US 12,416,434 B2
Refrigerant vessel and refrigeration cycle apparatus
Kumiko Saeki, Osaka (JP); Yuta Iyoshi, Osaka (JP); and Yoshiki Yamanoi, Osaka (JP)
Assigned to Daikin Industries, Ltd., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 29, 2024, as Appl. No. 18/622,036.
Application 18/622,036 is a continuation of application No. PCT/JP2022/035473, filed on Sep. 22, 2022.
Claims priority of application No. 2021-161999 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0240843 A1, Jul. 18, 2024
Int. Cl. F25B 41/40 (2021.01); F25B 43/00 (2006.01); F25B 49/02 (2006.01); F25B 7/00 (2006.01); F25B 9/00 (2006.01)
CPC F25B 41/40 (2021.01) [F25B 43/006 (2013.01); F25B 49/022 (2013.01); F25B 7/00 (2013.01); F25B 9/008 (2013.01); F25B 2400/02 (2013.01); F25B 2400/16 (2013.01); F25B 2400/23 (2013.01); F25B 2600/25 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A refrigerant vessel that reserves a refrigerant containing a carbon dioxide refrigerant in a refrigerant circuit in which the refrigerant and a refrigerating machine oil circulate, the refrigerant vessel comprising:
a vessel body including a cylindrical member and a bottom member that is welded and fixed to the cylindrical member and has a vertical direction as the thickness direction;
a first refrigerant pipe connected to the vessel body;
a second refrigerant pipe connected to the vessel body; and
a third refrigerant pipe connected to the vessel body, wherein
the bottom member has a concave curved surface facing a space inside the refrigerant vessel and is concaved downwardly,
the refrigerating machine oil is incompatible with the refrigerant and has a density higher than a density of the refrigerant,
an opening of the first refrigerant pipe is above an opening of the second refrigerant pipe and below an opening of the third refrigerant pipe in the vessel body,
the first refrigerant pipe includes a portion that extends in a downward direction within the vessel body and has an opening formed to be inclined with respect to an axial direction in which the first refrigerant pipe extends,
the second refrigerant pipe extends in the downward direction from the bottom member of the vessel body,
an opening of the second refrigerant pipe is offset from the opening of the first refrigerant pipe in a second direction perpendicular to the downward direction such that when the refrigerating machine oil is inserted into the vessel body via the opening of the first refrigerant pipe, the refrigerating machine oil guided by the concave curved surface of the bottom member to the opening of the second refrigerant pipe, the opening of the first refrigerant pipe being inclined away from the opening of the second refrigerant pipe, and
the bottom member includes an indented cylindrical member with an indented cylindrical shape, with the vertical direction as the thickness direction, and includes the downward concave curved surface facing a space inside the refrigerant vessel forming an indent in the indented cylindrical shape.