摘要:
A reciprocating compressor, being small-sized and compact, for compressing hydrogen gas to be used in a fuel-cell car, has a crankshaft, to which an end of a connecting rod is connected. The other end of the connecting rod is connected to a crosshead. To the crosshead are connected a pair of shafts, each extending in directions opposing to each other. To each of the shafts is connected a plunger. The each plunger is received within a cylinder at the tip portion thereof. A pair of plungers moves reciprocally on an almost same axis, and the crosshead is formed in one body.
摘要:
A reciprocating compressor includes: a low-pressure stage compression part for compressing low-pressure working gas supplied from a supply source; two high-pressure stage compression parts for compressing the working gas compressed by the low-pressure stage compression part at two stages; and a crank mechanism for driving the low-pressure stage compression part and the high-pressure stage compression parts. The two high-pressure stage compression parts each have a plunger and a cylinder and are arranged on both sides of the crank mechanism in such a way as to extend coaxially opposite to each other. The low-pressure stage compression part has a piston and a cylinder and is located in the middle of the two high-pressure stage compression parts. The crank mechanism, the low-pressure stage compression part, and the two high-pressure stage compression parts are substantially located in the same plane.
摘要:
A magnetic bearing is provided with a simulating circuit for estimating a displacement of a rotor on the basis of a force which is exerted on the rotor. An output of the simulating circuit is compared with an actual displacement signal. A delay circuit and a subtracter are provided to subtract a run-out, which was estimated one period before the rotation of the rotor, from the displacement signal. A displacement signal from which the run-out component was eliminated is set to a new displacement signal. A signal which is obtained by adding an estimated run-out of one period before, namely, an output of the delay circuit to the run-out which was estimated by comparing the output of the simulating circuit with the new displacement signal is newly inputted to the delay circuit. Due to this, the run-out component is eliminated from the displacement signal of the magnetic bearing, the load on power amplifiers for driving the electromagnets is reduced, there is a surplus for a saturation which is caused in a high frequency band, the reliability of the control system is improved, and deterioration of positional accuracy due to the run-out is prevented.
摘要:
A controller of magnetic bearing controls the rotor speed with a reduced drive current while suppressing the rotor vibration. The controller implements the ABS control, N-cross control, N-straight control and FF control in proper combination in addition to the basic PID control. A computer in the controller determines the activation of each control in accordance with a predetermined table of control plan in response to the detected rotor speed.
摘要:
A balancing method for balancing a flexible rotor is disclosed. First, the rotor is rotated and vibration of the rotor is measured to determine resonance speeds. Vibration exciting forces of frequencies synchronized with the rotor rotation in two orthogonal directions are imparted to the rotor or rotor support bearings while rotating the rotor at a speed near the respective resonance speeds. The amplitude and the phase of the vibration exciting force which reduces the resonance vibration of the rotor are then determined. A correction weight on the basis of the amplitude and the phase of the vibration exciting force is then determined. Balancing work on the rotor such as grinding of the rotor or addition of a mass to the rotor in accordance with the correction weight is then carried out, followed by a rotor rotation conducted for the purpose of confirming the effect of the balancing work.
摘要:
Provided is a process for producing a silane coupling agent, which can shorten the time required for the production process. A process for producing a silane coupling agent, characterized by comprising a step of reacting a silane compound (A) with a compound (B) which has a hydroxyl group and further contains an atom having an unshared electron pair other than an oxygen atom derived from the hydroxyl group, in the presence of a metal-containing catalyst (m) to obtain a silane compound (C) which has an alkoxyl group containing the atom having the unshared electron pair other than the oxygen atom derived from the hydroxyl group.
摘要:
Dispersion of filler(s) in polymeric compositions are improved by the use of a polymer-filler coupling compound, Q—A—B, wherein Q comprises a dipolar nitrogen-containing moiety that can form a 1,3 dipolar addition to an unsaturated carbon-carbon bond; B is an oxazoline, thiazoline, alkoxysilane or allyltin moiety, and A is a linking atom or group that forms a bridge between Q and B.
摘要:
Provided is a process for producing a silane coupling agent, which can shorten the time required for the production process. A process for producing a silane coupling agent, characterized by comprising a step of reacting a silane compound (A) with a compound (B) which has a hydroxyl group and further contains an atom having an unshared electron pair other than an oxygen atom derived from the hydroxyl group, in the presence of a metal-containing catalyst (m) to obtain a silane compound (C) which has an alkoxyl group containing the atom having the unshared electron pair other than the oxygen atom derived from the hydroxyl group.
摘要:
An insulative block has a first face adapted to oppose a board on which an inspection circuit is arranged and a second face adapted to oppose a device to be inspected. The insulative block is formed with first through holes each of which communicates the first face and the second face. A conductive first plating layer is formed on the first face, the second face, and an inner face of at least one of the first through holes. Each of contact probes includes a conductive tubular body held in an associated one of the first through holes and a plunger which is retractably projected from one end of the tubular body and is adapted to come in contact with a terminal of the device.
摘要:
A rubber composition for a tire tread which comprises (A) a rubber component selected from the group consisting of natural rubber and synthetic diene-based rubbers, (B) 5 to 50 parts by weight per 100 parts by weight of the rubber component of (b1) aluminum hydroxide particles which are treated with a surface treating agent on the surface and have an average diameter of secondary particles D2 of 10 &mgr;m or smaller or (b2) aluminum hydroxide particles which have an average diameter of secondary particles D2 of 0.8 &mgr;m or smaller and a ratio (D2/D1) of the average diameter of secondary particles D2 to an average diameter of primary particles D1 of 1.7 or smaller and (C) 5 to 80 parts by weight per 100 parts by weight of the rubber component of at least one filler selected from carbon black and silica. The rubber composition is used for a tire tread and provides a tire which exhibits improved abrasion resistance while the excellent performance on wet roads and the low fuel consumption exhibited by a tire using a conventional rubber composition containing aluminum hydroxide are maintained.