JPH11107920A - Reciprocating type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating type compressor formed such that many magnets provided in a rotor rotated at a high speed by mutual action with a stator, while always maintaining an equal space, are separated from each other. SOLUTION: A reciprocating type compressor comprises a stator winding a coil to form an electric field, core 221 formed by many steel plates layered in an axial direction, many magnets 222 provided in a peripheral surface of the core, protecting can 223 covering an outer side surface of the magnet, and a rotor 220 rotated by mutual action with the stator, so as to mutually separate many of the magnets while always maintaining an equal space, and a separating member 222a of non-magnetic material is inserted to be closely mounted in the magnet between the magnets. In a peripheral surface of the core, a protrusion of quantity equal to the magnet is provided to protrude in a radial direction, the magnet is arranged between each protrusion, and the isolating member is inserted between an outer side surface of the protrusion and an inner side surface of the protecting can. The isolating member is formed in bar shape, and consists of aluminum material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor, and more particularly, to a plurality of magnets provided on a high-speed rotating rotor which interacts with a stator and is always spaced apart from each other while maintaining the same spacing. To a reciprocating compressor.

[0002]

2. Description of the Related Art Generally, a reciprocating compressor is used for compressing a refrigerant to a high temperature and a high pressure in a refrigeration cycle in which a compression, condensation, expansion, and evaporation process is continuously performed using the refrigerant as a working fluid. As shown in FIG. 1, the conventional reciprocating compressor having such a function includes a driving unit 20 for generating power inside the closed casing 10 and a power transmitted from the driving unit 20 to generate a refrigerant. After being sucked and compressed, it is composed of a compression unit 30 for discharging to the outside. The driving unit 20 includes a stator 21 in which a coil is wound to form an electric field, a rotor 22 that rotates by interacting with the stator 21, and is press-fitted into the rotor 22 to rotate together, and is eccentric to a lower end thereof. Axis 24
The rotary shaft 23 is provided with a rotary shaft.

The rotor 22 is provided on a core 22a formed by laminating a number of steel plates and is spaced apart from each other on the outer peripheral surface of the core 22a at the same interval, and interacts with an electric field formed by the stator 21. Many magnets 22b and rotor 2
2 is provided with a protective can 22c for covering the cover 2.
The protection can 22 c is made of a non-magnetic material, and is formed in a cylindrical shape with upper and lower portions opened. Upper and lower cover plates 22 d and 22 e are coupled to upper and lower portions of the rotor 22. The upper and lower cover plates 22d and 22e are disk-shaped, and are fastened to the upper and lower surfaces of the rotor 22 using rivets 22f so that the inner side surfaces of the cover plates 22d and 22e are made of the core 22a and the magnet 22a.
The upper and lower surfaces of the magnet b are in close contact with each other, and the movement of the magnet 22b is suppressed.

On the other hand, the compression section 30 has a cylinder 31 provided therein with a compression chamber 32 for sucking and compressing the refrigerant, a piston 34 reciprocating in the compression chamber 32, and a connection for connecting the piston 34 and the eccentric shaft 24. It is composed of a rod 33.
In the reciprocating compressor configured as described above, when the power is applied, the rotor 22 interacts with the electric field formed by the stator 21 and rotates at a high speed, so that the rotating shaft 23 also rotates. become. And the rotating shaft 23
Is rotated by the eccentric shaft 24 provided at the lower end and the connecting rod 3.
3, the piston 34 is converted into a linear reciprocating motion, and the piston 34 reciprocates inside the compression chamber 32. Thus, the process of sucking the refrigerant into the compression chamber 32, compressing the refrigerant to a high temperature and a high pressure, and then discharging the refrigerant to the outside is repeatedly performed.

However, in such a conventional reciprocating compressor, if the inner surfaces of the upper and lower cover plates connected to the upper and lower portions of the rotor are not in close contact with the upper and lower surfaces of the magnet, the magnet moves freely during rotation. There was a problem. That is, if the cover plate is deformed during the assembling process, or if the upper surface of the magnet is assembled lower than the upper surface of the core, the magnet is not fixed by the cover plate and the magnet moves. As described above, if the magnet moves during the rotation of the rotor, noise is generated, the distance between the magnets becomes uneven, the magnetic field balance is broken, and the rotor cannot rotate at a uniform speed. Therefore, there is a problem that the efficiency of the compressor is reduced.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above-mentioned problems, and its object is to provide a large number of magnets provided in a rotor that rotates at high speed by interacting with a stator. An object of the present invention is to provide a reciprocating compressor which is always separated from each other while maintaining the same interval.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object of the present invention, the present invention provides a stator in which a coil is wound to form an electric field, and a core in which a number of steel sheets are laminated in an axial direction. A reciprocating compressor comprising: a plurality of magnets provided on an outer peripheral surface of the core; and a rotor having a protective can for covering an outer surface of the magnet and rotating by interacting with the stator. A separating member made of a non-magnetic material is inserted between the magnets in close contact with the magnets so that the magnets are always separated from each other while maintaining the same spacing.

The same number of protrusions as the magnets are provided on the outer peripheral surface of the core in the radial direction, and the magnets are arranged between the respective protrusions. The separation member is inserted between the side member and the side surface. The separation member is formed in a rod shape and is made of an aluminum material.

[0009]

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a sectional view showing the structure of the reciprocating compressor according to the present invention, and FIG.
1 is a perspective view showing a rotor of a reciprocating compressor according to the present invention. As shown in FIG. 2, the reciprocating compressor according to the present invention is configured such that an upper container 110 and a lower container 120 are hermetically coupled to each other to form a closed container 100, and the inside of the closed container 100 generates power. The driving unit 200 includes a driving unit 200 and a compression unit 300 that receives power transmitted from the driving unit 200, sucks and compresses the refrigerant, and then discharges the refrigerant.

The driving unit 200 is provided on the upper side of the inside of the sealed container 100 and has a stator 210 wound with a coil to form an electric field; a rotor 220 which rotates by interacting with the stator 210; The rotary shaft 2 having the eccentric shaft 240 provided at the lower end thereof.
30. The rotor 220 includes a core 221 formed by stacking a large number of steel plates in an axial direction, and a plurality of magnets provided at equal intervals on an outer peripheral surface of the core 221 and interacting with an electric field formed by the stator 210. 222
And the magnet 222 due to the centrifugal force when the rotor 220 rotates at high speed.
The protective can 223 is configured to cover the outer surface of the magnet 222 in order to prevent the magnet 222 from being detached. The protection can 223 is made of a non-magnetic material, and is formed in a cylindrical shape having upper and lower portions opened. Upper and lower cover plates 224 and 225 are coupled to upper and lower portions of the rotor 220.

On the other hand, as a characteristic element of the present invention, the same number of projections 221a as the number of the magnets 222 protrude from the outer peripheral surface of the core 221 in the radial direction, and the magnets 222 are arranged between the respective projections 221a. Are separated from each other by the same distance. A rod-shaped separating member 222a made of a non-magnetic material having the same diameter and length is closely attached to the magnet 222, the projection 221a, and the protection can 223 between the outer surface of the protrusion 221a and the inner surface of the protection can 223. To prevent the magnet 222 from floating. This is because a uniform magnetic field is formed by maintaining a uniform separation distance between the magnets 222 so that the rotor rotates at a uniform speed. Preferably, the separating member 2
22a is formed of an aluminum material.

The assembling process of the rotor 220 constructed as described above will be described as follows. First, after arranging a large number of magnets 222 between the protrusions 221 a on the outer peripheral surface of the core 221, the magnet 2 is placed with the protective can 223 inserted therein.
When the separating member 222a is inserted between the magnets 222 so as to be in close contact with the magnets 222, the plurality of magnets 222 do not move even during the high-speed rotation of the rotor 220, and are separated from each other while always maintaining the same spacing. Become like

On the other hand, the upper and lower cover plates 224 and 225 that cover the upper and lower portions of the rotor 220 are connected by using rivets 226. After inserting the separation member 222a, the upper and lower cover plates 224 and 225 are connected to the rotor 220 by the rotor 220. The rivet 226 is inserted so as to penetrate the upper and lower cover plates 224 and 225 and the core 221 in a state where the upper and lower surfaces of the rivet 226 are aligned with each other. The upper and lower portions of the rotor 220 are closed, and the core 221 and the magnet 222 are in close contact with the upper and lower surfaces. Reference numeral 227 denotes an equilibrium member attached to a lower portion of the rotor 220, which compensates for an eccentric mass generated by the eccentric shaft 240.

The compression unit 300 is connected to the closed container 10.
0, a cylinder 310 provided with a compression chamber 320 in which the refrigerant is sucked, compressed and discharged after being compressed, and a piston 340 reciprocating in the compression chamber 320
And a connecting rod 330 connecting the piston 340 and the eccentric shaft 240. In addition, the sealed container 100
Oil is stored at the bottom of the eccentric shaft 240, and an oil pickup device 400 that supplies the oil to the drive unit 200 and the compression unit 300 is provided at one end of the eccentric shaft 240.

The operation of the reciprocating compressor constructed as described above according to the present invention will be described as follows. When an external power is input to the stator 210 on which the coil is wound, an electric field is formed, and the magnet 222 of the rotor 220 rotates by interacting with the electric field, so that the rotating shaft 230 to which the eccentric shaft 240 is attached also rotates. It comes to rotate. Therefore, the rotation of the eccentric shaft 240 is converted into a linear reciprocating motion by the connecting rod 330 connecting the eccentric shaft 240 and the piston 340, and the refrigerant is sucked into the compression chamber 320 by the piston 340 reciprocating in the compression chamber 320. After being compressed to a high pressure, it is discharged to the outside. At the same time, the oil pickup device 400 installed at one end of the eccentric shaft 240 that rotates eccentrically rotates, whereby oil is
00 and supplied to the compression unit 300 to perform cooling and lubrication.

The rotation of the rotary shaft 230 is controlled by the core 2
This is performed by a number of magnets 222 which are coupled to the outside of the magnet 21 and form a magnetic field so as to interact with an electric field, and a rod-shaped separating member made of a non-magnetic material having the same diameter and length is provided between the magnets 222. Since the 222 a is inserted so as to be in close contact with the magnet 222, the magnet 222 does not move even during the high-speed rotation of the rotor 220.

[0017]

As described above, the reciprocating compressor according to the present invention inserts a rod-shaped separating member between a number of magnets in the axial direction so as to be in intimate contact with the magnets. There is an advantage that the reliability of the reciprocating compressor is improved because a large number of magnets do not move during rotation and are always separated from each other while maintaining the same interval.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a conventional reciprocating compressor.

FIG. 2 is a sectional view showing the structure of a reciprocating compressor according to the present invention.

FIG. 3 is a perspective view showing a rotor of the reciprocating compressor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Closed container 210 Stator 220 Rotor 221 Core 221a Projection 222 Magnet 222a Separation member 223 Protective can 230 Rotating shaft 240 Eccentric shaft 310 Cylinder 320 Compression chamber 330 Connecting rod 340 Piston

Claims (3)

[Claims] 1. A stator in which a coil is wound to form an electric field, a core in which a number of steel plates are laminated in an axial direction, a number of magnets provided on an outer peripheral surface of the core, and an outer surface of the magnet. A reciprocating compressor comprising a rotor that interacts with the stator and has a rotor that rotates while interacting with the stator, wherein the plurality of magnets are separated from each other while always maintaining the same interval. A reciprocating compressor, wherein a separating member made of a material is inserted between the magnets in close contact with the magnets. 2. The same number of protrusions as the magnets are projected on an outer peripheral surface of the core in a radial direction, the magnets are arranged between the respective protrusions, and an outer surface of the protrusion and an inner surface of the protective can. The reciprocating compressor according to claim 1, wherein the separation member is inserted between the side member and the side surface. 3. The reciprocating compressor according to claim 2, wherein the separating member is formed in a rod shape and is made of an aluminum material.