EP0254759A1 - Procédé d'échange d'un piston de déplacement dans une machine frigorifique et machine frigorifique pour la mise en oeuvre du procédé - Google Patents
Procédé d'échange d'un piston de déplacement dans une machine frigorifique et machine frigorifique pour la mise en oeuvre du procédé Download PDFInfo
- Publication number
- EP0254759A1 EP0254759A1 EP86110463A EP86110463A EP0254759A1 EP 0254759 A1 EP0254759 A1 EP 0254759A1 EP 86110463 A EP86110463 A EP 86110463A EP 86110463 A EP86110463 A EP 86110463A EP 0254759 A1 EP0254759 A1 EP 0254759A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- displacer
- refrigerator
- housing
- pressure
- protective gas
- 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- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
Definitions
- the invention relates to a method for replacing the displacer of a refrigerator with a divided housing, the parts of which can be separated from one another in such a way that the displacer is accessible.
- the invention also relates to a refrigerator which is suitably designed for carrying out the method.
- Refrigerators are low-temperature chillers in which thermodynamic cycle processes take place.
- a single-stage refrigerator essentially comprises a work space with a displacer.
- the working space is alternately connected to a high-pressure and a low-pressure gas source, so that the thermodynamic cycle takes place during the forced reciprocating movement of the displacer.
- the working gas is conducted in a closed cycle. The result is that heat is extracted from a certain area of the working chamber.
- two-stage refrigerators of this type and helium as the working gas temperatures below 10 K can be generated.
- the displacer In order to avoid long interruptions in operation, it is known to change the displacer using a glovebox.
- the use of the glovebox makes it possible to change the displacer under a protective gas atmosphere. This can prevent, for example, condensable gases from entering the working or cylinder space of the displacer and condensing on areas that are still cold.
- the use of the glovebox therefore has the advantage of being able to change the displacer at still low temperatures, that is, heating up the not to have to wait for cold areas of the refrigerator and the connected device or instrument.
- the relatively expensive glovebox can only be used where there is sufficient space.
- the duration of the replacement work is still quite long (at least 2 hours).
- the reason for this is on the one hand the necessity of several purging processes associated with a relatively high shielding gas consumption in order to generate a sufficiently pure shielding gas atmosphere within the glove box.
- Another reason is the more difficult handling of the tools with the gloves of the glovebox.
- the displacer to be replaced, after being pulled out will touch the walls or gloves of the glovebox with its cold side. This results in destruction of the parts usually made of plastic films and thus contamination of the protective gas atmosphere.
- the temperature increases occurring during the replacement work are not negligible, so that start-up times are still added to the times of the direct replacement work.
- the costs associated with the high shielding gas consumption are not insignificant if helium has to be used.
- the present invention is based on the object of proposing a method of the type mentioned at the outset which enables a further, considerable reduction in the outlay associated with the replacement work.
- Displacer should also be understood to mean the displacer system of a two- or three-stage refrigerator, which consists of two or three displacer stages coupled to one another.
- the refrigerator 1 shown in the figure has a housing which consists of the two parts 2 and 3.
- the housing part 2 In the housing part 2, the cylindrical working spaces 4 and 5 for the two displacement stages 6 and 7 are accommodated.
- the upper displacement stage 6 is equipped with a drive piston 8, the associated cylinder 9 of which is accommodated in a guide bush 10 which closes off the working space 4 from the housing part 3.
- the guide bush 10 is equipped with the holes 11, 12 and 13.
- the holes 11 open into the working space 4 and serve to supply this space with working gas.
- the bore 13 opens into a transverse bore 14 which is connected to an annular groove 15 in the outer wall of the guide bush 10.
- Two further bores 12 are indicated by dash-dotted lines and serve to pneumatically drive the system consisting of the displacers 6 and 7.
- the different bores are in different planes from the plane of the drawing, so that they do not cross each other, which is indicated by the dashed or dash-dotted lines.
- control motor 16 is housed, which actuates the control valve 18 via the shaft 17.
- This control valve 18 is used in a manner known per se to supply the various bores with working gas under high pressure and under low pressure.
- the connections for the high pressure and the low pressure working gas are designated 19 and 20.
- the parting plane 21 between the housing parts 2 and 3 lies at the level of the control valve 18. It is chosen so that after the removal of the upper housing part 3 with the motor 16 and valve 18, a flat pot-shaped space 22 is present above the guide bush 10. At the level of this space 22 there is a bore 23 which penetrates the wall of the housing part 2 and connects the space 22 to the high-pressure connection 19.
- the low pressure connection 20 is connected to the bore 24 in the housing part 3, which opens into the annular groove 15 of the guide bush 10.
- the high-pressure working gas flows via the connection 19 into the chamber 22 With the help of the control valve 18 supplied the various holes. After its expansion in the refrigerator stages, the working gas reaches the bores 13, 14 and flows out via the annular groove 15 and the low-pressure connection 20.
- the pressure of the working gas at the high pressure connection 19 is usually 22 bar, while the working gas pressure at the low pressure connection 20 is approx. 7 bar.
- the replacement of the displacement system consisting of the displacers 6 and 7, takes place as follows:
- the compressor connections 19, 20 are detached from the refrigerator. They are designed in such a way that the interior of the refrigerator remains separated from the atmosphere after the connections have been released.
- a protective gas source usually a He gas bottle, is connected to the low pressure connection 20 and the high pressure connection 19 is opened. This results in a flushing flow through the bores 24, 14, 13, through the chamber 22 and through the bore 23.
- the protective gas is supplied with a slight excess pressure, for example about 1.2 bar.
- the housing part 3 is then removed and the guide bush 10 is pulled out of the housing part 2. After the removal of these two parts, the protective gas flowing in through the bore 24 flows upward over the edge of the housing part 2.
- the housing part 3 After inserting the new displacement system, which had previously been expediently flushed with helium, and the guide bushing 10, the housing part 3 is mounted while the inert gas flow is maintained. The refrigerator is then ready for use.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Separation By Low-Temperature Treatments (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86110463A EP0254759A1 (fr) | 1986-07-29 | 1986-07-29 | Procédé d'échange d'un piston de déplacement dans une machine frigorifique et machine frigorifique pour la mise en oeuvre du procédé |
US07/079,110 US4761963A (en) | 1986-07-29 | 1987-07-29 | Method of exchanging the displacement element of a refrigerator and refrigerator for implementing the method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP86110463A EP0254759A1 (fr) | 1986-07-29 | 1986-07-29 | Procédé d'échange d'un piston de déplacement dans une machine frigorifique et machine frigorifique pour la mise en oeuvre du procédé |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0254759A1 true EP0254759A1 (fr) | 1988-02-03 |
Family
ID=8195306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86110463A Withdrawn EP0254759A1 (fr) | 1986-07-29 | 1986-07-29 | Procédé d'échange d'un piston de déplacement dans une machine frigorifique et machine frigorifique pour la mise en oeuvre du procédé |
Country Status (2)
Country | Link |
---|---|
US (1) | US4761963A (fr) |
EP (1) | EP0254759A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0350290A2 (fr) * | 1988-07-07 | 1990-01-10 | The BOC Group plc | Réfrigérateurs cryogéniques |
EP0437661A1 (fr) * | 1990-01-18 | 1991-07-24 | Leybold Aktiengesellschaft | Sonde froide avec un réfrigérateur cryogénique du type Gifford-McMahon |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4906266A (en) * | 1988-12-20 | 1990-03-06 | Helix Technology Corporation | Replacement method and apparatus for a cryogenic refrigeration unit |
US4956974A (en) * | 1988-12-20 | 1990-09-18 | Helix Technology Corporation | Replacement method and apparatus for a cryogenic refrigeration unit |
US5235818A (en) * | 1990-09-05 | 1993-08-17 | Mitsubishi Denki Kabushiki Kaisha | Cryostat |
US5398511A (en) * | 1992-03-30 | 1995-03-21 | Mitsubishi Denki Kabushiki Kaisha | Regenerative refrigerator |
US5291740A (en) * | 1992-07-02 | 1994-03-08 | Schnurer Steven D | Defrosting tool for cryostat cold head interface |
DE4318406A1 (de) * | 1993-06-03 | 1994-12-08 | Leybold Ag | Verfahren zum Betrieb eines Refrigerators und für die Durchführung dieses Verfahrens geeigneter Refrigerator |
US5878580A (en) * | 1993-06-03 | 1999-03-09 | Leybold Aktiengesellschaft | Method of operating a cryogenic cooling device, and a cryogenic cooling device suitable for operation by this method |
DE4418724A1 (de) * | 1994-05-28 | 1995-11-30 | Leybold Ag | Verfahren und Vorrichtung zur Erzeugung sehr tiefer Temperaturen |
DE19510620A1 (de) * | 1995-03-23 | 1996-09-26 | Leybold Ag | Refrigerator |
JP2877094B2 (ja) * | 1996-09-13 | 1999-03-31 | ダイキン工業株式会社 | 極低温冷凍機及びその制御方法 |
US6360554B1 (en) * | 1998-10-28 | 2002-03-26 | Interdynamics, Inc. | Single can automotive air conditioner refill and treatment |
DE10229311A1 (de) * | 2002-06-29 | 2004-01-29 | Leybold Vakuum Gmbh | Refrigerator mit Regenerator |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU29389A1 (fr) * | ||||
DE2153404A1 (de) * | 1971-10-27 | 1973-05-03 | Gutehoffnungshuette Sterkrade | Vorrichtung zum ein- udn ausbau von maschinen in oder aus behaelter |
GB1554724A (en) * | 1976-10-08 | 1979-10-31 | British Steel Corp | Reducing the escape of a gaseous subtance from a gas main |
DE3120233A1 (de) * | 1981-05-21 | 1982-12-09 | Leybold-Heraeus GmbH, 5000 Köln | Refrigerator |
EP0119846A2 (fr) * | 1983-03-21 | 1984-09-26 | Texas Instruments Incorporated | Réfrigérateur à cycle détaché actionné pneumatiquement |
-
1986
- 1986-07-29 EP EP86110463A patent/EP0254759A1/fr not_active Withdrawn
-
1987
- 1987-07-29 US US07/079,110 patent/US4761963A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU29389A1 (fr) * | ||||
DE2153404A1 (de) * | 1971-10-27 | 1973-05-03 | Gutehoffnungshuette Sterkrade | Vorrichtung zum ein- udn ausbau von maschinen in oder aus behaelter |
GB1554724A (en) * | 1976-10-08 | 1979-10-31 | British Steel Corp | Reducing the escape of a gaseous subtance from a gas main |
DE3120233A1 (de) * | 1981-05-21 | 1982-12-09 | Leybold-Heraeus GmbH, 5000 Köln | Refrigerator |
EP0119846A2 (fr) * | 1983-03-21 | 1984-09-26 | Texas Instruments Incorporated | Réfrigérateur à cycle détaché actionné pneumatiquement |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0350290A2 (fr) * | 1988-07-07 | 1990-01-10 | The BOC Group plc | Réfrigérateurs cryogéniques |
EP0350290A3 (en) * | 1988-07-07 | 1990-12-05 | The Boc Group Plc | Cryogenic refrigerators |
EP0437661A1 (fr) * | 1990-01-18 | 1991-07-24 | Leybold Aktiengesellschaft | Sonde froide avec un réfrigérateur cryogénique du type Gifford-McMahon |
Also Published As
Publication number | Publication date |
---|---|
US4761963A (en) | 1988-08-09 |
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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: 19870629 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE GB NL |
|
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: 19890201 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KIESE, GERHARD, DR. |