US 12,352,484 B2
Heat source unit and refrigeration device
Shuichi Taguchi, Osaka (JP); and Masaaki Takegami, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jan. 27, 2022, as Appl. No. 17/586,349.
Application 17/586,349 is a continuation of application No. PCT/JP2020/025155, filed on Jun. 26, 2020.
Claims priority of application No. 2019-154544 (JP), filed on Aug. 27, 2019.
Prior Publication US 2022/0146172 A1, May 12, 2022
Int. Cl. F25B 49/02 (2006.01); F25B 9/00 (2006.01); F25B 31/00 (2006.01); F25B 41/20 (2021.01)
CPC F25B 49/022 (2013.01) [F25B 9/008 (2013.01); F25B 31/004 (2013.01); F25B 41/20 (2021.01); F25B 2309/06 (2013.01); F25B 2313/02732 (2013.01); F25B 2400/072 (2013.01); F25B 2400/13 (2013.01); F25B 2500/07 (2013.01); F25B 2600/0261 (2013.01); F25B 2600/027 (2013.01); F25B 2700/1931 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A heat source unit constituting a refrigeration apparatus by being connected to a utilization-side unit, the heat source unit comprising:
a low-stage compression element; a high-stage compression element; a heat exchanger; and a controller, wherein
the low-stage compression element has a discharge pipe provided with a pressure switchgear,
the high-stage compression element compresses a refrigerant discharged from the low-stage compression element,
the controller is configured to pause an operation of the low-stage compression element in response to activation of the pressure switchgear, and pause an operation of the high-stage compression element once and restart the operation of the high-stage compression element while the operation of the low-stage compression element is kept paused, thereby allowing refrigerant remaining in the discharge pipe of the low-stage compression element to be sucked by the high-stage compression element so as to reduce the pressure at the discharge pipe of the low-stage compressor element before restarting the low-stage compression element.