JP4302851B2 - Scroll type fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll fluid machine suitable for use in, for example, an air compressor or a vacuum pump.
[0002]
[Prior art]
In general, a scroll type fluid machine used for a scroll type air compressor or the like includes a casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing, and a tip end side of the drive shaft. A revolving scroll that is provided so as to be pivotable and defines a plurality of compression chambers with the fixed scroll is provided (for example, JP-A-11-280671).
[0003]
In this type of conventional scroll type fluid machine, a suction shaft provided on the outer peripheral side of the fixed scroll by rotating the drive shaft from the outside and causing the orbiting scroll to orbit with a certain eccentric dimension relative to the fixed scroll. The air is sequentially compressed in each compression chamber between the fixed scroll and the orbiting scroll while the air is sucked in from. And compressed air is discharged outside from the discharge port provided in the center part of the fixed scroll, and is stored in an air tank or the like.
[0004]
In this prior art, a plurality of rolling elements are provided between the casing and the back of the orbiting scroll so as to be capable of rolling with both. And at the time of compression operation, it is the structure which supports the thrust load which acts on a turning scroll by a rolling element, rolling a rolling element between a casing and a turning scroll according to the turning operation | movement of a turning scroll.
[0005]
[Problems to be solved by the invention]
By the way, in the above-described conventional technology, the discharge pipe connecting the discharge port and the air tank is provided with a check valve located in the vicinity of the air tank, and when the compression operation is stopped by the check valve, The compressed air stored in is prevented from leaking back through the discharge pipe.
[0006]
However, when the compression operation is stopped, the compressed air remaining in the discharge pipe flows backward from the discharge port into the compression chamber. In this prior art, since the other check valve for preventing the backflow of the compressed air is usually provided also on the suction port side, the compressed air that has flowed back into the compression chamber as described above is externally provided. It does not escape instantly and gradually flows out from between the fixed scroll and the orbiting scroll.
[0007]
As a result, immediately after the compression operation is stopped, the thrust load acting on the orbiting scroll due to the compressed air flowing back into the compression chamber is greatly increased to about four times that in the steady operation.
[0008]
For this reason, for example, when the compression operation is started and stopped alternately and repeatedly, an excessive thrust load is repeatedly applied to the rolling elements between the casing and the orbiting scroll, and the rolling elements and the casing In the meantime, there is a problem that abnormal wear tends to occur between the rolling elements and the orbiting scroll.
[0009]
The present invention has been made in view of the above-described problems of the prior art, and the present invention can suppress an excessive increase in the thrust load acting on the orbiting scroll immediately after the compression operation is stopped. Provides a scroll fluid machine that prevents abnormal wear from occurring on rolling elements that support the wheel, improves durability and service life, stabilizes the behavior of the orbiting scroll, and improves compression performance The purpose is to do.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, a scroll fluid machine according to the present invention includes a casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing, and a tip end side of the drive shaft. The orbiting scroll is provided so as to be able to turn, and defines a plurality of compression chambers between the fixed scroll and thrust load support means for supporting a thrust load acting on the orbiting scroll.
[0011]
According to the first aspect of the present invention, the thrust load support means includes a plurality of rolling elements provided in a rollable manner between the casing and the rear surface of the orbiting scroll, and the casing and the orbit. Provided on at least one of the back surfaces of the scroll and provided with a bottomed guide hole that opens at a position corresponding to each rolling element, and is movable in the guide hole along the axial direction of the drive shaft. A contact member that contacts the rolling element, an elastic body that is provided in the guide hole and urges the contact member against the thrust load, and the contact member is held in the guide hole in a retaining state. This is because it is composed of a stopper.
[0012]
With this configuration, when a thrust load is applied to the orbiting scroll during the compression operation, the contact member that contacts the rolling element is urged against the thrust load by the elastic body provided in the guide hole, For example, the rolling element can be pressed against the orbiting scroll. Thereby, the orbiting scroll is pressed to the fixed scroll side, and the airtightness in the compression chamber can be improved.
[0013]
At this time, since the contact member is held in the guide hole by the stopper, the contact member is not urged more strongly than necessary to the rolling element side by the elastic body, and the rolling element is moved to the casing. The thrust load that acts on the orbiting scroll can be stably supported by the rolling elements.
[0014]
Further, when the thrust load acting on the orbiting scroll increases immediately after stopping the compression operation, the orbiting scroll is pressed against the rolling element by the thrust load, and the contact member that comes into contact with the rolling element is pushed into the guide hole. The elastic body is compressed and deformed between the rolling element and the guide hole.
[0015]
As a result, the axial gap (thrust direction) between the fixed scroll and the orbiting scroll is enlarged by the amount of movement of the contact member, and the pressure in the compression chamber is released to the outside through this gap, and the thrust load is reduced. Can be kept small. Further, when the orbiting scroll is pressed to the rolling element side by the thrust load in this way, the elastic body is compressed and deformed as described above, thereby buffering the impact acting between the rolling element and the casing and the orbiting scroll. Can weaken.
[0016]
Further, in the invention of claim 2, the rolling element is formed of a sphere, and a cylindrical sphere accommodating case for accommodating the sphere is provided on one of the casing and the back of the orbiting scroll, and the stopper is provided on the sphere accommodating case. The structure is integrally formed on the inner peripheral side.
[0017]
Thereby, it is possible to restrict the sphere from being displaced in the radial direction between the casing and the orbiting scroll during the orbiting movement of the orbiting scroll by the sphere accommodating case, and the sphere can be smoothly rolled in the sphere accommodating case. Further, by forming the stopper integrally with the sphere housing case, it is possible to save the trouble of separately mounting the sphere housing case and the stopper when the thrust load supporting means is attached.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an oil-free scroll air compressor will be described as an example of a scroll fluid machine according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings.
[0019]
1 to 4 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a bottomed cylindrical casing that forms an outer frame of a scroll type air compressor. The casing 1 is formed from an annular bottom 1A and an outer peripheral side of the bottom 1A toward a fixed scroll 2 described later. It is comprised by the cylinder part 1B extended and the bearing part 1C protrudingly provided by the inner peripheral side of the said bottom part 1A. Further, circular case mounting grooves 1D, 1D,... (Only two are shown) are formed in the bottom 1A of the casing 1 so as to be located around a slider 12 described later, and each case mounting groove 1D is described later. A spherical housing case 22 is attached.
[0020]
Reference numeral 2 denotes a fixed scroll fixed to the front end side of the casing 1, and the fixed scroll 2 is formed in a substantially disc shape and is arranged so that the center thereof coincides with an axis of a drive shaft 3 described later, A spiral wrap portion 2B erected on the surface of the end plate 2A, a cylindrical portion 2C protruding in the axial direction so as to surround the wrap portion 2B from the outer peripheral side of the end plate 2A, and an outer peripheral side of the cylindrical portion 2C And a flange portion 2D attached to an opening end of the cylindrical portion 1B of the casing 1. Further, the fixed scroll 2 has a sliding contact surface 2E in which an end surface of the flange portion 2D is in sliding contact with an end plate 4A of the orbiting scroll 4 described later.
[0021]
A drive shaft 3 is rotatably supported in the bearing portion 1C of the casing 1. The drive shaft 3 is connected to a drive source (not shown) on the base end side, and a crank 3A on the front end side. It extends into the casing 1. As shown in FIG. 1, the crank 3 </ b> A of the drive shaft 3 is eccentric with respect to the axis of the drive shaft 3 by a dimension δ.
[0022]
Reference numeral 4 denotes a orbiting scroll provided in the casing 1 so as to be opposed to the fixed scroll 2, and the orbiting scroll 4 is provided with an end plate 4 </ b> A formed in a disk shape and a surface of the end plate 4 </ b> A. It is comprised by the spiral-shaped lap | wrap part 4B. Further, the end plate 4A of the orbiting scroll 4 has a boss portion 4C projecting from the center on the back side thereof, and the boss portion 4C is rotatably attached to the crank 3A of the drive shaft 3 by the orbiting bearing 5. Further, on the outer peripheral side of the end plate 4A, a surface facing the sliding contact surface 2E of the fixed scroll 2 is a sliding contact surface 4D.
[0023]
Here, a gap S1 is provided in the axial direction between the crank 3A of the drive shaft 3 and the boss portion 4C of the orbiting scroll 4, as shown in FIG. It compensates for movement in the thrust direction (axial direction) following the contact plate 26.
[0024]
The orbiting scroll 4 is disposed so as to overlap the wrap portion 2B of the fixed scroll 2 by, for example, 180 degrees, and a plurality of compression chambers 6, 6,... Are defined between the wrap portions 2B, 4B. Made. During the operation of the scroll type air compressor, the air is sucked into the compression chamber 6 on the outer peripheral side from the suction port 7 provided on the outer peripheral side of the fixed scroll 2, while the revolving scroll 4 performs the revolving motion. The air is compressed sequentially in the compression chamber 6, and finally, compressed air is discharged from the compression chamber 6 on the center side toward the discharge port 8 provided in the center of the fixed scroll 2.
[0025]
Reference numeral 9 denotes a rotation prevention mechanism for preventing the rotation of the orbiting scroll 4, and the rotation prevention mechanism 9 includes four first guides 10, 10,... Provided on the bottom 1 A of the casing 1 and the end plate 4 A of the orbiting scroll 4. , And four sliders 12 provided between the first guide 10 and the second guide 11.
[0026]
The rotation prevention mechanism 9 prevents the orbiting scroll 4 from rotating by the slider 12 being guided in two orthogonal directions by the first guide 10 and the second guide 11, and the orbiting scroll 4 has a dimension δ. It is configured to give a circular motion (turning motion) with a turning radius.
[0027]
Reference numeral 21 denotes a thrust load support mechanism provided between the casing 1 and the orbiting scroll 4. The thrust load support mechanism 21 includes a sphere housing case 22, a sphere 24, a guide hole 25, a contact plate 26, a pressing spring, which will be described later. 27, the stopper 28 and the contact plate 30 are roughly constituted.
[0028]
.. Are four spherical housing cases provided in each case mounting groove 1D of the casing 1, and the spherical housing case 22 is formed in a cylindrical shape using a resin material such as plastic, and its base end. The side is fixedly attached to the case mounting groove 1D of the casing 1 by press-fitting or bonding. In addition, a dust seal 23 is provided on the front end side of the spherical housing case 22, and the dust seal 23 seals between the end plate 4 </ b> A of the orbiting scroll 4 and prevents dust and the like from entering the spherical housing case 22 from the outside. It is to prevent.
[0029]
24, 24,... Are four spheres as rolling elements provided between the bottom 1 A of the casing 1 and the end plate 4 A of the orbiting scroll 4. The spheres 24 are placed in the sphere housing case 22. It is accommodated and is in contact with rolling plates 26 and 30 to be described later in a rollable manner. The spherical body 24 is configured to support a thrust load F1 acting on the orbiting scroll 4 as shown in FIGS.
[0030]
.. Are four guide holes (only two are shown) provided in the bottom 1A of the casing 1. The guide holes 25 open to the bottom 1A of the casing 1 at positions corresponding to the spheres 24. It is formed as a bottomed hole. The guide hole 25 is formed as a circular stepped hole by the small diameter portion 25A and the large diameter portion 25B, and a step portion 25C is formed between the small diameter portion 25A and the large diameter portion 25B.
[0031]
The guide hole 25 guides the contact plate 26 so as to be movable in the axial direction of the drive shaft 3 (hereinafter referred to as the thrust direction). When the inside of the large-diameter portion 25B moves in a direction to be pushed toward the small-diameter portion 25A, the contact plate 26 contacts the step portion 25C, thereby restricting further movement of the contact plate 26. ing.
[0032]
26, 26,... Are four abutting plates (only two are shown) serving as abutting members movably provided in the large-diameter portion 25B of the guide hole 25. The corresponding abutting plates 26 are wear resistant. Is formed as a circular plate, and is inserted into the large diameter portion 25B of the guide hole 25 with a gap S2 in the axial direction as shown in FIG.
[0033]
The contact plate 26 contacts the spherical body 24 and moves in the thrust direction in the large diameter portion 25B of the guide hole 25 in accordance with the magnitude of the thrust load F1 acting on the orbiting scroll 4 in this state. Yes.
[0034]
27, 27,... Are four pressing springs (only two are shown) as elastic bodies provided in the small diameter portion 25A of the guide hole 25 so as to be extendable and contracting, and the pressing springs 27 act on the orbiting scroll 4. The contact plate 26 is biased against the thrust load F1.
[0035]
Here, when the spring set pressure of each pressing spring 27 is F2, the total value (F2 × 4) of the respective spring set pressures F2 is the maximum value of the thrust load F1 acting on the orbiting scroll 4 during the compression operation (for example, Slightly larger than about 12 MPa), for example, about 13 to 15 MPa. For this reason, during the compression operation, the contact plate 26 continues to contact the spherical body 24 while being pressed against the stopper 28 by the pressing spring 27.
[0036]
As will be described later, when the thrust load F1 increases immediately after the compression operation is stopped, the pressing spring 27 is compressed and deformed by the thrust load F1 as shown in FIG. The part 25B moves until it abuts on the step part 25C. As a result, the orbiting scroll 4 follows the contact plate 26 and moves in the thrust direction, and the gap G in the thrust direction between the casing 1 and the orbiting scroll 4 increases.
[0037]
.. Are four stoppers provided on the bottom 1A of the casing 1 and located on the opening end side of the large diameter portion 25B of the guide hole 25. The stopper 28 is more than the large diameter portion 25B of the guide hole 25. The outer peripheral side is fixed to the bottom 1A of the casing 1 by screwing or bonding. The stopper 28 holds the contact plate 26 in the large diameter portion 25 </ b> B of the guide hole 25 in a state of being prevented from coming off by the contact plate 26 coming into contact with the inner peripheral end side thereof.
[0038]
29, 29,... Are four mounting recesses (only two are shown) provided on the back side of the end plate 4A of the orbiting scroll 4. The mounting recess 29 corresponds to the spherical body 24 of the end plate 4A of the orbiting scroll 4. A circular bottomed hole is formed at the position.
[0039]
Reference numeral 30 denotes another contact plate fitted in the mounting recess 29 on the orbiting scroll 4 side. The contact plate 30 is also made of a metal material having wear resistance and the like in the same manner as the contact plate 26. It is formed as a circular plate and is in contact with the sphere 24.
[0040]
Reference numeral 31 denotes a discharge pipe connected to the discharge port 8, and the discharge pipe 31 discharges compressed air from the discharge port 8 toward an external air tank 32. Further, a check valve 33 is provided in the vicinity of the air tank 32 in the middle of the discharge pipe 31, and the check valve 33 allows compressed air stored in the air tank 32 to enter the discharge pipe 31. Prevents leakage. Further, another check valve (not shown) is provided on the suction port 7 side, and this check valve prevents the backflow of compressed air from the suction port 7 side.
[0041]
The scroll type air compressor according to the present embodiment has the above-described configuration, and the operation thereof will be described next.
[0042]
First, when the drive shaft 3 is rotated by an electric motor, the orbiting scroll 4 performs a circular motion (orbiting motion) with a turning radius of a dimension δ around the drive shaft 3, and the orbiting scroll and the wrap portion 2 </ b> B of the fixed scroll 2. The compression chambers 6, 6,... Defined between the four wrap portions 4B are continuously reduced. Thereby, the compressed air is stored in the external air tank 32 from the discharge port 8 of the fixed scroll 2 through the discharge pipe 31 while sequentially compressing the outside air sucked from the suction port 7 of the fixed scroll 2 in each compression chamber 6. .
[0043]
At this time, the thrust load support mechanism 21 is rotated by the ball 24 coming into contact with the contact plate 26 on the casing 1 side and the contact plate 30 on the orbiting scroll 4 side and rolling between them. A thrust load F 1 acting on the scroll 4 is supported by the sphere 24.
[0044]
By the way, in this embodiment, since the check pipe 33 is provided in the vicinity of the air tank 32 in the discharge pipe 31, the compressed air remaining in the discharge pipe 31 is discharged immediately after the compression operation is stopped. The gas flows backward from the outlet 8 into the compression chamber 6. Since another check valve is also provided on the suction port 7 side, the compressed air flowing back into the compression chamber 6 as described above does not escape from the suction port 7 side, and the thrust load acting on the orbiting scroll 4 F1 increases.
[0045]
Therefore, in the present embodiment, the contact plate 26 that contacts the sphere 24 is guided by the guide hole 25 so as to be movable in the thrust direction, and the contact plate 26 is urged toward the sphere 24 by the pressing spring 27. ing. The total value (F2 × 4) of the spring set pressure F2 of each pressing spring 27 is set slightly larger than the thrust load F1 acting on the orbiting scroll 4 during the compression operation.
[0046]
Therefore, when the thrust load F1 increases immediately after stopping the compression operation as described above, the orbiting scroll 4 is strongly pressed toward the sphere 24 as shown in FIG. 30 moves in the thrust direction in the large diameter portion 25B of the guide hole 25 toward the small diameter portion 25A until it abuts on the step portion 25C while compressing and deforming the pressing spring 27 with the guide hole 25. Then, the orbiting scroll 4 moves following the contact plate 26, and the gap G in the thrust direction between the fixed scroll 2 and the orbiting scroll 4 increases.
[0047]
As a result, the pressure in the compression chamber 6 can be released to the outside through the space between the sliding contact surfaces 2E and 4D of the fixed scroll 2 and the orbiting scroll 4 as shown by the arrows in FIG. 4, and the thrust load F1 can be reduced.
[0048]
Further, when the orbiting scroll 4 is strongly pressed toward the sphere 24 by the thrust load F1, the pressing spring 27 is compressed and deformed between the guide hole 25 and the abutting plate 26 as described above. The impact generated between the sphere 24 and the contact plates 26 and 30 can be buffered (absorbed) by the pressing spring 27 and weakened.
[0049]
Thus, in this embodiment, even when the compressed air in the discharge pipe 31 flows back into the compression chamber 6 immediately after the compression operation is stopped, the thrust load F1 acting on the orbiting scroll 4 is reduced as in the compression operation. Therefore, it is possible to prevent uneven wear and the like between the sphere 24 and the contact plates 26, 30 and to extend the durability and life of the sphere 24 and the contact plates 26, 30.
[0050]
Further, as shown in FIG. 3, during the compression operation, the orbiting scroll 4 is biased toward the fixed scroll 2 by the spring force of the pressing spring 27, and the sliding contact surface 4 </ b> D of the orbiting scroll 4 is brought into sliding contact with the fixed scroll 2. It is possible to improve the compression efficiency by improving the airtightness in the compression chamber 6.
[0051]
In addition, since the contact plate 26 is held in the guide hole 25 by the stopper 28, the contact plate 26 is not urged more strongly than necessary by the pressing spring 27 toward the spherical body 24. Thus, the sphere 24 can be smoothly rolled between the contact plates 26 and 30, and the thrust load F1 acting on the orbiting scroll 4 can be stably supported by the sphere 24, and the behavior of the orbiting scroll 4 can be improved. It can be stabilized and the performance, reliability, etc. of the air compressor can be improved.
[0052]
Further, since the guide hole 25 is formed as a step portion 25C between the small diameter portion 25A and the large diameter portion 25B, as described above, the contact plate 30 passes through the large diameter portion 25B of the guide hole 25 toward the small diameter portion 25A. When the contact plate 30 is moved, the contact plate 30 is in contact with the step portion 25C, whereby further movement of the contact plate 30 can be restricted.
[0053]
As a result, the pressing spring 27 can be prevented from being deformed more than necessary between the guide hole 25 and the contact plate 30, and the spring force of the pressing spring 27 can be maintained over a long period of time. Can extend the lifespan.
[0054]
Next, FIG. 5 shows a second embodiment of the present invention. The feature of the present embodiment is that a stopper that holds the contact plate in the guide hole in a retaining state is provided on the inner peripheral side of the spherical housing case. It is in the structure which forms integrally. In this embodiment, the same reference numerals as those in the first embodiment are given, and the description thereof is omitted.
[0055]
In the figure, reference numeral 41 denotes a thrust load support mechanism according to the present embodiment. The thrust load support mechanism 41 includes a sphere 24, a guide hole 25, a contact plate 26, a pressing spring 27, a contact plate 30, and a sphere housing described later. The case 42 is generally configured.
[0056]
Reference numeral 42 denotes a sphere housing case used in the present embodiment, and the sphere housing case 42 is also formed in a cylindrical shape from a resin material or the like in substantially the same manner as the sphere housing case 22 described in the first embodiment. .
[0057]
However, it differs from that of the first embodiment in that an annular stopper portion 42A is integrally formed radially inward on the inner peripheral side of the spherical housing case 42. The stopper 42 </ b> A of the spherical body housing case 42 holds the contact plate 26 in the guide hole 25 so as not to be pulled out, like the stopper 28 according to the first embodiment.
[0058]
Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, since the stopper portion 42A is integrally formed on the inner peripheral side of the sphere housing case 42, it is troublesome to separately attach the sphere housing case 42 and the stopper portion 42A when the thrust load support mechanism 41 is attached. Can be omitted, and workability can be improved.
[0059]
In the first embodiment, the guide hole 25 is provided on the casing 1 side, and the contact plate 26 provided in the guide hole 25 is biased toward the orbiting scroll 4 by the pressing spring 27. However, instead of this, a guide hole 25 ′ is provided on the side of the orbiting scroll 4 and a contact plate 30 is provided in the guide hole 25 ′, for example, as in the modification shown in FIG. At the same time, the contact plate 30 may be biased toward the casing 1 by a pressing spring 27 '. This also applies to the second embodiment.
[0060]
Here, in this modification, the guide hole 25 ′ is constituted by a small diameter portion 25 A ′, a large diameter portion 25 B ′, and a step portion 25 C ′, similarly to the guide hole 25 described in the first embodiment. . The contact plate 26 is fitted and attached in an attachment recess 29 'provided on the casing 1 side. Further, the spherical body housing case 22 'and the stopper 28' are attached to the orbiting scroll 4 side.
[0061]
In the first embodiment, the case where the sphere housing case 22 is formed using a resin material such as plastic has been described as an example. However, instead of this, for example, a sphere housing case is formed using a metal material or the like. It may be formed. This also applies to the second embodiment.
[0062]
Furthermore, in each 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 vacuum pump, a refrigerant compressor, and the like.
[0063]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the plurality of rolling elements constituting the thrust load support means are provided between the casing and the back surface of the orbiting scroll, and at least one of the casing and the back surface of the orbiting scroll. One of the guide holes is provided with a bottom, and a contact member that contacts the rolling element is movably provided in the guide hole. The contact member is made of an elastic body against a thrust load acting on the orbiting scroll. Since the structure is biased, when the thrust load increases immediately after the compression operation is stopped, the elastic body is compressed and deformed between the contact member and the guide hole by the thrust load, so that the elastic plate is moved together with the contact plate. Thus, the orbiting scroll can be moved in the axial direction of the drive shaft, and the axial gap (thrust direction) between the fixed scroll and the orbiting scroll can be enlarged.
[0064]
As a result, the pressure in the compression chamber is released from between the fixed scroll and the orbiting scroll to the outside, and the thrust load can be reduced, and the impact applied to the rolling element between the casing and the orbiting scroll is buffered by the elastic body. It can be weakened, and uneven wear or the like can be prevented between the rolling elements and the casing, and between the rolling elements and the orbiting scroll, and the durability and life of the scroll type fluid machine can be extended.
[0065]
In addition, since the contact member is held in the guide hole by the stopper, the contact member is not urged more strongly than necessary by the elastic body, and the rolling member is not compressed during the compression operation. Can be smoothly rolled between the casing and the orbiting scroll, and the thrust load acting on the orbiting scroll can be stably supported by the rolling elements.
[0066]
Further, since the invention of claim 2 is configured to integrally form the stopper on the inner peripheral side of the sphere housing case, it is possible to save the trouble of separately mounting the sphere housing case and the stopper when the thrust load support means is attached. Workability can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to a first embodiment of the present invention.
2 is a cross-sectional view of the anti-rotation mechanism, the thrust load support mechanism, and the like as seen from the direction of arrows II-II in FIG.
FIG. 3 is an enlarged cross-sectional view of a main part showing the thrust load support mechanism and the like in FIG. 1 in an enlarged manner.
4 is an enlarged cross-sectional view similar to FIG. 3 showing a state where the contact plate has moved in the guide hole. FIG.
5 is a cross-sectional view of a thrust load support mechanism and the like of a scroll type air compressor according to a second embodiment of the present invention as seen from the same position as in FIG.
6 is a cross-sectional view of a thrust load support mechanism and the like of a scroll type air compressor according to a modification of the present invention as seen from the same position as in FIG. 3;
[Explanation of symbols]
1 casing
2 Fixed scroll
4 Orbiting scroll
6 Compression chamber
21, 41 Thrust load support mechanism (thrust load support means)
22, 22 ', 42 Sphere housing case
24 Sphere (Rolling body)
25,25 'guide hole
26, 30 Contact plate (contact member)
27, 27 'pressure spring (elastic body)
28, 28 'stopper
42A Stopper

Claims (2)

A casing, a fixed scroll provided on the casing, a drive shaft rotatably provided on the casing, and a plurality of compression chambers provided between the fixed scroll and a rotary shaft provided on the front end side of the drive shaft. In a scroll type fluid machine comprising: a turning scroll that defines a thrust load; and a thrust load support means that supports a thrust load acting on the turning scroll.
The thrust load support means is provided on at least one of a plurality of rolling elements provided in a rollable manner between the casing and the back surface of the orbiting scroll, and the back surface of the casing and the orbiting scroll. A bottomed guide hole that opens to a position corresponding to the rolling element, a contact member provided in the guide hole so as to be movable along the axial direction of the drive shaft, and a contact member that contacts the rolling element, and in the guide hole A scroll type fluid machine comprising: an elastic body that is provided and biases the corresponding contact member against the thrust load; and a stopper that holds the contact member in a retaining state in the guide hole. The rolling element comprises a sphere, and a cylindrical rolling element accommodation case for accommodating the sphere is provided on one of the casing and the rear surface of the orbiting scroll, and the stopper is provided on the inner peripheral side of the rolling element accommodation case. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is integrally formed.

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