Models of compressed air vacuum pumps are typically designated by the prefix "SK" followed by a number; this number represents the rated pumping speed in cubic meters per minute (m³/min). For instance, SK-3 indicates a pumping capacity of 3 m³/min, while the model designation for a two-stage water-ring vacuum pump is the 2SK series.
The key technical parameters of a compressed air vacuum pump include its model, pumping capacity, ultimate vacuum level, motor power, rotational speed, and water consumption [4-5]. Performance parameters are typically measured under the following standard conditions: atmospheric pressure of 0.1013 MPa (760 mmHg), inlet water temperature of 15°C, intake air temperature of 20°C, and relative air humidity of 70%; a performance tolerance of ±10% is permitted. Examples of technical parameters for specific models are as follows: SK-0.15 features a pumping speed of 0.15 m³/min, a motor power of 0.75 kW, and a rotational speed of 2850 r/min; SK-0.4 features a pumping speed of 0.4 m³/min, a motor power of 1.5 kW, and a rotational speed of 2850 r/min; SK-1.5 features a pumping speed of 1.5 m³/min, an ultimate vacuum of -680 mmHg, a motor power of 3 kW, a rotational speed of 1450 r/min, and a water consumption of 10–15 l/min; SK-3 features a pumping speed of 3 m³/min, an ultimate vacuum of -710 mmHg, a motor power of 5.5 kW, a rotational speed of 1450 r/min, and a water consumption of 15–20 l/min; SK-6 features a pumping speed of 6 m³/min, an ultimate vacuum of -710 mmHg, a motor power of 11 kW, a rotational speed of 970 r/min, and a water consumption of 20–30 l/min; SK-12 features a pumping speed of 12 m³/min, a motor power of 18.5 kW, a rotational speed of 970 r/min, and a water consumption of 40–50 l/min; SK-20 features a pumping speed of 20 m³/min, a motor power of 37 kW, a rotational speed of 740 r/min, and a water consumption of 60–80 l/min; SK-30 features a pumping speed of 30 m³/min, a motor power of 55 kW, a rotational speed of 740 r/min, and a water consumption of 70–100 l/min; SK-42 features a pumping speed of 42 m³/min, a motor power of 75 kW, a rotational speed of 740 r/min, and a water consumption of 95–130 l/min.
