Cylindrical bus duct

Abstract

The invention discloses a cylindrical bus duct, and belongs to the technical field of cable installation. The bus duct comprises a bus duct shell and a connector shell, the bus duct shell and the connector shell are movably connected, the bus duct shell is of a square-outside and round-inside structure, the outer wall of the bus duct shell is provided with a plurality of sets of cooling fins, and the position, close to the edge, of the outer wall of the bus duct shell is provided with a fixing clamping groove. A first conductive assembly and an insulating fixing block are arranged in the bus duct shell; the first conductive assembly comprises a center N line and three electric conductors, the three electric conductors are each of an arc-shaped structure, and an insulating parting strip is arranged between every two adjacent electric conductors. The first conductive assembly in the bus duct shell has an independent installation space, the electric gap is large, the heat dissipation function is high, the mechanical strength is high, the whole structure is small in size, the current-carrying capacity is large, the heat dissipation of the conductor is good, and the power transmission capacity is greatly improved. And the arc-shaped conductor is not easy to deform during working, so that the stability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of cable installation, and more specifically to a cylindrical bus duct. Background Art

[0002] With the continuous development of modern industrial automation equipment, electrical equipment in all walks of life is also constantly increasing and improving. As a traditional way of transmitting electricity, the existing electrical equipment and safety requirements can no longer meet the actual requirements. When transmitting large currents, multiple cables are used in parallel for transmission, which is inconvenient for on-site installation and construction, and the volume is large after installation. Using dense bus duct as a power transmission equipment, the dense bus duct shell is composed of a combination of side panels and cover plates, which is not waterproof. The conductors are coated with insulating materials, tightly combined together, and assembled in the shell. If one of the conductors heats up, it will affect the heating of other conductors. The heating of the conductor directly affects the decrease of its current carrying capacity, thereby making the conductor hotter. Excessive heating of the conductor will affect the accelerated aging of the insulating material, and safety accidents will occur over time.

[0003] Another type of waterproof bus duct is cast with epoxy polyester. The finished product is bulky and inconvenient to install. The conductor of the epoxy polyester bus duct is solidified in the polyester. When a large current passes through it, the conductor will heat up and cannot dissipate heat in time, which affects the current carrying capacity of the conductor. The conductor material will expand after heating. According to the principle of thermal expansion and contraction, the epoxy polyester may crack over time, resulting in waterproofing and leakage. In order to meet the waterproof requirements, the connector of the epoxy polyester bus duct is also cast with epoxy polyester. If the bus bar is found to have expansion problems, it will take a long time to replace, which is very inconvenient.

[0004] In summary, the existing power transmission equipment has shortcomings in terms of large current transmission, waterproof performance, installation convenience and long-term stable operation. In view of this, we propose a cylindrical bus duct. Summary of the invention

[0005] The object of the present invention is to provide a cylindrical bus duct to solve the problems raised in the above background technology: To achieve the above object, the present invention provides the following technical solutions: A cylindrical bus duct, comprising a bus duct housing and a connector housing, the bus duct housing and the connector housing are movably connected, the bus duct housing adopts an outer square inner circle structure, the outer wall of the bus duct housing is provided with multiple groups of heat sinks, the outer wall of the bus duct housing is provided with a fixed card slot near the edge, and the bus duct housing is provided with a first conductive component and an insulating fixed block; The first conductive component includes a center N line and three conductors. The center N line coincides with the central axis of the bus duct shell. The three conductors are all arc-shaped structures. The three conductors are arranged in a ring shape with equal intervals on the inner wall of the bus duct shell. The insulating fixing block is located on the inner side of the conductor. An insulating spacer is arranged between two adjacent conductors, and an insulating layer is arranged on the surface of the conductor.

[0006] Preferably, the bus duct housing is made of aluminum-magnesium alloy; The insulation layer is composed of a thermally conductive silicone sheet and DuPont insulation paper. The thermally conductive silicone sheet is pasted on the inner wall of the bus duct shell, and the DuPont insulation paper is wrapped on the conductor. The insulating spacers are made of polyethylene high temperature resistant PTFE material.

[0007] Preferably, a second conductive component is disposed in the connector housing, the second conductive component has the same structure as the first conductive component, and the second conductive component can be connected to the first conductive component by fastening a nut block; The connector housing comprises an upper housing and a lower housing which cooperate with each other. Both sides of the upper housing and the lower housing are provided with connecting parts, the connecting parts are provided with grooves, a sealing strip is provided in the groove, and a plurality of connecting holes are also provided on the connecting parts.

[0008] Preferably, a connecting cylinder is provided at the end of the bus duct housing, a sealing groove is provided on the outer wall of the connecting cylinder, an O-ring is provided in the sealing groove, and the O-ring can be sealed and matched with the connector housing.

[0009] Preferably, an annular groove is provided at the end of the connecting tube, an annular slider is slidably connected in the annular groove, a spring is arranged in the annular groove, and the spring is connected to one end of the annular slider; A convex ring is connected to the outer side of the annular slider, and protrusions are arranged on the inner walls at both ends of the upper shell and the lower shell, and the outer diameter of the convex ring is greater than the inner diameter of the protrusion.

[0010] Preferably, a plurality of limit blocks are arranged near the outer end of the annular groove, a plurality of limit grooves are opened on the outer wall of the annular sliding block, and the limit blocks are slidably matched with the limit grooves.

[0011] Preferably, a limit screw is provided through the protrusion, and the limit screw is threadedly connected to the protrusion.

[0012] Preferably, it also includes a fixing nut assembly, which includes a screw rod, a fixing body is provided at the end of the screw rod, the fixing body is plugged into the fixing slot, an adjusting nut is threadedly connected to one end of the screw rod, a limiting plate is provided between two adjacent adjusting nuts, and both ends of the limiting plate are rotatably connected to a limiting ring, and the cross-section of the limiting ring is a T-shaped structure; The adjusting nut is connected with a limiting cylinder, and the limiting ring is sleeved on the limiting cylinder.

[0013] Preferably, heat dissipation holes are provided on the heat dissipation fins located in the middle and at the edges.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The first conductive component in the bus duct housing of the present invention has an independent installation space, a large electrical gap, a strong heat dissipation function, high mechanical strength, a small overall structure, a large current carrying capacity, and good heat dissipation of the conductor, which greatly improves the power transmission capacity. The arc-shaped conductor is not easy to deform during operation and has higher stability; the three conductors are separated by insulating spacers, so that the electrical gap between adjacent conductors is large, the creepage distance is larger, and the safe distance for electricity use is greatly increased.

[0015] (2) The present invention arranges an annular slider at one end of the connecting tube to cooperate with the annular groove. The annular slider can slide axially in the annular groove. A spring is arranged in the annular groove. The spring is connected to one end of the annular slider. The spring can provide a certain pulling force for the annular slider. A convex ring is connected to the outer side of the annular slider. The outer diameter of the convex ring is larger than the inner diameter of the convex ring. The arrangement of the convex ring limits the axial position of the bus duct shell and the connector shell when they are connected, thereby preventing the bus duct shell and the connector shell from being separated from each other under the influence of external force after being connected, thereby improving the installation stability of the bus duct shell and the connector shell.

[0016] (3) The present invention adopts the setting of the fixing nut assembly. When realizing the arrangement and fixed installation between multiple bus ducts, the multiple bus duct shells can be connected by the fixing nut assembly and then installed on the bracket. There is no need to connect and fix each bus duct shell to the bracket separately, thus saving installation steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the cylindrical bus duct of the present invention; Figure 2 It is a schematic diagram of the overall structure of the cylindrical bus duct of the present invention; Figure 3 It is a schematic cross-sectional view of the internal structure of the bus duct housing of the present invention; Figure 4 It is a schematic diagram of the installation state of the connecting tube and the lower shell of the present invention; Figure 5 It is a schematic diagram of the connecting tube structure of the present invention; Figure 6 It is a right view structural schematic diagram of the connecting tube of the present invention; Figure 7 It is a schematic diagram of the connection state of two adjacent bus duct housings of the present invention; Figure 8 It is a schematic diagram of the structure of the fixing nut assembly of the present invention.

[0018] Explanation of the reference numerals in the figure: 1. busbar housing; 101. connecting tube; 102. annular groove; 103. annular slider; 104. spring; 105. convex ring; 106. limit block; 107. limit groove; 108. limit screw; 2. heat sink; 201. heat dissipation hole; 3. fixing slot; 4. first conductive component; 401. center N line; 402. conductor; 5. insulating fixing block; 6. insulating spacer; 7. insulating layer; 8 , connector housing; 801, upper housing; 802, lower housing; 803, connecting portion; 804, connecting hole; 805, protrusion; 9, second conductive component; 10, fastening nut block; 11, sealing strip; 12, O-ring; 13, fastening bolt; 14, locking screw; 15, fixing nut assembly; 16, screw; 17, fixing body; 18, adjusting nut; 19, limiting plate; 20, limiting ring; 21, limiting cylinder. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment 1: See also Figure 1-6 A cylindrical bus duct comprises a bus duct shell 1 and a connector shell 8, the bus duct shell 1 and the connector shell 8 are movably connected, the bus duct shell 1 adopts an outer square and inner circle structure, and the bus duct shell 1 is made of aluminum-magnesium alloy and is formed by one-time stretching; the outer wall of the bus duct shell 1 is provided with multiple groups of heat sinks 2, and the bus duct shell 1 adopts a structural design of an outer square and inner circle with heat sinks 2, which effectively increases the heat dissipation area of ​​a first conductive component 4; a fixed card slot 3 is provided near the edge of the outer wall of the bus duct shell 1, and the fixed card slot 3 is used for installing the bus duct, and a first conductive component 4 and an insulating fixing block 5 are provided in the bus duct shell 1, and the insulating fixing block 5 is used to fix the position of the first conductive component 4; wherein, the first conductive component 4 in the bus duct shell 1 has an independent installation space, a large electrical gap, a strong heat dissipation function, high mechanical strength, a small overall structure volume, a large current carrying capacity, good heat dissipation of the conductor, and greatly improves the power transmission capacity.

[0021] The outer side of the bus duct housing 1 is square, with a fixed slot 3 on the upper side. The fixed slot 3 can be equipped with a fixing nut. The bus duct housing 1 can be directly fixed on the bracket with a nut, which makes it more convenient to install the busbar in any working condition. The shell is stretched and formed in one time, and can be used in any environment as long as it is anti-corrosive treated.

[0022] In the present application, heat dissipation holes 201 are provided on the heat dissipation fins 2 located in the middle and at the edges. The arrangement of the heat dissipation holes 201 enables air to flow through the heat dissipation holes 201, thereby improving heat dissipation efficiency.

[0023] Specific as Figure 3 As shown, the first conductive component 4 includes a center N line 401 and three conductors 402, and the three conductors 402 are respectively an A-phase conductor, a B-phase conductor, and a C-phase conductor; the center N line 401 coincides with the central axis of the bus duct shell 1, and the center N line 401 is installed and fixed with an insulating fixing block 5. At the same time, the insulating fixing block 5 also supports the A-phase conductor, the B-phase conductor, and the C-phase conductor to ensure that the conductor 4 and the shell 1 are more tightened and stable.

[0024] The three conductors 402 are all arc-shaped structures, which can better fit closely with the bus duct housing 1, so that the heat generated by the current passing through the bus can be dissipated in time through the bus duct housing 1, thereby increasing the current carrying capacity of the bus. The arc-shaped conductor 402 is not easy to deform during operation, and its stability is higher. Among them, the three conductors 402 are installed independently, and the three conductors 402 are arranged in a ring shape with equal spacing on the inner wall of the bus duct housing 1. The insulating fixing block 5 is located on the inner side of the conductor 402. An insulating spacer 6 is arranged between two adjacent conductors 402. The insulating spacer 6 is made of polyethylene high-temperature resistant tetrafluoroethylene material. The three conductors 402 are separated by the insulating spacer 6, so that the electrical gap between adjacent conductors 402 is large, the creepage distance is larger, and the safe distance for electricity use is greatly increased. An insulating layer 7 is arranged on the surface of the conductor 402, and the conductor 402 is tightly combined with the bus duct housing 1 through the insulating layer 7.

[0025] In the present application, the insulating layer 7 is composed of a thermally conductive silicone sheet and DuPont insulating paper, the thermally conductive silicone sheet is adhered to the inner wall of the busbar housing 1, and the DuPont insulating paper is wrapped on the conductor 402; the center is reinforced with multiple insulating fixing blocks 5 to prevent the first conductive component 4 from loosening easily in the housing. The center N line 401 conductor is installed in the middle of the fixing block.

[0026] In the present application, a second conductive component 9 is provided in the connector housing 8, and the second conductive component 9 has the same structure as the first conductive component 4. The installation method of the second conductive component 9 in the connector housing 8 is also the same as the installation and fixing method of the first conductive component 4 in the bus duct housing 1. The second conductive component 9 can be connected to the first conductive component 4 through a fastening nut block 10. Fastening nut blocks 10 are provided at both ends of the second conductive component 9, and the fastening nut blocks 10 are integrated with the conductor, which is convenient for installation, and the nut will not fall off, and the installation is more reliable and safe.

[0027] like Figure 2As shown, the connector housing 8 includes an upper housing 801 and a lower housing 802 that cooperate with each other. The upper housing 801 and the lower housing 802 are detachably connected and can be replaced quickly and conveniently. Connecting parts 803 are provided on both sides of the upper housing 801 and the lower housing 802. A groove is provided on the connecting part 803, and a sealing strip 11 is provided in the groove. The setting of the sealing strip 11 ensures the sealing when the upper housing 801 and the lower housing 802 are connected. A plurality of connecting holes 804 are also provided on the connecting part 803, and a through hole corresponding to the connecting hole 804 is also provided on the sealing strip 11 to facilitate the passage of the locking screw 14.

[0028] like Figure 4 As shown, in the present application, a connection tube 101 is provided at the end of the bus duct housing 1, a sealing groove is provided on the outer wall of the connection tube 101, an O-ring 12 is provided in the sealing groove, and the O-ring 12 can be sealed with the connector housing 8, and the sealing of the bus duct housing 1 and the connector housing 8 during connection and installation is achieved by the setting of the O-ring 12. The O-ring 12 and the sealing strip 11 are both formed of silicone and are precisely processed to closely match the bus duct and the connector housing 8, so that it can be ensured to be waterproof, explosion-proof, and safer after installation.

[0029] like Figure 5 , 6 As shown, in the present application, an annular groove 102 is provided at the end of the connecting tube 101, and an annular slider 103 is slidably connected in the annular groove 102. The annular slider 103 can slide axially in the annular groove 102. A spring 104 is provided in the annular groove 102. The spring 104 is connected to one end of the annular slider 103. The spring 104 can provide a certain pulling force for the annular slider 103.

[0030] A convex ring 105 is connected to the outer side of the annular slider 103. A protrusion 805 is provided on the inner wall of both ends of the upper shell 801 and the lower shell 802. The outer diameter of the convex ring 105 is larger than the inner diameter of the protrusion 805. The setting of the convex ring 105 limits the axial position of the bus duct housing 1 and the connector housing 8 when they are connected. Figure 4 As shown in FIG. 1 , the protruding ring 105 is tightly fitted to the protrusion 805 by the tension of the spring 104 .

[0031] In the present application, a plurality of limit blocks 106 are provided near the outer end of the annular groove 102, and a plurality of limit grooves 107 are provided on the outer wall of the annular slider 103. The limit blocks 106 are slidably matched with the limit grooves 107. The cooperation between the limit grooves 107 and the limit blocks 106 prevents the annular slider 103 from sliding out of the annular groove 102, thereby limiting the maximum displacement of the annular slider 103.

[0032] In a possible embodiment, a limiting screw 108 is provided through the protrusion 805, and the limiting screw 108 is threadedly connected to the protrusion 805. By rotating the limiting screw 108 so that the end of the limiting screw 108 abuts against the protrusion 805, the axial position of the bus duct housing 1 and the connector housing 8 when connected is further limited, thereby preventing the bus duct housing 1 and the connector housing 8 from detaching from each other and improving the installation stability.

[0033] Embodiment 2: See also Figure 7 , 8 , combined with the basis of embodiment 1, the difference is that: it also includes a fixing nut assembly 15, and the fixing nut assembly 15 is used to realize the arrangement and fixed installation between multiple bus ducts. The fixing nut assembly 15 includes a screw rod 16, and a fixing body 17 is arranged at the end of the screw rod 16. The fixing body 17 is plugged and matched with the fixing card slot 3, and the fixing body 17 can slide along the fixing card slot 3. An adjusting nut 18 is threadedly connected to one end of the screw rod 16, and a limiting plate 19 is arranged between two adjacent adjusting nuts 18. The two ends of the limiting plate 19 are rotatably connected to the limiting ring 20, and the cross-section of the limiting ring 20 is a T-shaped structure; a limiting cylinder 21 is connected to the adjusting nut 18, wherein the limiting cylinder 21 is connected to the limiting cylinder 21. The cylinder 21 can be threadedly matched with the screw 16, and the limiting cylinder 21 can also be gap-matched with the screw 16. The limiting ring 20 is sleeved on the limiting cylinder 21. The distance between the two nuts 18 is limited and fixed by the setting of the limiting ring 20. The nuts 18 can rotate independently. By rotating the nut 18, the end of the limiting cylinder 21 is squeezed on the outer wall of the fixed slot 3 to achieve the connection and fixation between the two adjacent bus duct shells 1. Finally, multiple connected bus duct shells 1 can be fixed on the bracket. There is no need to connect and fix each bus duct shell 1 to the bracket separately. Only a group of bus duct shells 1 on the edge need to be connected to the bracket, which saves installation steps.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cylindrical bus duct, comprising a bus duct housing (1) and a connector housing (8), wherein the bus duct housing (1) and the connector housing (8) are movably connected, and characterized in that: The bus duct housing (1) adopts an outer square and inner round structure, the outer wall of the bus duct housing (1) is provided with a plurality of groups of heat sinks (2), a fixing slot (3) is provided near the edge of the outer wall of the bus duct housing (1), and a first conductive component (4) and an insulating fixing block (5) are provided inside the bus duct housing (1); The first conductive component (4) comprises a central N line (401) and three conductors (402), the central N line (401) coincides with the central axis of the bus duct housing (1), the three conductors (402) are all arc-shaped structures, the three conductors (402) are arranged in a ring shape at equal intervals on the inner wall of the bus duct housing (1), the insulating fixing block (5) is located on the inner side of the conductor (402), an insulating spacer (6) is arranged between two adjacent conductors (402), and an insulating layer (7) is arranged on the surface of the conductor (402).

2. The cylindrical bus duct according to claim 1, characterized in that: The bus duct housing (1) is made of aluminum-magnesium alloy; The insulating layer (7) is composed of a thermally conductive silicone sheet and DuPont insulating paper, the thermally conductive silicone sheet is adhered to the inner wall of the bus duct housing (1), and the DuPont insulating paper is coated on the conductor (402); The insulating spacer (6) is made of polyethylene high temperature resistant polytetrafluoroethylene material.

3. The cylindrical bus duct according to claim 1, characterized in that: A second conductive component (9) is arranged in the connector housing (8); the second conductive component (9) has the same structure as the first conductive component (4); the second conductive component (9) can be connected to the first conductive component (4) by means of a fastening nut block (10); The connector housing (8) comprises an upper housing (801) and a lower housing (802) that fit together. Both sides of the upper housing (801) and the lower housing (802) are provided with connecting parts (803). A groove is provided on the connecting part (803). A sealing strip (11) is provided in the groove. The connecting part (803) is also provided with a plurality of connecting holes (804).

4. The cylindrical bus duct according to claim 3, characterized in that: A connecting tube (101) is provided at the end of the busbar duct housing (1), a sealing groove is provided on the outer wall of the connecting tube (101), an O-type sealing ring (12) is provided in the sealing groove, and the O-type sealing ring (12) can be sealed and matched with the connector housing (8).

5. The cylindrical bus duct according to claim 4, characterized in that: An annular groove (102) is formed at the end of the connecting tube (101), an annular slider (103) is slidably connected in the annular groove (102), a spring (104) is arranged in the annular groove (102), and the spring (104) is connected to one end of the annular slider (103); A convex ring (105) is connected to the outside of the annular slider (103), and protrusions (805) are provided on the inner walls at both ends of the upper shell (801) and the lower shell (802), and the outer diameter of the convex ring (105) is greater than the inner diameter of the protrusion (805).

6. The cylindrical bus duct according to claim 5, characterized in that: A plurality of limit blocks (106) are arranged near the outer end of the annular groove (102), a plurality of limit grooves (107) are opened on the outer wall of the annular sliding block (103), and the limit blocks (106) are slidably matched with the limit grooves (107).

7. The cylindrical bus duct according to claim 5, characterized in that: A limit screw (108) is provided through the protrusion (805), and the limit screw (108) is threadedly connected to the protrusion (805).

8. The cylindrical bus duct according to claim 1, characterized in that: The invention also comprises a fixing nut assembly (15), wherein the fixing nut assembly (15) comprises a screw rod (16), a fixing body (17) is arranged at the end of the screw rod (16), the fixing body (17) is plugged into and matched with the fixing slot (3), one end of the screw rod (16) is threadedly connected to an adjusting nut (18), a limiting plate (19) is arranged between two adjacent adjusting nuts (18), and both ends of the limiting plate (19) are rotatably connected to a limiting ring (20), and the cross-section of the limiting ring (20) is a T-shaped structure; The adjusting nut (18) is connected to a limiting cylinder (21), and the limiting ring (20) is sleeved on the limiting cylinder (21).

9. The cylindrical bus duct according to claim 1, characterized in that: Heat dissipation holes (201) are provided on the heat dissipation fins (2) located in the middle and at the edges.

Images