A terminal block

Abstract

The utility model provides a junction box. The junction box comprises a box body made of insulating material and a box cover arranged on the box body, a wiring cavity is arranged in the box body, a first insert is inlaid in one side wall of the box body forming the wiring cavity in X direction, a first mounting hole penetrating through in X direction is arranged on the first insert, b wire outlet holes are arranged on the bottom plate of the box body forming the wiring cavity, c second inserts are arranged in the box body, the first mounting hole and the second insert correspond to each other in Y direction, and a=b=c. The utility model sets the insert for mounting the cable and the three-phase outgoing line in the junction box, integrates the terminal block in the junction box, reduces the volume of the junction box, and thus reduces the space occupied by the junction box.

Description

Technical Field

[0001] This utility model relates to the field of traction motor wiring technology, and in particular to a junction box. Background Technology

[0002] With the rapid development of rail transit, higher reliability requirements have been placed on traction motors. One end of the motor lead is welded to the stator connection, while the other end is fixed inside the junction box, serving as the motor's electrical interface. The junction box is one of the important components of the motor; both the motor's electrical interface and the cable connection must be completed within the junction box.

[0003] Existing junction boxes are made of metal, requiring large electrical clearances for insulation, resulting in a large footprint. Additionally, the terminal blocks within these junction boxes are independent components, necessitating consideration of electrical clearances and mounting structures, also leading to a large footprint. Furthermore, the impulse voltage of three-phase and two-phase short circuits in permanent magnet motors is significantly higher than the intermediate voltage, making these independent terminal blocks prone to creepage breakdown. Utility Model Content

[0004] The purpose of this utility model is to provide a junction box that eliminates the need for a separate terminal block and integrates the terminal block into the junction box, thereby reducing the space occupied.

[0005] The technical solution of this utility model is: a junction box, including a box body made of insulating material and a cover on the box body. The box body has a wiring cavity. A first insert is embedded in one side wall of the box body forming the wiring cavity in the X direction. The first insert has a first mounting holes that pass through in the X direction. The bottom plate of the box body forming the wiring cavity has b outlet holes. The box body has c second inserts. The first mounting holes and the second inserts correspond one-to-one in the Y direction, a=b=c.

[0006] In the above solution, inserts for installing cables and three-phase leads are provided inside the junction box to integrate the terminal block inside the box, thereby reducing the volume of the junction box and the space occupied by the junction box.

[0007] Preferably, the box body is provided with a through hole extending along the Z direction, the through hole being distributed around the perimeter of the box body, and the two ends of the first insert are provided with second mounting holes extending along the Z direction, the second mounting holes being connected to the through hole.

[0008] Preferably, the box body is provided with a first rib extending in the Y direction and a second rib extending in the X direction, the second rib dividing the first rib into c segments, and a second insert is provided on the first rib of each segment.

[0009] Preferably, the upper end of the box body is fitted with a third insert for installing the box lid.

[0010] Preferably, a tightening member is installed in each of the first mounting holes, a cable passes through each tightening member, and a three-phase lead wire is installed in each outlet hole. The three-phase lead wires are connected to the second insert in a one-to-one correspondence with the cable.

[0011] Preferably, the three-phase lead wire has a first lead wire and a second lead wire. One end of the first lead wire is connected to the cable and attached to the second insert. The other end of the first lead wire is connected to one end of the second lead wire and located in the wiring cavity. The other end of the second lead wire passes through the outlet hole.

[0012] Preferably, the lower surface of the box cover is provided with an annular groove, and a sealing ring that abuts against the box body is embedded in the annular groove.

[0013] Compared with related technologies, the beneficial effects of this utility model are as follows: I. This utility model provides an insert for installing cables and three-phase leads inside the junction box, so as to integrate the terminal block inside the junction box, reduce the volume of the junction box, and thus reduce the space occupied by the junction box. II. In this utility model, each cable is fixed on a second insert, the second inserts are spaced apart on the first rib, and a second rib is also set between every two second inserts, thereby forming sufficient electrical clearance and creepage distance; 3. In this utility model, the cable is installed on the first insert through a tightening part, and then the first insert is fixed on the motor through the second mounting hole and the connected through hole, so as to realize the effective installation of the cable shielding mesh and realize the cable shielding grounding function. Fourth, the junction box of this utility model has a compact structure and occupies little space, reducing the volume by more than 50% compared to a metal junction box. Compared to a metal junction box + terminal block structure, the cost is reduced by more than 30%. Attached Figure Description

[0014] Figure 1 A schematic diagram of the junction box provided by this utility model; Figure 2 A schematic diagram of the internal structure of the junction box provided by this utility model; Figure 3 A schematic diagram of the junction box provided by this utility model without the cover; Figure 4 A structural schematic diagram of the box lid from a first-person perspective; Figure 5 A structural schematic diagram of the box lid from a second perspective; Figure 6 This is a structural diagram of the box. Figure 7 This is a schematic diagram of the structure of the first insert; Figure 8This is a schematic diagram of the structure of this utility model installed on a traction motor.

[0015] In the attached diagram: 1. Box body; 11. First insert; 111. First mounting hole; 112. Second mounting hole; 12. Second insert; 13. Third insert; 14. First rib; 15. Second rib; 16. Wiring cavity; 17. Outlet hole; 18. Through hole; 2. Box cover; 21. Recessed hole; 22. Stepped hole; 23. Annular groove; 3. Three-phase lead wire; 31. First lead wire; 32. Second lead wire; 4. Tightening component; 5. Cable; 6. Sealing ring; 7. Fastener; 10. Traction motor; 20. Junction box. Detailed Implementation

[0016] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0017] like Figure 1 , Figure 3 As shown, the junction box 20 provided in this embodiment includes a box body 1, a box cover 2, three-phase lead wires 3, a tightening component 4, and a cable 5.

[0018] like Figure 6 As shown, the housing 1 is made of insulating material and has a wiring cavity 16 inside. A first insert 11 is embedded in one side wall of the housing 1 in the X direction forming the wiring cavity 16. Figure 7 As shown, the first insert 11 has a first mounting hole 111 extending along the X direction, and the two ends of the first insert 11 have second mounting holes 112 extending along the Z direction. The box body 1 has through holes 18 extending along the Z direction around its perimeter. The second mounting holes 112 are connected to two of the through holes 18, and fasteners 7 are inserted into the through holes 18 to fix the junction box 20 to the motor, thereby fixing the cable shielding mesh.

[0019] like Figure 6 As shown, the bottom plate of the housing 1 forming the wiring cavity 16 has b outgoing holes 17. The housing 1 contains a first rib 14 extending along the Y direction and a second rib 15 extending along the X direction. The second rib 15 divides the first rib 14 into c segments, and each segment of the first rib 14 has a second insert 12. The first mounting holes 111 and the second inserts 12 correspond one-to-one in the Y direction. a=b=c=3.

[0020] like Figure 2 , Figure 3As shown, the outlet holes 17 are for the three-phase leads 3 to pass through. A tightening member 4 is installed in each of the first mounting holes 111, and a cable 5 passes through each tightening member 4. Each outlet hole 17 has a three-phase lead 3. The three-phase lead 3 has a first lead 31 and a second lead 32. One end of the first lead 31 is connected to the cable 5 to the second insert 12. The other end of the first lead 31 is welded to one end of the second lead 32 and is located in the wiring cavity 16. The other end of the second lead 32 exits from the outlet hole 17.

[0021] like Figure 6 As shown, a third insert 13 for mounting the lid 2 is fitted at the upper end of the box body 1. Figure 4 , Figure 5 As shown, the cover 2 is provided with a recessed hole 21, which corresponds to the wiring cavity 16 (e.g., Figure 2 (As shown). The box cover 2 has an annular groove 23, which is located on the outer periphery of the countersunk hole 21. A sealing ring 6 (O-ring) is embedded in the annular groove 23. The box cover 2 also has four stepped holes 22, which are aligned with the first insert 11 one by one, and then connected by fasteners 7 (e.g., ...). Figure 1 (As shown). After the lid 2 is connected to the body 1, the sealing ring 6 is tightly attached to the body 1.

[0022] like Figure 8 As shown, the junction box 20 is installed on the traction motor 10, and the three-phase lead wire 3 passing through the junction box 20 is connected to the motor cable.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A junction box, comprising a box body (1) made of insulating material and a cover (2) disposed on the box body (1), characterized in that, The box (1) is provided with a wiring cavity (16). A first insert (11) is embedded in one side wall of the box (1) forming the wiring cavity (16) in the X direction. The first insert (11) is provided with a first mounting holes (111) that pass through in the X direction. The bottom plate of the box (1) forming the wiring cavity (16) is provided with b outlet holes (17). The box (1) is provided with c second inserts (12). The first mounting holes (111) and the second inserts (12) correspond one-to-one in the Y direction, and a=b=c.

2. The junction box according to claim 1, characterized in that, The box body (1) is provided with a through hole (18) extending along the Z direction. The through hole (18) is located around the box body (1). The two ends of the first insert (11) are provided with a second mounting hole (112) extending along the Z direction. The second mounting hole (112) is connected to the through hole (18).

3. The junction box according to claim 1, characterized in that, The box (1) is provided with a first rib (14) extending in the Y direction and a second rib (15) extending in the X direction. The second rib (15) divides the first rib (14) into c segments, and a second insert (12) is provided on the first rib (14) of each segment.

4. The junction box according to claim 1, characterized in that, The upper end of the box body (1) is fitted with a third insert (13) for installing the box cover (2).

5. The junction box according to any one of claims 1-4, characterized in that, A screw fastener (4) is installed in each of the first mounting holes (111), a cable (5) passes through each screw fastener (4), and a three-phase lead wire (3) is installed in each outlet hole (17). The three-phase lead wire (3) and the cable (5) are connected to the second insert (12) in a one-to-one correspondence.

6. The junction box according to claim 5, characterized in that, The three-phase lead (3) has a first lead (31) and a second lead (32). One end of the first lead (31) is connected to the cable (5) on the second insert (12). The other end of the first lead (31) is connected to one end of the second lead (32) and located in the wiring cavity (16). The other end of the second lead (32) passes through the outlet hole (17).

7. The junction box according to any one of claims 1-4, characterized in that, The lower surface of the lid (2) is provided with an annular groove (23), and a sealing ring (6) that abuts against the box body (1) is embedded in the annular groove (23).

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