JPH1077976A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability by preventing the wear of the key of an oldham mechanism, a turning scroll for sliding with the key and a slide part with respective key grooves of a frame in a scroll compressor. SOLUTION: In a scroll compressor provided with the oldham ring 10 for rotation preventing of a turning scroll providing a key 10a engaging with a key groove 5c provided on the opposite lap surface side of the turning scroll and a key 10b engaging with a key groove 8a provided on a frame 8, a loading side surface is made non-contact or the surface pressure is reduced by generating a suction force in the opposite side of a load action side between the key grooves 5c, 8a and the keys 10a, 10b of the oldham ring 10 by assembling a magnetic body 19 in the wall surfaces of the key grooves 5c, 8a and the keys 10a, 10b of the oldham ring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll compressor used under severe conditions and used for an air conditioner for a vehicle which requires durability.

[0002]

2. Description of the Related Art In a conventional scroll compressor, oil is supplied to a sliding portion of a frame-side Oldham ring by utilizing a differential pressure or a pump. It has relied solely on splashing oil used for lubricating the slewing bearing from an oil reservoir provided at the bottom of the compressor through an oil supply hole of the main shaft by rotating a balance weight fixed to the rotating main shaft. As for the more positive splashing of oil by the balance weight, as described in JP-A-58-160582, an oil sump is provided at the bottom of the back pressure chamber, and the oil accumulated in the oil sump is balanced. The structure was such that a centrifugal force caused the oil to flow up in the form of a mist due to the oil supply passage provided in the weight. For supplying non-mist oil to the sliding portion of the Oldham key on the frame side, Japanese Patent Laid-Open Publication No. 61-135994 discloses an oil chamber provided on the high pressure side in a closed container, and oil collected in the oil chamber is supplied on the high pressure side. A structure is disclosed in which the pressure is supplied by utilizing a pressure difference between the pressure and the pressure.

Japanese Patent Application Laid-Open No. Sho 61-135994 discloses that an oil chamber is provided on the high pressure side in a closed vessel in order to supply oil to a sliding portion of the Oldham key on the frame side. There is disclosed a structure for supplying by utilizing a difference with the pressure on the side.

[0004]

In the prior art described above, when lubricating oil is splashed by a balance weight during a rotating motion to supply oil to a sliding portion of the Oldham ring, the lubricating oil is supplied to the sliding portion. Was supplied with oil stirred in a mist state. As a result, oil adhering to the inner wall of the frame above the key groove may accumulate in the space defined by the outer peripheral portion of the end plate of the orbiting scroll, the fixed scroll, and the frame, resulting in a shortage of oil supply. Furthermore, when the supply of oil supplied from the oil reservoir provided at the bottom of the compressor to the oil supply hole provided on the main shaft and the slewing bearing is interrupted by utilizing the differential pressure, the oil supply to the sliding portion of the Oldham ring is stopped. This is no longer performed, and there is a problem that the sliding part is worn.

[0005] Further, if the behavior during sliding becomes unstable due to an instantaneous stop, restart, or external vibration due to power interruption during operation, the key of the Oldham ring hits the wall of the keyway. Or the corner of the key hits the wall of the key groove, causing the sliding part to be abnormally worn. If the compressor does not operate due to the malfunction of the sliding portion of the Oldham ring, the air conditioner for railway vehicles driven by the compressor may lose the air conditioning ability and may not be able to continue the operation of the vehicle. Was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable scroll compressor which suppresses abrasion due to unstable behavior during sliding of a rotation preventing mechanism for preventing rotation of a orbiting scroll.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compression mechanism combining a orbiting scroll and a fixed scroll, a frame having a fixed scroll mounted thereon, an Oldham ring for preventing the orbiting scroll from rotating, and driving the orbiting scroll. A driving means having a drive shaft having a drive shaft, wherein at least one of a key and a key groove formed on the Oldham ring and a orbiting scroll and a frame engaged with the Oldham ring, the drive shaft This is achieved by providing a magnetic body that generates a suction force in the direction opposite to the rotation direction of the magnetic head.

By providing the Oldham ring, the orbiting scroll, and the frame with a magnetic material that generates a suction force in a direction opposite to the direction driven by the driving means, the Oldham ring, the orbiting scroll, and the frame, which have conventionally been generated, can be connected to each other. By reducing or eliminating the wear of the contact portion, it is possible to prevent problems caused by the rotation preventing mechanism of the orbiting scroll.

An object of the present invention is to provide a compression mechanism combining an orbiting scroll and a fixed scroll, a frame to which the fixed scroll is attached, rotation preventing means for preventing the orbiting scroll from rotating, and a drive shaft for driving the orbiting scroll. A magnetic body that generates a magnetic force in the opposite direction to the rotation direction of the drive shaft between the anti-rotation means and the frame and the orbiting scroll. Is achieved by

Since the load between the anti-rotation means and the frame and the orbiting scroll is transmitted by the magnetic force, even if the members do not contact or come into contact with each other, the contact pressure is reduced by reducing the surface pressure of the contact portion. Suppresses stable behavior,
The reliability of the compressor can be improved by reducing the wear of the contact portion.

The above object has a compression mechanism combining a orbiting scroll and a fixed scroll, a frame to which the fixed scroll is attached, an Oldham ring for preventing the orbiting scroll from rotating, and a drive shaft for driving the orbiting scroll. In a scroll compressor including a driving unit, a magnetic force in a direction opposite to a rotation direction of the drive shaft is applied to a hook formed between the Oldham ring and the orbiting scroll and frame engaged with the Oldham ring. This is achieved by providing a magnetic material that generates.

[0012] Even if the Oldham ring and the orbiting scroll and the frame do not contact or come into contact with each other, the surface pressure of the contact portion is reduced, the unstable behavior of these members is suppressed, and the wear of the contact portion is reduced. It is possible to reduce the pressure and improve the reliability of the compressor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a longitudinal sectional view showing one embodiment of a scroll compressor according to the present invention, and FIG. 2 is a partial sectional view showing a connection relationship of main parts of the scroll compressor of FIG. FIG. 3 is a partial sectional view showing the structure of keys and key grooves formed on the Oldham ring and the frame of the scroll compressor of FIG. 1, and FIG. 4 is a partial sectional view showing the structure of the keys and key grooves of FIG. It is.

An electric motor unit 3 is accommodated in the lower part of the sealed container 1 and a compressor unit 2 is accommodated in the upper part. The compressor unit 2 forms a compression chamber by meshing the orbiting scroll 5 with the fixed scroll 4. The fixed scroll 4 has a disk-shaped end plate 4a.
A wrap 4b formed in an upright involute curve or a curve similar thereto, and a discharge port 6 for discharging gas compressed in the compression chamber to the outside of the compression chamber at the center thereof.
And a gas inlet 7 on the outer periphery.

On the other hand, the orbiting scroll 5 is also a disk-shaped end plate 5.
A lap 5b is provided upright on a, and a boss 5c is formed on the opposite side of the lap installation surface of the end plate 5a. Frame 8
Has a bearing in the center, and the main shaft 9 is supported by this bearing. One end of the main shaft 9 is located on the motor unit 3 side,
An oil supply pipe 17 is provided at one end, and the other end is rotatably engaged with a boss 5c of the orbiting scroll 5. This boss 5c
Is connected to the motor section 3 of the main shaft 9 and the frame 8.
Are eccentrically arranged with respect to the axis of the bearing portion. An eccentric shaft portion of the main shaft 9 that engages with the orbiting scroll 5 is inserted into a boss 5c of the orbiting scroll 5, and causes the orbiting scroll 5 to perform an orbiting motion.

The fixed scroll 4 is fixed to the frame 8 by bolts. The orbiting scroll 5 and the Oldham ring 10 are provided between the fixed scroll 4 and the frame 8. The orbiting scroll 5 and the frame 8 are each provided with a key groove on a surface facing the Oldham ring 10, and the Oldham ring 10 is formed with a key that fits into each of the key grooves of the orbiting scroll 5 and the frame 8. Have been. The Oldham ring 10 enables the swirling through roll 5 to perform a swiveling motion without rotating.

A suction pipe 11 is connected to the suction port 7 of the fixed scroll 4 and penetrates through the closed vessel 1, and a discharge chamber 12 having the discharge port 6 opened communicates with the lower chamber through a passage. It communicates with a discharge pipe 13 penetrating the closed container 1.

When the orbiting scroll 5 orbits through the eccentric shaft provided at the tip of the main shaft 9 by the electric motor 3, a plurality of compression chambers formed by the orbiting scroll 5 and the fixed scroll 4 move while moving toward the center of the scroll. The volume is reduced, and the refrigerant gas sucked from the suction pipe 11 is compressed. The compressed refrigerant gas is supplied to the end plate 4 a of the fixed scroll 4.
Is discharged from the discharge port 6 into the discharge chamber 12, enters the motor unit 3 through the end plate 4 a of the fixed scroll 4 and the passage formed in the outer peripheral portion of the frame 8, and cools the motor unit 3. It is discharged from.

The back of the orbiting scroll 5 and the frame 8
A pressure intermediate the suction pressure and the discharge pressure acts on a space (back pressure chamber) 14 surrounded by. At this intermediate pressure, a fine hole (back pressure hole) 15 is provided in the end plate 5a of the orbiting scroll 5, and the refrigerant gas during compression inside the scroll is guided to the space, that is, the back pressure chamber through the fine hole 15, and 5
The pressure of the refrigerant gas on the back of the plate. The orbiting scroll 5 is pressed against the fixed scroll 4 by the pressure of the refrigerant gas from the rear surface, so that the compression chambers are kept sealed.

On the other hand, the oil reservoir 16 provided at the bottom of the sealed container 1 is in a state where the discharge pressure is applied.
Due to the pressure difference between the oil and the back pressure chamber 14, oil is supplied to a sliding portion such as a bearing through the oil supply pipe 17 and the oil supply hole 9a. The oil discharged from a sliding portion such as a bearing passes through a back pressure chamber 14 and is splashed by a balance weight 18 to form a mist, and is supplied to the compression chamber from a back pressure hole 15.

The oil supplied to the compression chamber is discharged from the discharge port 6 to the discharge chamber 12 together with the compressed refrigerant gas, and flows to the electric motor unit 3 along the closed casing 1. The oil separated at the coil end 3a of the motor unit 3 flows to an oil reservoir 16 below. On the other hand, the refrigerant gas flows along the inner wall of the closed container 1,
It is discharged from the discharge pipe 13.

The sliding portion of the Oldham ring 10 forming the rotation preventing mechanism is composed of a key 10a fitted in the key groove 5d of the orbiting scroll 5 and a key 10b fitted in the key groove 8a of the frame 8. ing. The keys 10a and 10b of the Oldham ring 10, the key groove 5d of the orbiting scroll 5, and the key groove 8a of the frame 8 have a structure in which linear reciprocation is performed.

Conventionally, oil is supplied to the sliding portion of the Oldham ring 10 from the oil reservoir 16 by an oil pressure hole 9a of the main shaft 9 by a differential pressure.
The oil supplied to the slewing bearing via the slewing bearing is used to splash the oil that has fallen from the slewing bearing onto the balance weight 18.

The scroll compressor of this embodiment has a keyway 8a formed in the frame 8 and a wall facing the keyway 5d of the orbiting scroll 5 and a key 10a protruding toward the orbiting scroll of the Oldham ring 10 and the frame. The magnetic body 19 made of a permanent magnet is incorporated in the protruding key 10b. That is, between the key grooves 8a and 5d and the keys 10a and 10b, the magnetic body 19 is installed on the side opposite to the surface transmitting the force in the rotation direction of the main shaft 9 so that the different poles face each other. . Therefore, the keyway 8a and the keyway 5d and the key 10a
And the magnetic body 19 installed on the key 10b generate a suction force, and the suction force transmits a force in the rotational direction between the Oldham ring 10, the orbiting scroll 5, and the frame 8, so that the main shaft rotates. The surface transmitting the directional force can be non-contact or the contact surface pressure can be significantly reduced.

A suction force 20 is generated between the key groove 8a and the key 10b on the frame side and the key groove 5d on the orbiting scroll side and the key 10a, which have conventionally been slid via the lubricating oil, so that the main shaft 9 is rotated. The difference is that the contact surface transmitting the load 21 acting in the rotational direction is completely non-contact. The suction force 2
0, that is, a magnetic force is applied between the Oldham ring 10 and the orbiting scroll 5 and the frame 8 so that the load transmission between each key and the key groove between the Oldham ring 10 and the orbiting scroll 5 and the frame 8 is made non-contact. Can be done with Therefore, it is possible to prevent hitting between the key and the key groove due to unstable behavior between the Oldham ring 10 and the orbiting scroll 5 and the frame 8 during operation, or abnormal wear due to an increase in surface pressure.

The suction force 20 is applied to the orbiting scroll 5
To reduce the contact surface pressure between the keyway 8a and the key 10b and between the keyway 5d and the key 10a, thereby reducing the contact pressure between the Oldham ring 10 and the orbiting scroll 5 and the frame 8 during operation. The structure which prevents abnormal wear due to beating or unstable contact due to an increase in contact surface pressure may be employed.

FIGS. 3 and 4 are enlarged sectional views showing the keyway 8a on the frame side shown in FIGS. 1 and 2. FIG. In these figures, when the orbiting scroll 5 orbits, the magnetic body 19 is incorporated in the wall surface 8b of the key groove 8a corresponding to the non-load side of the load 21 from the key 10b of the Oldham ring 10, and the N pole of the magnetic body 19 By arranging the 19a and the S pole 19b such that the different poles face each other, a suction force 20 is generated. The magnetic body 19 is formed by forming a groove on the wall surface 8b of the key groove 8a and the wall surface of the key 10b over substantially the entire length of the key groove and the key in the longitudinal direction, and is fitted into the groove.

Attraction force 2 generated between opposed magnetic bodies 19
If 0 is larger than the load 21 acting in the rotation direction of the main shaft 9, the key 10 b transmitting the load 21 does not contact the wall surface 8 b ′ of the key groove 8 a and the load 21 is applied by the attraction force 20 of the magnetic body 19. Will support. At this time, the key 10b comes into contact with the wall surface 8b on the opposite side of the wall surface 8b 'of the key groove 8a. The contact surface pressure between the key 10b and the wall surface 8b is obtained by subtracting the load 21 from the suction force 20. Therefore, by selecting the suction force 20 to be slightly higher than the maximum load, abnormal wear of the wall surface 8b can be prevented.

If the suction force of the magnetic material is greater than the load in the main shaft rotation direction during normal operation, and if the suction force is at least twice as large as the load during normal operation, the load decreases. In this case, the contact force between the key 10b and the wall surface 8b of the key groove 8a increases due to the suction force, so that the suction force needs to be set to be smaller than twice the load.

If the magnitude of the suction force 20 is smaller than the load 21, the key 10b comes into contact with the wall surface 8b ', but the surface pressure acting on this contact portion has conventionally occurred on the wall surface 8b'. Since the pressure is lower than the surface pressure, wear can be reduced. Further, since the key 10b is constantly attracted to the key groove wall surface 8b on the side opposite to the load 21 by the suction force 20, the key 10b
Can be prevented from hitting the keyway wall surface 8b '.

When the suction force 20 exceeds the load 20, the different poles of the magnetic body 19 come into contact with each other. Therefore, when the wear resistance of the material of the magnetic body 19 itself is low, the attraction force 20 of the magnetic body 19 is reduced by installing the protective film 22 having excellent wear resistance on the surface of the magnetic body 19. The magnetic body 19 can be protected without causing the magnetic material 19 to be damaged.

If the magnitude of the suction force 20 is smaller than the load 21, the key 10b is moved to the keyway wall 8 in the load direction.
In this case, the suction force 20 acts in the direction opposite to the load 21 of the load 21.
The frictional force generated on the key groove wall surface 8b 'can be reduced by the size of. Further, since the suction force 20 acts in the opposite direction to the load 21, the key 10 may be disturbed during operation.
b can buffer the operation of hitting the keyway wall surface 8b ', thereby preventing abnormal wear.

However, each key of the Oldham ring has a width in the radial direction and a circumferential direction of 8 mm and a height of 4.5 m.
m, and the keyway of the orbiting scroll and the keyway of the frame have a width of about 8 mm + α, a length of about 20 mm, and a depth of about 4.5 mm + α. The task of assembling with high precision is expected to be quite difficult.

An embodiment which solves such a problem is shown in FIGS. In the figure, a through hole 51 for incorporating the magnetic body 19 into the keyway 8a on the frame side is opened from the outside 8c of the keyway 8a, and the magnetic body 19 is assembled therefrom, thereby facilitating the manufacture. it can. The key 10b of the Oldham ring 10 is also provided with a through-hole 52, and the magnetic body 19 is incorporated therein, thereby facilitating the manufacture.

According to such a configuration, the magnetic body is installed on the wall surface of the key groove by forming a through hole from a portion opposite to the wall surface and inserting and fixing the magnetic body 19. Therefore, the machining operation can be easily performed, and the improvement of the machining accuracy can be sufficiently ensured. The installation positions of the magnetic body on the frame 8 side and the magnetic body on the Oldham ring 10 side are determined as positions that do not shift in the axial direction.
It is configured such that unnecessary axial force is not generated.

Since the size of the attraction force 20 is determined by the area of the magnetic body 19 facing the magnetic material 19, it is expected that if the area is small, the attraction force 20 is reduced and the effect is reduced.
Therefore, an embodiment in which the area is increased and the suction force 20 is increased is shown in FIGS. In the figure, the wall surface 8b of the keyway 8a on the frame side is cut off, and the magnetic body 19 is embedded therein. Also, the frame side key 1 of the Oldham ring 10
Ob is deleted, a groove 53 is machined in the portion, and a magnetic body 19 ′ that fits the key groove 8 a and the groove 53 of the Oldham ring 10 is incorporated. The magnetic body 19 'is provided on the frame-side key 10 of the Oldham ring 10 which is conventionally installed within a range that does not hinder sliding.
By making it larger than b, the area facing the frame-side magnetic body 19 can be increased, so that the suction force can be increased.

According to the present invention, a magnetic material such as a permanent magnet is incorporated on the opposite side of a portion which has been conventionally pressed and slid by a load to generate an attraction force, and a non-magnetic force is applied to the load direction. Even if each member is instructed by contact or the surface pressure between each member can be reduced even if they come into contact, an excessive load is applied to the Oldham ring due to a decrease in oil supply, a decrease in oil viscosity, mixing of liquid refrigerant, external vibration, etc. Wear can be prevented or reduced under any conditions such as when the behavior becomes unstable due to the addition.

In each of the above embodiments, between the Oldham ring and the orbiting scroll and the frame, the rotational force (the load 21) of the orbiting scroll is transmitted or partially borne by the attraction force of the magnetic material. But below,
In the embodiment shown in FIG. 9, the rotation of the orbiting scroll is suppressed by a combination of not only the attraction force of the magnetic material but also the repulsion force. In FIG. 9, the same reference numerals as those of the above-described embodiment denote the same members. A key 40 made of a magnetic material is installed in a groove 53 of the Oldham ring 10, and magnetic bodies 39 are installed on both wall surfaces of a key groove 38 of the frame 8 into which the key 40 is fitted. One wall portion 40a of the key 40 has an N pole, and the other wall surface 40b has an S pole. The keyway 3 facing the wall portion 40a
8 has an S pole, and the wall surface 39b facing the wall surface 40b also has an S pole. Therefore, a suction force transmitting the load 21 acts between the wall surface 40a of the key 40 and the wall surface 39a of the key groove 38. Also, the wall portion 40b of the key 40 and the key groove 38
A repulsive force for transmitting the load 21 acts between the first and second wall portions 39b. As described above, the magnetic member 39 having the same polarity is provided in the key groove 38, and the same pole as the magnetic member 39 is disposed on the wall surface in the direction in which the load 21 acts as viewed from the key 40. A pole different from that of the magnetic body 39 is arranged in the portion. With the combination of the key 40 and the magnetic body 39, the load 21 can be transmitted by magnetic force of suction and repulsion. Therefore, the key 40 and the keyway 38
The load 21 can be transmitted in a state in which the surface pressure of the contact portion is reduced as compared with the related art even when the contact 21 is not in contact or in contact.

According to such a configuration, the key 40 and the key groove 3 are formed between the key 40 of the Oldham ring 10 and the key groove 38 of the frame 8 by a combination of a magnetic force of suction and repulsion.
The load 21 can be transmitted by eliminating the contact with the contact 8 or by reducing the surface pressure even if the contact is made. The relationship between the key 40 and the key groove 38 is similarly applied to the key and the key groove included in the Oldham ring 10 and the orbiting scroll 5. Therefore, the compressor provided with the present structure is capable of rotating the orbiting scroll 5 between the Oldham ring 10 and the orbiting scroll 5 and the frame 8 in a state where the surface pressure is reduced even when the compressor is not in contact with or in contact with the frame. Can be prevented. Since the transmission of the load 21 can be performed in a state where the key and the key groove are not in contact with each other or in a state where the surface pressure is reduced, unstable behavior and abnormal wear caused by the conventional behavior can be prevented.

[0040]

According to the present invention, the anti-rotation mechanism of the orbiting scroll is constituted by using a magnetic body,
What has held the orbiting scroll by the sliding portion can be configured to reduce the non-contact or contact surface pressure by using magnetic force. Thus, the wear of the conventional sliding portion can be prevented or reduced. Therefore, the reliability of the scroll compressor can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall structure of one embodiment of a scroll compressor according to the present invention.

FIG. 2 is a partial cross-sectional view showing a connection relationship of main parts of the embodiment shown in FIG.

FIG. 3 is a partially enlarged sectional view of a frame-side keyway portion of the embodiment shown in FIG. 2;

FIG. 4 is an enlarged sectional view of a portion incorporating the magnetic body of the embodiment shown in FIG.

FIG. 5 is a partially enlarged cross-sectional view of a frame-side keyway portion according to another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a portion incorporating the magnetic body of the embodiment shown in FIG.

FIG. 7 is a partially enlarged cross-sectional view of a frame-side keyway portion according to another embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a part incorporating the magnetic body of the embodiment shown in FIG. 7;

FIG. 9 is a partially enlarged sectional view of a frame-side keyway according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Compressor part, 3 ... Electric motor part, 4 ... Fixed scroll, 5 ... Orbiting scroll, 5d ... Orbiting scroll keyway, 8 ... Frame, 8a ... Frame keyway, 8
b, 8b '... frame key groove wall surface, 8c ... outside of the frame key groove, 9 ... spindle, 9a ... oil supply hole, 10 ... Oldham ring, 10a, 10b ... Oldham ring key, 16 ... compressor bottom oil sump, 18 ... Balance weight, 19, 19 '
... magnetic material, 19a ... N pole, 19b ... S pole, 20 ... suction force, 21 ... load, 51, 52 ... through hole, 53 ... groove.

Claims (5)

[Claims] A drive mechanism having a compression mechanism combining a orbiting scroll and a fixed scroll, a frame having the fixed scroll attached thereto, an Oldham ring for preventing the orbiting scroll from rotating, and a drive shaft for driving the orbiting scroll. And a key and a key groove formed in the Oldham ring and the orbiting scroll and the frame engaged with the Oldham ring, and a suction force in a direction opposite to a rotation direction of the drive shaft. A scroll compressor comprising a magnetic material that generates noise. 2. A scroll compressor according to claim 1, wherein said magnetic body is a permanent magnet, and is arranged with a different pole facing a portion of said key and said key groove facing each other. Compressor. 3. A drive having a compression mechanism combining a orbiting scroll and a fixed scroll, a frame to which the fixed scroll is attached, rotation preventing means for preventing the orbiting scroll from rotating, and a drive shaft for driving the orbiting scroll. And a magnetic body that generates a magnetic force in a direction opposite to the rotation direction of the drive shaft between the anti-rotation means and the frame and the orbiting scroll. And scroll compressor. 4. A driving mechanism having a compression mechanism combining a orbiting scroll and a fixed scroll, a frame to which the fixed scroll is attached, an Oldham ring for preventing the orbiting scroll from rotating, and a drive shaft for driving the orbiting scroll. Wherein a magnetic force in a direction opposite to the rotational direction of the drive shaft is generated in a hook formed between the Oldham ring and the orbiting scroll and frame engaged with the Oldham ring. A scroll compressor characterized by installing a magnetic material. 5. A scroll compressor according to claim 4, wherein said engaging portion is constituted by a key and a key groove, and a repulsive magnetic material is provided on an opposite portion of said engaging portion in the rotation direction of said drive shaft. A scroll compressor, wherein a suction-type magnetic material is provided at a portion facing the engaging portion in a direction opposite to the rotation of the drive shaft.