US 11,988,429 B2
Control unit for a refrigerant compressor
Jens Mannewitz, Schkeuditz (DE); Tobias Fuhrer, Rottenburg a.N. (DE); and Patrick Schneider, Herrenberg (DE)
Assigned to BITZER Kuehlmaschinenbau GmbH, Sindelfingen (DE)
Filed by BITZER Kuehlmaschinenbau GmbH, Sindelfingen (DE)
Filed on Jul. 9, 2021, as Appl. No. 17/372,072.
Claims priority of application No. 102020118740.8 (DE), filed on Jul. 15, 2020.
Prior Publication US 2022/0018582 A1, Jan. 20, 2022
Int. Cl. F25B 49/02 (2006.01)
CPC F25B 49/022 (2013.01) [F25B 49/025 (2013.01); F25B 2600/0253 (2013.01); F25B 2700/171 (2013.01); F25B 2700/21155 (2013.01); F25B 2700/21156 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A refrigerant compressor for refrigeration plants, comprising:
a compressor unit driven by a drive unit, wherein the compressor and drive units fare provided with a control unit which is controllable by means of a delivery rate control system in order to control the refrigerant compressor at different delivery rates, and wherein an external delivery rate setpoint value is communicated to the delivery rate control system;
wherein the delivery rate control system is configured to acquire, by means of a sensor, a compressor reference temperature of the compressor unit, the delivery rate control system being configured to ascertain an operating state value group for acquisition of an operating state of the refrigerant compressor;
wherein the delivery rate control system is configured to ascertain the operating state value group based upon both the acquired compressor reference temperature and the delivery rate;
wherein the delivery rate control system uses specified reference values to differentiate between critical and non-critical operating states of the refrigerant compressor; and
wherein, if at least one value of the ascertained operating state value group, based upon the compressor reference temperature, permits a critical operating state of the refrigerant compressor, the delivery rate control system specifies a delivery rate to operate the refrigerant compressor outside of the critical operating state.