Pneumatic pumps for single-line centralized lubrication systems
The pneumatic pump belongs to the group of diaphragm pumps and is mainly used in single-line central lubrication systems for the intermittent provision of lubricant for various lubrication points. Single-line systems do not work with a constant, circulating volume flow, but supply the consuming end units at intervals depending on the time or machine cycle. In this way, the continuous loss of lubricant due to evaporation and aging can be compensated.
In addition to the pneumatic pump, a single-line centralized lubrication system consists of a metering device for distributing the required amount of lubricant as well as the main tube and lubrication lines. In addition, components such as control units and monitoring devices or pressure switches are used in the periphery of the system to ensure proper function of the lubrication system. Pneumatically operated piston pumps such as the POEP-15 or PFEP-15 models can be used for single-line systems with oil or fluid grease, depending on the type, and deliver quantities of up to 15 cm³ of lubricant per stroke.
Technical background to the pneumatic pump
The operation of a pneumatic pump is essentially based on a membrane, which generates the necessary delivery pressure for the transport of the lubricant by means of contracting movements. In principle, the kinetic energy of the membrane can be generated hydraulically, pneumatically, electromagnetically or mechanically. Compressed air is used in the pneumatic pump to build up the required pressure.
Pneumatic pumps like the POEP-15 or the PFEP-15 consist of a double housing in which two diaphragms are connected by a rod. While the membranes on the outside are surrounded by the pumped medium, the inside is pressurized with compressed air. When the lubricant is pumped, pressure is first built up in the membranes until the end position is reached. By throttling the pressure, the stored energy is then transferred to the pumped medium and converted into kinetic energy. The main advantage of this functional principle is the possibility to adjust the delivery volume very precisely by reducing the pressure. The relatively large fluctuations in the delivery pressure are no problem for single-line centralized lubrication systems.
Advantages of pneumatic pumps in single-line systems
Pneumatically operated piston pumps are ideal for use in single-line centralized lubrication systems. Consumption or loss lubrication as a single-line system is used in small to medium-sized systems in a wide variety of industries. The application spectrum ranges from machine tools and packaging machines to compressors, escalators and textile machines to wind turbines.
The main advantage of single-line systems with a pneumatic pump is the precise metering of the lubricant per lubrication point. In addition, thanks to the modular principle, the system can easily be expanded to include additional consuming end units. Local systems as well as more complex machines and entire production lines can be supplied with lubricant using pneumatic pumps. Single-line systems can be designed relatively simply and are characterized by uncomplicated operation and monitoring.
Pneumatic pumps type POEP-15 and PFEP-15
The pneumatically operated piston pump of type PEOP-15 is suitable for pumping oil and, depending on the application, can be equipped with reservoirs of sizes 0.5, 1.0 or 1.7 liters. 15 cm³ of lubricant are conveyed at a maximum operating pressure of 60 bar per stroke. If greases of NLGI classes 000 or 00 are pumped, the pneumatic pump type PFEP-15 is suitable. It also delivers 15 cm³ of lubricant per stroke. The valve set required for pressure relief and pressure limitation is already provided for the POEP-15 and PFEP-15 models.