequential valve hot runner not only can precisely control the opening order of the valve gates, but also can shorten the forming cycle by reducing the holding pressure time and the cooling time, and reduce the waste rate by precisely controlling to reduce defects such as flash and short shots. The sequential valve hot runner is especially suitable for complex multi-cavity molds. In addition, the sequential valve hot runner can realize multi-gate cooperation, especially in large or irregular parts, the filling speed of different regions can be dynamically adjusted, and the flow channel waste can be reduced without the need for trimming the flow channel. Sequential filling can also reduce the peak pressure when filling simultaneously, save energy, and thus achieve the purpose of reducing injection pressure.

[0087] Optionally, the main runner structure 1010 further comprises a total runner 1013, and the first injection runner 1011 and the second injection runner 1012 are both communicated with the total runner 1013. In this way, the injection material can be distributed into the first injection runner 1011 and the second injection runner 1012 through the total runner 1013.

[0088] In some embodiments, in step S2, setting the injection molding process parameters specifically includes: barrel temperature: 210-230℃; mold temperature: 40-50℃; injection speed: 35% for the first stage, 55% for the second stage, 45% for the third stage, and 30% for the fourth stage; injection pressure: 110-130 Bar for the first stage, 100-120 Bar for the second stage, 70-90 Bar for the third stage, and 50-70 Bar for the fourth stage; and holding pressure: 50-60 Bar for the first stage and the second stage.

[0089] Regarding the barrel temperature, by setting the barrel temperature to 210-230℃, a balance between flowability, plasticizing quality, and degradation risk can be achieved, thereby ensuring the molding quality of the anti-electric wall cover 10. Using 210-230℃ as the barrel temperature can make most engineering plastics reach an ideal melting state, reduce injection resistance, and ensure smooth filling of thin-walled or complex structures. Exemplarily, the barrel temperature can be 210℃, 212℃, 214℃, 215℃, 216℃, 218℃, 220℃, 222℃, 225℃, 226℃, 228℃, 230℃, etc. Of course, the barrel temperature can also be selected from other values within the range of 210-230℃.

[0090] Regarding the mold temperature, by setting the mold temperature to 40-50℃, the crystallinity and mechanical properties can be optimized, further improving the tensile strength, rigidity, and chemical resistance of the finished product. Exemplarily, the mold temperature can be 41℃, 42℃, 43℃, 44℃, 45℃, 46℃, 47℃, 48℃, 49℃, 50℃, etc. Of course, the mold temperature can also be selected from other values within the range of 40-50℃.

[0091] In the injection molding process, using segmented injection speed control is a strategy for fine-tuning the melt flow, especially suitable for high-precision, complex structure or appearance requirements of products, such as the structure of the anti-electric wall cover 10 needed to be manufactured in Example One. Setting the first segment injection speed to 35% of the rated speed of the injection molding equipment can fill the main cavity at high speed to avoid premature cooling of the melt front; setting the second segment injection speed to 55% of the rated speed of the injection molding equipment can reduce the speed moderately to balance the flow front and reduce jet marks or air traps; setting the third segment injection speed to 45% of the rated speed of the injection molding equipment can control the melt convergence at low speed to reduce the visibility of the weld line and improve the bonding strength; setting the fourth segment injection speed to 30% of the rated speed of the injection molding equipment can be extremely low to maintain pressure and shrinkage, reduce internal stress, prevent flash or overpressure deformation.

[0092] Regarding the injection pressure, the first segment injection pressure is set to a high pressure of 110 Bar to 130 Bar to quickly push the melt to overcome the resistance of the gate and the inlet of the flow channel, ensure that the melt quickly fills the front end of the cavity, and avoid product surface depression or short shot due to insufficient filling; when the melt enters the main flow channel of the cavity, the injection pressure is set to 100 Bar to 120 Bar for the second segment to balance the filling speed and the viscosity of the melt, avoid melt shear overheating or flash due to excessive pressure; the third segment injection pressure is set to 70 Bar to 90 Bar to control the slow filling of the remaining cavity by the melt, avoid weld marks or bubbles due to sudden pressure changes; the fourth segment injection pressure is set to 50 Bar to 70 Bar to compensate for the cooling shrinkage of the melt and prevent the product from warping or sagging due to uneven shrinkage. Preferably, the injection pressure of each segment can be: 120 Bar for the first segment, 110 Bar for the second segment, 80 Bar for the third segment, and 60 Bar for the fourth segment. Of course, this embodiment is not limited thereto, and the designer can adjust the injection pressure of each segment according to the actual product requirements.

[0093] In the injection molding process, the segmented pressure holding process can be used to divide the pressure holding stage into multiple pressure / time intervals, and set different parameters for different stages, which can significantly optimize product quality, improve production efficiency and reduce defect rate. The first stage pressure holding pressure is set to 50 Bar-60 Bar, which can quickly compensate for the initial shrinkage of the melt due to cooling, preventing product surface depression or shrinkage. The second stage pressure holding pressure is set to 50 Bar-60 Bar, which can stabilize the shrinkage compensation while avoiding the accumulation of residual stress caused by sudden pressure drop, thereby improving product quality. Exemplarily, the first stage pressure holding pressure can be set to 40 Bar, 51 Bar, 52 Bar, 53 Bar, 54 Bar, 55 Bar, 56 Bar, 57 Bar, 58 Bar, 59 Bar, 60 Bar, etc. The second stage pressure holding pressure can be set to 40 Bar, 51 Bar, 52 Bar, 53 Bar, 54 Bar, 55 Bar, 56 Bar, 57 Bar, 58 Bar, 59 Bar, 60 Bar, etc. Of course, the pressure holding pressure of each stage can also be other values within the range of 50 Bar-60 Bar, which is not limited here.

[0094] In one specific embodiment, the barrel temperature can be set to 220°C. The mold temperature is 45°C. The first stage injection speed is 35% of the rated speed of the injection molding equipment, the second stage injection speed is 55% of the rated speed of the injection molding equipment, the third stage injection speed is 45% of the rated speed of the injection molding equipment, and the fourth stage injection speed is 30% of the rated speed of the injection molding equipment. The first stage pressure holding pressure is 55 Bar, and the second stage pressure holding pressure is 55 Bar; the injection time is 3.2s, wherein the first stage pressure holding time is 1s, the second stage pressure holding time is 2s, and the cooling time is 30s.

[0095] Continue as Figure 7As shown, the valve gates formed by the two first injection runners 1011 on the second molding surface are defined as the first valve gate G1 and the second valve gate G2, and the valve gates formed by the two second injection runners 1012 on the third molding surface are defined as the third valve gate G3 and the fourth valve gate G4. In this embodiment, during injection, the third valve gate G3 is first opened; after a first preset time t1, the fourth valve gate G4 is opened; after a second preset time t2, the first valve gate G1 and the second valve gate G2 are simultaneously opened. By using this injection mode, the melt can be supplemented into the shrinkage area by continuous pressure, which not only optimizes the feeding effect and reduces the occurrence of sink marks, but also greatly reduces the sink marks and bubbles caused by cooling during filling. This mode also enables the melt material to fully fuse and converge, ensuring that the material is fully compacted before solidification, improving the mechanical strength and mechanical properties of the product; it can avoid backflow of the melt material or pressure imbalance, ensure that the holding pressure is timely and effectively transmitted to the cavity, maintain the consistency of the melt flow direction, and improve the appearance quality and production yield of the injection molded product by delaying the opening of the hot runner and cooperating with the holding. Delaying the opening of the hot runner can avoid melt flow, ensure that the mold is completely closed and the melt pressure is reduced before injection, reduce the probability of flash generation, adjust the filling order and pressure of each cavity, improve the balance of injection flow, and ensure that the melt enters the cavity smoothly to improve the surface quality of the product.

[0096] In this embodiment, t1 = 1 s; t2 = 2.5 s. Of course, in other embodiments, t1 can also be any value between 0.6 s and 1.5 s; t2 can also be any value between 2.0 s and 3.0 s. For example, t1 can be 0.7 s, 0.8 s, 0.9 s, 1.1 s, 1.2 s, 1.3 s, 1.4 s, etc.; t2 can be 2.1 s, 2.2 s, 2.3 s, 2.4 s, 2.6 s, 2.7 s, 2.8 s, 2.9 s, 3.0 s, etc.

[0097] It should be noted that the first valve gate G1, the second valve gate G2, the third valve gate G3 and the fourth valve gate G4 all participate in the holding process to ensure the consistency of the finished product.

[0098] It should be noted that after injection molding is completed, the sprue formed at the first valve gate G1 and the second valve gate G2 can be automatically separated from the product; the sprue formed at the third valve gate G3 and the fourth valve gate G4 needs to be manually removed.

[0099] In some embodiments, Moldflow is used to simulate and analyze the three-dimensional model of the anti-electric wall cover injection mold 1000. Through simulation analysis, it is known that the maximum injection pressure during injection is 57.68 MPa, the pressure drops sharply, and the molding requirements are met at the same time.

[0100] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. An anti-electric wall cover for a water heater, characterized in that: The anti-electricity wall cover comprises: A front side panel (11), wherein the front side panel (11) is provided with an installation opening (110) for installing a control panel, the installation opening (110) having two first inner walls (111) arranged opposite to each other and extending along a first direction, each of the first inner walls (111) being formed with an injection molding mark structure, the injection molding mark structure being a connection structure between the sheared auxiliary support column and the first inner wall (111); A bottom side plate (12) is arranged at an angle to and connected to the front side plate (11); Connecting plates (13), two connecting plates (13) are respectively located on both sides of the front side plate (11), and each connecting plate (13) is connected to the front side plate (11) and the bottom side plate (12).

2. The electric shock wall cover according to claim 1, characterized in that: At least two of the injection mark structures are provided on each of the first inner walls (111), and the at least two injection mark structures are spaced apart along the extension direction of the corresponding first inner wall (111).

3. The electric shock wall cover according to claim 2, characterized in that: The injection mark structures on the two first inner walls (111) are arranged in a one-to-one correspondence, and the connection direction of the corresponding injection mark structures is perpendicular to the first direction.

4. The electric shock wall cover according to claim 1, characterized in that: The installation opening (110) further comprises two second inner walls (112) arranged opposite to each other and extending along a second direction, the length of the first inner wall (111) being greater than the length of the second inner wall (112); wherein the second direction is perpendicular to the first direction.

5. The electric shock wall cover according to claim 1, characterized in that: A reinforcing rib (130) is provided between each of the connecting plates (13) and the bottom side plates (12).

6. The electric shock wall cover according to claim 5, characterized in that: A plurality of reinforcing ribs (130) spaced apart along a third direction are provided between each connecting plate (13) and the bottom side plate (12) on the corresponding side; wherein the first direction is perpendicular to the third direction; And / or, the reinforcing rib (130) is an L-shaped structure, a trapezoidal structure or a triangular structure.

7. The electric shock wall cover according to any one of claims 1 to 6, characterized in that: A snap-fitting piece (113) is provided on the front side plate (11), a snap-fitting hole (201) corresponding to the snap-fitting piece (113) is provided on the shell (200) of the water heater, and the snap-fitting piece (113) is snap-fitted into the snap-fitting hole (201); And / or, a connecting column (124) is provided on the bottom side plate (12), and a fastener can pass through the connecting column (124) and then be threadedly connected to the shell (200) of the water heater; And / or, an opening (120) is provided on the bottom side plate (12), a first limiting structure (121) and a second limiting structure (122) are provided on opposite sides of the opening (120), and the paddle (20) is mounted on the bottom side plate (12) and is slidably provided between the first limiting structure (121) and the second limiting structure (122).

8. A method for injection molding an electric shock wall cover, characterized in that: For manufacturing the anti-electrical wall cover according to any one of claims 1 to 7, the anti-electrical wall cover injection molding method comprises the following steps: Step S1: providing an injection mold for an electric shock wall cover, the injection mold for the electric shock wall cover being used for injection molding the electric shock wall cover, the injection mold for the electric shock wall cover comprising an injection molding cavity, a main flow channel structure (1010) and an auxiliary flow channel structure (1020), the outlet of the main flow channel structure (1010) being connected to the injection molding cavity, the injection molding cavity comprising a first molding surface, the first molding surface being used for molding a first inner wall (111) of the mounting opening (110) on the front side plate (11), and the two ends of the auxiliary flow channel structure (1020) being respectively connected to the first molding surface; Step S2: setting injection molding process parameters; Step S3: opening the main flow channel structure (1010), and forming a front side plate (11), a bottom side plate (12) and a connecting plate (13) in the injection mold cavity, and simultaneously forming an auxiliary support column in the auxiliary flow channel structure (1020); Step S4: cutting off the auxiliary support column and forming an injection mark structure on the first inner wall (111).

9. The injection molding method of the electric shock wall cover according to claim 8, characterized in that: The number of the auxiliary flow channel structures (1020) is at least two, and the at least two auxiliary flow channel structures (1020) are arranged at intervals along the first direction.

10. The method for injection molding of an electric shock wall cover according to claim 8, characterized in that: The main channel structure (1010) has a plurality of valve gates. In the step S3, the corresponding valve gates are opened in a set order to perform multi-point sequential valve gate injection molding.

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