CN101400893A - Control apparatus for linear compressor - Google Patents

Control apparatus for linear compressor Download PDF

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Publication number
CN101400893A
CN101400893A CNA2007800041086A CN200780004108A CN101400893A CN 101400893 A CN101400893 A CN 101400893A CN A2007800041086 A CNA2007800041086 A CN A2007800041086A CN 200780004108 A CN200780004108 A CN 200780004108A CN 101400893 A CN101400893 A CN 101400893A
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CN
China
Prior art keywords
voltage
capacitor
unit
control gear
linear compressor
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Granted
Application number
CNA2007800041086A
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Chinese (zh)
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CN101400893B (en
Inventor
卢铁基
金钟权
裴正郁
姜熙东
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LG Electronics Inc
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LG Electronics Inc
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Publication date
Priority claimed from KR1020060010269A external-priority patent/KR100756720B1/en
Priority claimed from KR1020060010266A external-priority patent/KR100783218B1/en
Priority claimed from KR1020060010267A external-priority patent/KR100756721B1/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority claimed from PCT/KR2007/000272 external-priority patent/WO2007089083A2/en
Publication of CN101400893A publication Critical patent/CN101400893A/en
Application granted granted Critical
Publication of CN101400893B publication Critical patent/CN101400893B/en
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    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/023—Compressor arrangements of motor-compressor units with compressor of reciprocating-piston type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/14—Refrigerants with particular properties, e.g. HFC-134a
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • F25B2700/151—Power, e.g. by voltage or current of the compressor motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/902—Hermetically sealed motor pump unit

Abstract

The present invention discloses a control apparatus for a linear compressor which can vary a cooling force and prevent an inrush current. The control apparatus for the linear compressor includes a coil winding body (L) laminated on the linear compressor, a first capacitor (C1) connected in series to the coil winding body, a capacitance varying unit (50) being formed in a parallel structure to the first capacitor (C1), and having a capacitor switch (SW2), and a control unit (60) for inducing an output change of the linear compressor, by varying the whole capacitance of the control apparatus by controlling the capacitor switch (SW2).

Description

The control gear that is used for linear compressor
Technical field
The present invention relates to a kind of linear compressor, more specifically, the present invention relates to a kind of control gear that is used for linear compressor that can change cooling Power and prevent to shove.
Background technique
Generally speaking, compressor is to be used for by receive the raise mechanical device of pressure of electric power and pressurized air, freezing mixture or other various working gass from electricity generating device such as motor or turbo machine.Compressor has been widely used in household electric appliance such as refrigerator and the air-conditioning, or uses in whole industrial trade.
Compressor is divided into reciprocating movement type compressor, rotary compressor and scroll compressor roughly.In reciprocating movement type compressor, between piston and cylinder barrel, be formed for sucking or discharging the compression volume of working gas, and piston in cylinder barrel point-blank to-and-fro motion with compresses refrigerant.In rotary compressor, between the roll piece of cylinder barrel and eccentric rotation, be formed for sucking or discharging the compression volume of working gas, and roll piece rotates with compresses refrigerant prejudicially along the inwall of cylinder barrel.In scroll compressor, at moving vortex with decide to be formed between the vortex sucking or discharging the compression volume of working gas, and moving vortex rotates with compresses refrigerant along deciding vortex.
Usually, linear compressor sucks, compresses and discharge freezing mixture by the linear drives power of utilizing motor, linear compressor is divided into compression unit and driver element, this compression unit comprises piston and the cylinder barrel that is used for compresses refrigerant gas, and this driver element comprises and is used to provide the linear electric motor of described driving force to compression unit.
In detail, in linear compressor, cylinder barrel is fixedly mounted in the seal container, and piston to-and-fro motion point-blank in cylinder barrel.Along with piston to-and-fro motion point-blank in cylinder barrel, freezing mixture is supplied in the interior compression volume of cylinder barrel, is compressed and is discharged from.Suction valve assembly and discharge valve assembly are installed in this compression volume, are used for controlling the suction and the discharge of freezing mixture according to the interior pressure of compression volume.
The linear electric motor that are used to produce linear drives power are connected in piston.In these linear electric motor, with predetermined gap internal stator and outer stator are installed around cylinder barrel, this internal stator and outer stator form by a plurality of laminations of lamination on circumferential direction, come winding around (or coil winding) around this internal stator or around the inside of outer stator, and in the described gap of internal stator and outer stator permanent magnet is installed, this permanent magnet is connected in piston.
Described permanent magnet can move on the moving direction of piston.The moving direction of the effect lower edge piston of the electromagnetic force that this permanent magnet is produced when electric current flows through described coil moves back and forth point-blank.Linear electric motor are with constant frequency of okperation fc work, and piston is with predetermined stroke S to-and-fro motion point-blank.
Fig. 1 is the circuit diagram that diagram is used for traditional control gear of linear compressor.With reference to Fig. 1, control gear comprises: coil winding L, and its circumferential direction along linear compressor is twined, and is used to receive electric power; Branch apparatus 100, it is used for to whole winding winding L or the energising of coil sections winding L; And control unit 200, it is used for controlling cooling Power according to load control branch apparatus 100.
In detail, the end of coil winding L is connected with power supply, forms the splicing ear 100a of branch apparatus 100 at its other end place.Splicing ear 100b is connected in the mid point M (or branch road of mid point L) of coil winding L.Branch apparatus 100 comprises switching element 100c, and switching element 100c is used for applying electric power to splicing ear 100a or 100b under the control of control unit 200.
Under the situation of freeze cycle overload, control unit 200 is carried out the power mode that applies electric power to the coil sections winding L, so that export high cooling Power, freeze cycle low carry or under the situation of carrying, control unit 200 is carried out the save mode that applies electric power to the whole winding winding L, so that low cooling Power of output or medium cooling Power.For power mode, control unit 200 is connected in splicing ear 100b with the switching element 100c of branch apparatus 100.For save mode, control unit 200 is connected in splicing ear 100a with the switching element 100c of branch apparatus 100.
In above-mentioned linear compressor, under the load that linear electric motor are considered in design with the free frequency f of piston nIdentical frequency of okperation f cWork, the free frequency f of piston nBy utilizing helical spring mechanical spring constant K mGas spring constant K with gas spring gCalculate.Therefore, in power mode, work under the load that described linear compressor is only considered in design, to raise the efficiency.
Because load is actually variable, so the gas spring constant K of gas spring gWith utilize this gas spring constant K gThe piston free frequency f that is calculated nChange.
In detail, in design, the frequency of okperation f of linear electric motor cBe set at equal piston in carry free frequency f in the scope nEven load variations, linear electric motor are also with constant frequency of okperation f cWork.Yet, the free frequency f of piston nIncrease along with the increase of load.
Formula 1
f n = 1 2 π K m + K g M
Here, f nThe free frequency of expression piston, K mAnd K gRepresent mechanical spring constant and gas spring constant respectively, and M represents the quality of piston.
In design, because the gas spring constant K gRatio in whole spring constant KT is little, so do not consider the gas spring constant K gOr it is made as has steady state value.In addition, the mass M of piston and mechanical spring constant K mHas steady state value.Therefore, calculate the free frequency f of piston by above-mentioned formula 1 nBe steady state value.
In fact, the pressure and temperature of refrigeration agent increases along with load and raises in limited space.Therefore, gas spring constant K gOwing to the increase of the elastic force of gas spring itself increases, and with the gas spring constant K gProportional piston free frequency f nAlso increase.
In the conventional art, under the situation of control unit 200 control switch element 100c, accumulate in electric energy among the coil winding L and be manipulated into to produce and shove.
If the electric power that applies changes, so this change will not considered the control of control unit 200 and change the output power of linear compressor.If electric power applies excessively, then linear compressor will stand overload or carry out abnormal operation.That is to say the linear compressor malfunction.
The traditional control gear that is used for linear compressor is not as shown in Figure 1 being considered according to the gas spring constant K gAnd free frequency f piston or movable link that changes nSituation under the Control work frequency f cPromptly allow to change the output power of linear compressor, can not keep the resonant frequency of linear compressor according to the cooling Power of load.Therefore reduced the efficient of linear compressor.In addition, because the variation of the outside electric power that applies, the efficient and the cooling Power of linear compressor change greatly.This is fatal problem in the work of linear compressor.
Summary of the invention
Technical problem
Realized that the present invention is to address the above problem.The object of the present invention is to provide a kind of control gear that is used for linear compressor, this control gear can be controlled output power by changing total capacitance, and can prevent to shove.
Technological scheme
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can prevent shoving in the electric capacity change process by the on/off switch of control linear compressor.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can prevent the increase of output power by the electric power that change is applied or reduce.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can prevent that linear compressor from excessively standing the operation of overload or execute exception owing to electric power applies.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can change the operation (operation of high cooling Power, low cooling Power operation etc.) of linear compressor, and prevents the generation of shoving.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can not considered the variation of the electric power that the outside applies and change output power according to load.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can produce a plurality of output powers by the size that change is applied to the constant electric power of coil according to desired output power.
Another object of the present invention is to provide a kind of control gear that is used for linear compressor, and this control gear can produce a plurality of output powers by size that changes constant electric power and the length that receives the coil of this constant electric power.
In order to realize above-mentioned purpose of the present invention, a kind of control gear that is used for linear compressor is provided, this control gear comprises: coil winding, it is laminated on the linear compressor; First capacitor, it is connected with described coil winding; Electric capacity changes the unit, and itself and first capacitor form parallel-connection structure and have capacitor switch; And control unit, it is used for changing by the control capacitor switch total capacitance of described control gear, causes that thus the output power of linear compressor changes.
In another aspect of the present invention, following a kind of control gear that is used for linear compressor is provided, this control gear comprises: coil winding, it is laminated on the linear compressor; First capacitor, it is connected with described coil winding; Electric capacity changes the unit, and itself and first capacitor form parallel-connection structure; The voltage sensing unit, it is used for sensing first capacitor and electric capacity and changes at least one both end voltage of unit; And control unit, its be used for by according to by the voltage sensing unit senses to the voltage mode of coming control capacitance to change the unit change the total capacitance of described control gear, cause that according to load the output power of linear compressor changes thus.
Aspect another, provide following a kind of control gear that is used for linear compressor of the present invention, this control gear comprises: coil winding, and it is laminated on the linear compressor; First capacitor, the one end is connected with described coil winding; Electric capacity changes the unit, and itself and first capacitor form parallel-connection structure; Voltage and sensation of frequency measurement unit, it is used for the voltage and the frequency of electric power that sensing applies; And control unit, it is used for causing that by the total capacitance that changes described control gear the output power of linear compressor changes, the total capacitance that changes described control gear is by being used to come computation schema voltage from the voltage of the electric power that applies of described voltage and sensation of frequency measurement unit and the function of frequency, and controls according to this mode voltage that mode that described electric capacity changes the unit realizes.
In another aspect of the present invention, provide following a kind of control gear that is used for linear compressor, this control gear comprises: coil winding, and it is laminated on the linear compressor; First capacitor, it is connected with described coil winding; Constant electric power supply unit, it is used to receive external power, this power conversions is become the constant electric power of specific size and applies this constant electric power to described coil winding; And control unit, it is used for supplying the next output power variation that causes linear compressor according to load of constant electric power of specific size to described coil winding by controlling constant electric power supply unit.
Description of drawings
Can understand the present invention better with reference to accompanying drawing.Accompanying drawing only provides in the mode of example, is not limitation of the present invention therefore, wherein:
Fig. 1 is the circuit diagram that diagram is used for traditional control gear of linear compressor;
Fig. 2 is the sectional view of diagram according to linear compressor of the present invention;
Fig. 3 is the circuit diagram of diagram according to the control gear that is used for linear compressor of first embodiment of the invention;
Fig. 4 is the circuit diagram of diagram according to the control gear that is used for linear compressor of second embodiment of the invention;
Fig. 5 is a flow chart, and it illustrates the sequential steps according to the controlling method of the control gear of Fig. 3 of first embodiment of the invention and Fig. 4;
Fig. 6 is a flow chart, and it illustrates the sequential steps according to the controlling method of the control gear of Fig. 3 of second embodiment of the invention and Fig. 4;
Fig. 7 is the circuit diagram of diagram according to the control gear that is used for linear compressor of third embodiment of the invention;
Fig. 8 is the circuit diagram of diagram according to the control gear that is used for linear compressor of four embodiment of the invention;
Fig. 9 is the flow chart of sequential steps of controlling method that the control gear of Fig. 7 and Fig. 8 is shown;
Figure 10 is the circuit diagram of diagram according to the control gear that is used for linear compressor of fifth embodiment of the invention;
Figure 11 is the circuit diagram of diagram according to the control gear that is used for linear compressor of sixth embodiment of the invention;
Figure 12 is the flow chart of sequential steps of controlling method that the control gear of Figure 10 and Figure 11 is shown;
Figure 13 is the circuit diagram of diagram according to the control gear that is used for linear compressor of seventh embodiment of the invention; And
Figure 14 is the plotted curve of cooling capacity that the control gear of Figure 13 is shown.
Embodiment
Describe the control gear that is used for linear compressor according to the preferred embodiment of the present invention in detail now with reference to accompanying drawing.
As shown in Figure 2, in linear compressor, the intake channel 2a and the outlet pipe 2b that are used to suck with discharging refrigerant are installed at a side place of seal container 2, cylinder barrel 4 is fixedly mounted in the seal container 2, piston 6 is in cylinder barrel 4 cathetus ground to-and-fro motion, be used for compressing the refrigeration agent among the compression volume P that is drawn into cylinder barrel 4, multiple spring support piston 6 flexibly on the moving direction of piston 6.Piston 6 is connected in the linear electric motor 10 that are used to produce the straight reciprocating motion driving force.
With the contacted end place of compression volume P suction valve 22 is installed at piston 6.With the contacted end place of compression volume P discharge valve assembly 24 is installed at cylinder barrel 4.Suction valve 22 and discharge valve assembly 24 are distinguished unlatching automatically and closed according to the interior pressure of compression volume P.
By connecting upper casing and lower casing hermetically seal container 2 is installed.The outlet pipe 2b that is used to suck the intake channel 2a of refrigeration agent and be used for discharging refrigerant is installed in a side of seal container 2.Piston 6 flexibly is supported on its moving direction in the cylinder barrel 4 carrying out straight reciprocating motion, and linear electric motor 10 are connected in the outer framework 18 of cylinder barrel 4, thereby forms an assembly.This assembly flexibly is supported on the inner bottom surface of seal container 2 by supported spring 29.
On the inner bottom surface of seal container 2, filled the oil of prearranging quatity.Place, bottom at described assembly is equipped with the oil pumping device 30 that is used for pump oil.Be formed with fuel supply line 18a in framework 18, this fuel supply line 18a is arranged on the place, bottom of described assembly, is used to supply oil to the gap between piston 6 and the cylinder barrel 4.Oil supplying device 30 comes work by means of the vibration of the straight reciprocating motion generation of piston 6, is used for pump oil.Oil is fed to gap between piston 6 and the cylinder barrel 4 by fuel supply line 18a, is used to cool off and lubricate.
Cylinder barrel 4 forms hollow shape, so that piston 6 can to-and-fro motion point-blank in cylinder barrel 4.Compression volume P is formed on a side place of cylinder barrel 4.Under the state of an end near the inside of intake channel 2a of cylinder barrel 4, preferably cylinder barrel 4 is installed on the straight line identical with intake channel 2a.Piston 6 is installed in the end of close intake channel 2a of cylinder barrel 4, is used to carry out straight reciprocating motion.Discharge valve assembly 24 is installed in an end place relative with intake channel 2a of cylinder barrel 4.
Discharge valve assembly 24 comprises: discharge cap 24a, and the end place that it is installed in cylinder barrel 4 is used to form and discharges the space; Expulsion valve 24b, it is used to open and close the end of the close compression volume P of cylinder barrel 4; And valve spring 24c, valve spring 24c is a kind of helical spring, it is used in axial direction applying elastic force between discharge cap 24a and expulsion valve 24b.On the interior week of cylinder barrel 4 one ends, be inserted with O shape circle, make expulsion valve 24a can closely invest an end of cylinder barrel 4.
Between the side of discharge cap 24a and outlet pipe 2b, ring pipe 28 is installed agley.The compressed refrigeration agent of ring pipe 28 guiding is discharged outside, and cushions the vibration that produces and be delivered to whole seal container 2 by the interaction of cylinder barrel 4, piston 6 and linear electric motor 10.
When piston 6 during in cylinder barrel 4 cathetus ground to-and-fro motion, if the pressure of compression volume P is higher than predetermined head pressure, then valve spring 24c is compressed to open expulsion valve 24b.After refrigeration agent was discharged from compression volume P, refrigeration agent was discharged outside fully by ring pipe 28 and outlet pipe 2b.
Center at piston 6 is formed with coolant channel 6a, makes the refrigeration agent that sucks by intake channel 2a can pass through this coolant channel 6a.Linear electric motor 10 are directly connected in the end of the close intake channel 2a of piston 6 by connector element 17, and suction valve 22 is installed in the other end place relative with intake channel 2a of piston 6.Piston 6 is supported by multiple spring ground on its moving direction.
Suction valve 22 forms thin sheet form, and partly cut to open and close the coolant channel 6a of piston 6 at the middle part of suction valve 22.One side of suction valve 22 is utilized the end of screw in piston 6.
Therefore, when piston 6 in cylinder barrel 4 point-blank during to-and-fro motion, if the pressure of compression volume P is lower than the predetermined suction pressure lower than described head pressure, then suction valve 22 is opened and refrigeration agent is fed among the compression volume P, if the pressure of compression volume P is higher than described predetermined suction pressure, then suction valve 22 cuts out and refrigeration agent is compressed in compression volume P.
Especially, piston 6 is flexibly supported on its moving direction.In detail, on the moving direction of piston 6, flexibly support by mechanical spring 8a, 8b such as helical spring from the radially outstanding piston flange 6b of the end of the close intake channel 2a of piston 6.In addition, the refrigeration agent that is filled among the compression volume P along the direction opposite with intake channel 2a act as gas spring by himself elastic force, is used for flexibly support piston 6.
Mechanical spring 8a and 8b have and the irrelevant constant mechanical spring constant K of load mPreferably, mechanical spring 8a and 8b in axial direction are installed in support frame 26 places and cylinder barrel 4 places of being fixed in linear electric motor 10 respectively, and piston flange 6b is between mechanical spring 8a and 8b.The mechanical spring 8a that is supported on the support frame 26 has identical mechanical spring constant K with mechanical spring 8b in being installed in cylinder barrel 4 m
Fig. 3 is the circuit diagram of diagram according to the control gear that is used for linear compressor of first embodiment of the invention.
Still with reference to Fig. 2, linear electric motor 100 comprise: internal stator 12, and it forms by a plurality of lamination 12a of lamination on circumferential direction, and is fixed in the outside of cylinder barrel 4 by framework 18; Outer stator 14, it is by forming around a plurality of lamination 14b of coil winding 14a lamination on circumferential direction that form in the mode of winding around, and is installed in the place, outside of cylinder barrel 4 by framework 18, with internal stator 12 predetermined gap of being separated by; And permanent magnet 16, it is arranged on the described gap location between internal stator 12 and the outer stator 14 and is connected in piston 6 by connector element 17.Coil winding 14a can be fixed in the outside of internal stator 12.
As shown in Figure 3, the described control gear that is used for linear compressor comprises: on/off switch SW 1 40, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50, and it is in parallel with capacitor C1; And control unit 60, it is used for control capacitance and changes unit 50 to change the output power of linear compressor.
In detail, on/off switch SW 1 40 is the main switches that are used under the control of control unit 60 to line motor 10 power supplies.Here, electric power refers to outside commercial electricity, or the electric power that provides from the power supply unit of equipment that linear compressor is installed (as refrigerator etc.).
Capacitor C1 and electric capacity change the total capacitance that linear electric motor 10 are determined in unit 50, and in parallel as shown in Figure 3.
Electric capacity changes unit 50 and forms by series capacitor C2, capacitor switch SW2 and inrush current prevention device 52.A plurality of electric capacity can be set change unit 50 and it is in parallel with capacitor C1.
The electric capacity of capacitor C2 is less than the electric capacity of capacitor C1.Capacitor switch SW2 is applied to coil winding L by the curtage of capacitor C2 self-supply power source in future.When control unit 60 control capacitances change unit 50, then mean the on/off of control unit 60 control capacitor switch SW 2.
Under the state of on/off switch SW 1 40 closures,, then produce the feasible electric charge that charges among the capacitor C1 and flow to shoving among the capacitor C2 at once, with the point of contact of deposited capacitor switch SW2 if capacitor switch SW2 connects.Inrush current prevention device 52 is set in order to prevent that capacitor switch SW2 is by the described damage of shoving.Therefore, inrush current prevention device 52 comprises at least one in resistor, negative temperature coefficient (NTC) device and the inductor, converting described shoving to dissimilar energy, or prevents that described shoving exceedingly is applied to capacitor switch SW2.
Control unit 60 changes the total capacitance that unit 50 changes linear electric motor by control capacitance.That is to say that control unit 60 changes the output power of linear compressor, i.e. cooling Power by the mode that changes electric capacity and utilize coil winding L to change frequency of okperation.Especially, must change the output power size of linear compressor according to load.Yet the output power of linear compressor can have nothing to do load and increase or reduce.The control operation that changes output power and prevent to shove of being used to of control unit 60 is described with reference to Fig. 5 and Fig. 6 after a while.
Fig. 4 is the circuit diagram of diagram according to the control gear that is used for linear compressor of second embodiment of the invention.
As shown in Figure 4, this control gear that is used for linear compressor comprises: on/off switch SW 140, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50a, and the one end is connected in the end of capacitor C1, and the other end is connected in the winding joint T of coil winding L, and it is in parallel with capacitor C1 that electric capacity changes unit 50a; And control unit 60, it is used for control capacitance and changes unit 50a to change the output power of linear compressor.
Here, the on/off switch SW 1 40 among Fig. 4, coil winding L and capacitor C1 have with Fig. 3 in identical reference character.
The electric capacity that forms Fig. 4 by series capacitor C3 and capacitor switch SW2 changes unit 50a.With the electric capacity of Fig. 3 change unit 50 different be that the electric capacity of Fig. 4 changes unit 50a and do not comprise inrush current prevention device 52.The other end of electric capacity change unit 50a is directly connected to the winding joint T of coil winding L, makes capacitor C1 and the coil that twines between the joint T can be used as inductor.Shove even produce, this shoves and does not also damage capacitor switch SW2.That is to say, be connected to coil winding L, just do not need the inrush current prevention device 52 of Fig. 3 by electric capacity being changed unit 50a.Therefore, reduced the occupied zone of linear electric motor 10, and reduced manufacture cost.For example, resistor 10 consumes by generating heat and shoves.Because electric current generates heat constantly at work, so the temperature of the linear electric motor 10 that can raise.In addition, when ambient temperature was high, the resistance value of negative temperature coefficient device descended and can not stop effectively and shove.In addition, because inductor is relatively large, so inductor occupies bigger zone in linear compressor.Be connected to coil winding L and can address the above problem by electric capacity being changed unit 50a.
A plurality of electric capacity can be set change unit 50a and it is in parallel with capacitor C1.Here, can use one or more winding joint T to be used for described electric capacity and change unit 50a.
Capacitor C3 capacitor C2 with Fig. 3 on element characteristic (comprising capacitance size) and function is identical.When control unit 60 control capacitances change unit 50a, then mean the on/off of control unit 60 control capacitor switch SW 2.
Control unit 60 changes the total capacitance that unit 50a changes linear electric motor 10 by control capacitance.That is to say that control unit 60 changes the output power of linear compressor, i.e. cooling Power by the mode that changes electric capacity and utilize coil winding L to change frequency of okperation.Especially, must change the output power size of linear compressor according to load.Yet the output power of linear compressor can have nothing to do load and increase or reduce.Be used to change the control operation that output power and preventing is shoved now with reference to what Fig. 5 and Fig. 6 illustrated control unit 60.
Fig. 5 is a flow chart, and it illustrates the sequential steps according to the controlling method of the control gear of Fig. 3 of first embodiment of the invention and Fig. 4.In the starting stage, control unit 60 closed on/off switch SW 1 40 make linear compressor can produce intended power output with to coil winding L and capacitor C1 energising.
In step S51, control unit 60 judges whether linear compressor needs to produce additional cooling Power.As mentioned above, can be according to load or irrelevant load and the needs cooling Power.Can both suitably make such judgement in each case.Described if desired cooling Power (high if desired cooling Power control), then program forwards step S52 to, if do not need described cooling Power (if do not need high cooling Power control, if promptly keep low cooling Power control, begin low cooling Power control if perhaps finish current high cooling Power control), then program forwards step S55 to.
In step S52, control unit 60 disconnects (opening) on/off switch SW 1 40.Control unit 60 is kept this off state the scheduled time (for example, several seconds kinds), makes it possible to consume to a certain extent the electric charge that charges among the capacitor C1.
In step S53, control unit 60 changes unit 50 by control capacitance or 50a connects (closure) capacitor switch SW2.Control unit 60 can be kept this on-state (SW1 disconnects and the SW2 connection), makes the electric charge that has charged among the capacitor C1 almost all to consume.This consumption is to realize by the coil sections of inrush current prevention device 52 or coil winding L.
In step S54, control unit 60 is connected (closure) on/off switch SW 1 40, to change unit 50 or 50a (being capacitor C2 or C3) energising to capacitor C1 and electric capacity.When total capacitance raises, carry out high cooling Power operation.
Whether in step S55, control unit 60 is judged current whether connection of capacitor switch SW2, promptly closed.If capacitor switch SW2 is (if current carrying out high cooling Power operation) of connecting, then program forwards step S56 to, if capacitor switch SW2 access failure, EOP end of program then, and the low cooling Power operation that keeps current is constant.
In step S57, control unit 60 disconnects on/off switch SW 1 40.Control unit 60 can be as keeping the scheduled time with this off state among the step S52.If control unit 60 skips steps S57 and execution in step S58, then by charge among capacitor C2 or the C3 electric charge produced shoves and can flow in the on/off switch SW 1 40 and damage on/off switch SW 1 40.Therefore, step S57 is necessary.
In step S58, control unit 60 disconnects (opening) capacitor switch SW2.Control unit 60 is kept the scheduled time with this off state, make charged into the electric charge among capacitor C1 and/or capacitor C2 or the C3, the electric charge that has charged among capacitor C2 or the C3 especially can be consumed.
In step S59, control unit 60 is connected on/off switch SW 1 40, to apply electric power through capacitor C1 and coil winding L.When total capacitance reduces, carry out low cooling Power operation.
According to the controlling method of first embodiment of the invention, control unit 60 disconnected on/off switch SW 1 40 before changing total capacitance by control capacitance change unit 50 or 50a.Therefore, except the inrush current prevention structure of Fig. 3 and Fig. 4, control unit 60 has also prevented other shoving.
Fig. 6 is a flow chart, and it illustrates the sequential steps according to the controlling method of the control gear of Fig. 3 of second embodiment of the invention and Fig. 4.
In step S61, control unit 60 judges whether stop to carry out high cooling Power operation or hang down the linear compressor of cooling Power operation.Here, control unit 60 perhaps stops the operation of linear compressor according to the operation that stops linear compressor from the order of the equipment that linear compressor has been installed when cooling Power is sufficient.If control unit 60 wants to stop the operation of linear compressor, then program forwards step S62 to, if control unit 60 wants to keep the current operation of linear compressor, then EOP end of program.
In step S62, control unit 60 disconnects on/off switch SW 1 40, thereby no longer to coil winding L and capacitor C1 and/or capacitor C2 or C3 energising, makes the electric charge that has charged among capacitor C1 and/or capacitor C2 or the C3 to be consumed.Control unit 60 is kept the scheduled time with the off state of on/off switch SW 1 40.
In step S63, control unit 60 judges whether capacitor switch SW2 connects.If capacitor switch SW2 is (if current execution is high cooling Power operation) of connecting, then program forwards step S64 to, if capacitor switch SW2 access failure (if current execution is low cooling Power operation), then EOP end of program.
In step S64, control unit 60 disconnects capacitor switch SW2, makes the electric charge that has charged among capacitor C2 or C3 and/or the capacitor C1 to be consumed.
As mentioned above, stop at control unit 60 under the situation of operation of linear compressor, the control unit 60 preferential on/off switch SW 1 40 that disconnect disconnect capacitor switch SW2 then, thereby prevent the damage of being shoved of switch SW 2 or switch SW 1.
Fig. 7 is the circuit diagram of diagram according to the control gear that is used for linear compressor of third embodiment of the invention.Illustrated in Fig. 7, the described control gear that is used for linear compressor comprises: on/off switch SW 1 40, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50, and it is in parallel with capacitor C1; Voltage sensing unit 61 and 62, it is used for capacitor sensor C1 and capacitor C2 (or electric capacity changes unit 50) both end voltage Vc1 and Vc2 separately; And control unit 70, it is used for control capacitance and changes unit 50 to change the output power of linear compressor.
Here, the on/off switch SW 1 40 among Fig. 7, coil winding L, capacitor C1 and electric capacity change unit 50 have with Fig. 3 in identical reference character.
When connecting described on/off switch SW 1 40, the both end voltage Vc1 of voltage sensing unit 61 capacitor sensor C1.When connecting described on/off switch SW 1 40 and capacitor switch SW2, the both end voltage of voltage sensing unit 62 capacitor sensor C2 or electric capacity change the both end voltage Vc2 of unit 50.If change the electric power that is applied to linear electric motor 10, then the voltage of this power transformation power will directly influence the both end voltage Vc1 of capacitor C1 and the both end voltage Vc2 of capacitor C2 or electric capacity change unit 50.Can accurately check the change degree of the electric power that is applied by described voltage Vc1 of sensing and Vc2.As mentioned above, because the electric capacity of the capacity ratio capacitor C2 of capacitor C1 is big, so can service voltage Vc1.The both end voltage Vc2 that electric capacity changes unit 50 also can use.
Control unit 70 changes the total capacitance that unit 50 changes linear electric motor 10 by control capacitance.That is to say that control unit 70 changes the output power of linear compressor, i.e. cooling Power by the mode that changes electric capacity and utilize coil winding L to change frequency of okperation.Especially, control unit 70 is discerned the change degree of the electric power that is applied by voltage sensing unit 61 and 62.If the voltage Vc of institute's sensing (comprising at least one among Vc1 and the Vc2) reduces (particularly in low cooling Power operation), then output power reduces.Require high cooling Power to operate and keep current output power.Therefore, control unit 70 is carried out high cooling Power operation.If the voltage Vc of institute's sensing raises (particularly in high cooling Power operation), then output power increases.Require low cooling Power to operate and keep present output power.Therefore, control unit 70 is carried out low cooling Power operation.Be used to change the control operation that output power and preventing is shoved with reference to what Fig. 9 illustrated control unit 70 after a while.
Fig. 8 is the circuit diagram of diagram according to the control gear that is used for linear compressor of four embodiment of the invention.With reference to Fig. 8, linear electric motor 10 (control gear that promptly is used for linear compressor) comprising: on/off switch SW 1 40, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50a, and the one end is connected with the end of capacitor C1, and the other end is connected in the winding joint T of coil winding L, and it is in parallel with capacitor C1 that electric capacity changes unit 50a; Voltage sensing unit 61 and 63, it is used for capacitor sensor C1 and capacitor C3 (or electric capacity changes unit 50a) both end voltage Vc1 and Vc3 separately; And control unit 70, it is used for control capacitance and changes unit 50a to change the output power of linear compressor.
Here, the on/off switch SW 1 40 among Fig. 8, coil winding L, capacitor C1 and electric capacity change unit 50a have with Fig. 4 in identical reference character.
When connecting described on/off switch SW 1 40, the both end voltage Vc1 of voltage sensing unit 61 capacitor sensor C1.When connecting described on/off switch SW 1 40 and capacitor switch SW2, the both end voltage of voltage sensing unit 63 capacitor sensor C3 or electric capacity change the both end voltage Vc3 of unit 50a.When the electric power that is applied to linear electric motor 10 changes, then the voltage of this power transformation power will directly influence the both end voltage Vc1 of capacitor C1 and the both end voltage Vc3 of capacitor C3 or electric capacity change unit 50a.Can accurately check the change degree of the electric power that is applied by described voltage Vc1 of sensing and Vc3.As mentioned above, because the electric capacity of the capacity ratio capacitor C3 of capacitor C1 is big, so can service voltage Vc1.The both end voltage Vc3 that electric capacity changes unit 50a or capacitor C3 also can use.
Control unit 70 changes the total capacitance that unit 50a changes linear electric motor 10 by control capacitance.That is to say that control unit 70 changes the output power of linear compressor, i.e. cooling Power by the mode that changes electric capacity and utilize coil winding L to change frequency of okperation.Especially, control unit 70 is discerned the change degree of the electric power that is applied by voltage sensing unit 61 and 63.If the voltage Vc of institute's sensing (comprising at least one among Vc1 and the Vc3) reduces (particularly in low cooling Power operation), then output power reduces.Require high cooling Power to operate and keep current output power.Therefore, control unit 70 is carried out high cooling Power operation.If the voltage Vc of institute's sensing raises (particularly in high cooling Power operation), then output power increases.Require low cooling Power to operate and keep present output power.Therefore, control unit 70 is carried out low cooling Power operation.Be used to change the control operation that output power and preventing is shoved now with reference to what Fig. 9 illustrated control unit 70.
Fig. 9 is the flow chart of sequential steps of controlling method that the control gear of Fig. 7 and Fig. 8 is shown.
In the starting stage, control unit 70 closed on/off switch SW 1 40 make linear compressor can produce intended power output with to coil winding L and capacitor C1 energising.Hereinafter, suppose that control unit 70 uses the both end voltage Vc1 of capacitor C1 as described voltage Vc.
In step S71, control unit 70 is from the both end voltage Vc of voltage sensing unit 61 receiving condenser C1, and this both end voltage Vc and overload voltage Vo are made comparisons.Overload voltage Vo is the pre-stored values of control unit 70.Overload voltage Vo represents that linear compressor can bear overload or execute exception operation, and overload voltage Vo can influence the Vc value of the electric power that is applying.Therefore, control unit 70 is made comparisons voltage Vc and overload voltage Vo.If voltage Vc is lower than overload voltage Vo, then program forwards step S72 to, if voltage Vc is equal to or higher than overload voltage Vo, then program forwards step S80 to, with the electric power that interrupts being applied.
In step S72, control unit 70 checks whether the electric power that is applied to linear compressor changes, and carries out the operation that is used for keeping at step S73 to S79 subsequently current cooling Power.Here, reference voltage V r and voltage Vc are made comparisons.Reference voltage V r refers to and makes control unit 70 can stably carry out the voltage that the best size of cooling Power operation was operated and hanged down to high cooling Power.Become from 187V under the situation of 250V at the electric power that is applied, then this reference voltage V r is set to and has a value, 220V for example, or be set in prespecified range (200V to 240V).In step S72, if voltage Vc is lower than reference voltage V r, then output power reduces.In order to address this problem, control unit 70 forwards step S73 to, is used to carry out high cooling Power operation.If voltage Vc is equal to or higher than reference voltage V r, then output power increases.In order to prevent that output power from increasing, control unit 70 forwards step S76 to, is used to hang down the cooling Power operation.
In step S73, control unit 70 disconnects (opening) on/off switch SW 1 40.Control unit 70 is kept this off state the scheduled time (for example, several seconds), makes it possible to consume to a certain extent the electric charge that charges among the capacitor C1.
In step S74, control unit 70 changes unit 50 by control capacitance or 50a connects (closure) capacitor switch SW2.Control unit 60 is kept this on-state (SW1 disconnects and the SW2 connection), makes the electric charge that has charged among the capacitor C1 almost all to be consumed.This consumption is to realize by the coil sections of inrush current prevention device 52 or coil winding L.
In step S75, control unit 70 is connected (closure) on/off switch SW 1 40, to change unit 50 or 50a (being capacitor C2 or C3) energising to capacitor C1 and electric capacity.When total capacitance raises, carry out high cooling Power operation.
Whether in step S76, control unit 70 is judged current whether connection of capacitor switch SW2, promptly closed.If capacitor switch SW2 is (if current execution is high cooling Power operation) of connecting, then program forwards step S77 to, if capacitor switch SW2 access failure, EOP end of program then, and the low cooling Power operation that keeps current is constant.
In step S77, control unit 60 disconnects on/off switch SW 1 40.Control unit 70 can be as keeping the scheduled time with this off state among the step S73.If control unit 70 skips steps S77 and execution in step S78, then by charge among the capacitor C2 electric charge produced shoves and can flow in the on/off switch SW 1 40 and damage on/off switch SW 1 40.Therefore, step S77 is necessary.
In step S78, control unit 70 disconnects (opening) capacitor switch SW2.Control unit 70 is kept the scheduled time with this open mode, make charged into the electric charge among capacitor C1 and/or capacitor C2 or the C3, the electric charge that has charged among capacitor C2 or the C3 especially can be consumed.Change under the situation of unit 50 or 50a parallel connection at described a plurality of electric capacity, control unit 70 is opened or closed each capacitor switch SW2, thereby changes electric capacity in a different manner.
Among the step S79, control unit 70 is connected (closure) on/off switch SW 1 40, to apply electric power through capacitor C1 and coil winding L.When total capacitance reduces, carry out low cooling Power operation.
In step S80, control unit 70 disconnects on/off switch SW 1 40, thereby no longer to coil winding L and capacitor C1 and/or capacitor C2 or C3 energising, makes the electric charge that has charged among capacitor C1 and/or capacitor C2 or the C3 to be consumed.Control unit 70 is kept the scheduled time with the off state of on/off switch SW 1 40.
In step S81, control unit 70 judges whether capacitor switch SW2 connects.If capacitor switch SW2 is (if current execution is high cooling Power operation) of connecting, then program forwards step S82 to, if capacitor switch SW2 access failure (if current execution is low cooling Power operation), then EOP end of program.
In step S82, control unit 70 disconnects capacitor switch SW2, makes the electric charge that has charged among capacitor C2 or C3 and/or the capacitor C1 to consume.
According to above-mentioned controlling method of the present invention, control unit 70 disconnected on/off switch SW 1 40 change unit 50 or 50a change total capacitance by control capacitance before.Therefore, except the inrush current prevention structure of Fig. 7 and Fig. 8, control unit 70 has also prevented other shoving.
Stop at control unit 70 under the situation of operation of linear compressor, the control unit 70 preferential on/off switch SW 1 40 that disconnect disconnect capacitor switch SW2 then, thereby prevent the damage of being shoved of switch SW 2 or switch SW 1.
Figure 10 is the circuit diagram of diagram according to the control gear that is used for linear compressor of fifth embodiment of the invention.As shown in figure 10, the described control gear that is used for linear compressor comprises: on/off switch SW 140, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50, and it is in parallel with capacitor C1; Voltage sensing unit 61 and 62, it is used for capacitor sensor C1 and capacitor C2 (or electric capacity changes unit 50) both end voltage Vc1 and Vc2 separately; Voltage and sensation of frequency measurement unit 65, it is used for the voltage Vi and the frequency Fi of the electric power that sensing applies; And control unit 80, it is used for control capacitance and changes unit 50 to change the output power of linear compressor.
Here, the on/off switch SW 1 40 among Figure 10, coil winding L, capacitor C1, electric capacity change unit 50 and voltage sensing unit 61 and 62 have with Fig. 7 in identical reference character.
The voltage Vi and the frequency Fi of the electric power that voltage and sensation of frequency measurement unit 65 sensings are applied.Here, voltage Vi and frequency Fi are the factors that directly influences the output power of linear compressor.Consider described voltage Vi and frequency Fi, the change degree that voltage and sensation of frequency measurement unit 65 are judged electric power must be set.
Control unit 80 changes the total capacitance that unit 50 changes linear electric motor 10 by control capacitance.That is to say that control unit 80 changes the output power of linear compressor, i.e. cooling Power by the mode that changes electric capacity and utilize coil winding L to change frequency of okperation.
Especially, the change degree of the electric power that applies in order to judge, control unit 80 comes computation schema voltage Vm by the function that will include in as the factor from the voltage Vi and the frequency Fi of voltage and sensation of frequency measurement unit 65, and this mode voltage Vm and predetermined reference value a (a is a constant) are made comparisons.That is to say that the function by voltage Vi and frequency Fi comes computation schema voltage Vm.Voltage Vi and frequency Fi are that the influence of linear motor output power is that influence degree may be different to cooling Power.Therefore, it is irrational voltage Vi and frequency Fi being made comparisons with reference potential and reference frequency respectively.Multiple function such as linear function and quadratic function can both be used as the function that is used for computation schema voltage Vm, so that accurately show these influence degrees.In the present embodiment, mode voltage Vm represents with following formula 2.
Formula 2
Vm＝Vi+(Fi-b)×a
Here, a and b are the constants with pre-sizing.
In addition, control unit 80 is discerned the change degree of the electric power that is applied by voltage sensing unit 61 and 62.If the voltage Vc of institute's sensing (comprising at least one among Vc1 and the Vc2) is lower than overload voltage Vo, then control unit 80 is kept present output power.If the voltage Vc of institute's sensing is equal to or higher than overload voltage Vo, then control unit 80 is stopped power supply to overcome overload.Be used to change the control operation that output power and preventing is shoved with reference to what Figure 12 illustrated control unit 80 after a while.
Figure 11 is the circuit diagram of diagram according to the control gear that is used for linear compressor of sixth embodiment of the invention.Illustrated in Figure 11, the described control gear that is used for linear compressor comprises: on/off switch SW 1 40, and it is used to receive electric power and powers to linear electric motor 10; The coil winding L (identical) that twines along the circumferential direction of linear compressor with the coil winding 14a of Fig. 2; Capacitor C1, it is connected with coil winding L; Electric capacity changes unit 50a, and the one end is connected with the end of capacitor C1, and the other end is connected in the winding joint T of coil winding L, and it is in parallel with capacitor C1 that electric capacity changes unit 50a; Voltage sensing unit 61 and 63, it is used for capacitor sensor C1 and capacitor C3 (or electric capacity changes unit 50a) both end voltage Vc1 and Vc3 separately; Voltage and sensation of frequency measurement unit 65, it is used for the voltage Vi and the frequency Fi of the electric power that sensing applies; And control unit 80, it is used for control capacitance and changes unit 50a to change the output power of linear compressor.
Here, the on/off switch SW 1 40 among Figure 11, coil winding L, capacitor C1, electric capacity change unit 50a and voltage sensing unit 61 and 63 have with Fig. 8 in identical reference character.
The voltage of Figure 11 is identical with sensation of frequency measurement unit 65 with the voltage of Figure 10 with sensation of frequency measurement unit 65.
The control unit 80 identical and operations in the same way of described control unit 80 and Figure 10.But this control unit 80 uses is not the voltage sensing unit 62 of Figure 10 but the voltage Vc3 of 63 sensings in voltage sensing unit.That is to say that this control unit 80 is discerned the change degree of the electric power that is applied by voltage sensing unit 61 or 63.If the voltage Vc of institute's sensing (comprising at least one among Vc1 and the Vc3) is lower than overload voltage Vo, then control unit 80 is kept present output power.If the voltage Vc of institute's sensing is equal to or higher than overload voltage Vo, then control unit 80 is stopped power supply to overcome overload.Be used to change the control operation that output power and preventing is shoved now with reference to what Figure 12 illustrated control unit 80.
Figure 12 is the flow chart of sequential steps of controlling method that the control gear of Figure 10 and Figure 11 is shown.
In the starting stage, control unit 80 closed on/off switch SW 1 40 make linear compressor can produce intended power output with to coil winding L and capacitor C1 energising.Hereinafter, suppose that control unit 80 uses the both end voltage Vc1 of capacitor C1 as described voltage Vc.
In step S91, control unit 80 is 61 reception both end voltage Vc from the voltage sensing unit, and this both end voltage Vc and overload voltage Vo are made comparisons.Overload voltage Vo is the pre-stored values of control unit 80.Overload voltage Vo represents that linear compressor can bear overload or execute exception operation, and overload voltage Vo can influence the Vc value of the electric power that is applying.Therefore, control unit 80 is made comparisons voltage Vc and overload voltage Vo.If voltage Vc is lower than overload voltage Vo, then program forwards step S92 to, if voltage Vc is equal to or higher than overload voltage Vo, then program forwards step S100 to, with the electric power that interrupts being applied.
In step S92, control unit 80 checks whether the electric power that is applied to linear compressor changes, and carries out the operation that is used for keeping at step S93 to S99 subsequently current cooling Power.Here, reference value a and mode voltage Vm are made comparisons.Reference value a refers to and makes control unit 80 can stably carry out the optimum value that the cooling Power operation was operated and hanged down to high cooling Power.This reference value a can be set to has a value, or is set in prespecified range.In step S92, if mode voltage Vm less than reference value a, then output power reduces.In order to address this problem, control unit 80 forwards step S93 to, is used to carry out high cooling Power operation.If mode voltage Vm is equal to or greater than reference value a, then output power increases.In order to prevent that output power from increasing, control unit 80 forwards step S96 to, is used to hang down the cooling Power operation.
In step S93, control unit 80 disconnects (opening) on/off switch SW 1 40.Control unit 80 is kept this off state the scheduled time (for example, several seconds), makes it possible to consume to a certain extent the electric charge that charges among the capacitor C1.
In step S94, control unit 80 changes unit 50 by control capacitance or 50a connects (closure) capacitor switch SW2.Control unit is kept this on-state (SW1 disconnects and the SW2 connection), makes the electric charge that has charged among the capacitor C1 almost all to be consumed.This consumption is to realize by the coil sections of inrush current prevention device 52 or coil winding L.
In step S95, control unit 80 is connected (closure) on/off switch SW 1 40, to change unit 50 or 50a (being capacitor C2 or C3) energising to capacitor C1 and electric capacity.When total capacitance raises, carry out high cooling Power operation.
Whether in step S96, control unit 80 is judged current whether connection of capacitor switch SW2, promptly closed.If capacitor switch SW2 is (if current execution is high cooling Power operation) of connecting, then program forwards step S97 to, if capacitor switch SW2 access failure, EOP end of program then, and the low cooling Power operation that keeps current is constant.
In step S97, control unit 80 disconnects on/off switch SW 1 40.Control unit 80 can be as keeping the scheduled time with this off state among the step S93.If control unit 80 skips steps S97 also carry out S98, then can flow in the on/off switch SW 1 40 and damage on/off switch SW 1 40 by charging into shoving of charge generation among the capacitor C2.Therefore, step S97 is necessary.
In step S98, control unit 80 disconnects (opening) capacitor switch SW2.Control unit 80 is kept the scheduled time with this off state, make charged into the electric charge among capacitor C1 and/or capacitor C2 or the C3, the electric charge that has charged among capacitor C2 or the C3 especially can be consumed.Change under the situation of unit 50 or 50a parallel connection at described a plurality of electric capacity, control unit 80 is opened or closed each capacitor switch SW2, thereby changes electric capacity in a different manner.
In step S99, control unit 80 is connected (closure) on/off switch SW 1 40, to apply electric power through capacitor C1 and coil winding L.When total capacitance reduces, carry out low cooling Power operation.
In step S100, control unit 80 disconnects on/off switch SW 1 40, thereby no longer to coil winding L and capacitor C1 and/or capacitor C2 or C3 energising, makes the electric charge that has charged among capacitor C1 and/or capacitor C2 or the C3 to be consumed.Control unit 80 is kept the scheduled time with the off state of on/off switch SW 1 40.
In step S101, control unit 80 judges whether capacitor switch SW2 connects.If capacitor switch SW2 is (if current execution is high cooling Power operation) of connecting, then program forwards step S102 to, if capacitor switch SW2 access failure (if current execution is low cooling Power operation), then EOP end of program.
In step S102, control unit 80 disconnects capacitor switch SW2, makes the electric charge that has charged among capacitor C2 or C3 and/or the capacitor C1 to be consumed.
According to above-mentioned controlling method of the present invention, control unit 80 disconnected on/off switch SW 1 40 change unit 50 or 50a change total capacitance by control capacitance before.Therefore, except the inrush current prevention structure of Figure 10 and Figure 11, control unit 80 has also prevented other shoving.
Stop at control unit 80 under the situation of operation of linear compressor, the control unit 80 preferential on/off switch SW 1 40 that disconnect disconnect capacitor switch SW2 then, thereby prevent the damage of being shoved of switch SW 2 or switch SW 1.
Figure 13 is the circuit diagram of diagram according to the control gear that is used for linear compressor of seventh embodiment of the invention.With reference to Figure 13, the described control gear that is used for linear compressor comprises: constant electric power supply unit 66, and it is used to receive external power and this power conversions is become constant electric power; Along the coil winding L (identical with the coil winding 14a of Fig. 2) that the circumferential direction of linear compressor is twined, it is used to receive described constant electric power so that change inductance in a different manner; Capacitor C, it is connected with coil winding L, is used to receive described constant electric power; Branch apparatus 55, it is used for to whole winding winding L or the energising of coil sections winding L; And control unit 90, it is used to control constant electric power supply unit 66 and branch apparatus 55, with according to the load regulation cooling Power.
In detail, constant electric power supply unit 66 receives the external power that might change, and to capacitor C and coil winding L apply the constant voltage with pre-sizing constant electric power, have pre-sizing constant frequency constant electric power or have the constant voltage of pre-sizing and the constant electric power of the constant frequency of pre-sizing.Constant electric power supply unit 66 can be configured such that circuit with transducer or triac.
Here, the size of constant voltage and the size of constant frequency are fixed as single numerical value respectively, the constant voltage that makes constant electric power supply unit 66 always can apply to have identical size and/or the constant electric power of constant frequency.In addition, constant electric power supply unit 66 power conversions that can will apply from the outside by the control of control unit 90 becomes to have the constant voltages of different sizes and/or the constant electric power of constant frequency.Constant electric power supply unit 66 prevents output power because the variation of the described external power that might change changes by apply described constant electric power to capacitor C and coil winding L, and by according to load (for example lowly carry, in carry, high carrying and overload etc.) automatically the to-and-fro motion stroke of control piston 6 cause above-mentioned natural output power variation.That is to say, when the to-and-fro motion stroke of piston 6 during low carrying with piston 6 the to-and-fro motion stroke during in overload will not realize described natural output power variation simultaneously.Especially, piston 6 preferably reciprocates to top dead center (TDC) when overload.
The capacitor C that receives constant electric power is connected in the end of coil winding L, is formed with the splicing ear 55c of branch apparatus 55 at the other end place of coil winding L.Be connected with splicing ear 55b at the mid point M of coil winding L (or branch road of mid point M).
Capacitor C is the circuit work frequency f that is used for determining with coil winding L control gear cIntrinsic element.Here, the size of coil winding L and capacitor C must be designed so that frequency of okperation f cCan equal the free frequency f of linear electric motor 10 under maximum output (for example overload operation) situation n(point of resonance design).By with mechanical spring constant K m and gas spring constant K gInclude consideration in, perhaps by reducing mechanical spring constant K m and increasing the gas spring constant K gInfluence estimate free frequency f nBy this design, under the load that requires maximum output, the piston 6 of linear electric motor 10 reciprocates to the top dead center of Fig. 2, and under the load that is lower than maximum output, and the piston 6 of linear electric motor 10 is according to load and to-and-fro motion.
Branch apparatus 55 comprises switching element 55a and splicing ear 55b and 55c (or twining joint).Switching element 55a is connected in constant electric power supply unit 66, is used for optionally applying constant electric power to splicing ear 55b or 55c.Splicing ear 55b and 55c (or twining joint) are connected to the mid point and the other end of coil winding L, are used for applying constant electric power by being connected in switching element 55a to coil winding L.Branch apparatus 55 applies constant electric power by the selection signal operation switching element 55a according to control unit 90 to whole winding winding L or coil sections winding L.Here, two or more splicing ears 55b and 55c can be set.In the starting stage, the switching element 55a of branch apparatus 55 is connected in splicing ear 55c.
The constant electric power supply unit 66 of the preferential control of control unit 90 receive external powers, with this power conversions become pre-sizing constant electric power, and should be applied to capacitor C and coil winding L by constant electric power.Therefore, linear electric motor 10 can automatically change the output of piston 6 according to load.
Clearly show that in Figure 14 described automatic output changes, Figure 14 is the cooling capacity plotted curve of the control gear of Figure 13.This cooling capacity plotted curve illustrate cooling capacity with such as low carry (a), in carry (b), the high variation of carrying (c) and transshipping (d) even load (temperature, ambient temperature etc.).Especially, the overload (d) afterwards cooling capacity have almost constant size.As mentioned above, piston 6 reciprocates to top dead center under overload situations, under the load that is lower than overload (d) with corresponding stroke reciprocating.Except automatic output changes, even external power changes because what apply is the constant electric power of pre-sizing, thus the cooling capacity plotted curve of Figure 14 can change lentamente, stably to drive cool cycles.Except automatic output change and stable cool cycles because the circuit work frequency f of control gear cEqual the free frequency f under maximum output (overload) situation nSo piston 6 reciprocates to top dead center under the situation of maximum output, thereby make the cooling effectiveness maximization.In traditional linear compressor, because power circuit frequency of okperation f cEqual the free frequency f under the high capacity output power situation nSo cooling capacity reduces under maximum output (overload) situation.
Control unit 90 can change cooling capacity according to desired output power.Here, desired output power means by cool cycles or by desired all output powers of user and changes.The first method that is used to change cooling capacity is controlled constant electric power supply unit 66, is used to change the second method control branch apparatus 55 of cooling capacity.
Be used for changing the size of the first method change of cooling capacity at the constant electric power of constant electric power supply unit 66 conversions.For example, in order to increase output power, control unit 90 increases the constant electric power of conversion in constant electric power supply unit 66, or reduces constant frequency.When output power increases, the plotted curve of Figure 14 move up (gradient of this plotted curve can change).In order to reduce output power, control unit 90 reduces the constant electric power of conversion in constant electric power supply unit 66, or increases constant frequency.When output power reduced, the plotted curve of Figure 14 moved down (gradient of this plotted curve can change).In another case, control unit 90 increases constant frequencies increasing the output power in the initial cooling down operation, and reduces constant frequency to reduce described output power.
Be used to change the length that the second method of cooling capacity is regulated the coil winding L that receives constant electric power by control branch apparatus 55.When the switching element 55a of branch apparatus 55 is connected to splicing ear 55c, obtain the plotted curve of Figure 14.If when control unit 90 was connected to splicing ear 55b by control branch apparatus 55 with switching element 55a, constant electric power only was applied to the L1 part of coil winding L, thereby reduces output power.Therefore, the plotted curve of Figure 14 moves down (gradient of this plotted curve can change).That is to say, if receiving the length of the coil winding L of constant electric power increases, then constant electric power is applied to the whole winding winding L to increase output power, reduce if receive the length of the coil winding L of constant electric power, then constant electric power is applied to the described part of coil winding L to reduce output power.
Described first method and second method can be changed to realize multiple output power by control unit 90 independent or merging enforcements.
As discussed previously, according to the present invention, the described control gear that is used for linear compressor can be controlled output power by changing total capacitance, and can prevent to shove.
The described control gear that is used for linear compressor can change electric capacity by the on/off switch of control linear compressor, and then effectively prevents to shove.
The linear electric motor or the control gear that comprise a plurality of switches can come in proper order to prevent from effectively to shove by the on/off of controlling these switches.
The described control gear that is used for linear compressor can prevent the increase of output power or reduce to improve the reliability of operation by the variation that utilizes the electric power that is applied.
The described control gear that is used for linear compressor can prevent that linear compressor is owing to the electric power that excessively applies bears overload or execute exception operation.
The described control gear that is used for linear compressor can change the operation (operation of high cooling Power, low cooling Power operation etc.) of linear compressor, and can prevent to produce and shove.
The described control gear that the is used for linear compressor outside that can have nothing to do applies the variation of electric power and makes the cooling effectiveness maximization by the mode that changes output power according to load.
The described control gear that is used for linear compressor can produce a plurality of output powers by the size that change is applied to the constant electric power of coil according to desired output power.
The described control gear that is used for linear compressor can be by the constant electric power that changes size and the length that receives the coil of this constant electric power produce a plurality of output powers.
The described control gear that is used for linear compressor can make reciprocating motion of the pistons to top dead center by use constant electric power and point of resonance design under the maximum output situation, and then improves cooling capacity and cooling effectiveness by making piston reciprocate to top dead center under the maximum output situation.
With reference to description of drawings the described linear compressor that comprises piston and moving magnet type linear electric motor, described piston is connected in described linear electric motor and in the ground to-and-fro motion of cylinder barrel cathetus, is used for sucking, compression and discharging refrigerant.Although described preferred implementation of the present invention, should be understood that the present invention should not be limited to these preferred implementations, those skilled in the art can realize various changes and remodeling in desired the spirit and scope of the present invention.

Claims (22)

1. control gear that is used for linear compressor comprises:
Be laminated to the coil winding on the described linear compressor;
First capacitor of connecting with described coil winding;
Electric capacity changes the unit, and it forms the parallel-connection structure of described first capacitor, and has capacitor switch; And
Control unit, it is used for by controlling the total capacitance that described capacitor switch changes described control gear, causes that thus the output power of described linear compressor changes.
2. control gear as claimed in claim 1, wherein, described electric capacity changes the unit and comprises at least one second capacitor, and described capacitor switch is connected between the winding joint of described second capacitor and described coil winding, is used to control electric current.
3. control gear as claimed in claim 1, wherein, described electric capacity changes the unit and comprises inrush current prevention device and at least one the 3rd capacitor, and described capacitor switch is connected between described the 3rd capacitor and first capacitor, is used to control electric current.
4. control gear as claimed in claim 3, wherein, described inrush current prevention device comprises at least one in resistor, negative temperature coefficient device and the inductor.
5. control gear as claimed in claim 1 comprises the voltage sensing unit, and described voltage sensing unit is used for described first capacitor of sensing and described electric capacity and changes at least one both end voltage of unit.
6. control gear as claimed in claim 5, wherein, described control unit is controlled described capacitor switch according to the voltage of described voltage sensing unit institute sensing.
7. control gear as claimed in claim 1 comprises the voltage that is used for the electric power that sensing applies and the voltage and the sensation of frequency measurement unit of frequency.
8. control gear as claimed in claim 7, wherein, described control unit is by coming computation schema voltage from the voltage of described voltage and sensation of frequency measurement unit and the function of frequency, and controls described capacitor switch according to described mode voltage.
9. as each described control gear in the claim 1 to 8, further comprise the on/off switch that is used for to described coil winding power supply.
10. control gear as claimed in claim 9, wherein, the described on/off switch of the preferential disconnection of described control unit changes the unit to control described electric capacity.
11. control gear as claimed in claim 10, wherein, described control unit is connected described on/off switch after the described electric capacity of control changes the unit.
12. control gear as claimed in claim 9, wherein, when the described voltage that senses was higher than overload voltage, described control unit came interruption of power supply by disconnecting described on/off switch.
13. control gear as claimed in claim 12, wherein, described control unit also disconnects described capacitor switch in addition.
14. a control gear that is used for linear compressor comprises:
Be laminated to the coil winding on the described linear compressor;
First capacitor of connecting with described coil winding;
Electric capacity changes the unit, and it forms the parallel-connection structure of described first capacitor;
The voltage sensing unit, it is used for described first capacitor of sensing and described electric capacity and changes at least one both end voltage of unit; And
Control unit, it is used for causing that according to load the output power of described linear compressor changes thus by change the total capacitance of described control gear according to the mode of being controlled described electric capacity change unit by the voltage of described voltage sensing unit institute sensing.
15. control gear as claimed in claim 14, wherein, described control unit is controlled described electric capacity change unit by the voltage of institute's sensing is made comparisons with predetermined reference potential, if the voltage of institute's sensing is lower than described reference potential, then increase described total capacitance, if the voltage of institute's sensing is equal to or higher than described reference potential, then reduce described total capacitance.
16. a control gear that is used for linear compressor comprises:
Be laminated to the coil winding on the described linear compressor;
First capacitor of connecting with described coil winding;
Electric capacity changes the unit, and it forms the parallel-connection structure of described first capacitor;
Voltage and sensation of frequency measurement unit, it is used for the voltage and the frequency of the electric power that sensing applies; And
Control unit, it is used for causing that by the total capacitance that changes described control gear the output power of described linear compressor changes, the total capacitance that changes described control gear is by being used to come computation schema voltage from the voltage of the electric power that applies of described voltage and sensation of frequency measurement unit and the function of frequency, and controls according to described mode voltage that mode that described electric capacity changes the unit realizes.
17. control gear as claimed in claim 16 wherein, calculates described mode voltage by following formula:
Vm=Vi+ (Fi-b) * a, a and b are constant in the formula.
18. as claim 16 or 17 described control gear, wherein, described control unit is controlled described electric capacity by described mode voltage and predetermined reference value are made comparisons and is changed the unit, if described mode voltage is less than described reference value, then increase described total capacitance, if described mode voltage is equal to or greater than described reference value, then reduce described total capacitance.
19. a control gear that is used for linear compressor comprises:
Be laminated to the coil winding on the described linear compressor;
With described coil winding series capacitors;
Constant electric power supply unit, its be used to receive external power, with described external power convert to specific size constant electric power, and described constant electric power is applied to described coil winding; And
Control unit, it is used for providing the constant electric power of described specific size to come to cause that according to load the output power of linear compressor changes by controlling described constant electric power supply unit to described coil winding.
20. control gear as claimed in claim 19, wherein, described constant electric power supply unit produces described constant electric power by the mode that the voltage of described external power and in the frequency at least one is converted to described specific size.
21. control gear as claimed in claim 20, wherein, the frequency of okperation of described coil winding and capacitor equates with the free frequency of described linear compressor under the maximum output situation.
22. as each described control gear in the claim 19 to 21, wherein, described coil winding is connected with a plurality of winding joints, described control gear further comprises branch apparatus, described branch apparatus optionally is connected to described a plurality of winding joint by described control unit control and according to desired output power, is used for applying described constant electric power to whole described coil winding or the described coil winding of part.
CN2007800041086A 2006-02-02 2007-01-16 Control apparatus for linear compressor Expired - Fee Related CN101400893B (en)

Applications Claiming Priority (13)

Application Number Priority Date Filing Date Title
KR10-2006-0010266 2006-02-02
KR1020060010264A KR100756719B1 (en) 2006-02-02 2006-02-02 Control apparatus for linear compressor
KR1020060010269 2006-02-02
KR1020060010266 2006-02-02
KR1020060010264 2006-02-02
KR1020060010269A KR100756720B1 (en) 2006-02-02 2006-02-02 Control apparatus for linear compressor
KR1020060010266A KR100783218B1 (en) 2006-02-02 2006-02-02 Control apparatus for linear compressor
KR10-2006-0010264 2006-02-02
KR10-2006-0010269 2006-02-02
KR1020060010267 2006-02-02
KR1020060010267A KR100756721B1 (en) 2006-02-02 2006-02-02 Controlling apparatus for linear compressor
KR10-2006-0010267 2006-02-02
PCT/KR2007/000272 WO2007089083A2 (en) 2006-02-02 2007-01-16 Control apparatus for linear compressor

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CN101932836B (en) * 2008-01-08 2015-06-03 Lg电子株式会社 Apparatus and method for controlling operation of compressor
KR101466402B1 (en) * 2008-02-20 2014-12-11 엘지전자 주식회사 Linear Compressor

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JPH07298579A (en) * 1994-04-20 1995-11-10 Matsushita Refrig Co Ltd Single-phase induction motor for refrigerator compressor
JP3132992B2 (en) * 1995-10-31 2001-02-05 三菱電機株式会社 Rotor assembly equipment
JPH10134953A (en) 1996-10-28 1998-05-22 Sharp Corp High frequency thawing device
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MY125213A (en) * 1999-11-12 2006-07-31 Lg Electronics Inc "device and method for controlling supply of current and static capacitance to compressor"
KR100396774B1 (en) * 2001-03-26 2003-09-03 엘지전자 주식회사 Driving comtrol apparatus for reciprocating compressor
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KR20050050972A (en) * 2003-11-26 2005-06-01 엘지전자 주식회사 Driving circuit of reciprocating compressor
KR100595550B1 (en) * 2004-02-20 2006-07-03 엘지전자 주식회사 Compressor driving apparatus of refrigerator with reciprocating compressor

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