CN102889192B - Linear compressor driven by moving magnet linear oscillating motor - Google Patents

Abstract

The invention relates to the technical field of linear compressors, and discloses a linear compressor driven by a moving magnet linear oscillating motor, including a moving magnet linear oscillating motor, a cylinder, a piston, a suction and exhaust device, and a resonant component; The oscillating motor includes a stator part, a mover part, a first fixed connector, a second fixed connector, and a third fixed connector; the piston is arranged on the mover part; the suction and exhaust device is arranged at the end of the cylinder; the resonance part is installed Between the mover part and the third fixed connection part; the stator part includes a first magnetic conductor in the middle with an excitation coil wound around the center column, and two second magnetic conductors located on both sides of the first magnetic conductor; the first Two symmetrical air gaps are formed between the magnetic conductor and the second magnetic conductors on both sides; the mover component includes two sets of piece-type permanent magnets respectively symmetrically installed in the two air gaps. The invention can improve the utilization rate of the coil material and is suitable for the application of low space.

Description

Linear compressor driven by moving magnet linear oscillating motor

technical field

The invention relates to a linear compressor, in particular to a linear compressor driven by a moving magnet linear oscillating motor.

Background technique

The linear compressor is driven by a linear oscillating motor, which eliminates the conversion device between rotary drive and reciprocating compression, which greatly improves the efficiency of the compressor. It also has compact structure, light weight, no oil or less lubricating oil, and excellent variable capacity characteristics. advantage. Therefore, from air compressors, vacuum pumps, to small refrigeration devices such as refrigerators and refrigerators, linear compressors are being used more and more widely, and are a major development direction of high-efficiency compressors for small refrigeration devices.

Linear oscillating motors include moving magnet linear oscillating motors and moving coil linear oscillating motors. Among them, the moving magnet linear oscillating motor is a linear oscillating motor in which the permanent magnet material is used as the mover. The constant magnetic field generated by the permanent magnet material and the alternating magnetic field generated by the excitation coil interact to drive the permanent magnet material to do reciprocating and alternating motions. Compared with the moving coil linear oscillation motor using the excitation coil as the mover, the mover has smaller mass, greater thrust and higher efficiency. With the development of new permanent magnet materials, the advantages of moving magnet linear oscillation motors are becoming more and more obvious.

In 1992, Beale and Redlich in the United States developed a moving magnet linear oscillating motor with a Redlich structure. In the late 1990s, Sunpower developed a refrigeration compressor using a cylindrical Redlich linear oscillating motor. In 2003, LGE improved on the basis of this structure and realized the commercialization of linear compressors for the first time. The moving magnet linear oscillating motor of this cylindrical structure installs the magnetic permeable material on the circumference of the exciting coil to form a magnetic circuit structure with a cylindrical air gap concentric with the exciting coil, and the radially magnetized cylindrical permanent magnet Do reciprocating motion in the air gap. The magnetically conductive material is composed of cylindrical inner and outer stators, and the cylinder and piston parts are arranged in the cylinder of the inner stator.

In 2000, Neville and others in New Zealand proposed an oil-free linear compressor using gas bearings. The moving magnet linear oscillating motor used in the linear compressor of this structure is formed by a symmetrically placed stator after stacking two sets of punching plates. Air gap, the permanent magnet moves in the air gap between the two sets of stators. In 2010, Brazil's Embraco announced that it had completed the application and development of the linear compressor with this structure in refrigerators. In 2006, Ye Yunyue of Zhejiang University and others proposed a double-stator linear oscillating motor, the stator of which is made of circular ring-shaped punches. Compared with the cylindrical structure, the motor structure in which the stamping sheets are directly stacked can reduce the difficulty of processing and assembly.

The shape of the existing linear compressor that uses a cylindrical Redlich structure moving magnet linear oscillating motor as a driver is characterized by a better magnetic circuit structure design and a small magnetic circuit loss, but the long diameter is relatively small, and it tends to be short and high. , The assembly of the radial distribution of the outer stator on the circumference is also more difficult. In addition, the motor structure is less difficult to process and assemble, but its magnetic circuit loss is relatively large.

Contents of the invention

(1) Technical problems to be solved

The technical problems to be solved by the present invention are, firstly, how to improve the utilization rate of the coil material; and secondly, how to make the compressor suitable for low space applications.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides a linear compressor driven by a moving magnet linear oscillating motor, including a moving magnet linear oscillating motor, a cylinder, a piston, a suction and exhaust device, and a resonant component; wherein,

The moving magnet linear oscillating motor includes a stator part, a mover part, a first fixed connector, a second fixed connector, and a third fixed connector; the piston is arranged on the mover part; the suction and exhaust device It is arranged at the end of the cylinder; the resonant component is installed between the mover component and the third fixed connection piece;

The stator part includes a first magnetic conductor in the middle with an excitation coil wound around the central column, and two second magnetic conductors located on both sides of the first magnetic conductor; the first magnetic conductor and the second magnetic conductors on both sides Two symmetrical air gaps are formed between the conductors;

The mover component includes two sets of piece-type permanent magnets respectively symmetrically installed in the two air gaps.

Preferably, the mover component further includes a connecting part, and the piece-type permanent magnet is mounted on the connecting part.

Preferably, the first fixed connector is a plate-shaped connector provided with assembly holes; the second fixed connector is a plate-shaped connector provided with assembly holes and slits; the third fixed connector is A connecting piece with assembly holes; the first fixed connecting piece and the second fixed connecting piece are assembled on both sides of the first magnetic conductor and the second magnetic conductor, and are fixedly connected through the first assembly hole group; the third fixed connecting piece is connected to the second fixed connecting piece The two fixed connectors are fixedly assembled through the second assembly hole group; two sets of piece permanent magnets are respectively inserted into the two air gaps of the stator part through the slits on the second fixed connector.

Preferably, the piston is installed in the cylinder, and the two cooperate to realize the positioning of the piece permanent magnet in the air gap and the axial positioning of the mover component.

Preferably, the resonance component is installed between the third fixed connection part and the connection part, and between the second fixed connection part and the connection part.

Preferably, the cylinder is arranged on the third fixed connection member, and the installation direction is the same as that of the piston.

Preferably, the two sets of piece permanent magnets are parallel to each other, and the parallel two sets of piece permanent magnets are respectively assembled at both ends of one side of the connecting part, the other side of the connecting part is connected with the piston, and the piston Insert into the cylinder.

Preferably, the suction and exhaust device is arranged at the end of the cylinder, including an exhaust cavity, a suction cavity, an exhaust valve and a suction valve, and the exhaust cavity and the suction cavity are two independent cavities, so The suction valve and the exhaust valve are arranged in the same direction at the end of the cylinder or at the end of the piston opposite to the exhaust valve.

Preferably, the cylinder is arranged on the second fixed connection member, and the installation direction is opposite to that of the piston.

Preferably, the two sets of piece permanent magnets are parallel to each other, and the parallel two sets of piece permanent magnets are assembled on one side of the connecting part, and the side of the connecting part equipped with the piece permanent magnets is connected to the piston , and the piston is inserted into the cylinder, the suction and exhaust device is arranged between the cylinder and the second fixed connection, including the exhaust chamber, the suction chamber, the exhaust valve and the suction valve, the exhaust chamber and the suction The cavity is two mutually independent cavities, and the suction valve and the exhaust valve are arranged in the same direction at the end of the cylinder or at the end of the piston opposite to the exhaust valve.

(3) Beneficial effects

The magnetic circuit structure of the motor of the present invention is symmetrically distributed (two piece permanent magnets form a symmetrical magnetic circuit with the first magnetic conductor and the second magnetic conductor), and this symmetrical magnetic circuit structure can increase the aspect ratio of the coil The design is to reduce the magnetic circuit loss at the end of the coil, maximize the use of the magnetic field around the coil, and improve the utilization rate of the coil material. Compression components such as cylinders and pistons are arranged on the outside of the motor, making the compressor a slender horizontal structure, which is suitable for some low space applications.

Description of drawings

Fig. 1 is a top view of Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the axial side of Embodiment 1 of the present invention;

Fig. 3 is a top view of Embodiment 2 of the present invention;

Fig. 4 is a schematic axial view of Embodiment 2 of the present invention.

Among them, the first magnetic conductor 1; the excitation coil 2; the second magnetic conductor 3; the air gap 4; the first fixed connection part 5; the second fixed connection part 6; The third fixed connection piece 10; the piston 11; the cylinder 12; the suction and exhaust device 13; the first assembly hole group 14; the second assembly hole group 15;

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Embodiment one

As shown in FIGS. 1 and 2 , this embodiment includes a moving magnet linear oscillating motor, a cylinder 12 , a piston 11 , a suction and exhaust device 13 and a resonant component 9 .

The moving magnet linear oscillating motor includes a stator part, a mover part, a first fixed connection part 5, a second fixed connection part 6, and a third fixed connection part 10; the cylinder 12 is arranged on the third fixed connection part 10 , the installation direction is the same as that of the piston 11; the piston 11 is arranged on the mover part; the suction and exhaust device 13 is arranged at the end of the cylinder 12; the resonant part 9 is installed on the mover part and the third fixed connection Between 10.

The stator component includes a first magnetic conductor 1 in the middle with an excitation coil 2 wound around the central column, and two second magnetic conductors 3 (approximately trapezoidal) placed on both sides of the first magnetic conductor 1 . The longitudinal sections of the two first magnetic conductors 1 are shaped like two "mountain" shapes, and they are symmetrically placed facing each other up and down, and two symmetrical strip-shaped air gaps are formed between the first magnetic conductor 1 and the second magnetic conductors 3 on both sides. 4. The first magnetic conductor 1 and the second magnetic conductor 3 are magnetic conductors formed by stacking silicon steel sheets, or magnetic conductors processed from magnetically permeable materials such as ferrite powder, amorphous nanocrystalline alloy or beryllium molybdenum alloy. conductor.

The mover component includes two piece-type permanent magnets 7 symmetrically installed in the strip-shaped air gaps 4 on both sides and a connecting part 8 for assembling the permanent magnet pieces. Two sets of trapezoidal sheet-type magnetically permeable materials are stacked along the height direction and placed symmetrically on both sides of the first magnetic conductor 1 to form the second magnetic conductor 3 . Two sets of parallel piece permanent magnets 7 are assembled at both ends of one side of the connecting part 8, and the other side of the connecting part 8 is connected with a piston 11 with a smooth outer surface.

The fixed connector includes: a plate-shaped first fixed connector 5 with an assembly hole, a plate-shaped second fixed connector 6 with an assembly hole and a pair of parallel slits, and a third fixed connector with an assembly hole. Connector 10. The first fixed connector 5 and the second fixed connector 6 are assembled on both sides of the first magnetic conductor 1 and the second magnetic conductor 3 , and are fixedly connected through the first assembly hole group 14 . A pair of parallel slits 16 having the same height, width and position as the air gap 4 are provided on the second fixed connecting member 6 . The piece permanent magnets 7 at both ends are respectively inserted into the air gap of the stator part through the slits 16 on the second fixed connector 6, while the piston 11 is inserted into the cylinder 12 on the third fixed connector 10, and the third fixed connector 10 It is fixedly assembled with the second fixed connector 6 through the second assembly hole group 15 . The positioning of the piece permanent magnet 7 in the air gap is realized through the high-smooth precision fit between the piston 11 and the cylinder 12 .

The piston 11 arranged on the mover component is matched and installed in the cylinder 12 to realize the axial positioning of the mover component. The cylinder 12 is arranged on the third fixed connection piece 10 .

The resonant part 9 is installed between the third fixed connection part 10 and the connection part 8 , and between the second fixed connection part 6 and the connection part 8 . The resonating part 9 consists of one or more cylindrical springs or leaf springs.

Suction and exhaust device 13 is arranged on the end of cylinder 12, and comprises parts such as exhaust cavity, suction cavity, exhaust valve and suction valve, and exhaust cavity and suction cavity are two mutually independent cavities, and described The suction valve and the exhaust valve are arranged in the same direction at the end of the cylinder 12 or at the end of the piston 11 opposite to the exhaust valve.

The working principle of the above linear compressor is as follows:

The two piece permanent magnets 7 are symmetrically magnetized in the direction perpendicular to the length direction of the air gap 4, forming a symmetrical magnetic circuit with the first magnetic conductor 1 and the second magnetic conductor 3, and the center column of the first magnetic conductor 1 is wound The excitation coil 2 is connected with alternating current to generate alternating magnetic fields in the positive and negative directions in the long strip air gap 4, and the mover part, together with the resonant part 9, performs reciprocating oscillating motion along the length direction of the air gap 4 under the action of the alternating magnetic field . The piston 11 connected to the mover part reciprocates in the cylinder 12: the piston 11 moves to one side, when the pressure in the cylinder 12 is lower than the suction pressure, the suction valve opens and sucks in the gas, the piston 11 moves in the opposite direction, and the gas is received Compression, when the pressure in the cylinder 12 is greater than the exhaust pressure, the exhaust valve opens and discharges the gas, and so on. This symmetrical magnetic circuit structure can reduce the magnetic circuit loss at the end of the excitation coil by increasing the aspect ratio design of the excitation coil, maximize the use of the magnetic field around the excitation coil, and improve the utilization rate of materials.

Embodiment two

As shown in Figure 2, the structure of the moving magnet linear oscillating motor of this embodiment is the same as the structure of the moving magnet linear oscillating motor of Embodiment 1, the difference is: the connecting part 8 is equipped with two sets of parallel piece permanent magnets One side of 7 links to each other with the smooth piston 11 of outer surface. The cylinder 12 is arranged on the second fixed connecting member 6 , and the installation direction is opposite to that of the piston 11 . The piston 11 is inserted into a cylinder 12 on the second fixed connection 6 . The suction and exhaust device 13 is arranged between the cylinder 12 and the second fixed connecting piece 6 .

The working principle of the second embodiment is the same as that of the first embodiment.

The foregoing is only an embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the technical principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (9)

1. A linear compressor driven by a moving magnet type linear oscillating motor is characterized by comprising the moving magnet type linear oscillating motor, a cylinder (12), a piston (11), an air suction and exhaust device (13) and a resonance component (9); wherein,

the moving magnet type linear oscillation motor comprises a stator component, a rotor component, a first fixed connecting piece (5), a second fixed connecting piece (6) and a third fixed connecting piece (10); the piston (11) is arranged on the rotor component; the air suction and exhaust device (13) is arranged at the end part of the cylinder (12); the resonance part (9) is arranged between the rotor part and the third fixed connecting piece (10);

the stator component comprises a first magnetic conductor (1) which is arranged in the middle and is provided with a central column wound with an excitation coil (2), and two second magnetic conductors (3) which are arranged on two sides of the first magnetic conductor (1); two symmetrical air gaps (4) are formed between the first magnetic conductor (1) and the second magnetic conductors (3) on two sides;

the rotor part comprises two groups of sheet type permanent magnets (7) which are respectively and symmetrically arranged in the two air gaps (4),

the first fixed connecting piece (5) is a plate-shaped connecting piece provided with an assembling hole; the second fixed connecting piece (6) is a plate-shaped connecting piece provided with an assembling hole and a strip seam (16); the third fixed connecting piece (10) is a connecting piece provided with an assembling hole; the first fixed connecting piece (5) and the second fixed connecting piece (6) are assembled at two sides of the first magnetic conductor (1) and the second magnetic conductor (3) and fixedly connected through a first assembling hole group (14); the third fixed connecting piece (10) is fixedly assembled with the second fixed connecting piece (6) through a second assembling hole group (15); two groups of sheet permanent magnets (7) are respectively inserted into two air gaps (4) of the stator component through strip slits (16) on the second fixed connecting piece (6).

2. Linear compressor according to claim 1, characterized in that the mover member further comprises a connecting member (8), the sheet type permanent magnet (7) being mounted on the connecting member (8).

3. Linear compressor according to claim 1, characterized in that the piston (11) is mounted in a cylinder (12) and cooperates with the latter to achieve the positioning of the lamellar permanent magnets (7) in the air gap (4) and the axial positioning of the mover member.

4. Linear compressor according to claim 2, characterized in that the resonant member (9) is mounted between the third fixed connection (10) and the connecting member (8), and between the second fixed connection (6) and the connecting member (8).

5. Linear compressor according to claim 1, characterized in that the cylinder (12) is arranged on the third fixed connection (10) in the same direction as the piston (11).

6. The linear compressor according to claim 2, wherein two sets of the sheet type permanent magnets (7) are parallel to each other, and the two sets of the sheet type permanent magnets (7) which are parallel are respectively assembled at both ends of one side of the connection member (8), the other side of the connection member (8) is connected to the piston (11), and the piston (11) is inserted into the cylinder (12).

7. Linear compressor according to any of claims 1 to 6, characterized in that the suction and exhaust means (13) are arranged at the end of the cylinder (12) and comprise a discharge chamber, a suction chamber, an exhaust valve and a suction valve, the discharge chamber and the suction chamber are two independent chambers, and the suction valve is arranged at the end of the cylinder (12) or at the end of the piston (11) opposite to the exhaust valve in the same direction as the exhaust valve.

8. Linear compressor according to claim 1, characterized in that the cylinder (12) is arranged on the second fixed connection (6) in the opposite direction to the piston (11).

9. The linear compressor according to any one of claims 1 to 4 and 8, wherein two sets of sheet-type permanent magnets (7) are parallel to each other, and the two sets of sheet-type permanent magnets (7) which are parallel to each other are assembled on one side of the connecting member (8), one side of the connecting member (8) on which the sheet-type permanent magnets (7) are assembled is connected with the piston (11), and the piston (11) is inserted into the cylinder (12), the suction and exhaust device (13) is disposed between the cylinder (12) and the second fixed connecting member (6) and comprises an exhaust chamber, a suction chamber, an exhaust valve and a suction valve, the exhaust chamber and the suction chamber are two independent chambers, and the suction valve and the exhaust valve are disposed at the end of the cylinder (12) or at the end of the piston (11) disposed opposite to the exhaust valve in the same direction.