EP2171274A1 - Compresseur linéaire à course régulée - Google Patents

Compresseur linéaire à course régulée

Info

Publication number
EP2171274A1
EP2171274A1 EP08774910A EP08774910A EP2171274A1 EP 2171274 A1 EP2171274 A1 EP 2171274A1 EP 08774910 A EP08774910 A EP 08774910A EP 08774910 A EP08774910 A EP 08774910A EP 2171274 A1 EP2171274 A1 EP 2171274A1
Authority
EP
European Patent Office
Prior art keywords
piston
face
linear compressor
distance
amplitude
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Withdrawn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
EP08774910A
Other languages
German (de)
English (en)
Inventor
Heinz Schmidt
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2171274A1 publication Critical patent/EP2171274A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • 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
    • F04B39/0005—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 adaptations of pistons
    • F04B39/0016—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 adaptations of pistons with valve arranged in the piston
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston

Definitions

  • the present invention relates to a linear compressor, in particular for compressing refrigerant in a refrigerator.
  • a linear compressor conventionally comprises an electromagnet for generating an alternating magnetic field, a vibrating body reciprocated in the field of the electromagnet, and a piston reciprocally coupled to the vibrating body in a cylinder.
  • the stroke of the piston movement is determined by the orbit diameter of a point at which a piston rod engages the crankshaft.
  • the dead volume of the compressor can therefore be made extremely small, without a striking of the piston is to be feared at an opposite end face of the pumping chamber. Minimizing the dead volume is important to achieve high efficiency of the compressor.
  • the piston stroke may vary depending on the working conditions of the compressor.
  • Object of the present invention is to provide a linear compressor, which makes it possible with simple, inexpensive means to operate the compressor both with high efficiency and to prevent a striking of the piston to a front side opposite him reliably.
  • the object is achieved in that in a linear compressor with at least one electromagnet, at least one vibrating body oscillating in an alternating field of the electromagnet, at least one connected to the oscillating body, in a cylinder reciprocally movable piston and a power supply circuit for supplying the electromagnet with detects an AC sensor, a proximity sensor, whether the distance between the piston and an end face of the cylinder falls below a limit or not, and a control circuit detects a time interval in which the distance between the piston and the end face of the limit below the limit, and in case of deviation of these Period of a positive setpoint amplitude and / or phase of the alternating current regulates.
  • This invention is based on the recognition that the time period in which the limit value is undershot, in a clear relationship to the amplitude of the movement of the piston. In other words, it is sufficient to know this period of time in order to be able to calculate the amplitude. Conversely, if the maximum possible amplitude of the piston, that is, the distance between the piston and face of the cylinder in an equilibrium position of the piston, the limit for the distance between the piston and face and the oscillation period of the piston are set, one setpoint for the Time interval of falling below the distance limit value set, which corresponds to a desired amplitude of the piston movement. That is, by a suitable choice of the period of time, the piston movement can be controlled so that it falls below the limit of the distance, but the piston still does not hit with certainty on the end face.
  • the setpoint .DELTA.t SO ⁇ should be less than
  • the target value At 80N is smaller than 0.15T .
  • the setpoint At 80H is preferably selected larger than 0.02T .
  • the limit value ⁇ itself. On the one hand, this should be small in order to allow a precise inference to the amplitude of the piston movement. Therefore, preferably, the limit is set smaller than 1/10 of the distance between the end face and the piston in a rest position of the piston.
  • the threshold ⁇ is preferably set greater than 1/50 of said distance.
  • a non-contact sensor is preferably used as the proximity sensor, in particular an inductive switch.
  • FIG. 1 shows a schematic section through a linear compressor according to a first
  • FIG. 2 shows the time profile of the piston movement and of a proximity sensor signal derived therefrom
  • Fig. 4 is an analogous to Fig. 1 section through a linear compressor according to a second embodiment of the invention.
  • the illustrated in Fig. 1 linear compressor comprises a cylindrical tube 1, which is closed at one end by an end face 15, and an oscillatingly received in the tube 1 movably piston 2.
  • the piston 2 is cup-shaped, wherein a bottom of the cup of the End face 15 facing end face 4 of the piston forms.
  • a wall 6 of the cup is at least partially formed by a permanent magnet which interacts with an alternating magnetic field generated by a coil 7 to drive a reciprocating motion of the piston 2.
  • the coil 7 is shown here by way of example as an annular coil extending around the tube 1;
  • Various other coil arrangements are known in the field of linear compressors and also suitable in the context of the present invention. There are also coil arrangements possible, which can also drive the piston 2, if it consists only of a ferromagnetic, but not permanently magnetized material.
  • a gas to be compressed for example a refrigerant
  • An inductive proximity switch 17 is here formed by a tightly around the made of non-ferromagnetic material existing tube 1 around coil.
  • the proximity switch 17 is arranged at a small distance from the end face 15 to detect the end face 4 of the piston 2, as soon as and as long as their distance from the end face 15 falls below a specified by the placement of the proximity switch 17 limit ⁇ .
  • the output signal of the proximity switch 17 is thus a sequence of rectangular pulses whose period ensthay the period of piston movement, wherein the duration of each pulse e ⁇ n .DELTA.t is the time interval in which the limit value is exceeded ⁇ .
  • proximity switches are also useful in the invention; such as e.g.
  • the piston of the compressor of a interacting with the alternating magnetic field of the coil 7 oscillating body not shown in Fig. 1 are fused in a component, but the vibrating body is arranged outside of the tube 1 and connected to the piston, a light barrier, the detects a part of the oscillating body, serve as a proximity switch.
  • a control circuit 19 receives the output of the proximity switch 17 and controls based on this output signal, as will be described in more detail later, an alternating current, with which it acts on the coil 7.
  • Fig. 2 illustrates the time course of the movement of the piston 2 and the resulting output signal of the proximity switch 17.
  • the abscissa of the graph the time is plotted on the left ordinate, the displacement of the piston with respect to an equilibrium position denoted by 0 and at the right ordinate the output signal level of the proximity switch 17.
  • the movement of the piston follows a cosine curve 18.
  • the distance between the piston 2 and the end face 15 is 1 cm; that is, the maximum amplitude of the piston movement is 2 cm.
  • a dashed line at a distance x s of 0.95 cm corresponds to the detection threshold of the proximity switch 17; If the piston 2 is beyond this limit, then the output signal of the proximity switch has 17 the value 1; otherwise it is O. It can be shown that for the amplitude 1 stroke of a harmonic oscillation applies:
  • tei n the duration of a pulse of the output signal of the proximity switch 17 and T is the period of piston movement.
  • the duty cycle can then reach a maximum value of 0.1; The closer to this value the compressor is operated, the higher is its efficiency, but the higher is the risk that due to a Unexpected amplitude fluctuation of the piston 2 abuts the end face 15.
  • the control circuit 19 regulates the amplitude and / or period of an alternating current fed into the coil 7 on the basis of the output signal of the proximity switch 17 and a predetermined desired value for the duty cycle of this output signal, here between 0 and 0.1, for example 0 , 05, lies.
  • control circuit 19 determines that the duty cycle exceeds the setpoint value, it reduces the amplitude of the alternating current fed into the coil 7, or detunes its frequency against the resonant frequency of the piston 2 so as to reduce its amplitude of movement. If it falls below the setpoint value, it increases the amplitude of the alternating current or reduces the deviation between its frequency and the resonant frequency of the piston 2, in order to bring about more efficient vibration excitation.
  • the principle of the invention is also applicable to a linear compressor with two counter-rotating pistons 2
  • the longitudinal ends of the cylindrical tube 1 each form inlets 14 for gas to be compressed, and through valves 9 formed in the end faces 4 of the opposing pistons 2, 2 r , the gas passes into that of the tube 1 and the piston 2
  • each case the end face 4 of one of the pistons 2 h 2 r corresponds to the end face 15 of the compressor of FIG. 1, to which the end face 4 of the respective other piston 2 r can not strike.
  • To monitor the piston movement are on both sides of the median plane at a distance ⁇ from this proximity switch 17 h 17 r arranged.
  • a control circuit 19 acts on each coil 7 h 7 r with mutually in-phase AC currents I 1 , I 1 -. In this case, it regulates the amplitude of each alternating current I 1 , I 1 -as described above on the basis of the pulse duty factor t e I n / T of the output signal of the respectively assigned proximity switch 17 1 , 17 r .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention concerne un compresseur linéaire qui présente au moins un électroaimant (7), au moins un corps oscillant (2) guidé à déplacement d'oscillation dans le champ alternatif de l'électroaimant (7), au moins un piston (2) relié au corps oscillant (2) et mobile en va-et-vient dans un cylindre (1) et un circuit (19) d'alimentation en courant qui alimente l'électroaimant (7) en courant alternatif, caractérisé par un détecteur de proximité (14) qui détecte si la distance entre le piston (2) et une surface frontale (15) du cylindre (1) reste inférieure ou non à une valeur limite (ε) et par un circuit de régulation (19) qui détecte la durée (Δteιn) pendant laquelle la distance entre le piston (2) et la surface frontale (15) n'atteint pas la valeur limite (ε) et qui régule l'amplitude et/ou la phase du courant alternatif au cas où la durée (Δteιn) s'écarte d'une valeur de consigne positive.
EP08774910A 2007-07-24 2008-07-09 Compresseur linéaire à course régulée Withdrawn EP2171274A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034293A DE102007034293A1 (de) 2007-07-24 2007-07-24 Hubgeregelter Linearverdichter
PCT/EP2008/058904 WO2009013131A1 (fr) 2007-07-24 2008-07-09 Compresseur linéaire à course régulée

Publications (1)

Publication Number Publication Date
EP2171274A1 true EP2171274A1 (fr) 2010-04-07

Family

ID=39847066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08774910A Withdrawn EP2171274A1 (fr) 2007-07-24 2008-07-09 Compresseur linéaire à course régulée

Country Status (6)

Country Link
US (1) US20100183450A1 (fr)
EP (1) EP2171274A1 (fr)
CN (1) CN101755124A (fr)
DE (1) DE102007034293A1 (fr)
RU (1) RU2010103529A (fr)
WO (1) WO2009013131A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008029370A1 (de) * 2008-06-20 2009-12-24 BSH Bosch und Siemens Hausgeräte GmbH Linearverdichter
DE102010002554A1 (de) * 2010-03-03 2011-09-08 BSH Bosch und Siemens Hausgeräte GmbH Linearverdichter
BRPI1102532A2 (pt) * 2011-05-26 2013-07-02 Whirlpool Sa pistço para compressor alternativo
DE102012210347A1 (de) * 2012-06-19 2013-12-19 Hilti Aktiengesellschaft Setzgerät und Steuerungsverfahren
US10323628B2 (en) * 2013-11-07 2019-06-18 Gas Technology Institute Free piston linear motor compressor and associated systems of operation
US11466678B2 (en) 2013-11-07 2022-10-11 Gas Technology Institute Free piston linear motor compressor and associated systems of operation
US9322401B2 (en) * 2014-02-10 2016-04-26 General Electric Company Linear compressor
US9506460B2 (en) * 2014-02-10 2016-11-29 Haier Us Appliance Solutions, Inc. Linear compressor
US9518572B2 (en) * 2014-02-10 2016-12-13 Haier Us Appliance Solutions, Inc. Linear compressor
US9429150B2 (en) * 2014-02-10 2016-08-30 Haier US Appliances Solutions, Inc. Linear compressor
KR102237723B1 (ko) * 2015-10-28 2021-04-08 엘지전자 주식회사 압축기 및 압축기의 제어 방법
KR20170049277A (ko) 2015-10-28 2017-05-10 엘지전자 주식회사 압축기 및 압축기의 제어 방법
CN107101409B (zh) * 2017-05-17 2018-01-23 宁利平 双作用α型斯特林制冷机
JP2022518852A (ja) * 2019-02-05 2022-03-16 ブルクハルト コンプレッション アーゲー リニアモータコンプレッサを動作させるための方法およびリニアモータコンプレッサ

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US5342176A (en) * 1993-04-05 1994-08-30 Sunpower, Inc. Method and apparatus for measuring piston position in a free piston compressor
JPH09137781A (ja) * 1995-11-15 1997-05-27 Matsushita Refrig Co Ltd 振動型圧縮機
BR9907432B1 (pt) 1999-12-23 2014-04-22 Brasil Compressores Sa Método de controle de compressor, sistema de monitoração de posição de um pistão e compressor
BR0001404A (pt) * 2000-03-23 2001-11-13 Brasil Compressores Sa Sensor de posição e compressor
GB0008281D0 (en) * 2000-04-04 2000-05-24 Boc Group Plc Improvements in reciprocating machines
NZ515578A (en) * 2001-11-20 2004-03-26 Fisher & Paykel Appliances Ltd Reduction of power to free piston linear motor to reduce piston overshoot
KR100432219B1 (ko) * 2001-11-27 2004-05-22 삼성전자주식회사 리니어 압축기의 제어장치 및 제어방법
US7456592B2 (en) * 2003-12-17 2008-11-25 Lg Electronics Inc. Apparatus and method for controlling operation of reciprocating compressor
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BRPI0516829B1 (pt) * 2004-10-01 2017-11-21 Fisher & Paykel Appliances Limited Method of controlling the stroke of a free piston linear compressor motor and free piston linear compressor motor having a controlled stroke?

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Also Published As

Publication number Publication date
WO2009013131A1 (fr) 2009-01-29
CN101755124A (zh) 2010-06-23
RU2010103529A (ru) 2011-08-27
US20100183450A1 (en) 2010-07-22
DE102007034293A1 (de) 2009-01-29

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