JP2004019488A - Scroll type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll type compressor capable of preventing abnormal abrasion by seizure of a key, by lubricating a sliding surface without raking lubricating oil with an key edge region of an Oldham's ring. <P>SOLUTION: A side face section in which a key 3 (1) slides with a side wall of a key groove is formed of a planar sliding surface in a central section and curved sliding surfaces extending to both sides of the planar sliding surface. The relation L<SB>2</SB>>L<SB>3</SB>is established, when the key width of the sliding surface side is L<SB>0</SB>, the width of the central planar sliding surface is L<SB>1</SB>, the width of the outer diameter side of the Oldham's ring of the curved sliding surfaces is L<SB>2</SB>, and the width the inner diameter side is L<SB>3</SB>. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a scroll compressor used as a refrigerant compressor or an air compressor for refrigeration and air conditioning.
[0002]
[Prior art]
In recent years, conversion to alternative CFCs, which removes chlorine, which is a major factor in the destruction of the ozone layer in the atmosphere, has been progressing, and regulations have been strengthened year by year. The reliability of the sliding part in the compressor is maintained by the lubricating oil in which the refrigerant is dissolved, so these non-chlorine-based alternative chlorofluorocarbon refrigerants cannot expect a lubricating effect under the extreme pressure of chlorine, and the sliding environment Is getting tougher. In particular, since the inside of the compressor is at a high temperature and a high pressure, resulting in a severe sliding atmosphere, ensuring reliability is an important issue.
[0003]
In a scroll type compressor, an Oldham ring used for a rotation preventing mechanism of an orbiting scroll is provided on a surface of the Oldham ring as described in, for example, JP-A-6-249163, as a technique for securing its reliability. Some of them are subjected to surface treatment by electroless Ni-P plating. Further, as described in Japanese Patent Application Laid-Open No. 9-32749, there is known an Oldham ring in which a taper is provided over the entire length of a key sliding surface to prevent seizure and abnormal wear of the sliding surface. . Recently, as described in Japanese Patent Application Laid-Open No. H11-82339, an Oldham ring having a curved surface portion (R portion) extending to an arbitrary range at both ends of a key sliding surface is known.
Other related techniques include, for example, those described in JP-A-11-82339.
[0004]
[Problems to be solved by the invention]
During operation of the scroll compressor, the key 3 (1) of the Oldham ring is inclined in the rotation direction (load direction) of the rotating shaft 9 within the key groove of the frame 2, as shown in FIG. For this reason, on the Oldham ring inner diameter side of the key 3 (1) of the Oldham ring, the inclination of the key 3 (1) causes a gap between the key groove side surface of the frame 2 (or orbiting scroll) and the key portion sliding surface. Can be. This gap facilitates the introduction of lubricating oil to the sliding surface indicated by the thin arrow. On the other hand, on the outside diameter side of the Oldham ring of the key 3 (1), the key 3 (1) is brought into a state of hitting against the side face of the key groove due to the inclination, and the lubricating oil is scraped off by the key corner. Therefore, no lubricating oil is introduced into the sliding surface, and the lubricating state becomes severe. Therefore, when the key 3 (1) moves to the outer diameter side of the Oldham ring, the oil film is broken at one contact portion, and the sliding surface of the key 3 (1) is seized or abnormal due to stick-slip or knocking wear. Wear tends to occur.
[0005]
SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to prevent sliding of lubricating oil by the key corners even when the Oldham key slides in the key groove with the key corners contacting one side. An object of the present invention is to provide a scroll compressor capable of lubricating a moving surface and preventing abnormal wear due to running out of oil or burning of a key.
Another object of the present invention is to provide a scroll type compressor capable of preventing occurrence of burrs and burrs during machining by adding a face to a key corner.
It is a further object of the present invention to provide a scroll compressor in which the reliability of the Oldham ring can be ensured only by changing the chamfered shape of the key, so that the processing cost can be reduced as compared with surface treatment or taper processing. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a scroll type compressor according to the present invention includes a fixed scroll, an orbiting scroll, and a frame that is integrated with the fixed scroll and supports the orbiting scroll. A compression mechanism configured to form a compression chamber by meshing the wraps with each other, an Oldham ring interposed between the orbiting scroll and the frame to prevent the orbiting scroll from rotating, and formed on both surfaces of the Oldham ring. In a scroll compressor in which a key slides reciprocally in a key groove formed in the orbiting scroll and the frame, a side portion on which the key slides on a side wall of the key groove has a flat sliding surface at a central portion. When formed in a curved sliding surface which extends on both sides of the plane-shaped sliding surface, the key width of the sliding surface side L _0, planar sliding of the central Width L ₁ of _a width L ₂ of the outer diameter side of the Oldham ring of the curved surface shape sliding _surface, when the width of the inner diameter side is L _3, it is an L _2> L _3.
More specifically, the flat sliding surface at the central portion and the curved sliding surface extending on both sides of the flat sliding surface are side surfaces on which the key slides with the key groove by rotation of a rotating shaft. It is formed only in the part.
Further, the planar sliding surface at the central portion and the curved sliding surface extending to one side of the planar sliding surface are sides on which the key slides with the key groove by rotation of a rotating shaft. Therefore, it is formed only on the outside diameter side of the Oldham ring.
[0007]
In order to achieve the above object, another aspect of the scroll compressor according to the present invention is directed to a scroll type compressor, wherein a side portion on which the key slides with a side wall of the key groove has a flat sliding surface at a central portion, and a flat sliding surface at the center portion. The key is formed of a curved sliding surface on the outside diameter side of the Oldham ring that extends to the sliding surface, the entire width of the key on the sliding surface side is L ₀ , and the width of the central planar sliding surface is L _1. , when the width of the Oldham ring outer diameter side of the curved surface shaped sliding surface is _{L 2,} it is an L _{2 =} L 0 -L _1.
[0008]
In order to achieve the above object, a still further aspect of the present invention provides a scroll type compressor, wherein a side portion on which the key slides with a side wall of the key groove has a flat sliding surface at a central portion, A curved sliding surface extending on both sides of the curved sliding surface, wherein the curved sliding surface is formed by a curved surface and a surface extending on the curved sliding surface. It is.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an embodiment according to the scroll compressor of the present invention (the right half is a portion where a keyway is formed in an orbiting scroll, and the left half is a portion where a keyway is formed in a frame. 2 is a detailed view of the Oldham ring, (1A) is a plan view, (2A) is a side view, (3A) is a cross-sectional view taken along line XX, and FIG. In the enlarged view, (1A) is an explanatory view of a square portion, and (2A) is an enlarged view of a corner portion.
[0010]
In FIG. 1, a keyway 2a (see FIG. 3; see FIG. 3) is formed linearly on a frame 2 attached to a pressure vessel 1 and arranged on the left and right about a rotation shaft 6 (described in detail later). Only the right side is shown), keys 3 (3) and (4) of the Oldham ring 3 are fitted. The orbiting scroll 4 is disposed on the Oldham ring 3, and the fixed scroll 5 is screwed to the frame 2. The rotating shaft 6 is connected to the orbiting scroll 4 via a lower bearing 7 and a main bearing 8 fixed by being press-fitted into the frame 2 and a orbiting bearing 9 which is press-fitted into a boss portion of the orbiting scroll 4. I have. A compression mechanism is provided above the closed container 1, and a motor unit is provided below the closed container 1. A lubricating oil reservoir 10 is provided at the bottom of the closed container 1.
[0011]
The compression mechanism section includes a fixed scroll 5 and an orbiting scroll 4, and a frame 2 that is integrated with the fixed scroll 5 and supports the orbiting scroll 4. Is formed. Further, between the orbiting scroll 4 and the frame 2, the above-mentioned Oldham ring 3 for preventing the orbiting scroll 4 from rotating is provided.
[0012]
The motor unit includes a stator 11 and a rotor 12, and the stator 11 is fixed to the pressure vessel 1 by shrink fitting, and the rotor 12 is fixed to the rotating shaft 6 by shrink fitting. The Oldham ring 3 is a mechanism that prevents the orbiting scroll 4 from rotating and makes a revolving motion. The keys 3 (1) and 3 (2) on the upper surface of the Oldham ring 3 are engaged with a key groove 4a on the back of the orbiting scroll 4. The keys 3 (3) and 3 (4) on the lower surface are engaged with the key grooves 2a of the stationary base 2b of the frame 2.
[0013]
The stator 11 of the electric motor is press-fitted and fastened to the closed casing 1, and causes the orbiting scroll 4 to orbit through the rotating shaft 6. The rotating shaft 6 is fitted to a lower bearing 7 and a main bearing 8 which are fixed by being press-fitted into the frame 2, and a turning bearing 9 which is press-fitted to a boss portion of the orbiting scroll 4. When the electric motor is driven, the orbiting scroll 4 is driven via the rotating shaft 6, the lower bearing 7, the main bearing 8, and the orbiting bearing 9. The orbiting scroll 4 is prevented from rotating by the Oldham ring 3 and revolves in a circular orbit determined by the amount of eccentricity of the rotating shaft 6.
[0014]
An oil supply passage 13 for guiding lubricating oil to the main bearing 8, the lower bearing 7, and the slewing bearing 9 is provided in the rotating shaft 6, and the lubricating oil in the oil reservoir 10 is sucked up at the lower end of the rotating shaft 6 and sent to the oil supply passage 13. An oil supply pipe 14 is provided. When the orbiting scroll 4 orbits, the volume decreases as the space (compression chamber) formed by the orbiting scroll 5 and the fixed scroll 5 moves toward the center of the scroll, and the sucked refrigerant gas is compressed. The compressed refrigerant gas is discharged from a discharge port 15 provided at the center of the fixed scroll 5 to an upper space 16 in the closed container 1. In addition, an intermediate pressure chamber 17 for guiding gas in a compression stroke is formed on the back surface of the orbiting scroll 4. The pressure of the intermediate pressure chamber 17 is intermediate between the suction pressure and the discharge pressure of the refrigerant gas, and the oil supply to the sliding portion between the orbiting scroll 4 and the fixed scroll 5 is performed by the discharge pressure and the pressure of the intermediate pressure chamber 17. This is done using the difference. After lubricating the main bearing 8, the lower bearing 7, and the slewing bearing 9 through the oil supply passage 13 from the oil supply pipe 14, the lubricating oil flows into the compression chamber through the intermediate pressure chamber 17 and is mixed with the refrigerant gas. The liquid is discharged from an outlet 15 at the center of the fixed scroll 5 to an upper space 16 in the closed container 1. The lubricating oil that has flowed into the intermediate pressure chamber 17 is splashed by a balance weight 18 onto the sliding portion of the Oldham ring 3 and supplied.
[0015]
The shape of the keys 3 (1) to 3 (4) of the Oldham ring 3 will be described in detail with reference to FIGS.
As described above, the keys 3 (1) and 3 (2) are formed on the upper surface (the orbiting scroll side) of the Oldham ring 3 linearly, that is, at intervals of 180 degrees, and the keys 3 (1) and 3 (2) are also formed on the lower surface (frame side) in the figure. Keys 3 (3) and 3 (4) are formed at a position shifted by 90 degrees from 1) and 3 (2) on a straight line, that is, at an interval of 180 degrees.
[0016]
The details of the square portions 3 (a) to 3 (c) of the keys 3 (1) to 3 (4) have the shapes shown in (1A) and (2A) of FIG. Key 3 (1) to 3 (4) the side portion of the side wall and the sliding key groove 4a of the key groove 2a or orbiting scroll 4 frame 2, a planar sliding surface P ₁ of the central portion, a planar sliding It is formed of curved sliding surfaces P ₂ and P ₃ extending on both sides of the moving surface P _1, the overall key width on the sliding surface side is L ₀ , the width of the central planar sliding surface is L ₁ , and the curved surface When the width on the outer diameter side of the Oldham ring is L ₂ and the width on the inner diameter side of the sliding surface is L ₃ , L ₂ > L ₃ .
[0017]
The reason is that during the operation of the compressor, the Oldham ring 3 is inclined in the direction of rotation of the rotary shaft 6 (the direction of the load indicated by the arrow) in the key 2a groove of the frame 2 (see FIG. 4). For this reason, in the prior art, on the inner diameter side of the Oldham ring of the key 3 (1), a gap is formed between the key groove side surface of the frame 2 and the orbiting scroll 4 and the key part sliding surface due to the inclination of the key 3 (1). it can. This gap facilitates the introduction of lubricating oil to the sliding surface indicated by the thin arrow. On the other hand, on the outside diameter side of the key 3 (1) of the Oldham ring, the key 3 (1) comes into a state of one-side contact with the side face of the key groove due to the inclination, and the lubricating oil is scraped off by the key corner. Therefore, no lubricating oil is introduced into the sliding surface, and the lubricating state becomes severe.
[0018]
However, in this embodiment, since L ₂ > L ₃ , lubricating oil is more easily introduced on the outer diameter side of the key 3 (1) on the Oldham ring, and the lubricating state at the key corners is improved. In addition, the effect of preventing abnormal wear caused by oil film breakage or seizure is improved.
[0019]
Further, the planar sliding surface _{P 1} and curved sliding surface _P 2, _{P 3} of the central portion, the key 3 (1) to 3 (4) by rotation of the rotary shaft 6 and the key groove 2a or 4a slide Alternatively, it may be formed only on the side surface portion, and in this case, the processing on the non-sliding side of the curved sliding surface is omitted, so that the processing cost can be reduced.
[0020]
Further, the planar sliding surface _{P 1} and curved sliding surface _P 2, _{P 3} of the central portion, the key 3 by the rotation of the rotary shaft 6 (1) to 3 (4) of the key groove 2a or 4a and sliding And may be formed only on the outer diameter side of the Oldham ring 3. In this case, since the processing is further omitted, the processing cost is further reduced.
[0021]
As another example, the side surface portions of the key 3 (1) to 3 (4) slides and the side wall of the keyway, a planar sliding surface P ₁ of the central portion, the Oldham ring outer diameter side of the curved sliding formed by the sliding surface P _2, key 3 (1) to 3 full width of the sliding surface side L _0, the width of the central planar sliding surface of L _1, the curved sliding surface (4) Oldham when the width of the ring outer diameter side is _{L 2,} it can be L _{2 =} L 0 -L _1.
[0022]
Most also in this embodiment, with machining costs because machining of the corner portion on the inner diameter side of the Oldham ring 3 key 3 (1) to 3 (4) is omitted is reduced, the width L _1, L ₂ The lubrication state is further improved, and the effect of preventing abnormal wear due to oil film breakage or seizure is further improved.
[0023]
In yet another embodiment, the key 3 (1) to 3 (4) of the side surface portion slides on the side wall of the keyway, a planar sliding surface P ₁ of the central portion, on both sides of a planar sliding surface is formed with a curved sliding surface P _2, P ₃ which is extended, curved sliding surface P _2, P ₃ is formed by a curved surface, the face that is extended in a curved surface sliding surface Things.
[0024]
According to the present embodiment, formation of burrs and burrs during processing can be prevented by forming the faces.
[0025]
【The invention's effect】
As described above, according to the present invention, even when the Oldham's key slides in a state where the key corners are in contact with each other in the key groove, the lubricating oil is not scraped off by the key corners. A scroll compressor capable of lubricating the sliding surface and preventing seizure of a key and abnormal wear can be obtained.
Further, according to the present invention, a scroll type compressor capable of preventing occurrence of burrs and burrs at the time of machining by adding a face to a key corner can be obtained.
Further, according to the present invention, since the reliability of the Oldham ring can be ensured only by changing the chamfered shape of the key, a scroll-type compressor that can reduce the processing cost as compared with surface treatment, taper processing, or the like can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment according to a scroll compressor of the present invention.
FIG. 2 is a detailed view of the Oldham ring, (1A) is a plan view, (2A) is a side view, and (3A) is a cross-sectional view taken along line XX.
FIG. 3 is an enlarged view of a key, (1A) is an explanatory view of a square portion, and (2A) is an enlarged view of a corner portion.
FIG. 4 is a diagram showing a state when a key slides.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pressure vessel, 2 ... Frame, 2a, 4a ... Keyway, 2b ... Frame stationary pedestal, 3 ... Oldham ring, 3 (1) -3 (4) ... Key, 4 ... Orbiting scroll, 5 ... Fixed scroll, Reference numeral 6: rotating shaft, 7: lower bearing, 8: main bearing, 9: slewing bearing, 10: oil reservoir, 11: stator of electric motor, 12: rotor of electric motor, 13: oil supply passage, 14: oil supply pipe, 15 ... discharge port, 16 ... upper space in the pressure vessel, 18 ... intermediate pressure chamber, 19 ... balance weight.

Claims (5)

A fixed scroll, an orbiting scroll, and a frame integrated with the fixed scroll to support the orbiting scroll; and a compression mechanism configured to engage a wrap of the fixed scroll and the orbiting scroll to form a compression chamber. An Oldham ring for preventing rotation of the orbiting scroll is interposed between the orbiting scroll and the frame, and keys formed on both surfaces of the Oldham ring reciprocate in key grooves formed in the orbiting scroll and the frame. In a sliding scroll compressor,
A side surface portion on which the key slides with a side wall of the key groove is formed by a planar sliding surface at a central portion and a curved sliding surface extending on both sides of the planar sliding surface,
When the width of the outside diameter side of the curved sliding surface is L ₂ and the width of the inside diameter side is L ₃ , L ₂ > L ₃ is satisfied. The flat sliding surface in the central portion and the curved sliding surface extending on both sides of the flat sliding surface are formed only on the side surface on which the key slides with the key groove by rotation of a rotating shaft. The scroll compressor according to claim 1, wherein the scroll compressor is operated. The flat sliding surface of the central portion and the curved sliding surface extending to one side of the flat sliding surface are sides on which the key slides with the key groove by rotation of a rotating shaft, 3. The scroll compressor according to claim 2, wherein the scroll compressor is formed only on the outer diameter side of the Oldham ring. A fixed scroll, an orbiting scroll, and a frame integrated with the fixed scroll to support the orbiting scroll; and a compression mechanism configured to engage a wrap of the fixed scroll and the orbiting scroll to form a compression chamber. An Oldham ring intervening between the orbiting scroll and the frame for preventing rotation of the orbiting scroll is interposed, and keys formed on both surfaces of the Oldham ring reciprocate between the orbiting scroll and key grooves formed in the frame. In a sliding scroll compressor,
The side surface portion on which the key slides on the side wall of the key groove has a flat sliding surface at the center and a curved sliding surface on the outer diameter side of the Oldham ring extending to the flat sliding surface. Formed,
When the total width of the key on the sliding surface side is L ₀ , the width of the central flat sliding surface is L ₁ , and the width of the curved sliding surface on the Oldham ring outer diameter side is L ₂ , L ₂ = _L 0 -L ₁ a scroll type compressor, characterized by. A fixed scroll, an orbiting scroll, and a frame integrated with the fixed scroll to support the orbiting scroll; and a compression mechanism configured to engage a wrap of the fixed scroll and the orbiting scroll to form a compression chamber. An Oldham ring for preventing rotation of the orbiting scroll is interposed between the orbiting scroll and the frame, and keys formed on both surfaces of the Oldham ring reciprocate in key grooves formed in the orbiting scroll and the frame. In a sliding scroll compressor,
A side surface portion on which the key slides with a side wall of the key groove is formed by a planar sliding surface at a central portion and a curved sliding surface extending on both sides of the planar sliding surface,
The scroll-type compressor, wherein the curved sliding surface is formed by a curved surface and a face extending from the curved sliding surface.

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