Cable grounding box used in chemical engineering area

Abstract

The utility model discloses a cable grounding box used in a chemical industry area, comprising an inner box provided with an inner box cover and an inner box body, the inner box body and the inner box cover are fixed through bolts, the side surface of the inner box body is provided with a wire pipe for a cable to go in and out, and the tail end of the wire pipe is provided with a sealing joint. The inner box cover is provided with an observation hole and a hygrothermograph used for displaying the temperature and humidity in the cable grounding box, the inner box cover and the inner box body are a corrosion-resistant inner box cover and a corrosion-resistant inner box body, a corrosion-resistant outer box is arranged outside the inner box, the inner box is detachably fixed in the corrosion-resistant outer box, a sealing gasket is arranged between the corrosion-resistant inner box cover and the corrosion-resistant inner box body, and the inner box cover and the corrosion-resistant inner box body are arranged in the corrosion-resistant outer box. The corrosion-resistant outer box comprises a corrosion-resistant outer box body and a corrosion-resistant outer box cover convenient to open and close, a cable hole is formed in the side face of the corrosion-resistant outer box body, the wire pipe penetrates out of the corrosion-resistant outer box body from the cable hole, and a sealing plug is arranged between the cable hole and the wire pipe.

Description

Technical Field

[0001] The utility model relates to a cable grounding box, in particular to a cable grounding box used in a chemical industry area. Background Art

[0002] The conductor of a high-voltage power cable is the primary winding, and the cable metal sheath is the secondary winding. When an alternating current is generated in the conductor, an alternating electric field will generate an induced voltage on the cable metal sheath. Generally, to limit the induced voltage or fault overvoltage on the metal sheath of a single-core power cable and avoid the formation of a circulating current in the sheath, one end of the metal sheath of a short-distance power cable should be directly grounded, and the other end must be grounded through a protector. The cable grounding box is a special device for grounding the cable sheath. The cable grounding box is installed between the cable sheath and the ground, which can avoid the damage of lightning strikes and induced overvoltages to the cable sheath.

[0003] The conductor of a high-voltage power cable is the primary winding, and the cable metal sheath is the secondary winding. When an alternating current is generated in the conductor, an alternating electric field will generate an induced voltage on the cable metal sheath. Generally, to limit the induced voltage or fault overvoltage on the metal sheath of a single-core power cable and avoid the formation of a circulating current in the sheath, one end of the metal sheath of a short-distance power cable should be directly grounded, and the other end must be grounded through a protector. The cable grounding box is a special device for grounding the cable sheath. The cable grounding box is installed between the cable sheath and the ground, which can avoid the damage of lightning strikes and induced overvoltages to the cable sheath.

[0004] For example, CN214314388U provides a cable grounding box, which includes a box cover and a box body. A cable inlet and outlet pipe is arranged on the side of the box body. Outer edges are arranged around the top of the box body, and through holes for bolt-fixing the box cover are arranged on the outer edges; an observation hole and a thermometer and hygrometer for displaying the temperature and humidity inside the grounding box are arranged on the box cover. The observation hole is hollowed out and an concave lens is arranged inside; a sealing joint is arranged at the end of the pipe. This utility model is provided with an observation hole and a thermometer and hygrometer. During daily operation and maintenance, the internal condition and the temperature and humidity data inside the grounding box can be checked without opening the grounding box; it adopts a sealing design and has good waterproof, moisture-proof and dust-proof performances; it can avoid the damage of lightning strikes and induced overvoltages to the cable sheath, ensure the safe operation of the power line and improve the service life of the power cable. The disadvantage is that it is not suitable for chemical industry areas with higher requirements for sealing and corrosion resistance.

[0005] Due to the diversity of the power operation environment in the chemical industry area, higher requirements are put forward for cable earthing boxes. It is necessary to ensure good sealing performance, no water leakage, good insulation performance, and the earthing box shell material must be corrosion-resistant. At the same time, in order to facilitate maintenance personnel to know the internal situation of the earthing box in a timely manner, it is required that the earthing box has a simple structure, is easy to install, and the internal situation can be viewed in a timely manner without opening. Summary of the Invention

[0006] The purpose of the present utility model is to provide a cable earthing box used in the chemical industry area in view of the deficiencies of the prior art. The cable earthing box used in the chemical industry area of the present utility model has good insulation performance and corrosion resistance, high strength, simple structure, easy installation, can view the temperature and humidity data inside without opening the box, and at the same time has good connection performance and protection performance.

[0007] To solve the above problems, the technical solution adopted by the present utility model is: a cable earthing box used in the chemical industry area, including an inner box, the inner box includes an inner box cover and an inner box body, inner box edges are provided around the top of the inner box body, through holes for bolt-fixing the inner box cover are provided on the inner box edges, a wire pipe for the cable to enter and exit is provided on the side of the inner box body, a sealing joint is provided at the end of the wire pipe, an observation hole and a thermometer and hygrometer for displaying the temperature and humidity inside the cable earthing box are provided on the inner box cover, the inner box cover and the inner box body are corrosion-resistant inner box cover and corrosion-resistant inner box body, a corrosion-resistant outer box is provided outside the inner box, the inner box is detachably fixed inside the corrosion-resistant outer box, a sealing gasket is provided between the corrosion-resistant inner box cover and the corrosion-resistant inner box body, the corrosion-resistant outer box includes a corrosion-resistant outer box body and a corrosion-resistant outer box cover that is convenient to open and close, a cable hole is provided on the side of the corrosion-resistant outer box body, the wire pipe passes through the cable hole out of the corrosion-resistant outer box body, and a sealing plug is provided between the cable hole and the wire pipe.

[0008] As a preferred implementation of the present utility model, the observation hole is hollowed out, and a transparent mirror is provided inside the observation hole.

[0009] As a preferred implementation of the present utility model, a button is provided on the corrosion-resistant outer box cover, and a lock catch matching with the button is provided on the corrosion-resistant outer box body.

[0010] As a preferred implementation of the present utility model, fixing feet for installing the corrosion-resistant inner box body are provided at the bottom of the corrosion-resistant inner box body, and the fixing feet are fixedly connected to the corrosion-resistant outer box body by bolts.

[0011] As a preferred implementation of the present utility model, an inner box cover handle is provided on the corrosion-resistant inner box cover.

[0012] As a preferred embodiment of the present utility model, an inner box handle is provided on the corrosion-resistant inner box body.

[0013] As a preferred embodiment of the present utility model, a busbar and a sheath protector are provided inside the corrosion-resistant inner box body.

[0014] As a preferred embodiment of the present utility model, the corrosion-resistant inner box cover, the corrosion-resistant inner box body and the corrosion-resistant outer box are a stainless steel inner box cover, a stainless steel inner box body and a stainless steel outer box.

[0015] As a preferred embodiment of the present utility model, a corrosion-resistant protective layer is provided on the surfaces of the stainless steel inner box cover, the stainless steel inner box body and the stainless steel outer box.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. The present utility model adopts a corrosion-resistant double-layer box body design. A gasket is provided between the corrosion-resistant inner box cover and the corrosion-resistant inner box body. A sealing plug is provided between the cable hole and the wire pipe, and a sealing joint is provided at the end of the wire pipe, which can effectively prevent the internal components of the grounding box from being damaged by chemical corrosion and the erosion of rainwater, water vapor or dust, and has good corrosion resistance and sealing performance such as waterproof, moisture-proof and dust-proof.

[0018] 2. The inner box of the present utility model is detachably fixed inside the corrosion-resistant outer box. A button is provided on the corrosion-resistant outer box cover, and a lock catch cooperating with the button is provided on the corrosion-resistant outer box body, which can be easily opened and closed. An observation hole and a thermometer and hygrometer for displaying the temperature and humidity inside the cable grounding box are provided on the corrosion-resistant inner box cover. During the power operation and maintenance process, only the corrosion-resistant outer box cover needs to be opened, and there is no need to open the corrosion-resistant inner box cover to observe the internal condition of the grounding box without dead angles and view the temperature and humidity data inside the grounding box, enabling the maintenance personnel to know the internal situation in time and facilitating timely repair and maintenance.

[0019] 3. The present utility model can avoid the harm of lightning strikes and induced overvoltage to the cable sheath, ensure the safe operation of the power line, and improve the service life of the power cable; according to different internal connection methods, the present utility model can be adjusted to a direct grounding box, a protective grounding box or a cross-bonding grounding box, and can be applicable to various power cable systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the outer box body and the outer box cover of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the inner box of the present utility model.

[0022] Figure 3This is a schematic diagram of the inner box body and its internal structure of the present utility model.

[0023] In the figure: 1 - inner box cover, 2 - inner box body, 3 - sealing gasket, 4 - cable conduit, 5 - sheath protector, 6 - outer box body, 7 - sealing plug, 8 - busbar copper row, 11 - observation hole, 12 - inner box cover handle, 13 - temperature and humidity meter, 21 - inner box edge, 22 - fixing feet, 23 - inner box handle, 41 - sealing joint, 61 - outer box cover, 62 - button, 63 - lock, 64 - cable hole Specific embodiments

[0024] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described below with reference to the accompanying drawings and embodiments. The implementation modes of the present utility model include but are not limited to the following embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0025] As Figures 1 to 3 shown, the cable grounding box used in the chemical industry area of the present utility model includes an inner box composed of a corrosion-resistant inner box cover 1 and a corrosion-resistant inner box body 2. Inner box edges 21 are provided around the top of the inner box body 2. Through holes for bolt-fixing the inner box cover 1 are provided on the inner box edges 21. A cable conduit 4 for the cable to enter and exit is provided on the side of the inner box body 2. A sealing joint 41 is provided at the end of the cable conduit 4. A long strip-shaped observation hole 11 and a temperature and humidity meter 13 for displaying the temperature and humidity inside the cable grounding box are provided on the inner box cover 1. The observation hole 11 is provided with a hollow setting, and a transparent mirror is provided inside the observation hole 11, which can observe the internal condition of the inner box body 2 without dead angles. An inner box cover handle 12 is provided on the inner box cover 1, and an inner box handle 23 is provided on the inner box body 2. A sealing gasket 3 is provided between the inner box cover 1 and the inner box body 2. An outer box made of corrosion-resistant material is provided outside the inner box. The outer box includes a corrosion-resistant outer box body 6 and a corrosion-resistant outer box cover 61 that is convenient to open and close. A button 62 is provided on the outer box cover 61, and a lock 63 that cooperates with the button 62 is provided on the outer box body 6, which can be simply opened and closed. A cable hole 64 is provided on the side of the outer box body 6. The cable conduit 4 passes through the cable hole 64 and extends outside the outer box body 6. A sealing plug 7 is provided between the cable hole 64 and the cable conduit 4.

[0026] For the convenience of maintenance and repair, fixing feet 22 for installing the outer box body 6 are provided at the bottom of the inner box body 2. The fixing feet 22 are fixedly connected to the outer box body 6 by bolts, so that the inner box can be detachably fixed inside the outer box.

[0027] Inside the inner box body 2, there are a busbar copper row 8 and a sheath protector 5. After the metal sheaths of the three-phase power cables pass through the sheath protector 5 inside the cable grounding box, they are connected to each other through the busbar copper row 8, and then grounded through the grounding cable. One end of the grounding cable is connected to the busbar copper row 8, and the other end is grounded, which can avoid the damage of lightning strikes and induced overvoltages to the metal sheaths of the cables and ensure the safe operation of the power line.

[0028] In order to prevent the components inside the inner box body 2 from being damaged by rainwater or water vapor erosion, the inner box provided in this embodiment adopts a sealed structure. A sealing gasket 3 is provided between the inner box cover 1 and the inner box body 2. In specific implementation, the sealing gasket 3 can be made of a rubber gasket. To seal the internal gap left after the cable passes through the cable conduit 4, a sealing joint 41 is provided at the end of the cable conduit 4. A rubber cylinder is provided inside the sealing joint 41, and the rubber cylinder is sleeved on the cable. When the sealing joint 41 is tightened, the rubber cylinder can shrink and seal. The sealing joint 41 is threadedly connected to the cable conduit 4, and a sealing ring made of rubber material is also provided at the connection between the two. After the installation of the thermometer-hygrometer 13 and the transparent mirror in the observation hole 11 in this embodiment, the surrounding gaps are sealed with sealant or rubber rings.

[0029] In order to improve the anti-corrosion performance and the service life outdoors of the cable grounding box, the inner box cover 1, the inner box body 2, the outer box body 6, and the outer box cover 61 of the cable grounding box provided in this embodiment are all made of stainless steel material, treated with an anti-corrosion process, and a corrosion-resistant protective layer is provided on the surface. The cable conduit 4 and the sealing joint 41 are both made of stainless steel material, or can also be made of SMC composite material, which can effectively prevent the components inside the cable grounding box from being damaged by chemical substance corrosion and the erosion of rainwater, water vapor or dust, and has good corrosion resistance and sealing performance such as waterproof, moisture-proof and dust-proof.

Claims

1. A cable grounding box used in a chemical industry area, comprising an inner box, the inner box comprising an inner box cover and an inner box body, the inner box edge is arranged around the top of the inner box body, the inner box edge is provided with a through hole for bolting the inner box cover, the side of the inner box body is provided with a wire tube for cables to enter and exit, the end of the wire tube is provided with a sealing joint, the inner box cover is provided with an observation hole and a thermometer and hygrometer for displaying the temperature and humidity inside the cable grounding box, characterized in that: The inner box cover and the inner box body are corrosion-resistant inner box cover and corrosion-resistant inner box body, a corrosion-resistant outer box is arranged outside the inner box, the inner box is detachably fixed in the corrosion-resistant outer box, a sealing gasket is arranged between the corrosion-resistant inner box cover and the corrosion-resistant inner box body, the corrosion-resistant outer box includes a corrosion-resistant outer box body and a corrosion-resistant outer box cover for convenient switching, a cable hole is arranged on the side of the corrosion-resistant outer box body, the wire tube passes through the cable hole and out of the corrosion-resistant outer box body, and a sealing plug is arranged between the cable hole and the wire tube.

2. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The observation hole is hollowed out, and a transparent mirror is arranged inside the observation hole.

3. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The corrosion-resistant outer box cover is provided with a button, and the corrosion-resistant outer box body is provided with a lock buckle matched with the button.

4. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The bottom of the corrosion-resistant inner box is provided with fixing feet for installing the corrosion-resistant inner box, and the fixing feet are fixedly connected to the corrosion-resistant outer box by bolts.

5. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The corrosion-resistant inner box cover is provided with an inner box cover handle.

6. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The corrosion-resistant inner box body is provided with an inner box handle.

7. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The corrosion-resistant inner box is provided with a busbar and a sheath protector.

8. The cable grounding box used in the chemical industry area according to claim 1, characterized in that: The corrosion-resistant inner box cover, the corrosion-resistant inner box body and the corrosion-resistant outer box are stainless steel inner box cover, stainless steel inner box body and stainless steel outer box.

9. The cable grounding box used in the chemical industry area according to claim 8, characterized in that: The surfaces of the stainless steel inner box cover, the stainless steel inner box body and the stainless steel outer box are provided with corrosion-resistant protective layers.

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