公开(公告)号：US10557648B2

公开(公告)日：2020-02-11

申请号：US15618321

申请日：2017-06-09

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Koji Naito ,  Naoyuki Fushimi ,  Kazumoto Urata ,  Gen Yasuda ,  Kazunori Fukuda

IPC: F25B13/00 ,  F25B49/02

Abstract: A cooling/heating switching unit includes first to third fittings, expansion valves and expansion-valve driving sections, a housing, a heat insulating material, and a refrigerant leak detection sensor. The first and second fittings respectively connect with a high/low-pressure-gas main pipe and a low-pressure-gas main pipe, which are linked to an outdoor unit. The third fitting connects with an indoor-unit connection pipe, which is linked to indoor units. The expansion valve for high/low-pressure-gas pipe, the expansion valve for low-pressure-gas pipe, and expansion-valve driving sections selectively connect the first or second fitting with the third fitting via a refrigerant pipe to control a flow direction of refrigerant. The housing houses the refrigerant pipe. The heat insulating material fills inside of the housing to insulate the refrigerant pipe arranged inside of the housing from heat. The refrigerant leak detection sensor is installed outside of the housing to detect leaked refrigerant.

公开(公告)号：US10527322B2

公开(公告)日：2020-01-07

申请号：US15758419

申请日：2015-09-11

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Koji Naito ,  Kazumoto Urata ,  Kazuhiko Tani ,  Masayoshi Murofushi ,  Gen Yasuda

IPC: F25B13/00 ,  F25B41/06 ,  F25B49/02

Abstract: Provided is a air conditioner including high-and-low-pressure gas pipe expansion valves each of which is provided to a corresponding one of the cooling-heating switching units and adjusts feeding of high-temperature and high-pressure gas refrigerant to the corresponding indoor unit; and a refrigeration cycle controller which adjusts a valve opening degree of the high-and-low-pressure gas pipe expansion valve of the cooling-heating switching unit connected to one of the indoor units which is not in heating operation, in accordance with a determination result on excess or deficiency of refrigerant in a refrigeration cycle.

公开(公告)号：US10907902B2

公开(公告)日：2021-02-02

申请号：US15758416

申请日：2015-09-10

Applicant: Hitachi-Johnson Controls Air Conditioning, Inc.

Inventor： Mikihito Tokudi ,  Koji Naito ,  Kazumoto Urata ,  Kenji Matsumura ,  Kazuhiko Tani ,  Masayoshi Murofushi ,  Takumi Kamiaka

IPC: F28D1/04 ,  F25B39/00 ,  F28D1/047 ,  F28F9/26 ,  F28D21/00 ,  F28F1/32 ,  F25B39/04

Abstract: A heat exchanger includes: a gas-side port connected to piping for a gaseous refrigerant; a liquid-side port connected to piping for a liquid refrigerant; a refrigerant path that links the gas-side port to the liquid-side port; at least four heat exchange part regions that perform heat exchange between air and the refrigerant flowing through the refrigerant path; and a branching and merging part that branches and merges the refrigerant path to connect the heat exchange part regions in series between the gas-side port and the liquid-side port through the refrigerant path. The heat exchange part regions are connected to each other through the branching and merging part so as to allow the number of refrigerant paths provided in the heat exchange part region near the gas-side port to be greater than the number of refrigerant paths provided in the heat exchange part region near the liquid-side port.