CN202503117U - grounding body - Google Patents

Abstract

The utility model discloses a grounding body which comprises a grounding main body and a wire connecting terminal. The grounding main body comprises an upper main body, a middle main body, a lower main body, a center circular rod, and a plurality of circular pipes. The center circular rod is vertically inserted into a main body axial inner hole. The central section of the center circular rod is provided with a liquid feeding blind hole. A plurality of liquid outlet holes are provided uniformly on a lower end conical surface of the center circular rod. The liquid feeding blind hole is respectively communicated with the plurality of liquid outlet holes. The plurality of circular pipes are respectively inserted into radial positioning holes. One end of each of the circular pipes is inserted into the middle main body inner hole. A wedge-form surface of one end tip of each of the circular pipes abuts against the lower end conical surface of the center circular rod. After the grounding main body is pre-buried, each circular pipe is respectively inserted into the soil surrounding the grounding main body, and the liquid outlet holes at the lower end of the center circular rod are respectively communicated with the circular pipe inner holes in corresponding positions. The grounding body has high strength, a small grounding resistance, and good corrosion resistance and conductive effect, a sodium chloride resistance reduction liquid can be regularly added, the use cost is low, and the soil excavation amount is small.

Description

grounding body

technical field

The utility model relates to a grounding device for a low-voltage power distribution network, in particular to a grounding device that can be widely used in low-voltage AC neutral grounding points, protection grounding, repeated grounding of zero-connection, and grounding of equipment shells in systems where the neutral point is not grounded, and belongs to electric power safety equipment technology field.

Background technique

The grounding body is a grounding device buried in the soil, which can effectively guide power fault current, lightning current, static electricity, etc. into the earth, reduce the step voltage, and ensure the normal operation of equipment and personal safety. The grounding body is generally made of steel wire. Since the steel wire itself has a large resistance and a small surface area per unit length, the part buried in the ground must have a sufficient length to reduce its resistance value and enhance conductivity, resulting in the need for a large amount of soil excavation. , increasing the difficulty of construction. At present, the grounding bodies used in the lightning protection devices of transformers and large buildings in the power industry mostly adopt the method of welding angle steel with flat iron. , transformers and building protection facilities lose their protection functions. the

The Chinese Utility Model Patent No. 201020130370.4 discloses a grounding electrode, which is composed of a grounding electrode body and a grounding terminal. The grounding electrode body is composed of upper, middle and lower sections, which can be reduced by adjusting the length Small grounding resistance, but this will increase the amount of soil excavation and cause certain difficulties to the construction.

The Chinese Utility Model Patent No. 201020625497.3 discloses a grounding electrode. The grounding electrode is provided with a graphite electrode under the flat iron. The underground part of the flat iron is provided with a graphite electrode and a contact point close to the graphite electrode, which improves the anti-corrosion function and conductive effect. It improves the protection function for people, transformers and building protection facilities, but the graphite electrode has low strength and is easily damaged when it is driven into the ground. In addition, the lower end of the flat iron and the square groove of the graphite electrode in this patent are connected by conductive glue. The bonding interface with the metallized layer is prone to oxidation and corrosion, which poses a safety hazard.

Contents of the invention

The purpose of the utility model is to provide a grounding body with simple structure, high strength, corrosion resistance, small amount of soil excavation and effective reduction of grounding resistance.

The utility model is realized through the following technical solutions:

A grounding body, comprising a grounding body and a terminal fixed on the upper end of the grounding body, the grounding body includes an upper body, a middle body, a lower body, a central round rod and a plurality of round tubes, the upper body, the middle body and the lower body The main body is fixedly connected in turn, the lower end of the lower main body is conical, the central rod is inserted into the axial inner hole of the main body, the central rod is provided with a blind hole for adding liquid in the axial center, the lower end of the central rod is conical, and the lower end of the central rod is conical There are evenly provided a plurality of liquid outlet holes connected with the liquid filling blind holes on the surface, and a plurality of radial positioning holes corresponding to the positions of the liquid outlet holes are evenly arranged on the outer peripheral surface of the intermediate body. To the positioning hole, one end of the round tube extends into the axial inner hole of the main body, and the wedge-shaped surface of one end of the round tube abuts against the conical surface of the lower end of the central round rod; after the grounding body is pre-buried, the other end of the round tube respectively extends into In the soil around the grounding body, a plurality of liquid outlet holes at the lower end of the central round rod communicate with the inner holes of the corresponding circular tubes respectively.

The purpose of this utility model can also be further realized by the following technical measures.

The aforementioned grounding body, wherein the top of the blind hole for adding liquid in the central round rod is provided with a blind hole end cover, and the other end of the round tube is provided with a round tube end cover, and the round tube end cover is provided with a plurality of axial penetration holes. hole. The circular tube is provided with several radial through holes at intervals in the axial direction.

In the aforementioned grounding body, the upper body, the middle body and the lower body are all made of hot-dip galvanized steel. the

The utility model can regularly add sodium chloride resistance reducing liquid, has simple structure, low cost, good repeatability, small amount of soil excavation, the grounding body is made of hot-dip galvanized steel, and has good corrosion resistance. Compared with the prior art, the utility model adopts the circular tube structure with the grounding body uniformly distributed in the circumferential direction and one end of which is a wedge-shaped surface, and sodium chloride drag-reducing liquid is filled in the inner holes of each circular tube. Under the extrusion of the wedge-shaped surface at one end of the round tube, the conical surface at the lower end of the round rod, the other ends of the round tubes protrude outward into the soil around the grounding body respectively, increasing the contact surface between the grounding body and the surrounding soil. At this time, the center circle The liquid outlet holes at the lower end of the rod are respectively communicated with the axial solution channels of the circular tubes at the corresponding positions. The sodium chloride resistance reducing liquid is input into the liquid filling blind hole of the central round rod, and the sodium chloride resistance reducing liquid flows into the axial solution channel of each round tube along the liquid filling blind hole and the liquid outlet hole, and finally passes through the end of the round tube The multiple penetration holes and radial through holes of the cover penetrate into the surrounding soil, reducing the resistivity of the soil around the grounding body, so the grounding resistance of the utility model is very small, and the dredging performance of the current is greatly improved. Can withstand the impact of large lightning current or short-circuit current.

The advantages and characteristics of the invention are illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is an enlarged view of part I of Fig. 1;

Fig. 3 is a schematic diagram of the structure of the utility model after embedding.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 to 3, the utility model includes a grounding body 1, a connection terminal 2 arranged on the upper end of the grounding body 1 and perpendicular to the grounding body 1, one end of the connection terminal 2 is welded or screwed to the grounding body 1, and the grounding body 1 has a diameter ranging from 40mm to 60mm and a height ranging from 800mm to 1000mm. The grounding body 1 includes an upper body 11, a middle body 12, a lower body 13, a central round rod 14 and a plurality of round pipes 15, an upper body 11, and a middle body 12. It is fixedly connected with the lower body 13 in sequence, and the three are all made of hot-dip galvanized steel, which improves the corrosion resistance of the grounding body 1. The lower end of the lower body 13 is conical, which is convenient for insertion into the soil. The central round rod 14 is inserted into the axial inner hole 111 of the main body. The central round rod 14 is provided with a liquid filling blind hole 141 in the axial center. Liquid hole 142, a plurality of radial positioning holes 121 corresponding to the positions of the liquid outlet holes 142 are evenly provided on the outer peripheral surface of the middle body 12, and a plurality of circular tubes 15 are respectively inserted into each radial positioning hole 121, and one end of the circular tube 15 extends into the main body In the axial inner hole 111 , the wedge-shaped surface at one end of the round pipe 15 abuts against the conical surface at the lower end of the central round rod 14 . After the grounding body is pre-buried, the other ends of the round pipe 15 extend into the soil around the grounding body respectively, and the plurality of liquid outlet holes 142 at the lower end of the central round rod 14 communicate with the corresponding inner holes 151 of the round pipe. The top of the liquid filling blind hole 141 of the central round rod 14 is provided with a blind hole end cap 3, and the other end of the round pipe 15 is provided with a round pipe end cap 4, and the round pipe end cap 4 is provided with a plurality of axial penetration holes 41. It is convenient for the sodium chloride drag-reducing liquid to penetrate into the soil. The circular pipe 15 is provided with three radial through holes 152 at axial intervals, so that the sodium chloride drag-reducing liquid can penetrate more fully.

When in use, first insert the circular tubes 15 into the radial positioning holes 121 on the outer circle of the intermediate body 12, then screw the upper body 11, the intermediate body 12, and the lower body 13 into one body in turn, and then connect the central round rod 14. Insert vertically into the axial inner hole 111 of the main body to make the two stick together. At the place where the grounding body needs to be installed, dig out a soil pit with a diameter of 500mm and a depth of 1500mm. Put the utility model vertically into the pit, and use soil Tamp and fill to about 10 mm from the lower end of the terminal 2, and then lay down the central rod 14. Under the extrusion of the wedge-shaped surface of the conical surface of the circular tube 15 at the lower end of the central circular rod 14, each circular tube 15 separates from the middle body 12 Squeeze outward into the soil around the grounding body 1. At this time, the liquid outlet holes 142 at the lower end of the central round rod 14 communicate with the inner holes 151 of the corresponding circular tubes respectively, as shown in FIG. Sodium chloride drag reducing solution is added to the hole 141. The sodium chloride drag reducing solution in this embodiment is a sodium chloride solution with a concentration of 5 mol/liter. The sodium chloride drag reducing solution is added along the blind hole 141 of the central round rod 14. , The liquid outlet holes 142 flow into the axial inner hole 111 of the main body respectively, then pass through the radial through hole 152 and the inner hole 151 of the circular tube, and penetrate into the surrounding soil through the multiple permeation holes 41 on the outer end cover 4, and use the upper end cover 3. Close the liquid-filling blind hole 141 of the central round bar 14, connect the grounding wire to the terminal 2, and finally fill up the utility model with soil and ram it.

The utility model can be applied to the grounding of the low-voltage power distribution network, and can also be widely used in the grounding of the neutral point of the low-voltage AC neutral point grounding system, the repeated grounding of the protection connection zero, and the grounding of the equipment shell in the neutral point ungrounded system. It is also suitable for ground protection devices used in broadcasting, communications, electric power, railways, civil aviation, mountains, deserts, oil and gas transmission, and chemical industries.

In addition to the above-mentioned embodiments, the utility model can also have other implementation modes, and all technical solutions formed by equivalent replacement or equivalent transformation all fall within the scope of protection required by the utility model.

Claims (4)

1. A grounding body, characterized in that: comprising a grounding body, a terminal fixed on the upper end of the grounding body, the grounding body includes an upper body, a middle body, a lower body, a central round bar and a plurality of circular tubes, the upper body The main body, the middle main body and the lower main body are fixedly connected in turn. The lower end of the lower main body is conical. The central rod is inserted into the axial inner hole of the upper main body. The conical surface at the lower end of the central round rod is uniformly provided with a plurality of liquid outlet holes connected with the liquid filling blind hole, and the outer peripheral surface of the middle body is evenly provided with a plurality of radial positioning holes corresponding to the positions of the liquid outlet holes. A circular tube is respectively inserted into each radial positioning hole, one end of the circular tube extends into the axial inner hole of the main body, and the wedge-shaped surface of one end of the circular tube abuts against the conical surface of the lower end of the central rod; after the grounding body is pre-buried, the circular tube The other ends protrude into the soil around the grounding body respectively, and the plurality of liquid outlet holes at the lower end of the central round bar communicate with the inner holes of the round tubes at corresponding positions respectively. 2. The grounding body according to claim 1, characterized in that: the top of the blind hole for adding liquid in the central round rod is provided with a blind hole end cap, and the other end of the round pipe is provided with a round pipe end cap, and the round pipe The end cover is provided with a plurality of axial penetration holes. 3. The grounding body according to claim 2, characterized in that: the circular tube is provided with several radial through holes at intervals in the axial direction. 4. The grounding body according to claim 1, 2 or 3, wherein the upper body, the middle body and the lower body are all made of hot-dip galvanized steel.

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