Product model: SDS
Impeller diameter: 630-1250mm
Air volume range: 8.1-51.5m ³/ s
Pressure range: 2500n
Operating temperature: 280 ºC, 60min
Driving form: data sorting
Purpose: Subway / tunnel smoke exhaust
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We are specialized for fabrications, large and small. We have laser cutter and plasma cutter.
Why Choose Us?
1. We have 12 years experience in large matal fabrication with low price and high quality.
2. All kinds of surface treatments are available: Polishing, Epoxy Coatings, zinc plating, nickel plating, powder coating, e-coating, DIP coating, phosphate coating, anodizing, painting, etc...
3. We can provide aluminum alloy castings, fabrications, deep drawing, machining, welding and assembly.
4. Roviding samples with important dimensions and customizing inspection report, material certification to customer for validation and verification
5. We specialize in fast turn around with low volume orders. Please forward your specification for quoting.
Material: carbon steel or according customer requirement.
Thickness: above 6mm or customized
Size: according to customer's requirement or drawing.
Surface treatment: shot blast, galvanize, oil, painting...
Matal cutting: laser cutting(
<=20mm), plasma cutting
MOQ: 1pc
Production time: one-two weeks
Technology: rolling forged and welded
Package: steel pallet
Welding workshop
Centrifugal fan casing
Product introduction
1, Overview of SDS jet fan
SDS series jet fans are the mechanism research results of the company and Shanghai Jiaotong University and new products developed by drawing on advanced technologies such as Japan and Germany. The engineering technology center of the company is committed to continuous research, development and technological innovation of theoretical technology. It also has extensive exchanges with abb and other large international companies and fully investigates subways, expressways, railway tunnels Water conservancy and dam engineering and other systems, as well as consulting experts from relevant subway design colleges, tunnel design and tunnel installation companies, mastered the use requirements of the fan, and accumulated rich experience in product technology, quality requirements and use conditions. The efficiency and sound level of the fan are better than that of the conventional axial flow fan. The selection of fan varieties and specifications, optimization of various working system matching, and ranking the leading level of domestic peers.
SDS series jet fans range from 630mm to 1600mm in specifications, and are divided into two categories: one-way running axial fan and reversible (two-way) running axial fan. The maximum thrust is 3500n High efficiency and low noise fans can be selected for both load and working conditions.
SDS series jet fan adopts advanced technology to obtain good quality assurance. The fan shell is formed by spinning and flanging with domestic advanced special CNC machine tools. The inner wall of the front section of the impeller is processed with gold, which not only ensures the coaxiality and strength of the shell, but also ensures the meridional clearance of the blade. The outer surface is hot-dip galvanized, with beautiful appearance and excellent anti-corrosion performance. The fan blade The wheel hub is processed into die casting mold cavity by domestic advanced full CNC boring and milling machining center, and aluminum alloy high (low) die casting is formed by high-pressure casting and low-pressure casting machines respectively. The actual use of subway, expressway, railway tunnel, water conservancy dam project and other users has proved that the performance indexes, corrosion resistance, reliability, economy and other technical, quality requirements and economic indexes of the fan are fully suitable for the use of all kinds of tunnels and subways.
2, Code representation of SDS series jet fan
3, SDS series jet fan selection reference
1. Main features of fan
Hanfeng SDS series jet fans have the advantages of low noise, large flow and high thrust. All indexes meet the requirements of JB / t10489-2004 design conditions of jet fans for tunnels and GB / t19843-2005 / is013350:1999 performance test of jet fans for industrial fans.
Under the specified working conditions, the design service life of the fan shall be at least 10 years (except vulnerable parts), and the safe operation time before the - overhaul shall not be less than 2000h
High temperature resistance: the fan will not have mechanical, electrical or structural faults within 60min of continuous operation when the gas temperature is 250C.
The ratio of reverse flow to forward flow of unidirectional jet fan can reach 50% - 70%; The ratio of reverse flow to forward flow of bidirectional reversible jet fan is greater than 96%.
The noise limits of all types of jet fans comply with jtj026 1-1999 code for design of ventilation and lighting of highway tunnels stipulates that the a sound level measured by the fan in the field, 10m from the center point of the fan outlet and at an angle of 45 ° with the fan axis shall not exceed 77db (a)
The support strength of the hanger for fan installation shall be more than 15 times of the static load of the fan, which is convenient for installation. The structural size of the hanger can be adjusted according to the actual embedded parts of the tunnel
The jet fan is set at 15cm ~ 20cm of the tunnel building boundary, and the fan axis is parallel to the tunnel axis. The setting method of the fan should be fixed or suspended.
All parts of jet fan are treated with anti-corrosion and anti rust treatment, and coated with two layers of high temperature resistant anti rust primer and two layers of high temperature resistant finish paint In case of special requirements, the silencer orifice plate adopts stainless steel plate, the fan surface is galvanized, and the connecting bolts are stainless steel bolts.
2. Basis for design and product selection of tunnel ventilation system
2-1. In principle, traffic tunnels can be divided into three categories: subway, highway tunnel and railway tunnel.
2-2. The prerequisite for the safety and reliability of normal operation and emergency operation is to install an environmental control system that ensures the coordination and full play of the two systems.
A mechanical system: ventilation, fire control, sewage discharge: B power system: power supply, transmission and distribution, emergency power C lighting system, lighting, local lighting, fluorescent indication d communication system: telephone, radio, computer terminal
E traffic system: lights, signals, signs, monitoring f control system: control of traffic conditions and equipment operation conditions
2-3. The tunnel ventilation system can have the following three basic modes and can adopt mixed mode.
Longitudinal ventilation system: This is the most basic ventilation mode. The fresh ventilation air flows from the tunnel inlet end to the outlet end, and there is no need to install ventilation duct along the longitudinal direction of the tunnel. The reversible jet fan is generally selected for this ventilation mode. The fan is installed on the top or side of the tunnel, which can fully ventilate in two directions to achieve two-way ventilation or control smoke; If the tunnel is long, a central air supply and exhaust shaft must be added, which is connected with the atmosphere to form a mixed ventilation mode.
Full transverse ventilation system: air supply and exhaust ducts are set along the tunnel direction. Fresh air is collected from the air Pavilion and exhaust air is discharged from the air tower. Generally, the air supply duct is set below the road surface, the exhaust duct is set at the upper part of the lane, and the air supply duct is not separated from the exhaust duct; Air supply and exhaust outlets are set at intervals. Under accident conditions, even if the cross section of the tunnel is vented, smoke can be extracted
Semi transverse ventilation system: the system can be divided into supply semi transverse ventilation mode and exhaust semi transverse ventilation mode. Similarly, exhaust semi transverse ventilation mode is adopted. Fresh air enters from the hole, and the exhaust phase is a full transverse ventilation system.
2-4 factors to be considered for tunnel ventilation system
A. Project investment B, power capacity C, operation cost
D. Air quality e, safety factor F, assurance measures under emergency
Based on the above factors, the optimization scheme is established
2-5. Factors for selection of number and number of fans in tunnel ventilation system
A. Co, NOx and smoke concentration B, traffic flow (traffic flow density and speed per hour) C, force load (tunnel length, width and height) d, exhaust gas emission (vehicle age and quantity) e, emergency measures in case of fire
2-6. Theoretical basis for thrust calculation of tunnel ventilation system
Theoretical basis for thrust calculation of tunnel ventilation system
inlet and outlet resistance loss
friction coefficient of tunnel surface and equipment
vehicle friction coefficient (calculate the motion or piston wind effect under the most unfavorable conditions)
impact of wind speed outside the tunnel on the entrance and exit under the most unfavorable conditions, tunnel terrain and location (slope and altitude)
thrust required in case of fire alarm (temperature, pressure, time)
The tunnel depressurization (PA) theory is converted to the thrust required by the jet fan (n)
the thrust of jet fan is the momentum change of fan inlet and outlet, i.e. fan thrust
Ns-c01 mass flow air velocity (n)
Chinese formula: ns = fan static thrust (lS0) n value C1 = empirical correction coefficient
Mass flow = air density x volume flow
The relative velocity between the jet fan used in the tunnel and the air flow in the tunnel and the friction coefficient in the tunnel are related to the influence of parallel arrangement in the same group. Therefore, the effective thrust of the jet fan is: ne = NSX (1-vt / VJ) c2xc3
Where ne = effective thrust of fan (n) VT = wind speed in tunnel (M / s) VJ = jet velocity (M / s) C2 = friction coefficient in tunnel
C3 = flow direction loss in parallel arrangement of the same group (this loss is 100 times the diameter of the fan separated between the units, so that the jet speed does not affect the main direction of the downstream air flow, which can be ignored).
2-7. Structural characteristics of ventilator used in tunnel ventilation system
Referring to the above figure, the tunnel fan is divided into two specifications with muffler and without muffler [add collector (diffuser) at the inlet and outlet], as well as one-way jet fan (SDS) and two-way jet fan [SDS (R)].
Fan shell, collector (diffuser), muffler and support foot: NC automatic welding and machine forming of steel plate are adopted, and the surface is treated with hot-dip galvanizing or dry film epoxy resin after hot-dip galvanizing, so as to ensure the strength and anti-corrosion of the fan.
Fan impeller: in order to meet the needs of tunnel ventilation, SDS series fan can change the number of blades and the angle of fan blades. Muffler: the length of the muffler is usually twice the diameter of the fan. When the noise requirements are high, it can also be twice the diameter of the fan. The muffler and the fan body are fixed with bolts.
The supporting motor of SDS series jet fan is fully enclosed squirrel cage. The motor is equipped with flange mounting plate. The motor insulation is class H and the protection grade is IP55. The outgoing cable of the motor can be connected to the junction box on the fan body casing. The motor is equipped with lubricating grease nozzle, and the external metal hose is connected to the lubricating grease nozzle on the fan body casing.
Reversible switching time of fan: in case of emergency, the forward and reverse switching time of jet fan is very important. SDS (R) fan has two switching methods, electronic and mechanical, which can switch to the rated speed of fan within 30 seconds.
3. Test and detection of SDS series jet fan
Thrust test: measured by thrust test device.
High temperature fire test: tested by Tianjin fire test and detection center of the Ministry of public security.
Noise test: both the inlet and outlet of the fan with and without muffler are tested on an open site (when the atmospheric wind speed is close to 0). The sound pressure level of the fan is measured at an angle of 45 ° along the fan axis and 10m away from the fan casing.
Fan efficiency: the operating efficiency of the fan is defined by the measured thrust (n) and motor input power (kw). The test and detection are carried out by the Engineering Technology Center (Test Research Center) of Hanfeng company in strict accordance with relevant national and industrial standards, and tested by provincial and national authoritative supervision institutions.
4. Commissioning and operation of SDS series jet fan
1. After the fan is installed, carefully check the following items before the fan is started:
whether the voltage is within the normal range (usually 380V ± 6%) and whether the three phases are balanced;
check whether the blade top clearance meets the requirements, and manually move the impeller to check whether there is collision; check whether there are impurities in and around the fan. If so, remove them immediately;
click the switch to test run the fan, and check whether the rotation direction of the fan impeller is consistent with the direction indicated on the label. If it is inconsistent, cut off the power supply and replace the power wiring 2 with each other;
check whether the rated speed of the motor is consistent with the rated speed of the fan; check the grounding wire and current protector (fuse) as required;
the fan commissioning can be started only after the above inspections are completed. In case of severe vibration during commissioning, the fan power supply shall be cut off immediately and the inspection shall be carried out after the fan stops stably.
if everything is normal, stop the fan after 10 ~ 30 minutes of trial operation, and check whether the blade bolts are loose. If there is no looseness, the fan can stand by and enter the normal state.
2. During the normal operation of the fan, first pay attention to the motor current, which is the signal of fan load and fault display; Secondly, regularly check the vibration of fan and motor, and pay attention to whether there is abnormal sound of friction and impact.
3. During the normal operation of the fan, the fan shall be shut down immediately for inspection or repair when the following conditions occur: the current suddenly increases and exceeds the normal range; abnormal vibration or impact sound; motor bearing temperature rises sharply.
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