EP2435702A2 - Giessung eines leichtgewichtigen kurbelgehäuses für einen kompressor - Google Patents

Giessung eines leichtgewichtigen kurbelgehäuses für einen kompressor

Info

Publication number
EP2435702A2
EP2435702A2 EP10781089A EP10781089A EP2435702A2 EP 2435702 A2 EP2435702 A2 EP 2435702A2 EP 10781089 A EP10781089 A EP 10781089A EP 10781089 A EP10781089 A EP 10781089A EP 2435702 A2 EP2435702 A2 EP 2435702A2
Authority
EP
European Patent Office
Prior art keywords
compressor
crankcase
casting
bridge
compartment
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
Application number
EP10781089A
Other languages
English (en)
French (fr)
Other versions
EP2435702B1 (de
EP2435702A4 (de
Inventor
Paul J. Flanigan
Peter J. Pileski
Amit Vaidya
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP2435702A2 publication Critical patent/EP2435702A2/de
Publication of EP2435702A4 publication Critical patent/EP2435702A4/de
Application granted granted Critical
Publication of EP2435702B1 publication Critical patent/EP2435702B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings

Definitions

  • the present disclosure generally relates to compressors and, more particularly, relates to crankcase castings used in compressors for high-pressure fluids.
  • Compressors are common devices for compressing various fluids into higher densities.
  • Compressors come in a variety of forms including, but not limited to, reciprocating, scroll and screw compressors.
  • reciprocating compressors a piston moves back and forth within a compression cylinder to compress the working fluid within the cylinder
  • scroll compressors interleaved scrolls rotate relative to one another to pressurize the fluid between the scrolls.
  • one of the scrolls is fixed with the other scroll eccentrically rotating about that fixed scroll, but both scrolls can also rotate simultaneously as long as their axes of rotation are offset.
  • screw compressors use multiple meshed positive-displacement helical screws to force fluid into a smaller space.
  • compressors In connection with air conditioning equipment, reciprocating compressors are often used.
  • the compressor is used to compress the refrigerant such as, but not limited to, carbon dioxide (CO 2 ).
  • CO 2 carbon dioxide
  • the refrigerant is compressed to a very high pressure. This increases the temperature of the refrigerant so that when it then passes on to a condenser and then on to an evaporator, heat from the area to be cooled can be extracted and dissipated to the outside ambient air.
  • the refrigerant is compressed to a very high pressure of, for example, 500-2000 psi.
  • This compression occurs within the crankcase of the compressor.
  • the crankcase not only must be the crankcase therefore be manufactured from a material able to withstand that high pressure fluid, but current safety regulations in the United States, the European Union and other countries require that the crankcase be able to withstand at least five times the operating pressure of the refrigerant. This is known as the burst pressure, and is dictated by, among other things, European Union Safety Standard EN60335-2-34.
  • European Union Safety Standard EN378 Another applicable standard is European Union Safety Standard EN378 which requires that the crankcase be able to withstand two to five times the low side pressure relief valve setting of the compressor.
  • a compressor which comprises a motor, a compression element operatively associated with the motor, and a housing surrounding the motor and compression element, the housing including at least one bridge extending between opposing sides of the housing and being integrally cast with the housing.
  • a casting for use with a refrigerant compressor which comprises a motor compartment adapted to house a motor, a crankcase compartment integral with the motor compartment and adapted to house at least one moving compression element, and a bridge spanning across the crankcase compartment, wherein the motor compartment, crankcase compartment, and bridge are cast as one integral piece.
  • FIG. 1 is an isometric view of a compressor constructed in accordance with the teachings of the disclosure
  • FIG. 2 is a lateral cross-sectional view of the compressor of FIG. 1;
  • FIG. 3 is a longitudinal cross-sectional view of the compressor of FIG. l;
  • FIG. 4 is an isometric view of a casting constructed in accordance with the teachings of the disclosure.
  • FIG. 5 is a longitudinal cross-sectional view of the casting of FIG. 4 taken along line 5-5 of FIG. 4;
  • FIG. 6 is a lateral cross-sectional view of the casting of FIG. 4.
  • FIG 7 is a bottom view of the casting of FIG. 4.
  • a compressor constructed in accordance with the teachings of the disclosure is generally referred to by reference numeral 20. While the following detailed description and drawings are made in reference to a reciprocating type of compressor, it to be understood that the teachings of the disclosure can be used to manufacture a casting for use with many types of compressors including, but not limited to, reciprocating, scroll and screw compressors. In addition, while reference is made to compression of refrigerants, of course a compressor constructed in accordance with the teaching of the disclosure can be used to compress any type of fluid as well.
  • the compressor 20 is shown to include a housing or casting 22 having a power end 24 and a working end 26. As will be described in further detail therein, the power and working ends are constructed so as to draw uncompressed fluid into an intake 28 and produce compressed fluid at a discharge 30.
  • FIGS. 2 and 3 the compressor 20 is shown in lateral and longitudinal cross-section. Starting first with the longitudinal sectional view of FIG. 3, a motor 32 is shown mounted within a motor compartment 34 of the housing 22, while a plurality of compression elements 36 are mounted within a crankcase compartment 38. As will be noted, the motor compartment 34 and crankcase compartment 38 are integrally formed together as by a metal casting process.
  • the motor 32 may include a stator 40 within which a rotor 42 rotates when electrically induced.
  • a driveshaft 44 extends from the rotor 42 and into the crankcase compartment 38. As shown in both FIGS. 2 and 3, the driveshaft 44 terminates at a distal end 46 with one or more eccentrics 48.
  • the eccentrics 48 are provided so as to rotate in offset fashion relative to the driveshaft.
  • each cylinder 56 Cast into the crankcase compartment 38 are a plurality of compression cylinders 56 which are sized so as to closely receive a piston 52 therein and allow for such reciprocating motion of the piston 52 to compress a working fluid (not showing) such as a refrigerant like CO 2 or the like. Enclosing each cylinder 56 may be a cylinder head 58.
  • the crankcase compartment 38 may include first and second generally opposed side walls 60, 62 connected by an upper or top wall 64.
  • a removable bottom cover 66 may be connected to the crankcase compartment 38 by way of a series of fasteners 68, such as bolts or the like.
  • the crankcase compartment 38 is substantially sealed. This is of importance in that the CO 2 refrigerant compressed by the compressor 20 is typically compressed to a pressure of 500-1000 psi ( ⁇ 3.5 - 7 MPa) or more. This is known as the operating pressure of the working fluid.
  • the bridge 70 may be integrally cast with the walls 60 and 62 and extend therebetween. More specifically, as opposed to prior art devices which provide a crankcase compartment 38 which would be completely open between the housing walls 60, 62, the present disclosure provides the bridge 70 spanning between the walls 60 and 62. This in turn enables the walls 60 and 62, as well as top wall 64 and bottom cover 66 to be manufactured from relatively thin materials.
  • the inventors have found, through finite element analysis and other inventive experimentation, that the thickness (t) of walls 60 and 62 can be reduced by up to twenty-nine (29) percent or more by employing the bridge 70. More specifically, by employing the bridge 70, one tested wall had a maximum first principal stress at a certain wall location of 219 MPa, whereas the same thickness wall but without a bridge had a maximum first principal stress at the same wall location of 283 MPa. Comparing these two values, this showed a stress ratio of 283/219 or 1.29, thus illustrating the at least twenty-nine percent savings in wall thickness afforded by the present disclosure. [0027] Another way to measure this improvement is in terms of wall deformation.
  • the shape of the bridge 70 is shown to include a substantially linear bottom edge 72. Accordingly, as shown in FIG. 2, when the bottom cover 66 is bolted onto the housing 22, the bottom edge 72 is in constant engagement with the bottom cover 66.
  • the bridge 70 therefore not only provides additional strength against buckling between the generally opposed side walls 60 and 62, but also provides mid-span support for the bottom cover 60 to reduce stress and allow for a thinner bottom cover plate 66 to be used as well.
  • the bridge 70 further includes first and second side edges 74 and 76 which are integrally cast with the outer walls 60 and 62, as well as a curvilinear top edge 78.
  • a valley 80 of the curvilinear top edge 78 may be provided within the center of the top edge 78, with lateral ends of the top edge 78 being higher than the valley 80.
  • more than one bridge can be provided.
  • two bridges 70 are provided but of course it can be understood that more than two bridges can be provided as well, depending on the overall size of the compressor 10 and the number of compression elements 36 therein.
  • the present disclosure sets forth a compressor (20) and a casting (22) for a compressor (2) which is substantially lighter in weight than prior art castings, but which still provides the necessary strength and protection to satisfy the burst requirements of the compressor (20). Accordingly, in applications where US, European and other nationalities dictate the compressor (20) to have a certain burst strength, the present disclosure sets forth a way to meet such requirements but at less cost to the manufacturer and consumer.
  • the casting (22) can be made from less expensive and lighter weight materials.
  • prior art compressors (20) would have to be manufactured from ductile cast iron to provide the strength required, the present disclosure allows the use of other materials, such as but not limited to gray cast iron.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP10781089.7A 2009-05-28 2010-05-25 Giessung eines leichtgewichtigen kurbelgehäuses für einen kompressor Not-in-force EP2435702B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18192209P 2009-05-28 2009-05-28
PCT/US2010/036073 WO2010138510A2 (en) 2009-05-28 2010-05-25 Light weight crankcase casting for compressor

Publications (3)

Publication Number Publication Date
EP2435702A2 true EP2435702A2 (de) 2012-04-04
EP2435702A4 EP2435702A4 (de) 2015-07-29
EP2435702B1 EP2435702B1 (de) 2019-01-02

Family

ID=43223326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10781089.7A Not-in-force EP2435702B1 (de) 2009-05-28 2010-05-25 Giessung eines leichtgewichtigen kurbelgehäuses für einen kompressor

Country Status (5)

Country Link
US (1) US20120093665A1 (de)
EP (1) EP2435702B1 (de)
CN (1) CN102449306B (de)
DK (1) DK2435702T3 (de)
WO (1) WO2010138510A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6138531B2 (ja) * 2013-03-18 2017-05-31 本田技研工業株式会社 発電機用内燃機関
US12123803B2 (en) * 2020-08-27 2024-10-22 University Of Idaho Rapid compression machine with electrical drive and methods for use thereof

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Also Published As

Publication number Publication date
WO2010138510A3 (en) 2011-03-03
DK2435702T3 (en) 2019-03-04
CN102449306A (zh) 2012-05-09
US20120093665A1 (en) 2012-04-19
EP2435702B1 (de) 2019-01-02
WO2010138510A2 (en) 2010-12-02
CN102449306B (zh) 2015-03-25
EP2435702A4 (de) 2015-07-29

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