A composite cross-arm fitting, a cross-arm assembly and a transmission tower

Abstract

The present invention discloses a composite cross-arm fitting, a cross-arm assembly and a transmission tower. The fitting includes a first connecting member, a second connecting member and a plurality of wire clamps. The first connecting member is fixedly connected to the second connecting member. The second connecting member is U-shaped, and the wire clamps are fixedly connected to the second connecting member. The wire clamps are suspension wire clamps or strain wire clamps. By the above method, it is possible to solve the problems in the prior art that the electric field at the wire hanging node is uneven and prone to abnormal discharge, and the connection of the transmission line conductors in small corners is relatively complex and there is a risk of wind-induced jumper, especially the problem that the arrangement of the conductor breaking and jumper connection structure in the strain line is cumbersome.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and particularly relates to a composite cross-arm fitting, a cross-arm assembly and a transmission tower. Background Art

[0002] In the prior art, the conductor connection fitting is generally cylindrical. The fitting with such a structure is usually heavy, with a large weight and volume, resulting in a high manufacturing cost and inconvenient installation. In addition, the cylindrical fitting structure has no electric field shielding function, and it is easy to form an electric field singularity to generate abnormal discharge. Moreover, limited by the shape of the cylinder, the number of clamps that can be connected to the cylindrical connection fitting is small. Usually, each conductor has only one clamp for fixing, and it usually cannot bear force and cannot be used on the angle tower, so the application range is limited. Summary of the Invention

[0003] The present invention provides a composite cross-arm fitting, a cross-arm assembly and a transmission tower to solve the problems in the prior art that the electric field distribution of the conductor connection fitting of the transmission line is uneven, and the wire breaking and jumper connection structure arrangement are cumbersome when the angle of the small-angle corner is required.

[0004] To solve the above technical problems, a technical solution adopted by the present invention is to provide a composite cross-arm fitting. The fitting includes a first connecting member, a second connecting member and a plurality of clamps. The first connecting member is fixedly connected to the second connecting member. The second connecting member includes at least one U-shaped structure. The clamps are fixedly connected to the second connecting member, and the clamps are suspension clamps or strain clamps.

[0005] Further, the fitting further includes a third connecting member, and the third connecting member is fixedly connected to the first connecting member and / or the second connecting member.

[0006] Further, the first connecting member is a flange cylinder. The number of the first connecting members is one, two or more. The first connecting members are connected and fixed to the closed end of the U-shaped structure by means of flange connection or welding.

[0007] Further, the second connecting member is horizontally arranged, and the clamps are fixedly connected to the two horizontal sides of the second connecting member.

[0008] Further, the open end of the U-shaped structure is connected and closed by a cover.

[0009] Further, the second connecting member includes at least two U-shaped structures and a plurality of fourth connecting members. At least two U-shaped structures are arranged in parallel in the same direction and are connected to each other by the fourth connecting members.

[0010] Further, the clamps are connected to the fourth connecting members and / or the U-shaped structures.

[0011] To solve the above problems, the present application further provides a crossarm assembly, which includes at least two post insulators and the composite crossarm fitting described in any one of the above, and the at least two post insulators are fixedly connected through the composite crossarm fitting described in any one of the above.

[0012] Further, the crossarm assembly further includes two stay insulators, and the two post insulators and the two stay insulators are fixedly connected through the composite crossarm fitting.

[0013] To solve the above problems, the present application further provides a transmission tower, which includes a tower body and the crossarm assembly described in any one of the above.

[0014] Different from the prior art, a composite crossarm fitting, a crossarm assembly and a transmission tower provided by the present invention can effectively reduce the distance between the conductor and the composite crossarm by designing a new type of composite crossarm connecting fitting and integrating the conductor clamp with the composite crossarm connecting member, and effectively solve the problem of wind-induced jumper; the design of the U-shaped structure can well improve the electric field distribution around the crossarm connecting fitting; in addition, through the improved design of the fitting structure and the selection of a suitable clamp form, the load-bearing capacity of the fitting is improved, so that it is applicable to the corner tower with a small angle, eliminating the jumper structure of the corner tower, making the conductor not need to be disconnected, reducing the construction complexity and improving the line reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0016] Figure 1 is a schematic perspective view of an embodiment of the composite crossarm fitting provided by the present invention;

[0017] Figure 2 is a schematic perspective view of another embodiment of the composite crossarm fitting provided by the present invention;

[0018] Figure 3 is a schematic perspective view of another embodiment of the composite crossarm fitting provided by the present invention;

[0019] Figure 4 is a schematic perspective view of yet another embodiment of the composite crossarm fitting provided by the present invention;

[0020] Figure 5 is a schematic perspective view of an embodiment of the crossarm assembly provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0024] Referring to Figure 1 , the present invention provides a composite cross-arm fitting 1001. The composite cross-arm fitting 1001 includes a first connector 1110, a second connector 1120, and a plurality of wire clamps 1101. The first connector 1110 is fixedly connected to the second connector 1120. The second connector 1120 includes at least one U-shaped structure 1102, and the wire clamps 1101 are fixedly connected to the second connector 1120. Compared with the traditional cylindrical fitting, the U-shaped fitting uses less material and is lighter in weight as a whole, and is also convenient for installation.

[0025] When the composite cross-arm fitting 1001 is used on an ordinary straight tower or when the gripping force requirement for the wire clamp 1101 is not high, an ordinary suspension wire clamp that is convenient for connection can be selected for the wire clamp 1101; when the fitting 1001 is applied to a strain tower or a corner tower or when the gripping force requirement for the wire clamp 1101 is relatively high, a strain wire clamp or a crimping type wire clamp with a larger gripping force can be selected, and specific limitations are not made here.

[0026] The first connecting member 1110 is used to fixedly connect the post insulator. The conductor is fixedly hung on the tower body through the post insulator. To make the connection between the composite cross arm and the transmission tower more stable, the composite cross arm fitting 1001 further includes a third connecting member 1130 that can be used to hang the stay insulator. The third connecting member 1130 can be connected to the first connecting member 1110 or the second connecting member 1120, or can be simultaneously connected to the first connecting member 1110 and the second connecting member 1120. The connection method between each connecting member can be fixedly connected by welding or connected by bolts, screws, etc. The connection method here can be adjusted according to actual needs and is not specifically limited. In a specific embodiment, to facilitate connection with the composite cross arm, the first connecting member 1110 can be selected as a flange tube structure. The first connecting member 1110 is fixedly connected to the end of the composite cross arm through the flange tube. The first connecting member 1110 and the second connecting member 1120 can be connected by bolts or flange plates, etc. According to different working conditions, the requirements for the load-bearing of the fitting are different. The number of the first connecting members 1110 included in each composite cross arm fitting 1001 can be one, two, or more. Each first connecting member 1110 connects one post insulator, and can well realize the supporting effect on the conductor.

[0027] The second connecting member 1120 is arranged horizontally. The second connecting member 1120 includes two horizontal portions 1121 and a bending portion 1122 (i.e., the closed end of the U-shaped structure). The two ends of the bending portion 1122 are respectively fixedly connected to the two horizontal portions 1121 to form an overall U-shaped structure 1102. The two horizontal portions 1121 are located in the same vertical plane, and an open end of the U-shaped structure is formed between the two horizontal portions 1121. The clamp 1101 is fixedly connected to the horizontal portion 1121 of the U-shaped structure 1102. The number of the clamps 1101 can be one, two, or more, and is used to fixedly connect each split conductor. When the number of the clamps 1101 is two or more, the two or more clamps 1101 are respectively arranged on the two horizontal portions 1121, which can make the force on the second connecting member 1120 more uniform. The second connecting member 1120 is arranged as a U shape, and the gap between the two horizontal portions 1121 in the U-shaped structure 1102 can be fully utilized to hang the clamp in different horizontal planes, so as to realize the hanging of multi-split conductors; at the same time, the closed end of the U-shaped fitting is similar to the shape of half a grading ring, and a better electric field closing effect can be achieved on the side connected to the cross arm, reducing the generation of electric field singularities and reducing the possibility of abnormal discharge.

[0028] The clamp 1101 and the second connecting member 1120 can be connected by welding, riveting, bolt connection, etc. A stable connection between the two is sufficient, and the specific connection method is not limited.

[0029] To make the overall structure of the composite cross-arm fitting 1100 more stable, a cover 1123 is provided at the open end of the U-shaped structure 1102 of the second connecting member 1120. The cover 1123 is fixedly connected to one end of the two horizontal portions 1121 away from the bending portion 1122, forming a good support at the open end to make the entire connection more stable. At the same time, the structure of the cover 1123 makes the U-shaped structure 1102 of the second connecting member 1120 a relatively closed structure, which can achieve a better electric field shielding effect.

[0030] In other embodiments, refer to Figure 2 , the composite cross-arm fitting 1002 includes a first connecting member 1110, a second connecting member 1120, and two third connecting members 1130. The third connecting members 1130 are disposed on the second connecting member 1120, and the two horizontal portions 1121 of the U-shaped structure 1102 are located in the same horizontal plane. The two third connecting members 1130 are respectively disposed at both ends of the bending portion 1122 of the U-shaped structure 1102, and the two third connecting members 1130 are arranged at a certain angle, so that the stay insulators hung on the two third connecting members 1130 and the iron tower form a triangular structure, thereby making the entire support structure more stable. The wire clips 1101 are respectively disposed on the two horizontal portions 1121. Along the advancing direction of the wire, the two wire clips 1101 corresponding to the two horizontal portions 1121 are used to hang the same wire, which can achieve a higher holding force on the wire, so that the composite cross-arm fitting 1002 can be applied to a small-angle corner tower without using jumper connections, greatly reducing the complexity of the wiring of the small-angle corner tower.

[0031] Of course, in other structures with low force requirements, the composite cross-arm fitting 1002 may also only include the first connecting member 1110 and the second connecting member 1120, or include the first connecting member 1110, the second connecting member 1120, and one third connecting member 1130. There is no specific limitation here, and it can be selected according to the actual situation.

[0032] Refer to Figure 1 , Figure 3 and Figure 4 , in order to enhance the load-bearing capacity of the composite cross-arm fitting, better withstand the tension of the wire, and more stably connect the wire, in another embodiment of the present invention, the composite cross-arm fitting 1100 includes two first connecting members 1110 and one second connecting member 1120. The second connecting member includes two U-shaped structures 1102 and several fourth connecting members 1140. The two U-shaped structures 1102 are arranged in parallel in the same direction and are connected to each other by several fourth connecting members 1140. The two ends of the fourth connecting member 1140 are respectively connected to the two corresponding horizontal portions 1121 of the two U-shaped structures 1102.

[0033] Specifically, according to different requirements, the fourth connecting member 1140 can beFigure 3 The slender cylindrical or cuboid structure in Figure 4 The flat plate structure in. When the fourth connecting member 1140 is a slender structure, the overall weight of the composite cross-arm fitting 1100 is relatively low, which can reduce costs; when the fourth connecting member 1140 is a flat plate structure, the support of the composite cross-arm fitting 1100 is more stable and the reliability is higher. Here, no specific restrictions are made on the specific shape and structure of the fourth connecting member 1140, and it can be selected according to the actual working conditions.

[0034] In this embodiment, due to the addition of the fourth connecting member 1140, the clamp 1101 can be arranged not only on the horizontal portion 1121 of the second connecting member 1120, but also on the fourth connecting member 1140. No specific restrictions are made here, and it is subject to the uniform and reasonable distribution of the clamp 1101 and the overall force of the composite cross-arm fitting 1100. The two U-shaped structures are arranged in parallel in the same direction, and two clamps are arranged on each horizontal portion 1121 of each U-shaped structure, so that two clamps can fix the same wire. At the same time, the entire composite cross-arm fitting 1100 can also be used for hanging four-split conductors, which can provide better support for a transmission line with a larger current capacity. In the case where the wire needs to achieve a small-angle turn, the reliability of wire fixation can be improved, the jumper structure of the corner tower can be omitted, so that the wire does not need to be disconnected, the construction complexity is reduced, and the line reliability is improved.

[0035] In this embodiment, the open end and the closed end of the bending portion 1122 are not in the same plane, the closed ends of the bending portions 1122 of the two U-shaped structures are far away from each other, and the two first connecting members 1110 are respectively connected to the two bending portions 1122 of the second connecting member 1120, which can make the two composite cross-arms connected to the fitting 1100 form a triangular structure, making the support of the entire structure more stable.

[0036] Since the clamp 1101 is directly connected to the composite cross-arm fitting 1100, the force transmission effect between the two is good, and the distance between the two is small, there is no problem of wind-induced jumper. Therefore, in the case of a small-angle turn of the wire, the wire can be directly connected to the clamp 1101, and a jumper-free and wire-disconnection-free structure can be realized, simplifying the overall structure and facilitating installation. At this time, a strain clamp with a relatively large gripping force should be selected for the clamp 1101.

[0037] As Figure 5 shown, the present invention also provides a cross-arm assembly 1000, including two post insulators 1200, two stay insulators 1300 and a composite cross-arm fitting 1100.

[0038] Specifically, the post insulator 1200 and the second connecting member are fixedly connected through the first connecting member, and the stay insulator 1300 and the third connecting member are fixedly connected. The combination of two post insulators 1200 and two stay insulators 1300 can stably support the conductor.

[0039] Of course, in other embodiments, when the clamp only bears the self-weight of the conductor, the cross-arm assembly can be a single-column cross-arm structure, including only one post insulator; alternatively, the cross-arm assembly can also include one stay insulator and one post insulator; in other cases with higher force requirements, the cross-arm assembly can further include three stay insulators and one post insulator. The number of stay insulators and post insulators included in the cross-arm assembly can be freely combined and will not be specifically limited here.

[0040] The present invention also provides a transmission tower (not shown in the figure), including a tower body (not shown in the figure) and a cross-arm assembly 1000. Through different combinations of the tower body and various embodiments in this application, the transmission tower can be a straight tower or a small-angle corner tower, and can be freely transformed here.

[0041] In summary, the composite cross-arm fitting, cross-arm assembly and transmission tower provided by the present invention can reduce the weight of the fitting and cost by designing a new type of composite cross-arm connecting fitting and integrally setting the conductor clamp and the composite cross-arm connecting member. At the same time, the distance between the conductor and the composite cross-arm can be effectively reduced, and the wind-induced jump wire problem can be effectively solved; the design of the U-shaped structure can well improve the electric field distribution around the cross-arm connecting fitting; in addition, through the improved design of the fitting structure and the selection of a suitable clamp form, the load-bearing capacity of the fitting is improved, making it applicable to small-angle corner towers, eliminating the jump wire structure of the corner tower, enabling the conductor to be continuous without interruption, reducing the construction complexity, and improving the line reliability.

[0042] The above is only the implementation mode of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A composite cross arm fitting, characterized in that, The fitting includes a first connecting piece, a second connecting piece and a plurality of wire clamps. The first connecting piece is fixedly connected to the second connecting piece. The second connecting piece includes at least one U-shaped structure. The wire clamps are fixedly connected to the second connecting piece, and the wire clamps are suspension wire clamps or strain wire clamps; Wherein, the U-shaped structure includes two horizontal parts and a bending part. The two ends of the bending part are respectively fixedly connected to the two horizontal parts to form the U-shaped structure, and the wire clamps are fixedly connected to the horizontal parts.

2. The composite cross-arm fitting according to claim 1, wherein, The fitting further includes a third connecting piece, and the third connecting piece is fixedly connected to the first connecting piece and / or the second connecting piece.

3. The composite cross-arm fitting according to claim 1, characterized in that, The first connecting piece is a flange cylinder. The number of the first connecting pieces is one, two or more. The first connecting pieces are fixedly connected to the closed end of the U-shaped structure by means of flange connection or welding.

4. The composite cross-arm fitting according to claim 1, characterized in that, The open end of the U-shaped structure is closed by a cover connection.

5. The composite cross-arm fitting according to claim 1, characterized in that The second connecting piece includes at least two of the U-shaped structures and a plurality of fourth connecting pieces. At least two of the U-shaped structures are arranged parallel to each other in the same direction and are connected to each other by the fourth connecting pieces.

6. A crossarm assembly, characterized in that, The cross-arm assembly includes at least two post insulators and the composite cross-arm fitting according to any one of claims 1 to 5. At least two of the post insulators are fixedly connected by the composite cross-arm fitting.

7. The cross arm assembly according to claim 6, characterized in that, The cross-arm assembly includes two of the post insulators and two stay insulators. The two post insulators and the two stay insulators are fixedly connected by the composite cross-arm fitting.

8. A transmission tower, characterized in that, The transmission tower includes a tower body and the cross-arm assembly according to any one of claims 6 to 7.

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