JP4510136B2 - Scroll type fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll fluid machine suitably used as an air compressor, for example.
[0002]
[Prior art]
In general, a scroll type fluid machine includes a casing, a fixed scroll provided on the casing and having a spiral wrap portion standing on an end plate, a drive shaft rotatably provided on the casing, and a casing in the casing. There is known a revolving scroll provided on the front end side of the drive shaft so as to be able to turn, and having a wrap portion standing on the end plate so as to overlap the wrap portion of the fixed scroll and defining a plurality of compression chambers. .
[0003]
This type of conventional scroll type fluid machine has a suction port provided on the outer peripheral side of the fixed scroll by rotationally driving the drive shaft from the outside and rotating the orbiting scroll with a fixed eccentric dimension with respect to the fixed scroll. The fluid is sucked in from the air, and the fluid is sequentially compressed in each compression chamber between the fixed scroll wrap portion and the orbiting scroll wrap portion, and the compressed fluid is discharged from the discharge port provided in the center portion of the fixed scroll. Discharge toward
[0004]
As another prior art, there is a method in which a turning scroll is fixedly provided at both ends of the drive shaft in order to increase the amount of compressed air, and a pair of fixed scrolls are arranged opposite to each turning scroll. Yes.
[0005]
[Problems to be solved by the invention]
By the way, the scroll type fluid machine according to the other prior art described above has a configuration in which a turning scroll is fixedly provided at both ends of the drive shaft and a pair of fixed scrolls are arranged to face each of the turning scrolls. The thrust load acting on one orbiting scroll and the thrust load acting on the other orbiting scroll can be offset and supported by the drive shaft in the axial direction.
[0006]
However, in this prior art, the orbiting scroll is arranged so as to protrude greatly from the end side of the drive shaft to the outside in the radial direction, so that the thrust load acting on the orbiting scroll can be stabilized with only the drive shaft. It is difficult to support. As a result, when the orbiting scroll is revolving, the orbiting scroll moves so as to swing around on the end side of the drive shaft, and there is a problem that the wrap portion of the orbiting scroll may interfere with the wrap portion of the fixed scroll and generate noise. .
[0007]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to stably support the orbiting scroll on the end side of the orbiting shaft, stabilize the behavior of the orbiting scroll, An object of the present invention is to provide a scroll type fluid machine capable of reducing noise.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a scroll type fluid machine according to the invention of claim 1 is provided with a casing and a fixed lap portion on the casing, which is positioned on an axis of the casing, and a spiral lap portion is erected on the end plate. A fixed-side member comprising a fixed scroll, and an electric motor provided in the casing so as to be axially spaced from the fixed scroll, the rotor and the stator being arranged in the same direction as the axis of the casing; An eccentric bearing having an outer rolling element centered about the axis of the casing and an inner rolling element arranged inside the outer rolling element and rolling about an eccentric axis that is eccentric to the axis of the casing; and the electric motor The both ends of the casing extend in the axial direction of the casing, and both ends are formed of hollow shaft bodies supported by the outer rolling elements of the eccentric bearing. A rotary shaft which is rotated, is provided loosely fitted the rotation in the shaft on the eccentric axis, a pivot axis for pivoting movement and is supported by the inner rolling element of the eccentric bearing, A bolt insertion hole, and by inserting a fixing bolt into the bolt insertion hole, On the end side of the swivel axis In a detent state with respect to the pivot axis A fixed thrust receiving plate; in front Facing the fixed scroll Provided, A revolving scroll in which a wrap portion that overlaps with a wrap portion of the fixed scroll and defines a plurality of compression chambers is provided on an end plate, and a rotation prevention mechanism that prevents rotation of the revolving scroll. The rear side of the end plate of the orbiting scroll is fixed to the thrust receiving plate. ing.
[0009]
With this configuration, when the electric motor is operated and the rotor is rotated, the rotation causes the rotating shaft to rotate while being supported by the outer rolling element of the eccentric bearing. Rolls around an eccentric axis that is eccentric with respect to the axis. Thereby, the turning shaft supported by the inner rolling element performs a turning motion in a state in which the rotation is prevented by the rotation prevention mechanism.
[0010]
And the orbiting scroll The back side of the end plate On the end side of the swivel axis In a non-rotating state via bolt insertion holes and fixing bolts Since the thrust receiving plate is fixed to the provided thrust receiving plate, the thrust receiving plate can be brought into contact with the rear surface of the orbiting scroll with a large area, and the thrust load acting on the orbiting scroll can be stably supported by the thrust receiving plate. can do.
[0011]
According to a second aspect of the present invention, the thrust receiving plate is formed with an outer diameter larger than that of the orbiting shaft, the disc portion on which the end plate of the orbiting scroll is abutted and attached to the surface side, and the center on the back side of the disc portion It is comprised by the fitting part formed by fitting to the end part side of a rotating shaft.
[0012]
Thereby, the thrust receiving plate can be stably attached to the turning shaft in a state where the fitting portion is fitted to the end of the turning shaft. Further, the orbiting scroll can be firmly attached to the thrust receiving plate in a state where the rear surface of the end plate is abutted against the thrust receiving plate.
[0013]
Furthermore, the invention of claim 3 is characterized in that the rotation prevention mechanism is a crankshaft having a first side shaft portion rotatably supported on the casing side and a second side shaft portion rotatably supported on the thrust receiving plate side. It is composed.
[0014]
As a result, the rotation of the orbiting scroll can be prevented by rotating the one side shaft portion and the other side shaft portion of the crankshaft relative to the casing and the thrust receiving plate during the compression operation.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a scroll type air compressor will be described as an example of a scroll type fluid machine according to an embodiment of the present invention and will be described in detail with reference to the accompanying drawings.
[0016]
1 to 7 show an embodiment of the present invention. Reference numeral 1 denotes a cylindrical casing which forms an outer frame of a scroll type air compressor and constitutes a fixed side member together with fixed scrolls 6A and 6B described later. The casing 1 is provided with a cylindrical portion 2 having an axis O1-O1 (see FIG. 2), and fixed to bearing mounting cylinders 4A and 4B, which will be described later, located on both ends of the cylindrical portion 2. It is comprised by the bottomed cylindrical lid parts 3A and 3B. Further, openings 3A1 and 3B1 are formed on the outer peripheral sides of the lid portions 3A and 3B at positions communicating with suction ports 40A and 40B described later.
[0017]
Reference numerals 4A and 4B denote first and second bearing mounting cylinders that are provided between the cylindrical portion 2 and the lid portions 3A and 3B, respectively, and constitute a part of the casing 1. The outer peripheral side of 4A is fixed and attached to the cylindrical portion 2 together with the lid portion 3A by a bolt 5A, and an eccentric bearing 16A described later is attached to the inner peripheral side thereof.
[0018]
The bearing mounting cylinder 4A is provided with two receiving holes 4A1 (only one is shown) located on the side facing the thrust receiving plate 26A described later. The accommodation hole 4A1 is disposed at a position substantially corresponding to the accommodation hole 27A2 of the thrust receiving plate 26A, and a bearing 38 (described later) is accommodated therein.
[0019]
Further, the second bearing mounting cylinder 4B is configured in the same manner, and is fixedly attached to the cylinder part 2 together with the lid part 3B by a bolt 5B.
[0020]
Reference numerals 6A and 6B denote first and second fixed scrolls which are located on both sides in the axial direction of the casing 1 and are movably provided on the inner peripheral side of the cylindrical portion 2. The first fixed scroll 6A is substantially circular. The end plate 7A is formed in a plate shape and is arranged so that the center thereof coincides with the axis O1-O1 of the casing 1, the spiral wrap portion 8A standing on the surface of the end plate 7A, and the outer peripheral side of the end plate 7A Projecting in the axial direction so as to surround the wrap portion 8A, and is configured by a fitting cylinder portion 9A that is fitted to the inner peripheral side of the cylinder portion 2 and is movably provided in the axial direction. A plurality of pin holes 10A (only two are shown) are recessed in the axial direction and spaced apart in the circumferential direction on the back side of the end plate 7A.
[0021]
Further, the second fixed scroll 6B is also constituted by the end plate 7B, the recess 7B1, the wrap portion 8B, the fitting cylinder portion 9B, and the pin hole 10B.
[0022]
Reference numerals 11A and 11B denote a plurality of guide pins (only two are shown) protruding from the lid portions 3A and 3B of the casing 1 toward the fixed scrolls 6A and 6B. One guide pin 11A has a base end side on the casing 1. The front end side is slidably inserted into the pin hole 10A of the fixed scroll 6A.
[0023]
And this guide pin 11A becomes a structure which guides the fixed scroll 6A to an axial direction while hold | maintaining the fixed scroll 6A with respect to the casing 1 in the rotation stop state. Further, the other guide pin 11B is configured in the same manner as the guide pin 11A.
[0024]
Reference numerals 12A and 12B denote first and second pressure chambers respectively provided between the lid portions 3A and 3B of the casing 1 and the rear surfaces of the end plates 7A and 7B of the fixed scrolls 6A and 6B. Guides an intermediate pressure in a compression chamber 36A, which will be described later, to the back side of the end plate 7A through a communication hole (not shown) provided in the end plate 7A, and this intermediate pressure causes the fixed scroll 6A to move toward the orbiting scroll 30A in the axial direction. To increase the sealing degree in the compression chamber 36A. Further, the second pressure chamber 12B is configured in the same manner as the pressure chamber 12A.
[0025]
An electric motor 13 is provided between the fixed scrolls 6A and 6B and is provided in an intermediate portion of the casing 1. The electric motor 13 includes a stator 14 fixedly provided on the inner peripheral side of the casing 1, and the stator 14 The rotor 14 is arranged on the inner peripheral side of the rotor 14 so as to be rotated by the stator 14. The axis of the stator 14 and the axis of the rotor 15 are arranged on the same axis as the axis O 1 -O 1 of the casing 1. . The electric motor 13 drives a rotating shaft 23 described later by rotating the rotor 15.
[0026]
Reference numerals 16A and 16B denote first and second eccentric bearings which are located between the fixed scrolls 6A and 6B and the electric motor 13 and are provided on the inner peripheral side of the bearing mounting cylinders 4A and 4B, respectively. 16A is rotatably provided by an outer ring 17A, a plurality of spherical bodies 18A serving as outer rolling elements on the inner peripheral side of the outer ring 17A, an outer middle ring 19A fixed to the outer peripheral side of the rotary shaft 23, and the rotary shaft 23. The inner ring 20A is fixed to the inner circumferential side of the inner ring 20A, and the inner ring 22A is rotatably provided on the inner circumferential side of the inner middle ring 20A by a plurality of spheres 21A serving as inner rolling elements.
[0027]
Here, the outer ring 17A is press-fitted and mounted on the inner peripheral side of the bearing mounting cylinder 4A, and is disposed on the axis O1-O1. Further, the outer middle ring 19A is positioned on the inner peripheral side of the outer ring 17A by the spherical body 18A, and is disposed on the axis O1-O1. In this state, the sphere 18A rolls between the outer ring 17A and the outer middle ring 19A around the axis O1-O1.
[0028]
On the other hand, the inner inner ring 20A is disposed on an eccentric axis O2-O2 that is eccentric in the radial direction by a fixed dimension δ with respect to the axis O1-O1 of the outer ring 17A. Further, the inner ring 22A is positioned on the inner peripheral side of the inner inner ring 20A by the spherical body 21A, and is disposed on the eccentric axis O2 -O2. In this state, the sphere 21A rolls around the eccentric axis O2-O2.
[0029]
Thus, in the eccentric bearing 16A, the outer middle ring 19A and the inner middle ring 20A rotate integrally with the rotary shaft 23, so that the inner ring 22A integrated with the turning shaft 24 has a dimension δ about the axis O1-O1. A turning motion with a turning radius is performed.
[0030]
Further, the second eccentric bearing 16B is also composed of an outer ring 17B, a sphere 18B, an outer middle ring 19B, an inner middle ring 20B, a sphere 21B, and an inner ring 22B.
[0031]
Reference numeral 23 denotes a rotating shaft provided on both ends of the eccentric bearings 16A and 16B with the rotor 15 of the electric motor 13 interposed therebetween. The rotating shaft 23 is formed as a hollow shaft body and is inserted into the inner peripheral side of the rotor 15 of the electric motor 13. And fixedly provided. The rotating shaft 23 is fixedly attached to both the inner circumferential side of the outer middle wheel 19A and the outer circumferential side of the inner middle wheel 20A. The rotating shaft 23 rotates integrally with the rotor 15 to rotate with the outer middle wheel 19A. The inner middle wheel 20A is rotated.
[0032]
Here, as shown in FIG. 2, the rotating shaft 23 has a thickness d1 on the side opposite to the eccentric axis O2-O2 across the axis O1-O1, and a thickness on the eccentric axis O2-O2 side. If d is the dimension d2, the relationship d1> d2 is set. For this reason, the rotating shaft 23 is arranged on the axis O1-O1 of the outer ring 17A, 17B on the outer peripheral side, whereas the eccentric shaft line eccentric on the inner peripheral side by a fixed dimension δ in the radial direction with respect to the axis O1-O1. Arranged on O2 -O2.
[0033]
24 is a swing shaft provided loosely in the rotary shaft 23 and fixedly supported by the inner rings 22A and 22B of the eccentric bearings 16A and 16B. The swing shaft 24 is formed as a solid cylindrical body, It is arranged on the eccentric axis O2 -O2. Further, both ends of the turning shaft 24 are fixedly inserted into the inner peripheral sides of the inner rings 22A and 22B.
[0034]
Here, on both end surfaces of the turning shaft 24, bottomed mounting holes 25A and 25B each having a circular hole to which the thrust receiving plate 26A is mounted are provided. Then, screw holes 25A1, 25B1 are formed at positions substantially corresponding to the axis O1-O1 on the bottom side of the mounting holes 25A, 25B. The orbiting shaft 24 orbits integrally with the inner rings 22A and 22B by the rotation of the rotating shaft 23, thereby causing the orbiting scrolls 30A and 30B to orbit integrally with the thrust receiving plates 26A and 26B.
[0035]
Reference numeral 26A denotes a first thrust receiving plate that is positioned on the rear side of the end plate 31A of the orbiting scroll 30A, which will be described later, and is fixed to one end of the orbiting shaft 24. The first thrust receiving plate 26A is an orbiting shaft. A disc portion 27A formed with an outer diameter larger than 24, and a fitting projection 28A as a fitting portion having a stepped cylindrical shape protruding from the center of the back side of the disc portion 27A. ing.
[0036]
Further, arc-shaped protrusions 27A1 and 27A1 that are spaced apart in the circumferential direction and protrude in the radial direction are provided on the outer peripheral side of the disk part 27A of the thrust receiving plate 26A. The arcuate protrusion 27A1 is provided with another receiving hole 27A2 consisting of a bottomed circular hole at a position substantially corresponding to the receiving hole 4A1 of the bearing mounting cylinder 4A. A bearing 39 is accommodated.
[0037]
Further, a bolt insertion hole 26A1 is formed in the thrust receiving plate 26A at a position substantially corresponding to the eccentric axis O2-O2. Then, the thrust receiving plate 26A fits the fitting projection 28A into the mounting hole 25A of the turning shaft 24, and in this state, the fixing bolt 29A is inserted into the bolt insertion hole 26A1 from the surface side of the disc portion 27A. As a result, the rotating shaft 24 is fastened integrally with the rotating shaft 24. Further, the thrust receiving plate 26A supports the thrust load F1 (see FIG. 1) acting on the orbiting scroll 30A on the end side of the orbiting shaft 24 by contacting the rear surface side of the end plate 31A of the orbiting scroll 30A. .
[0038]
26B is a second thrust receiving plate that is positioned on the rear side of the end plate 31B of the orbiting scroll 30B and is fixed to the other end side of the orbiting shaft 24. The thrust receiving plate 26B is also connected to the thrust receiving plate 26A. It is configured in substantially the same manner, and has a bolt insertion hole 26B1, a disc portion 27B, and a fitting projection 28B. Then, the thrust receiving plate 26B is fastened in the mounting hole 25B of the orbiting shaft 24 by a fixing bolt 29B, and abuts against the rear side of the end plate 31B of the orbiting scroll 30B, thereby acting on the orbiting scroll 30B on the end side of the orbiting shaft 24. It supports the thrust load F2 (refer to FIG. 1). Here, the thrust receiving plate 26B has no arcuate protrusion 27A1 provided on the thrust receiving plate 26A.
[0039]
Reference numerals 30A and 30B denote first and second orbiting scrolls which are fixedly provided on both ends of the orbiting shaft 24 so as to face the fixed scrolls 6A and 6B. The first orbiting scroll 30A is a disc. The end plate 31A is formed in a shape, and the spiral wrap portion 32A is provided in the axial direction from the surface side of the end plate 31A.
[0040]
Further, the end plate 31A of the orbiting scroll 30A is integrally formed with an annular protrusion 33A extending in a substantially “C” shape along the circumferential direction on the back side thereof. Further, as shown in FIG. 6, the end plate 31A is formed with a plurality of cooling air passages 34A, 34A,...
[0041]
The orbiting scroll 30A is positioned in the radial direction with respect to the thrust receiving plate 26A by fitting the annular protrusion 33A to the outer peripheral side of the thrust receiving plate 26A. Further, the orbiting scroll 30A makes the thrust plate by inserting the plurality of fixing bolts 35A (see FIGS. 3 and 6) from the surface side of the end plate 31A by bringing the back side of the end plate 31A into contact with the thrust receiving plate 26A. It is integrally attached to the receiving plate 26A.
[0042]
Thereby, the orbiting scroll 30A is integrated with the orbiting shaft 24 and performs the orbiting motion having the orbiting radius of the dimension δ. The wrap portion 32A of the orbiting scroll 30A is disposed so as to overlap with the wrap portion 8A of the fixed scroll 6A by, for example, 180 degrees, and a plurality of compression chambers 36A, 36A are provided between the wrap portions 8A, 32A. , ... are defined.
[0043]
During the operation of the scroll type air compressor, air is sucked into a compression chamber 36A on the outer peripheral side from a suction port 40A, which will be described later, and this air is sequentially compressed in each compression chamber 36A while the orbiting scroll 30A is swirling. Finally, compressed air is discharged from the compression chamber 36A on the center side to the outside via a discharge port 41A described later.
[0044]
Further, the second orbiting scroll 30B is also configured by an end plate 31B, a lap portion 32B, an annular protrusion 33B, a cooling air passage 34B, and the like. The orbiting scroll 30B is integrally attached to the thrust receiving plate 26B by a fixing bolt 35B, and a plurality of compression chambers 36B are defined between the rotating scroll 30B and the fixed scroll 6B. Here, the orbiting scroll 30B is different from the orbiting scroll 30A in that the annular protrusion 33B is formed in an annular shape as shown in FIG.
[0045]
Reference numerals 37 and 37 denote crankshafts provided as a rotation prevention mechanism provided between the bearing mounting cylinder 4A and the thrust receiving plate 26A. The crankshaft 37 is disposed in the receiving hole 4A1 of the bearing mounting cylinder 4A as shown in FIG. The first shaft portion 37A is rotatably supported by the bearing 38, and the other shaft portion 37B is rotatably supported by the bearing 39 in the receiving hole 27A2 of the thrust receiving plate 26A. The crankshaft 37 is arranged such that the other side shaft portion 37B is eccentric with respect to the one side shaft portion 37A by a dimension δ, and these shaft portions 37A, 37B are relatively rotated in the receiving holes 4A1, 27A2 during operation. The rotation of the orbiting scroll 30A integrated with the thrust receiving plate 26A is prevented.
[0046]
40A and 40A are suction ports provided in the cylindrical portion 2 of the casing 1 and located on the outer peripheral side of the wrap portions 8A and 8B of the fixed scrolls 6A and 6B, and 41A and 41B are wrap portions 8A of the fixed scrolls 6A and 6B. The discharge port provided in cover part 3A, 3B of the casing 1 located in the 8B center side is shown. Further, 42, 42,... Are a plurality of radiating fins provided on the outer peripheral side of the cylindrical portion 2 of the casing 1 at intervals in the axial direction.
[0047]
The scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
[0048]
First, when the rotor 15 of the electric motor 13 is rotated, the rotating shaft 23 integrated with the rotor 15 is rotated by the spheres 18A and 18B of the eccentric bearings 16A and 16B. It rotates on the inner peripheral side of the rotating shaft 23 by 21B.
[0049]
Here, the spheres 16A, 16B rotate around the axis O1-O1 of the casing 1 (outer rings 17A, 17B), whereas the spheres 21A, 21B have a dimension δ in the radial direction with respect to the axis O1-O1. Therefore, the turning shaft 24 integrated with the inner rings 22A and 22B by the spherical bodies 21A and 21B has a turning radius of the dimension δ around the axis O1 -O1. Movement is performed, and the orbiting scrolls 30A and 30B are orbited by the orbiting shaft 24, respectively.
[0050]
When the orbiting scrolls 30A and 30B are orbited in this way, the orbiting scrolls 30A and 30B are prevented from rotating by the crankshaft 37 and only revolve.
[0051]
As a result, the compression chambers 36A defined between the fixed scroll 6A and the orbiting scroll 30A are continuously reduced, and thereby the outside air sucked from the suction port 40A of the fixed scroll 6A is sequentially supplied to the compression chambers 36A. While compressing this compressed air, the fixed scroll 6A Discharge port 41 A is stored in an external air tank (not shown) or the like.
[0052]
Further, each compressed chamber 36B defined between the fixed scroll 6B and the orbiting scroll 30B is also continuously reduced to store the compressed air in the air tank or the like.
[0053]
Here, in the present embodiment, thrust receiving plates 26A and 26B having an outer diameter larger than that of the turning shaft 24 are fixed to both ends of the turning shaft 24, and the orbiting scroll is provided on the thrust receiving plates 26A and 26B. 30A and 30B are fixed and attached.
[0054]
For this reason, the thrust receiving plates 26A, 26B can be brought into contact with the end plates 31A, 31B of the orbiting scrolls 30A, 30B from the back side with a wide contact area, and the thrust loads F1, F1 acting on the orbiting scrolls 30A, 30B, F2 can be dispersed and supported throughout the disk portions 27A and 27B of the thrust receiving plates 26A and 26B.
[0055]
Thus, in the present embodiment, the behavior of the orbiting scrolls 30A and 30B can be stabilized, and the wrap portions 32A and 32B of the orbiting scrolls 30A and 30B are wrapped with the fixed scrolls 6A and 6B as described in the prior art. Interference with the portions 8A and 8B is eliminated, wear of the wrap portions 8A, 8B, 32A and 32B can be prevented, noise can be reduced, and the performance and reliability of the air compressor can be improved.
[0056]
By the way, in order to prevent rotation of the orbiting scroll 30A, for example, when an Oldham ring is provided between the bearing mounting cylinder 4A and the thrust receiving plate 26A, the Oldham ring, the bearing mounting cylinder 4A, the thrust receiving plate 26A, In the meantime, rattling occurs due to processing reasons and the like, so that the orbiting scroll vibrates due to such rattling and causes noise.
[0057]
Therefore, in the present embodiment, in order to prevent rotation of the orbiting scroll 30A, one side shaft portion 37A of the crankshaft 37 is rotatably provided in the housing hole 4A1 of the bearing mounting cylinder 4A via the bearing 38. Since the side shaft portion 37B is rotatably provided in the receiving hole 27A2 of the thrust receiving plate 26A via the bearing 39, the bearing 38, 39 prevents the crankshaft 37 from rattling in the receiving holes 4A1, 27A2. The behavior of the orbiting scrolls 30A and 30B can be further stabilized.
[0058]
In the embodiment, the case where the middle wheel used for the eccentric bearing 16A is composed of the two members of the outer middle wheel 19A and the inner middle wheel 20A has been described as an example, but instead of this, for example, FIG. As shown in the first modified example, the eccentric bearing 51A may be formed by integrating the outer middle ring 19A and the inner middle ring 20A according to the embodiment with each other, so that the middle ring 54A is constituted by one member. .
[0059]
Here, the eccentric bearing 51A is provided with an outer ring 52A and an inner ring 54A that is rotatably provided on the inner peripheral side of the outer ring 52A by a spherical body 53A that is an outer rolling element and is fitted and fixed to the end of the rotary shaft 23. And an inner ring 56A which is rotatably provided by a spherical body 55A serving as an inner rolling element on the inner peripheral side of the middle ring 54A and is fixed to the outer peripheral side of the turning shaft 24.
[0060]
Further, in the embodiment, the case where the arc-shaped protrusion 27A1 is provided on the outer peripheral side of the disk portion 27A of the thrust receiving plate 26A and the accommodation hole 27A2 is provided in the arc-shaped protrusion 27A1 has been described as an example. Instead of the arc-shaped protrusion 27A1 according to the embodiment from the disc portion 27A 'of the thrust receiving plate 26A', for example, as in the second modification shown in FIG. 9, the disc portion 27A 'is replaced with the disc portion 27A'. The disc portion 27A according to the embodiment may be formed to have a larger diameter, and the disc portion 27A 'may be provided with receiving holes 27A2' and 27A2 '.
[0061]
Here, the thrust receiving plate 26A 'has a bolt insertion hole 26A1', a disc portion 27A ', a receiving hole 27A2', and a fitting projection 28A 'in substantially the same manner as the thrust receiving plate 26A according to the embodiment. Yes.
[0062]
In the embodiment, two orbiting scrolls 30A and 30B are provided on both ends of the orbiting shaft 24, and the two orbiting scrolls 30A and 30B are disposed on both sides of the casing 1, respectively. Although the description has been given by taking the opposed scroll air compressor disposed as an example, the present invention is not limited to this. For example, the fixed scroll 6A and the orbiting scroll 30A are abolished, and the fixed scroll 6B and the orbiting scroll are eliminated. You may comprise a scroll type air compressor only by 30B.
[0063]
In the embodiment, the fitting protrusions 28A and 28B protruding from the thrust receiving plates 26A and 26B are fitted into the mounting holes 25A and 25B recessed at both ends of the turning shaft 24. Although described as an example, instead of this, for example, mounting holes are recessed on the thrust receiving plate side, fitting protrusions are protruded on both ends of the turning shaft, and the fitting protrusions are used as mounting holes. It is good also as a structure which attaches a thrust receiving plate to a turning axis | shaft by making it fit.
[0064]
Furthermore, in the embodiment, the scroll type air compressor has been described as an example of the scroll type fluid machine. However, the present invention is not limited to this, and can be widely applied to, for example, a refrigerant compressor.
[0065]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the rotating shaft is supported by the outer rolling element of the eccentric bearing in the casing of the stationary member, and the swivel shaft is disposed in the rotating shaft. And a thrust receiving plate on the end of the swivel shaft. In a non-rotating state via bolt insertion holes and fixing bolts This thrust receiving plate is fixed and the orbiting scroll is opposed to the fixed scroll. Back side of the panel Since the thrust receiving plate can be brought into contact with the back surface of the end plate of the orbiting scroll with a wide area, the thrust load acting on the orbiting scroll can be received by the thrust receiving plate. of It can be dispersed and supported throughout.
[0066]
As a result, the behavior of the orbiting scroll can be stabilized, and the wrap portion of the orbiting scroll does not interfere with the wrap portion of the fixed scroll as described in the prior art, and wear of these wrap portions can be prevented, Noise can be reduced and the performance and reliability of the fluid machine can be improved.
[0067]
In the invention of claim 2, the disc portion of the thrust receiving plate is formed with an outer diameter larger than the orbiting shaft, and the end plate of the orbiting scroll is abutted and attached to the surface side of the disc portion. The orbiting scroll can be firmly attached to the disc portion of the thrust receiving plate using a bolt or the like, and the behavior of the orbiting scroll can be further stabilized.
[0068]
Further, in the invention of claim 3, since the rotation preventing mechanism is constituted by a crankshaft rotatably supported between the casing and the thrust receiving plate, the crankshaft is interposed between the casing and the thrust receiving plate during turning. It is possible to prevent rattling, suppress vibration of the orbiting scroll, and further stabilize the behavior of the orbiting scroll.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to an embodiment of the present invention.
2 is a partially enlarged cross-sectional view showing an enlarged view of a fixed scroll, a turning scroll, an eccentric bearing, a thrust receiving plate and the like in FIG. 1;
3 is a cross-sectional view of the first thrust receiving plate, the crankshaft, and the like when viewed from the direction of arrows III-III in FIG.
4 is a rear view of the first thrust receiving plate in FIG. 1 as viewed from the rear side.
5 is a cross-sectional view of the second thrust receiving plate and the like viewed from the direction of arrows VV in FIG.
6 is a cross-sectional view of the first orbiting scroll, the cooling air passage, and the like when viewed from the direction of arrows VI-VI in FIG. 1;
7 is an exploded cross-sectional view showing the orbiting shaft, the first thrust receiving plate, and the first orbiting scroll in FIG. 1 in an exploded manner. FIG.
8 is a cross-sectional view of the fixed scroll, the orbiting scroll, the eccentric bearing, the thrust receiving plate, and the like according to the first modification of the present invention as seen from the same position as FIG.
FIG. 9 is a rear view of a first thrust receiving plate according to a second modification of the present invention as seen from the rear side.
[Explanation of symbols]
1 Casing (fixed side member)
4A, 4B Bearing mounting cylinder
6A, 6B fixed scroll
7A, 7B, 31A, 31B End plate
8A, 8B, 32A, 32B Wrap
13 Electric motor
14 Stator
15 rotor
16A, 16B, 51A Eccentric bearing
18A, 18B, 53A Sphere (outer rolling element)
21A, 21B, 55A Sphere (inner rolling element)
23 Rotating shaft
24 Rotating axis
26A, 26A ', 26B Thrust receiving plate
27A, 27A ', 27B Disc part
28A, 28A ', 28B Fitting protrusion (fitting part)
30A, 30B orbiting scroll
36A, 36B compression chamber
37 crankshaft
37A One side shaft
37B Other side shaft
F1, F2 thrust force

Claims (3)

A fixed-side member comprising a casing and a fixed scroll provided on the casing and fixed on the casing and having a spiral wrap portion standing on the end plate;
An electric motor which is provided in the casing so as to be axially separated from the fixed scroll, and is arranged so that the rotor and the stator are in the same direction as the axis of the casing;
An eccentric bearing having an outer rolling element centered on the axis of the casing and an inner rolling element that is arranged inside the outer rolling element and rolls about an eccentric axis that is eccentric with respect to the axis of the casing;
A rotating shaft that extends in the axial direction of the casing across the rotor of the electric motor and that is formed of a hollow shaft body that is supported by outer rolling elements of the eccentric bearing and is rotated by the rotor;
A revolving shaft that is freely fitted on the eccentric axis within the rotating shaft and is supported by an inner rolling element of the eccentric bearing to revolve.
Has a bolt insertion hole, by plugged the fixing bolt to the bolt insertion hole, and a thrust receiving plate provided fixedly around latched condition with respect to the pivot shaft on the end side of the pivot axis,
Provided to face the front Symbol fixed scroll, and the orbiting scroll wrap portion is erected to overlap with the lap portion of the fixed scroll end plate defining a plurality of compression chambers,
A rotation prevention mechanism for preventing rotation of the orbiting scroll ,
The back side of the end plate of the orbiting scroll, the scroll type fluid machine comprising a structure provided by fixing to the said thrust receiving plate.   The thrust receiving plate is formed with an outer diameter larger than that of the orbiting shaft and is formed on the front side of the disc portion on which the end plate of the orbiting scroll is abutted and attached at the center of the rear surface side of the disc portion. The scroll fluid machine according to claim 1, wherein the scroll fluid machine is configured by a fitting portion fitted and attached to an end portion side of the shaft.   The said rotation prevention mechanism is comprised by the crankshaft which has the one side axial part rotatably supported by the said casing side, and the other side axial part rotatably supported by the said thrust receiving plate side. The scroll fluid machine according to 2.

Images