EP0428212A1 - Unité de moteur-compresseur - Google Patents

Unité de moteur-compresseur Download PDF

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Publication number
EP0428212A1
EP0428212A1 EP90202951A EP90202951A EP0428212A1 EP 0428212 A1 EP0428212 A1 EP 0428212A1 EP 90202951 A EP90202951 A EP 90202951A EP 90202951 A EP90202951 A EP 90202951A EP 0428212 A1 EP0428212 A1 EP 0428212A1
Authority
EP
European Patent Office
Prior art keywords
piston
motor
compressor
duct
situated
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Withdrawn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
EP90202951A
Other languages
German (de)
English (en)
Inventor
Antonius Adrianus Johannes Benschop
Johannus Christianus Martinus Roelofs
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
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics 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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0428212A1 publication Critical patent/EP0428212A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • 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
    • F04B35/045—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 using solenoids

Definitions

  • the invention relates to a motor-compressor unit comprising a hermetically sealed housing, a vibra­tion motor having a rotationally vibrating drive shaft, and a symmetrical twin free-piston compressor comprising two oppositely disposed identical free pistons, which can be reciprocated in respective cylinders by the drive shaft to influence a respective compression space, having cylinder end walls which each bound the respect­ive compression spaces and which each comprise inlet and outlet valves.
  • Such a motor-compressor is known from US-A-­3,937,600.
  • a problem associated with motor-compressors of this type is “drifting" of the piston, i.e. the piston drifts away from its centre position, causing the piston to run asymmetrically and the efficiency to be reduced.
  • US-A-3,937,600 relates to a motor-compressor and provides a solution to preclude an excessive piston stroke as a result of a decreasing resonant frequency of the mass-spring system, which may lead to collision of the piston against the cylinder end wall (overstroke prevention).
  • the compressor is provided with a gas-spring cylinder at both ends.
  • each cylinder is formed with a duct connecting the respective compression space to the space between the housing and the motor-compressor where the suction pressure prevails, which ducts are situated at equal distances from the respective cylinder end walls and can be closed by the respective pistons.
  • each duct The limits imposed on the location of each duct are dictated by a position of the end face of the piston when this piston occupies a centre position and by a position of the end face of the piston when this piston occupies a maximal extreme position at the end of a piston stroke.
  • each duct is disposed at a location where the end face of the piston is situated when this piston has reached an extreme position at the end of a piston stroke and when the compressor has pumped a desired minimum amount of medium.
  • the motor-compressor unit shown in Figure 1 comprises a vibration motor 1 and a symmetrical twin free-piston compressor 2.
  • the motor and the compressor are accommodated in a hermetically sealed housing 3.
  • the operation of the motor-compressor is described in EP-A-­0,155,057 and may be summarized as follows.
  • An alternat­ing current through the coils 4 of the vibration motor 1 results a rotary vibrational movement of the rotor 5 about the shaft 6.
  • the alternating magnetic field generated by the coils is superposed on the magnetic field produced by the permanent magnet 7.
  • the magnetic flux density in each rotor section alternately assumes a high and a low value.
  • the coils have been wound in such a way relative to the direction of magnetisation of the permanent magnets that two diagonally opposed rotor sections (5a, 5c) experience a high magnetic flux density at the same instant, while the other two rotor sections (5b, 5d) experience a low flux density.
  • This gives rise to a movement of the rotor sections in the air gaps 8 between the core 9 and the stator plates 10, where a high flux density exists.
  • a reversal of the current direction will bring about a reversal of the movement of the rotor 5, thus resulting in a vibrational movement of the rotor.
  • the compressor 2 comprises two cylinders 12, 13, in each of which one of two identical oppositely disposed free pistons 14, 15 can perform a linear reciprocating movement.
  • the pistons are integral with one another and in their centre they are connected to an arm 11 of the vibrating rotor 5 by means of a coupling 16.
  • medium is taken in, compressed and discharged by the pistons 14, 15 in the respective compression spaces 16, 17.
  • inlet and outlet valves 20, 21 are arranged in the cylinder end walls 19, 19.
  • the motor-compressor is included in a refrigerating system, not shown, whose low-pressure section (suction side) is connected to a space 22 between the hermetically sealed housing 3 and the motor-­compressor 1,2.
  • suction stroke medium is drawn directly from this space 22 into the compression spaces 16, 17 via inlet ports 23.
  • During a compression stroke medium is forced to the high-pressure section (pressure side) of the refrigerating system via outlet ports 24 and a line, not shown.
  • each cylinder 12, 13 is formed with a duct 26, 27, which ducts each connect the compression spaces 16 and 17 respectively to the space 22 and which are each situated at an equal dis­tance d from the respective cylinder end wall 18, 19.
  • a small amount of medium is first pressed into the space 22, where a suction pressure prevails, via a duct 26, 27, so that subse­quently the pressure build-up in each cylinder takes place with the same swept volume. This ensures that the piston 14, 15 remains correctly centred.
  • each duct is situated at the level of the end face 28, 29 of the piston. This is one limit.
  • each duct is situated at the level of the end face 28, 29 of the piston when this piston occupies a maximal extreme position at the end of a piston stroke. This is the other limit. Obviously, these limits are theoretical. In practice, the ducts will be situated somewhere between these limits and generally closer to the first-mentioned limit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
EP90202951A 1989-11-14 1990-11-08 Unité de moteur-compresseur Withdrawn EP0428212A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8902806 1989-11-14
NL8902806A NL8902806A (nl) 1989-11-14 1989-11-14 Motor-compressor eenheid.

Publications (1)

Publication Number Publication Date
EP0428212A1 true EP0428212A1 (fr) 1991-05-22

Family

ID=19855617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202951A Withdrawn EP0428212A1 (fr) 1989-11-14 1990-11-08 Unité de moteur-compresseur

Country Status (3)

Country Link
EP (1) EP0428212A1 (fr)
JP (1) JPH03168371A (fr)
NL (1) NL8902806A (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937600A (en) * 1974-05-08 1976-02-10 Mechanical Technology Incorporated Controlled stroke electrodynamic linear compressor
EP0277382A1 (fr) * 1986-12-24 1988-08-10 Whirlpool International B.V. Aggrégat moteur-compresseur
WO1988007134A1 (fr) * 1987-03-10 1988-09-22 Mechanical Technology Incorporated Moyens de stabilisation pour machines alternatives resonantes lineaires de type a piston libre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937600A (en) * 1974-05-08 1976-02-10 Mechanical Technology Incorporated Controlled stroke electrodynamic linear compressor
EP0277382A1 (fr) * 1986-12-24 1988-08-10 Whirlpool International B.V. Aggrégat moteur-compresseur
WO1988007134A1 (fr) * 1987-03-10 1988-09-22 Mechanical Technology Incorporated Moyens de stabilisation pour machines alternatives resonantes lineaires de type a piston libre

Also Published As

Publication number Publication date
NL8902806A (nl) 1991-06-03
JPH03168371A (ja) 1991-07-22

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