NL2023608B1 - Seal comprising two folds for a gap between a cylinder and a piston - Google Patents

Seal comprising two folds for a gap between a cylinder and a piston Download PDF

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Publication number
NL2023608B1
NL2023608B1 NL2023608A NL2023608A NL2023608B1 NL 2023608 B1 NL2023608 B1 NL 2023608B1 NL 2023608 A NL2023608 A NL 2023608A NL 2023608 A NL2023608 A NL 2023608A NL 2023608 B1 NL2023608 B1 NL 2023608B1
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NL
Netherlands
Prior art keywords
sheet
cylinder
seal
piston
flexible material
Prior art date
Application number
NL2023608A
Other languages
Dutch (nl)
Inventor
Ernest Gardner Fred
Vriesema Bauke
Original Assignee
Blue Heart Energy B V
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Filing date
Publication date
Application filed by Blue Heart Energy B V filed Critical Blue Heart Energy B V
Priority to NL2023608A priority Critical patent/NL2023608B1/en
Application granted granted Critical
Publication of NL2023608B1 publication Critical patent/NL2023608B1/en

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Classifications

    • 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
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
    • 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
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • 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
    • F16J15/00—Sealings
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • 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
    • F16J15/00—Sealings
    • F16J15/56—Other sealings for reciprocating rods

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Fluid Mechanics (AREA)
  • Sealing Devices (AREA)

Abstract

The invention relates to a substantially annular seal for sealing a substantially annular gap between a cylinder and a piston, in which the piston is movable in the axial direction of the cylinder, the seal comprising two rolling membranes, each formed by a sheet of flexible material, with the folds of the rolling membranes directed away from each other, the two rolling membranes enclosing an annular chamber filled with a fluid. The provision of two membranes with opposite configurations maintains the low friction of the membrane, while the two juxtaposed membranes make the seal suited to withstand pressure differences. The invention also provides a combination of a cylinder and a piston, the piston being sealed relative to the cylinder by as above, a thermo-acoustic heat pump, comprising a cylinder and a piston as above and a method of installing a seal between a cylinder and a piston as above.

Description

Seal comprising two folds for a gap between a cylinder and a piston The present invention relates to a substantially annular seal for sealing an annular gap between a cylinder and a piston, in which the piston is movable in the direction of the axis of the cylinder.
Such seals find application in combustion engines and cylinder pumps. Often piston rings are used as seals in these applications.
Further so called rolling membranes are used as seals between pistons and cylinders. The advantage of these rolling membranes over piston rings is that the rolling membranes are less subject to friction and wear. Hence prior art discloses a substantially annular seal for sealing an annular gap between a cylinder and a piston, in which the piston is movable in the direction of the axis of the cylinder, the seal comprising at least one rolling membrane formed by a sheet of flexible material.
A problem with this rolling membrane is that the membrane is not adapted to withstand substantial pressure differences, making it unsuitable for applications such as combustion engines and pumps.
An aim of the invention is to provide a seal which substantially reduces friction between the cylinder and the piston relative to piston rings, and which is nevertheless able to withstand substantial pressure differences between both sides of the seal.
This aim is reached by a seal of the kind referred to above in which the seal comprises two rolling membranes, each formed by a sheet of flexible material, with the folds of the rolling membranes directed away from each other, that the two rolling membranes enclose an annular chamber and that the chamber has been filled with a fluid.
The provision of two membranes with opposite configurations, maintains the low friction of the rolling membrane. Further the two juxtaposed rolling membranes make the seal better suited to withstand pressure differences.
The invention also concerns a combination of a cylinder and a piston movable in the axial direction of the cylinder, wherein the piston is sealed relative to the cylinder by a seal of the kind referred to above.
Finally the invention provides a method for installing a seal between a cylinder and a piston movable in the cylinder in the axial direction of the cylinder, the method comprising the steps of providing a single sheet of flexible material having a cylindrical structure, applying two cylindrical folds in the sheet of flexible material, arranging the sheet of flexible material circumventing the piston and applying a combination of the piston and the folded sheet of flexible material in the cylinder. To make the seal better suited for withstanding pressure differences at either side of the piston, it is advisable that the pressure prevailing in in the fluid in the chamber is higher than the pressure difference for which the seal is dimensioned. A secondary advantage of this feature is that the seal works a centring device centring the piston in the cylinder.
A simple embodiment provides the feature that the chamber is filled with water. This implies that the materials from which the sheets forming the seal is made, must be able to withstand the water, so that these materials must not be prone to corrosion. Preferably the seal is made from materials like stainless steel, plastics or rubber.
A further simplification is achieved when both rolling membranes are together formed by a single sheet of flexible material, having a cylindrical structure and having two cylindrical folds. The use of a single sheet of flexible material makes production of the seal simpler and further enhances the sealing of the chamber formed by the sheet of flexible material.
Preferably the edges of the sheet are closed by an outer circumferential seam, leading to a further simplification of the structure of the seal and increase of quality of the sealing of the chamber. Another advantage is that the chamber is easy accessible when the seal has been arranged around the piston.
To facilitate an easy closure of the seam, it is preferred that the edges of the sheet of flexible material comprises radial sections at both sides of the outer circumferential seam. This embodiment also provides a combination of a cylinder and a piston movable in the axial direction of the cylinder, wherein the cylinder comprises two sections separated by a circumferential gap and that radial sections of the sheet of flexible material forming the seal extend through said circumferential gap. This embodiment provides also a method as claimed in claim, wherein the combination of the piston and the folded sheet of flexible material is applied in the cylinder by the steps of applying a combination of the piston and the sheet of flexible material on a first section of the cylinder, with radial sections of the sheet of flexible material forming the seal extending over a radial plane of the first cylinder section, applying a second section of the cylinder over the radial section of the sheets of flexible material forming the seal, so that the seal extends through a circumferential gap between the first and the second cylinder section, fixing the mutual position of the first and the second cylinder section and applying a fluid in a chamber enclosed by the sheet of flexible material.
Preferably a pressure is applied to the fluid in the chamber, in which the pressure is higher than the pressure difference between the either side of the seal. Another preferred embodiment provides the feature that a ring is located in the outer circumferential seam of the sheet of flexible material.
To allow an easy closure of the seal, it is preferred that the sheet of flexible material comprises thickened strips at its outer edges. This embodiment also provides a combination of a cylinder and a piston movable in the axial direction of the cylinder wherein thickened strips at both outer edges of the sheet of flexible material forming the seal are located outside the gap between the cylinder sections. For better positioning the seal relative to the piston the sheet of flexible material preferably comprises a thickened strip at an inner circumferential face of the sheet. This embodiment also provides a combination of a cylinder and a piston movable in the axial direction of the cylinder wherein the piston comprises an outer circumferential slot in a radial plane and that the sheet of flexible material forming the seal comprises a thickened strip at an inner circumferential face of the sheet, which thickened strip extends at least partially in the slot. The advantages of the invention appear more clearly when the ratio between the diameter of the piston and the diameter of the cylinder ranges between 0,90 and 0,98. The vertical arrangement of the cylindrical axis leads to a symmetrical arrangement of the forces and pressures in the combination, allowing the seal to perform its centering function at its best. Although other materials are not excluded, it is preferred that the sheet of flexible material is a rubber sheet.
A particularly attractive embodiment provides the feature that the sheet of flexible material is made of an anisotropic material, in which the strength in the axial and radial direction of the sheet of flexible material is greater than the strength in its tangential direction.
According to yet another embodiment, the sheet of flexible material is reinforced with at least one group of elongated members extending mutually parallel. A special embodiment provides the feature that the seal comprises at least two groups of elongated members extending mutually parallel within any group. it is preferred that the elongated members in a group extend in the axial and radial direction of the sheet of flexible material and in the axial and radial direction of the sheet of flexible material respectively.
Preferably the elongated members extend over the full size of the sheet of flexible material in the axial and radial direction.
The advantages of the invention appear particularly well when the combination of the kind referred to above forms part of a thermo-acoustic heat pump, wherein the piston is sealed relative to the cylinder by a seal of the kind referred to above. 5 Subsequently the present invention will be discussed with the help of the following drawings, in which depict: Figure 1 ‚a cross-sectional view of a combination of a cylinder and a piston sealed by a seal according to the invention; Figure 2A ‚a cross-sectional view of a combination of a cylinder and a piston sealed by a seal according to another embodiment in a first position; Figure 2B : a cross-sectional view similar to figure 1A, but in another position of the piston relative to the cylinder; Figure 3 ‚a partial cross-sectional view of an alternative, simple embodiment; Figure 4 : a partial cross-sectional view of a further embodiment; Figure 5 : a partial cross-sectional view of yet another embodiment; Figure 5 ‚a cross-sectional view of a seal of the embodiment of figure 3; Figure 7 : a perspective view of a series of re-enforcement members for a seal according to the invention; and Figure 8 ‚a view similar to that of figure 6, of re-enforcement members according to another embodiment. The invention relates to a seal between a cylinder and a piston movable in the cylinder in the axial direction thereof. Such a situation is depicted in figure 1 showing a cylinder 1, a piston 2 and an annular seal 6. The seal comprises a cylindrical sheet 7 of flexible material such as rubber. An intermediate section 7a of the sheet 7 is extends adjacent to the piston 2, which section is bordered by two folds 7b, 7c, and two peripheral sections 7d, 7e, of the sheet extend substantially parallel to the intermediate section thereof. A chamber 8 is enclosed by the sheet of flexible material 7 and a fluid under pressure is present in the chamber 8.
The intermediate section 7a of the sheet 7 extending parallel to the outer wall of the piston 2 moves with the piston and the peripheral sections 7d, 7e of the sheet 7 extending parallel to the cylinder 1 are connected to the cylinder 1. The seal 6 allows an axial movement of the piston 2 relative to the cylinder 1, to allow the piston 2 to perform its function in a pump or combustion engine of which it forms a part. In the situation depicted in figure 2A the cylinder 1 is composed of two cylinder sections 1a and 1b, which are separated by a seam 3 and which are mutually connected by rivets 4 or any other suitable means of connection such as screws. The rivets 4 or screws extend between annular protrusions 5 of the cylinder sections 1a and 1b, in which apertures have been provided for the screws or rivets
4. However other means of connection are not excluded. Just as in the embodiment depicted in figure 1, the seal is formed by an cylindrical sheet 7 of flexible material such as rubber. A seam between outer edges of the peripheral sections 7d, 7e of the flexible sheet is closed.
The two figures 2A and 2B of the drawings show different positions of the piston 2 relative to the cylinder 1. The seal is active between the two sides of the piston 2, in which the maximum allowable pressure difference over the piston 2 and the seal 6 equals that of the pressure prevailing in the chamber 8 . Further the seal has a centering effect on the piston 1 relative to the cylinder 2.
Figure 3 depicts a cross section of only one side of the seal according to the invention. This figure shows, just as figure 1 a piston 2, a cylinder 1, which comprises two cylinder sections 1a and 1b which are adjacent, contrary to the situation depicted in figure 1. However a groove 10 is present in the cylinder section 1b. It may also be that the groove is present in the other section 14, or in both sections 1a, 1b, the grooves then forming a single groove 10. This embodiment does not comprise any Also in this embodiment a seal 6 is present, which is substantially the same as the seal 6 described in connection with figure 1. However a difference resides in the fact that the flexible sheet 7, forming a major part of the seal comprises two radial sections 11a, 11b at their edges. These radial sections 11a, 11b extend in the groove 10 in the inner cylinder wall 1, thus fixing the edges of the flexible sheet 7 relative to the cylinder 1.
Figure 4 depicts a cross section similar to that of figure 2, but of an embodiment similar to that of figure 1. This embodiment comprises two cylinder halves 1a. 1b, having annular protrusions 5, connected with rivets 4 or screws. Contrary to figure
1, in figure 3, a pipe 20 is present between the two radial sections 11a, 11b of the sheet 7, the pipe 10 connecting the chamber 8 with the environment. This pipe 20 is used for entering fluid into the chamber 8 and for the application of a pressure in the chamber 8, after which the pipe 20 is removed or closed.
Further this embodiment deviates from the embodiments shown in the figures 1 and 2 by the provision of a thickened rim 21 in the middle of the intermediate section 7a of the sheet 7. This thickened rim extends in a groove 22 provided in the piston 2 and providing mutual fixation of the sheet 7 of the seal relative to the piston
2.
Figure 5 shows a cross-sectional view of one side of a sheet 7, before it is applied to a combination of a piston 2 and a cylinder 1. The version of the sheet 7 depicted in figure 4 is the version shown in figure1, 3 applied between the piston 2 and the cylinder 1. The figure clearly shows the folded structure of the flexible sheet 7, which comprises the intermediate section 7a separated by the two folds 7b, 7c from the extreme sections 7d, 7e of the sheet. Further this figure shows the thickened rim 21 in the middle of the intermediate section 7a, and the radial sections 11a, 11b of the sheet 7 at the edges of the sheet. Finally thickened strips 23a, 23b at the edges of the radial sections 11a, 11b are visible. It is noted that the angle of the folds 7b, 7c deviates from 180°, but the flexible character of the sheet 7 allows to adapt the angle of the folds 7b, 7c to the required 180° when installed between the piston 2 and the cylinder 1.
An embodiment deviating from the embodiments discussed before is shown in figure 6. This embodiment comprises two flexible, cylindrical sheets 27, 28, contrary to the earlier embodiments, which comprise a single sheet 7 only. The two flexible sheets 27, 28 each comprise a fold 27a, 28a respectively wherein both folds 27a, 28a have an opposite direction. Both sheets 27, 28 are connected with the piston 2 and with the cylinder 1, so that a closed chamber 29 is formed, just as in the preceding embodiments. To make a connection with the piston 2 or with the cylinder 1, both edges of each of the sheets 27, 28 comprises radial sections 30, 31 respectively, which extends into grooves 32, 33 provided in the piston 2, the cylinder 1 respectively. A fluid, such as a liquid, like water is present in the chamber 29, just as in the preceding embodiments, wherein the fluid preferably is under pressure. To be able to supply the fluid to the chamber 29 a pipe 34 extends through the cylinder 1 between the chamber 29 and the outside world or the environment. Of course this pipe 34 can be closed off to avoid leaking away of the liquid, and to maintain the pressure of the fluid if such a pressure is present.
According to a preferred embodiment, the flexible sheet is provided of linear re- enforcements extending substantially in the axial direction of the cylindrical sheet. These re-enforcements take the shape of fibres 40, which may be formed of metal or carbon, although other materials are not excluded, and Figure 7 shows a structure of a series of such linear re-enforcements 40, which all extend mutually parallel. The re-enforcements 40 are integrated into the sheet, such as moulded into the sheet, glued to the sheet 7, or woven into the sheet. Apart from general enforcement of the sheet, the re-enforcements 40 also add in the centering function of the piston relative to the cylinder, caused by the relative stiffness of the re- enforcements, and hence the resistance to bending in the folds.
An alternative embodiment of re-enforcements is depicted in figure 8. The re- enforcements in this embodiment comprises two groups of mutual parallel extending re-enforcements 40, 41, of which a first group 40 extends parallel to the axial direction, like in figure 6, but wherein a second group 41 of re-enforcements extends under an angle relative to the axis of the cylindrical sheet 7, but mutually parallel. Also these re-enforcements serve the general strength and add in the centering of the piston.
The preceding embodiments serve only for illustrating the present invention, wherein features of different embodiments may be combined. However the scope of the invention is only to be determined by the claims.

Claims (25)

ConclusiesConclusions 1. Hoofdzakelijk ringvormige afdichting voor een hoofdzakelijk ringvormige spleet tussen een cilinder en een zuiger, waarbij de zuiger beweegbaar is in de axiale richting van de cilinder, waarbij de afdichting tenminste een door een vel flexibel materiaal gevormd rolmembraan omvat, met het kenmerk dat de afdichting twee elk door een vel flexibel materiaal gevormde rolmembranen omvat, waarbij de vouwen van de rolmembranen van elkaar af zijn gericht, dat de twee rolmembranen een ringvormige kamer omsluiten en dat de kamer met een fluïdum is gevuld.A substantially annular seal for a substantially annular gap between a cylinder and a piston, the piston being movable in the axial direction of the cylinder, the seal comprising at least one rolling diaphragm formed by a sheet of flexible material, characterized in that the seal comprises two rolling membranes each formed by a sheet of flexible material, the folds of the rolling membranes facing away from each other, the two rolling membranes enclosing an annular chamber and the chamber being filled with a fluid. 2. Afdichting volgens conclusie 1, met het kenmerk, dat de in de kamer heersende druk hoger is dan het drukverschil waarvoor de afdichting is gedimensioneerd.A seal according to claim 1, characterized in that the pressure prevailing in the chamber is higher than the pressure difference for which the seal is dimensioned. 3. Afdichting volgens conclusie 1 of 2, met het kenmerk, dat de kamer met een vloeistof, zoals water, is gevuld.Seal according to claim 1 or 2, characterized in that the chamber is filled with a liquid, such as water. 4. Afdichting volgens conclusie 1, 2 of 3, met het kenmerk, dat beide rolmembranen tezamen door een enkel vel van flexibel materiaal worden gevormd, waarbij het vel een cilindrische structuur heeft en is voorzien van twee ringvormige vouwen.A seal according to claim 1, 2 or 3, characterized in that both rolling membranes are formed together by a single sheet of flexible material, the sheet having a cylindrical structure and having two annular folds. 5. Afdichting volgens conclusie 4, met het kenmerk, dat de randen van het vel flexibel materiaal met elkaar zijn verbonden door een buitenste omtreknaad.Seal according to claim 4, characterized in that the edges of the sheet of flexible material are joined together by an outer circumferential seam. 6. Afdichting volgens conclusie 5, met het kenmerk, dat de randen van het vel flexibel materiaal aan beide zijden van de buitenste omtreknaad radiale delen omvatten.Seal according to claim 5, characterized in that the edges of the sheet of flexible material comprise radial portions on both sides of the outer circumferential seam. 7. Afdichting volgens conclusie 6, met het kenmerk, dat in de buitenste omtreknaad een ring is geplaatst.Seal according to claim 6, characterized in that a ring is placed in the outer circumferential seam. 8. Afdichting volgens conclusie 6 of 7, met het kenmerk, dat het vel flexibel materiaal aan zijn buitenranden verdikte stroken omvat.Seal according to claim 6 or 7, characterized in that the sheet of flexible material comprises strips thickened on its outer edges. 9. Afdichting volgens één van de voorafgaande conclusies, met het kenmerk, dat het vel flexibel materiaal aan een inwendig omtrekviak een verdikte strook omvat.A seal according to any one of the preceding claims, characterized in that the sheet of flexible material comprises a thickened strip on an inner peripheral surface. 10. Afdichting volgens één van de voorafgaande conclusies, met het kenmerk, dat het vel flexibel materiaal door een rubberen vel wordt gevormd.Seal according to any one of the preceding claims, characterized in that the sheet of flexible material is formed by a rubber sheet. 11. Afdichting volgens één van de voorafgaande conclusies, met het kenmerk, dat het vel flexibel materiaal door een anisotroop materiaal wordt gevormd, waarvan de sterkte in de axiale en radiale richting van het vel groter is dan de sterkte in de tangentiële richting.Seal according to any one of the preceding claims, characterized in that the sheet of flexible material is formed by an anisotropic material, the strength of which in the axial and radial direction of the sheet is greater than the strength in the tangential direction. 12. Afdichting volgens conclusie 11, met het kenmerk, dat het vel flexibel materiaal is versterkt met tenminste één groep langwerpige elementen die zich elk onderling parallel uitstrekken.12. A seal according to claim 11, characterized in that the sheet of flexible material is reinforced with at least one group of elongated elements each extending in parallel with each other. 13. Afdichting volgens conclusie 12, met het kenmerk, dat het vel flexibel! materiaal versterkt is met twee groepen langwerpige elementen, die zich binnen een groep wederzijds parallel uitstrekken en dat de langwerpige elementen van verschillende groepen zich onder scherpe of rechte hoeken uitstrekken.13. A seal according to claim 12, characterized in that the sheet is flexible! material is reinforced with two groups of elongated elements extending mutually parallel within a group and the elongated elements of different groups extending at sharp or right angles. 14. Afdichting volgens conclusie 12 of 13, met het kenmerk, dat de langwerpige elementen van verschillende groepen zich in de axiale, respectievelijk radiale richting uitstrekken.Seal according to claim 12 or 13, characterized in that the elongated elements of different groups extend in the axial and radial direction, respectively. 15. Afdichting volgens conclusie 12, 13 of 14, met het kenmerk, dat de langwerpige elementen zich over de volle lengte van het vel flexibel materiaal in de axiale dan wel radiale richting uitstrekken.A seal according to claim 12, 13 or 14, characterized in that the elongated elements extend the full length of the sheet of flexible material in the axial or radial direction. 16. Combinatie van een cilinder en een in de axiale richting van de cilinder beweegbare zuiger, met het kenmerk, dat de zuiger ten opzichte van de cilinder is afgedicht door een afdichting volgens één van de conclusies 1-15.Combination of a cylinder and a piston movable in the axial direction of the cylinder, characterized in that the piston is sealed with respect to the cylinder by a seal according to any one of claims 1-15. 17. Combinatie volgens conclusie 16, met het kenmerk, dat de cilinder twee delen omvat, die worden gescheiden door een omtrekspleet en dat de radiale delen van het de afdichting vormende vel flexibel materiaal zich in de omtrekspleet uitstekken.17. A combination according to claim 16, characterized in that the cylinder comprises two parts which are separated by a circumferential gap and that the radial parts of the sheet of flexible material forming the seal extend into the circumferential gap. 18. Combinatie volgens conclusie 16, met het kenmerk, dat verdikte stroken aan beide buitenranden van het de afdichting vormende vel buiten de spleet tussen de cilinderdelen zijn geplaatst.18. A combination according to claim 16, characterized in that thickened strips on both outer edges of the sheet forming the seal are placed outside the gap between the cylinder parts. 19. Combinatie volgens conclusie 16, 17 of 18, met het kenmerk, dat de zuiger in een radiaal vlak een zich aan de omtrek uitstrekkende sleuf omvat en het de afdichting vormende vel bij een inwendige omtrekvlak van het vel een verdikte strook omvat, die zich tenminste gedeeltelijk in de sleuf uitstrekt.19. A combination according to claim 16, 17 or 18, characterized in that the piston comprises in a radial plane a circumferentially extending slot and the seal-forming sheet comprises a thickened strip at an inner circumferential surface of the sheet, which extends at least partially into the trench. 20. Combinatie volgens één van de conclusies 16-19, met het kenmerk, dat de verhouding tussen de diameter van de zuiger en de diameter van de cilinder ligt in het gebied tussen 0,9 en 0,98.Combination according to any one of claims 16-19, characterized in that the ratio between the diameter of the piston and the diameter of the cylinder is in the range between 0.9 and 0.98. 21. Combinatie volgens één van de conclusies 18-20, met het kenmerk, dat de as van de cilinder zich hoofdzakelijk in verticale richting uitstrekt.21. A combination according to any one of claims 18-20, characterized in that the axis of the cylinder extends mainly in the vertical direction. 22. Thermo-akoestische warmtepomp, omvattende een cilinder en een in de axiale richting van de cilinder beweegbare zuiger, met het kenmerk, dat de zuiger ten opzichte van de cilinder is afgedicht door een afdichting volgens één van de conclusies 1-15.22. Thermo-acoustic heat pump, comprising a cylinder and a piston movable in the axial direction of the cylinder, characterized in that the piston is sealed with respect to the cylinder by a seal according to any one of claims 1-15. 23. Werkwijze voor het plaatsen van een afdichting tussen een cilinder en een in de axiale richting van de cilinder beweegbare zuiger, gekenmerkt door de volgende stappen: - het verschaffen van een enkel vel flexibel materiaal met een cilindrische structuur; - het aanbrengen van twee cilindrische vouwen in het vel flexibel materiaal; - het rondom de zuiger aanbrengen van de het vel flexibel materiaal; en - het in de cilinder aanbrengen van de combinatie van de zuiger en het gevouwen vel flexibel materiaal.23. A method for placing a seal between a cylinder and a piston movable in the axial direction of the cylinder, characterized by the following steps: - providing a single sheet of flexible material with a cylindrical structure; - arranging two cylindrical folds in the sheet of flexible material; - arranging the sheet of flexible material around the piston; and - arranging the combination of the piston and the folded sheet of flexible material in the cylinder. 24. Werkwijze volgens conclusie 23, met het kenmerk, dat de combinatie van de zuiger en het gevouwen vel flexibel materiaal in de cilinder wordt aangebracht door: - het op een eerste deel van de cilinder aanbrengen van een combinatie van de zuiger en het gevouwen vel flexibel materiaal, waarbij radiale delen van het de afdichting vormende vel flexibel materiaal zich over een radiaal vlak van het eerste cilinderdeel uitstrekt; - het aanbrengen van een tweede deel van de cilinder op het radiale deel van het de afdichting vormende vel flexibel materiaal, zo dat de afdichting zich uitstrekt in een omtrekspleet tussen het eerste en tweede cilinderdeel; - het bevestigen van de onderlinge positie van het eerste en het tweede cilinderdeel; en - het aanbrengen van een fluïdum in de kamer, die wordt gevormd door het vel flexibel materiaal.A method according to claim 23, characterized in that the combination of the piston and the folded sheet of flexible material is arranged in the cylinder by: - applying a combination of the piston and the folded sheet to a first part of the cylinder flexible material, with radial portions of the seal forming sheet of flexible material extending over a radial plane of the first cylinder portion; - applying a second part of the cylinder to the radial part of the sheet of flexible material forming the seal, such that the seal extends in a circumferential gap between the first and second cylinder parts; - confirming the relative position of the first and the second cylinder part; and - applying a fluid in the chamber, which is formed by the sheet of flexible material. 25. Werkwijze volgens conclusie 23 en 24, met het kenmerk, dat op het fluidum in de kamer een druk wordt aangelegd, die groter is dan het drukverschil tussen beide zijden van de afdichting.25. A method according to claims 23 and 24, characterized in that a pressure is applied to the fluid in the chamber which is greater than the pressure difference between both sides of the seal.
NL2023608A 2019-08-05 2019-08-05 Seal comprising two folds for a gap between a cylinder and a piston NL2023608B1 (en)

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