Wire connecting device and transformer thereof

Abstract

The utility model discloses a wire connecting device and a transformer thereof. The wire connecting device comprises clamping assemblies arranged at the two ends of a clamping sleeve in pairs; the clamping assembly comprises a connector, a clamping ring and a spring. The free end of the tapping lead is inserted into the joint and is in cold pressing connection with the joint; the clamping rings are vertically inserted into the two ends of the clamping sleeve and detachably connected with the connectors inserted into the two end faces of the clamping sleeve in a locked mode. The two ends of the spring abut against the clamping ring and the clamping sleeve respectively. The device can realize reliable connection of the tapping line and the external lead of the transformer coil, ensures insulation, is convenient to disassemble and assemble, and can effectively improve the disassembly and assembly efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a wire connection device and a transformer thereof. Background Art

[0002] Transformer coils are typically wound with copper conductors. With the increasing transmission radius and user demands for more stable power supply, most transformers now use on-load tap changers for voltage regulation. This requires an on-load tap changer (OTC) to connect the transformer phases. Copper tap wires are used to connect the on-load tap changer to the transformer coils. The transformer coils are divided into three phases: A, B, and C. Multiple tap wires are required for each phase, ranging from as few as five to as many as 10 to 20.

[0003] The existing tap-off connection method involves prefabricating terminals near the on-load tap changer using cold crimping for bolted connection to the tap changer. The tap-off terminals near the transformer coil leads are fixed using welding or cold crimping. This prefabrication of the terminals is time-consuming and labor-intensive, hindering assembly efficiency.

[0004] During transformer operation, if a transformer tap lead needs to be replaced due to a fault, specialized welding equipment is required for removal and replacement, making the operation extremely inconvenient. This can take up to a week, especially when a large number of tap leads need to be removed and installed. This can severely impact normal power supply, delaying power restoration and delaying power supply.

[0005] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Utility Model Content

[0006] This application addresses the above technical issues and provides a wire connection device and transformer thereof, which are used for connecting tap wires near the transformer coil end, are easy to assemble and disassemble, and effectively improve work efficiency. If a transformer tap wire needs to be replaced due to a fault, the tap wires can be prefabricated in advance, saving troubleshooting time.

[0007] The present application provides a wire connection device, comprising: a clamping assembly provided in pairs on both ends of a clamping sleeve; the clamping assembly comprises: a connector, a clamping ring, and a spring; the free end of the tapped lead is inserted into the connector and cold-pressed to connect the connector;

[0008] The clamping rings are vertically inserted at both ends of the ferrule and are connected to the joints inserted into the two end surfaces of the ferrule in a disassembly and locking manner;

[0009] The two ends of the spring are respectively in contact with the clamping ring and the clamping sleeve.

[0010] Preferably, the clamping ring includes: a ring body, a push block, and a limit plate; a push block is arranged on the top surface of the ring body; a limit plate is arranged on the bottom surface of the ring body; a plurality of clamping protrusions are arranged circumferentially on the inner wall of the ring body; the clamping protrusions extend into the inner wall of the clamping sleeve and are clamped with the joint for disassembly.

[0011] Preferably, one end of the connector is open and the other end is closed; the tap lead is inserted into the open end and cold-pressed to the closed end; a plurality of guide grooves are circumferentially spaced on the outer wall of the closed end of the connector; and the snap-fitting protrusion is snap-fitted to the guide groove.

[0012] Preferably, the guide groove comprises: a groove body, a locking groove, and a wide-mouth groove; the outer end of the groove body is provided with a wide-mouth groove with an open side wall; a locking groove is vertically provided on the side wall of the groove body near the closed end;

[0013] When locked, the locking protrusion is locked in the locking groove.

[0014] Preferably, a disassembly and pushing direction indication mark is provided on the pushing block.

[0015] Preferably, a wear-resistant pattern is provided on the top of the push block;

[0016] A through slot is arranged on the middle side wall of the push block; a limiting column is arranged on the inner side wall of the through slot; and a flange is arranged on the upper part of the through slot.

[0017] Preferably, a snap ring groove is provided on the side wall of the ferrule; the snap ring is rotatably inserted into the snap ring groove.

[0018] Preferably, the retaining ring groove includes: a ring groove, a slot, and a limit groove; the slot is set at one end of the ring groove, and the limit groove is set on the other opposite end; the limit plate is inserted into the limit groove; the push block extends out of the slot and is set on the outer wall of the sleeve.

[0019] Preferably, at least two observation holes are provided on the side wall of the closed end of the joint.

[0020] Another aspect of the present application provides a transformer, comprising: multiple on-load tap-changers, transformer coils, and multiple wire connection devices as described above; the free ends of the phase tap leads of the transformer coils are electrically connected to the on-load tap-changers through the wire connection devices.

[0021] The beneficial effects of this application include:

[0022] 1) The wire connection device provided in this application can achieve reliable connection between the tap wire and the external lead of the transformer coil while ensuring insulation. The device is easy to assemble and disassemble, which can effectively improve the efficiency of disassembly and assembly and shorten the disassembly and assembly operation time by more than 50%.

[0023] 2) The wire connection device provided in this application realizes the electrical connection of the wires by means of the closed end of the copper material provided in the connector, and realizes the disassembly and locking connection by means of the ferrule and the clamping ring cooperating with the connector, which facilitates disassembly and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of the wire connecting device in the installed state in at least one embodiment provided in the present application;

[0025] Figure 2 for Figure 1 A local enlarged structural diagram of point A;

[0026] Figure 3 A schematic diagram of the three-dimensional structure of a clasp in at least one embodiment provided in this application;

[0027] Figure 4 A schematic diagram of the ferrule structure in at least one embodiment provided in this application; a) is a main view; b) is a cross-sectional view taken along the line AA in FIG a;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of a joint in at least one embodiment provided in this application;

[0029] Figure 6 A schematic diagram of an exploded three-dimensional structure of a wire connection device in at least one embodiment provided in the present application;

[0030] Figure 7 A front view of a wire connection device in at least one embodiment provided in the present application; a) is a front view; b) is a cross-sectional view taken along the line AA in FIG a;

[0031] Legend:

[0032] Connector 1, guide groove 11, observation hole 121, connecting hole 122, lock groove 111, wide-mouth groove 112, ferrule 2, snap ring groove 212, through cavity 22, slot 213, limit groove 214, snap ring 3, first snap ring 31, second snap ring 32, limit column 311, snap-fit protrusion 312, ring body 33, push block 32, limit plate 34, through groove 321, flange 322, spring 4. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in this field, and can be implemented in a variety of common knowledge settings.

[0036] See also Figures 1 to 5 The wire connection device provided in this application includes: a pair of clamping assemblies arranged at both ends of a ferrule 2; the clamping assembly at one end is used to clamp the tapping wire to one end connected to the ferrule 2; the clamping assembly at the other end is used to clamp the transformer coil external lead to the other end connected to the ferrule 2; a pair of clamping ring grooves 212 are provided on the side walls of the ferrule 2. The interior of the ferrule 2 is hollow to allow the clamping assemblies at both ends to be inserted therein. The side walls of the ferrule 2 are made of copper material to facilitate electrical connection with the clamping assemblies. The clamping assembly includes: a connector 1, a clamping ring 3, and a spring 4; a guide groove 11 is provided on the side wall of the plug-in end of the connector 1, which is filled with copper material and connected to the side wall of the connector 1 to achieve electrical connection with the ferrule 2. The other end of the connector 1 is open and has a connection hole 122 for connecting to the wire. The bottom of the connection hole 122 is provided with an observation hole 121 to facilitate observation of the connection between the guide and the copper material during assembly.

[0037] The snap ring 3 is inserted into the snap ring groove 212 provided on the ferrule 2; the snap ring 3 comprises: a ring body 33, a push block 32, and a limit plate 34; the push block 32 is provided on the top surface of the ring body 33; the limit plate 34 is provided on the bottom surface of the ring body 33; and a plurality of snap-fit protrusions 312 are provided on the inner wall of the ring body 33 at intervals in the circumferential direction.

[0038] A snap ring groove 212 and a limiting groove 214 are symmetrically arranged on opposite side walls of the ferrule 2. After the top of the snap ring 3 is inserted into the snap ring groove 212, the inner cavity of the ring body 33 is aligned with the inner wall of the through cavity 22 of the ferrule 2. The engaging protrusion 312 extends into the through cavity 22. The limiting plate 34 is inserted into the limiting groove 214. The push block 32 is arranged outside the snap ring groove 212. The snap ring groove 212 includes an annular groove and a slot 213. The annular groove is provided on the cylindrical wall of the ferrule 2. The slot 213 is provided on one side of the cylindrical wall of the ferrule 2 and communicates with the annular groove. The ferrule 2 between the bottom of the annular groove and the limiting groove 214 is not open to provide support for the snap ring 3.

[0039] In one embodiment, a pattern is provided on the top of the push block 32 to increase the friction force when the push block 32 is operated.

[0040] In one embodiment, the width of one side of the locking protrusion 312 facing the wide slot 112 is smaller than the other side, so as to facilitate pushing the connector 1 into the locking ring 3 during the locking process.

[0041] In a specific embodiment, an indicator arrow is provided on the side wall of the push block 32 to facilitate the installer to know the operation direction for releasing the lock between the connector 1 and the ferrule 2 after pushing.

[0042] In one embodiment, a through-slot 321 is provided at the bottom of the push block 32. A flange 322 is provided on one sidewall of the through-slot 321, and a limiting post 311 is provided on the inner sidewall of the flange 322. The flange 322 and the push block 32 are accommodated within the slot 213. A spring 4 is accommodated within the slot 213. One end of the spring 4 is elastically connected to the limiting post 311 on the flange 322, and the other end is elastically connected to the inner sidewall of the slot 213. This effectively limits the position of the snap ring 3.

[0043] In a specific embodiment, the clamping ring 3 is made of elastic material, and the connector 1 and the clamping sleeve 2 are both made of copper.

[0044] In a specific embodiment, the snap ring 3 includes: a first snap ring 31 and a second snap ring 32; snap ring grooves 212 are symmetrically provided at both ends of the ferrule 2; the first snap ring 31 and the second snap ring 32 are respectively inserted into and locked with the connectors 1 at both ends.

[0045] In a specific embodiment, the guide groove 11 includes: a groove body, a locking groove 111, and a wide-mouth groove 112; a wide-mouth groove 112 is provided on one end of the groove body close to the ferrule 2 to facilitate the snapping protrusion 312 on the snap ring 3 to enter the groove body; a locking groove 111 is provided on one side wall of the groove body and extends perpendicularly to the groove body. Since the restoring force of the spring 4 keeps pushing the snap ring 3 to rotate, the snap ring 3 cannot rotate due to the limiting effect of the groove body. When the snapping protrusion 312 on the snap ring 3 moves along the groove body to the locking groove 111, the snapping protrusion 312 is snapped into the locking groove 111, thereby realizing the locking connection between the connector 1 and the ferrule 2.

[0046] In a specific embodiment, the groove entrance on the ferrule 2 is larger than the maximum outer diameter of the snap ring 3 so that the snap ring 3 can be normally inserted.

[0047] During use, the free end of the wire is inserted into the connection hole 122 of the connector 1. After confirming that the wire insertion surface is in contact with the copper surface of the closed end of the connector 1 through the observation hole 121, the connector 1 and the wire are connected by cold pressing to ensure the installation reliability of the cold pressing. The above steps are repeated for the connector 1 at the other end to connect to the wire. This structure eliminates the need for prefabricated connectors for the wires, effectively shortening assembly time, improving efficiency, and enhancing the uniformity of the assembled product.

[0048] Insert the snap ring 3 into the snap ring groove 212 of the ferrule 2, and install the spring 4 in the snap ring groove 212. The front end of the spring 4 is installed on the upper limit post 311 on the snap ring 3, and the other end is installed on the inner wall of the snap ring groove 212. Insert the insertion end of the connector 1 with the guide groove 11 into the ferrule 2, and rotate the connector 1 so that the guide groove 11 is facing the snapping protrusion 312 on the snap ring 3. Under the thrust of the restoring force of the spring 4 that pushes the snap ring 3 to rotate circumferentially around the central axis of the ferrule 2, the snapping protrusion 312 on the snap ring 3 is pushed into the locking groove 111 on one side of the guide groove 11 of the connector 1 to achieve a locked connection.

[0049] When disassembly is required, push the snap ring 3 forward in the direction indicated by the arrow on the snap ring 3 to release the locking protrusion 312 on the snap ring 3 from the locking groove 111, and pull out the connector 1 to separate the connector 1 from the ferrule 2.

[0050] Another aspect of the present application provides a transformer, comprising: multiple on-load tap-changers, transformer coils, and multiple wire connection devices as described above; the free ends of the phase tap leads of the transformer coils are electrically connected to the on-load tap-changers through the wire connection devices.

[0051] The device is used to assemble and connect the tap leads of each phase of the transformer coil, which is convenient for assembly and disassembly, and improves the assembly and maintenance efficiency.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wire connecting device, characterized in that: include: The clamping components are arranged in pairs on both ends of the clamping sleeve (2); the clamping components include: a connector (1), a clamping ring (3), and a spring (4); the free end of the branch lead is inserted into the connector (1) and cold-pressed to connect to the connector (1); The clamping ring (3) is vertically inserted at both ends of the clamping sleeve (2) and is detachably locked with the connector (1) inserted into the two end surfaces of the clamping sleeve (2); The two ends of the spring (4) are respectively in contact with the clamping ring (3) and the clamping sleeve (2).

2. The wire connection device according to claim 1, wherein: The clamping ring (3) comprises: a ring body (33), a push block (32), and a limit plate (34); the push block (32) is arranged on the top surface of the ring body (33); the limit plate (34) is arranged on the bottom surface of the ring body (33); a plurality of clamping protrusions (312) are arranged on the inner side wall of the ring body (33); the clamping protrusions (312) extend into the inner wall of the clamping sleeve (2) and are detachably clamped to the joint (1).

3. The wire connection device according to claim 2, wherein: One end of the connector (1) is open, and the other end is a closed end; the tapping lead is inserted into the open end and connected to the closed end by cold pressing; a plurality of guide grooves (11) are arranged at intervals on the outer side wall of the closed end of the connector (1); and the clamping protrusion (312) is detachably clamped to the guide groove (11).

4. The wire connection device according to claim 3, wherein: The guide groove (11) comprises: a groove body, a locking groove (111), and a wide-mouth groove (112); the wide-mouth groove (112) with an open side wall is provided at the outer end of the groove body; the locking groove (111) is vertically provided on the side wall of the groove body near the closed end; When locked, the locking protrusion (312) is locked in the locking groove (111).

5. The wire connection device according to claim 2, wherein: The push block (32) is provided with a disassembly and pushing direction indication mark.

6. The wire connection device according to claim 2, wherein: The top of the push block (32) is provided with a wear-resistant pattern; A through slot (321) is provided on the middle side wall of the push block (32); a limiting column (311) is provided on the inner side wall of the through slot (321); and a flange (322) is provided on the upper portion of the through slot (321).

7. The wire connection device according to claim 2, wherein: A snap ring groove (212) is provided on the side wall of the clamping sleeve (2); the snap ring (3) is rotatably inserted into the snap ring groove (212).

8. The wire connection device according to claim 7, characterized in that: The snap ring groove (212) comprises: a ring groove, an opening (213), and a limiting groove (214); the opening (213) is provided at one end of the ring groove, and the limiting groove (214) is provided at the other opposite end; the limiting plate (34) is inserted into the limiting groove (214); the push block (32) extends out of the opening (213) and is provided on the outer wall of the clamping sleeve (2).

9. The wire connection device according to claim 3, characterized in that: At least two observation holes (121) are provided on the side wall of the closed end of the joint (1).

10. A transformer, characterized in that: include: A plurality of on-load tap-changers, transformer coils, and a plurality of wire connection devices according to any one of claims 1 to 9; the free ends of the phase tap leads of the transformer coils are electrically connected to the on-load tap-changers via the wire connection devices.

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