CN218731792U - Protective device for grounding wire - Google Patents

Abstract

The utility model relates to a protection device for grounding wires, which comprises a tightening and fixing device, which includes a first fixing part with a first thread; a rear tightening device, which includes a second fixing part and an elastic joint connected to the lower end of the second fixing part. The protection part, the second fixing part has a second thread, and the elastic protection part includes a coil spring integrally formed with the second fixing part; the first thread cooperates with the second thread to tighten the fixing device and the rear tightening device Assembled helically to form a guard that is socketed and locked onto said ground conductor. The protection device of the utility model utilizes the characteristics of elastic deformation of the spring to effectively solve the problem of excessive bending and broken strands of the wire; the protection device for the grounding wire is obtained by assembling, the structure is simple and flexible, and it has wide adaptability.

Description

A protective device for grounding wire

technical field

The utility model relates to the technical field of electric power safety, in particular to a protection device for grounding wires.

Background technique

In the power system, the grounding wire is a short-circuit device to ensure the safety of the staff when the voltage unexpectedly appears on the equipment and lines that have been powered off. It uses conductors to quickly dredge the large current of the accident and avoid the possibility of the user reversely sending the inductance. It is an important electrical safety technical measure. The composition of the grounding wire mainly includes annealed copper wire, insulating rod and wire clip. An annealed copper wire is installed on the wire clip, and the copper nose is used for crimping.

At present, the joint of the ground wire on the market is made of hard copper tube, which is connected with the soft copper wire part of the wire part. When the ground wire is used frequently, it is easy to cause friction between the soft copper wire of the connecting part and the head of the hard material. If the broken strand breaks, the conductivity reliability of the grounding wire cannot be guaranteed.

The more commonly used solution at this stage is: use insulating tape to wrap the joint between the soft copper wire and the copper nose or put a rubber sleeve on the joint. The repaired insulating tape is still relatively weak after being wound, and the tape is easy to be torn off , low service life. Another solution is to use a protective cover made of a spring and a heat-shrinkable tube. The modification procedure is cumbersome, the modification price is too high, and the quality of the completed protective cover is different, so it cannot be mass-produced and has low practicability.

Utility model content

In order to solve the shortcomings in the prior art, the utility model proposes a protection device for grounding wires, which has a simple and flexible structure, effectively solves the problem of excessive bending and broken strands of the wires, and has wide adaptability.

In order to achieve the above object, the utility model adopts the following technical solutions:

A protective device for grounding conductors, comprising:

tightening the fixing device, which includes a first fixing portion with a first thread;

The rear tightening device includes a second fixing part and an elastic protection part connected to the lower end of the second fixing part, the second fixing part has a second thread, and the elastic protection part includes a coil spring integrally formed with the second fixing part;

The first thread cooperates with the second thread to spirally assemble the tightening fixing device and the rear tightening device to form a protection device that is sleeved and locked on the grounding wire.

Further, the tightening and fixing device includes a front tightening device and a connecting device with the first fixing part, the front tightening device includes a nut with a third thread, and the connecting device also includes a third fixing part , and a fixing body connecting the first fixing part and the third fixing part, and the third fixing part is provided with a fourth screw thread cooperating with the third screw thread.

Further, the outer diameter of the third fixing part increases gradually toward the fixing body, and the inner diameter of the front tightening device is greater than or equal to the minimum outer diameter of the third fixing part, but smaller than the minimum outer diameter of the third fixing part. Maximum outer diameter.

Further, the front tightening device, the connecting device and the rear tightening device are respectively integrally formed by polystyrene plastic

Further, the first fixing part is provided with several elastic pieces distributed along its circumferential direction and extending outward in the axial direction.

Further, the inner diameter of the connecting device is 1-1.8 cm, and the inner diameters of the front tightening device and the rear tightening device are both 1.8-2.2 cm.

Further, the first thread and the fourth thread have different rotation directions.

Further, the first thread and the fourth thread have different pitches.

Further, the elastic protection part further includes an elastic end part, which is interference-fitted with an end of the coil spring away from the second fixing part, and the end part has a through hole through which the ground wire passes.

Further, the length of the protective device is 5-12cm.

The beneficial effects of the utility model are:

1. The protection device of the present utility model is mainly composed of a tightening fixing device and a rear tightening device. Specifically, it can be composed of three parts: a front tightening device, a connecting device and a rear tightening device. The assembly method makes the three components The combination can be adjusted according to the actual protection object, which is simple and flexible, and has wide adaptability; and the three parts are preferably integrally formed with polystyrene plastic with good heat insulation and insulation performance, so that a protection device with excellent mechanical properties and insulation performance can be obtained.

2. This protection device adopts spiral assembly and self-tightening fixing method, which can effectively set and lock the grounding wire; by using the elastic deformation characteristics of the spring and the ending part, the sample structure after the grounding wire is set is stable, the movement is flexible, and the bending The degree test can reach more than 60 degrees, which effectively solves the problem of excessive bending and broken strands of wires.

Description of drawings

Fig. 1 is the structural front view of the protection device of the present invention;

Fig. 2 is a schematic diagram of disassembling parts of the protection device of the present invention;

Fig. 3 is a schematic structural view of the front tightening device of the present invention;

Fig. 4 is the structural representation of the utility model connecting device;

Fig. 5 is a structural schematic diagram of the rear tightening device of the present invention.

In the figure: 1. connecting device; 11. third fixing part; 12. first fixing part; 2. front tightening device; 3. rear tightening device; 31. second fixing part; 32. coil spring; 4. finishing touches.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example.

"Front" and "rear" involved in the utility model are concepts of relative positions. Taking the connection device as a reference, the direction in which the connection device is fixed with the front tightening device is "front", and the direction in which the connection device is fixed with the rear tightening device is "back".

Referring to Fig. 1-Fig. 5, a protection device for grounding wires includes a tightening and fixing device and a rear tightening device 3, the tightening and fixing device includes a first fixing part 12 with a first thread, and the rear tightening device 3 includes a first tightening device 3 Two fixed parts 31 and the elastic protection part that is connected to the second fixed part 31 lower ends, the second fixed part 31 has the second screw thread, and the elastic protection part includes the helical spring 32 integrally formed with the second fixed part 31; The two threads are matched, and the tightening fixing device and the rear tightening device 3 are spirally assembled to form a protection device that is socketed and locked on the grounding wire. Wherein, the tightening and fixing device may include a front tightening device 2 and a connecting device 1 having the first fixing part 12, the front tightening device 2 includes a nut with a third thread, and the connecting device 1 also includes a third fixing part 11 , and the fixing body that connects the first fixing part 12 and the third fixing part 11, the third fixing part 11 is provided with a fourth screw thread that cooperates with the third screw thread, and the front tightening device 2 can be screw assembled with the connecting device 1 .

The protection device of the utility model is used for the protection of the grounding wire, especially for the protection of the connection part of the grounding wire, so as to prevent the wire from being broken. Specifically, it is mainly used in two connection situations: one is that multiple annealed copper wires are connected to a single annealed copper wire through hard copper joints; the other is that annealed copper wires are crimped with copper noses to realize the connection between annealed copper wires and clamp . In the first case, the protection device is mainly used to socket and lock the connection between the soft copper wire and the hard copper joint at both ends, so as to prevent the wires from interrupting strands during use. Preferably, a plurality of wires are arranged at the end of the front tightening device 2 or in the tightening and fixing device; a single wire is sheathed in the rear tightening device 3, and the single wire has a larger space for movement and protection. In the second case, the protection device is mainly used to socket and lock the connection between the soft copper wire and the copper nose, so as to overcome the defect that the wire at the soft and hard junction is easy to break during use. Wherein, the hard segment including the copper nose is accommodated in the connection device 1, and is self-tightened and positioned by the threaded fit between the front tightening device 2 and the connection device 1 . The soft section including the annealed copper wire extends backward from the connection device 1 , and the rear tightening device 3 assembled with the connection device 1 threadedly fits and guides it.

The connecting device 1, the front tightening device 2 and the rear tightening device 3 in the utility model are preferably integrally molded by polystyrene plastic respectively, and the integral molding method can adopt methods such as injection molding and casting molding commonly used in this field.

Specifically, the connection device 1 includes a polygonal fixing body integrally formed in the middle of the outer wall of the bolt, and the third fixing part 11 and the first fixing part 12 are respectively located at the front and rear sides of the fixing body. A polygonal fixed body, preferably a hexagonal fixed body, facilitates the application of external force and standardized production. The connecting device 1 includes a plurality of elastic pieces integrally formed on the rear side of the first fixing part 12 , distributed along the circumferential direction of the bolt, and extending outward in the axial direction. The shrapnel is conducive to filling the space between the inner wall of the rear tightening device 3 and the corresponding grounding wire when the rear tightening device 3 is spirally assembled to the connecting device 1, thereby locking the grounding wire; this design is also conducive to the rear tightening device The relative rotational movement between 3 and the connection device 1 is transformed into the radial extrusion effect of the shrapnel and the grounding wire, so as to avoid damage to the grounding wire. At the same time, when the wire is bent, it can have a certain deformation space, so as to avoid the friction of the grounding wire at the end of the connecting device 1, which eventually leads to the broken strand. Preferably, several elastic pieces are evenly distributed in the circumferential direction, and more preferably, the edges of adjacent elastic pieces overlap at least partially, so as to enhance the inward pressing effect of the elastic pieces. The first thread and the fourth thread of the connection device 1 may have the same rotation direction and/or pitch, or different rotation directions and/or pitches. Preferably, the first thread and the fourth thread have different rotation directions, or have different pitches. Since the front and rear structures of the connection device 1 are different, in order to ensure that the front and rear tightening devices 3 are installed in the corresponding connection device 1, it is more advantageous to use threads with different structures for the first fixing part 12 and the third fixing part 11 respectively.

Under the condition of satisfying the matching relationship, the first thread, the second thread, the third thread and the fourth thread can all be external threads or internal threads. Wherein, when the second thread and the third thread are both external threads, the first thread and the fourth thread are internal threads. When the second thread is an external thread and the third thread is an internal thread, the first thread is an internal thread and the fourth thread is an external thread. Taking the second thread and the third thread both as external threads as an example, in order to realize the screw assembly of the front tightening device 2, the connecting device 1 and the rear tightening device 3, and the function of fixing it on the grounding wire after the assembly is completed, The structure of the front tightening device 2, the connecting device 1 and the rear tightening device 3 can be designed, for example, the outer diameter of the third fixing part 11 gradually increases toward the fixed body, and the inner diameter of the front tightening device 2 is smaller than The maximum outer diameter of the third fixing part 11 is greater than or equal to the smallest outer diameter of the third fixing part 11 . By screwing the front tightening device 2 and the rear tightening device 3 toward the fixed body of the connecting device 1, after the assembly of the front tightening device 2, the connecting device 1 and the rear tightening device 3 is completed, the protective device formed by them can be fixed on the ground conductor.

The rear tightening device 3 also includes a hollow polygonal fixing head integrally formed on the upper end of the second fixing part 31 . Similar to the fixed body of the connecting device 1, the nut of the front tightening device 2 and the fixing head of the rear tightening device 3 are preferably hexagonal in shape, which is convenient for applying external force and standardized production. The elastic protection part of the rear tightening device 3 includes a coil spring 32 integrally formed with the second fixing part 31 . The inner diameter of the coil spring 32 is preferably 1.8-2.2 cm. The helical spring 32 has an inner diameter slightly larger than the outer diameter of the inner sleeve wire, which is not only convenient for inserting the wire, but also helps to provide flexible protection with the swing of the wire during use, effectively avoiding the broken strand of the wire. The elastic protection part can also include an elastic ending part 4, which is interference-fitted with the end of the coil spring 32 away from the second fixing part 31. The ending part 4 has a through hole through which the grounding wire is inserted, so that the free end of the coil spring 32 can be terminated. , forming a smooth end, and flexible positioning of the wires in it, preventing the wires from swaying and stretching.

For the size design of the protective device, preferably, the connecting device 1 has an inner diameter of 1-1.8 cm, the front tightening device 2 and the rear tightening device 3 have an inner diameter of 1.8-2.2 cm, and the length of the protective device is 5-12 cm, preferably 8-12 cm . Select an appropriate inner diameter to provide enough accommodation space for the grounding wire, and adjust the wall thickness according to the application scenario, so that the overall outer diameter of the protective device is controlled within 2.5cm, preferably within 2cm. The length of the protective device can also be selected according to the size of the actual grounding wire and the usage scenario. If the length is too short, the bending angle of the coil spring 32 is limited, which is difficult to meet the needs; if the length is too long, it will take up space, increase the difficulty of forming and increase the cost. Choose a reasonable inner diameter, outer diameter and overall length, so that the bending test of the sample after the grounding wire is installed can reach more than 60 degrees, which does not affect the flexibility of the wire, and effectively solves the problem of excessive bending of the wire, thereby providing long-term, reliable protection.

The working principle of this embodiment:

1) When multiple soft copper wires are connected to a single soft copper wire through a hard copper joint:

First of all, pass a single soft copper wire through the elastic tailing part 4, pass through the rear tightening device 3 and the connecting device 1 through the end of the coil spring 32, arrange multiple soft copper wires through the front tightening device 2, and use the hard copper joint Crimp the annealed copper wires at both ends. Then, adjust the joint part to the inside of the connection device 1, then tighten the third thread of the front tightening device 2 to the fourth thread of the connection device 1, and realize the front end of the protection device through the interference fit between the fourth thread and the third thread. Self-tightening and fixing; tighten the second thread of the rear tightening device 3 with the first thread of the connecting device 1, and the annealed copper wire is further locked under the supplementary extrusion of the shrapnel; finally insert the elastic tail 4 into the Inside the end of the coil spring 32.

2) When the soft copper wire and the copper nose are crimped to realize the connection between the soft copper wire and the clamp:

First, pass the soft copper wire through the elastic tailing part 4, pass the rear tightening device 3 and the connecting device 1 through the end of the coil spring 32, pass the copper nose connected to the wire clamp through the front tightening device 2, and use the copper nose to tighten the soft copper wire. Copper wires are crimped. Then, adjust the joint part to the inside of the connection device 1, and then tighten the third thread of the front tightening device 2 to the fourth thread of the connection device 1, and realize the front end of the protection device through the interference fit between the third thread and the fourth thread. Self-tightening and fixing; tighten the second thread of the rear tightening device 3 with the first thread of the connecting device 1, and the annealed copper wire is further locked under the supplementary extrusion of the shrapnel; finally insert the elastic tail 4 into the Inside the end of the coil spring 32.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (10)

1. A ground conductor protection device, comprising:

a tightening fixture comprising a first fixing portion (12) having a first thread;

a rear tightening device (3) including a second fixing portion (31) and an elastic protection portion connected to a lower end of the second fixing portion (31), the second fixing portion (31) having a second thread, the elastic protection portion including a coil spring (32) integrally formed with the second fixing portion (31);

the first threads are matched with the second threads, and the tightening fixing device and the rear tightening device (3) are assembled in a spiral mode to form a protection device which is sleeved and locked on the grounding lead.

2. The protection device according to claim 1, characterized in that said tightening and fixing means comprise a front tightening device (2) and a connecting device (1) having said first fixing portion (12), said front tightening device (2) comprising a nut having a third thread, said connecting device (1) further comprising a third fixing portion (11) and a fixing body connecting said first fixing portion (12) and said third fixing portion (11), said third fixing portion (11) being provided with a fourth thread cooperating with said third thread.

3. Protection device according to claim 2, characterized in that the outer diameter of said third anchoring portion (11) increases progressively in the direction towards the anchoring body, the inner diameter of said front tightening device (2) being greater than or equal to the minimum outer diameter of said third anchoring portion (11) but less than the maximum outer diameter of said third anchoring portion (11).

4. Protection device according to claim 2, characterized in that the front tightening device (2), the connecting device (1) and the rear tightening device (3) are each integrally formed from polystyrene plastic.

5. A protection device according to any one of claims 1-4, characterized in that the first fixing portion (12) is provided with a number of resilient tabs distributed in the circumferential direction thereof and extending axially outwards.

6. A protection device according to any one of claims 2-4, characterized in that the inner diameter of the connecting device (1) is 1-1.8cm and the inner diameters of the front tightening device (2) and the rear tightening device (3) are each 1.8-2.2cm.

7. A protective device according to any one of claims 2-4, wherein the first thread and the fourth thread have different directions of rotation.

8. A protective device according to any one of claims 2-4, wherein the first and fourth threads have different pitches.

9. The protection device according to claim 1, wherein the elastic protection portion further comprises an elastic tail portion (4) which is in interference fit with one end of the coil spring (32) far away from the second fixing portion (31), and the tail portion (4) is provided with a through hole for the ground wire to pass through.

10. A protective device according to claim 1, wherein the protective device has a length of 5-12cm.

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