EP1910727A1 - Refrigerant conduit - Google Patents
Refrigerant conduitInfo
- Publication number
- EP1910727A1 EP1910727A1 EP06776406A EP06776406A EP1910727A1 EP 1910727 A1 EP1910727 A1 EP 1910727A1 EP 06776406 A EP06776406 A EP 06776406A EP 06776406 A EP06776406 A EP 06776406A EP 1910727 A1 EP1910727 A1 EP 1910727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refrigerant pipe
- pipe according
- metal hose
- wall thickness
- troughs
- 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.)
- Withdrawn
Links
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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/14—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics
- F16L11/15—Hoses, i.e. flexible pipes made of rigid material, e.g. metal or hard plastics corrugated
Definitions
- the invention relates to a refrigerant line for use in air conditioning in particular of motor vehicles with a corrugated metal hose with radially outlying wave crests and radially inner wave troughs.
- a generic refrigerant line is known, for example, from EP-A 1 048 881, where the refrigerant line consists of a metal tube with a radially compressive flexible metal jacket surrounding it as an axial support, and a space filling the space between the metal tube and the jacket Intermediate layer made of pressure-resistant plastic.
- the present invention is now based on the object to provide a refrigerant line of the type mentioned, which still allows for improved stability, in particular to achieve a Druckpulsationsdämpfung improved flexibility.
- the metal hose of the refrigerant line has an exceptionally thin wall thickness of between 0.10 and 0.25 mm.
- the Applicant has found this wall thickness range as optimum with regard to the requirements of both compressive strength (compared to up to 180 bar) and mobility, and thus intentionally thin-walled the metal hose, as would be necessary by the required compressive strength.
- This is achieved above all by the very high corrugation and by the other dimensions of the metal tube, namely in that it has a wavelength of less than 3 mm, preferably between 1, 5 and 2.5 mm, the channels advantageously being ⁇ - are formed to obtain the largest possible number of waves per length and thus to increase the flexibility even further.
- the ⁇ profile also ensures that the inner liner does not bulge under internal pressure, ie does not deform into the wave crests, which correspondingly reduces the service life of the inner liner would.
- the inner liner is preferably made of PTFE or a PTFE composite material and has at least in some areas a wall thickness (S 3 ) in the range of between 0.1 and 1, 0 mm and in particular between 0.4 and 0.6 mm.
- the inner liner is radially spaced from the radially outer wave crests of the metal tube, so that between the inner liner and the wave crests spaced from him buffer areas for the at pressure peaks of any pressure pulsations of the refrigerant radially outwardly expanding inner liner are provided.
- the refrigerant pipe is on the one hand in their mobility not or not significantly limited, so sufficiently flexible; and on the other hand, the metal hose with the inner liner and the between arranged buffer areas for a very good pressure pulsation damping.
- the metal tube is optimized in terms of its pulsation resistance on the one hand and its mobility on the other hand that it has a greater wall thickness at least in partial areas of its wave crests than at least in partial areas of its wave troughs.
- the wall thickness of the wave peaks just lower than the wall thickness of the troughs
- a metal hose is proposed with opposite wall thickness ratios
- the thinner wall thickness of the troughs continues to provide mobility in particular in the various bending directions, while the thicker wave crests , which are primarily stressed when internal pressure pulsation occurs, are more stable and thereby not only reduce the disadvantageous changes in length, but also prevent fatigue of the metal tube in the otherwise very heavily stressed region of the wave crests.
- the metal hose of the refrigerant pipe according to the invention has a wall thickness in the range between 0.17 and 0.25 mm at least in subregions of its wave crests and at least in partial regions of its wave troughs has a wall thickness in the range between 0.10 and 0.18 mm.
- the high flexibility, for which the troughs are primarily responsible, and on the other hand, the high pressure pulsation resistance, for which in particular the area of the wave crests is decisive, are optimally ensured.
- the metal hose is suitably ring corrugated and made of austenitic or ferritic steel or aluminum or Inconel or aluminum alloys.
- the metal hose according to the invention has, over its axial length, a mobility in the three spatial axes of the order of magnitude of +/- 15 mm.
- the metal hose Due to the design of the shaft geometry according to the invention, it is possible for the metal hose to withstand pressures of up to 180 bar or pressure pulsation forces of between 5 and 180 bar, which can be achieved within the shortest possible time periods, for example within a quarter of a second. At these pressures, the metal hose according to the invention nevertheless has a permeation density of less than 1 g / year due to its material in order to be usable for CO 2 feeds.
- FIG. 1 shows an exemplary cross section of a metal hose for the refrigerant pipe according to the invention in Figure 1.
- a line section of a metal hose 1 is shown schematically in axial section with radially outlying wave crests 2 and radially inwardly lying wave crests 3.
- the ratio of D a to Di should be greater than 1, 3.
- D 1 is for example 6.2 mm and D 3 9.7 mm, for DN 8 eg Dj 8.3 mm and D a 12.3 mm.
- the wall thickness S of the metal hose is marked with S 3 in the area of the wave crests, while the wall thickness in the area of the wave troughs is marked with S 1 .
- Both wall thicknesses are according to the invention between 0.10 and 0.25 mm.
- the wall thickness in the region of the wave crests is greater than the wall thickness in the region of the wave troughs, that is to say S 3 > S 1 .
- the wavelength L w of the metal tube is indicated in the drawing, namely the distance between two axially adjacent same points, for example between two rising wave flanks, two wave crests, etc.
- This wavelength is expediently less than 3 mm and preferably between 1 , 5 and 2.5 mm, in the case of DN6 2.0 mm and in DN8 2.2 mm.
- the present invention provides a refrigerant line which nonetheless advantageously combines the conflicting requirements with regard to mobility on the one hand and pressure pulsation resistance on the other hand by virtue of the flexibility and flexibility of the metal hose of the air conditioning line having sufficient wall thickness and hence pulsation damping it has a ratio of outer diameter (D a ) of the wave crests to inner diameter (Dj) of the troughs of greater than 1, 3 and that it at least in some areas a wall thickness (S a , Si) in the range of between 0.10 and 0.25 mm.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510037166 DE102005037166A1 (en) | 2005-08-06 | 2005-08-06 | Refrigerant line |
PCT/EP2006/007347 WO2007017104A1 (en) | 2005-08-06 | 2006-07-26 | Refrigerant conduit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1910727A1 true EP1910727A1 (en) | 2008-04-16 |
Family
ID=37069162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06776406A Withdrawn EP1910727A1 (en) | 2005-08-06 | 2006-07-26 | Refrigerant conduit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1910727A1 (en) |
DE (1) | DE102005037166A1 (en) |
WO (1) | WO2007017104A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112879485B (en) * | 2020-04-27 | 2022-11-25 | 北京京西重工有限公司 | Air suspension assembly and bellows for an air suspension assembly |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1804160U (en) * | 1959-10-17 | 1960-01-14 | Kloeckner Humboldt Deutz Ag | BELLOWS. |
US5143122A (en) * | 1990-09-11 | 1992-09-01 | Bundy Corporation | Composite flexible conduit assembly |
DE19919715A1 (en) * | 1999-04-30 | 2000-11-02 | Witzenmann Metallschlauchfab | Refrigerant line for air conditioning systems |
DE19957567B4 (en) * | 1999-11-30 | 2004-04-08 | Rasmussen Gmbh | Diffusion-tight fluid line |
JP4062862B2 (en) * | 2000-06-05 | 2008-03-19 | 東海ゴム工業株式会社 | Metal composite corrugated hose and manufacturing method thereof |
JP2002005348A (en) * | 2000-06-22 | 2002-01-09 | Fujikura Ltd | Corrugated conduit tube |
JP3682213B2 (en) * | 2000-08-25 | 2005-08-10 | 小島プレス工業株式会社 | Manufacturing method of bellows-equipped duct and blow molding die therefor |
CA2497748C (en) * | 2002-09-06 | 2011-06-14 | Ork Corporation | Metal bellows tube, method of producing the same, and flexible tube for high-pressure fluid |
DE10241504A1 (en) * | 2002-09-07 | 2004-03-18 | S.M.A. Metalltechnik Gmbh & Co. Kg | Preformed hose has corrugated hose of preferably metal and against inner wall or outer wall of which bears support hose with at least partial form-locking engagement in corrugations |
DE10244107B4 (en) * | 2002-09-11 | 2004-09-02 | Senior Berghöfer GmbH | Hose line and process for its manufacture |
JP2004169824A (en) * | 2002-11-20 | 2004-06-17 | Tokai Rubber Ind Ltd | Flexible hose |
-
2005
- 2005-08-06 DE DE200510037166 patent/DE102005037166A1/en not_active Withdrawn
-
2006
- 2006-07-26 WO PCT/EP2006/007347 patent/WO2007017104A1/en active Application Filing
- 2006-07-26 EP EP06776406A patent/EP1910727A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2007017104A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007017104A1 (en) | 2007-02-15 |
DE102005037166A1 (en) | 2007-02-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20071203 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PFAFF, THOMAS Inventor name: BANTSCHEFF, RICHARD Inventor name: KARL, REINER Inventor name: ROESLER, RENE Inventor name: NOLTENIUS, CARSTEN |
|
17Q | First examination report despatched |
Effective date: 20081113 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20110201 |