Terminal box device for current transformer

Abstract

The utility model discloses a terminal box device of current transformer, including the terminal box body of installation on motor casing, install in the terminal box body for connecting the three first wiring copper bar of stator lead wire beginning and cable, install in the terminal box body and connect the neutral point lead wire second wiring copper bar and cable, and the terminal box body is the cylindrical structure of inside hollow, still include the two first current transformers and a second current transformer of installation in the terminal box body close to motor casing side, two first current transformers arrange in the radial both sides of terminal box body, and the second current transformer arranges between two first current transformers, three first wiring copper bar and second wiring copper bar staggered arrangement and turn away from motor casing. The utility model provides a terminal box device of current transformer, compact structure, convenient installation, improve installation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and specifically relates to a junction box device for a current transformer. Background Technology

[0002] To connect the motor to external circuits, a junction box needs to be installed on the motor housing. Considering factors such as space layout, installation, and vibration / impact conditions, cylindrical junction boxes are required in various situations.

[0003] In existing technologies, such as Figure 1 As shown, the junction box structure of the motor includes a junction box body 100, a first copper busbar 200 installed in the upper part of the junction box body 100, a second copper busbar 300 installed in the lower part of the junction box body 100, and three current transformers 400 arranged between the first copper busbar 200 and the second copper busbar 300. The three current transformers 400 are arranged side by side. The stator lead 500 led out from the motor housing 800 passes through the corresponding current transformer and is fixedly connected to the lead-out end of the corresponding first copper busbar 200. The neutral point lead 600 led out from the motor housing 800 passes through the corresponding current transformer and is fixedly connected to the second copper busbar 300. The cable 700 branches into three cable leads 701, which pass through the corresponding current transformers and are fixedly connected to the lead-in end of the corresponding first copper busbar 200.

[0004] However, due to the small distance between the bottom of the junction box and the current transformer, after the cable head is made inside the junction box, it is divided into three cable leads. The distance between the cable and the current transformer is even smaller, which makes on-site wiring difficult and affects work efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a junction box device for a current transformer, which solves the problem of difficult wiring of motor power supply.

[0006] Based on the above problems, the technical solution provided by this utility model is as follows:

[0007] The junction box assembly of the current transformer includes a junction box body mounted on the motor housing, three first copper busbars mounted in the junction box body for connecting the stator lead start and the cable, a second copper busbar mounted in the junction box body for connecting the neutral point lead and the cable, and the junction box body is a hollow cylindrical structure.

[0008] It also includes two first current transformers and one second current transformer installed on the side of the junction box near the motor housing. The two first current transformers are arranged on both radial sides of the junction box, and the second current transformer is arranged between the two first current transformers.

[0009] The three first copper busbars are staggered with the second copper busbars and are away from the motor housing;

[0010] Each stator lead extending from the motor housing passes through the corresponding current transformer and is fixedly connected to the lead-out end of the corresponding first copper busbar; each neutral point lead extending from the motor housing passes through the corresponding current transformer and is fixedly connected to the second copper busbar; the three cable leads extending from the cable are respectively fixedly connected to the lead-in end of the corresponding first copper busbar.

[0011] In some embodiments, the junction box includes a cylindrical body, a mounting base disposed at one axial end of the cylindrical body, and a cover plate disposed at the other axial end of the cylindrical body, wherein the mounting base is detachably connected to the motor housing.

[0012] In some embodiments, the first current transformer is mounted on the mounting base via a first bracket, the first bracket including a first fixing plate and a first mounting plate connected in an L-shape, the first fixing plate being detachably connected to the mounting base and having a first through hole for the stator lead start and neutral point lead to pass through, and the first current transformer being detachably connected to the first mounting plate.

[0013] In some embodiments, the second current transformer is mounted on the mounting base via a second bracket. The second bracket includes a second fixing plate and a second mounting plate connected in an L-shape. The second fixing plate is detachably connected to the mounting base and has a second through hole for the stator lead start and center point lead to pass through. The second current transformer and the first terminal copper busbar are detachably connected to the second mounting plate. A transformer junction box is provided on the outer wall of the cylinder, and the second mounting plate has a through hole for the transformer wiring to pass through.

[0014] In some embodiments, a reinforcing rib assembly is connected between the second fixing plate and the second mounting plate.

[0015] In some embodiments, the reinforcing rib assembly includes two reinforcing plates arranged on both sides of the second current transformer.

[0016] In some embodiments, the second wiring busbar is mounted on the inner wall of the cylinder via a third bracket. Connecting plates are welded to both sides of the inner wall of the cylinder. The third bracket is in the shape of a long strip and its two ends are detachably connected to the two connecting plates.

[0017] In some embodiments, the mounting base includes a first base plate detachably connected to a flange on the outer periphery of a mounting hole on the motor housing, and a second base plate disposed on the outer periphery of the first base plate and fixedly connected to the cylinder, the second base plate being detachably connected to the motor housing.

[0018] In some embodiments, a first stepped sealing groove is provided between the first base plate and the motor housing, and between the second base plate and the motor housing, and a first sealing ring is provided in the first stepped sealing groove.

[0019] In some embodiments, a second stepped sealing groove is provided between the cover plate and the cylinder, and a second sealing ring is provided in the second stepped sealing groove.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] 1. Install three current transformers on the side of the junction box near the motor housing, including two first current transformers located on both radial sides and a second current transformer located between the two first current transformers, which facilitates the arrangement of current transformers in the circular junction box and the connection of various lines, thereby improving installation efficiency.

[0022] 2. The first and second supports have a compact structural arrangement and high structural strength;

[0023] 3. The mounting base of the junction box is divided into a first mounting plate and a second mounting plate, which facilitates the connection and installation between the junction box and the motor housing;

[0024] 3. Stepped sealing grooves and sealing rings are provided on the mounting surface between the junction box and the motor housing, and on the mounting surface between the cover plate and the cylinder, respectively, to improve the sealing performance of the junction box. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is one of the structural diagrams of the installation structure of a current transformer in the prior art;

[0027] Figure 2 This is one of the structural schematic diagrams of the junction box device of the current transformer of this utility model;

[0028] Figure 3 This is a second structural schematic diagram of an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0030] Figure 5 for Figure 4Enlarged view of a section at point I;

[0031] Figure 6 This is one of the structural schematic diagrams of the first bracket in the embodiments of this utility model;

[0032] Figure 7 This is a second schematic diagram of the structure of the first bracket in the embodiments of this utility model;

[0033] Figure 8 This is the third structural schematic diagram of the first bracket in the embodiments of this utility model;

[0034] Figure 9 This is one of the structural schematic diagrams of the second bracket in the embodiments of this utility model;

[0035] Figure 10 This is the second structural schematic diagram of the second bracket in the embodiments of this utility model;

[0036] Figure 11 This is the third structural schematic diagram of the second bracket in the embodiments of this utility model;

[0037] Figure 12 This is a schematic diagram of the installation structure of an embodiment of the present utility model;

[0038] Figure 13 for Figure 12 Enlarged view of section II in the middle;

[0039] in:

[0040] 100. Junction box; 200. First terminal busbar; 300. Second terminal busbar; 400. Current transformer; 500. Stator lead start; 600. Neutral point lead; 700. Cable; 701. Cable lead; 800. Motor housing;

[0041] 1. Junction box body; 1-1. Cylinder; 1-2. Mounting base; 1-2a. First mounting plate; 1-2b. Second mounting plate; 1-2c. First stepped sealing groove; 1-3. Cover plate; 1-3a. Second stepped sealing groove; 2. First wiring copper busbar; 3. Second wiring copper busbar; 4. First current transformer; 5. Second current transformer; 6. First bracket; 6-1. First fixing plate; 6-1a. First through hole; 6-2. First mounting plate; 7. Second bracket; 7-1 Second fixing plate; 7-1a Second through hole; 7-2 Second mounting plate; 7-2a Wire hole; 7-3 Reinforcing plate; 8 Third bracket; 9 Stator lead start; 10 Neutral point lead; 11 Cable; 11-1 Cable lead; 12 First insulator; 13 Second insulator; 14 Horn connector; 15 First sealing ring; 16 Second sealing ring; 17 Motor housing; 18 Current transformer junction box; 19 Connecting plate. Detailed Implementation

[0042] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0043] See Figures 3 to 5 , Figure 12 This is a structural schematic diagram of an embodiment of the present utility model, which provides a junction box device for a current transformer, including a junction box body 1 installed on a motor housing 17, three first copper busbars 2 installed in the junction box body 1 for connecting the stator lead start end 9 to the cable 11, a second copper busbar 3 installed in the junction box body 1 for connecting the neutral point lead 10, two first current transformers 4 and one second current transformer 5 installed in the junction box body 1, and the cable 11.

[0044] The junction box 1 is an internal cylindrical structure, including a cylindrical body 1-1, a mounting base 1-2 disposed at one axial end of the cylindrical body 1-1, and a cover plate 1-3 disposed at the other axial end of the cylindrical body 1-1, wherein the mounting base 1-2 is detachably connected to the motor housing 17.

[0045] Two first current transformers 4 and one second current transformer 5 are installed on the side of the junction box 1 near the motor housing 17. Three first copper busbars 2 and second copper busbars 3 are arranged alternately and away from the motor housing 17 to form a structure of three sections: current transformers, first copper busbars 2, and second copper busbars 3.

[0046] The first current transformer 4 is mounted on the mounting base 1-2 via the first bracket 6, such as Figures 6 to 8 As shown, the first bracket 6 includes a first fixing plate 6-1 and a first mounting plate 6-2 connected in an L-shape. The first fixing plate 6-1 is detachably connected to the mounting base 1-2 by bolts. The first fixing plate 6-1 is provided with a first through hole 6-1a for the stator lead start end 9 and the neutral point lead 10 to pass through. The first current transformer 4 is detachably connected to the first mounting plate 6-2 by bolts.

[0047] The second current transformer 5 is mounted on the mounting base via the second bracket 7, such as Figures 9 to 11As shown, the second bracket 7 includes a second fixing plate 7-1 and a second mounting plate 7-2 connected in an L-shape. The second fixing plate 7-1 is detachably connected to the mounting base 1-2 by bolts. The second fixing plate 7-1 has a second through hole 7-1a for the stator lead 9 and the neutral point lead 10 to pass through. The second current transformer 5 and the first terminal copper busbar 2 are detachably connected to the second mounting plate 7-2 by bolts. A transformer junction box 18 is provided on the outer wall of the cylinder 1-1. To facilitate the introduction of transformer wiring, the second mounting plate 7-2 has a through hole 7-2a for the transformer wiring to pass through.

[0048] To improve the stability of the second support 7 structure, a reinforcing rib assembly is provided between the second fixing plate 7-1 and the second mounting plate 7-2. Specifically, the reinforcing rib assembly includes two reinforcing plates 7-3 arranged on both sides of the second current transformer 5.

[0049] To facilitate the installation of the junction box 1, the mounting base 1-2 includes a first base plate 1-2a that is detachably connected to the outer flange of the mounting hole on the motor housing 17, and a second base plate 1-2b that is arranged on the outer periphery of the first base plate 1-2a and welded to the cylinder 1-1. The second base plate 1-2b is detachably connected to the motor housing 17. The first base plate 1-2a and the second base plate 1-2b are detachably connected to the motor housing 17 by bolts. The first bracket 6 and the second bracket 7 are bolted onto the first base plate 1-2a.

[0050] Each first copper busbar 2 includes an outgoing end and an incoming end. Preferably, the first copper busbar 2 is U-shaped and is fixed inside the junction box 1 by a first insulator assembly. The first insulator assembly includes two first insulators 12 arranged side by side. The first insulators 12 are fixed on the second bracket 7 by screws. The first copper busbar 2 is fixedly connected to the first insulators 12 by screws.

[0051] The second copper busbar 3 is mounted on the cylinder 1-1 via the third bracket 8. Specifically, connecting plates 19 are welded to both sides of the inner wall of the cylinder 1-1. The first bracket 8 is a long strip structure, and its two ends are detachably connected to the two connecting plates 19 by bolts. The second copper busbar 3 is fixed in the lower part of the junction box 1 and is staggered with multiple first copper busbars 2, that is, the second copper busbar 3 is arranged diagonally below the multiple first copper busbars 2. Preferably, the second copper busbar 3 is long and strip-shaped and is fixed in the junction box 1 via a second insulator assembly. The second insulator assembly includes multiple second insulators 13 arranged at intervals. The multiple second insulators 13 are respectively fixed to the third bracket 8 by screws, and the second copper busbar 3 is fixedly connected to the second insulators 13 by screws.

[0052] To improve the sealing performance of the junction box, such as Figure 4As shown, a first stepped sealing groove 1-2c is provided between the first base plate 1-2a and the motor housing 17, and between the second base plate 1-2b and the motor housing 17, respectively. A first sealing ring 15 is also provided within the first stepped sealing groove 1-2c. Figure 13 As shown, a second stepped sealing groove 1-3a is provided between the cover plate 1-3 and the cylinder 1-1, and a second sealing ring 16 is provided in the second stepped sealing groove 1-3a.

[0053] There are three stator lead ends 9, which are led out from the motor housing 17 to the junction box 1. Each stator lead end 9 passes through the corresponding current transformer and is connected to the lead end of the corresponding first copper busbar 2.

[0054] There are three neutral point leads 10, which are led out from the motor housing 17 to the junction box 1. Each neutral point lead 10 passes through the corresponding current transformer and is fixedly connected to the second copper busbar 3.

[0055] The cable 11 extends into the junction box 1 via the horn-shaped connector 14. Three cable leads 11-1 are separated at the cable head position, and the three cable leads 11-1 are fixedly connected to the corresponding first terminal copper busbar 2.

[0056] During on-site wiring, the single armored cable 11 is passed through the flared connector 14 at the bottom of the junction box 1. After the cable head is made, it is divided into three cable leads 11-1. Since it is located in a different area from the current transformer, the first copper busbar 2, and the second copper busbar 3 inside the circular junction box, the stator lead 9 has already passed through the corresponding current transformer before being fixed to the first copper busbar 2. The single cable lead 11-1 is directly fixed to the lead end of the first copper busbar 2 with a copper terminal. At this time, since there is a large space between the bottom of the junction box 1 and the first copper busbar 2, it is convenient to install the cable leads.

[0057] In summary, this junction box device has a compact structure, facilitates wiring, and improves installation efficiency.

[0058] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A junction box assembly for a current transformer, comprising a junction box body mounted on a motor housing, three first copper busbars mounted inside the junction box for connecting the stator lead ends and a cable, a second copper busbar mounted inside the junction box for connecting the neutral point lead, and a cable, characterized in that: The junction box is a hollow cylindrical structure. It also includes two first current transformers and one second current transformer installed on the side of the junction box near the motor housing. The two first current transformers are arranged on both radial sides of the junction box, and the second current transformer is arranged between the two first current transformers. The three first copper busbars are staggered with the second copper busbars and are away from the motor housing; Each stator lead extending from the motor housing passes through the corresponding current transformer and is fixedly connected to the lead-out end of the corresponding first copper busbar; each neutral point lead extending from the motor housing passes through the corresponding current transformer and is fixedly connected to the second copper busbar; the three cable leads extending from the cable are respectively fixedly connected to the lead-in end of the corresponding first copper busbar.

2. The junction box device for the current transformer according to claim 1, characterized in that: The junction box includes a cylindrical body, a mounting base disposed at one axial end of the cylindrical body, and a cover plate disposed at the other axial end of the cylindrical body. The mounting base is detachably connected to the motor housing.

3. The junction box device for the current transformer according to claim 2, characterized in that: The first current transformer is mounted on the mounting base via a first bracket. The first bracket includes a first fixing plate and a first mounting plate connected in an L-shape. The first fixing plate is detachably connected to the mounting base and has a first through hole for the stator lead start and neutral point lead to pass through. The first current transformer is detachably connected to the first mounting plate.

4. The junction box device for the current transformer according to claim 2, characterized in that: The second current transformer is mounted on the mounting base via a second bracket. The second bracket includes a second fixing plate and a second mounting plate connected in an L-shape. The second fixing plate is detachably connected to the mounting base and has a second through hole for the stator lead start and center point lead to pass through. The second current transformer and the first terminal copper busbar are detachably connected to the second mounting plate. A transformer junction box is provided on the outer wall of the cylinder. The second mounting plate has a through hole for the transformer wiring to pass through.

5. The junction box device for the current transformer according to claim 4, characterized in that: A reinforcing rib assembly connects the second fixing plate and the second mounting plate.

6. The junction box device for a current transformer according to claim 5, characterized in that: The reinforcing rib assembly includes two reinforcing plates arranged on both sides of the second current transformer.

7. The junction box device for the current transformer according to claim 3, characterized in that: The second copper busbar is installed on the inner wall of the cylinder via the third bracket. Connecting plates are welded to both sides of the inner wall of the cylinder. The third bracket is in the shape of a long strip and its two ends are detachably connected to the two connecting plates.

8. The junction box device for the current transformer according to claim 3, characterized in that: The mounting base includes a first base plate detachably connected to the outer flange of the mounting hole on the motor housing, and a second base plate arranged on the outer periphery of the first base plate and fixedly connected to the cylinder. The second base plate is detachably connected to the motor housing.

9. The junction box device for a current transformer according to claim 8, characterized in that: A first stepped sealing groove is provided between the first base plate and the motor housing, and between the second base plate and the motor housing, and a first sealing ring is provided in the first stepped sealing groove.

10. The junction box device for a current transformer according to claim 9, characterized in that: A second stepped sealing groove is provided between the cover plate and the cylinder, and a second sealing ring is provided in the second stepped sealing groove.

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