II. Core Basic Parameters 

Air extraction rate: 108 – 4320 m³/h (30 – 2500 L/s). Test standard: inlet pressure 100 Pa, intake temperature 20℃, atmospheric pressure 101325 Pa. Measured performance deviation ≤ ±6% 

2. Ultimate vacuum level: ≤ 50 Pa (under normal operating conditions), optimized model ≤ 20 Pa, far exceeding the vacuum level of a single vertical oil-free reciprocating pump. 

3. Working pressure range: 0.1 atm to 10 Pa, covering the entire range of low and medium vacuum levels, suitable for continuous gas extraction requirements across multiple process stages 

4. Startup method: Linked start-stop control. The reciprocating pre-pump is started first. Once the system pressure drops to the set threshold (≤1330Pa), the Roots booster pump will automatically delay its startup to prevent overload and jamming. 

5. Motor Configuration: The unit is equipped with dual motors. The power of the reciprocating pump motor ranges from 3 to 110 kW, while the power of the Roots pump motor is from 2.2 to 22 kW. All are Y-series three-phase asynchronous motors with a protection level of IP54. Customized explosion-proof and variable-frequency models are also available. 

6. Operating temperature rise: Under rated operating conditions, the reciprocating pump experiences a temperature rise of no more than 40°C after continuous operation for 2 hours, and the bearing temperature of the Roots pump does not exceed 75°C. There is no risk of overheating and causing a shutdown. 

7. Noise Index: ≤ 85 dB(A). The unit is equipped with a standard shock-absorbing base, significantly reducing the vibration and noise during the operation of the reciprocating pump. 

8. Working environment temperature: -10℃ to 45℃, environmental humidity ≤ 85%RH (no condensation). For high-humidity conditions, an air-water separator can be used in conjunction. 

9. Cooling method: The reciprocating pump is equipped with water cooling by default. The Roots pump is naturally air-cooled with water cooling added. For large power units, the overall water cooling can be upgraded for stable heat dissipation. 

10. Protection device: Standardly equipped with motor overload protection, pump body over-temperature protection, inlet and outlet pressure difference protection, and vacuum check valve anti-backflow protection. The operational safety is very high. 

III. Structure and Core Configuration Parameters 

• Unit structure: Horizontal integrated frame design, with a split layout of reciprocating pump and Roots pump. The structure is compact, occupies a small space, does not require complex concrete foundation, and is easy to install and debug. 

• Reciprocating pump body: HT250 gray cast iron pump body, all made of stainless steel, complete series of titanium alloy, Hastelloy alloy materials or stainless steel inner liner piston/cylinder liner, oil-free self-lubricating piston ring seal, wear-resistant and corrosion-resistant, no oil contamination. 

• Rotz pump body: QT600 ductile iron synchronous rotor, HT250 gray cast iron pump body, precise clearance design, no mechanical friction, smooth operation 

• Sealing configuration: The reciprocating pump uses a dedicated oil-free packing seal, while the Roots pump employs a frame oil seal combined with a mechanical seal. The dual sealing system ensures no leakage and eliminates oil mist evaporation. 

• Lubrication method: All pumps adopt external vacuum pump oil lubrication for the bearings. The pump chambers are completely oil-free throughout, completely eliminating the possibility of the medium being contaminated by the lubricating oil. This significantly reduces the need for frequent oil replacement and maintenance. 

• Pipeline configuration: Standard equipment includes vacuum check valve, vacuum pressure gauge, differential pressure controller, exhaust filter. Optional equipment includes vacuum gauge, solenoid valve, steam-water separator. 

• Control method: Standardly equipped with manual linkage control. Optional PLC fully automatic control system is also available, enabling automatic start/stop, fault alarm, and remote monitoring functions. 

IV. Interface Specification Parameters 

Total suction inlet diameter of the unit: DN50, DN80, DN100, DN125, DN150, DN200. DN250 can be customized as per customer's requirements. 

Exhaust pipe diameter: DN40, DN50, DN80, DN100, DN150, DN20 

Cooling water pipe interface: Standard G1/2" and G3/4" threads 

European standard: RF concave flange in accordance with national standards. Customizable KF quick-connect flange and chemical industry standard flange can be provided upon request. The installation direction is flexible and adjustable, suitable for on-site pipeline layout. 

V. Detailed Parameter Table of Typical Models

VI. Applicable Conditions and Customized Services 

Purgeable medium: Clean air, steam, inert gas, non-corrosive organic vapor. Can tolerate a small amount of non-viscous and non-hard dust-containing gas. It is strictly prohibited to purge flammable, explosive, strongly corrosive, or media containing viscous particles. 

2. Intake medium temperature: Standard ≤ 80℃. Customizable high-temperature version ≤ 120℃. Suitable for exhaust gas extraction requirements in high-temperature processes. 

3. Core application scenarios: Chemical vacuum distillation, vacuum drying, food vacuum preservation, pharmaceutical filtration and purification, metallurgical vacuum degassing, building material vacuum molding, environmental wastewater vacuum filtration, industrial material transportation 

4. Customization Options: Customizable Ex d IIB T4 explosion-proof type, all-stainless-steel anti-corrosion type of reciprocating pump, variable-frequency speed control type, closed-loop water-cooling water-saving type; optional installation of steam-water separator, vacuum buffer tank, and remote monitoring system. 

5. Ancillary Services: Offer on-site installation and commissioning of the equipment, operation and maintenance training for the operators, on-site after-sales maintenance services, overall design of the vacuum system, and support for customized and special-sized modifications with non-standard dimensions. 

VII. Operating Precautions 

The crew strictly follows the startup sequence of the reciprocating pre-pump being started first, followed by the start-up of the Roots booster pump. It is strictly prohibited to start the Roots pump alone or to do so prematurely, to prevent the motor from overloading and burning out, or the rotor from getting stuck. 

Before starting, make sure that the cooling water pipeline of the reciprocating pump is unobstructed, and confirm that the cooling water flow meets the standard. It is strictly prohibited for the reciprocating pump to run without water to avoid overheating and damage to the pump body. 

Before operation, check the sealing performance of the pipeline connections of the unit, the flexibility of the vacuum check valve, and identify any air leakage points. Eliminate the occurrence of vacuum backflow and pipeline leakage, which may cause a decline in the pumping performance. 

During operation, real-time monitoring is conducted of the water temperature of the reciprocating pump, the temperature rise of the pump body, the motor current, the bearing temperature of the Roots pump, and the vacuum degree of the unit. Continuous operation under conditions of excessive temperature, pressure or overload is strictly prohibited. 

Regularly inspect the packing seal and piston ring wear of the reciprocating pump, and replace the aged sealing components in time; replace the lubricating grease for the bearings of the dual pumps every 2500-3000 hours to ensure the lubrication effect. 

When shutting down, first turn off the Roots booster pump. Wait for 5 to 8 minutes until the system pressure returns to normal, then turn off the reciprocating pump at the previous stage, and simultaneously close the cooling water valve to prevent the medium from flowing back and contaminating the pump body. 

After the winter shutdown, the accumulated water in the pump body and the cooling pipeline of the reciprocating pump must be drained to prevent the pump body and pipeline from freezing and cracking. For long-term shutdowns, the rotor of the dual pumps should be rotated regularly to avoid rotor jamming. 

Service hotline: 0533-8225516  1506431898