Other

Leybold Vakuum Gmbh

R-718 Spindel Gbr

Combipart Gmbh

Steffens, Ralf

Ralf Steffens

Hartmut Kriehn

Klaus Rofall

Manfred Behling

Steffen Klein

A water-based refrigerant for a thermal working machine. The refrigerant for a thermal working machine () having an evaporator (A), a condenser (B), a compressor (C), and a throttle element (D). The refrigerant is based on water and comprises a refrigerant component with a hydroxyl group, for example in the form of ethanol. The use of such a mixture as a refrigerant for a thermal working machine and for a thermal working machine having such a refrigerant, and to a method for operating a thermal working machine having such a refrigerant is also disclosed.

Water-based refrigerant for a thermal working machine and thermal working machine having such a refrigerant

Compression of water vapour as R718 is disclosed with and without addition of additives as an aqueous solution in rotational displacement machines, i.e. refrigeration, air-conditioning and heat pump technology. To largely avoid over or under-compression, it is proposed for the easiest possible adaptation of the currently effective internal volume ratio as so-called iV value in the displacer that the compressor housing starting from the outlet side with rotor profile length Lover a length Lcomprises planar, i.e. flat iV disks () with the index j for 1≤j≤n; n is the number of disks; n≥1 with a width bper iV disk having planar surfaces Ppreferably perpendicular to the neutral axis A. The iV disks are displaced in a targeted manner individually by movement control devices () per iV disk in each case by a distance swhere 0<s≤s.

Volume ratio for a R718* compressor

The invention relates to a spindle compressor without operating fluid in the working space with a 2-tooth spindle rotor and a 3-tooth spindle rotor in a surrounding compressor housing-and preferably non-parallel rotation axes of the two spindle rotors, in particular for use in compression refrigeration machines. In order to improve the degree of efficiency while providing flexible power adjustment, it is proposed according to the invention that a multi-stage spindle compressor be used as a refrigerant compressor, whose compressor housing and whose spindle rotors are cooled via a partial-flow branch-off of liquid refrigerant from the refrigerant main flow circuit, wherein the compressor housing is cooled in a controlled manner by means of refrigerant evaporation, with the refrigerant vapor being subsequently fed to the inlet, and that, for power adjustment, there are also post-inlet feeds into the working space in addition to the inlet feed, and also pre-outlet discharges in addition to the outlet discharge from the outlet space, each with their own regulating device.

Spindle compressor using refrigerant cooling for housing and rotor

The invention relates to a dry-compressing dual-shaft rotary displacement screw spindle pump machine for delivering and compressing gases. The spindle rotor pair therein includes multiple stages, having a primary delivery thread, a secondary delivery thread and a gas outlet collector chamber therebetween. The primary delivery thread head circle diameter decreases in the gas outlet direction, while the foot circle diameter thereof increases correspondingly for an application-specific matching inner 'integral' compression ratio. The secondary delivery thread nominal delivery direction is opposite to the primary delivery thread nominal delivery direction. The secondary delivery thread is implemented such that the actual gas flow direction is opposite to the nominal delivery direction thereof, and is always directed away from the gas outlet plenum, having a gas permeation under ambient pressure just as the space in the gearbox. A control gas delivery stage is additionally provided for very high operating pressures.

Displacement pump with internal compression

A screw-type vacuum pump () includes a pump housing () with rotors (). A liquid cooling system cools the rotors and a drive motor (). In order to improve the cooling of said pump, an external air-flow impelled cooling system is also provided for the pump housing ().

Cooled screw-type vacuum pump

The invention concerns a screw pump ( ) that is configured as a dual-shaft positive displacement motor and that comprises two positive displacement spindle rotors ( and ) rotating in opposite directions and having external toothing. In order to provide a quiet and simple drive mechanism for said rotors ( and ) while ensuring synchronization and increased rotational speed, contrate gear-like gearwheels ( and ) are mounted on both rotors ( and ) rotating in opposite directions or the rotor spindles in a corresponding plane, in which a larger contrate gear-like driving toothed wheel ( ) engages in such a way that both spindle rotors ( and ) are driven in opposite directions at an increased rotational speed, wherein said contrate gear similarity also includes a crown gear with internal and external toothing working in connection with front toothed wheels or bevel gears and the possibility that only the driving toothed wheel ( ) or only the driven gearwheels ( and ) are contrate gear-like.

Drive mechanism for a screw pump

A dry-compressing screw pump in the form of a two-shaft positive displacement pump. A first and a second rotor spindle are disposed parallel to each other. The rotor spindles are hollow. A cooling medium is fed at a first front face of the rotor spindles and evacuated at a second front face of the rotor spindles. A cooling medium feeding and evacuation means is connected to an external cooling medium circuit. The inner diameter of the rotor spindles monotonously increases from the first front face toward the second front face so that the cooling medium is conveyed from the first front face to the second front face substantially under the influence of centrifugal force acting on the cooling medium due to the rotation of the rotor spindle.

Growing community of inventors

Esslingen, Germany

Ralf Steffens