US20020168280A1 - Housing for screw compressor - Google Patents
Housing for screw compressor Download PDFInfo
- Publication number
- US20020168280A1 US20020168280A1 US09/853,812 US85381201A US2002168280A1 US 20020168280 A1 US20020168280 A1 US 20020168280A1 US 85381201 A US85381201 A US 85381201A US 2002168280 A1 US2002168280 A1 US 2002168280A1
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- US
- United States
- Prior art keywords
- housing
- rotor
- discharge
- section
- motor
- 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.)
- Granted
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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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A housing for a screw compressor, includes a single-piece casting defining a motor housing section and a rotor housing section and has an inlet for compressor medium, an outlet end and a bridge member disposed between the motor housing section and the rotor housing section and defining an inlet side bearing housing; a discharge housing mounted to the outlet end and defining an outlet and a discharge side bearing housing; and at least one rotor disposed in the rotor housing section and rotatably mounted between the inlet side bearing housing and the discharge side bearing housing.
Description
- The invention relates to a housing for a screw compressor and, more particularly, to a housing for a hermetic multi-rotor screw compressor.
- Screw compressors typically have several different housing members. A housing must be provided for the rotor or rotors, and a separate housing is typically provided for the motor which drives the rotors. Separate housings are typically required due to length of the rotors, and for other reasons.
- These housing designs can be problematic in providing a hermetic compressor. Further, access to the rotor for servicing and the like is difficult in that entire housing members must be repositioned to access same, and these housings are heavy and bulky.
- Multi-rotor screw compressors typically have multiple discharge ports, see for example U.S. Pat. No. 5,807,091 to Shaw. These discharge ports typically remove refrigerant or other compressed medium from the rotors in a radially outward direction and then convey this flow to a collection chamber for discharging a single stream. The positioning of these discharge ports and collection chambers impose a change in direction of flow on the refrigerant which can cause reduction in efficiency.
- The motor portion of such compressors tends to general heat and requires cooling. Cooling can be accomplished with oil or other cooling medium, and U.S. Pat. No. 6,045,344 shows a compressor wherein coolant is passed through the motor housing by an end suction which causes the cooling medium to pass through the entire motor assembly.
- It is clear that the need remains for an improved housing for screw compressors so as to address the aforesaid disadvantages.
- It is therefore the primary object of the present invention to provide such a housing.
- It is a further object of the present invention to provide a housing including a discharge port which improves flow efficiency of refrigerant or other compressor medium.
- It is a still further object of the present invention to provide such a housing which provides for simplified cooling of the motor.
- It is another object of the present invention to provide a housing which has a low manufacturing cost.
- Other objects and advantages of the present invention will appear hereinbelow.
- The foregoing objects and advantages of the present invention have been readily attained.
- In accordance with the present invention, a housing for a screw compressor is provided, which comprises a single-piece casting defining a motor housing section and a rotor housing section and having an inlet for compressor medium, an outlet end and a bridge member disposed between said motor housing section and said rotor housing section and defining an inlet side bearing housing; a discharge housing mounted to said outlet end and defining an outlet and a discharge side bearing housing; and at least one rotor disposed in said rotor housing section and rotatably mounted between said inlet side bearing housing and said discharge side bearing housing.
- In accordance with one aspect of the invention, the inlet is arranged so as to introduce compressor medium into the housing between the motor housing section and the rotor housing section, by suction, which leads to cooling of the motor housing section as the compressor medium is passed to the rotors.
- In accordance with a further aspect of the present invention, the bridge member extends inwardly from an inner surface of the housing so as to define an inlet side bearing housing for the rotors and motor, while allowing compressor medium to flow around the bridge through flow channels defined therebetween and to the rotors.
- In accordance with yet another aspect of the present invention, the discharge housing defines discharge ports for the rotor which extend away from the rotor both radially and axially so as to provide for more efficient flow of compressor medium from the rotors to the discharge pipe.
- A detailed description of preferred embodiments of the present invention follows, with reference to the attached drawings, wherein:
- FIG. 1 illustrates a side sectional view of a compressor including a housing in accordance with the present invention;
- FIG. 2 illustrates a further sectional view of the housing of FIG. 1, sectioned at a 90° angle to the view of FIG. 1;
- FIG. 3 is a cross section taken through the housing of FIG. 1 to illustrate the structure of the bridge member;
- FIG. 4 is a cross section taken through an end cap of the housing of FIG. 1 to show the discharge ports in accordance with the present invention;
- FIG. 5 is a discharge side view of a discharge housing in accordance with the present invention;
- FIG. 6 is a rotor-side view of a discharge housing in accordance with the present invention; and
- FIG. 7 is an end view of a housing showing the surface for connection with the discharge housing in accordance with the present invention.
- The invention relates to a screw compressor and, more particularly, to a housing design for a multi-rotor screw compressor, preferably a tri-rotor screw compressor, wherein the housing is advantageously a single casting and various other advantages are provided.
- Multi-screw compressors may for example have a male rotor and at least two female rotors, and helical type compressors are wall known in the art. In such a configuration, the male rotor is typically the drive rotor, and is driven by a motor of the compressor, and such compressors find use in numerous environments, for example in the heating, ventilation, refrigeration and air conditioning (HVRAC) industry.
- Referring to the figures, a compressor including a housing in accordance with the present invention is illustrated.
- FIG. 1 shows a
compressor 10 having ahousing 12 defining amotor housing section 14 and arotor housing section 16.Housing 12 in accordance with the present invention is preferably a single-piece casting so as to facilitate use of the housing in providing a hermetic screw compressor assembly. - A
motor 18 is disposed inmotor housing section 14, and one ormore rotors 20 are disposed inrotor housing section 16.Motor 18 drivesrotors 20 so as to draw refrigerant or other compressor medium into aninlet 22 ofhousing 12 for feed torotors 20 as desired.Rotors 20 compress the refrigerant drawn therein, and discharge such compressor medium through adischarge housing 24 to acollection chamber 26 and on to the intended use of the discharged medium. - An
end cover 15 may advantageously be provided closing the end ofmotor housing section 14. - Referring to FIGS. 1 and 2 together,
housing 12 has aninner surface 28 which serves to define the various housing sections, and from which abridge member 30 extends so as to define an inlet side bearing housing. Referring also to FIG. 3, which is a cross sectional view taken throughbridge member 30, it is readily apparent that bridge member defines threebearings flow channels bridge member 30 andinner surface 28. -
Bearing 32 serves to receive a central or sun rotor as will be discussed below, andbearings motor 18 is typically operatively associated with or directly connected to the sun rotor throughbridge member 30 as illustrated in FIGS. 1 and 2. - Also as shown in FIGS. 1 and 2,
housing 12 may advantageously have an increaseddiameter section 42 positioned at the location ofbridge member 30 so as to further define an inlet area for receiving compressor medium throughinlet 22, by suction, as desired. As shown by arrows in FIG. 1, compressor medium flows throughinlet 22 and aroundbridge member 30, throughflow channels rotors 20 from both sides ofbridge member 30. - This is advantageous in providing efficient flow of refrigerant to the rotors.
- Still referring to FIGS.1-3 and particularly to FIG. 1, positioning of
inlet 22 betweenmotor housina section 14 androtor housing section 16 advantageously provides for flow of compressor medium past a portion ofmotor 18 so as to provide a cooling of same. This is accomplished without flowing compressor medium throughmotor housing section 14 as is done in the prior art. - Referring to FIG. 2,
sun rotor 44 is schematically illustrated and connected tomotor 18 through ashaft 46 which passes throughbridge member 30 and sun rotor bearing 32. - FIG. 2 also illustrates
planet rotors planet rotor bearings sun rotor 44 for being driven by same. - Turning now to FIGS. 4, 5 and6,
discharge housing 24 is further illustrated. In accordance with the present invention,discharge housing 24 advantageously defines a discharge bearing housing for receiving the discharge ends ofsun rotor 44 andplanet rotors Discharge housing 24 advantageously has arotor side surface 52 which is illustrated in FIG. 6 and adischarge side surface 54 which is illustrated in FIGS. 4 and 5. As shown in these figures,discharge housing 24 defines a sun rotor bearing 56 and twoplanet rotor bearings Discharge housing 24, by being connectable and removable fromhousing 12, advantageously allows access to rotors disposed inhousing 12 without requiring separation of the entire rotor housing from the entire motor housing as is required in conventional devices. -
Discharge housing 24 and/orhousing 12 further definedischarge ports 62 which are communicated withrotors 20, anddischarge ports 62 are advantageously positioned so as to extend away fromrotors 20 both radially and axially.Discharge ports 62 may be defined bydischarge housing 24 alone, or may be partially defined byhousing 12, specifically a portion ofrotor housing section 16. FIGS. 5-7 illustrate portions of each of these members which define the desired discharge ports. -
Discharge ports 62 allow for rotor tips and end clearances to be checked, through the discharge ports, after the compressor is assembled. - FIG. 7 shows an
end face 64 ofrotor housing section 16, including inner surfaces 66 which define at least partially cylindrical areas forhousing rotors 20 as desired. A portion ofdischarge port 62 is shown at 68, and extends away fromrotors 20 in a radial direction so as to allow radial discharge fromrotors 20 as desired. - Turning to FIG. 6, another
portion 70 ofdischarge ports 62 is illustrated, as defined onrotor side surface 52 ofdischarge housing 24. FIG. 6 shows the extent ofrotors 20 in dashed lines so as to illustrate thatportion 70 overlaps or intersects with an end surface of the area defined for rotors such that compressor medium can be discharged axially, as wall as radially, fromrotors 20 intodischarge ports 62 as desired. - As shown,
discharge port portion 70 as defined throughdischarge housing 24 preferably extends helically fromrotor side surface 52 to dischargeside surface 54 so as to accommodate the imparted swirling motion of discharged compressor medium as the medium flows tocollection chamber 26 for discharge through an outlet pipe as desired. Thus, dischargehousing 24 has aninlet 72 toportion 70 ofdischarge port 62 and anoutlet 74 fromportion 70 ofdischarge port 62 which are both illustrated in FIG. 6. -
Discharge ports 62 as illustrated in FIGS. 4-7 are preferably contoured as shown so as to encourage efficient flow through same. It should of course be appreciated that these ports could be provided having a different shape, and with different contours, as desired. It is particularly advantageous, however, thatdischarge ports 62 intersect the substantially cylindrically-shaped housings forrotors 20 both radially and axially, at the end surface of the chamber, so as to allow for both radially and axially discharge of compressor medium fromrotors 20 as desired. - Referring back to FIG. 5, it may also be desirable to provide
internal relief valves discharge housing 24. In accordance with the present invention, dischargehousing 24 has a thickness defined betweenrotor side surface 52 and dischargeside surface 54, and reducedthickness sections 80, withrelief valves thickness sections 80. This advantageously simplifies the installation and structure of relief valves. In further accordance with this aspect of the present invention, reducedthickness sections 80 are preferably provided by forming contoured walls, or depressions indischarge side surface 54 so as to define the reduced thickness sections in whichvalves collection chamber 26, which is defined in part bydischarge side surface 54, while nevertheless allowing for installation ofrelief valves -
Collection chamber 26 is illustrated in FIG. 1 and is any suitable end-cap structure suitable for securing to dischargehousing 24.Collection chamber 26 and the end wall ofdischarge housing 24 define a collection zone for compressed medium, andcollection chamber 26 is preferably provided having anoutlet 82 for discharge of compressed medium fromcompressor 10. - It should readily be appreciated that the foregoing disclosure provides a housing for a compressor which is a substantial improvement over existing compressor housings and which allows for efficient cooling of the motor and flow of compressor medium while also allowing simplified access to rotors disposed in the housing for routine maintenance and the like.
- The compressor housing finds particular use in connection with screw compressors for the HVRAC industry, and is particularly useful for this motor-rotor configuration. The housing is equally useful in connection with other helical type compressors, for example compressors with different working fluids such as helium, air, ammonia and the like, and this housing finds equal application in compressors which have different configurations of driven rotors, as wall.
- It is to be understood that the invention is not limited to the illustrations described and shown herein, which are deemed to be merely illustrative of the best modes of carrying out the invention, and which are susceptible of modification of form, size, arrangement of parts and details of operation. The invention rather is intended to encompass all such modifications which are within its spirit and scope as defined by the claims.
Claims (10)
1. A housing for a screw compressor, comprising:
a single-piece casting defining a motor housing section and a rotor housing section and having an inlet for compressor medium, an outlet end and a bridge member disposed between said motor housing section and said rotor housing section and defining an inlet side bearing housing;
a discharge housing mounted to said outlet end and defining a discharge outlet and a discharge side bearing housing; and
at least one rotor disposed in said rotor housing section and rotatably mounted between said inlet side bearing housing and said discharge side bearing housing.
2. The housing of claim 1 , wherein said inlet is positioned between and communicated with said motor housing section and said rotor housing section, whereby compressor medium flow into said inlet cools said motor housing section.
3. The housing of claim 1 , wherein said casting has an inner surface and said bridge member extends inwardly from said casting to define said inlet side bearing housing with at least two flow channels defined between said bridge member and said inner surface whereby said rotor is fed with said compressor medium through said at least two flow channels.
4. The housing of claim 1 , wherein said rotor comprises a sun rotor and two planet rotors, and wherein said inlet side bearing housing and said discharge side bearing housing define bearings for said sun rotor and said planet rotors.
5. The housing of claim 1 , further comprising a motor disposed in said motor housing section and operatively associated with said rotor through said bridge member.
6. The housing of claim 1 , wherein at least one of said rotor housing section and said discharge housing define at least one discharge port for discharging medium from said rotor, said discharge port extending away from said rotor both radially and axially.
7. The housing of claim 6 , further comprising a collection chamber communicated with said at least one discharge port and having an outlet whereby medium from said at least one discharge port is conveyed to said outlet.
8. The housing of claim 6 , wherein said rotor housing section and said discharge housing define in combination an at least partially cylindrical surface within which said rotor is positioned and a discharge end surface adjacent a discharge port intersects both said end of said rotor, and wherein said discharge port intersects both said at least partially cylindrical surface and said end surface whereby discharged medium is discharged from said rotor to said discharge port both radially and axially.
9. The housing of claim 1 , wherein said discharge housing has a rotor side surface and a discharge side surface, and a thickness defined between said rotor side surface and said discharge side surface and further comprising at least one reduced thickness section in said discharge housing and at least one relief valve positioned through said discharge housing at said reduced thickness section.
10. The housing of claim 9 , wherein said reduced thickness section is defined by a contoured wall set into said discharge housing from said discharge side surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/853,812 US6488480B1 (en) | 2001-05-11 | 2001-05-11 | Housing for screw compressor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/853,812 US6488480B1 (en) | 2001-05-11 | 2001-05-11 | Housing for screw compressor |
Publications (2)
Publication Number | Publication Date |
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US20020168280A1 true US20020168280A1 (en) | 2002-11-14 |
US6488480B1 US6488480B1 (en) | 2002-12-03 |
Family
ID=25316973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/853,812 Expired - Lifetime US6488480B1 (en) | 2001-05-11 | 2001-05-11 | Housing for screw compressor |
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US (1) | US6488480B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1020312A3 (en) * | 2012-02-28 | 2013-07-02 | Atlas Copco Airpower Nv | COMPRESSOR DEVICE, AS WELL AS USE OF SUCH SET-UP. |
US9850896B2 (en) | 2012-02-28 | 2017-12-26 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
US11015602B2 (en) | 2012-02-28 | 2021-05-25 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
Families Citing this family (12)
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US6652250B2 (en) * | 2000-10-16 | 2003-11-25 | Kobe Steel, Ltd. | Screw compressor having intermediate shaft bearing |
US6976833B2 (en) | 2003-11-17 | 2005-12-20 | Carrier Corporation | Compressor discharge chamber with baffle plate |
US20060065478A1 (en) * | 2004-09-30 | 2006-03-30 | Rockwell David M | Compressor sound suppression |
US7121814B2 (en) * | 2004-09-30 | 2006-10-17 | Carrier Corporation | Compressor sound suppression |
EP1805417A4 (en) * | 2004-10-20 | 2010-10-06 | Carrier Corp | Compressor sound suppression |
DE202005005620U1 (en) * | 2005-04-08 | 2006-08-17 | Hawe Hydraulik Gmbh & Co. Kg | pump unit |
JP4521344B2 (en) * | 2005-09-30 | 2010-08-11 | 株式会社日立産機システム | Oil-cooled screw compressor |
US8956135B2 (en) * | 2008-05-30 | 2015-02-17 | Carrier Corporation | Screw compressor with asymmetric ports |
CN102216615B (en) * | 2008-09-18 | 2015-07-22 | 开利公司 | Multi-stage reciprocating compressor |
EP2224137B1 (en) * | 2009-02-26 | 2011-06-01 | Grundfos Management A/S | Motor pump unit |
JP5192440B2 (en) * | 2009-05-15 | 2013-05-08 | 株式会社神戸製鋼所 | Motor and compressor provided with the same |
CN102449306B (en) * | 2009-05-28 | 2015-03-25 | 开利公司 | Light weight crankcase casting for compressor |
Family Cites Families (10)
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US3809510A (en) * | 1973-03-22 | 1974-05-07 | Philco Ford Corp | Combination pressure relief and anti-slugging valve for a screw compressor |
JPS5434111A (en) * | 1977-07-13 | 1979-03-13 | Hitachi Ltd | Screw compressor |
JPS54115409A (en) * | 1978-03-01 | 1979-09-08 | Hitachi Ltd | Sealed type screw compressor |
US4181474A (en) | 1978-03-02 | 1980-01-01 | Dunham-Bush, Inc. | Vertical axis hermetic rotary helical screw compressor with improved rotary bearings and oil management |
US5222874A (en) | 1991-01-09 | 1993-06-29 | Sullair Corporation | Lubricant cooled electric drive motor for a compressor |
US5246349A (en) | 1991-03-18 | 1993-09-21 | Sullair Corporation | Variable reluctance electric motor driven vacuum pump |
JPH06173871A (en) * | 1992-12-03 | 1994-06-21 | Hitachi Ltd | Bearing device of screw compressor |
US5642992A (en) | 1995-10-30 | 1997-07-01 | Shaw; David N. | Multi-rotor helical screw compressor |
JP3499110B2 (en) | 1997-08-11 | 2004-02-23 | 株式会社神戸製鋼所 | Oil-cooled screw compressor |
-
2001
- 2001-05-11 US US09/853,812 patent/US6488480B1/en not_active Expired - Lifetime
Cited By (14)
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---|---|---|---|---|
BE1020312A3 (en) * | 2012-02-28 | 2013-07-02 | Atlas Copco Airpower Nv | COMPRESSOR DEVICE, AS WELL AS USE OF SUCH SET-UP. |
WO2013126969A1 (en) * | 2012-02-28 | 2013-09-06 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor device, as well as the use of such an assembly |
KR20140135175A (en) * | 2012-02-28 | 2014-11-25 | 아틀라스 캅코 에어파워, 남로체 벤누트삽 | Compressor device, as well as the use of such a compressor device |
CN104220757A (en) * | 2012-02-28 | 2014-12-17 | 阿特拉斯·科普柯空气动力股份有限公司 | Compressor device, as well as the use of such an assembly |
JP2015508857A (en) * | 2012-02-28 | 2015-03-23 | アトラス コプコ エアーパワー, ナームローゼ フェンノートシャップATLAS COPCO AIRPOWER, naamloze vennootschap | Compressor device |
EP2940303A1 (en) * | 2012-02-28 | 2015-11-04 | Atlas Copco Airpower | Compressor device, as well as the use of such an assembly |
CN105952639A (en) * | 2012-02-28 | 2016-09-21 | 阿特拉斯·科普柯空气动力股份有限公司 | Compressor device, as well as the use of such an assembly |
KR101693952B1 (en) | 2012-02-28 | 2017-01-17 | 아틀라스 캅코 에어파워, 남로체 벤누트삽 | Compressor deviceas well as the use of such a compressor device |
JP2017020516A (en) * | 2012-02-28 | 2017-01-26 | アトラス コプコ エアーパワー, ナームローゼ フェンノートシャップATLAS COPCO AIRPOWER, naamloze vennootschap | Compressor device |
US9850896B2 (en) | 2012-02-28 | 2017-12-26 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
US10151313B2 (en) | 2012-02-28 | 2018-12-11 | Atlas Copco Airpower, Naamloze Vennootschap | Compressor device as well as the use of such a compressor device |
US10197058B2 (en) | 2012-02-28 | 2019-02-05 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
US10480511B2 (en) | 2012-02-28 | 2019-11-19 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
US11015602B2 (en) | 2012-02-28 | 2021-05-25 | Atlas Copco Airpower, Naamloze Vennootschap | Screw compressor |
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US6488480B1 (en) | 2002-12-03 |
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