High Efficiency Liquid Ring Type Vacuum Pump SK Series Large Capacity for industrial

The SK series is a line of large-capacity, high-efficiency liquid ring vacuum pumps

I. Introduction

The SK series is a line of large-capacity, high-efficiency liquid ring vacuum pumps and compressors designed and manufactured in China. Compared to the SZB series, the SK series offers significantly greater pumping capacity and higher vacuum levels, positioning it as a medium to large industrial-grade liquid ring pump. Its core working principle is the same as all liquid ring pumps: an eccentrically mounted impeller rotates within the pump casing, forming a liquid ring. The sealed chambers between the liquid ring and impeller blades change volume cyclically to achieve gas intake, compression, and discharge.

A key feature of this series is its dual functionality as both a vacuum pump and a compressor. When used for suction, it is a vacuum pump. When its inlet is connected to the atmosphere (or a gas source) and its outlet to a system, it functions as a low-pressure compressor, delivering compressed gas typically at discharge pressures not exceeding 0.1-0.2 MPa (G).

II. Advantages

1. High Gas Handling Capacity: The SK series is designed for high-volume gas transfer, with pumping speeds far exceeding smaller pumps like the SZB series.

2. Robust Construction & High Reliability: Built with heavy-duty industrial design using cast steel or iron, it withstands long-term continuous operation, making it suitable for heavy industrial environments.

3. Isothermal Compression & Extreme Safety: The minimal temperature rise during compression makes it ideal for handling flammable, explosive, hot gases, and organic solvents, offering unparalleled safety.

4. Handles Complex Media: Capable of pumping or compressing wet, dirty gases containing significant moisture, dust, and corrosive components, even gas-liquid mixtures, without pump damage.

5. Good Balance & Low Vibration: Axial and radial forces are well-balanced in the design, resulting in smooth operation with relatively low vibration and noise.

6. Dual-Purpose Machine: Functions as both a vacuum pump and a compressor, broadening its application scope.

III. Key Technical Parameters

• Model Example: SK-1.5, SK-6, SK-12, SK-20, SK-30, SK-42, SK-60, SK-85, SK-120 (The number often represents the air volume in m³/min at a specific vacuum level).

• Pumping Speed (as Vacuum Pump): Ranges from ~1.5 to over 120 cubic meters per minute.

• Ultimate Vacuum (as Vacuum Pump): Can reach -0.090 MPa to -0.096 MPa (90% ~ 96% vacuum degree, or 10kPa ~ 4kPa abs. pressure). Can be lower with an air ejector.

• Discharge Pressure (as Compressor): Typically up to 0.1 ~ 0.2 MPa (G).

• Motor Power: Ranges from tens of kilowatts to several hundred kilowatts, providing substantial power.

• Operating Liquid Flow: Requires a continuous supply of sealing liquid, with flow rate dependent on pump model and operating conditions.

• Material of Construction: Main components are typically cast iron (HT250). Critical components or pumps for corrosive duties can be supplied in stainless steel.

IV. Application Fields
The SK series is widely used in heavy industry and process industries due to its high capacity and durability:

• Vacuum Applications (as Pump):

  • Power Industry: Evacuation of large condensers in thermal power plants (a core application).

  • Chemical & Petroleum Industries: Vacuum filtration, vacuum distillation, evaporation, crystallization, VOC recovery.

  • Paper Industry: Vacuum dewatering, pulp suction.

  • Coal Mining Industry: Methane gas drainage.

  • Metallurgical Industry: Steel degassing.

• Pressure Applications (as Compressor):

  • Pressure Transfer: Transferring various gases like chlorine, biogas, and natural gas.

  • Pneumatic Conveying: Used in systems for pneumatically conveying powdered materials like fly ash in power plants or cement.

  • Process Boosting: Providing a low-pressure gas source for chemical reactions or industrial processes.

  • Fermentation Aeration: Supplying sterile air for bio-fermentation processes.