Gardner Denver Deutschland Gmbh

Ulrich Thomes

Frank Georg Klaus

Marc Schiel

Nicolas Henn

A cooling arrangement for an at least two-stage compressed air generator comprises an intercooler arranged between a first and a second compressor stage, an aftercooler arranged after the second compressor stage, and a subassembly cooler, which absorbs heat from further subassemblies of the compressed air generator. A coolant circuit comprises a main cooler, the cold side supplying a cooled coolant parallel to the respective coolant inlet of the intercooler, of the aftercooler and of the subassembly cooler, and the hot side receiving the heated coolant exiting in parallel at the respective coolant outlet of the intercooler and of the aftercooler. The coolant outlet of the subassembly cooler is connected to a feed inlet of the intercooler and/or of the aftercooler.

Cooling arrangement and method for cooling an at least two-stage compressed air generator

The invention relates to a method for controlling a rotary screw compressor, having at least a first and a second air-end, wherein both air-ends are driven separately from one another and speed controlled. According to the invention, the following steps are carried out: detection of a volume flow taken at the outlet of the second air-end; adjustment of the rotational speed of both air-ends, when the removed volume flow fluctuates in a range between a maximum value and a minimum value; opening of a pressure-relief valve, if the volume flow falls below the minimum value; and reduction of the rotational speed of at least the first air-end to a predetermined idling speed (V1) to reduce the volumetric flow delivered by the first to the second air-end.

Method for controlling a rotary screw compressor

The invention relates to a screw compressor for compressing a medium, having a drive unit which has a drive, and having a compressor unit which has two mutually engaging rotors with screw profiles, which are complementary to one another, and a compressor housing having an inlet and an outlet. The rotors are coupled to the drive unit via a shaft in each case. The shafts are only mounted on the drive side of the rotors. The rotors are mounted only on one side relative to their axial direction and are not mounted on the side which faces axially away from the drive. The invention furthermore relates to a screw compressor arrangement with screw compressors which are fluidically connected in series.

Screw compressor having rotors mounted on one side

A cooling arrangement for an at least two-stage compressed air generator. The cooling arrangement comprises an intercooler arranged between a first and a second compressor stage, an aftercooler arranged after the second compressor stage, and a subassembly cooler, which absorbs heat from further subassemblies of the compressed air generator. A coolant circuit comprises a main cooler, the cold side supplying a cooled coolant parallel to the respective coolant inlet of the intercooler, of the aftercooler and of the subassembly cooler, and the hot side receiving the heated coolant exiting in parallel at the respective coolant outlet of the intercooler and of the aftercooler. The coolant outlet of the subassembly cooler is connected to a feed inlet of the intercooler and/or of the aftercooler.

The invention is related to a pulsation muffler () for a gaseous medium flow (), which is supplied by a compressor. The pulsation muffler () comprises a housing () extending along a central axis with a medium flow inlet () and a medium flow outlet; several tubular absorber elements () concentrically arranged in the housing () and fluidically arranged one behind the other. Each tubular absorber element () is provided with an inlet area and an outlet area, positioned at an axial distance from each other. Between the respective radially adjacent wall sections of different absorber elements (), a flow compartment () is maintained for the medium flow ().

Pulsation mufflers for compressors

A compressor system () with a system housing (), in which are arranged heat generating system components () comprising at least one compressor stage () for compressing a gaseous medium, an air water cooler (), a blower () which generates a cooling air flow (), and air conducting elements. A cooling air channel () is configured which has an inlet opening () in the upper section of the system housing () and an outlet opening () in the lower section of the system housing (), wherein upper air conducting elements () are positioned in order to conduct the cooling air flow () after flowing through the air water cooler () to the inlet opening (), and lower air conducting elements () are positioned in order to conduct the cooling air flow () from the outlet opening () to the system components ().

Compressor system with internal air-water cooling

A mixing valve arrangement for a hydraulic system is provided with a medium cavity, in which a mixing cylinder, a first and a second inlet chamber as well as an outlet are provided. A mixing piston is axially mounted and movable in the mixing cylinder, provided with a flow path with an inlet opening, a variable cross-section of said inlet opening culminating into the first and/or the second inlet chamber, according to the axial position of the mixing piston, and with an outlet opening culminating in the outlet of the mixing cylinder. A thrust rod is axially mounted and movable and connected to the mixing piston, to change the axial position thereof. A drive is connected as an actuator to the thrust rod, for the axial movement of the same. The drive is an electrical motor, which is completely arranged inside the medium cavity.

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Kuelz, Germany

Ulrich Thomes