The SRT blower has a pair of tri-lobular rotors, with conjugate profiles turning in opposite directions inside a suitably formed casing, imprison the air or gases in the chambers formed between the rotor and the casing. The air or gas will be conducted towards the discharge of the machine, where the displaced air or gas is pressurized by the resistances and will find a backpressure that will help to automatically adjust the pressure to that found in the system itself.
The greater rigidity of the tri-lobular rotor, the better distribution of pressure around each lobule, the reduction of pressure peaks caused by backflow of the gases in the chambers formed between the lobules and the blower casing enable the machine to operate with a pulse cycle 30% below that of the bi-lobular rotor, improving the uniformity of the flow.
The synchronous operation of the lobules is obtained by means of a pair of high precision machined synchronized gears. The increased frequency with which the cycle repeats itself also improves the mechanical performance, consequently reducing the machine’s vibration and noise generation, on average around 5 dBA.
The pumping chamber within which the lobules transport the air from suction to discharge, is sealed by means of an oil deflector disc, operating together with seals that prevent the oil vapors to penetrate the pumping chamber.
The tri-lobular lobules and shaft constitute a more rigid assembly than the bi-lobular lobules, and a better distribution of pressure around the lobule. It results in lower radial loads, reducing the bearing loads, increasing their service life, enabling the machines to operate with less vibrations and higher speeds, allowing adoption of smaller machines and reducing installation cost.
The pumping chambers are fitted with pulsation and noise reducers. In addition, the tri-lobular lobules generate a pulse/noise frequency higher than the bilobular, which enables better efficiency in dampening pulsations/noise.
Lubrication of the gears and bearings is done by splashing, by means of splashing rings in an oil bath. Sealing of the exit shaft is done by means of labyrinth type seals which, contrary to the normal rubber retainers, have no contact with the shaft. The system eliminates oils leaks, reducing downtime for maintenance.
Manufactured in high precision CNC machines, specifically done for this service, which permit the precision of the components, essential for the machine to have high volumetric efficiency, guarantee of good performance within its specifications.
System non susceptible to impurities such as solid or liquid particles and can operate continuously with water injection to cool the gas or clean the pumping chamber.
Gears and bearings are splash lubricated and possibility of installation of cooling finned tubes to reduce the oil temperature in extreme operation conditions (only when mineral oils are used; not necessary if specified synthetic oils are used).
Entire shaft of special alloy steel and lobes of high quality cast iron guarantee the extreme rigidity of the unit.
In one unique piece of high quality cast iron for high resistance and long life operation.
Specially studied to reduce air leak and not allow lubricating oil in the casing.
Calculated for 100,000 hours operation working at maximum specified conditions.
Maximum pressure sustained:
Different types of seals are used, depending on the process conditions.
Besides the labyrinths normally used, specific seals for the process can be applied, among which, double mechanical seals, graphite labyrinths, special gaskets, etc.
Vacuum in a normal blower is limited to 500 mbar, since beyond this limit, due to the reduction of the volume of fresh air by aspiration, the machine begins to heat up to temperatures not tolerated by it. To avoid this inconvenience, machines that inject fresh air in the space delimited by two rotors (under vacuum) are used, and the cooling caused by the input of cold outside air does not permit excessive temperature increase, enabling the machine to operate down to a maximum vacuum of 900 mbar (see below operating scheme):
The data refers to inlet with air at 20ºC and 1,000 mbar abs pressure.
Blower Model | 710 | 713 | 720 | 816 | 821 | 831 | 1019 | 1027 | 1039 | |
---|---|---|---|---|---|---|---|---|---|---|
Maximum Capacity | m3/min | 3,85 | 6,10 | 8,90 | 9 | 11,23 | 18,31 | 17,70 | 23,33 | 32 |
Maximum Pressure | mbar | 900 | 1000 | 700 | 1000 | 900 | 700 | 1000 | 1000 | 700 |
Maximum Speed | rpm | 4800 | 4800 | 4800 | 4800 | 4800 | 4800 | 4800 | 4800 | 4800 |
Shaft Power | kW | 8,50 | 11,85 | 12,8 | 14,91 | 23,15 | 20 | 25 | 50 | 48 |
Drive Power | kW | 11 | 15 | 15 | 25 | 30 | 25 | 30 | 55 | 55 |
Noise Pressure Level (with or without sound proof cabine) |
dBA | 94 / 72 | 95 / 74 | 96 / 77 | 98 / 78 | 98 / 78 | 102 / 80 | 103 / 82 | 104 / 84 | 104 / 80 |
Max. Discharge Temperature | ax. ªC | 132 | 140 | 95 | 125 | 132 | 116 | 127 | 132 | 112 |
Weight | kgf | 67 | 77 | 92 | 105 | 120 | 140 | 165 | 190 | 214 |
Lenght | mm | 463 | 497 | 564 | 573 | 629 | 728 | 668 | 748 | 861 |
Width | mm | 319 | 319 | 319 | 355 | 355 | 355 | 355 | 420 | 420 |
Height | mm | 267 | 267 | 267 | 317 | 317 | 317 | 317 | 317 | 317 |
Flanges Nom. Diameter | mm | 80 | 80 | 80 | 80 | 100 | 100 | 199 | 100 | 150 |
Blower Model | 1323 | 1334 | 1348 | 1632 | 1643 | 1661 | 2138 | 2151 | 2172 | |
---|---|---|---|---|---|---|---|---|---|---|
Maximum Capacity | m3/min | 29 | 38 | 55 | 45 | 60 | 85 | 65 | 93 | 135 |
Maximum Pressure | mbar | 1000 | 1000 | 700 | 1000 | 1000 | 700 | 1000 | 800 | 600 |
Maximum Speed | rpm | 3800 | 3800 | 3800 | 3000 | 3000 | 3000 | 2400 | 2400 | 2400 |
Shaft Power | kW | 31,41 | 78 | 80 | 113 | 117 | 119 | 135 | 150 | 160 |
Drive Power | kW | 40 | 90 | 90 | 132 | 132 | 132 | 150 | 175 | 185 |
Noiser Pressure Level (with and without sound prof cabine) |
dBA | 106 / 86 | 106 / 87 | 104 / 86 | 107 / 88 | 104 / 86 | 107 / 87 | 106 / 84 | 106 / 86 | 106 / 85 |
Max. Discharge Temperature | ax. ªC | 127 | 130 | 98 | 121 | 117 | 86 | 100 | 112 | 76 |
Weight | kgf | 304 | 330 | 380 | 395 | 452 | 555 | 740 | 780 | 870 |
Lenght | mm | 764 | 874 | 1014 | 888 | 1000 | 1180 | 1070 | 1166 | 1376 |
Width | mm | 579 | 579 | 579 | 704 | 704 | 704 | 740 | 740 | 740 |
Height | mm | 398 | 398 | 398 | 498 | 498 | 498 | 628 | 628 | 628 |
Flanges Nom. Diameter | mm | 150 | 150 | 200 | 200 | 200 | 200 | 200 | 250 | 250 |
Blower Mode | 2745 | 2767 | 2780 | 3362 | 3384 | 33113 | 4289 | 42110 | |
---|---|---|---|---|---|---|---|---|---|
Maximum Capacity | m3/min | 102 | 160 | 230 | 160 | 212 | 282 | 360 | 415 |
Maximum Pressure | mbar | 1000 | 800 | 600 | 1000 | 800 | 600 | 1000 | 600 |
Maximum Speed | rpm | 2000 | 2000 | 2000 | 1600 | 1600 | 1600 | 1200 | 1200 |
Shaft Power | kW | 154 | 247 | 287 | 317 | 331 | 361 | 387 | 475 |
Drive Power | kW | 185 | 300 | 330 | |||||
Noise Pressure Level (with and without sound prof cabine) |
dBA | 107 / 88 | 106 / 90 | 105 / 86 | 106 / 87 | 106 / 87 | 106 / 86 | 107 / 85 | 107 / 88 |
Max. Discharge Temperature | ax. ªC | 130 | 123 | 75 | 130 | 96 | 75 | 10 | 86 |
Weight | kgf | 1200 | 1440 | 1630 | 2200 | 2620 | 2700 | 2600 | 2800 |
Lenght | mm | 1223 | 1452 | 1662 | 1564 | 1811 | 2049 | 1680 | 2026 |
Width | mm | 880 | 880 | 880 | 958 | 958 | 958 | 971 | 971 |
Height | mm | 710 | 710 | 710 | 990 | 990 | 990 | 971 | 1120 |
Flanges Nom Diameter | mm | 250 | 300 | 350 | 300 | 350 | 400 | 500 | 500 |
OMEL supplies a whole range of accessories or peripherals able to put the unit into operating conditions within the current legislation. Motors, bases, aspiration and discharge silencers, absorption or resonance, inlet filters, couplings, safety and retention valves, de-noise cabins, and flexible joints are some of the accessories normally supplied.
For the table of dimentions of SRT Product Line please refer to product catalog.
Attention: the blowers sizes SRT 07 to SRT 10 are also manufactured with horizontal fittings, and then they will be called SRTH followed of the size.