JP3643685B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor used for a vacuum pump, an air pump, a refrigerator, an air conditioner, and the like.
[0002]
[Prior art]
Conventionally, a scroll compressor 1A used in a refrigeration cycle such as an air conditioner has a configuration shown in FIG. 8 , for example.
An electric element 2 and a scroll compression element 3 are housed inside a cylindrical sealed container 1 whose both ends are closed. The electric element 2 includes a stator 4 fixed to the inner wall surface of the hermetic container 1 and a rotor 5 rotatably supported on the inner side of the stator 4, and a rotating shaft 6 passes through the rotor 5. Is bound to. The crank portion 7 of the rotary shaft 6 is rotatably supported by a support frame 8 that constitutes a part of the scroll compression element 3. The other end side of the rotating shaft 6 protrudes from the rotor 5, and the tip portion extends downward so as to be immersed in the lubricating oil b accommodated in the sealed container 1.
The rotating shaft 6 is provided with an oil passage 9 that sucks and supplies the lubricating oil b in the axial direction, and the lubricating oil passes through the oil passage 9 to each sliding portion such as the support frame 8. After being supplied, it is recycled.
[0003]
One end portion of the rotating shaft 6 supported so as to penetrate through the support frame 8 is formed as an eccentric portion 10 whose center is eccentric from the axis of the rotating shaft 6. A rocking scroll 11 is connected to the part 10. The swing scroll 11 has a boss hole 13 to which the eccentric portion 10 is connected at the center of one side surface of the end plate 12 formed in a disk shape. A spiral wrap 14 is integrally formed on the other side surface of the end plate 12 of the swing scroll 11.
A fixed scroll 15 is fixedly coupled to the support frame 8. A spiral wrap 16 is formed on the fixed scroll 15 at a portion facing the rocking scroll 11, and a plurality of compression chambers 17 are formed between the fixed scroll 15 and the wrap 14. These compression chambers 17 suck in the refrigerant gas at the outer peripheral portion via the suction pipe 18 and gradually move to the center to reduce the volume and compress the refrigerant gas. From the discharge port 19 provided in the center of the side surface, the oil is discharged into the high-pressure space in the sealed container 1, and the lubricating oil accompanying the space is separated, and the pulsation is reduced and discharged from the discharge pipe 20.
An Oldham ring 21 is interposed between the fixed scroll 15 constituting the scroll compression element 3 and the swing scroll 11, and this Oldham ring 21 swings with respect to the fixed scroll 15 by driving the electric element 2. The scroll 11 is revolved on a circular path so as not to rotate.
[0004]
FIG. 9 is an enlarged explanatory view showing the vicinity of the scroll compression element 3 of the scroll compressor 1A shown in FIG. 8 , and FIG. 10 is a perspective view of the Oldham ring 21. As shown in FIG. The Oldham ring 21 is integrally provided with two first keys 22 and two second keys 23 so as to protrude upward on the same plane side. The pair of first keys 22 orthogonal to the second key 23 is higher than the second key 23 (Japanese Patent Laid-Open No. 2-227581).
The first key 22 is fitted in the side groove 24 of the fixed scroll 15, and the second key 23 is fitted in the side groove 25 of the swing scroll 11.
The sliding portion of the first key 22 and the second key 23 is configured so that the lubricant supplied from the oil passage 9 of the rotating shaft 6 through the shaft hole provided in the eccentric portion 10 slides on the inner and outer surfaces of the boss hole 13. Through this portion, it communicates with the inner space of the support frame 8, and is further lubricated by lubricating oil partially flowing out through the thrust surface of the support frame 8 and the end plate 12 of the orbiting scroll 11.
Since the surface 26 of the Oldham ring 21 is located below the thrust surface of the support frame 8 and the end plate 22 of the orbiting scroll 11 due to its mechanism, the lubricating oil falls below the thrust surface and is above the thrust surface. Lubricating oil is difficult to pass through to each key, and in particular, the first key 22 is higher than the second key 23, so that there is a problem that sufficient lubrication is not performed.
Further, the length L in the radial direction of the second key 23 of the conventional Oldham ring 21 is the same as the length W in the radial direction of the Oldham ring 21 provided with the second key 23 (L = W). Therefore, there is a problem that it is difficult to obtain a sufficient sliding area.
[0005]
[Problems to be solved by the invention]
An object of the present invention, Ru der to provide a scroll compressor as lubrication of first keys 22 of the Oldham ring 21 is sufficiently performed.
[0006]
[Means for Solving the Problems]
Specifically, in order to solve the above-mentioned problems, the invention of claim 1 includes a fixed scroll, an orbiting scroll that is engaged with the fixed scroll and surrounded by the fixed scroll and a support frame, and an end plate of the orbiting scroll. A scroll compressor having an Oldham ring-oscillating scroll coupling means by an Oldham ring arranged in parallel with the drive mechanism for preventing rotation of the orbiting scroll and revolving motion with respect to the fixed scroll. A first key extending from the fixed scroll and projecting below the thrust surface of the support frame and the end plate of the orbiting scroll is provided, and the Oldham ring is provided with a groove fitted to the first key, Oldhamlin provided with a second key that fits into the side groove of the orbiting scroll at a position orthogonal to the groove. The is characterized in that it comprises.
Since the sliding portion of the first key protruding downward from the fixed scroll is positioned below the thrust surface between the support frame and the end plate of the orbiting scroll, it is lubricated by the lubricating oil supplied from the thrust surface. , Improved lubrication characteristics.
[0007]
According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the fixed scroll is formed so as to be divided from the first key, and further includes a coupling portion for coupling the first key. It is characterized by.
[0008]
According to a third aspect of the present invention, in the scroll compressor according to the second aspect, the first key is formed of a wear-resistant member.
By selecting the optimal material with wear resistance from castings, sintered materials, aluminum materials, etc., corresponding to the material of the 1st key for the material of the Oldham ring, Oldham has a small load area with respect to the load and severe lubrication conditions. The reliability of the sliding part between the ring and the first key can be improved.
[0009]
According to a fourth aspect of the present invention, in the scroll compressor according to any one of the first to third aspects, the second key protrudes radially inward from the inner peripheral surface of the Oldham ring. It is characterized by having made it.
[00 10 ]
DETAILED DESCRIPTION OF THE INVENTION
It will be described in detail with reference to embodiments of the present invention with reference to the drawings shown in FIGS. 1-7.
FIG. 1 is an explanatory view showing an enlarged main part of a compression element 3A in the scroll compressor 1B of the present invention, and FIG. 2 is a perspective view of a fixed scroll 15A of the compression element 3A in the scroll compressor 1B of the present invention. FIG. 3 is a perspective view of the Oldham ring 21A of the compression element 3A in the scroll compressor 1B of the present invention.
The first key 22A is formed separately from the fixed scroll 15A, and has a female screw hole (not shown) in a direction parallel to the axial direction of the rotary shaft 6. A U-shaped convex portion 27 for inserting and fixing the first key on the fixed scroll 15A side is provided opposite to each other, and a bolt through hole (not shown) is formed on the top of the U-shaped convex portion 27. The first key 22A is integrally fixed to the fixed scroll 15A using a bolt 28. The fixed first key 22 </ b> A extends downward from the fixed scroll 15 </ b> A and projects below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11.
The Oldham ring 21A is provided with a groove 29 that engages with the first key 22A, and a second key 23 that engages with the side groove 25 of the orbiting scroll 11 at a position orthogonal to the groove 29. ing.
The sliding portion of the first key 22A protruding downward from the fixed scroll 15A is positioned below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, so that the lubricating oil supplied from the thrust surface Therefore, lubrication characteristics are improved.
[00 11 ]
FIG. 4 is an explanatory view showing, in an enlarged manner, a main part of a compression element 3B in another scroll compressor 1C of the present invention, and FIG. 5 is an illustration of fixing the scroll compression element 3B in another scroll compressor 1C of the present invention. It is a perspective view of scroll 15B. The first key 22B is formed separately from the fixed scroll 15B. The first key 22B is provided with a bolt through hole (not shown) in a direction orthogonal to the axial direction of the rotary shaft 6. The fixed scroll 15B side has a joint surface for coupling with only one side surface of the first key 22B, and a bolt female screw (not shown) for fastening the first key 22B through the bolt through hole is provided. A convex portion 30 is provided, and the first key 22B is integrally fixed to the fixed scroll 15B using a bolt 28.
The Oldham ring uses the Oldham ring 21A shown in FIG.
The Oldham ring 21A is provided with a groove 29 for fitting with the first key 22B, and a second key 23 for fitting with the side groove 25 of the orbiting scroll 11 at a position orthogonal to the groove 29. ing.
The sliding portion of the first key 22B protruding downward from the fixed scroll 15B is positioned below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, so that the lubricating oil supplied from the thrust surface Therefore, lubrication characteristics are improved. Since the first key 22B is fixed by a bolt 28 in a direction perpendicular to the axial direction of the rotary shaft 6, the mounting strength is large, and the first key 22B is stably fixed without tilting during operation.
[00 12 ]
FIG. 6 is an explanatory view showing an enlarged main part of the scroll compression element 3C in another scroll compressor 1D of the present invention, and FIG. 7 is an illustration of the scroll compression element 3C in another scroll compressor 1D of the present invention. It is a perspective view of fixed scroll 15C. The first key 22C is formed separately from the fixed scroll 15C, and the first key 22C is provided with a bolt through hole (not shown) in a direction orthogonal to the axial direction of the rotary shaft 6. On the fixed scroll 15C side, there is a groove 31 for sandwiching and coupling the first key 22C, and a female screw hole (not shown) is provided on one side surface 32 of the groove 31, and a bolt penetration (not shown) is provided on the other side surface 33. A protrusion having a hole is provided, and the first key 22C is integrally fixed to the fixed scroll 15C using a bolt 28.
The Oldham ring uses the Oldham ring 21A shown in FIG.
The Oldham ring 21A is provided with a groove 29 for fitting with the first key 22C, and a second key 23 for fitting with the side groove 25 of the orbiting scroll 11 at a position orthogonal to the groove 29. ing.
The sliding portion of the first key 22C protruding downward from the fixed scroll 15C is positioned below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, so that the lubricating oil supplied from the thrust surface Therefore, lubrication characteristics are improved. Since the first key 22C is sandwiched in the groove 31 and fixed by a bolt 28 in a direction orthogonal to the axial direction of the rotary shaft 6, the mounting strength is further increased, and the first key 22C does not tilt during operation and is stable. Fixed.
[00 13 ]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit described in the claims.
[00 14 ]
【The invention's effect】
According to the scroll compressor of the present invention, the sliding part of the first key of the Oldham ring is positioned below the thrust surface between the support frame and the end plate of the swing scroll, so that the end plate of the support frame and the swing scroll is obtained. Therefore, the lubricating characteristics are improved. If the first key is fixed with a bolt in a direction orthogonal to the axial direction of the rotary shaft, the mounting strength is high, and the first key does not tilt during operation. If the first key is sandwiched in the groove and fixed with a bolt in a direction perpendicular to the axial direction of the rotary shaft, the mounting strength is further increased.
By selecting the optimal material with wear resistance from castings, sintered materials, aluminum materials, etc., corresponding to the material of the 1st key corresponding to the material of the Oldham ring, Oldham has a small load area with respect to load and severe lubrication conditions Ru can improve the reliability of the sliding portions between the ring and the first key.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an enlarged main part of a scroll compressor according to the present invention.
FIG. 2 is a perspective view of a fixed scroll of the scroll compressor of the present invention shown in FIG.
FIG. 3 is a perspective view of an Oldham ring of the scroll compressor of the present invention shown in FIG. 1;
FIG. 4 is an explanatory view showing an enlarged main part of another scroll compressor of the present invention.
5 is a perspective view of a fixed scroll of another scroll compressor of the present invention shown in FIG. 4. FIG.
FIG. 6 is an explanatory view showing an enlarged main part of another scroll compressor of the present invention.
7 is a perspective view of a fixed scroll of another scroll compressor of the present invention shown in FIG. 6. FIG.
FIG. 8 is a cross-sectional explanatory diagram of a conventional scroll compressor.
FIG. 9 is an explanatory view showing, in an enlarged manner, the vicinity of a scroll compression element of the conventional scroll compressor shown in FIG. 8 ;
10 is a perspective view of an Oldham ring of the conventional scroll compressor shown in FIG. 8. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1A Scroll type compressor 1B, 1C, 1D Scroll compressor 1 Sealed container 2 Electric element 3, 3A, 3B, 3C Scroll compression element 4 Stator 5 Rotor 6 Rotating shaft 7 Crank part 8 Support frame 9 Oil passage 10 Eccentric part 11 Shaking moving scroll 12 end plate 13 boss hole portions 14 and 16 wrap 15, 15A, 15B, 15C fixed scroll 21, 21 a Oldham ring 22, 22A, 22B, 22C groove 25 swing scroll of the first key 23 second key 24 fixed scroll Side groove 26 Oldham's ring plane 27 U-shaped convex portion 28 Bolt 29 Groove 30 Convex portion 31 Groove 32 side surface side 33 Other side surface side

Claims (4)

  An Oldham ring-oscillation by a fixed scroll, an orbiting scroll that is engaged with the fixed scroll and surrounded by the fixed scroll and a support frame, and an Oldham ring that is arranged in parallel with the end plate of the orbiting scroll A scroll compressor having a drive mechanism for preventing rotation of the orbiting scroll and revolving with respect to the fixed scroll, wherein the support frame and the orbiting scroll are extended from the fixed scroll. A first key protruding below the thrust surface of the end plate is provided, the Oldham ring is provided with a groove to be fitted with the first key, and the groove of the orbiting scroll is provided at a position perpendicular to the groove. A scroll compressor comprising an Oldham ring having a second key to be fitted.   2. The scroll compressor according to claim 1, wherein the fixed scroll is formed so as to be divided from the first key, and further includes a coupling portion that couples the first key.   The scroll compressor according to claim 2, wherein the first key is formed of a wear-resistant member.   4. The scroll compressor according to claim 1, wherein the second key has an end face in a radial direction projecting inward from an inner peripheral surface of the Oldham ring. 5.

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