Shell mounting structure and electric power system
By designing the mounting structure and the target mounting structure in the housing structure of the electronic equipment, the problem of the housing structure flying out of the box cover when the shell structure explodes is solved, blocking the box cover and reducing the risk of flying out and damage.
Patent Information
- Application Number
- CN202421869240.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-02
AI Technical Summary
When the housing structure of electronic devices used in some harsh environments explodes, the box cover may detach and fly out at high speed, posing a serious threat.
A housing mounting structure is designed, including a hanging structure, and the hanging structure is provided with a first connecting part and a second connecting part for connecting with the box and the target hanging structure of the housing structure. The part of the hanging structure and the target hanging structure is located on the side of the box cover that departs from the box, forming a barrier to the box cover and reducing the risk of flying out.
Through the design of the hanging structure and the target hanging structure, the separation movement of the box cover can be blocked when the inner cavity pressure of the shell structure increases, reducing the possibility of flying out of the inner parts of the shell structure and causing damage to peripheral equipment or personnel.
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Figure CN222941052U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of explosion-proof technology, and in particular to a shell installation structure and a power system. Background Art
[0002] Some electronic devices are used in harsh environments. For example, inverters are mounted on walls or columns. To prevent the internal electronic devices from being damaged by dust, rain, etc., a casing with a corresponding protection level is usually designed. In some scenarios, some electronic components in the inner cavity of the casing may release flammable gases, which mix with the air in the box to form an explosive gas mixture. Once sparks or discharges occur in the box, it is very likely to cause ignition or even explosion. The huge energy released will not only damage the equipment itself, but may also cause parts such as the box cover to detach and fly out at high speed, posing a serious threat to people or objects around it. Utility Model Content
[0003] The present disclosure aims to solve the problem of how to improve the safety performance of the shell structure when an explosion occurs in the related art to a certain extent.
[0004] In order to solve at least one aspect of the above-mentioned problems to at least a certain extent, in a first aspect, the present disclosure provides a shell mounting structure, including a hanging structure, wherein the hanging structure is provided with a first connecting portion and a second connecting portion, the first connecting portion being used to connect to a box body of the shell structure, and the second connecting portion being used to connect to a target hanging structure of the shell structure; at least a portion of at least one of the hanging structure and the target hanging structure is located on a side of a box cover of the shell structure away from the box body.
[0005] Optionally, the distribution directions of the box body and the box cover are arranged at a preset angle with the direction of gravity.
[0006] Optionally, in the distribution direction of the box body and the box cover, the first connection part and the second connection part are distributed in sequence; in the distribution direction of the box body and the box cover, the distance from the first connection part to the second connection part is greater than the distance from the box cover to the second connection part.
[0007] Optionally, at least one of the mounting structure and the target mounting structure is provided with a protective structure, and the protective structure is distributed on at least one side of the box cover in a set direction, and the distribution direction of the box body and the box cover is perpendicular to the set direction.
[0008] Optionally, the protective structure includes a first frame body arranged on the hanging structure, the set direction includes a first horizontal direction, two first frames are arranged opposite to each other in the first horizontal direction, and the first connecting portion is arranged on both of the two first frames.
[0009] Optionally, the first connecting portion is detachably connected to the box body.
[0010] Optionally, the first connecting portion includes a first connecting hole, and a columnar structure is connected to the box body; the columnar structure is inserted into the first connecting hole.
[0011] Optionally, a communication port is provided on the side wall of the first connecting hole, and the communication port is used for the columnar structure to enter or exit the first connecting hole.
[0012] Optionally, the hanging structure further includes a second frame body. The two ends of the second frame body along the first horizontal direction are respectively connected to the two first frame bodies, and a second connecting portion is formed on the second frame body; the second connecting portion is detachably connected to the target hanging structure;
[0013] And / or, the protection structure includes at least one of a third frame body and a fourth frame body; in another set direction perpendicular to the first horizontal direction, at least part of the third frame body is located on one side of the box cover, and at least part of the fourth frame body is located on the other side of the box cover.
[0014] In a second aspect, the present disclosure provides a power system, which includes an electronic device and the housing installation structure as described in any one of the first aspects above. The housing structure of the electronic device is installed on a target hanging structure through the hanging structure of the housing installation structure.
[0015] Compared with the related prior art, in the housing installation structure and the power system of the present disclosure, the first connecting portion of the hanging structure is used to connect with the box body of the housing structure, and the second connecting portion of the hanging structure is used to connect with the target hanging structure of the housing structure. The box body of the housing structure can be hung and installed on the target hanging structure through the hanging structure, realizing the hanging and installation of an electronic device such as an inverter on a target hanging structure such as a wall or a column; at the same time, at least part of at least one of the hanging structure and the target hanging structure is set to be located on the side of the box cover of the housing structure facing away from the box body, that is to say, at least part of at least one of the hanging structure and the target hanging structure is located on the movement path where the box cover moves away from the box body relative to the box body. Thus, when the pressure in the inner cavity of the housing structure increases and causes the box cover to move away from the box body towards the side away from the box body, at least part of at least one of the hanging structure and the target hanging structure can form a block for the box cover, reducing the possibility of the box cover and the components in the inner cavity of the housing structure flying out, and reducing the possibility of damage to surrounding equipment or personnel caused by the flying out of the box cover. Description of the Drawings
[0016] Figure 1Schematic three-dimensional structure diagram of the housing structure mounted to the target mounting structure through the hanging structure in the first embodiment of the present disclosure;
[0017] Figure 2 is Figure 1 Schematic structure diagram after removing the housing structure in;
[0018] Figure 3 Schematic three-dimensional structure diagram of the housing structure mounted to the target mounting structure through the hanging structure in the first embodiment of the present disclosure;
[0019] Figure 4 Schematic three-dimensional structure diagram of the housing structure mounted to the target mounting structure through the hanging structure in the third embodiment of the present disclosure;
[0020] Figure 5 is Figure 4 Schematic structure diagram after removing the housing structure in;
[0021] Figure 6 Schematic three-dimensional structure diagram of the housing structure mounted to the target mounting structure through the hanging structure in the fourth embodiment of the present disclosure.
[0022] Explanation of reference numerals:
[0023] 1 - First frame; 11 - First connecting part; 111 - First connecting hole; 112 - Communication port; 2 - Second frame; 21 - Second connecting part; 211 - Second connecting hole; 3 - Third frame; 4 - Fourth frame; 5 - Housing structure; 51 - Box body; 511 - Columnar structure; 52 - Box cover; 6 - Target mounting structure. Detailed implementation manners
[0024] To make the above objects, features, and advantages of the present disclosure more obvious and understandable, the following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings.
[0025] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.
[0026] In the description of this specification, the descriptions with reference to terms such as "embodiment", "one embodiment", "some embodiments", "exemplarily", and "one embodiment" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or embodiment are included in at least one embodiment or embodiment of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or embodiments.
[0027] The terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one of such features.
[0028] In the drawings, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction pointed by the arrow of the Z-axis) represents up, and the negative direction of the Z-axis represents down; the X-axis in the drawings represents the front and back position, and the positive direction of the X-axis (that is, the direction pointed by the arrow of the X-axis) represents the front side, and the negative direction of the X-axis represents the back side; the Y-axis in the drawings represents the horizontal direction and is specified as the left and right position, and the positive direction of the Y-axis (that is, the direction pointed by the arrow of the Y-axis) represents the right side, and the negative direction of the Y-axis represents the left side; at the same time, it should be noted that the above-mentioned meanings represented by the Z-axis, Y-axis, and X-axis are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present disclosure.
[0029] As Figure 1 、 2 shown, in a first aspect, the present disclosure provides a housing mounting structure, including a hanging structure. The hanging structure is provided with a first connecting portion 11 and a second connecting portion 21. The first connecting portion 11 is used to connect with the box body 51 of the housing structure 5, and the second connecting portion 21 is used to connect with the target hanging structure 6 of the housing structure 5;
[0030] When the housing structure 5 is mounted to the target hanging structure 6 through the hanging structure, at least part of at least one of the hanging structure and the target hanging structure 6 is located on the side of the box cover 52 of the housing structure 5 away from the box body 51.
[0031] Specifically, the housing structure 5 is usually the outer shell part of an electrical device, and the electrical device can be a device with certain explosion-proof requirements, such as a power device like an inverter.
[0032] The housing structure 5 includes a box body 51 and a box cover 52. The box body 51 and the box cover 52 enclose an inner cavity, which is used to install the main part of the electrical equipment. Among them, the box body 51 usually serves as the main carrier of the electrical equipment. The total weight of the box body 51 and the components installed thereon is greater than the total weight of the box cover 52 and the components installed thereon. The box cover 52 is used in cooperation with the box body 51 to jointly form a relatively enclosed inner cavity space. The box body 51 and the box cover 52 are usually configured such that when the pressure in the inner cavity of the housing structure 5 reaches a preset pressure, the two are partially or completely separated to achieve pressure relief. Usually, the box body 51 is fixed and the box cover 52 is separated to achieve pressure relief.
[0033] It should be understood that in some scenarios, the box body 51 and the box cover 52 of the housing structure 5 may include accessories connected to their shell bodies, such as reinforcing plates, etc., which will not be elaborated here.
[0034] The target hanging structure 6 is also the target hanging position of the housing structure 5. When using the electronic device, the electronic device needs to be hung on the target mounting structure.
[0035] Such as Figure 1 and Figure 2 As shown, it shows the situation where both the hanging structure and the target hanging structure 6 are located on the side of the box cover 52 of the housing structure 5 that is away from the box body 51. The hanging structure and the target hanging structure 6 can block the movement of the box cover 52 to prevent it from flying out.
[0036] Such as Figure 3 As shown, it shows the situation where only the target hanging structure 6 is located on the side of the box cover 52 that is away from the box body 51. The target hanging structure 6 can block the movement of the box cover 52 to prevent it from flying out.
[0037] Of course, in another way, it is also possible that only the hanging structure blocks the movement of the box cover 52. This solution is not shown in the figure and will not be elaborated here.
[0038] In this embodiment, the first connection portion 11 of the mounting structure is used to connect with the box body 51 of the shell structure 5, and the second connection portion 21 of the mounting structure is used to connect with the target mounting structure 6 of the shell structure 5. The mounting structure can be used to mount the box body 51 of the shell structure 5 on the target mounting structure 6, so as to mount the electronic device such as the inverter on the target mounting structure 6 such as the wall and the column. At the same time, at least a part of at least one of the mounting structure and the target mounting structure 6 is set to be located on the side of the box cover 52 of the shell structure 5 away from the box body 51, that is, At least a portion of at least one of the mounting structure and the target mounting structure 6 is located on a movement path of the box cover 52 relative to the box body 51 and separated from the box body 51. Thus, when the box cover 52 moves toward the side away from the box body 51 and separates from the box body 51 due to an increase in pressure in the inner cavity of the shell structure 5, the box cover 52 can be blocked by at least a portion of at least one of the mounting structure and the target mounting structure 6, thereby reducing the possibility of the box cover 52 and components in the inner cavity of the shell structure 5 flying out, and reducing the possibility of damage to peripheral equipment or personnel caused by the box cover 52 flying out.
[0039] It should be understood that the distribution direction of the box body 51 and the box cover 52 is not limited, as long as the positions of the mounting structure and the target mounting structure 6 are set so that at least a part of at least one of them can block the movement of the box cover 52 away from the box body 51. In this way, when the internal pressure of the shell structure 5 is relatively high, the possibility of damage to surrounding equipment or personnel caused by the box cover 52 flying out can be reduced.
[0040] like Figure 1 and Figure 2 As shown, optionally, the distribution direction of the box body 51 and the box cover 52 is set at a preset angle with the gravity direction.
[0041] Exemplarily, the box body 51 and the box cover 52 are sequentially distributed along the X-axis direction in the figure, that is, the front-to-back direction, the box body 51 forms a receiving cavity with an open opening, the box cover 52 is set at the open opening of the box body 51, and the box body 51 and the box cover 52 together form the inner cavity of the shell structure 5. The connection method of the box body 51 and the box cover 52 is not limited, for example, the connection method of the two can be determined according to the specific explosion-proof requirements, and the two can be connected by screw connection, clamping and other connection methods.
[0042] When the distribution direction of the box body 51 and the box cover 52 is set at a preset angle to the direction of gravity, for example, at a right angle, the large surface of the shell structure 5 is arranged relative to the vertical surface of the target mounting structure 6, thereby utilizing the position arrangement of the shell structure 5. In particular, it is beneficial to reduce the space occupation requirement of the shell structure 5 in the horizontal plane and improve the compactness of the spatial arrangement when the electronic equipment is mounted on the target mounting structure 6.
[0043] like Figure 1 andFigure 2 As shown, optionally, in the distribution direction of the box body 51 and the box cover 52, the first connection part 11 and the second connection part 21 are distributed sequentially; in the distribution direction of the box body 51 and the box cover 52, the distance from the first connection part 11 to the second connection part 21 is greater than the distance from the box cover 52 to the second connection part 21.
[0044] The following description will be made by taking the distribution of the box body 51 and the box cover 52 along the X-axis direction as an example, and the first connection part 11, such as the limit groove described later, is equivalent to the first connection point, and the second connection part 21 has a part that can be equivalent to the second connection point, and the second connection point is located at the second connection part 21, such as the part where the first plate described later fits the vertical surface of the target mounting structure 6. In this case, along the X-axis direction, the box cover 52 is located at the front side of the box body 51, and the second connection part 21 is located at the front side of the first connection part 11, such as the limit groove, and the distance between the first connection point and the second connection point along the X-axis direction is greater than the distance between the box cover 52 and the second connection point along the X-axis direction.
[0045] In this embodiment, this arrangement can utilize the portion of the mounting structure and / or the target mounting structure 6 corresponding to the second connection portion 21 to form a block for the box cover 52 on the side of the box cover 52 away from the box body 51, so as to prevent the box cover 52 from flying out. There is no need to separately set up a corresponding blocking structure to block the box cover 52. For example, in another solution, the box cover 52, the box body 51 and the target mounting structure 6 are arranged in sequence from back to front. In this case, the mounting structure or the target mounting structure 6 needs to be equipped with a blocking structure separately, and the blocking structure is set at the rear side of the box cover 52 to block the box cover 52.
[0046] like Figures 1 to 3 As shown, optionally, at least one of the mounting structure and the target mounting structure 6 is provided with a protective structure, and the protective structure is distributed on at least one side of the box cover 52 in a set direction, and the distribution direction of the box body 51 and the box cover 52 is perpendicular to the set direction.
[0047] Specifically, the set direction is a direction perpendicular to the X-axis, for example, the set direction may be a left-right direction, or an up-down direction. It should be understood that the set direction may be one or more directions, which will be described in detail later. The vertical here may be approximately vertical, and the distribution direction of the box body 51 and the box cover 52 may be understood as the opening direction of the opening of the box body 51, and the angle between the opening direction and the set direction is a right angle, but may have a small deviation, for example, a deviation of 0-10°.
[0048] In this embodiment, a protective structure is provided on one or both sides of the box cover 52 along a set direction, so as to form protection for the box cover 52 in the set direction. Specifically, it forms a movement block for the box cover 52 in the set direction to prevent the box cover 52 from moving excessively in this set direction, which can improve the protection performance of the box cover 52 when the housing structure 5 explodes and reduce the possibility of the components inside the box cover 52 and the housing structure 5 flying out and causing damage to surrounding equipment or personnel.
[0049] As Figure 1 , 2 shown, optionally, the protective structure includes a first frame body 1 provided on the hanging structure. The set direction includes a first horizontal direction, and two first frame bodies 1 are arranged opposite to each other in the first horizontal direction. First connection parts 11 are provided on both first frame bodies 1.
[0050] Specifically, the first horizontal direction is the left-right direction in the figure. The space between the two first frame bodies 1 in the left-right direction can be used to arrange the housing structure 5. The housing structure 5 can be installed by using the first connection parts 11 on the two first frame bodies 1 on the left and right. Its structure is simple and practical.
[0051] Optionally, the first connection part 11 is detachably connected to the box body 51.
[0052] It should be understood that the detachable connection method between the two is not limited. By disassembling the two, the housing structure 5 can be separated from the hanging structure to meet the disassembly, installation and maintenance requirements of the housing structure 5.
[0053] As Figure 1 , 2 shown, optionally, the first connection part 11 includes a first connection hole 111, and a columnar structure 511 is connected to the box body 51; the columnar structure 511 is inserted into the first connection hole 111.
[0054] In this way, the first frame body 1 forms a support for the columnar structure 511 at the bottom of the first connection hole 111, so that the hanging structure can support the housing structure 5.
[0055] As Figure 1 , 2 shown, optionally, a communication port 112 is provided on the side wall of the first connection hole 111, and the communication port 112 is used for the columnar structure 511 to enter or exit the first connection hole 111.
[0056] As Figure 1 and Figure 2As shown, exemplarily, the communication port 112 is disposed on the top sidewall of the first connection hole 111. Thus, when the second connection portion 21 of the hanging structure is connected to the target hanging structure 6, the columnar structure 511 on the housing structure 5 of the electronic device can be inserted into the first connection hole 111 from top to bottom through the communication port 112, realizing the hanging of the electronic device. The structure is simple and facilitates the disassembly of the housing structure 5.
[0057] Furthermore, the first frame body 1 can be provided with a clamping portion at the first connection hole 111 to clamp the columnar structure 511 through the clamping portion, thereby further reducing the possibility of the columnar structure 511 disengaging from the first connection hole 111 through the communication port 112. For example, the first connection hole 111 is designed with a reduced diameter at the communication port 112 through, for example, bumps, so as to realize the clamping of the columnar structure 511.
[0058] Of course, it should be understood that in other embodiments, the columnar structure 511 can be a stud, and the stud passes through the first connection hole 111 and is threadedly connected to the box body 51.
[0059] As Figure 2 shown, in the above embodiment, optionally, the hanging structure further includes a second frame body 2. The two ends of the second frame body 2 along the first horizontal direction are respectively connected to the two first frame bodies 1, and a second connection portion 21 is formed on the second frame body 2.
[0060] Exemplarily, the two ends of the second frame body 2 along the left - right direction are respectively connected to the first frame bodies 1. The first frame body 1 and the second frame body 2 can both be plate - like structures, and they can be integrally formed. At least one of the first frame body 1 and the second frame body 2 can be provided with structures such as reinforcing rib plates.
[0061] The second connection portion 21 can be detachably connected to the target hanging structure 6. The second connection portion 21 can include a second connection hole 211, and a fastener passes through the second connection hole 211 and is connected to the target hanging structure 6, which will not be elaborated here.
[0062] The protection structure includes at least one of a third frame body 3 and a fourth frame body 4;
[0063] In another set direction perpendicular to the first horizontal direction, at least a part of the third frame body 3 is located on one side of the box cover 52, and at least a part of the fourth frame body 4 is located on the other side of the box cover 52.
[0064] As Figure 4 、 5 shown, it shows the situation where the third frame body 3 is integrally connected to the second frame body 2 and at least a part of the third frame body 3 is located below the box cover 52. In this case, the third frame body 3 can protect the box cover 52 from below, reducing the possibility of the box cover 52 and the components inside the housing structure 5 moving downward and falling.
[0065] As shown Figure 6 in the figure, it shows a situation where at least a part of the fourth frame body 4 is located above the box cover 52. In this case, the fourth frame body 4 can protect the box cover 52 from above, reducing the possibility that the box cover 52 and the components inside the housing structure 5 move upward and fly out.
[0066] It should be understood that the fourth frame body 4 may also include a part that protects the box cover 52 in the left - right direction. The fourth frame body 4 may be spaced apart from the first frame body 1, and the first frame body 1, the second frame body 2, the third frame body 3, and the fourth frame body 4 may also be integrally connected.
[0067] In this way, through the arrangement of the third frame body 3 and the fourth frame body 4, a relatively comprehensive protection for the box cover 52 can be formed, with a simple structure and strong practicability.
[0068] In a second aspect, an embodiment of the present disclosure provides a power system, which includes an electronic device and a housing mounting structure as in the above - mentioned embodiment. The housing structure 5 of the electronic device is mounted to a target hanging structure 6 through the housing mounting structure. The target hanging structure 6 may be a wall structure, a column structure, etc. The power system may be a photovoltaic system, an inverter system, etc.
[0069] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present disclosure.
Claims
1. A housing installation structure, characterized in that: The invention comprises a hanging structure, wherein the hanging structure is provided with a first connecting portion (11) and a second connecting portion (21), wherein the first connecting portion (11) is used to connect to a box body (51) of a shell structure (5), and the second connecting portion (21) is used to connect to a target hanging structure (6) of the shell structure (5); at least a portion of at least one of the hanging structure and the target hanging structure (6) is located on a side of a box cover (52) of the shell structure (5) away from the box body (51).
2. The housing installation structure according to claim 1, characterized in that: The distribution directions of the box body (51) and the box cover (52) are arranged at a preset angle with the gravity direction.
3. The housing installation structure according to claim 1, characterized in that: In the distribution direction of the box body (51) and the box cover (52), the first connection portion (11) and the second connection portion (21) are distributed in sequence; in the distribution direction of the box body (51) and the box cover (52), the distance from the first connection portion (11) to the second connection portion (21) is greater than the distance from the box cover (52) to the second connection portion (21).
4. The housing installation structure according to any one of claims 1 to 3, characterized in that: At least one of the mounting structure and the target mounting structure (6) is provided with a protective structure, the protective structure being distributed on at least one side of the box cover (52) in a set direction, and the distribution direction of the box body (51) and the box cover (52) being perpendicular to the set direction.
5. The housing installation structure according to claim 4, characterized in that: The protective structure comprises a first frame (1) arranged on the hanging structure, the set direction comprises a first horizontal direction, two first frames (1) are arranged opposite to each other in the first horizontal direction, and the first connecting portion (11) is arranged on both of the two first frames (1).
6. The housing installation structure according to claim 5, characterized in that: The first connecting portion (11) is detachably connected to the box body (51).
7. The housing installation structure according to claim 6, characterized in that: The first connection portion (11) comprises a first connection hole (111); a columnar structure (511) is connected to the box body (51); and the columnar structure (511) is inserted into the first connection hole (111).
8. The housing installation structure according to claim 7, characterized in that: A communication opening (112) is provided on a side wall of the first connection hole (111), and the communication opening (112) is used for the columnar structure (511) to enter the first connection hole (111) or to escape from the first connection hole (111).
9. The housing installation structure according to claim 5, characterized in that: The hanging structure is further provided with a second frame (2), the two ends of the second frame (2) along the first horizontal direction are respectively connected to the two first frames (1), and the second frame (2) is formed with a second connecting portion (21); the second connecting portion (21) is detachably connected to the target hanging structure (6); And / or, the protective structure includes at least one of a third frame (3) and a fourth frame (4); in another set direction perpendicular to the first horizontal direction, at least a portion of the third frame (3) is located on one side of the box cover (52), and at least a portion of the fourth frame (4) is located on the other side of the box cover (52).
10. A power system, characterized in that: It comprises an electronic device and a shell mounting structure as claimed in any one of claims 1 to 9, wherein the shell structure (5) of the electronic device is mounted to a target mounting structure (6) via a mounting structure of the shell mounting structure.