Abstract: An oil-cooled screw compressor which can maintain the discharge temperature of discharge gas at an appropriate level is provided. The oil-cooled screw compressor comprises a compressor body, an oil separation/recovery unit disposed in a discharge path extending from a discharge port of the compressor body, and an oil feed path extending from the oil separation/recovery unit and communicating with the compressor body 12. The oil feed path is branched at an intermediate position thereof into a first feed path portion and a second feed path portion. An opening/closing valve is disposed in the first feed path portion, a pressure gauge is disposed in the discharge path, and a control unit is provided to control opening and closing of the opening/closing valve on the basis of a correlation between a discharge pressure detected by the pressure gauge and a predetermined pressure.

Abstract: A screw compressor 1 comprises a screw compressor body 2 having a pair of female and male screw rotors 21 meshed with each other encased in a rotor casing 22, and a motor casing 4 having a motor 3 for driving a male rotor 21b of the screw rotor 21 encased therein. The screw compressor body 2 and the motor casing 4 are connected integrally. The male rotor 21b and the motor 3 are connected by a common rotor shaft 23. In the common rotor shaft 23, the counter motor 3 side is supported by a rolling bearing and a projecting end of the motor 3 is supported by a rolling bearing 7 on the motor side, and a portion between the motor 3 and the screw rotor 21 is supported by an intermediate rolling bearing 6.

Abstract: To provide a gear pump for carrying high viscous liquid, which keeps a bearing in a free state and enhances reliability relative to a leakage of cooling medium and a leakage of molten resins. The gear pump in which a pair of gear rotors 2 are supported on a body 1 of the gear pump through a bearing 6, a cover for preventing the bearing 6 from being slipped out is secured to the body 1, and a temperature adjusting medium passage 20 is formed in the bearing 6, wherein an inlet pipe 28 and an outlet pipe 29 to the temperature adjusting medium passage 20 are connected to the axial outer end of the bearing 6, an intermediate plate 10 is interposed between the axial outer end of the bearing 6 and the cover 11, the intermediate plate 10 being provided with an insert hole 31 for the inlet pipe 28 and the outlet pipe 29, the cover 11 being provided with a guide portion 32 having the inlet pipe 28 and the outlet pipe 29 loosely fitted therein to guide them to outside.

Abstract: To provide an oil-cooled type compressor in which the percentage content of oil of compressed gas delivered to an oil supply destination is always monitored to thereby enable prevention of an abnormal increase of the percentage content of oil.

Abstract: To provide a gear pump for carrying high viscous liquid, which keeps a bearing in a free state and enhances reliability relative to a leakage of cooling medium and a leakage of molten resins.

Abstract: A screw compressor 1 comprises a screw compressor body 2 having a pair of female and male screw rotors 21 meshed with each other encased in a rotor casing 22, and a motor casing 4 having a motor 3 for driving a male rotor 21b of the screw rotor 21 encased therein. The screw compressor body 2 and the motor casing 4 are connected integrally. The male rotor 21b and the motor 3 are connected by a common rotor shaft 23. In the common rotor shaft 23, the counter motor 3 side is supported by a rolling bearing and a projecting end of the motor 3 is supported by a rolling bearing 7 on the motor side, and a portion between the motor 3 and the screw rotor 21 is supported by an intermediate rolling bearing 6.

Abstract: An extruder driving apparatus is provided in which a speed change gear mechanism is disposed in a position allowing the speed change gear mechanism to rotate at a much lower rotational speed, whereby a noise level is reduced and a seizing trouble is more surely avoided. The extruder driving apparatus comprises a main motor; a planetary gear mechanism including a torque input portion driven by the main motor and outputting a driving force after reducing a rotational speed of the main motor; an output distributing gear mechanism for distributing a driving force from an output portion of the planetary gear mechanism to a plurality of rotor drive shafts arranged parallel to each other; coupling units for connecting one ends of the rotor drive shafts to a plurality of rotors disposed on the extruder side; and thrust bearings for supporting the other ends of the rotor drive shafts to bear thrust forces imposed from the rotors.

Abstract: Radial cross sections of a male screw rotor and a female screw rotor at a contact portion therebetween for transmitting power from the female rotor to the male rotor are profiled in the shape of roulettes, for example, cycloids, generated by the rolling of rolling curves, for examples, circles, along pitch circles of the rotors.

Abstract: A silver-containing antimicrobial agent which is excellent in affinity to fiber, antimicrobial property, anti-fungus property and stability to heat and light. It comprises carboxymethyl cellulose containing silver in the amount of 0.01 to 1% by weight and having the degree of substitution to carboxymethyl group of not less than 0.4. The carboxymethyl cellulose may be a crosslinked compound to make the antimicrobial agent water resistant.

Abstract: An oil flooded screw compressor wherein a thrust force acting upon a bearing is controlled within a fixed range to prevent possible damage to the bearing. The oil-cooled screw compressor comprises a pair of meshing screw rotors, a balance piston mounted for axial movement in parallel to axes of the screw rotors for causing, when operated, a force to act upon one of the screw rotors in a direction from the sucking side to the discharging side, and a slide valve for adjusting the volume of the screw compressor. A flow path of pressure fluid is provided for operating the balance piston and and is controlled such that it is opened when the slide valve is positioned on the full load side with respect to a preset position, but is closed when the slide valve is positioned at any other position.

Abstract: A screw compressor comprises a pair of screw rotors provided in a casing, a cylinder fixed to the casing and having a first chamber and a second chamber, a first piston fitted in the first chamber, a second piston fitted in the second chamber, a built-in volume ratio adjusting valve operated by the first piston, a volume control slide valve operated by the second piston, a stopper fixed to the casing to limit the backward movement of the built-in volume ratio adjusting valve, and a volume control slide valve. When built-in volume ratio adjustment is unnecessary, the built-in volume ratio adjusting valve is held immovable between the stopper and a spacer fixed to the built-in volume ratio adjusting valve and resting on a fixed surface of the casing. All the forces acting on the immovable built-in volume ratio adjusting valve are sustained by the casing, so that the rest of the components of the screw compressor are not exposed to excessive forces.

Abstract: Described herein are a couple of female and male screw rotors suitable for use in an oil cooled compressor or the like, the female rotor having a tooth of a profile containing on the trailing side thereof a first tooth surface expressed by a function f(x), generated by a tip end portion located on the trailing side of the opposing male rotor tooth and expressed by an arbitrary function F(x), and a second tooth surface expressed by a function G(x) and extending from the first tooth surface of the function f(x) to the addendum circle of the female rotor tooth, the second tooth surface being profiled in a different shape from the first tooth portion f(x) and having the center of curvature in part thereof located outward of the addendum circle of the female rotor tooth on the anterior side thereof.

Abstract: Sialic acid derivative with active ester groups expressed with the formula [I] ##STR1## Where R.sup.1 denotes hydrogen or an acetyl group, R.sup.2 denotes hydrogen or a lower alkyl group, R.sup.3 denotes C.sub.2 H.sub.4, C.sub.3 H.sub.6 or C.sub.2 H.sub.2, R.sup.4 denotes an hydroxyl group, the residue left after removing hydrogen from the alcohol portion of the active ester or alkyloxycarbonyloxy group, AC denotes an acetyl group, Ph denotes an phenyl group, and X denotes oxygen or sulfur. This sialic acid derivative has high reactivity because it has active ester groups in the molecules and can be used as a raw material or intermediate for synthesis of various sialic acid derivatives.

Abstract: Sialocylglycerolipids represented by the following general formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom or a group CH.sub.3 CO--; R.sup.2 represents an alkali metal, a hydrogen atom or a lower alkyl group; R.sup.3 represents a hydrogen atom or a group C.sub.n H.sub.2n+1 -- (n is an integer ranging from 1 to 30); and R.sup.4 represents a group C.sub.m H.sub.2n+1 -- (m is an integer ranging from 1 to 30) are herein disclosed. They are prepared by treating a corresponding compound in an alkaline aqueous solvent. The method makes it possible to provide these compounds in a high yield by a simple processes.

Abstract: A radial load reducing device includes a high-pressure fluid chamber defined to face an outer circumferential portion of a rotating shaft or an outer circumferential portion of a rotating body integrally rotating with the rotating shaft at a first position where a radial load to be applied to the rotating shaft is directed, and a low-pressure fluid chamber defined to face the outer circumferential portion at a second position opposite to the first position. Further, a sliding bearing and a screw compressor using the above device are also provided. The fluid pressure in the high-pressure fluid chamber is applied in a direction counter to the direction of application of the radial load to be applied to the rotating shaft, thereby reducing the radial load to be applied to the rotating shaft.

Abstract: The present invention relates to sialic acid derivatives. According to the present invention, there is provided sialic acid derivatives having the general formula (I): ##STR1## wherein, R.sup.1 represents hydrogen, an acetyl group, a trityl group, ##STR2## (R.sup.5 represents hydrogen or an acetyl group and R.sup.6 represents hydrogen, sodium or a methyl group).R.sup.2 represents hydrogen or an acetyl group,one of R.sup.3 and R.sup.4 represents ##STR3## (R.sup.7 represents a hydrogen atom or an acetyl group, R.sup.8 represents a hydrogen atom, an acetyl group or a benzyl group, R.sup.9 represents a hydrogen atom, an acetyl group, a benzyl group or ##STR4## wherein R.sup.10 represents a hydrogen atom or a benzoyl group), while the other represents --COOR.sup.11 wherein R.sup.11 represents hydrogen, sodium, or a methyl group.

Abstract: A sialic acid-bonded octapeptide represented by the following general formula (I): ##STR1## wherein R represents a hydrogen atom or an acetyl group; and R' represents a lower alkyl group, an aralkyl group, a hydrogen atom or an alkali metal atom, is herein disclosed. The peptide chain of the sialic acid-bonded octapeptide is constituted by 8 amino acid molecules on the C-terminus side of FTS and the compounds represented by formula (I) can be obtained by bonding sialic acid to the amino terminus of the peptide chain according to condensation. These octapeptides show excellent physiological activity comparable to FTS and a half life in blood longer than that of FTS and it is expected that the affinity of the peptide to lymphocytes is also enhanced. Thus they can effectively be used as medicines for treating the lowering and abnormality of functions of the thymus.

Abstract: The present invention provides ganglioside-related compounds expressed by the following formula: ##STR1## (wherein R.sub.1 denotes a hydrogen atom or SiR.sub.3 R.sub.4 R.sub.5 (wherein R.sub.3 and R.sub.4 each denotes a methyl or phenyl group, and R.sub.5 denotes a tertiary butyl or dimethylphenylmethyl group), and R.sub.2 denotes a hydrogen atom, a trityl group, or ##STR2## (wherein M denotes an alkali metal atom)) and methods of producing the same. These ganglioside-related compounds are useful as markers for the early detection of cancer and in the immunotherapy for cancer.

Abstract: The present application discloses a new sialosyl glyceride having the following formula, which compound is useful as a remedy for nervous diseases, has an excellent compatability with the living bodies, and is easily producible. ##STR1## wherein R.sup.1 represents a hydrogen atom or XCH.sub.2 CO-- (X being a halogen atom), R.sup.2 represents an alkali metal, a hydrogen atom or a lower alkyl group, R.sup.3 represents a hydrogen atom or --CO(CH.sub.2)mCH.sub.3, R.sup.4 represents --CO(CH.sub.2)mCH.sub.3 amd m and n each represents a number of 0 to 30.

Abstract: A sialic acid derivative having an active carbonyl group represented by the formula [I]: ##STR1## wherein R.sup.1 represents hydrogen or acetyl group; R.sup.2 represents hydrogen, a metal or a lower alkyl group; R.sup.3 represents hydrogen, hydroxyl gorup, or a residue removed hydrogen from an alcohol portion of an active ester; Ac represents acetyl group; and n is 1 to 20, respectively. This sialic acid derivative [I] can be utilized as a starting material for various complex having a sialic acid in the molecule since it has an active carbonyl group in the molecules so that it shows high reactivity.