Matsushita Electric Industrial Co., Ltd.

Hiromasa Ashitani

Masao Nakano

Takashi Morimoto

Kiyoshi Sawai

Shuichi Yamamoto

Sadayuki Yamada

Shozo Hase

Hiroyuki Fukuhara

Kiyoshi Sano

Katsuharu Fujio

Masafumi Fukushima

Taisei Kohayakawa

Taise Kohayakawa

Akira Ikeda

Syozo Hase

A refrigerant pump includes a thin-walled hermetic vessel and a thick-walled hermetic vessel having an end inserted into and secured to an end of the thin-walled hermetic vessel. A stator of an electric motor unit is fitted outside the thin-walled hermetic vessel, while a rotor of the electric motor unit is accommodated inside the thin-walled hermetic vessel. A pump mechanism is fitted inside the thick-walled hermetic vessel, and a rotational force of the rotor is transmitted to the pump mechanism by the drive shaft.

Refrigerant pump with rotors in bearing

A semiconductor cooling device includes a cold plate for cooling a semiconductor element, a condenser, and an inverter-controlled refrigerant pump, all of which are fluid connected in series with each other to define a refrigerating cycle. The semiconductor cooling device also includes a fan for cooling the condenser, a temperature detector disposed in proximity to the semiconductor element, and a controller for controlling the refrigerant pump and the fan. The controller controls the number of revolutions of the refrigerant pump and that of the fan depending on a value measured by the temperature detector.

Semiconductor cooling device

A semiconductor cooling device includes at least one cold plate for cooling a semiconductor element, a condenser adapted to be cooled by a fan, and a refrigerant pump. The refrigerant pump is electrically connected to an inverter controller that controls the number of revolutions of the refrigerant pump.

Semiconductor cooling device and method of controlling same

A cooling device for cooling a semiconductor element includes at least one cold plate utilizing a copper plate for cooling a semiconductor element, a condenser utilizing a plurality of flat micro-tubes, a refrigerant pump for circulating a refrigerant, and a fan for cooling the condenser. The cold plate, the condenser, and the refrigerant pump are fluid connected to define a refrigerant circulating circuit.

Cooling device for semiconductor elements

It is an object of the present invention to improve the efficiency of a scroll gas compressor by operating a bypass at a proper compression ratio. To achieve the object, the present invention is constituted so that at least one pair of bypass holes whose one ends are opened in a compression chamber currently performing compression nearby a discharge vent and whose other ends communicate with a discharge chamber are asymmetrically arranged on a panel board. This structure makes it possible to improve the efficiency of the compressor by operating the bypass at an optimum compression ratio even if a difference is observed between pressure rises of a pair of symmetric compressed spaces under the compression process.

Scroll gas compressor having asymmetric bypass holes

Base wraps 21a and 31a of a fixed scroll 20 and orbiting scroll 30 both have spiral lengths that satisfy specified compression ratio in low speed drive region. Spiral shaped extension wraps 21b and 31b are provided for at least one of the base wraps 21a and 31a, extended from the spiral end position thereof, and a displacement is effected in the direction in which the thickness of the wraps 21 and 31 becomes thinner, at least at either the inner walls of the extension wraps 21b and 31b or at the outer walls of the wraps 21 and 31 in opposition thereto, making the interrelationship greater.

Scroll compressor

A scroll compressor has a check valve assembly for selectively opening and closing a discharge port and allowing a fluid to flow only from the discharge port towards a discharge chamber. A stationary end plate mounted in the scroll compressor has a plurality of bypass holes defined therein at locations symmetrical in terms of pressure. The plurality of bypass holes are open to compression chambers closest to the discharge port and communicate with the discharge chamber. The stationary end plate also has at least one bypass valve for selectively opening and closing the bypass holes and allowing the fluid to flow only from the compression chambers towards the discharge chamber through the bypass holes. The bypass holes are serviceable to prevent an excessive compression and are positioned so as not to be closed by an orbiting scroll wrap immediately after the compression chambers closest to the discharge port have communicated with the discharge port.

Growing community of inventors

Otsu, Japan

Hiromasa Ashitani