A cabinet shell connecting structure and an electrical cabinet

Abstract

The application provides a cabinet shell connecting structure and an electrical cabinet, wherein the cabinet shell connecting structure comprises: a side plate, a top edge of the side plate is sequentially connected with a first step portion and a second step portion from inside to outside, the first step portion comprises a first table and a first vertical wall, and the second step portion comprises a second table and a second vertical wall; and a top plate, a side edge of the top plate is sequentially provided with a first butt joint portion and a second butt joint portion from bottom to top, the first butt joint portion comprises a connecting wall extending vertically and a first folding edge connected with the connecting wall and extending inwardly, and the second butt joint portion comprises a second folding edge extending inwardly and a third vertical wall connected with the second folding edge; the first folding edge is spaced apart from the first vertical wall; the first folding edge is attached to the first table along the vertical direction, and cooperates with the connecting wall, the first vertical wall and the second folding edge to form a liquid containing chamber; and the second vertical wall is opposite to the third vertical wall, and the second vertical wall and the third vertical wall are tightly connected along the horizontal direction. The shell connecting structure can improve the waterproof performance of the shell.

Description

Technical Field

[0001] This invention relates to the field of cabinet technology, specifically to a cabinet shell connection structure and an electrical cabinet. Background Technology

[0002] Outdoor server racks, such as photovoltaic inverter racks, energy storage racks, and even vending machine racks, are exposed to the elements and must withstand sun, rain, and wind. Furthermore, their internal components often contain waterproof electrical parts, thus requiring high waterproof performance from the rack's casing. Currently, outdoor rack casings are generally constructed from separate sheet metal components. These components can be joined together by welding, riveting, or screwing. However, for ease of assembly, riveting or screwing is currently the primary method for connecting the outer panels of the rack casing. Riveting or screwing can create gaps at the mating points between the panels, allowing rainwater to enter the casing. To address this, existing technologies typically incorporate an L-shaped fold on one of the mating panels, with the other panel covering this fold. This creates a smooth transition between the two panels and increases the deflection of rainwater, improving waterproofing. However, this connection structure still presents water ingress issues under heavy wind and rain. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a cabinet shell connection structure and an electrical cabinet, which can improve the waterproof performance of the shell.

[0004] In at least one embodiment, a cabinet housing connection structure is disclosed, comprising: a side panel, the top edge of which is sequentially provided with a first step portion and a second step portion, the first step portion including a first platform and a first vertical wall, the second step portion including a second platform and a second vertical wall; and a top panel, the side edge of which is sequentially provided with a first mating portion and a second mating portion from bottom to top, the first mating portion including a vertically extending connecting wall and a first folded edge that connects to the connecting wall and extends inward, the second mating portion including a second folded edge that extends inward and a third vertical wall that connects to the second folded edge; the first folded edge is spaced apart from the first vertical wall; the first folded edge is vertically attached to the first platform and cooperates with the connecting wall, the first vertical wall, and the second folded edge to form a liquid-containing chamber; the second vertical wall and the third vertical wall are opposite each other and are fastened together in the horizontal direction.

[0005] In existing cabinet enclosures, after the top panel and side panel are spliced ​​together, a narrow and continuous gap is formed between their mating surfaces. Rainwater rises along this gap under capillary action and is squeezed into the depths of the gap under wind pressure. In the above design, when the top panel is placed on the side panel, the first and second steps at the top edge of the side panel and the first and second mating parts at the side edge of the top panel are vertically staggered, forming two steps at the joint between the top panel and the side panel. The first folded edge is vertically attached to the first countertop. At the same time, the first folded edge, the connecting wall, the first vertical wall, and the second folded edge together form a liquid-containing chamber. Rainwater seeps into the liquid-containing chamber due to capillary action and is temporarily stored. After the rain stops, it is discharged outward under gravity. Unlike conventional folded edge overlapping structures, it does not rely on the narrow gap between the mating surfaces to block water, thus avoiding the situation where rainwater climbs upward in the gap by capillary action and seeps into the cabinet. Furthermore, the liquid-containing chamber can also buffer instantaneous rainwater, making it less likely for rainwater to cross the first vertical wall and enter the cabinet when the rainfall is heavy. This helps to improve the waterproof performance at the joint between the top panel and the side panel.

[0006] However, when it is not advisable to weld the top plate and side plate in situations where they need to be painted separately and disassembled on site, they are usually connected by fasteners. These fasteners are often installed on the horizontal surface of the top plate or side plate, which is also the convergence surface of rainwater. The fastening holes can easily become channels for rainwater to enter the interior of the casing. To address this, the design incorporates multiple stepped sections and connecting sections. The second and third vertical walls are opposite each other and horizontally fastened together. The fastening position between the top plate and the side plate is moved from the outer edge of the shell to the inner second stepped section. Fasteners are horizontally inserted through the two vertical walls of the second and third vertical walls. The fastening holes do not penetrate the horizontal surface that receives rainwater, avoiding the situation where fastening holes are located on the edge or horizontal surface that receives rainwater, which could easily become leakage channels. Furthermore, the second edge is vertically fitted to the second platform, making it difficult for the top plate to shift when the fasteners are tightened. The force between the top plate and the side plate is transmitted through the contact surface between the second edge and the second platform, as well as the two vertical walls. The force path at the connection is short, and the first stepped section no longer needs to provide support for the fastening. The width of the first platform and the height of the first vertical wall can be set according to the needs of water blocking and water storage, ensuring reliable connection while providing sufficient volume for the liquid storage chamber. This helps to balance the waterproof performance and connection reliability at the shell splice.

[0007] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the edge of the first folded edge facing the first vertical wall has a first gap with the first vertical wall, the width of the first gap being suitable for disrupting the capillary tension of the water film.

[0008] In the above design, since there is a first gap between the edge of the first folded edge facing the first vertical wall and the first vertical wall, and the width of the first gap is suitable for disrupting the capillary tension of the water film, rainwater cannot form a continuous water film between the edge of the first folded edge and the first vertical wall, thus losing the traction to climb up along the first vertical wall, and can only fall back into the liquid chamber and be discharged outward, thereby further reducing the possibility of rainwater crossing the first vertical wall and entering the cabinet.

[0009] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the second folded edge is vertically attached to the second tabletop.

[0010] In the above design, since the second folded edge is vertically attached to the second platform, the vertical position of the side edge of the top plate is defined by the second platform. The weight of the top plate is transferred to the second step through the contact surface between the second folded edge and the second platform. When the fasteners lock the second and third vertical walls, the top plate is not easy to move, and the distance between the second and third vertical walls can remain stable. Furthermore, the second folded edge covers the top of the liquid-containing chamber, blocking the communication between the liquid-containing chamber and the inside of the cabinet shell. Rainwater in the liquid-containing chamber cannot pass over from above and can only be discharged from the outside.

[0011] The applicant also discovered that in the prior art, when two plates are connected by fasteners, the opposing walls are usually pressed together to ensure a firm connection. However, there is also a narrow gap between the two walls that are pressed together, and rainwater can easily spread along the pressed walls to the perforation of the fastener after reaching this gap.

[0012] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, there is a second gap between the opposing walls of the second vertical wall and the third vertical wall, the width of the second gap being suitable for disrupting the capillary tension of the water film.

[0013] In the above design, since there is a second gap between the opposing surfaces of the second and third vertical walls, and the width of the second gap is suitable for disrupting the capillary tension of the water film, rainwater cannot form a continuous water film between the second and third vertical walls, and it is difficult for it to spread along the connecting wall surface to the perforation position of the fastener. The wall surface where the fastener is located can remain dry. Even if rainwater crosses the first vertical wall, it can be prevented from reaching the fastening hole by means of the second gap, thereby further forming a waterproof barrier at the mechanical connection.

[0014] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the upper edge of the second vertical wall extends to the lower surface near the top plate.

[0015] In the above design, since the upper edge of the second vertical wall extends to the lower surface of the top plate, rainwater that has crossed the first vertical wall needs to climb over the upper edge of the second vertical wall to enter the cabinet. The flow cross-section between the upper edge of the second vertical wall and the lower surface of the top plate is small, making it difficult for rainwater to cross. Furthermore, the increased height of the second vertical wall improves its bending resistance, which helps to maintain the stability of the width of the second gap.

[0016] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the connection structure further includes fasteners and a waterproof nut fixed to the side of the third vertical wall away from the second vertical wall, the fasteners passing through the second vertical wall in a horizontal direction and screwed and locked to the waterproof nut, and the fasteners being located above the second platform.

[0017] In the above design, since the fastener passes through the second vertical wall horizontally and is screwed and locked to the waterproof nut on the side of the third vertical wall away from the second vertical wall, the axis of the fastener is horizontal, and the fastening hole is located on the vertical wall surface without crossing the horizontal plane that receives rainwater. Furthermore, since the fastener is located above the second countertop, rainwater flowing down the wall surface will not accumulate at the fastener. Even if the waterproof nut fails due to improper riveting or rivet placement, rainwater is unlikely to enter the cabinet through the hole, thereby reducing the possibility of leakage at the fastening hole.

[0018] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the top plate includes a top plate body and a reinforcing member; the reinforcing member extends along the side edge of the top plate body and is fixed to the top plate body, and the reinforcing member is provided with a second folded edge and a third vertical wall.

[0019] In the above design, since the top plate includes the top plate body and the reinforcing member, the second folded edge and the third vertical wall are formed by the reinforcing member extending along the side edge of the top plate body and fixed to the top plate body. The wall surface bearing the fastening force is provided by the reinforcing member, and its plate thickness and cross-sectional height can be selected according to the load-bearing requirements. The fastening force is distributed and transmitted along the side edge of the top plate through the reinforcing member, and the top plate body is not prone to local deformation at the fastening position. In addition, the reinforcing member improves the bending resistance of the side edge of the top plate, and the top plate is not prone to warping deformation during transportation and hoisting. This is conducive to keeping the fit between the second folded edge and the second platform and the fit between the second vertical wall and the third vertical wall consistent along the entire edge.

[0020] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the reinforcing member is provided with a fourth vertical wall opposite to the third vertical wall, and the fourth vertical wall is connected to the downturned wall formed by the side edge of the top plate body.

[0021] In the above design, since the fourth vertical wall is connected to the downward-turned wall formed by the downward turning of the side edge of the top plate body, the reinforcing member itself forms a "U" shaped bend, which has good structural rigidity and can further improve the structural stability of the side edge of the top plate. At the same time, it has a larger contact and fixed connection area with the top plate body, which is conducive to improving the connection between the reinforcing member and the top plate body.

[0022] In the cabinet housing connection structure disclosed in at least one embodiment, preferably, the first step portion and the second step portion are integrally formed by continuous inward bending from the top edge of the side plate.

[0023] In the above design, since the first step and the second step are formed by continuous bending from the top edge of the side plate inward, the material at the bending point is continuous, the bending resistance of the top of the side plate is improved, and the width of the first gap and the second gap can be kept consistent along the edge length direction. Furthermore, the first wall and the second wall are formed directly by bending, without the need for additional connecting parts, which helps to reduce the number of parts and assembly steps.

[0024] In at least one embodiment, an electrical cabinet is disclosed, the electrical cabinet comprising: a frame, side panels and a top panel, wherein the side panels and the top panel are spliced ​​and fixed to the frame using a cabinet shell connection structure as described in any of the preceding embodiments.

[0025] In the above design, since the side panels and top panels are spliced ​​and fixed to the frame using the above-mentioned cabinet shell connection structure, the splicing seam at the top of the shell is supported by the liquid-containing chamber, and the fasteners are located on the vertical wall surface, the top panel and side panels can be sprayed separately and then assembled to the frame by fasteners. The shell can be assembled and disassembled without welding or gluing, which facilitates the color-separated spraying of the cabinet and subsequent maintenance. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the cabinet housing connection structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly state of the cabinet housing connection structure according to an embodiment of the present invention; Figure 3 This is a front view of the cabinet housing connection structure according to an embodiment of the present invention; Figure 4 for Figure 1 An enlarged schematic diagram of part A in the middle; Figure 5 for Figure 3 Enlarged diagram of part B.

[0028] Explanation of key figure labels: Side panel 100; First step 110; First platform 111; First vertical wall 112; Second step 120; Second platform 121; Second vertical wall 122; Top plate 200; Top plate body 201; Reinforcing member 202; First docking part 210; Connecting wall 211; First folded edge 212; Second docking part 220; Second folded edge 221; Third vertical wall 222; Fourth vertical wall 223; Downward-turning wall 230; First gap 310; Second gap 320; Waterproof nut 410; Frame 500. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0031] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0032] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0033] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0034] Example Reference Figure 1 and Figure 2 This embodiment relates to an electrical cabinet. The electrical cabinet includes a frame 500, side panels 100 and a top panel 200, and typically also includes a door panel. The frame 500 is formed by connecting columns and beams, the side panels 100 are connected to the sides of the frame 500, and the top panel 200 covers the top of the frame 500.

[0035] Reference Figure 1 and Figure 2 The electrical cabinet's housing includes the aforementioned side panel 100 and top panel 200. The joint between the top panel 200 and the side panel 100 is located at the upper part of the cabinet and extends horizontally, making it a location where rainwater easily collects and intrudes into the cabinet. To improve the waterproof performance of the cabinet housing at the panel joint, the side panel 100 and top panel 200 of the electrical cabinet are joined and fixed to the frame 500 using a cabinet housing connection structure described in this embodiment: the side edge of the top panel 200 rests on the top edge of the side panel 100, and the joint is vertically staggered to form two steps; the bend of the side edge of the top panel 200 and the bend of the top of the side panel 100 form a liquid-retaining chamber capable of collecting rainwater; the top panel 200 and the side panel 100 are horizontally fastened together closer to the inside of the cabinet, with the fastening position higher than the rainwater-receiving step surface of the side panel 100.

[0036] For ease of understanding, please refer to the following: Figure 1 , Figure 2 and Figure 3 First, let's explain the directions involved in this embodiment. When the cabinet is placed normally, the side where the top plate 200 is located is considered "up," and the side opposite to "up" is considered "down." Taking the joint between the top plate 200 and the side plate 100 as a reference, the side facing the inside of the cabinet is considered "inner," and the side facing the outside of the cabinet is considered "outer." The horizontal direction extending from the joint between the top plate 200 and the side plate 100 is the length direction of the side plate 100. For a vertically mounted cuboid cabinet, it can have left-right and front-back directions, both of which are horizontal, while the up-down direction is vertical. The directions described below are based on the directions shown in the accompanying drawings and are only used to illustrate the relative positional relationships between the components.

[0037] The following example, using the splicing position between the top panel 200 and one of the side panels 100, illustrates the specific details of the cabinet shell connection structure.

[0038] Combination Figure 4 and Figure 5The side panel 100 is made of sheet metal and is a vertically extending plate. A first step portion 110 and a second step portion 120 are sequentially connected inwards from the top edge of the side panel 100, with the second step portion 120 located inside the first step portion 110. In this embodiment, the stepped portion, formed by bending at the top of the side panel 100 and having a height difference, is called the step portion. The generally horizontally extending surface within the step portion is called the platform, and the generally vertically extending surface connected to the platform is called the vertical wall. The first step portion 110 includes a first platform 111 and a first vertical wall 112, and the second step portion 120 includes a second platform 121 and a second vertical wall 122. In this embodiment, the first countertop 111 extends horizontally from the top edge of the side panel 100 towards the interior of the cabinet, and the first vertical wall 112 extends vertically upward from the inner end of the first countertop 111. The first countertop 111 and the first vertical wall 112 are connected by a continuous bend. The second countertop 121 extends further into the cabinet from the upper end of the first vertical wall 112, and its width extending into the cabinet is greater than that of the first countertop 111. The second vertical wall 122 extends upward from the inner end of the second countertop 121, and its upper edge extends to near the lower surface of the top panel 200. In this embodiment, the first step portion 110 and the second step portion 120 are integrally formed by continuous bending inward from the top edge of the side panel 100. The material is continuous at the bend, and the top of the side panel 100 thus forms a rigid cross-section with multiple folds, which improves the bending resistance. The first vertical wall 112 and the second vertical wall 122 are directly formed by bending, without the need for additional connecting parts. The platform formed by bending at the top of the side panel 100 and the vertical wall extend continuously along the length of the side panel 100. Figure 4 The bent section can be seen at the corner of the top plate shown at 200.

[0039] In another embodiment, the first step portion 110 and the second step portion 120 may also be formed by a bent member separately formed from the side plate 100. The bent member extends along the length of the side plate 100 and is fixed to the top edge of the side plate 100, for example, by welding, riveting, or screwing. The bent member and the top edge of the side plate 100 together constitute the first step portion 110 and the second step portion 120. Furthermore, the first platform 111 and the second platform 121 are not limited to a strictly horizontal plane, and the first vertical wall 112 and the second vertical wall 122 are not limited to a strictly vertical plane. Slight inclination is allowed as long as it can receive rainwater and provide a place for the top plate 200 to be placed. For example, the first platform 111 may be slightly inclined downward from its inner end to its outer end, so that rainwater falling on the first platform 111 can flow outward more easily.

[0040] like Figure 4 and Figure 5As shown, the top plate 200 includes a top plate body 201 and a reinforcing member 202. The top plate body 201 is a board material covering the top of the cabinet. The side edge of the top plate 200 has a first mating portion 210 and a second mating portion 220 arranged sequentially from bottom to top, with the second mating portion 220 located above the first mating portion 210. In this embodiment, the portion extending from the side edge of the top plate 200 towards the side plate 100 and connecting with the stepped portion of the side plate 100 is called the mating portion, and the narrow strip-shaped portion formed by bending the edge of the board is called the folded edge. The first mating portion 210 includes a vertically extending connecting wall 211 and a first folded edge 212 that connects to the connecting wall 211 and extends inward; the second mating portion 220 includes a second folded edge 221 that extends inward and a third vertical wall 222 that connects to the second folded edge 221.

[0041] In this embodiment, the side edge of the top plate body 201 is folded downward to form a drooping sidewall. The upper half of this sidewall is a folded-down wall 230, and the lower half is a connecting wall 211. The connecting wall 211 is located below the folded-down wall 230 and is continuously connected to the folded-down wall 230 vertically. The vertically extending connecting wall 211 in the first docking portion 210 is formed by the lower half of this drooping sidewall. In this embodiment, in the drooping sidewall formed by the downward folding of the side edge of the top plate body 201, the wall surface in the upper half is called the folded-down wall 230, and the wall surface in the lower half is called the connecting wall 211. The lower end of the connecting wall 211 is bent inward to form a first folded edge 212. The first folded edge 212 is connected to the connecting wall 211 and extends into the cabinet interior in a generally horizontal direction. The first docking portion 210 is located at the lower part of the side edge of the top plate 200.

[0042] In another embodiment, the first folded edge 212 can be formed by a single bend from the lower end of the connecting wall 211, or by two or more consecutive bends. The same applies to the second folded edge 221. That is, the folded edge is not limited to a narrow strip formed by a single bend from the edge of the plate. The lower folded wall 230 and the connecting wall 211 are not limited to being formed by integrally folding the side edge of the top plate body 201. They can also be formed separately and then vertically joined and fixed, for example, by welding, riveting, or screwing. In this case, the upper wall surface is still the lower folded wall 230, and the lower wall surface is still the connecting wall 211. In addition, the drooping side wall is not limited to a strictly vertical plane. It is allowed to be slightly inclined, provided that it can connect with the first folded edge 212 and the second folded edge 221.

[0043] like Figure 5As shown, the reinforcing member 202 extends along the side edge of the top plate body 201 and is fixedly disposed below the top plate body 201. In this embodiment, the component fixed to the top plate body 201 and used to improve the rigidity of the side edge of the top plate 200 is called the reinforcing member 202. The reinforcing member 202 is provided with a second flange 221 and a third vertical wall 222, and the second mating portion 220 of the top plate 200 is formed by the reinforcing member 202; the reinforcing member 202 is also provided with a fourth vertical wall 223 opposite to the third vertical wall 222. Specifically, the cross-section of the reinforcing member 202 is U-shaped with the opening facing upwards. The second folded edge 221 extends in a generally horizontal direction, which is the inwardly extending second folded edge 221 in the second docking portion 220. The third vertical wall 222 extends upwards from the inner end of the second folded edge 221, which is the third vertical wall 222 in the second docking portion 220 that connects with the second folded edge 221. The fourth vertical wall 223 extends upwards from the outer end of the second folded edge 221 and is opposite to the third vertical wall 222. The fourth vertical wall 223 is connected to the downturned wall 230 formed by the downturned side edge of the top plate body 201. In this embodiment, the outer surface of the fourth vertical wall 223 is in contact with the inner surface of the downturned wall 230, and the two are fixed by welding, riveting, or screwing. The groove of the reinforcing member 202 is closed by the top plate body 201, and the reinforcing member 202 and the side edge of the top plate body 201 together form a closed groove-shaped cross-section. The second docking portion 220 is located above the first docking portion 210. The reinforcing member 202 can be a profile formed by bending a sheet material of the same material as the top plate body 201.

[0044] In another embodiment, the reinforcing member 202 can also be integrally formed with the top plate body 201, that is, the fourth vertical wall 223 and the downward-turned wall 230 are formed by bending the same sheet material and connected as one piece, and the connection between the two is an integral connection. In this embodiment, the reinforcing member 202 and the side edge of the top plate body 201 still together form a closed groove cross section, and the wall surface bearing the fastening force is still provided by the bent reinforcing member 202. In addition, the connection between the fourth vertical wall 223 and the downward-turned wall 230 is not limited to welding, riveting or screwing, but can also be continuously welded along the entire length of the side edge of the top plate body 201.

[0045] When the top plate 200 is placed on the side plate 100, as Figure 4 and Figure 5As shown, the first mating portion 210 of the side edge of the top plate 200 corresponds to the first step portion 110 of the top of the side plate 100, and the second mating portion 220 corresponds to the second step portion 120. The first step portion 110 and the second step portion 120 are vertically staggered, thus forming two steps at the joint between the top plate 200 and the side plate 100. The first folded edge 212 rests on the first platform 111 and is vertically attached to the first platform 111. The weight of the top plate 200 is transferred to the side plate 100 through the contact surface between the first folded edge 212 and the first platform 111. The second folded edge 221 rests on the second platform 121 and is vertically attached to the second platform 121. The vertical position of the side edge of the top plate 200 is defined by the second platform 121. The weight of the top plate 200 is also transferred to the second step portion 120 through the contact surface between the second folded edge 221 and the second platform 121. In this embodiment, "fitting" refers to two surfaces abutting against each other along their normal direction. Assembly gaps are allowed between them, and complete overlap or sealing of the surfaces is not required. The first folded edge 212 is spaced relative to the first vertical wall 112. This relative space means that the two walls face each other with a distance between them; that is, the edge of the first folded edge 212 facing the first vertical wall 112 faces the first vertical wall 112 with a distance between them, forming a first gap 310. The second vertical wall 122 is opposite to the third vertical wall 222, with the opposing walls facing each other with a distance between them, forming a second gap 320.

[0046] In another embodiment, the widths of the first gap 310 and the second gap 320 may be the same or different. In areas where rainwater is difficult to reach, the first gap 310 or the second gap 320 may be omitted or the gap reduced, as long as the width of the gap in areas where rainwater can easily reach is greater than the critical width for the water film to bridge between the two side walls. The liquid-containing chamber is not limited to a completely enclosed cavity; the second folded edge 221 may only cover a portion of the liquid-containing chamber, as long as the rainwater falling into the liquid-containing chamber can be discharged outwards under gravity.

[0047] The first folded edge 212 is vertically attached to the first platform 111, and cooperates with the connecting wall 211, the first vertical wall 112, and the second folded edge 221 to form a liquid-containing chamber, such as Figure 5As shown. In this embodiment, the liquid-containing chamber is a space enclosed by the aforementioned walls, capable of temporarily collecting and discharging water. It is not limited to a sealed cavity or a tank with a fixed volume. The first folded edge 212 is located at the lower part of the liquid-containing chamber, the connecting wall 211 forms the outer wall of the liquid-containing chamber, the first vertical wall 112 forms the inner wall of the liquid-containing chamber, and the second folded edge 221 covers the upper part of the liquid-containing chamber. Rainwater flowing downwards along the inner side of the connecting wall 211 falls into the liquid-containing chamber, collects at the lower part of the chamber, and is discharged outwards under gravity. The first platform 111 is located below the first folded edge 212, capable of receiving the rainwater falling there and guiding it outwards. The second folded edge 221 is located above the liquid-containing chamber and seals it, preventing rainwater from passing over it. The fit between the second folded edge 221 and the second platform 121 also isolates the liquid-containing chamber from the interior of the cabinet.

[0048] The width of the first gap 310 is suitable for disrupting the capillary tension of the water film, meaning that the width prevents the water film from extending continuously between the edge of the first fold 212 and the first vertical wall 112, and rainwater cannot climb upwards along the first vertical wall 112. Rainwater reaching the first gap 310 cannot form a continuous water film between the edge of the first fold 212 and the first vertical wall 112, and after losing the traction to climb upwards along the first vertical wall 112, it falls back into the liquid-containing chamber and is discharged outwards, reducing the likelihood of rainwater crossing the first vertical wall 112 and entering the cabinet interior.

[0049] In this embodiment, the width of the gap refers to the distance between two relatively spaced walls along their normal direction. When rainwater forms a water film between the walls on both sides of the gap, the water film crosses the gap in the form of a concave liquid surface and bridges between the two walls. Capillary tension thus continuously pulls the rainwater into the gap and upward along the walls. When the width of the gap is greater than the critical width for the water film to bridge between the two walls, the concave liquid surface cannot cross the gap to maintain a continuous liquid surface. The capillary tension of the water film is disrupted, and the rainwater loses its upward pull along the walls and falls back under the action of gravity. The above-mentioned critical width is related to the surface tension of the rainwater, the material and surface condition of the walls on both sides of the gap, the geometry of the walls on both sides of the gap, and the external wind pressure. Under the conditions of rainwater and coated metal plates, it is on the order of millimeters and can be determined by those skilled in the art through conventional capillary climb tests. For example, rainwater is brought into contact with the two walls of the gap from the lower end of the gap, the width of the gap is changed from small to large, and the extension of the water film along the gap is observed. The width of the gap when the water film no longer extends continuously across the gap is taken as the critical width.

[0050] In one embodiment, such as Figure 4 and Figure 5As shown, the width of the first gap 310 is 5mm to 10mm, and the width of the second gap 320 is 5mm to 10mm. The widths of the first gap 310 and the second gap 320 can be the same or different, as long as they are both greater than the aforementioned critical widths. The widths of the first gap 310 and the second gap 320 can also be determined by combining the bending tolerances of the side plate 100 and the top plate 200, the machining tolerances of the side edges of the top plate 200, and the assembly tolerances of the side plate 100 and the top plate 200, so that the actual widths of the first gap 310 and the second gap 320 after the top plate 200 is assembled with the side plate 100 are still greater than the aforementioned critical widths. When the fasteners are tightened, the minimum distance between the second vertical wall 122 and the third vertical wall 222 is limited by the following spacer, so that the width of the second gap 320 remains within the aforementioned range after the fasteners are tightened, thereby cutting off the capillary path of the water film leading to the fastening hole while the top plate 200 and the side plate 100 are fastened together.

[0051] The second vertical wall 122 and the third vertical wall 222 are opposite each other and are fastened together in a horizontal direction, that is, they are locked together by fasteners with the axis of the fasteners approximately in the horizontal direction. Figure 5 As shown, the connection structure also includes fasteners and a waterproof nut 410 fixed to the side of the third vertical wall 222 facing away from the second vertical wall 122. The fastener passes horizontally through the second vertical wall 122 and is screwed and locked to the waterproof nut 410, and the fastener is located above the second platform 121. The waterproof nut 410 is a nut fixed to the plate and has sealing capability. It can be formed on the third vertical wall 222 by press riveting, pulling riveting, or welding. Figure 4 The image shows a waterproof nut 410 formed on the third vertical wall 222. Since the axis of the fastener is approximately horizontal, the fastening hole is opened on the two approximately vertical walls of the second vertical wall 122 and the third vertical wall 222, without crossing the horizontal plane that receives rainwater; the fastener is located above the second platform 121, and rainwater flowing down the wall will not accumulate at the fastener. Even if the waterproof nut 410 fails due to improper riveting or pulling, rainwater is not likely to enter the cabinet interior through the fastening hole.

[0052] In one embodiment, the width of the second gap 320 is determined by a spacer disposed between the second vertical wall 122 and the third vertical wall 222. A spacer sleeve is fitted onto the fastener, the spacer sleeve is located between the second vertical wall 122 and the third vertical wall 222 and extends along the axial direction of the fastener, the two ends of the spacer sleeve abut against the opposite wall surfaces of the second vertical wall 122 and the third vertical wall 222, respectively, and the length of the spacer sleeve along the axial direction of the fastener is the width of the second gap 320. When the fastener is tightened, the tightening force applied by the fastener is transmitted sequentially through the second vertical wall 122, the spacer sleeve, and the third vertical wall 222. The tightening force is borne by the spacer sleeve, and the minimum distance between the second vertical wall 122 and the third vertical wall 222 is limited by the spacer sleeve. The two opposing wall surfaces will not come into contact with each other due to the tightening of the fastener. The width of the second gap 320 is maintained after the top plate 200 and the side plate 100 are assembled, and the relative position between the top plate 200 and the side plate 100 is also determined accordingly. The width of the first gap 310 is also maintained. The spacer sleeve can be made of metal, and its inner diameter is larger than the outer diameter of the fastener, allowing the fastener to pass freely through the spacer sleeve. By selecting spacer sleeves of different lengths, the width of the second gap 320 can be made to match the required width.

[0053] In another embodiment, instead of a separate spacer sleeve, the width of the second gap 320 can be defined by a waterproof nut 410. Specifically, the body of the waterproof nut 410 passes through the third vertical wall 222 and protrudes towards one side of the second vertical wall 122. The height of the protruding portion of the waterproof nut 410 corresponds to the width of the second gap 320. When the fastener is tightened, the wall surface of the second vertical wall 122 facing the third vertical wall 222 abuts against the end face of the protruding portion of the waterproof nut 410. In yet another embodiment, a protrusion can be provided on the wall surface of at least one of the second vertical wall 122 and the third vertical wall 222 facing the other. The top of the protrusion abuts against the opposite wall surface, and the height of the protrusion corresponds to the width of the second gap 320. The protrusion can be integrally stamped with the wall surface it is on, or it can be an independent component fixed to the wall surface. The aforementioned spacer sleeve or protrusion can be provided only at the location of the fastener, or multiple protrusions can be spaced apart along the length of the side plate 100.

[0054] In another embodiment, the axis of the fastener is allowed to be slightly inclined relative to the horizontal direction. The fastener can also be a stud that passes through the second vertical wall 122 and the third vertical wall 222, as long as the fastener locks the second vertical wall 122 and the third vertical wall 222 in a generally horizontal direction. The waterproof nut 410 is not limited to press riveting or riveting, but can also be welded to the third vertical wall 222. The number of fasteners and waterproof nuts 410 and the spacing along the length of the side plate 100 can be determined according to the size of the top plate 200 and the side plate 100 and the load they bear.

[0055] Combination Figure 5The width of the second gap 320 is also suitable for disrupting the capillary tension of the water film. Rainwater cannot form a continuous water film between the second vertical wall 122 and the third vertical wall 222, making it difficult for it to spread along the two walls to the perforation position of the fastener. The wall surface where the fastener is located can remain dry. The upper edge of the second vertical wall 122 extends to near the lower surface of the top plate 200. Rainwater that needs to cross the first vertical wall 112 needs to cross the upper edge of the second vertical wall 122 to enter the cabinet. The cross-section between the upper edge of the second vertical wall 122 and the lower surface of the top plate 200 that allows rainwater to pass through is small, making it difficult for rainwater to cross. Furthermore, the second vertical wall 122 has a larger height, which correspondingly increases its bending resistance, making it easier to maintain a stable width of the second gap 320.

[0056] Since the second folded edge 221 and the third vertical wall 222 are formed by the reinforcing member 202, the wall surface bearing the fastening force is provided by the reinforcing member 202. The plate thickness and cross-sectional height of the reinforcing member 202 can be selected according to the load-bearing requirements. The fastening force is distributed and transmitted along the length direction of the side edge of the top plate 200 through the reinforcing member 202, and the top plate body 201 is not prone to local deformation at the fastening position. The reinforcing member 202 also improves the bending resistance of the side edge of the top plate 200, and the top plate 200 is not prone to warping deformation during transportation and hoisting. This is conducive to ensuring that the fit between the second folded edge 221 and the second platform 121 and the fit between the second vertical wall 122 and the third vertical wall 222 are consistent along the entire edge. The reinforcing member 202 and the top plate body 201 together form a closed groove-shaped cross-section, with a large contact and fixing connection area between them. This improves the structural stability of the side edge of the top plate 200 and the connection strength between the reinforcing member 202 and the top plate body 201. The shape of the reinforcing member 202 at the side edge of the top plate 200 and its fitting relationship with the side plate 100 and the top plate 200 can be seen in… Figure 4 and Figure 5 .

[0057] During assembly, the top panel 200 and side panel 100 can be sprayed separately first. Then, the top panel 200 is hoisted to the top of the cabinet, so that the first folded edge 212 of the side edge of the top panel 200 rests on the first surface 111 of the side panel 100, and the second folded edge 221 rests on the second surface 121. The position of the top panel 200 is then adjusted so that the second vertical wall 122 is opposite to the third vertical wall 222. Subsequently, fasteners are inserted horizontally from the side of the second vertical wall 122 away from the third vertical wall 222, and screwed onto the waterproof nut 410 on the back side of the third vertical wall 222 after passing through the second vertical wall 122. This completes the fixing of the top panel 200 and the side panel 100 at the joint. The assembled state is as follows. Figure 2 As shown. No welding or glue is required between the top panel 200 and the side panel 100. The top panel 200 and the side panel 100 can be painted separately before assembly, making the disassembly and maintenance of the cabinet relatively convenient.

[0058] With the above structure, rainwater at the joint between the top plate 200 and the side plate 100 is collected by the liquid-containing chamber and discharged outward under gravity. The first gap 310 and the second gap 320 respectively cut off the capillary extension of the water film in the water flow path. The fasteners between the top plate 200 and the side plate 100 do not cross the horizontal plane that collects rainwater. The top of the cabinet can be assembled and disassembled without welding or gluing, which facilitates the color-coded spraying of the electrical cabinet and subsequent maintenance.

[0059] In existing cabinet housings, a narrow and continuous gap is formed between the mating surfaces of the top panel 200 and the side panel 100 after they are joined. Rainwater rises along this gap under capillary action and is squeezed deeper into the gap under wind pressure. In the above design, when the top panel 200 is placed on the side panel 100, the first step 110 and the second step 120 at the top edge of the side panel 100, and the first mating part 210 and the second mating part 220 at the side edge of the top panel 200 are vertically staggered, forming two steps at the joint between the top panel 200 and the side panel 100; the first folded edge 212 is vertically attached to the first platform 111, and the first folded edge 212, the connecting wall 211, the first vertical wall 112, and the second folded edge 221 together form a liquid-containing chamber, allowing rainwater to escape. After seeping into the liquid-containing chamber due to capillary action, it is temporarily stored and discharged outward under gravity after the rain stops. Unlike conventional folded and overlapping structures, it does not rely on the narrow gap between the mating surfaces to block water, thus avoiding the situation where rainwater climbs upward in the gap by capillary action and seeps into the cabinet. Furthermore, the liquid-containing chamber can also buffer instantaneous rainwater, making it less likely for rainwater to cross the first vertical wall 112 and enter the cabinet when the rainfall is heavy. This helps to improve the waterproof performance at the joint between the top panel 200 and the side panel 100.

[0060] However, furthermore, in situations where welding is not suitable for the top plate 200 and side plate 100 when they need to be painted separately and disassembled on-site, they are usually connected by fasteners. These fasteners often penetrate the horizontal surface of the top plate 200 or side plate 100, which is also a rainwater runoff surface. The fastening holes can easily become channels for rainwater to enter the housing. Therefore, the above design includes multi-level stepped sections and mating sections. The second vertical wall 122 and the third vertical wall 222 are opposite each other and fastened together horizontally. The fastening position between the top plate 200 and side plate 100 is moved from the edge near the outer side of the housing to the more inner second stepped section 120. The fasteners penetrate the two vertical walls of the second vertical wall 122 and the third vertical wall 222 horizontally. The fastening holes do not penetrate the rainwater-receiving horizontal surface, avoiding the situation where fastening holes are located on the rainwater-receiving folded edge or horizontal surface, which could easily become leakage channels. Furthermore, the second folded edge 221... Vertically attached to the second platform 121, the top plate 200 is not prone to displacement when the fasteners are tightened. The force between the top plate 200 and the side plate 100 is transmitted through the contact surface between the second folded edge 221 and the second platform 121, as well as the two vertical walls. The force path at the connection is relatively short, and the first step 110 no longer needs to provide support for the fastening. The width of the first platform 111 and the height of the first vertical wall 112 can be set according to the needs of water blocking and water storage. While ensuring reliable connection, the liquid storage chamber has sufficient volume, which is beneficial to balance the waterproof performance and connection reliability of the shell splice.

[0061] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A cabinet shell connection structure, characterized in that, include: A side panel (100) has a first step (110) and a second step (120) sequentially connected inward from its top edge. The first step (110) includes a first platform (111) and a first vertical wall (112), and the second step (120) includes a second platform (121) and a second vertical wall (122). The top plate (200) has a first docking part (210) and a second docking part (220) arranged sequentially from bottom to top on its side edge. The first docking part (210) includes a vertically extending connecting wall (211) and a first folded edge (212) that connects with the connecting wall (211) and extends inward. The second docking part (220) includes a second folded edge (221) that extends inward and a third vertical wall (222) that connects with the second folded edge (221). The first folded edge (212) is spaced apart from the first vertical wall (112); the first folded edge (212) is vertically attached to the first platform (111), and cooperates with the connecting wall (211), the first vertical wall (112), and the second folded edge (221) to form a liquid-containing chamber; The second vertical wall (122) is opposite to the third vertical wall (222), and the two are fastened together in the horizontal direction.

2. The cabinet shell connection structure as described in claim 1, characterized in that, The first fold (212) has a first gap (310) between its edge toward the first vertical wall (112) and the first vertical wall (112), the width of which is suitable for disrupting the capillary tension of the water film.

3. The cabinet shell connection structure as described in claim 1, characterized in that, The second folded edge (221) is vertically attached to the second tabletop (121).

4. The cabinet shell connection structure as described in claim 1 or 3, characterized in that, The second vertical wall (122) has a second gap (320) between the opposing surfaces of the second vertical wall (222) and the third vertical wall (222), the width of which is suitable for disrupting the capillary tension of the water film.

5. The cabinet shell connection structure as described in claim 1, characterized in that, The upper edge of the second vertical wall (122) extends to the lower surface of the top plate (200).

6. The cabinet shell connection structure as described in claim 1, characterized in that, The connection structure also includes fasteners and waterproof nuts (410) fixed on the side of the third vertical wall (222) away from the second vertical wall (122). The fasteners pass through the second vertical wall (122) in a horizontal direction and are screwed and locked to the waterproof nuts (410). The fasteners are located above the second platform (121).

7. The cabinet shell connection structure as described in claim 1, characterized in that, The top plate (200) includes a top plate body (201) and a reinforcing member (202); the reinforcing member (202) extends along the side edge of the top plate body (201) and is fixed to the top plate body (201), and the reinforcing member (202) is provided with a second folded edge (221) and a third vertical wall (222).

8. The cabinet housing connection structure as described in claim 7, characterized in that, The reinforcing member (202) is provided with a fourth vertical wall (223) opposite to the third vertical wall (222), and the fourth vertical wall (223) is connected to the downturned wall (230) formed by the side edge of the top plate body (201).

9. The cabinet shell connection structure as described in claim 1, characterized in that, The first step portion (110) and the second step portion (120) are integrally formed by continuously bending inward from the top edge of the side plate (100).

10. An electrical cabinet, characterized in that, It includes a frame (500), side panels (100) and a top panel (200), wherein the side panels (100) and the top panel (200) are spliced ​​and fixed to the frame (500) using the cabinet shell connection structure as described in any one of claims 1 to 9.

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