Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Teijin Pharma Limited

Asahi Glass Company, Limited

Mitsubishi Electronic Corporation

Agc Inc.

Mitsubishi Denki K.k.

Hiroaki Makino

Shingo Hamada

Kosuke Tanaka

Koji Yamashita

Takahiro Yamaguchi

Takashi Kobayashi

Takashi Ikeda

Yasuhiro Suzuki

Hiroshi Yoshikawa

Seiji Hirakawa

Yoshihiro Sumida

Tadashi Saito

Minoru Imai

Satoshi Sugiura

Takahide Tadokoro

Wataru Yamada

Hideaki Maeyama

Hidetomo Nakagawa

Gen Unoki

Yuki Ugajin

Naoya Matsunaga

Hajime Ikeda

Kenichiro Kataoka

Yoshihiro Tanabe

Tetsuya Tazawa

Yoshiyuki Matsumoto

Hiroki Murakami

Hiroshi Omura

Yusuke Tashiro

Seiji Nakashima

Yusuke Adachi

Yusuke Hagiwara

Mitsuhiro Shirota

Yosuke Kikuchi

Koji Sachimoto

Hidenori Ishioka

Yoshinori Shirafuji

Kazuaki Isono

Tadashi Ariyama

Yasuhide Hayamaru

Kenta Kawahara

Dale Mitchell

Katsuyuki Amano

Kazuhide Yamamoto

Komei Nakajima

Takahiro Shishido

Tomomi Kosugi

Mika Takakuwa

Yuko Yamakoshi

Katsumi Shibayama

Katsuhiro Tozuka

Kouji Yamaguchi

Satoshi Hirakuni

Atushi Mochiduki

Hirotaka Ishida

Yasuo Imaki

Akinori Sakabe

Masazumi Chisaki

Kazuya Kubo

Noriko Semii

Takeshi Izawa

Yasushi Akahori

Atsushi Morita

Shigeki Onishi

Jiro Nakasu

Ryosuke Matsui

Joelle Le

Hironori Nagai

Takuya Kodama

Naotaka Suzuki

Donald James Simpson

Yasuhiro Oue

John Clifford Harris

Yohei Matsueda

Motoko Hamada

Shigeki Oonishi

Yusuke Tsuboi

Hajime Hiraoka

Takashi Kitazumi

Tatsuya Yokogi

Clifford John Harris

Aiko Fujino

Robert Dale Mitchell

James Donald Simpson

Minoru Ishii

In an air conditioning apparatus, heat exchange is conducted between refrigerant passing through a first high-temperature-side flow path and refrigerant passing through a first low-temperature-side flow path of a cooler, and between refrigerant passing through a second high-temperature-side flow path and refrigerant passing through a second low-temperature-side flow path of the cooler. A switching device switches between first/second refrigerant circuits. In the first circuit, an inlet of the first high-temperature-side flow path is formed downstream of the first low-temperature-side flow path with respect to an outlet of the first high-temperature-side flow path, and in the second refrigerant circuit, an inlet of the second high-temperature-side flow path is formed downstream of the second low-temperature-side flow path with respect to an outlet of the second high-temperature-side flow path.

Air conditioning apparatus and outdoor unit

In a refrigeration and air-conditioning apparatus, an inner diameter of an upward-flow pipe is defined as an inner pipe diameter, where a spherical droplet of refrigerating machine oil with a diameter equal to the inner pipe diameter is defined as a spherical refrigerating machine oil droplet, and where a force received by the spherical refrigerating machine oil droplet from refrigerant in liquid form flowing upward through the upward-flow pipe is defined as a fluid force, the refrigerant in liquid form flows upward through the upward-flow pipe at such a speed that the fluid force is greater than a gravitational force applied to the spherical refrigerating machine oil droplet.

Refrigeration and air-conditioning apparatus

A heat exchanger includes a plurality of fins and a plurality of tubes that are inserted into the fins and that allow refrigerant to flow in the tubes. The tubes include first heat transfer tubes and second heat transfer tubes. Each of the first heat transfer tubes includes grooves formed in an inner surface of the first heat transfer tube, and has an inside diameter Da and a groove depth Ta. Each of the second heat transfer tubes has an inner surface smoothed, has an inside diameter Db, and is connected to an associated one of the first heat transfer tubes. Da−2×Ta≤Db is satisfied.

Heat exchanger and air conditioning apparatus

An air-conditioning apparatus includes a refrigerant circuit that is formed of an outdoor unit and an indoor unit connected through indoor/outdoor connection pipes. The outdoor unit includes a compressor, an outdoor heat exchanger, and an expansion valve. The indoor unit includes an indoor heat exchanger. Combustible refrigerant is used as refrigerant flowing through the refrigerant circuit. The outdoor unit includes a refrigerant filling-dedicated connection port to fill the refrigerant and an evacuation-dedicated connection port to evacuate the refrigerant inside the refrigerant circuit. The refrigerant filling-dedicated connection port is provided inside a machine chamber that accommodates the compressor and the expansion valve, and the evacuation-dedicated connection port is provided outside the machine chamber.

Air-conditioning apparatus

An outdoor unit includes a casing including an air passage, an outdoor fan disposed in the air passage, a compressor disposed in the casing, an outdoor heat exchanger disposed in the casing and including fins and a heat transfer tube connected to the fins, a control board disposed in the casing and including a control unit that controls the compressor, and a heat sink disposed in the air passage in the casing and being in contact with the control board. The heat transfer tube of the outdoor heat exchanger includes a first region in which gas refrigerant or two-phase gas-liquid refrigerant flows when the outdoor heat exchanger is used as a condenser and a second region that is located downstream of the first region in a refrigerant flow direction and in which single-phase liquid refrigerant flows.

Outdoor unit

A heat exchanger includes a plurality of plate-shaped fins disposed at intervals, and a plurality of heat transfer tubes disposed to be inserted into through holes of the fins in a direction perpendicular to the fins. In each of the fins, a starting hole is formed between adjacent through holes, and the starting hole serves as a start point of bending of the fins and has a vertex portion at a bending portion of each fin which is close to an edge thereof. In each of the fins, a cut is made to connect the other edge of the fin and a side of the starting hole which is located opposite to the vertex portion of the starting hole. The above each fin is bent at the vertex portion of the starting hole, by opening the cut from the starting hole.

Heat exchanger, refrigeration cycle apparatus, and method for manufacturing heat exchanger

In an axial flow fan according to the present invention, a plurality of blades rotate about a rotation axis of the blades to convey a fluid. In the axial flow fan, the plurality of blades each have a leading edge at a leading side in a rotational direction, a trailing edge at a trailing side in the rotational direction, and an outer peripheral edge connecting the leading edge and the trailing edge. The leading edge of one of the plurality of blades and the trailing edge of another blade adjacent to the leading edge of the blade in the rotational direction are connected by a plate-shaped connection portion. The plurality of blades each have at least one plate-shaped reinforcement rib extending from a periphery of the rotation axis toward the outer peripheral edge of the blade.

Axial flow fan and air-conditioning apparatus having axial flow fan

In an indoor unit of an air-conditioning apparatus, an air inlet for room air is provided at a position lower than a height position of a drain pan. A partition plate is provided to partition a space below a height position of the drain pan in a housing. A pipe connecting portion connected to a refrigerant pipe of an outdoor unit is provided in one part of the partitioned space and a heat exchanger and a fan are placed in the other part of the partitioned space. At least one communicating path is formed in the partition plate to communicate the two parts of the partitioned space with each other. The indoor unit can include a controller for activating a fan when leakage of refrigerant is detected or for closing the communicating path when leakage of refrigerant is detected.

Indoor unit of air-conditioning apparatus having leaked refrigerant ventilation

Provided is an air-conditioning apparatus configured so that a decrease in a refrigeration capacity can be suppressed without increasing the amount of refrigerant with which a refrigerant circuit is filled and that refrigerant can be suitably stored during a pump down operation. The air-conditioning apparatus includes a first on-off valve provided at a pipe between an expansion valve and a use side heat exchanger, a bypass branching from a pipe between the expansion valve and the first on-off valve and connected to a pipe at a suction-side of a compressor, and a refrigerant storage unit configured to store the refrigerant having passed through the bypass. In a pump down operation in which the compressor operates with the first on-off valve being in a closed state, the refrigerant having flowed out from the heat source side heat exchanger flows into the bypass, and then, is stored in the refrigerant storage unit.

When a controller determines that a leakage of refrigerant occurs, the controller executes a control of rotating an air-sending fan at high rotation speed. After the control, the controller executes a control of stopping rotation of the air-sending fan or reducing a rotation speed of the air-sending fan in accordance with a result of detection by a first refrigerant sensor provided in a lower portion of a heat exchanger chamber. Thus, the air-sending fan is prevented from continuing the rotation at high rotation speed. Therefore, an indoor unit for an air-conditioning apparatus is excellent in safety and is capable of avoiding feeling of discomfort of a user due to the high-speed rotation of the air-sending fan.

Indoor unit for air-conditioning apparatus

An air-conditioning apparatus can suppress occurrence of disproportionation (an autolytic reaction) when HFO1123 refrigerant or a refrigerant mixture containing HFO1123 is applied. The air-conditioning apparatus includes a controller controlling at least one of an operation frequency of a compressor, an opening degree of an expansion valve, and an air amount of a fan sending air to a heat-source-side heat exchanger so that a temperature and a pressure of the refrigerant discharged from the compressor do not exceed threshold values.

An air-conditioning apparatus includes a time constant calculation unit that estimates a response time constant at a time when an opening degree of an expansion device is changed on the basis of specifications of a compressor that forms a refrigeration cycle of the air-conditioning apparatus, specifications of a load side heat exchanger, and an operating state quantity of the air-conditioning apparatus, a control constant calculation means that calculates at least one of a control gain of the opening degree of the expansion device and a control interval on the basis of a calculation result of the time constant calculation means, and a control constant change means that changes a control constant.

An apparatus includes a refrigerant circuit in which a compressor that compresses a refrigerant, an indoor-side heat exchanger serving as a radiator that exchanges heat between the refrigerant and a heating target, an expansion valve that decompresses the refrigerant by opening-degree adjustment, and an outdoor-side heat exchanger serving as an evaporator that exchanges heat between a heat-exchange target and the refrigerant are connected by pipes. The apparatus includes: an outdoor air temperature sensor that detects a temperature of outdoor air serving as the heat-exchange target; a discharge-side temperature sensor that detects a discharge temperature of the refrigerant discharged by the compressor; and a controller that, when the controller determines that a rotation speed of the compressor is a maximum and the temperature of the heat-exchange target is lower than a preset temperature, controls an opening degree of the expansion valve by using the discharge temperature.

Heat pump apparatus

Propeller fan

A pipe joint is connected with a connecting pipe, and includes a pipe joint body and a nut member. When the connecting pipe formed with a bead expanded in the radial direction is connected with this pipe joint, a male thread of the pipe joint body is engaged with a female thread of the nut member to hold the bead between a tapered face and a tapered face. In addition, the joined portion between the bead and the tapered face forms a first sealed portion, and a joined portion between the bead and the tapered face forms a second sealed portion. Still further, a tapered face of the pipe joint body is joined with the tapered face of the nut member to form a third sealed portion.

Pipe joint, air conditioner, method for producing connecting pipe, connecting pipe, and connection method

Growing community of inventors

Tokyo, Japan

Hiroaki Makino