Product Description
Working principle
The vacuum in dry screw pumps is created through 2 parallel-arranged screw rotors that rotate in opposite directions. These rotors trap the gas coming in through the inlet and deliver it to the gas discharge or pressure side. As the gas is getting compressed, there is no contact between the rotors. This does away with any need for the compression chamber to have any operating fluids or lubrication.
The lubricant used to lubricate the gears and shaft seal is sealed in the gearbox by the shaft seal. The pump can be cooled either directly by circulating cooling water or by a cooling unit with fan and radiator.
The dry screw vacuum pump adopts a special rotor pitch design, compared with the ordinary rotor pitch design, reduce the energy consumption by about 30%, the temperature rise of the exhaust end is reduced by about 100 ºC, the reliability and stability of the operation of the product is greatly improved, can be suitable for any working conditions of vacuum.
The dry screw pumps can be widely used in solvent recovery, vacuum drying, concentration, crystallization, distillation and other processes in the chemical and pharmaceutical industries, vacuum extrusion and molding in the plastic and rubber industries, vacuum degassing in the metallurgical industry; vacuum degassing and drying in the solar energy, microelectronics, lithium battery and other industries.
Pump body and end caps: high-strength cast iron.
Pump body and end caps: high strength cast iron.
Screw rotor: ductile cast iron.
Anti-corrosion coating: corrosion-resistant Hastelloy.
Synchronous gears: alloy steel.
Radial lip seal: imported PTFE mixture or
high-temperature resistant fluorine rubber;
Seal bushings: stainless steel surface covered with ceramic.
Flow chart
Main features
1. The screw rotor is designed with variable pitch structure, the ultimate vacuum can reach below 1Pa, which can meet all kinds of vacuum processing from atmosphere to high vacuum.
2. Oil free – Adapt to various special working conditions for reliable use.
3. It can operate reliably in the pressure range from atmosphere to several Pa.
4. No friction between moving parts, simple structure, lower operation and maintenance cost.
5. Nitrogen seal and composite seal design is optional, which has the benefit of good reliability, low cost of use, simple maintenance.
6. The rotor is dynamically balanced at high speed and the motor is connected by flange, with high concentricity, low vibration and low noise.
7. Hastelloy anti-corrosion coating is optional for rotor surface, condensable material is not easy to condense in the pump cavity, better corrosion resistance.
8. Compared with oil seal pump, liquid ring pump, there is no waste gas, no waste liquid, no waste oil emission, energy saving and environmental friendly.
It can be used alone or with Roots vacuum pump, air-cooled Roots vacuum pump, molecular vacuum pump, etc. to obtain an oil-free high vacuum system.
The benefit of dry screw vacuum pump compared to liquid ring vacuum pump:
-Shorten the process cycle and improve production efficiency
-Reduce water consumption
-Save energy
-Improve product quality
-Can recover solvent by reducing the drying time of products
-Reduce the cost of wastewater and waste gas treatment
A CASE in a pharmaceutical factory
Process introduction: The penicillin sodium salt solution is fed into the crystallization tank through vacuum. By steam heating, agitator stirring, and adding butanol, the water and butanol in the penicillin solution are pumped into the condenser and condensed into the liquid collecting tank, which can be reused.
Process requirements:
1. The volume of crystallization tank is 7.5m3, and about 4.5m3 penicillin solution is added in the process.
2. Before entering the crystallization tank, the water content of penicillin solution is about 20%, and after crystallization, the water content is required to be about 1%.
3. Vacuum feeding for 2h, then adding butanol for 30min, and then starting to crystallize. The process requires low temperature and fast speed, and the lower the temperature, the better the quality of penicillin. The shorter the reaction time, the better.
4. Vacuum degree requirements: the vacuum degree shall be kept above -0.097MPa. High vacuum degree can reduce the reaction temperature and shorten the reaction time.
The previous vacuum system was 2BE1252+air ejector, which is now transformed into a dry screw vacuum pump. The comparison table of test data is as follows:
| vacuum system | 2BE1252+ejector | DVP 1600 screw pump |
| Feeding time (h) | 2 | 1.5 |
| Liquid temperature at the beginning of crystallization (ºC) | 31.5 | 16.6 |
| Crystallization time (h) | 6 | 4.5 |
| Time from crystallization to liquid coming out (min) | 30 | 15 |
| Crystal quality | average | good |
| Power consumption (KW) | 45 | 37 |
| Water consumption (m3) | 26.4 | 0.72 |
Economic benefit analysis:
| Cost saving(USD) | Remark | |
| Water consumption and treatment | 130 | Water cost: $0.65/m3, water treatment: 30/m3 |
| Power | 15 | $0.15/Kwh |
| Labor, production efficiency | 43 | Reduced from 6 hour to 4.5 hour |
| Sum up | 188 |
Please contact us for a detailed report of economic benefit analysis for your applications!
Configuration
Standard configuration:
Machine base, pump head, coupling, motor, driving screen, air inlet connector, check valve, vacuum gauge, manual filling valve exhaust port muffler.
Optional accessories:
Inlet filter, inlet condenser, solvent flushing device, nitrogen purging device, nitrogen sealing device, exhaust port condenser, solenoid filling valve, cooling water flow switch, temperature sensor, pressure transmitter.
Applications
| Leak Detection | Metallurgy | Industrial furnace | Lithium Battery |
| Chemical, pharmaceutical | Wind tunnel test | Power Industry | Vacuum coating |
| Microelectronics industry | Drying Process | Packaging and Printing | Solar Energy |
| Exhaust gas recovery |
Product Parameters
Technical data of Constant pitch Dry screw vacuum pump
| Spec. Model |
Nominal pumping speed(50Hz) | Ultimate pressure | Nominal motor rating (50Hz) | Nominal motor speed (50Hz) | Noise level Lp | Maximum cooling water required |
Suction Connection size | Discharge Connection size | Weight (Without Motor) |
| m³/h | Pa | kw | rpm | dB(A) | L/min | mm | mm | Kg | |
| DSP-140 | 143 | 5 | 4 | 2900 | 82 | 10 | 50 | 40 | 240 |
| DSP-280 | 278 | 5 | 7.5 | 2900 | 83 | 20 | 50 | 40 | 350 |
| DSP-540 | 521 | 5 | 15 | 2900 | 83 | 30 | 65 | 50 | 550 |
| DSP-650 | 617 | 5 | 18.5 | 2900 | 84 | 45 | 65 | 50 | 630 |
| DSP-720 | 763 | 5 | 22 | 2900 | 85 | 55 | 80 | 80 | 780 |
| DSP-1000 | 912 | 5 | 30 | 2900 | 86 | 70 | 100 | 80 | 880 |
Technical data of Variable pitch Dry screw vacuum pump
| Spec. Model |
Nominal pumping speed(50Hz) | Ultimate pressure | Nominal motor rating (50Hz) | Nominal motor speed (50Hz) | Noise level Lp | Maximum cooling water required |
Suction Connection size | Discharge Connection size | Weight (Without Motor) |
| m³/h | Pa | kw | rpm | dB(A) | L/min | mm | mm | Kg | |
| DVP-180 | 181 | 2 | 4 | 2900 | 82 | 8 | 50 | 40 | 280 |
| DVP-360 | 354 | 2 | 7.5 | 2900 | 83 | 10 | 50 | 40 | 400 |
| DVP-540 | 535 | 2 | 11 | 2900 | 83 | 10 | 50 | 40 | 500 |
| DVP-650 | 645 | 1 | 15 | 2900 | 84 | 20 | 65 | 50 | 600 |
| DVP-800 | 780 | 1 | 22 | 2900 | 86 | 30 | 100 | 80 | 800 |
| DVP-1600 | 1450 | 1 | 37 | 2900 | 86 | 40 | 125 | 100 | 1200 |
Note: The cooling water volume of the dry screw vacuum pump provided in the table is the amount under 20ºC room temperature water. When the dry screw vacuum pump uses cooling device, the cooling water will be increased, the difference of inlet and outlet water temperature is generally controlled below 7ºC is appropriate.
Dimension
FAQ
Q: What information should I offer for an inquiry?
A: You can inquire based on the model directly, but it is always recommended that you contact us so that we can help you to check if the pump is the most appropriate for your application.
Q: Can you make a customized vacuum pump?
A: Yes, we can do some special designs to meet customer applications. Such as customized sealing systems, speical surface treatment can be applied for roots vacuum pump and screw vacuum pump. Please contact us if you have special requirements.
Q: I have problems with our vacuum pumps or vacuum systems, can you offer some help?
A: We have application and design engineers with more than 30 years of experience in vacuum applications in different industries and help a lot of customers resolve their problems, such as leakage issues, energy-saving solutions, more environment-friendly vacuum systems, etc. Please contact us and we’ll be very happy if we can offer any help to your vacuum system.
Q: Can you design and make customized vacuum systems?
A: Yes, we are good for this.
Q: What is your MOQ?
A: 1 piece or 1 set.
Q: How about your delivery time?
A: 5-10 working days for the standard vacuum pump if the quantity is below 20 pieces, 20-30 working days for the conventional vacuum system with less than 5 sets. For more quantity or special requirements, please contact us to check the lead time.
Q: What are your payment terms?
A: By T/T, 50% advance payment/deposit and 50% paid before shipment.
Q: How about the warranty?
A: We offer 1-year warranty (except for the wearing parts).
Q: How about the service?
A: We offer remote video technical support. We can send the service engineer to the site for some special requirements.
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| After-sales Service: | Online Video Instruction |
|---|---|
| Warranty: | 1 Year |
| Nominal Pumping Speed(50Hz): | 521 M3/H |
| Ultimate Pressure: | 5PA |
| Nominal Motor Rating(50Hz): | 15 Kw |
| Nominal Motor Speed(50Hz): | 2900 Rpm |
How Do You Maintain and Troubleshoot Vacuum Pumps?
Maintaining and troubleshooting vacuum pumps is essential to ensure their optimal performance and longevity. Here’s a detailed explanation:
Maintenance of Vacuum Pumps:
1. Regular Inspection: Perform regular visual inspections of the pump to check for any signs of damage, leaks, or abnormal wear. Inspect the motor, belts, couplings, and other components for proper alignment and condition.
2. Lubrication: Follow the manufacturer’s guidelines for lubrication. Some vacuum pumps require regular oil changes or lubrication of moving parts. Ensure that the correct type and amount of lubricant are used.
3. Oil Level Check: Monitor the oil level in oil-sealed pumps and maintain it within the recommended range. Add or replace oil as necessary, following the manufacturer’s instructions.
4. Filter Maintenance: Clean or replace filters regularly to prevent clogging and ensure proper airflow. Clogged filters can impair pump performance and increase energy consumption.
5. Cooling System: If the vacuum pump has a cooling system, inspect it regularly for cleanliness and proper functioning. Clean or replace cooling components as needed to prevent overheating.
6. Seals and Gaskets: Check the seals and gaskets for signs of wear or leakage. Replace any damaged or worn seals promptly to maintain airtightness.
7. Valve Maintenance: If the vacuum pump includes valves, inspect and clean them regularly to ensure proper operation and prevent blockages.
8. Vibration and Noise: Monitor the pump for excessive vibration or unusual noise, which may indicate misalignment, worn bearings, or other mechanical issues. Address these issues promptly to prevent further damage.
Troubleshooting Vacuum Pump Problems:
1. Insufficient Vacuum Level: If the pump is not achieving the desired vacuum level, check for leaks in the system, improper sealing, or worn-out seals. Inspect valves, connections, and seals for leaks and repair or replace as needed.
2. Poor Performance: If the pump is not providing adequate performance, check for clogged filters, insufficient lubrication, or worn-out components. Clean or replace filters, ensure proper lubrication, and replace worn parts as necessary.
3. Overheating: If the pump is overheating, check the cooling system for blockages or insufficient airflow. Clean or replace cooling components and ensure proper ventilation around the pump.
4. Excessive Noise or Vibration: Excessive noise or vibration may indicate misalignment, worn bearings, or other mechanical issues. Inspect and repair or replace damaged or worn parts. Ensure proper alignment and balance of rotating components.
5. Motor Issues: If the pump motor fails to start or operates erratically, check the power supply, electrical connections, and motor components. Test the motor using appropriate electrical testing equipment and consult an electrician or motor specialist if necessary.
6. Excessive Oil Consumption: If the pump is consuming oil at a high rate, check for leaks or other issues that may be causing oil loss. Inspect seals, gaskets, and connections for leaks and repair as needed.
7. Abnormal Odors: Unusual odors, such as a burning smell, may indicate overheating or other mechanical problems. Address the issue promptly and consult a technician if necessary.
8. Manufacturer Guidelines: Always refer to the manufacturer’s guidelines and recommendations for maintenance and troubleshooting specific to your vacuum pump model. Follow the prescribed maintenance schedule and seek professional assistance when needed.
By following proper maintenance procedures and promptly addressing any troubleshooting issues, you can ensure the reliable operation and longevity of your vacuum pump.
Considerations for Selecting a Vacuum Pump for Cleanroom Applications
When it comes to selecting a vacuum pump for cleanroom applications, several considerations should be taken into account. Here’s a detailed explanation:
Cleanrooms are controlled environments used in industries such as semiconductor manufacturing, pharmaceuticals, biotechnology, and microelectronics. These environments require strict adherence to cleanliness and particle control standards to prevent contamination of sensitive processes or products. Selecting the right vacuum pump for cleanroom applications is crucial to maintain the required level of cleanliness and minimize the introduction of contaminants. Here are some key considerations:
1. Cleanliness: The cleanliness of the vacuum pump is of utmost importance in cleanroom applications. The pump should be designed and constructed to minimize the generation and release of particles, oil vapors, or other contaminants into the cleanroom environment. Oil-free or dry vacuum pumps are commonly preferred in cleanroom applications as they eliminate the risk of oil contamination. Additionally, pumps with smooth surfaces and minimal crevices are easier to clean and maintain, reducing the potential for particle buildup.
2. Outgassing: Outgassing refers to the release of gases or vapors from the surfaces of materials, including the vacuum pump itself. In cleanroom applications, it is crucial to select a vacuum pump with low outgassing characteristics to prevent the introduction of contaminants into the environment. Vacuum pumps specifically designed for cleanroom use often undergo special treatments or use materials with low outgassing properties to minimize this effect.
3. Particle Generation: Vacuum pumps can generate particles due to the friction and wear of moving parts, such as rotors or vanes. These particles can become a source of contamination in cleanrooms. When selecting a vacuum pump for cleanroom applications, it is essential to consider the pump’s particle generation level and choose pumps that have been designed and tested to minimize particle emissions. Pumps with features like self-lubricating materials or advanced sealing mechanisms can help reduce particle generation.
4. Filtration and Exhaust Systems: The filtration and exhaust systems associated with the vacuum pump are critical for maintaining cleanroom standards. The vacuum pump should be equipped with efficient filters that can capture and remove any particles or contaminants generated during operation. High-quality filters, such as HEPA (High-Efficiency Particulate Air) filters, can effectively trap even the smallest particles. The exhaust system should be properly designed to ensure that filtered air is released outside the cleanroom or passes through additional filtration before being reintroduced into the environment.
5. Noise and Vibrations: Noise and vibrations generated by vacuum pumps can have an impact on cleanroom operations. Excessive noise can affect the working environment and compromise communication, while vibrations can potentially disrupt sensitive processes or equipment. It is advisable to choose vacuum pumps specifically designed for quiet operation and that incorporate measures to minimize vibrations. Pumps with noise-dampening features and vibration isolation systems can help maintain a quiet and stable cleanroom environment.
6. Compliance with Standards: Cleanroom applications often have specific industry standards or regulations that must be followed. When selecting a vacuum pump, it is important to ensure that it complies with relevant cleanroom standards and requirements. Considerations may include ISO cleanliness standards, cleanroom classification levels, and industry-specific guidelines for particle count, outgassing levels, or allowable noise levels. Manufacturers that provide documentation and certifications related to cleanroom suitability can help demonstrate compliance.
7. Maintenance and Serviceability: Proper maintenance and regular servicing of vacuum pumps are essential for their reliable and efficient operation. When choosing a vacuum pump for cleanroom applications, consider factors such as ease of maintenance, availability of spare parts, and access to service and support from the manufacturer. Pumps with user-friendly maintenance features, clear service instructions, and a responsive customer support network can help minimize downtime and ensure continued cleanroom performance.
In summary, selecting a vacuum pump for cleanroom applications requires careful consideration of factors such as cleanliness, outgassing characteristics, particle generation, filtration and exhaust systems, noise and vibrations, compliance with standards, and maintenance requirements. By choosing vacuum pumps designed specifically for cleanroom use and considering these key factors, cleanroom operators can maintain the required level of cleanliness and minimize the risk of contamination in their critical processes and products.
What Is a Vacuum Pump, and How Does It Work?
A vacuum pump is a mechanical device used to create and maintain a vacuum or low-pressure environment within a closed system. Here’s a detailed explanation:
A vacuum pump operates on the principle of removing gas molecules from a sealed chamber, reducing the pressure inside the chamber to create a vacuum. The pump accomplishes this through various mechanisms and techniques, depending on the specific type of vacuum pump. Here are the basic steps involved in the operation of a vacuum pump:
1. Sealed Chamber:
The vacuum pump is connected to a sealed chamber or system from which air or gas molecules need to be evacuated. The chamber can be a container, a pipeline, or any other enclosed space.
2. Inlet and Outlet:
The vacuum pump has an inlet and an outlet. The inlet is connected to the sealed chamber, while the outlet may be vented to the atmosphere or connected to a collection system to capture or release the evacuated gas.
3. Mechanical Action:
The vacuum pump creates a mechanical action that removes gas molecules from the chamber. Different types of vacuum pumps use various mechanisms for this purpose:
– Positive Displacement Pumps: These pumps physically trap gas molecules and remove them from the chamber. Examples include rotary vane pumps, piston pumps, and diaphragm pumps.
– Momentum Transfer Pumps: These pumps use high-speed jets or rotating blades to transfer momentum to gas molecules, pushing them out of the chamber. Examples include turbomolecular pumps and diffusion pumps.
– Entrapment Pumps: These pumps capture gas molecules by adsorbing or condensing them on surfaces or in materials within the pump. Cryogenic pumps and ion pumps are examples of entrainment pumps.
4. Gas Evacuation:
As the vacuum pump operates, it creates a pressure differential between the chamber and the pump. This pressure differential causes gas molecules to move from the chamber to the pump’s inlet.
5. Exhaust or Collection:
Once the gas molecules are removed from the chamber, they are either exhausted into the atmosphere or collected and processed further, depending on the specific application.
6. Pressure Control:
Vacuum pumps often incorporate pressure control mechanisms to maintain the desired level of vacuum within the chamber. These mechanisms can include valves, regulators, or feedback systems that adjust the pump’s operation to achieve the desired pressure range.
7. Monitoring and Safety:
Vacuum pump systems may include sensors, gauges, or indicators to monitor the pressure levels, temperature, or other parameters. Safety features such as pressure relief valves or interlocks may also be included to protect the system and operators from overpressure or other hazardous conditions.
It’s important to note that different types of vacuum pumps have varying levels of vacuum they can achieve and are suitable for different pressure ranges and applications. The choice of vacuum pump depends on factors such as the required vacuum level, gas composition, pumping speed, and the specific application’s requirements.
In summary, a vacuum pump is a device that removes gas molecules from a sealed chamber, creating a vacuum or low-pressure environment. The pump accomplishes this through mechanical actions, such as positive displacement, momentum transfer, or entrapment. By creating a pressure differential, the pump evacuates gas from the chamber, and the gas is either exhausted or collected. Vacuum pumps play a crucial role in various industries, including manufacturing, research, and scientific applications.
editor by CX 2023-12-16