A sealing structure of a maintenance window on a sheet metal box
By using countersunk rivets and press-fit screws combined with O-rings on the sheet metal housing, the problems of deformation and poor sealing caused by welding were solved, achieving a reliable sealing effect without welding, reducing costs and improving connection reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YIDU INTELLIGENT SPECIAL EQUIP CO LTD
- Filing Date
- 2025-01-21
- Publication Date
- 2026-06-26
AI Technical Summary
In the existing sheet metal enclosure maintenance window sealing structure, welding causes local deformation and poor sealing effect, and there are welding risks, making it difficult to meet waterproof requirements.
A combination of countersunk rivets and press-fit screws with O-rings is used to achieve a weld-free seal by setting riveting mounting holes and press-fit screw through holes between the annular gasket and the cover. The annular gasket is fixed with countersunk blind rivets, and press-fit screws are used between the annular gasket and the cover for sealing.
It achieves reliable sealing without welding, avoids welding deformation and hidden dangers, reduces processing costs, and improves sealing effect and connection reliability.
Smart Images
Figure CN224410164U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a sheet metal box, specifically to a sealing structure for a maintenance window on a sheet metal box. Background Technology
[0002] As is well known, sheet metal enclosures often feature maintenance windows in certain areas for ease of maintenance. To meet waterproofing requirements, these windows need to be sealed. The common practice is to place a rubber gasket on the flange surface of the sheet metal part and then tighten it with screws. To control the weight and material costs of the enclosure, thinner sheet metal is used while still meeting structural strength requirements. To prevent the thinner sheet metal from being unable to withstand the pressure of the screws, leading to localized deformation and waterproofing failure, a ring-shaped gasket, approximately 2 to 3 times thicker than the enclosure sheet metal, is typically placed on the flange surface to increase rigidity, expand the stress area, and improve the fit. Currently, the ring-shaped gasket is usually welded to the enclosure. The ring-shaped gasket has rivet screws that pass through holes in the enclosure, the rubber gasket, and the maintenance window cover, and are tightened with nuts to achieve a seal between the maintenance window cover and the enclosure. However, welding the annular gasket to the enclosure can easily lead to localized deformation of the enclosure, especially since a full weld around the annular gasket to the enclosure is required to ensure a tight seal, which inevitably increases the amount of deformation. Furthermore, the welding process is lengthy and carries the risk of localized burn-through or missed welds, which can negatively impact the sealing performance. Therefore, there is an urgent need to develop a technical solution that can replace the existing sealing structure for maintenance windows on sheet metal enclosures. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a sealing structure for a maintenance window on a sheet metal box that does not require welding.
[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a sealing structure for a maintenance window on a sheet metal box, comprising: an annular pad located on the inner side of the maintenance window, with a corresponding window opening in its middle; and a cover located on the outer side of the maintenance window and cooperating with it. The cover is set on the outer side of the maintenance window by an annular sealing gasket, covering the maintenance window therein. The specific arrangement of the cover is as follows: a plurality of rivet screws are arranged circumferentially on the annular pad, and at least two riveting mounting holes are also provided on the annular pad. The sheet metal box is provided with countersunk riveting mounting holes corresponding to the riveting mounting holes on the annular pad, and rivet screw holes corresponding one-to-one with the rivet screws, around the maintenance window. After the O-rings are fitted onto the rivet screws on the plate, they pass through the corresponding rivet screw holes on the sheet metal housing one by one. Countersunk blind rivets are selected and installed in the countersunk riveting mounting holes on the sheet metal housing and the riveting mounting holes on the annular washer. The cover is provided with an annular mounting edge corresponding to the edge of the maintenance window. The annular sealing gasket corresponds to the annular mounting edge of the cover. The annular sealing gasket is provided with rivet screw holes that correspond one-to-one with the rivet screw holes on the sheet metal housing. The annular mounting edge of the cover is provided with rivet screw holes that correspond one-to-one with the rivet screw holes on the sheet metal housing. After the rivet screws continue to pass through the rivet screw holes on the annular sealing gasket and the rivet screw holes on the annular mounting edge of the cover, they are tightened with nuts.
[0005] As a preferred embodiment, in the sealing structure of the maintenance window on the sheet metal box, the maintenance window is arranged in a square shape, and correspondingly, the window in the middle of the annular pad is also arranged in a rectangular shape. The annular pad has at least one riveting mounting hole on each of its four sides.
[0006] As a preferred embodiment, in the sealing structure of the maintenance window on the sheet metal box, the annular pad has a rivet mounting hole centered on each of its four sides.
[0007] As a preferred embodiment, in the sealing structure of the maintenance window on the sheet metal box, the maintenance window is arranged in a rectangular shape, and correspondingly, the window in the middle of the annular pad is also arranged in a rectangular shape. The number of rivet screws provided on the annular pad in the length direction is greater than the number of rivet screws provided in the width direction.
[0008] As a preferred embodiment, in the sealing structure of the maintenance window on the sheet metal enclosure, the annular sealing gasket is a rubber gasket.
[0009] As a preferred embodiment, in the sealing structure of the maintenance window on the sheet metal enclosure, the O-ring is an O-ring rubber ring.
[0010] The beneficial effects of this utility model are:
[0011] 1. This utility model features countersunk riveting mounting holes along the edge of the maintenance window of the enclosure and corresponding riveting mounting holes on an annular pad. The annular pad is fixed to the enclosure using corresponding countersunk blind rivets. On the inside of the maintenance window, O-rings are fitted onto the rivet screws on the annular pad to seal the rivet screw holes on the enclosure. On the outside of the maintenance window, an annular sealing gasket is placed between the annular mounting edge of the cover and the enclosure for sealing. This ingenious method achieves a complete seal of the maintenance window without welding, avoiding a series of problems caused by welding, reducing processing costs, and making manufacturing more flexible and convenient.
[0012] 2. This utility model makes the connection between the annular pad and the box body more reliable by opening at least one riveting installation hole on each of the four sides of the annular pad.
[0013] 3. This utility model further increases the reliability of the connection between the annular pad and the box body by opening a riveting mounting hole in the center of each of the four sides of the annular pad.
[0014] 4. By setting more rivet screws along the length of the annular gasket, the annular sealing gasket can be more smoothly clamped between the annular mounting edge of the cover and the box body, which greatly improves the sealing effect between the cover and the box body. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the sheet metal box body described in this utility model from one perspective.
[0016] Figure 2 This is a three-dimensional structural diagram of the sheet metal box body described in this utility model from another perspective.
[0017] Figure 3 This is an exploded structural diagram of the sheet metal box body described in this utility model.
[0018] Figure 4 This is a schematic diagram of the front view of the sheet metal box body described in this utility model.
[0019] Figure 5 yes Figure 4 A schematic diagram of the AA cross-sectional structure.
[0020] Figure 6 yes Figure 5 A magnified structural diagram of part B.
[0021] Figure 7 yes Figure 5 A magnified structural diagram of section C.
[0022] Figures 1 to 7 The attached diagrams are labeled as follows: 1. Sheet metal housing; 10. Maintenance window; 11. Countersunk riveting mounting hole; 12. Press-fit screw hole; 2. Annular gasket; 20. Window; 21. Riveting mounting hole; 22. Press-fit screw; 3. O-ring seal; 4. Countersunk blind rivet; 5. Annular sealing gasket; 52. Press-fit screw hole; 6. Cover; 61. Annular mounting edge; 612. Press-fit screw hole; 7. Nut. Detailed Implementation
[0023] The following describes in detail, with reference to the accompanying drawings, a specific implementation scheme of the sealing structure for a maintenance window on a sheet metal enclosure according to the present invention.
[0024] like Figures 1 to 3 As shown, the sealing structure of the maintenance window on the sheet metal box of this utility model includes: an annular pad 2 located on the inner side of the maintenance window 10, with a window 20 corresponding to the maintenance window 10 in its middle, and a cover 6 located on the outer side of the maintenance window 10 and cooperating with the maintenance window 10. The cover 6 is set on the outer side of the maintenance window 10 through an annular sealing gasket 5, covering the maintenance window 10. In this embodiment, the maintenance window 10 is rectangular, and correspondingly, the annular pad 2, the annular sealing gasket 5, and the cover 6 are all rectangular. The cover 6 is set in such a way that twelve rivet screws 22 are arranged around the annular pad 2 (on both sides in the length direction). (4 on each side, 2 on each side in the width direction); the annular pad 2 has a rivet mounting hole 21 centered on each of its four sides; the sheet metal box 1 has countersunk riveting mounting holes 11 corresponding to the rivet mounting holes 21 on the annular pad 2, and press-fit screw holes 12 corresponding to the press-fit screws 22, around the maintenance window 10; after the press-fit screws 22 on the annular pad 2 are fitted with O-ring seals 3, they pass through the corresponding press-fit screw holes 12 on the sheet metal box 1, and countersunk pop rivets 4 are selected and placed in the countersunk riveting mounting holes 11 on the sheet metal box 1 and the rivet mounting holes 21 on the annular pad 2 (see...). Figures 4 to 6 As shown), the cover 6 is provided with an annular mounting edge 61 corresponding to the edge of the maintenance window 10. The annular sealing gasket 5 corresponds to the annular mounting edge 61 of the cover 6. The annular sealing gasket 5 is provided with a rivet screw through hole 52 corresponding to the rivet screw through hole 12 on the sheet metal housing 1. The annular mounting edge 61 of the cover 6 is provided with a rivet screw through hole 612 corresponding to the rivet screw through hole 12 on the sheet metal housing 1. The rivet screw 22 continues to pass through the rivet screw through hole 52 on the annular sealing gasket 5 and the rivet screw through hole 612 on the annular mounting edge 61 of the cover 6, and is then tightened with a nut 7 (see...). Figure 4 , Figure 5 and Figure 7(As shown).
[0025] In practical applications, the annular sealing gasket 5 is a rubber gasket; the O-ring 3 is an O-ring rubber ring.
[0026] In summary, the above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent variations and modifications made to the shape, structure, features and spirit described in the claims of the present utility model should be included within the scope of the claims of the present utility model.
Claims
1. A sealing structure for a maintenance window on a sheet metal enclosure, comprising: Located on the inner side of the maintenance window, with a corresponding window opening in its center, and a cover located on the outer side of the maintenance window that cooperates with it, the cover is characterized in that it is set on the outer side of the maintenance window by an annular sealing gasket, covering the maintenance window within it. The cover is specifically configured as follows: the annular gasket has a plurality of rivet screws arranged circumferentially, and at least two riveting mounting holes are also provided on the annular gasket; the sheet metal housing surrounds the maintenance window with countersunk riveting mounting holes corresponding to the riveting mounting holes on the annular gasket, and rivet screw holes corresponding one-to-one with the rivet screws; after O-rings are fitted onto the rivet screws on the annular gasket, they correspond one-to-one. The rivet passes through the corresponding press-fit screw holes on the sheet metal housing. A countersunk blind rivet is selected and installed in the countersunk riveting mounting holes on the sheet metal housing and the riveting mounting holes on the annular washer. The cover has an annular mounting edge corresponding to the edge of the maintenance window. The annular sealing gasket corresponds to the annular mounting edge of the cover. The annular sealing gasket has press-fit screw holes that correspond one-to-one with the press-fit screw holes on the sheet metal housing. The annular mounting edge of the cover has press-fit screw holes that correspond one-to-one with the press-fit screw holes on the sheet metal housing. The press-fit screw continues to pass through the press-fit screw holes on the annular sealing gasket and the annular mounting edge of the cover, and is then tightened with a nut.
2. The sealing structure of the maintenance window on the sheet metal enclosure according to claim 1, characterized in that: The maintenance window has a square arrangement, and correspondingly, the window in the middle of the annular pad has a rectangular arrangement. The annular pad has at least one riveting hole on each of its four sides.
3. The sealing structure of the maintenance window on the sheet metal enclosure according to claim 2, characterized in that: The annular pad has a rivet mounting hole centered on each of its four sides.
4. The sealing structure of the maintenance window on the sheet metal enclosure according to claim 2, characterized in that: The maintenance window has a rectangular arrangement, and correspondingly, the window in the middle of the annular pad also has a rectangular arrangement. The number of rivet screws on the annular pad in the length direction is greater than the number of rivet screws in the width direction.
5. The sealing structure of the maintenance window on the sheet metal enclosure according to any one of claims 1 to 4, characterized in that: The annular sealing gasket is a rubber gasket.
6. The sealing structure of the maintenance window on the sheet metal enclosure according to any one of claims 1 to 4, characterized in that: The O-ring is an O-ring rubber ring.
7. The sealing structure of the maintenance window on the sheet metal enclosure according to claim 5, characterized in that: The O-ring is an O-ring rubber ring.