US3487751A - Rolling diaphragm seal means for removing and recovering diffused gas - Google Patents

Rolling diaphragm seal means for removing and recovering diffused gas Download PDF

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Publication number
US3487751A
US3487751A US732492A US3487751DA US3487751A US 3487751 A US3487751 A US 3487751A US 732492 A US732492 A US 732492A US 3487751D A US3487751D A US 3487751DA US 3487751 A US3487751 A US 3487751A
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United States
Prior art keywords
liquid
space
gas
rolling diaphragm
pressure
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Expired - Lifetime
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US732492A
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English (en)
Inventor
Roelf Jan Meijer
Henricus Cornelis Jo Beukering
Herman Fokker
Albert August Dros
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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
    • 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

Definitions

  • the device includes a means for maintaining a pressure differential across the diaphragm seal and a liquid storage chamber.
  • the device also makes use of wire gauzes as a separator in a liquid container.
  • the invention relates to a device constituting a seal constructed as a rolling diaphragm between two coaxially arranged elements which are movable relative to one another, the said seal separating two spaces, one of the said spaces being filled with a liquid and the other space being filled with a gas.
  • Examples of known devices of the type to which the present invention relates are hot-gas reciprocating engines, compressors and expansion machines.
  • the rolling diaphragm is provided as a seal between the piston and the cylinder and forms with its one side part of the boundary of the working space. With its other side the rolling diaphragm engages liquid which serves as a support for the rolling diaphragm. It is desirable in these cases that the said liquid is at least substantially incompressible.
  • a principle object of the invention is to provide a solution to the above described problem in which the concentration of dissolved gas in the liquid space remains 3,487,751 Patented Jan. 6, 1970 below the saturation concentration and the gas diffused by the rolling diaphragm is not lost.
  • the device according to the invention is characterized in that it includes a separator to remove and receive gas diffused through the rolling diaphragm out of the liquid.
  • the gas separated out of the liquid can subsequently be supplied again to the working space.
  • One embodiment of the device according to the invention comprises a separator that is formed by at least part of the wall of the space which contains the liquid, which part of the wall is manufactured from a material which permits diffusion of the gas concerned, the said part of the wall making a boundary with its side remote from the liquid space a storage container in which a pressure prevails which is lower than the pressure in the liquid space.
  • the gas diffused from the working space through the rolling diaphragm will then leave the liquid space through the said part of the wall.
  • the end in view, namely recovery of diffused medium is achieved with an extremely simple construction.
  • the part of the wall which permits diffusion may be constituted by a second rolling diaphragm which faces the liquid space with its concave side.
  • a further embodiment of the device in which at least one liquid supply duct and at least one liquid exhaust duct communicate with the liquid space, comprises a separator which is constituted by a container consisting of at least two parts, the parts being separated from one another by a wall permitting diffusion of the gas concerned, the liquid exhaust duct communicating with the first part of the container which is provided with a further duct which communicates, if required, through a control mechanism with the supply duct to the liquid space.
  • a pumping device is further provided for transporting liquid out of the first part of the container back to the liquid space and a pressure prevails in the second part of the container which is lower than the pressure in the first part of the container.
  • liquid is always circulated by pumping, in which the pump need overcome only the resistance to flow of the ducts in question.
  • the pump need overcome only the resistance to flow of the ducts in question.
  • Another embodiment of the device according to the invention which meets the above described requirement comprises a further duct which communicates the first part of the container with its other end and opens into a liquid storage container which communicates, through a control mechanism, with the liquid space and in which a pressure prevails that is higher than the pressure in the liquid space below the rolling diaphragm.
  • a certain buffer store of liquid is formed from which liquid can be transported to the liquid space below the rolling diaphragm when the pressure level in the working space varies.
  • the space on the side of the rolling diaphragm remote from the liquid space contains hydrogen gas, the part of the wall permitting diffusion is manufactured from palladium.
  • a further embodiment of the device according to the invention comprises a structure in which the ends of the liquid exhaust duct and liquid supply duct remote from the liquid space open into a liquid storage container 1n which at least on an average a lower pressure prevails than in the liquid space below the rolling diaphragm, the opening of the said liquid supply duct in the storage container being separated from the opening of the liquid exhaust duct in the said container by one or more wire gauzes.
  • the gas dissolved in the liquid will separate in bubble form. Before the liquid is returned to the liquid space, however, it must pass the Wire gauzes, the gas bubbles appearing in the wire gauze and escaping out of the liquid along the wire gauze.
  • Another embodiment of the device according to the invention in which the rolling diaphragm engages the liquid with its concave side comprises a structure in which a pressure prevails in the storage container which at least substantially corresponds to the average pressure which prevails in the space on the side of the rolling diaphragm remote from the liquid space, a control valve being provided in the liquid exhaust duct and a pumping device being provided in the liquid supply duct.
  • a higher pressure will prevail in the liquid space than in the space on the other side of the rolling diaphragm.
  • the liquid from that space will be reduced in pressure when it passes the control valve, the diffused gas being released in bubble form.
  • a pressure prevails in the storage container which is at least substantially equal to the minimum pressure occurring in the space on the side of the rolling diaphragm remote from the liquid space, a control valve being arranged in the liquid exhaust duct and a pumping device being provided in the liquid supply duct.
  • the device means are provided to bring the liquid in the first part of the container or in the storage container in which the wire gauzes are arranged at a temperature and/or pressure such that the saturation concentration of the gas in question in the liquid concerned is lower than the saturation concentration associated with the temperature and pressure which prevails in the liquid space below the rolling diaphragm.
  • the device comprises one or more heating elements which can heat the liquid in the first part of the container or in the storage container provided with wire gauzes. As a result of the said heating the saturation concentration decreases which means that more gas escapes out of the liquid in bubble form so that a cleaner liquid is supplied to the liquid space.
  • FIG. 1 diagrammatically shows a piston-cylinder combination in which a rollingdiaphragm is used as a seal and in which part of the wall of the liquid space below the rolling diaphragm is manufactured from a material which permits diffusion of gas.
  • FIGS. 2 and 3 show diagrammatically two piston-cylinder combinations in which a rolling diaphragm is used as a seal and in which further means are provided for circulating liquid from the liquid space below the rolling diaphragm along a separator consisting of two containers separated by a wall permitting diffusion of gas.
  • FIGS. 4 and 5 show diagrammatically two piston-cylinder combinations in which a rolling diaphragm is used as a seal and in which further a liquid storage container with wire gauzes is provided for separating and receiving gas diffused through the rolling diaphragm.
  • reference numeral 1 denotes a cylinder in which a piston 2 reciprocates.
  • the piston 2 is connected through a piston rod 3 to a driving mechanism (not shown).
  • the seal between the piston and the cylinder is formed by a rolling diaphragm 4 which with its one side also bounds a working space 5 and with its other side engages liquid contained in a space 6.
  • the space 6 has a constant volume when the piston 2 moves in the cylinder. This means that a differential pressure across the rolling diaphragm 4 which is once adjusted is thereby maintained.
  • the rolling diaphragm 4 is manufactured from a flexible substance, for example a polyurethane rubber.
  • This substance in general permits a certain diffusion of the gas in the working space 5 to the working space 6.
  • the gas diffused through the rolling diaphragm will dissolve in the liquid until the saturation concentration is reached. Then the gas will appear as bubbles in the liquid.
  • a part 8 of the walls of the space 6 is manufactured from a material which permits diffusion of the gas in question.
  • This part of the wall may be manufactured from the same material as the rolling diaphragm.
  • the part of the wall may be manufactured, for example from palladium.
  • the part 8 of the wall forms a boundary with its side remote from the space 6 of a container 10. This container cornmunicates, through a duct 12 and a check valve 14 arranged therein, with the working space 5. This means that in the container 10 at most the minimum pressure can prevail which occurs in the working space.
  • FIG. 2 again shows a piston-cylinder combination as shown in FIG. 1.
  • the corresponding components have like reference numerals.
  • the walls of the liquid space 6, however, in this case are manufactured from a material which permits no diffusion.
  • the liquid space 6 communicates with a liquid exhaust duct 15 which, with its other end communicates with a part 16 of a container 17.
  • the container 17 is separated into the parts 16 and 19 by a partition 18 permitting diffusion.
  • the part 16 again communicates with the liquid space 6 through a further duct 20 which includes a pump and a control device 21.
  • the control device 21 comprises three spaces 22, 23 and 24.
  • the space 22 communicates through a narrow duct with the working space 5 so that in that space the same average pressure prevails as in the working space.
  • the space 23 also communicates through a narrow duct with the liquid space 6 so that in that space the same average pressure prevails as in the liquid space 8.
  • the spaces 22 and 23 are separated from one another by a diaphragm 25 to which the valve spindle of a valve 26 is connected.
  • a pressure spring 27 is provided in order to maintain a given diiferential pressure between the spaces 5 and 6 and 22 and 23 respectively.
  • the device further comprises an additional liquid pump 29 which supplies liquid to the space 6 through a duct 30.
  • an additional liquid pump 29 which supplies liquid to the space 6 through a duct 30.
  • the space 16 includes a heating element 32 which heats the liquid in that space. As a result of the heating of the liquid the saturation concentration of the gas in question in the liquid will become lower as a result of which more gas will diffuse through the partition 18. The liquid flows back to the liquid space 6 out of the space 16 through duct 20. As a result of the seal between the piston 2 and the cylinder 1, some liquid may leak away under conditions out of the space 6 into the sump.
  • the liquid pump 29 supplies liquid to the space 6 to compensate for the leak losses.
  • the pump 29 will supply more liquid than has leaked away.
  • the excess liquid has to be conducted away again since otherwise the dillerential pressure across the rolling diaphragm 4 may vary.
  • a control device 21 is provided in order to ensure a constant differential pressure across the rolling diaphragm 4 .
  • the diaphragm 25 will show a deflection upwards, as a result of which the valve 26 is lifted and liquid can flow back to the sump out of the space 24 through the duct 33.
  • FIG. 3 shows the same piston-cylinder combination as disclosed in FIG. 2.
  • a storage container 35 is provided in the duct 20 between the space 16 and the control device 21.
  • the said storage container communicates through a narrow duct 46 with the working space 5 so that the average pressure of the working space 5 will prevail in the storage container 35.
  • the liquid and the gas are separated from one another by a light-weight piston-shaped body 36 which permits no diffusion.
  • the operating condition of the said piston-shaped body 36 is determined by an exhaust 37.
  • the storage container contains a comparatively large quantity of liquid which enables the pressure level in the device to vary comparatively rapidly Without the rolling diaphragm 4 being adversely influenced by it.
  • FIG. 4 shows a piston-cylinder combination in which the rolling diaphragm 4 serves as a seal facing the workmg space 5 with its convex side.
  • a liquid exhaust duct 40 which includes a control device 21 communicates with the liquid space.
  • the said control device is similar to the control device shown in FIGS. 2 and 3 as faras structure and operation are concerned, with the understanding that in this embodiment the spring 27 is constructed as a tension spring as a result of the fact that the rolling diaphragm faces the working space with its convex side.
  • the result of this arrangement is that the average liquid pressure in the spaces 6 and 23 now is higher by a certain amount than the average pressure prevailing in the working space.
  • the duct 40 communicates with a liquid container 41 through a control valve.
  • the vapor space of the said container communicates through a narrow duct with the working space 5 so that in that container the average pressure prevails which prevails in the working space 5.
  • One or more walls 42 of wire gauze are arranged in the container 41.
  • the container further comprises a liquid exhaust duct 43 which opens inside the wall of wire gauze 42.
  • the exhaust duct 43 includes a pump 44 which brings the liquid to the pressure prevailing in the space 6. Therefore the liquid is circulated by pumping of the pump 44. In this case a reduction in pressure occurs across the valve 26 from the average liquid pressure to the average gas pressure. Gas, if any, dissolved in the liquid will separate.
  • a heating element 32 is included in the liquid container.
  • FIG. 5 shows a device which corresponds to the device shown in FIG. 4.
  • the rolling diaphragm 4 faces the working space 5 with its concave side.
  • the minimum pressure which occurs in the working space 5 prevails in the container 41.
  • the liquid is reduced in pressure across the valve 26 which entails a reduction of the saturation concentration.
  • a further reduction of the saturation concentration is obtained by raising the liquid to a higher temperature. In this manner a great quantity of the gas in the liquid is separated with extremely simple means.
  • the liquid which is directed back to the liquid space only contains so little gas that there exists no danger for surpassing the saturation concentration associated with the pressure and temperature prevailing in the space 6.
  • Apparatus comprising:
  • a separator in communication with said liquid and including means for separating said dissolved gas from the liquid, said separator comprising (a) a container,
  • said supply duct comprising a first part interconnecting said third space of the separator and an inlet to said liquid space of the control means and a sec- 7 8 0nd part interconnecting an outlet of 'said liquid let, a storage chamber outlet arid a control means space and said first space, and inlet, and a control means outlet and a first space
  • a valve operatively connected to said diaphragm inlet.
  • Apparatus as defined in claim 1 wherein said means 3 3 11/1960 De Rosset 5516 for maintaining the pressure difierential across the seal 3,193,988 7/ 1965 Kudlaty 92 79 X includes a control device comprising: 3,204,858 9/ 1965 f 230-49 a reservoir for the liquid, and 3,277,795 10/1966 kletdllk 9284 a liquid storage chamber including therein a piston for separating liquid below and gas above the piston, the la MARTIN SCHWADRON Pnmary Exammer gas being in communication with said second space, IRWIN c, COHEN, A i t E i and the liquid in communication with the reservoir, said supply duct having three parts respectively inter- US. Cl. X.R.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Jet Pumps And Other Pumps (AREA)
US732492A 1965-01-14 1968-05-21 Rolling diaphragm seal means for removing and recovering diffused gas Expired - Lifetime US3487751A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6500403A NL6500403A (ko) 1965-01-14 1965-01-14

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US732492A Expired - Lifetime US3487751A (en) 1965-01-14 1968-05-21 Rolling diaphragm seal means for removing and recovering diffused gas

Country Status (9)

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US (1) US3487751A (ko)
AT (1) AT261325B (ko)
BE (1) BE675031A (ko)
CH (1) CH445220A (ko)
DE (1) DE1525493C3 (ko)
DK (1) DK118540B (ko)
ES (1) ES321649A1 (ko)
GB (1) GB1138948A (ko)
NL (1) NL6500403A (ko)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795087A (en) * 1970-08-03 1974-03-05 Tokyo Shibaura Electric Co Removal of hydrogen from liquid sodium
US3865015A (en) * 1972-05-12 1975-02-11 United Stirling Ab & Co Sealing means for the piston rod of a stirling engine
US4197512A (en) * 1976-10-14 1980-04-08 Societe Anonyme Dite: Compagnie Industrielle Des Lasers Device for cooling a laser head
US4770675A (en) * 1987-01-12 1988-09-13 University Of Florida System and method for separating gases of differing masses by enhanced diffusion produced by tuned oscillations
US4950315A (en) * 1989-07-14 1990-08-21 A/G Technology Corporation Multiple head pumping
US5749942A (en) * 1997-02-14 1998-05-12 Raychem Corporation Apparatus for extracting a gas from a liquid and delivering the gas to a collection station
US5871566A (en) * 1994-11-09 1999-02-16 Lang Apparatebau Gmbh Vented metering pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3128539C2 (de) * 1981-07-18 1983-12-01 Effbe-Werk Fritz Brumme Gmbh & Co Kg, 6096 Raunheim Rollschlauchdichtung für axial bewegliche Zylinderelemente
DE3901071A1 (de) * 1989-01-16 1990-08-02 Uraca Pumpen Kolbenpumpe
DE19546113A1 (de) * 1995-12-11 1997-07-03 Siegfried Dipl Ing Kuebler Doppeltwirkender Rollmembranzylinder
AT521270B1 (de) * 2018-06-05 2019-12-15 Engel Austria Gmbh Abdichtvorrichtung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1174631A (en) * 1914-09-17 1916-03-07 Walter O Snelling Apparatus for separating gases.
US2635620A (en) * 1951-02-07 1953-04-21 Bendix Aviat Corp Automatic air bleed valve
US2824620A (en) * 1955-09-12 1958-02-25 Universal Oil Prod Co Purification of hydrogen utilizing hydrogen-permeable membranes
US2830859A (en) * 1955-01-24 1958-04-15 John B Parsons Air bleeding piston
US2958391A (en) * 1958-02-24 1960-11-01 Universal Oil Prod Co Purification of hydrogen utilizing hydrogen-permeable membranes
US3193988A (en) * 1962-01-08 1965-07-13 Flick Reedy Corp Device for removing a gas from a liquid
US3204858A (en) * 1962-07-10 1965-09-07 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal
US3277795A (en) * 1963-10-25 1966-10-11 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1174631A (en) * 1914-09-17 1916-03-07 Walter O Snelling Apparatus for separating gases.
US2635620A (en) * 1951-02-07 1953-04-21 Bendix Aviat Corp Automatic air bleed valve
US2830859A (en) * 1955-01-24 1958-04-15 John B Parsons Air bleeding piston
US2824620A (en) * 1955-09-12 1958-02-25 Universal Oil Prod Co Purification of hydrogen utilizing hydrogen-permeable membranes
US2958391A (en) * 1958-02-24 1960-11-01 Universal Oil Prod Co Purification of hydrogen utilizing hydrogen-permeable membranes
US3193988A (en) * 1962-01-08 1965-07-13 Flick Reedy Corp Device for removing a gas from a liquid
US3204858A (en) * 1962-07-10 1965-09-07 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal
US3277795A (en) * 1963-10-25 1966-10-11 Philips Corp Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795087A (en) * 1970-08-03 1974-03-05 Tokyo Shibaura Electric Co Removal of hydrogen from liquid sodium
US3865015A (en) * 1972-05-12 1975-02-11 United Stirling Ab & Co Sealing means for the piston rod of a stirling engine
US4197512A (en) * 1976-10-14 1980-04-08 Societe Anonyme Dite: Compagnie Industrielle Des Lasers Device for cooling a laser head
US4770675A (en) * 1987-01-12 1988-09-13 University Of Florida System and method for separating gases of differing masses by enhanced diffusion produced by tuned oscillations
US4950315A (en) * 1989-07-14 1990-08-21 A/G Technology Corporation Multiple head pumping
US5871566A (en) * 1994-11-09 1999-02-16 Lang Apparatebau Gmbh Vented metering pump
US5749942A (en) * 1997-02-14 1998-05-12 Raychem Corporation Apparatus for extracting a gas from a liquid and delivering the gas to a collection station

Also Published As

Publication number Publication date
AT261325B (de) 1968-04-25
DE1525493B2 (de) 1974-03-07
GB1138948A (en) 1969-01-01
BE675031A (ko) 1966-07-12
DK118540B (da) 1970-08-31
DE1525493A1 (de) 1969-03-13
DE1525493C3 (de) 1974-11-28
CH445220A (de) 1967-10-15
NL6500403A (ko) 1966-07-15
ES321649A1 (es) 1966-12-16

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