Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Tetuzou Ukai

Kimiharu Takeda

Masumi Sekita

Kazuhiro Sato

Makoto Takeuchi

Kazuhide Watanabe

Katsuhiro Fujita

Takayuki Kuwahara

Tomohisa Moro

Masahiro Ohta

Hirohumi Hirata

Kazuhiro Suzuki

In a scroll compressor configured to be capable of three-dimensional compression in a circumferential direction and a height direction of spiral wraps, in which top surfaces and bottom surfaces of spiral wraps (B andB) are provided with step portions (E andE) and the wrap height on the outer peripheral side of the step portion is made higher than the wrap height on the inner peripheral side, back-pressure introducing portions (and) where gaps between the back surfaces at step-portion ends of tip seals and groove bottom surfaces of tip seal grooves are made larger than a gap at the other portion are formed between the step-portion ends of tip seals (and) provided on top surfaces (G andG) on the outer peripheral side of the spiral wraps and tip seal grooves (L andL) to which the tip seals are fitted.

Scroll compressor for preventing performance deterioration and variation due to gas leakage

A scroll type compressor includes a check valve (42) having a valve element (63) disposed in a valve chamber (36, 60) and moveable in the vertical direction. A back pressure port (60a) having one end opening at a retainer surface (62a) and the other end communicating with a high-pressure side chamber (3, 43) is disposed in a retainer having the retainer surface thereon which is engaged by the valve element (63) when the check valve is in the open position.

Scroll type compressor having a discharge valve retainer with a back

In a scroll type machine, such as a scroll compressor, the difference in level between the axial end surface of a wear-resistant plate (40) installed at the periphery of the end plate (17) of an orbiting scroll (16) and the axial end surface of the end plate (17) is set within 0.+-.10 .mu.m. This difference in level (.delta.) is set to this range to prevent wear of the wear-resistant plate and the end plate of the orbiting scroll and to prevent deterioration in the performance of the scroll-type compressor so that a scroll-type compressor with high performance and high reliability can be realized.

Scroll-type fluid machine having a wear-resistant plate

A scroll-type fluid machine in which the high-pressure chamber side (36) of a back pressure chamber (6a) using a fixed scroll (11) made of an aluminum base material can be fully sealed. The fixed scroll (11) is made of an aluminum base material, and a discharge cover (2) is made of a ferrous material. Between the U seals (35) interposed between the high-pressure chamber (36) side of the back pressure chamber (6a) and the low-pressure side, at least the U seal (35a) on the high-pressure chamber (36) side is made of glass-reinforced polytetrafluoroethylene resin, and is installed so as to be pressed against the fixed scroll (11). The U seal withstands a high temperature and large pressure difference and is installed so that the sliding mating part of the U seal (35a) is not the fixed scroll (11) made of an aluminum base material which is easily worn, but the discharge cover (2) made of a ferrous material which is less prone to wear.

Scroll-type fluid machine having a sealed back pressure chamber

A refrigerating cycle machine characterized by comprising hardware or software means for raising the speed of rotation of the compressor or stopping the fan for producing an air current through the condenser when the operation of the machine is turned off and stopping the operation of the machine when a predetermined time has elapsed. This increases the suction and discharge pressure difference to such an extent that generates a sufficiently high pressure difference between both sides of the valve body to move the valve body toward the closing position surpassing the sticking force when the machine stops.

Refrigerating cycle machine

An oil pump for a closed type compressor of the present invention is mounted in the inside bottom of a closed housing. In the oil pump, a rotor is driven to revolve by an eccentric shaft formed at the lower end of a rotary shaft for driving a compressing mechanism while the rotor is formed with a projection which is inserted into a slot of a cylinder chamber in order to inhibit the rotation of the rotor. In this arrangement, the root of the projection is cut away so that the projection is prevented from interfering with angled portions of an opening of the slot.

Oil pump for a closed type compressor

The present invention relates to a horizontal hermetic compressor comprising an oil reservoir 9 which is installed in a closed housing to store the lubricating oil discharged from an oil pump 51, and an oil supply pipe which connects an oil supply hole 52 to the oil reservoir 9. The opening of an oil suction pipe 56 of the oil pump 51 is positioned below the upper limit oil level height H.sub.1 of the lubricating oil 57 stored at the inner bottom of the closed housing 8.

Growing community of inventors

Aichi, Japan

Tetuzou Ukai