EP0262364B1 - Security inlay for low-boiling liquefied gas-storage vessels - Google Patents
Security inlay for low-boiling liquefied gas-storage vessels Download PDFInfo
- Publication number
- EP0262364B1 EP0262364B1 EP19870111881 EP87111881A EP0262364B1 EP 0262364 B1 EP0262364 B1 EP 0262364B1 EP 19870111881 EP19870111881 EP 19870111881 EP 87111881 A EP87111881 A EP 87111881A EP 0262364 B1 EP0262364 B1 EP 0262364B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- neck
- safety
- shrinkdown
- safety insert
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000009835 boiling Methods 0.000 title claims description 5
- 239000007789 gas Substances 0.000 claims description 9
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000001307 helium Substances 0.000 description 3
- 229910052734 helium Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000251730 Chondrichthyes Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/014—Suspension means
- F17C2203/018—Suspension means by attachment at the neck
Definitions
- the invention relates to a safety insert for vessels for storing low-boiling liquefied gases according to the preamble of claim 1.
- Vessels for storing low-boiling liquefied gases that have a neck-shaped opening for filling and removal, for example helium cans, are provided with a safety insert.
- This consists essentially of a safety neck tube which is arranged in the vascular shark in such a way that an annular space is formed between the neck and the safety neck tube. The liquid is filled and removed through an opening in the safety neck tube.
- a safety valve is also attached to the safety neck tube.
- the annular space is connected to the exhaust pipe for the removal of vaporized gas.
- the use of the safety neck tube prevents the filling and removal opening from becoming blocked by freezing out water and carbon dioxide after air ingress.
- the exhaust pipe is an annular space in which the gas column therein tends to form taconis vibrations when the exhaust valve is open and closed. These are mechanical-thermal vibrations of a gas column, which cause a strong evaporation of the liquid. In order to avoid these vibrations, it is proposed according to EP-A 170 142 to arrange means for forming a helical flow channel in the annular space.
- a spiral glued onto the safety neck tube a design of the safety neck tube as a blow molded or injection molded part with an embossed spiral and a screw-shaped corrugated hose as a safety neck tube.
- the workload and the manufacturing costs for the first two versions are high.
- the corrugated hose has so far not found any practical application and offers no possibility of changing the cross section of the flow channel in the direction of flow.
- the safety neck tube as a plastic blowing part can only be produced with sufficient length with extreme difficulty.
- the required length of the Sichefieitshalsrohres entails that in the plasticized state of the preform, its weight becomes so great that the preform tears off at the upper molding opening.
- the invention has for its object to provide a safety insert for vessels for storing low-boiling liquefied gases, the manufacturing costs are low.
- the use of a shrink tube which can be produced with a simple tool in a helical shape in the desired length and diameter, significantly reduces the tooling and manufacturing costs.
- the lengths of the shrink tubing can be chosen as desired without problems.
- the vessel 1 shows a vessel for storing liquid helium 4 consisting of an inner container 1 and an outer container 2.
- An insulation 3 is located between the inner container 1 and the outer container 2.
- the vessel neck 5 leads from the opening 8 of the inner container 1 to the outside and ends in a flange 6.
- the flange 19 of the neck insert head 7 is connected to the flange 6.
- the shrink tube 21 is also connected to the flange 6, specifically via a centering flange 22. The three flanges are pressed against one another by means of a clamping bracket 20.
- the neck insert head In its extension to the outside, the neck insert head contains a lifting valve 9 for filling and removal. In addition, a safety valve 10 and a manometer 11 are connected to the neck insert head 7. The end of the neck 5 is connected to the exhaust pipe 12, in which a safety valve 13, a shut-off valve 14 and a check valve 15 are arranged.
- the shrink tube 21 is of helical design and its outer diameter lies against the inner wall of the neck 5 of the vessel. Due to the screw pitch, a helical channel 23 is formed, which is connected to the exhaust pipe 12. The direction of flow is indicated by arrows 18.
- the shrink tube 21 consists of a cold-resistant polyolefin or PTFE. It is pre-stretched, namely only uniaxially, radially and is therefore under tension.
- the uniaxial stretching has the advantage that there are no tensile stresses in the longitudinal direction and therefore thread-like flanks can be realized during the shrinking process.
- the selected material has the further advantage that it is no longer possible for the corrugated hose to be glued or wedged to the vessel wall by means of ice particles. It has been shown that the surfaces of these materials have no adhesiveness and, due to the elasticity of the shrink tube, the tube gives in even when it is cold when wedging begins.
- the hose is pulled over a helical tool and heated with hot air.
- the tube retracts to approximately its diameter before stretching.
- the shrink tube takes the exact shape of the helical tool total.
- the shrink tube 21 shown in FIG. 2 is obtained by simply twisting it off.
- the shrink tube 21 is attached to the neck insert head 7 via the centering flange 22. This is shrunk onto the outlet end 25 during manufacture of the helical shrink tube. It is important that suitable measures ensure that the flange is securely and tightly seated in the hose.
- the particular advantage of the shrink tube compared to the prior art is that, due to the flexibility of the tube, deviations in the squareness of the three flanges - 6, 19, 22 - connection can be compensated.
- care must be taken to ensure that the flange surfaces are exactly parallel to each other, since with small deviations due to the addition of the defects at the outlet end of the pipe, deflections of several millimeters occur very quickly, which lead to the pipe breaking.
- the helical channel 23 offers good protection against the occurrence of mechanical-thermal Taconis vibrations.
- An improvement is achieved according to EP-A 170 142 in that the helix has an increasing gradient in the direction of flow.
- the screw shape of the channel 23 increases in depth 16 to the outlet 17.
- Another embodiment consists in increasing the flank angle of the screw thread 24 towards the outlet 17. In both cases, the turning off of the finished shrink tube is not hindered by the tool.
- the flank angle of the screw thread 24 is at least 120 ° . It has been shown in the tests that at lower flank angles, the forces that lead to shrinkage are compensated for by the deformation forces.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
Die Erfindung betrifft einen Sicherheitseinsatz für Gefäße zum Aufbewahren tiefsiedender verflüssigter Gase nach dem Oberbegriff des Anspruches 1.The invention relates to a safety insert for vessels for storing low-boiling liquefied gases according to the preamble of claim 1.
Gefäße zum Aufbewahren tiefsiedender verflüssigter Gase, die eine halsförmige Öffnung zur Füllung und Entnahme besitzen, beispielsweise Heliumkannen, werden mit einem Sicherheitseinsatz versehen. Dieser besteht im wesentlichen aus einem Sicherheitshalsrohr, welches so im Gefäßhais angeordnet wird, daß sich zwischen Gefäßhals und Sicherheitshalsrohr ein Ringraum ausbildet. Durch eine Öffnung im Sicherheitshalsrohr erfolgt die Füllung und Entnahme der Flüssigkeit. Am Sicherheitshalsrohr ist ferner ein Sicherheitsventil angebracht. Der Ringraum steht mit der Abgasleitung zur Entnahme verdampften Gases in Verbindung.Vessels for storing low-boiling liquefied gases that have a neck-shaped opening for filling and removal, for example helium cans, are provided with a safety insert. This consists essentially of a safety neck tube which is arranged in the vascular shark in such a way that an annular space is formed between the neck and the safety neck tube. The liquid is filled and removed through an opening in the safety neck tube. A safety valve is also attached to the safety neck tube. The annular space is connected to the exhaust pipe for the removal of vaporized gas.
Der Einsatz des Sicherheitshalsrohres verhindert ein Verstopfen der Füll- und Entnahmeöffnung durch Ausfrieren von Wasser und Kohlendioxid nach Lufteinbrüchen.The use of the safety neck tube prevents the filling and removal opening from becoming blocked by freezing out water and carbon dioxide after air ingress.
Die Abgasleitung ist ein Ringraum, in welchem die darin befindliche Gassäule bei geöffnetem und geschlossenem Abgasventil dazu neigt, Taconis-schwingungen auszubilden. Dies sind mechanischthermische Schwingungen einer Gassäule, durch welche eine starke Verdampfung der Flüssigkeit verursacht wird. Zur Vermeidung dieser Schwingungen wird gemäß EP-A 170 142 vorgeschlagen, im Ringraum Mittel zur Ausbildung eines wendelförmigen Strömungskanals anzuordnen.The exhaust pipe is an annular space in which the gas column therein tends to form taconis vibrations when the exhaust valve is open and closed. These are mechanical-thermal vibrations of a gas column, which cause a strong evaporation of the liquid. In order to avoid these vibrations, it is proposed according to EP-A 170 142 to arrange means for forming a helical flow channel in the annular space.
Als Mittel werden genannt:The following are mentioned as means:
Eine auf das Sicherheitshalsrohr aufgeklebte Wendel, eine Ausbildung des Sicherheitshalsrohres als Blasform- oder Spritzgußteil mit aufgeprägter Wendel und ein schraubenförmiger Wellschlauch als Sicherheitshalsrohr.A spiral glued onto the safety neck tube, a design of the safety neck tube as a blow molded or injection molded part with an embossed spiral and a screw-shaped corrugated hose as a safety neck tube.
Der Arbeitsaufwand bzw. die Herstellkosten für die beiden erstgenannten Ausführungen sind hoch. Der Wellschlauch hat bisher keine praktische Anwendung gefunden und bietet keine Möglichkeit, den Querschnitt des Strömungskanals in Strömungsrichtung zu verändern.The workload and the manufacturing costs for the first two versions are high. The corrugated hose has so far not found any practical application and offers no possibility of changing the cross section of the flow channel in the direction of flow.
Das Sicherheitshalsrohr kann als Kunststoff-Blasteil nur äußerst schwierig in ausreichender Länge hergestellt werden.The safety neck tube as a plastic blowing part can only be produced with sufficient length with extreme difficulty.
Die erforderliche Länge des Sichefieitshalsrohres bringt es mit sich, daß im plastifizierten Zustand des Vorformlings sein Gewicht so groß wird, daß der Vorformling an der oberen Formteilöffnung abreißt.The required length of the Sichefieitshalsrohres entails that in the plasticized state of the preform, its weight becomes so great that the preform tears off at the upper molding opening.
Der Erfindung liegt die Aufgabe zugrunde, einen Sicherheitseinsatz für Gefäße zum Aufbewahren tiefsiedender verflüssigter Gase zu schaffen, dessen Herstellkosten gering sind.The invention has for its object to provide a safety insert for vessels for storing low-boiling liquefied gases, the manufacturing costs are low.
Ausgehend von dem im Oberbegriff des Anspruches 1 berücksichtigten Stand der Technik ist diese Aufgabe erfindungsgemäß gelöst mit den im kennzeichnenden Teil des Anspruches 1 angegebenen Merkmalen.Starting from the prior art considered in the preamble of claim 1, this object is achieved according to the invention with the features specified in the characterizing part of claim 1.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.
Durch die Verwendung eines Schrumpfschlauches, der mit einem einfachen Werkzeug schraubenförmig in gewünschter Länge und Durchmesser hergestellt werden kann, werden die Werkzeug-und Herstellkosten wesentlich reduziert. Die Längen des Schrumpfschlauches können beliebig gewählt werden, ohne daß Probleme auftreten.The use of a shrink tube, which can be produced with a simple tool in a helical shape in the desired length and diameter, significantly reduces the tooling and manufacturing costs. The lengths of the shrink tubing can be chosen as desired without problems.
Ein Ausführungsbeispiel der Erfindung wird anhand der Zeichnung erläutert.An embodiment of the invention is explained with reference to the drawing.
Es zeigen:
- Fig. 1 ein Gefäß zur Aufbewahrung von flüssigem Helium mit einem Sicherheitseinsatz im Schnitt:
- Fig. 2 ein als schraubenförmiger Schrumpfschlauch ausgebildetes Befüll- und Entleerrohr.
- 1 shows a vessel for storing liquid helium with a safety insert in section:
- 2 a filling and emptying tube designed as a helical shrink tube.
Fig. 1 zeigt ein aus einem Innenbehälter 1 und einem Außenbehälter 2 bestehendes Gefäß zur Aufbewahrung von flüssigem Helium 4. Zwischen Innenbehälter 1 und Außenbehälter 2 befindet sich eine Isolierung 3. Von der Öffnung 8 des Innenbehälters 1 führt der Gefäßhals 5 nach außen und endet in einem Flansch 6. Mit dem Flansch 6 verbunden ist der Flansch 19 des Halseinsatzkopfes 7. Mit dem Flansch 6 ist ferner verbunden der Schrumpfschlauch 21, und zwar über einen Zentrierflansch 22. Die drei Flansche werden mittels eines Spannbügels 20 gegeneinander gepreßt.1 shows a vessel for storing liquid helium 4 consisting of an inner container 1 and an outer container 2. An insulation 3 is located between the inner container 1 and the outer container 2. The
Der Halseinsatzkopf enthält in seiner Verlängerung nach außen ein Heberventil 9 zur Füllung und Entnahme. Außerdem ist ein Sicherheitsventil 10 und ein Manometer 11 an den Halseinsatzkopf 7 angeschlossen. Das Ende des Gefäßhalses 5 ist mit der Abgasleitung 12 verbunden, in welcher ein Sicherheitsventil 13, ein Absperrventil 14 und ein Rückschlagventil 15 angeordnet sind.In its extension to the outside, the neck insert head contains a
Der Schrumpfschlauch 21 ist schraubenförmig ausgebildet und liegt mit seinem Außendurchmesser an der Innenwand des Gefäßhalses 5 an. Aufgrund der Schraubensteigung entsteht ein wendelförmiger Kanal 23, der mit der Abgasleitung 12 in Verbindung steht. Die Strömungsrichtung ist durch Pfeile 18 angegeben.The
Der Schrumpfschlauch 21 besteht aus einem kältebeständigen Polyolefin oder PTFE. Er ist vorgereckt, und zwar nur einachsig radial und steht dadurch unter Vorspannung. Die einachsige Reckung hat den Vorteil, daß keine Zugspannungen in Längsrichtung entstehen und sich deshalb beim Schrumpfvorgang gewindeähnliche Flanken realisieren lassen. Das ausgewählte Material hat den weiteren Vorteil, daß ein Verkleben oder Verkeilen des Wellschlauchs durch Eispartikel mit der Gefäßwand nicht mehr möglich ist. Es hat sich gezeigt, daß die Oberflächen dieser Materialien keine Haftfähigkeit besitzen und durch die Elastizität des Schrumpfschlauches auch im tiefkalten Zustand ein Nachgeben des Schlauches beim Beginn einer Verkeilung eintritt.The
Zur Erzielung der schraubenförmigen Form wird der Schlauch über ein schraubenförmiges Werkzeug gezogen und mittels Heißluft erwärmt. Dabei zieht sich der Schlauch auf etwa seinen vor der Reckung vorhandenen Durchmesser zurück. Bei geeigneter Erwärmung nimmt der Schrumpfschlauch genau die Form des schraubenförmigen Werkzeuges an. Durch einfaches Abdrehen erhält man den in Fig. 2 dargestellten Schrumpfschlauch 21.To achieve the helical shape, the hose is pulled over a helical tool and heated with hot air. The tube retracts to approximately its diameter before stretching. With suitable heating, the shrink tube takes the exact shape of the helical tool total. The
Die Befestigung des Schrumpfschlauches 21 am Halseinsatzkopf 7 erfolgt über den Zentrierflansch 22. Dieser wird bei der Herstellung des schraubenförmigen Schrumpfschlauches auf dessen Austrittsende 25 aufgeschrumpft. Hierbei ist wichtig, daß durch geeignete Maßnahmen ein sicherer und dichter Sitz des Flansches im Schlauch erzielt wird.The
Der besondere Vorteil des Schrumpfschlauches gegenüber dem Stand der Technik besteht darin, daß durch Flexibilität des Schlauches Abweichungen in der Rechtwinkeligkeit der Drei-Flanschen - 6, 19, 22 - Verbindung ausgeglichen werden können. Bei Rohren aus Spritzguß oder von Blasformen muß dagegen auf genaue Planparallelität der Flanschenflächen geachtet werden, da bei geringen Abweichungen durch die Addition der Fehler am Austrittsende des Rohres sehr schnell Auslenkungen von mehreren Millimetern auftreten, die zum Bruch des Rohres führen.The particular advantage of the shrink tube compared to the prior art is that, due to the flexibility of the tube, deviations in the squareness of the three flanges - 6, 19, 22 - connection can be compensated. In the case of pipes made of injection molding or blow molds, however, care must be taken to ensure that the flange surfaces are exactly parallel to each other, since with small deviations due to the addition of the defects at the outlet end of the pipe, deflections of several millimeters occur very quickly, which lead to the pipe breaking.
Der wendelförmige Kanal 23 bietet bekanntlich einen guten Schutz gegen das Auftreten von mechanisch-thermischen Taconis-Schwingungen. Eine Verbesserung wird gemäß EP-A 170 142 dadurch erreicht, daß die Wendel im Strömungsrichtung eine zunehmende Steigung besitzt. Erfindungsgemäß wird vorgeschlagen, daß die Schraubenform des Kanales 23 zum Austritt 17 zu in ihrer Tiefe 16 zunimmt. Eine andere Ausführung besteht darin, den Flankenwinkel des Schraubengewindes 24 zum Austritt 17 hin zu vergrößern. In beiden Fällen wird das Abdrehen des fertigen Schrumpfschlauches von dem Werkzeug nicht behindert. Der Flankenwinkel des Schraubengewindes 24 beträgt mindestens 120°. Es hat sich bei den Versuchen gezeigt, daß bei geringeren Flankenwinkeln die Kräfte, die zum Schrumpfen führen, durch die Formänderungskräfte kompensiert werden.As is known, the
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863633571 DE3633571C1 (en) | 1986-10-02 | 1986-10-02 | Safety insert for vessels for storing low-boiling liquefied gases |
| DE3633571 | 1986-10-02 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0262364A2 EP0262364A2 (en) | 1988-04-06 |
| EP0262364A3 EP0262364A3 (en) | 1988-06-22 |
| EP0262364B1 true EP0262364B1 (en) | 1990-05-30 |
Family
ID=6310909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19870111881 Expired - Lifetime EP0262364B1 (en) | 1986-10-02 | 1987-08-17 | Security inlay for low-boiling liquefied gas-storage vessels |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0262364B1 (en) |
| DE (1) | DE3633571C1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19909997C1 (en) * | 1999-03-06 | 2000-08-10 | Messer Griesheim Gmbh | Container for storage of cryogenic media has raising device with inflow and outflow ends for removal of medium, with thermo-dynamic vibrations of device extensively excluded |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2018082B2 (en) * | 1970-04-15 | 1976-06-10 | Linde Ag, 6200 Wiesbaden | THERMAL INSULATED LIQUID GAS TANK |
| DE3428140C2 (en) * | 1984-07-31 | 1986-06-26 | Messer Griesheim Gmbh, 6000 Frankfurt | Safety insert for a vessel for storing low-boiling liquefied gases |
-
1986
- 1986-10-02 DE DE19863633571 patent/DE3633571C1/en not_active Expired
-
1987
- 1987-08-17 EP EP19870111881 patent/EP0262364B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0262364A3 (en) | 1988-06-22 |
| EP0262364A2 (en) | 1988-04-06 |
| DE3633571C1 (en) | 1987-10-15 |
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