What are the components of a fireproof glass inspection furnace?

The fire resistant glass inspection furnace is an intuitive device for testing the fire resistance performance of fire resistant glass,and its testing function fully meets the testing requirements of the current test standard GB/T 9978-2008"Fire Resistance Test Methods for Building Components".The fireproof glass inspection furnace can inspect single piece fireproof glass(Class C),composite insulated fireproof glass(Class A),and fireproof windows.

The components of a fireproof glass inspection furnace with a complete detection system include:furnace body,furnace door,thermocouple selection system,furnace pressure measurement system,combustion system,and electrical control system.

1.Furnace body

The furnace shell is made of Q235 steel plate and profiles,designed as a sturdy and non deformable structure.The inspection port of the furnace adopts high-strength profiles such as channel steel,I-beam,and rectangular steel pipes,and is designed as a unique window structure,greatly reducing the time for glass size replacement.The furnace lining adopts a high-temperature resistant and high-purity aluminum silicate module,with an insulation layer thickness of 240mm.During the 3-hour high-temperature test,sufficient insulation will be provided.The aluminum silicate module has also been widely used in tempering furnaces,with light weight and good insulation effect.After testing,the aluminum silicate module was used for laying

During the combustion inspection process,the temperature inside the furnace should reach over 1000 degrees,and the temperature outside the furnace should not exceed 100 degrees.The effect is good.

2.Furnace door

The furnace door adopts a combination of screw and slot.When conducting a fire inspection,the screw is rotated to lock and ensure good sealing.After the fire inspection is completed,the screw is rotated to open and quickly dissipate the temperature.Adopting a patented window center window structure,it is easy to replace glass and suitable for burning inspection of various sizes of glass.

3.Thermocouple selection

3.1 Furnace thermocouple:A nickel chromium nickel silicon(K-type)thermocouple in accordance with GB/T16839.1,with a heat-resistant stainless steel casing and a heat-resistant material filled in the middle.The length of the hot end extending out of the casing shall not be less than 25mm,and the distance between the hot end of the thermocouple and the fire surface of the specimen shall be 100±10mm.The accuracy of the thermocouple test in the furnace is plus or minus 4℃.

3.2 Backfire surface thermocouple:A 0.5MM thermocouple is used for low-temperature welding on a round copper sheet with a thickness of 0.2mm and a diameter of 12mm,which complies with the requirements of GB/T 16839.1 for nickel chromium nickel silicon(K)type thermocouples.Each thermocouple has a length and width of 2 plus or minus 0.5mm.The testing accuracy of the insulated glass detection back fire surface thermocouple is plus or minus 4℃,and 12 interfaces are reserved for back fire surface testing.At the same time,a thermocouple can measure the temperature of 12 back fire surfaces.

4.Furnace pressure measurement

Using a T-shaped measuring probe and a pressure transmitter with an accuracy of 2 pa,the average pressure value inside the furnace is detected and the pressure change inside the furnace is controlled to achieve a pressure value of(15±5)pa 5 minutes after the start of the test and(17±3)pa 10 minutes after the test.During the operation of the experimental furnace,the pressure inside the furnace at a height of 500mm from the theoretical plane should be controlled to be 0,but the height of the heavy pressure surface should be adjusted appropriately

Using a T-shaped measuring probe and a pressure transmitter with an accuracy of 2 pa,the average pressure value inside the furnace is detected and the pressure change inside the furnace is controlled to achieve a pressure value of(15±5)pa 5 minutes after the start of the test and(17±3)pa 10 minutes after the test.During the operation of the experimental furnace,the pressure value inside the furnace at a height of 500mm from the theoretical plane is controlled to be 0,but the pressure value at the top of the test piece inside the furnace does not exceed 20pa by adjusting the height of the heavy pressure surface appropriately.

5.Combustion system

1)Burner:Adopting a high-speed burner with good flame temperature.Install a separate flameout system,ultraviolet flame detection device,and spark ignition device for the burner,

2)Ignition device:Each burner is designed with an independent ignition device and ultraviolet flame detection device.When the ignition is successful

Afterwards,the ultraviolet flame detection device provides feedback signals to the PLC,and the ignition display light lights up.When the ignition is unsuccessful,the sound and light alarm light will sound,prompting to press the reset button to restart the ignition.Effectively control the gas air fuel ratio through a proportional valve to ensure full combustion of the gas and ensure a heating curve.

3)Pressure switch:Air supply pressure switch/solenoid valve,high and low gas pressure switch.When the gas pressure is too high or too low,automatically cut off the gas pipeline to ensure safety.Customers can evacuate through the vent valve.

6.Electrical control

Adopting Omron high-precision PLC,the temperature inside the furnace is collected through thermocouples,compared with the standard curve temperature,continuously correcting the frequency of the combustion fan,controlling the air flow,and controlling the gas flow through proportional valves to achieve the optimal air fuel ratio,thus accurately controlling the temperature inside the furnace.

By detecting the pressure inside the furnace through a pressure transmitter and continuously correcting the frequency of the induced draft fan,the pressure value inside the furnace is controlled.The electrical part mainly includes electric control cabinet,computer integrated machine,high-voltage ignition device,circuit breaker,frequency converter,PLC,temperature measurement module,pressure detection meter,solenoid valve,overvoltage switch,undervoltage switch.