Abstract: An air conditioning system of the present invention has a refrigerant circuit including a compressor, an oil separator, a condenser, a expansion device, an evaporator, a first accumulator, and a second accumulator which are connected in order by piping, said evaporator, said first accumulator, said second accumulator, and said compressor being connected in series; a first oil return bypass for connecting said oil separator and a connection pipe between said first and second accumulators; and a second oil return bypass for connecting said first accumulator and a connection pipe between said second accumulator and said compressor.

Abstract: In a Vuilleumier heat pump, hot and cold displacers are supported by coil springs in respective buffer chambers. Further, there are respectively provided forced vibration systems of the hot and cold displacers using, as exciting force, force applied to respective displacer rods due to a difference between a pressure fluctuation of a working gas in an inner working space and a pressure in the buffer chambers. A linear motor is also provided to drive the hot displacer so as to reciprocate. It is thereby possible to provide the Vuilleumier heat pump in which a mechanism for driving the hot and cold displacers can have a small-sized and simplified structure, and no restriction is imposed on an arrangement of hot and cold cylinders.

Abstract: The present invention relates to a display guide apparatus of elevator facilitating alteration of display format and to its display method. A display guide apparatus according to the present invention comprises an elevator control unit, an information producing unit, and an information display control unit. The information display control unit is so configured that an auxiliary memory medium, which has stored therein information required for displaying the running information of the elevator, may be mounted thereon. At least information required for displaying the running information of the elevator is supplied from the auxiliary memory medium. Information required for displaying general information is supplied from the information producing unit. On the basis of information relating to the running situation of the elevator supplied from the elevator contorl unit, the running information of the elevator and the general information are displayed by display units disposed at least at halls to perform guidance.

Abstract: In a vibration-reducing apparatus for a direct-acting type stirling engine, a change of pressure caused by the reciprocal movement of a displacer is applied to a power piston to produce a mechanical force, and the mechanical force is converted into an electric power by a direct-acting type electric generator which is directly connected to the power piston so as to effect reciprocating movements with the power piston.

Abstract: A seal mechanism for a Stirling engine has an upper and lower piston ring mounted on a displacer piston with a space therebetween and at least one piston ring mounted on a power piston. The seals produced by the piston rings of the displacer piston are given directionality in opposite directions so that the pressure within the space between the upper and lower piston rings is always higher or lower than the pressure within the expansion space and the compression space of the engine. In a preferred embodiment, the displacer piston rings each comprise two loosely-fitting outer rings which surround an inner ring. Air vents are formed in one surface of each of the inner rings between the center and the outer surface of the inner ring. The inner rings of the upper and lower piston rings are oriented so that the air vents face in opposite directions. Means for imparting directionality in the same direction to the seals produced by the power piston rings may also be provided.

Abstract: An apparatus for preventing lubricating oil from rising to the working spaces of a Stirling engine has a first and a second oil-absorbing member disposed within a cylindrical member in which a rod reciprocates. The first oil-absorbing member is secured to the rod with its outer periphery in sliding contact with the inner wall of the cylindrical member, and the second oil-absorbing member is secured to the cylindrical member with its inner periphery in sliding contact with the rod. A first baffle plate having a hole which is larger than the rod is secured to the cylindrical member immediately below and in intimate contact with the second oil-absorbing member. The first baffle plate makes the flow speed of gas through the second oil-absorbing member higher from above to below than from below to above. As a result, oil is continually blown downwards by a blast of accelerated gas and is returned to the crankcase of the engine.

Abstract: A heat exchanger for a Stirling engine has a domed cylinder which serves as a high-temperature cylinder and a regenerator housing. The domed cylinder has a smoothly-changing cross-sectional shape so that stress concentrations will not develop therein. A thin inner liner which is inserted into the domed cylinder divides the inside of the domed cylinder into an expansion space and a regenerator space. A cylindrical regenerator is coaxially disposed inside the regenerator space. A cylindrical cooler is coaxially disposed below the regenerator with its inner surface forming the outer periphery of the compression space of the engine. The expansion space and the regenerator space are connected with one another by a plurality of heater tubes which are secured to the domed cylinder.

Abstract: A seal means for use in the Stirling engine or the like, the seal means comprising: a cylinder including a piston reciprocating therein, and a buffer chamber located in one of the spaces produced at the both sides of the piston; a tank for storing the working fluid in the buffer chamber when the engine is at rest, the tank being located outside the cylinder; a means for introducing the working fluid in the tank into the buffer chamber under pressure when the engine is started; a crank shaft driven by means of the piston through a piston rod; a crankcase for accommodating the crank shaft; a plurality of packings for preventing the working fluid in the buffer chamber from entering the crankcase by flowing along the outer surface of the moving piston rod, the packings being arranged in contact with the outer surface of the piston rod; and a means for returning the working fluid leaked in the packings from the buffer chamber through the moving piston rod to the buffer chamber.

Abstract: A Stirling engine wherein a pressure variation is provided by a reciprocative movement of a displacer and is effected upon a power piston to obtain an output motive force. A first elastic film is provided at the displacer rod projecting into the crankcase so as to produce a first hermetically sealed space bounded by the expansion cylinder. A second elastic film is provided at the power piston rod so as to produce a second hermetically sealed space below the power piston. A pressure adjusting device equalizes the mean pressure of a reactive space, which includes the first and the second hermetically sealed spaces, and that of the crankcase.

Abstract: An ac type line concentrator for use in a data communication system, comprising a crosspoint switch circuit. The crosspoint switch circuit is constituted by a plurality of crosspoint switches capable of switching an analog signal (hereinafter referred to as an analog switch), so that a carrier signal modulated by a data signal may be transferred from one of m incoming lines connected with m terminal units to a selected one of n(n<m) outgoing lines connected with a central unit through the ac type line concentrator without being demodulated.