Direct current lightning arrester box

Abstract

The utility model relates to the technical field of lightning arrester boxes, in particular to a direct-current lightning arrester box, which adopts the technical scheme that the direct-current lightning arrester box comprises a box body, windows are arranged on the front side and the rear side of the box body, a vertical column is fixedly mounted on the bottom surface of the inner wall of the box body, and a high-voltage cable gland and a grounding cable gland are arranged on the outer wall of one side, without the windows, of the box body. The high-voltage cable gland is arranged on the upper side of the outer wall of the box body in a penetrating mode, the grounding cable gland is arranged on the lower side of the outer wall of the box body in a penetrating mode, the lightning arrester is fixedly installed in the box body, the outer portion of the lightning arrester is an outer sleeve formed by encapsulating silicone rubber in an integrated die-casting mode, and the bottom of the lightning arrester is fixedly connected with the installation base. The direct-current lightning arrester has the advantages that the closed box body is additionally arranged on the direct-current lightning arrester, so that the lightning arrester operates in a relatively clean environment, dirt accumulation on the surface of the composite jacket umbrella skirt is prevented, the number of times of cleaning the lightning arrester umbrella skirt is reduced, and the phenomenon that the composite jacket umbrella skirt cannot be damaged when a vehicle runs can be prevented. And foreign matters jumping up from the ground damage the lightning arrester jacket. And meanwhile, the vehicle is convenient to wash, the flashover fault caused by creepage due to the wet surface of the lightning arrester umbrella skirt is avoided, the fault rate of the lightning arrester is greatly reduced, the operation reliability of the lightning arrester is improved, and the maintenance cost of the vehicle is also saved.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning arrester boxes, in particular to a DC lightning arrester box. Background Art

[0002] The DC lightning arrester box is a device used to protect the DC power system. It is mainly used to prevent damage to electrical equipment caused by lightning strikes, overvoltage, etc. It introduces overvoltage into the underground or other safe paths through grounding and shunting to protect the electrical equipment in the DC power system from damage by overvoltage and lightning strikes, maintain the safe operation of the system and the normal operation of the equipment, and plays an important role in protecting equipment and improving system stability and reliability.

[0003] The existing technology has the following deficiencies: a DC lightning arrester is installed at the bottom of the rail transit vehicle to prevent external lightning overvoltage and vehicle operation overvoltage from damaging the vehicle's electrical equipment, thereby improving the reliability of vehicle operation. However, the lightning arrester is installed at the bottom of the vehicle. When the vehicle is running, stones or foreign objects that bounce up from the ground or the track may damage the composite jacket of the lightning arrester, causing the arrester seal to fail. In severe cases, the lightning arrester may be punctured or even burned, and the fragments of internal impact may cause damage to the electrical equipment around the vehicle. In addition, when the DC lightning arrester is in operation, due to the electrostatic adsorption effect, when the surrounding environment is too dusty, it is easy for dirt to accumulate on the surface, requiring vehicle maintenance personnel to clean it regularly. When washing the car, the umbrella skirt is wet, which is easy to cause surface creeping flashover problems. The above problems have seriously reduced the reliability of the lightning arrester and vehicle operation, and increased the failure rate.

[0004] Therefore, it is necessary to invent a DC lightning arrester box. Utility Model Content

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a DC lightning arrester box, comprising a box body, wherein windows are provided on the front and rear sides of the box body, a column is fixedly installed on the bottom surface of the inner wall of the box body, and a high-voltage cable gland and a grounding cable gland are provided on the outer wall of the box body on the side without a window. The high-voltage cable gland is arranged on the upper side of the outer wall of the box body, and the grounding cable gland is arranged on the lower side of the outer wall of the box body. A lightning arrester is fixedly installed inside the box body, and the outside of the lightning arrester is an outer jacket formed by integral die-casting of encapsulated silicone rubber. The bottom of the lightning arrester is fixedly connected to a mounting base, and the top of the lightning arrester is provided with a high-voltage terminal.

[0006] Preferably, the arrester core adopts a DC metal oxide resistor as a main electrical component, the upper and lower ends of the arrester resistor are provided with hardware and buffer springs, and the outer wall of the arrester resistor is sheathed with an insulating tube.

[0007] Preferably, the arrester core body is coated with a special primer for the outer wall of the arrester core body, and the arrester core body is bonded to the silicone rubber composite jacket encapsulating the arrester outside by molding.

[0008] Preferably, the silicone rubber composite jacket encapsulating the outer wall of the arrester adopts an anti-fouling large and small umbrella design, and the silicone rubber composite jacket encapsulating the outer wall of the arrester can protect the arrester from being contaminated.

[0009] Preferably, a grounding terminal is provided on one side of the top surface of the mounting base, one end of the grounding cable passes through the grounding cable gland and is electrically connected to the grounding terminal through a gasket, a spring washer and a hexagonal nut, and one end of the high-voltage cable passes through the high-voltage cable gland and is electrically connected to the high-voltage terminal through a gasket, a spring washer and a hexagonal nut.

[0010] Preferably, the bottom surface of the mounting base is placed on the upper end of the column, and a threaded hole capable of inserting a bolt is provided on the upper end of the column, and the mounting base is fixedly connected to the column through a washer, a spring washer and a bolt.

[0011] Preferably, the four corners of the top surface of the box body are fixedly mounted with hanging ears, the hanging ears are in an L-shaped structure, and the top surface of the hanging ears is provided with a circular hole penetrating the hanging ears.

[0012] Preferably, the top surface of the hanging ear can be in close contact with the vehicle chassis, the hanging ear is fixedly connected to the vehicle chassis via a second bolt, and the box body is fixedly mounted on the vehicle chassis via the hanging ear and the second bolt.

[0013] The beneficial effects of the utility model are as follows: by adding a closed box to the DC lightning arrester, its IP protection level can reach IP65 level, which is dust-proof and water-proof; the lightning arrester is fixed in the box and is in a closed space, the air in the box is clean, and the surfaces of the composite jacket and the umbrella skirt are not easy to form dirt, which reduces the work intensity of vehicle maintenance personnel; when washing the car, due to the isolation of the closed box, water will not be sprayed onto the surface of the composite jacket of the lightning arrester in the box, and car washing is more convenient; because the box is made of stainless steel, which is a rigid material, when driving, stones or foreign objects jumping from the bottom and the guide rail will not damage the composite jacket of the lightning arrester in the box due to the protection of the box; when the lightning arrester breaks down due to overload or other unexpected factors and the lightning arrester burns out, the internal fragments of the lightning arrester may be ejected. Due to the isolation of the box, the harm is basically controlled in the area inside the box, and no harm is caused to the electrical equipment of the surrounding vehicles outside the box; through the above complete technical scheme, the reliability of the operation of the lightning arrester can be greatly improved, the failure rate can be reduced, and the vehicle maintenance cost can be saved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A front view of the DC lightning arrester box provided by the utility model;

[0015] Figure 2A side view of a DC lightning arrester box provided by the utility model;

[0016] Figure 3 This is a top view of the DC lightning arrester box provided by the utility model.

[0017] In the figure: vehicle chassis 3, box body 11, high-voltage cable gland 12, grounding cable gland 13, column 14, bolt 15, hanging ear 16, bolt 2 17, lightning arrester 21, high-voltage terminal 22, grounding terminal 23, mounting base 24. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] Example 1

[0020] like Figure 1-Figure 3 As shown, the DC lightning arrester box in the embodiment of the first aspect of the utility model includes a box body 11, and windows are provided on the front and rear sides of the box body 11. A column 14 is fixedly installed on the bottom surface of the inner wall of the box body 11, and a high-voltage cable gland 12 and a grounding cable gland 13 are provided on the outer wall of the box body 11 on the side without a window. The high-voltage cable gland 12 is arranged through the upper side of the outer wall of the box body 11, and the grounding cable gland 13 is arranged through the lower side of the outer wall of the box body 11. A lightning arrester 21 is fixedly installed inside the box body 11, and the outside of the lightning arrester 21 is an outer jacket formed by integral die-casting of encapsulated silicone rubber. The bottom of the lightning arrester 21 is fixedly connected to the mounting base 24, and the top of the lightning arrester 21 is provided with a high-voltage terminal 22.

[0021] In the above embodiment, it should be noted that the box body 11 is made of stainless steel, the box body 11 is sealed as a whole, a circle of sealing strips is arranged between the front and rear covers of the box body 11 and the frame of the box body 11, and the IP protection level of the box body 11 can reach IP65 level; a side panel of the box body is provided with a high-voltage and grounding cable gland and a special box protection grounding terminal, the high-voltage and grounding cable glands of the side panels of the box body 11 have rubber sealing sleeves inside, the cables pass through the glands and the inner holes of the sealing sleeves, and the outer wall of the sealing sleeves contacts the box body, which not only ensures the positioning of the cables, but also isolates the cable casing from the metal box plate, further improving the external insulation strength of the high-voltage cable; product nameplates are fixed on the front and rear covers of the box body 11, which are not constrained by different incoming line directions and are easy to install; the columns 14 are evenly arranged at the bottom of the inner wall of the box body 11, and the columns 14 have the function of fixing the mounting base 24, and the mounting base 24 is made of alloy aluminum. The silicone rubber jacket encapsulated on the outside of the arrester 21 has excellent dirt resistance and hydrophobicity, and can protect the arrester 21 in various harsh atmospheric environments.

[0022] Example 2

[0023] like Figure 1 As shown, the DC lightning arrester box includes all the contents of Example 1. In addition, the core of the lightning arrester 21 adopts a DC metal oxide resistor as the main electrical component, and the upper and lower ends of the core resistor of the lightning arrester 21 are provided with hardware and buffer springs. The outer wall of the core resistor of the lightning arrester 21 is covered with an insulating sleeve, and the outer wall of the core of the lightning arrester 21 is coated with a special primer liquid. The core of the lightning arrester 21 is molded and bonded to the silicone rubber composite jacket encapsulating the outside of the lightning arrester 21 by applying the primer liquid. The silicone rubber composite jacket encapsulating the outer wall of the lightning arrester 21 adopts an anti-fouling large and small umbrella design, and the silicone rubber composite jacket encapsulating the outer wall of the lightning arrester 21 can protect the lightning arrester 21 from contamination.

[0024] In the above embodiment, it should be noted that the resistor in the core of the lightning arrester 21 has excellent volt-ampere characteristics, presents a high resistance under normal working voltage, and only flows a very small microampere leakage current; when lightning and operation overvoltage occur in the system, it presents a low resistance, which is similar to a conductor, so as to conduct the surge current into the ground and reduce the overvoltage to the residual voltage value of the lightning arrester, thereby preventing the traction motor and vehicle equipment from being damaged by overvoltage, thereby providing reliable protection for the vehicle equipment. The insulating cylinder set on the outer wall of the resistor has a high mechanical strength. When the lightning arrester is overloaded and fails, it will not cause a vicious explosion. Through the hardware and buffer springs set at both ends of the resistor in the core of the lightning arrester 21, Avoid damage to the resistor caused by various impacts and vibrations, so as to protect the lightning arrester 21 from being easily damaged by vibration. Through the special primer liquid coated on the core of the lightning arrester 21, the silicone rubber composite jacket is bonded to the core of the lightning arrester 21 during molding, so as to achieve the control of eliminating breathing effect, avoid accidents caused by moisture in the lightning arrester, and improve the heat dissipation effect of the resistor. By adopting the silicone rubber composite jacket with anti-fouling large and small umbrella design, the pollution resistance and hydrophobicity of the lightning arrester can be improved, so as to ensure that the lightning arrester 21 can operate reliably in various harsh atmospheric environments.

[0025] Example 3

[0026] like Figure 1-Figure 3 As shown, the DC lightning arrester box includes all the contents of Example 1. In addition, a grounding terminal 23 is arranged on one side of the top surface of the mounting base 24, one end of the grounding cable passes through the grounding cable gland 13 and is electrically connected to the grounding terminal 23 through a gasket, a spring washer and a hexagonal nut, one end of the high-voltage cable passes through the high-voltage cable gland 12 and is electrically connected to the high-voltage terminal 22 through a gasket, a spring washer and a hexagonal nut, the bottom surface of the mounting base 24 is placed on the upper end of the column 14, and a threaded hole capable of inserting a bolt 15 is arranged on the upper end of the column 14, and the mounting base 24 is fixedly connected to the column 14 through a gasket, a spring washer and a bolt 15.

[0027] In the above embodiment, it should be noted that the lightning arrester 21 is connected to the high-voltage cable through the high-voltage terminal 22 and is connected to the grounding cable through the grounding terminal 23, so as to achieve the effect of timely conducting surge current into the ground and protecting the traction motor and vehicle equipment from damage by overvoltage.

[0028] Example 4

[0029] like Figure 1-Figure 3 As shown, the DC lightning arrester box includes all the contents of Example 1. In addition, the four corners of the top surface of the box body 11 are fixedly installed with ears 16, the ears 16 are L-shaped, and the top surface of the ears 16 is provided with a circular hole penetrating the ears 16. The top surface of the ears 16 can be tightly attached to the vehicle chassis 3. The ears 16 are fixedly connected to the vehicle chassis 3 by bolts 17, and the box body 11 is fixedly installed on the vehicle chassis 3 by the ears 16 and bolts 17.

[0030] In the above embodiment, it should be noted that the box body 11 is fixedly mounted on the vehicle chassis 3 through the hanging ears 16 and the bolts 17 .

[0031] The use process of the utility model is as follows: the technicians put the ear 16 on the top surface of the box 11 close to the vehicle chassis 3, use four bolts 17 to pass through the vehicle chassis 3 and the opening of the ear 16, put on washers, spring washers, hexagonal nuts in turn, and tighten them with a torque wrench, then pass one end of the grounding cable through the grounding cable gland 13 and electrically connect it to the grounding terminal 23 through washers, spring washers and hexagonal nuts, and pass one end of the high-voltage cable through the high-voltage cable gland 12 and electrically connect it to the high-voltage terminal 22 through washers, spring washers and hexagonal nuts. During use, the resistor in the lightning arrester 21 presents a high resistance value under normal working voltage, and only a very small micro-ampere leakage current flows; when lightning and operating overvoltage occur in the system, it presents a low resistance, which is similar to a conductor, so as to guide the surge current into the ground, and reduce the overvoltage to the residual voltage value of the lightning arrester, so as to avoid the traction motor and vehicle equipment from being damaged by overvoltage, thereby providing reliable protection for the vehicle equipment.

[0032] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A DC lightning arrester box, comprising a box body (11), wherein windows are provided on both the front and rear sides of the box body (11), a column (14) is fixedly installed on the bottom surface of the inner wall of the box body (11), and a high-voltage cable gland (12) and a grounding cable gland (13) are provided on the outer wall of the box body (11) on the side without the window, wherein the high-voltage cable gland (12) is arranged through the upper side of the outer wall of the box body (11), and the grounding cable gland (13) is arranged through the lower side of the outer wall of the box body (11), characterized in that: The lightning arrester (21) is fixedly installed inside the box (11), and the outside of the lightning arrester (21) is an outer shell encapsulated with silicone rubber and formed by integral die-casting. The bottom of the lightning arrester (21) is fixedly connected to the mounting base (24), and the top of the lightning arrester (21) is provided with a high-voltage terminal (22).

2. The DC lightning arrester box according to claim 1, characterized in that: The arrester (21) uses a DC metal oxide resistor as a main electrical component. The upper and lower ends of the resistor of the arrester (21) are provided with hardware and a buffer spring. The outer wall of the resistor of the arrester (21) is sheathed with an insulating tube.

3. The DC lightning arrester box according to claim 1, characterized in that: The outer wall of the core of the arrester (21) is coated with a special primer liquid, and the core of the arrester (21) is molded and bonded to the silicone rubber composite jacket that encapsulates the outside of the arrester (21) by coating the primer liquid.

4. The DC lightning arrester box according to claim 1, characterized in that: The silicon rubber composite jacket encapsulating the outer wall of the arrester (21) adopts an anti-fouling large and small umbrella design, and the silicon rubber composite jacket encapsulating the outer wall of the arrester (21) can protect the arrester (21) from being contaminated.

5. The DC lightning arrester box according to claim 1, characterized in that: A grounding terminal (23) is provided on one side of the top surface of the mounting base (24); one end of the grounding cable passes through the grounding cable gland (13) and is electrically connected to the grounding terminal (23) via a gasket, a spring washer and a hexagonal nut; one end of the high-voltage cable passes through the high-voltage cable gland (12) and is electrically connected to the high-voltage terminal (22) via a gasket, a spring washer and a hexagonal nut.

6. The DC lightning arrester box according to claim 1, characterized in that: The bottom surface of the mounting base (24) is placed on the upper end of the column (14), and the upper end of the column (14) is provided with a threaded hole capable of inserting a bolt (15). The mounting base (24) is fixedly connected to the column (14) via a washer, a spring washer and a bolt (15).

7. The DC lightning arrester box according to claim 1, characterized in that: The four corners of the top surface of the box body (11) are fixedly mounted with hanging ears (16), the hanging ears (16) are in an L-shaped structure, and the top surface of the hanging ears (16) is provided with a circular hole penetrating the hanging ears (16).

8. The DC lightning arrester box according to claim 7, characterized in that: The top surface of the hanging ear (16) can be in close contact with the vehicle underframe (3); the hanging ear (16) is fixedly connected to the vehicle underframe (3) via a second bolt (17); and the box body (11) is fixedly mounted on the vehicle underframe (3) via the hanging ear (16) and the second bolt (17).

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