Injection molding shell and household appliance

Abstract

The injection molding shell comprises a shell body, the shell body is provided with an outer side vertical wall and an end plate body located on the inner side of the outer side vertical wall, a plurality of connecting structures are formed on the inner side wall face of the outer side vertical wall, and a pouring gate is formed in the end plate body; one connecting structure closest to the pouring gate in the multiple connecting structures is a first connecting structure, the first connecting structure comprises a connecting vertical rib plate arranged with the inner side wall face of the outer side vertical wall at intervals, at least two transverse ribs are arranged between the connecting vertical rib plate and the inner side wall face, and the transverse ribs are arranged in the length direction of the connecting vertical rib plate at intervals; the transverse ribs penetrate in the width direction of the connecting vertical rib plate and comprise first rib sections connected with the inner side wall face of the outer side vertical wall in the direction from the connecting vertical rib plate to the outer side vertical wall, and the material thickness of the first rib sections is smaller than that of the outer side vertical wall. According to the invention, the defect that air marks are formed on the outer surface of the outer vertical wall is effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of household appliance design, and in particular relates to an injection molded shell and a household appliance. Background Art

[0002] As people's living standards gradually improve, people's demand for household appliances is not only high quality and multi-function, but also more and more attention is paid to the appearance quality of the products. Beautiful appearance can attract people's attention, so appearance quality has become the focus of all home appliance manufacturers. In the process of injection molding of home appliance shell production, gas marks may be generated, which have a great impact on the appearance of the product. In the case of minor impacts, the appearance quality and product grade of the product will be affected, and in the case of major impacts, the strength of the product will be affected. If the strength of the product shell is not enough, it will affect the product structure and transportation, and even affect electrical safety. Therefore, in the product design stage, various design schemes are used to overcome the surface gas mark defects in the product production process.

[0003] Gas marks are mainly caused by the fact that during the shell injection molding process, when the plastic melt fills the mold cavity, the air in the mold cavity has been wrapped at the front of the injection flow melt. When the two melts meet or the filling is completed, these gases cannot be directly discharged from the mold cavity. During the injection molding process, the injection pressure increases, the wrapped gas is compressed, and as the injection molded part cools and solidifies, gas marks are formed on the surface of the injection molded part. Especially when the corresponding connection structure is set on the inner side of the shell, the phenomenon of the aforementioned gas marks on the shell surface is particularly serious. Summary of the invention

[0004] Therefore, the present invention provides an injection molded housing and a household appliance, which can overcome the technical problem in the prior art that air marks are easily generated at the connection between the outer surface of the injection molded housing and the inner connecting structure, which leads to reduced appearance quality, insufficient strength, and even electrical safety hazards.

[0005] In order to solve the above problems, the present invention provides an injection molded shell, including a shell body, the shell body having an outer wall and an end plate body located on the inner side of the outer wall, a plurality of connecting structures are formed on the inner wall surface of the outer wall, a gate is formed on the end plate body, and the one closest to the gate among the plurality of connecting structures is a first connecting structure, the first connecting structure includes a connecting vertical rib plate spaced apart from the inner wall surface of the outer wall, at least two transverse ribs are arranged between the connecting vertical rib plate and the inner wall surface, each of the transverse ribs is spaced apart along the length direction of the connecting vertical rib plate, and the transverse ribs pass through along the width direction of the connecting vertical rib plate, from the connecting vertical rib plate to the direction of the outer wall, the transverse rib includes a first rib segment connected to the inner wall surface of the outer wall, and the material thickness of the first rib segment is less than the material thickness of the outer wall.

[0006] In some embodiments, the material thickness of the first rib segment is 0.4 to 0.5 times the material thickness of the outer vertical wall; and / or the transverse rib also includes a second rib segment connected to the connecting vertical rib plate, the second rib segment is sequentially connected to the first rib segment along a direction close to the outer vertical wall, and the material thickness of the second rib segment is greater than the material thickness of the first rib segment.

[0007] In some embodiments, the material thickness of the second rib segment is not less than the material thickness of the outer wall; and / or, the length of the second rib segment extending toward one side of the outer wall is greater than the length of the first rib segment extending toward one side of the outer wall.

[0008] In some embodiments, the material thickness of the second rib segment is 1.2 to 1.4 times the material thickness of the outer vertical wall.

[0009] In some embodiments, the shell body is box-shaped, the end plate body forms the bottom wall of the shell body, the transverse rib closest to the opening of the shell body among at least two of the transverse ribs is an assembly transverse rib, and a threaded connecting column and / or a buckle are formed on the outer end surface of the assembly transverse rib; and / or an air inlet grille is formed on the end plate body.

[0010] In some embodiments, the length of the first rib segment of the assembly transverse rib in the same first connecting structure extending toward the outer wall is shorter than the length of the first rib segment of each other transverse rib extending toward the outer wall.

[0011] In some embodiments, the geometric center of the gate is located on the width symmetry center plane of the connecting vertical rib plates.

[0012] In some embodiments, the end plate body has two gates, both of which are located on the width symmetry center plane and respectively on the left and right sides of the geometric center of the end plate body, and the first connecting structure has two, and the two first connecting structures are symmetrical about the geometric center of the end plate body.

[0013] The present invention also provides a household appliance, comprising the above-mentioned injection-molded housing.

[0014] In some embodiments, the household appliance is a fan heater, and the injection-molded housing is an air inlet box of the fan heater.

[0015] The injection molded housing and household appliance provided by the present invention have the following beneficial effects:

[0016] By connecting the connecting vertical rib plate in the first connecting structure closest to the gate required by the injection molding process and the outer wall through at least two transverse ribs, and designing the material thickness of the first rib section connected to the inner wall surface of the outer wall to be smaller than the material thickness of the outer wall, and eliminating the side ribs arranged continuously up and down on at least one side of the connecting vertical rib plate in the prior art, when the injection molding shell of the present invention is injection molded, the injection flow formed by the injection plastic injected by the gate can flow more quickly to the position where the outer wall and the transverse ribs are connected, thereby effectively preventing the defect of forming air marks on the outer surface of the outer wall due to the injection flow of the injection molding of the first connecting structure being too close to the gate reaching the intersection of the transverse ribs and the outer wall before the injection flow of the injection molding of the outer wall, thereby improving the structural strength, drop strength, electrical safety strength and shell appearance of the shell (the product grade is improved), thereby improving the electrical safety of the electrical equipment using it; in addition, since the horizontal ribs arranged at intervals are used to replace the continuously arranged side ribs in the prior art, the amount of glue used for injection molding can be reduced, thereby saving material costs;

[0017] The material thickness of the second rib segment is greater than that of the first rib segment, which can ensure that the amount of injection plastic entering the cavity corresponding to the transverse rib is sufficient, that is, the amount of injection glue of the first rib segment can be guaranteed, thereby preventing the pore defect caused by insufficient injection glue and ensuring the structural strength of the connection structure;

[0018] The material thickness of the second rib section is 0.4 to 0.5 times the material thickness of the outer wall, so that the connection strength between the transverse rib and the outer wall can be ensured under the premise of effectively preventing the formation of air mark defects on the outer surface of the outer wall;

[0019] Among all the transverse ribs, the transverse rib with the greatest structural strength is the aforementioned assembly transverse rib, so that a reliable and stable connection between the threaded connection column machine buckle in the first connection structure and the corresponding assembly connection structural member can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of an injection-molded housing according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of a three-dimensional structure of the first connecting structure in another viewing angle (partial);

[0023] Figure 3 yes Figure 1 A bottom view of the injection molded housing in FIG.

[0024] Figure 4 yes Figure 3 Cross-section of the middle AA;

[0025] Figure 5 yes Figure 4 Schematic diagram of the local structure.

[0026] The accompanying drawings are marked as follows:

[0027] 1. Shell body; 11. Outer wall; 12. End plate; 121. Air inlet grille; 2. First connection structure; 21. Connecting vertical rib plate; 22. Transverse rib; 221. First rib segment; 222. Second rib segment; 23. Threaded connection column; 24. Buckle; 3. Second connection structure; 100. Gate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 5 As shown, according to an embodiment of the present invention, an injection molded housing is provided, comprising a housing body 1, wherein the housing body 1 has an outer wall 11 and an end plate 12 located inside the outer wall 11, as shown in FIG. Figure 1 As shown, in a specific embodiment, the outer wall 11 is arranged around the outer edge of the end plate body 12, so that the outer shell body 1 is box-shaped, and a plurality of connecting structures are formed on the inner wall surface of the outer wall 11, and a gate 100 is formed on the end plate body 12, that is, the gate 100 is located on the inner side of the outer wall 11, and the one closest to the gate 100 among the plurality of connecting structures is a first connecting structure 2, and the first connecting structure 2 includes a connecting vertical rib plate 21 spaced apart from the inner wall surface of the outer wall 11, and at least two transverse ribs 22 are arranged between the connecting vertical rib plate 21 and the inner wall surface, that is, the connecting vertical rib plate 21 is reliably connected to the inner wall surface of the outer wall 11 through at least two transverse ribs 22, and each transverse rib 22 is connected along the length of the connecting vertical rib plate 21 (that is, Figure 1 The horizontal ribs 22 are arranged in a spaced relationship along the width direction (i.e. the height direction of the azimuth shown in the figure) of the connecting vertical rib plate 21. Figure 1The transverse rib 22 is connected to the outer wall 11 from the connecting vertical rib plate 21. The transverse rib 22 includes a first rib segment 221 connected to the inner wall surface of the outer wall 11. The material thickness of the first rib segment 221 is less than the material thickness of the outer wall 11. For details, see Figure 5 As shown, the material thickness of the outer wall 11 refers to the shell wall thickness of the outer wall 11, that is, Figure 5 The left and right width of the direction shown, the material thickness of the first rib section 221 refers to Figure 5 Thickness above and below the indicated positions.

[0033] In the technical solution, the connecting vertical rib plate 21 in the first connecting structure 2 which is closest to the gate 100 required by the injection molding process is connected to the outer wall 11 through at least two transverse ribs 22, and the material thickness of the first rib segment 221 connected to the inner wall surface of the outer wall 11 is designed to be smaller than the material thickness of the outer wall 11, and the side ribs (such as the upper and lower continuous arrangement of the connecting vertical rib plate 21) on at least one side of the prior art are eliminated. Figure 1 ), so that when the injection-molded shell of the present invention is injection-molded, the injection flow formed by the injection plastic injected by the gate 100 can flow more quickly to the position where the outer wall 11 is connected to each transverse rib 22, thereby effectively preventing the first connection structure from being too close to the gate 100, so that the injection flow of the injection molding reaches the intersection of the transverse rib 22 and the outer wall 11 before the injection flow of the injection molding outer wall 11, thereby forming an air mark defect on the outer surface of the outer wall 11, thereby improving the structural strength, drop strength, electrical safety strength and shell appearance of the shell (the product grade is improved), thereby improving the electrical safety of the electrical equipment using it; in addition, since the spaced transverse ribs 22 are used to replace the continuously arranged side ribs in the prior art, the amount of glue used for injection molding can also be reduced, thereby saving material costs.

[0034] See Figure 5 As shown in the figure, injection stream 1 is the injection stream part used for injection molding the outer wall 11, and injection stream 2 is the injection stream part used for molding the first connecting structure 2. During the production injection process (i.e., the injection molding process), injection stream 1 and injection stream 2 enter the cavity from gate 100, and flow to the outer wall 11 and the corresponding cavity area of ​​the first connecting structure during the molding process of the end plate body 12. Although the injection stream 1 path is longer, the path is wider, so the resistance of injection stream 1 is smaller; and although the injection stream 2 path is shorter than the injection stream 1 path, since the transverse ribs 22 are used in the present invention to replace the side ribs extending up and down, and the transverse ribs 22 have a rib section with a material thickness less than the material thickness of the outer wall 11, the resistance of injection stream 2 is larger, so injection stream 1 will reach point A (i.e., point A) before injection stream 2. Figure 5In the process of merging the two streams, it is not easy to form air marks. On the contrary, if injection stream 2 reaches the surface of the molding mold before injection stream 1, high-speed injection will be generated on the mold wall (the cavity corresponding to the transverse rib 22 and the cavity wall corresponding to the outer wall 11 are objectively close to vertical or even vertical), and the jet cannot be wrapped by injection stream 1 after injection, resulting in the formation of gas wrapped by the difference between the two streams, and air marks are formed on the outer shell surface.

[0035] It should be noted that, for a plurality of the aforementioned connection structures provided in the same aforementioned injection molded housing, in addition to the first connection structure closest to the gate 100, other connection structures (i.e. Figure 1 The second connecting structure 3) in the embodiment does not need to be improved accordingly, that is, the transverse ribs in other connecting structures do not pass through the left and right sides thereof, but side ribs are arranged on at least one side of the transverse ribs, so as to improve the strength of each corresponding connecting structure. The reason why the side ribs are cancelled in the first connecting structure closest to the gate 100 so that the transverse ribs pass through the left and right sides and have rib sections with smaller material thickness is that the flow velocity difference between the aforementioned injection stream 1 and the injection stream 2 at the position closest to the gate 100 is too large, resulting in the injection stream 2 reaching the aforementioned point A before the injection stream 1, which in turn leads to the occurrence of air mark defects on the outer surface of the outer wall 11. According to simulation studies, for each connecting structure at other positions, the flow velocity difference between the corresponding injection stream 1 and the injection stream 2 is not large, and there is no risk of generating air mark defects on the outer surface of the outer wall of the corresponding area. Therefore, no improvement is made and the original structure can be used.

[0036] See also Figure 5 As shown, the transverse rib 22 also includes a second rib segment 222 connected to the connecting vertical rib plate 21, the second rib segment 222 and the first rib segment 221 are sequentially connected along the direction close to the outer wall 11, and the material thickness of the second rib segment 222 is greater than the material thickness of the first rib segment 221, that is, the connecting vertical rib plate 21 and the outer wall 11 are connected through the second rib segment 222 and the first rib segment 221, and the material thickness of the second rib segment 222 is greater than the material thickness of the first rib segment 221, which can ensure that the amount of injection plastic entering the corresponding cavity of the transverse rib 22 is sufficient, that is, the injection amount of the first rib segment 221 (that is, the injection amount of the injection plastic) can be guaranteed, thereby preventing the air hole defects caused by insufficient injection amount, and ensuring the structural strength of the connection structure.

[0037] In some embodiments, the material thickness of the second rib segment 222 is 0.4 to 0.5 times the material thickness of the outer wall 11, so that the connection strength between the transverse rib 22 and the outer wall 11 can be ensured while effectively preventing the formation of air mark defects on the outer surface of the outer wall 11;

[0038] In some embodiments, the material thickness of the second rib segment 222 is not less than the material thickness of the outer vertical wall 11. In a preferred embodiment, the material thickness of the second rib segment 222 is 1.2 to 1.4 times the material thickness of the outer vertical wall 11. This can further increase the amount of glue entering the cavity corresponding to the transverse rib 22, thereby ensuring the molding effect of the transverse rib 22.

[0039] The length of the second rib segment 222 extending toward the outer side wall 11 is greater than the length of the first rib segment 221 extending toward the outer side wall 11 , which can ensure the structural strength of each transverse rib 22 .

[0040] In some embodiments, the end plate body 12 forms the bottom wall of the box of the outer shell body 1, and the transverse rib 22 closest to the opening of the outer shell body 1 among at least two of the transverse ribs 22 is an assembly transverse rib, and a positioning connection structure such as a threaded connection column 23 and / or a buckle 24 is formed on the outer end surface of the assembly transverse rib, and a quick connection with another structural member is achieved through the aforementioned threaded connection column 23 and the buckle 24.

[0041] In another specific embodiment, an air inlet grille 121 is formed on the end plate body 12 to allow external airflow to enter the interior of the electrical device to which it is applied through the air inlet grille 121 .

[0042] In some embodiments, the length of the first rib segment 221 of the assembly transverse rib in the same first connecting structure 2 extending toward the side of the outer vertical wall 11 is shorter than the length of the first rib segment 221 of each of the other transverse ribs 22 extending toward the side of the outer vertical wall 11, that is, among the transverse ribs 22, the transverse rib 22 with the greatest structural strength is the aforementioned assembly transverse rib, thereby ensuring that the connection between the threaded connecting column 23 and the machine buckle 24 in the first connecting structure 2 and the corresponding assembly connecting structural parts is reliable and stable.

[0043] In some embodiments, the geometric center of the gate 100 is located on the width symmetry center plane of the connecting vertical rib plate 21. The aforementioned gate 100 is generally a circular hole, and its geometric center is also the center of the circular hole. The geometric center of the gate 100 is set on the width symmetry center plane of the connecting vertical rib plate 21. It can be understood that the corresponding transverse ribs 22 are also symmetrical about the width symmetry center plane, so that the molding consistency of each transverse rib 22 and the connecting vertical rib plate 21 can be ensured.

[0044] In a preferred embodiment, see Figure 4As shown, the end plate body 12 has two gates 100, both of which are located on the width symmetric center plane and respectively on the left and right sides of the geometric center of the end plate body 12. It can be understood that, due to the two gates 100, the corresponding connection structure closest to each gate 100, that is, the first connection structure 2, has two, and the two first connection structures 2 are symmetrical about the geometric center of the end plate body 12. In this way, while ensuring the structural injection molding filling effect, the overall appearance quality of the injection molded shell can also be ensured.

[0045] It should be noted that the injection mold adopts a tilting ejector mechanism or an internal slider and other mechanisms to realize the demoulding of the rubber connecting part.

[0046] According to an embodiment of the present invention, there is also provided a household appliance, comprising the above-mentioned injection molded shell. In a specific embodiment, the household appliance is an air heater, and the injection molded shell is an air inlet box of the air heater. Due to the use of the aforementioned injection molded shell, a connection is formed between the connecting vertical rib plate 21 in the first connecting structure 2 which is closest to the gate 100 required for the injection molding process and the outer vertical wall 11 through at least two transverse ribs 22, and the material thickness of the first rib segment 221 connected to the inner wall surface of the outer vertical wall 11 is designed to be smaller than the material thickness of the outer vertical wall 11, and the side ribs (such as the upper and lower continuous arrangement on at least one side of the connecting vertical rib plate 21) in the prior art are eliminated. Figure 1 ), so that when the injection-molded shell of the present invention is injection-molded, the injection flow formed by the injection plastic injected by the gate 100 can flow more quickly to the position where the outer wall 11 is connected to each transverse rib 22, thereby effectively preventing the first connection structure from being too close to the gate 100, so that the injection flow of the injection molding reaches the intersection of the transverse rib 22 and the outer wall 11 before the injection flow of the injection molding outer wall 11, thereby forming an air mark defect on the outer surface of the outer wall 11; in addition, since the spaced transverse ribs 22 are used to replace the continuously arranged side ribs in the prior art, the amount of glue used for injection molding can be reduced, thereby saving material costs.

[0047] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An injection molded housing, comprising a housing body (1), the housing body (1) having an outer wall (11) and an end plate (12) located inside the outer wall (11), a plurality of connection structures being formed on the inner wall surface of the outer wall (11), and a gate (100) being formed on the end plate (12), characterized in that: The one of the multiple connection structures that is closest to the gate (100) is a first connection structure (2), and the first connection structure (2) includes a connection vertical rib plate (21) spaced apart from the inner wall surface of the outer vertical wall (11), and at least two transverse ribs (22) are arranged between the connection vertical rib plate (21) and the inner wall surface, and each of the transverse ribs (22) is spaced apart along the length direction of the connection vertical rib plate (21), and the transverse rib (22) passes through the connection vertical rib plate (21) along the width direction, from the connection vertical rib plate (21) to the outer vertical wall (11), and the transverse rib (22) includes a first rib segment (221) connected to the inner wall surface of the outer vertical wall (11), and the material thickness of the first rib segment (221) is less than the material thickness of the outer vertical wall (11).

2. The injection molded housing according to claim 1, characterized in that: The material thickness of the first rib segment (221) is 0.4 to 0.5 times the material thickness of the outer vertical wall (11); and / or the transverse rib (22) further includes a second rib segment (222) connected to the connecting vertical rib plate (21), the second rib segment (222) and the first rib segment (221) are sequentially connected along a direction close to the outer vertical wall (11), and the material thickness of the second rib segment (222) is greater than the material thickness of the first rib segment (221).

3. The injection molded housing according to claim 2, characterized in that: The material thickness of the second rib segment (222) is not less than the material thickness of the outer vertical wall (11); and / or the length of the second rib segment (222) extending toward one side of the outer vertical wall (11) is greater than the length of the first rib segment (221) extending toward one side of the outer vertical wall (11).

4. The injection molded housing according to claim 3, characterized in that: The material thickness of the second rib section (222) is 1.2 to 1.4 times the material thickness of the outer vertical wall (11).

5. The injection molded housing according to claim 2, characterized in that: The outer shell body (1) is in the shape of a box, the end plate body (12) forms the bottom wall of the box of the outer shell body (1), the transverse rib (22) closest to the opening of the outer shell body (1) among at least two transverse ribs (22) is an assembly transverse rib, and a threaded connection column (23) and / or a buckle (24) are formed on the outer end surface of the assembly transverse rib; and / or an air inlet grille (121) is formed on the end plate body (12).

6. The injection molded housing according to claim 5, characterized in that: The length of the first rib segment (221) of the assembly transverse rib in the same first connection structure (2) extending toward the side of the outer vertical wall (11) is shorter than the length of the first rib segment (221) of each other transverse rib (22) extending toward the side of the outer vertical wall (11).

7. The injection molded housing according to claim 1, characterized in that: The geometric center of the gate (100) is located on the width symmetry center plane of the connecting vertical rib plate (21).

8. The injection molded housing according to claim 7, characterized in that: The end plate body (12) is provided with two gates (100), both of which are located on the width symmetry center plane and respectively on the left and right sides of the geometric center of the end plate body (12), and the first connecting structure (2) is provided with two, and the two first connecting structures (2) are symmetrical about the geometric center of the end plate body (12).

9. A household appliance, characterized in that: The invention comprises the injection molded housing according to any one of claims 1 to 8.

10. The household appliance according to claim 9, characterized in that: The household appliance is a heater, and the injection-molded shell is an air inlet box of the heater.

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