Network equipment
By setting a sealing structure on the inner wall of the network device's outer casing and the edge of the inner cover plate, a zero-gap sealing connection is achieved, solving the problems of complex waterproof performance and high cost in the prior art, simplifying the structure and optimizing the appearance.
Patent Information
- Application Number
- CN202423194680.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing technologies, the waterproof performance design of outdoor network equipment is complex, which increases manufacturing costs and affects the appearance.
A first sealing structure arranged circumferentially is provided on the inner wall of the network device's housing, and a second sealing structure arranged circumferentially is provided on the edge of the inner cover plate. The sealing connection between the inner cover plate and the housing is achieved through the zero-clearance fitting sealing structure, and the sealing structure of the housing is detachably connected through the outer cover plate, which simplifies the design and reduces the manufacturing cost.
While simplifying the structure, it improved waterproof and dustproof performance, optimized the appearance design of network equipment, and reduced manufacturing costs.
Smart Images

Figure CN223584287U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of network equipment technology, and in particular to a network equipment. Background Technology
[0002] Currently, some network devices are installed outdoors. Outdoor network devices need to meet high waterproof and dustproof requirements, especially network devices in extreme environments (-30℃ to -80℃), where the waterproof performance requirements are extremely stringent.
[0003] To achieve waterproofing for outdoor network equipment, existing technologies typically involve installing waterproof cable structures on the exterior of the device or designing waterproof network connectors. However, these designs are complex, increasing manufacturing costs and affecting the device's appearance. Utility Model Content
[0004] The purpose of this utility model is to provide a network device that simplifies the structure of the network device, improves its waterproof and dustproof performance, reduces manufacturing costs, and optimizes the appearance of the network device.
[0005] To address the aforementioned technical problems, embodiments of this utility model provide a network device, comprising:
[0006] An outer shell, forming a receiving space, the outer shell having an opening communicating with the receiving space, the inner wall of the outer shell having a circumferentially extending protrusion, the protrusion being provided with a first sealing structure arranged circumferentially along the outer shell; an inner cover plate, located in the receiving space, the inner cover plate having a second sealing structure arranged circumferentially along its edge, the second sealing structure being in zero-clearance fit with the first sealing structure to seal the inner cover plate and the outer shell; an outer cover plate, detachably connected to the outer shell and covering the opening.
[0007] Compared to existing technologies, this embodiment of the invention features a first circumferentially arranged sealing structure on the inner wall of the outer casing, and a second circumferentially arranged sealing structure on the edge of the inner cover plate located within the casing. The first and second sealing structures engage with zero clearance, allowing for a sealed connection between the inner cover plate and the outer casing. The outer cover plate is detachably connected to the outer casing and seals the opening of the outer casing, surrounding the inner cover plate. Thus, within the casing of the network device, the zero-clearance engagement of the two sealing structures achieves waterproofing and dustproofing. This design is simple, reduces manufacturing costs, and the internal waterproof and dustproof structure optimizes the appearance of the network device.
[0008] Optionally, the first sealing structure is an annular groove with an opening facing the inner cover plate, and the second sealing structure is an annular protrusion extending towards the protrusion. The contour and size of the annular groove match the contour and size of the annular protrusion, and the annular protrusion is embedded in the annular groove to achieve a zero-clearance fit.
[0009] Optionally, at least one inner sidewall of the annular groove is provided with a plurality of first step structures, and in the direction from the inner cover plate to the outer cover plate, the size of each first step structure is smaller than the size of the previous first step structure, so that the internal space of the annular groove gradually increases; at least one sidewall of the annular protrusion is provided with a plurality of second step structures, and in the direction from the inner cover plate to the outer cover plate, the size of each second step structure is larger than the size of the previous second step structure, so that the size of the annular protrusion gradually increases.
[0010] Optionally, at least one inner wall of the annular groove is inclined, and in the direction from the inner cover plate to the outer cover plate, the inner wall is inclined in a direction away from the other inner wall, so that the internal space of the annular groove gradually increases; at least one side wall of the annular protrusion is inclined, and in the direction from the inner cover plate to the outer cover plate, the side wall is inclined in a direction away from the other side wall, so that the size of the annular protrusion gradually increases.
[0011] Optionally, the first sealing structure is an annular protrusion extending toward the protrusion, and the second sealing structure is an annular groove with an opening toward the inner cover plate. The outline and size of the annular protrusion match the outline and size of the annular groove, and the annular protrusion is embedded in the annular groove to achieve a zero-clearance fit.
[0012] Optionally, at least one sidewall of the annular protrusion is provided with a plurality of first step structures, and in the direction from the inner cover plate to the outer cover plate, the size of each first step structure is smaller than the size of the previous first step structure, so that the size of the annular protrusion gradually decreases; at least one sidewall of the annular groove is provided with a plurality of second step structures, and in the direction from the inner cover plate to the outer cover plate, the size of each second step structure is larger than the size of the previous second step structure, so that the internal space of the annular groove gradually decreases.
[0013] Optionally, at least one sidewall of the annular protrusion is inclined, and in the direction from the inner cover plate to the outer cover plate, the sidewall is inclined toward the direction closer to another sidewall, so that the size of the annular protrusion gradually decreases; at least one inner sidewall of the annular groove is inclined, and in the direction from the inner cover plate to the outer cover plate, the inner sidewall is inclined away from the direction away from another sidewall, so that the internal space of the annular groove gradually decreases.
[0014] Optionally, the annular groove includes an inner annular groove and an outer annular groove, the inner annular groove and the outer annular groove are spaced apart, and the outer annular groove is located around the inner annular groove; the annular protrusion includes an inner annular protrusion and an outer annular protrusion, the inner annular protrusion and the outer annular protrusion are spaced apart, and the outer annular protrusion is located around the inner annular protrusion; the inner annular protrusion and the inner annular groove are in zero-clearance fit, and the outer annular protrusion and the outer annular groove are in zero-clearance fit.
[0015] Optionally, it also includes a sealing cover fixed to the inner cover plate and located between the inner cover plate and the outer cover plate. The sealing cover has a wire hole, and a sealing ring is provided on the inner edge of the wire hole. The inner cover plate has a network interface facing the wire hole, and the outer cover plate has a wire outlet facing the wire hole. The wire outlet is used to avoid external cables. The network interface is used to connect to external cables. The sealing ring is used to press-fit with the external cables to achieve a seal.
[0016] Optionally, it also includes a fastener disposed inside the housing and adjacent to the opening, wherein when the outer cover plate is connected to the housing and covers the opening, the outer cover plate is detachably fixed to the fastener. Attached Figure Description
[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0018] Figure 1 This is a schematic diagram of the structure of a network device according to an embodiment of the present invention;
[0019] Figure 2 This is a schematic diagram of the structure of the sealing cover of the network device according to an embodiment of the present invention;
[0020] Figure 3 yes Figure 1 A top-down view of network equipment;
[0021] Figure 4 yes Figure 3 Sectional view along line AA';
[0022] Figure 5 yes Figure 4 Enlarged view of region A in the middle;
[0023] Figure 6 This is an exploded view of the network device according to an embodiment of the present invention;
[0024] Figure 7 This is a schematic diagram of the structure of the slide and mounting component of the network device according to an embodiment of the present utility model. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.
[0026] In this embodiment of the invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.
[0027] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0028] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0029] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0030] Outdoor network equipment, such as Customer Premises Equipment (CPE), is located at the end-user's premises and receives mobile signals, then forwards these signals via Wi-Fi. Existing outdoor CPE equipment has a complex waterproof and dustproof structure, primarily achieved by using silicone seals between external plastic parts. This increases the number of molds and parts required for these seals, thus raising manufacturing costs.
[0031] To address the aforementioned technical problems, one embodiment of this utility model provides a network device. Compared to existing technologies, this network device features a circumferentially arranged first sealing structure on the inner wall of the outer casing and a circumferentially arranged second sealing structure on the edge of an inner cover plate located within the casing. The first and second sealing structures engage with zero clearance, allowing for a sealed connection between the inner cover plate and the outer casing. The outer cover plate is detachably connected to the outer casing and seals the opening of the outer casing, surrounding the inner cover plate. Thus, within the casing of the network device, the zero-clearance engagement of the two sealing structures achieves waterproofing and dustproofing. This design is simple, reduces manufacturing costs, and the internal waterproof and dustproof structure optimizes the device's appearance.
[0032] The implementation details of the network device in this embodiment are described below. The following content is only for the convenience of understanding and is not necessary for implementing this solution.
[0033] See Figures 1 to 5 The network device 100 of this embodiment includes: a housing 110, an inner cover 120, and an outer cover 130. The housing 110 forms a receiving space S and has an opening 111 communicating with the receiving space S. The inner wall of the housing 110 has a circumferentially extending protrusion 112, and the protrusion 112 is provided with a first sealing structure arranged circumferentially along the housing 110. The inner cover 120 is located in the receiving space S, and the inner cover 120 is provided with a second sealing structure arranged circumferentially along its edge. The second sealing structure is in zero-clearance fit with the first sealing structure to seal the inner cover 120 and the housing 110. The outer cover 130 is detachably connected to the housing 110 and covers the opening 111.
[0034] It is understood that the protrusion 112 protrudes relative to the inner wall of the outer shell 110, forming a stepped structure. The first sealing structure is provided on the stepped structure, and the second sealing structure is provided correspondingly to the first sealing structure. After the inner cover plate 120 is inserted into the inner shell 110, the second sealing structure and the first sealing structure are fitted with zero clearance.
[0035] With this configuration, the network device 100 is waterproof and dustproof through the zero-gap fit of two sealed structures inside the housing 110. The design is simple and can reduce manufacturing costs. Moreover, the waterproof and dustproof structure is inside the network device 100, which can optimize the appearance of the network device 100.
[0036] See Figure 5 and Figure 7 In one embodiment, the first sealing structure is an annular groove 113 with its opening facing the inner cover plate 120, and the second sealing structure is an annular protrusion 121 extending towards the protrusion 112. The contour and size of the annular groove 113 match the contour and size of the annular protrusion 121, and the annular protrusion 121 is embedded in the annular groove 113 to achieve a zero-clearance fit. Specifically, the annular groove 113 is provided along the protrusion 112, and the annular protrusion 121 is provided along the edge of the inner cover plate 120. When the inner cover plate 120 is assembled into the outer shell 110, the annular protrusion 121 is embedded in the annular groove 113, and the outer wall of the annular protrusion 121 is tightly fitted to the inner wall of the annular groove 113 to achieve a zero-clearance fit, thereby achieving IP65 waterproof and dustproof performance.
[0037] At least one inner wall of the annular groove 113 is provided with a plurality of first step structures. In the direction from the inner cover plate 120 to the outer cover plate 130, the size of each first step structure is smaller than the size of the previous first step structure, so that the internal space of the annular groove 113 gradually increases. That is, the cross-sectional shape of the annular groove 113 perpendicular to its extension direction is stepped, forming a stepped groove.
[0038] Correspondingly, at least one sidewall of the annular protrusion 121 is provided with multiple second step structures. In the direction from the inner cover plate 120 to the outer cover plate 130, the size of each second step structure is larger than the size of the previous second step structure, so that the size of the annular protrusion 121 gradually increases. The cross-sectional shape of the annular protrusion 121 perpendicular to its extension direction is also stepped, forming a stepped protrusion. The outer contour of the stepped protrusion matches the contour of the stepped groove. By setting the annular groove 113 as a stepped groove and the annular protrusion 121 as a stepped protrusion, the contact path between the annular groove 113 and the annular protrusion 121 can be extended, further reducing the possibility of external water, dust and other substances entering the interior of the network device 100, and improving the waterproof and dustproof performance of the network device 100.
[0039] In other embodiments, at least one inner wall of the annular groove 113 is inclined, and in the direction from the inner cover plate 120 to the outer cover plate 130, the inner wall is inclined away from the other inner wall, so that the internal space of the annular groove 113 gradually increases. In other words, the cross-sectional profile of the annular groove 113 perpendicular to its extension direction is trapezoidal, forming a trapezoidal groove.
[0040] Correspondingly, at least one sidewall of the annular protrusion 121 is inclined, and in the direction from the inner cover plate 120 to the outer cover plate 130, the sidewall is inclined away from the other sidewall, so that the size of the annular protrusion 121 gradually increases. That is, the cross-sectional profile of the annular protrusion 121 perpendicular to its extension direction is also trapezoidal, forming a trapezoidal protrusion that matches the trapezoidal groove. This arrangement can extend the contact path between the annular groove 113 and the annular protrusion 121, further reducing the possibility of external water, dust and other substances entering the interior of the network device 100, and improving the waterproof and dustproof performance of the network device 100.
[0041] In one embodiment, the annular groove 113 includes an inner annular groove (not shown) and an outer annular groove (not shown), the inner and outer annular grooves being spaced apart, and the outer annular groove being located around the inner annular groove. In other words, there are multiple annular grooves 113, including one inner annular groove and at least one outer annular groove, with each outer annular groove surrounding the outer periphery of the inner annular groove.
[0042] Correspondingly, the annular protrusion 121 includes an inner annular protrusion (not shown) and an outer annular protrusion (not shown), which are spaced apart, with the outer annular protrusion located around the inner annular protrusion. The inner annular protrusion and the inner annular groove are in zero-clearance fit, and the outer annular protrusion and the outer annular groove are in zero-clearance fit.
[0043] By increasing the number of annular protrusions 121 and annular grooves 113, the zero-clearance mating area and travel distance between the inner wall of the outer casing 110 and the inner cover plate 120 can be increased, further improving the waterproof and dustproof performance of the network device 100.
[0044] Understandably, increasing the number of annular protrusions 121 and annular grooves 113 requires increasing the thickness of the outer shell 110, or more specifically, increasing the thickness of the protrusions 112.
[0045] In other embodiments, the annular protrusion 121 may also be provided on the protrusion 112, and the annular groove 113 may be provided on the inner cover plate 120. The specific arrangement of the annular protrusion 121 and the annular groove 113 in these embodiments can be referred to the foregoing description, and will not be repeated here.
[0046] It should be noted that the network device 100 also includes a motherboard 140, which is fixed inside the housing 110. When the inner cover 120 is inserted into the housing 110, the housing 110 and the inner cover 120 together surround the motherboard 140 within the accommodating space S. After the inner cover 120 is in zero-clearance fit with the housing 110, it is also fixed to the motherboard 140 with screws to position the inner cover 120 and maintain a zero-clearance fit between the inner cover 120 and the housing 110.
[0047] In one embodiment, the network device 100 further includes a sealing cover 150 fixed to the inner cover 120 and located between the inner cover 120 and the outer cover 130. The sealing cover 150 has a wire-through hole 151, and a sealing ring 152 is provided on the inner edge of the wire-through hole 151. The inner cover 120 has a network interface facing the wire-through hole 151, and the outer cover 130 has a wire-out hole 131 facing the wire-through hole 151. The wire-out hole 131 is used to avoid external cables 200, the network interface is used to connect to the external cables 200, and the sealing ring 152 is used to press-fit with the external cables 200 to achieve a seal.
[0048] The sealing cover 150 is fixed to the inner cover plate 120 on the side opposite to the main board 140. The sealing cover 150 is used to tightly fit with the external cable 200 along the extension path of the external cable 200 to achieve a sealing function. For example, the sealing cover 150 can be fixed to the inner cover plate 120 by screws, and the sealing ring 152 can be a foam ring, a silicone ring, or a rubber ring.
[0049] In some embodiments, the outer cover plate 130 can be fixed to the inner cover plate 120 at both ends by screws. Due to the force at both ends, the middle part of the outer cover plate 130 may bend away from the outer casing 110, forming a gap at the connection between the outer casing 110 and the outer cover plate 130, resulting in reduced sealing performance. Therefore, a fastener 160 can be provided inside the outer casing 110. More specifically, the fastener 160 is provided on the side of the sealing cover 150 away from the inner cover plate 120, and a connecting structure (not shown) is provided on the side of the outer cover plate 130 facing the fastener 160. When the outer cover plate 130 is connected to the outer casing 110, the connecting structure of the outer cover plate 130 can be detachably connected to the fastener 160, so that the outer cover plate 130 and the outer casing 110 are tightly connected. The connection structure and the fastener 160 can be a snap-fit, plug-in, or other detachable connection method.
[0050] The outer casing 110 may have a first positioning recess 114 and a first positioning flange 115 at the edge where it connects with the outer cover plate 130, while the outer cover plate 130 may have a second positioning recess 132 and a second positioning flange 133 at the edge where it connects with the outer casing 110. When the outer casing 110 and the outer cover plate 130 are assembled, the first positioning flange 115 is inserted into the second positioning recess 132 and they cooperate with each other, and the second positioning flange 133 is inserted into the first positioning recess 114 and they cooperate with each other. In this way, the positioning fit between the outer casing 110 and the outer cover plate 130 can be achieved, and the sealing performance of the connection position between the outer casing 110 and the outer cover plate 130 can also be improved.
[0051] In one embodiment, the outer edge portion of the outer casing 110 forming the opening 111 can be removed, leaving the inner edge portion to form the first positioning recess 114 and the first positioning flange 115. Then, the inner edge portion of the outer cover plate 130 can be removed, leaving the outer edge portion to form the second positioning recess 132 and the second positioning flange 133. Alternatively, the inner edge portion of the outer casing 110 forming the opening 111 can be removed, leaving the outer edge portion to form the first positioning recess 114 and the first positioning flange 115. Then, the outer edge portion of the outer cover plate 130 can be removed, leaving the inner edge portion to form the second positioning recess 132 and the second positioning flange 133.
[0052] In one embodiment, the inner wall of the housing 110 is provided with a groove 116, and the outer edge of the motherboard 140 is provided with a mounting member 141. When assembling the motherboard 140, the mounting member 141 is aligned with the groove 116, and the motherboard 140 is installed into the housing 110, which can achieve quick and accurate assembly. Preferably, there are two grooves 116, which are arranged opposite to each other, and there are also two mounting members 141, which are located on opposite sides of the motherboard 140. During installation, the mounting members 141 extend into the grooves 116 one by one.
[0053] It is understood that the different implementation methods described above in this embodiment can be set independently or combined arbitrarily as needed, provided that they are compatible with each other. This will not be elaborated here.
[0054] The network device provided by the embodiments of this utility model has been described in detail above. Specific examples have been used in this document to illustrate the principle and implementation of this utility model. The above description of the embodiments is only for the purpose of helping to understand the idea of this utility model. There may be changes in the specific implementation and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A network device, characterized in that, include: The outer shell encloses a receiving space, the outer shell has an opening communicating with the receiving space, and the inner wall of the outer shell has a circumferentially extending protrusion, the protrusion being provided with a first sealing structure arranged circumferentially along the outer shell; An inner cover plate is located in the receiving space. The inner cover plate has a second sealing structure arranged circumferentially along its edge. The second sealing structure is fitted with the first sealing structure with zero clearance so that the inner cover plate and the outer shell are sealed together. An outer cover plate is detachably connected to the outer casing and covers the opening.
2. The network device according to claim 1, characterized in that, The first sealing structure is an annular groove with an opening facing the inner cover plate, and the second sealing structure is an annular protrusion extending towards the protrusion. The outline and size of the annular groove match the outline and size of the annular protrusion, and the annular protrusion is embedded in the annular groove to achieve a zero-clearance fit.
3. The network device according to claim 2, characterized in that, At least one inner wall of the annular groove is provided with a plurality of first step structures. In the direction from the inner cover plate to the outer cover plate, the size of each first step structure is smaller than the size of the previous first step structure, so that the internal space of the annular groove gradually increases. At least one sidewall of the annular protrusion is provided with a plurality of second step structures. In the direction from the inner cover plate to the outer cover plate, the size of each second step structure is larger than the size of the previous second step structure, so that the size of the annular protrusion gradually increases.
4. The network device according to claim 2, characterized in that, At least one inner wall of the annular groove is inclined, and in the direction from the inner cover plate to the outer cover plate, the inner wall is inclined in a direction away from the other inner wall, so that the internal space of the annular groove gradually increases. At least one sidewall of the annular protrusion is inclined in the direction from the inner cover plate to the outer cover plate, and the sidewall is inclined away from the other sidewall, so that the size of the annular protrusion gradually increases.
5. The network device according to claim 1, characterized in that, The first sealing structure is an annular protrusion extending toward the protrusion, and the second sealing structure is an annular groove with an opening toward the inner cover plate. The outline and size of the annular protrusion match the outline and size of the annular groove, and the annular protrusion is embedded in the annular groove to achieve a zero-clearance fit.
6. The network device according to claim 5, characterized in that, At least one sidewall of the annular protrusion is provided with a plurality of first step structures. In the direction from the inner cover plate to the outer cover plate, the size of each first step structure is smaller than the size of the previous first step structure, so that the size of the annular protrusion gradually decreases. At least one sidewall of the annular groove is provided with a plurality of second step structures. In the direction from the inner cover plate to the outer cover plate, the size of each second step structure is larger than the size of the previous second step structure, so that the internal space of the annular groove gradually decreases.
7. The network device according to claim 5, characterized in that, At least one sidewall of the annular protrusion is inclined, and in the direction from the inner cover plate to the outer cover plate, the sidewall is inclined toward the direction closer to another sidewall, so that the size of the annular protrusion gradually decreases. At least one inner sidewall of the annular groove is inclined, and in the direction from the inner cover plate to the outer cover plate, the inner sidewall is inclined in a direction away from the other sidewall, so that the internal space of the annular groove gradually decreases.
8. The network device according to any one of claims 2-7, characterized in that, The annular groove includes an inner annular groove and an outer annular groove, the inner annular groove and the outer annular groove are spaced apart, and the outer annular groove is located around the inner annular groove; The annular protrusion includes an inner annular protrusion and an outer annular protrusion, which are spaced apart, and the outer annular protrusion is located around the inner annular protrusion; the inner annular protrusion and the inner annular groove are in zero-clearance fit, and the outer annular protrusion and the outer annular groove are in zero-clearance fit.
9. The network device according to claim 1, characterized in that, It also includes a sealing cap fixed to the inner cover plate and located between the inner cover plate and the outer cover plate. The sealing cap has a wire hole, and a sealing ring is provided on the inner edge of the wire hole. The inner cover plate has a network interface facing the wire hole, and the outer cover plate has a wire outlet facing the wire hole. The wire outlet is used to avoid external cables. The network interface is used to connect to external cables. The sealing ring is used to press-fit with the external cables to achieve a seal.
10. The network device according to claim 1, characterized in that, It also includes fasteners disposed inside the housing and adjacent to the opening, wherein the outer cover plate is detachably fixed to the fasteners when the outer cover plate is connected to the housing and covers the opening.