JPH09317664A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by preventing abrasion of a sliding part of a key of an Oldham's ring provided for prevention of autorotation of a revolving scrollin a scroll compressor and a key groove of the revolving scroll sliding with this key and a key groove of a frame. SOLUTION: This compressor is constituted by being furnished with an Oldham's ring 10 for prevention of autorotation of a revolving scroll furnished with a key 10a to be engaged with a key groove provided on a reverse lapped surface side of the revolving scroll and a key 10b to be engaged with a key groove 8a provided on a frame 8. Magnetic bodies 19 are built in wall surfaces of the key grooves 5c, 8a and the keys 10a, 10b of the Oldham's ring 10, and the aforementioned members are held in non-contact between them by generating resiliency between the key grooves 5c, 8a and the keys 10a and 10b of the Oldham's 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 suitable for use in a vehicle air conditioner which is used under severe conditions and requires durability.

[0002]

2. Description of the Related Art In a conventional scroll compressor, oil is supplied to a sliding portion of an Oldham ring on the frame side by using a differential pressure or a pump or the like. It depends only on splashing the oil used for lubrication of the slewing bearing from the oil reservoir provided on the bottom of the compressor through the oil supply hole of the main shaft by the rotation of the balance weight fixed to the rotating main shaft. Further, as for more positively splashing oil with a balance weight, as described in JP-A-58-160582, an oil reservoir is provided at the bottom of the back pressure chamber, and the oil accumulated in this oil reservoir is balanced. Due to the oil supply passage provided in the weight, the structure was such that it was repelled into a mist by centrifugal force. 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]

SUMMARY OF THE INVENTION In the above prior art,
When oil is being supplied to the sliding part of the Oldham ring by the splashing motion of the balance weight during the rotary motion,
Mist-like agitated oil was supplied to the sliding portion. 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, if the supply of oil that passes through the oil reservoir provided in the bottom of the compressor and the oil supply hole provided in the main shaft and the slewing bearing is interrupted by utilizing the differential pressure, the oil supply to the Oldham ring sliding part will be reduced. There has been a problem that the sliding portion is worn out because of no longer being performed.

An object of the present invention is to provide a highly reliable scroll compressor which suppresses wear of a rotation preventing mechanism for preventing rotation of an orbiting scroll.

[0006]

SUMMARY OF THE INVENTION The above object is to provide a scroll compression system comprising a compression mechanism in which an orbiting scroll and a fixed scroll are combined, a frame to which the fixed scroll is attached, and an Oldham ring for preventing the orbiting scroll from rotating. In the machine, it is achieved by installing a magnetic body that generates a repulsive force in the rotational direction in the key and the key groove formed in the Oldham ring and the orbiting scroll and the frame that engage with the Oldham ring. .

[0007]

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. 3 is a partial sectional view showing a structure of a key and a key groove formed on an Oldham ring and a frame of the scroll compressor of FIG. 1, and FIG. 4 is a sectional view showing a detailed structure of the key and the key groove of FIG. Is.

An electric motor part 3 is housed in the lower part of the closed container 1, and a compressor part 2 is housed 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.
An upright wrap 5b is provided on a, and a boss 5c is formed on the side opposite to the lap installation surface of the end plate. The frame 8 has a bearing portion formed in the center thereof, and the main shaft 9 is supported by the bearing portion. One end of the main shaft 9 is located on the electric motor 3 side, the end is provided with an oil supply pipe 17, and the other end is rotatably engaged with the boss 5c of the orbiting scroll 5. The coupling portion with the boss 5c is arranged eccentrically with respect to the shaft center of the motor portion 3 of the main shaft 9 and the bearing portion of the frame 8. The eccentric shaft portion of the main shaft 9 that engages with the orbiting scroll 5 is inserted into the boss 5c of the orbiting scroll 5, and causes the orbiting scroll 5 to perform the orbiting motion.

The fixed scroll 4 is fixed to the frame 8 by bolts. A turning scroll 5 and an Oldham ring 10 are installed between the fixed scroll 4 and the frame 8. Each of the swivel scroll 5 and the frame 8 is formed with a key groove on the surface facing the Oldham ring 10, and the Oldham ring 10 is fitted into each key groove of the swivel scroll 5 and the frame 8. The key to do is formed. The Oldham ring 10 allows the turning scroll 5 to perform a turning motion without rotating.

The fixed scroll 4 has a suction port 7 penetrating the closed container 1, a suction pipe 11 connected thereto, and a discharge chamber 12 in which a discharge port 6 is open. The discharge chamber 12 communicates with a lower chamber through a passage. It communicates with a discharge pipe 13 that penetrates the closed container 1.

When the orbiting scroll 5 orbits by the electric motor unit 3 via the eccentric shaft provided at the tip of the main shaft 9, a plurality of compression chambers formed by the orbiting scroll 5 and the fixed scroll 4 move 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 rear surface 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. By pressing the orbiting scroll 5 against the fixed scroll 4 by the pressure of the refrigerant gas from the back surface, the compression chambers are kept sealed.

On the other hand, the oil sump 16 provided at the bottom of the closed container 1 is in a state where the discharge pressure acts, and the oil sump 16
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 into the discharge chamber 12 together with the compressed refrigerant gas, and flows to the electric motor section 3 along the closed container 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 into the key groove 5d of the orbiting scroll 5 and a key 10b fitted into 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 revolving scroll 5 and the key groove 8a of the frame 8 are structured to perform a linear reciprocating motion.

Conventionally, oil is supplied to the sliding portion of the Oldham ring 10 by means of a differential pressure from the oil reservoir 16 to the oil supply hole 9a of the main shaft 9.
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.

In the scroll compressor of this embodiment, the key groove 8a formed in the frame 8 and the wall surface of the orbiting scroll 5 facing the key groove 5d and the key 10a protruding toward the orbiting scroll side of the Oldham ring 10 and the frame side. It has a configuration in which a magnetic body 19 made of a permanent magnet is incorporated in the protruding key 10b. That is, between the key groove 8a and the key groove 5d and the key 10a and the key 10b, the magnetic bodies 19 are installed so that the same poles face each other on the surface transmitting the force in the rotational direction. Therefore, the key groove 8a and the key groove 5d, and the key 10a and the key 10b.
The magnetic bodies 19 installed in and generate repulsive forces with each other,
Due to this repulsive force, the force in the rotational direction of the Oldham ring 10, the turning scroll 5 and the frame 8 is transmitted in a non-contact manner. Conventionally, the repulsive force 2 is generated between the key groove 8a and the key 10b on the frame side and the key groove 5d and the key 10a on the orbiting scroll side, which are conventionally slid through the lubricating oil.
Not only does it generate zero to make it completely non-contact, but also the key groove 8a and the key 10b and the key groove 5d and the key 10a.
It may be a structure for reducing the surface pressure of.

FIGS. 3 and 4 are enlarged sectional views showing a portion of the key groove 8a on the frame side shown in FIGS. In these figures, a magnetic body 19 is incorporated in a wall surface 8b of a key groove 8a which receives a load 21 from a key 10b of the Oldham ring 10 when the orbiting scroll 5 orbits, and the magnetic body 19 has an N pole 19a and an S pole 19b.
A repulsive force 20 is generated by arranging b so that the same poles face each other. The magnetic body 19 forms 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 in the longitudinal direction of the key,
It is installed by being fitted in the groove.

Repulsive force 2 generated between opposed magnetic bodies 19
When the magnitude of 0 is larger than the total of the repulsive forces 20 'on the side opposite to the weight 21, the key 10b and the wall surface 8b do not contact each other. The repulsive force 20 is the key 1 of the Oldham ring 10.
0b and the wall surface 8b are in inverse proportion to each other, and the closer the distance is, the larger the key 10b is.
When approaching, the repulsive force 20 'on the opposite side becomes large and the key 10b and the wall surface 8b' do not contact each other.

When the magnetic body 19 is installed, the magnetic body 19 is arranged on the wall surface 8b of the key groove 8a vertically or axially in two steps, and the magnetic body 19 is arranged on the wall surface of the key 10b. The magnetic body 19 may be arranged so as to be located between the magnetic bodies 19. With such an arrangement, it is possible to eliminate the axial force generated between the opposed magnetic bodies.

Regarding the structure for incorporating the magnetic body, there is also a method of dividing and incorporating as shown in FIG. 5 as another embodiment of the present invention. That is, the cylindrical magnetic body 19 is attached to the key groove 8
It has a structure in which it is installed by being inserted into a hole easily machined with a drill from the side opposite to the wall surface 8b of a. According to this structure, the structure of the portion on which the magnetic body 19 is installed is only a hole drilling with a relatively simple drill, and workability can be improved.

As another embodiment of the present invention, a structure is conceivable in which a rail fitted to the key portion is constructed and a magnetic material is installed on the key and the rail. As shown in FIG. 6, a rail 22 is provided so as to project in the central portion of the key groove 8 a of the frame 8, and the key 10 b of the Oldham ring 10 straddles the rail 22. In the case of this structure, it can be considered that the magnetic body 19 is provided inside the rail 22 and on both sides of the key 10b straddling the rail 22. The rail 22
Is fitted and installed in a groove formed in advance on the bottom surface of the key groove 8a. According to this structure, the magnetic member 19 is installed on the key 10b and the rail 22 of the Oldham ring 10.
That is, it is processing on the protruding portion or the surface of a single component, and the work can be easily performed.

However, each key of the Oldham ring has a width of 8 mm in the radial direction and a width of 4.5 mm in the circumferential direction, and the keyway of the orbiting scroll and the keyway of the frame have a width of 8 mm + α and a length of 20 mm. To 30 mm, depth 4.
It is expected that it will be quite difficult to incorporate the magnetic material with high accuracy, because the material to be machined is as small as about 5 mm + α.

An embodiment in which such a problem is solved is shown in FIGS. 7 and 8. In the figure, a through hole for incorporating the magnetic body 19 into the key groove 8a on the frame side is opened from the outside 8c of the key groove 8a, and the magnetic body 19 is incorporated from there, thereby facilitating the manufacture. . Further, the key 10b of the Oldham ring 10 also has a through hole 52
It is possible to facilitate manufacturing by opening the opening and incorporating the magnetic body 19 therein. At this time, each magnetic material 19
As shown in FIG. 8, the arrangement is such that the N pole 19a is arranged on the wall surface 8b side of the key groove, and the S pole 19b is arranged on the wall surface 8b 'side of the key groove. , So that repulsive forces 20, 20 'of the same magnitude are generated.
The N pole 19a and the S pole 19b may be arranged in the opposite manner to that of FIG.

According to this structure, the magnetic body is installed on the wall surface of the keyway by forming the through hole from the portion opposite to the wall surface and inserting and fixing the magnetic body 19. As a result, the machining work can be easily performed, and the machining accuracy can be sufficiently improved.

According to the present invention, a magnetic body composed of a permanent magnet or the like is incorporated in a portion that has conventionally slid to generate a repulsive force to support each member in a non-contact manner or even if the members contact each other. Since it is possible to reduce the surface pressure of the oil, if an excessive load is applied to the Oldham ring due to a decrease in the amount of oil supply, a decrease in oil viscosity, mixing of liquid refrigerant, external vibration, etc.
Wear can be prevented or reduced under any condition. Further, in the structure which holds the Oldham ring and the frame and the orbiting scroll in a non-contact manner,
Since the state can be maintained permanently, the reliability is greatly improved, and labor saving for maintenance and inspection can be achieved.

[0028]

According to the present invention, the anti-rotation mechanism of the orbiting scroll is constituted by using a magnetic body,
What held the orbiting scroll by the sliding part,
By adopting a configuration in which the contact pressure or the surface pressure of the contact surface is reduced, it is possible to prevent or reduce the wear of the portion corresponding to the conventional sliding portion. Therefore, the reliability of the scroll compressor can be improved.

[Brief description of 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 partial enlarged cross-sectional view of a key groove portion on the frame side according to another embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a portion in which a rail is provided in a key groove on the frame side according to another embodiment of the present invention.

FIG. 7 is a partially enlarged sectional view of a key groove portion on a frame side according to still 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;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Airtight container, 2 ... Compressor part, 3 ... Electric motor part, 4 ... Fixed scroll, 5 ... Orbiting scroll, 5d ... Orbiting scroll key groove, 8 ... Frame, 8a ... Frame key groove, 9 ...
Main shaft, 9a ... Oil supply hole, 10 ... Oldham ring, 16 ... Compressor bottom oil sump, 18 ... Balance weight, 19 ... Permanent magnet or magnetic material, 19a ... N pole, 19b ... S pole, 2
0, 20 '... Repulsive force, 21 ... Weighted, 22 ... Rail,

Claims (3)

[Claims] 1. A scroll compressor comprising a compression mechanism in which an orbiting scroll and a fixed scroll are combined, a frame to which the fixed scroll is attached, and an Oldham ring for preventing rotation of the orbiting scroll. A scroll compressor in which a magnetic body that generates a repulsive force in a rotational direction is installed in a key and a key groove formed in a swivel scroll and a frame that engage with an Oldham ring. 2. The scroll compressor according to claim 1, wherein the magnetic body is a permanent magnet, and the same poles are arranged facing each other at the facing portions of the key and the key groove. A scroll compressor. 3. A scroll compressor comprising a compression mechanism in which an orbiting scroll and a fixed scroll are combined, a frame to which the fixed scroll is attached, and a rotation preventing means for preventing rotation of the orbiting scroll. A scroll compressor in which a magnetic body that generates a repulsive force in the rotational direction is installed at a portion facing the rotational direction of the frame and the orbiting scroll.