DE1525493A1 - Device with at least one seal designed as a rolling membrane between two coaxially arranged elements which can be moved relative to one another - Google Patents

Description

DipL-Ing. H. ZOEPKE

Patent attorney

Munich 12 - iüdlerstrasse 87 1 5 2 5 A 9 3 PHN 644

Kte / IT

N. V. PHILIPS 'GLOFILAMPENFABRIEKEN, EINDHOVEN / HOIJLAND

"Device with at least one seal designed as a rolling membrane between two mutually movable coaxially arranged elements "

The invention relates to a device with at least one seal between two mutually movable coaxially arranged elements, which seal separates two spaces, one of which is filled with a liquid and the other with a liquid. . '

Known devices of the type to which the present invention relates are, for example, Helss gas piston machines, compressors and expansion machines. The rolling diaphragm is attached as Abdichtun \ between the piston and cylinder de · and forms a ^ AGE part of the boundary of the working Raumee. The other side is in contact with a liquid that acts as a support for the rolling membrane. It is desirable that this liquid

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is at least nearly ^ compressible.

Ks has found that in operation a certain Diffusion of "as" from the working area through the rolling membrane to the liquid occurs, This diffusion increases with increasing temperature strong too. A disadvantage of diffusion is that when there is none Measures are taken, after some time the concentration of the gas dissolved in the liquid exceeds the saturation concentration. This means that bubbling occurs, as a result of which the liquid is no longer incompressible. This has to * olge that the rolling diaphragm shows changes in length even at a constant pressure difference · This affects the service life of the rolling diaphragm.

Ks is known to occur in the blistering To counteract liquid by regularly renewing the liquid in the space under the rolling membrane. This is the roughness continuously a certain liquid flow, in which there is little or no dissolved gas, is supplied, while at the same time a the same flow of liquid, but containing a higher concentration of dissolved gas, is discharged. In this way, the Concentration of dissolved Ga3 below the saturation concentration keep. The disadvantage of this method, however, is that the The gas that has diffused through the rolling diaphragm is lost. The costs can be considerable, especially for more expensive types of gas.

The invention aims to provide a solution for the above To create problem in which the concentration of dissolved gas la Fluid space remains below the saturation concentration and that gas diffused through the rolling diaphragm is not lost

The device according to the invention is characterized by

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that it contains a separator that diffused through the rolling membrane Eliminates and collects gas from the liquid.

The gas separated from the liquid can then be recovered be fed to the work area.

An advantageous embodiment of the inventive

The device is characterized in that the separator consists of at least consists of part of the wall of the space containing the liquid, which wall part is made of a material that allows diffusion of the gas in question, this wall part with its from Liquid erauui sent open part of the limitation of a Collecting container for gas forms, in which container there is a pressure, which is lower than the pressure prevailing in the liquid space.

From the working area through the rolling diaphragm

diffused gas then leaves the liquid space through the aforementioned part again. In this way, with an extremely simple construction, the desired purpose is achieved, i.e. the lowering of the diffused By means of, achieved. Under certain circumstances, the one that allows diffusion Wall part consist of a second Hollmembran, the hollow side of which faces the liquid space.

& a further advantageous embodiment of the device according to the invention, in which at least one ^, Fluid drainage and at least one fluid line connected is characterized in that the separator of a container consisting of at least two parts is formed, whose parts are separated from one another by a wall that allows the gas in question to diffuse, with the liquid discharge on the first container11 is connected, which is connected to a further

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Line is provided, which may have a control mechanism is connected to the supply line to the liquid space, while a Pump device is provided to dispense liquid from the first container part to promote the liquid space, in the second container part there is a pressure which is lower than the pressure in the first container part

With this embodiment, 3o always becomes liquid circulated by a pump, the pump only providing the flow resistance of the lines concerned needs to be overcome. When the liquid room is designed so that its volume when moving the elements remains constant against each other, and no leakage needs further no cone device or liquid refill device to be provided. In practice, however, there is always a small amount of leakage along the piston so that liquid has to be refilled. Because the amount refilled is always greater than the leakage thus also a control device is required to ensure that the pressure difference across the rolling diaphragm does not fluctuate.

> 'hen the pressure level in the working area can be regulated, must Measures are taken to deal with rapid changes in the pressure level the amount of liquid in the liquid space under the rolling membrane rapidly to adapt

Another independent embodiment of the device according to the invention, which satisfies the mentioned condition, is thereby characterized in that the connected to the first container part The other end of the pus line into a Flüealgkeltaeaauael container that flows into There is a connection and in de «a pressure arises which is higher than the pressure

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is in the liquid space under the rolling diaphragm. That way results a certain puffy supply of liquid from which liquid transported to the fluid space under the Hollmembran, if the pressure level in the working area changes.

If there is hydrogen in the space on the side of the rolling membrane facing away from the liquid space, in a further embodiment of the device the wall part which allows diffusion or the base which allows diffusion is made of palladium. %

Another advantageous embodiment of the device according to the invention is characterized in that the liquid discharge and supply line with their facing away from the liquid space Ends open into a liquid collection container in which at least on average, the pressure is lower than in the liquid space below the rolling diaphragm, the mouth of the mentioned liquid supply line into the collecting tank through one or more oases from the mouth the liquid drainage in this container is separated.

As a result, the liquid in the collecting container under J If the pressure is lower, the uas dissolved in the liquid is separated in i'orm from bubbles. The liquid must be before is led back to the Fiüssigkeltsraun, flowing along the gauzes, whereby the uasblaeen deposit on the gauze and along the gauze escape from the liquid

A further advantageous embodiment of the device according to the invention, in which the hollow side of the membrane rests against the liquid, is characterized in that the collecting container is subject to a pressure which at least almost _{corresponds to the mean pressure (} which in space on the wall facing away from the liquid area Page ;

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the rolling diaphragm prevails, whereby In the liquid discharge a Control valve and a pumping device in the liquid feed is. In order to keep the rolling membrane stretched, the The fluid space has a higher pressure than in the space on the other side the rolling membrane. The pressure of the liquid from the latter space will be decreased when passing through the control valve, whereby the diffused Gas is released in the form of bubbles. These bubbles separate on the Gauze off and the liquid will escape. The separated gas can also be returned to the gas space.

In another advantageous embodiment of the invention Device in which the convex side of the rolling diaphragm is in contact with the liquid, there is pressure in the collecting container, which is at least almost equal to the minimum pressure in the room at the from the liquid space facing away from the rolling diaphragm occurs, wherein a Hegel valve in the liquid discharge line and a Hegel valve in the liquid feed line a pumping device are provided.

Contains another advantageous embodiment the device means to the liquid in the first container or in the collecting container in which the gauzes are arranged on a to bring such a temperature and / or such a pressure that the saturation concentration of the relevant gas in the relevant Liquid lower than that of the temperature and pressure imposed by the Liquid space prevail below the rolling diaphragm, corresponding Saturation concentration is. According to another embodiment, the device contains one or more heating elements that baw the liquid in the first container part. in the collecting container provided with gauze can heat up. As a result of this warming, the saturation consistency decreases

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starting, which means that the gas is in the form of bubbles from the liquid escapes, leaving the liquid space a "cleaner" liquid is fed.

The invention is explained in more detail below with reference to the drawing.

In Fig. 1 is a schematic and not to scale Piston-cylinder combination shown in which a seal is used Roll ^ embransbdichtung is used and in part of the Wall of the liquid space below the rolling diaphragm made of one material is made that allows gas diffusion.

In Figures 2 and 3, two piston-cylinder combinations are shown schematically and not to scale, in which as Sealing also a rolling membrane seal is used ' and where further means are available to remove fluid from the To circulate the liquid space below the rolling membrane by a separator, which consists of two containers separated from one another by a wall allowing gas diffusion.

Figures 4 and 5 are schematic and not to scale two piston-cylinder combinations are shown, in which a rolling diaphragm seal is used as a seal and in which further a liquid collecting container with gauzes attached to it for separating and collecting the through the rolling membrane diffused gas is present.

In Figure 1, 1 denotes a cylinder in which a piston is movable. The piston 2 is via a connecting rod 3 with a not-shown engine connected. The seal between the Piston and the cylinder consists of a RoI! Membrane 41 with a

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Page forms part of the boundary of a work area 5, and with the other side θ is applied to a liquid contained in a space. As a result, - that the piston 2 and the cylinder 1 are stepped are formed, the space 6 has a constant volume when the piston 2 is moved. This means that a once set Pressure difference across the Kollmembran 4 is maintained. The rolling membrane 4 is made of a flexible material, e.g. a ίο ljrur ethane rubber, manufactured. This substance generally allows a certain diffusion of the gas in the working space 5 to the space 6. The gas diffused through the rolling membrane is in the Liquid dissolved until saturation concentration is reached · Then The gas shows up in the form of bubbles in the liquid · This has the disadvantage that the liquid is more or less compressible is, so that when the pressure in the working space 5 fluctuates, the rolling diaphragm Has changes in length.

to increase the appearance of gas bubbles in the liquid To prevent this, a part θ of the walls of the space 6 is made of a material which facilitates diffusion of the gases in question. This wall part can optionally be made of the same material as the Roll diaphragm be made. When there is hydrogen in the work area is located, the 'end part' .B. be made of palladium. The wall part 8 forms a side facing away from its rom Rc.um 6 Part of the boundary of a container 10 · But this container is standing a · line 12 in which a check valve 14 was installed did old the work space 5 in connection * Dl · · means that in the container 10 at most the minimum pressure that occurs in the work area, hwrrsohwn can. Now when gas passes through the rolling diaphragm 4 into the air-conditioning room

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is diffused in, it diffuses due to the higher pressure than the pressure in the container θ Ib mean in the bar 6 through the wall part θ to the container 10. From this container 10 the gas can be returned to the working space 5. In this Heise is achieved with surprisingly simple means that in the liquid gas bubbles form "recovered the diffused gas while also.

FIG. 2 shows a piston-cylinder combination similar to that in FIG. Corresponding parts are denoted with the same reference: 3 digits. In this embodiment, however, the walls of the liquid space 6 are made entirely of a material that does not allow diffusion. To the liquid chamber 6 but Fiüssifjkeitsableitung _f 15 is connected the other end to a reservoir 17 is connected. The container 17 is divided into parts 16 and 19 by a wall 1Θ allowing gas diffusion. The part 16 is connected again to the liquid space 6 by a further line 20 in which a pump and a control device 21 are attached.

The Hegel device 21 contains three rooms 22, 2 'and The space 22 is connected to the working space 5 by a narrow line, so that the same mean pressure in this space the same as in the work room. The space 23 is also connected to the liquid space 6 by a narrow line, so that in the same mean pressure prevails in this space as in the liquid space 6. The houses 22 and 23 are separated from one another by a membrane 25 separated, with which the shaft of a valve 26 is connected. Around a certain pressure difference between the spaces 5 and 6 or 22 and

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To maintain, a compression spring 27 is provided.

The device also contains a second liquid pump 29, which feeds liquid to the fluff 6 via a line 50 can.

As a result of the effectiveness of the liquid pump in the line 20 liquid flows from the space 6 to part 16 of the container

Because a pressure is maintained in the space 19 which is lower than the liquid pressure, any diffuses in the Liquid in the space 16 allowing gas through the gas diffusion Wall 18 to room 19. The gas diffused to room 19 can pass through the line 31 are discharged. Io room 16 is also a heating element 32 available, which heat the liquid in this space can. By heating the liquid, the saturation concentration becomes de3 gas in question in the liquid is lower, whereby more gas diffused through the wall 18. The flows from room 16 Liquid through line 20 back to the liquid space 6. By the seal between the piston 2 and the Cylinder 1 can under certain circumstances leak some liquid from space 6 to the crankcase. The liquid pump 29 leads to the Room 6 liquid to compensate for the leakage losses. In practice, the pump 29 supplies more liquid than is lured away. The excess of supplied liquid must be drained off again, because otherwise the pressure difference across the rolling diaphragm 4 can change ·. To ensure a constant pressure difference across the rolling diaphragm 4, the control device 21 is provided. When the pressure in the fluids Room 6 is higher than the desired pressure difference corresponds, bends the membrane 23 passes upwards, whereby the valve 26 is raised

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and ^ liquid from the space 24 through the line 34 to the crankcase back Hesse know

In this way it is achieved again that the liquid in the space 6 remains inappropriately compressible, while that through the rolling membrane diffused gas is not lost.

Fig. 3 shows a similar piston-cylinder combination like Fig. 2. The only difference is that in this embodiment in the line 20 between the bar 16 and the control device 21 a storage vessel 33 is attached. That Yor Rate is up through a close line with the work area 5 terbunden, so that in Storage vessel J5 the mean pressure prevails in the working area 5 occurs. The liquid and gas are through in the storage vessel a light, piston-shaped body that does not allow Casdiffusion 36 separated from each other. The operating position of this piston-shaped body 56 Ton an outlet 37 is determined. There is one in the storage vessel relatively large amount of liquid available, which makes it possible to change the pressure level in the door direction relatively quickly, without the rolling membrane 4 being damaged as a result.

Fig. 4 shows a piston-cylinder combination in which serving as a seal roll membrane 4 to the working space 5 the facing convex side. At the liquid space 6 there is a liquid drain 40 connected, in which a control device 21 is added. This control device is the same in terms of their roughness and Operation of the control devices shown in FIGS. 2 and 3 with the measure that Now due to the fact that the rolling diaphragm its convex side faces the working space, the spring 27 is designed as a tension spring. As a result, the middle liquid *

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keitsdruck in the rooms 6 and 23 by a certain amount higher than the mean pressure prevailing in the work room. The line 49 is connected to the liquid container 41 via the control valve. The steam space of this container ;: is connected to the working area S ~ by a narrow line, so that the mean pressure prevailing in the working area prevails in this container. One or more gauze walls 42 are arranged in the container 4I. The container also has a liquid ^{drainage line 431 ′ * i e} which opens within the gauze wall or walls. In the derivative 43 is a P _v ump 44 'which causes the liquid to the pressure prevailing in the pressure üaura 6. The liquid is circulated by the pump 44. In this case, a pressure decrease occurs above the valve 26, from the mean liquid pressure to the mean gas pressure. Any gas dissolved in the liquid separates from bubbles in Forra. These bubbles remain in the liquid container when the gauze flows through it and rise to the top. In this way they get back into the working space. In order to lower the saturation and concentration, a heating element 32 is also provided in the liquid container.

FIG. 5 shows a device corresponding to the device according to FIG. In this embodiment, the Hollmembran 4 turns to the working space 5, however, its hollow side. To obtain ^ ine pressure differential across the valve 26, prevails in the container 4 "* <* ^βΓ ^ indestdruck that occurs in the work area. 5 This is dadurch- ersielbar that the vapor space above a line with an integrated check valve ait the working chamber 5 and au -c'i is connected to a refill container in which the child gas pressure prevails. This ensures that the liquid above the valve 26 experiences a pressure pressure, which is a

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Brings lowering of the saturation concentration with it. Another A decrease in the saturation concentration results here as well, that the liquid is brought to a higher temperature. on This way, with extremely simple means, a large amount of the in the liquid located gas deposited. The liquid that is returned to the liquid space contains so little gas that no risk of the pressure prevailing in space 6 being exceeded and the saturation concentration corresponding to the temperature prevailing in this room is present.

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Claims (10)

1. Device with at least one designed as a Hollmembran Sealing between two mutually movable coaxially arranged elements, which sealing separates two spaces from which one is filled with a liquid and the other with a gas, characterized in that the device contains a separator to remove any gas that has diffused through the rolling membrane from the To remove and collect liquid. 2. Device according to claim 1, characterized in that the separator from at least a part of the wall of the room containing the Contains liquid, which> V and part consists of a material is made that allows diffusion of the gas in question, this * and part with its facing away from the fluid space Side forms part of the boundary of a waste container, in in which container there is a pressure that is lower than that in the liquid s space is the prevailing pressure. Device according to claim 1, in which at least one liquid discharge line and at least one liquid supply line are connected to the liquid space, characterized in that the separator is formed by a container consisting of at least two parts, the parts of which are formed by a diffusion of the case in question. 'and are separated from each other, the liquid discharge line being connected to the first container part, which is provided with a further line which, if necessary via a control mechanism _{t, is connected} to the supply line to the liquid space, while a pumping device is seen to dispense liquid from the first To reclaim the container part to «the liquid room, with im Ö09811 / 0993 second container part there is a pressure that is lower than the la the first part of the container is the prevailing pressure. 4 · gate direction rrach claim 3t characterized in that the other line connected to the first part of the container on the other End opens into a liquid collection container, which is controlled by a control mechanism ait is in communication with the liquid space and into the the pressure is higher than the pressure in the liquid space 5. Apparatus according to claim 2 _t 3 or 4, in which hydrogen gas is located in the space on the side of the rolling membrane facing away from the liquid space, characterized in that the wall part permitting gas diffusion or the diffusion permitting ^ and is made of palladium. 6. Gate direction according to claim 1, in which the liquid roughness a liquid drainage and a liquid supply line connected are, characterized in that the liquid drainage and the Liquid supply line with the ttaden turned away from the liquid space Open into a liquid collecting container in which there is at least on average a lower pressure than in the liquid space below the Rolling membrane, the mouth of the mentioned liquid supply line in the collecting container through one or more gauzes from the mouth of the Liquid drainage is separated in this container. 7. Gate direction according to claim 6, in which the hollow side ah of the liquid rests on the rolling membrane, characterized in that there is a pressure in the collecting container which at least almost corresponds to the mean pressure that comes in the room to the side of the rolling membrane facing away from the liquid space, wherein in the Flüssigkeitaableitung a control valve and in the Plüasigkeitszuleitung a pumping _c BATH ORIGINAL 909811/0993 device are available. 8. Apparatus according to claim u, wherein the rolling membrane with the convex side lies against the liquid, characterized in that that there is a pressure in the collecting tank that is at least almost the same is the minimum pressure in the space facing away from the liquid space Side of the Kollmembran occurs, being in the fluid drainage a control valve and a pumping device in the liquid supply line are" 9. Device according to one or more of the preceding claims, characterized in that the device contains means around the liquid in the first container part or in the Sanmelbehäler in which the gauzes are arranged to such a temperature and / or a to bring such pressure that the saturation concentration the The gas in question in the liquid in question is lower than the temperature and pressure in the liquid space below the Rolling membrane prevail, the corresponding saturation concentration is. 10. Device na <; h claim 9, characterized in that one or more heating elements are provided which heat the liquid in the first container part or in the collecting container twisted with gauze can. 909811/0993