Daikin Industries, Ltd.

Takuya Horita

Masaaki Takegami

Akitoshi Ueno

Mikio Kajiwara

Shigeki Kamitani

Fumiaki Koike

Daisuke Okamoto

Shuichi Taguchi

Naoto Tomioka

Yohei Nishide

Yousuke Ohnishi

Daiki Hirawa

Masaaki Adachi

Yuusuke Tanaka

Taichi Koshiji

Naoto Kimura

Takashi Tsujiuchi

A refrigeration apparatus includes a gas-liquid separator on a downstream side of a radiator, and a refrigerant circuit in which a high pressure of a refrigeration cycle is equal to or higher than a critical pressure. The refrigeration apparatus includes a gas passage that communicates with the gas-liquid separator and at least one of a plurality of heat exchangers provided in the refrigerant circuit, and an opening and closing device that opens and closes the gas passage. There is provided a controller that opens the opening and closing device when a pressure in the gas-liquid separator is equal to or higher than a predetermined value in a state where a compression unit of the refrigerant circuit is stopped to suppress occurrence of pressure abnormality inside the gas-liquid separator in a state where a compressor is stopped.

Heat source unit and refrigeration apparatus

A heat source controller performs a first operation when a compression element is in a stopped state and a pressure in a receiver exceeds a predetermined first pressure. The heat source controller allows an inlet of the compression element to communicate with the receiver, and drives the compression element in the first operation.

A flow path switching mechanism () includes first to fourth flow paths () and opening and closing mechanisms (V, V, V, V) that can each open and close a corresponding one of the flow paths (). A first connection point (C) connecting an inflow portion of the first flow path () and an inflow portion of the second flow path () is connected to a discharge portion of a compression unit (). A second connection point (C) connecting an outflow portion of the first flow path () and an inflow portion of the third flow path () is connected to a gas-side end of a heat source heat exchanger (). A third connection point (C) connecting an outflow portion of the second flow path () and an inflow portion of the fourth flow path () is connected to a gas-side end of a second utilization heat exchanger (). A fourth connection point (C) connecting an outflow portion of the third flow path () and an outflow portion of the fourth flow path (), and a gas-side end of a first utilization heat exchanger () are connected to a suction portion of the compression unit ().

Refrigeration device

A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, an oil return pipe that returns the oil discharged by the high-stage compressor to the low-stage compressor, and an oil discharge pipe that discharges the oil in the low-stage compressor. The low-stage compressor includes a compression part that compresses the refrigerant, a motor that drives the compression part, and a container that houses the compression part and the motor. The container forms a high-pressure space storing compressed refrigerant. Inside of the oil return pipe and inside of the oil discharge pipe are connected to the high-pressure space.

Multistage compression system

A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, refrigerant pipes that introduce the refrigerant compressed and discharged by the low-stage compressor into a suction part of the high-stage compressor, an intercooler, and an oil discharge pipe. The intercooler cools the refrigerant discharged by the low-stage compressor before the refrigerant is sucked into the high-stage compressor. The intercooler is disposed between the refrigerant pipes. The oil discharge pipe discharges the oil in the low-stage compressor. The oil discharge pipe connects the low-stage compressor and a portion of the refrigerant pipes. The portion of the refrigerant pipes is on an upstream side of the intercooler.

An outdoor unit for an air conditioner includes: a casing including a bottom plate that defines a bottom surface of the casing; a heat exchanger disposed in the casing; and an installation foot that supports the bottom plate from below. The installation foot includes: a support portion that supports from below an end portion of the bottom plate, a wall portion disposed on an outer side of the end portion of the bottom plate and that extends upward from the support portion, and a mount portion that extends from an upper end of the wall portion. The heat exchanger is mounted on the mount portion. The mount portion has a hole that extends through the mount portion in a height direction of the outdoor unit.

Outdoor unit for air conditioner

A bottom frame () which constitutes a bottom surface of a casing () is divided into a main bottom frame () where a first compressor () is to be provided and a sub bottom frame () where a second compressor () is to be provided. The main bottom frame () is further divided into a first bottom frame () and a second bottom frame (). The first compressor () is to be provided on the first bottom frame (). A refrigerant circuit component () to be replaced or added in accordance with a capability or a function is to be provided on the second bottom frame ().

Growing community of inventors

Osaka, Japan

Takuya Horita