US3415054A - Demonstration model of hot air motor and heat pump - Google Patents

Demonstration model of hot air motor and heat pump Download PDF

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US3415054A
US3415054A US624930A US62493067A US3415054A US 3415054 A US3415054 A US 3415054A US 624930 A US624930 A US 624930A US 62493067 A US62493067 A US 62493067A US 3415054 A US3415054 A US 3415054A
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cylinder
piston
displacer piston
displacer
working piston
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US624930A
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English (en)
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Harald Schulze
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Leybold Holding AG
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Leybold Holding AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/057—Regenerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/0435—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines the engine being of the free piston type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F2007/0092—Transparent materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2253/00—Seals
    • F02G2253/02—Reciprocating piston seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2253/00—Seals
    • F02G2253/04—Displacer seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2270/00—Constructional features
    • F02G2270/85—Crankshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the present invention relates to a demonstration model of a hot air motor and/or heat pump for demonstrating to students the fundamental operating principles of these devices.
  • Such demonstration models are known in which a working piston and a displacer piston are slidably mounted in a common cylinder and are mutually displaceably connected to a common crank drive.
  • the object of the present invention is to provide improvements in this type of demonstration model to simplify its manufacture, improve its operation, and increase its effectiveness of demonstration.
  • This invention relates to improvements in demonstration models of a hot air motor and/ or heat pump which includes a transparent cylinder, means for cooling at least a portion of the cylinder, at working piston slidably mounted within the cylinder, and a displacer piston slidably mounted within the cylinder between one end of the working piston and one end of the cylinder.
  • these improvements include a central recess in the end of the displacer piston facing away from the working piston, into which recess a projection secured to the cylinder housing may be introduced for receiving an element entering into heat exchange with the contents of the cylinder.
  • the gas flow through the hollow displacer piston is controlled in such a manner that compressed gas is passed from the compression side of the displacer piston toward the cylinder wall and flows from there along the cylinder wall into the chamber between the displacer piston and the working piston.
  • This measure serves for improving the 3,415,054 Patented Dec. 10, 1968 heat exchange with respect to the enclosing cylinder wall, which is cooled by a liquid or a gaseous cooling medium.
  • the displacer piston may expediently be hollow and may be filled with a porous packing.
  • This porous packing may be advantageously provided in a multi-layered fashion, preferably coarsely permeable at the intake side from the compression chamber, and finely permeable at the other side of the piston.
  • One layer of the porous packing preferably the one which is finely permeable, may consist of synthetic wool made from Teflon or the like.
  • Both the central recess of the displacer piston and the connecting chamber to the annular groove at the circumference of the piston may be provided with a porous packing so that the air flowing therethrough enters into heat exchange with this packing.
  • a material having a high heat capacity for example fine-wired copper wool, is suitable for this portion of the packing.
  • Teflon wool it is advantageous. to place the Teflon Wool at the upper end of the central recess of the displacer piston.
  • Synthetic wools such as Teflon or the like reduce the ice formation because the water vapor deposit is greatly reduced on Teflon.
  • FIGURE 1 is a vertical cross-sectional view of the cylinder portion of one embodiment of the invention.
  • FIGURE 2 is a partial vertical cross-sectional view of the displacer piston shown in FIGURE 1.
  • FIGURE 3 is an enlarged side elevation view, partly in section, of the crank mechanism for the embodiment shown in FIGURE 1.
  • FIGURE 4 is an elevational view, partly in section, of the crank mechanism for the embodiment shown in FIGURE 1 and taken substantially along the plane defined by reference line 44 of FIGURE 3.
  • the gas inlet and outlet thereof act as a heat exchanger which may be cooled by means of a cooling medium contained in a hollow displacer piston rod.
  • the displacer piston may be made-at least in the part thereof which faces away from the working piston-as a hollow body from transparent material such as glass. It is additionally advantageous to dispose in the central recess of the displacer piston interchangeable flow guiding rings for improving the heat exchange with the element which is introduced through the cylinder wall.
  • Such flow guiding rings may consist of cork, foam rubber, or the like and must be so dimensional with respect to the elements which are respectively inserted that the gas flow is guided past these elements at a high speed and closely adjacent thereto.
  • the working piston rod be tiltably positioned with respect to the displaced piston rod, and that the working piston be sealed to the cylinder wall by means of an annular groove with an O-shaped annular sealing ring and, in the same annular groove, that a porous lubricating ring be provided on the side of the O-ring adjacent to the displacer piston rod.
  • the displacer piston is also preferably sealed to the cylinder wall in the same manner as the working piston by means of an O-ring and a porous lubricating ring in a common annular groove.
  • the bottom of the displacer piston facing the working piston may advantageously be so beveled that it is approximately parallel to the surface of the Working piston in its tilted position. It is further expedient that the tiltable working piston be sealed ofl, with respect to the displacer piston rod which passes therethrough, by means of a resilient sealing element in the shape of a cap-type joint or gasket whose point of attachment to the working piston is offset in the axial direction with respect to the displacer piston rod.
  • the working piston may have a circumferential groove containing a resilient seal which communicates by way of a connection bore with the chamber above the working piston so that the loosely inserted resilient seal will be pressed against the inner wall of the cylinder housing by compression of the gas in the chamber.
  • the surface of the displacer piston may also engage or interlock with the projection which is attached to the end of the cylinder in the manner of an upper die and a matrix.
  • the cylinder wall is made from glass and cooled by an enclosing and equally transparent cooling water jacket.
  • the drive for the Working piston and the displacer piston is taken from a common crank drive in a manner known per se.
  • FIGURE 1 a cylinder 1 made from glass or plastic supports a displacer piston 2 and a working piston 3 which are slidably positioned within the cylinder with respect to one another.
  • the working piston 3 is rigidly secured to a hollow piston rod 4 which, along with a displacer piston 5, is connected to the drive shaft of a drive gear 7 by means of a lower crank drive or mechanism (FIGURES 3 and 4).
  • the displacer piston rod 5 is rigidly attached to the end of displacer piston 2 in the center thereof and passes through a central opening in the working piston 33, the central opening in working piston 3 being sealed by a resilient gasket 13.
  • the displacer piston rod 5 and working piston rod 4 are connected to the common crank drive approximately 90 out of phase with each other as shown in FIGURES 3 and 4.
  • the common crank drive is 1'0- tated by a drive wheel 7 which, when rotated, causes the two pistons to reciprocate with the cylinder approximately 90 out of phase with each other.
  • working piston 3 tilts slightly fro-m one side to the other due to the tilting of its piston rod 4 as the crank drive is revolved, but this slight tilting action does not break the gas seal between working piston 3 and the sides of cylinder wall 1.
  • displacer piston 2 The interior of displacer piston 2 is hollow to permit the flow of gas therethrough and is preferably packed with a porous material which will be described in detail later.
  • a flow guiding ring 17 is positioned to produce a rapid flow of gas in the immediate vicinity of an elongated object 18 projecting into the interior of the cylinder 1 through an opening 20 in the end thereof.
  • the elongated element 18 is sealed within the end 20 of the cylinder 1 by a gasket 19.
  • the elongated element 18 is shown as a thermometer in FIGURE 1, an electrical heating element or an object to be cooled or heated can be inserted in its place.
  • the transparent cylinder 1 is enclosed by a transparent cooling jacket 8 for receiving a cooling fluid such as water or air.
  • the area of the cylinder 1 which is to be cooled is defined by sealing rings 26 and 27 which communicate between the outer wall of cylinder 1 and the inner wall of cooling jacket 8.
  • a cooling fluid such as water or air is introduced into the space between sealing rings 26 and 27 and extracted therefrom through ports 34 and 35 which extend through the side Walls of cooling jacket 8.
  • the general operation of the demonstration model will first be discussed by describing several modes of operation thereof.
  • an electric heating element is placed into the interior of cylinder 1 in place of the thermometer 18.
  • the gas in cylinder 1 is essentially below displacer piston 2 and is compressed by the upward stroke of working piston 3 while at the same time being cooled by water jacket 8.
  • the compressed and cooled gas is moved upward by the downward motion of the displacer piston, and is then heated by the electric heating element. This expands the gas and drives the working piston 3 downward.
  • the gas in the cylinder is then moved down again by the upward motion of the displacer piston.
  • the gas within the cylinder is periodically moved from the heated part of the cylinder into the cooled lower part of the cylinder and back again.
  • the gas is passed through porous material within the hollow interior of the displacer piston, being cooled on its way down by the transfer of heat to the porous material and being heated on its way up by the heat contained in the porous material.
  • the device will operate as a refrigerator and cool the upper part of the cylinder to a temperature which is lower than that of the water cooled lower part of the cylinder. Under these conditions, if the direction of revolution of the drive gear is reversed, the device acts as a heat pump as follows: In the upper position of displacer piston 2, the working gas therebelow expands and extracts heat from the cooling Water. The expanded gas, heated to ambient temperature, is then moved upwardly by the downward motion of displacer piston 2 and compressed by the up ward motion of working piston 3, thus delivering heat to the cylinder Walls.
  • the compressed gas is moved down again by displacer piston 2.
  • the device acts as a heat pump, deriving heat from the cooling water and delivering this heat plus a quantity of heat corresponding to the expended mechanical work to the upper part of the cylinder to raise the upper part of the cylinder to a higher temperature.
  • demonstration model of this invention can be utilized to demonstrate the principles not only of hot air motors, but also of heat pumps and refrigerators in a highly eifective manner.
  • the working piston rod 4 is hollow and opens at one end into the interior of the cylinder through a bore 15 (FIGURE 1) and is fitted at the other end with a gas port 28 (FIGURE 4).
  • the hollow piston rod 4 is closed oif by a plug 29 (FIGURE 3) under the port 28.
  • a manometer can be coupled to the port 28 to measure the pressure within the cylinder during its operating cycle as a motor. When a manometer is not used, the port 28 is closed off to prevent the escape of air from the interior of the cylinder.
  • the displacer piston rod 5 is movable through a central opening in working piston 3, which central opening is sealed off by a resilient cap-type member 13 which is secured to working piston 3 by a clamp assembly 12.
  • a ring 30 of porous material containing a lubricant is attached to piston rod 5 below working piston 3 to provide lubrication for the portion of the piston rod passing through sealing member 13.
  • the displacer piston rod 5 is rigidly attached to an end piece 31 which is attached in spaced relation to the lower end of displacer piston 2 by a plurality of circumferentially spaced bolts such as bolt 32.
  • End piece 31 serves to define a radial gap at the bottom of displacer piston 2 to direct the flow of gas from the hollow interior 16 of displacer piston 2 to the periphery of the piston so that the gas will be directed against the water cooled walls of cylinder 1 for more effective cooling.
  • Working piston 3 has an annular groove 9 at the circumference thereof containing an O-shaped annular seal or gasket 10.
  • O-shaped annular seal 10 Arranged above the O-shaped annular seal 10 on the side of the displacer piston 2 is a circular diskshaped felt ring or washer 11 which is impregnated with a lubricant. It is also expedient to cause the annular groove 9 to communicate-within the inserted rubberelastic O-shaped annular seal or gasket 10-with the chamber above the working piston 3 by means of an angular bore 31.
  • the central recess 16 disposed within displacer piston 2 may be partially sealed off by means of an inserted cork ring 17 so that the thermometer 18, which projects with its bulb into the central recess 16, is positioned in favorable heat exchange with the emerging gas flow.
  • the thermometer 18 is positioned in an inset plug or stopper 19, which is inserted into a correspondingly shaped projection 20 of the cylinder 1.
  • Another O-shaped annular seal or gasket 21 is provided as a seal between the displacer piston 2 and the cylinder 1 and rests in an annular groove 22 in the displacer piston 2.
  • a felt ring 23 for receiving the lubricant supply is positioned at the side of the O-shaped annular seal 21 facing away from the Working piston 3.
  • a finely porous layer 24 of Teflon wool Visible in the inner hollow chamber 16 of the displacer piston 2 is a finely porous layer 24 of Teflon wool which is followed by a coarsely porous layer 25 of copper Wool or the like.
  • the copper Wool extends from the central inner chamber radially toward the circumferential surface of the displacer piston and reaches approximately to the outermost circumferential limit of the displacer piston 2.
  • the porous layers 24 and 25 act as a heat exchanger for gas flowing through the hollow interior of displacer piston 2 as described above.
  • a demonstration model of a heat pump and/or hot gas motor including a transparent cylinder, means for cooling at least a portion of said cylinder, a Working piston slidably mounted within said cylinder, and a displacer piston slidably mounted within said cylinder between one end of said working piston and one end of said cylinder, the improvement comprising an inwardly projecting element from said one end of said cylinder interchangeably secured thereto, means on said one end of said cylinder and on the adjacent end of said displacer piston for receiving said element and positioning the element to enter into a heat exchange relationship with gas within said cylinder, said means being arranged to cause said gas to flow through the displacer piston in close surrounding relationship to said element for facilitating a good heat exchange between said gas and said element, said element being readily removable from said one end of the cylinder, and said means for receiving and positioning said element including a central recess in said adjacent end of said displacer piston for receiving said projecting element.
  • a demonstration model as defined in claim 1 Wherein a coolable heat exchanger is provided in said displacer piston and gas flowing through said displacer piston passes over said heat exchanger and then along the Wall of the cylinder between the displacer piston and the working piston.
  • a demonstration model as defined in claim 5 wherein said means at the end of said displacer piston adjacent to said working piston comprises an end piece attached in spaced relation to the end of said displacer piston for directing the gas flow through the center thereof against the walls of said cylinder.
  • a heat pump and/or hot air motor including a transparent cylinder, means for cooling at least a portion of said cylinder, a working piston slidably mounted within said cylinder, and a displacer piston slidably mounted within said cylinder between one end of said working piston and one end of said cylinder, the improvement comprising means on said one end of said cylinder and on the adjacent end of said displacer piston for receiving an element and positioning the element to enter into a heat exchange relationship with the gas within said cylinder, said element being an inwardly projecting member removably secured to said one end of the cylinder, and said means for receiving and positioning said element including a central opening in the adjacent end of said displacer piston for receiving said projecting memher, said displacer piston is hollow to permit gas flow through the center thereof and further including a packing of porous material Within the hollow center of said displacer piston, said packing of porous material varies in density from a relatively coarse packing at the end of the displacer piston adjacent to the working piston to
  • a heat pump and/or hot air motor including a transparent cylinder, means for cooling at least a portion of said cylinder, a working piston slidably mounted within said cylinder, and a displacer piston slidably mounted within said cylinder between one end of said working piston and one end of said cylinder, the improvement comprising means on said one end of said cylinder and on the adjacent end of said displacer piston for receiving an element and positioning the element to enter into a heat exchange relationship with the gas Within said cylinder, said element being an inwardly projecting member removably secured to said one end of the cylinder, and said means for receiving and positioning said element including a central opening in the adjacent end of said displacer piston for receiving said projecting member, said displacer piston being rigidly attached to a central piston rod which passes through an opening in said working piston, said working piston being rigidly attached to a tiltable piston rod which is eccentrically positioned with respect to the displacer piston rod, said working piston having an annular groove in the outer surface thereof containing
  • a heat pump and/or hot air motor including a transparent cylinder, means for cooling at least a portion of said cylinder, a working piston slidably mounted within said cylinder, and a displacer piston slidably mounted within said cylinder between one end of said working piston and one end of said cylinder, the improvement comprising means on said one end of said cylinder and on the adjacent end of said displacer piston for receiving an element and positioning the element to enter into a heat exchange relationship with the gas within said cylinder, said element being an inwardly projecting member removably secured to said one end of the cylinder, and said means for receiving and positioning said element including a central opening in the adjacent end of said displacer piston for receiving said projecting member, said working piston is tiltable, and the end of said displacer piston adjacent to said working piston, is beveled so that its surface will be approximately parallel to said working piston in the tilted position thereof.
  • a heat pump and/or hot air motor including a transparent cylinder, means for cooling at least a portion of said cylinder, at working piston slidably mounted within said cylinder, and a displacer piston slidably mounted within said cylinder between one end of said working piston and one end of said cylinder, the improvement comprising means on said one end of said cylinder and on the adjacent end of said displacer piston for receiving an element and positioning the element to enter into a heat exchange relationship with the gas within said cylinder, said element being an inwardly projecting member removably secured to said one end of the cylinder, and said means for receiving and positioning said element including a central opening in the adjacent end of said displacer piston for receiving said projecting member, said displacer piston being rigidly attached to a central piston rod which passes through an opening in said working piston, said working piston being rigidly attached to a tiltable piston rod which is eccentrically positioned with respect to the displacer piston rod, and a flexible sealing element attached to said working piston for slidably
US624930A 1966-04-05 1967-03-21 Demonstration model of hot air motor and heat pump Expired - Lifetime US3415054A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL53283A DE1286807B (de) 1966-04-05 1966-04-05 Heissluftmotor bzw. Waermepumpe nach dem Stirling-Prinzip

Publications (1)

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US3415054A true US3415054A (en) 1968-12-10

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US (1) US3415054A (no)
DE (1) DE1286807B (no)
FR (1) FR1517409A (no)
GB (1) GB1112060A (no)
NO (1) NO115723B (no)

Cited By (8)

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US3635017A (en) * 1970-04-23 1972-01-18 Donald A Kelly Composite thermal transfer system for closed cycle engines
US3650118A (en) * 1969-10-20 1972-03-21 Cryogenic Technology Inc Temperature-staged cryogenic apparatus
US4501120A (en) * 1980-03-28 1985-02-26 Helix Technology Corporation Refrigeration system with clearance seals
US4543792A (en) * 1982-09-09 1985-10-01 Helix Technology Corporation Refrigeration system with clearance seals
US5012650A (en) * 1989-10-11 1991-05-07 Apd Cryogenics, Inc. Cryogen thermal storage matrix
WO1993018354A1 (de) * 1992-03-05 1993-09-16 Viessmann Werke Gmbh & Co. Aussenbeheizte, regenerative wärme- und kältemaschine
US20050268604A1 (en) * 2003-09-25 2005-12-08 Takashi Takahashi Stirling cycle engine
CN108223190A (zh) * 2017-12-26 2018-06-29 宁波华斯特林电机制造有限公司 一种新型回热结构

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US3698370A (en) * 1970-09-03 1972-10-17 Megatech Corp Transparent internal combustion engine
US4404808A (en) * 1981-08-10 1983-09-20 Helix Technology Corporation Cryogenic refrigerator with non-metallic regenerative heat exchanger
US4711091A (en) * 1986-02-21 1987-12-08 Mitsubishi Denki Kabushiki Kaisha Apparatus for preventing the rise of oil in a stirling engine
US5146124A (en) * 1987-10-08 1992-09-08 Helix Technology Corporation Linear drive motor with flexible coupling
DE3812427A1 (de) * 1988-04-14 1989-10-26 Leybold Ag Verfahren zur herstellung eines regenerators fuer eine tieftemperatur-kaeltemaschine und nach diesem verfahren hergestellter regenerator

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DE26668C (de) * H. MARTINI in Chemnitz Geschlossene Heifsluftmaschine
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US309163A (en) * 1884-12-09 Insom
US1042560A (en) * 1911-02-11 1912-10-29 Louis Kessler Air and gas engine.
US2726482A (en) * 1951-05-08 1955-12-13 Nosco Plastics Toy automobiles
US2797971A (en) * 1955-11-14 1957-07-02 Cleveland Pneumatic Tool Co Sectional fluid seal
US3117414A (en) * 1961-07-14 1964-01-14 Wisconsin Alumni Res Found Thermodynamic reciprocating apparatus
US3218815A (en) * 1964-06-17 1965-11-23 Little Inc A Cryogenic refrigeration apparatus operating on an expansible fluid and embodying a regenerator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650118A (en) * 1969-10-20 1972-03-21 Cryogenic Technology Inc Temperature-staged cryogenic apparatus
US3635017A (en) * 1970-04-23 1972-01-18 Donald A Kelly Composite thermal transfer system for closed cycle engines
US4501120A (en) * 1980-03-28 1985-02-26 Helix Technology Corporation Refrigeration system with clearance seals
US4543792A (en) * 1982-09-09 1985-10-01 Helix Technology Corporation Refrigeration system with clearance seals
US5012650A (en) * 1989-10-11 1991-05-07 Apd Cryogenics, Inc. Cryogen thermal storage matrix
WO1993018354A1 (de) * 1992-03-05 1993-09-16 Viessmann Werke Gmbh & Co. Aussenbeheizte, regenerative wärme- und kältemaschine
US20050268604A1 (en) * 2003-09-25 2005-12-08 Takashi Takahashi Stirling cycle engine
CN108223190A (zh) * 2017-12-26 2018-06-29 宁波华斯特林电机制造有限公司 一种新型回热结构
CN108223190B (zh) * 2017-12-26 2020-05-22 宁波华斯特林电机制造有限公司 一种新型回热结构

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FR1517409A (fr) 1968-03-15
NO115723B (no) 1968-11-18
DE1286807B (de) 1969-01-09
GB1112060A (en) 1968-05-01

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