Grounding jumper wire of electrified railway contact network

Abstract

The invention discloses an electrified railway overhead line system grounding jumper wire, and relates to the technical field of the electrified railway overhead line system grounding jumper wire. The grounding jumper wire is of an integral structure and comprises a first holding section, a first jumper wire section, a middle telescopic section, a second jumper wire section and a second holding section; the first jumper segment and one end of the first holding segment are integrally formed, the middle telescopic segment is connected between the first jumper segment and the first holding segment in series and is an annular spiral body formed by coiling the first jumper segment and the middle telescopic segment, the second jumper segment and one end of the second holding segment are integrally formed, and the first jumper segment, the second jumper segment and the middle telescopic segment are formed by spirally twisting multiple strands of metal wires. The first holding section is provided with two symmetrical pre-formed spiral first clamping arms which are formed by splitting metal wires of a first jumper section and are used for winding a first wire; the second holding section is provided with two symmetrical second clamping arms which are the same as the first clamping arms in structure and used for winding a second wire. The structure can prevent the jumper from swinging and bending, enhances the connection stability, adapts to lead displacement, and meets the outdoor complex use requirements of electrified railways.

Description

Technical Field

[0001] This invention relates to the field of electrified railway catenary technology, and more particularly to a grounding jumper for electrified railway catenary. Background Technology

[0002] In electrified railway catenary systems, insulators may experience insulation failures due to external environmental influences, such as lightning strikes, flashovers, and creepage. The catenary current can then leak through the cantilever insulator to the pole, and this leaked current can be conducted to the ground through the pole, potentially causing catenary faults or electric shock accidents. By installing a leakage conductor in the middle of the shed at the end of the cantilever insulator and connecting it to the return conductor via a grounding jumper, the leaked current can be conducted to the return conductor. The return conductor then safely conducts the leaked current to the catenary grounding system, ensuring the safe operation of the catenary and preventing electric shock accidents.

[0003] At present, multiple soft aluminum wires are generally used as grounding jumpers, and multiple parallel groove clamps are used to connect the grounding jumpers to the discharge conductor and return conductor of the cantilever insulator. The parallel groove clamps are tightened by fastening bolts. This type of grounding jumper has a complex structure, many parts, and is difficult to install.

[0004] In addition, due to the influence of external environmental factors such as wind, rain, and snow, the conductors and grounding jumpers will vibrate and swing, which will cause the fastening bolts to loosen. This is difficult to detect in daily maintenance and inspection. The existing soft aluminum wire has low strength, and repeated bending of the soft aluminum wire will occur at the connection with the discharge conductor and the connection with the return conductor, resulting in broken strands and wires of the soft aluminum wire. In particular, the breakage of grounding jumpers is more serious in windy conditions. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a grounding jumper for the overhead contact system of electrified railways.

[0006] To achieve the above objectives, the present invention provides a grounding jumper for the overhead contact system of electrified railways. It is an integral structure, including a first grip section, a first jumper section, an intermediate telescopic section, a second jumper section, and a second grip section; The first jumper segment is integrally formed and connected to one end of the first gripping segment. The intermediate telescopic segment is connected in series between the first jumper segment and the second jumper segment. The second jumper segment is integrally formed and connected to one end of the second gripping segment. The intermediate telescopic segment is a ring-shaped spiral structure formed by coiling the first jumper segment and the second jumper segment themselves. The first gripping section includes two symmetrically arranged first clamping arms. The first jumper section, the second jumper section and the intermediate telescopic section are formed by spirally twisting multiple metal wires together. The two first clamping arms are formed by bundling the multiple metal wires of the first jumper section and are pre-formed spiral structures. The first clamping arms are used to pre-twist and wind the first conductor. The second gripping section includes two symmetrically arranged second clamping arms. The two second clamping arms are formed by multiple strands of metal wires from the second jumper section. The second clamping arms have the same structure as the first clamping arms. The second clamping arms are used for pre-twisting and winding the second conductor.

[0007] Preferably, each of the first clamping arms and each of the second clamping arms is a pre-twisted bundle consisting of at least three spiral metal wires bonded side by side.

[0008] Preferably, the two first clamping arms and the two second clamping arms extend in opposite directions.

[0009] Preferably, the inner diameter of the helix of the first clamping arm is smaller than the outer diameter of the first wire, and the inner diameter of the helix of the second clamping arm is smaller than the outer diameter of the second wire.

[0010] Preferably, a central reinforcing wire is provided at the center of the multiple intertwined metal wires in the first jumper segment, and the remaining metal wires are twisted around the central reinforcing wire.

[0011] Preferably, the inner surface of the pre-twisted bundle is coated with a conductive sand layer.

[0012] Preferably, the cross-sections of the first jumper segment, the second jumper segment, and the intermediate telescopic segment are circular.

[0013] Preferably, the annular spiral structure of the intermediate telescopic section is formed by the first jumper segment and the second jumper segment coiling together at least one turn.

[0014] Preferably, the lengths of the spiral-shaped first and second clamping arms are greater than or equal to 2.5 screw pitches.

[0015] Preferably, the metal wire is made of aluminum alloy.

[0016] Based on this, the beneficial effects of the present invention are as follows: The grounding jumper of this invention has two symmetrical, oppositely oriented clamping arms in its first and second gripping sections. When connected to the first and second conductors respectively, these arms form a T-shaped connection, preventing unilateral swaying and relative bending of the grounding jumper. Simultaneously, each clamping arm has at least three spiral metal wires bonded side-by-side to form a pre-twisted bundle, with the inner diameter of the spiral smaller than the outer diameter of the conductor to be clamped, generating a stable clamping force for stable holding. Furthermore, the intermediate telescopic section provides the grounding jumper with ample room for expansion and contraction, preventing structural swaying and additional tensile force. The entire grounding jumper is made of high-strength aluminum alloy wire, enhancing its strength, reducing strand breakage, and achieving a flexible mechanical and electrical connection between the drain conductor and return conductor. This solves the problems of low strength, easy strand breakage, easily loosened and difficult-to-detect bolts in existing grounding jumpers, complex structure, and difficult installation and maintenance. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This schematic diagram illustrates the structure of a grounding jumper according to one embodiment of the present invention. Figure 2 This schematic diagram illustrates the structure of the first gripping segment according to one embodiment of the present invention. Figure 3 A schematic diagram illustrating the installation of a grounding jumper according to one embodiment of the present invention; Figure 4 A schematic cross-sectional view of the first jumper segment according to a first embodiment of the present invention; Figure 5 A schematic cross-sectional view of the first jumper segment according to a second embodiment of the present invention; Figure 6 A schematic diagram illustrating the installation of a grounding jumper and a pin insulator according to one embodiment of the present invention; Explanation of reference numerals in the attached diagram: 10-Grounding jumper, 101-First gripping section, 1011-First clamping arm, 102-First jumper section, 103-Intermediate telescopic section, 104-Second jumper section, 105-Second gripping section, 1051-Second clamping arm; 20 - First conductor, 30 - Second conductor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a," "the," and "the" as used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be understood that although the terms first, second, third, etc., may be used to describe related structures in the embodiments of this application, these related structures should not be limited to these terms. These terms are only used to distinguish related structures from each other.

[0021] Depending on the context, the word "if" as used here can be interpreted as "when" or "when". Similarly, depending on the context, the phrase "if determined" can be interpreted as "when determined" or "when (the condition or event of the statement) is detected".

[0022] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.

[0023] Figure 1 This schematic diagram illustrates the structure of a grounding jumper according to one embodiment of the present invention. Figure 2 This schematic diagram illustrates the structure of the first gripping segment according to one embodiment of the present invention. Figure 3 This schematic diagram illustrates the installation of a grounding jumper according to one embodiment of the present invention, as shown below. Figure 1-3 As shown, a grounding jumper for an electrified railway contact network according to the present invention includes: The grounding jumper 10 is an integral structure, including a first holding section 101, a first jumper section 102, an intermediate telescopic section 103, a second jumper section 104, and a second holding section 105; The first jumper segment 102 is integrally formed and connected to one end of the first gripping segment 101. The intermediate telescopic segment 103 is connected in series between the first jumper segment 102 and the second jumper segment 104. The second jumper segment 104 is integrally formed and connected to one end of the second gripping segment 105. The intermediate telescopic segment 103 is a ring-shaped spiral structure formed by coiling the first jumper segment 102 and the second jumper segment 104 themselves. The first gripping section 101 includes two symmetrically arranged first clamping arms 1011. The first jumper section 102, the second jumper section 104 and the intermediate telescopic section 103 are formed by spirally twisting multiple strands of metal wire together. The two first clamping arms 1011 are formed by bundling the multiple strands of metal wire from the first jumper section 102 and are pre-formed spiral structures. The first clamping arms 1011 are used to pre-twist and wind the first conductor 20. The second gripping section 105 includes two symmetrically arranged second clamping arms 1051. The two second clamping arms 1051 are formed by multiple strands of metal wires from the second jumper section 104. The second clamping arms 1051 have the same structure as the first clamping arm 1011. The second clamping arms 1051 are used for pre-twisting the second conductor 30.

[0024] Specifically, each first clamping arm 1011 is composed of at least three spiral metal wires bonded side by side to form a pre-twisted bundle. The length of each spiral first clamping arm 1011 is greater than or equal to 2.5 times the pitch of the wire, and the inner diameter of the spiral of each spiral first clamping arm 1011 is smaller than the outer diameter of the first wire 20 to be wound. When the pre-twisted first clamping arm 1011 is wound around the first wire 20, the first clamping arm 1011 will expand and tightly clamp the first wire 20 through the elasticity of the pre-twisted spiral metal wire. In this way, a stable gripping force is achieved on the first wire 20 through a stable clamping force, thus avoiding the problem of wire breakage.

[0025] Similarly, each second clamping arm 1051 is also composed of at least three spiral metal wires bonded side by side to form a pre-twisted bundle. The second clamping arm 1051 has the same length as the first clamping arm 1011, and the inner diameter of the spiral of the second clamping arm 1051 is also smaller than the outer diameter of the second wire 30 to be wound. When the pre-twisted second clamping arm 1051 is wound around the second wire 30, the second clamping arm 1051 will also be expanded by it, thereby providing a stable clamping force through the elasticity of the metal wire, and realizing a stable gripping force on the second wire 30.

[0026] Meanwhile, the two first clamping arms 1011 and the two second clamping arms 1051 extend in opposite directions, so that the first clamping arms 1011 can wrap around and extend to both sides of the first conductor 20 to form a T-shaped connection structure. Similarly, the second clamping arms 1051 can wrap around and extend to both sides of the second conductor 30 to form a T-shaped connection structure. By setting the T-shaped structure at both ends of the grounding jumper 10, the swaying of the grounding jumper 10 on one side can be effectively avoided, so that it is not prone to relative bending, avoiding the problem of wire breakage, and the structure is more stable.

[0027] Furthermore, the annular spiral structure of the intermediate telescopic section 103 is formed by the first jumper segment 102 and the second jumper segment 104 coiling together at least once. The circular intermediate telescopic section 103 can deform and extend, ensuring that the entire grounding jumper 10 has the margin for free expansion and contraction, and preventing additional tensile stress on the grounding jumper 10 due to structural swaying.

[0028] Furthermore, conductive sand layers are attached to the inner surfaces of the spiral pre-twisted bundles of the first clamping arm 1011 and the second clamping arm 1051. These conductive sand layers can effectively fill the tiny gaps between the pre-twisted bundles and the wound wires, eliminate the influence of the oxide layer on the contact surface, and thus reduce the contact resistance between the two. This not only improves the electrical conduction performance but also enhances the gripping friction between the pre-twisted bundles and the wires, further ensuring the stable gripping effect of the first and second clamping arms on the corresponding wires and avoiding the risk of conductive failure or mechanical detachment due to loose contact.

[0029] Furthermore, Figure 4 This schematic diagram shows a cross-sectional view of the first jumper segment according to a first embodiment of the present invention. Figure 5 A schematic cross-sectional view of the first jumper segment of the second embodiment of the present invention is shown, as follows: Figure 4 , 5 As shown: In the first embodiment of the present invention, the cross-sections of the first jumper segment 102, the intermediate telescopic segment 103 and the second jumper segment 104 are circular, which can make the current evenly distributed to reduce losses, improve the bending and vibration resistance, and facilitate stranding production and telescopic segment winding, thus adapting to construction and outdoor use needs.

[0030] Meanwhile, in the second embodiment of the present invention, a central reinforcing wire is provided at the center of the multiple intertwined metal wires of the first jumper segment 102, the intermediate telescopic segment 103 and the second jumper segment 104, and the remaining metal wires are twisted around the central reinforcing wire. This structure can significantly improve the overall tensile strength, bending resistance and structural stability of the jumper segment and the telescopic segment, effectively reduce the risk of strand breakage and wire breakage caused by wind vibration and conductor swing, further adapt to the complex outdoor working conditions of electrified railway contact network, and extend the service life of the grounding jumper 10.

[0031] Furthermore, Figure 6 This schematic diagram illustrates the installation of a grounding jumper and a pin insulator according to one embodiment of the present invention, as shown below. Figure 6 As shown: When installing the grounding jumper 10 of the present invention, a pin insulator can be installed on the support structure to assist in fixing the grounding jumper 10. The grounding jumper 10 is wound onto the pin insulator by pre-twisted binding wire, thereby achieving a fixed connection between the two and further enhancing the stability of the grounding jumper 10.

[0032] Furthermore, the metal wire is made of high-strength aluminum alloy, which has high strength and good bending resistance, and can significantly reduce the breakage rate of the grounding jumper 10.

[0033] In summary, in the grounding jumper 10 structure of the present invention, the first gripping section 101 and the second gripping section 105 are each provided with two symmetrical reverse clamping arms, so that when the two ends of the grounding jumper 10 are connected to the first conductor 20 and the second conductor 30 respectively, a T-shaped structure is formed, which can effectively avoid unilateral swinging and relative bending. Each clamping arm is made of at least three spiral metal wires bonded side by side to form a pre-twisted bundle, the inner diameter of which is smaller than the outer diameter of the conductor to be wound. After winding, the bundle is expanded by the conductor, and the conductor is tightly clamped by the elasticity of the metal wire, ensuring stable gripping force, thereby improving the connection reliability between the grounding jumper 10 and the conductor. The grounding jumper 10 of the present invention can solve the problems of weak vibration resistance and tensile strength of the original jumper, easy loosening of the connection with the conductor, and short service life.

[0034] The above description is merely a preferred embodiment of this application. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A grounding jumper for an electrified railway contact network, characterized in that, The grounding jumper is an integral structure, including a first holding section, a first jumper section, an intermediate telescopic section, a second jumper section, and a second holding section; The first jumper segment is integrally formed and connected to one end of the first gripping segment. The intermediate telescopic segment is connected in series between the first jumper segment and the second jumper segment. The second jumper segment is integrally formed and connected to one end of the second gripping segment. The intermediate telescopic segment is a ring-shaped spiral structure formed by coiling the first jumper segment and the second jumper segment themselves. The first gripping section includes two symmetrically arranged first clamping arms. The first jumper section, the second jumper section and the intermediate telescopic section are formed by spirally twisting multiple metal wires together. The two first clamping arms are formed by bundling the multiple metal wires of the first jumper section and are pre-formed spiral structures. The first clamping arms are used to pre-twist and wind the first conductor. The second gripping section includes two symmetrically arranged second clamping arms. The two second clamping arms are formed by multiple strands of metal wires from the second jumper section. The second clamping arms have the same structure as the first clamping arms. The second clamping arms are used for pre-twisting and winding the second conductor.

2. The grounding jumper for an electrified railway contact network according to claim 1, characterized in that, Each of the first clamping arms and each of the second clamping arms is a pre-twisted bundle consisting of at least three spiral metal wires bonded side by side.

3. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The two first clamping arms and the two second clamping arms are arranged to extend in opposite directions.

4. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The inner diameter of the first clamping arm is smaller than the outer diameter of the first wire, and the inner diameter of the second clamping arm is smaller than the outer diameter of the second wire.

5. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, A central reinforcing wire is placed at the center of the multiple intertwined metal wires in the first jumper segment, and the remaining metal wires are twisted around the central reinforcing wire.

6. A grounding jumper for an electrified railway contact network according to claim 2, characterized in that, The inner surface of the pre-twisted bundle is coated with a layer of conductive sand.

7. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The cross-sections of the first jumper segment, the second jumper segment, and the intermediate telescopic segment are circular.

8. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The annular spiral structure of the intermediate telescopic section is formed by the first jumper segment and the second jumper segment coiling together at least one turn.

9. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The lengths of the spiral-shaped first and second clamping arms are greater than or equal to 2.5 screw pitches.

10. A grounding jumper for an electrified railway contact network according to claim 1, characterized in that, The metal wire is made of aluminum alloy.

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