摘要:
The invention provides a method and an apparatus for plasma cutting which can produce a cut product having less dross, affixed thereto, and a clear cut surface, and which are capable of high-speed performance even at the time of the piercing operation. To this end, during the time of the piercing operation, an oxidative gas (O.sub.2) is used as the plasma gas, and at the time of the cutting operation a non-oxidative gas (N.sub.2) is used as the plasma gas to cut a workpiece (6). In addition, when shifting from the piercing operation to the cutting operation, the supplying of the non-oxidative gas (N.sub.2) can be started before the supplying of the oxidative gas (O.sub.2) is stopped.
摘要:
A first optical base having a high-reflection mirror and a second optical base having a partial-reflection mirror are arranged in parallel to each other on both sides of an oscillator housing. A guide light source emits a guide light for aligning optical components in an optical path of a laser light emitted from an optical resonator and adjusting a processing point on a target object. An optical-component supporting unit includes optical components that guide the laser light in a direction perpendicular to an optical axis of the optical resonator. The guide light source is arranged on the second optical base.
摘要:
A Stirling engine control apparatus includes a pressure reducing valve provided in a maximum cycle pressure line connecting a working space to a working gas compressor and a working gas tank via a first check valve, a pressure boost valve provided in a minimum cycle pressure line connecting the working space to the working gas storage tank via a second check valve, an operating lever pivotable about a movable fulcrum for controlling opening and closing of the pressure reducing valve and the pressure boost valve, a movable member on which the movable fulcrum of the operating lever is provided, and control means for positionally shifting the movable member upon comparing a target pressure corresponding to displacement of the operating lever and pressure within the minimum cycle pressure line.
摘要:
The amount of moisture discharged from within a fuel cell is increased by a simple construction. The fuel cell system includes a fuel cell for generating electrical power after causing an anode to receive a hydrogen-containing anode gas and causing a cathode to receive an oxygen-containing cathode gas; an exhaust gas valve provided downstream of the fuel cell in a gas circulation system that supplies an anode gas to the fuel cell; a regulator that is provided upstream of the fuel cell in the gas circulation system and raises gas pressure in the gas circulation system; and an ECU that opens the exhaust gas valve, with the gas pressure kept raised to a level higher than in normal times by use of the regulator. As a result of this, it is possible to increase the gas flow rate and flow velocity within the fuel cell, and it becomes possible to increase the discharge amount of moisture stagnating within the fuel cell.
摘要:
An oscillator housing includes a main body unit that is shaped into a frame and formed of a metallic material and a cover unit that is formed of a metallic material to cover openings of the main body unit, and has an outer wall that has an arc cross section perpendicular to the optical axis and extends in the optical axis direction and side walls that are connected to the both ends of the outer wall in the optical axis direction. When the cover unit is fixed to the main body unit with a fixing member, the outer wall having an arc shape is configured such that force is generated in the height direction towards the outside of the oscillator housing on the connecting portion of the cover unit with the main body unit.
摘要:
The amount of moisture discharged from within a fuel cell is increased by a simple construction. The fuel cell system includes a fuel cell for generating electrical power after causing an anode to receive a hydrogen-containing anode gas and causing a cathode to receive an oxygen-containing cathode gas; an exhaust gas valve provided downstream of the fuel cell in a gas circulation system that supplies an anode gas to the fuel cell; a regulator that is provided upstream of the fuel cell in the gas circulation system and raises gas pressure in the gas circulation system; and an ECU that opens the exhaust gas valve, with the gas pressure kept raised to a level higher than in normal times by use of the regulator. As a result of this, it is possible to increase the gas flow rate and flow velocity within the fuel cell, and it becomes possible to increase the discharge amount of moisture stagnating within the fuel cell.
摘要:
A Stirling engine control apparatus includes a pressure reducing valve provided in a maximum cycle pressure line connecting a working space to a working gas compressor via a first check valve, a pressure boost valve provided in a minimum cycle pressure line connecting the working space to the working gas compressor via a second check valve, an operating lever pivotable about a movable fulcrum for controlling opening and closing of the pressure reducing valve and the pressure boost valve, an electronic control circuit for driving a motor adapted to move the pivot point, and an unload valve provided in a line shorting intake and discharge sides of the compressor. The electronic control circuit is adapted to move the movable pivot point so as to control working gas pressure in accordance with a reference target pressure decided by engine rotating speed and amount of operating lever displacement in neutral and parking ranges, and in accordance with a practical target pressure obtained by adding a pressure increment to the reference target pressure in a drive range.
摘要:
A gas/liquid separation device is connected to a discharge valve which can discharge fuel gas to the outside of a fuel cell system along with water accumulated in the gas/liquid separation device. A change in pressure at a portion upstream of the discharge valve, which occurs due to an opening operation of the discharge valve, is detected or estimated, and an integral value is obtained by integrating the amount of change in the pressure with respect to time from when the discharge valve is opened or a parameter value corresponding to the integral value is obtained. The integral value represents an amount of fuel gas discharged due to the opening operation of the discharge valve. It is therefore possible to reliably discharge a desired amount of fuel gas by deciding a closing time at which the discharge valve is closed based on the integral value or the parameter value corresponding to the integral value.
摘要:
A laser beam machining head comprises a first machining head section having a flange in a first end part in a direction along an optical axis direction of laser light and having a laser light emission nozzle in a second end part, a second machining head section having an engaged part engaged with the above-mentioned flange of the first machining head section for detachably holding the above-mentioned first machining head section, and an O ring being engaged in an engagement part placed in an outer peripheral surface of the above-mentioned flange opposed to an inner peripheral surface of the above-mentioned engaged part and pressed against the inner peripheral surface of the above-mentioned engaged part, whereby when the first machining head section collides with an obstacle, a breakage prevention function reliably operates for preventing not only damage to the first machining head section, but also damage to the whole laser beam machining head, and in the normal state, the first machining head section is held and fixed reliably.
摘要:
A magnetostriction type stress detector including a passive member to which an external force is applied, which passive member is formed of a magnetic material; a magnetic shielding member provided around the passive member, which magnetic shielding member is formed with a plurality of slits; and a detection coil provided around the magnetic shielding member for detecting a change in magnetic permeability due to a stress in the passive member to be generated by the external force, through the slits of the magnetic shielding member.