Hitachi, Ltd.

Hiroshi Iwata

Masahiro Takebayashi

Hiroaki Hata

Tadashi Iizuka

Reishi Naka

Kazuhiro Endoh

Makoto Tanaka

Katsumi Fukuda

Yoshiharu Homma

Koji Nariyoshi

Hirokatsu Kousokabe

Akio Sakazume

Kenji Tojo

Shigeru Machida

Hirokatsu Kohsokabe

Masahiko Sugiyama

Hiroaki Matsushima

Kazuo Sekigami

Kazuya Matsuo

Yasuhiro Oshima

Shigetaro Tagawa

Kazutaka Suefuji

Isamu Tsubono

Nobuo Abe

Hiroo Nakamura

Kazuo Ikeda

Susumu Kashiwazaki

Hirokatu Kousokabe

Yoshihisa Uneyama

Mitsuru Murata

Seiji Ohtake

Hiroyuki Ogawa

Saneaki Nakao

A refrigerating apparatus comprising a refrigeration cycle comprising at least a compressor, a condenser, a dryer, an expansion mechanism and an evaporator, a refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40&deg; C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages

Refrigeration cycle

A refrigerating apparatus comprising a refrigeration cycle comprising at least a compressor, a condenser, a dryer, an expansion mechanism and an evaporator, a refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR1## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.

A refrigerant compressor using a refrigerant composed mainly of a fluorocarbon and/or hydrofluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR1## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt. The winding wire of the stator of the compressor has a core wire having an enamel coating having a glass transition temperature of 120.degree. C. or higher.

Refrigerant compressor

In a refrigerator, an intermediate heat exchanger as an evaporator in the refrigeration cycle 11 in which a flammable refrigerant is sealed is provided inside of a heat insulating material. A heat transferring device is provided between the intermediate heat exchanger and a heat exchanger for cooling. At the time of stop and occurrence of the refrigerant leakage, the refrigerant inside of the intermediate heat exchanger is recovered into the condenser or into the refrigerant recovery cylinder so that even if the refrigerant leaks out, a leaked amount of the refrigerant into the refrigerator is reduced.

Refrigerator and condenser

A regrigerating apparatus comprising a refrigeration cycle comprising at least a compressor, a condenser, a dryer, an expansion mechanism and an evaporator, a refrigerant composed mainly of a fluorocarbon type refrigerant containing no chlorine and having a critical temperature of 40.degree. C. or higher, and a refrigerating machine oil comprising as base oil an ester oil of one or more fatty acids which contains at least two ester linkages ##STR1## in the molecule and has a viscosity at 40.degree. C. of 2 to 70 cSt and a viscosity at 100.degree. C. of 1 to 9 cSt.

Refrigerating apparatus and refrigerant compressor

A scroll fluid machine in which, even if volute bodies on the orbiting side and on the fixed side are different in material from each other, the volute bodies can be brought to their respective strengths equal to each other, dimension can be miniaturized or reduced, and internal leakage is reduced so that an attempt can be made to improve performance. In the scroll fluid machine, a curve of either one of an orbiting outward curve and a orbiting inward curve of a volute body on the orbiting side is formed by an algebraic spiral expressed by the following equation in the form of polar coordinates r=a.multidot..theta..sup.k (here, r: radius vector, .theta.: angle of deviation, a: coefficient, k: exponent). This curve and any one of a fixed outward curve and a fixed inward curve of the volute body on the fixed side are arranged with a phase difference of about 180 degrees. Thicknesses of respective volute walls on the orbiting side and on the fixed side are adequately or suitably changed.

Scroll fluid machine, scroll member and processing method thereof

A scroll fluid machine in which, even if volute bodies on the orbiting side and on the fixed side are different in material from each other, the volute bodies can be brought to their respective strengths equal to each other, dimension can be miniaturized or reduced, and internal leakage is reduced so that an attempt can be made to improve performance. In the scroll fluid machine, a curve of either one of a orbiting outward curve and a orbiting inward curve of a volute body on the orbiting side is formed by an algebraic spiral expressed by the following equation in the form of polar coordinates r=a.multidot..theta..sup.k (here, r: radius vector, .theta.: angle of deviation, a: coefficient, k: exponent). This curve and any one of a fixed outward curve and a fixed inward curve of the volute body on the fixed side are arranged with a phase difference of about 180 degrees. Thicknesses of respective volute walls on the orbiting side and on the fixed side are adequately or suitably changed.

A synchronous rotating type scroll fluid machine has a first scroll member driven by a shaft of a first motor and having an end plate and a scroll wrap protruding from a surface of the scroll end plate, and a second scroll member driven by a shaft of a second motor and having a scroll end plate and a scroll wrap protruding from a surface of the scroll end plate. The machine further has a mounting structure for mounting the scroll members such that the axes of the scroll members are offset from each other and that said scroll wraps of the scroll members mesh with each other. Thrust balancing arrangements are provided for attaining a balance between the thrusting forces acting on each said scroll member, both at the mounting structure and said scroll members. The thrust balancing arrangement includes through-bores formed in the respective motor shafts and serving as passage bores for discharging a compressed gas. This arrangement also provides cooling effect as the compressed working gas functions as a cooling medium and, in addition, serves to suppress distortion of the scroll end plate of each scroll member.

Synchronous rotating type scroll fluid machine

A scroll compressor has an orbiting scroll which operatively meshes with a stationary scroll to define compression chambers therebetween. This orbiting scroll is driven by an electric motor through a crank-shaft, and makes an orbiting movement while being prevented from rotating about its own axis by a rotation preventing member. The crankshaft is journalled by at least two sliding bearings which are arranged respectively on the both sides of the electric motor, and the mast remotely distanced bearing from the orbiting scroll has a self-aligning function which enables it to change its attitude in accordance with any inclination of the crankshaft. Further, a balance and a counter weight are provided on the crankshaft to counterbalance the centrifugal force produced by the orbiting scroll and the inertial force produced by the rotation preventing member.

Scroll compressor with improved bearing

A rotary compressor of the invention comprises an oil separating portion and an oil collecting portion located adjacent one end of a rotary shaft closely to a motor. An oil is separated through the oil separating portion and collected in the oil collecting portion in which the one end of the rotary shaft is submerged to lubricate a third bearing. The oil separating portion serves to separate oil mist which flows with gas flow. The one end of the rotary shaft is submerged in the oil as collected in the oil collecting portion under the influence of gravity to lubricate the bearing. This arrangement provides stable lubrication of the one end of the rotary shaft. The bearing is, thus, highly reliable while the rotary compressor is running at any speeds. Also, vibrations of the shaft can substantially be reduced particularly when the rotary compressor runs at a high speed.

Rotary compressor

A horizontal compressor including an electric motor and a compressor element mounted in a case serving concurrently as an oil sump. The compressor element includes a cylinder, a shaft having a crank, a roller fitted to the crank for eccentric rotation along inner side surfaces of the cylinder, a vane moving in reciprocatory movement in a bore of the cylinder while abutting against the roller, two side plates located on opposite sides of the cylinder, one of the two side plates being formed with a suction port for a lubricant and the other side plate being formed with a discharge port for the lubricant, and a pump chamber defined by a back of the vane, the bore of the cylinder and the two side plates. The suction port is in the form of a tapering port including a small diameter portion directly adjacent the pump chamber and a large diameter portion directly adjacent the case; the discharge port is in the form of a tapering port including a small diameter portion directly adjacent the lubricant feed passage and a large diameter portion directly adjacent the pump chamber; and a space is provided at least to the suction port in a position in which the space is in communication with the small diameter portion of the suction port.

Rotary compressor with tapered valve ports for lubricating pump

A horizontal type rotary compressor including a compression element having a cylinder, a shaft having a crank thereon, a pair of side plates concurrently serving both as bearings of the shaft and as side walls of the cylinder, a roller fitted onto the crank, and a vane so arranged as to slide in a groove of the cylinder and have a tip end thereof contacted with the roller rotating in accordance with the rotation of the crank and an appropriate end thereof urged by a spring to make a reciprocating movement along the groove are provided within a case. A pumping chamber is defined by a rear face of the vane, the groove of the cylinder and the side plates. One of the side plates is formed with a suction port capable of sucking thereinto the oil within the case while the other of the side plate is formed with a discharge port for transmitting the oil in the pumping chamber to an oil feeding passage. An oil feeder means for use in the horizontal type rotary compressor is a space provided at the exit of the suction port of the side plate having the suction port and the suction port opens downwardly so that the feeding of a sufficient or stable amount of oil is ensured even when the surface level of the oil is lowered.

Oil feeder means for use in a horizontal type rotary compressor

A room air conditioner in which the interior of a cabinet is divided into an indoor portion and an outdoor portion by a partition plate having a non-vertical section, and a fan motor is supported in the outdoor portion in such a manner that its rotary shaft is disposed perpendicular to the bottom of the cabinet and penetrates the partition plate at one end thereof to extend into the indoor portion. A first centrifugal fan is mounted at one end of the rotary shaft of the fan motor while a second Silocco fan is mounted at the other end thereof disposed in the outdoor portion. An indoor heat exchanger is disposed in spaced juxtaposed relation to a suction opening formed in the front of the indoor portion so that the air inside a room is drawn by suction through the indoor suction opening and caused to pass through the indoor heat exchanger by means of the first Silocco fan which exhausts air into the room through an indoor exhaust port, and an outdoor heat exchanger is disposed in spaced juxtaposed relation to a suction opening formed in the rear of the outdoor portion so that the air outside the room is drawn by suction through the outdoor suction opening and caused to pass through the outdoor heat exchanger by means of the second centrifugal fan which exhausts air outside the room through an outdour exhaust port. The room air conditioner has a greatly reduced thickness as compared with the same type of air conditioners of the prior art.

Growing community of inventors

Odawara, Japan

Hiroshi Iwata