A door leaf

Abstract

The utility model discloses a door leaf, include: outer wall has first clamping portion and second clamping portion, along the width direction of door leaf, first clamping portion and second clamping portion are located the both ends of outer wall respectively, inner wall is opposite to the arrangement of outer wall along the thickness direction of door leaf, along the width direction of door leaf, the both ends of inner wall are equipped with a third clamping portion respectively, one third clamping portion in two third clamping portions cooperates with first clamping portion, and another third clamping portion cooperates with second clamping portion, to connect outer wall in inner wall, along the thickness direction, inner wall and outer wall define the filling chamber, and the filling chamber contains filling. The utility model can effectively improve the stability of the inner wall and outer wall connection of burglary -resisting door leaf.

Description

Technical Field

[0001] This utility model relates to the field of door technology, and in particular to a door. Background Technology

[0002] Security doors are widely used in residences, public places, and commercial establishments due to their security features. The door leaf is a crucial component of a security door, primarily consisting of an inner wall, an outer wall, and internal filling material. Currently, security door leaves on the market typically use welding, riveting, or screwing to connect the inner and outer walls.

[0003] However, welds, rivets, or screws produced by welding are prone to failure after long-term use, leading to structural damage to the security door. Furthermore, the welds, rivets, or screws are often exposed, which seriously affects the aesthetics of the security door. Utility Model Content

[0004] The purpose of this invention is to solve the problem that current security door panels, which use welding, riveting, or screwing to connect the inner and outer walls, are prone to failure, leading to structural damage. This invention provides a door panel that effectively improves the stability of the connection between the inner and outer walls of a security door.

[0005] To solve the above-mentioned technical problems, an embodiment of this utility model discloses a door leaf, comprising:

[0006] The outer wall has a first engaging portion and a second engaging portion, which are located at both ends of the outer wall along the width direction of the door leaf;

[0007] The inner wall is disposed opposite to the outer wall along the thickness direction of the door leaf. Along the width direction of the door leaf, each end of the inner wall is provided with a third engaging part. One of the two third engaging parts engages with the first engaging part, and the other third engaging part engages with the second engaging part to connect the outer wall to the inner wall. Along the thickness direction, the inner wall and the outer wall define a filling chamber, which contains the filling material.

[0008] By adopting the above technical solution, a first and second engaging portion are provided on the outer wall, and two third engaging portions are provided on the inner wall. One third engaging portion engages with the first engaging portion, and the other third engaging portion engages with the second engaging portion, thereby connecting the outer wall and the inner wall together. Since the embodiments of this application achieve engagement through the structure of the inner and outer walls themselves, without using fasteners (such as screws, rivets, etc.) or welding, there is no risk of fastener failure or weld failure after long-term use, resulting in a more stable connection between the inner and outer walls.

[0009] Furthermore, since the connection between the outer wall and the inner wall in this embodiment does not use fasteners (such as screws, rivets, etc.) or welding, after the outer wall and the inner wall are connected, no fasteners or welds are exposed on the outside of the door leaf, which greatly improves the aesthetics of the door leaf.

[0010] According to a specific embodiment of the present invention, the outer wall includes:

[0011] outer wall body;

[0012] The first side portion is located at one end of the outer wall body along the width direction, and the first engaging portion is located at the end of the first side portion away from the outer wall body along the thickness direction;

[0013] The second side portion is located at the other end of the outer wall body along the width direction, and the second engaging portion is located at the end of the second side portion away from the outer wall body along the thickness direction.

[0014] According to a specific embodiment of the present invention, the inner wall includes an inner wall body, and the third engaging portion includes:

[0015] The first extension includes a first end and a second end, the first end of the first extension is connected to the inner wall body, and the included angle between the first extension and the inner wall body is greater than 0° and less than 180°.

[0016] The second extension includes a first end and a second end, the first end of the second extension is connected to the second end of the first extension, and the included angle between the first extension and the second extension is greater than 0° and less than 180°.

[0017] The third extension includes a first end and a second end. The first end of the third extension is connected to the second end of the second extension. The second end of the third extension extends toward the inner wall body, and the angle between the third extension and the second extension is greater than 0° and less than 180°.

[0018] The first extension, the second extension, and the third extension define a limiting space, at least a portion of the first engaging portion is located within the limiting space of one of the third engaging portions, and at least a portion of the second engaging portion is located within the limiting space of the other of the third engaging portions.

[0019] According to a specific embodiment of the present invention, the angle between the first extension and the inner wall body is 90°; and / or

[0020] The angle between the second extension and the first extension is 90°; and / or

[0021] The angle between the third extension and the second extension is greater than 90° and less than 180°.

[0022] According to a specific embodiment of the present invention, the first engaging portion includes:

[0023] The first part includes a first end and a second end, wherein the first end of the first part is connected to the first side portion, and the angle between the first part and the first side portion is greater than 0° and less than 180°.

[0024] The second part includes a first end and a second end. The first end of the second part is connected to the second end of the first part. The second end of the second part faces away from the inner wall body. The angle between the second part and the first part is greater than 0° and less than 180°. The second end of the second part can abut against the second extension and the third extension of the third engaging part.

[0025] According to a specific embodiment of the present invention, the angle between the first portion and the first side portion is 90°; and / or

[0026] The angle between the second part and the first part is 90°.

[0027] According to a specific embodiment of the present invention, the second engaging portion includes:

[0028] The abutting portion includes a first end and a second end. The first end of the abutting portion is connected to the second side portion. Along the width direction, the second end of the abutting portion faces away from the second side portion. The abutting portion can abut against the second end of the third extension of the third engaging portion. The angle between the abutting portion and the second side portion is greater than 0° and less than or equal to 90°.

[0029] According to a specific embodiment of the present invention, the angle between the abutting portion and the second side portion is 90°.

[0030] According to a specific embodiment of the present invention, along the width direction, the distance from the second end of the abutting portion to the second end of the second portion of the first engaging portion is greater than the distance between the second ends of the two third extension portions;

[0031] The second side portion is capable of elastic deformation.

[0032] By employing the above technical solution, the distance from the second end of the abutment portion to the second end of the second part of the first engaging portion is greater than the distance between the second ends of the two third extension portions. This allows the second end of the second part of the first engaging portion to be confined within the limiting space of one third engaging portion, and the second end of the abutment portion to be confined within the limiting space of another third engaging portion, thus achieving the connection between the inner and outer walls. Simultaneously, the second side portion can undergo elastic deformation. During installation, external force causes the second side portion to elastically deform, facilitating the entry of the second end of the abutment portion into the limiting space. Removing the external force allows the second side portion to return to its original shape, thereby connecting the inner wall to the outer wall and effectively improving the installation efficiency of the inner and outer walls.

[0033] According to a specific embodiment of this utility model, the inner wall and the outer wall are made of steel. Attached Figure Description

[0034] Figure 1 A schematic diagram showing the inner and outer walls of a door connected by screws.

[0035] Figure 2 A schematic diagram showing the inner and outer walls of a door connected by rivets.

[0036] Figure 3 A schematic diagram showing the inner and outer walls of the door panel connected by welding is shown.

[0037] Figure 4 This diagram illustrates the structure of the door leaf according to an embodiment of the present invention. Figure 1 .

[0038] Figure 5 This diagram illustrates the engagement of the first and third engaging portions on the outer wall of the door leaf according to an embodiment of the present invention.

[0039] Figure 6 This diagram illustrates the engagement of the second and third engaging portions on the outer wall of the door leaf according to an embodiment of the present invention.

[0040] Figures 7-9 The diagram illustrates the steps of installing the outer wall of the door leaf of this embodiment of the present invention onto the inner wall.

[0041] Figure 10 This diagram illustrates the structure of the door leaf according to an embodiment of the present invention. Figure 2 .

[0042] Explanation of icon numbers:

[0043] 100. Door leaf;

[0044] 200. Outer wall; 201. Outer wall body; 202. First side portion; 203. Second side portion; 210. First engaging portion; 211. First part; 2111. First end of the first part; 2112. Second end of the first part; 212. Second part; 2121. First end of the second part; 2122. Second end of the second part; 220. Second engaging portion; 221. Abutting part; 2211. First end of the abutting part; 2212. Second end of the abutting part;

[0045] 300. Inner wall; 301. Inner wall body; 302. Third engaging part; 303. Limiting space; 310. First extension; 311. First end of the first extension; 312. Second end of the first extension; 320. Second extension; 321. First end of the second extension; 322. Second end of the second extension; 330. Third extension; 331. First end of the third extension; 332. Second end of the third extension.

[0046] 400. Filled chamber. Detailed Implementation

[0047] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0048] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0050] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0051] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0052] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0053] refer to Figure 1 , Figure 1 An anti-theft door leaf 10 is shown, comprising an outer wall 20 and an inner wall 30. The outer wall 20 has a first side portion 21 and a second side portion 22. Along the width direction X of the anti-theft door leaf 10, one end of the inner wall 30 is connected to the first side portion 21 by a screw 40, and the other end of the inner wall 30 is connected to the second side portion 22 by a screw 40. After long-term use, the screws 40 are prone to failure, such as breakage, leading to structural damage to the anti-theft door leaf 10. Furthermore, as... Figure 1 As shown, a portion of the screw 40 is exposed on the outside of the security door 10, which affects the aesthetics of the security door 10.

[0054] refer to Figure 2 , Figure 2 An anti-theft door leaf 10 is shown, comprising an outer wall 20 and an inner wall 30. The outer wall 20 has a first side portion 21 and a second side portion 22. Along the width direction X of the anti-theft door leaf 10, one end of the inner wall 30 is connected to the first side portion 21 by a rivet 50, and the other end of the inner wall 30 is connected to the second side portion 22 by a rivet 50. After long-term use, the rivets 50 are prone to failure, such as breakage, leading to structural damage to the anti-theft door leaf 10. Furthermore, as... Figure 2 As shown, part of the rivet 50 is exposed on the outside of the security door 10, which affects the aesthetics of the security door 10.

[0055] refer to Figure 3 , Figure 3An anti-theft door leaf 10 is shown, comprising an outer wall 20 and an inner wall 30. The outer wall 20 has a first side portion 21 and a second side portion 22. Along the width direction X of the anti-theft door leaf 10, one end of the inner wall 30 is welded to the first side portion 21, forming a weld point 60 at the junction of the first side portion 21 and the inner wall 30. The other end of the inner wall 30 is welded to the second side portion 22, forming another weld point 60 at the junction of the second side portion 22 and the inner wall 30. After prolonged use, the weld point 60 is prone to failure, such as breakage or corrosion, leading to structural damage to the anti-theft door leaf 10. Furthermore, as... Figure 3 As shown, the solder joint 60 is exposed on the outside of the security door leaf 10, which affects the aesthetics of the security door leaf 10.

[0056] refer to Figure 4 To address the aforementioned issues, this application also provides a door leaf 100, which can be used in a security door. For the sake of detailed description of the structure of the door leaf 100, the width direction X and the thickness direction Y of the door leaf 100 are defined here, and the width direction X and the thickness direction Y are perpendicular to each other.

[0057] For example, the door leaf 100 includes an outer wall 200 and an inner wall 300.

[0058] The outer wall 200 includes an outer wall body 201, a first side portion 202, a second side portion 203, a first engaging portion 210, and a second engaging portion 220. Along the width direction X, the first side portion 202 is located at one end of the outer wall body 201, and the second side portion 203 is located at the other end of the outer wall body 201, and the first side portion 202 and the second side portion 203 are disposed opposite to each other along the width direction X. Along the thickness direction Y, the first engaging portion 210 is located at the end of the first side portion 202 away from the outer wall body 201, and the second engaging portion 220 is located at the end of the second side portion 203 away from the outer wall body 201.

[0059] For example, the inner wall 300 includes an inner wall body 301 and two third engaging portions 302 (specifically, third engaging portions 302a and third engaging portions 302b). Along the width direction X, the third engaging portions 302a and third engaging portions 302b are located at both ends of the inner wall body 301.

[0060] Continue to refer to Figure 4 Along the thickness direction Y, the inner wall 300 and the outer wall 200 are arranged opposite to each other, and the third engaging part 302a cooperates with the first engaging part 210, and the third engaging part 302b cooperates with the second engaging part 220, thereby connecting the inner wall 300 and the outer wall 200.

[0061] Exemplarily, the inner wall 300 and the outer wall 200 together define a filling chamber 400. Specifically, the inner wall body 301 of the inner wall 300, the outer wall body 201 of the outer wall 200, the first side portion 202, and the second side portion 203 together define the filling chamber 400. The filling chamber 400 contains a filler (not shown in the figure). In this embodiment, the filler is a polyurethane foam material, which can effectively improve the structural strength of the door leaf 100 and enhance its impact resistance, heat insulation, and other properties.

[0062] It should be noted that this application does not impose any special restrictions on the specific material of the filler. For example, in other possible embodiments, the filler can also be honeycomb paper, rock wool, aluminum honeycomb, or other materials. The key is to effectively improve the structural strength, impact resistance, and other properties of the door leaf 100 so that it can be used in a security door.

[0063] By way of example, the door leaf 100 provided in this application embodiment connects the outer wall 200 and the inner wall 300 together by providing a first engaging portion 210 and a second engaging portion 220 on the outer wall 200 and two third engaging portions 302 (specifically, third engaging portions 302a and third engaging portions 302b) on the inner wall 300, and by engaging the third engaging portions 302a with the first engaging portion 210 and engaging the third engaging portions 302b with the second engaging portion 220. Since this application embodiment achieves engagement through the structure of the inner wall 300 and the outer wall 200 themselves, without using fasteners (such as screws, rivets, etc.) or welding, there is no risk of fastener failure or weld failure after long-term use, and the connection between the inner wall 300 and the outer wall 200 is more stable.

[0064] Furthermore, since the connection between the outer wall 200 and the inner wall 300 in this application does not use fasteners (such as screws, rivets, etc.) or welding, after the outer wall 200 and the inner wall 300 are connected, no fasteners or welds are exposed on the outside of the door leaf 100, which greatly improves the aesthetics of the door leaf 100.

[0065] For example, refer to Figure 5 , Figure 6 and combined Figure 4Each third engaging portion 302 includes a first extension 310, a second extension 320, and a third extension 330. The first extension 310 includes a first end 311 and a second end 312; the second extension 320 includes a first end 321 and a second end 322; and the third extension 330 includes a first end 331 and a second end 332. The first end 311 of the first extension 310 is connected to the inner wall body 301; the first end 321 of the second extension 320 is connected to the second end 312 of the first extension 310; and the first end 331 of the third extension 330 is connected to the second end 322 of the second extension 320.

[0066] And, as Figure 6 As shown, the angle A between the first extension 310 and the inner wall body 301 is 90°, the angle B between the second extension 320 and the first extension 310 is 90°, and the angle C between the third extension 330 and the second extension 320 is an obtuse angle. Thus, a portion of the inner wall body 301, the first extension 310, the second extension 320, and the third extension 330 together define the limiting space 303.

[0067] It should be noted that the present application does not impose special restrictions on the angles A between the first extension 310 and the inner wall body 301, B between the second extension 320 and the first extension 310, and C between the third extension 330 and the second extension 320. As long as the angle A between the first extension 310 and the inner wall body 301 is greater than 0° and less than 180°, the angle B between the second extension 320 and the first extension 310 is greater than 0° and less than 180°, and the angle between the third extension 330 and the second extension 320 is an obtuse angle, it is acceptable. For example, in some possible implementations, the angle A is 60°, 80°, 100°, or 120°, the angle B is 60°, 80°, 100°, or 120°, and the angle C is 120°, 130°, 140°, or 150°.

[0068] For example, at least a portion of the first engaging portion 210 is located within the limiting space 303 of a third engaging portion 302a, and at least a portion of the second engaging portion 220 is located within the limiting space 303 of another third engaging portion 302b. Thus, the first engaging portion 210 and the third engaging portion 302a cooperate, and the second engaging portion 220 and the third engaging portion 302b cooperate, together connecting the outer wall 200 and the inner wall 300.

[0069] Specifically, continue to refer to Figure 5 and combined Figure 4The first engaging portion 210 includes a first part 211 and a second part 212. The first part 211 includes a first end 2111 and a second end 2112, and the second part 212 includes a first end 2121 and a second end 2122. The first end 2111 of the first part 211 is connected to the first side portion 202, and the angle E between the first part 211 and the first side portion 202 is 90°. The first end 2121 of the second part 212 is connected to the second end 2112 of the first part 211, and the second end 2122 of the second part 212 faces away from the inner wall body 301. The angle F between the second part 212 and the first part 211 is 90°, meaning that the first part 211, the second part 212, and the first side portion 202 form a "U"-shaped structure. The second end 2122 of the second part 212 can abut against the second extension 320 and the third extension 330 of the third engaging portion 302a.

[0070] It should be noted that the first engaging portion 210 in this embodiment of the application has a "U" shaped structure, but it is not limited to this. In other possible implementations, the first engaging portion 210 may also have a "Z" shaped structure, that is, the first side portion 202, the first portion 211 and the second portion 212 form a "Z" shaped structure.

[0071] It should be noted that the present application does not impose special restrictions on the size of the angle E between the first part 211 and the first side part 202, and the angle F between the second part 212 and the first part 211, as long as the angle E between the first part 211 and the first side part 202 is greater than 0° and less than 180°, and the angle F between the second part 212 and the first part 211 is greater than 0° and less than 180°. For example, in some possible implementations, the angle E is 60°, 80°, 100° or 120°, etc., and the angle F is 60°, 80°, 100° or 120°, etc.

[0072] Continue to refer to Figure 6 and combined Figure 4 The second engaging portion 220 includes an abutment portion 221, which has a first end 2211 and a second end 2212. The first end 2211 of the abutment portion 221 is connected to the second side portion 203. Along the width direction X, the second end 2212 of the abutment portion 221 faces away from the second side portion 203 and the first side portion 202. The angle D between the abutment portion 221 and the second side portion 203 is 90°. That is, the abutment portion 221 and the second side portion 203 form an "L"-shaped structure. The abutment portion 221 can abut against the second end 332 of the third extension 330 of the third engaging portion 302b.

[0073] It should be noted that the included angle D between the abutment portion 221 and the second side portion 203 is not specifically limited in this embodiment, as long as the included angle D between the abutment portion 221 and the second side portion 203 is greater than 0° and less than or equal to 90°. For example, in some possible implementations, the included angle D is 40°, 50°, 60° or 80°, etc.

[0074] In this embodiment, both the outer wall 200 and the inner wall 300 are made of steel, which has elastic deformation capability. However, this embodiment does not impose special restrictions on the material of the outer wall 200 and the inner wall 300, as long as they have elastic deformation capability and meet the structural strength requirements of the security door.

[0075] refer to Figures 7 to 9 and combined Figure 4 and Figure 5 During the process of installing the outer wall 200 to the inner wall 300, the outer wall body 201 is first tilted relative to the inner wall body 301 (e.g., Figure 7 As shown), so that the second part 212 of the first engaging portion 210 can be inserted into the limiting space 303 of the third engaging portion 302a (as shown). Figure 8 (As shown). It should be noted that the third extension 330 of the third engaging portion 302a can limit the second portion 212 of the first engaging portion 210 in the width direction X, thereby preventing the second portion 212 of the first engaging portion 210 from disengaging from the limiting space 303 of the third engaging portion 302a.

[0076] refer to Figure 10 When the outer wall 200 is in the initial position, along the width direction X, the distance L1 from the second end 2212 of the abutment portion 221 to the second end 2122 of the second part 212 of the first engaging portion 210 is greater than the distance L2 from the second end 332 of the third extension portion 330 of the two third engaging portions 302 (i.e., the third engaging portions 302a and the third engaging portions 302b).

[0077] Next, continue to refer to Figure 9 and combined Figure 6 An external force T causes the second side portion 203 and the second engaging portion 220 to deform along the width direction X from their initial positions toward the first side portion 203 to the position shown by the dashed line G.

[0078] It should be noted that, in the initial position, since the distance L1 is greater than the distance L2, the second end 2212 of the abutment portion 221 of the second engaging portion 220 cannot extend into the limiting space 303 of the third engaging portion 302b.

[0079] When the second side portion 203 and the second engaging portion 220 are deformed to the position shown by the dashed line G, the distance L1 is less than the distance L2. Then, the abutment portion 221 is moved along the thickness direction Y to between the inner wall body 301 and the third extension portion 330. Then, the external force applied to the second side portion 203 is stopped, so that the second side portion 203 and the second engaging portion 220 are restored to their initial positions (i.e., the distance L1 is greater than the distance L2), thereby enabling the second end 2212 of the abutment portion 221 of the second engaging portion 220 to extend into the limiting space 303 of the third engaging portion 302b. This enables the first engaging portion 210 to engage with the third engaging portion 303a, and the second engaging portion 220 to engage with the third engaging portion 303b, so as to connect the outer wall 200 to the inner wall 300 (e.g., ...). Figure 4 (As shown).

[0080] Finally, refer to Figures 4 to 6 By adding filler material into the filling chamber 400, the door leaf 100 can be installed. The filler material will fill the entire filling chamber 400, thereby applying a force along the thickness direction Y away from the inner wall body 301 to the outer wall body 201. As a result, the second end 2122 of the second part 212 of the first engaging part 210 abuts against the second extension 320 of the third engaging part 302a (e.g., Figure 5 As shown), the second end 332 of the third extension 330 of the third engaging portion 302b abuts against the second side portion 203 (as shown). Figure 6 (as shown) or the abutment part 221, thereby making the structure of the door leaf 100 more stable.

[0081] It should be noted that the external force T in this embodiment can be applied to the second side 203 by mechanical equipment or by manual force. When applied manually to the second side 203, the thickness of the second side 203 should meet the requirement that... Figure 4 In this case, the dimension of the second side portion 203 along the width direction X is less than or equal to 1.5 mm. Preferably, the thickness of the second side portion 203 is 1.2 mm.

[0082] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A door leaf, characterized in that, include: The outer wall has a first engaging portion and a second engaging portion, which are located at both ends of the outer wall along the width direction of the door leaf; The inner wall, along the thickness direction of the door leaf, is disposed opposite to the outer wall. Along the width direction of the door leaf, each end of the inner wall has a third engaging portion. One of the two third engaging portions engages with a first engaging portion, and the other engages with a second engaging portion to connect the outer wall to the inner wall. Along the thickness direction, the inner wall and the outer wall define a filling chamber that accommodates filler. The inner wall includes an inner wall body. The outer wall includes a first side portion and a second side portion; The third engaging portion includes: a second extension portion and a third extension portion; The first engaging portion includes: The first part includes a first end and a second end, wherein the first end of the first part is connected to the first side portion; The second part includes a first end and a second end. The first end of the second part is connected to the second end of the first part. The second end of the second part faces away from the inner wall body. The second end of the second part can abut against the second extension and the third extension of the third engaging part. The angle between the first portion and the first side portion is 90°; and / or The angle between the second part and the first part is 90°; The second engaging portion includes an abutting portion, the abutting portion having a second end, the second end of the abutting portion facing away from the second side portion along the width direction; The distance from the second end of the abutting portion to the second end of the second portion of the first engaging portion is greater than the distance from the second ends of the third extensions of the two third engaging portions; The second side portion is capable of elastic deformation along the width direction.

2. The door leaf as described in claim 1, characterized in that, The outer wall includes: outer wall body; The first side portion is located at one end of the outer wall body along the width direction, and the first engaging portion is located at the end of the first side portion away from the outer wall body along the thickness direction; The second side portion is located at the other end of the outer wall body along the width direction, and the second engaging portion is located at the end of the second side portion away from the outer wall body along the thickness direction.

3. The door leaf as described in claim 2, characterized in that, The third engaging portion includes: The first extension includes a first end and a second end, the first end of the first extension is connected to the inner wall body, and the included angle between the first extension and the inner wall body is greater than 0° and less than 180°. The second extension includes a first end and a second end, the first end of the second extension is connected to the second end of the first extension, and the included angle between the first extension and the second extension is greater than 0° and less than 180°. The third extension includes a first end and a second end. The first end of the third extension is connected to the second end of the second extension. The second end of the third extension extends toward the inner wall body, and the angle between the third extension and the second extension is greater than 0° and less than 180°. The first extension, the second extension, and the third extension define a limiting space, at least a portion of the first engaging portion is located within the limiting space of one of the third engaging portions, and at least a portion of the second engaging portion is located within the limiting space of the other of the third engaging portions.

4. The door leaf as described in claim 3, characterized in that, The angle between the first extension and the inner wall body is 90°; and / or The angle between the second extension and the first extension is 90°; and / or The angle between the third extension and the second extension is greater than 90° and less than 180°.

5. The door leaf as described in claim 3 or 4, characterized in that, The The abutting portion includes a first end and a second end. The first end of the abutting portion is connected to the second side portion. The abutting portion can abut against the second end of the third extension of the third engaging portion. The angle between the abutting portion and the second side portion is greater than 0° and less than or equal to 90°.

6. The door leaf as described in claim 5, characterized in that, The angle between the abutting portion and the second side portion is 90°.

7. The door leaf as described in claim 1, characterized in that, The inner wall and the outer wall are made of steel.

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