CN104577914A - Fire-resistant bus duct and method of constructing same - Google Patents

Abstract

The invention discloses a fire-resistant bus duct and a method of constructing the same. By improving fire-resistant performance of the bus duct, the fire-resistant standard can be met and the short circuit phenomenon that arises from heat collection of a connecting part of the bus duct due to convective heat transfer is avoided. Additionally, retraction-induced distortion due to thermal deformation of the bus duct is avoided. Furthermore, stability and reliability can be ensured by fulfilling the normal function for enough long time in case of fire disasters.

Description

Refractory busway and its construction method

technical field

The present invention relates to a fire-resistant busway and its construction method, and more specifically, it relates to meeting the strengthened fire-resistant standard by improving the fire-resistant performance, and blocking the temperature rise caused by heat transfer, and in the event of a fire within a sufficient time A fire-resistant busway and its construction method that can ensure stability and reliability by exerting normal functions.

Background technique

Generally, as a medium for transmitting electric energy, cables have been used in the past, and recently, bus ducts have been used as a substitute for cables. The busway has a busbar (bus bar) that functions as a conductor core wire in a cable, so it can conduct a large-capacity current.

In the past, the power wiring method used the wiring method using cables, but the wiring method using bus ducts (bus ducts) with bus bars (bus bars) has gradually increased in high-rise buildings and large factories.

This kind of busway and cable have something in common in having conductors and insulators, but the difference between the two is that cables use plastic or rubber to protect or insulate conductors, while busway transmits large-capacity current through conductors. Therefore, it is difficult to directly use insulators for protection, so the busbars are wrapped with insulators, and the busbars are built into metal slots.

This kind of busway is not only easy to add and relocate, but also can be easily dealt with when there is an abnormality or accident in the power wiring of the busway, and can be quickly restored, so it is widely used in places that use relatively large power.

Moreover, compared with the past, the power supply system of today's buildings tends to be larger and requires a large amount of energy. Therefore, according to this trend, the use of bus ducts that are safe and have low energy loss is rapidly increasing. .

For example, busway is used in factories, buildings, apartment buildings, hypermarkets, commercial buildings, R&D industrial parks, department stores, golf courses, tunnels, semiconductor and LCD factories, chemicals, oil refining, steelmaking, super high-rise buildings, ultra-high voltage In facilities in various fields such as substations, liquefied natural gas receiving stations, new airports, ports, etc.

Since the busbar arranged inside the busway usually flows through high-voltage current, it is set in a busway of a specified size in a state of isolation from the outside, and the busway containing such a busbar is manufactured into a unit with a certain length. , and carry out connection construction according to the facilities and power distribution design to be set up.

On the other hand, the main subject of manufacturing or construction of bus ducts recently is to improve the function and performance of bus ducts under extreme temperature conditions, especially in case of fire. For the sake of safety, it is necessary to maximize the performance that can delay the spread of fire and be fire-resistant, that is, the fire-resistant performance of the busway.

The higher the fire-resistance of the bus duct, the more it can extend the electrification capacity in the event of a fire, and by delaying the spread of the fire, it can gain the time required to evacuate people or arrange appropriate fire-fighting means.

Nowadays, the requirements for fire-resistant properties are gradually increasing. In particular, busway products used in land and sea plants and high-rise building infrastructure need to have higher fire-resistant properties. When a fire breaks out in factories, high-rise buildings, etc., it is necessary to operate and maintain fire-fighting/disaster prevention systems such as fire-fighting power supplies, fire alarms, and fire extinguishers of core equipment within a minimum time for personnel to escape or evacuate groove.

Regarding this kind of refractory busway, in the past, the structure of heat-insulating the outer box or the inner busbar, that is, the conductor, has been adopted simply through the interlayer. However, when exposed to flames for a long time, the outer box or the inner conductor are easy to melt, especially It includes a joint with a relatively low heat-resistant temperature, so it is difficult to meet the target fire-resistant performance when performing a fire-resistant test.

In addition, in order to improve the refractory performance, when the structure of the heat insulating material is mixed with cast molding, the refractory performance can be improved to a certain extent, but the product manufacturing process is complicated and a separate mold is required Made on site.

In addition, as the importance of fire-resistant performance becomes more and more important, the specifications for fire-resistant conditions are becoming more and more strict. In order to be similar to actual laying conditions, as a standard (KS C IEC60331-11), it is required to include the connection part when setting the test method, that is, it needs to prove In the state where the whole test sample is placed in the fire chamber (not locally heated), the temperature is above 900 degrees for 60 minutes (JIS8364 fire resistance standard) fire resistance performance.

Therefore, there is an urgent need for a fire-resistant busway, which can meet the enhanced fire-resistant standards by improving the fire-resistant performance, and block the temperature rise caused by heat transfer, and play a long enough normal function in the event of a fire, so as to ensure stability and reliability.

Contents of the invention

The embodiments of the present invention aim to meet the enhanced fire resistance standard by improving the fire resistance performance of the busway.

Also, the present invention aims to prevent the occurrence of a short circuit caused by convective heat transfer causing heat to accumulate at the connection portion of the bus duct.

Moreover, the present invention aims to prevent the phenomenon that the bus duct is stretched and twisted due to thermal deformation.

In addition, the invention aims at normal functioning for a long enough time in the event of a fire to ensure stability and reliability.

One aspect of the present invention provides a fire-resistant busway, which includes: a first outer box, which is provided with a busbar inside, and in order to strengthen the strength, the upper surface and the lower surface are equipped with wings extending sideways; the first The heat insulating material is filled between the wings of the upper surface and the lower surface, and is used to block the convective heat transfer with air as the medium.

The fire-resistant busway of the present invention may further include: supporting members, arranged at regular intervals on the base, for supporting the first outer box at a prescribed height; The outer box is fixed on the supporting member.

The fire-resistant busway of the present invention may further include a second heat insulating material, which is arranged at least one of between the support member and the first outer box or between the support member and the base, so as to Conductive heat transfer through the support member is blocked.

The second heat insulating material may further wrap the main body of the supporting member.

A heat insulating material may be provided on the entire upper surface of the base for heat insulating treatment.

The fire-resistant busway of the present invention may further include: a second outer box, which is disposed on the upper side of the base in a manner surrounding the outer side of the first outer box; a third heat insulating material, filled in the first outer box In the space between the first outer box, the second outer box and the base, convective heat transfer is blocked.

The refractory bus duct of the present invention may further include a fourth heat insulating material, and the fourth heat insulating material wraps the outer side of the connection part for connecting adjacent bus ducts.

A coupling hole for bolt coupling formed in the supporting member may be formed in a slit shape.

According to another aspect of the present invention, there is provided a construction method for fire-resistant busway, which may include the following steps: the step of cutting the heat insulating material according to the size to be set; in order to block the convective heat transfer with air as the medium, A step of filling the wings of an outer box with the heat insulating material; arranging support members at regular intervals on the base, and after placing the first outer box on the upper side of the support members, combining the fixed straps to a step of arranging the first outer box fixedly; and a step of arranging the second outer box outside the first outer box.

The fire-resistant busway construction method of the present invention may further include the step of arranging heat insulating materials in the first outer box in areas other than the support member and the fixed strapping portion.

The fire-resistant busway construction method of the present invention may further include, in order to block the conduction heat transfer through the support member, the step of heat-insulating the support member.

For the heat insulation treatment of the support member, a heat insulating material may be provided at least one of between the first outer case or between the support member and the base.

The heat insulating material may further wrap the main body of the supporting member.

The heat insulating material arranged between the support member and the base is extended to the entire upper surface of the base, or a heat insulating material is further provided on the entire upper surface of the base to perform heat insulation treatment .

The construction method of the fire-resistant bus duct of the present invention may further include the step of wrapping the outer side of the fixed tape with a heat insulating material.

The construction method of the fire-resistant busway of the present invention may further include the step of further wrapping the entire outer side of the first outer box with a heat insulating material.

The construction method of the fire-resistant busway of the present invention may further include the step of assembling a second outer box on the upper side of the first outer box.

The construction method of the fire-resistant busway of the present invention may further include the step of inserting heat insulating material outside the connecting portion after connecting the adjacent busway at the connecting portion.

In order to perform the connection work of the connection part, a blank part in which the heat insulating material is not inserted may be provided.

The embodiments of the present invention can meet the strengthened fire resistance standard by improving the fire resistance performance of the bus duct.

Moreover, it is possible to prevent short circuit phenomenon caused by heat accumulation at the connecting portion of the bus duct due to convective heat transfer.

In addition, it can prevent the bus duct from being twisted due to expansion and contraction caused by thermal deformation.

In addition, stability and reliability can be ensured by performing normal functions for a sufficiently long time in the event of a fire.

Description of drawings

Fig. 1 and Fig. 2 are an exploded perspective view and a cross-sectional view of a refractory bus duct according to an embodiment of the present invention before construction of a heat insulating material.

Fig. 3 and Fig. 4 are an exploded perspective view and a cross-sectional view of a fire-resistant bus duct according to an embodiment of the present invention after construction of a heat insulating material.

Fig. 5 is a perspective view showing an example of a heat insulating material applied to a fire-resistant bus duct according to an embodiment of the present invention.

6 to 8 are diagrams showing the state of filling the heat insulating material in the wings of the refractory bus duct according to an embodiment of the present invention.

9 to 11 are diagrams showing the state of the outer side of the first outer box of the fire-resistant bus duct wrapped with a heat insulating material according to an embodiment of the present invention.

12 to 13 are diagrams showing the state of inserting a heat insulating material on the upper surface of the base of the refractory bus duct according to an embodiment of the present invention.

Fig. 14 to Fig. 16 are diagrams showing the state of heat insulation treatment of the support member of the refractory bus duct according to an embodiment of the present invention.

Fig. 17 is a partial perspective view showing a state in which the connecting holes of the support members of the fire-resistant bus duct according to one embodiment of the present invention are formed in the shape of slits.

Fig. 18 and Fig. 19 are diagrams showing a state in which a heat insulating material is applied between the first outer box and the supporting member of the fire-resistant bus duct according to an embodiment of the present invention.

Fig. 20 to Fig. 22 are diagrams showing the outer side of the fixed tape wrapping the refractory bus duct with heat insulating material according to an embodiment of the present invention.

Fig. 23 and Fig. 24 are diagrams showing the state of further wrapping the heat insulating material before assembling the second outer box of the refractory bus duct according to an embodiment of the present invention.

Fig. 25 and Fig. 26 are diagrams showing the way of wrapping the connection part of the refractory bus duct and the heat insulating material according to one embodiment of the present invention.

Fig. 27 shows the state of the internal temperature distribution in the fire test of the fire-resistant bus duct according to one embodiment of the present invention.

reference sign

101: bus bar 103: base

110: The first outer box 112: Wings

120: Support member 122: Support member combination hole

130: Fixed strap 132: Fixed strap combination hole

140: Second outer box 150: Connection part

200: heat insulation material 210: first heat insulation material

220: Second insulation material 230: Third insulation material

240: The fourth heat insulation material 1000: Refractory busway

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described here, and the present invention can be embodied in other forms. The embodiments described here are provided to make the disclosure more thorough and complete, and to fully convey the idea of the present invention to those skilled in the art. The same reference numerals denote the same constituent elements throughout the specification.

Figure 1 and Figure 2 are exploded perspective views and cross-sectional views of the fire-resistant bus duct of an embodiment of the present invention before construction of heat-insulating materials, and Figures 3 and 4 are construction of heat-insulating materials for the fire-resistant bus duct of an embodiment of the present invention Later exploded perspective view and cross-sectional view.

Referring to Fig. 1 to Fig. 4, a refractory busway 1000 according to an embodiment of the present invention roughly includes: a first outer box 110, which has a busbar 101 inside, and in order to strengthen the strength, the upper surface and the lower surface are provided with laterally extending The wings 112 ; the first heat insulating material 210 is filled between the wings 12 on the upper surface and the lower surface to block convective heat transfer using air as a medium.

First, observe the basic structure of a fire-resistant busway 1000 according to an embodiment of the present invention, which includes a first outer box 110 forming a predetermined space inside. Inside the first outer box 110 is provided a bus bar 101 serving as a conductor core included in the cable, and a large-capacity current flows through the bus bar 101 .

Since the bus bar 101 usually flows high-voltage current, it is first wrapped with an insulator to insulate it from the outside, and then stored inside the first outer box 110 for protection. The first outer box 110 including the bus bar 101 can be made into a unit with a certain length.

In order to strengthen the strength, a certain length of wings 112 is formed extending to both sides of the upper surface and the lower surface of the first outer box 110 . Accordingly, a predetermined space is formed between the upper and lower wing portions 112 .

The first outer box 110 provided with the bus bar 101 can be installed on the plate base 103 , at this time, support members 120 are provided at regular intervals to support the first outer box 110 at a certain height of the base 103 .

The supporting member 120 may be arranged every about 1.5m, and in this embodiment, the supporting member 120 is formed to have Channel steel with cross-section, but not limited thereto.

In the state where the first outer box 110 is placed on the support member 120 , the fixing strap 130 may be combined from the upper side to fix the first outer box 110 on the support member 120 . Support member coupling holes 122 may be formed on the support member 120 so as to be bolted to the base 103 and the fixed strap 130 , and a corresponding fixed strap may also be formed on the fixed strap 130 Combination hole 132 .

In this way, the first outer box 110 is set on the base 103 through the support member 120 and the fixing strap 130, and then the second outer box 140 is covered and assembled from the upper side, thereby completing the production of the unit, and the finished unit is connected by connecting The portion 150 (see FIG. 25 ) is connected to adjacent cells.

On the other hand, the refractory bus duct 1000 according to an embodiment of the present invention may include a first heat insulating material 210, which is filled between the wings 112 on the upper surface and the lower surface, and is used to block the Convective heat transfer.

As described above, although the wing portion 112 of the first outer box 110 is provided for strengthening strength, heat transfer through the space formed by the wing portion 112 may become a problem in case of fire. In other words, convective heat transfer through the heated air at this location may cause heat to accumulate in the connecting portion 150 to cause a short circuit.

The first heat insulating material 210 filled between the upper and lower surface wing portions 112 functions to block such convective heat transfer. It has been shown in actual fire experiments that the heat transfer through the wings 112 has a great influence on the internal temperature rise, so by using the first heat insulating material 210, this convective heat transfer is blocked, so that when a fire occurs, Make the refractory bus duct 1000 able to support for a long enough time.

On the other hand, in order to block the conductive heat transfer through the support member 120, the fire-resistant bus duct 1000 of the present invention may further include a second heat insulating material 220, which is arranged between the support member 120 and the first outer wall. At least one between the boxes 110 or between the supporting member 120 and the base 103 .

When the refractory busway 1000 is exposed to a thermal environment, the heat transfer path can be roughly divided into convective heat transfer and conductive heat transfer, wherein the conductive heat transfer through the support member 120 also reaches a non-negligible level in the long-term fire resistance test. amount, so thermal insulation is required.

Therefore, as shown in FIG. 3 and FIG. 4 , it is preferable to use a second The insulating material 220 is separately insulated to minimize conductive heat transfer, preferably a second insulating material 220 is used in both places.

At this time, the second heat insulating material 220 between the support member 120 and the first outer box 110 also functions to block heat transfer between the support member 120 and the fixing tape 130 . Moreover, the second heat insulating material 220 may further wrap the entire body of the supporting member 120 .

On the other hand, the fire-resistant bus duct 1000 of the present invention may further include a third heat insulating material 230, which fills the space between the first outer box 110, the second outer box 140 and the base 103 inside to block convective heat transfer.

Similar to the first heat insulating material 210 filled in the space between the wings 112 to block the convective heat transfer, the third heat insulating material 230 is used to block the heat passing through the first outer box 110 and the Heat transfer in the space formed between the two outer boxes 220 and the base 103 .

In addition, the third heat insulating material 230 also plays a role of preliminarily blocking the radiant heat directly penetrating from the outside of the second outer box 140 to the inside of the refractory bus duct 1000 .

In this way, by using the first heat insulating material 210, the second heat insulating material 220, and the third heat insulating material 230, the convective heat transfer through the space formed inside the double outer box structure of the present invention can be effectively blocked, and at the same time, Improves thermal blocking efficiency by blocking conductive heat transfer through the supporting structure and radiant heat that penetrates directly from the outside.

Accordingly, the fire-resistant bus duct 1000 of the present invention can ensure sufficient fire resistance at 1000° C. or higher for 90 minutes required by the target JIS8364 standard even under severe flame conditions.

On the other hand, the refractory bus duct 1000 of the present invention may further include a fourth heat insulating material 240 (see Figure 25 and Figure 26 ) to wrap the connection part 150 for connecting adjacent bus ducts (see Figure 25 and Figure 26 ). 26) Outer side, which will be explained later.

The construction method of the refractory busway 1000 with the above structure will be described in detail below with reference to the accompanying drawings.

Fig. 5 is a perspective view showing an embodiment of a heat insulating material suitable for a fire-resistant bus duct according to an embodiment of the present invention, and Figs. The state diagram of the heat material, Fig. 9 to Fig. 11 are the state diagrams showing the outer side of the refractory busway of an embodiment of the present invention wrapped with heat insulating material, and Fig. 12 to Fig. 13 are the state diagrams showing the refractory busway of an embodiment of the present invention Figure 14 to Figure 16 are state diagrams showing the heat insulation treatment of the support member of the refractory bus duct according to an embodiment of the present invention, and Figure 17 shows an embodiment of the present invention Figure 18 and Figure 19 are partial perspective views of the state in which the supporting member coupling hole of the fire-resistant bus duct is formed in the shape of a slit, and Figure 18 and Figure 19 show between the first outer box and the supporting member of the fire-resistant bus duct according to an embodiment of the present invention Figure 20 to Figure 22 are state diagrams showing the outer side of the fixed tape wrapping the refractory bus duct with heat insulating material according to an embodiment of the present invention, and Figure 23 and Figure 24 are diagrams showing an implementation of the present invention Figure 25 and Figure 26 show the way of wrapping the connection part of the fire-resistant busway and the heat-insulating material in an embodiment of the present invention diagram.

Referring to Fig. 5 to Fig. 26, the construction method of the refractory bus duct 1000 according to an embodiment of the present invention generally includes: the step of cutting according to the size of the heat insulating material 200 to be installed; in order to block the convective heat with air as the medium Passing, the step of filling the heat insulating material 200 in the wing portion 112 of the first outer box 110; setting the support member 120 on the base 103 at a predetermined interval, and placing the first support member 120 on the upper side of the support member 120 An outer box 110 , followed by a step of fixing the first outer box 110 by combining the fixing tape 130 ; and a step of arranging the second outer box 140 outside the first outer box 110 .

The heat insulating material 200 suitable for the refractory busway 1000 of the present invention may be ceramic fiber (cerakwool). As shown in FIG. 5 , ceramic fibers can be manufactured into a blanket shape, specifically, after continuous lamination of fibrous spun ceramic fibers (spun ceramic fibers), they are formed into a blanket shape by needle punching.

Ceramic fiber exhibits an excellent thermal insulation effect due to its very low thermal conductivity at high temperatures, and is composed of silica (silica) and alumina (alumina), so it has excellent corrosion resistance to acids and alkalis and is chemically stable .

The ceramic fibers applicable to the present invention can be products with a thickness of 12.5t, 25t, and 50t, among which 25t is mostly used, but considering the convenience of operation and conditions such as construction environment or product specifications, it is preferable to use ceramics of various thicknesses elastically. fiber. Of course, the technical idea of the present invention does not limit the heat insulating material 200 to be ceramic fibers, and various other types of heat insulating materials 200 can be used according to circumstances.

On the other hand, when describing the structure of the heat-resistant bus duct 1000 of the present invention, according to the use position and function of the heat insulating material 200, the heat insulating material 200 is divided into a first heat insulating material 210, a second heat insulating material The heat insulator 220, the third heat insulator 230, and the fourth heat insulator 240 have been described. Since it is not necessary to use different materials, the following will describe the case where one heat insulator 200 is used as an example, and will not They are collectively referred to as heat insulating materials 200 with distinction.

First, the heat insulating material 200 is cut out with scissors according to the size to be applied. After that, as shown in FIG. 6 to FIG. 8 , in order to block the convective heat transfer using air as the medium, the wing portion 112 of the first outer box 110 is filled with the heat insulating material 200 .

Two layers of heat insulating material 200 having a thickness of 25t are inserted into the space of the wing portion 112 finely and without gaps. At this time, as shown in FIG. 7 , it is preferable to leave a space A in which the heat insulating material 200 is not inserted in a partial region of the end for connection of the connection portion 150 (see FIG. 26 ) later.

After inserting the heat insulating material 200 in the space of the wing 112, as shown in FIGS. The heat insulating material 200 is inserted in regions other than the portion where the tape 120 and the tape 130 are fixed.

That is, other parts of the first outer box 110 other than the part supported by the supporting member 120 are wrapped with the heat insulating material 200 . At this time, it is preferable to carry out the work after marking in advance in consideration of the distance between the support members 120 .

In order to fix the heat insulating material 200, the mica tape 202, iron wire, etc. may be used for fixing, or the mica tape 202 and iron wire may be used for fixing.

At this time, as shown in FIG. 9 , it is preferable to leave a margin A not to wrap the heat insulating material 200 in a partial region of the end for the subsequent connection of the connecting portion 150 (see FIG. 26 ).

On the other hand, as shown in FIGS. 12 and 13 , a heat insulating material 200 is inserted into the entire upper surface of the base 103 . The heat insulation treatment of the base 103 can be carried out independently of the heat insulation treatment of the support member 120 described later, or the heat insulation material 200 suitable for use between the support member 120 and the base 103 can be extended to the upper surface of the base 103 in a holistic manner.

After that, as shown in FIGS. 14 to 17 , support members 120 are placed on the base 103 at predetermined intervals, and the support members 120 are subjected to heat insulation treatment in order to block conduction heat transfer through the support members 120 .

The heat insulation treatment of the support member 120 is performed by inserting a heat insulating material 200 at least one of between the support member 120 and the first outer box 110 or between the support member 120 and the base 103 way.

As described above, the heat insulating material 200 arranged between the support member 120 and the base 103 may extend to the entire upper surface of the base 103 . Of course, heat insulation treatment may be performed separately between the support member 120 and the base 103 , and a heat insulating material 200 may be additionally provided on the entire upper surface of the base 103 .

At this time, the heat insulating material 200 may further wrap the main body of the supporting member 120 . That is, as shown in FIG. 16 , additional heat insulation treatment may be performed so that the torso of the support member 120 is wrapped with the heat insulating material 200 .

After the support member 120 is heat-insulated, the support member 120 and the base 103 are bolted together. At this time, when the bus duct 1000 is exposed to flame conditions at 1000°C for more than 90 minutes, it will inevitably be accompanied by thermal expansion of the first outer box 110 or the base 103. Damage or deformation of the bus duct 1000.

Therefore, as shown in 17, it is preferable that the supporting member coupling hole 122 for the bolting of the supporting member 120 has a slit-shaped structure to absorb thermal expansion and contraction. Wherein, the support member coupling hole 122 may be formed to have a length of about 30 mm, and by using such a slit-shaped coupling hole, thermal expansion that may occur under environmental conditions above 1000° C. can be absorbed, thereby preventing structural deformation caused by deformation in advance. sex damage.

After the heat insulation treatment and setting of the support member 120 are completed, the first outer box 110 is placed on the upper side of the support member 120, and the fixing strap 130 is bolted to the support member 120 to fix the second outer box 110. 110 of an outer box. At this time, as described above, as shown in FIGS. 18 and 19 , a heat insulating material 200 for blocking conduction heat transfer is inserted between the supporting member 120 and the first outer case 110 .

In addition, as shown in FIGS. 20 to 22 , the portion where the fixing tape 130 is provided is wrapped with a heat insulating material 200 to perform additional heat insulation treatment on the portion of the first outer box 110 that is exposed to the outside.

During this process, install the heat insulating material 200 in an overlapping manner as far as possible, so as to avoid gaps between the positions where the heat insulating material 200 is already installed, and insert the heat insulating material into the gap between the heat insulating materials 200 if necessary. 200 pieces to minimize heat intrusion.

After wrapping the heat insulating material 200, use the aforementioned mica tape 202 or iron wire to bind and fix it to prevent it from loosening.

After heat insulating the exposed part of the fixing tape 130 in this way, as shown in Figure 23 and Figure 24, insert the heat insulating material 200 again to reduce the number of the first outer box 110 and the second outer box 140 as much as possible. Then cover the second outer box 140 so that the first outer box 110 is accommodated in the internal space formed between the base 101 and the second outer box 140 .

In addition, as shown in FIG. 25 and FIG. 26 , the adjacent fire-resistant busway 1000 is connected through the connection part 150 , and then the heat insulating material 200 is inserted outside the connection part 150 to complete the construction of the fire-resistant busway 1000 . Among them, the heat insulating material 200 inserted outside the connecting portion 150 corresponds to the fourth heat insulating material 240 .

Fig. 27 is a schematic diagram showing the internal temperature distribution of the fire-resistant busway in a fire test according to an embodiment of the present invention.

As shown in Figure 27, since the refractory busway 1000 of the present invention is applied with heat insulation treatment of convection and conduction, even if it is placed under the flame condition of 1000°C for more than 90 minutes, the internal temperature is maintained below 100°C, thus, Not only the first outer case 110 including the bus bar 101 but also the connecting portion 150 having a heat-resistant characteristic of about 150° C. can fully exhibit the heat-resistant performance.

The heat-resistant bus duct and its construction method of the present invention described above can meet the strengthened fire resistance standard by improving the fire resistance of the bus duct, and can prevent the short circuit phenomenon caused by the heat accumulation at the connection part of the bus duct due to convective heat transfer , and can prevent the bus duct from being twisted due to expansion and contraction caused by thermal deformation. In addition, in the event of a fire, stability and reliability are ensured due to sufficient time for normal functioning.

The embodiments of the present invention have been described with reference to the above, but those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the present invention described in the following claims. Therefore, when the modified embodiment includes the constituent elements of the present invention, it should be understood that they are all included in the technical scope of the present invention.

Claims (13)

1. A fire-resistant bus duct, characterized in that it comprises: The first outer box is provided with a busbar inside, and has wings extending laterally on the upper surface and the lower surface in order to strengthen the strength; The first heat insulating material is filled between the wings of the upper surface and the lower surface, and is used to block convective heat transfer using air as a medium. 2. The refractory bus duct according to claim 1, further comprising: a support member provided on the base at regular intervals for supporting the first outer box at a prescribed height; The fixing strap is used to fix the first outer box on the supporting member. 3. The refractory bus duct according to claim 2, characterized in that, It further includes a second heat insulating material, the second heat insulating material is arranged at least one of between the support member and the first outer box or between the support member and the base, and is used to prevent Conductive heat transfer through the support member is interrupted. 4. The refractory bus duct according to claim 3, characterized in that: The second heat insulating material further wraps the main body of the supporting member. 5. The refractory bus duct according to claim 3, characterized in that, A heat insulating material is provided on the entire upper surface of the base for heat insulating treatment. 6. The refractory bus duct according to claim 3, further comprising: a second outer case arranged on the upper side of the base so as to surround the outer side of the first outer case; The third heat insulating material is filled in the space between the first outer box, the second outer box and the base, and is used for blocking convective heat transfer. 7. The refractory bus duct according to claim 6, characterized in that, It further includes a fourth heat insulating material, and the fourth heat insulating material wraps the outer side of the connection part for connecting adjacent bus ducts. 8. The refractory bus duct according to claim 2, characterized in that, A coupling hole for bolt coupling formed in the supporting member is formed in a slit shape. 9. A construction method for a refractory bus duct, characterized in that it comprises: The step of cutting the insulation material according to the size to be set; In order to block the convective heat transfer using air as the medium, the step of filling the heat insulating material in the wings of the first outer box; a step of arranging support members at regular intervals on the base, and after placing the first outer box on the upper side of the support member, combining the fixing tape to fix the step of setting the first outer box; and A step of arranging the second outer box outside the first outer box. 10. The refractory bus duct according to claim 9, further comprising: In order to interrupt conductive heat transfer via the support member, the step of thermally insulating the support member. 11. The refractory bus duct according to claim 10, characterized in that: The heat insulating material further wraps the main body of the supporting member. 12. The refractory bus duct according to claim 10, characterized in that: The heat insulating material arranged between the support member and the base is extended to the entire upper surface of the base, or a heat insulating material is further inserted into the entire upper surface of the base to perform heat insulating treatment. . 13. The refractory bus duct according to claim 9, further comprising: After the adjacent bus ducts are connected to the connection part, a heat insulating material is inserted outside the connection part.