Fire-resistant bus duct and installation method thereof

Abstract

The invention relates to the technical field of power transmission equipment, and provides a fireproof bus duct which comprises a plurality of bus duct units, conducting bars at the close ends of the adjacent bus duct units are connected through bus connectors, and fireproof sleeves are further arranged at the close ends of the adjacent bus duct units. The two ends of the fireproof sleeve are connected to the end portions of the close ends of the adjacent bus duct units in a sleeving mode respectively, the bus connectors are located in the fireproof sleeve, the two opposite sides of the fireproof sleeve are each provided with a heat dissipation part, and each heat dissipation part comprises a plurality of heat dissipation holes formed in the fireproof sleeve; the periphery of the fireproof sleeve is wrapped with a fireproof expansion coating layer, and the fireproof expansion coating layer is provided with through holes corresponding to the heat dissipation holes. The fireproof bus duct has the effect of improving the fireproof performance of the joint of the fireproof bus duct.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission equipment, and in particular to a fire-resistant bus duct and an installation method thereof. Background Art

[0002] Fire-resistant bus ducts have good fire-proof performance and can maintain normal power transmission for a long time in high-temperature environments such as fires. They are widely used in power transmission for fire-fighting equipment inside large buildings such as factories and shopping malls.

[0003] At present, fire-resistant bus ducts usually adopt a spliced ​​structure, and the main body is composed of several bus duct units spliced ​​together; the conductive bars at the adjacent ends of adjacent bus duct units are connected through bus connectors.

[0004] In response to the above-mentioned related technologies, the busbar duct unit shell of the existing fire-resistant busbar duct is made of insulating material, the inside of the shell is filled with fire-resistant cotton, and the exposed conductive bar at the end is also wrapped with fire-resistant mica tape, ensuring its overall fire-resistant performance. However, the busbar connector connecting adjacent busbar duct units only seals the top and bottom of the busbar connector through a cover plate, and lacks a reliable fire-proof structure, resulting in poor fire-resistant performance at the connection of the busbar duct unit. Therefore, there is room for improvement. Summary of the Invention

[0005] In order to improve the fire resistance performance of the connection between adjacent bus duct units of a fire-resistant bus duct, the present application provides a fire-resistant bus duct.

[0006] This application provides a fire-resistant bus duct, which adopts the following technical solutions: A fire-resistant bus duct comprises several bus duct units, the conductive bars at adjacent ends of the adjacent bus duct units are connected via bus connectors, adjacent ends of the adjacent bus duct units are further provided with fireproof sleeves, both ends of the fireproof sleeves are respectively sleeved on the adjacent ends of the adjacent bus duct units, the bus connectors are located in the fireproof sleeves, and heat dissipation parts are provided on opposite sides of the fireproof sleeves, the heat dissipation parts include several heat dissipation holes provided on the fireproof sleeves; the outer periphery of the fireproof sleeves is wrapped with a fireproof expansion coating layer, and the fireproof expansion coating layer has through holes corresponding to the heat dissipation holes.

[0007] By adopting the above technical solution, by attaching fireproof sleeves to adjacent ends of two adjacent bus ducts, heat generated by the busbar connectors during daily use can be dissipated through the heat dissipation holes on both sides of the fireproof sleeves. In the event of a fire, the fireproof sleeves limit the spread of fire to the busbar connectors. Simultaneously, the fireproof intumescent coating layer expands upon heating and blocks the heat dissipation holes in the heat dissipation section, further limiting the spread of fire into the fireproof sleeves. This allows the busbar connectors located within the fireproof sleeves to operate normally, effectively improving the fire protection performance at the connection between adjacent bus duct units.

[0008] Preferably, both ends of the fireproof sleeve are threaded with limit bolts on the outside, and the limit bolts extend into the inner cavity of the fireproof sleeve and are tightly arranged against the outer side of the bus duct unit.

[0009] By adopting the above technical solution, after the two ends of the fireproof sleeve are respectively inserted into the adjacent ends of the adjacent bus duct units, the limiting bolts on the outside of the fireproof sleeve are turned so that the limiting bolts are pressed against the outside of the bus duct unit, thereby achieving the fireproof sleeve being firmly installed at the connection between the adjacent bus duct units.

[0010] Preferably, an air duct is supported on one side of the fireproof sleeve, the air duct is connected to the inner cavity of the fireproof sleeve through the heat dissipation portion, and a heat dissipation fan is installed in the inner cavity of the air duct.

[0011] By adopting the above technical solution, during the daily operation of the fire-resistant bus duct, the heat dissipation fan in the air duct is used to blow air toward the fire-proof casing. After the air flow enters the inner cavity of the fire-proof casing through the heat dissipation part on one side of the fire-proof casing, it is discharged through the heat dissipation part on the other side of the fire-proof casing. The air flow is used to directionally guide the heat generated by the bus connector, which is beneficial to further improve the heat dissipation effect at the connection of the bus duct unit.

[0012] Preferably, the inner cavity of the fireproof sleeve is further connected to a heat conducting pipe, a gap is left between the outer circumference of the heat conducting pipe and the inner circumference of the fireproof sleeve, and both ends of the heat conducting pipe are respectively sleeved on the adjacent end of the bus duct unit.

[0013] By adopting the above technical solution, the busbar connector is wrapped with a heat pipe. The heat generated by the busbar connector during operation is discharged through the heat pipe and carried out to the outside of the fireproof casing by the airflow flowing through the inner cavity of the fireproof casing. At the same time, the dust blown into the airflow in the fireproof casing by the subsequent fan can be restricted from contacting and contaminating the busbar connector.

[0014] Preferably, a plurality of fusible metal sheets are provided on the top and bottom of the air duct, and two ends of the fusible metal sheets are respectively connected to the air duct and the fireproof sleeve.

[0015] By adopting the above technical solution, the air duct and the fireproof casing are connected by using a fusible metal sheet. During the daily operation of the bus duct, the air duct can be firmly installed on the outside of the fireproof casing through the fusible metal sheet. When a fire occurs and the temperature rises to the melting temperature of the fusible metal sheet, the fusible metal sheet melts, so that the air duct can be detached from the fireproof casing, thereby limiting the subsequent fire from spreading to the fireproof casing after the internal components of the air duct catch fire.

[0016] Preferably, a plurality of annular fins are provided on the outer periphery of the heat conducting pipe, and gaps are left between adjacent annular fins.

[0017] By adopting the above technical solution, the annular fins are used to increase the contact area between the outer side of the heat pipe and the air, so that the heat generated by the busbar connector through the annular fins can be better dissipated, and the dissipated heat can be better carried out to the outside of the fireproof sleeve by the airflow flowing through the inner cavity of the fireproof sleeve.

[0018] Preferably, both ends of the fireproof sleeve are provided with fireproof expansion sealing rings, and the fireproof expansion sealing rings are provided to seal the gap between the fireproof sleeve and the bus duct unit.

[0019] By adopting the above technical solution, when a fire occurs inside the building, the fireproof expansion sealing ring expands when heated and further blocks the gap between the fireproof sleeve and the busbar duct unit, which is conducive to limiting the fire from entering the interior of the fireproof sleeve through the gap between the fireproof sleeve and the busbar duct unit.

[0020] Preferably, an annular limiting groove is provided on the inner periphery of the end portion of the fireproof sleeve corresponding to the fireproof expansion sealing ring, and the outer peripheral edge of the fireproof expansion sealing ring is embedded in the annular limiting groove.

[0021] By adopting the above technical solution, the fireproof expansion sealing ring is limited by the annular limiting groove, which limits the relative movement of the fireproof expansion sealing ring and the fireproof sleeve when the fireproof sleeve is subsequently slid, causing the fireproof expansion sealing ring to detach from the end of the fireproof sleeve, which is conducive to the fireproof expansion sealing ring being firmly installed at the end of the fireproof sleeve.

[0022] Preferably, a support bracket is connected to the bottom of the bus duct unit, and the support bracket includes a cross bar, and both ends of the cross bar are connected to suspension rods; a connecting bolt is passed through the bottom end of the cross bar, and the connecting bolt is threadedly connected to the bottom of the bus duct unit.

[0023] By adopting the above technical solution and setting up the support bracket, when the bus duct unit is subsequently installed, it is fixed to the ceiling through the two hangers of the support bracket, and then the bus duct unit is placed on the cross bar of the support bracket. The cross bar and the main body of the bus duct are connected by connecting bolts, so that the bus duct unit can be firmly installed under the ceiling.

[0024] Preferably, a method for installing the fire-resistant bus duct as described above comprises the following steps: S1: Support and hanger installation: Install and fix the support and hanger for hanging bus duct units above the ceiling; S2: Put the bus duct unit of the starting section in place: Place the bus duct unit on the crossbar of the support bracket; S3: Fixing the bus duct unit in the starting section: Connect the bus duct unit and the crossbar of the support bracket through connecting bolts; S4: Fireproof sleeve installation: insert the fireproof sleeve into the end of the fixed bus duct unit; S5: Place the common bus duct unit in place: After placing the bus duct unit on the crossbar of the support bracket, slide the fireproof sleeve at the end of the fixed bus duct unit so that both ends of the fireproof sleeve are respectively connected to the adjacent end of the adjacent bus duct unit; S6: Fixing the ordinary bus duct unit: Connect the bus duct unit to the crossbar of the support bracket with connecting bolts; slide the fireproof sleeve completely into the end of the bus duct unit; S7: Busbar connector installation: Connect the conductive bars at the adjacent ends of adjacent busbar duct units through busbar connectors. S8: Fireproof sleeve in place: Slide the fireproof sleeve at the end of the bus duct unit so that both ends of the fireproof sleeve are respectively connected to the adjacent end of the adjacent bus duct unit; S9: Repeat steps S4 to S8 until the installation of the remaining bus duct units is completed.

[0025] By adopting the above technical solution: on the one hand, the fireproof sleeve can be used as a fireproof structure at the connection between the adjacent ends of the bus duct units, which is beneficial to improving the fireproof effect of the busbar connector; on the other hand, when installing and fixing the bus duct units, the two ends of the fireproof sleeve are respectively sleeved on the adjacent ends of the adjacent bus duct units, and then the cross bar of the support bracket and the bus duct unit are connected by connecting bolts. The fireproof sleeve is used to position the adjacent bus duct units, which is beneficial to make the bus duct units better relative to each other and facilitate the subsequent installation of the busbar connector at the adjacent end of the adjacent bus duct units.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By attaching fireproof sleeves to adjacent ends of adjacent bus duct units, heat generated by the busbar connectors is discharged through the heat dissipation holes in the heat dissipation section of the fireproof sleeves during daily use. In the event of a fire, the fireproof sleeves can limit the spread of fire from contacting the busbar connectors. At the same time, the fireproof expansion coating layer on the outside of the fireproof sleeves can be expanded by heat to block the heat dissipation holes in the heat dissipation section, limiting the spread of fire into the fireproof sleeves. This ensures the normal operation of the busbar connectors within the fireproof sleeves and effectively improves the fireproof performance of the connections between adjacent bus duct units. Furthermore, the fireproof sleeves can assist in positioning the bus duct units during installation, aligning adjacent bus duct units, facilitating subsequent installation of busbar connectors.

[0027] 2. By connecting an air duct to the heat dissipation portion on one side of the fireproof casing and installing a heat dissipation fan in the air duct, during daily operation, the heat dissipation fan can blow air through the heat dissipation portion toward the inner cavity of the connected air duct. The airflow entering the inner cavity of the fireproof casing entrains heat and is discharged through the heat dissipation portion on the other side of the fireproof casing, which is conducive to better heat dissipation of the busbar connector.

[0028] 3. The air duct and the fireproof casing are connected by a fusible metal sheet. When a fire occurs later, the fusible metal sheet can melt by itself, so that the air duct can automatically detach from the fireproof casing, limiting the spread of the fire inside the air duct to the fireproof casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the fire-resistant bus duct used in the embodiment of the present application.

[0030] Figure 2 This is a structural diagram of a bus duct unit, a busbar connector, and a fireproof sleeve according to an embodiment of the present application.

[0031] Figure 3 This is a schematic diagram of the interior of a fireproof casing according to an embodiment of the present application.

[0032] Figure 4 This is a schematic diagram of the structure of the heat pipe used in the embodiment of the present application.

[0033] Figure 5 This is a schematic diagram used to illustrate the connection relationship between the bus duct unit and the support bracket in an embodiment of the present application.

[0034] Description of reference numerals: 1. Bus duct unit; 2. Busbar connector; 3. Fireproof sleeve; 30. Fireproof expansion seal; 31. Heat dissipation hole; 32. Limit bolt; 33. Heat pipe; 331. Annular fin; 330. Connecting piece; 4. Air duct; 41. Cooling fan; 5. Fusible metal sheet; 6. Support bracket; 61. Cross bar; 611. Connecting bolt; 62. Hanger; 621. Connecting plate. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] The embodiments of the present application disclose a fire-resistant bus duct and an installation method thereof.

[0037] A fire-resistant bus duct, refer to Figure 1 and Figure 2 The system comprises several bus duct units 1. The conductive bars at adjacent ends of adjacent bus duct units 1 are connected via bus connectors 2. Fire-resistant sleeves 3 are also provided at adjacent ends of adjacent bus duct units 1. The ends of the fire-resistant sleeves 3 are respectively sleeved onto the adjacent ends of adjacent bus duct units 1. The outer periphery of the fire-resistant sleeves 3 is coated with a layer of fire-retardant intumescent coating. The fire-resistant sleeves 3 protect the bus connectors 2, effectively improving the fire resistance of the bus connectors 2 at the connection points of the bus duct units 1.

[0038] In this embodiment, the fireproof sleeve 3 is made of a high-temperature-resistant metal material. A number of stop bolts 32 are threaded through the outer sides of each end of the fireproof sleeve 3. These stop bolts 32 abut against the ends of adjacent bus duct units 1. These stop bolts 32 position the fireproof sleeve 3, preventing it from slipping and facilitating a more secure installation at the junction of adjacent bus duct units 1.

[0039] Reference Figure 2 and Figure 3 The fireproof sleeve 3 is provided with heat dissipation sections on opposite sides. The heat dissipation sections include a plurality of heat dissipation holes 31 formed on the side of the fireproof sleeve 3. The heat dissipation holes 31 are arranged in a square pattern. The heat dissipation sections allow heat generated by the busbar connector 2 within the fireproof sleeve 3 to be discharged outside the fireproof sleeve 3 through the heat dissipation holes 31.

[0040] In this embodiment, the fire-retardant expansion coating layer is formed by applying an expandable ultra-thin fire-retardant coating; the fire-retardant expansion coating layer is provided with a through hole corresponding to the heat dissipation hole 31, and the through hole is connected to the heat dissipation hole 31; the inner periphery of the heat dissipation hole 31 is applied with fire-retardant expansion coating; when a fire occurs subsequently, the fire-retardant expansion coating layer at the heat dissipation hole 31 and the fire-retardant coating in the heat dissipation hole 31 expand due to heat to block the heat dissipation hole 31 of the heat dissipation part, so as to limit the fire from spreading through the heat dissipation hole 31 to the fire-retardant sleeve 3.

[0041] Reference Figure 2 and Figure 3 A duct 4 is also provided at the heat dissipation part on one side of the fireproof sleeve 3. One end of the duct 4 is connected to several heat dissipation holes 31 of the heat dissipation part. A heat dissipation fan 41 is installed in the duct 4. The heat dissipation fan 41 is arranged toward the heat dissipation part. When the fire-resistant bus duct is subsequently in operation, air can be blown into the inner cavity of the fireproof sleeve 3 through the heat dissipation holes 31 by the heat dissipation fan 41. The airflow entering the inner cavity of the fireproof sleeve 3 exchanges heat with the bus generator and is discharged through the heat dissipation part on the other side of the fireproof sleeve 3, which is beneficial to further improve the heat dissipation effect of the busbar connector 2.

[0042] Reference Figure 2 and Figure 3 The top and bottom of the air duct 4 are each provided with a plurality of fusible metal plates 5, made of a low-melting-point metal. Each end of the fusible metal plates 5 is fixed to the air duct 4 and the fireproof casing 3 with screws, respectively. The fusible metal plates 5 securely connect the air duct 4 to the fireproof casing 3. In the event of a subsequent fire, the high temperature will melt the fusible metal plates 5, allowing the air duct 4 to drive the cooling fan 41 out of the fireproof casing 3, thus preventing the fire from spreading to the fireproof casing 3 if the air duct 4 and its internal components are ignited.

[0043] Reference Figure 3 and Figure 4A heat pipe 33 is also supported inside the fireproof sleeve 3. The outer periphery of the heat pipe 33 is connected to the inner periphery of the fireproof sleeve 3 via a connecting piece 330. The heat pipe 33 is sleeved around the outer periphery of the busbar connector 2, and its two ends are respectively sleeved on the adjacent ends of the adjacent busbar duct unit 1. The heat pipe 33 is made of a metal material with good thermal conductivity, so that the heat generated by the busbar connector 2 can be better dissipated through the heat pipe 33.

[0044] The provision of the heat pipe 33 helps to limit the dust carried by the airflow blown into the fireproof sleeve 3 through the heat dissipation fan 41 from adhering to and accumulating on the busbar connector 2, resulting in poor contact between the busbar connector 2 and the conductive bar of the busbar trough unit 1.

[0045] The heat pipe 33 is sheathed with a number of annular fins 331, which are evenly distributed along the heat pipe 33, with gaps between adjacent annular fins 331. The annular fins 331 increase the outer surface area of ​​the heat pipe 33, facilitating better dissipation of heat generated by the busbar connector 2 through the heat pipe 33. This also facilitates the subsequent airflow through the inner cavity of the fireproof sleeve 3 to better carry heat out of the fireproof sleeve 3.

[0046] Reference Figure 2 and Figure 3 Fireproof expansion seals 30 are installed at both ends of the inner cavity of the fireproof sleeve 3. The fireproof expansion seals 30 seal the gap between the fireproof sleeve 3 and the end of the busbar duct unit 1. In the event of a subsequent fire, the fireproof expansion seals 30 can be used to expand due to heat and further seal the gap between the fireproof sleeve 3 and the busbar duct unit 1.

[0047] An annular limiting groove is provided on the inner circumference of the fireproof sleeve 3 corresponding to the fireproof expansion sealing ring 30, and the outer peripheral edge of the fireproof expansion sealing ring 30 is embedded in the corresponding annular limiting groove. The annular limiting groove is used to limit the fireproof expansion sealing ring 30, so as to limit the fireproof expansion sealing ring 30 from being subjected to force and moving relative to the fireproof sleeve 3 during the subsequent installation and sliding process of the fireproof sleeve 3, resulting in the fireproof expansion sealing ring 30 being separated from the fireproof sleeve 3.

[0048] Reference Figure 1 and Figure 5 The bottom of each bus duct unit 1 is provided with a number of supports and hangers 6, which are used to connect to the ceiling so as to securely suspend the bus duct unit 1 below the ceiling. The supports and hangers 6 include a crossbar 61, with hangers 62 vertically connected at both ends of the crossbar 61. A connecting plate 621 is installed at the top of the hanger 62, which is used to be fixed to the ceiling with expansion bolts. The bottom of the bus duct unit 1 is overlapped with the crossbar 61, and two long holes are opened at the bottom of the crossbar 61. Connecting bolts 611 are passed through the long holes. The connecting bolts 611 are threadedly connected to the bottom of the bus duct unit 1, thereby achieving a secure connection between the supports and hangers 6 and the bus duct unit 1.

[0049] A fire-resistant bus duct installation method, refer to Figure 3 and Figure 5 , including the following steps: S1: Installation of the support and hanger 6: Fix the top connecting plates 621 of the two hanger rods 62 of the support and hanger 6 to the ceiling through expansion bolts to install the support and hanger 6 on the ceiling.

[0050] S2: The starting section bus duct unit 1 is placed in place: the bus duct unit 1 is placed on the crossbar 61 of the support bracket 6; S3: Fixing the starting section bus duct unit 1: Insert the connecting bolts 611 into the long holes on the crossbar 61 and thread them to the bottom of the bus duct unit 1.

[0051] S4: Installation of the fireproof sleeve 3: Insert the fireproof sleeve 3 and one end of the heat conducting pipe 33 into the fixed end of the bus duct unit 1.

[0052] S5: Ordinary bus duct unit 1 is in place: The specific steps are as follows: S5.1: After placing the bus duct units 1 on the crossbars 61 of the support brackets 6, preliminarily adjust the bus duct units 1 so that adjacent bus duct units 1 are initially facing each other; S5.2: Slide the fireproof sleeve 3 located at the end of the fixed bus duct unit 1 so that the two ends of the fireproof sleeve 3 and the heat pipe 33 are respectively connected to the adjacent end of the adjacent bus duct unit 1 to achieve the positioning of the adjacent bus duct unit 1.

[0053] S6: Fix the ordinary bus duct unit 1: insert the connecting bolt 611 into the long hole on the cross bar 61 and thread it to the bottom of the bus duct unit 1; slide the fireproof sleeve 3 completely to the end of the bus duct unit 1; S7: Busbar connector 2 installation: Connect the conductive bars at the adjacent ends of adjacent busbar duct units 1 through busbar connector 2.

[0054] S8: Fireproof casing 3 is in place: S8.1: Slide the fireproof sleeve 3 so that both ends of the fireproof sleeve 3 are respectively connected to the adjacent ends of the adjacent bus duct unit 1; S8.2: Tighten the limiting bolts 32 at both ends of the fireproof sleeve 3 until the limiting bolts 32 at both ends of the fireproof sleeve 3 are respectively pressed against the adjacent bus duct units 1.

[0055] S9: Repeat steps S4 to S8 until the installation of the remaining bus duct units 1 is completed.

[0056] The implementation principle of the embodiment of the present application is: during the daily operation of the fire-resistant bus duct, the heat dissipation fan 41 in the air duct 4 outside the fire-proof sleeve 3 blows hot air toward the fire-proof sleeve 3, so as to promptly bring the heat generated by the busbar connector 2 out of the fire-proof sleeve 3; when a fire occurs, the fire-proof sleeve 3 is used to limit the spread of the fire to the busbar connector 2, and at the same time, the fire-proof expansion coating layer on the outer periphery of the fire-proof sleeve 3 expands and blocks the heat dissipation holes 31 on both sides of the fire-proof sleeve 3, thereby effectively improving the fire resistance of the busbar connector 2.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A fire-resistant bus duct, comprising a plurality of bus duct units (1), wherein the conductive bars at adjacent ends of the adjacent bus duct units (1) are connected via a bus connector (2), characterized in that: A fireproof sleeve (3) is further provided at a proximate end of the adjacent bus duct unit (1), and both ends of the fireproof sleeve (3) are respectively sleeved on a proximate end of the adjacent bus duct unit (1). The bus connector (2) is located in the fireproof sleeve (3), and heat dissipation parts are provided on opposite sides of the fireproof sleeve (3). The heat dissipation parts include a plurality of heat dissipation holes (31) provided on the fireproof sleeve (3); the outer periphery of the fireproof sleeve (3) is wrapped with a fireproof expansion coating layer, and the fireproof expansion coating layer is provided with through holes corresponding to the heat dissipation holes (31).

2. The fire-resistant bus duct according to claim 1, characterized in that: Limit bolts (32) are threadedly provided on the outer sides of both ends of the fireproof sleeve (3); the limit bolts (32) extend into the inner cavity of the fireproof sleeve (3) and are tightly arranged against the outer side of the bus duct unit (1).

3. The fire-resistant bus duct according to claim 1, characterized in that: An air duct (4) is supported on one side of the fireproof casing (3); the air duct (4) is connected to the inner cavity of the fireproof casing (3) through the heat dissipation portion; and a heat dissipation fan (41) is installed in the inner cavity of the air duct (4).

4. The fire-resistant bus duct according to claim 3, characterized in that: The inner cavity of the fireproof sleeve (3) is also connected to a heat conduction pipe (33), a gap is left between the outer peripheral side of the heat conduction pipe (33) and the inner peripheral side of the fireproof sleeve (3), and the two ends of the heat conduction pipe (33) are respectively sleeved on the adjacent end of the bus duct unit (1).

5. The fire-resistant bus duct according to claim 3, characterized in that: A plurality of fusible metal sheets (5) are provided at the top and bottom of the air duct (4), and two ends of the fusible metal sheets (5) are respectively connected to the air duct (4) and the fireproof sleeve (3).

6. The fire-resistant bus duct according to claim 4, characterized in that: The outer periphery of the heat conducting pipe (33) is sheathed with a plurality of annular fins (331), with gaps being left between adjacent annular fins (331).

7. The fire-resistant bus duct according to claim 1, characterized in that: Fireproof expansion sealing rings (30) are provided at both ends of the fireproof sleeve (3), and the fireproof expansion sealing rings are provided to seal the gap between the fireproof sleeve (3) and the bus duct unit (1).

8. The fire-resistant bus duct according to claim 7, characterized in that: An annular limiting groove is provided on the inner periphery of the end of the fireproof sleeve (3) corresponding to the fireproof expansion sealing ring (30), and the outer periphery of the fireproof expansion sealing ring (30) is embedded in the annular limiting groove.

9. The fire-resistant bus duct according to claim 1, characterized in that: The bottom of the bus duct unit (1) is connected to a support bracket (6), and the support bracket (6) includes a cross bar (61), and both ends of the cross bar (61) are connected to suspension rods (62); a connecting bolt (611) is passed through the bottom end of the cross bar (61), and the connecting bolt (611) is threadedly connected to the bottom of the bus duct unit (1).

10. A method for installing a fire-resistant bus duct according to claim 9, characterized in that: The following steps are involved: S1: Installation of support bracket (6): Install and fix the support bracket (6) for hanging the bus duct unit (1) above the ceiling; S2: Putting the starting section bus duct unit (1) in place: placing the bus duct unit (1) on the crossbar (61) of the support bracket (6); S3: Fixing the starting section bus duct unit (1): connecting the bus duct unit (1) and the crossbar (61) of the support bracket (6) by connecting bolts (611); S4: Fireproof sleeve (3) installation: insert the fireproof sleeve (3) into the end of the fixed bus duct unit (1); S5: Putting the common bus duct unit (1) in place: After placing the bus duct unit (1) on the crossbar (61) of the support bracket (6), slide the fireproof sleeve (3) fixed at the end of the bus duct unit (1) so that both ends of the fireproof sleeve (3) are respectively connected to the adjacent ends of the adjacent bus duct unit (1); S6: Fixing the ordinary bus duct unit (1): Connect the bus duct unit (1) and the crossbar (61) of the support bracket (6) through the connecting bolts (611); Slide the fireproof sleeve (3) completely into the end of the bus duct unit (1); S7: Busbar connector (2) installation: Connect the conductive bars of adjacent busbar duct units (1) at the adjacent end through the busbar connector (2). S8: Fireproof sleeve (3) in place: slide the fireproof sleeve (3) at the end of the bus duct unit (1) so that both ends of the fireproof sleeve (3) are respectively sleeved on the adjacent ends of the adjacent bus duct unit (1); S9: Repeat steps S4 to S8 until the installation of the remaining bus duct units (1) is completed.

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