Gardner Denver DH 7-410kw Oil-free Water Lubricated Air Compressor

Why Oil-Free Compressors?

There's a lot riding on the quality of your ai. The presence of particles, condensation, oil and oil vapor in a compressed air system can leadto downtime, product spoilage and recall, damage to your brand reputation, or worse, harmed consumers and product liability.

For reliability

A robust product and system design delivers top quality air, protecting sensitivedownstream equipment, lowering maintenance and extending equipment life

For productivity

The use of an oil-free Class 0 certified compressor guarantees contamination free air,eliminating the risk of product spoilage and waste

For serviceability

Our oil-free equipment is designed specifically to make maintenance easy byproviding clear access to consumable components

For lower cost of ownership

Higher initial costs for oil-free systems are more than offset by lower operational andmaintenance costs over a system's life to maintain the highest air quality

Oil-Free Water Lubricated Compressorsfor Your Application

Ingersoll Rand offers a wide portfolio of reliable oi-free products that will adapt to your industry and application. We wil asess and proposethe best oil-free solution to increase the productivity of your installation, providing zero risk of contamination of your final product.

Advantages of Oil-free Water Lubricated Single Screw Compressor

Efficient and Energy Saving

When the sinale screw compresor is working, each screw groove in the screw is used twice in one rotation. so thatits space can be fully utilizedthus its structure size is smaller than other rotary compressors

The screw groove depth of single screw becomes shallower with the increase of compression chamber pressure, and it is zero when the exhaust is over, so there is no clearance volume theoretically

When water is used as the colant, resulting in lower temperature, higher eficienay and remarkable energy-saving effect during compression

of the air end

Safe and reliable

One screw and two star wheels (left and right) form 12 compressiorchambers, which trigger 12 air compression processes per revolution

The two star wheels of the single screw air compressor are symmetricallydistributed on two sides of the screw, ensuring force balance . The axiaforce and radial force acting on the screw can offset each othereffectively restraining the vibration source

The rotor is in force balance with small pulsation, low vibration, morereliable performance and longer service life

Working Flow Chart of Oil-Free Water LubricatedSingle Screw Air Compressor

Pure Oil-free

Employing the water-lubricated cooling technology, withno oil coolant in the compression chamber, thus providingabsolutely oil-free compressed air

Soundproof and Environmentally Friendly

The motor is directly connected with the screw to drivethe gearless box, thus eliminating noisy parts

The soundproof box type outer casing is designed toeffectively enclose the noise inside the unit so that theoperating noise of the complete machine is kept at a lowerlevel

DH-series oil-free water lubrication permanent magnet VSD air compressors

DH-series oil-free water lubrication permanent magnet VSD air compressors adopt the water lubrication coolingtechnology, which does not use oil coolants in the compression chamber, They can provide users with pure compressedair to meet various production needs.

Low-pressure model DH37-250(3/4bar)

Normal-pressure model DH7-160(7/8/10bar)

Medium-pressure model DH55-410(20/30/40bar)

All series are ls08573 Class 0 oil-free certification

Highly efficient airend

Direct injection of pure water in the compression chamber forcooling, without using oil coolants, realizing truly oil-freecompressed air

The airend rotor is made of stainless steel, which will never rust

Bearings are made of high-end stainless steel to ensure the reliabilityof water lubrication, thus having high efficiency and low noise

The airend has no metal parts or metal mesh parts, achievingbalanced, stable and reliable rotor stress, as well as long service life

Rare earth permanent magnet VSD motor

Gardher Denver's DH-seres oi-free water lubrication permanent magnet VsD air compresors are equipped with rare earth permanent magnet VsD motorsCompared with the AC asynchronous motor, rare-earth permanent magnet motor has simple stnucture, reliable operation, high power density and widespeed regulation range, becoming an ideal power choice for efficient and energy-saving air compressors

Electric rotor

Permanent magnet rotor, with smaller loss and efficiency increaseby 5-10%

Low noise

Reasonable groove pole matching, magnetic field design, wider operating frequency, and lower operation noise

No-shock starting

Smooth soft start, with starting current not more than 2 times of the rated current

Small volume and light weight

1-2 frame-size smaller compared with same-power asynchronous motor

Large starting torque

The starting torque and overload capacity of permanent magnetsynchronous motor are one power level higher than that ofasynchronous motor.

Large starting torque

The rotor does not need electrical excitation and can achieve hightorque at low speed

Oil-free Water Lubricated Permanent Magnetic VariableFrequency Screw Air Compressor of DH series

Advantages of Frequency Conversion

Ordinary air Compressor usually adjust the air consumption by adjusting the air inflow of the air compressor, keeping the aircompressor running at the rated speed. Therefore, the actual energy consumption will not decrease proportionally, even if the airconsumption decreases.

The exhaust volume of the variable frequency air compressor can be perfectly combined with the user's air consumption When buying an air compressor, the traditional cost (the purchase cost and the operation and maintenance cost) only accountsfor 20% of the total cost, while the energy consumption accounts for 80%. Compared with traditional air compressors, variablefrequency air compressor of DH series can save at least 30% of energy From the beginning of your investment and operation, variable frequency air compressor of DH series will save your costs

Smooth Start

No starting current peak

Completely eliminate the energy consumption during unloadingReduce the burden of electrical components

Variable freguency starting current is low with no shock on thepower grid, which is especially important for users in the areawith the unstable power grid

Stable Output Pressure

Frequency conversion control can keep the pressure band within0.1 bar, so there is no need of a large gas tankThe pressure will not exceed the required value, resulting in noenergy waste

Shock-free Start

The starting torgue of the motor is low, resulting in a small shockon mechanical parts, so the service life of mechanical parts (suchas bearings) is longer

Transfer torque as required, resulting in no energy waste

Frequency Converter with Excellent Performance

The built in frequency converter with unique air duct design can ensure stability and reliabilityThe cutting-edge vector control technology is adopted to provide good low-frequency speed and dynamic response featuresAll-round protection function can realize all-round protection from frequency converter to motor The safe liahtning protection design with built-in lightning overcurrent protection device effectively improves the inverter'sself-protection ability against lightning induction

DH Series Permanent Magnetic (PM) Variable Speed Drive (VSD)Oil-free Water Lubricated Screw Air Compressor

Smart Control

Powerful VSD control for automatic load regulation and comprehensive protection of motor and other components

Unique design, and alarm, startup, shutdown, frequency hopping and other settings customized by users based on their needsm Self-diagnostic LcD touchscreen controller with MODBUS RS485 communication port for remote control

Standard Stainless Steel (SS) Pipelines for Full Series

SS pipelines are equipped for Gardner Denver full series of water lubricated products as standard, which are obviously superior toordinary carbon steel pipelines in that:

Anti-corrosive SS free from scale or rust eliminates customers' worries about

rusting of carbon steel pipelines

Smooth inner wall of SS pipelines greatly reduces pressure losses due to lowfriction coefficient

SS pipelines are resistant to high temperature & pressure, and can be usedfor long without leakage and aging, thus effectively extending service life ofthe air compressors

Automatic Control System for Water Circulation

he water circulation system is comprised of softener, water filter, water cooler and water / gas separator, which are allautomatically controlled and operated to keep the circulating water in a highly clean state and meet the requirements of theair compressor unit

The quiet design of all components in the water circulation system eliminates high-frequency noise and significantly reducesoperating noise of the water-lubricated unit

Water filter and water / gas separator is made of stainless steel for higher quality, reliability and performance

Low-pressure Oil-free Permanent Magnetic Variable FrequencyScrew Air Compressor

Widely used in the following industries

Chemical industry

Low-pressure compressed airis used in a variety of chemicalprocesses

Glass bottle blowing

Various glass bottles are blownwith low-pressure compressed ail

Textile industry

Chemical fiber & textile

various textile machines

Powder conveying

Large amounts of low-pressure

compressed air are used to

convey powdery substances

DH-series two-stage compression oil-free water lubrication permanentmagnet VSD air compressors

More efficient and energy-efficient two-stage compression technology

In the two-stage compression process, the compression ratio at each stage is low, which correspondingly reduces the bearingload and thus extends the component life.

With two-stage compression, the compression ratio at each stage is reduced to reduce internal leakagemThrough inter-stage cooling, the second-stage compression is closer to isothermal compression, thus saving energy

Medium-pressure products are mainly used in the PET blowing industry

Medium-pressure water lubrication products are mainly used in the PET blowing industry. Compared with traditionalmedium-pressure piston products, medium-pressure water lubrication products have outstanding advantages.