CN215179845U - Wire and cable heat release rate testing device - Google Patents

Abstract

The utility model relates to a wire and cable detects technical field, especially relates to a wire and cable heat release rate testing arrangement. Wire and cable heat release rate testing arrangement is including subassembly and the combustion subassembly of discharging fume, combustion subassembly erects subaerial, just combustion subassembly externally mounted air supply subassembly, the utility model provides a wire and cable hot pitot tube differential pressure method replaces hot ball formula anemoscope, solves the fragile problem of anemoscope, no longer need frequently to change the hot ball formula anemoscope of damage, and installs cable or optical cable on perpendicular standard ladder during the experiment, adopts the ignition of specified ignition source to this burning action and the combustion performance of evaluating the cable, can obtain the burning data of cable conflagration initial stage through the experiment, the test through heat release rate reflects the danger that flame stretchs along the cable and the potential influence of ignition source to adjacent region.

Description

Wire and cable heat release rate testing device

Technical Field

The utility model relates to a wire and cable detects technical field, especially relates to a wire and cable heat release rate testing arrangement.

Background

With the development of urbanization construction, more and more electric wires and cables are required to transmit electric power through a bottom line pipeline, and accordingly fire hazards are brought. It is therefore necessary to obtain data on the fire behaviour of the cable at the initial stage of a fire by testing the rate of heat release to reflect the risk of the fire spreading along the cable and the potential impact of the fire on neighbouring areas. More and more cables are required to make the determination of the rate of heat release.

At present, the combustion box of the existing testing device uses the mixed gas of propane and air to perform combustion action on a test wire and a test cable in the combustion box under the condition of introducing clean air with specified flow rate.

The prior testing device has the following defects:

(1) the measuring device in the probe of the adopted hot-ball anemometer is fragile, and the probe can not be repaired if being damaged easily by carelessness in use;

(2) the disadvantages of manual measurement of the flow rate of a pipeline: the manual positioning is inaccurate, so that the position of the anemoscope cannot be accurately positioned, and the inaccuracy of the measurement result is caused.

Therefore, it is necessary to provide a new device for testing heat release rate of wire and cable to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a release rate testing arrangement is released to wire and cable heat.

The utility model provides a release rate testing arrangement is released to wire and cable heat includes:

a smoke evacuation assembly;

the smoke exhaust device comprises a combustion assembly, the combustion assembly is erected on the ground, an air supply assembly is installed outside the combustion assembly, the smoke exhaust assembly comprises a smoke collecting hood support, a smoke collecting hood is connected to the smoke collecting hood support through bolts, a first flow stabilizing pipe section is fixedly installed on the smoke collecting hood and connected with a second flow stabilizing pipe section through a smoke pipe, a smoke exhaust fan is installed on the second flow stabilizing pipe section, a measuring section pipe fitting is arranged in the smoke pipe, the measuring section pipe fitting comprises a bidirectional probe, the bidirectional probe is fixedly installed on a measuring section pipe of the smoke pipe, a KC measurer and a temperature collector are fixedly installed on the measuring section pipe, a sampling pipe is inserted into the measuring section pipe, a smoke density measuring instrument is installed at one end of the sampling pipe, the combustion assembly comprises a combustion testing box, and the combustion testing box is fixedly installed in the smoke collecting hood support, and a style hoisting frame is fixedly installed on the combustion test box, a burner is installed in the combustion assembly, the combustion assembly further comprises a front observation window and a rear observation window, and the front observation window and the rear observation window are respectively and fixedly installed on a rotating door of the front end face of the combustion test box and on the box wall of the rear end face of the combustion test box.

Preferably, the burner is mounted on a moveable trolley structure.

Preferably, the air supply assembly comprises an air supply fan, an air outlet of the air supply fan is communicated with an air supply pipeline through a guide pipe, an air outlet of the air supply pipeline is communicated with an air supply outlet of the combustion test box, and a pitot tube is mounted on the air supply pipeline.

Preferably, an air distribution system is installed on the side wall of the combustion test box.

Preferably, the outer box wall of the combustion test box is provided with a pattern lifting assembly, and the pattern lifting assembly comprises a low-speed winch and a matched pulley system.

Preferably, a screen control system is arranged on a side frame beside a rear observation window of the combustion test box.

Compared with the prior art, the utility model provides a wire and cable heat is released speed testing arrangement has following beneficial effect:

the utility model provides a wire and cable heat release rate testing arrangement, hot ball formula anemoscope through measure section pipe fitting replacement measurement wind speed, solve the fragile problem of anemoscope, the hot ball formula anemoscope of damage no longer needs to frequently change, and install cable or optical cable on perpendicular standard ladder during the experiment, adopt the ignition source of regulation to ignite, with this combustion behavior and the combustion behavior of evaluating the cable, can obtain the burning data of cable conflagration initial stage through the experiment, the test through heat release rate reflects the danger that flame stretchs along the cable and the potential influence of the source of a fire to adjacent region.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of a device for testing a heat release rate of an electric wire;

FIG. 2 is a schematic structural view of the blower assembly shown in FIG. 1;

FIG. 3 is a schematic view of the smoke evacuation assembly shown in FIG. 1;

FIG. 4 is a front view of the pipe fitting in the measuring section shown in FIG. 3;

FIG. 5 is a schematic structural view of the pipe fitting of the measuring section shown in FIG. 3;

FIG. 6 is a schematic structural view of the combustion assembly of FIG. 2;

FIG. 7 is a front view schematic illustration of the combustion assembly of FIG. 6;

FIG. 8 is a schematic view of the structure of the burner of FIG. 7;

fig. 9 is a schematic structural view of the blower assembly shown in fig. 2.

Reference numbers in the figures: 1. a smoke evacuation assembly; 11. a fume collecting hood support; 12. a smoke collecting hood; 13. a first flow stabilizer section; 14. a smoke pipe; 15. measuring a section pipe fitting; 151. a bidirectional probe; 152. a KC measurer; 153. a temperature acquisition instrument; 154. a sampling tube; 155. a smoke density measuring instrument; 16. a second flow stabilizer section; 17. a smoke exhaust fan; 2. a combustion assembly; 21. a combustion test box; 22. a front observation window; 23. a rear observation window; 24. a sample hoisting frame; 25. a burner; 3. an air supply assembly; 31. an air supply fan; 32. an air supply duct; 33. a pitot tube; 4. a gas distribution system; 5. a pattern lifting assembly; 6. and a view screen control system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description is provided for the specific embodiments of the present invention.

Referring to fig. 1 to 9, an embodiment of the present invention provides an electric wire and cable heat release rate testing apparatus, including: a smoke evacuation assembly 1 and a combustion assembly 2.

In the embodiment of the present invention, please refer to fig. 1, fig. 3, fig. 4 and fig. 5, the smoke exhaust assembly 1 includes a smoke collecting hood support 11, the smoke collecting hood 12 is bolted on the smoke collecting hood support 11, and a first flow stabilizing pipe section 13 is fixedly installed on the smoke collecting hood 12, the first flow stabilizing pipe section 13 is connected to a second flow stabilizing pipe section 16 through a smoke pipe 14, a measurement section pipe 15 is installed in the smoke pipe 14, the measurement section pipe 15 includes a bidirectional probe 151, the bidirectional probe 151 is fixedly installed on the measurement section pipe of the smoke pipe 14, a KC measurer 152 and a temperature collector 153 are fixedly installed on the measurement section pipe, a sampling pipe 154 is inserted in the measurement section pipe, a smoke density measuring instrument 155 is installed at one end of the sampling pipe 154, a smoke exhaust fan 17 is installed on the second flow stabilizing pipe section 16, the smoke density measuring instrument 155 adopts a focusing light source pen and a light receiving device adopting an imported silicon optical amplifier for screen control, the data is stable and accurate, and a full-automatic control seven-level light filtering checking mechanism is arranged for automatically checking the light path.

It should be noted that: the hot-ball anemoscope for measuring the wind speed through replacement of the measuring section pipe fitting 15 solves the problem that the anemoscope is easy to damage, the damaged hot-ball anemoscope does not need to be replaced frequently any more, the smoke collecting hood support 11 is an independent support, the combustion test box 21 and the smoke collecting hood 12 are in a separated state, the influence on the measurement result caused by the combustion of the combustion test box 21 and the vibration can be reduced, the smoke collecting hood 12 is made of SUS304 materials, a smoke mixing baffle is arranged in the smoke collecting hood 12, flow deflectors are arranged in two steady flow pipe sections in the smoke exhaust component 1, flow equalizing surfaces are formed around the smoke pipes 14, the sampling pipes 154 are provided with filter screens, the cleanness of sample gas entering the analyzer is guaranteed, and valves for limiting and shunting the smoke are provided, so that the sample gas flow entering the analyzer is guaranteed.

It should also be noted that: the smoke collecting hood 12 for collecting smoke in the smoke exhaust component 1 and the smoke exhaust pipeline are all made of stainless steel pipelines, so that the appearance is tidy on one hand, and the smoke exhaust pipeline can be prevented from being corroded and is high-temperature resistant on the other hand.

In the embodiment: the temperature collector 153 employs a type K thermocouple having a diameter of 1.5 mm.

In the embodiment of the present invention, please refer to fig. 1, fig. 2, fig. 6 and fig. 8, the combustion assembly 2 includes a combustion test box 21, the combustion test box 21 is fixedly installed in the smoke collecting hood support 11, and the combustion test box 21 is fixedly installed with a style hoisting frame 24, the combustion assembly 2 is installed with a burner 25 therein, and the combustion assembly 2 further includes a front observation window 22 and a rear observation window 23, the front observation window 22 and the rear observation window 23 are respectively fixedly installed on a rotating door of the front end surface of the combustion test box 21 and a box wall of the rear end surface, and the burner 25 is erected on a movable trolley structure, the trolley structure is installed on the style hoisting frame 24 through screws, which is convenient for the worker to install and debug the machine, and can adjust the position of the hoisting frame 24 according to the difference of the actual use site, the burner 25 is pushed out from the combustion test box 21, the test box comprises a combustion test box 21, a sample lifting assembly 5, a low-speed winch and a matched pulley system, wherein the sample lifting assembly 5 is installed on the outer wall of the combustion test box 21, a steel rope of the low-speed winch penetrates through the matched pulley system to lift a sample ladder, the sample ladder is arranged in the combustion test box 21, a view screen control system 6 is erected on the side of a rear observation window 23 of the combustion test box 21, and a USB/RS232 serial port is arranged on a control box in the view screen control system 6 and can be externally connected with a desktop/notebook computer for operation control.

In the embodiment of the utility model, please refer to fig. 7 and fig. 9, air supply assembly 3 includes air supply fan 31, air supply fan 31's air outlet passes through pipe and supply-air duct 32 intercommunication, just supply-air duct 32's air outlet and the supply-air outlet intercommunication of burning test box 21, install pitot tube 33 on the supply-air duct 32, utilize pitot tube 33 to measure the wind speed and solved the problem that hot-bulb anemoscope damaged easily, avoided the change expense in the use and waited for the time cost that new anemoscope brought.

It should be noted that: the cable test sample is composed of a plurality of cable test samples with equal length, the length of each cable test sample is 3.5-3.6m, before the test is started, the cable test samples are placed at 10-20 ℃ for at least 16h to ensure the drying of the samples, the cable test samples are arranged in front of a standard ladder, the width of the standard ladder is 495 plus 505mm, the lowest position of the test samples is 200mm-300mm at the lower edge of a blowtorch, the length of the test samples above the lower edge of the blowtorch is 3300 plus 3325mm, the cable test samples or the cable bundle test samples are fixed on each crosspiece of the steel ladder by metal wires (steel wires or copper wires), and the cables with the diameter of 50mm and below are fixed by the metal wires with the diameter of 0.5mm-1.0 mm; subsequently, the air supply fan 31 is started, the flow is adjusted to 8000L +/-500L/min, the smoke exhaust fan 17 is started, and the flow is adjusted to 1.0 +/-0.5 m³The method comprises the following steps that/S, after airflow is stable, a test starts, a screen control system and a measurement section pipe fitting automatically acquire data, baseline data of 5min are acquired, when the test is conducted to 300S, a combustion assembly automatically ignites, when the test is conducted to 1500S, the combustion assembly automatically extinguishes, data are continuously acquired, when the test is conducted to 1800S, the test is finished, whether dripping exists or not and the burning time of dripping objects are recorded in the test process, if flame out is caused in the test process, the test is immediately finished, the test data are recorded, and a test report is generated;

it should also be noted that: the combustion test box 21 adopts a combustion chamber with a steel structure, the inner wall of the test box 21 is made of stainless steel, the outer wall of the test box 21 is made of A3 steel baking varnish and filled with mineral wool for heat preservation, a steel ladder is arranged to the top of the combustion chamber, and a square steel guardrail is arranged at the top of the combustion chamber, so that equipment and roof maintenance are facilitated, and the safety is improved;

it should also be noted that: the ignition source in the burner 25 consists of a strip-type propane gas burner and a venturi mixer, the fire supply surface of which is a flat metal plate with 242 holes with the diameter of 1.32mm, two sides of the fire spraying plate are respectively provided with a row of small holes, and the holes can keep the stable combustion of flame;

it should also be noted that: the gas distribution system 4 adopts a 316 stainless steel pipe, an electromagnetic valve and a manual valve are arranged in the stainless steel pipe, and the gas distribution system 4 is used for supplying fuel sources to the combustor 25.

The utility model provides a release rate testing arrangement is released to wire and cable heat's theory of operation as follows:

the cable test sample is composed of a plurality of cable test samples with equal length, the length of each cable test sample is 3.5-3.6m, before the test is started, the cable test samples are placed at 10-20 ℃ for at least 16h to ensure the drying of the samples, the cable test samples are arranged in front of a standard ladder, the width of the standard ladder is 495 plus 505mm, the lowest position of the test samples is 200mm-300mm at the lower edge of a blowtorch, the length of the test samples above the lower edge of the blowtorch is 3300 plus 3325mm, the cable test samples or the cable bundle test samples are fixed on each crosspiece of the steel ladder by metal wires (steel wires or copper wires), and the cables with the diameter of 50mm and below are fixed by the metal wires with the diameter of 0.5mm-1.0 mm; subsequently, the air supply fan 31 is started, the flow is adjusted to 8000L +/-500L/min, the smoke exhaust fan 17 is started, and the flow is adjusted to 1.0 +/-0.5 m³and/S, after the airflow is stable, the test is started, the screen control system and the measurement section pipe fitting automatically acquire data, 5min baseline data is acquired, when the test is carried out to 300S, the combustion assembly is automatically ignited, when the test is carried out to 1500S, the combustion assembly is automatically extinguished, the data are continuously acquired, when the test is carried out to 1800S, the test is finished, whether the dripping exists or not and the burning time of the dripping object are noted in the test process, if the flame is out of control in the test process, the test is immediately finished, the test data are recorded, and a test report is generated.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (6)

1. A wire and cable heat release rate testing device, comprising:

a smoke evacuation assembly (1);

combustion assembly (2), combustion assembly (2) erect subaerial, just combustion assembly (2) externally mounted air supply assembly (3), subassembly (1) of discharging fume is including collection petticoat pipe support (11), fixed bolt connection collection petticoat pipe (12) is gone up in collection petticoat pipe support (11), just fixed mounting has first stationary flow section (13) on collection petticoat pipe (12), first stationary flow section (13) are connected with second stationary flow section (16) through tobacco pipe (14), just install smoke exhaust fan (17) on second stationary flow section (16), be equipped with measurement section pipe fitting (15) in tobacco pipe (14), just measurement section pipe fitting (15) include two-way probe (151), two-way probe (151) fixed mounting is on the measurement section pipe of tobacco pipe (14), and on the measurement section pipe fixed mounting have KC caliber (152) and temperature acquisition appearance (153), it has sampling tube (154) to measure the intraductal interpolation of section, just smoke density measuring apparatu (155) are installed to the one end of sampling tube (154), combustion module (2) are including burning test box (21), burning test box (21) fixed mounting is in collection petticoat pipe support (11), just fixed mounting has style hoist and mount frame (24) on burning test box (21), install combustor (25) in combustion module (2), combustion module (2) are still including preceding observation window (22) and back observation window (23), preceding observation window (22) and back observation window (23) respectively fixed mounting on the rotation door of terminal surface before burning test box (21) and on the tank wall of rear end face.

2. The wire and cable heat release rate test device of claim 1, wherein the burner (25) is mounted on a movable trolley structure.

3. The device for testing the heat release rate of the electric wire and cable according to claim 1, wherein the air supply assembly (3) comprises an air supply fan (31), an air outlet of the air supply fan (31) is communicated with an air supply pipeline (32) through a guide pipe, an air outlet of the air supply pipeline (32) is communicated with an air supply outlet of the combustion test box (21), and a pitot tube is installed on the air supply pipeline (32).

4. The wire and cable heat release rate testing device according to claim 1, wherein the side wall of the combustion testing box (21) is provided with an air distribution system (4).

5. The electric wire heat release rate testing device of claim 1, wherein the outer wall of the combustion testing box (21) is mounted with a pattern lifting assembly (5), and the pattern lifting assembly (5) comprises a low speed winch and a matched pulley system.

6. The wire and cable heat release rate testing device according to claim 1, wherein a view screen control system (6) is erected on the side of the rear observation window (23) of the combustion testing box (21).

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