Junction box

Abstract

The utility model belongs to the technical field of connectors, and particularly relates to a junction box which comprises a shell, a fastening bolt, an aluminum bar and a copper column, the fastening bolt, the aluminum bar and the copper column are arranged in the shell, the copper column comprises a first column body and a second column body which are connected, and the cross section area of the first column body is smaller than that of the second column body; a first hole coaxial with the first column body is formed in the first column body, a second hole coaxial with the first hole is formed in the second column body, and the fastening bolt penetrates through the first hole and penetrates out of the second hole; a first through hole and a second through hole are sequentially formed in the aluminum bar in the thickness direction of the aluminum bar, and the first through hole is communicated with the second through hole; the first column body penetrates through the first through hole, the second column body penetrates through the second through hole, and the first column body and the second column body are fixedly connected with the aluminum row. According to the utility model, the fastening bolt penetrates through the copper column and then is in threaded connection with the copper bar of the connector, so that the resistance is relatively stable after long-term use.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power equipment, and in particular relates to a junction box. Background Art

[0002] When charging new energy vehicles, the junction box is generally connected to the connector. The current junction box has an aluminum busbar built in, and a rectangular copper sheet is welded to the surface of the aluminum busbar. Through holes are provided on the copper sheet and the aluminum busbar, respectively. Threaded holes are provided on the copper busbar in the connector. The copper busbar in the connector contacts the copper sheet in the junction box, and then bolts are passed through the aluminum busbar, copper sheet, and copper busbar, and then threadedly connected with nuts. The bolts and nuts press the copper busbar of the connector and the aluminum busbar of the junction box tightly.

[0003] However, aluminum busbars have poor shock resistance and will inevitably vibrate during long-term use. Bolts and nuts are prone to loosening after vibration, resulting in a decrease in the tightening force of the bolts and nuts, which increases the resistance at the connection between the junction box and the connector. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to provide a junction box in view of the problem that the aluminum bar in the existing junction box has poor seismic resistance, easily reduces the pressing force between the bolts and nuts, and causes the resistance at the connection between the junction box and the connector to increase.

[0005] To solve the above technical problems, an embodiment of the present utility model provides a junction box, comprising a housing, fastening bolts, an aluminum bar, and a copper column, wherein the fastening bolts, the aluminum bar, and the copper column are built into the housing, and the copper column comprises a first column and a second column connected to each other, wherein the cross-sectional area of ​​the first column is smaller than the cross-sectional area of ​​the second column;

[0006] The first column is provided with a first hole coaxial therewith, and the second column is provided with a second hole coaxial with the first hole. The fastening bolt is passed through the first hole and passes through the second hole. The end of the fastening bolt passing through the second hole is used for threaded connection with the copper busbar of the connector;

[0007] The aluminum bar is provided with a first through hole and a second through hole in sequence along the thickness direction thereof, the first through hole and the second through hole are connected, an end of the first through hole away from the second through hole extends to one side surface of the aluminum bar, and an end of the second through hole away from the first through hole extends to the other side surface of the aluminum bar;

[0008] The first column is passed through the first through hole, the second column is passed through the second through hole, and the first column and the second column are fixedly connected to the aluminum bar respectively.

[0009] Optionally, the first column is a cylinder, the first through hole is a round hole, and the first column is embedded in the first through hole; the second column is a square column, the second through hole is a square hole, and the second column is embedded in the second through hole.

[0010] Optionally, the shell includes a box body, a box cover and a tail cover, the shell has a first inner cavity and a second inner cavity, the first inner cavity has a first opening and a second opening arranged on opposite sides of the shell, the first opening is used for connector plugging, and the box cover closes the second opening; the second inner cavity has a third opening and a fourth opening, the first inner cavity and the second inner cavity are connected through the third opening, the tail cover is arranged in the fourth opening, the aluminum busbar is passed through the tail cover and inserted into the first inner cavity, and the second column is opposite to the first opening.

[0011] Optionally, it also includes a front rubber core, which is built into the first inner cavity, and the aluminum row is inserted into the front rubber core. The front rubber core is provided with a coaxial first jack and a second jack, the first jack is opposite to the first opening, the second jack is opposite to the second opening, the first column is opposite to the first jack, and the fastening bolt is passed through the second jack.

[0012] Optionally, it further includes a rear rubber core, which is arranged in the second inner cavity, the rear rubber core and the front rubber core are snap-connected, and the aluminum bar is passed through the rear rubber core.

[0013] Optionally, a tail sealing ring is further included, which surrounds the aluminum row and is arranged in the second inner cavity, and the side wall of the tail sealing ring abuts against the inner wall of the second inner cavity.

[0014] Optionally, the tail sealing ring includes a sealing block and multiple annular protrusions, the sealing block is provided with a through hole, the aluminum bar is passed through the through hole, the multiple annular protrusions are arranged along the depth direction of the through hole, and the multiple annular protrusions are arranged around the side wall of the sealing block.

[0015] Optionally, the first column and the second column are integrally formed.

[0016] Optionally, a sealing groove is provided on the box body around the first opening, a board end sealing ring is provided in the sealing groove, the board end sealing ring protrudes from the sealing groove, and the board end sealing ring is used to seal the shell and the connector.

[0017] Optionally, a cover sealing ring is provided between the box cover and the box body and surrounds the box cover, and the cover sealing ring is used to seal the box cover and the box body.

[0018] According to the junction box of the embodiment of the present invention, the copper column and the aluminum busbar are fixed by welding. When connecting with the copper busbar of the connector, the copper busbar and the copper column are abutted, and then a fastening bolt is used to pass through the copper column and threadedly connected to the copper busbar. Since the copper column and the copper busbar are made of the same material, the conductivity of the two is the same, and the copper material is harder than the aluminum material and has a stronger shock resistance. Even if vibration occurs after long-term use, the copper busbar and the copper column are not easy to loosen, and the connection effect of the bolt is stronger than the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall appearance of a junction box provided in one embodiment of the present utility model;

[0020] Figure 2 A schematic front view of a first opening of a junction box provided in one embodiment of the present utility model;

[0021] Figure 3 A half-section schematic diagram of a junction box provided in one embodiment of the present utility model;

[0022] Figure 4 This is an exploded schematic diagram of a junction box provided in one embodiment of the present invention.

[0023] The figures in the specification are as follows: 1. Shell; 11. First inner cavity; 12. Second inner cavity; 13. First opening; 14. Second opening; 15. Third opening; 16. Fourth opening; 17. Box body; 18. Box cover; 19. Tail cover; 2. Aluminum busbar; 21. First through hole; 22. Second through hole; 3. Copper column; 31. First column; 32. Second column; 33. First hole; 34. Second hole; 4. Fastening bolt; 5. Tail sealing ring; 51. Sealing block; 52. Ring bulge; 6. Cover sealing ring; 7. Plate end sealing ring; 8. Front rubber core; 9. Rear rubber core. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] like Figures 1 to 4As shown, one embodiment of the present invention provides a junction box, comprising a housing 1, fastening bolts 4, an aluminum busbar 2, and copper pillars 3. The fastening bolts 4, aluminum busbar 2, and copper pillars 3 are built into the housing 1. The copper pillars 3 include a first column 31 and a second column 32. One end face of the first column 31 is fixed to one end face of the second column 32. The cross-sectional area of ​​the first column 31 is smaller than the cross-sectional area of ​​the second column 32. In this embodiment, in the orthographic projection of the first column 31 and the second column 32 onto the same side surface of the aluminum busbar 2, the outer edge of the cross-sectional area of ​​the first column 31 is located inside the outer edge of the cross-sectional area of ​​the second column 32.

[0026] Reference Figure 3 The first column 31 is provided with a first hole 33 coaxial therewith, and the second column 32 is provided with a second hole 34 coaxial with the first hole 33. The fastening bolt 4 can pass through the first hole 33 and the second hole 34 in sequence. In this embodiment, the first column 31 and the second column 32 are integrally formed, and the first hole 33 and the second hole 34 are both circular holes.

[0027] A first through-hole 21 and a second through-hole 22 are sequentially provided along the thickness of the aluminum bar 2. A first column 31 is inserted through the first through-hole 21, and a second column 32 is inserted through the second through-hole 22. The first column 31 and the second column 32 are each fixedly connected to the aluminum bar 2. The end of the first through-hole 21, away from the second through-hole, extends to one side of the aluminum bar, while the end of the second through-hole 22, away from the first through-hole, extends to the other side of the aluminum bar. In other words, the first and second through-holes form a unit that extends through the aluminum bar.

[0028] In this embodiment, the copper column 3 and the aluminum busbar 2 are fixed by welding. When connecting to the copper busbar of the connector, the copper busbar and the copper column 3 are abutted, and then the fastening bolts 4 are passed through the copper column 3 and threadedly connected to the threaded holes on the copper busbar. The fastening bolts and the copper busbar press the copper busbar itself and the copper column, or the fastening bolts 4 are passed through the copper column 3 and the copper busbar, and the fastening bolts 4 are threadedly connected to the nuts, so that the fastening bolts and the nuts press the copper column and the copper busbar. Since the copper column 3 and the copper busbar are made of the same material, the conductivity of the two is the same, and the copper material is harder than the aluminum material and has stronger shock resistance. Even if vibration occurs after long-term use, the copper busbar and the copper column 3 are not easy to loosen, and the connection effect of the bolts is stronger than the existing technology.

[0029] Moreover, in this embodiment, the copper pillars 3 are embedded in the aluminum busbar 2 and welded, and the copper pillars 3 do not protrude from the aluminum busbar 2, so that the copper pillars 3 do not occupy additional volume.

[0030] Moreover, compared with some common junction boxes, which use a large amount of large-diameter copper wires or copper busbars, resulting in higher connection costs, the present embodiment uses aluminum busbars 2 instead of copper busbars to reduce costs.

[0031] Reference Figure 4As an example, the first cylinder 31 is a cylinder, the first through-hole 21 is a circular hole, and the diameter of the first through-hole 21 is equal to the diameter of the first cylinder 31. In other words, the first through-hole can accommodate the first cylinder. The second cylinder 32 is a square cylinder, the second through-hole 22 is a square hole, and the cross-section of the second through-hole 22 is the same as the cross-section of the second cylinder 32. In other words, the second through-hole can accommodate the second cylinder. In this embodiment, the first cylinder 31 can be accommodated in the first through-hole 21, and the second cylinder can be accommodated in the second through-hole 22. The surface of the second cylinder 32 away from the first cylinder 31 is coplanar with one side surface of the aluminum bar 2, and the surface of the first cylinder 31 away from the second cylinder 32 is coplanar with the other side surface of the aluminum bar 2. The fastening bolt 4 passes through the first cylinder 31, enters the first through-hole 21, and exits from the second through-hole 22.

[0032] Reference Figure 3 and Figure 4 As an example, the shell 1 includes a box body 17, a box cover 18 and a tail cover 19. The shell 1 has a first inner cavity 11 and a second inner cavity 12. The first inner cavity 11 has a first opening 13 and a second opening 14 arranged on opposite sides of the shell. The first opening 13 is used for connector plugging, and the box cover 18 closes the second opening 14; the second inner cavity 12 has a third opening 15 and a fourth opening 16. The first inner cavity 11 and the second inner cavity 12 are connected through the third opening 15. The tail cover 19 is arranged in the fourth opening 16. The aluminum bus 2 is passed through the tail cover 19 and inserted into the first inner cavity 11. The second column 32 is opposite to the first opening 13.

[0033] In this embodiment, the second cavity is disposed below the first cavity, with the first opening 13 and the second opening 14 facing each other. The first opening 13 and the second opening 14 are arranged along a first straight line. The third opening 15 and the fourth opening 16 face each other. The third opening 15 and the fourth opening 16 are arranged along a second straight line, wherein the first and second straight lines are perpendicular. The central axis of the first through hole 21 is perpendicular to the length direction of the aluminum bar 2, which is the direction in which the aluminum bar 2 penetrates the housing 1.

[0034] In this embodiment, the tail cover 19 and the box body 17 are connected by a snap fit, and the box cover 18 and the box body 17 are connected by bolts. The tail cover 19 has a one-way opening structure, and a plurality of snap fits are provided on the side wall of the tail cover 19. A plurality of snap protrusions are provided on the box body 17, and the snap protrusions and the snap fits are snap fit.

[0035] As an example, the junction box also includes a front rubber core 8, which is built into the first inner cavity 11, and the aluminum bus 2 is inserted into the front rubber core 8. The front rubber core 8 is provided with a coaxial first jack and a second jack, the first jack is opposite to the first opening 13, the second jack is opposite to the second opening 14, the first column 31 is opposite to the first jack, and the fastening bolt 4 is passed through the second jack.

[0036] As an example, the junction box further includes a rear rubber core 9 , which is disposed in the second inner cavity 12 . The rear rubber core 9 is snap-connected to the front rubber core 8 , and the aluminum busbar 2 is passed through the rear rubber core 9 .

[0037] As an example, the junction box further includes a tail sealing ring 5 , which surrounds the aluminum bar 2 and is disposed in the second inner cavity 12 , with a side wall of the tail sealing ring 5 abutting against an inner wall of the second inner cavity 12 .

[0038] As an example, the tail seal 5 includes a sealing block 51 and multiple annular protrusions 52. The sealing block 51 has a through-hole formed therein, and the aluminum bar 2 is provided with the through-hole. The multiple annular protrusions 52 are arranged along the depth direction of the through-hole and surround the sidewall of the sealing block 51. In other words, the sidewall of the tail seal 5 in this embodiment is wavy.

[0039] As an example, a sealing groove is provided on the box body 17 , which surrounds the first opening 13 and is provided at the periphery of the first opening 13 . A plate end sealing ring 7 is provided in the sealing groove and protrudes from the sealing groove.

[0040] As an example, a cover sealing ring 6 is provided between the box cover 18 and the box body 17, and the cover sealing ring 6 is provided around the box cover 18. Specifically, like the plate end sealing ring 7, a groove is provided on the box body 17 or the box cover 18, and the groove is provided around the box cover 18. The cover sealing ring 6 is built into the groove and protrudes from the groove, so that the cover sealing ring 6 can be deformed to seal the box cover 18 and the box body 17.

[0041] In other embodiments, the first column 31 and the second column 32 are both made of copper and are connected by welding. The first column 31 can be welded to the aluminum bus 2 first, and then the second column 32 can be welded.

[0042] In other embodiments, the first column 31 and the second column 32 are both cylinders, and the first through hole 21 and the second through hole 22 are both circular holes.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements 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 junction box, characterized in that: It includes a housing, fastening bolts, an aluminum bar and a copper column, wherein the fastening bolts, the aluminum bar and the copper column are built into the housing, and the copper column includes a first column and a second column connected to each other, wherein the cross-sectional area of ​​the first column is smaller than the cross-sectional area of ​​the second column; The first column is provided with a first hole coaxial therewith, and the second column is provided with a second hole coaxial with the first hole. The fastening bolt is passed through the first hole and passes through the second hole. The end of the fastening bolt passing through the second hole is used for threaded connection with the copper busbar of the connector; The aluminum bar is provided with a first through hole and a second through hole in sequence along the thickness direction thereof, the first through hole and the second through hole are connected, an end of the first through hole away from the second through hole extends to one side surface of the aluminum bar, and an end of the second through hole away from the first through hole extends to the other side surface of the aluminum bar; The first column is passed through the first through hole, the second column is passed through the second through hole, and the first column and the second column are fixedly connected to the aluminum bar respectively.

2. The junction box according to claim 1, wherein: The first column is a cylinder, the first through hole is a round hole, and the first column is embedded in the first through hole; the second column is a square column, the second through hole is a square hole, and the second column is embedded in the second through hole.

3. The junction box according to claim 1, wherein: The shell includes a box body, a box cover and a tail cover. The shell has a first inner cavity and a second inner cavity. The first inner cavity has a first opening and a second opening arranged on opposite sides of the shell. The first opening is used for connector insertion, and the box cover closes the second opening; the second inner cavity has a third opening and a fourth opening. The first inner cavity and the second inner cavity are connected through the third opening. The tail cover is arranged in the fourth opening. The aluminum busbar is passed through the tail cover and inserted into the first inner cavity, and the second column is opposite to the first opening.

4. The junction box according to claim 3, characterized in that: It also includes a front rubber core, which is built into the first inner cavity, and the aluminum row is inserted into the front rubber core. The front rubber core is provided with a coaxial first jack and a second jack, the first jack is opposite to the first opening, the second jack is opposite to the second opening, the first column is opposite to the first jack, and the fastening bolt is passed through the second jack.

5. The junction box according to claim 4, characterized in that: It also includes a rear rubber core, which is arranged in the second inner cavity. The rear rubber core and the front rubber core are snap-connected, and the aluminum bar is passed through the rear rubber core.

6. The junction box according to claim 3, characterized in that: It also includes a tail sealing ring, which surrounds the aluminum row and is arranged in the second inner cavity, and the side wall of the tail sealing ring abuts against the inner wall of the second inner cavity.

7. The junction box according to claim 6, characterized in that: The tail sealing ring includes a sealing block and multiple annular protrusions. A through hole is provided in the sealing block, and the aluminum bar passes through the through hole. The multiple annular protrusions are arranged along the depth direction of the through hole and are arranged around the side wall of the sealing block.

8. The junction box according to claim 1, wherein: The first column and the second column are integrally formed.

9. The junction box according to claim 3, characterized in that: A sealing groove is provided on the box body around the first opening, a board end sealing ring is provided in the sealing groove, the board end sealing ring protrudes from the sealing groove, and the board end sealing ring is used to seal the shell and the connector.

10. The junction box according to claim 3, characterized in that: A cover sealing ring is provided between the box cover and the box body and surrounds the box cover. The cover sealing ring is used to seal the box cover and the box body.

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