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Zibo Vacuum Equipment Plant Co., Ltd is one of the founders of China's vacuum industry. Relying on its independent research and development ability and learning from advanced technologies at home and abroad, it provides users with "Shuangshan brand" vacuum pumps and compressors as well as fully customized engineering systems. Shuangshan vacuum provides excellent service and technical support for vacuum pump, compressor and process system through technology R & D center, manufacturing plant and service center. In 1996, Company established a joint venture with Germany Siemens company, Siemens Vacuum Pump Compressor Co., Ltd. (now its predecessor of Gardner Denver-NASH), and in 2000, it was transformed into Zibo Vacuum Equipment Plant Co., Ltd. More than 60 years of development history, from making parts and castings only, to the company's vacuum products used in Chinese first carrier rocket.
Why Choose Us
Professional Team
Currently, the company covers an area of 250,000 square meters, possesses 1,265 sets of main production equipment, employs 286 individuals, including 138 professional technical personnel, and operates a professional vacuum pump compressor performance testing platform.
Our Projects
Our complete vacuum compressor units are modular, systematic, and automated, widely used in projects such as petroleum, petrochemicals, refining, hydrogenation, VOCs treatment, and wastewater treatment, as well as in new energy, new materials, papermaking, pharmaceuticals, and basic chemicals.
Technical Support
Shuangshan Vacuum provides excellent service and technical support for vacuum pumps, compressors, and process systems through our technology R&D center, manufacturing plant, and service center.
Our Products
With vacuum pumps and vacuum application equipment as the leading factors, we provide liquid ring vacuum pumps, liquid ring compressors and units, reciprocating vacuum pumps, Roots vacuum pumps, rotary vane vacuum pumps, screw vacuum pumps, vacuum dryers, complete project sets, etc. These are applied in various fields such as petrochemicals, papermaking, fertilizers, light industry, pharmaceuticals, and environmental protection.
GSP series is variable pitch dry screw vacuum pump,products are widely used in pharmaceutical,chemical,petrochemical,aerospace,electroics and other fields are applied.
Dry screw vacuum pimps can be combined with roots vacuum pump and build a complete vacuum system package according to the individual customer's application requirements.
According the application requirement, different size SSDP dry screw vacuum pumps can be combined with roots vacuum pump to build complete vacuum system. The system can be can be used widely in pharmaceutical, food, semiconductor, refining, electronics, petrochemical and aviation etc.
Dry vacuum pumps include Roots vacuum pumps, screw vacuum pumps, claw vacuum pumps, scroll vacuum pumps, molecular pumps and so on.
The screw vacuum pump system consists of a screw pump as the main vacuum pump, equipped with coolers, oil separators, filters etc. It is an independent vacuum acquisition system with simple and reliable operation.
Screw vacuum pump takes the space formed by screw and pump cavity as pump cavity to realize gas extraction and transportation. It is divided into oil screw pump and oil-free screw pump, twin screw vacuum pump and single screw vacuum pump.
Dry vacuum pumps are non-contact vacuum pumps that feature oil-free, liquid-free sealing. They achieve a clean vacuum without back-flow or diffusion of water and oil. No regular maintenance, such as replenishing or replacing water or oil, is required, which makes these pumps easy to handle.These pumps are indispensable in manufacturing processes of semiconductor devices, FPDs, LEDs, and solar batteries, which require a high degree of cleanliness. Their applications have expanded in recent years because it allows easy, clean exhaustion of gas from analyzers such as mass spectrometers and electronic microscopes. Capable of generating clean vacuums and offering maintenance convenience, they are also used in a variety of other applications, such as vacuum drying processes and film coating processes.
Dry vacuum pumps, the rotors contain a layer of coating that is very sensitive to temperature fluctuations. Moreover, recoating them becomes a very costly affair. However, due to a lack of coating on these rotors, the dry vacuum pump can withstand a broader temperature range of inlet gases and fluids, offering more leeway for operators in terms of process parameters.
Corrosion free
While the pump doesn’t use lubricants, it is susceptible to condensation with constant use. However, the vertical claw pumps are free draining. Therefore, there won’t be any prolonged condensation within the pump, leading to fewer chances of corrosion and other related damages.
Easy to replace and service
One of the most distinct advantages of a dry pump is its modular design. If one of the claws gets worn out or damaged, then it can be replaced separately instead of a complete systems overhaul. Furthermore, this also makes it easier to maintain.
Handles volatile materials
When it comes to harsh work environments and working with gases or fluids that are volatile, then dry pumps are the perfect choice as they make the operation safe due to their dry mechanism.
Application of Dry Vacuum Pumps
Dry vacuum pumps have a wide range of applications in various industries due to their unique advantages over other types of vacuum pumps. Some of the most common applications of dry vacuum pumps are:
Semiconductor Industry - Used in the semiconductor industry, where cleanliness and low contamination are critical. They are used to create a vacuum in the deposition chambers during the manufacturing process of microchips.
Medical Industry - Used in the medical industry, particularly in the production of medical devices such as pacemakers, catheters, and other implantable devices.
Food Industry - The food industry also uses dry vacuum pumps in the production of various food products, such as freeze-drying and packaging.
Environmental Industry - In the environmental industry, dry vacuum pumps are used for air sampling, soil remediation, and wastewater treatment.
Research and Development - Used in research and development applications, such as in laboratories for creating a vacuum in experiments.
Chemical Industry - Used in the chemical industry for distillation, drying, and other processes that require a vacuum.
Aerospace Industry - In the aerospace industry, dry vacuum pumps are used to create a vacuum in the chamber during testing of various equipment and components.
Power Generation - Used in power generation industries, particularly in nuclear power plants, for various applications such as cooling towers, steam turbines, and others.
Based on Dry vacuum pump working principle,Having various designs like Screw, Claw, Scroll technology of dry vacuum pump. Such pumps are called dry or Oil-free as they do not contain any sealing or lubricating fluids exposed directly to the vacuum in the pumping chamber typically they are capable of producing pressure in region of 50 mbara to 10-2 mbara. For reasons of reliability, reduced maintenance and operating cost many industries such as semiconductor, metallurgical, freeze drying are using dry pumps. These oil-free dry vacuum pumps are suitable for the harsh applications where the process carry needs to be handled by pumps effectively.
In Scroll type Dry vacuum pump working principle, the sides of the scrolls are separated by just enough space to prevent them from touching. No sealant or lubricant is required in the swept volume of the pump. One scroll is fixed, while the centre of the other scroll, orbits about the centre of the fixed scroll. As the orbiting scroll moves, semi-circular shaped gas pockets are formed. The trapped gases are thereby continuously compressed by the orbiting action until the gas load is finally exhausted through the discharge port at the centre of the pump. The dry scroll pump’s ultimate vacuum is <1.3 mbara and the potential applications, in rough vacuum band are like pick & place, Holding, etc.
Claw series of Dry Vacuum pump working principle having two stainless steel, non-contacting claw rotors are cylindrical for most of the circumference of the rotor but have a deep depression at two opposite tips of the claw.In this design, as the two claw rotates, gas is drawn in via an inlet slot,continued rotation closes the inlet while the claws compress the trapped volume of gas until the second rotor exposes the outlet.
Vacuum pump, also called piston vacuum pump, relies on the reciprocating motion of the piston to periodically change the working volume of the pump cavity (cylinder). The structure of reciprocating vacuum pump is similar to reciprocating piston compressor. When working, the suction pipe is vacuumed and the exhaust pipe passes through the atmosphere. Reciprocating vacuum pump can be used in vacuum distillation, vacuum concentration, vacuum crystallization, vacuum filtration, vacuum drying and concrete vacuum operation.
The scroll disc of a scroll oil-free vacuum pump is a scroll disc structure formed by one or more involute spirals connecting one end with a plane. A pair of scroll disks composed of a static scroll disk and a moving scroll disk constitute the basic pumping mechanism of a scroll oil-free vacuum. For example, in a two-stage scroll oil-free vacuum pump, there are two directions corresponding to the fixed scroll disk, a rotating scroll disk located between the two scroll disks. The relative motion of the dynamic and static vortex disks forms a crescent-shaped vacuum chamber with constant volume change, which makes the gas be sucked in and discharged from the exhaust port, and completes the exhaust cycle.
The double round split design is very similar to the most popular and widely used roots pump. In fact, some of the earliest dry pump design ideas were to stack Roots pumps. This multi-stage design makes the gas path quite complex, and each stage needs a large flow of nitrogen to play the role of dilution and isolation. At the same time, in order to achieve a good vacuum, there are very strict requirements for the gap at all levels. Of course, this design increases the internal compression ratio, which makes its power consumption relatively low.
The principle of the three lobed design is the same as that of the double lobed design, except that the gas is divided into three parts in a circle rather than two parts like the double lobed design. The two designs have the same advantages and disadvantages. In order to further reduce the power consumption, some manufacturers in the transmission part choose two DC motors, but this will also lead to reduced torque and reduced restart capacity. As with the double round split design, each stage of the three leaf round split design needs a large flow of nitrogen to play a role of dilution and isolation.
In the design of combined (roots + claw), roots is used to improve the extraction efficiency under low pressure and claw is used to improve the extraction efficiency under high pressure. Its basic principle and gas path are exactly the same as the circular lobe design introduced earlier. Some manufacturers change their final stage to a star design, so that they can divide the gas into five parts in one revolution, just like the three circle split design can divide it into three parts. Similarly, in many processes, each stage of the combined design needs a large flow of nitrogen to play a role of dilution and isolation.
In the external compression screw design, a pair of equidistant screws are used. This reduces internal compression to a minimum and makes the gas path the shortest and easiest. In this way, the gas stays in the pump body for the shortest time. Although the power consumption of this design is relatively high due to the reduction of internal compression ratio, it shows high stability in many complex semiconductor processes. This single-stage design makes the demand for nitrogen consumption very small and simple, so that it has good interchangeability in different processes. In many clean processes, nitrogen may not even be used.
In addition to the use of a pair of non equidistant screws, the basic principles of internal compression screw design and external compression screw design are very similar. The reduction of the volume between the screws makes the internal compression. This design reduces the power consumption to the same level as multistage pump due to internal compression. But in many processes, this internal compression, like multi-stage pump, is very easy to cause the physical and chemical changes of gas in the pump body and produce solidification or liquefaction.
Dry screw vacuum pumps are environmentally friendly as there is less oil to dispose of and maintain within their design. These pumps are more efficient than a liquid sealed model and are well suited for industrial and process applications. The KDP's simple, robust design can handle process by-products liquids, condensate, and even small particles. The SDV’s space saving C-face motor design eliminates the need for motor coupling and guard, with Niflon coated internals to reduce damage from corrosive or condensate gases.Dry screw vacuum pumps require no water or oil for sealing or lubrication in the vacuum stages. Consequently, these dry vacuum systems eliminate effluent generation, pollution, and high treatment costs.
Oil-free operation
One of the most significant benefits of Dry Screw Vacuum Pumps is their oil-free operation. Unlike traditional vacuum pumps that use oil in the compression chamber, Dry Screw Vacuum Pumps eliminate the risk of oil contamination, making them ideal for industries where purity is paramount, such as pharmaceuticals and electronics manufacturing.
Low maintenance requirements
These pumps require considerably less maintenance compared to oil-sealed counterparts. The absence of oil in the compression chamber means no regular oil changes, reducing downtime and operational costs.
Reduced risk of contamination
In manufacturing industries that require a clean and uncontaminated environment, such as semiconductor manufacturing, Dry Screw Vacuum Pumps ensure that the pumped gases remain free from oil and other contaminants.
Energy efficiency
Dry Screw Vacuum Pumps are renowned for their energy efficiency. Their innovative design allows them to operate with minimal power consumption, contributing to cost savings and sustainability in manufacturing processes.
Consistent performance
The pumps offer consistent and repeatable performance, which is vital in manufacturing, where product quality and consistency are of utmost importance.
Versatile applications
These pumps find application in diverse manufacturing processes, from materials handling and packaging to analytical instrumentation, catering to the multi-faceted requirements of the industry.
How Many Combinations Of Dry Screw Vacuum Pumps
Combined type (Roots vacuum pump + Claw vacuum pump)
The combined type (Roots+claw) screw vacuum pump is classified as Roots to develop the vacuum thermal efficiency under lower water pressure, and the claw to develop the vacuum thermal efficiency under higher water pressure. Its basic concept is the same as that of the vapor loop and the circular lobed classification. There are also some that change the final stage of the screw vacuum pump to a star-shaped classification, so that the vapor can be divided into five parts during the entire rotation, just like the three-circle split-type classification can be divided into three parts
Internal compact screw type
The continuous reduction of the capacity between the screw rods promotes the internal tightening of the screw vacuum pump. In many processes, this type of internal shrinkage is the same as a multi-stage centrifugal pump, which simply causes the physical transformation of the vapor in the screw vacuum pump to cause dryness or vaporization.
Double round lobe type
The multi-stage classification of double-circle lobes promotes the vapor loop to be equivalent to chaos, and each stage requires a large amount of hydrogen to be mixed with water and isolated. In order to achieve a good vacuum, there are very strict regulations on each gap. This type of classification results in lower power consumption of screw vacuum pumps due to the increased internal shrinkage ratio.
Three round lobes
The mechanism of the three-circle-lobe classification is the same as that of the method described. The vapor is divided into three parts only during the entire rotation, instead of being divided into two parts like the double-circle-lobe classification. In order to further reduce the power consumption, some of the gearboxes will use two DC motors, but this will also reduce the torque and reduce the potential for restart.
External compact screw type
In the classification of the external compact screw type, two equidistant screw rods are used. This promotes the reduction of the internal tightening of the screw vacuum pump and the simplicity of the vapor loop. In that way, the time that the vapor stays in the screw vacuum pump body is also short. This type of classification shows very strong reliability in the chaotic optoelectronic device process.
Thermal Management In Dry Screw Vacuum Pumps
Thermal management is essential for the reliable operation of chemical dry screw vacuum pumps.
In a pump that is too cool for a given process, aggressive vapors may condense, leading to corrosion, the dilution of lubricants, and the swelling of seals. This damage is serious but can only happen if the vapor is allowed to condense into the liquid phase.
Conversely, if the operating temperatures in the pump are too high for a given process, unwanted reactions such as polymerization or auto-ignition are possible, with the addition of high bearing temperatures or thermal seizure.
The effects mentioned above can be mitigated slightly by internal coatings but this is something that should never be relied on. Coatings work great to protect the pump during initial storage and system commissioning but they can only survive so long at the temperatures and vacuum levels where the pumps spend most of their time.
The key is to ensure that the process vapors stay in the vapor phase . A few strategies to ensure this occurs include temperature/flow control of the pump coolant, use of nitrogen purge to change process dew point, and the use of inlet condensers to remove the vapor upstream of the pump.
To further improve reliability where system challenges are always present, additional features can be added to the pump system to help guarantee reliability. One example is a solvent flush system to keep the pumping mechanism free and clean. Another being knock-out pots (KOPs) and filters to capture liquid or powder slugs when unable to prevent them.
Before all normal transportation and transmission, the dry screw vacuum pump should be tested for abnormal vibration and impact noise. The first dry screw vacuum pump shall also measure the limit gas pressure of the dry screw vacuum pump, which shall meet the technical standards. Under the standard of long – term operation of dry screw vacuum pump, the temperature of dry screw vacuum pump above 70 degrees is not allowed. The measurement of dry pumping speed is very complicated. Generally not checked.
Dry screw vacuum pump is a kind of mechanical equipment must provide cooling circulating water, before starting to provide cooling circulating water, and then restart. The inlet and outlet temperatures for cooling recycled water are not suitable to exceed 30 degrees.
The pipeline between the continuous dry screw vacuum pump and the software to be pumped shall be as short and thick as possible. The nominal diameter of the pipe shall be general. The inlet diameter of the type dry screw vacuum pump shall be very large to prevent the friction resistance of the dry type pipeline from endangering the speed of the vacuum pump.
In order to maintain the daily cleaning of the room during work, which is conducive to the physical and mental health of the workers, the steam discharged from the room is immediately drawn out of the room with a leather pipe.
When the dry screw vacuum pump does not work for a long time or the operating temperature is low, it will cause difficulty in starting. At this point, air shall be introduced into the vacuum pump mouth of the dry screw vacuum pump, which shall be started after several weeks of rotation with a large number of rotating pulley (not connected to the switching power supply). If the dry screw vacuum pump is immediately connected, the motor can be run again several times to drain the oil stored in the dry screw vacuum pump chamber into the car tank and start. If not, the dry screw vacuum pump can be immediately heated with a radiant source or infrared lamp until it can be moved.
Before use, check whether the vacuum pump oil of the mechanical equipment reaches the oil line marking part of the window. Also, make sure to check the direction of rotation of the motor pulley. The observer is pointing at the pulley. The pulley should be rotated clockwise. If the rotation direction is opposite, the two connection heads of the phase-controlled switching power supply can be replaced. Otherwise, the vane vacuum pump will not produce the vacuum effect, but the vacuum pump oil and air pump into the pumping system software, causing serious pollution.
After the work is completed, first close the high vacuum valve, and then close the low vacuum valve. The rotary vane vacuum pump is then stopped, and the air is discharged (such as the electromagnetic induction vacuum pump with the exhaust valve, which is fully automatic) to prevent the oil from returning to the ultrafiltration device, and finally the main switching power supply and water supply are disconnected.
Care should be taken to prevent hard solid chemicals (metal debris, laminated glass debris, etc.). To avoid falling into the dry screw vacuum pump and scratch the suitable parts of the dry screw vacuum pump. When the dry screw vacuum pump is shut down for a long time, it should be stored in a dry and clean natural environment and blocked by the vacuum pump mouth and exhaust port, so as to avoid waste falling into.
When disassembling and assembling assembly line mechanical equipment dry screw vacuum pump, care must be taken not to knock the protruding surface or damage the screw, after cleaning the parts should be dry or air-dried (temperature should not be too high, time should not be too long). On the assembly line, the walls of the dry screw vacuum pumps are coated with a small amount of vegetable oil to remove as much dead space as possible. The rest of the oil is pipe-based, pumping out too much oil.
Q: What is a dry vacuum pump used for?
Q: How does a dry pump work?
Q: What is the difference between a wet pump and a dry pump?
Q: Can vacuum pumps run dry?
Q: What is the principle of dry claw vacuum pump?
Q: What is the difference between a wet and dry vacuum system?
Q: What is the reason that dry vacuum pumps do not need any lubricants?
Q: What is dry screw pump?
Q: Why oil is used in vacuum pump?
Q: What is the difference between a vacuum pump and a suction pump?
Q: What is a dry screw vacuum pump used for?
Q: What is the capacity of a dry screw vacuum pump?
Q: Can screw pump run dry?
Q: What is the difference between screw and vane vacuum pumps?
Q: What is screw vacuum pump?
Q: What are the advantages of a screw pump?
Q: Where is the screw pump used?
Q: What is the advantages of using screw pump other than types of pumps?
Q: Is screw pump a reciprocating pump?
Q: What is the difference between screw pump and diaphragm pump?
