US3547005A - Device with rolling diaphragm seal separating gas and liquid - Google Patents

Device with rolling diaphragm seal separating gas and liquid Download PDF

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Publication number
US3547005A
US3547005A US621847A US3547005DA US3547005A US 3547005 A US3547005 A US 3547005A US 621847 A US621847 A US 621847A US 3547005D A US3547005D A US 3547005DA US 3547005 A US3547005 A US 3547005A
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space
liquid
rolling diaphragm
gas
pressure
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US621847A
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English (en)
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Herman Henricus Maria Van D Aa
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US Philips Corp
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US Philips Corp
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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
    • F02G1/0535—Seals or sealing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/06—Bellows pistons
    • 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
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
    • F02G2243/02—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes having pistons and displacers in the same cylinder
    • F02G2243/04—Crank-connecting-rod drives
    • F02G2243/08—External regenerators, e.g. "Rankine Napier" engines
    • 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
    • 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
    • F02G2253/08—Stem with rolling membranes
    • 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
    • F02G2253/10—Piston with rolling membranes
    • 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
    • F02G2253/50—Liquid seals

Definitions

  • I HERMAN 11.1mm DER AA AGENT DEVICE WITH ROLLING DIAPHRAGM SEAL SEPARATING GAS AND LIQUID Devices of the above type are known in hot-gas reciprocating engines, compressors, and the like. These machines include a rolling diaphragm seal between the piston and the cylinder in order to prevent, eithergaseous medium leaks away from the working space, or contaminations such as lubricant from entering the working space.
  • the rolling diaphragm bounds a liquid space with its side remote'from the working space.
  • Liquid can be I supplied to this space by pumping means, a control device which is capable of conducting liquid away from this space such that the pressure differential across a rolling diaphragm (which faces the space with its concave side) does not fall below a given minimum value, and that said pressure dif ferential (across a rolling diaphragm which faces the gas space with its convex side) does not exceed a'given maximum value.
  • the pumping means are usually coupled directly to the shaft of these devices; So when the devices are not operating, no liquid will be supplied. During the inoperable period the liquid will leak away from the liquid space. When the device is started again no liquid or an insufficient amount of liquid will be present initially for supporting the rolling diaphragm. This means that when the desired operating pressure occurs immediately in the working space, the pressure differential across the rolling diaphragm will have an unacceptable value. For that reason it has so far been impossible to start the device directly with the desired operating pressure.
  • the device accordingto the invention is characterized in that the said liquid space communicates through a duct with a space containing a gas and/or a liquid, means being provided for bringing medium from the said space into the liquid space when the pressure differential across the rolling diaphragm exceeds a maximum value which may be adjustable or falls below a minimum value which may be adjustable.
  • the pressure differential across the rolling diaphragm becomes too large or too small, additional medium is applied to the liquid space below the rolling diaphragm so that a good support of the rolling diaphragm is ensured at all times.
  • the means for supplying additional medium to the liquid space may be constituted by a pump.
  • the pressure of the medium in the said space is always higher than the pressure in the liquid space, a controllable valve being arranged in the communication duct which valve is opened when the pressure differential across the rolling diaphragm exceed s a maximum value which may be adjustable or falls below a minimum value which may be adjustable.
  • the valve may be a spring-loaded check valve or a valve controlled by the pressure differential across the rolling diaphragm.
  • the liquid space is in open communication with the said space through the communication duct, the space containing a liquid under a pressure which is always substantially equal to the pressure in the gas space reducedand increased, respectively, by the desired differential pressure across the rolling diaphragm.
  • the said communication duct which comprises a value and adjoins the liquid space with its other side directly adjoins the gas space sealed by the rolling diaphragm.
  • a further favourable embodiment of the device according to the invention in which the rolling diaphragm faces the gas space with its concave side is characterized in that the communication duct comprising a valve and adjoining the liquid space adjoins with its other side a further space which is entirely filled with liquid, which further space is separated from the gas space sealed by the rolling diaphragm by a freely movable wall or part of a wall. Consequently, the liquid in the further space will be under the same pressure as that which prevails in the sealed gas space. If the pressure differential across the rolling diaphragm exceeds the maximum value, the valve in the communication duct will be opened, so that liquid is forced out of the further space into the liquid space. As a result of this it is achieved again that the pressure differential across the rolling diaphragm always remains within the desired limits.
  • the communication duct which comprises a valve and adjoins the liquid space, adjoins with its other side a container which contains a gas and/or liquid under a pressure which is at least equal to the pressure in the sealed gas space increased by the minimum. permissible differential pressure across the rolling diaphragm.
  • the pressure in the liquid space will always have'to be higher by a given amount than the pressure in the sealed gas space. This means that if medium is to be supplied to said space it will be necessary that said medium can be suppliedunder a pressure which is higher than the desired pressure in that space.
  • a separate container is provided in which the desired high pressure prevails.
  • the communication duct is constructed so as to have a low resistance to flow.
  • the said control device is also incorporated in the communication duct.
  • a further embodiment of the device according to the invention is characterized in that while the communication duct adjoining the liquid space adjoins with its other side a gas-filled space, at least when the valve is in its open position, substantially no pressure variations occur in the gas space sealed by the rolling diaphragm. Because gas has a certain compressibility, also the gas in the liquid space will be compressed alternately more or less, by pressure variations if these occur in the sealed space so that volume variations occur, as a result of which the rolling diaphragm will be expanded more or less which has adverse influences on the life of said rolling diaphragm.
  • a further embodiment of the device according to the invention which comprises at least one cylinder and a pistonlike body reciprocating therein and varying with its one side the volume of a working space and bounding with its other side a buffer space having such a volume that the volume variations caused by the movement of the piston produce substantially no pressure variations in that buffer space
  • the pistonlike body being provided with a piston rod which is passed through the wall of the buffer space
  • a seal being arranged both between the pistonlike body and the cylinder and between the piston rod and the wall of the buffer space, is characterized in that only the seal between the piston rod and the wall of the bufi'er space is constructed as a rolling diaphragm, the other side of the communication duct which adjoins the liquid space below the rolling diaphragm and comprises a valve opening into the buffer space.
  • This device may be immediately started at all times with the desired working pressure in the working space and in the buffer space also if an insufficient quantity of liquid is present in the liquid space for supporting the rolling diaphragm.
  • the valve in the communication duct will be opened and the rolling diaphragm be supported temporarily by gas which'is under the pressure which prevails in the buffer chamber.
  • the pumping means will have supplied a sufficient quantity of liquid, after which the rolling diaphragm is supported by liquid.
  • a further favourable embodiment of the device according to the invention is constructed as a hot-gas reciprocating engine of the displacer type and comprises at least one cylinder having a piston and a displacer reciprocating therein for varying the volumes of a compression space and an expansion space having different average temperatures;
  • the spaces communicate with one another with a generator arranged in said communication so that a working medium can flow there and back.
  • the piston bounds with its side remote from the working space a buffer space having such a volume that the volume variations produced by the movement of the piston substantially cause no pressure variations;
  • the piston comprises a piston rod which is passed through the wall of the buffer space and the displacer provided with a displacer rod which is passed through the piston and the piston rod, with seals provided between the piston and the cylinder, between the piston rod and the wall of the buffer space, and between the piston and the displacer rod.
  • This device is characterized in that the seal between the piston rod and the wall of the butter space is constituted by a rolling diaphragm, the seal between the piston rod and the displacer rod being constituted by a nonhermetical seal and a rolling diaphragm, the space between these two seals being in open communication with the bufier space and the two liquid spaces below the rolling diaphragms being in open communication with one another.
  • the said communication duct comprises a valve adjoining at least one of the said liquid spaces and communicating said spaces with the buffer space.
  • the invention provides an extremely simple measure for starting devices which comprise rolling diaphragm seals supported by liquid immediately at the desired operating pressures, while this measure during operation serves as a safety when interferences occur in the liquid supply to the liquid space below the rolling diaphragm so that said rolling diaphragms are not exposed to too largepressure differentials.
  • FIGS. 1, 2 and 3 diagrammatically show cross-sectional views of three embodiments of devices which comprise rolling diaphragm seals supported by liquid, the rolling diaphragms facing the sealed gas space with their concave sides.
  • FIGS. 4 and 5 diagrammatically show cross-sectional views of two embodiments of devices which comprise rolling diaphragm seals supported by liquid, the rolling diaphragms facing the gas space with their convex sides.
  • FIG. 6 diagrammatically shows a device comprising a rolling diaphragm seal, in which, when the pressure differential across the rolling diaphragm falls below a given value, liquid is supplied below the rolling diaphragm by means of an additional pump.
  • FIGS. 7 and 8 show two embodiments of hot-gas reciprocating engines of the displacer type which are provided with a buffer space below the piston and in which liquid-supporting rolling diaphragm seals are used.
  • reference numeral 1 denotes a cylinder in which a piston 2 reciprocates which is connected, through a piston rod 3, to a gear not shown.
  • a piston 2 When the piston 2 moves, its upper side varies the volume of a working space 4 containing gas.
  • the seal between the piston 2 and the cylinder 1 is formed by rolling diaphragm 5 which, at least during normal operation, is supported by liquid contained in a liquid space 6 below the rolling diaphragm.
  • the liquid space 6 is bounded on its upper side by the rolling diaphragm and on its lower side by the two annular surfaces 7 and 8 of equal area so that, when the piston moves, the volume of the space 6 will remain constant.
  • the piston 2 further comprises an oil pump ring 9 which pumps lubricating oil which is on the wall of the cylinder to the space 6.
  • a control device 10 is provided. This device consists of 'a housing 11, defining therein a control chamber which is divided into two parts by a diaphragm 12.
  • the part 13 communicates with the liquid space 6 through a duct 14, while the part 15 communicates with the gas space 4 through a duct 16.
  • a liquid outlet pipe 17 further communicates with the part 13 which duct can be closed by a valve 18 which is connected to the diaphragm 12.
  • the diaphragm 12 furthermore comprises a sliding member 19 which is movable in the duct 16 and can close or open a duct 20 in accordance with the position of the diaphragm 12.
  • this diaphragm is forced down through such a distance that the slide 19 opens the duct so that gas from the space 4 enters the spaces 6 and 13 through the ducts 16 and 20.80 inthat case, the rolling diaphragm 5 is temporarily supported by gas. This has no adverse influence for the rolling diaphragm. if only no or substantially no pressure variations occur in the space 4.
  • the diaphragm will be supported and stretched in the correct manner such that the device can start at the desired operating pressure in the space 4. It is desirable that the ducts 16, 20 and 14 in this device should have a small resistance to flow so that the gas from the space 4 may enter the space 6 without delay.
  • the duct 20 opens directly near the outlet 17, so that the gas from the space 4 which has reached the space below the rolling diaphragm can disappear out of the liquid space as rapidly as possible again when liquid is supplied by the pump ring 9.
  • FIG. 2 shows a device :which in outline entirely corresponds to the device shownin FIG. 1.
  • the liquid space 6, however, in this device does not communicate through a communication duct to the working space 4, but with a liquid container 26.
  • This container 26 is sealed-at its top by afreely movable pistonlike member 27 which with its otherside bounds aspace 28 which is in open communication with'the gas space 4. This means that the liquid in the space 26 will always be under the same pressure as that which prevails in thespace 4.
  • the diaphragm 12 of the control device 10 will be forced downwards to such an extent that the valve 29 is opened so that liquid from the space 26 is forced to the space 6.
  • FIG. 3 shows a device which again corresponds to the devices shown in the preceding FIGS.
  • the control device 10 is large so that a considerable quantity of liquid is present in the space 13.
  • the space 13 is in open communication with jthe liquid space 6 through a communication duct 14,
  • the space 13 is separated from the space 15 by a freely movable'pistonlike member 30, which latter space is in open communication with the gas space4.
  • the liquid space 6 communicates, through a duct 35 having a low resistance to flow, with a container 36 which contains gas or liquid under a pressure which is at least equal to the pressure in the gas space 4 increased by the desired pressure differential across the rolling diaphragm 5.
  • A. valve 37 the opening and closing of which is actuated by the movement of the diaphragm 12, is arranged in the duct 35.
  • the diaphragm 12 will assume such a position that the valve 37 is opened so that medium from the container 36 enters the space below the rolling diaphragm through the duct 35.
  • the rolling diaphragm is further supported-by said medium.
  • the medium in the container 36 may be a -gas.,1n the alternative case it is desirable to use liquid as a-medium. In this manner it is reached again, that at those instants at which the pumping ring 9 supplies an insufficient amount of liquid, or has not yet been capable of supplying a sufficient amount of liquid, supporting medium is obtained from another source. in the device shown in FIG. 4, the supporting medium is temporarily obtained from an additional high-pressure container 36.
  • the device shown in FIG. 5 again comprises a rolling diaphragm 5 which faces the gas space 4 with its convex side.
  • FIG. 6 shows a device which in outline corresponds to those municates with a liquid container 41 through a duct 40.
  • a pump 42 in the duct 40 a pump 42 is arranged'which transports liquid from the space 41 to the liquid space 6 andcan supply more liquid per unit time than the pumping ring-.9.
  • the control of this supply of liquid to the space 6 can be effected in two manners. Firstly, the pump 42 may be driven intermittently in that sense, that, dependent upon the position of the diaphragm 12, the control 43 actuates or deactuatesthe driving. Secondly, the pump 42 may run continuously, a controllable valve 44 being arranged in the duct 40 and, in addition, a circulating duct 45 being arranged across the pump 42.
  • controllable valve is operated by the control device 43 in accordance with the position of the diaphragm 12. If insufficient if, by some cause or other an insufficient amount of liquid is present in the spaces 6 and 13, the gas pressure in the space 15 will ensure that the piston 30 is forced downwards. As a result of this, first of all the valve 34 will be forced on its seating and furthermore liquid will be forced from the space 13 to the space 6 so that the rolling diaphragm remains readily supin the correct manner, the pressure of the liquid in the space 6 will always have to be higher by a certain amount than the pressure of the gas in the space 4. This is reached by arranging the spring 22 in the control device 10 over the diaphragm 12.
  • FIG. 7 shows diagrammatically and not to scale a hot-gas reciprocating engine of the displacer type.
  • This engine comprises a cylinder 70 in which a piston 72 and a displacer 73 reciprocate.
  • the piston 72 and the displacer 73 are connected by a piston rod 74 and a displacer rod 75, respectively, to a gear not shown which moves said members with the desired mutual phase.
  • the piston 72 bounds with its upper side a compression space 76 while the displacer 73 bounds with its upper side an expansion space 77.
  • the compression space 76 and the expansion space 77 communicate with one another through a cooler 78, a regenerator 79, and a heater80.
  • Below the piston 72 there is a buffer space 81 of such a volume that the volume variations in.
  • This space produced by the movement of the piston 72 result in substantially no pressure variations.
  • the seal between the piston 72 and the cylinder 70 is formed by a rolling diaphragm 82 and the seal between the piston 72 and the displacer rod 75 is formed by a rolling diaphragm 83.
  • the space 84 communicates, through a duct 90 with a control device of the same construction as shown in FIG. 1. This control device further communicates with the compression space 76 through a duct 91. The operation of this control is entirely identical to that shown in FIG. 1 and will not be further described.
  • the liquid space 86 communicates through a duct 92 which comprises a spring-loaded check valve 93 with the compression space 76. Furthermore, an aperture 94 is provided in the wall of the liquid space 86 through which aperture liquid can be conducted away from the space 86 if the pressure differential across the rolling diaphragm 83 would become too small. If on.the contrary the pressure differential across the rolling diaphragm 83 becomes too large, the check valve 93 will be opened so that gas from the compression space 76 can enter the space 86 below the rolling diaphragm.
  • the valve 96 in the duct 97 will be opened, so that the working space is made to communicate with a space in which the same average pressure prevails as in the working space. Then the desired operating pressure can be adjusted in the working space; the control valve 93 and the valve 95 are opened because no liquid is present in the spaces 84 and 86, so that also gaseous medium is admitted to these spaces; thus during starting, at least at the beginning thereof, the rolling diaphragms 82 and 83 are supported by a gas.
  • this may be'done readily in this case since, because the working space communicates with another space, no pressure variations will occur during the starting period so that the gas support for the rolling diaphragms will be sufficient.
  • FIG. 8 shows another embodiment of the hot-gas reciprocating engine shown in FIG. 7.
  • the seal between the piston 72 and the cylinder 70 is formed by the. piston rings 100.
  • the seal between the piston 72 and the displacer rod 75 is formed by piston rings 101.
  • the seal between the piston rod 74 and the wall of the buffer space 81 is formed by a rolling diaphragm 102, while the seal between the displacer rod 75 and the piston rod 74 is formed by a rolling diaphragm 103.
  • the rolling diaphragm 102 there is the buffer space 81, while above the rolling diaphragm 103 the space 108 is present which, through an aperture 109, is in open communication with the buffer space 81 so that, both above the rolling diaphragm 102 and above the rolling diaphragm 103, no pressure variations will occur.
  • the liquid spaces 104 and 106 are in open communication with one another through an aperture 110, while these two spaces which are in open communication with one another communicate with the buffer space 81 through a duct 111 comprising a spring-loaded check valve 112.
  • the meaure according to the invention is also useful in the case of disturbances of liquid supply to the liquid spaces occurring during the operation. In fact, in that case the deficiency of liquid will also be replenished by medium, gas or liquid, which is obtained from another source.
  • liquid supply means are always represented by oil-pumping piston rings, it will be clear that instead of these pumping rings also a normal oil pump coupled to the shaft of the device may be used.
  • a rolling diaphragm seal secured between the element and the bore for defining and separating principal gas and liquid spaces for containing gas and liquid fluid mediums, the seal having a concave side and an opposite convex side, one of the sides facing the principal gas space and the other side facing the principal liquid space;
  • a control device comprising (i) a control housing, (ii) first and second duct means respectively interconnecting the control housing with said principal gas and liquid spaces for communicating pressure variations and fluid mediums therethrough, and (iii) means in the control housing (A) responsive to said excessive pressure and operative to flow liquid out of the liquid space; and (B) responsive to said insufficient pressure and operative to flow gas from said gas space to said liquid space.
  • said first and second duct means have a low resistance to flow of said fluid medium.
  • control device forms a control chamber having separate control spaces for containing gas and liquid respectively, said first duct interconnecting said principal gas and control gas spaces, said second duct interconnecting said principal liquid and control liquid spaces, the device further comprises a third duct interconnecting the first and second ducts, and a valve means operable with said first and third ducts for permitting said flow of gas therethrough from the principal gas space to the principal liquid space.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Damping Devices (AREA)
US621847A 1966-03-22 1967-03-09 Device with rolling diaphragm seal separating gas and liquid Expired - Lifetime US3547005A (en)

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NL666603707A NL147225B (nl) 1966-03-22 1966-03-22 Inrichting bevattende ten minste een als rolmembraan uitgevoerde afdichting.

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US (1) US3547005A (enrdf_load_stackoverflow)
BE (1) BE695860A (enrdf_load_stackoverflow)
CH (1) CH469213A (enrdf_load_stackoverflow)
DE (1) DE1550050C3 (enrdf_load_stackoverflow)
DK (1) DK121413B (enrdf_load_stackoverflow)
ES (1) ES338248A1 (enrdf_load_stackoverflow)
GB (1) GB1183602A (enrdf_load_stackoverflow)
NL (1) NL147225B (enrdf_load_stackoverflow)
NO (1) NO117820B (enrdf_load_stackoverflow)
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662654A (en) * 1970-01-08 1972-05-16 Philips Corp Reciprocating rod and sleeve assembly with a liquid-supported rolling diaphragm seal and a pumping ring
US3667348A (en) * 1969-04-17 1972-06-06 Philips Corp Seals between coaxial elements
US3667349A (en) * 1970-08-24 1972-06-06 Philips Corp Seal for piston-cylinder assembly
US4036112A (en) * 1974-07-02 1977-07-19 Motoren-Werke Mannheim Ag Rolling diaphragm sealing devices
US4856414A (en) * 1984-04-24 1989-08-15 Upravlenie po Montazhu, Demontazhu i Remontu Gornoshakhtnogo Oborudovania "Spetsshakhtomontazh" Karagandinskogo Proizvodstvennogo Obiedinenie po Dobyche Uglya "Karagandaugol" Viscoelastoplastic-sealant packed flexible power transmission cable for hydraulic actuator
EP0999420A3 (en) * 1998-11-02 2002-02-06 SANYO ELECTRIC Co., Ltd. Stirling device
US20080012236A1 (en) * 2006-07-11 2008-01-17 Declan Reilly Packing case seal
CN106401791A (zh) * 2016-12-16 2017-02-15 江苏源之翼电气有限公司 高效冷却发动机缸体
CN111058965A (zh) * 2019-11-18 2020-04-24 上海厚酷科技有限公司 一种制冷机间隙密封结构
US20240117803A1 (en) * 2022-10-06 2024-04-11 Cinco Research Corporation Reciprocating pump with reservoir for collecting and controlling working fluid level without the use of piston seals

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802605A1 (de) * 1988-01-29 1989-08-10 Eickhoff Geb Abdichtung fuer schnellaufende hochdruckkolbenpumpen
DE4036961A1 (de) * 1990-11-20 1992-05-21 Knorr Bremse Ag Kombinierter betriebsbrems- und federspeicherbremszylinder fuer fahrzeuge
CN111946486B (zh) * 2020-07-07 2021-04-09 北京工业大学 一种无泵自压缩有机朗肯循环发动机

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3667348A (en) * 1969-04-17 1972-06-06 Philips Corp Seals between coaxial elements
US3662654A (en) * 1970-01-08 1972-05-16 Philips Corp Reciprocating rod and sleeve assembly with a liquid-supported rolling diaphragm seal and a pumping ring
US3667349A (en) * 1970-08-24 1972-06-06 Philips Corp Seal for piston-cylinder assembly
US4036112A (en) * 1974-07-02 1977-07-19 Motoren-Werke Mannheim Ag Rolling diaphragm sealing devices
US4856414A (en) * 1984-04-24 1989-08-15 Upravlenie po Montazhu, Demontazhu i Remontu Gornoshakhtnogo Oborudovania "Spetsshakhtomontazh" Karagandinskogo Proizvodstvennogo Obiedinenie po Dobyche Uglya "Karagandaugol" Viscoelastoplastic-sealant packed flexible power transmission cable for hydraulic actuator
EP0999420A3 (en) * 1998-11-02 2002-02-06 SANYO ELECTRIC Co., Ltd. Stirling device
US20080012236A1 (en) * 2006-07-11 2008-01-17 Declan Reilly Packing case seal
CN106401791A (zh) * 2016-12-16 2017-02-15 江苏源之翼电气有限公司 高效冷却发动机缸体
CN106401791B (zh) * 2016-12-16 2018-05-22 源之翼智能装备制造（江苏）有限公司 冷却发动机缸体
CN111058965A (zh) * 2019-11-18 2020-04-24 上海厚酷科技有限公司 一种制冷机间隙密封结构
US20240117803A1 (en) * 2022-10-06 2024-04-11 Cinco Research Corporation Reciprocating pump with reservoir for collecting and controlling working fluid level without the use of piston seals

Also Published As

Publication number Publication date
NL147225B (nl) 1975-09-15
BE695860A (enrdf_load_stackoverflow) 1967-09-21
GB1183602A (en) 1970-03-11
DE1550050A1 (de) 1969-11-06
DE1550050B2 (de) 1974-08-22
NL6603707A (enrdf_load_stackoverflow) 1967-09-25
DE1550050C3 (de) 1975-05-07
DK121413B (da) 1971-10-11
SE328956B (enrdf_load_stackoverflow) 1970-09-28
CH469213A (de) 1969-02-28
ES338248A1 (es) 1968-04-01
NO117820B (enrdf_load_stackoverflow) 1969-09-29

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