WO2007098987A1 - Linear compressor with a gas spring - Google Patents
Linear compressor with a gas spring Download PDFInfo
- Publication number
- WO2007098987A1 WO2007098987A1 PCT/EP2007/050455 EP2007050455W WO2007098987A1 WO 2007098987 A1 WO2007098987 A1 WO 2007098987A1 EP 2007050455 W EP2007050455 W EP 2007050455W WO 2007098987 A1 WO2007098987 A1 WO 2007098987A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- compressor
- compressor piston
- movement
- reciprocating
- Prior art date
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
Definitions
- the invention relates to a refrigeration device, in particular a refrigerator and / or freezer or an air conditioner, comprising a refrigerator and a linear compressor, the linear compressor having a piston housing and a compressor piston reciprocating along an axis and an intermediate storage means for the kinetic energy of the back and her movable compressor piston, a linear compressor for a refrigeration device and a method for compressing a gas and a method for cooling goods.
- the compressor piston reciprocating along an axis between first and second reverse points must be supported in a direction transverse to the axis.
- the kinetic energy of the reciprocating compressor piston at the reversal points i. at the points at which reverses the direction of movement of the compressor piston, are temporarily stored in order to allow the least loss possible reversal of the direction of movement of the compressor piston.
- spring arrangements known in which diaphragm springs are supported by one or more coil springs or coil spring assemblies.
- spring arrangements are constructed comparatively complicated and thus expensive to manufacture and assembly. If the spring force of the springs decreases over time, or if the spring forces of the individual springs are unbalanced, friction can arise between the compressor piston and the piston housing, which degrades the efficiency of the linear compressor or the refrigerating machine and leads to more energy consumption.
- the refrigerator according to the invention in particular a refrigerator and / or freezer or air conditioning, preferably an air conditioning system for motor vehicles, comprising a refrigerator and a linear compressor, the linear compressor having a piston housing and a piston reciprocable therein along an axis and a buffer storage means for the kinetic energy of the reciprocating compressor piston, wherein the kinetic energy of the compressor piston with the temporary storage means during the reciprocating motion is temporarily stored by compression of a gaseous fluid.
- a second fluid in particular a refrigerant, is compressed in order to be able to produce cold with a downstream evaporation stage.
- the second fluid is compressed by movement of the compressor piston in the piston housing.
- the second fluid may also be the gaseous fluid used for caching.
- the movement of the compressor piston takes place essentially along an axis.
- the compressor piston oscillates between two reversal points, where it briefly comes to rest to change its direction of movement. At the reversal points, a forward movement is transformed into a movement.
- the kinetic energy lying in the movement of the compressor piston is temporarily stored in the form of potential energy.
- a total energy in the movement of the compressor piston which is composed of the kinetic energy of the compressor piston and the potential energy stored in the latching means, remains substantially constant.
- the intermediate storage means in particular, the kinetic energy of the compressor piston is received shortly before a reversal point and, after reversal of the direction of movement, substantially completely discharged again to the compressor piston.
- the goal is pursued to convert the mechanical energy applied by a drive almost completely in work on the fluid to be compressed; In particular, the drive should not take over a braking function for the compressor piston.
- the gas to be compressed is located, in particular, in a closed volume, on which a piston acts in a reducing manner.
- the pressure in the fluid increases.
- a pressure is achieved which is greater, preferably greater by 1 bar to 10 bar, particularly preferably by 2 bar to 7 bar, than a pressure which can be generated on a pressure side of the linear compressor.
- an uncontrolled striking of the compressor piston can be avoided at a stop or on a valve plate of the linear compressor, whereby wear is reduced and energy for the operation of the refrigerator is saved.
- the temporary storage means may be formed by a guest compression spring.
- the intermediate storage means preferably absorbs at least 90%, in particular at least 95%, preferably at least 99%, of the kinetic energy which lies in the movement of the compressor piston before a reversal point. Subsequently, the intermediate storage means at least 88%, in particular at least 97% of this energy back to the compressor piston, whereby the slowed down from the forward movement and come to rest at the reversal compressor piston is accelerated again during its movement.
- the gaseous fluid may be identical to or different from a second fluid compressed by the linear compressor.
- the gaseous fluid may be, for example, a refrigerant compressed by the linear compressor.
- any gas can be used in the caching.
- air could be used in a pneumatic spring.
- the means comprises a compression chamber formed by the piston housing and the compressor piston, in particular in the case of and / or closable by the reciprocating movement of the compressor piston.
- the compression chamber can be closed by the compressor piston itself, but it can also be closed by means of valves.
- the compression chamber can be formed by a dead space in the piston housing.
- the dead space is through walls of the compressor housing and a head side of the compressor piston.
- no valves are required to cause interim compression of the gaseous fluid in the dead space because the compressor piston compresses the gaseous fluid in the dead space.
- the compression chamber has valves which are actuated, ie opened or closed, in the correct phase during the reciprocating movement of the compressor piston.
- the means comprises a valve which closes before the direction of movement of the compressor piston reverses and re-opens after the direction of movement of the compressor piston has reversed.
- the valve opens and closes at least once per cycle.
- the valve closes during a forward movement and opens during a movement immediately following the forward movement.
- the valve closes during a forward movement within a distance of 50% of the reciprocating piston stroke before a reversal point of the compressor piston, in particular within a distance of 20% of the piston stroke before a reversal point of the compressor piston, in particular within 10% of Piston strokes before the reversal point of the compressor piston.
- the compressor piston is decelerated until it stops at a turning point.
- the valve opens during a movement within a distance of 50% of the reciprocating piston stroke to a reversal point of the compressor piston, in particular within a distance of 20% of the piston stroke to a reversal point of the compressor piston, in particular within 10% of the piston stroke after the reversal point of the compressor piston.
- the compressor piston is accelerated back to its original speed, wherein the buffering means emits the energy stored in it back to the compressor piston.
- the compressor piston is guided in the piston housing by means of a housing wall having openings and a gaseous fluid flowing through the openings, in particular a coolant.
- a gaseous fluid flowing through the openings in particular a coolant.
- Such guides can work oil-free. With the help of this guide, the compressor piston in the radial direction, ie in a direction transverse to the axis, stored. Due to the fluid flowing through the openings, a gas cushion is generated in front of the housing wall, through which the compressor piston is mounted without contact in the piston housing.
- a buffering means is provided at both reversal points of the compressor piston, wherein advantageously the kinetic energy of the compressor piston with the buffering means during the reciprocating motion can be temporarily stored by compressing a gaseous fluid.
- the kinetic energy is stored at the one reversal point by compression of the gaseous fluid, while at the other reversal point, the kinetic energy by means of a spring or a spring assembly, in particular by means of a metallic spring or a metallic spring package, is cached.
- the intermediate storage means may also comprise an elastic element, in particular a spring, preferably a diaphragm spring or a diaphragm spring packet, of composite material.
- a composite is a construction material consisting of two or more different materials, e.g. Fibers, plastic, metal, ceramics. In this case, at least one component, for example fibers, are incorporated into the basic structure, a so-called matrix.
- CFRP Carbon fiber reinforced plastics
- GRP glass fiber reinforced plastics
- TiGr composite i. a compound of titanium, graphite and epoxy resin, as well as certain polyaramides, especially Polyphenylenterephthalami- de (known under the brand name Kevlar), and others are used.
- the kinetic energy of the compressor piston for the reversal of the direction of motion can be reliably stored, so that a reliable and energy-saving operation of the refrigeration device is possible.
- the linear compressor according to the invention is particularly suitable and intended for the refrigeration device according to the invention and has a piston housing and a piston reciprocating along an axis thereof and a buffer storage means for the Kinetic energy of the reciprocating compressor piston, wherein the kinetic energy of the compressor piston with the latching means during the reciprocating motion is temporarily stored by compressing a gaseous fluid.
- the means may comprise a compression chamber, in particular a dead space, formed by the piston housing and a head surface of the compressor piston, in particular closable by the reciprocating movement.
- the means preferably has a valve which closes before the direction of movement of the compressor piston reverses and reopens after the direction of movement of the compressor piston has reversed.
- the valve may during a forward movement within a distance of 50% of the reciprocating piston stroke before a reversal point of the compressor piston, in particular within a distance of 20% of the piston stroke before a reversal point of the compressor piston, in particular within 10% of the piston stroke before the reversal point of the compressor piston, close.
- the valve may return to a point of reversal of the compressor piston, in particular within a distance of 20% of the piston stroke after a point of reversal of the compressor piston, in particular within 10% of the piston stroke after the piston stroke Reversal point of the compressor piston, open.
- a head side of the compressor piston by a distance of at least 5%, in particular by at least 10%, preferably by at least
- the compressor piston can be guided in the piston housing by means of a housing wall having openings and a gaseous fluid flowing through the openings, in particular a coolant.
- the linear compressor has, in particular at two reversal points of the compressor piston on a temporary storage means.
- the inventive method for compressing a gas by means of a refrigerator comprising a linear compressor, wherein the linear compressor comprises a piston housing and a piston reciprocating therein along an axis, provides that a predominant part of the kinetic energy of the reciprocating compressor piston, in particular more than 90%, preferably more than 95%, in particular preferably substantially complete, is temporarily stored by means of a gas cushion in order to bring about a reversal of the direction of movement of the reciprocating compressor piston.
- a gaseous fluid is compressed by the movement of the compressor piston, whereby the compressor piston is decelerated and comes to a standstill. Subsequently, the energy stored in the compression is reused to move the compressor piston in the opposite direction, i. in preparation to accelerate to the amount of original velocity so that the energy stored in the form of potential energy is converted back to kinetic energy.
- the reversal of the direction of travel can be accomplished essentially without the aid of the drive, i. drive-free.
- the gas cushion may be generated by compressing the gaseous fluid.
- the gaseous fluid is in particular a refrigerant for a refrigeration device.
- the gas cushion may also be formed by compressing another gas, in particular air.
- the gas cushion is advantageously formed by a compressed with the compressor piston itself gaseous fluid.
- the gas cushion is formed by enclosing an inner space by the piston housing and the compressor piston and closing it just before the direction of movement of the compressor piston reverses. After reversing the direction of movement, the interior is opened again. The opening and closing of this interior takes place in the correct phase with the reciprocating movement of the compressor piston.
- the gas cushion can also be produced with a separate gas spring.
- the interior can be closed by the compressor piston itself when the interior is designed as a dead space, and the compressor piston compresses the trapped gaseous fluid as it moves into the interior.
- the compressor piston compresses the trapped gaseous fluid as it moves into the interior.
- the interior is closed within a period of one quarter of the period length of the reciprocating motion, in particular of one-eighth of the period length of the reciprocating motion, before the time of reversing the direction of movement.
- a deceleration of the compressor piston is effected in this period.
- the interior is opened within a period of one quarter of the period length of the reciprocating motion, in particular of one-eighth of the period length of the reciprocating movement, after the time of reversing the direction of movement.
- the compressor piston is accelerated back to its original speed, which it had just before closing the interior.
- the inventive method for cooling goods uses the refrigeration device according to the invention and / or the linear compressor according to the invention. By such use, a particularly reliable, energy-saving and fast cooling of goods is possible. Further advantageous details or specific embodiments will be explained in more detail with reference to the following drawing, which is not intended to limit the present invention, but merely by way of example.
- Fig. 1 is a sectional view of a linear compressor according to the invention
- Fig. 2 is a sectional view of a refrigerator according to the invention.
- Fig. 3 is a sectional view of another linear compressor according to the invention.
- FIG. 1 shows a sectional view of a linear compressor 1 according to the invention with a piston housing 2, in which a compressor piston 4 moves back and forth along an axis 3 between a first reversal point 8 of the compressor piston 4 and a second reversal point 9 of the compressor piston 4.
- the kinetic energy of the compressor piston 4 is temporarily stored by means of an intermediate storage means 6 in order to bring about a low-energy reversal of the direction of movement of the compressor piston 4.
- the linear compressor 1 has a suction connection 14 with a first valve 10 and a pressure connection 15 with a second valve 11. With the aid of the linear compressor 1, a gaseous fluid 5 is compressed.
- the pressure provided at the pressure port 15 is about 8 to 9 bar
- the pressure in the compression chamber 7 is slightly higher in compression for the intermediate storage and is about 10 bar.
- the first valve 10 and the second valve 1 1 by means of a valve plate 16 in the correct phase with respect to the reciprocating motion of the compressor piston 4 driven that a gas compression pad 12 is formed in an interior 13 in front of the compressor piston 4, in which the gaseous Fluid 5 is compressed.
- the compressor piston 4 is braked in its movement, wherein its kinetic energy is substantially completely converted into the potential energy inherent in the gas compression pad 12.
- the compressor piston 4 is mounted with the aid of openings 22 having a housing wall 23 by a portion of the fluid 5 flows through the openings 22 and thus forms a gas pressure bearing, which leads the compressor piston 4 without contact in front of the housing wall 23.
- the fluid 5 required here is continuously conveyed by means of a feed 17. provided and forms between the compressor piston 4 and the housing wall 23, a gas bearing pad 18.
- the compressor piston 4 is driven by means of a drive 25 via a piston rod 19.
- the trained as a sleeve housing wall 23 is sealed by means of an earring 21.
- a spring 26 which is carbon fiber reinforced and thus lateral, ie in a direction transverse to the axis 3 directed, forces of the piston rod 19 can accommodate.
- the compressor piston 4 moves between the reversal points 8 and 9 with a piston stroke H.
- the compressor piston 4 is braked over a distance S by closing the valves 10, 1 1 and formation of the gas compression pad 12 and then accelerated again after reversing the direction of movement.
- the housing wall 23 forms together with the compressor piston 4 a compression chamber 7 when the valves 10, 1 1 are closed, in which the gaseous fluid 5 can be compressed.
- Fig. 2 shows a sectional view of the refrigerator 20 according to the invention with the linear compressor 1 and a refrigerator 27, in which goods 24, in particular food, can be cooled quickly, reliably and energy-saving.
- FIG. 3 shows a further embodiment of the linear compressor 1 according to the invention in a sectional view, wherein the interior 13 is designed as a dead space 28. Whenever the compressor piston enters this dead space 28, the gaseous fluid 7 is compressed to form a gas cushion 12. The compressor piston 4 closes the dead space 28 itself.
- the advantage here is that a striking of the compressor piston 4 to the valve plate 16 is also impossible if the valves 10, 1 1 temporarily not close properly because the dead space 28 requires no more in-phase closing valves.
- the valves 10, 1 1 can be used alone to release the suction port 14 and the pressure port 15 at a thermodynamically favorable time or close.
- the invention relates to a refrigeration device 20, in particular a refrigerator and / or freezer or an air conditioning system, comprising a cooling space 27 and a linear compressor 1, wherein the linear compressor 1, a piston housing 2 and a therein along an axis 3 out and movable compressor piston 4 and a kinetic energy latching means 6 of the reciprocating compressor piston 4, wherein the kinetic energy of the compressor piston 4 is temporarily stored with the latching means 6 during the reciprocating motion by compression of a gaseous fluid; a linear compressor with such a temporary storage means 6, and a method for compressing a gaseous fluid 5 by means of this refrigerating appliance 20 and a method for cooling goods.
- the invention is characterized in that with the aid of gas compression, a simple and efficient intermediate storage of the kinetic energy of the moving parts in the linear compressor 1 is made possible, which enables reliable and energy-saving operation during compression or cooling.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/223,999 US20100154441A1 (en) | 2006-02-28 | 2007-01-17 | Linear Compressor With a Gas Spring |
EP07703952A EP1991779A1 (en) | 2006-02-28 | 2007-01-17 | Linear compressor with a gas spring |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006009273.2 | 2006-02-28 | ||
DE102006009273A DE102006009273A1 (en) | 2006-02-28 | 2006-02-28 | Refrigeration device especially a cooling- and/or refrigeration cabinet, has kinetic energy of compressor piston stored with intermediate storage medium during intermittent oscillating movement by compression of gaseous fluid |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007098987A1 true WO2007098987A1 (en) | 2007-09-07 |
Family
ID=37888256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/050455 WO2007098987A1 (en) | 2006-02-28 | 2007-01-17 | Linear compressor with a gas spring |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100154441A1 (en) |
EP (1) | EP1991779A1 (en) |
CN (1) | CN101395372A (en) |
DE (1) | DE102006009273A1 (en) |
RU (1) | RU2008136547A (en) |
WO (1) | WO2007098987A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009046649A1 (en) * | 2009-11-12 | 2011-05-19 | Robert Bosch Gmbh | Air conditioning compressor for a vehicle, vehicle |
CN102926968A (en) * | 2011-08-10 | 2013-02-13 | 中国科学院理化技术研究所 | Unilateral spring linear compressor |
BR102014007557A2 (en) * | 2014-03-28 | 2016-04-12 | Fmc Technologies Do Brasil Ltda | spring return hydraulic actuator |
US10352313B2 (en) * | 2014-06-24 | 2019-07-16 | Lg Electronics Inc. | Linear compressor |
KR102201629B1 (en) * | 2014-06-26 | 2021-01-12 | 엘지전자 주식회사 | A linear compressor and a refrigerator including the same |
KR20190031827A (en) | 2017-09-18 | 2019-03-27 | 엘지전자 주식회사 | Linear compressor |
KR20190031828A (en) | 2017-09-18 | 2019-03-27 | 엘지전자 주식회사 | Linear compressor |
KR20190038087A (en) | 2017-09-29 | 2019-04-08 | 엘지전자 주식회사 | Linear compressor |
CN110094320A (en) * | 2019-05-08 | 2019-08-06 | 北京理工大学 | A kind of two-cylinder type linear compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4353220A (en) * | 1980-06-17 | 1982-10-12 | Mechanical Technology Incorporated | Resonant piston compressor having improved stroke control for load-following electric heat pumps and the like |
JPS59221401A (en) * | 1983-06-01 | 1984-12-13 | Hitachi Ltd | Gas spring controller of free piston engine |
US4721440A (en) * | 1987-02-13 | 1988-01-26 | Mechanical Technology Incorporated | Linear gas compressor |
EP0277382A1 (en) * | 1986-12-24 | 1988-08-10 | Whirlpool International B.V. | Motor-compressor unit |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3937600A (en) * | 1974-05-08 | 1976-02-10 | Mechanical Technology Incorporated | Controlled stroke electrodynamic linear compressor |
US4873913A (en) * | 1986-09-12 | 1989-10-17 | Helix Technology Corporation | Dry roughing pump having a gas film bearing |
NZ500681A (en) * | 1999-10-21 | 2002-06-28 | Fisher & Paykel Appliances Ltd | A linear compressor with gas bearing passages between cylinder and cylinder lining |
CN1284929C (en) * | 1999-12-21 | 2006-11-15 | Lg电子株式会社 | Piston supporting structure for linear compressor |
US6491506B1 (en) * | 2000-05-29 | 2002-12-10 | Lg Electronics Inc. | Linear compressor |
DE10230693A1 (en) * | 2002-07-06 | 2004-01-22 | BSH Bosch und Siemens Hausgeräte GmbH | Refrigerator or freezer |
KR100529933B1 (en) * | 2004-01-06 | 2005-11-22 | 엘지전자 주식회사 | Linear compressor |
-
2006
- 2006-02-28 DE DE102006009273A patent/DE102006009273A1/en not_active Ceased
-
2007
- 2007-01-17 WO PCT/EP2007/050455 patent/WO2007098987A1/en active Application Filing
- 2007-01-17 RU RU2008136547/06A patent/RU2008136547A/en unknown
- 2007-01-17 CN CNA2007800070318A patent/CN101395372A/en active Pending
- 2007-01-17 US US12/223,999 patent/US20100154441A1/en not_active Abandoned
- 2007-01-17 EP EP07703952A patent/EP1991779A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4353220A (en) * | 1980-06-17 | 1982-10-12 | Mechanical Technology Incorporated | Resonant piston compressor having improved stroke control for load-following electric heat pumps and the like |
JPS59221401A (en) * | 1983-06-01 | 1984-12-13 | Hitachi Ltd | Gas spring controller of free piston engine |
EP0277382A1 (en) * | 1986-12-24 | 1988-08-10 | Whirlpool International B.V. | Motor-compressor unit |
US4721440A (en) * | 1987-02-13 | 1988-01-26 | Mechanical Technology Incorporated | Linear gas compressor |
Also Published As
Publication number | Publication date |
---|---|
CN101395372A (en) | 2009-03-25 |
DE102006009273A1 (en) | 2007-08-30 |
US20100154441A1 (en) | 2010-06-24 |
RU2008136547A (en) | 2010-04-10 |
EP1991779A1 (en) | 2008-11-19 |
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