Cable fire resistance testing device under building fire hazard heating condition

Abstract

The invention relates to the technical field of cable fire resistance test equipment under a building fire heating condition, in particular to a cable fire resistance test device under a building fire heating condition, which comprises a test box, a line detection system, a combustion system fixedly connected with the test box, a temperature detection system and a smoke collection system, the test box is provided with a combustion test cavity capable of being opened and closed, the smoke collection system is provided with a rotating platform fixed at the cable through groove in a rotating mode, a smoke collection module is fixed on the rotating platform, and a supporting channel penetrating through the smoke collection module in the length direction of the test box is formed in the smoke collection module. According to the invention, through cooperation of the test box, the combustion system, the temperature detection system and the line detection system, a cable fire resistance test under a building fire hazard heating condition is realized, and through addition of the smoke collection system, waste gas escaping from a cable through groove can be absorbed through negative pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of test equipment for the fire resistance performance of cables under the condition of building fire temperature rise, and particularly to a test device for the fire resistance performance of cables under the condition of building fire temperature rise. Background Art

[0002] The test for the fire resistance performance of cables under the condition of building fire temperature rise is to test the fire resistance performance of cables under the condition of building fire temperature rise, and it is a key experiment to evaluate their ability to maintain power transmission in a fire.

[0003] Currently, for the test equipment for the fire resistance performance of cables under the condition of building fire temperature rise, the test is usually carried out by using a combustion furnace in cooperation with a line detection system. The combustion furnace adopts an open structure, and both ends of the cable sample are electrically connected to the line detection system. Although this test equipment can be used, due to the open structure, the exhaust gas generated during the cable combustion test is likely to escape from the open structure, polluting the experimental environment and causing harm to the test equipment and operators. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a test device for the fire resistance performance of cables under the condition of building fire temperature rise, so as to solve the problem that the exhaust gas generated during the cable combustion test is likely to escape from the open structure of the combustion furnace, polluting the experimental environment.

[0005] Based on the above purpose, the present invention provides a test device for the fire resistance performance of cables under the condition of building fire temperature rise, including a test chamber, a line detection system, a combustion system fixedly connected to the test chamber, a temperature detection system, and a smoke collection system. The test chamber has a combustion test chamber that can be opened and closed. A test bridge for placing a cable sample is fixed in the combustion test chamber. A cable through groove penetrating the test chamber is provided in the length direction of the test chamber in the combustion test chamber. The combustion system has a number of combustion ends penetrating into the combustion test chamber and is used to provide a test heat source. The temperature detection system has a number of test ends penetrating into the combustion test chamber and is used to detect the temperature in the combustion test chamber. The line detection system is used to test the performance of the tested cable sample to maintain line integrity under a temperature rise curve. The smoke collection system has a rotating platform fixedly arranged at the cable through groove in a rotating manner. A smoke collection module is fixed on the rotating platform. A support channel penetrating the smoke collection module in the length direction of the test chamber is provided in the smoke collection module. The end of the cable sample passes through the cable through groove and the support channel and is electrically connected to the line detection system. A smoke collection flow channel is provided in the smoke collection module. The smoke collection flow channel has a smoke outlet extending out of the smoke collection module and a smoke inlet arranged at the end of the support channel.

[0006] In an alternative example, the smoke collection system includes a smoke collection base fixedly connected to the test chamber. The rotating platform is connected to the smoke collection base in a rotatable manner. A smoke collection telescopic cylinder is installed on the rotating platform in a rotatable manner. The end of the smoke collection telescopic cylinder is fixedly connected to the test chamber in a rotatable manner, enabling the rotating platform to rotate along the width direction of the test chamber.

[0007] In an alternative example, the smoke collection module includes a smoke collection housing fixedly connected to the rotating platform. A smoke diversion chamber and an installation chamber extending along the length direction of the test chamber and penetrating the smoke collection housing are provided inside the smoke collection housing. A fire-resistant support block is fixed in the installation chamber. The support channel penetrates the fire-resistant support block along the length direction of the test chamber. Smoke diversion grooves are formed at the ends of the fire-resistant support block along the length direction of the test chamber. The smoke outlet is opened at the top of the smoke collection housing. The smoke diversion grooves, the smoke diversion chamber, and the smoke outlet form a smoke collection flow path and are connected to the support channel.

[0008] In an alternative example, a cooling flow path communicating with the outside is provided in the smoke diversion chamber.

[0009] In an alternative example, the smoke collection housing includes an upper housing and a lower housing fixedly connected to each other. The smoke diversion chamber is provided inside the upper housing. The lower housing is provided inside the lower housing. An upper through groove is opened at the bottom of the upper housing. A lower through groove connected to the upper through groove is opened at the top of the lower housing.

[0010] In an alternative example, the upper housing includes a top plate and a bottom plate. Two groups of long side side plates and two groups of short side side plates are fixed between the top plate and the bottom plate. The smoke outlet is provided above the top plate. A long side flow path is opened in the long side side plate. A short side flow path is opened in the short side side plate. A bottom flow path is opened in the bottom plate. A top flow path is opened in the top plate. The top flow path, the long side flow path, the short side flow path, and the bottom flow path are connected and form a cooling flow path.

[0011] In an alternative example, the top plate includes an upper plate body, a plurality of groups of upper connectors fixed to the lower end of the upper plate body, and an upper bracket detachably connected through the upper connectors. A bracket flow path is opened in the upper bracket. A connection flow path one is provided in the upper connector. The connection flow path one is connected to the bracket flow path and the short side flow path.

[0012] In an optional example, a downwardly extending connecting guide column is fixed on the upper connector, a guide column channel connected to a connecting channel is provided in the connecting guide column, a connecting hole connected to the guide column channel is provided on the outer wall of the connecting guide column, a locking nut is fixed to the outer wall of the connecting guide column by a threaded connection, an abutment boss is provided on the outer wall of the connecting guide column, the upper end of the locking nut abuts against the lower end of the connecting bracket, so that the upper end of the connecting bracket is abutted and fixed to the abutment boss.

[0013] In an optional example, a lower connector is fixed to the upper end of the base plate, and a connecting channel 2 is provided in the lower connector, one end of the connecting channel 2 is connected to the short side channel, and the other end of the connecting channel 2 is connected to the bottom channel.

[0014] In an optional example, the short side panel includes a first short side panel and a second short side panel which are connected to each other, the first short side panel is located close to the direction of the smoke guide cavity, and a short side panel groove is provided at one end of the first short side panel facing away from the direction of the smoke guide cavity, and a short side panel hole and a short side panel through groove which penetrate the first short side panel are provided in the short side panel groove, a side duct is inserted and fixed in the short side panel hole by riveting, and a side through hole which is connected to the inner cavity of the side duct is provided on the outer wall of the side duct, and the side through hole is connected to the short side panel groove.

[0015] The beneficial effect of the present invention is that through the cooperation of the test box, the combustion system, the temperature detection system and the line detection system, the fire resistance performance test of the cable under the temperature rise condition of the building fire is realized, the temperature curve of the test can be effectively controlled, and the test accuracy of the test is guaranteed. At the same time, through the added smoke collection system, the exhaust gas escaping from the cable trough can be absorbed by negative pressure, the pollution of the exhaust gas to the test environment is reduced, and the operators and test equipment are protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the explosion structure of an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the three-dimensional structure of the smoke collection module in an embodiment of the present invention;

[0020] Figure 4 Schematic explosion structure diagram of the smoke collection module in the embodiment of the present invention;

[0021] Figure 5 Schematic explosion structure diagram of the smoke collection outer shell in the embodiment of the present invention;

[0022] Figure 6 Schematic explosion structure diagram of the upper outer shell in the embodiment of the present invention;

[0023] Figure 7 Schematic explosion structure diagram of the top plate in the embodiment of the present invention Figure 1 ;

[0024] Figure 8 Schematic explosion structure diagram of the top plate in the embodiment of the present invention Figure 2 ;

[0025] Figure 9 Schematic explosion structure diagram of the connecting guide post in the embodiment of the present invention;

[0026] Figure 10 Schematic explosion structure diagram of the bottom plate in the embodiment of the present invention;

[0027] Figure 11 Schematic explosion structure diagram of the short side plate groove in the embodiment of the present invention Figure 1 ;

[0028] Figure 12 Schematic explosion structure diagram of the short side plate groove in the embodiment of the present invention Figure 2 ;

[0029] Figure 13 Schematic three-dimensional structure diagram of the side duct in the embodiment of the present invention;

[0030] Figure 14 Schematic explosion structure diagram of the long side side plate in the embodiment of the present invention Figure 1 ;

[0031] Figure 15 Schematic explosion structure diagram of the long side side plate in the embodiment of the present invention Figure 2 。

[0032] The markings in the figure are: 1. test chamber; 101. combustion test chamber; 102. cable through groove; 103. box body; 104. cover plate; 2. combustion system; 3. smoke collection system; 31. rotating platform; 32. smoke collection base; 33. smoke collection telescopic cylinder; 4. test bridge; 5. temperature detection system; 6. smoke collection module; 61. smoke collection flow channel; 62. support channel; 63. smoke collection outer shell; 64. smoke diversion chamber; 65. installation chamber; 66. fire-resistant support block; 661. smoke diversion groove; 67. cooling flow channel; 7. upper outer shell; 701. upper through groove; 71. top plate; 7101. top flow channel; 711. upper plate body; 712. upper connector; 7121. connection flow channel one; 7122. first upper contact end face; 7123. second upper contact end face; 7124. connector hole one; 7125. connection guide post; 71251. contact boss; 7126. guide post flow channel; 7127. connection hole; 7128. locking nut; 713. upper bracket; 71301. bracket flow channel; 7131. first bracket; 71311. vertical through groove; 71312. bending part; 71313. first support hole; 7132. second bracket; 71321. bracket groove; 71322. second support hole; 72. bottom plate; 7201. bottom flow channel; 721. first bottom plate body; 7211. bottom groove; 722. second bottom plate body; 73. long side side plate; 7301. long side flow channel; 731. first long side side plate; 7311. long side side plate groove; 7312. long through groove; 732. second long side side plate; 74. short side side plate; 7401. short side flow channel; 741. first short side side plate; 7411. short side side plate groove; 7412. short side side plate hole; 7413. short side side plate through groove; 742. second short side side plate; 743. side conduit; 7431. side through hole; 75. lower connector; 751. connection flow channel two; 752. first lower contact end face; 753. second lower contact end face; 754. bottom through hole; 76. middle connector; 761. connection flow channel three; 762. first middle contact end face; 763. second middle contact end face; 8. lower outer shell; 801. lower through groove. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0034] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. After the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] In one embodiment, please refer to Figures 1 to 2 As shown, the test device for the fire-resistant performance of cables under the condition of rising temperature in building fires provided by the present invention includes a test chamber 1, a line detection system, a combustion system 2 fixedly connected to the test chamber 1, a temperature detection system 5, and a smoke collection system 3.

[0036] The test chamber 1 has a combustion test chamber 101 that can be opened and closed. A test bridge 4 for placing cable samples is fixedly installed in the combustion test chamber 101. A cable through groove 102 penetrating the test chamber 1 is provided in the combustion test chamber 101 along the length direction of the test chamber 1. Among them, the test chamber 1 includes a box body 103 and a cover plate 104. The combustion test chamber 101 is in an open shape and is arranged in the box body 103. The top of the cover plate 104 is provided with lifting lugs extending upward and is used to seal the combustion test chamber 101; the combustion test chamber 101 is filled with a heat insulation layer, and the heat insulation layer can be made of materials such as calcium silicate wool; a maintenance platform is additionally provided outside the box body 103; the cable samples are placed in the test bridge 4, and the ends of the cable samples pass through the outside of the cable through groove 102.

[0037] The combustion system 2 has a number of combustion ends penetrating into the combustion test chamber 101 and is used to provide a test heat source. Among them, the combustion system 2 is connected to an external gas supply device, and the external gas supply device is used to provide a combustible mixed gas; there can be multiple combustion ends, preferably 8 combustion ends, which are installed on the side wall of the test chamber 1 in a symmetric manner, which can not only ensure the temperature in the combustion test chamber 101 but also reduce the manufacturing cost; the combustion end can adopt a burner, and the burner is equipped with an ion ignition monitor and an automatic flame extinguishing alarm device to control the concentration of combustible gas in the furnace to reach the critical value or when not ignited, automatically cut off the gas.

[0038] The temperature detection system 5 has several test ends penetrating into the combustion test chamber 101 and is used to detect the temperature inside the combustion test chamber 101. Among them, the test ends use thermocouples, such as nickel-chromium, nickel-silicon (K-type) thermocouples. Their outer covers use heat-resistant stainless steel pipes or heat-resistant porcelain sleeves, filled with heat-resistant materials in the middle, and their hot ends extend out of the sleeves. There can be multiple thermocouples, preferably 8, and they are installed on the side wall of the test chamber 1 in an asymmetric manner, capable of displaying a reliable average temperature near the specimen, and there is a certain interval between the position of the thermocouple and the flame of the burner.

[0039] The line detection system is used to test the performance of the tested cable sample to maintain line integrity under the heating curve. Among them, the line detection system is electrically connected to the ends of the cable sample, and during the test, it can continuously test the cable sample.

[0040] The smoke collection system 3 has a rotating platform 31 fixed at the cable channel 102 in a rotating manner. A smoke collection module 6 is fixed on the rotating platform 31 by means of bolt connection. A support channel 62 running through the smoke collection module 6 in the length direction of the test chamber 1 is opened in the smoke collection module 6. The end of the cable sample passes through the cable channel 102 and the support channel 62 and is electrically connected to the line detection system. A smoke collection flow channel 61 is opened in the smoke collection module 6. The smoke collection flow channel 61 has a smoke outlet extending out of the smoke collection module 6 and a smoke inlet provided at the end of the support channel 62. Among them, the smoke outlet is connected to an external negative pressure device. The waste gas generated by combustion flows into the smoke collection flow channel 61 through the smoke inlet, and then flows into the negative pressure device through the smoke outlet and is discharged. The rotating platform 31 can drive the smoke collection module 6 to rotate, avoiding interfering with the hoisting of the cable sample.

[0041] Specifically, through the cooperation of the test chamber 1, the combustion system 2, the temperature detection system 5 and the line detection system in this example, the test of the fire resistance performance of the cable under the heating conditions of a building fire is realized. It can effectively control the temperature curve of the test, ensure the test accuracy, and at the same time, through the added smoke collection system 3, it can absorb the waste gas escaping from the cable channel 102 through negative pressure, reduce the pollution of the waste gas to the test environment, and protect the operators and test equipment.

[0042] In an alternative example, please refer to Figures 1 to 3 As shown, the smoke collection system 3 includes a smoke collection base 32 fixedly connected to the test chamber 1 by means of bolt connection. The rotating platform 31 is connected to the smoke collection base 32 by means of a rotating shaft connection. A smoke collection telescopic cylinder 33 is installed on the rotating platform 31 by means of a rotating shaft connection. The end of the smoke collection telescopic cylinder 33 is fixedly connected to the test chamber 1 by means of a rotating shaft connection, enabling the rotating platform 31 to rotate along the width direction of the test chamber 1.

[0043] Specifically, in this example, the smoke collection telescopic cylinder 33 works to drive the rotation of the rotary platform 31 by the telescopic end of the smoke collection telescopic cylinder 33. The rotary platform 31 drives the rotation of the smoke collection module 6, enabling the smoke collection module 6 to switch between the vertical and horizontal directions, avoiding interference with the hoisting of cables.

[0044] In an alternative example, please refer to Figures 1 to 4 As shown, the smoke collection module 6 includes a smoke collection outer shell 63 fixedly connected to the rotary platform 31 by means of bolt connection. A smoke diversion cavity 64 and an installation cavity 65 penetrating the smoke collection outer shell 63 along the length direction of the test chamber 1 are provided inside the smoke collection outer shell 63. A fire-resistant support block 66 is inserted and fixed in the installation cavity 65. The support channel 62 penetrates the fire-resistant support block 66 along the length direction of the test chamber 1. A smoke diversion groove 661 is provided at the end of the fire-resistant support block 66 along the length direction of the test chamber 1. The smoke outlet is opened at the top of the smoke collection outer shell 63. The smoke diversion groove 661, the smoke diversion cavity 64 and the smoke outlet form a smoke collection flow path 61 and are connected to the support channel 62. Among them, the fire-resistant support block 66 can be made of fire-resistant materials, such as fire bricks, etc.; the smoke outlet is connected to an external negative pressure device through a pipeline.

[0045] Specifically, in this example, the fire-resistant support block 66 supports the cable sample, avoiding the direct transfer of the cable heat to the smoke collection module 6, improving the service life of the smoke collection module 6, facilitating the maintenance of the smoke collection module 6, and at the same time, by opening the smoke diversion groove 661 at the end of the fire-resistant support block 66, the escape of waste gas can be effectively reduced, further reducing the pollution of the test environment by waste gas.

[0046] In an alternative example, please refer to Figures 1 to 4 As shown, a cooling flow path 67 communicating with the outside is provided in the smoke diversion cavity 64. Among them, the cooling flow path 67 is connected to an external cooling device, and the cooling device is used to provide coolant.

[0047] Specifically, in this example, by providing the cooling flow path 67 in the smoke diversion cavity 64, the temperature in the smoke diversion cavity 64 can be effectively reduced, protecting the pipeline structures such as the smoke collection flow path 61, avoiding the deformation of the pipeline structures such as the smoke collection module 6 caused by high temperature, and improving the service life of the smoke collection module 6.

[0048] In an alternative example, please refer to Figures 1 to 5 As shown, the smoke collection outer shell 63 includes an upper outer shell 7 and a lower outer shell 8 fixedly connected to each other by means of bolt connection. The smoke diversion cavity 64 is provided in the upper outer shell 7, and the lower part is provided in the lower outer shell 8. An upper through groove 701 is opened at the bottom of the upper outer shell 7, and a lower through groove 801 connected to the upper through groove 701 is opened at the top of the lower outer shell 8. Among them, the waste gas flows into the smoke diversion cavity 64 through the lower through groove 801 and the upper through groove 701.

[0049] Specifically, in this example, by splitting the smoke collecting housing 63 into an upper housing 7 and a lower housing 8, the manufacturing difficulty of the smoke collecting housing 63 is effectively reduced, and at the same time, it is convenient for the operator to clean the smoke diversion cavity 64 in the upper housing 7, avoiding the attachment of particulate matter in the smoke diversion cavity 64 during the combustion process, reducing the cooling effect of the smoke diversion cavity 64, and causing damage to the connecting pipeline.

[0050] In an alternative example, refer to Figures 1 to 6 As shown, the upper housing 7 includes a top plate 71 and a bottom plate 72. Between the top plate 71 and the bottom plate 72, two groups of long side side plates 73 and two groups of short side side plates 74 are fixed by means of bolt connection. The smoke outlet 631 is arranged above the top plate 71. A long side flow channel 7301 is provided in the long side side plate 73, a short side flow channel 7401 is provided in the short side side plate 74, a bottom flow channel 7201 is provided in the bottom plate 72, and a top flow channel 7101 is provided in the top plate 71. The top flow channel 7101, the long side flow channel 7301, the short side flow channel 7401 and the bottom flow channel 7201 are connected and combined to form a cooling flow channel 67.

[0051] Specifically, in this example, by splitting the upper housing 7 into a top plate 71, a bottom plate 72, long side side plates 73 and short side side plates 74, the disassembly and assembly difficulty of the upper housing 7 is effectively reduced, facilitating the maintenance and cleaning of the upper housing 7. At the same time, the added top flow channel 7101, long side flow channel 7301, short side flow channel 7401 and bottom flow channel 7201 further reduce the temperature of the upper housing 7 and improve the service life of the upper housing 7.

[0052] In an alternative example, refer to Figures X to XAs shown in the figure, the top plate 71 includes an upper plate body 711, several groups of upper connectors 712 fixedly connected to the lower end of the upper plate body 711 by riveting, and an upper bracket 713 detachably connected to the upper connectors 712. A bracket flow channel 71301 is provided in the upper bracket 713, and a first connecting flow channel 7121 is provided in the upper connector 712. The first connecting flow channel 7121 is communicated with the bracket flow channel 71301 and the short-side flow channel 7401. Among them, the upper bracket 713 includes a first bracket 7131 and a second bracket 7132 fixedly connected to each other by welding. The first bracket 7131 is located on the side closer to the smoke diversion cavity 64, and the second bracket 7132 is located on the side away from the smoke diversion cavity 64. A vertical through groove 71311 penetrating through the first bracket 7131 is provided on the first bracket 7131, and a bent portion 71312 extending downward is provided at the vertical through groove 71311. One end of the second bracket 7132 facing the first bracket 7131 is provided with a bracket groove 71321. The bracket groove 71321 is in close contact and sealed with one side wall of the first bracket 7131, and they are combined to form the bracket flow channel 71301. A second through hole 71322 penetrating through the second bracket 7132 is provided in the bracket groove 71321, and a first through hole 71313 matching the second through hole 71322 is provided on the first bracket 7131.

[0053] Specifically, in this example, by increasing the bracket flow channel 71301, the contact area between the coolant and the exhaust gas is increased, the cooling effect of the top plate 71 on the exhaust gas is improved, the structures such as pipelines are protected, and at the same time, the bent portion 71312 is used to further increase the contact area between the upper bracket 713 and the exhaust gas, thereby improving the cooling efficiency of the exhaust gas.

[0054] In an alternative example, please refer to Figures 1 to 9As shown, the upper connector 712 is L-shaped. The upper connector 712 has a first upper abutting end face 7122 and a second upper abutting end face 7123. The first upper abutting end face 7122 abuts against the top plate 71, and the second upper abutting end face 7123 abuts against the short-side side plate 74. A first connecting flow channel 7121 is provided with a first connector hole 7124 penetrating through the upper connector 712. A downwardly extending connecting guide post 7125 is fixed in the first connector hole 7124 by riveting. A guide post flow channel 7126 communicating with the first connecting flow channel 7121 is provided in the connecting guide post 7125. A connecting hole 7127 communicating with the guide post flow channel 7126 is provided on the outer wall of the connecting guide post 7125. A locking nut 7128 is fixed on the outer wall of the connecting guide post 7125 by threaded connection. A abutting boss 71251 is provided on the outer wall of the connecting guide post 7125. The upper end of the locking nut 7128 abuts against the lower end of the connecting bracket, so that the upper end of the connecting bracket abuts and is fixed against the abutting boss 71251. Among them, the connecting guide post 7125 passes through the first support hole 71313 and the second support hole 71322, and the connecting hole 7127 is located in the support groove 71321; one end of the first connecting flow channel 7121 extends to the first upper abutting end face 7122, and the other end of the first connecting flow channel 7121 extends to the second upper abutting end face 7123.

[0055] Specifically, in this example, through the cooperation of the connecting guide post 7125 and the locking nut 7128, the quick disassembly and assembly of the upper bracket 713 are realized, the disassembly and assembly difficulty of the upper bracket 713 is reduced, the cleaning time of the upper bracket 713 is saved, and the cooling effect of the upper bracket 713 is ensured.

[0056] In an alternative example, please refer to Figures 1 to 10As shown in the figure, a lower connector 75 is fixed to the upper end of the bottom plate 72 by means of bolt connection. A second connecting flow channel 751 is provided in the lower connector 75. One end of the second connecting flow channel 751 is communicated with the short-side flow channel 7401, and the other end of the second connecting flow channel 751 is communicated with the bottom flow channel 7201. Among them, the lower connector 75 is L-shaped. The lower connector 75 has a first lower abutting end face 752 and a second lower abutting end face 753. The first lower abutting end face 752 abuts against the bottom plate 72, and the second lower abutting end face 753 abuts against the short-side side plate 74. One end of the second connecting flow channel 751 is communicated with the first lower abutting end face 752, and the other end of the second connecting flow channel 751 abuts against the second lower abutting end face 753. The bottom plate 72 includes a first bottom plate body 721 and a second bottom plate body 722. The first bottom plate body 721 is located on the side close to the smoke diversion cavity 64, and the second bottom plate body 722 is located on the side away from the smoke diversion cavity 64. The first bottom plate body 721 is provided with a bottom groove 7211 facing the second bottom plate body 722. The bottom groove 7211 abuts against the second bottom plate body 722 and combines to form the second connecting flow channel 751. A bottom through hole 754 penetrating the first bottom plate body 721 is provided in the second connecting flow channel 751, and the bottom through hole 754 is communicated with the second connecting flow channel 751.

[0057] Specifically, in this example, the short-side flow channel 7401 and the bottom flow channel 7201 are connected through the lower connector 75, which facilitates the flow of the coolant, realizes the quick disassembly and assembly of the bottom plate 72 and the short-side side plate 74, reduces the disassembly and assembly difficulty of the bottom plate 72, saves the cleaning time of the bottom plate 72, and ensures the cooling effect of the bottom plate 72.

[0058] In an alternative example, please refer to Figures 1 to 15 As shown in the figure, the short-side side plate 74 includes a first short side plate 741 and a second short side plate 742 that are fixedly connected to each other by welding. The first short side plate 741 is arranged in the direction close to the smoke diversion cavity 64. A short side plate groove 7411 is provided at one end of the first short side plate 741 facing away from the smoke diversion cavity 64. A short side plate hole 7412 and a short side plate through groove 7413 penetrating the first short side plate 741 are provided in the short side plate groove 7411. A side conduit 743 is inserted and fixed in the short side plate hole 7412 by riveting. A side through hole 7431 communicated with its inner cavity is provided on the outer wall of the side conduit 743, and the side through hole 7431 is communicated with the short side plate groove 7411. Among them, the side conduit 743 is connected to an external cooling device by means of a hose connection, and the cooling device is used to provide coolant.

[0059] Specifically, this example reduces the manufacturing difficulty and production cost of the short side panel 74 by splitting the short side panel 74 into a first short side panel 741 and a second short side panel 742, and the first short side panel 741 and the second short side panel 742 can be integrally formed by stamping, further reducing the manufacturing cost of the short side panel 74.

[0060] A middle connector 76 is fixed between the short side plate 74 and the long side plate 73 by bolt connection, and a connection channel 3 761 is provided in the middle connector 76, one end of the connection channel 3 761 is connected to the long side channel 7301, and the other end of the connection channel 3 761 is connected to the short side channel 7401. The middle connector 76 is L-shaped, and has a first middle contact end face 762 and a second middle contact end face 763, the first middle contact end face 762 contacts the long side plate 73, and the second middle contact end face 763 contacts the short side plate 74, one end of the connection channel 3 761 extends to the first middle contact end face 762, and the other end of the connection channel 3 761 extends to the second middle contact end face 763.

[0061] Specifically, in this example, the long side flow channel 7301 and the short side flow channel 7401 are connected through the middle connector 76 , which facilitates the disassembly and assembly of the smoke collection module 6 and improves the maintenance efficiency of the smoke collection module 6 .

[0062] The long side plate 73 includes a first long side plate 731 and a second long side plate 732 which are fixedly connected to each other by welding. The first long side plate 731 is located near the smoke guide cavity 64. A long side plate groove 7311 is provided at one end of the first long side plate 731 toward the second long side plate 732. Two groups of long through grooves 7312 that penetrate the first long side plate 731 are provided in the long side plate groove 7311. The connecting flow channels three 761 corresponding to the long through grooves 7312 are connected.

[0063] Specifically, this example reduces the manufacturing difficulty and production cost of the long side panel 73 by splitting the long side panel 73 into a first long side panel 731 and a second long side panel 732, and the first long side panel 731 and the second long side panel 732 can be integrally formed by stamping, further reducing the manufacturing cost of the short side panel 74.

[0064] Generally speaking, through the cooperation of the test chamber 1, the combustion system 2, the temperature detection system 5 and the line detection system, the present invention realizes the test of the fire resistance performance of cables under the temperature rise conditions of building fires, can effectively control the temperature curve of the test, ensures the test accuracy, and at the same time, by adding the smoke collection channel 61, can effectively reduce the escape of waste gas, further reduces the pollution of the test environment by waste gas, and by arranging the cooling channel 67 in the smoke diversion cavity 64, can effectively reduce the temperature in the smoke diversion cavity 64, protect the pipeline structures such as the smoke collection channel 61, avoid the deformation of pipeline structures such as the smoke collection module 6 caused by high temperature, and improve the service life of the smoke collection module 6.

[0065] Those of ordinary skill in the art should understand that: the discussion of any embodiment above is only exemplary, and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0066] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A test device for the fire resistance performance of cables under the condition of temperature rise in a building fire, comprising a test chamber (1), a line detection system, a combustion system (2) fixedly connected to the test chamber (1), a temperature detection system (5), and a smoke collection system (3), characterized in that: The test chamber (1) has a combustible test chamber (101) that can be opened and closed. A test bridge (4) for placing cable samples is fixed in the combustible test chamber (101). A cable through groove (102) penetrating the test chamber (1) is provided along the length direction of the test chamber (1) in the combustible test chamber (101); The combustion system (2) has a number of combustion ends penetrating into the combustible test chamber (101) and is used to provide a test heat source; The temperature detection system (5) has a number of test ends penetrating into the combustible test chamber (101) and is used to detect the temperature in the combustible test chamber (101); The line detection system is used to test the performance of the tested cable sample to maintain line integrity under a temperature rise curve; The smoke collection system (3) has a rotating platform (31) fixedly installed at the cable through groove (102) in a rotating manner. A smoke collection module (6) is fixed on the rotating platform (31). A support channel (62) penetrating the smoke collection module (6) along the length direction of the test chamber (1) is provided in the smoke collection module (6). The end of the cable sample passes through the cable through groove (102) and the support channel (62) and is electrically connected to the line detection system. A smoke collection flow channel (61) is provided in the smoke collection module (6). The smoke collection flow channel (61) has a smoke outlet extending out of the smoke collection module (6) and a smoke inlet provided at the end of the support channel (62).

2. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 1, wherein, The smoke collection system (3) includes a smoke collection base (32) fixedly connected to the test chamber (1). The rotating platform (31) is connected to the smoke collection base (32) in a rotatable connection manner. A smoke collection telescopic cylinder (33) is installed on the rotating platform (31) in a rotating manner. The end of the smoke collection telescopic cylinder (33) is fixedly connected to the test chamber (1) in a rotating manner, so that the rotating platform (31) can rotate along the width direction of the test chamber (1).

3. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 2, wherein, The smoke collection module (6) includes a smoke collection outer shell (63) fixedly connected to the rotating platform (31). A smoke diversion chamber (64) and an installation chamber (65) penetrating the smoke collection outer shell (63) along the length direction of the test chamber (1) are provided in the smoke collection outer shell (63). A fire-resistant support block (66) is fixed in the installation chamber (65). The support channel (62) penetrates the fire-resistant support block (66) along the length direction of the test chamber (1). A smoke diversion groove (661) is provided at the end of the fire-resistant support block (66) along the length direction of the test chamber (1). The smoke outlet is provided at the top of the smoke collection outer shell (63). The smoke diversion groove (661), the smoke diversion chamber (64) and the smoke outlet form a smoke collection flow channel (61) and are communicated with the support channel (62).

4. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 3, characterized in that, A cooling flow channel (67) communicating with the outside is provided in the smoke diversion chamber (64).

5. The cable fire resistance performance test device under the condition of building fire temperature rise according to claim 4, characterized in that, The smoke collecting shell (63) comprises an upper shell (7) and a lower shell (8) which are fixedly connected to each other, the smoke guide cavity (64) is arranged in the upper shell (7), the lower shell (8) is opened in the lower shell (8), the bottom of the upper shell (7) is provided with an upper through groove (701), and the top of the lower shell (8) is provided with a lower through groove (801) connected to the upper through groove (701).

6. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 5, characterized in that, The upper shell (7) comprises a top plate (71) and a bottom plate (72); two groups of long side plates (73) and two groups of short side plates (74) are fixed between the top plate (71) and the bottom plate (72); the smoke outlet is arranged at the upper part of the top plate (71); a long side flow channel (7301) is provided in the long side plate (73); a short side flow channel (7401) is provided in the short side plate (74); a bottom flow channel (7201) is provided in the bottom plate (72); a top flow channel (7101) is provided in the top plate (71); the top flow channel (7101), the long side flow channel (7301), the short side flow channel (7401) and the bottom flow channel (7201) are connected and combined to form a cooling flow channel (67).

7. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 6, characterized in that, The top plate (71) includes an upper plate body (711), a plurality of groups of upper connectors (712) fixed to the lower end of the upper plate body (711), and an upper bracket (713) detachably connected via the upper connector (712), a bracket flow channel (71301) is provided in the upper bracket (713), a connecting flow channel 1 (7121) is provided in the upper connector (712), and the connecting flow channel 1 (7121) is connected to the bracket flow channel (71301) and the short side flow channel (7401).

8. The cable fire resistance performance test device under the building fire temperature rise condition according to claim 7, characterized in that A downwardly extending connecting guide column (7125) is fixed on the upper connector (712); a guide column flow channel (7126) connected to the connecting flow channel 1 (7121) is provided in the connecting guide column (7125); a connecting hole (7127) connected to the guide column flow channel (7126) is provided on the outer wall of the connecting guide column (7125); a locking nut (7128) is fixed to the outer wall of the connecting guide column (7125) by threaded connection; a contact boss (71251) is provided on the outer wall of the connecting guide column (7125); the upper end of the locking nut (7128) contacts the lower end of the connecting bracket, so that the upper end of the connecting bracket contacts and is fixed to the contact boss (71251).

9. The test device for the fire resistance performance of cables under the condition of temperature rise in building fires according to claim 6, characterized in that, A lower connector (75) is fixed to the upper end of the bottom plate (72), and a second connecting channel (751) is provided in the lower connector (75), one end of the second connecting channel (751) is connected to the short side channel (7401), and the other end of the second connecting channel (751) is connected to the bottom channel (7201).

10. The test device for the fire resistance performance of cables under the heating conditions of building fires according to claim 6, characterized in that, The short-side side plate (74) includes a first short side plate (741) and a second short side plate (742) that are connected to each other. The first short side plate (741) is arranged in the direction close to the smoke diversion cavity (64). One end of the first short side plate (741) facing away from the smoke diversion cavity (64) is provided with a short side plate groove (7411). A short side plate hole (7412) and a short side plate through groove (7413) that penetrate the first short side plate (741) are formed in the short side plate groove (7411). A side duct (743) is inserted and fixed in the short side plate hole (7412) by riveting. A side through hole (7431) that communicates with its inner cavity is formed on the outer wall of the side duct (743). The side through hole (7431) communicates with the short side plate groove (7411).

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