Add:No 23# Genggeng Road Genggeng Industrial Park,Baoying, Yangzhou City, Jiangsu Province,China.
Tel:0514-88310932
Fax:0514-88982498
PO:225811
Email:yokielectric@yokieiectric.com
Website:http://www.yokielectric.com
Electric heating is a kind of electrical energy into heat energy, heating technology play a holding role. The use of the heat generated by electrical heating supplement due to temperature reasons which led to the loss of heat pipes to achieve heat balance within the media channels. It can uniformly heat the pipeline along the longitudinal direction, the required amount of heat (electric power) is much lower than electric heating. Electric heating technology temperature gradient is small, high thermal efficiency, long time thermal stability, long life, suitable for long-term use. In addition, the electric heating can achieve remote control and automatic control, can be flexibly applied as needed on various types of pipe insulation, to facilitate the design, construction, installation, no pollution, is a national focus on the promotion of energy-saving technologies.
Self-regulating
heating cables from the tape core, polymer inside the sheath, shielding
alloy and polymer outer jacket composition. Tape
core is a complex polymer composite, which composite made from a
variety of materials and a conductive medium, after a specific chemical
and physical changes in extrusion processing, a composition between the
two parallel wires is maintained continuously parallel The heating elements. During
heating, the interior of the semiconductor material occurring polymer
positive temperature coefficient change, and the molecule has a special
memory. Such a strong memory response. When
the ambient temperature rises, the polymer micro molecules swell,
carbon gradually separated, causing the circuit interruption, the
resistance rises, tracer automatically reduces power output; when the
ambient temperature decreases, the polymer particles and shrink and
spacing Small,
carbon connected together to form the corresponding circuit tracer
heating temperature and automatically rises; when the ambient
temperature is a steady state, the system will reach a stable heat
output, it has a temperature self-limiting. It also controls the temperature is not too high not too low, automatic mediation.
Self-regulating
heating cables belonging to shunt strips, in any local heating belt has
to adapt to changes in environmental temperature alone automatic
adjustment function (any temperature - power output). So it can be cut in the allowed range of length can be adapted to
the needs of different lengths, which is very convenient on-site
installation and construction.
Second, fire pipeline Environmental Monitoring System
Fire
pipeline environmental monitoring system consists of the power supply
system, heating system, temperature monitoring alarm systems, thermal
insulation systems. To maintain communication links the entire pipeline environmental
monitoring system and fire alarm controller via the fire alarm control
module.
(A) power supply system
Transformer power supply system design capabilities through the AC transformer
220V voltage into a DC voltage of 24V. Power supply system is designed with air switch, make sure that
when the time to cut off the power supply short-circuit protection of
electronic control equipment and wiring.
(B) heating system
Arranged
along the longitudinal direction of the pipeline fire self-regulating
heating cable, consider installing more humid environment, the need for
moisture treatment or waterproof insulation Self-regulating heating
cable. This double jacketed, with tropical, waterproof good insulation
properties, can be adapted to a variety of complex and harsh environment
and prevent leakage of moisture and erosion, protecting heating system
from damage.
(C) temperature monitoring alarm system
Temperature
monitoring alarm system including fire alarm control module,
temperature monitoring, temperature smart sensors, alarm buzzer, circuit
monitoring equipment. Temperature
monitor can be set to the target temperature range depending on the
installation environment, temperature exceeds the set point, the buzzer
will prompt an alarm. While
the temperature smart sensors will be on or off command signal to the
heating system of the receiver, the automatic switch off or on the power
supply system, to achieve power protection and low temperature start
heating purposes. Fire
alarm control module directly communicates with the host in the
pipeline environmental monitoring system itself breaks down or does not
work, can signal back to the fire alarm control, alert staff fault alarm
fire control center, the scene in time to prevent the fire pipeline frozen, cracking.
Sensor fire pipeline environmental monitoring system used for the integrated temperature sensor. It is a way to 温敏晶 transistor, amplifier, temperature compensation
circuit integrated on the same chip temperature sensor, compliance with
fire pipe installation, the temperature required to run the
environment, can be measured
Temperature in the range of -50 ~ 150 ℃. This type of temperature sensor, small size, low cost, good
linearity, high accuracy, high reliability, repeatability and flexible
interface.
Temperature
monitor and automatically adjust the temperature of liquid thermal
expansion and contraction and the use of liquid incompressible
principle. Fire pipeline environmental monitoring system uses an electronic
thermostat, by resistance temperature sensing methods to monitor the
temperature, the temperature signals into electrical signals,
self-regulating heating cables start or stop by the SCM, so as to
achieve a temperature monitoring.
(D) insulation system
Fire
pipeline environmental monitoring system mainly phenolic foam
insulation materials, mainly phenolic resin as the main raw material,
adding curing agents, blowing agents and other auxiliary ingredients,
resin crosslinking at the same time, blowing agents produce gas uniformly dispersed in the material and the formation of foam. It
has a uniform closed cell structure, low thermal conductivity, good
insulation properties, with carbon deposition under the direct flame
effect, no drip, no curling, no melting phenomenon, formed on the
surface layer of flame "graphite foam" layer, effective protection foam structure within the layer, anti-flame penetration time of up to 1h. After 25mm thick phenolic foam board is subjected to 1500 ℃ flame
injection 10min, charring the surface only slightly and not burn, but
will not emit smoke and toxic gases.
Third, the fire pipeline environmental monitoring system installed
(A) Installation Specification
Installation
of fire piping environmental monitoring system involves many fields of
technologies, in the choice of equipment, construction and inspection
work, must comply with the relevant national construction and
acceptance, including: "pipe and equipment insulation, condensation and
electric heating norms "," Electrical equipment installation construction and
acceptance of norms "," 1kV and below the line construction and
acceptance norms "," enclosure and secondary circuit construction and
acceptance "
"Tracer line construction and acceptance", "Basic environmental
testing procedures for electric and electronic products", "electronic
measuring instruments Electromagnetic compatibility test specification"
and so on.
(Ii) construction requirements
Fire pipeline environmental monitoring system is an external device
electrically controlled fire alarm system, fire relying on input and
output modules directly with the host fire alarm signal.
Mainly
installed in the absence of heat or temperature below 0 ℃ local fire
pipeline, such as the building rotating inner hall, the basement area of
extremely low temperatures, lack of insulation and other measures of
individual regions. These locations are in winter the cracking of pipeline-prone
areas, after the installation of fire piping environmental monitoring
systems, real-time monitoring of the regional pipeline temperature and
low temperature alarm, in time to avoid leakage.
When
the construction site, with the tropics should not drag, it was damaged
hard object and prevents water and dirt splashed on it. Band
may be suitably bent, but pay attention to light and slow when it is
folded or bent, while allowing the bending radius of not less than six
times the thickness of the heating cable. The band
The
laying of the pipeline should pay attention to the fire, the two need
to be tightly fit to come off, so you can improve the heating efficiency
of heat dissipation, the two fixed penetration fixation should be
avoided, avoid the use of any material metallic nature, should be
dedicated nylon strap banding fixed, or fixed with aluminum foil tape, fixed
electric with tropical heal after laying it flat on the outer surface
of the pipe.
Under
normal circumstances, fire pipeline environmental monitoring system
installed in the building has been completed and put into use in
building fire water system. Try
to avoid the installation of the original valve position, such as when
the inevitable encounter, the possibility of dismantling the existing
valve is small, consider installing required, with tropical needs to be
cut, when to pay attention to sealing joints after re-fitting. After
all the self-regulating heating cable is installed, must be
electrically testing each circuit, resistance between 500V insulation
resistance using ohm meter to check the system, the cable core and the
ground or neutral uncharged It should not be less than 5MΩ. Check
the heat after power band, the recording data before proceeding to the
outer layer of insulation construction after several tests correctly. Insulation material is installed, you need to make a significant
mark electric heating, play reminder avoid other construction damage.
Temperature
sensor is mounted close to the fire required pipe wall, using foil tape
tightly fixed, must maintain a certain distance from the
self-regulating heating cable. Temperature sensors should be installed in a hidden location,
wrapped in insulation, metal hose lines must be protected on the
connection.
Fourth, the application and effect of the case
Case I: Shenyang, a large hospital outpatient building main entrance hall. Shed
location on the building foyer and construction specifications
according to design specifications, there are two fire sprinkler pipes,
fire sprinkler multiple points, using ordinary spray nozzle under,
between January and February, a number of points shower bubble
burst, individual elbow is the cracking, resulting in fire sprinkler
pipe leakage, damage the furnishings, after repeated repair, still
frozen after replacing the fusible metal nozzle circumstances arise. To
avoid leaks, in winter from January to February temporarily out of the
local pipe watery diarrhea, closing the range line valves, to ensure
safety. In
order to avoid the cracking phenomenon, according to the construction
unit of illustration, it is on the front of the fire sprinkler piping
design and installation of a pipeline environmental monitoring system,
and the signal is connected to the nearby input and output modules. After testing, the device functions properly, install three months after the temperature setting range system
EC does not appear abnormal, the installation and testing of
December, January, February and winter cold period, pipe fittings and
spray foam is not frozen, it is now part of the normal open foyer
sprinkler pipe valves, fire sprinkler system is operating normally.
Case II: A unit of the canteen. The building is one building, functions as the staff canteen, building height 5m, with plaster board hanging shelf. Winter
studio spraying the main pipe and branch pipes are leaking incident,
extensive damage decoration, partial wall was severely brew. After
examination, the building has two roof vents, closed lax, resulting in a
large indoor and outdoor temperature is the cracking sprinkler, indoor
air conditioning and heating, the use of gypsum board hanging shelf
blocking heat rises, winter shed to achieve the following 0 ℃. After blocking the vent insulation, just below the two outlet
pipes, the installation of the pipeline environmental monitoring
systems, the measurement of each part of the equipment is working
properly, after increases in most piping insulation, after the winter,
no water leakage occurs.
V. Conclusion
Based
on the self-regulating heating cable technology, we designed a low
temperature alarm, fire pipeline environmental monitoring system with
automatic temperature control function. Actual
install applications and feedback, indicating that the system has a
heat capacity, safety, environmental protection and other features, can
effectively solve the cracking problem of pipeline fire, fire pipeline
to enhance cold tolerance, guarantee the normal operation of fire
protection systems.