EP0561384A1 - Hermetically encased compressor with spring suspension - Google Patents

Hermetically encased compressor with spring suspension Download PDF

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Publication number
EP0561384A1
EP0561384A1 EP93104358A EP93104358A EP0561384A1 EP 0561384 A1 EP0561384 A1 EP 0561384A1 EP 93104358 A EP93104358 A EP 93104358A EP 93104358 A EP93104358 A EP 93104358A EP 0561384 A1 EP0561384 A1 EP 0561384A1
Authority
EP
European Patent Office
Prior art keywords
compressor
cylindrical section
prop member
end portion
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.)
Withdrawn
Application number
EP93104358A
Other languages
German (de)
English (en)
French (fr)
Inventor
Maurizio Bucciarelli
Lanfranco Pol
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.)
ACC Compressors SpA
Original Assignee
Zanussi Elettromeccanica SpA
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 Zanussi Elettromeccanica SpA filed Critical Zanussi Elettromeccanica SpA
Publication of EP0561384A1 publication Critical patent/EP0561384A1/en
Withdrawn legal-status Critical Current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
    • 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
    • F04B39/127—Mounting of a cylinder block in a casing

Definitions

  • the present invention relates to a hermetically encased compressor, particularly for domestic refrigerating appliances, of the type comprising a volumetric motor-compressor unit supported within a hermetically sealed casing by means of a spring suspension system.
  • a spring suspension system with a view to reducing the noise produced by the compressor, to provide a spring suspension systemwith at least three points of support situated substantially in a horizontal plane below the center of gravity of the motor-compressor unit. More specifically, the points of support are usually distributed about the periphery of the base of the motor-compressor unit and have each attached thereto the upper end of a cylindrical spring the opposite (lower) end of which takes support on an associated vertical prop member resting on the bottom of the casing of the compressor and preferably made of steel.
  • each prop member has an upwards projecting portion of a reduced diameter, including a first cylindrical section and a second narrower portion, and projecting partially into the associated spring when the latter is in the relaxed state.
  • the narrower upper end portion of the support prop member is usually of frustoconical shape, with its lateral surface inclined at an angle of about 6 o with respect to the vertical axis of the prop member and the spring, the latter being usually made of steel wire having a diameter of about 1.6 mm.
  • the vibratory stresses to which the anchoring system of the suspension units is subjected during the transient phases of starting and stopping the operation of the compressor may be interpreted as the impulsive response (i. e. the product of the resultant of the excitation of the system by the inherent mode of vibration of the structure) on the part of a system constituted by a spring having one end simply supported (with finite impedance) on the associated prop member and its other end fixedly secured to the motor-compressor unit.
  • the dampening effect of the system is determined by the dampening properties of the spring plus the dampening component resulting from friction between the surface of the prop member and the windings of the spring when these two components are in mutual contact.
  • the dampened noise produced by a suspension during the transient at the time of stopping the operation of the compressor (this being generally the transient generating the strongest noise), has a typical profile as represented in fig. 1 of the drawings.
  • the noise thus produced is represented by a curve in which for a period T there occurs a succession of peaks of logarithmically decreasing amplitude, with a maximum peak amplitude P.
  • this function measured experimentally, may be taken as the representation of a displacement, an acceleration, or a sonar pressure.
  • the noise generated by the suspension system in a compressor of the known type is undesirably strong, with a peak amplitude P corresponding to about 47 to 49 dB and a duration T of between 1.5 and 1.8 seconds.
  • this object is attained in a hermetically encased compressor including a spring suspension system incorporating the characteristics of the appended claims.
  • the hermetically encased compressor shown is substantially of the same type as the known compressor used for measuring the noise represented in fig. 1. It is mainly composed of a hermetically sealed casing 6 enclosing a volumetric compressor 7 adapted to be driven by an electric motor 8. As per se known, the motor-compressor unit 7, 8 takes support on the bottom of casing 6, containing a liquid lubricant bath 9, by the intermediary of a suspension system comprising at least three (preferably four) suspension units generally indicated at 10 and evenly distributed about the base of the motor-compressor unit 7, 8 below the center of gravity thereof. With additional reference to figs.
  • each suspension unit 10 comprises a cylindrical spring 11 made of steel and having its upper end fixedly secured to the base of the motor-compressor unit in a per se known and therefore not shown manner.
  • the lower end of each spring 11 (considered under rest conditions as in figs 2 and 4) is partially slipped in a force-fit onto an associated prop member 12 preferably made of steel and mounted in vertical position on the base of casing 6.
  • each prop member 12 comprises a lower first cylindrical section 13 of a major diameter and an upper second cylindrical section 14 having a smaller diameter and terminating in a frustoconical end portion 15.
  • the second cylindrical section 14 including its frustoconical end portion 15 are normally received within the associated spring 11, the lower end of which takes support on the shoulder defining the upper end of the first cylindrical section 13 of the prop member.
  • Each spring 11 is preferably made of a steel wire having a diameter of about 1.5 mm, the spring having an inner diameter of about 10.9 mm, an axial length (in the relaxed state) of about 28.5 mm, and a constant pitch between windings of about 2 mm.
  • each prop member 12 correspondingly has a diameter of about 10.9 mm, while its axial length, inclusive of its frustoconical end portion 15, is about 13 mm, that is to say, fractionally shorter than half the axial length of the spring 11.
  • the lateral surface of the frustoconical end portion 15 has an inclination of about 10 o to 12 o , preferably 11 o , relative to the axis 16 of the respective prop member 12.
  • the frustoconical end portion 15 preferably has a blunt end and an axial length of about 9.5 mm.
  • the supporting prop members 12 interact to a surprisingly limited degree with the associated springs 11 over the major part of their vibration range, so that the emission of transient noise during start and stop operations of the compressor is substantially dampened.
  • the noise produced at the location of each suspension unit 10 of the compressor according to the invention in a compressor stop transient period comprises a series of oscillations which is of substantially limited duration and displays substantially low peak values.
  • this surprising result of acoustic optimization has been obtained in the first place by ensuring the maximum attrition dampening of the oscillations of the springs 11, and at the same time by minimizing the number of possible impacts between the components which would act to transmit the oscillation energy of the springs.
  • hermetically encased compressor as described may of course undergo any suitable modifications within the purview of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP93104358A 1992-03-18 1993-03-17 Hermetically encased compressor with spring suspension Withdrawn EP0561384A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN920011U 1992-03-18
IT92PN000011U IT229033Y1 (it) 1992-03-18 1992-03-18 Compressore ermetico con sospensioni molleggiate

Publications (1)

Publication Number Publication Date
EP0561384A1 true EP0561384A1 (en) 1993-09-22

Family

ID=11394625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104358A Withdrawn EP0561384A1 (en) 1992-03-18 1993-03-17 Hermetically encased compressor with spring suspension

Country Status (2)

Country Link
EP (1) EP0561384A1 (it)
IT (1) IT229033Y1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102691643A (zh) * 2011-03-18 2012-09-26 惠而浦股份有限公司 用于制冷压缩机的悬挂弹簧

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1573649A (en) * 1976-04-21 1980-08-28 Danfoss As Motor compressor units
DE3006316A1 (de) * 1980-02-20 1981-09-03 Robert Bosch Gmbh, 7000 Stuttgart Motorverdichter
US4431383A (en) * 1978-06-08 1984-02-14 Robert Bosch Gmbh Motor compressor for refrigerators

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1573649A (en) * 1976-04-21 1980-08-28 Danfoss As Motor compressor units
US4431383A (en) * 1978-06-08 1984-02-14 Robert Bosch Gmbh Motor compressor for refrigerators
DE3006316A1 (de) * 1980-02-20 1981-09-03 Robert Bosch Gmbh, 7000 Stuttgart Motorverdichter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, M field, vol. 2, no. 5, January 13, 1978 THE PATENT OFFICE JAPANESE GOVERNMENT page 6386 M 77 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102691643A (zh) * 2011-03-18 2012-09-26 惠而浦股份有限公司 用于制冷压缩机的悬挂弹簧
WO2012126074A1 (en) * 2011-03-18 2012-09-27 Whirlpool S.A. Suspension spring for a refrigeration compressor

Also Published As

Publication number Publication date
IT229033Y1 (it) 1998-06-24
ITPN920011V0 (it) 1992-03-18
ITPN920011U1 (it) 1993-09-18

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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