Kabushiki Kaisha Maekawa Seisakusho

Mayekawa Mfg. Co., Ltd.

The Tokyo Electric Power Company, Incorporated

Japan Energy Corporation

Asahi Denka Kogyo K.k.

Mayekawa Manufacturing Co., Ltd.

Kabushiki Kaisha Naekawa Seisakusho

Japan Energy Corporation & Mayekawa Manufacturing Co. Ltd.

Keisuke Kasahara

Kuniaki Kawamura

Takashi Kaimai

Hisashi Yano

Akira Matsui

Takayuki Kishi

Shigenao Maruyama

Fujio Komatsu

Toshio Nishio

Masaya Ishikawa

Kunio Sugiyama

Toshio Aihara

Takayuki Kisi

Syoichi Kuroda

Soichiro Shibata

Shigetake Kawasaki

Nonyuki Shimamura

Seiichi Sakuma

Mitsuo Mashimo

Yuzuru Shindo

Sachio Hamaoka

Youichi Katori

Takaharu Mizuno

Ammonia refrigerating machine, working fluid composition and method

The present invention provides a working fluid composition for a refrigerating machine obtained by mixing an ammonia refrigerant with a lubricating oil which is extremely excellent in solubility with the ammonia refrigerant. The working fluid composition comprises a mixture of ammonia and one or more kinds of polyether compounds; the refrigerating machine is characterized by constituting a refrigerating cycle or a heat pump cycle through which the working fluid composition is circulated.

Working fluid composition and method for lubricating ammonia

A screw rotor for fluid handling devices configured to reduce the area of blowholes virtually without relationship to the length of the sealing line by selecting specific profile shapes of the addendum of the female rotor and the dedendum on male rotor. Further, the screw rotor configuration eliminates semi-occluded pockets forming between the addendum of the female rotor and the dedendum of the male rotor.

Screw rotor for fluid handling devices

A screw compressor has a male rotor and female rotor rotatably engaging each other in a casing. The male rotor has a radius R and Z-number of helical convex teeth, each of which is chamfered on a leading edge of an end facing the discharge end of casing to allow lubricating liquid to escape from a space between rotor teeth during discharge stages of operation. This prevents drastic increases in pressure upon the bearings due to a liquid compression phenomenon. Thrust forces produced by the liquid against a flat chamfer surface prevent scoring of the edges of the rotors and thus permit designs with narrow gaps between the rotors and the casing to improve the efficiency of the compressor.

Liquid injection type screw compressor with lubricant relief chamber

A latent heat storage apparatus is provided and a latent heat storage solution therefor stores and retrieves a cool heat substantially in or from a latent heat thereof necessary for air conditioning, cooling, refrigerating, and so forth. The latent heat storage apparatus has an aqueous solution of a plurality of inorganic salts as a latent heat storage solution in a heat storage tank, formed to retrieve a cold heat from a stored latent heat, the latent heat storage apparatus. The latent heat storage solution is formed of (N-1) kinds of inorganic salts in at least an N-component aqueous solution where N.gtoreq.3. The latent heat storage solution stores the cold heat as the latent heat thereof. The cold heat is retrievable from the stored latent heat at a desired temperature almost invariably within a range higher than the N-component eutectic point and lower than any one of binary eutectic points of salts with water. The concentration of each inorganic salt in the aqueous solution is represented in a tortuous eutectic plane including ice point of the N-component equilibria diagram, wherein the concentration range allows the cold heat to be retrieved at the specified temperature almost invariably from the latent heat of ice, binary eutectics with water and inorganic salts, or separated substances.

Latent heat storage apparatus and latent heat storage solution therefor

A jet stream injection device for use in a heat exchanger of a fluidized-bed type in which a flat jet stream is injected toward a heat transmission coil of the heat exchanger from below this coil so that is runs along said cell so as to form a mixed-phase flow of a gas and solid particles around the heat transmission coil. The jet stream injection device has a net with meshes smaller than the size of the particles of a fluidized bed provided over an opening provided on the upstream side of a jet stream generating slit-shaped injection port element. The opening has a larger passage sectional area than the injection port element.

Jet stream injection system

A refrigerating apparatus for refrigerating an object comprising a cooler and a transfer belt for transferring said object on said cooler, said cooler being contacted with said transfer belt directly or through a slidable layer or powder. Said slidable layer or powder consists of a heat-conducting and slidable substance.

Refrigerating apparatus

A refrigerating apparatus comprising a refrigerating cycle into which a screw compressor is incorporated, and a liquid super cooler connected on the way of a liquid pipe of said refrigerating cycle, said screw compressor having a gas intake and/or liquid coolant injection opening which is located at a position where the screw blades of the screw compressor have at least partially compressed the gas in the screw compressor. The position of the gas intake provided in the screw compressor and intended to pass the gas from the liquid super cooler into the screw compressor is limited under such a condition that

A method of prevention of overheating of an electric motor for a compressor comprising the steps of introducing into the case of the electric motor of the closed type for driving the screw compressor part of the refrigerant which is introduced into an evaporator so as to cause said part of the refrigerant to expand directly therein, and permitting the expanded gas which has absorbed heat to be drawn by suction into a screw blade groove space of the screw compressor in a position in which the screw blades of the screw compressor is meshing engagement with one another have sealed gas.

Method of and apparatus for preventing overheating of electrical motors

Growing community of inventors

Tokyo, Japan

Keisuke Kasahara