INNOVATIVE DRY VACUUM PUMPS

In recent years, with the continuous deterioration of the global environment, higher requirements have been put forward for various industrial production equipment. Dry vacuum pumps have gradually begun to replace traditional oil-based and water-based vacuum pumps in various industrial fields.

• Features of dry vacuum pump:
• 1. Obtaining a vacuum does not consume water or oil.
• 2. No waste water or gas emissions are produced
• 3. The power consumption is half of that of traditional vacuum pumps
• 4. Long service life and low maintenance cost

Dry vacuum pumps are the perfect vacuum obtaining equipment from both environmental and usage perspectives.

What is a dry screw vacuum pump

The dry screw vacuum pump is a product with very high technology. It is mainly used in high-purity vacuum processes. It has an extremely high vacuum and can adapt to harsh working conditions. It has the ability to extract condensable and particulate gases and is especially suitable for electronics, chemical engineering and biomedicine and other fields.

Dry screw vacuum pump is an air extraction device that uses a pair of screws to perform synchronous high-speed reverse rotation in the pump casing to produce air suction and exhaust. The two screws are finely dynamically balanced and supported by bearings. They are installed in the pump case, and there is a certain gap between the screws. Therefore, when the pump works, there is no friction between each other, smooth operation, low noise, and no lubricating oil is required in the working chamber. Therefore, the dry screw pump can pump out a large amount of water vapor and gas with a small amount of dust, the ultimate vacuum is higher, the power consumption is lower, and it has the advantages of energy saving and maintenance-free. It is an updated product of the oil-sealed vacuum pump.

The screw rotor, the core part of the screw vacuum pump, is designed and solved using a three-dimensional surface mathematical model. The entity of the model is processed on a five-coordinate linkage CNC equipment. It has high precision, reliable quality and stable performance, ensuring long-term trouble-free operation of the product. 

It will be used in chemical industry, metallurgy, electronics, petroleum, aerospace, tools, papermaking, and packaging. , food, medicine, medical equipment, as well as information engineering, bioengineering, microelectronics and other more than 100 fields to comprehensively replace the current low-tech vacuum equipment.

Types of Traditional Dry Screw Vacuum Pumps

Jet Type Vacuum Pump

Water Type Vacuum Pump

If a dry vacuum pump experiences high maintenance or damage, such as corrosion problems, rotor stuck, seal failure, etc., most of the reasons are caused by the product material and structural design, rather than improper use by the user. Based on many years of vacuum application experience in many fields, Chnic company has designed a dry vacuum pump product structure to improve the durability of dry vacuum pumps.

Before making a choice, it is very necessary for users to understand the detailed introduction of our product structure, materials and seals, and make the most appropriate selection to match the working conditions and process, and improve the stability of equipment operation. Through the special design of our products, we are able to achieve excellent durability of dry vacuum pumps in all working conditions.

What are the advantages of dry screw vacuum pumps over traditional vacuum pumps?

Dry screw vacuum pumps have the following advantages over traditional vacuum pumps:

1. Oil-free design: Dry screw vacuum pumps do not require the use of oil for sealing, thus avoiding the problem of oil pollution and are suitable for some applications that are sensitive to oil pollution.

2. High efficiency and energy saving: The dry screw vacuum pump adopts non-contact operation, with small mechanical loss and high power transmission efficiency, so it has higher efficiency and lower energy consumption.

3. Low maintenance costs: Due to the oil-free design, dry screw vacuum pumps do not require regular oil replacement, so maintenance costs are low.

4. Wide range of applications: Dry screw vacuum pumps can be used for the extraction and processing of high-purity gases, flammable and explosive gases, corrosive gases and other gases.

It should be noted that the price of dry screw vacuum pump is higher than that of traditional vacuum pump, and its performance under high vacuum degree is relatively weak. Therefore, the selection needs to be evaluated based on the specific application and requirements.

Innovative Dry multi-stage screw vacuum pump

The principle and design features of dry screw vacuum pumps produce vacuum

It relies on two screw rotors that are close but not in contact to continuously inhale, squeeze, and discharge gas to form a vacuum;

There is no friction between the two rotors and between the rotor and the pump casing, so no water or oil is needed for sealing and cooling.

1. The replaceable assembly-type universal rotor design facilitates maintenance and reduces the cost of parts replacement for users.

2. The rotor and cavity are available in a variety of materials: ductile cast iron, aluminum alloy, super stainless steel, titanium, and nickel-copper alloy.

These materials can cope with various harsh working conditions, such as strong corrosion, high dust, and multi-solvent media.

3. Fully sealed design, the entire pump has no leakage points and is especially suitable for applications involving toxic gases, flammable gases, radiation and other working conditions.

4. The innovative permanent magnet synchronous motor saves 10% more energy than the national standard first-class energy efficiency motor.

Features of integrated cooling:

1. Both the gearbox and bearing end covers can be cooled, greatly extending the service life of gear oil and bearings.

2. The overall through-cooling of the pump body makes the temperature of the pump body more uniform and controllable, and is suitable for maintaining the stable value of the pump thermal state in various processes. The stronger the cooling, the better. Some processes are prone to condensation corrosion in the pump cavity. Controlled cooling is best.

Technical Parameters

Optional parts material list:

Our company’s dry vacuum pumps can select sealing methods or a combination of multiple sealing methods according to various working conditions.

Case Analysis

Performance comparison: Installing our CN125 dry vacuum pump to replace the 2BV5161 water ring vacuum pump (in a food factory – 2022)

After the replacement, each pump saves more than 100 kilowatt hours of electricity and more than 20 cubic meters of water per day.

APPLICATIONS OF DRY SCREW VACUUM PUMPS

A dry screw vacuum pump is a device used to extract gas. It can extract gas from a closed space to form a vacuum environment. Typically used in the following areas:

Semiconductor industry: Dry screw vacuum pumps can be used to extract residual gases and impurities during wafer manufacturing, thin film deposition and chemical vapor deposition in the semiconductor industry.

Medical and pharmaceutical industry: In the pharmaceutical and medical fields, dry screw vacuum pumps can be used in processes such as sterilization, distillation, freeze-drying and purification to help maintain a highly clean environment and stable pressure.

Solar panels: Dry screw vacuum pumps can be used in the production of solar panels to remove impurities and odors during the production process.

Laboratory scientific research: Dry screw vacuum pumps can also be used in fields such as physics, chemistry, materials, and life sciences, such as in experimental processes such as heat treatment, film deposition, surface analysis, and mass spectrometry.

In short, dry screw vacuum pumps are widely used in many scientific, industrial and medical fields due to their advantages of high efficiency, cleanliness, and low noise.

What are the classifications of dry screw vacuum pumps?

Dry screw vacuum pump consists of pump cover, pump body, disc, impeller, mechanical seal, motor and other parts. The working principle of the dry screw vacuum pump is mainly to use gear transmission to synchronously reversely rotate the intermeshing and non-contact left and right screws to rotate at high speed, and use the pump casing and the intermeshing propeller grooves to divide them into multiple spaces to form multiple spaces. stage, the gas carries out transmission movement in equal grooves,
No compression, only the spiral structure at the end of the screw compresses the gas.
Dry screw vacuum pumps are classified into double circular split type, three-lobed circular split type, external compression screw type, combined type (roots + claw), and internal compression screw type.
There are more and more types of dry screw vacuum pumps. Many domestic vacuum pump manufacturers have focused their main efforts on the research and development and production of dry vacuum pumps. The technology has become more and more advanced, and the dry screw vacuum pumps they produce are used more and more widely. , the price is not as high as before, truly meeting the demand for affordable vacuum pumps.

Working principle and working process of dry screw vacuum pump

The Dry screw vacuum pump, also called screw dry vacuum pump, is an environmentally friendly vacuum pump that is completely oil-free in the pump chamber. It is suitable for a clean working environment and is energy-saving and efficient. Dry screw vacuum pumps have replaced traditional vacuum pumps in more and more industries. The working process of the screw dry vacuum pump can be divided into three processes: suction, compression and exhaust. As the rotor rotates, each pair of intermeshing teeth completes the same working cycle one after another. One pair of teeth is now illustrated.

Inspiratory process

The male rotor rotates counterclockwise, and the female screw rotates clockwise. The upper rotor end face is the suction section, and the lower end face is the exhaust end face.

compression process

The rotor end face is the exhaust end face. Here, the male rotor rotates in the clockwise direction and the female rotor rotates in the counterclockwise direction. The upper rotor end face is the suction section, and the lower end face is the exhaust end face.

exhaust process

In the exhaust process of the screw pump, the exhaust process begins after the volume between the teeth is connected to the exhaust orifice. As the volume between the teeth continues to shrink, the gas with exhaust pressure is gradually exhausted through the exhaust orifice.

Daily maintenance and maintenance methods of oil-free screw vacuum pump

The working principle of the dry screw vacuum pump is mainly to use gear transmission to synchronously reversely rotate the intermeshing and non-contact left and right screws to rotate at high speed, and use the pump casing and the intermeshing propeller grooves to divide them into multiple spaces to form multiple Stage, the gas carries out transmission movement in equal grooves without compression. Only the spiral structure at the end of the screw has a compression effect on the gas. Dry screw vacuum pumps should also pay attention to maintenance during daily use, so that the screw vacuum pump can function better and extend its service life.

1. If possible, clean the screw vacuum pump tube to ensure that the screw vacuum pump pipeline is smooth.
2. A dry screw vacuum pump should be put into trial operation after reassembly. Generally, the dry screw vacuum pump must be run for 2 hours and the oil should be changed twice. Because a certain amount of volatile matter will remain in the screw vacuum pump during cleaning, it must be put into normal operation after the operation is normal. 
3. Check whether the screw vacuum pump pipeline and joints are loose. Turn the screw vacuum pump by hand to see if the screw vacuum pump is flexible.
4. Regularly check the wear of the screw vacuum pump shaft sleeve. If the wear becomes large, replace it in time.
5. Start the motor, and when the screw vacuum pump operates normally, open the outlet pressure gauge and the inlet vacuum pump to see if they display appropriate pressure.
6. Open the gate valve of the screw vacuum pump and check the motor load at the same time.
7. When the screw vacuum pump is to be stopped, first close the gate valve and pressure gauge, and then stop the motor.
8. Check the oil level of the screw vacuum pump. If it does not meet the requirements, it must be adjusted to meet the requirements. When the screw vacuum pump is running, the oil level reaches the center of the oil mark.
9. Check the oil quality of the screw vacuum pump. If the oil is found to have deteriorated, replace it with new oil in time to ensure the normal operation of the screw vacuum pump.

How to judge the quality of dry screw vacuum pump

Dry screw pumps are a new type of vacuum pump.  In recent years, many vacuum pump manufacturers have been developing and producing them. They were developed mainly to replace traditional Water ring vacuum pumps, oil ring vacuum pumps and other pump types. Due to the unique design principle of the dry screw vacuum pump, it can be oil-free and water-free, can be coated with corrosion resistance, and has excellent sealing design. In addition to being slightly more expensive, it will far exceed the performance of traditional vacuum pumps in every aspect. 
If you want to buy a screw vacuum pump, you must first judge the quality. Based on our R&D, production and usage experience, we can judge from the following points:

1. Ultimate vacuum degree: Of course, the lower the ultimate vacuum degree, the better. Currently, domestically produced ones are generally around 5Pa, while imported ones are around 1Pa. Our company’s products can reach an ultimate vacuum of 0.0075 torr (0.01 hpa) with a single pump.
2. Vibration and noise: The vibration must be small, and the noise must be less than 80 dB.
3. Corrosion resistance: The dry screw vacuum pumps developed and produced by our company use super corrosion-resistant coating materials. Reduce the partial pressure of corrosive gases through gas ballast valve device.
4. Sealing: This is also very important.
5. Cooling effect: We use a spiral cooling water jacket that conforms to fluid dynamics and has excellent heat exchange efficiency. Reasonably low temperatures are maintained inside the pump, so coating damage is very low.

Basically, the judgment is based on the above points. It depends on the processing level and design technology level of the vacuum pump manufacturer. Generally speaking, because the cost of screw pumps is relatively high at present, if you want to use a cost-effective dry screw vacuum pump, it is recommended to be careful for choice, We has devoted many years of research to provide you with one-stop intelligent vacuum solutions.

How to choose a suitable dry screw vacuum pump?

In different categories, the functional characteristics of screw vacuum pumps vary widely. In order to meet the needs of the company’s working environment and output, the performance characteristics of dry screw vacuum pumps can be developed with excellent quality.
It is recommended that everyone choose carefully, have a reasonable and full understanding, and make correct judgments before purchasing.

1. Reasonable selection of types

There are many categories of screw vacuum pumps in the market, so it is recommended that you should be careful when choosing, and compare the technical features and performance characteristics of different categories, especially examining the manufacturer’s manufacturing level and detail management standards, Chnic can give you full support if you need help.

2. Select stable, reliable performance with safety guarantee 

Screw vacuum pumps can especially work in a variety of environments and are very stable and reliable in terms of quality. They can maintain good continuity during operation, have low vibration and low noise.

Which dry vacuum pump is more suitable for our production?

Throughout the development and production of dry vacuum pumps, they can be divided into two categories: contact seal type and frictionless gap seal type. Common models of contact seal type include oil-free piston and oil-free rotary vane. Common models of friction-free gap seal type include oil-free claw type, oil-free screw type and oil-free scroll type.

Contact-sealed dry vacuum pumps have a high failure rate, short maintenance cycles, and low vacuum levels. They cannot extract gases containing dust or entrained liquids and saturated steam, and they cannot provide a clean vacuum. They have low technical content. Many domestic manufacturers have already Production. Because of its low price, it has a certain market share in the country.

Friction-free gap-sealed dry vacuum pumps are new models that have just emerged in China in recent years. Their common features are no wear in the working chamber, low failure rate, high vacuum degree, and can provide clean vacuum. Claw type and screw type also have It can handle gases containing a small amount of dust or liquid, especially the vertical claw vacuum pump, which has good liquid and dust discharge performance, and especially performs very well in chemical drying and vacuum distillation processes.

Dry screw vacuum pump: Currently commercialized products have a pumping speed of 15-150L/s and an ultimate vacuum degree of up to 1Pa. They are generally of horizontal structure. They are suitable for use in relatively clean environments, such as electronics, vacuum coating and other industries. , used in the chemical and pharmaceutical industries with a high failure rate.

Claw-type rotor dry vacuum pump: The current commercial product of this dry vacuum pump has a pumping speed of 4 to 150L/s and an ultimate vacuum degree of 1 up to 3Pa. It is divided into horizontal and vertical structures. The horizontal structure is suitable for use in relatively clean environments, such as electronics, vacuum coating and other industries; the vertical structure is suitable for use in extracting gases containing dust, entrained liquids and condensable gases. However, there are many parts and components, and the assembly requirements are higher.

Scroll dry vacuum pump: The current commercial products of this dry vacuum pump have a pumping speed of 1 to 15L/s. There is currently no product exceeding 15L/s, and its ultimate vacuum degree can reach 1Pa. This pump is suitable for use in clean environments and cannot be used to pump gases containing dust and liquids. The production of scroll disks requires high equipment and complex processes. Its assembly and debugging procedures are extremely complex and difficult.

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