US20050129540A1 - Constructive arrangement for a resonant compressor - Google Patents
Constructive arrangement for a resonant compressor Download PDFInfo
- Publication number
- US20050129540A1 US20050129540A1 US10/504,923 US50492305A US2005129540A1 US 20050129540 A1 US20050129540 A1 US 20050129540A1 US 50492305 A US50492305 A US 50492305A US 2005129540 A1 US2005129540 A1 US 2005129540A1
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- United States
- Prior art keywords
- piston
- arrangement according
- magnetic
- cylinder
- shell
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Classifications
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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
- 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
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
Definitions
- the present invention refers, generally, to a constructive arrangement for a resonant compressor of the type driven by a linear motor, to be applied to refrigeration systems and presenting a piston reciprocating inside a cylinder.
- the gas suction and gas compression operations are performed by the reciprocating axial movements of each piston inside a cylinder, which is closed by a cylinder head and mounted within a hermetic shell, in the cylinder head being positioned the suction and discharge valves that control the admission and discharge of the gas in relation to the cylinder.
- the piston is driven by an actuating means that supports magnetic components operatively associated with a linear motor affixed to the shell of the compressor.
- each piston-actuating means assembly is connected to a resonant spring affixed to the hermetic shell of the compressor, in order to operate as a guide for the axial displacement of the piston and make the whole assembly to act resonantly in a predetermined frequency, allowing the linear motor to be adequately dimensioned to continuously supply energy to the compressor upon operation.
- the linear motor is mounted around the cylinder and the piston and comprises a stack of internal laminations with a coil inserted therein, and a stack of external laminations, the magnetic actuator being linearly displaced through the space formed by these two stacks of laminations.
- the magnetic flow generated by the passage of an alternating current through the coil travels through the structure of the linear motor, supplying the necessary power for the axial displacement of the magnet, which is rigidly connected to the linear motor.
- part of the magnetic flow generated by the coil also travels through other components of the linear compressor, such as the piston and the cylinder, which are both generally made of cast iron, closing a magnetic circuit with the shell of the compressor.
- This magnetic circuit causes the generation of Foucault currents in these components, generating electric losses in the compressor.
- a further object is to provide an arrangement such as mentioned above, which minimizes the presence of Foucault currents, without increasing the cost of the compressor and making impractical its manufacture.
- a resonant compressor comprising a shell, within which are mounted: a non-resonant assembly formed by a motor and a cylinder, said motor having a coil generating a magnetic flow that travels through the shell; a resonant assembly formed by a piston reciprocating inside the cylinder, and by an actuating means operatively coupling the piston to the motor, said arrangement comprising a magnetic insulating means, which is affixed to one of the parts defined by the shell, the resonant assembly, and the non-resonant assembly, and which is arranged to interrupt the magnetic flow path between the shell and at least one of the parts defined by the piston and by the cylinder in a direction substantially parallel to the displacement direction of the piston.
- FIG. 1 is a schematic longitudinal diametrical sectional view of a hermetic compressor of the type driven by a linear motor constructed according to the prior art
- FIG. 2 is a schematic partial longitudinal diametrical sectional view of the hermetic compressor illustrated in FIG. 1 , presenting some magnetic flow lines traveling through the shell of the compressor and part of the components thereof, such as the piston and the cylinder; and
- FIG. 3 is a schematic view, such as that of FIG. 2 , presenting some magnetic flow lines traveling through the shell and through part of the components of the compressor, according to the arrangement of the present invention.
- the present invention will be described in relation to a reciprocating compressor driven by a linear motor of the type utilized in refrigeration systems and comprising a hermetic shell 1 , within which is mounted a motor-compressor assembly including a non-resonant assembly affixed to the inside of said shell 1 and formed by a linear motor and a cylinder 2 , and a resonant assembly formed by a piston 10 reciprocating inside the cylinder 2 and by an actuating means 3 external to the cylinder 2 and which carries a magnet 4 to be axially impelled upon energization of the linear motor, said actuating means 3 operatively coupling the piston 10 to the linear motor.
- the linear motor is mounted around the cylinder 2 and the piston 10 and comprises a stack of internal laminations 5 with a coil 6 inserted therein, and a stack of external laminations 7 .
- the energization of the coil 6 by the alternating current passing therethrough generates a magnetic flow that travels through the structure of the motor, allowing the movement of both the magnet 4 and the piston 10 .
- the magnetic flow generated by the coil 6 travels through the structure of the linear motor, as well as through the shell 1 and other components of the compressor, closing circuits of magnetic flow lines which allow Foucault currents to be generated in these components, generating electric losses to the compressor.
- the piston 10 and the cylinder 2 are manufactured in a magnetic material, for example cast iron.
- the compressor also includes spring means 8 , for example in the form of helical springs, mounted under constant compression to the resonant assembly and to the non-resonant assembly and which are resiliently and axially deformable in the displacement direction of the piston 10 .
- spring means 8 for example in the form of helical springs, mounted under constant compression to the resonant assembly and to the non-resonant assembly and which are resiliently and axially deformable in the displacement direction of the piston 10 .
- the cylinder 2 has an end closed by a valve plate 20 provided with a suction valve and a discharge valve, which are not illustrated, allowing the selective fluid communication between a compression chamber 9 that is defined between a top portion 11 of the piston 10 and the valve plate 20 , and respective internal portions of a cylinder head 30 that are respectively maintained in fluid communication with the low and high pressure sides of the refrigeration system to which the compressor is coupled.
- the valve plate 20 is generally made of a ferrous material, such as cast or sintered iron
- the cylinder head 30 is generally made of a non-magnetic material, such as aluminum, forming a barrier to the path of the magnetic flow lines through said component.
- the present invention provides a constructive arrangement for the resonant compressor of the type described above and comprising a magnetic insulating means, which is affixed to one of the parts defined by the shell 1 , by the resonant assembly, and by the non-resonant assembly, and which is arranged to interrupt the magnetic flow path between the shell 1 and at least one of the parts defined by the piston 10 and by the cylinder 2 , in a direction substantially parallel to the displacement direction of the piston 10 .
- the invention also comprises other constructive options, such as that in which the magnetic insulating means interrupts the magnetic flow path between the non-resonant assembly and at least one of said parts defined by the piston 10 and the cylinder 2 , for example, particularly interrupting the magnetic flow path between the spring means 8 disposed between the non-resonant assembly and the actuating means 3 and the latter, and more particularly between said non-resonant assembly and at least the piston 10 .
- the present solution also foresees a constructive option, in which a magnetic insulating means is disposed to interrupt the magnetic flow between the actuating means 3 and at least said piston 10 . Since the Foucault currents generate more losses when the magnetic flow lines are crossing bodies of higher mass, the present invention, when applied between the actuating means 3 and the piston 10 and the cylinder 2 , provides a magnetic insulating means preferably between said actuating means and the piston 10 , as described hereafter, and it can additionally provide the magnetic insulating means between the actuating means 3 and the cylinder 2 .
- the magnetic insulating means is defined by at least part of the piston 10 , and it can also be defined by at least part of the cylinder 2 .
- the magnetic insulating means comprises, for example at least one element made of a non-magnetic material disposed between the piston 10 and the actuating means 3 , and each element in a non-magnetic material can be defined by a coupling portion 12 of the piston 10 connecting the actuating means 3 to the top portion 11 of the piston 10 .
- said top portion 11 is made of a magnetic material tribologically compatible with that of the cylinder 2 , such as cast iron.
- each element of a non-magnetic material is in the form of a pastille, not illustrated, defined adjacent to the actuating means 3 and attachable to a respective part defined by the piston 10 , and which can also be attached to the cylinder 2 .
- the coupling portion 12 defines the magnetic insulating means and is mounted to the piston 10 through a respective end mounted to the top portion 11 of the piston 10 , for example affixed to the inside of said top portion 11 when the latter is tubular.
- the coupling portion 12 is an insert made of a non-magnetic material, such as aluminum and, for example 10 mm thick, which is mounted to the inside of the top portion 11 of the piston 10 made of a material tribologically compatible with that of the cylinder 2 .
- the fixation between the coupling portion 12 and the top portion 11 of the piston 10 can be made by any one of the processes, such as interference, welding, and gluing.
- the interruption of the magnetic flow in the present invention can be achieved through a magnetic insulating means in the form of a lining provided in the part to which it is affixed.
Abstract
A constructive arrangement for a resonant compressor comprising a shell (1), within which are mounted: a non-resonant assembly formed by a motor and a cylinder (2), said motor having a coil (6) generating a magnetic flow that travels through the shell (1); a resonant assembly formed by a piston (10) reciprocating inside the cylinder (2) and by an actuating means (3) operatively coupling the piston (10) to the motor, said arrangement comprising a magnetic insulating means, which is affixed to one of the parts defined by the shell (1), by the resonant assembly, and by the non-resonant assembly, and which is arranged so as to interrupt the magnetic flow path between the shell (1) and at least one of the parts defined by the piston (10) and the cylinder (2) in a direction substantially parallel to the displacement direction of the piston (10).
Description
- The present invention refers, generally, to a constructive arrangement for a resonant compressor of the type driven by a linear motor, to be applied to refrigeration systems and presenting a piston reciprocating inside a cylinder.
- In a reciprocating compressor driven by a linear motor, the gas suction and gas compression operations are performed by the reciprocating axial movements of each piston inside a cylinder, which is closed by a cylinder head and mounted within a hermetic shell, in the cylinder head being positioned the suction and discharge valves that control the admission and discharge of the gas in relation to the cylinder. The piston is driven by an actuating means that supports magnetic components operatively associated with a linear motor affixed to the shell of the compressor. In some known constructions, each piston-actuating means assembly is connected to a resonant spring affixed to the hermetic shell of the compressor, in order to operate as a guide for the axial displacement of the piston and make the whole assembly to act resonantly in a predetermined frequency, allowing the linear motor to be adequately dimensioned to continuously supply energy to the compressor upon operation.
- In a known construction for a linear compressor, the linear motor is mounted around the cylinder and the piston and comprises a stack of internal laminations with a coil inserted therein, and a stack of external laminations, the magnetic actuator being linearly displaced through the space formed by these two stacks of laminations.
- The magnetic flow generated by the passage of an alternating current through the coil travels through the structure of the linear motor, supplying the necessary power for the axial displacement of the magnet, which is rigidly connected to the linear motor.
- However, part of the magnetic flow generated by the coil also travels through other components of the linear compressor, such as the piston and the cylinder, which are both generally made of cast iron, closing a magnetic circuit with the shell of the compressor. This magnetic circuit causes the generation of Foucault currents in these components, generating electric losses in the compressor.
- According to the known prior art, in order to avoid such losses, at least part of the components through which is established the Foucault current should be manufactured in non-magnetic materials, such as aluminum, in order to interrupt a significant amount of the peripheral flow that is generated. However, producing components with such materials, which are very expensive, sometimes makes economically impractical the manufacture of the compressor.
- Thus, it is an object of the present invention to provide a constructive arrangement for a resonant compressor, which without causing energetic losses during the movement of the piston, minimizes the presence of Foucault currents in a closed circuit with the components of the compressor.
- A further object is to provide an arrangement such as mentioned above, which minimizes the presence of Foucault currents, without increasing the cost of the compressor and making impractical its manufacture.
- These and other objects are attained through a constructive arrangement for a resonant compressor comprising a shell, within which are mounted: a non-resonant assembly formed by a motor and a cylinder, said motor having a coil generating a magnetic flow that travels through the shell; a resonant assembly formed by a piston reciprocating inside the cylinder, and by an actuating means operatively coupling the piston to the motor, said arrangement comprising a magnetic insulating means, which is affixed to one of the parts defined by the shell, the resonant assembly, and the non-resonant assembly, and which is arranged to interrupt the magnetic flow path between the shell and at least one of the parts defined by the piston and by the cylinder in a direction substantially parallel to the displacement direction of the piston.
- The invention will be described below, with reference to the enclosed drawings, in which:
-
FIG. 1 is a schematic longitudinal diametrical sectional view of a hermetic compressor of the type driven by a linear motor constructed according to the prior art; -
FIG. 2 is a schematic partial longitudinal diametrical sectional view of the hermetic compressor illustrated inFIG. 1 , presenting some magnetic flow lines traveling through the shell of the compressor and part of the components thereof, such as the piston and the cylinder; and -
FIG. 3 is a schematic view, such as that ofFIG. 2 , presenting some magnetic flow lines traveling through the shell and through part of the components of the compressor, according to the arrangement of the present invention. - The present invention will be described in relation to a reciprocating compressor driven by a linear motor of the type utilized in refrigeration systems and comprising a
hermetic shell 1, within which is mounted a motor-compressor assembly including a non-resonant assembly affixed to the inside of saidshell 1 and formed by a linear motor and acylinder 2, and a resonant assembly formed by apiston 10 reciprocating inside thecylinder 2 and by an actuating means 3 external to thecylinder 2 and which carries amagnet 4 to be axially impelled upon energization of the linear motor, said actuating means 3 operatively coupling thepiston 10 to the linear motor. - As illustrated in the enclosed drawings, the linear motor is mounted around the
cylinder 2 and thepiston 10 and comprises a stack ofinternal laminations 5 with acoil 6 inserted therein, and a stack ofexternal laminations 7. The energization of thecoil 6 by the alternating current passing therethrough generates a magnetic flow that travels through the structure of the motor, allowing the movement of both themagnet 4 and thepiston 10. - According to the illustration in
FIG. 2 , in the prior art construction, the magnetic flow generated by thecoil 6 travels through the structure of the linear motor, as well as through theshell 1 and other components of the compressor, closing circuits of magnetic flow lines which allow Foucault currents to be generated in these components, generating electric losses to the compressor. - In this construction, the
piston 10 and thecylinder 2 are manufactured in a magnetic material, for example cast iron. - In the illustrated construction, the compressor also includes spring means 8, for example in the form of helical springs, mounted under constant compression to the resonant assembly and to the non-resonant assembly and which are resiliently and axially deformable in the displacement direction of the
piston 10. - In the embodiment illustrated in
FIG. 1 , thecylinder 2 has an end closed by avalve plate 20 provided with a suction valve and a discharge valve, which are not illustrated, allowing the selective fluid communication between acompression chamber 9 that is defined between atop portion 11 of thepiston 10 and thevalve plate 20, and respective internal portions of acylinder head 30 that are respectively maintained in fluid communication with the low and high pressure sides of the refrigeration system to which the compressor is coupled. In this construction, thevalve plate 20 is generally made of a ferrous material, such as cast or sintered iron, and thecylinder head 30 is generally made of a non-magnetic material, such as aluminum, forming a barrier to the path of the magnetic flow lines through said component. - The present invention provides a constructive arrangement for the resonant compressor of the type described above and comprising a magnetic insulating means, which is affixed to one of the parts defined by the
shell 1, by the resonant assembly, and by the non-resonant assembly, and which is arranged to interrupt the magnetic flow path between theshell 1 and at least one of the parts defined by thepiston 10 and by thecylinder 2, in a direction substantially parallel to the displacement direction of thepiston 10. - Although only one specific construction for the present invention, to be described below, has been illustrated, it should be understood that the invention also comprises other constructive options, such as that in which the magnetic insulating means interrupts the magnetic flow path between the non-resonant assembly and at least one of said parts defined by the
piston 10 and thecylinder 2, for example, particularly interrupting the magnetic flow path between thespring means 8 disposed between the non-resonant assembly and the actuating means 3 and the latter, and more particularly between said non-resonant assembly and at least thepiston 10. - The present solution also foresees a constructive option, in which a magnetic insulating means is disposed to interrupt the magnetic flow between the actuating means 3 and at least said
piston 10. Since the Foucault currents generate more losses when the magnetic flow lines are crossing bodies of higher mass, the present invention, when applied between the actuating means 3 and thepiston 10 and thecylinder 2, provides a magnetic insulating means preferably between said actuating means and thepiston 10, as described hereafter, and it can additionally provide the magnetic insulating means between the actuating means 3 and thecylinder 2. - In this constructive option, the magnetic insulating means is defined by at least part of the
piston 10, and it can also be defined by at least part of thecylinder 2. - While the solution in which the
whole piston 10 is constructed in a magnetic insulating material interrupts the magnetic flow traversing these components of the compressor, such solution, besides being expensive is not the ideal one because thepiston 10 does not form an adequate tribologic pair with thecylinder 2. On the other hand, the construction of thecylinder 2 in a magnetic insulating material that is tribologically compatible with thepiston 10, not only makes the construction of the compressor impractical, as a function of the high cost thereof, but also results in an insatisfactory tribologic pair, which is not the more adequate one when cast iron is used. - In a constructive option of the present solution, the magnetic insulating means comprises, for example at least one element made of a non-magnetic material disposed between the
piston 10 and the actuating means 3, and each element in a non-magnetic material can be defined by acoupling portion 12 of thepiston 10 connecting the actuating means 3 to thetop portion 11 of thepiston 10. In this construction, saidtop portion 11 is made of a magnetic material tribologically compatible with that of thecylinder 2, such as cast iron. In a variation of said constructive option, in which, for example, thepiston 10 is massive, each element of a non-magnetic material is in the form of a pastille, not illustrated, defined adjacent to the actuating means 3 and attachable to a respective part defined by thepiston 10, and which can also be attached to thecylinder 2. - In another constructive option, the
coupling portion 12 defines the magnetic insulating means and is mounted to thepiston 10 through a respective end mounted to thetop portion 11 of thepiston 10, for example affixed to the inside of saidtop portion 11 when the latter is tubular. - In the illustrated construction, the
coupling portion 12 is an insert made of a non-magnetic material, such as aluminum and, for example 10 mm thick, which is mounted to the inside of thetop portion 11 of thepiston 10 made of a material tribologically compatible with that of thecylinder 2. The fixation between thecoupling portion 12 and thetop portion 11 of thepiston 10 can be made by any one of the processes, such as interference, welding, and gluing. - Although not illustrated, the interruption of the magnetic flow in the present invention can be achieved through a magnetic insulating means in the form of a lining provided in the part to which it is affixed.
Claims (15)
1. A constructive arrangement for a resonant compressor comprising a shell (1), within which are mounted: a non-resonant assembly formed by a motor and a cylinder (2), said motor having a coil (6) generating a magnetic flow which travels through the shell (1); a resonant assembly formed by a piston (10) reciprocating inside the cylinder (2) and by an actuating means (3) operatively coupling the piston (10) to the motor, characterized in that it comprises a magnetic insulating means, which is affixed to one of the parts defined by the shell (1), by the resonant assembly, and by the non-resonant assembly, and which is arranged to interrupt the magnetic flow path between the shell (1) and at least one of the parts defined by the piston (10) and by the cylinder (2) in a direction substantially parallel to the displacement direction of the piston (10).
2. The arrangement according to claim 1 , characterized in that the magnetic insulating means interrupts the magnetic flow path between the non-resonant assembly and at least one of said parts defined by the piston (10) and the cylinder (2).
3. The arrangement according to claim 2 , in which the resonant assembly carries at least one spring means (8) mounted to the actuating means (3) and to the non-resonant assembly and which is resiliently and axially deformable in the displacement direction of the piston (10), characterized in that the magnetic insulating means interrupts the magnetic flow path between said spring means (8) and at least one of said parts defined by the piston (10) and the cylinder (2).
4. The arrangement according to claim 2 , characterized in that the magnetic insulating means interrupts the magnetic flow path at least between the actuating means (3) and the piston (10).
5. The arrangement according to claim 4 , characterized in that the magnetic insulating means is defined by at least part of the piston (10).
6. The arrangement according to claim 5 , characterized in that the magnetic insulating means is defined by at least part of the cylinder (2).
7. The arrangement according to claim 4 , characterized in that the magnetic insulating means comprises at least one element made of a non-magnetic material disposed between the piston (10) and the actuating means (3).
8. The arrangement according to claim 7 , characterized in that each element in a non-magnetic material is defined by a coupling portion (12) of the piston (10) connecting the actuating means (3) to a top portion (11) of the piston (10).
9. The arrangement according to claim 4 , characterized in that each element in a non-magnetic material is a pastille (40) defined adjacent to the actuating means (3) and attachable to a respective part defined by the piston (10) and by the cylinder (2).
10. The arrangement according to claim 1 , characterized in that the magnetic insulating means is a lining provided in the part to which it is affixed.
11. The arrangement according to claim 5 , characterized in that the piston (10) is massive.
12. The arrangement according to claim 8 , characterized in that the coupling portion (12) has an end mounted to the inside of the top portion (11) of the piston (10).
13. The arrangement according to claim 12 , characterized in that the top portion (11) is tubular and the coupling portion (12) is an insert mounted to the inside of the top portion (11).
14. The arrangement according to claim 13 , characterized in that the insert is mounted to the top portion (11) by any one of the processes, such as interference, welding, or gluing.
15. The arrangement according to claim 7 , characterized in that the element in a non-magnetic material presents a thickness of at least about 10 mm.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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BRPI0201154-9 | 2002-03-13 | ||
BR0201154-9A BR0201154A (en) | 2002-03-13 | 2002-03-13 | Construction arrangement for resonant compressor |
PCT/BR2003/000034 WO2003076805A1 (en) | 2002-03-13 | 2003-03-11 | Constructive arrangement for a resonant compressor |
Publications (1)
Publication Number | Publication Date |
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US20050129540A1 true US20050129540A1 (en) | 2005-06-16 |
Family
ID=27792692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/504,923 Abandoned US20050129540A1 (en) | 2002-03-13 | 2003-03-11 | Constructive arrangement for a resonant compressor |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050129540A1 (en) |
EP (1) | EP1483504A1 (en) |
JP (1) | JP2005520089A (en) |
KR (1) | KR20040096653A (en) |
CN (1) | CN1643253A (en) |
AU (1) | AU2003212128A1 (en) |
BR (1) | BR0201154A (en) |
WO (1) | WO2003076805A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070132321A1 (en) * | 2005-11-30 | 2007-06-14 | Park Kyeong B | Linear compressor |
US20090252623A1 (en) * | 2008-04-02 | 2009-10-08 | Jong-Yoon Choi | Reciprocating motor and a reciprocating compressor having the same |
US9084845B2 (en) | 2011-11-02 | 2015-07-21 | Smith & Nephew Plc | Reduced pressure therapy apparatuses and methods of using same |
US9227000B2 (en) | 2006-09-28 | 2016-01-05 | Smith & Nephew, Inc. | Portable wound therapy system |
US9427505B2 (en) | 2012-05-15 | 2016-08-30 | Smith & Nephew Plc | Negative pressure wound therapy apparatus |
US9446178B2 (en) | 2003-10-28 | 2016-09-20 | Smith & Nephew Plc | Wound cleansing apparatus in-situ |
US9844473B2 (en) | 2002-10-28 | 2017-12-19 | Smith & Nephew Plc | Apparatus for aspirating, irrigating and cleansing wounds |
US9901664B2 (en) | 2012-03-20 | 2018-02-27 | Smith & Nephew Plc | Controlling operation of a reduced pressure therapy system based on dynamic duty cycle threshold determination |
US9956121B2 (en) | 2007-11-21 | 2018-05-01 | Smith & Nephew Plc | Wound dressing |
US10307517B2 (en) | 2010-09-20 | 2019-06-04 | Smith & Nephew Plc | Systems and methods for controlling operation of a reduced pressure therapy system |
EP3414828A4 (en) * | 2016-02-11 | 2019-10-16 | Carleton Life Support Systems Inc. | Symmetric floating coil compressor |
US10682446B2 (en) | 2014-12-22 | 2020-06-16 | Smith & Nephew Plc | Dressing status detection for negative pressure wound therapy |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100619731B1 (en) * | 2004-07-26 | 2006-09-08 | 엘지전자 주식회사 | Reciprocating motor and reciprocating compressor having the reciprocating motor |
CN101865111B (en) * | 2010-05-06 | 2011-10-19 | 大连理工大学 | Resonance compressor |
CN102005890B (en) * | 2010-10-18 | 2012-11-21 | 南京航空航天大学 | Resonance type electromagnetic actuator |
CN102777353A (en) * | 2012-08-15 | 2012-11-14 | 张华媛 | Linear compressor with damping structure |
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AU3235971A (en) * | 1970-09-01 | 1973-02-15 | Bison Anstalt | Improvements in oscillating electromagnetic compressors or vacuum pumps for gases or gas containing fluids |
DE69907801T2 (en) * | 1998-04-28 | 2004-03-11 | Matsushita Refrigeration Co., Higashiosaka | Linear motor and linear compressor |
JP2000297751A (en) * | 1999-04-15 | 2000-10-24 | Matsushita Refrig Co Ltd | Vibration type compressor |
-
2002
- 2002-03-13 BR BR0201154-9A patent/BR0201154A/en not_active IP Right Cessation
-
2003
- 2003-03-11 CN CNA038058596A patent/CN1643253A/en active Pending
- 2003-03-11 KR KR10-2004-7013776A patent/KR20040096653A/en not_active Application Discontinuation
- 2003-03-11 WO PCT/BR2003/000034 patent/WO2003076805A1/en not_active Application Discontinuation
- 2003-03-11 AU AU2003212128A patent/AU2003212128A1/en not_active Abandoned
- 2003-03-11 US US10/504,923 patent/US20050129540A1/en not_active Abandoned
- 2003-03-11 EP EP03707940A patent/EP1483504A1/en not_active Withdrawn
- 2003-03-11 JP JP2003574992A patent/JP2005520089A/en not_active Withdrawn
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US3461806A (en) * | 1965-03-12 | 1969-08-19 | Maurice Barthalon | Reciprocating electric motor |
US3991585A (en) * | 1974-04-29 | 1976-11-16 | U.S. Philips Corporation | Cold-gas refrigerator |
US6307287B1 (en) * | 1999-03-12 | 2001-10-23 | The Penn State Research Foundation | High-efficiency moving-magnet loudspeaker |
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
Publication number | Publication date |
---|---|
KR20040096653A (en) | 2004-11-16 |
WO2003076805A1 (en) | 2003-09-18 |
JP2005520089A (en) | 2005-07-07 |
EP1483504A1 (en) | 2004-12-08 |
BR0201154A (en) | 2003-12-02 |
CN1643253A (en) | 2005-07-20 |
AU2003212128A1 (en) | 2003-09-22 |
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