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US20190093648A1 - Versatile housing of compressor motors - Google Patents

Versatile housing of compressor motors Download PDF

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Publication number
US20190093648A1
US20190093648A1 US16/139,227 US201816139227A US2019093648A1 US 20190093648 A1 US20190093648 A1 US 20190093648A1 US 201816139227 A US201816139227 A US 201816139227A US 2019093648 A1 US2019093648 A1 US 2019093648A1
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United States
Prior art keywords
housing
motor
crankshaft
sidewall
forming
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.)
Abandoned
Application number
US16/139,227
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English (en)
Inventor
Varaprasad Ventrapragada
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
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 Koninklijke Philips NV filed Critical Koninklijke Philips NV
Priority to US16/139,227 priority Critical patent/US20190093648A1/en
Assigned to KONINKLIJKE PHILIPS N.V. reassignment KONINKLIJKE PHILIPS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VENTRAPRAGADA, VARAPRASAD
Publication of US20190093648A1 publication Critical patent/US20190093648A1/en
Abandoned 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
    • 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
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B39/128—Crankcases
    • 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
    • F04B39/14—Provisions for readily assembling or disassembling
    • 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
    • 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
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders

Definitions

  • the present disclosure pertains to methods and systems for versatile housing of different sized motors in a reciprocating compressor.
  • crankshafts of reciprocating (piston) compressors are operated by a motor housed in a generally cylindrical motor housing.
  • the motor housing may couple to an outer or inner surface of crankcases.
  • the motor housing and/or the crankcase are often modified for fitting within the pump, blower, compressor, or other mechanical system. Therefore, there remains a need for improving existing compressors to avoid such significant and costly modifications to the constituent components of a compressor (e.g., to the crankcases, motor housing, assembly fixtures, etc.) when the application requires a differently sized motor or motor stator.
  • the compressor comprises: a cylinder forming a space for compressing a fluid; a crankshaft housing operatively coupled to the cylinder; a crankshaft housed within the crankshaft housing; a rod assembly configured to reciprocate within the cylinder so as to compress the fluid within the space, the rod assembly being driven by the crankshaft; a motor housing operatively coupled to the crankshaft housing; and a motor housed within the motor housing.
  • the motor is configured to drive the crankshaft.
  • the motor housing may be operatively coupled to the crankshaft housing, and the motor housing may be further configured to be operatively coupled to another crankshaft housing.
  • the motor housing may comprise a first inner sidewall, a first outer sidewall, a second inner sidewall, a second outer sidewall, and an intermediate portion interposed between the first outer sidewall and the second inner sidewall.
  • first inner and first outer sidewalls may form at least part of a first cylindrical shell
  • second inner and second outer sidewalls may form at least part of a second cylindrical shell
  • at least one of the first or second cylindrical shell may be configured such that the first and second cylindrical shells have different axial lengths
  • at least one of the first or second cylindrical shell may be configured such that the first and second cylindrical shells have different radial lengths.
  • the present disclosure relates to a method for operatively coupling a compressor assembly to differently dimensioned motor stators in a reciprocating compressor.
  • the method is implemented with respect to the compressor, which comprises a cylinder, a crankshaft housing, a crankshaft, a rod assembly, a motor housing, and a motor.
  • the motor housing comprises a first inner sidewall, a first outer sidewall, a second inner sidewall, a second outer sidewall, and an intermediate portion. The intermediate portion may be interposed between the first outer sidewall and the second inner sidewall.
  • the first inner and first outer sidewalls may form at least part of a first cylindrical shell, and the second inner and second outer sidewalls may form at least part of a second cylindrical shell.
  • the method includes: forming, with the cylinder, a space for compressing a fluid; operatively coupling the crankshaft housing to the cylinder; housing the crankshaft within the crankshaft housing; operatively coupling the motor housing to the crankshaft housing; housing the motor within the motor housing, the motor being configured to drive the crankshaft; reciprocating the rod assembly within the cylinder so as to compress the fluid within the space, the rod assembly being driven by the crankshaft; operatively coupling the motor housing to the crankshaft housing, the motor housing being further configured to be operatively coupled to another crankshaft housing; configuring at least one of the first or second cylindrical shell such that the first and second cylindrical shells have different axial lengths; and configuring at least one of the first or second cylindrical shell such that the first and second cylindrical shells have different radial lengths.
  • Still another aspect of the present disclosure relates to a system configured to operatively couple a compressor assembly to differently dimensioned motor stators.
  • the system comprises: means for forming a space for compressing a fluid; means for housing a crankshaft operatively coupled to the means for forming the space; means for reciprocating within the means for forming the space so as to compress the fluid within the space, the means for reciprocating being driven by the crankshaft; and means for housing a motor that drives the crankshaft.
  • the means for housing the motor is operatively coupled to the means for housing the crankshaft, and the means for housing the motor is further configured to be operatively coupled to another means for housing a crankshaft.
  • the means for housing the motor comprises: first means for forming an inner sidewall, first means for forming an outer sidewall, second means for forming an inner sidewall, second means for forming an outer sidewall, and means for interposing between the first means for forming the outer sidewall and the second means for forming the inner sidewall.
  • the first means for forming the inner sidewall and the first means for forming the outer sidewall may form at least part of a first cylindrical shell
  • the second means for forming the inner sidewall and the second means for forming the outer sidewall may form at least part of a second cylindrical shell.
  • at least one of the first or second cylindrical shell is configured such that the first and second cylindrical shells have different axial lengths
  • at least one of the first or second cylindrical shell is configured such that the first and second cylindrical shells have different radial lengths.
  • the motor housing operatively coupled to a crankshaft housing and configured to be operatively coupled to another crankshaft housing.
  • the motor housing comprises a first inner sidewall, a first outer sidewall, a second inner sidewall, a second outer sidewall, and an intermediate portion interposed between the first outer sidewall and the second inner sidewall.
  • the first inner and first outer sidewalls form at least part of a first cylindrical shell
  • the second inner and second outer sidewalls form at least part of a second cylindrical shell
  • at least one of the first or second cylindrical shell is configured such that the first and second cylindrical shells have different axial lengths.
  • Still another aspect of the present disclosure relates to a motor housing operatively coupled to a crankshaft housing and configured to be operatively coupled to another crankshaft housing.
  • the motor housing comprises a first inner sidewall, a first outer sidewall, a second inner sidewall, a second outer sidewall, and an intermediate portion interposed between the first outer sidewall and the second inner sidewall.
  • the first inner and first outer sidewalls form at least part of a first cylindrical shell
  • the second inner and second outer sidewalls form at least part of a second cylindrical shell
  • at least one of the first or second cylindrical shell is configured such that the first and second cylindrical shells have different radial lengths.
  • FIG. 1 is a schematic illustration of a cross-sectional view of a twin-head, reciprocating compressor with housings
  • FIG. 2A illustrates an exemplary twin-head, reciprocating compressor with housings
  • FIG. 2B illustrates an exemplary motor housing
  • FIG. 3A illustrates an isometric view of an exemplary crankcase with different surfaces for mating to a motor housing, in accordance with one or more embodiments
  • FIG. 3B illustrates an isometric view of another exemplary crankcase with different surfaces for mating to a motor housing, in accordance with one or more embodiments
  • FIG. 4 illustrates an exemplary cross-sectional view of a motor, in accordance with one or more embodiments
  • FIG. 5 illustrates isometric views of exemplary motors having different stack lengths, in accordance with one or more embodiment
  • FIG. 6A illustrates isometric views of an exemplary motor housing, in accordance with one or more embodiments
  • FIG. 6B illustrates a planar view of an exemplary motor housing, in accordance with one or more embodiments
  • FIG. 7 illustrates an exemplary cross-sectional view of a motor housing, in accordance with one or more embodiments
  • FIG. 8A is a schematic illustrations of a cross-sectional view of a twin-head, reciprocating compressor with motor and housings, in accordance with one or more embodiments;
  • FIG. 8B is a schematic illustrations of a cross-sectional view of a twin-head, reciprocating compressor with motor and housings, in accordance with one or more embodiments;
  • FIG. 9A illustrates in an isometric view an exemplary motor housing, in accordance with one or more embodiments.
  • FIG. 9B illustrates in an isometric view an exemplary motor housing, in accordance with one or more embodiments.
  • FIG. 9C illustrates in an isometric view an exemplary motor housing, in accordance with one or more embodiments.
  • FIG. 9D illustrates in an isometric view an exemplary motor housing, in accordance with one or more embodiments.
  • FIG. 10 illustrates a method for versatile housing of different sized motors in a reciprocating compressor
  • the word “unitary” means a component is created as a single piece or unit. That is, a component that includes pieces that are created separately and then coupled together as a unit is not a “unitary” component or body.
  • the statement that two or more parts or components “engage” one another shall mean that the parts exert a force against one another either directly or through one or more intermediate parts or components.
  • the term “number” shall mean one or an integer greater than one (i.e., a plurality).
  • FIG. 1 illustrates compressor 10 .
  • compressor 10 includes cylinders 12 a and 12 b for compressing a fluid, such as a liquid or gas, rod assemblies 14 a and 14 b, crankshafts 72 a and 72 b, and/or other components.
  • a fluid such as a liquid or gas
  • rod assemblies 14 a and 14 b crankshafts 72 a and 72 b, and/or other components.
  • the number of cylinders and crankcases used in the examples herein is not to be construed as limiting, since the disclosed embodiments may apply to pumps, blowers, or compressors having other arrangements and any number of cylinders and crankcases.
  • Rod assemblies 14 a and 14 b may be configured to reciprocate in cylinders 12 a and 12 b, respectively, so as to compress the fluid.
  • Crankshafts 72 a and 72 b may be configured to drive rod assemblies 14 a and 14 b within cylinders 12 a and 12 b, respectively.
  • Rod assemblies 14 a and 14 b include one or more valves 52 a and 52 b and cup seals 60 a and 60 b and/or other components.
  • Volume clearance is a space remaining within cylinders 12 a and 12 b when rod assemblies 14 a and 14 b are at the most advanced position in their travel within cylinders 12 a and 12 b.
  • Managing clearance volume may enhance the compressor's performance.
  • Compressor 10 may be used in oil-less applications where service is performed to replace worn-out cup seals after a given number of hours of operation (e.g., medical oxygen concentrator compressors) and/or in other applications.
  • First crankshaft housing 18 a encloses first crankshaft 72 a, is operatively coupled to first rod assembly 14 a, and is configured to drive first rod assembly 14 a.
  • first crankshaft 72 a is operatively coupled with motor shaft 16 that provides torsional energy from motor 76 (shown in FIGS. 4, 5, and 8 ), which is housed within motor housing 22 .
  • motor shaft 16 is operatively coupled with second crankshaft 72 b, which is housed within second crankshaft housing 18 b located at first side 44 along second side 46 of compressor assembly 10 .
  • motor 76 is an electric motor. In some embodiments, motor 76 operates within a compressor, pump, blower, or other mechanical device. Motor 76 may be self-commutated and/or externally-commutated, including, e.g., universal motors, alternating current (AC) motors, direct current (DC) motors, or other types of motors. More specifically, motor 76 may be a permanent split capacitor AC induction motor, a brush DC motor, a permanent magnet brushless DC motor, a stepper motor, a shaded pole motor, a switch reluctance motor, or another particular type of motor. For a further description of motor 76 , see the description of FIG. 4 , below.
  • first crankshaft 72 a is configured to drive first rod assembly 14 a to compress gas within first reciprocating space 11 a .
  • second crankshaft 72 b may be configured to drive second rod assembly 14 b to compress gas within second reciprocating space 11 b.
  • Second space 11 b may be defined by second rod assembly 14 b, second cylinder 12 b, and second cap seal 13 b on along second side 46 of compressor assembly 10 .
  • the components along second side 46 of compressor assembly 10 may be the same and/or similar to the components located along third side 42 of the compressor assembly 10 .
  • first cap seal 13 a located at fourth side 40 and along third side 42 may be the same as and/or similar to second cap seal 13 b located along second side 46 .
  • compressor 10 has a tandem arrangement with cylinders 12 a and 12 b, having a rod assembly 14 a and 14 b received therein.
  • a motor shaft 16 is configured to couple the motor to crankshafts 72 a and 72 b, which are coupled with one of the rod assemblies 14 a and 14 b, so that the movement of rod assemblies 14 a and 14 b may oppose each other.
  • rod assemblies 14 a and 14 b are configured to alternately reciprocate within cylinders 12 a and 12 b, respectively, so as to compress the fluid.
  • Crankshafts 72 a and 72 b are configured to drive pistons 14 a and 14 b within cylinders 12 a and 12 b.
  • Crankshafts 72 a and 72 b are housed in crankcases or crankshaft housings 18 a and 18 b that are operatively coupled with cylinders 12 a and 12 b , respectively.
  • Crankcases 18 a and 18 b may each be associated with one of cylinders 12 a or 12 b.
  • Motor 76 is operatively coupled with the crankshafts 72 a and 72 b and is configured to drive crankshafts 72 a and 72 b.
  • Motor 76 may be housed in motor housing 22 , which may be operatively coupled with crankcases 18 a and 18 b.
  • rod assemblies 14 a and 14 b may have lower ends 68 a and 68 b with bearing centers 71 a and 71 b configured to receive a portion of the crankshafts 72 a and 72 b, respectively.
  • Crankshafts 72 a and 72 b may be offset and thus not in linear correlation to the axis of motor shaft 16 .
  • motor housing 22 includes motor 76 configured to drive crankshafts 72 a and 72 b.
  • Motor shaft 16 rotates crankshafts 72 a and 72 b, which in turn causes rod assemblies 14 a and 14 b to reciprocate upwardly and downwardly within cylinders 12 a and 12 b.
  • This configuration enables compressor assembly 10 to increase the pressure of the fluid.
  • motor 76 is coupled to housing or shell 22 , as shown in FIGS. 1, 2A, and 2B . More specifically, in some embodiments, motor stator 77 is coupled to shell 22 and motor 76 envelops motor shaft 16 , as shown in FIG. 1, 2A, 2B, 4, and 5 . In some embodiments, as shown in FIGS. 1-5 , motor stator 77 , motor stator windings 75 , motor rotor 74 , motor bearing 73 , and motor shell 22 are assembled together, with respect to crankcase housings 18 a and 18 b.
  • Crankshaft housings or crankcases 18 a and 18 b may then be assembled onto respective ends of motor 76 (e.g., through the use of bearings 69 a, 69 b, 70 a, and/or 70 b ).
  • Some or more of these machine (e.g., compressor) components may be coupled to respective faces or surfaces of each other via any suitable mechanical means, such as via adhesive and/or other coupling components.
  • an adhesive may operate at their interfaces, as depicted with respect to outer sidewall surface 19 a of crankcase 18 a (or 18 b ) and an inner sidewall surface of motor housing 22 in FIGS. 1 and 3A .
  • the interface comprises inner sidewall 19 b of crankcase 18 a (or 18 b ) and an outer sidewall of motor housing 22 .
  • the versatile motor housing (e.g., motor housing 22 ) is configured to be machined such that installation of different motors into the compressor does not require modification to the corresponding crankcase (e.g., crankcases 18 a and 18 b ).
  • crankcases 18 a and 18 b may be coupled to various, different motors via motor housing 22 .
  • Motor housing 22 may be configured (e.g., machined to size) to facilitate its adaptation to any of a variety of different applications or compressor platforms. See further description of motor housing 22 , below.
  • Crankcases 18 a and 18 b may be die cast (e.g., of aluminum, magnesium, zinc alloys, steel, iron, or another suitable material) to form its various shapes and features, as shown, e.g., in FIGS. 3A-3B .
  • motor housing 22 may be die cast (e.g., of aluminum, magnesium alloys, zinc alloys, steel, iron, ceramic, plastic, composite, or another suitable material).
  • the crankcases may require extensive machining, replacement, and/or other modifications. The modifications may include changes to the assembly fixtures. Tighter tolerances may be achieved by machining the die cast component.
  • motor housing 22 advantageously minimizes these costs by being configured to facilitate machining of its dimensional details (e.g., of its radial and/or axial lengths, as discussed in greater detail below) without requiring modification to assembly fixtures and/or to crankcases 18 a and 18 b.
  • Some embodiments may simplify the process to accommodate different motor stack lengths. Some embodiments facilitate a substantially static footprint or form factor for the compressor upon first determining or establishing the footprint or form factor. That is, in some embodiments, one instantiation of motor housing 22 may accommodate multiple types, models, and/or sizes (i.e., motors of varying efficiencies, rates, costs, etc.) of motors 76 , while requiring minimal or no change to the corresponding crankcases 18 a and 18 b. Motor housing 22 is thus configured to be versatile and cost-effective, requiring minimal or no external dimensional change to compressor 10 . In some embodiments, even isolation mounts for securing compressor 10 may become standardized, being thus independent of a compressor's components' weight, shape, or size.
  • one or more features on motor housing 22 are configured to be machined, rendering the component more versatile with respect to different motors 76 .
  • outer sidewall 19 a of crankcase housing 18 a may mate with inner sidewall 25 of motor housing 22 .
  • Inner sidewall 25 may be concentric, at a second level (i.e., at a larger radial length), with respect to inner sidewall 23 , at a first level (i.e., at a shorter radial length).
  • a second level i.e., at a larger radial length
  • an inner ring (or shell) of motor housing 22 may be axially machined shorter.
  • both the inner and outer rings are axially shortened; in still other embodiments, just the outer ring is axially shortened.
  • Axial lengths (ALs) of inner ring 31 and outer ring 32 may be the same, but disclosed embodiments do not require them to be the same, as shown in FIG. 7 , where AL 1 and AL 2 are depicted different from each other. Resulting from this versatility of motor housing 22 , the compressor may axially shorten and clearance volumes on either side of motor 76 may be minimized.
  • FIG. 2A illustrates an exemplary twin-head, reciprocating compressor with housings and FIG. 2B illustrates an exemplary motor housing.
  • axial screws 33 are used to secure crankcases 18 a and 18 b to both sides of motor housing 22 .
  • Motor housing 22 may, in some embodiments, include openings 21 . Openings 21 may be of any quantity and shape (e.g., circular, square, polygonal, kidney-shaped, etc.), in providing air flow within motor housing 22 .
  • FIGS. 3A-3B illustrate isometric views of exemplary crankcases with different surfaces for mating to a motor housing, in accordance with one or more embodiments.
  • crankcase 18 a may be die cast or otherwise fabricated as shown, for example, in FIGS. 3A and 3B .
  • FIG. 3A depicts outer surface 19 a for mating to an inner surface of motor housing 22 .
  • FIG. 3B depicts inner surface 19 b for mating to an outer surface of motor housing 22 .
  • FIG. 4 illustrates an exemplary cross-sectional view of a motor, in accordance with one or more embodiments.
  • Compressor 10 may include different motors of different types, models, and/or sizes (e.g., with different radial or axial stack lengths) to work in a same use-case (e.g., a particular application).
  • Motor 76 may include stator 77 , windings 75 , rotor 74 , bearing 73 , and shaft 16 .
  • motor 76 may be conventional in its size and/or functionality.
  • motor 76 has a shape, as shown in FIG. 4 , and in other embodiments motor 76 may be of another shape (e.g., annular).
  • Each of the different motors may be differently sized, dimensioned, and/or shaped (e.g., a circular, square, or any other polygonal shape such as pentagonal, hexagonal, octagonal, etc.), and the motor may require a differently sized, dimensioned, and/or shaped housing (e.g., a circular, square, or any other polygonal shape such as pentagonal, hexagonal, octagonal, etc.).
  • a motor housing e.g., motor housing 22
  • motor housing 22 to different motors that are, e.g., smaller, typically complicates the fitting.
  • Disclosed embodiments may overcome one or more of these limitations.
  • FIG. 5 illustrates isometric views of exemplary motors having different (axial) stack lengths, in accordance with one or more embodiments.
  • motor housing 22 has an axial length that can accommodate motor 76 with a largest stack length, such as motor 76 shown to the left of the other motors 76 .
  • the form factor may be used with any of a variety of different motors 76 .
  • the chosen form factor may thus support a maximally sized motor and all smaller motors.
  • crankcase 18 a may remain the same.
  • Crankcase 18 a and/or motor housing 22 may thus become standardized for supporting multiple, different motors 76 .
  • FIG. 6A illustrates isometric views of an exemplary motor housing
  • FIG. 6B illustrates a planar view of the exemplary motor housing, in accordance with one or more embodiments.
  • Motor housing 22 may include first inner sidewall 23 , first outer sidewall 24 , second inner sidewall 25 , second outer sidewall 26 , and intermediate portion 27 . Intermediate portion 27 may be interposed between first outer sidewall 24 and second inner sidewall 25 .
  • First inner sidewall 23 and first outer sidewall 24 may form at least part of first cylindrical ring or shell 31 , as shown in FIG. 7 .
  • second inner sidewall 25 and second outer sidewall 26 may form at least part of second cylindrical ring or shell 32 , as shown in FIG. 7 .
  • shells may be generally (e.g., not perfectly) cylindrical.
  • the generally cylindrical second shell 32 may span at least part of the axial length of motor 76 (e.g., not including motor shaft 16 , which may extend axially outwards towards crankcases 18 a and 18 b ).
  • Shell 32 may include a recessed, circumferential portion 29 , as shown in FIGS. 6-8 and 9A-9B . That is, in some embodiments, motor housing 22 may include rectangular recess 29 along a central portion of second cylindrical shell 32 (and/or first cylindrical shell 31 ).
  • intermediate portion 27 may include openings 28 .
  • openings or holes 28 may all be kidney-shaped, circular, or a combination of kidney-shaped and circular.
  • openings 28 may be of another shape or size than is depicted in FIGS. 6 and 9 . That is, openings 28 may be, in some embodiments, square (or other polygon) shaped, oval shaped, and/or other suitably shaped.
  • One or more or all of openings 28 may partially traverse or fully pass through intermediate portion 27 . These openings may provide cooling and/or weight reduction benefits. Openings 28 of intermediate portion 27 may cause intermediate portion 27 to increase in surface area for enhanced (e.g., convective) cooling.
  • Openings 21 may also be on the outer surface of motor housing 22 , as shown in FIGS. 1, 2A, and 2B , enabling, e.g., a fan to blow on the compressor for cooling purposes (e.g., for cooling at least the motor and the area at the bearings). Openings 21 on the outer surface of motor housing 22 and slots 55 a of crankcase 18 a, as shown in FIG. 1 , provide cross-ventilation.
  • motor housing 22 may have no openings, openings 21 and/or 28 being thus optional for at least weight reduction or more efficient cooling.
  • FIG. 7 illustrates an exemplary cross-sectional view of motor housing 22 , in accordance with one or more embodiments.
  • motor housing 22 has variable axial lengths (ALs).
  • AL 1 of the inner ring is greater than AL 2 of the outer ring and in others AL 2 is greater than AL 1 , the latter being shown in FIG. 7 .
  • AL 1 is the same as AL 2 .
  • an axial length of intermediate portion 27 is the same as axial lengths of the first cylindrical shell (AL 1 ) and the second cylindrical shell (AL 2 ). In other embodiments, an axial length of intermediate portion 27 is different than AL 1 and/or AL 2 .
  • AL 1 and/or AL 2 are less than a stack length of motor 76 . In other embodiments, AL 1 and/or AL 2 are greater than a stack length of motor 76 . These relative lengths are merely provided as a general reference, as the present disclosure is not limited to any particular size or dimension of any of the various different components and pieces of compressor 10 .
  • motor housing 22 has variable radial lengths (RLs), including variable thicknesses of inner and outer rings 31 and 32 .
  • RL 1 and RL 2 of inner ring 31 are different than RL 3 and RL 4 of outer ring 32 .
  • RL 1 , RL 2 , RL 3 , and RL 4 may all be different from one another.
  • This versatility may enable motor housing 22 to couple at least a portion of its inner sidewall 23 (i.e., of the inner ring) or at least a portion of its inner sidewall 25 (i.e., of the outer ring) to an outer surface of a variety of different motor stators.
  • At least a portion of inner sidewall 23 or inner sidewall 25 may also be coupled to outer surface 19 a of crankcase 18 a.
  • at least a portion of outer sidewall 24 (i.e., of the inner ring) or outer sidewall 26 (i.e., of the outer ring) may couple to inner surface 19 b of crankcase 18 a.
  • the outer ring may be machined to be much shorter axially than the inner ring, further enabling weight reduction.
  • RL 1 has a range of about 0.2 inches to 48.0 inches.
  • RL 4 has a range of about 0.27 inches to 60.0 inches.
  • the lengths of RL 2 and RL 3 are in between the lengths of RL 1 and RL 4 .
  • These exemplary lengths are merely provided as a general reference, as the present disclosure is not limited to any particular size or dimension of any of the various different components and pieces of compressor 10 .
  • Each of the radial lengths may in some embodiments comprise a radius of motor housing 22 , e.g., extending from an axial center of housing 22 to a surface (or center) of the housing (or ring).
  • inner ring 31 or outer ring 32 is machined such that RL 1 or RL 3 increases.
  • RL 1 or RL 3 may increase by removing material of the respective ring in the machining process, effectively thinning the ring.
  • inner ring 31 may be machined to a variable extent to accommodate motor stator 77 , which may have a radial length that is greater than RL 1 (or even RL 2 ).
  • outer ring 32 may be machined before coupling to crankcase 18 a.
  • inner ring 31 is configured such that a portion of the ring is machined, and in other embodiments the entire inner ring is machined to remove the inner ring, resulting in just intermediate portion 27 and outer ring 32 .
  • intermediate portion 27 may be machined. In some of these embodiments, intermediate portion 27 may be machined out entirely, resulting in just the outer ring. The amount of machining of the inner or outer ring may depend on axial and radial lengths of motor stator 77 and on (e.g., orientation or dimensions) of the mating surface of crankcase 18 a.
  • FIGS. 8A-8B are schematic illustrations of a cross-sectional view of a twin-head, reciprocating compressor with motor and housings, in accordance with one or more embodiments.
  • Motor 76 may cooperate with other components (e.g., bearings 68 a , 69 a, crankshaft 72 a, windings 75 , and/or stator 77 ) for turning motor shaft 16 .
  • Motor housing 22 may couple to, adhere to, and/or envelop motor 76 .
  • Motor housing 22 may further couple to crankcase 18 a via one or more surfaces of either its inner or outer ring.
  • second inner sidewall 25 may couple to outer surface 19 a of crankcase 18 a.
  • FIG. 8A second inner sidewall 25 may couple to outer surface 19 a of crankcase 18 a.
  • second outer sidewall 26 may couple to inner surface 19 b of crankcase 18 a.
  • crankcase 18 a the same coupling techniques described herein apply to other crankcase (e.g., crankcase 18 b ).
  • crankcase housings 18 a and 18 b may couple to the inner ring of motor housing 22 .
  • the outer ring may be machined to a minimal axial length.
  • Various different motors may couple to the crankcases by adhering to either inner sidewall 23 or inner sidewall 25 of the inner or outer ring, respectively.
  • one set of compressor manufacturing assembly fixtures may be used with motors of varying diameters resulting in a simplified and efficient compressor assembly process.
  • FIGS. 9A-9D illustrate in isometric views exemplary motor housings, in accordance with one or more embodiments.
  • Motor housing 22 in some embodiments, may itself take different forms, sizes, and shapes, as shown in the examples of FIGS. 6A, 6B, 7, and 9A-9D .
  • one of an inner sidewall or an outer sidewall of motor housing 22 may be used when coupling to motor 76 , these sidewalls having different axial and radial lengths.
  • FIG. 7 shows motor housing 22 having two levels at differing radial lengths, these levels being described, e.g., as an inner ring and an outer ring.
  • Each of the different surfaces may be used for mating or mounting to crankcase housing 18 a . That is, the example of FIG. 7 depicts four mounting surfaces (i.e., outer sidewall 26 of the outer ring, inner sidewall 25 of the outer ring, outer sidewall 24 of the inner ring, or inner sidewall 23 of the inner ring).
  • FIG. 10 illustrates a method 100 for operatively coupling a compressor assembly to differently dimensioned motor stators in a reciprocating compressor.
  • the compressor includes a cylinder, a crankcase, a crankshaft, a motor housing, a motor, and a rod assembly, and/or other components.
  • method 100 presented below are intended to be illustrative. In some embodiments, method 100 may be accomplished with one or more additional operations not described, and/or without one or more of the operations discussed. Additionally, the order in which the operations of method 100 are illustrated in FIG. 10 and described below is not intended to be limiting. The operations of FIG. 10 may be executed in any order (i.e., not necessarily as shown in FIG. 10 ).
  • a space for compressing a fluid is formed via a cylinder.
  • operation 102 is performed by a cylinder the same as or similar to cylinder 12 a (shown in FIG. 1 and described herein).
  • crankcase is operatively coupled to the cylinder.
  • operation 104 is performed by a crankcase the same as or similar to crankcase 18 a (shown in FIG. 1 and described herein).
  • crankshaft is housed within the crankcase.
  • operation 106 is performed by a crankshaft the same as or similar to crankshaft 72 a (shown in FIG. 1 and described herein).
  • a first cylindrical shell is formed by a first inner sidewall and a first outer sidewall of a motor housing.
  • operation 108 is performed by a first inner sidewall and a first outer sidewall the same as or similar to first inner sidewall 23 and first outer sidewall 24 (shown in FIGS. 6-8 and described herein).
  • a second cylindrical shell is formed by a second inner sidewall and a second outer sidewall of the motor housing.
  • operation 110 is performed by a second inner sidewall and a second outer sidewall the same as or similar to second inner sidewall 25 and second outer sidewall 26 (shown in FIGS. 6-8 and described herein).
  • an intermediate portion is formed between the first outer sidewall and the second inner sidewall of the motor housing.
  • the forming of the intermediate portion may include formation of openings.
  • operation 112 is performed by an intermediate portion the same as or similar to intermediate portion 27 (shown in FIGS. 6-8 and described herein).
  • At operation 114 at least one of the first or second cylindrical shell is machined or otherwise configured such that the first and second cylindrical shells have different axial lengths and such that a particular motor may fit within the motor housing.
  • the motor may be coupled to one of the first or second cylindrical shell.
  • operation 114 is performed with a motor housing the same as or similar to motor housing 22 (shown in FIGS. 6-8 and described herein).
  • At operation 116 at least one of the first or second cylindrical shell is machined or otherwise configured such that the first and second cylindrical shells have different radial lengths and such that the particular motor may fit within the motor housing.
  • operation 116 is performed with a motor housing the same as or similar to motor housing 22 (shown in FIGS. 6-8 and described herein).
  • the motor is housed within the motor housing.
  • the motor is configured to drive the crankshaft.
  • operation 118 is performed by a motor and a motor housing the same as or similar to motor 76 and motor housing 22 (shown in FIGS. 8A-8B and described herein).
  • the motor housing is operatively coupled to an outer or inner surface of the crankcase.
  • the decision as to whether to couple to the outer surface or to the inner surface of the crankcase may be based on a size, shape, or dimensions of the crankcase, motor housing, and/or motor.
  • operation 120 is performed by a motor housing and a crankcase the same as or similar to motor housing 22 and crankcase 18 a (shown in FIGS. 8A-8B and described herein).
  • a piston is reciprocated within the cylinder.
  • operation 122 is performed by a piston and a cylinder the same as or similar to piston 14 a and cylinder 12 a (shown in FIG. 1 and described herein).
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” or “including” does not exclude the presence of elements or steps other than those listed in a claim.
  • several of these means may be embodied by one and the same item of hardware.
  • the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • any device claim enumerating several means several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain elements are recited in mutually different dependent claims does not indicate that these elements cannot be used in combination.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US16/139,227 2017-09-28 2018-09-24 Versatile housing of compressor motors Abandoned US20190093648A1 (en)

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US16/139,227 US20190093648A1 (en) 2017-09-28 2018-09-24 Versatile housing of compressor motors

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US (1) US20190093648A1 (fr)
EP (1) EP3692262B1 (fr)
JP (1) JP7257392B2 (fr)
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WO2019063348A1 (fr) 2019-04-04
EP3692262B1 (fr) 2023-05-03
CN111164307B (zh) 2022-09-16
EP3692262A1 (fr) 2020-08-12
CN111164307A (zh) 2020-05-15
JP7257392B2 (ja) 2023-04-13
JP2020535347A (ja) 2020-12-03

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