Vertical cable grounding box

Abstract

The invention relates to the technical field of cable grounding equipment, and discloses a vertical cable grounding box which comprises a box body and a cover body, an opening of the box body faces downwards, a closed space is formed in the box body and the cover body after the box body and the cover body are combined, an annular baffle is arranged on the inner side face of the cover body, and the annular baffle is higher than the highest position of the connecting face of the cover body and the box body. When waterlogging occurs, the bottom of the box body is located below the water surface, air in the box body can prevent water from entering the box body, and the pressure difference between water pressure and air pressure in the box body and sealing connection between the box body and the cover body jointly form a first sealing protection structure. If a small part of water enters the box body, the pressure difference is matched with the annular baffle to form a second sealing protection structure; the structure can provide a stable sealing effect, so that the vertical cable grounding box provided by the invention can better adapt to severe environments such as rainfall, waterlogging and the like, the safety of electrical devices in the box is ensured, and the long-term safe and stable operation of a power cable metal sheath grounding system is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cable grounding equipment, and in particular to a vertical cable grounding box. Background Art

[0002] Cable lines are the mainstream choice for power transmission and distribution line networks in urban areas. Their metal sheaths need to be grounded at specific locations through cable grounding boxes. Cable grounding boxes are mainly divided into direct grounding boxes, protective grounding boxes, three-phase cross-interconnected grounding boxes and three-phase six-wire grounding boxes. The internal copper bus and connecting plate are connected to the coaxial cable or grounding wire leading out of the metal sheath by bolts. The external box cover is usually fixed to the box body from the front view by bolts, and a sealing ring is placed between the box cover and the box body to enhance its waterproof sealing performance.

[0003] However, there are still some problems in the construction of existing cable grounding boxes. For example, if the sealing ring is not installed in a suitable position, the bolt tightening torque is insufficient or inconsistent, no protective measures are taken when installing the metal sheath to lead out the coaxial cable or grounding wire, or foreign matter or dirt is introduced when it is opened for inspection during operation and maintenance, the waterproof sealing performance of the grounding box will be reduced. At this time, once the groundwater level in the attached well rises due to rainfall, waterlogging and other reasons, water is very easy to enter the grounding box. Water entering the box will cause premature degradation and damage of the protector, imbalance of the cross-connection system, increase of copper bus contact resistance, rust and breakage of connecting screws, and even damage to the cable due to the suspended voltage of the single-ended grounding system, and moisture intrusion into the cable joint along the coaxial cable, causing serious operational hazards and high safety risks, which cannot meet the needs of safe operation. Summary of the invention

[0004] The invention provides a vertical cable grounding box, which solves the technical problem that the existing cable grounding box has poor waterproof sealing performance and leads to high safety risks.

[0005] The present invention provides a vertical cable grounding box, comprising: a box body and a cover body;

[0006] The opening of the box body faces downward;

[0007] After the box body and the cover body are combined, a closed space is formed inside the box body;

[0008] The cover body is provided with an annular baffle on its surface facing the enclosed space, and the annular baffle is higher than the highest point of the connection surface between the cover body and the box body;

[0009] A threading opening for threading cables is provided in the area surrounded by the annular baffle on the cover body;

[0010] A first sealing structure is provided between the wire threading opening and the cable.

[0011] Optionally, the height of the annular baffle is not less than 1 cm;

[0012] The outer side wall of the annular baffle is seamlessly fitted with the inner wall of the box body.

[0013] Optionally, the vertical cable grounding box further includes a bracket;

[0014] The bracket is fixedly connected to the bottom of the cover body, and the bracket is used to support the whole formed by the combination of the cover body and the box body;

[0015] The inclination angle of the whole formed by the combination of the box body and the cover body to the horizontal plane does not exceed 5°.

[0016] Optionally, the vertical cable grounding box further comprises an electrical component for connecting the coaxial cable and the grounding wire;

[0017] The electrical components are arranged in the confined space;

[0018] The coaxial cable and the ground wire are connected to the electrical component through the wire threading opening;

[0019] The number of the threading holes is equal to the sum of the number of the coaxial cables and the number of the grounding wires.

[0020] Optionally, the vertical cable grounding box further comprises a sheath overvoltage protector connected between the electrical component and the grounding wire.

[0021] Optionally, the vertical cable grounding box further includes a fixing assembly;

[0022] The fixing assembly includes a first positioning plate, a second positioning plate and two supporting plates;

[0023] The two support plates are vertically arranged on the surface of the cover body facing the enclosed space;

[0024] The first positioning plate and the second positioning plate are arranged between the two supporting plates;

[0025] The coaxial cable and the electrical component are fixedly connected to the first positioning plate, and the electrical component and the grounding wire are fixedly connected to the second positioning plate.

[0026] Optionally, the first positioning plate and the second positioning plate are both provided with a latch structure at their connection with the support plate;

[0027] Both support plates are provided with plug holes matched with the latch structure.

[0028] Optionally, a connecting plate is provided on the outer edge of the opening of the box body;

[0029] The connecting plate is provided with a plurality of first mounting holes;

[0030] The cover body is provided with a plurality of second mounting holes corresponding one to one with the first mounting holes;

[0031] Bolts are inserted into the first mounting hole and the corresponding second mounting hole;

[0032] The cover body and the box body are fixedly connected by the bolts.

[0033] Optionally, a sealing gasket is provided at the connection between the box body and the cover body.

[0034] Optionally, a handle is provided on the outer wall of the box.

[0035] It can be seen from the above technical solutions that the present invention has the following advantages:

[0036] The present invention provides a vertical cable grounding box, comprising a box body and a cover body, wherein the opening of the box body faces downward, and a closed space is formed inside the box body after the box body and the cover body are combined, and an annular baffle is arranged on the surface of the cover body facing the closed space, and the annular baffle is higher than the highest point of the connection surface between the cover body and the box body, and a threading opening for threading cables is opened in the area surrounded by the annular baffle on the cover body, and a first sealing structure is arranged between the threading opening and the cable. In actual applications, when flooding occurs, the bottom of the box will be below the water surface, but the air in the box will prevent water from entering the box. The pressure difference between the water pressure and the air pressure in the box and the sealed connection between the box and the cover together constitute the first sealing protection structure of the cable grounding box; even if a small amount of water enters the interior of the box, the annular baffle plate arranged on the inner side of the cover can also play a blocking role, and the pressure difference and the annular baffle plate cooperate to constitute the second sealing protection structure of the cable grounding box; the aforementioned sealing protection structure can provide a stable sealing effect. Under multiple sealing protections, the vertical cable grounding box provided by the present invention can better adapt to harsh environments such as rainfall and waterlogging, and ensure the safety of electrical components in the box, thereby effectively ensuring the long-term safe and stable operation of the metal sheath grounding system of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 An exploded schematic diagram of the overall structure of a vertical cable grounding box provided by an embodiment of the present invention, wherein the electrical components are electrically interconnected by protective grounding;

[0039] Figure 2 A schematic structural diagram of a vertical cable grounding box provided in an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the structure of a cover body and a bracket provided in an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the structure of an electrical component that is electrically interconnected by a cross-connection method is provided in an embodiment of the present invention.

[0042] Explanation of the markings in the figure: 1-box body; 2-cover body; 3-support plate; 4-first positioning plate; 5-second positioning plate; 6-conductive connecting piece; 7-connecting plate; 8-sealing gasket; 9-handle; 10-bracket; 11-annular baffle; 12-second fixing piece; 13-coaxial cable threading port; 14-coaxial cable; 15-sheath overvoltage protector; 16-first fixing piece; 17-grounding wire; 18-grounding wire threading port. DETAILED DESCRIPTION

[0043] The embodiment of the present invention provides a vertical cable grounding box, which is used to solve the technical problem that the existing cable grounding box has poor waterproof sealing performance and leads to high safety risks.

[0044] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; “multiple” means two or more; in addition, the terms “first”, “second” and “third” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] See also Figure 1 to Figure 2 , a vertical cable grounding box provided by an embodiment of the present invention comprises: a box body 1 and a cover body 2;

[0048] The opening of the box body 1 faces downward;

[0049] After the box body 1 and the cover body 2 are combined, a closed space is formed inside the box body 1;

[0050] An annular baffle 11 is provided on the surface of the cover body 2 facing the enclosed space, and the annular baffle 11 is higher than the highest point of the connection surface between the cover body 2 and the box body 1;

[0051] A threading opening for threading cables is provided in the area surrounded by the annular baffle 11 on the cover body 2;

[0052] A first sealing structure is provided between the wire threading opening and the cable.

[0053] It is understandable that if Figure 1 As shown, the box body 1 is opened and inverted downward, and its top surface and side surfaces are seamlessly connected, and can be made by welding, gluing, integrated molding, etc.; at the same time, the threading holes are all set on the cover body 2, and this design also ensures the seamlessness of the box body 1; the cover body 2 is located below the box body 1, and the cover body 2 and the box body 1 are sealed. A second sealing structure can be provided at the connection between the cover body 2 and the box body 1, so that after they are connected and combined, a closed space can be formed inside the box body 1. The second sealing structure can be a sealing ring, a sealing gasket, etc.; as shown in FIG. Figure 1 and 3As shown, the annular baffle 11 is arranged in a circle on the inner side of the cover body 2, that is, after the box body 1 and the cover body 2 are combined, the annular baffle 11 is located inside the box body 1; due to repeated disassembly and assembly of the grounding box or other misoperation, the seal between the box body 1 and the cover body 2 is prone to failure, so that when the water level exceeds the highest point of the connection surface between the box body 1 and the cover body 2, water may penetrate through the connection, and the annular baffle 11 is higher than the highest point of the connection surface between the cover body 2 and the box body 1, which can block the infiltrated water; because under the action of the pressure difference, the water level in the box body 1 can only rise to a certain height, after experiments and practical experience, it is known that the height of the annular baffle 11 should not be less than 1 cm; further, the outer wall of the annular baffle 11 can be seamlessly fitted with the inner wall of the box body 1 to strengthen the blocking of water infiltrating from the connection between the box body 1 and the cover body 2; or a third sealing structure, such as a sealing ring, a sealing gasket, etc., is provided between the outer wall of the annular baffle 11 and the inner wall of the box body 1 to further improve the sealing effect between the box body 1 and the cover body 2.

[0054] In actual applications, when flooding occurs, the bottom of the box 1 will be below the water surface, but due to the pressure difference between the air pressure and the water pressure in the box 1, the air in the box 1 will prevent water from entering the box 1, and the pressure difference and the sealed connection between the box 1 and the cover 2 together constitute the first sealing protection structure of the cable grounding box; even if a small amount of water enters the interior of the box 1, due to the pressure difference, the water level in the box 1 can only reach a certain height. At this time, the annular baffle 11 arranged on the inner side of the cover 2 can play a blocking effect, and the pressure difference and the annular baffle 11 cooperate to constitute the second sealing protection structure of the cable grounding box; the aforementioned sealing protection structure can provide a stable sealing effect. Under multiple sealing protections, the vertical cable grounding box provided in this embodiment can better adapt to harsh environments such as rainfall and waterlogging, and ensure the safety of electrical components in the box, thereby effectively ensuring the long-term safe and stable operation of the metal sheath grounding system of the power cable.

[0055] It should be noted that the cables include cables (coaxial cables 14) for connecting to the metal sheath of the cable line to be grounded and cables (grounding wires 17) for connecting to the earth; the first sealing structure arranged between the threading port and the cable can be a sealing ring (O-ring), a bubble glue layer, a heat shrink tube, a potting layer or other sealing structures, and can also be used in conjunction with a waterproof tape to further improve the waterproof performance; in order to reduce the difficulty of sealing, the number of threading ports is preferably the same as the number of cables, and multiple cables are arranged in different threading ports one by one, and a first sealing structure is arranged at each threading port.

[0056] In a specific embodiment, the vertical cable grounding box provided by the present invention further includes an electrical component for connecting the coaxial cable 14 and the grounding wire 17;

[0057] The electrical components are arranged in a closed space in the box body 1, and can be fixed in the box body 1 by fixing parts;

[0058] One end of the coaxial cable 14 is connected to the metal sheath of the cable line to be grounded, and the other end passes through the threading port into the enclosed space, and both the inner conductor and the outer conductor are connected to the electrical component; one end of the grounding wire 17 is connected to the electrical component in the enclosed space, and the other end passes through the threading port and is connected to the grounding terminal on the earth;

[0059] The number of threading openings is equal to the sum of the number of coaxial cables 14 and the number of grounding wires 17; the threading openings may specifically include coaxial cable threading openings 13 and grounding wire threading openings 18, wherein the number of coaxial cable threading openings 13 and the number of coaxial cables 14 are both equal to the number of phases of the cable line to be grounded, the number of grounding wire threading openings 18 and the number of grounding wires 17 are the same, the opening position of the coaxial cable threading opening 13 corresponds to the fixed position of the coaxial cable 14 on the first positioning plate 4, and the opening position of the grounding wire threading opening 18 corresponds to the fixed position of the grounding wire 17 on the second positioning plate 5.

[0060] In this embodiment, the electrical assembly is used to connect the inner conductors and outer conductors of the plurality of coaxial cables 14 to the ground wire 17, and may include: Figure 1 and Figure 4 The conductive connector 6 shown in the figure can be made of copper bar, aluminum bar or steel bar, etc., preferably copper bar. The specific number of the conductive connector 6 needs to be selected according to the interconnection method of the electrical components and the number of phases of the cable line to be grounded; the staff can adjust the interconnection method of the electrical components in the grounding box according to actual needs, such as cross interconnection (see Figure 4 ), protective grounding (see Figure 1 ) and direct grounding and other electrical interconnection methods; further, when the electrical components are connected by cross-connection or protective grounding electrical interconnection methods, a sheath overvoltage protector 15 should be connected between the electrical components and the grounding wire 17.

[0061] In a preferred implementation of the above specific embodiment, please refer to Figure 1 As shown, the vertical cable grounding box provided by the present invention also includes a fixing assembly that is easy to install and disassemble, and the fixing assembly includes a first positioning plate 4, a second positioning plate 5 and two support plates 3;

[0062] The two support plates 3 are vertically arranged on the surface of the cover body 2 facing the enclosed space, specifically, in the area surrounded by the annular baffle 11; two second fixing members 12 corresponding to the two support plates 3 can be fixedly arranged on the surface of the cover body 2 facing the enclosed space and the area surrounded by the annular baffle 11, and the second fixing members can be L-shaped plates with screw holes, and the two second fixing members 12 and the two support plates 3 are fixedly connected by bolts;

[0063] The first positioning plate 4 and the second positioning plate 5 are arranged between the two support plates 3; in a specific embodiment, the first positioning plate 4 is provided with a latch structure at a position connected to the support plate 3, and the second positioning plate 5 is provided with a latch structure at a position connected to the support plate 3, and both support plates 3 are provided with a socket adapted to the latch structure, and the latch structure and the socket constitute a plug-in connection structure, which can clamp the first positioning plate 4 and the second positioning plate 5 with the two support plates 3;

[0064] The coaxial cable 14 and the electrical components are connected by Figure 4 The first fixing member 16 shown is fixedly connected to the first positioning plate 4, and the electrical component and the grounding wire 17 are fixedly connected to the second positioning plate 5; the second positioning plate 5 may be provided with a conductive channel connecting the electrical component and the grounding wire 17; when the sheath overvoltage protector 15 is installed, the first end of the conductive connector 6 in the electrical component is connected to the first positioning plate 4, the first end of the sheath overvoltage protector 15 is connected to the second end of the conductive connector 6 in the electrical component, and the second end of the sheath overvoltage protector 15 is fixedly connected to the second positioning plate 5.

[0065] In a preferred embodiment, Figure 1 and Figure 3 As shown, the vertical cable grounding box provided by the present invention further includes a bracket 10;

[0066] The bracket 10 is fixedly connected to the bottom of the cover body 2, and the fixed connection method can be bolt connection, welding, riveting, snap connection, etc.;

[0067] The bracket 10 is used to support the whole formed by the cover body 2 and the box body 1, and the support or connection point should avoid the position where the threading hole is opened;

[0068] The inclination angle of the whole formed by the box body 1 and the cover body 2 to the horizontal plane does not exceed 5°.

[0069] It should be noted that, according to measurements, in order to ensure the water-blocking effect of the air pressure inside the box 1, it is not recommended to tilt the cable grounding box as a whole. If the tilt angle exceeds 5°, it is easy to cause the pressure difference waterproofing to fail and water to flood.

[0070] To ensure the stability of the connection between the box body 1 and the cover body 2, in a preferred embodiment, Figure 1 or Figure 3 As shown, a connecting plate 7 is fixedly provided at the outer edge of the opening of the box body 1, that is, a connecting plate 7 is fixedly provided around the opening of the box body 1, and the fixing method is preferably welding;

[0071] A plurality of first mounting holes are provided on the connecting plate 7;

[0072] The cover body 2 is provided with a plurality of second mounting holes corresponding to the first mounting holes one by one, and the size of the second mounting holes matches the size of the first mounting holes;

[0073] Each first mounting hole and the corresponding second mounting hole can be penetrated by a bolt after being aligned;

[0074] The cover body 2 is fixedly connected to the box body 1 by bolts passing through the first mounting hole and the second mounting hole;

[0075] An annular sealing gasket 8 may be provided between the connecting plate 7 and the cover body 2 .

[0076] In a preferred embodiment, see Figure 1 A handle 9 is provided on the outer wall of the box body 1 to facilitate the staff to grab the box body 1 when installing the cable grounding box.

[0077] When installing Figure 1 When using the vertical cable grounding box shown, the bracket 10 can be installed first, and then the cover body 2 can be fixedly installed on the bracket 10; then each cable is passed through the corresponding threading port in sequence according to the preset phase and function, and the threading port is filled and tightly sealed with waterproof sealant and waterproof insulating tape or other sealing structures; then the fixing components are installed: the two support plates 3 are fixed to the corresponding second fixing members 12 respectively by bolts, and the pin structures on both sides of the first positioning plate 4 and the second positioning plate 5 are inserted into the corresponding jacks, and then the coaxial cable 14 and the conductive connector 6 of the electrical component are fixed to the first positioning plate 4 by the first fixing member 16, and according to actual needs, the interconnection method of the electrical components in the grounding box is adjusted, and the electrical components, the sheath overvoltage protector 15 and the grounding wire 17 are connected; finally, the sealing gasket 8 is placed on the connecting plate 7 of the cover body 2, and the box body 1 is installed in an inverted manner, and the connecting plate 7 of the box body 1 is aligned with the connecting hole on the cover body 2, and fixed with bolts to complete the installation.

[0078] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical cable grounding box, It is characterized in that include: Box body and cover body; The opening of the box body faces downward; After the box body and the cover body are combined, a closed space is formed inside the box body; The cover body is provided with an annular baffle on its surface facing the enclosed space, and the annular baffle is higher than the highest point of the connection surface between the cover body and the box body; A threading opening for threading cables is provided in the area surrounded by the annular baffle on the cover body; A first sealing structure is provided between the wire threading opening and the cable.

2. The vertical cable grounding box according to claim 1, It is characterized in that The height of the annular baffle is not less than 1 cm; The outer side wall of the annular baffle is seamlessly fitted with the inner wall of the box body.

3. The vertical cable grounding box according to claim 1, It is characterized in that Also includes a stand; The bracket is fixedly connected to the bottom of the cover body, and the bracket is used to support the whole formed by the combination of the cover body and the box body; The inclination angle of the whole formed by the combination of the box body and the cover body to the horizontal plane does not exceed 5°.

4. The vertical cable grounding box according to claim 1, It is characterized in that Also included are electrical assemblies for connecting the coaxial cable and the ground wire; The electrical components are arranged in the confined space; The coaxial cable and the ground wire are connected to the electrical component through the wire threading opening; The number of the threading holes is equal to the sum of the number of the coaxial cables and the number of the grounding wires.

5. The vertical cable grounding box according to claim 4, It is characterized in that Also included is a sheath overvoltage protector connected between the electrical component and the ground wire.

6. The vertical cable grounding box according to claim 4, It is characterized in that Also included are fixing components; The fixing assembly includes a first positioning plate, a second positioning plate and two supporting plates; The two support plates are vertically arranged on the surface of the cover body facing the enclosed space; The first positioning plate and the second positioning plate are arranged between the two supporting plates; The coaxial cable and the electrical component are fixedly connected to the first positioning plate, and the electrical component and the grounding wire are fixedly connected to the second positioning plate.

7. The vertical cable grounding box according to claim 6, It is characterized in that The connection between the first positioning plate and the second positioning plate and the support plate is provided with a latch structure; Both support plates are provided with plug holes matched with the latch structure.

8. The vertical cable grounding box according to claim 1, It is characterized in that A connecting plate is provided at the outer edge of the opening of the box body; The connecting plate is provided with a plurality of first mounting holes; The cover body is provided with a plurality of second mounting holes corresponding one to one with the first mounting holes; Bolts are inserted into the first mounting hole and the corresponding second mounting hole; The cover body and the box body are fixedly connected by the bolts.

9. The vertical cable grounding box according to claim 1, It is characterized in that A sealing gasket is arranged at the connection between the box body and the cover body.

10. The vertical cable grounding box according to any one of claims 1 to 9, It is characterized in that A handle is arranged on the outer wall of the box body.

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