CN110043443B - Moving-magnet linear compressor - Google Patents
Moving-magnet linear compressor Download PDFInfo
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- CN110043443B CN110043443B CN201910319746.1A CN201910319746A CN110043443B CN 110043443 B CN110043443 B CN 110043443B CN 201910319746 A CN201910319746 A CN 201910319746A CN 110043443 B CN110043443 B CN 110043443B
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- permanent magnet
- valve plate
- yoke iron
- compressor
- motor shaft
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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
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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
- 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
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
- F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
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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
- 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
- F04B39/0088—Pulsation and noise damping means using mechanical tuned resonators
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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
- 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
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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
- 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
- F04B39/123—Fluid connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention provides a moving-magnet linear compressor, which comprises a compressor shell, a stator assembly and a rotor assembly, wherein the stator assembly comprises an inner yoke iron positioned on the central axis of the compressor shell, an outer yoke iron arranged around the inner yoke iron, and a motor fixing frame for fixing the inner yoke iron and the outer yoke iron, and the motor fixing frame is elastically supported on the inner wall of the compressor shell through a damping supporting piece; the permanent magnet support is embedded with a permanent magnet magnetic block, the permanent magnet magnetic block can penetrate through a gap between the inner yoke iron and the outer yoke iron to reciprocate, the reciprocating motion of the permanent magnet magnetic block drives the permanent magnet support and the linear motor shaft to move, further, a piston of the cylinder is driven to compress gas to work, and low-temperature and low-pressure refrigerant gas is compressed into high-temperature and high-pressure refrigerant gas. According to the invention, by optimizing the structures of a plurality of parts, the effects of compact structure, stable connection, high operation efficiency, low noise and long service life of the compressor are realized.
Description
Technical Field
The invention relates to the technical field of linear compressors, in particular to a moving magnet type linear compressor.
Background
The compressor is a heart of a refrigeration system, is a driven fluid machine for lifting low-pressure gas into high-pressure gas, sucks low-temperature low-pressure refrigerant gas from an air suction pipe, drives a piston to compress the refrigerant gas through the driving of a motor, and discharges the high-temperature high-pressure refrigerant gas to an exhaust pipe to provide power for a refrigeration cycle. At present, most of refrigeration equipment such as refrigerators, air conditioners and the like in China adopt rotary compressors, the compressors adopt traditional rotary motors as driving sources, and the rotary motion of the motors is converted into the linear reciprocating motion of pistons by utilizing a crank-link mechanism.
In contrast, the reciprocating linear compressor driven by the linear motor receives more and more attention, and the reciprocating linear compressor can omit a crank link mechanism, reduce friction loss and improve system efficiency and reliability. The linear compressor mainly includes the following types according to the types of linear motors used: moving coil type, moving iron type, moving magnet type, and moving magnet type. Compared with other types of compressors, the moving magnet type linear compressor has the advantages of compact structure, smaller volume, higher power and higher efficiency.
In order to further improve the performance and the operation efficiency of the compressor and prolong the service life, the structure of the compressor needs to be further optimized and designed on the basis of the structure of the existing compressor, so that the structure of the compressor is more compact, the air gap is reduced, and the specific thrust of the motor is increased.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a moving magnet linear compressor with a novel structure, in which a permanent magnet block is supported by a permanent magnet support, so as to reduce an air gap, greatly reduce the possibility of magnetic leakage, and increase the specific thrust of a motor.
In order to achieve the above object, the present invention provides a moving-magnet linear compressor, comprising a compressor housing, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are located in the compressor housing, the stator assembly comprises an inner yoke iron located on a central axis of the compressor housing, an outer yoke iron arranged around the inner yoke iron, and a motor fixing frame for fixing the inner yoke iron and the outer yoke iron, and the motor fixing frame is elastically supported on an inner wall of the compressor housing through a shock-absorbing support;
the rotor assembly comprises a linear motor shaft axially penetrating through the inner yoke iron, a permanent magnet support, a plate spring and a resonant cylindrical spring, wherein the permanent magnet support is positioned between the inner yoke iron and the outer yoke iron and is connected with the linear motor shaft;
the permanent magnet support is embedded with a permanent magnet magnetic block, the permanent magnet magnetic block can penetrate through a gap between the inner yoke iron and the outer yoke iron to reciprocate, the reciprocating motion of the permanent magnet magnetic block drives the permanent magnet support and the linear motor shaft to move, further, a piston of the cylinder is driven to compress gas to work, and low-temperature and low-pressure refrigerant gas is compressed into high-temperature and high-pressure refrigerant gas.
Furthermore, a suction and exhaust assembly for reducing the working noise of the compressor is also arranged in the compressor shell;
the air suction and exhaust assembly comprises an air suction valve plate, an exhaust valve plate, an air cylinder air inlet plug and an exhaust silencer, wherein the air suction valve plate and the exhaust valve plate are fixed on the end surface of the piston through check screws;
the air inlet plug of the air cylinder is plugged into the air cylinder from the bottom of the air cylinder.
Further, the exhaust muffler divide into two parts, and one of them part is the hemisphere cavity, and another part is the cylindrical cavity of ladder for having the blast pipe, wherein the bottom of hemisphere cavity with the upper surface laminating of cylinder, the bottom of the cylindrical cavity of ladder with along the laminating on the surface of hemisphere cavity, through the lower extreme that compresses tightly the lid and the upper surface laminating of cylinder, compress tightly to cover threaded connection have a locking cap, with the blast pipe compress tightly in locking cap with between the extension pipe of the cylindrical cavity of ladder.
Preferably, the inner coil and the outer coil are respectively wound on the die cavities of the inner yoke iron and the outer yoke iron;
the outer yoke is formed by superposing a plurality of E-shaped silicon steel sheets, circular arc-shaped flanges are arranged at two ends of the E-shaped outer yoke, and the wound outer coil can be directly led out of the outer yoke;
and a lead slot is arranged at the boss of the inner yoke, and the wound inner coil is led out through the lead slot.
Preferably, the right end of the permanent magnet support is attached to a shaft shoulder of the linear motor shaft, the left end of the permanent magnet support is fixedly connected with a permanent magnet support plug, and the center of the permanent magnet support plug is fixedly connected with the linear motor shaft;
a stepped shaft sleeve is sleeved on the outer diameter of the piston rod, and the right end face of the stepped shaft sleeve is attached to the end face of the linear motor shaft;
the plate spring comprises a left plate spring and a right plate spring which are respectively positioned at the left end and the right end of the linear motor shaft, and the outer ring of the left plate spring is fixedly connected with the right end cover and the right motor fixing frame; and the outer ring of the left plate spring is fixedly connected with the left motor fixing frame, the left end cover and the transition support frame.
Furthermore, the center part of the left plate spring is attached to the end parts of the stepped shaft sleeve and the left cylindrical spring seat, and the center part of the right plate spring is attached to the shaft shoulder of the linear motor shaft and the end part of the right cylindrical spring seat;
the resonance cylindrical spring comprises a left resonance cylindrical spring and a right resonance cylindrical spring, and two ends of the right resonance cylindrical spring are respectively and fixedly contacted with the grooves in the middle parts of the right cylindrical spring seat and the right end cover; two ends of the left resonance cylindrical spring are respectively and fixedly contacted with the left cylindrical spring seat and a groove in the middle of the left end cover;
the right cylindrical spring seat is locked on the linear motor shaft through a nut.
Preferably, the upper end and the lower end of the motor fixing frame are respectively provided with two cylindrical flanges for connecting with the damping support piece, four groups of bosses are arranged at the side end of the motor fixing frame, each group of two bosses are parallel to each other, the distance between every two bosses is equal to the width of the cross section of the outer yoke, and the outer yoke is arranged in the groove of the motor fixing frame and then is fixed and clamped by the bosses.
Optionally, the permanent magnet support is in a cylindrical fence shape, and a mounting groove for mounting the permanent magnet block is formed in the middle of the permanent magnet support; the permanent magnet magnetic block is arc-shaped and is hinged to the mounting groove on the permanent magnet support.
Furthermore, involute grooves are processed on the surface of the plate spring and are uniformly distributed on the plate spring in a circumferential array mode, and the uniformly distributed involute grooves enable the radial force of gas on the plate spring to be mutually offset in the working process of the compressor.
Optionally, the suction valve plate and the exhaust valve plate are of a four-column structure, a mounting hole is formed in the middle of the suction valve plate and the exhaust valve plate, and the structure of the contact position of the mounting hole and the air inlet hole of the piston is circular and used for optimizing the opening pressure of the suction valve plate and the exhaust valve plate;
the air suction valve plate and the air exhaust valve plate are tightly pressed at the front end of the piston through a set screw, and the front end of the air cylinder is provided with an air exhaust hole for exhausting high-pressure air; the exhaust valve plate is tightly attached to the upper side of the cylinder, and when the gas pressure reaches the opening pressure of the exhaust valve plate, the exhaust valve plate is opened and exhausts through the notch of the exhaust valve plate.
In addition, the movable magnetic compressor with the novel structure has good axial support and radial support through a resonant spring system formed by the flexible plate spring and the resonant cylindrical spring, the resonant spring system formed by the flexible plate spring and the cylindrical spring can provide certain restoring force for the rotor in the working process of the compressor and has the function of preventing the compressor from colliding with a cylinder, and the whole compressor system can achieve a more ideal resonant working state through the resonant spring system. The round hole in the plate spring outside passes through the screw connection with the screw hole on the motor mount for the close laminating in surface of plate spring and motor mount is in the same place, and the plate spring atress is even, and the round hole in the middle of the plate spring has played certain radial supporting role to piston rod and linear motor axle simultaneously, and resonance cylindrical spring installs between the recess of spring holder and end cover, and it has great rigidity, has played stronger axial supporting role. Through each part in the air suction and exhaust assembly, the structure optimization design is carried out, so that the whole air suction and exhaust part has a good noise reduction effect, and the noise is controlled by the arrangement of the air suction and exhaust assembly.
Drawings
Fig. 1 is a schematic sectional view showing an overall structure of a moving magnet type linear compressor according to the present invention;
fig. 2 is a perspective view of an internal overall structure of the moving magnet type linear compressor of the present invention;
fig. 3 is a left side view of the internal overall structure of the moving magnet type linear compressor of the present invention;
fig. 4 is a right side view of the internal overall structure of the moving magnet type linear compressor of the present invention;
fig. 5 is a sectional view of an intermediate position of the internal overall structure of the moving magnet type linear compressor of the present invention;
fig. 6 is a sectional view of another intermediate position of the internal overall structure of the moving magnet type linear compressor of the present invention.
In the figure, 1, a compressor housing; 2. an exhaust pipe; 3. a locking cap; 4. a compression cover; 5, 6, an exhaust silencer; 7. an exhaust valve plate; 8. a cylinder; 9. an air suction valve plate; 10. a piston rod of the cylinder; 11. an air inlet plug of the cylinder; 12. a shock absorbing support; 13. a plate spring; 14. a right cylindrical spring seat; 15. a right end cap; 16. a resonant cylindrical spring; 17. a linear motor shaft; 18. a permanent magnet support; 19. a right motor fixing frame; 20. an inner yoke iron; 21. a permanent magnet magnetic block; 22. an outer yoke; 23. an inner coil; 24. an outer coil; 25. a left motor fixing frame; 26. a transition support frame; 27. a permanent magnet bracket plug; 28. a stepped shaft sleeve; 29. a left cylindrical spring seat; 30. a left end cap; 31. and (4) sucking a pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
It should be noted that all the directional indicators (such as outer, inner, left and right … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly. Where "left" corresponds to the left side in fig. 1 and "right" corresponds to the right side in fig. 1.
Referring to fig. 1 to 6, the moving magnet type linear compressor of the present invention will be described in detail, and the moving magnet type linear compressor of the present invention is generally applied to a refrigeration apparatus such as a refrigerator and an air conditioner.
The moving magnet type linear compressor comprises a compressor shell 1, a damping support member 12, a rotor assembly, an air suction and exhaust assembly, a stator assembly and end covers 15 and 30, wherein the stator assembly comprises an inner yoke iron 20, an inner coil 23, an outer coil 24, an outer yoke iron 22 and motor fixing frames 19 and 25, the motor fixing frames 19 and 25 are fixedly connected to the compressor shell 1 through the damping support member 12, two elastic support mounting grooves are respectively formed in the upper side and the lower side of the interior of the compressor shell 1 and used for fixing the damping support member 12, and the damping support member 12 can be a rubber type elastic support member. The inner coil 23 and the outer coil 24 are respectively wound on the cavities where the inner yoke iron 20 and the outer yoke iron 22 are respectively located, and the outer yoke iron 22 and the inner yoke iron 20 are both fixed on the motor fixing frames 19 and 25.
The upper and lower ends of the motor fixing frames 19, 25 of the invention are respectively provided with two cylindrical flanges which are used for connecting with the damping support piece 12, the side end of the motor fixing frame is provided with four groups of bosses, each group of two bosses are parallel, and the distance between the bosses is equal to the section width of the outer yoke iron 22. The inner sides of the outer ring and the inner ring of the motor fixing frames 19 and 25 are respectively provided with a groove for fixing and supporting the outer yoke 22 and the inner yoke 20, and the outer yoke 22 is arranged in the grooves of the motor fixing frames 19 and 25 and then is fixed and clamped by the bosses. The outer yoke 22 is formed by overlapping a plurality of E-shaped silicon steel sheets, circular arc-shaped flanges are arranged at two ends of the E-shaped outer yoke 22, and the wound outer coil 24 can be directly led out from the outer yoke 22. The inner coil 23 and the outer coil 24 are divided into an inner yoke iron coil and an outer yoke iron coil, the outer yoke iron coil is wound in a cavity of the outer yoke iron 22, the inner yoke iron coil is wound in a cavity of the inner yoke iron 20, a lead slot is formed in a boss of the inner yoke iron 20, and the wound inner yoke iron coil is led out through the lead slot of the inner yoke iron 20.
The rotor component of the invention comprises a piston arranged in a cylinder 8, a linear motor shaft 17, a permanent magnet block 21, a permanent magnet bracket 18, a permanent magnet bracket plug 27, a plate spring 13, a resonant cylindrical spring 16 and a stepped shaft sleeve 28, wherein, the linear motor shaft 17 is located on the central axis of the inner yoke iron 20, the permanent magnet magnetic block 21 is embedded on the side wall of the permanent magnet bracket 18 and can pass through the gap between the inner yoke iron 20 and the outer yoke iron 22 to reciprocate, the right end of the permanent magnet bracket 18 is attached to the shaft shoulder of the linear motor shaft 17, the left end of the permanent magnet bracket plug 27 is fixedly connected, the outer ring of the permanent magnet bracket plug 27 is matched and connected with the permanent magnet bracket 18, the inner hole of the permanent magnet support plug 27 is fixedly connected with the linear motor shaft 17, and the permanent magnet support plug and the linear motor shaft 17 respectively play a role in fixedly supporting the permanent magnet support 18 and the linear motor shaft 17. The piston rod 10 of the air cylinder 8 is connected with the left end of the linear motor shaft 17 in a threaded connection mode, the stepped shaft sleeve 28 is sleeved on the outer diameter of the piston rod 10, and the right end face of the stepped shaft sleeve 28 is attached to the end face of the linear motor shaft 17.
The outer ring of the plate spring 13 is fixedly connected with the end covers 15 and 30, the motor fixing frames 19 and 25 and the transition support frame 26 (without a transition support frame on the right side), and the outer parts of the two ends of the transition support frame 26 are respectively provided with a round hole-shaped connecting part for fixing the plate spring 13 (on the left side) and the left end cover 30 with the motor fixing frame 25. The end parts of the motor fixing frames 19 and 25, the transition supporting frame 26 and the end covers 15 and 30 are respectively provided with a threaded connecting hole, and the periphery of the plate spring 13 is provided with a round hole and is connected together through a screw. The center part of the plate spring 13 (left side) is attached to the end parts of the stepped shaft sleeve 28 and the left cylindrical spring seat 29, the center part of the plate spring 13 (right side) is attached to the shaft shoulder of the linear motor shaft 17 and the end part of the right cylindrical spring seat 14, two ends of the resonance cylindrical spring 16 are respectively in fixed contact with the cylindrical spring seats 14 and 29 and the grooves in the middle parts of the end covers 15 and 30, the resonance cylindrical spring 16 is a cylindrical spring with two horizontal ends, and the resonance cylindrical spring is used for enabling the cylindrical spring to be in full contact with the cylindrical spring seats 14 and 29. The right cylindrical spring seat 14 is locked on a linear motor shaft 17 through a nut. Wherein the bottom end of the left cylindrical spring seat 29 is provided with a bulge and the bottom end of the right cylindrical spring seat 14 is horizontal.
The air suction and exhaust assembly comprises an air suction valve plate 9, an exhaust valve plate 7, an air cylinder air inlet plug 11, an exhaust silencer 5, 6, a locking cap 3 and a pressing cover 4, wherein an air cylinder 8 in a compressor shell 1 is fixed in a central hole of a left end cover 30, the air suction valve plate 9 and the exhaust valve plate 7 are fixed on the upper end surface of a piston of the air cylinder 8 through locking screws, the air cylinder air inlet plug 11 is plugged into the air cylinder 8 from the bottom of the air cylinder, four air inlet holes are uniformly distributed in the circumferential direction of the air cylinder air inlet plug 11, the front end of the piston is provided with air inlet and exhaust holes which are arranged in the circumferential direction, the central position of the air inlet and exhaust holes is provided with internal threads which are tightly connected with a piston rod. Exhaust muffler 5, 6 divide into two parts, and one of them part is the hemisphere cavity, and another part is the cylindrical cavity of ladder for having blast pipe 2, wherein the bottom of hemisphere cavity and the upper surface laminating of cylinder 8, the bottom of the cylindrical cavity of ladder with along the laminating on the surface of hemisphere cavity, through the lower extreme that compresses tightly lid 4 and the upper surface laminating of cylinder 8, locking cap 3 carries out threaded connection with compressing tightly lid 4, with blast pipe 2 compress tightly in between the extension pipe of locking cap 3 and the cylindrical cavity of notch cuttype. Therefore, the structures of the exhaust silencers 5 and 6 are concave and convex, and the structures of the silencers are optimally designed through analysis of a gas loop and a flow field, so that the noise is minimized.
In addition, the permanent magnet support 18 is in a cylindrical fence shape, the middle position of the permanent magnet support is provided with a mounting groove for mounting and fixing the permanent magnet block 21, the permanent magnet block 21 is hinged with the mounting groove on the permanent magnet support 18, and the permanent magnet block 21 is in an arc shape.
The linear motor shaft 17 is a stepped shaft (a variable diameter shaft), the right end of the shaft is provided with an external thread and is used for fixing the plate spring 13 and the right spring seat 14, the left end of the shaft is provided with a counter bore internal thread and is used for being connected with the external thread on the piston rod 10, and the middle part of the shaft is provided with a transition shaft shoulder and is used for fixing the permanent magnet support 18. The stepped shaft sleeve 28 belongs to a transition connection piece, and has a stepped structure, and the function of the stepped shaft sleeve is represented by a transition function and a supporting function for the plate spring 13.
The surface of the plate spring 13 is processed with involute grooves, the involute grooves are uniformly distributed on the plate spring 13 in a circumferential array mode, and the uniform distribution of the involute grooves enables the radial force of gas on the plate spring 13 to be mutually offset in the working process of the compressor.
The air suction valve plate 9 and the air discharge valve plate 7 are of four-column structures, the middle positions of the air suction valve plate and the air discharge valve plate are provided with mounting holes, the positions of the air suction valve plate and the air discharge valve plate, which are in contact with the air inlet hole of the piston, are circular, and the structures of the air suction valve plate and the air discharge valve plate are used for optimizing the opening pressure of the air suction valve plate. The air suction valve plate 9 and the air exhaust valve plate 7 are tightly pressed at the front end of the piston through set screws, and the front end of the cylinder 8 is provided with an air exhaust hole for exhausting high-pressure air; the exhaust valve plate 7 is tightly attached to the upper side of the cylinder 8, when the gas pressure reaches the opening pressure of the exhaust valve plate 7, the exhaust valve plate 7 is opened, and exhaust is conducted through the gap of the exhaust valve plate 7.
The whole working process of the moving-magnet linear compressor comprises the following steps: under the condition of alternating current passing through the inner coil 23 and the outer coil 24 of the compressor, the inner coil 23 and the outer coil 24 generate an alternating magnetic field, in this case, the direction of the magnetic field force applied to the permanent magnet block 21 on the permanent magnet support 18 is also constantly changed, and under the driving of the magnetic field force with the changed direction, the permanent magnet block 21 drives the permanent magnet support 18, so that the linear motor shaft 17 is driven to start to do reciprocating linear motion, the piston is driven to compress gas to work, and the piston moves to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas.
According to the invention, the permanent magnet magnetic block 21 is embedded into the permanent magnet support 18, so that the air gap is reduced, the specific thrust of the motor is increased, the connecting part is tightly attached to the plate spring and the motor fixing frame, the plate spring is uniformly stressed, and the arrangement of the air suction and exhaust assembly controls the noise. According to the invention, by optimizing the structures of a plurality of parts, the effects of compact structure, stable connection, high operation efficiency, low noise and long service life of the compressor are realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A moving-magnet linear compressor comprises a compressor shell (1), a stator component and a rotor component, wherein the stator component and the rotor component are positioned in the compressor shell (1), and the moving-magnet linear compressor is characterized in that:
the stator assembly comprises an inner yoke iron (20) positioned on the central axis of the compressor shell (1), an outer yoke iron (22) arranged around the inner yoke iron (20), and motor fixing frames (19, 25) for fixing the inner yoke iron (20) and the outer yoke iron (22), wherein the motor fixing frames (19, 25) are elastically supported on the inner wall of the compressor shell (1) through a damping support piece (12);
the rotor assembly comprises a linear motor shaft (17) axially penetrating through the inner yoke (20), a permanent magnet support (18) positioned between the inner yoke (20) and the outer yoke (22) and connected with the linear motor shaft (17), a plate spring (13) positioned at the end part of the linear motor shaft (17) and a resonant cylindrical spring (16), and the left end of the linear motor shaft (17) is connected with a piston rod (10) of a cylinder (8);
a permanent magnet magnetic block (21) is embedded in the permanent magnet support (18), the permanent magnet magnetic block (21) can pass through a gap between the inner yoke iron (20) and the outer yoke iron (22) to reciprocate, the reciprocating motion of the permanent magnet magnetic block (21) drives the permanent magnet support (18) and the linear motor shaft (17) to move, further drives a piston of the cylinder (8) to compress gas to work, and compresses low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas;
the compressor shell (1) is internally provided with an air suction and exhaust assembly for reducing the working noise of the compressor; the air suction and exhaust assembly comprises an air suction valve plate (9), an exhaust valve plate (7), an air cylinder air inlet plug (11) and exhaust silencers (5, 6), wherein the air suction valve plate (9) and the exhaust valve plate (7) are fixed on the end surface of the piston through anti-loosening screws; the air inlet plug (11) of the air cylinder is plugged into the air cylinder (8) from the bottom of the air cylinder (8);
exhaust muffler (5, 6) divide into two parts, and one of them part is the hemisphere cavity, and another part is the cylindrical cavity of ladder that has blast pipe (2), wherein the bottom of hemisphere cavity with the upper surface laminating of cylinder (8), the bottom of the cylindrical cavity of ladder with along the laminating on the surface of hemisphere cavity, through the lower extreme that compresses tightly lid (4) and the upper surface laminating of cylinder (8), it has locking cap (3) to compress tightly on lid (4) threaded connection, with blast pipe (2) compress tightly in locking cap (3) with between the stretch-out pipe of the cylindrical cavity of ladder.
2. Moving magnet linear compressor according to claim 1, characterized in that the inner yoke (20) and the outer yoke (22) are wound with an inner coil (23) and an outer coil (24) at the cavity, respectively;
the outer yoke (22) is formed by superposing a plurality of E-shaped silicon steel sheets, circular arc-shaped flanges are arranged at two ends of the E-shaped outer yoke (22), and the wound outer coil (24) can be directly led out from the outer yoke (22);
and a lead groove is formed in the boss of the inner yoke (20), and the wound inner coil (23) is led out through the lead groove.
3. The moving-magnet linear compressor according to claim 1, wherein the right end of the permanent magnet support (18) is attached to the shoulder of the linear motor shaft (17), the left end of the permanent magnet support is fixedly connected to a permanent magnet support plug (27), and the center of the permanent magnet support plug (27) is fixedly connected to the linear motor shaft (17);
a stepped shaft sleeve (28) is sleeved on the outer diameter of the piston rod (10), and the right end face of the stepped shaft sleeve (28) is attached to the end face of the linear motor shaft (17);
the plate spring (13) comprises a left plate spring and a right plate spring which are respectively positioned at the left end and the right end of the linear motor shaft (17), and the outer ring of the left plate spring is fixedly connected with a right end cover (15) and a right motor fixing frame (19); the outer ring of the left plate spring is fixedly connected with a left motor fixing frame (25), a left end cover (30) and a transition supporting frame (26).
4. Moving magnet linear compressor according to claim 3, characterized in that the central part of the left plate spring abuts against the stepped bushing (28) and the end of the left cylindrical spring seat (29), and the central part of the right plate spring abuts against the shoulder of the linear motor shaft (17) and the end of the right cylindrical spring seat (14);
the resonance cylindrical spring (16) comprises a left resonance cylindrical spring and a right resonance cylindrical spring, and two ends of the right resonance cylindrical spring are respectively and fixedly contacted with a groove in the middle of the right cylindrical spring seat (14) and the right end cover (15); two ends of the left resonance cylindrical spring are respectively and fixedly contacted with a groove in the middle of the left cylindrical spring seat (29) and the left end cover (30);
the right cylindrical spring seat (14) is locked on the linear motor shaft (17) through a nut.
5. Moving magnet linear compressor according to claim 1, characterized in that the motor holder (19, 25) has two cylindrical flanges at its upper and lower ends for connection to the shock absorbing support (12), and four sets of bosses are provided at its side ends, each set of two bosses being parallel to each other, the distance between each set of two bosses being equal to the cross-sectional width of the outer yoke (22), and the outer yoke (22) is fixed and clamped in position by the bosses after being mounted in the grooves of the motor holder (19, 25).
6. Moving magnet linear compressor according to claim 1, characterized in that the permanent magnet holder (18) is in the shape of a cylindrical fence with a mounting groove in its middle position for mounting the permanent magnet magnets (21); the permanent magnet magnetic block (21) is arc-shaped and is hinged to the mounting groove on the permanent magnet support (18).
7. The moving-magnet linear compressor according to claim 1, wherein involute grooves are machined on the surface of the plate spring (13) and are uniformly distributed on the plate spring (13) in a circumferential array manner, and the uniformly distributed involute grooves enable the radial force of gas on the plate spring (13) to be mutually counteracted in the working process of the compressor.
8. The moving-magnet linear compressor according to claim 1, wherein the suction valve plate (9) and the discharge valve plate (7) are of a four-column structure, and a mounting hole is formed in the middle of the suction valve plate and the discharge valve plate, and the contact position of the mounting hole and the air inlet hole of the piston is circular in structure and used for optimizing the opening pressure of the suction valve plate (9) and the discharge valve plate (7);
the air suction valve plate (9) and the air exhaust valve plate (7) are tightly pressed at the front end of the piston through a set screw, and the front end of the air cylinder (8) is provided with an air exhaust pipe (2) for exhausting high-pressure air; the exhaust valve plate (7) is tightly attached to the upper side of the cylinder (8), when the gas pressure reaches the opening pressure of the exhaust valve plate (7), the exhaust valve plate (7) is opened, and exhaust is conducted through the gap of the exhaust valve plate (7).
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| CN111306038A (en) * | 2020-03-23 | 2020-06-19 | 辽宁工程技术大学 | Linear moving-magnet compressor |
| CN112412742B (en) * | 2020-12-01 | 2022-09-02 | 辽宁工程技术大学 | Energy-saving linear compressor |
| CN112483352A (en) * | 2021-01-04 | 2021-03-12 | 辽宁工程技术大学 | Novel double-coil moving-magnet linear compressor |
| CN115182864A (en) * | 2022-06-16 | 2022-10-14 | 华中科技大学 | Integrated direct-drive dynamic negative pressure generating device and assembling method and application thereof |
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