Two Stage Screw Air Compressor

The two-stage screw air compressor directly outputs low-pressure compressed air of suitable pressure, and the exhaust volume is obtained with relatively small energy consumption. The rotor clearance and the host casing are precisely designed. Not only the exhaust source port is changed, but all the designs of the host meet the requirements. Large flow and low pressure requirements, such as enlarged bearing seats. The partial axial air inlet design is introduced to fully utilize the effective length of the screw for compression, while reducing the operating noise of the main engine, effectively reducing the radial unbalanced force, and extending the life of the main engine and bearings.

The entire series of two-stage screw air compressors have high energy efficiency performance, among which the 75~250kW products are much superior to the first-stage energy efficiency standards.

Compared with single-stage compression, the two-stage compression air compressor cools the high-temperature air after the first-stage compression through oil injection, and the air is compressed at an equal pressure, thereby reducing the second-stage suction temperature. The entire compression process approaches isothermal compression, reducing the Compression power consumption;

The pressure ratio of each stage of two-stage compression is reduced, so the seal leakage between the rotors is greatly reduced and the volumetric efficiency of the machine head is improved;

For air compressors with the same power, compared with single-stage compression, two-stage compression can theoretically increase the exhaust volume by up to 8~15%, correspondingly saving 8~15% of energy consumption. When running at full load continuously for a long time, the efficiency and cost are better;

In addition to high efficiency and energy saving, two-stage compression also has stable and reliable characteristics. The operating pressure is reached through two-stage compression. The small pressure ratio of each stage means that the pressure difference between the intake and exhaust of each stage of the rotor is small, the main components are subject to small stress, and the heat load is low. . At the same time, it can also reduce the load on the bearings, extend the service life of the host, and ensure efficient and reliable operation of the entire machine.

Using Drago's main engine, a special main engine design, the first-stage compression unit and the second-stage compression unit are integrated into one body, driven by gears, so that the rotor of each stage of compression unit can obtain superior linear speed.

Own rotor profile reduces leakage area and improves compression efficiency.

Between the primary and secondary compression chambers, oil injection cooling is introduced to replace the intercooler, which significantly reduces the loss of compressed air. At the same time, the dew point temperature of the compressed air is controlled to an optimal level to prevent liquid water from entering the secondary host and causing corrosion. Prevents oil emulsification.

Both the primary and secondary main engines introduce a partial axial air inlet design, making full use of the effective length of the screw to optimize compression efficiency; reducing radial unbalanced forces and improving component life; and also significantly reducing operating noise.

The overall design of the air compressor is highly efficient and integrated: independent air filter inlet duct, which directly inhales colder air from the outside, making the suction density higher and improving the efficiency of the entire machine. At the same time, the low-noise flow channel design effectively reduces the noise generated by suction. The intake valve integrates functions such as checkback, oil cutoff, and capacity adjustment. The low pressure drop design makes the air intake efficiency better. It can automatically adjust as the actual compressed air demand changes during work, and the control of the empty pressure is more precise, efficient and energy-saving. ​

Independent bearing lubrication does not rely on the oil vapor in the secondary oil return pipe to lubricate the bearings. The bearing lubrication uses an independent lubrication pipeline. Equipped with a separate oil filter to ensure the cleanliness of the lubricating oil.

Efficient and easy-to-maintain oil and gas separation system. The enlarged oil and fine separator design makes the oil and gas separation area larger. While having better filtration effect, it also reduces the pressure drop generated during the oil and gas separation process, making the entire air compressed. The system is more efficient. The oil and gas barrel cover adopts a rotating shaft design, which makes replacing the oil fine separator very simple.

Using a centrifugal fan, the cooling method is changed from forced exhaust cooling to suction cooling, which significantly reduces operating noise. The heavy-duty heat exchanger has a large heat exchange area. The cooler directly inhales cooler air from outside the unit to cool the oil and air, and forces the hot air directly out from the top of the unit for better cooling effect. The centrifugal fan's suction hole located inside the body discharges hot air directly, keeping the temperature inside the air compressor always low. When cleaning the air-cooled cooler, you only need to remove the cover plate without disassembling the air guide cover.

model	(KW/HP) Power	Exhaust pressure (MPa)	exhaust volume (m3/min)	Overall dimensions (mm) Size(LXWXH)	Connection size Inch	net weight (kg)
U45PM-2S	45	0.6	11.84	2200*1230*1700	G2"	1350
		0.7	11.42
		0.8	10.54
		1.0	9.38
U55PM-2S	55	0.6	14.26	2200*1320*1700	G2"	1550
		0.7	13.78
		0.8	11.69
		1.0	11.73
U75PM-2S	75	0.6	20.27	2200*1430*1700	DN80	2100
		0.7	18.92
		0.8	17.70
		1.0	14.24
U90PM-2S	90	0.6	23.67	2700*1650*1850	DN80	2700
		0.7	22.46
		0.8	21.50
		1.0	19.38
U110PM-2S	110	0.6	26.77	2700*1650*1850	DN80	2900
		0.7	26.60
		0.8	25.27
		1.0	21.37
U132PM-2S	132	0.6	32.26	3410*1620*1960	DN100	4200
		0.7	30.38
		0.8	29.06
		1.0	25.80
U160PM-2S	160	0.6	39.15	3910*1610*1920	DN100	4345
		0.7	37.10
		0.8	35.60
		1.0	32.20
U185PM-2S	185	0.6	39.64	3510*1910*2010	DN125	4800
		0.7	39.43
		0.8	39.30
		1.0	38.59
U200PM-2S	200	0.6	46.20	3510*1910*2010	DN125	6500
		0.7	43.56
		0.8	42.13
		1.0	36.28
U250PM-2S	250	0.6	/	4210*2110*2210	DN125	7500
		0.7	55.60
		0.8	53.50
		1.0	45.20
U315PM-2S	315	0.6	/	4210*2110*2210	DN125	8200
		0.7	69.10
		0.8	66.20
		1.0	60.20
U355PM-2S	355	0.6	/	4210*2110*2210	DN125	8500
		0.7	76.95
		0.8	74.80
		1.0	66.20

 

Introduction to two-stage screw air compressor accessories

 

1. The high-efficiency aluminum plate-fin heat exchanger is designed with a maximum temperature of 230°C.

2. Strong permeability, good heat transfer performance, improved "temperature and pressure" to reduce energy consumption.

2. The unique fin structure increases the secondary heat exchange area, promotes turbulence, and improves the heat transfer coefficient.

3. The heat exchange area is 30% larger than the standard in the same industry, with a large margin, which improves the heat transfer coefficient and achieves the optimal cooling effect.

4. Achieve the best state of the cooling and lubrication system

5. Easy to clean.

6. Designed to reduce the temperature of super coolant, which can optimize the operating status of vacuum pump components and extend the life of the machine.

7. Efficient cooling capacity to improve operating efficiency

8. Adequate redundant design allows the system to operate normally at the maximum ambient temperature of 43°C

9. Use a temperature control valve to control the temperature of the lubricating oil entering the main engine.

1. Integrated functions of temperature control valve and oil filter seat

2. Ensure the smooth flow of super coolant inside the system

3. The temperature control valve controls the temperature of the exhaust system within a suitable range.

4. Control the oil temperature to not be lower than the ambient temperature +40°C to prevent water vapor in the oil-gas mixture from escaping and causing emulsification of the coolant.

5. The temperature sensing element automatically controls the proportion of coolant entering the cooler and bypassing according to the exhaust temperature to achieve the purpose of temperature control.

6. Keep the temperature of the coolant in the optimal range and extend the service life of the coolant.

7. Easy to install and maintain

8. Simplify pipelines, reduce joints, and reduce pressure loss and oil and gas leakage probability

Two-stage dust removal, diversion swirling and filter card slot design. Ordinary air filter accuracy: 3um

Heavy-duty nano air filter precision: 1um, and suitable for heavy dust environments

1. Eliminate the traditional PLC control scheme and have built-in dual PID control for pressure and temperature, making the control more intelligent.

2. High-performance air compressor-specific touch screen, high-end image, sensitive touch response, adaptive vacuum pump control program, easy to operate.

3. Advanced vector control algorithm optimizes product adaptability while adjusting the best performance output to improve system operation reliability; the frequency converter is compatible with permanent magnet motor control.

4. Reliability and safety protection: For various harsh application situations of vacuum pumps, it provides a high overload service coefficient, configures EMC filters, and sets up a variety of early warning and protection functions to reduce the probability of failure during user use.

1. All models use IE4 level (GB1 energy efficiency) ultra-efficient motors;

2. IP55 protection level.

3. The motor windings and magnets are in a closed and clean space to avoid contamination and demagnetization;

4. All motors adopt SmCo magnet design, with higher demagnetization temperature and more reliable product quality.

5. All motors have winding temperature sensors to monitor the internal temperature of the motor in real time, with high temperature warning and trip protection.

 

Two-stage air compressor, also known as two-stage compression screw air compressor, refers to a device that compresses air or gas to high pressure. Unlike traditional single-stage compressors, two-stage compressors use two compressor stages to compress the gas separately for primary and final compression. The working principle is: after the air is compressed in one stage, it is cooled by the interstage spray curtain of two-stage compression, which reduces the suction temperature of the second-stage compression, making the compression process tend to be isothermal compression. Compared with single-stage compression, in principle, two-stage compression saves 5~8% energy compared with single-stage compression. The two-stage air compressor has an integrated upper and lower design. There is no pipeline connection between stages. The structure is compact and the pressure loss is small, which also guarantees the energy saving of the whole machine. Two-stage compressors can provide more efficient compression, higher pressures and larger flows and are widely used in industrial, manufacturing and production processes.

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