China wholesaler High-Performance-Price Ratio Dry Oil-Free Screw Vacuum Pump Lgv-250 supplier

Product Description


Product Description

The dry screw vacuum pump is a rotor that uses a pair of parallel screws to make synchronous, high-speed and reverse rotation in the pump housing. The rotor and the inner wall of the pump body form a number of sealing spaces. During the rotation, the continuous transmission of gas is formed to achieve the purpose of suction and exhaust.

The screw vacuum pump has a simple structure, but its processing technology requires higher requirements. It must ensure that the height between rotors is parallel, and that between rotors and between rotors and the inner wall of the pump body, there is a very small gap and no friction caused by contact, so as to ensure the realization of gas transmission and reduce gas backflow without the need for oil lubrication and sealing.
This requires that the entire product must be the highest standard from material selection to processing. Because the clearance between components is required to be very small, it is necessary to ensure that the screw and pump body materials are not easy to deform, especially when the temperature changes to a certain value, the locking phenomenon cannot occur due to deformation. Special material treatment shall be selected to ensure the fine processing of all parts. In addition to the fine processing of the 2 screws, dynamic balance correction shall be carried out. The shaft end bearing must be a high-quality special bearing, which not only ensures the parallelism of the screw rotor and is not prone to slight displacement, but also ensures smooth rotation and is not affected by temperature and other factors. When the vacuum pump is working, the clearance between them is small without friction, the operation is stable, the vibration is small, the noise is low, the energy is saved, and the service life is extended. The special screw structure can continuously promote the air flow without compression. The exhaust port is lower than the screw position, the liquid discharge capacity is strong, and it is easy to clean. The pump cavity has short channels, no partitions, and the exhaust and discharge are smooth, so the working efficiency is high, the suction is super strong, and the limit vacuum degree of the pump is greatly improved, It can provide high vacuum ≤ 5Pa or even close to 1Pa; There is no lubrication and pollution in the working chamber, which can provide a clean vacuum without worrying about backflow pollution. Extracts can also be directly recycled or discharged without environmental pressure. Elaborate design, simple structure and precise processing make it more convenient to use and easier to maintain, which is favored by many industry users. It is widely used, not only to extract condensable gas, but also to extract gas containing a large amount of water vapor and a small amount of dust. The specially treated overflow surface can also be used to extract certain corrosive gas, and it is also a special product for oil and gas recovery, solvent recovery, special gas recovery and other industries.

 It adopts explosion-proof motor with high configuration, It has the characteristics of low noise, no oil and pollution, clean and high vacuum, simple and convenient use, operation and maintenance, Widely used in many industries, For example, oil and gas recovery, vacuum coating, biomedicine, food processing, single crystal furnace, vacuum forming, vacuum melting, electronic photovoltaic, semiconductor synthesis and many other industries are used.
The dry oil-free screw vacuum pump produced by our company is divided into air cooling and water cooling according to the extraction rate, and there are many models for you to choose.

Our Advantages

There is no medium in the working chamber, which can obtain a clean vacuum.
. No clearance between rotating parts, high speed operation, small overall volume.

There is no compression in the gas, suitable for extraction of coagulable gas.

Can remove a lot of steam and a small amount of dust gas occasions.
. High vacuum, the ultimate vacuum up to 1 Pa.

Screw material is high strength special material, material density, wear resistance, stable performance.

No friction rotating parts, low noise.
. Simple structure, convenient maintenance.
Wider range of use: corrosive environment can be used.

No oil consumption, no water.

Pump gas directly discharged from the pump body, no pollution of water, no environmental pressure, more convenient gas recovery.

It can be composed of oil-free unit with Roots pump and molecular pump.


Typical Use

——Oil and gas recovery.    ——Biological medicine ——Food Processing —— Single crystal furnace
——Vacuum forming ——Vacuum flame refining ——Electronic photovoltaic. ——Semiconductor synthesis

Product Parameters

 Air cooling    Dry screw vacuum pump

(Air cooled series)
                                                                            Basic parameters 
Pumping speed
Presure limit(Pa)  Power (kW)  revolution (rpm) Inlet caliber
outlet caliber (mm) Pump head weight
noise dB(A) Overall dimension
LG-10 10 ≤5 0.75 2730 KF16 KF16 2 ≤ 72 655x260x285
LG-20 20 ≤5 1.1 2840 KF25 KF25 5.5 ≤72 720x305x370
LG-50 50 ≤10 2.2 2850 KF40 KF40 4 ≤75 920x350x420
LG-70 70 ≤30 3 2850 KF40 KF40 8 ≤75 910x390x460
LG-90 90 ≤30 4 2870 KF50 KF50 10 ≤80 1000x410x495

Water cooling Dry screw vacuum pump


Type                                                                             Basic parameters
Pumping speed
Presure limit(Pa)  Power (kW)  revolution (rpm) Inlet caliber
outlet caliber mm Cooling water volume
noise dB(A) Overall dimension
LGV-180 180 5 4 2900 40 40 2 < 78 1157x375x734
LGV-250 250 5 5.5 2900 50 40 5.5 <78 1462x417x820
LGV-360 360 5 7.5 2900 50 40 4 W78 1462x455x820
LGV-540 540 5 11 2900 65 50 8 W80 1578x543x860
LGV-720 720 5 15 2900 80 65 10 <80 1623x562x916
LGV-1100 1100 5 22 2900 100 80 14 w 80 1866x598x1050
LG V-1800 1800 5 37 2900 150 100 20 w 80 2092×951 x 1150

Characteristic Curve

 Air cooling   Dry screw vacuum pump

Water cooling Dry screw vacuum pump

Detailed Photos


Vacuum pumps are used in oiling machines

General Manager Speech

Deeply cultivate the vacuum technology, and research,develop and manufacture the vacuum equipment to provide the best solution in the vacuum field and make the vacuum application easier.

Company Profile

ZheJiang Kaien Vacuum Technology Co., Ltd. is a high-tech enterprise integrating R & D, production and operation of vacuum equipment. The company has strong technical force, excellent equipment and considerate after-sales service. The product manufacturing process is managed in strict accordance with IS09001 quality system. It mainly produces and sells screw vacuum pump, roots pump, claw vacuum pump, runoff vacuum pump, scroll pump, water ring vacuum pump, vacuum unit and other vacuum systems.

New plant plHangZhou

The company’s products have been for a number of food, medicine, refrigeration, drying plants and a number of transformer related equipment manufacturers for vacuum equipment. The products are widely used in vacuum drying and dehydration, kerosene vapor phase drying, vacuum impregnation, vacuum metallurgy, vacuum coating, vacuum evaporation, vacuum concentration, oil and gas recovery, etc.

High precision machining equipment

The company cooperates with many scientific research institutions and universities, such as ZheJiang University, China University of petroleum, ZheJiang Institute of mechanical design, etc.with colleges and universities to research and develop core technologies, and owns dozens of independent intellectual property patents.Our technology is leading, the product quality is stable, the product has a good reputation in China’s domestic market, is sold all over the country, and is exported to Europe, America, Africa, the Middle East and Southeast Asia,We adhering to the basic tenet of quality, reputation and service, the company takes leading-edge technology of vacuum pump as its own responsibility, and wholeheartedly serves customers of vacuum equipment application in various industries with rigorous working attitude and professional working style.

  Product quality wins consumer cooperation

In shipmentISO9001 High tech enterprise certificate

Welcome to send your needs, we will provide you with the best service,

provide the greatest help!!!  


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Warranty: One Year
Oil or Not: Oil Free
Structure: Screw
Exhauster Method: Entrapment Vacuum Pump
Vacuum Degree: High Vacuum
Work Function: Mainsuction Pump


screw vane pump

Are there environmentally friendly options for screw vacuum pumps?

Yes, there are environmentally friendly options available for screw vacuum pumps. Here’s a detailed explanation of the eco-friendly features and considerations associated with screw vacuum pumps:

1. Oil-Free Operation:

One of the key environmentally friendly features of screw vacuum pumps is their ability to operate without the use of oil. Traditional vacuum pumps, such as rotary vane pumps or liquid ring pumps, often require oil for lubrication and sealing. However, oil-free screw vacuum pumps eliminate the need for oil, resulting in cleaner and more environmentally friendly operation. Oil-free pumps can be particularly beneficial in applications where the pumped gases come into direct contact with the process or need to remain free from oil contamination.

2. Reduced Emissions:

Screw vacuum pumps contribute to reduced emissions compared to certain other types of pumps. By eliminating oil from the operation, there is no risk of oil carryover or vapor emissions that could adversely affect the environment. This is especially important in applications where the pumped gases contain volatile compounds, as oil-free screw vacuum pumps help prevent the release of harmful substances into the atmosphere. Additionally, screw vacuum pumps with built-in gas and vapor ballast options can further reduce emissions by facilitating the extraction of condensable vapors and preventing their release into the environment.

3. Energy Efficiency:

Energy efficiency is a crucial factor in environmentally friendly operation. Screw vacuum pumps are known for their high efficiency, which translates into reduced energy consumption. By minimizing power requirements, energy-efficient screw vacuum pumps help conserve energy and lower greenhouse gas emissions. Choosing pumps with advanced control systems, variable speed drives, or frequency converters can further enhance energy efficiency by allowing precise control and optimization of pump performance based on demand.

4. Noise Reduction:

Screw vacuum pumps often have quieter operation compared to certain other types of pumps. The design of screw pumps, with balanced rotors and reduced internal clearances, helps minimize noise and vibration. Reduced noise levels not only contribute to a more comfortable and quieter working environment but also have positive environmental implications by minimizing noise pollution in surrounding areas.

5. Long Service Life and Durability:

Screw vacuum pumps are typically built with durable materials and have a robust design, resulting in a long service life. Prolonged equipment lifespan reduces the need for frequent replacements, minimizing waste generation and the environmental impact of manufacturing new pumps. Additionally, the durability of screw vacuum pumps translates into fewer maintenance requirements and less material consumption over time.

6. Waste Management:

When it comes to waste management, screw vacuum pumps offer advantages such as reduced oil disposal requirements. Unlike oil-sealed pumps that require regular oil changes and proper disposal of used oil, oil-free screw vacuum pumps eliminate this waste stream. This simplifies waste management processes and reduces the potential environmental hazards associated with oil handling and disposal.

7. Compliance with Environmental Regulations:

Many screw vacuum pump manufacturers prioritize environmental responsibility and design their products to comply with relevant environmental regulations and standards. These may include requirements for energy efficiency, emissions control, noise levels, and material restrictions. By choosing pumps from reputable manufacturers that prioritize environmental considerations, users can ensure the equipment meets or exceeds the necessary environmental compliance requirements.

In summary, environmentally friendly options for screw vacuum pumps include oil-free operation, reduced emissions, energy efficiency, noise reduction, long service life and durability, waste management advantages, and compliance with environmental regulations. By opting for these eco-friendly features, industries can minimize their environmental footprint and contribute to sustainable practices.

screw vane pump

How do you select the right size and capacity of a screw vacuum pump for specific applications?

When selecting the right size and capacity of a screw vacuum pump for specific applications, several factors need to be considered. Here’s a detailed explanation of the key considerations:

1. Required Vacuum Level:

Determine the desired vacuum level needed for the application. Different applications have varying requirements for vacuum levels, ranging from low vacuum to high vacuum. The selected screw vacuum pump should be capable of achieving and maintaining the required vacuum level throughout the process.

2. Gas Load and Flow Rate:

Assess the gas load and flow rate of the application. The gas load refers to the volume or mass of gas to be evacuated, while the flow rate is the rate at which the gas needs to be pumped. Consider factors such as the type of gas or vapor, its composition, and the required evacuation time. This information helps determine the pumping speed and capacity required from the screw vacuum pump.

3. Process Conditions:

Take into account the process conditions, including the temperature and pressure at the inlet and outlet of the pump. The screw vacuum pump should be capable of handling the process conditions without compromising its performance or reliability. Consider factors such as the presence of corrosive gases, high temperatures, or particulate matter that may require special material selection or additional accessories.

4. System Leakage and Conductance:

Evaluate the system leakage and conductance. System leakage refers to any unintended gas leakage points within the vacuum system, which can affect the pump’s performance. Conductance refers to the ability of the system to conduct gas flow and is influenced by factors such as the diameter and length of the piping, presence of valves or restrictions, and the configuration of the system. Properly accounting for system leakage and conductance ensures that the selected screw vacuum pump can handle the overall system requirements.

5. Safety Factors and Future Expansion:

Consider safety factors and future expansion needs. It is advisable to select a screw vacuum pump with a slightly higher capacity than the calculated requirements to account for any unexpected variations or future expansion of the process. This provides a safety margin and ensures that the pump can handle any potential increases in gas load or system demands.

6. Manufacturer’s Specifications and Expert Advice:

Refer to the manufacturer’s specifications, technical data, and performance curves of different screw vacuum pump models. These specifications provide information about the pumping speed, ultimate vacuum, power requirements, and other relevant parameters. Additionally, consult with experts or manufacturers to get their recommendations based on their expertise and experience in the field.

7. Cost Considerations:

Take into account the cost considerations associated with the selected screw vacuum pump, including the initial investment, operational costs, maintenance requirements, and the overall cost-effectiveness for the specific application. Assess the long-term value and return on investment (ROI) provided by the selected pump.

In summary, selecting the right size and capacity of a screw vacuum pump involves considering the required vacuum level, gas load and flow rate, process conditions, system leakage and conductance, safety factors and future expansion, manufacturer’s specifications, and cost considerations. By carefully evaluating these factors and consulting with experts, it is possible to choose a screw vacuum pump that meets the specific requirements of the application, ensuring efficient and reliable vacuum performance.

screw vane pump

What is a screw vacuum pump, and how does it operate?

A screw vacuum pump is a type of positive displacement vacuum pump that utilizes two or more intermeshing screws to create a vacuum by trapping and transporting gas or vapor from the inlet to the outlet of the pump. It operates based on the principle of volumetric compression.

The basic components of a screw vacuum pump include rotors (screws), a housing, and inlet and outlet ports. The rotors are typically helical in shape and have precise screw profiles. They are mounted on parallel shafts within the pump housing. As the rotors rotate, the intermeshing screws create sealed cavities or “pockets” between the rotor lobes and the housing.

The operation of a screw vacuum pump typically involves the following steps:

  1. Inlet Stage: At the beginning of the pump cycle, the rotors start rotating. As the cavity between the rotor lobes and the housing passes the inlet port, gas or vapor is drawn into the cavity. The volume of the cavity expands, creating a low-pressure zone at the inlet.
  2. Compression Stage: As the rotors continue to rotate, the cavity moves towards the outlet port, gradually reducing its volume. This reduction in volume compresses the gas or vapor trapped within the cavity, causing its pressure to increase.
  3. Outlet Stage: Finally, when the cavity reaches the outlet port, the compressed gas or vapor is discharged from the pump, and the cycle repeats.

It is important to note that screw vacuum pumps can operate with either dry or liquid seals. Dry screw vacuum pumps rely on tight clearances between the rotors and the housing to create an effective seal, while liquid-sealed screw vacuum pumps use a liquid sealant to prevent gas leakage and provide lubrication between the rotor surfaces.

Screw vacuum pumps offer several advantages in various applications:

  • High Efficiency: Screw vacuum pumps can achieve high volumetric efficiency due to their positive displacement design, enabling them to handle large volumes of gas or vapor efficiently.
  • Continuous Operation: These pumps are capable of continuous operation, making them suitable for demanding industrial processes requiring sustained vacuum levels.
  • Reliability: Screw vacuum pumps are known for their reliability and robust construction, making them suitable for harsh operating conditions.
  • Low Noise Levels: Compared to other types of vacuum pumps, screw vacuum pumps often produce lower noise levels during operation.
  • Wide Range of Applications: Screw vacuum pumps find applications in various industries, including chemical processing, pharmaceuticals, food and beverage, wastewater treatment, and more.

In summary, a screw vacuum pump is a positive displacement pump that utilizes intermeshing screws to create a vacuum by trapping and compressing gas or vapor. Its operation involves drawing gas into the cavity, compressing it, and then discharging it. Screw vacuum pumps offer high efficiency, reliability, and suitability for a wide range of applications, making them a popular choice in many industries.

China wholesaler High-Performance-Price Ratio Dry Oil-Free Screw Vacuum Pump Lgv-250   supplier China wholesaler High-Performance-Price Ratio Dry Oil-Free Screw Vacuum Pump Lgv-250   supplier
editor by CX 2024-04-02