China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen

Product Description

Product Description

Product features of low pressure screw air compressor:

1. Adopt large rotor and low speed to ensure the high performance of the machine;
2. Increase oil and gas separation equipment to ensure that the export oil content is ≤3ppm;
3. The air source of the low-pressure screw air compressor is clean, which reduces the number of cleaning nozzles of texturing machines and other equipment, and improves the quality of the finished product;
4. The heat dissipation area of the oil cooler is increased by more than 30% to ensure normal operation in summer without over-temperature;
5. Independently design the internal pressure ratio of the host to ensure a better specific power;
6. Intelligent control system, automatically adjust the exhaust volume according to the customer’s usage (frequency conversion model).
7. For the texturing industry, ensure long-term continuous operation, set fault warnings, and do not stop immediately, so that customers are fully prepared for shutdown;
8.  Adopting dual air outlet design, the air outlet temperature can be adjusted according to climate changes, meeting customer needs to a greater extent, and achieving high efficiency and energy saving at the same time.

1. Efficient airend
There is no intermediate transmission, so there is no energy loss; direct drive increases reliability and reduces maintenance costs; large rotors run at low speeds, with higher efficiency, lower noise, lower vibration, and lower energy consumption.

2. High-quality independent oil pump forced lubrication design
(1) Forced lubrication with independent oil pump;
(2) Ensure that there is sufficient fuel injection and a better air-fuel mixture ratio under extremely low exhaust pressure (2kg).

3. Increase customized oil and gas separation system
Increase the customized oil and gas separation system to ensure the ultimate oil and gas separation effect and ensure that the oil content of the air is less than 3ppm.

Product Parameters

Low-pressure permanent magnet variable frequency air compressor parameters:

Model Volume flow(m3/min) Pressure(Mpa/bar) Power(kW) Noise(DB) Outlet diameter Dimension(mm) Weight(kg)
DHH37LM 10.0 0.3/3 37 65 G2 2000*1120*1590 1180
9.6 0.4/4
8 0.5/5
DHH45LM 15.1 0.2/2 45 65 G2 2100*1677*1892 2500
12.2 0.4/4
9.3 0.5/5
DHH55LM 22 0.2/2 55 70 DN150 2800*1860*1900 3200
15.61 0.3/3 DN100 2100*1677*1892 2600
15.48 0.4/4
12.00 0.5/5
DHH75LMH 29.5 0.2/2 75 70 DN150 2800*1860*1900 3200
21.5 0.3/3
21.0 0.4/4
16.1 0.5/5 DN65 2400*1630*1980 1850
DHH90LMH 31.0 0.2/2 90 72 DN150 2800*1860*1900 3300
28.8 0.3/3
21.0 0.5/5
DHH110LMH 37.0 0.2/2 110 72 DN200 2900*2100*2150 4800
33.0 0.3/3
28.5 0.4/4
DHH132LMH 47 0.2/2 132 78 DN200 2900*2100*2150 4950
43.8 0.3/3
32.5 0.4/4
28.3 0.5/5 DN80 2800*1828*2150 3600
DHH160LMH 55.7 0.2/2 160 78 DN300 4500*2200*2200 6800
49.4 03/3 DN200 2900*2100*2150 5100
43.0 0.4/4
DHH185LMH 60.0 0.3/3 185 78 DN200 4500*2200*2200 6900
43.0 0.5/5

Parameters of two-stage low-pressure screw air compressor:

Model Volume flow(m3/min) Power(kW) Noise(DB) Outlet diameter Dimension(mm) Weight(kg)
0.45~0.5mpa 0.55mpa
DHH30LDM 7.06 6.95 30 68 G2 1600*1060*1470 1338
DHH37LDM 10.0 9.20 37 68 G2 1600*1060*1470 1438
DHH45LDM 11.98 11.65 45 70 DN65 2400*1630*1980 1734
DHH55LDM 15.57 15.48 55 70 DN65 2400*1630*1980 1980
DHH75LDM 18.51 18.32 75 72 DN65 2400*1630*1980 2080
DHH90LDM 22.92 22.51 90 72 DN80 2800*1828*2150 4700
DHH110LDM 26.81 26.11 110 72 DN80 2800*1828*2150 4850
DHH132LDM 32.5 31.98 132 78 DN80 2800*1828*2150 4850
DHH160LDM 41.11 40.68 160 78 DN100 3000*1900*2190 5000
DHH185LDM 43.88 43.52 185 78 DN100 4360*2150*2258 7200
DHH220LDM 55.31 55.06 220 80 DN200 4360*2150*2258 7200
DHH250LDM 60.31 60.12 250 80 DN200 4360*2150*2258 7500


Company Profile

We’re professional compressor factory since 1996. Germany Standard and 13 years exporting experience help us won more than 50 loyal foreign agents. 

Our products line are complete,main products as below.
1. Ordinary fixed speed air compressor

2. Energy saving series:
VSD screw air compressor
Permanent magnet VSD screw air compressor
Double stage PM VSD screw air compressor

3. Oil free series:
Oil free water lube screw air compressor
Dry oil free type
Oil free scroll type

4. Low pressure series:
3-5bar, main for textile industry
0.4-1.5 bar,main for waste water treatment

5. 16bar-30bar special for laser cutting industry

6. After-treat equipment
Refrigerated air dryer
Desiccant air dryer
High efficiency pipeline filter

And all the compressor parts.

Packaging & Shipping

Why choose us


Q1. Are you trading company or manufacture ?

A: We are professional manufacture of screw air compressor of HangZhou(Close to ZheJiang ), China, more than 24 years.

Q2. How long is the delivery time ?
A: For standard voltage ,15 working days. Non-standard ,please contact our sales.

Q3. What’s payment term ?
A: T/T, L/C, D/P, Western Union, Paypal, Credit Card, and etc. Also we could accept USD, RMB, Euro and other currency.

Q4. How about your after-sales service ?
A: 1.Provide customers with installation and commissioning online instructions.
  2. Well-trained engineers available to overseas service.
  3.Worldwide agents and after service avaiable.arrange our engineers to help you training and installation.

Q5. How about your warranty?
A: One year for the whole machine and 2 years for screw air end, except consumable spare parts.

Q6. Do you have any certificate ?
A: Yes, per different customer’s market need ,we can offer CE ,ISO etc certificate.

Q7. What about the maintenance ?
A: First maintenance need to be done after 500Hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.

Q8. How do you control quality ?
A: 1.The raw materials are strictly inspected
      2. Some key parts are imported from overseas
      3.Each compressor must pass at least 5 hours of continuous testing before leaving the factory.

Q9. Do you offer OEM service ?
A: Yes.Both OEM & ODM service can be accepted.

Q10.How long could your air compressor be used?
A: Generally, more than 10 years.

How to Choose the Right Air Compressor

An air compressor uses pressurized air to power a variety of tools. They are most commonly used to power nailers and impact wrenches. Other popular uses for air compressors include paint sprayers and impact wrenches. While all air compressors have the same basic construction, their specialty differs. Ultimately, their differences come down to the amount of air they can push. Read on for information on each type of air compressor. These tools are great for many different purposes, and choosing the right air compressor depends on your specific needs.

Electric motor

While purchasing an electric motor for air compressor, compatibility is a key factor. Not all motors work with the same type of air compressor, so it’s important to check the manufacturer’s instructions before purchasing. By doing this, you can avoid wasting money on an incompatible motor. Another important consideration is speed. A motor’s speed is its rate of rotation, measured in revolutions per minute. It is critical that you purchase a motor with sufficient speed to meet the needs of your air compressor.
Typically, an electric motor for air compressor is 1.5 hp. It is ideal for use with medical equipment and metal-cutting machines. It also performs well under continuous operation and offers a high efficiency and energy-saving performance. Moreover, it features an attractive price, making it a good choice for a wide range of applications. If you are looking for a motor for an air compressor, look no further than a ZYS series.
A motor’s protection class indicates how the motor will operate. Protection classes are specified by the IEC 60034-5. These are stated with 2 digits and represent the protection against solid objects and water. For example, an IP23 rating means that the motor will be protected from solid objects, while IP54 means that it will protect from dust and water sprayed from all directions. It is vital to choose a motor with the correct protection class for your air compressor.
When choosing an electric motor, you should consider whether it’s compatible with the brand of air compressor. Some may be compatible, while others may require advanced electronics skills to repair. However, most air compressors are covered by warranty, so it’s important to check with the manufacturer if the warranty is still in effect before you spend a dime on a replacement. The motor should be replaced if it has failed to perform as designed.

Oil bath

Air compressors require proper lubrication to function efficiently. The piston must draw air with minimal friction. Depending on their design, air compressors can either be oil-lubricated or oil-free. The former uses oil to reduce piston friction, while the latter splashes it on the cylinder bearings and walls. Such air compressors are commonly known as oil-flooded air compressors. In order to keep their oil baths clean, they are recommended for use in locations with high dust levels.

Start/stop control

An air compressor can be controlled by a start/stop control. This type of control sends a signal to the main motor that activates the compressor when the demand for air falls below a preset limit. This control strategy is effective for smaller air compressors and can be useful for reducing energy costs. Start/stop control is most effective in applications where air pressure does not change frequently and where the compressor is not required to run continuously.
To troubleshoot this problem, you need to check the power supply of your compressor. To check the supply side, use a voltage monitor to determine if power is flowing to the compressor. Ensure that the power supply to the compressor is steady and stable at all times. If it fluctuates, the compressor may not start or stop as expected. If you cannot find the problem with the air compressor power supply, it may be time to replace it.
In addition to the start/stop control, you may want to purchase additional air receivers for your air compressor. These can increase the capacity of air stored and reduce the number of times it starts and stops. Another way to decrease the number of starts per hour is to add more air receivers. Then, you can adjust the control to match your requirements. You can also install a pressure gauge that monitors the compressor’s performance.
Start/stop control for air compressors can be complex, but the basic components are relatively easy to understand. One way to test them is to turn the compressor on or off. It is usually located on the exterior of the motor. If you’re unsure of the location of these components, check the capacitors and make sure that the air compressor is not running while you’re not using it. If it does, try to remove the capacitor.
Variable displacement control is another way to adjust the amount of air flowing into the compressor. By controlling the amount of air, the control can delay the use of additional compressors until more required air is available. In addition to this, the device can also monitor the energy used in the compressor. This control method can result in substantial energy savings. You can even save on the amount of electricity by using variable displacement control. It is essential for efficient compressed air systems.

Variable speed drive

A VFD, or variable frequency drive, is a type of electric motor that adjusts its speed to match the demand for air. It is an efficient way to reduce energy costs and improve system reliability. In fact, studies have shown that a 20% reduction in motor speed can save up to 50% of energy. In addition, a VFD can monitor additional variables such as compressor oil pressure and motor temperature. By eliminating manual checks, a VFD will improve the performance of the application and reduce operating costs.
In addition to reducing energy costs, variable-speed drives also increase productivity. A variable-speed air compressor reduces the risk of system leaks by 30 percent. It also reduces the risk of system leaks by reducing pressure in the system. Because of these advantages, many governments are promoting this technology in their industries. Many even offer incentives to help companies upgrade to variable-speed drives. Therefore, the variable-speed drive can benefit many air compressor installations.
One major benefit of a variable-speed drive is its ability to optimize energy use. Variable frequency drives are able to ramp up and down to match the demand for air. The goal is to optimize the pressure and flow in the system so that the best “dead band” occurs between 40 percent and 80 percent of full load. A variable-speed compressor will also increase energy efficiency because of its programmability.
A variable-speed air compressor can also be used to control the amount of air that is compressed by the system. This feature adjusts the frequency of power supplied to the motor based on the demand. If the demand for air is low, the frequency of the motor will reduce to save energy. On the other hand, if there is an excess demand for air, the variable-speed compressor will increase its speed. In addition, this type of air compressor is more efficient than its fixed-speed counterpart.
A VFD has many benefits for compressed air systems. First, it helps stabilize the pressure in the pipe network, thereby reducing the power losses due to upstream pressure. It also helps reduce the power consumption caused by fluctuations in upward pressure. Its benefits are also far-reaching. And as long as the air pressure and air supply is properly sized, a VFD will help optimize the efficiency of compressed air systems.

China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen  China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen

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