Outgoing line junction box

Abstract

The utility model relates to an outgoing line junction box, which comprises a box body with an opening at the top, a box cover arranged at the top of the box body, and a junction device positioned in an inner cavity of the box body, the bottom of the box body is provided with a stator outgoing line outlet, and the opposite side walls of the box body are provided with cable outlets; the wiring device comprises a three-phase copper bar and a copper bar support used for supporting the three-phase copper bar, the three-phase copper bar is divided into a U-phase copper bar, a V-phase copper bar and a W-phase copper bar which are arranged in parallel, and a plurality of power connection bolts are arranged on the two faces of each phase of copper bar. According to the utility model, the internal space of the junction box occupied by the wiring terminal can be reduced, and the size of the junction box can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an outlet terminal box. Background Art

[0002] Industrial motors are often large in power, with the power of a single motor ranging from tens of kilowatts to hundreds of kilowatts, or even megawatts. The working current of a single motor also ranges from hundreds of amperes to thousands of amperes. Due to the large current, the lead-out cable of the motor is also very thick, which brings certain difficulties to the production of the cable. In order to facilitate the manufacture of cables, the thicker lead-out cable is usually divided into multiple thinner lead-out cables. As the number of lead-out cables increases, the number of required terminals is bound to increase accordingly.

[0003] In the prior art, when designing the outlet terminal box of the motor, the terminal installation structure is usually arranged flat inside (i.e., located on the same plane), and the terminal of the terminal block can often only be contacted on one side, which results in the terminal occupying a large space inside the terminal box, and the terminal box needs to be designed with a larger size, which will occupy too much installation space. In addition, in this flat terminal structure, the distance between adjacent terminals and between the terminal and the motor housing is very close. For high-power motors, the reserved space for creepage distance is insufficient, which is easy to cause leakage. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned prior art, the utility model discloses an output terminal box for a motor, which adopts a three-dimensional bridge-type terminal installation structure inside, which can reduce the occupation of the internal space of the terminal box by the terminal, is conducive to the miniaturization design of the terminal box size, and can also increase the creepage distance between the terminals and reduce the risk of leakage.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An outlet junction box, comprising:

[0007] Box body; the box body is a box structure with an open top, a stator lead-out line outlet is provided at the bottom of the box body, and a cable outlet is provided on the opposite side wall of the box body;

[0008] The box cover is installed at the top open end of the box body;

[0009] Wiring device; the wiring device is located in the inner cavity of the box body, and the wiring device includes a three-phase copper busbar and a copper busbar bracket for supporting the three-phase copper busbar. The three-phase copper busbar is divided into a U-phase copper busbar, a V-phase copper busbar and a W-phase copper busbar arranged in parallel, and a plurality of power connection bolts are provided on both sides of each phase copper busbar.

[0010] Furthermore, the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are arranged at the same plane height.

[0011] Furthermore, the V-phase copper bar is fixed to the middle of the copper bar bracket, and the U-phase copper bar and the W-phase copper bar are respectively fixed to the two ends of the copper bar bracket. Taking the bottom surface of the copper bar bracket as the reference plane, the U-phase copper bar and the W-phase copper bar are of the same height and are higher than the V-phase copper bar.

[0012] Furthermore, the inner wall of the box body is provided with a mounting column, and the copper busbar bracket is fixed on the mounting column.

[0013] Furthermore, the wiring device also includes a pressure strip and a pressure block. The pressure strip is located on the upper part of the copper busbar bracket. One end of the pressure strip and one end of the copper busbar bracket jointly clamp and fix the U-phase copper busbar, and the other end of the pressure strip and the other end of the copper busbar bracket jointly clamp and fix the W-phase copper busbar; the pressure block is located between the copper busbar bracket and the pressure strip, and the pressure block and the copper busbar bracket jointly clamp and fix the V-phase copper busbar.

[0014] Furthermore, the three-phase copper bar is a straight bar type, and the copper bar bracket, pressure bar and pressure block are arranged in the same number and at least two of each are arranged, at least one of the copper bar brackets, a pressure bar and a pressure block constitute a clamping mechanism for jointly clamping one end of the three-phase copper bar, and at least another copper bar bracket, another pressure bar and another pressure block constitute a clamping mechanism for jointly clamping the other end of the three-phase copper bar; the two ends of the three-phase copper bar respectively extend out of the outside of the clamping mechanism, and the extended end of the three-phase copper bar has a power connection bolt, which serves as the output end power connection bolt, and the power connection bolt between the two clamping mechanisms is used to connect the stator lead wire.

[0015] Furthermore, the length direction of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar when arranged is consistent with the connection direction of the two cable outlets on the box body.

[0016] Furthermore, the copper bar bracket is provided with a groove with an open top in the middle part, an embedding groove with an open top is provided on the bottom surface of the groove, fixing holes are respectively provided at both ends of the bottom surface of the groove, embedding grooves with an open top are respectively provided on the top surfaces of the copper bar brackets on both sides of the groove, and fixing holes are respectively provided on the top surfaces of both ends of the copper bar bracket; embedding grooves with an open bottom are respectively provided at both ends of the bottom surface of the pressure strip, recessed parts are respectively provided at both ends of the top surface of the pressure strip, and fixing holes are provided on the bottom surface of the recessed parts; an embedding groove with an open bottom is provided on the bottom surface of the pressing block, and fixing holes are respectively provided at both ends of the top surface of the pressing block;

[0017] The bottom of the U-phase copper bar and the W-phase copper bar are respectively embedded in the embedding grooves at both ends of the copper bar bracket, the tops of the U-phase copper bar and the W-phase copper bar are respectively embedded in the embedding grooves at both ends of the pressure strip, the bottom of the V-phase copper bar is embedded in the embedding groove in the middle of the copper bar bracket, the pressure block is located in the groove of the copper bar bracket, the top of the V-phase copper bar is embedded in the embedding groove at the bottom of the pressure block, and the pressure block and the pressure strip are respectively fixed to the copper bar bracket by fasteners.

[0018] Furthermore, a recessed limit groove is provided on the top surface on both sides of each embedded groove on the copper bar bracket, and through pin holes are provided on the U-phase copper bar, the V-phase copper bar and the W-phase copper bar. Pins are inserted into the pin holes of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar respectively, and the two ends of each pin are located in the limit groove corresponding to the copper bar bracket.

[0019] The utility model is designed for a junction box for three-phase motor outlets. The three-phase copper bar is connected to each terminal. Both sides of the three-phase copper bar can be connected to the terminal, which effectively reduces the number of terminal seats, thereby greatly reducing the occupation of the internal space of the junction box; the three-phase copper bar is divided into a U-phase copper bar, a V-phase copper bar, and a W-phase copper bar. All stator lead wires of the same phase are connected to the copper bar of the corresponding phase, which also greatly saves the internal space of the junction box. The utility model provides two distribution forms of three-phase copper bars for low-power motors and high-power motors. For low-power motors, the U / V / W-phase copper bars can be flat-laid; for high-power motors, the U-phase copper bar, the V-phase copper bar, and the W-phase copper bar are supported and fixed by copper bar brackets to form a three-dimensional bridge structure. Compared with the flat-laid structure of the prior art, it can not only reduce the occupation of the internal space of the junction box, but also increase the creepage distance between the terminals and reduce the occurrence of leakage; the wiring structure layout designed by the utility model is conducive to the centralized wiring of the outlets. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of the outlet terminal box installed on the top of the motor housing;

[0021] Figure 2 It is a schematic diagram of the internal structure of the outlet junction box;

[0022] Figure 3 It is a schematic diagram of the assembly structure of the wiring device;

[0023] Figure 4 It is a structural schematic diagram of the copper bar bracket;

[0024] Figure 5 It is a schematic diagram of the structure of the layering strip;

[0025] Figure 6 It is a schematic diagram of the structure of the briquette;

[0026] Figure 7 It is the structural diagram of the copper busbar;

[0027] Figure 8 This is a partial cross-sectional view of the terminal box installed on the top of the motor housing.

[0028] Description of Figure Numbers:

[0029] 1. Box body; 11. Cable outlet; 12. Mounting column; 13. Cable outlet;

[0030] 2. Box cover;

[0031] 3. Wiring device; 31. Copper busbar support; 32. Pressure strip; 33. Pressure block; 34A. U-phase copper busbar; 34B. V-phase copper busbar; 34C. W-phase copper busbar; 35A. U-phase output terminal connecting bolt; 35B. V-phase output terminal connecting bolt; 35C. W-phase output terminal connecting bolt; 36. Connecting bolt;

[0032] 311, base; 312, side support; 313, embedded groove; 314, groove; 315, groove bottom surface; 316, fixing hole; 317, limit groove;

[0033] 321, body; 322, embedding groove; 323, recessed portion;

[0034] 331, embedding groove; 332, fixing hole;

[0035] 341, strip-shaped body; 342, output end bolt hole; 343, power connection bolt hole; 344, pin hole;

[0036] 4. Terminal blocks;

[0037] 5A, U-phase stator lead wire; 5B, V-phase stator lead wire; 5C, W-phase stator lead wire. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] This embodiment designs a motor outlet wiring box for the outlet wiring structure of the three-phase motor, such as Figure 1 and Figure 2 As shown, it mainly includes a box body 1, a box cover 2 installed at the open end of the top of the box body 1, and a wiring device 3 located in the inner cavity of the box body 1. The box body 1 is a rectangular box structure with an open top. The box body 1 is arranged on the top of the motor housing, and the bottom of the box body 1 is connected to the motor housing as a whole. The stator lead-out wire outlet 13 is opened at the bottom of the box body 1 and the top of the motor housing 1. The three-phase lead-out wires of the stator extend into the box body 1 from the outlet 13 and are connected to the wiring device 3. A through cable outlet 11 is symmetrically opened on one set of opposite side walls of the box body 1, and mounting columns 12 are respectively provided on another set of opposite inner walls of the box body 1. The top surface of the mounting column 12 is provided with a fixing hole, and the wiring device 3 is fixed to the mounting column 12 by bolts.

[0040] Among them, the wiring device 3 is mainly composed of a three-phase copper bar connected to the three-phase stator lead-out wires respectively and a copper bar bracket for supporting the three-phase copper bar. The three-phase copper bar is divided into a U-phase copper bar, a V-phase copper bar and a W-phase copper bar, and a plurality of power connection bolts are arranged at intervals on both sides of each phase copper bar. For the junction box applied to low-power motors, the three-phase copper bar can still adopt a flat-laying structure arrangement (the accompanying drawings are omitted in this method), that is, the U-phase copper bar, the V-phase copper bar and the W-phase copper bar are arranged at the same plane height, so that the height of the junction box can be reduced. Since the working current of the motor is small, the creepage distance between the terminals can meet the design requirements. However, for high-power motors, due to the large working current of the motor, the flat-laying structure arrangement is likely to cause the problem of insufficient creepage distance between the terminals. Therefore, the utility model sets the height of the U-phase copper bar and the W-phase copper bar to be the same, and the height of the V-phase copper bar is lower than the two, which is conducive to increasing the creepage distance between the terminals. The accompanying drawings of this embodiment are all shown with the latter high-power motor solution as an example, and the non-flat-laying structure solution is described below.

[0041] like Figure 3 As shown, the wiring device 3 mainly includes three-phase copper bars respectively connected to the three-phase stator lead wires, a copper bar bracket 31 for supporting the three-phase copper bars, and a pressure bar 32 and a pressure block 33 for cooperating with the copper bar bracket 31 to clamp and fix the three-phase copper bars, wherein the three-phase copper bars are divided into U-phase copper bars 34A, V-phase copper bars 34B and W-phase copper bars 34C. Two copper bar brackets 31, pressure bars 32 and pressure blocks 33 are respectively provided, wherein one copper bar bracket 31, one pressure bar 32 and one pressure block 33 constitute a clamping mechanism for clamping one end of the three-phase copper bars together, and another copper bar bracket 31, another pressure bar 32 and another pressure block 33 constitute another clamping mechanism for clamping the other end of the three-phase copper bars together. The following is a detailed description of the structure of each component one by one in conjunction with the accompanying drawings.

[0042] like Figure 4 As shown, the main body of the copper bar support 31 is divided into a base 311 located in the middle and side supports 312 located at both ends. The top surfaces of the two side supports 312 are flush, and the bottoms of the two side supports 312 are suspended, and their bottom surfaces are higher than the bottom surface of the base 311. A concave open groove 314 is formed in the middle area of ​​the top surface of the base 311, and the top surface of the side support 312 is higher than the bottom surface 315 of the groove. A concave open embedding groove 313 is formed in the middle of the bottom surface 315 of the groove, and fixing holes 316 are respectively provided on the bottom surface 315 of the groove on both sides of the embedding groove 313, and concave limiting grooves 317 are symmetrically provided on the top surfaces on both sides of the embedding groove 313. A concave open embedding groove 313 is formed on the top surface of each side support 312, and concave limiting grooves 317 are symmetrically provided on the top surfaces of both sides of the embedding groove 313 of each side support 312, and a fixing hole 316 is provided on the edge side of the top surface close to the side support 312.

[0043] like Figure 5 As shown, the main body 321 of the pressure strip 32 is a straight strip, and downwardly open embedding grooves 322 are respectively provided on the bottom surface of the main body 321 near both ends, and recessed parts 323 are respectively provided at the edges of both ends of the top surface of the main body 321, and through fixing holes are provided on the bottom surface of the recessed parts 323.

[0044] like Figure 6 As shown, a convex portion is formed in the middle of the top surface of the pressing block 33, through fixing holes 332 are respectively provided on the top surfaces on both sides of the convex portion, and a downwardly open embedding groove 331 is provided in the middle of the bottom surface of the pressing block 33 corresponding to the position of the convex portion.

[0045] like Figure 7 As shown, the structures of the U-phase, V-phase and W-phase copper bars are the same, all of which are straight bar-shaped. The main body of the three-phase copper bar is a bar-shaped body 341, and through output terminal bolt holes 342 are respectively provided at both ends of the bar-shaped body 341. A plurality of through power connection bolt holes 343 are provided at intervals in the area between the two output terminal bolt holes 342 of the bar-shaped body 341, and a through pin hole 344 is provided between the output terminal bolt hole 342 at one end and the adjacent power connection bolt hole 343. The apertures of the output terminal bolt hole 342, the power connection bolt hole 343 and the pin hole 344 gradually decrease.

[0046] The copper bar bracket 31, the three-phase copper bar, the pressure strip 32 and the pressure block 33 are assembled together to form the power connection device 3. Figure 3As shown, two copper bar brackets 31 are arranged in parallel and at intervals, and the U-phase copper bar 34A, the V-phase copper bar 34B and the W-phase copper bar 34C are arranged perpendicular to the direction of the copper bar bracket 31, and the three copper bars are placed in parallel, and the bottoms of both ends of the U-phase copper bar 34A and the W-phase copper bar 34C are respectively embedded in the corresponding embedding grooves 313 on the side support 312 of the copper bar bracket 31, and the bottoms of both ends of the V-phase copper bar 34B are respectively embedded in the embedding grooves 313 on the base 311 of the copper bar bracket 31, and the two ends of each phase copper bar extend out between the two copper bar brackets 31, the output end bolt hole 342 is located on the outside of the copper bar bracket 31, the pin hole 344 is located at the limiting groove 317 of the side support 312, and the remaining power connection bolt hole 343 is between the two copper bar brackets 31. Pins are inserted into the pin holes 344 of the U-phase copper bar 34A, the V-phase copper bar 34B and the W-phase copper bar 34C respectively, so that the two ends of each pin are located in the limiting grooves 317 corresponding to the side supports 312 of the copper bar bracket 31, and the positions of the three-phase copper bars are limited by the pins. A pressing block 33 is arranged at the groove 314 of each copper bar bracket 31, so that the top of the V-phase copper bar 34B is embedded in the embedding groove 331 on the bottom surface of the pressing block 33, and the bottom surface of the pressing block 33 contacts the bottom surface 315 of the groove, and the pressing block 33 is fixed in the groove 314 with bolts. A pressure strip 32 is respectively arranged on the upper part of each copper bar support 31, so that the top of the U-phase copper bar 34A and the W-phase copper bar 34C are respectively embedded in the embedding groove 322 at the bottom of the pressure strip 32, and the U-phase output terminal power connection bolt 35A is installed on the output terminal bolt hole 342 of the U-phase copper bar 34A, the V-phase output terminal power connection bolt 35B is installed on the output terminal bolt hole 342 of the V-phase copper bar 34B, and the W-phase output terminal power connection bolt 35C is installed on the output terminal bolt hole 342 of the W-phase copper bar 34C. Power connection bolts 36 are installed on each power connection bolt hole 343 of each phase copper bar, so that power connection bolts 36 are distributed at intervals on both sides of each phase copper bar.

[0047] Finish Figure 3 After the wiring device 3 is assembled, the wiring device 3 is placed in the cavity of the box body 1, so that the length direction of the three-phase copper bar is consistent with the connection direction of the two cable outlets 11 on the box body 1, which is conducive to centralized outlet. The bottom of the side support 312 of each copper bar bracket 31 is placed on the top of the mounting column 12 on the inner wall of the box body 1, and bolts are passed through the fixing holes 323 of the pressure strip 32, the fixing holes 316 on the side support 312, and the fixing holes on the top of the mounting column 12 to fix the pressure strip 32, the copper bar bracket 31, and the mounting column 12 together.

[0048] The above-mentioned outlet terminal box designed by the utility model is connected with the stator lead wires. Figure 8As shown, the yellow lead wire is the U-phase stator lead wire 5A, the green lead wire is the V-phase stator lead wire 5B, and the red lead wire is the W-phase stator lead wire 5C. The connection end of each stator lead wire is provided with a terminal 4. The terminal 4 of each U-phase stator lead wire 5A is connected to the corresponding power connection bolt 36 on the U-phase copper bar 34A, the terminal 4 of each V-phase stator lead wire 5B is connected to the corresponding power connection bolt 36 on the V-phase copper bar 34B, and the terminal 4 of each W-phase stator lead wire 5C is connected to the corresponding power connection bolt 36 on the W-phase copper bar 34C. The stator lead wire connection is performed according to the junction box designed by the utility model, which can not only save the number of terminal blocks used, but also because the three-phase copper bar forms a bridge structure with the help of the copper bar bracket 31, the distance between the terminal blocks 4 between adjacent copper bars is enlarged, and sufficient creepage distance is reserved to avoid leakage.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An outlet junction box, characterized in that: include: Box body; the box body is a box structure with an open top, a stator lead-out line outlet is provided at the bottom of the box body, and a cable outlet is provided on the opposite side wall of the box body; A box cover; the box cover is mounted on the top open end of the box body; Wiring device; the wiring device is located in the inner cavity of the box body, and the wiring device includes a three-phase copper busbar and a copper busbar bracket for supporting the three-phase copper busbar. The three-phase copper busbar is divided into a U-phase copper busbar, a V-phase copper busbar and a W-phase copper busbar arranged in parallel, and a plurality of power connection bolts are provided on both sides of each phase copper busbar.

2. The outlet junction box according to claim 1, characterized in that: The U-phase copper bar, the V-phase copper bar and the W-phase copper bar are arranged at the same plane height.

3. The outlet junction box according to claim 1, characterized in that: The V-phase copper bar is fixed to the middle of the copper bar bracket, and the U-phase copper bar and the W-phase copper bar are respectively fixed to the two ends of the copper bar bracket. Taking the bottom surface of the copper bar bracket as the reference plane, the U-phase copper bar and the W-phase copper bar are of the same height and are higher than the V-phase copper bar.

4. The outlet junction box according to claim 1, characterized in that: The inner wall of the box body is provided with a mounting column, and the copper bar bracket is fixed on the mounting column.

5. The outlet junction box according to claim 3, characterized in that: The wiring device also includes a pressure strip and a pressure block. The pressure strip is located on the upper part of the copper bar bracket. One end of the pressure strip and one end of the copper bar bracket jointly clamp and fix the U-phase copper bar, and the other end of the pressure strip and the other end of the copper bar bracket jointly clamp and fix the W-phase copper bar; the pressure block is located between the copper bar bracket and the pressure strip, and the pressure block and the copper bar bracket jointly clamp and fix the V-phase copper bar.

6. The outlet junction box according to claim 5, characterized in that: The three-phase copper bar is a straight bar type, and the copper bar bracket, pressure bar and pressure block are arranged in the same number and at least two of each are arranged, at least one of the copper bar brackets, one pressure bar and one pressure block constitutes a clamping mechanism for jointly clamping one end of the three-phase copper bar, and at least another copper bar bracket, another pressure bar and another pressure block constitute a clamping mechanism for jointly clamping the other end of the three-phase copper bar; the two ends of the three-phase copper bar respectively extend out of the outside of the clamping mechanism, and the extended end of the three-phase copper bar has an electrical connection bolt, which serves as an output end electrical connection bolt, and the electrical connection bolt between the two clamping mechanisms is used to connect the stator lead wire.

7. The outlet junction box according to claim 6, characterized in that: The length direction of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar when arranged is consistent with the connection direction of the two cable outlets on the box body.

8. The outlet junction box according to claim 5, characterized in that: The copper bar bracket has a groove with an open top in the middle part, an embedding groove with an open top is provided on the bottom surface of the groove, and fixing holes are respectively provided at both ends of the bottom surface of the groove; embedding grooves with an open top are respectively provided on the top surfaces of the copper bar brackets on both sides of the groove, and fixing holes are respectively provided on the top surfaces of both ends of the copper bar bracket; embedding grooves open downward are respectively provided at both ends of the bottom surface of the pressure strip, and recessed parts are respectively provided at both ends of the top surface of the pressure strip, and fixing holes are provided on the bottom surface of the recessed parts; an embedding groove open downward is provided on the bottom surface of the pressing block, and fixing holes are respectively provided at both ends of the top surface of the pressing block; The bottom of the U-phase copper bar and the W-phase copper bar are respectively embedded in the embedding grooves at both ends of the copper bar bracket, the tops of the U-phase copper bar and the W-phase copper bar are respectively embedded in the embedding grooves at both ends of the pressure strip, the bottom of the V-phase copper bar is embedded in the embedding groove in the middle of the copper bar bracket, the pressure block is located in the groove of the copper bar bracket, the top of the V-phase copper bar is embedded in the embedding groove at the bottom of the pressure block, and the pressure block and the pressure strip are respectively fixed to the copper bar bracket by fasteners.

9. The outlet junction box according to claim 8, characterized in that: A recessed limiting groove is respectively provided on the top surface on both sides of each embedded groove on the copper bar bracket, and through pin holes are provided on the U-phase copper bar, the V-phase copper bar and the W-phase copper bar. Pins are respectively inserted into the pin holes of the U-phase copper bar, the V-phase copper bar and the W-phase copper bar, and both ends of each pin are located in the limiting groove corresponding to the copper bar bracket.

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