US 12,111,097 B2
Refrigeration apparatus
Takashi Toyooka, Saitama (JP); Minoru Suto, Gunma (JP); and Fumihiro Asayama, Ehime (JP)
Assigned to PHC HOLDINGS CORPORATION, Tokyo (JP)
Filed by PHC HOLDINGS CORPORATION, Tokyo (JP)
Filed on Jan. 20, 2022, as Appl. No. 17/580,338.
Application 17/580,338 is a continuation of application No. PCT/JP2020/024673, filed on Jun. 23, 2020.
Claims priority of application No. 2019-134600 (JP), filed on Jul. 22, 2019.
Prior Publication US 2022/0146185 A1, May 12, 2022
Int. Cl. F25D 23/06 (2006.01); F25D 11/02 (2006.01)
CPC F25D 23/061 (2013.01) [F25D 11/02 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A refrigeration apparatus comprising:
an inner box with an internal space enclosed by a top surface, a side surface, and a bottom surface; and
a two-way refrigeration circuit including a high-temperature side refrigeration circuit and a low-temperature side refrigeration circuit, which are configured to exchange heat with each other, wherein:
the internal space is partitioned by a partition plate into a plurality of cooling chambers, among which ventilation is enabled,
the low-temperature side refrigeration circuit includes a low-temperature side evaporator that is a pipe disposed outside the inner box, the pipe including a top surface part in contact with the top surface, an upper side surface part in contact with the side surface, and a lower side surface part in contact with the side surface at a position lower than the upper side surface part so as to surround the internal space,
the upper side surface part includes a plurality of pipe sections arranged at even intervals of a first pitch in a vertical direction,
the lower side surface part includes a plurality of pipe sections arranged at even intervals of a second pitch greater than the first pitch in the vertical direction,
the upper side surface part is directly connected to the lower side surface part at the side surface of the inner box,
a sum of lengths of a pipe forming the top surface part and the pipe forming the upper side surface part is equal to or greater than 62.5% of a length of the pipe in contact with the inner box, and
a length of a pipe in contact with the bottom surface is smaller than 8.0% of the length of the pipe in contact with the inner box.