EP0175354A2 - Compresseur à vis pour fluides gazeux - Google Patents

Compresseur à vis pour fluides gazeux Download PDF

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Publication number
EP0175354A2
EP0175354A2 EP85111778A EP85111778A EP0175354A2 EP 0175354 A2 EP0175354 A2 EP 0175354A2 EP 85111778 A EP85111778 A EP 85111778A EP 85111778 A EP85111778 A EP 85111778A EP 0175354 A2 EP0175354 A2 EP 0175354A2
Authority
EP
European Patent Office
Prior art keywords
housing
bore
screw compressor
outlet window
pressure chamber
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Withdrawn
Application number
EP85111778A
Other languages
German (de)
English (en)
Other versions
EP0175354A3 (fr
Inventor
Adalbert Stenzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bitzer Kuehlmaschinenbau GmbH and Co KG
Original Assignee
Bitzer Kuehlmaschinenbau GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bitzer Kuehlmaschinenbau GmbH and Co KG filed Critical Bitzer Kuehlmaschinenbau GmbH and Co KG
Publication of EP0175354A2 publication Critical patent/EP0175354A2/fr
Publication of EP0175354A3 publication Critical patent/EP0175354A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
    • F04C28/16—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using lift valves

Definitions

  • the invention relates to a screw compressor for gaseous media with two helically toothed, axially parallel, driven rotors, with a housing enclosing the rotors, with an inlet opening on the housing for the non-compressed medium, with an outlet window arranged on an end or peripheral wall of the housing for the compressed Medium, with a pressure chamber located behind the outlet window and with a pressure line connected to the pressure chamber for discharging the compressed medium.
  • Screw compressors have an outlet window for the medium compressed between the intermeshing rotors. Through the cross-sectional area of the outlet window is the internal pressure ratio of the compression set. If the screw compressor is to be used for a different pressure ratio, it must be designed with a pressure window of a different dimension.
  • the shape of the outlet window is changed by reducing or increasing the area of the outlet cross section.
  • swingable or displaceable segments are used, the shape of which is adapted to the contours of the rotors and the outlet window.
  • Such a design of a shape of the outlet window is complex to manufacture and prone to failure in operation.
  • the object is achieved in that the cross-sectional shape of the outlet window is unchangeable, that in addition to the outlet window and separately from this at least one hole in the end or peripheral wall of the housing leads from the interior of the housing into the pressure chamber, and that in this bore a spring-loaded overflow valve is arranged.
  • the housing 1 of a screw compressor for gaseous media shown in FIG. 1 has, in a manner known per se, an inlet opening 2 for non-compressed medium and a pressure chamber 3 for compressed medium.
  • the pressure chamber 3 is connected via a pressure line 4 to a system (not shown), for example a cooling or air conditioning system connected into which the medium compressed in the screw compressor is fed.
  • the pressure chamber 3 is formed in a housing wall 5 which closes the housing 1 at the end.
  • the interior 6 of the compressor is connected to the pressure chamber 3 in a manner known per se via an outlet window 7 with a certain outer contour (see FIG. 2).
  • Recesses 8, 9 of the housing 1 or the wall 5 accommodate bearings for two helically toothed rotors, the axes of which are parallel to one another in FIG. 2 and are designated 11 and 12, respectively.
  • the course of the two axes is indicated in FIG. 1 by the dash-dotted line 13.
  • the embodiment of a screw compressor shown comprises a main rotor 14 of larger diameter and a secondary rotor 15 of smaller diameter.
  • the interlocking helical toothings of the two rotors 14, 15 are indicated by dashed lines in FIG. 2 and denoted by 16 and 17, respectively.
  • One of the rotors, usually the main rotor 14, is driven by a motor (not shown) and takes the secondary rotor with it.
  • the outlet window 7 (FIG. 2) has an unchangeable cross-sectional shape which is fixed once and for all by its outer contour.
  • the wall 5 To the side and at a distance from the outlet window 7, the wall 5 has bores 18, 19, 21 which, like the outlet window 7, lead from the housing interior 6 into the pressure chamber 3. These holes 18, 19, 21 are provided in addition to and separately from the outlet window 7 and have no direct connection with it.
  • An overflow valve 22 is arranged in each of the bores 18, 19, 21, of which the valve associated with the bore 18 is shown in FIG. 3.
  • Each overflow valve 22 comprises a valve body 24 loaded by a compression spring 23, which can close the respective bore 18, 19, 21 in a medium-tight manner.
  • the main rotor 14 is assigned two bores 18, 19 with overflow valves and the secondary rotor 15 with a bore 21 with overflow valve. Basically, it would also suffice to provide only a single bore with an overflow valve or to assign each rotor only a single bore with an overflow valve, wherein the bores could also have different diameters.
  • the total outlet cross-sectional area of the screw compressor is greater than or equal to the outlet cross-sectional area of the outlet window 7.
  • the dimensioned outlet window 7 is selected according to the largest possible system pressure ratio.
  • the overflow valves 22 are then arranged in such a way that substantial over-compression in the screw compressor cannot occur up to a defined, smaller external pressure ratio.
  • valve body 24 of the overflow valve 22 which closes the respective bores 18, 19, 21 essentially fills the respective bore completely in the closed state (FIG. 3), and that of the housing interior 6 (on the left in FIG. 3)
  • the pressure chamber 3 is axially offset from the interior 6 of the compressor.
  • the pressure chamber 3 could also be offset radially to the interior 6, i.e.
  • the outlet window is of course also in the area of the peripheral wall mentioned and the bores for the overflow valves are also laterally offset from the outlet window in the peripheral wall 26.
  • the pressure line 4 discharging radially from the pressure chamber 3 in FIG. 1 could also be connected to the pressure chamber 3 in such a way that the compressed medium is discharged in the axial direction with respect to the screw compressor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP85111778A 1984-09-21 1985-09-18 Compresseur à vis pour fluides gazeux Withdrawn EP0175354A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3434694 1984-09-21
DE19843434694 DE3434694A1 (de) 1984-09-21 1984-09-21 Schraubenverdichter fuer gasfoermige medien

Publications (2)

Publication Number Publication Date
EP0175354A2 true EP0175354A2 (fr) 1986-03-26
EP0175354A3 EP0175354A3 (fr) 1987-09-02

Family

ID=6245988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111778A Withdrawn EP0175354A3 (fr) 1984-09-21 1985-09-18 Compresseur à vis pour fluides gazeux

Country Status (3)

Country Link
EP (1) EP0175354A3 (fr)
JP (1) JPS6179886A (fr)
DE (1) DE3434694A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703365A3 (fr) * 1994-09-13 1997-01-08 Mahle Gmbh Compresseur à vis
EP0937894A2 (fr) * 1994-08-19 1999-08-25 Diavac Limited Machine à vis pour fluide
US6494699B2 (en) * 2000-08-15 2002-12-17 Thermo King Corporation Axial unloading lift valve for a compressor and method of making the same
US8459963B2 (en) 2007-10-10 2013-06-11 Carrier Corporation Screw compressor pulsation damper

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE461052B (sv) * 1988-04-25 1989-12-18 Svenska Rotor Maskiner Ab Lyftventil vid en skruvrotormaskin
JP2535530Y2 (ja) * 1988-09-14 1997-05-14 三菱重工業株式会社 スクリュ圧縮機
JP5281978B2 (ja) * 2009-07-15 2013-09-04 日立アプライアンス株式会社 スクリュー圧縮機
JP5543746B2 (ja) * 2009-09-10 2014-07-09 株式会社前川製作所 スクリュー圧縮機の過圧縮防止装置
JP5389755B2 (ja) 2010-08-30 2014-01-15 日立アプライアンス株式会社 スクリュー圧縮機
JP5358608B2 (ja) 2011-03-30 2013-12-04 日立アプライアンス株式会社 スクリュー圧縮機及びこれを用いたチラーユニット

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519913A (en) * 1943-08-21 1950-08-22 Jarvis C Marble Helical rotary compressor with pressure and volume regulating means

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519913A (en) * 1943-08-21 1950-08-22 Jarvis C Marble Helical rotary compressor with pressure and volume regulating means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0937894A2 (fr) * 1994-08-19 1999-08-25 Diavac Limited Machine à vis pour fluide
EP0937894A3 (fr) * 1994-08-19 2000-01-05 Diavac Limited Machine à vis pour fluide
EP0703365A3 (fr) * 1994-09-13 1997-01-08 Mahle Gmbh Compresseur à vis
US6494699B2 (en) * 2000-08-15 2002-12-17 Thermo King Corporation Axial unloading lift valve for a compressor and method of making the same
US8459963B2 (en) 2007-10-10 2013-06-11 Carrier Corporation Screw compressor pulsation damper

Also Published As

Publication number Publication date
JPS6179886A (ja) 1986-04-23
DE3434694A1 (de) 1986-04-10
EP0175354A3 (fr) 1987-09-02

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