Abstract: A hollow package (103) includes a substrate (109), an element (111), a partition wall (113), and a top plate (115) and has one or more closed hollow parts (117) that are covered by the substrate (109), the partition wall (113), and the top plate (115), and the substrate (109), the partition wall (113), and the top plate (115) are sealed with a cured product of a sealing resin composition. The top plate (115) and the partition wall (113) are composed of an organic material, and the thickness of the top plate (115), the thickness of the partition wall (113), the width of the partition wall, and the maximum width of the hollow part (117) are each within respective predetermined ranges. The sealing resin composition comprises (A) an epoxy resin that includes one or more selected from the group consisting of an epoxy resin containing two epoxy groups in the molecule and an epoxy resin containing three or more epoxy resins in the molecule and (B) an inorganic filler.

Abstract: A watch includes: a crown including a head portion and a shaft portion; a stem pipe including a first surface that includes an insertion hole through which the shaft portion is inserted and has a distance from a surface of the shaft portion as a first distance in cross-sectional view, and a second surface that is provided at a position closer to an end portion of the insertion hole than the first surface and has a distance from the surface of the shaft portion as a second distance larger than the first distance; a packing disposed between the surface of the shaft portion and the first surface; and a metal ring that is disposed between the surface of the shaft portion and the second surface and is in contact with the packing.

Abstract: A watch includes: a crown including a head portion and a shaft portion; a stem pipe including a first surface that includes an insertion hole through which the shaft portion is inserted and has a distance from a surface of the shaft portion as a first distance in cross-sectional view, and a second surface that is provided at a position closer to an end portion of the insertion hole than the first surface and has a distance from the surface of the shaft portion as a second distance larger than the first distance; a packing disposed between the surface of the shaft portion and the first surface; and a metal ring that is disposed between the surface of the shaft portion and the second surface and is in contact with the packing.

Abstract: A multistage dry vacuum pump includes a housing, pump chambers formed in the housing, each having an inlet and an outlet, a rotor provided in each pump chamber, a shaft connected to each rotor, a rotation driving device connected to the shaft, an intermediate exhaust conduit, one end thereof connected to the outlet of the pump chamber other than the most downstream and the other end thereof opened to outside, and a first fluid flow control device provided in the intermediate exhaust conduit for closing the same when fluid pressure in the outlet side of the pump chamber connected to the intermediate exhaust conduit is lower than that outside the other end of the intermediate exhaust conduit, and for opening the same when fluid pressure is equal to or higher than that outside the same.

Abstract: A multistage dry pump includes a pump housing having plural pump chambers aligned in parallel, a rotational shaft extending along a parallel alignment direction of the plural pump chambers and rotatably supported by the pump housing, and plural rotors parallelly aligned in an axial direction of the rotational shaft and furnished in the respective plural pump chambers. The rotational shaft is formed with a base material of which linear expansion coefficient is less than 6×10?6 m/m·K inclusive, and the respective plural rotors is made of a material which is more easily machined than the material of the rotational shaft.

Abstract: The present invention provides a multi-stage vacuum pump which includes: a housing in which a plurality of pumping chambers are formed, the pumping chambers being arranged in series and being in fluid communication with one another, one of the pumping chambers which is at one end of the series acting as an initial stage pumping chamber, another of the pumping chamber which is at the other end of the series acting as a final stage pumping chamber, the housing being provided with an inlet port for sucking a gas from a space to be evacuated into the initial stage pumping chamber, the housing being provided with an outlet port for exhausting the gas from the final stage pumping chamber; a Roots-type pump section occupying each of the pumping chambers; and a device for decreasing a temperature differential between the initial stage pumping chamber and the final stage pumping chamber.

Abstract: The present invention provides a multi-stage vacuum pump which includes: a housing in which a plurality of pumping chambers are formed, the pumping chambers being arranged in series and being in fluid communication with one another, one of the pumping chambers which is at one end of the series acting as an initial stage pumping chamber, another of the pumping chamber which is at the other end of the series acting as a final stage pumping chamber, the housing being provided with an inlet port for sucking a gas from a space to be evacuated into the initial stage pumping chamber, the housing being provided with an outlet port for exhausting the gas from the final stage pumping chamber; Roots-type pump sections occupying the respective pumping chambers, each of the Roots-type pump sections having a pair of intermeshed Roots-type profile rotors; and a pair of shafts adapted for rotation within the housing about their lengthwise axes in contra-rotational direction, the pair of shafts being secured to the respective

Abstract: The present invention provides a multi-stage vacuum pump which includes: a housing in which a plurality of pumping chambers are formed, the pumping chambers being arranged in series and being in fluid communication with one another, one of the pumping chambers which is at one end of the series acting as an initial stage pumping chamber, another of the pumping chamber which is at the other end of the series acting as a final stage pumping chamber, the housing being provided with an inlet port for sucking a gas from a space to be evacuated into the initial stage pumping chamber, the housing being provided with an outlet port for exhausting the gas from the final stage pumping chamber; Roots-type pump sections occupying the respective pumping chambers, each of the Roots-type pump sections having a pair of intermeshed Roots-type profile rotors; and a pair of shafts adapted for rotation within the housing about their lengthwise axes in contra-rotational direction, the pair of shafts being secured to the respective

Abstract: The present invention provides a multi-stage vacuum pump which includes: a housing in which a plurality of pumping chambers are formed, the pumping chambers being arranged in series and being in fluid communication with one another, one of the pumping chambers which is at one end of the series acting as an initial stage pumping chamber, another of the pumping chamber which is at the other end of the series acting as a final stage pumping chamber, the housing being provided with an inlet port for sucking a gas from a space to be evacuated into the initial stage pumping chamber, the housing being provided with an outlet port for exhausting the gas from the final stage pumping chamber; a Roots-type pump section occupying each of the pumping chambers; and a device for decreasing a temperature differential between the initial stage pumping chamber and the final stage pumping chamber.

Abstract: A vacuum pumping apparatus includes a pump housing 1 and a motor housing 8. The housings 1 and 8 are fastened together so as to be a sealed structure by O-rings 51-58 interposed therebetween. A shaft 17 of a driving device 70 and a driving shaft 15 carrying a rotor 2a are detachably connected via a coupling 91. During operation of the apparatus, a rotor chamber 41 in the pump housing 1 and a motor chamber 43 in the motor housing 8 are equalized in pressure, which requires no mechanical seal therebetween. The coupling 91 facilitates easy removal or detachment of a motor part B from a pump part A, which results in convenient maintenance of the pump part A.

Abstract: A multi-stage pump device includes a plurality of pump devices, each of the pump devices having a pump portion feeding working fluid under pressure, and a connecting portion provided between at least two of the pump devices, through which working fluid pumped by the respective pump devices passes. The connecting portion is expandable in a direction of the length thereof and is provided with a sealing structure to prevent a leakage of the working fluid. The connecting portion may be two telescopically arranged pipes or a bellows.

Abstract: A multistage vacuum pump assembly comprising plural independent pumping stages connected in series is disclosed. A first pumping stage located at one end of the series is connected to a room to be evacuated, and a final pumping stage located at the other end of the series is connected to the atmosphere. At least the first pumping stage comprises plural pumps connected mutually in parallel, so that the plural pumps together can achieve the vacuum capacity expected without being driven to an excessive rate of rotation.

Abstract: A refining method of decarburizing a molten steel containing a large quantity of chromium, which can be completed in a shorter period, and therefore, with reduced consumption of Ar gas, and with safety of operation. A mixed gas of O.sub.2 and Ar is blown into a molten steel in a refining vessel through a tuyere at the bottom of the vessel under atmospheric pressure, and when the C-concentration becomes to such a low level as 0.15% (by weight) or less, vacuum suction is applied to reduce the pressure to 150-200 Torr, and only Ar gas is blown. At the change of the refining conditions from atmospheric to vacuum or during the vacuum refining a reducing agent such as ferrosilicon is added to the molten steel to reduce Cr-oxides for recovery. Even if the amount of the reducing agent is less than that necessary for reducing all the Cr oxides, majority of Cr can be recovered. If an excess amount is used, a steel of low nitrogen in addition to low carbon is obtained.Whole or a portion of Ar can be replaced with N.sub.

Abstract: A Stirling engine generating system comprises a Stirling engine driven by solar heat which is used as a heat input source for the engine, a generator driven by the Stirling engine, a temperature sensor detecting the temperature of an operational gas enclosed in an operational space of the engine, an operational gas tank communicated with the operational space via a pair of conduits, one way valves interposed in the corresponding conduits so as to invert the flow direction of the operational gas in each conduit, opening and closing valves each of which is interposed in the respective conduit between the one way valve and the operational gas tank, a field magnet control device for adjusting the rotational speed of the generator and a temperature regulation device for controlling the opening and closing action of the opening and closing valves to vary the operational gas pressure in the operational space in response to a detected signal of the temperature sensor and for controlling the field magnet control devic

Abstract: A free piston Stirling engine includes a displacer fitted in a cylinder so as to be able to reciprocate and defining an expansion chamber and a compression chamber in the cylinder, an operational sealing area leading from the expansion chamber to the compression chamber and interposed a heater, a regenerator and a cooler in order, a free piston disposed so as to be able to reciprocate toward a direction which crosses a direction of the reciprocation of the displacer and defining an operational chamber which is communicated with the compression chamber and a buffer chamber at its both ends and a linear generator disposed around the free piston and connected with a storage battery at its output terminal via an AC/DC converter having one or more transformation ratios. According to this constitution, even though the load is larger than the output of the linear generator transitionary, it is possible to supply stable electric power by use of the storage battery.

Abstract: A Stirling engine includes a heater device for collecting solar radiation energy, a heater tube disposed in the heater device and connecting the expansion space and the compression space of cylinder containing a piston, and a transparent partition located in the heater device for defining a closed space. A heat storage material is positioned in the closed space and a temperature detecting apparatus is provided for detecting the temperature of the heat storage material. A pressure regulating arrangement regulates the pressure of a working gas in a working space located between the expansion space and the compression space of the cylinder. A control device controls the pressure regulating arrangement in response to a signal from the temperature detecting apparatus.

Abstract: An apparatus for fixing a cap (8) coated with a hot-melt adhesive on an end surface of a filter element (6), comprising a pair of vertical heating units (18, 19) installed in position (A) and an adjacent pair of vertical cooling units (20, 21) installed in position (B). The heating units (18, 19) comprises a pair of heaters (25, 29), each displaceable close to and away from the other so as to nip and release a pot assembly (9) accommodating the filter element (6) to be treated therebetween. The cooling units (20, 21) comprises a pair of coolers (30, 31) subjected to a similar movement. First, the pot assembly (9) occupies position (A) and is subjected to a heat treatment by the nip of the heaters (25, 29), causing melting of the hot-melt adhesive of the cap (8), and then transported to position (B) and subjected to a cooling treatment by the nip of the coolers (30, 31), causing solidification of the molten adhesive.

Abstract: Described is a working gas pressure control apparatus for a Stirling engine including a pressure boost valve provided in a minimum cycle pressure line connected to a working space by a first unidirectional valve, a pressure reducing valve provided in a maximum cycle pressure line connected to the working space by a second unidirectional valve, an operating lever for controlling the opening and closing of the pressure boost and pressure reducing valves, a compressor connected by the pressure reducing and the pressure boost valve to the cycle pressure lines, an unloading valve arranged in a circuit short-circuiting suction and discharge lines of the compressor, and a control unit for opening the unloading valve when engine rpm falls to a value lower than a preset rpm for engine idling, when the pressure boost valve is open and when the engine is operating in the steady state, thereby minimizing compressor load.

Abstract: 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.

Abstract: A highly active catalyst for olefin polymerization, which is resistant to catalyst poisons contained in olefins as polymerization raw material and according to which the percentage of amorphous polymer formed is small, is provided, which catalyst is obtained byreacting a reaction product (I) of an organoaluminum compound with an electron donor, with TiCl.sub.4,further reacting the resulting solid product (II) with an electron donor and an electron acceptor,mixing the resulting solid product (III) with an organoaluminum compound in an inert solvent,keeping the resulting catalyst dispersion at 0.degree. to 70.degree. C., andhaving a small amount of an .alpha.-olefin and an extremely small amount of carbonyl sulfide slowly absorbed in the dispersion kept as above, to thereby subject the dispersion to a preliminary polymerization.