Screw vacuum pump is the use of a pair of screw, made in the pump shell synchronous high-speed reverse rotation of the effects of the suction and exhaust and suction device, it is the upgrading production of oil seal type vacuum pump, to pump in addition to containing a large amount of water vapor and a small amount of dust gas occasions, in the domestic pharmaceutical industry, chemical industry, higher requirements for clean vacuum of companies such as semiconductor field widely used.
Two screw fine dynamic balancing correction, and is supported by bearings, is installed in the pump shell, between screw and screw has a certain gap, so the pump is working, no friction between each other, smooth running, low noise, working cavity without lubricating oil, therefore, dry screw pump can pump in addition to containing a large amount of water vapor and a small amount of dust gas occasions, limiting vacuum is higher, lower power consumption, It has the advantages of energy saving and maintenance free. It is the replacement of oil seal vacuum pump.
All kinds of vacuum pump increasingly under the influence of vacuum applications, the development of general vacuum system cannot meet the requirements of clean oil and corrosion resistance, so the dry vacuum pump market in great demand in recent years, vacuum products upgrading situation, have a lot of oil vacuum system has been replaced by oil free clean vacuum system. Almost every large vacuum company abroad produces various types of dry vacuum pumps. Screw vacuum pump belongs to non-contact dry pump, is a kind of ideal pump appeared in the early 1990s, with its wide pumping speed range, simple and compact structure, pumping chamber components without friction, long life, low energy consumption, no oil pollution and other advantages can be widely used.
Due to its superior performance, dry screw vacuum pump has become the preferred vacuum acquisition equipment in microelectronics, semiconductor, pharmaceutical, precision processing and other industries in Europe, America and Japan. Based on screw compressor, Japan developed long rotor profile of vacuum pump very early and put it into the market. Several vacuum equipment companies in Germany have also gradually developed equal pitch and variable pitch rotor profiles, and done a lot of research on rotor and body cooling. In 2008, Chinese enterprises also put screw vacuum pump production into mass production, which has been well applied in chemical and pharmaceutical industries
The drive shaft is connected with the active rotor, which is driven by the synchronous gear to rotate the driven rotor. The cooling water channel is opened on the shell to cool the temperature of the rotor and the exhaust port. The synchronous gear and the bearing are lubricated with oil, and the bearing and the shell are sealed by seals to achieve the effect of no oil. Dry screw vacuum pump with oil-free CZPT in the sealing and lubrication structure is similar, the general vacuum pump exhaust end with mechanical seals, intake side is usually double-lip seal. In the transmission mode, the general is the direct motor, with a coupling and rotor connection, very few with a belt or drive chain transmission. Constant pitch screw pump due to no internal compression process, the exhaust temperature is very high, such as the cooling effect is not good, will cause the deformation of the rotor and shell, affect the pumping effect. Cooling the casing is an essential link, water cooling is the most common method, in the casing body, the outer bearing through the cooling water, can achieve the purpose of cooling the casing and then cooling the rotor.
Similar to screw compressor, screw dry vacuum pump work process can be divided into suction, compression and exhaust 3 processes. As the rotor rotates, each pair of meshing teeth successively completes the same working cycle, now illustrated by 1 pair of teeth.
Breathe in process
The positive rotor rotates counterclockwise and the negative screw rotates clockwise. The upper rotor end face is the suction section, and the lower end face is the exhaust end face.
The compression process
Turn to the end face is the exhaust end face. Here, the Yang rotor rotates clockwise and the Yin rotor rotates counterclockwise. The upper rotor end face is the suction section, and the lower end face is the exhaust end face.
Screw pump exhaust process, the volume between teeth and exhaust orifice connected, that is, the exhaust process began. With the continuous reduction of the volume between the teeth, the gas with exhaust pressure is gradually discharged through the exhaust orifice.
The performance characteristics of
1. There is no medium in the working chamber, so a clean vacuum can be obtained
2, the surface of the working cavity and screw rotor has anti-corrosion coating, can adapt to bad working conditions
3, the gas in the pump without compression, suitable for extraction of coagulable gas
4, a single pump can be pumped from the atmosphere to 1Pa, vacuum system can be greatly simplified.
5. Water temperature has little influence on vacuum, saving water over 90%, and even does not consume water.
6, no oil consumption, no dripping
7, no friction between rotating parts, high speed operation, small size
8. Simple structure and convenient maintenance.
9, the pumped gas is directly discharged from the pump body, no pollution of water, no environmental pressure, more convenient gas recovery.
10, with roots pump, molecular pump composed of oil-free unit
|Speed of suction
|Quick plug connector
|Pressure regulating valve
|According to design
|Quck plug connector
|Double Screw Pump
|Screw Suction Method:
|Pump Shaft Position:
Disadvantages of using a vacuum pump
A vacuum pump is a device that pulls gas molecules out of a volume and leaves a partial vacuum. Its main function is to create a relative vacuum within a given volume. There are several types of vacuum pumps. Some of them are better suited for specific purposes than others. However, there are some disadvantages to using a vacuum pump.
Application of vacuum pump
Vacuum pumps are invaluable tools in many industrial and scientific processes. They are often used to move gas and other harmful substances and to clear clogged drains. They are also used to support mechanical equipment. For example, they can be mounted on the engine of a motor vehicle or the power hydraulic component of an aircraft. No matter how they are used, they should fit the application.
The principle of a vacuum pump is to draw gas from a sealed chamber to create a partial vacuum. Over the years, vacuum pump technology has evolved from its original beginnings to its current form. Today, there are many types of vacuum pumps, including rotary vane pumps, momentum transfer pumps, and regeneration pumps.
The semiconductor industry is a major user of vacuum pumps. Among other applications, these pumps are commonly used for mounting circuit boards, securing components, blowing and jetting, and pumping. The use of renewable resources has paved the way for widespread semiconductor production, where vacuum pumps are crucial. This manufacturing shift is expected to boost vacuum pump sales across Europe.
The most common types of vacuum pumps are positive displacement and rotary vane pumps. Positive displacement pumps are most effective for rough vacuum applications and are usually paired with momentum transfer pumps. These pumps are used in pharmaceutical, food and medical processes. They are also used in diesel engines, hydraulic brakes and sewage systems.
Positive displacement pumps are used to create low vacuum conditions and create a partial vacuum. These pumps create lower air pressure by enlarging the chamber and allowing gas to flow into the chamber. The air in the cavity is then vented to the atmosphere. Alternatively, momentum transfer pumps, also known as molecular pumps, use high-speed rotating blades to create dense fluids.
Vacuum pumps are useful in industrial applications. However, they are not perfect and have some drawbacks. One of them is that their output is limited by the vacuum hose. Vacuum hoses are the bottleneck for vacuum pump performance and evacuation rates. The hose must be kept free of water and organic matter to ensure the highest possible vacuum.
Dry vacuum pumps do not have these problems. They may be more cost-effective but will increase maintenance costs. Water consumption is another disadvantage. When pond water is used, the pump puts additional pressure on the treatment facility. Additionally, contaminants from the gas can become trapped in the water, shortening the life of the pump.
Another disadvantage of vacuum pumps is their limited operating time at low vacuum. Therefore, they are only suitable for extremely high vacuum levels. Diaphragm pumps are another option for industrial applications. They have a sealed fluid chamber that allows a moderate vacuum. They also feature short strokes and a low compression ratio, making them quieter than their reciprocating counterparts.
Vacuum pumps are used in many industrial and scientific processes. They can be used to transport hazardous materials or clear clogged drains. They are also used in rear doors and dump tanks. Certain types of vacuum pumps can cause fluid blockages, which can be harmful. The vacuum pump should also be well suited to the fluid in it to avoid contamination.
Another disadvantage is the lack of proper vacuum system testing equipment. Mechanics often underestimate the importance of a properly functioning vacuum system. Most stores lack the equipment needed for proper troubleshooting. Typically, mechanics rely on the cockpit vacuum gauge to determine if the pump is working properly.
Some vacuum pumps are capable of providing constant vacuum. These pumps are also capable of eliminating odors and spills. However, these advantages are outweighed by some disadvantages of vacuum pumps.
editor by CX 2023-04-23