Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
  • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
  • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/0027—Pulsation and noise damping means
  • F04B39/0044—Pulsation and noise damping means with vibration damping supports
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/10—Adaptations or arrangements of distribution members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
  • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
  • F04B39/125—Cylinder heads
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/02—Permanent magnets [PM]
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/10—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
  • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
• • 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
  • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
  • H02K33/04—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation
  • H02K33/06—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation with polarised armatures
• • 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 relates a linear motor compressor, and more particularly, to a linear motor compressor including a permanent magnet in which magnetic poles with different magnetic polarities are arranged in a reciprocating direction of a piston, so that the output of power can be increased and a compact design thereof can also be made.
• FIG. 6 schematically shows a common configuration of a conventional linear motor compressor disclosed in the above documents.
• the conventional linear motor compressor 100 comprises a compressor 110 which includes a piston 102 reciprocating to compress a working fluid, a linear motor 120 which supplies electric power to reciprocate the piston 102, and a resonant spring 130 which supports the piston 102 such that the piston can reciprocate.
• the compressor 102 includes a cylinder 101, a piston 102 which is inserted into one side of the cylinder 101 to be able to reciprocate, and a cylinder head 104 which is fixed to the other side of the cylinder 101 to define a compression space CV between the inside of the cylinder 101 and the piston 102.
• the compressor 100 includes a suction valve 105 installed to the piston 102 to suck up a working fluid into a compression chamber when the piston 102 moves backward, and a discharge valve 104 installed to the cylinder head 103 to discharge the working fluid compressed in the compression chamber to the outside when the piston 102 moves forward.
• both of the discharge valve 104 and the suction valve 105 may be installed to the cylinder head 103.
• the linear motor 120 includes an inner cylindrical core 123 installed around the cylinder 101, an outer core 122 installed to be spaced apart by a predetermined gap 140 from an outer surface of the inner core 123, and a coil 121 wound inside the outer core 122. Further, the linear motor 120 includes a cylindrical permanent magnet 124 installed within the gap 140 and a permanent magnet support member 125 for connecting and fixing the permanent magnet 124 to the piston 102.
• the outer and inner cores 122 and 123 are formed by stacking a plurality of ferromagnetic plates, and a slot 122c is formed in an inner surface of the outer core 122 in a circumferential direction to form different magnetic poles 122a and 122b. Furthermore, as shown in Fig. 7 (a) and (b), the cylindrical permanent magnet 124 is composed of outer and inner portions 124a and 124b in a circumferential direction which have different magnetic poles.
• Fig. 8 illustrates an operating principle of the conventional linear motor compressor 100 when AC electric power is supplied thereto. IfAC power is supplied to the coil 121, the magnetic poles 122a and 122b on an inner circumference of an outer yoke 122 are alternately changed. That is, if an N pole is induced to one magnetic pole 122a, an S pole is induced to the other magnetic pole 122b. Thus, the magnetic poles 122a and 122b alternately exert attractive and repulsive forces to the permanent magnet 124 with an S pole formed on an outer circumference thereof, and thus, impart alternating thrust force to the permanent magnet. As shown in Fig.
• the thrust force is exerted to the permanent magnet in a left-arrow direction during a half cycle of the supplied AC electric power (in a region of Fig. 8 (a), (b) and (c)) and in a right-arrow direction during the other half cycle (in a region of Fig. 8 (c), (d) and (a)). Therefore, the piston 102 connected to the permanent magnet 124 reciprocates in the cylinder 101 at the same frequency as that of the supplied AC electric power. At this time, the thrust force exerted to the permanent magnet is proportional to the magnitude of the current flowing in the coil 121 and the magnetic flux density of the permanent magnet 124.
• the inner core should be used to form a magnetic path for the inner magnetic pole. Therefore, a space for installing the inner core is required in the linear motor compressor, and thus, the size of the compressor is increased as much as the space. Even though the permanent magnet shaped as shown in Fig. 7 (b) is used, the inner and outer circumferential portions have different magnetic poles from each other. Thus, the inner core is also still required.
• the permanent magnet having magnetic pole distribution as shown in Fig. 7 (a) it is substantially difficult to manufacture the permanent magnet, using a common permanent magnetic material such as ferrite, NdFeB, Bonded or the like, such that the volume of magnetic poles arranged on the inner circumference of the cylinder is identical to the volume of magnetic poles arranged on the outer circumference of the cylinder. Due to the unbalance of volumes of the magnetic poles, a permanent magnet cannot be magnetized to exhibit maximum magnetic force when being manufactured. Therefore, there are problems in that the coercive force is smaller than the permanent magnets of which shape is different but the size is identical and the magnetic force is rapidly decreased over time. As for the permanent magnet shaped as shown in Fig.
• the present invention is conceived to solve the aforementioned problems of the conventional linear motor compressor.
• An object of the present invention is to provide a linear motor compressor which can be manufactured in a compact design since it is not necessary to use an auxiliary core by changing the shape of a permanent magnet.
• another object of the present invention is to provide a linear motor compressor of which output of electric power can be enhanced by increasing a magnetizing force of the permanent magnet to the utmost.
• a still object of the present invention is to provide a linear motor compressor with an output of electric power of at least 1 ,200 Watts, which can be commercially mass-produced. [Technical Solution]
• a linear motor compressor comprising a compressor including a cylinder, a piston inserted into one side of the cylinder to be able to reciprocate, a cylinder head fixed to the other side of the cylinder to define a compression chamber between the inside of the cylinder and the piston, a suction valve installed to cause a working fluid to be introduced into the compression chamber when the piston moves backward, and a discharge valve installed to discharge the working fluid compressed in the compression chamber to the outside when the piston moves forward; a resonant spring for supporting the piston to reciprocate; and a linear motor including a permanent magnet connected and fixed to the piston to reciprocate together with the piston and formed with different magnetic poles arranged along a reciprocating direction of the piston, and a plurality of electromagnets fixed without performing relative motion with respect to the cylinder and formed with magnetic poles spaced apart from the magnetic poles of the permanent magnet at regular intervals.
• the plurality of electromagnets of the linear motor are arranged to allow an alternating thrust force to be imparted to the permanent magnet due to attractive and repulsive forces of the magnetic poles of the electromagnets against the magnetic poles of the permanent magnet when the electromagnets are excited by an AC electrical current.
• the permanent magnet is cylindrical and is fixed to the piston such that a central axis thereof is coincident with a central axis of the reciprocating direction of the piston.
• a pair of electromagnets may be arranged adjacent to each other such that the linear motor compressor can be manufactured in a compact design.
• a first electromagnet may include a first core which accommodates one of the magnetic poles of the permanent magnet within a hollow space thereof and is formed with a circumferential slot on an inner circumference of the hollow space spaced apart from an outer circumference of the accommodated permanent magnet by a predetermined gap to form a pair of magnetic poles thereon and formed by stacking ferromagnetic plates, and a first coil wound within the interior of the first core.
• a second electromagnet may include a second core which accommodates the other magnetic pole of the permanent magnet within a hollow space thereof and is formed with a circumferential slot on an inner circumference of the hollow space spaced apart from an outer circumference of the accommodated permanent magnet by the predetermined gap to form a pair of magnetic poles and formed by stacking ferromagnetic plates, and a second coil wound within the interior of the second core in a direction opposite to the wound direction of the first coil.
• the first and second electromagnets are arranged adjacent to each other such that a reciprocating stroke of the piston is the same as a length of one magnetic pole of the permanent magnet.
• the slot may be formed in the middle of each of the cores of the electromagnets in a longitudinal direction of the core, and the core may have the substantially same length as that of the cylindrical permanent magnet.
• the linear motor compressor employs a permanent magnet which is fixed to a piston to reciprocate together with the piston and has different magnetic poles arranged along a reciprocating direction of the piston and is configured to allow a plurality of electromagnets to impart an alternating thrust force to the permanent magnet. Therefore, a compact linear motor compressor can be manufactured because a separate auxiliary core is not necessary, hi addition, the linear motor compressor of the present invention can be configured such that volumes of the different magnetic poles are substantially same as each other, since different magnetic poles of the permanent magnet are arranged in a longitudinal direction. Therefore, a permanent magnet with a great coercive force can be manufactured, and thus, the output of power of the linear motor compressor can be further increased as compared with a conventional linear motor compressor.
• FIG. 1 is a schematic view of a linear motor compressor according to an embodiment of the present invention.
• Fig. 2 is a sectional view of a linear motor compressor according to another embodiment of the present invention.
• Fig. 3 is a sectional view of a linear motor compressor according to a further embodiment of the present invention.
• Fig. 4 is a perspective view of a permanent magnet used in the linear motor compressor shown in Figs. 2 and.
• Fig. 5 is a view illustrating an operating principle of the linear motor compressor shown in Fig. 3.
• Fig. 6 is a schematic sectional view of a conventional linear motor compressor.
• Fig. 7 (a) and (b) is a perspective view of a permanent magnet used in the conventional linear motor compressor shown in Fig. 6.
• Fig. 8 is a view illustrating an operating principle of the conventional linear motor compressor shown in Fig. 6.
• Fig. 1 is a schematic view showing a linear motor compressor according to an embodiment of the present invention.
• the linear motor compressor of this embodiment includes a compressor C fixed to a frame F, a linear motor L which imparts alternating a thrust force to a piston 2 in order to reciprocate the piston 2 of the compressor C, and a resonant spring 6 of which one end is connected to the piston 2 and the other end is fixed to the frame F in order to support the piston 2 that reciprocates.
• the piston 2 of the compressor C is inserted into one side of a cylinder 1 fixed to the frame F such that it can reciprocate in the cylinder.
• a cylinder head 3 is fixed to the other side of the cylinder 1 and defines a compression chamber CV between the inside of the cylinder and the piston 2.
• suction and discharge holes 3a and 3b are formed in the cylinder head 3, and suction and discharge valves 4 and 5 are installed to the suction and discharge holes.
• the suction valve 4 is configured such that it is opened when the piston moves backward and a pressure in the compression chamber CV is then decreased below than a predetermined value and that it is closed when the piston moves forward.
• the discharge valve 5 is configured such that it is closed when the piston 2 moves backward and that it is opened to discharge a working fluid when the piston 2 moves forward and the pressure in the compression chamber CV is then increased over a predetermined value.
• the linear motor L includes a permanent magnet 7 which is supported on a permanent magnet support 7b and fixed to the piston 2, and a pair of electromagnets 8 and 9 which are fixed to the frame F to be spaced apart from magnetic poles 7a of the permanent magnet 7 by a predetermined distance.
• the permanent magnet support 7b is made of a non-magnetic material such as aluminum.
• the support 7b is fixed to the piston 2 in a state where it surrounds the permanent magnet except the magnetic poles 7a, as shown in Fig. 1.
• the permanent magnet 7 is shaped as a plate, and the magnetic poles 7a with different polarities (N, S) are arranged along a direction (a direction designated by an arrow) in which the piston 7 reciprocates.
• Each of the pair of electromagnets 8 and 9 is configured such that a coil 8a or 9a is wound in the same direction around a core formed by stacking metal plates made of ferromagnetic materials.
• the magnetic poles 8a and 9a arranged in parallel with the magnetic poles 7a of the permanent magnet 7 alternate at the same frequency and have the same magnetic polarity as the AC electric power.
• each of the electromagnets 8 and 9 is arranged to at least partially face the different poles of the permanent magnet.
• the magnetic poles 8a and 9a of the electromagnets 8 and 9 exerts attractive and repulsive forces to the magnetic poles 7a of the permanent magnet 7, respectively, to impart an alternating thrust force to the permanent magnet 7.
• the permanent magnet 7 arranged as shown in Fig. 1 is subjected to a thrust force in a right direction as viewed from the figure, while both of them have S polarity, a thrust force in a left direction is exerted thereto.
• a length of the electromagnet 8 or 9 in a direction in which the piston 2 reciprocates is identical to a length of a single magnetic pole of the permanent magnet 7, and the electromagnets 8 and 9 are installed to be spaced apart from each other by the length of one magnetic pole of the permanent magnet 7. Therefore, a maximum stroke of the piston 2 becomes the same as the length of one magnetic pole of the permanent magnet 7.
• Fig. 2 is a sectional view showing a linear motor compressor according to another embodiment of the present invention.
• the linear motor compressor of this embodiment includes a compressor 10, a linear motor 20 for imparting an alternating thrust force to a piston 12 to cause the piston 12 of the compressor 10 to reciprocate, and a resonant spring 30 for guiding the reciprocating motion of the piston 12.
• the compressor 10 includes a cylinder 11, a piston 12 inserted into one side of the cylinder 11 to be able to reciprocate, and a cylinder head 13 fixed to the other side of the cylinder 11 to define a compression chamber CV between the inside of the cylinder and the piston 12.
• a discharge hole 13a is formed in the cylinder head 13, and a discharge valve 14 is installed to the discharge hole 13 a.
• the piston 12 is hollow.
• a suction hole 12a with a reduced diameter is formed in an end of the piston in a direction in which the piston is inserted into the cylinder, and a suction valve 15 is installed to the suction hole 12a.
• the suction valve 15 is configured such that it is opened to allow a working fluid to be introduced into the compression chamber CV when the piston 12 moves backward and the pressure in the compression chamber is decreased below a predetermined value, and that it is closed when the piston 12 moves forward.
• the discharge valve 14 is configured such that it is closed when the piston 12 moves backward, and that it is opened to discharge the working fluid to the outside when the piston 12 moves forward and the pressure in the compression chamber CV is increased over a predetermined value.
• the linear motor 20 includes a cylindrical permanent magnet 27 inserted into and closely fixed to the outer circumference of a flange 28a of a permanent magnet support 28, and a pair of electromagnets 23 and 26 arranged to be spaced apart by a predetermined gap 40 from different magnetic poles 27a and 27b placed on the outer circumference of the permanent magnet 27.
• the permanent magnet support 28 is made of a non-magnetic material such as aluminum and is composed of a fixing portion 28c into which the piston 12 is inserted and fixed, a neck portion 28b extending from the fixing portion 28c in a radial direction to support the resonant spring 30, and a flange 28a which extends from the neck portion 28 in a reciprocating direction of the piston such that the inner circumference of the permanent magnet is closely fixed thereto.
• the permanent magnet 27 of this embodiment is shaped in the form of a cylinder as shown in Fig. 4 and is fixed to the permanent magnet support 28 in a state where its central axis is coincident with a central axis of the reciprocating direction of the piston.
• the permanent magnet 27 of this embodiment includes the different magnetic poles 27a and 27b formed in its longitudinal direction, the magnet can be manufactured such that the volumes of the different magnetic poles are the same as each other unlike a permanent magnet used in a conventional linear motor shown in Fig. 7. Therefore, since it is possible to manufacture a permanent magnet with a great coercive force, a linear motor compressor with greater output of electric power can be accomplished.
• the first and second electromagnets 23 and 26 are cylindrical and arranged adjacent to each other in an axial direction.
• the first electromagnet 23 accommodates one magnetic pole 27a of the permanent magnet 27 in its hollow space
• the second electromagnet accommodates the other magnetic pole 27b in its hollow space.
• the first and second electromagnets 23 and 26 include first and second cores 22 and 25, and first and second coils 21 and 24, respectively.
• the first and second cores 22 and 25 have the inner circumferences arranged to be spaced apart by the predetermined gap 40 from the outer circumference of the permanent magnet 27, respectively.
• the first and second coils 21 and 24 are wound within the first and second cores 22 and 25, respectively.
• first and second cores 22 and 25 have circumferential slots 22c and 25c such that a pair of different magnetic pole surfaces can be formed in the inner circumference thereof, respectively, when current flows in the coils.
• the first and second cores 22 and 25 are formed by stacking ferromagnetic metal plates from which both a portion corresponding to a space where the coils will be wound and a portion where the slot is formed are removed.
• each of the slots 22c and 25c formed in the cores 22 and 25 is formed in the middle of the core in a longitudinal direction, and the length of the core 22 or 25 of the electromagnet 23 or 26 is substantially equal to that of the cylindrical permanent magnet 27.
• the elasticity of resonant springs 31 and 32 is adjusted such that the permanent magnet 27 is slightly offset from the center of the pair of electromagnets 23 and 26 at a stopped state.
• the linear motor 20 of this embodiment is configured such that the permanent magnet 27 to which different magnetic poles are magnetized in a longitudinal direction is arranged along a reciprocating direction of the piston 12 and an alternating thrust force is exerted to the permanent magnet 27 by means of the first and second electromagnets 23 and 26 with the coils wound in opposite directions, as shown in Fig. 7. Therefore, since a separate auxiliary core is not necessary unlike the conventional linear motor as shown in Fig. 6, the compressor of the present invention can be manufactured in a compact design.
• the compressor 10 and the linear motor 20 are firmly fixed to each other by means of a cylinder housing 50 and a housing cover 60.
• the cylinder 11 and the cylinder head 13 are inserted and fixed into a support hole 52 formed at one side of the cylinder housing 50.
• the cylinder housing 50 and the cylinder cover 60 take the shape of a disk, and the first and second electromagnets 23 and 26 are inserted and closely fixed between them.
• the cylinder housing 50 and the cylinder cover 60 which are closely fixed to the cores 22 and 25 of the electromagnets 23 and 26, respectively, are made of aluminum that is a non-magnetic material.
• a through- hole 62 is formed at the center of the housing cover 60 such that a working fluid can flow into a hollow space of the piston.
• one end of the first resonant spring is inserted into and supported by a spring support groove 51 formed in the cylinder housing 50, and the other end of the first resonant spring is supported on the neck portion 28b at one side of the permanent magnet support 28.
• one end of the second resonant spring is inserted into and supported by a spring support groove 61 of the housing cover 60, and the other end of the second resonant spring is supported on the neck portion 28b at the other side of the permanent magnet support 28.
• the first and second coils 21 and 24 are wound in opposite directions as designated by a current direction symbol of Fig. 2.
• both magnetic poles 22a and 22b of the first electromagnet 23 and magnetic poles 25 a and 25b of the second electromagnet 26, which are arranged in parallel with the magnetic poles 27a and 27b of the permanent magnet 27 by a predetermined gap 40, are formed to alternate at the same frequency as the AC electric power.
• the magnetic poles 22a and 22b of the first electromagnet 23 are excited in the order of S - N at by AC electric power supplied with a certain phase, the magnetic poles 25a and 25b of the adjacent second electromagnet 26 are excited in the reverse order of N - S.
• the magnetic poles 22b and 25b of the electromagnets facing the magnetic poles 27a and 27b of the permanent magnet 27 have the same N polarity when the AC electric power with the same phase is supplied to the electromagnets 23 and 26 at a stopped state, repulsive and attractive forces are exerted to the magnetic poles 27a and 27b of the permanent magnet 27, respectively, to thereby generate a thrust force for pushing the permanent magnet in one direction.
• the magnetic pole 22a of the first electromagnet 22 adjacent to the moving direction of the permanent magnet 27 also imparts an attractive force to the permanent magnet 27.
• the piston 12 connected to the permanent magnet 27 is moved rightward.
• the kinetic energy of the piston 12 is stored in the resonant spring 31 as elastic energy. If the phase of the AC electric power is changed reversely, the polarities of the magnetic poles 22a, 22b, 25a and 25b of the electromagnets 23 and 26 are also changed reversely, and a thrust force is then applied to the permanent magnet 27 in a direction opposite to the moving direction of the permanent magnet 27.
• Fig. 3 is a sectional view showing a linear motor compressor according to a further embodiment of the present invention. The compressor shown in Fig. 3 is different from the compressor shown Fig.
• first and second cores are formed by integrating four parts in order to facilitate easy manufacture and cost reduction. That is, a pair of electromagnet cores are formed by using a pair of symmetrical outer cores 72 and 74, a central core 73 and a cover core 71.
• Other configurations and advantageous effects are identical to those of the linear motor compressor shown in Fig. 2, and thus, descriptions and reference numerals thereof will be omitted herein.
• Fig. 5 illustrates an operating principle of the linear motor compressor shown in Fig. 3 according to phase change of the AC electric power applied thereto. If the AC electric power is supplied to a pair of adjacent electromagnets with coils wound in opposite directions, the polarities of the magnetic poles of the electromagnets are changed alternately. As shown in Fig. 5, the polarities of the magnetic poles 22a, 22b, 25b and 25a are in the order of S - N - N - S or are alternately changed in the order of N - S - S - N. In a case where the magnetic poles 22a, 22b, 25b and 25a are arranged in the order of S - N - N - S (in regions of Fig.
• the electromagnets impart a thrust force to the permanent magnet 27 in a direction of a leftward arrow as viewed on this figure.
• the electromagnets impart a thrust force to the permanent magnet 52 in a direction of a rightward arrow as viewed on this figure.
• the elastic energy stored in the resonant springs acts as a recovery force to cause the permanent magnet to be restored to its initial position.
• the reciprocation frequency of the permanent magnet 27 in the right and left direction is synchronized with the frequency of the AC electric power, and thus, one cycle of the supplied electric power corresponds to one cycle of the reciprocation of the piston. That is, the piston 12 connected to the permanent magnet 27 reciprocates in the cylinder 11 at the same frequency as the supplied AC electric power. Therefore, the working fluid supplied into the compression chamber through a suction valve of the piston is compressed in the compression chamber and then discharged to the outside through the discharge valve of the cylinder head.
• the linear motor compressor of the present invention can be used as a compressor for a refrigerator or freezer. If air is used as the working fluid, the linear motor compressor of the present invention can be used as a compressor for use in an apparatus for supplying high-pressure air.
• a linear motor compressor comprises a permanent magnet which is fixed to a piston to reciprocate together with the piston and has different magnetic poles arranged along a reciprocating direction of the piston, and a plurality of electromagnets which are arranged to impart an alternating thrust force to the permanent magnet.
• the linear motor compressor of the present invention can have a compact design because a separate auxiliary core is not necessary.
• the output of power from the linear motor compressor can be further increased as compared with a conventional linear motor compressor.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=36578075

Family Applications (1)

Country Status (2)

Cited By (10)

Families Citing this family (1)

Citations (7)

• 2004
  • 2004-12-09 KR KR1020040103377A patent/KR100582754B1/ko active IP Right Grant
• 2005
  • 2005-06-17 WO PCT/KR2005/001873 patent/WO2006062276A1/en active Application Filing

Patent Citations (7)

Also Published As

Similar Documents

Legal Events