초록 ▼

The invention relates to a rotary displacement compressor having volume ratio regulation. A connection channel (8,9,10) connects the working space of the compressor to the pressure channel (5). In the channel (8,9,10) there is provided means (13) for sensing the direction of flow through the channel

The invention relates to a rotary displacement compressor having volume ratio regulation. A connection channel (8,9,10) connects the working space of the compressor to the pressure channel (5). In the channel (8,9,10) there is provided means (13) for sensing the direction of flow through the channel. The direction of flow is an indication of whether there is over or under compression. Signals from the flow direction sensing means (13) affect the position of a movable edge (29) of the outlet port (32) so that this edge (29) will move to a position where the internal compression complies with the outlet pressure. By using the direction of flow as the governing parameter for the volume ratio regulation instead of the pressure difference or the power consumption of the prime mover according to known technique, a more accurate adaption of the volume ratio to the outlet pressure is achieved.

대표청구항 ▼

A rotary displacement compressor having at least one rotor (6) mounted in a working space formed by a casing (1, 2, 3, 7) surrounding the rotor(s) (6), in which working space a gaseous working fluid is transported and compressed in compression chambers from an inlet port (31) connected to a suction

A rotary displacement compressor having at least one rotor (6) mounted in a working space formed by a casing (1, 2, 3, 7) surrounding the rotor(s) (6), in which working space a gaseous working fluid is transported and compressed in compression chambers from an inlet port (31) connected to a suction channel (4) to an outlet port (32) connected to a pressure channel (5), said outlet port having an edge (29) determining the moment of opening for a compression chamber towards the outlet port (32), the position of said edge (29) being adjustable by actuating means (15, 16) governed by sensing means (13), characterized in that the compressor is provided with a connection channel (8, 9, 10) having one end (11) in communication with the pressure channel (5) and a second end (12) in communication with the working space in an area adjacent the outlet port (32) of the compressor, said sensing means (13) including a flow direction indicating means (13) in the connection channel (8, 9, 10) for indicating the direction of flow in the connection channel (8, 9, 10), said actuating means (15, 16) being arranged to displace said edge (29) in a direction towards a later occurrence of said moment of opening when sensing a direction of flow in the connection channel (8, 9, 10) from said one end (11) to said second end (12) and to displace said edge (29) in a direction towards an earlier occurrence of said moment of opening when sensing a flow in the opposite direction.