Protective cover
By setting two coaxially arranged sealing elements inside the cable well protective cover, a double seal is formed based on the principles of elastomer compression rebound and lip sealing, which solves the problem that existing cable well dust covers cannot waterproof and isolate sand and dust, and achieves a highly efficient sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG CONTWELL COMM TECH CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-08-04
AI Technical Summary
Existing cable well dust covers are ineffective at preventing water and dust from entering, leading to equipment malfunctions and component corrosion.
Two types of sealing elements are arranged coaxially inside the protective cover. Utilizing the principles of elastic body compression rebound and lip sealing, together with the fixed sealing element, a double seal is formed to prevent the intrusion of external impurities.
It achieves IP68 level protection, preventing the intrusion of dust, water, sand and other substances, and improving the sealing performance of the cable well.
Smart Images
Figure CN224591495U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power facility protection technology, specifically a protective cover. Background Technology
[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.
[0003] As a crucial component of power infrastructure, the sealing and protective performance of cable wells directly impacts the safe operation of cables and equipment within. Currently, conventional cable wells typically feature dust covers for double protection. Some cable wells also have pre-drilled functional holes in the main cover for purposes such as heat dissipation, maintenance, or installation of access control boxes; these functional holes are isolated from the external environment by dust covers. However, existing dust covers only provide dust protection; they are ineffective at preventing water damage and cannot completely block sand and dust intrusion. During long-term operation, due to insufficient protection, rainwater and sand can easily seep into the cable well, leading to equipment malfunctions and component corrosion. Utility Model Content
[0004] To address the technical problems mentioned above, this utility model provides a protective cover with two types of sealing elements arranged coaxially inside the cover. As the cover closes, the two sealing elements form a seal based on different sealing principles. Combined with the pre-reserved fixing seal inside the protective cover, the overall performance of the protective cover is improved, enabling it to block the intrusion of external dust, water, sand and other substances, thus meeting the IP68 protection requirements.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This utility model provides a protective cover, including an upper cover and a lower shell that are movably connected, with the lower shell connected to the manhole cover; the upper cover has a first protrusion and a second protrusion arranged in a ring and centered, a first sealing element is provided in the area between the first protrusion and the second protrusion, and a second sealing element is provided in the area enclosed by the second protrusion; the top of the lower shell has an annular protrusion, and a third sealing element is provided between the bottom of the lower shell and the manhole cover.
[0007] When the upper cover is fastened onto the lower shell, the annular protrusion of the lower shell is embedded between the first protrusion and the second protrusion and abuts against the first seal; the second seal extends into the interior of the annular protrusion, and the sealing lip of the second seal contacts the inner wall surface of the annular protrusion.
[0008] Furthermore, the upper cover is movably connected to the lower shell via a pin.
[0009] Furthermore, a torsion spring is provided on the pin shaft, and the torsion spring achieves automatic closure between the upper cover and the lower shell through its own elasticity.
[0010] Furthermore, the first seal is annular.
[0011] Furthermore, the first seal is located in the annular groove between the first protrusion and the second protrusion.
[0012] Furthermore, when the upper cover is fastened onto the lower shell, the annular protrusion of the lower shell is embedded in the annular groove, forming a space that restricts the deformation of the first seal.
[0013] Furthermore, the second seal includes a connecting area, a transition area, and a sealing area that are joined together. The connecting area is annular, with one side connecting to the upper cover and the other side serving as the transition area.
[0014] Furthermore, the transition zone is a hollow cylinder with its inner diameter gradually increasing from the connecting zone to the sealing zone.
[0015] Furthermore, the sealing area is annular and has a sealing lip on its outer edge. The outer diameter of the sealing lip matches the inner diameter of the annular protrusion on the lower shell. When the upper cover is fastened onto the lower shell, the sealing lip and the inner diameter of the annular protrusion are interference-fitted.
[0016] Furthermore, the lower shell is connected to the manhole cover by fasteners, which pass through the lower shell and the third seal before connecting to the manhole cover.
[0017] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:
[0018] 1. When the upper cover is fastened to the lower shell, external impurities attempt to enter the cable well through the gaps between the upper and lower shells, and between the lower shell and the manhole cover. For the gap between the upper and lower shells, the first seal, based on the principle of elastic compression-rebound sealing, blocks most of the impurities that may enter the cable well. The second seal, based on the principle of lip sealing, further blocks any remaining impurities. For the gap between the lower shell and the manhole cover, the third seal, based on the principle of elastic compression-rebound sealing, blocks any remaining impurities. By using two sealing elements within the upper cover, based on different sealing principles, a seal is formed. Combined with the third seal, the overall sealing performance of the protective cover is improved, effectively preventing the intrusion of external dust, water, and sand, meeting the IP68 protection rating requirements.
[0019] 2. Because the upper cover and lower shell need to be opened and closed frequently, and the preload required for sealing is provided by a torsion spring between the upper cover and lower shell rather than by fasteners, and the gap between the upper cover and lower shell is directly exposed to the external environment, double sealing is achieved through two sets of different types of seals. The lower shell, after installation with the manhole cover, is in a "non-opening / closing state," i.e., stationary, and the preload is provided by fasteners; therefore, one set of seals is sufficient.
[0020] 3. The first seal is based on the principle of elastic compression rebound sealing. After deformation, it generates continuous pressure on the contact surface with the annular protrusion / groove, blocking most of the penetration paths of dust and water, thus meeting the mechanical requirements for sealing. The fit between the annular groove and the protrusion forms a confined space, preventing the seal from being over-compressed (avoiding permanent deformation) or extruded. At the same time, the first / second protrusion precisely constrains the position of the seal, ensuring that the compression amount is controllable.
[0021] 4. When the upper cover is fastened onto the lower shell, the second seal, based on the lip seal principle, achieves a second seal through the interference fit between the edge of the sealing lip and the inside of the annular protrusion. The outer diameter of the sealing lip is slightly larger than the inner diameter of the annular protrusion (interference fit). During assembly, the lip is radially compressed, generating continuous contact pressure. Under pressure, the sealing lip deforms and presses tightly against the inner wall of the protrusion, filling the microscopic unevenness of the annular protrusion's inner wall surface and blocking the leakage path.
[0022] 5. The transition zone of the second seal is a hollow cylinder with an inner diameter that gradually increases from the connection zone to the sealing zone, forming a flexible support structure. This structure guides the sealing lip smoothly into the annular protrusion's inner cavity during assembly, preventing folding. Furthermore, under pressure, the elastic deformation generated by the tapered structure with its changing diameter absorbs axial displacement (compensating for manufacturing tolerances or vibration offsets). Simultaneously, considering potential pressure changes inside the cable well due to heat variations (such as cable heating or electrical component heating), the tapered structure pushes the sealing lip further outward when the pressure increases. This improves the fit between the sealing lip and the inner wall of the annular protrusion, thereby enhancing the sealing effect. Attached Figure Description
[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0024] Figure 1 This is a schematic diagram of the overall structure of the protective cover provided by this utility model;
[0025] Figure 2 This is a schematic diagram of the structure of the first sealing element installed in the inner cavity of the upper cover provided by this utility model;
[0026] Figure 3 This is a schematic diagram of the structure of the upper cover inner cavity with the second sealing element installed, provided by this utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the torsion spring installed on the pin shaft provided by this utility model;
[0028] Figure 5 This is a schematic diagram of the structure of the lower shell for mounting the third sealing element provided by this utility model;
[0029] Figure 6 This is a cross-sectional structural diagram of the protective cover provided by this utility model.
[0030] In the diagram: 1. Top cover, 101. First protrusion, 102. Second protrusion, 2. First seal, 3. Second seal, 4. Pin, 5. Torsion spring, 6. Lower shell, 7. Third seal, 8. Fixing screw, 9. Nut, 10. Manhole cover. Detailed Implementation
[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0032] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0033] As described in the background section, the dust cover on the manhole cover only provides dust protection and does not have waterproofing function, nor can it prevent sand and dust from entering. With the operation of the cable well, due to the inadequate protection, rainwater and sand and dust can easily enter the inside of the cable well, causing malfunctions and corrosion of internal components.
[0034] The following embodiment provides a protective cover in which two types of sealing elements are arranged coaxially inside the cover. As the cover is closed, the two sealing elements form a seal based on different sealing principles. Together with the fixed sealing element reserved inside the protective cover, the overall performance of the protective cover is improved, which can block the intrusion of external dust, water and sand and meet the protection requirements of IP68 level.
[0035] like Figures 1-5 As shown, a protective cover includes an upper cover 1 and a lower shell 6 that are movably connected, with the lower shell 6 connected to the manhole cover 10.
[0036] like Figures 2-3 As shown, the upper cover 1 has a first protrusion 101 and a second protrusion 102 arranged in a ring with the same center. The area between the first protrusion 101 and the second protrusion 102 is provided with a first sealing element 2, and the area enclosed by the second protrusion 102 is provided with a second sealing element 3.
[0037] like Figure 4 As shown, the upper cover 1 is movably connected to the lower shell 6 via a pin shaft 4. A torsion spring 5 is provided on the pin shaft 4, and the torsion spring 5 achieves automatic closure between the upper cover 1 and the lower shell 6 through its own elasticity.
[0038] like Figure 5 As shown, the top of the lower shell 6 is provided with an annular protrusion, and a third sealing element 7 is provided between the bottom of the lower shell 6 and the well cover 10.
[0039] In addition, considering the sealing effect, a slot can be set on the outer wall of the annular protrusion, and an elastic buckle can be set on the inner wall of the first protrusion 101 of the upper cover 1. The elastic buckle is used to lock into the slot to achieve the locking between the upper cover 1 and the lower shell 6.
[0040] like Figure 6 As shown, the lower shell 6 is connected to the reserved hole of the manhole cover 10 by fixing screws 8, and the upper cover 1 is fastened to the lower shell 6 to form a complete protective cover.
[0041] like Figure 6 As shown, the upper cover 1 is fastened to the lower shell 6, and the upper cover 1 generates a pre-tightening force on the first seal 2. At the same time, the second seal 3 extends into the interior of the lower shell 6, and the fixing screw 8 passes through the lower shell 6 and the third seal 7 and is connected to the manhole cover 10.
[0042] The first sealing element 2 is annular and is located in an annular groove between the first protrusion 101 and the second protrusion 102 on the inner surface of the upper cover 1.
[0043] When the upper cover 1 is fastened onto the lower shell 6, the annular protrusion of the lower shell 6 is embedded in the groove, forming a space that restricts the deformation of the first seal 2. The upper cover 1 generates a pre-tightening force on the first seal 2, causing the first seal 2 to undergo elastic deformation. The elasticity of the first seal 2 restores its shape by resisting the pre-tightening force, thereby filling the "space that restricts the deformation of the first seal 2" and forming the first seal of the protective cover.
[0044] The first seal 2 is based on the principle of "elastic compression rebound sealing". After deformation, it generates continuous pressure on the contact surface with the annular protrusion / groove, blocking most of the penetration paths of dust and water, and meeting the mechanical conditions for sealing.
[0045] The engagement of the annular groove and the protrusion creates a confined space, preventing the seal from being over-compressed (avoiding permanent deformation) or extruded. At the same time, the first / second protrusion (101 / 102) precisely constrains the position of the seal, ensuring that the amount of compression is controllable.
[0046] In this embodiment, the first sealing element 2 is an annular rubber sealing gasket.
[0047] The second seal 3 is located within the area enclosed by the second protrusion 102, including a connecting area and a sealing area at both ends of the transition area. The connecting area is annular, with one side connected to the upper cover 1 by adhesive bonding, and the other side being the transition area. The transition area is a hollow cylinder, with its inner diameter gradually increasing from the connecting area to the sealing area. The sealing area has an annular sealing lip, the outer diameter of which matches the inner diameter of the annular protrusion of the lower shell 6, ensuring an interference fit by making the outer diameter of the sealing lip slightly larger than the inner diameter of the annular protrusion.
[0048] When the upper cover 1 is fastened onto the lower shell 6, the sealing area and the transition area extend into the interior of the annular protrusion of the lower shell 6. The edge of the sealing lip contacts the inner wall surface of the annular protrusion. Based on the lip seal principle, a second seal is achieved by the edge of the sealing lip and the interior of the annular protrusion making an interference fit contact.
[0049] The outer diameter of the sealing lip is slightly larger than the inner diameter of the annular protrusion (interference fit). During assembly, the lip is radially compressed, generating continuous contact pressure. The sealing lip is made of a highly elastic material (such as silicone or TPU). After being compressed, it deforms and adheres tightly to the inner wall of the protrusion, filling the microscopic unevenness of the inner wall surface of the annular protrusion and blocking the leakage path.
[0050] The transition zone is a hollow cylinder with an inner diameter that gradually increases from the connection zone to the sealing zone, forming a flexible support structure. This structure guides the sealing lip smoothly into the annular protrusion's inner cavity during assembly, preventing it from folding over. It also absorbs axial displacement under pressure through the elastic deformation of the conical structure (compensating for manufacturing tolerances or vibration offsets). Simultaneously, considering potential pressure changes inside the cable well due to heat variations (such as cable heating or electrical component heating), when the pressure increases, it pushes the sealing lip further outward (similar to the "self-tightening seal" of a hydraulic seal), improving the fit between the sealing lip and the inner wall of the annular protrusion, thereby enhancing the sealing effect.
[0051] In this embodiment, the second sealing element 3 is a silicone rubber sealing gasket.
[0052] The third seal 7 is annular with holes on its surface to accommodate fasteners. The gap between the lower shell 6 and the well cover 10 is reduced by the fixing screw 8, thereby compressing the third seal 7. The principle is the same as that of the first seal 2, and the seal is also achieved based on the principle of "elastic compression rebound sealing".
[0053] When the upper cover 1 is fastened to the lower shell 6, external impurities attempt to enter the cable well through the gap between the upper cover 1 and the lower shell 6, as well as the gap between the lower shell 6 and the manhole cover 10. The gap between the lower shell 6 and the manhole cover 10 is lower in height and more susceptible to water intrusion, while the gap between the upper cover 1 and the lower shell 6 is higher in position and more susceptible to dust and rainwater intrusion.
[0054] For the gap between the upper cover 1 and the lower shell 6, the first seal 2, based on the principle of elastic compression rebound sealing, blocks most of the impurities that may enter the cable well. The second seal 3, based on the principle of lip sealing, further blocks impurities that may enter the cable well. Since the upper cover 1 and the lower shell 6 need to be opened and closed frequently, and the preload required for sealing is provided by the torsion spring 5 between the upper cover 1 and the lower shell 6 rather than by a separate fastener, and the gap between the upper cover 1 and the lower shell 6 is directly exposed to the external environment, a double seal was designed.
[0055] For the gap between the lower shell 6 and the manhole cover 10, the third sealing element 7 uses the principle of elastic compression and rebound sealing to block impurities that may invade the cable well. After installation, the lower shell 6 and the manhole cover 10 are in a "non-opening and closing state", that is, in a stationary state, and are pre-tightened by fasteners. A set of sealing elements is sufficient to meet the requirements.
[0056] By setting two types of sealing elements coaxially arranged inside the top cover, the two sealing elements form a seal based on different sealing principles as the top cover is closed. Together with the fixed sealing parts reserved inside the protective cover, the overall performance of the protective cover is improved, which can block the intrusion of external dust, water and sand and meet the protection requirements of IP68 level.
[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A protective cover, characterized in that, It includes an upper cover and a lower shell that are movably connected, with the lower shell connected to the manhole cover; the upper cover has a first protrusion and a second protrusion arranged in a ring shape with the same center inside, a first sealing element is provided in the area between the first protrusion and the second protrusion, and a second sealing element is provided in the area enclosed by the second protrusion; the top of the lower shell has a ring protrusion, and a third sealing element is provided between the lower shell and the manhole cover. When the upper cover is fastened onto the lower shell, the annular protrusion of the lower shell is embedded between the first protrusion and the second protrusion and abuts against the first seal; the second seal extends into the interior of the annular protrusion, and the sealing lip of the second seal contacts the inner wall surface of the annular protrusion.
2. A protective cover as claimed in claim 1, wherein, The upper cover is movably connected to the lower shell via a pin.
3. A protective cover as claimed in claim 2, wherein, The pin shaft is equipped with a torsion spring, which achieves automatic closure between the upper cover and the lower shell through its own elasticity.
4. A protective cover as defined in claim 1, wherein, The first seal is annular.
5. A protective cover as claimed in claim 4, wherein, The first seal is located in the annular groove between the first protrusion and the second protrusion.
6. A protective cover as defined in claim 1, wherein, When the upper cover is fastened onto the lower shell, the annular protrusion of the lower shell is embedded in the annular groove, forming a space that restricts the deformation of the first sealing element.
7. A protective cover as defined in claim 1, wherein, The second seal includes a connecting area, a transition area, and a sealing area connected together. The connecting area is annular, with one side connected to the upper cover and the other side being the transition area.
8. A protective cover as claimed in claim 7, wherein, The transition zone is a hollow cylinder with an inner diameter that gradually increases from the connecting zone to the sealing zone.
9. A protective cover as defined in claim 7, wherein, The sealing area is annular and has a sealing lip on its outer edge. The outer diameter of the sealing lip matches the inner diameter of the annular protrusion on the lower shell. When the upper cover is fastened onto the lower shell, the sealing lip and the inner diameter of the annular protrusion are interference-fitted.
10. A protective cover as defined in claim 1, wherein, The lower shell is connected to the manhole cover by fasteners, which pass through the lower shell and the third seal and are then connected to the manhole cover.