JP3951349B2 - Scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor, and more particularly to a scroll compressor used in refrigeration and air conditioning equipment.
[0002]
[Prior art]
For example, a conventional scroll compressor disclosed in JP-A-6-137284 is configured as shown in FIG.
In the figure, 8 is an airtight container, 9 is a rotor of an electric motor housed inside the airtight container, 10 is a crankshaft fixed to the rotor, 5 is a fixed scroll disposed inside the airtight container, An oscillating scroll that compresses fluid in cooperation with a fixed scroll, 12 is an oscillating shaft, 10a is an eccentric hole provided at one end of the crankshaft, 6 is an oscillating bearing provided at the eccentric hole, 3 A first frame, 11 is provided on the first frame, and is a main bearing that rotatably supports the crank, 4 is a second frame, and 7 is provided on the second frame and rotatably supports the crankshaft. This is a secondary bearing. Both the main bearing and the sub-bearing are fitted to the crankshaft with a slight gap.
[0003]
Next, the operation will be described. During the operation of the compressor, the rotational force generated by the electric motor is transmitted to the crankshaft 10 and is transmitted to the swinging scroll 1 through the swinging bearing 6 and the swinging shaft 12 of the eccentric hole 10a. The swing scroll 1 performs a revolving motion that moves on a circular orbit by an Oldham ring (not shown), which is a well-known anti-rotation mechanism, and follows a change in the volume of the compression chamber formed between the fixed scroll 5 and the swing scroll 1. Fluid compression is performed. At this time, a refrigerant compression load Fg acting on the rocking scroll 1 and a centrifugal force Fc of the rocking scroll 1 act on the rocking shaft 12, and are applied to the crankshaft 10 via the rocking bearing 6. Communicated.
[0004]
[Problems to be solved by the invention]
Since the conventional scroll compressor is configured as described above, the compression load Fg of the refrigerant and the centrifugal force Fc of the swing scroll act on the swing shaft. For this reason, bending deformation occurs in the swing shaft. When a deflection deformation occurs in the rocking shaft, an inclination occurs between the rocking bearing and the rocking shaft, resulting in a single contact of the rocking shaft, which reduces the load capacity of the rocking bearing and causes abnormal wear and wear of the bearing. There was a problem of causing sticking.
FIG. 15 shows the state of the swinging shaft that has caused the deflection. Since the crankshaft is supported by the main bearing and the sub-bearing with a slight gap, the crankshaft is inclined due to the minute gap, and between the rocking bearing and the rocking shaft provided at the end of the crankshaft. Inclination occurs. As a result, the load capacity of the oscillating bearing is reduced, causing abnormal wear and seizure of the bearing.
FIG. 16 shows the state of the swing shaft that is inclined.
[0005]
An object of the present invention is to solve such a conventional problem, and prevents the occurrence of damage such as wear and seizure of the bearing portion due to the contact of the swinging shaft, etc. An object is to obtain a compact compressor that is high in productivity and high in reliability and free of looseness and breakage of related members.
Another object of the present invention is to obtain a scroll compressor free from vibration and noise caused by the axial movement of the sleeve.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a scroll compressor comprising: a hermetically sealed container; a fixed scroll provided with a spiral wrap; and a spiral wrap provided in combination with the spiral wrap of the fixed scroll. An oscillating scroll for compressing fluid, an oscillating shaft provided on the side opposite to the spiral wrap of the oscillating scroll, a crankshaft rotated by an electric motor, and a bearing that rotatably supports the crankshaft. A frame provided, an eccentric hole provided at one end of the crankshaft, a rocking bearing formed on an inner peripheral surface of the eccentric hole, an oil sump for the lower portion of the sealed container, An oil pump provided in a lower portion of the crankshaft, an oil passage provided in the crankshaft and communicating with the eccentric hole and the oil pump, and an oil groove provided in the swing bearing. for example, the ground and the pivot shaft to the swing bearing - And the sleeve is connected to the swinging shaft by an engaging member so as to rotate integrally with the swinging shaft and is rotatably fitted to the swinging shaft. Corresponding to the central portion in the direction, corresponding to the outer peripheral surface of the swing shaft or the central portion in the axial direction of the swing bearing, and protruding in the direction perpendicular to the axial direction over the entire circumference on the inner peripheral surface of the sleeve A substantially disc-shaped engaging member having at least one protrusion is fixed to the lower end of the swing shaft, and a finite depth is formed at the lower end on the inner peripheral side of the sleeve. A notch is provided to connect the sleeve and the pivot shaft in the rotational direction with the protrusion and the notch, and the bottom of the notch of the sleeve on the protrusion of the engaging member. It is the seated one.
[0007]
The scroll compressor according to a second aspect of the present invention is the scroll compressor according to the first aspect of the present invention, wherein the lower end of the pivot shaft is provided with a small circumferential diameter portion smaller than the outer diameter of the circumferential portion of the engagement member, A concave portion is formed, a convex portion is provided on the inner peripheral portion of the sleeve, and the concave portion is fitted to the first concave portion with a predetermined axial gap.
[0008]
In the scroll compressor according to the third invention, in the second invention, the dimensional relationship between the axial length L1 of the sleeve and the oscillating bearing length L2 is set so that L1> L2, and the sleeve When the sleeve moves in the axial direction within the axial gap formed by the sleeve convex portion and the first concave portion, the end portion of the sleeve is prevented from lapping with the sliding surface of the rocking bearing.
[0009]
According to a fourth aspect of the present invention, there is provided the scroll compressor according to the second or third aspect , wherein the second portion is connected to a fastening portion between the fastening shaft that fastens the swing shaft and the engagement member, and the swing shaft of the engagement member. Are provided in which a small-circumferential-circular portion at the end of the swing shaft and a second recess are fitted.
[0010]
The scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to the fourth aspect , wherein at least one flat portion is provided in the small-circular diameter portion at the end of the pivot shaft, and the small-circular diameter is provided in the second recess of the engaging member. The flat part corresponding to the flat part of a part is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, in each embodiment, the same or corresponding parts as those of the conventional technology are denoted by the same reference numerals, and the description thereof is omitted.
[0012]
Embodiment 1 FIG.
FIG. 1 is an enlarged view of a main part showing Embodiment 1, and FIG. 2 is a perspective view of a sleeve 14. In addition, the other compressor whole structure drawing is equivalent to FIG. 14 shown by the prior art.
In the drawing, 13 corresponds to the substantially central portion of the rocking bearing 6, a belt-like convex portion provided on the outer periphery of the rocking shaft 12, and 14 is a substantially cylinder provided between the rocking bearing 6 and the rocking shaft 12. A sleeve 15 is an engaging member. The engaging member 15 is inserted into a small hole 12e provided in the swing shaft 12, and is fitted in a notch portion 14e provided in the inner peripheral surface of the sleeve 14 with a gap, so that the sleeve 14 and the swing shaft 12 are rotated in the rotational direction. It is linked to.
[0013]
Next, the operation will be described with reference to FIG. During operation of the compressor, centrifugal force and gas compression load act on the rocking shaft 12, and the magnitude thereof varies depending on the compressor operating conditions, so the deflection direction of the rocking shaft 12 also varies. Is inclined between the oscillating bearing 6 and the oscillating shaft 12, and is inclined between the oscillating bearing 6 and the oscillating shaft 12 due to the small gap between the main bearing 11 and the auxiliary bearing 7 shown in FIG. 14. However, in this embodiment, the sleeve 14 can move following the inclination direction and the amount of inclination of the rocking shaft 12 and the rocking bearing 6 with the belt-like convex portion serving as a fulcrum. Regardless of the operating conditions, the sleeve 14 always rotates in a parallel state with respect to the rocking bearing 11.
[0014]
As a result, it is possible to obtain a highly reliable bearing structure in which there is no risk of wear or seizure of the rocking bearing without reducing the bearing load capacity of the rocking bearing.
[0015]
FIG. 4 is another example showing the first embodiment.
12 is a swing shaft, 14 is a sleeve, and 14 f is a belt-like convex portion provided on the inner peripheral surface of the sleeve 14 corresponding to the substantially central portion of the swing bearing 6.
In FIG. 1, the band-shaped convex portion is provided on the swing shaft 12, but the same effect can be obtained by providing the belt-shaped convex portion on the inner peripheral surface of the sleeve as shown in FIG. 4.
[0016]
FIG. 5 is still another example showing the first embodiment.
Reference numeral 12 denotes a swing shaft, 14 denotes a sleeve, and 13 denotes a belt-like convex portion.
In the case shown in FIG. 5, the belt-like convex portion is formed as a barrel-shaped curved surface. The sleeve 14 can move following the inclination direction and the amount of inclination of the rocking shaft 12 and the rocking bearing with the barrel-shaped curved portion 13 as a fulcrum, and the sleeve 14 is always independent of the operating conditions of the compressor. Rotates in a state parallel to the rocking bearing 11.
[0017]
As a result, the bearing load capacity of the rocking bearing can be reduced, and a highly reliable bearing structure can be obtained without fear of wear or seizure of the rocking bearing. Therefore, there is an effect that the abnormal wear does not occur at the contact portion between the belt-like convex portion and the inner peripheral portion of the sleeve 14.
[0018]
Embodiment 2. FIG.
6, 7 and 8 show the second embodiment. The arrows in the figure indicate the flow of lubricating oil. In the figure, 16 is an oil pump, 17 is an oil reservoir, 18 is an oil passage provided in the crankshaft 10, 19 is an oil groove provided in the axial direction on the inner peripheral surface of the rocking bearing 6, and 15 is a protrusion 15a in the radial direction. The provided disc-shaped engaging member 14a is a notch having a finite depth provided at the lower inner periphery of the sleeve 14. The sleeve 14 is seated on the protrusion 15 a of the engaging member 15, and is restricted from moving downward in the axial direction. The engaging member 15 is coupled to the bottom of the swing shaft 12 by screws, welding, or the like. The space is defined by the bottom surface of the eccentric hole, the lower surface of the sleeve 14, the lower surface of the engaging member 15, and the bottom surface of the eccentric hole.
[0019]
Next, the operation will be described. The sleeve 14 is restricted from moving downward in the axial direction by a protrusion 15a and a notch 14a having a finite depth, and the engaging member 15 is fixed to the bottom of the swing shaft 12, and a space is formed at the bottom of the eccentric hole. Therefore, as shown by arrows in FIGS. 6 and 7, the lubricating oil flows into the oil groove 19 through the space between the oil passage 18 and the bottom of the eccentric hole and lubricates the rocking bearing 6. The sleeve 14 and the swing shaft 12 are connected in the rotational direction by a protrusion 15a and a notch 14a having a finite depth.
[0020]
As a result, in the scroll compressor having a structure in which the swing shaft is prevented from hitting one side (structure shown in the first embodiment), a space can be secured between the bottom of the sleeve 14 and the bottom of the eccentric hole. 6 can be ensured, so that the supply of the lubricating oil to the rocking bearing 6 can be ensured, and the bearing load capacity can be sufficiently prevented from being reduced in combination with the one-piece contact prevention structure. A more reliable bearing structure without fear of seizure or the like can be obtained.
Although FIG. 8 shows an example in which the protrusion 15a is one, a plurality of protrusions 15a may be provided.
6 shows an example in which a centrifugal pump is used as the oil pump 16, a positive displacement oil pump may be used.
[0021]
Embodiment 3 FIG.
FIG. 9 shows the third embodiment. The rest of the overall compressor structure is the same as in FIG. In the figure, 12a is a small-diameter portion provided at the lower end portion of the swing shaft 12, 12b is a first recess formed by the peripheral small-diameter portion 12a and the outer peripheral portion of the engaging member 15, and 14b is a lower portion of the sleeve 14. It is the convex part provided in the inner periphery. The engagement member 15 is fixed to the swing shaft 12 by means of screws, welding, or the like, and the relationship between the notch 14a of the sleeve 14 and the protrusion 15a of the tilting member 15 is the same as that of the second embodiment. It is the same.
[0022]
Next, the operation will be described. The movement of the sleeve 14b in the axial direction is restricted between the swing shaft 12 and the engaging member 15 in the first recessed part 12b, so that the movement of the sleeve 14 is restricted in the axial direction.
As a result, the occurrence of abnormal vibration and abnormal sound due to the movement of the sleeve 14 in the axial direction during operation and startup is reduced.
[0023]
Embodiment 4 FIG.
Next, a fourth embodiment will be described with reference to FIG. In the figure, L1 is the axial length of the sleeve 14, L2 is the length of the rocking bearing 6, and L3 is an axial gap formed by the convex portion 14b of the sleeve inner peripheral portion and the first concave portion 12b. . The dimensional relationship among the axial length L1 of the sleeve 14, the length L2 of the rocking bearing 6 and the axial clearance L3 of the sleeve is set so that L1> L2, and the sleeve 14 is When the sleeve 14 moves in the axial direction within the axial gap L3 formed by the recess 12b, the upper and lower ends of the sleeve 14 do not wrap around the sliding surface of the rocking bearing. The rocking bearing 6 is a so-called bearing alloy made of a soft metal such as lead, tin, copper, or aluminum. The sleeve 14 is made of a material harder than the rocking bearing, such as a sintered material or steel.
[0024]
Next, the operation will be described. Since the dimensional relationships are set as described above, the upper and lower ends of the sleeve 14 may overlap the rocking bearing 6 when the sleeve 14 moves in the axial gap range. The occurrence of abnormal wear of the rocking bearing 6 can be prevented, and the reliability of the rocking bearing 6 is further improved.
FIG. 10 is a diagram showing a case where the lower end portion of the sleeve 14 and the rocking bearing 6 are overlapped regardless of the present embodiment. When the lower end of the sleeve 14 and the rocking bearing 6 overlap as shown in FIG. 10, the rocking bearing 6 made of soft metal is replaced with the sleeve 1 made of hard metal.
The problem of wear due to the axial movement of 4 arises.
[0025]
Embodiment 5 FIG.
11 and 12 show the fifth embodiment.
20 is a fastening member that fastens the engaging member 15 and the swing shaft 12, 15c is a second recess provided in the engaging member 15, and the circumferential small diameter portion 12a is fitted to the second recess 15c.
The rest of the overall compressor structure is the same as in FIG. 6 and the like, and the relationship between the notch 14a of the sleeve 14 and the protrusion 15a of the tilting member 15 is the same as in the second embodiment.
[0026]
Next, a method for assembling the main part of the compressor according to the present embodiment will be described.
After the sleeve 14 is fitted to the swing shaft 12, the engaging member 15 is fastened to the swing shaft 12 by the fastening member 20. At this time, the second concave portion 15c provided in the engaging member 15 is fitted to the circumferential small diameter portion 12a to position the engaging member 15 and the swing shaft 12.
Since it is configured as described above, the scroll shaft 12 and the engagement member 15 can be accurately positioned when the swing shaft 12, the sleeve 14 and the engagement member 15 are assembled. A compressor is obtained.
[0027]
Embodiment 6 FIG.
FIG. 13 shows the sixth embodiment.
Reference numeral 12c denotes a flat portion provided in the circular small-diameter portion 12a, 15c denotes a second recess, and 15d denotes a flat portion of the second recess 15c.
The rest of the overall compressor structure is the same as in FIG. 6 and the like, and the relationship between the notch 14a of the sleeve 14 and the protrusion 15a of the tilting member 15 is the same as in the second embodiment.
[0028]
Next, the operation will be described.
During operation of the compressor, a force is applied between the rocking bearing 6 and the sleeve 14 to rotate the sleeve 14 relative to the rocking shaft 12 by friction. This acting force is transmitted to the engaging member 15, and a torque for rotating the engaging member 15 with respect to the swing shaft 12 is generated. In the present embodiment, torque is transmitted between the flat portion 12c and the flat portion 15d. Therefore, it is not necessary to transmit torque with the fastening member 20, and problems such as loosening and breakage of the fastening member 20 do not occur. A high scroll compressor can be obtained.
[0029]
【The invention's effect】
As described above, in the scroll compressor according to the first aspect of the present invention, the swing shaft is fitted to the swing bearing through the sleeve, and the sleeve is moved by the engaging member. Are coupled so as to rotate together with the rocking shaft, and are rotatably fitted to the rocking shaft, corresponding to the central portion in the axial direction of the rocking bearing, and the outer surface of the rocking shaft or the rocking shaft. Corresponding to the axial center part of the dynamic bearing, the inner peripheral surface of the sleeve is provided with a belt-like convex part that is convex in the direction perpendicular to the axial direction over the entire circumference. However, the sleeve can be kept parallel to the rocking bearing, the bearing load capacity of the rocking bearing is not reduced, and a highly reliable scroll compressor without damage to the rocking bearing can be provided.
In addition, an oil reservoir in the lower part of the sealed container, an oil pump provided in the lower part of the crankshaft, an oil passage provided in the crankshaft and communicating with the eccentric hole and the oil pump, and provided in the rocking bearing A substantially disc-shaped engaging member having at least one protrusion is fixed to the lower end of the swing shaft, and a notch having a finite depth is formed at the lower end on the inner peripheral side of the sleeve. The sleeve and the pivot shaft are connected in the rotational direction with the projection and the notch, and the notch bottom portion of the sleeve is seated on the projection of the engaging member. Space can be secured and an oil supply path to the rocking bearing can be secured, so that the lubricating oil can be reliably supplied to the rocking bearing, and a single-layer bearing is combined with a belt-like portion protruding between the rocking shaft and the sleeve. A highly reliable scroll compressor can be obtained.
[0030]
The scroll compressor according to a second aspect of the present invention is the scroll compressor according to the first aspect of the present invention, wherein the lower end of the pivot shaft is provided with a small circumferential diameter portion smaller than the outer diameter of the circumferential portion of the engagement member, Since the concave portion is formed, the convex portion is provided on the inner peripheral portion of the sleeve, and is fitted with the first concave portion with a predetermined axial gap, the axial movement of the sleeve is restricted, and the second invention In addition to the above effect, vibration and noise due to the axial movement of the sleeve are reduced, and a scroll compressor with low noise and low vibration can be obtained.
[0031]
In the scroll compressor according to the third invention, in the second invention, the dimensional relationship between the axial length L1 of the sleeve and the oscillating bearing length L2 is set so that L1> L2, and the sleeve When the sleeve moves in the axial direction within the axial gap formed by the sleeve convex portion and the first concave portion, the sleeve end portion is prevented from lapping with the sliding surface of the rocking bearing. And the overlap between the end of the sleeve and the sliding surface of the rocking bearing is prevented, and in addition to the effects of the third invention, the abnormal wear of the rocking bearing can be prevented, and a more reliable scroll A compressor can be obtained.
[0032]
According to a fourth aspect of the present invention, there is provided the scroll compressor according to the second or third aspect , wherein the second portion is connected to a fastening portion between the fastening shaft that fastens the swing shaft and the engagement member, and the swing shaft of the engagement member. Since the small-diameter portion at the end of the rocking shaft and the second concave portion are fitted, the small-diameter portion of the rocking member is engaged when the rocking shaft, the sleeve and the engaging member are assembled. Positioning can be performed by fitting in the second recess of the member, and a scroll compressor with good assemblability can be obtained.
[0033]
The scroll compressor according to a fifth aspect of the present invention is the scroll compressor according to the fourth aspect , wherein at least one flat portion is provided in the small-circular diameter portion at the end of the pivot shaft, and the small-circular diameter is provided in the second recess of the engaging member. Since the flat part corresponding to the flat part of the part is provided, the torque acting on the engaging member is transmitted by the flat part of the end of the swing shaft, so that there is no loosening or breakage of the fastening member and highly reliable scroll compression A machine is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a compressor according to Embodiment 1 of the present invention.
FIG. 2 is a perspective view of a sleeve according to Embodiment 1 of the present invention.
FIG. 3 is a cross-sectional view of the main part of the compressor for explaining the operation of the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of a main part of another compressor according to the first embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part of still another compressor according to the first embodiment of the present invention.
FIG. 6 is a cross-sectional view of a compressor according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view of a main part of a compressor according to a second embodiment of the present invention.
FIG. 8 is a main part drawing of a compressor according to a second embodiment of the present invention.
FIG. 9 is a cross-sectional view of a main part of a compressor according to third and fourth embodiments of the present invention.
FIG. 10 is a cross-sectional view of a main part of a compressor for explaining an operation of a fourth embodiment of the present invention.
FIG. 11 is a cross-sectional view of a main part of a compressor according to a fifth embodiment of the present invention.
FIG. 12 is a cross-sectional view of a main part of a compressor according to a fifth embodiment of the present invention.
FIG. 13 is a cross-sectional view of a main part of a compressor according to a sixth embodiment of the present invention.
FIG. 14 is a compressor cross-sectional view showing a conventional scroll compressor.
FIG. 15 is a cross-sectional view of a compressor showing the operation of a conventional scroll compressor.
FIG. 16 is a cross-sectional view of a compressor showing the operation of a conventional scroll compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Swing scroll 3, 4 Frame, 5 Fixed scroll, 6 Swing bearing, 7, 11 Bearing, 8 Airtight container, 9 Electric motor (rotor), 10 Crankshaft, 10a Eccentric hole part, 12 Swing Moving shaft, 12a orbiting small diameter portion, 12b first concave portion, 12c flat portion, 13 strip-shaped convex portion, 14 sleeve, 14a notch, 14b sleeve convex portion, 15 engaging member, 15a projection, 15c first Second concave portion, 15d flat portion, 16 oil pump, 17 oil sump, 18 oil passage, 20 fastening member.

Claims (5)

A sealed container;
A fixed scroll with a spiral wrap;
An oscillating scroll in which a spiral wrap is erected and compresses a fluid in combination with the spiral wrap of the fixed scroll;
A pivot shaft provided on the opposite side of the spiral wrap of Le, - said oscillating scroll
A crankshaft rotated by an electric motor;
And beam, - frame provided with a bearing for rotatably supporting the crankshaft
An eccentric hole provided on one end of the crankshaft,
A swing bearing formed on the inner peripheral surface of the eccentric hole section,
A sump of lubricating oil at the bottom of the sealed container;
An oil pump provided at a lower portion of the crankshaft;
An oil passage provided inside the crankshaft and communicating the eccentric hole and the oil pump;
An oil groove provided in the rocking bearing;
Bei to give a,
Scan Li said rocking shaft to the swing bearing - fitted through blanking,
The sleeve is coupled to rotate integrally with the swing shaft by an engaging member, and is rotatably fitted to the swing shaft.
Corresponding to the axial center part of the rocking bearing, corresponding to the outer peripheral surface of the rocking shaft, or the axial center part of the rocking bearing, and axially extending over the inner peripheral surface of the sleeve. Provide a belt-like convex part that is convex in the vertical direction,
A substantially disc-shaped engaging member having at least one protrusion is fixed to the lower end of the swing shaft, and a notch with a finite depth is provided at the lower end on the inner peripheral side of the sleeve. The sleeve and the swing shaft are connected in the rotational direction with the notch, and the notch bottom portion of the sleeve is seated on the protrusion of the engaging member. Scroll compressor. Provided at the lower end of the swinging shaft is a small-diameter portion of the circumference smaller than the outer diameter of the circumferential portion of the engaging member. Together with the engaging member, a first concave portion is formed, and a convex portion is provided on the inner peripheral portion of the sleeve. 2. The scroll compressor according to claim 1 , wherein the scroll compressor is fitted to the first recess with a predetermined axial gap. The dimensional relationship between the axial length L1 of the sleeve and the oscillating bearing length L2 is set so that L1> L2, and the sleeve is positioned within the axial clearance formed by the sleeve convex portion and the first concave portion. 3. The scroll compressor according to claim 2 , wherein the end of the sleeve does not wrap with the sliding surface of the rocking bearing when moved in the direction. A fastening member for fastening the pivot shaft and engaging member, wherein the second concave portion is provided on the fastening portion of the pivot shaft, wherein a circumferential small diameter portion of the pivot shaft end second concave portion of the engaging member The scroll compressor according to any one of claims 2 and 3, wherein the scroll compressor is fitted. The flat portion corresponding to the flat portion of the small-circumferential diameter portion is provided in the second concave portion of the engaging member, and at least one flat portion is provided in the small-circular diameter portion of the swing shaft end. 4. The scroll compressor according to 4 .

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