JPH09268984A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably supply lubricant between a casing and a turning scroll, prevent the wear of both of these and improve the durability and service life by mounting a lubricant holder on a sphere. SOLUTION: A slider 16 is slidably arranged between a casing 1 and the slide face 7D of a turning scroll 7 so that the slider 16 can be slid in the Y-axis direction by each Y-axis guide 15 on the casing 1 side and the turning scroll 7 can be slid in the X-axis direction by each X-axis guide 14 on the turning scroll 7 side. Each sphere 18 is inserted in each through-hole 16C in the slider 16 and a lubricant holder 19 in which grease is stored is slidably mounted outside each sphere 18. Each sphere 18 is rolled between the casing 1 side and the turning scroll 7 side to supply grease from the lubricant holder 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

[0002]

2. Description of the Related Art Generally, a casing, a fixed scroll provided integrally with the casing, a drive shaft having a base end rotatably supported by the casing and a distal end serving as a crank, and orbiting about the crank of the drive shaft 2. Description of the Related Art There is known a scroll-type fluid machine that includes an orbiting scroll that is provided to define a plurality of compression chambers between the orbiting scroll and a fixed scroll, and a rotation preventing mechanism that prevents the orbiting scroll from rotating.

In this type of scroll fluid machine according to the related art, the orbiting scroll is rotationally driven from the outside with a fixed eccentric dimension relative to the fixed scroll by driving the drive shaft from the outside, so that the orbiting scroll is provided on the outer peripheral side of the fixed scroll. While sucking fluid (e.g., air) from the suction port, the fluid is sequentially compressed in each compression chamber between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll, and is discharged from the discharge port provided at the center of the fixed scroll. The compressed fluid is discharged to the outside.

Here, as a first prior art, for example, in an oilless scroll type fluid machine described in Japanese Patent Application Laid-Open No. 2-2777984, a plurality of auxiliary cranks are provided in order to prevent the orbiting scroll from rotating. Is known. That is, a plurality of auxiliary cranks are provided between the casing and the rear side of the orbiting scroll and on the outer peripheral side of the orbiting bearing provided on the orbiting scroll, thereby preventing the orbiting scroll from rotating.

As a second prior art, for example, US Pat. No. 3,994,635 discloses an Oldham coupling which prevents the orbiting scroll from rotating. And in the case of a rotation prevention mechanism by this kind of Oldham coupling,
In order to maintain the lubricity of the Oldham joint, a lubricant is constantly supplied to the sliding portion of the Oldham joint.

Further, as a rotation preventing mechanism according to the third prior art, for example, Japanese Patent Application Laid-Open No. 58-135302 or Japanese Patent Application Laid-Open No. 60-198301 discloses a number of spherical bodies and the same number of guide holes. There is disclosed a ball-coupling type ball comprising two ring-shaped plates, wherein the sphere has a function of preventing rotation of the orbiting scroll and a function of a thrust bearing against a thrust load of the orbiting scroll.

Further, as a fourth prior art, for example, in Japanese Patent Application Laid-Open No. 55-155916, a plurality of grooves serving as guides are provided on the casing and on the back side of the orbiting scroll, and The sphere is accommodated between the groove on the scroll side.

[0008]

By the way, in the scroll type fluid machines according to the above-mentioned prior arts, the compression chamber formed between the fixed scroll and the orbiting scroll during operation when used as a scroll type compressor, for example. Becomes high pressure, the orbiting scroll is pressed in the thrust direction, and the following problems occur.

That is, in the first prior art, the thrust direction pressing force is received by a plurality of combined angular bearings that support each auxiliary crank. Therefore, the structure of the auxiliary crank and the like is complicated by the angular bearing. In addition, the number of parts is increased and the assemblability is deteriorated, and the entire apparatus is enlarged. In addition, it is necessary to match the eccentric dimensions of each auxiliary crank and the drive shaft, and high-precision machining is required.

On the other hand, in the second conventional technique, thrust force from the orbiting scroll or the like directly acts on both surfaces of the Oldham's joint for preventing the orbiting scroll from rotating.
The Oldham joint is easily worn by sliding with an orbiting scroll and the like, so that it is necessary to constantly supply a lubricant to the sliding portion of the Oldham joint, which is difficult to apply to an oil-free scroll fluid machine. There is a problem.

Further, in the rotation preventing mechanism using the ball coupling system as the third conventional technique, it is difficult to accurately adjust the size of the clearance in the radial direction, and it is difficult to block the noise generated from the spherical body. Since the ring-shaped plate cannot be made thick enough, there is a problem that the ring-shaped plate is worn or deformed.

Further, in the fourth prior art, the thrust force in the thrust direction is merely received by the respective concave grooves on the casing side and the orbiting scroll side via the spherical body, and the bottom of each concave groove is received. There is a problem that it is difficult to maintain a lubrication state with the sphere for a long period of time.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can simplify the structure as, for example, an oil-free type and stabilizes the lubricant on the spherical body between the casing side and the orbiting scroll. It is an object of the present invention to provide a scroll type fluid machine which can be supplied as a sphere and can be prevented from being worn out for a long time and the durability and life can be greatly improved.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a casing, a fixed scroll provided integrally with the casing, and a fixed scroll provided rotatably with respect to the fixed scroll. The present invention is applied to a scroll-type fluid machine including a revolving scroll that defines a plurality of compression chambers between the scroll and the scroll.

The feature of the structure adopted by the invention of claim 1 is that it is slidably disposed between the casing and the rear side of the orbiting scroll, and is spaced apart in the circumferential direction of the orbiting scroll. A slider having a plurality of through holes extending in the thrust direction, and a casing side and a rear surface of the orbiting scroll inserted in the through holes of the slider so as to receive a load in the thrust direction from the orbiting scroll. A plurality of spheres rotatably disposed between the spheres and the sliders, and each sphere is located in each through hole of the slider and surrounds each sphere, and the lubricant contained inside is supplied to each sphere. It has a plurality of lubricant holders.

With this construction, the load in the thrust direction from the orbiting scroll can be reliably received by each sphere, and this load can be prevented from directly acting on the slider, so that the casing side and the orbiting scroll are connected. It is possible to reliably reduce the sliding resistance received by the slider during the period. Also,
Since the lubricant can be supplied from the inside of the lubricant holder to the surface of each sphere, it is possible to reliably reduce the frictional resistance of each sphere rolling while receiving the load in the thrust direction between the casing side and the orbiting scroll. You can

According to the second aspect of the invention, a protrusion is provided between the through hole of the slider and the lubricant holder to restrict rotation of the lubricant holder in the through hole of the slider. There is something.

Accordingly, the lubricant holder on the outer side of the spherical body is prevented from rotating in each through hole of the slider due to the rolling movement of the spherical body by the protrusion, so that the spherical body rolls with the orbiting motion of the orbiting scroll. The lubricant holder can be slid sufficiently and the frictional heat of both can be used to stably supply the lubricant in the lubricant holder to the surface of the spherical body.

Further, in the invention according to claim 3, the lubricant holder is formed of a heat resistant resin material.

As a result, even if the lubricant holder receives heat due to rolling or sliding of the sphere, the lubricant holder can surely hold the internal lubricant, and the lubricant can be stabilized on the surface of the sphere. And continue to supply.

[0021]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 5 show a scroll type air compressor as an example of a scroll type fluid machine according to an embodiment of the present invention.

In the figure, 1 indicates a stepped cylindrical casing,
The casing 1 has one end side (base end side) of a drive shaft 3 described later.
A bearing portion 1A in which is inserted, a flange portion 1B integrally formed on the other end side of the bearing portion 1A, and a cylindrical large diameter portion 1C extending from the outer peripheral side of the flange portion 1B toward the other side. It is roughly composed of. Then, as shown in FIG. 2, each flange 12 of the casing 1 is integrally formed with a support member 12 described later or as a separate member.

Reference numeral 2 denotes a fixed scroll fixed to the front end side of the large diameter portion 1C of the casing 1. The fixed scroll 2
Is such that the center coincides with the axis O1-O1 of the drive shaft 3.
A mirror plate 2A disposed at the center, a spiral wrap portion 2B standing upright from the surface of the mirror plate 2A and having a winding start end on the center side and a winding end end on the outer peripheral side, and a wrap portion 2B having a diameter The mounting portion 2 is integrally formed on the outer peripheral side of the end plate 2A so as to surround from the outer side in the direction, and is fixed to the large diameter portion 1C of the casing 1.
C.

Reference numeral 3 denotes a bearing 4 in a bearing portion 1A of the casing 1.
5 shows a drive shaft rotatably supported via 5, and the distal end side of the drive shaft 3 extends into the large diameter portion 1 </ b> C of the casing 1 to become a crank 3 </ b> A and the axis O 1 − of the drive shaft 3. O
The axis O2-O2 of the crank 3A is eccentric by a predetermined dimension .delta. The base end of the drive shaft 3 protruding out of the casing 1 from the bearing portion 1A is connected to a drive source (not shown), and the drive source 3 is driven to rotate by the drive source, thereby turning the drive shaft 3 through the crank 3A. The later-described orbiting scroll 7 is orbited. Further, 6 is a balance weight fixed to the base end side of the crank 3A, and the balance weight 6 balances the rotation of the drive shaft 3 with respect to the orbiting motion of the orbiting scroll 7.

Reference numeral 7 denotes an orbiting scroll located in the casing 1 and provided at the tip of the crank 3A of the drive shaft 3. The orbiting scroll 7 is a disk-shaped end plate 7A.
And a spiral wrap portion 7B standing upright on the surface of the end plate 7A, with the center side being the winding start end and the outer peripheral side being the winding end end.
And a boss 7C provided at the center of the rear surface of the end plate 7A. The boss portion 7C of the orbiting scroll 7 projects toward the base end side of the casing 1, and the crank 3A of the drive shaft 3 is inside the boss portion 7C.
It is rotatably inserted through the. The back surface of the orbiting scroll 7 is a sliding surface 7D that faces the flange portion 1B of the casing 1 via a slider 16 described below and slides on the slider 16.

Here, the wrap portion 7B of the orbiting scroll 7
Is disposed so as to overlap the wrap portion 2B of the fixed scroll 2 by a predetermined angle (for example, 180 degrees).
A plurality of compression chambers 9, 9, ... Are formed between the wrap portion 2B of the fixed scroll 2 and the wrap portion 7B of the orbiting scroll 7 from the outer peripheral side to the center side. Further, the end plate 2A of the fixed scroll 2 has a suction port 10 formed so as to communicate with the outer peripheral compression chamber 9, and a discharge port 11 formed so as to communicate with the central compression chamber 9.

, 12 show bearings provided on the flange portion 1B of the casing 1, and each of the bearings 12 is, as shown in FIG. )
Are arranged at four locations apart from each other in the left and right (X axis) directions, and protrude from the inner surface of the flange portion 1B of the casing 1 toward the sliding surface 7D side of the orbiting scroll 7 with a certain height dimension, and protrude. The end surface on the end side is a sliding surface 12A on which a slider 16 described later slides. Then, a Y-axis guide 15 for restricting movement of a slider 16 to be described later in left and right (X-axis) directions is integrally formed as a stepped portion extending in the upper and lower (Y-axis) directions on each of the bearings 12.

Reference numeral 13 denotes a rotation prevention mechanism for preventing rotation of the orbiting scroll 7, and the rotation prevention mechanism 13 has X-axis guides 14, Y-axis guides 15 and sliders, which will be described later, as shown in FIGS. 16 and the like are configured as an Oldham coupling. Then, the rotation prevention mechanism 13 slides and displaces the slider 16 in the X-axis and Y-axis directions,
While preventing the orbiting scroll 7 from rotating, the orbiting scroll 7 is allowed to make a circular motion having a turning radius of the predetermined dimension δ.

Reference numerals 14, 14, ... Denote X-axis guides provided on the sliding surface 7D side of the orbiting scroll 7, and each X-axis guide 14 is at four locations on the outer peripheral side of the orbiting scroll 7, as shown in FIG. Respectively, and protrudes from the sliding surface 7D of the orbiting scroll 7 toward the flange portion 1B of the casing 1. Then, each X-axis guide 14 separated in the Y-axis direction
Each side surface 16F of a slider 16 to be described later is slidably mounted between them, and each X-axis guide 14 in this state compensates for the orbiting scroll 7 slidingly displacing with respect to the slider 16 in the X-axis direction. However, the movement in the Y-axis direction is restricted.

Reference numerals 15, 15, ... Show Y-axis guides provided on the support 12, and each Y-axis guide 15 is formed as a step portion extending in the Y-axis direction as shown in FIG. Side faces 16G of a slider 16 described later are slidably mounted between the Y-axis guides 15 spaced apart from each other. Then, in this state, each Y-axis guide 15 compensates for the slider 16 slidingly displacing in the Y-axis direction with respect to the casing 1 and restricts the movement in the X-axis direction.

Reference numeral 16 denotes a slider slidably disposed between the casing 1 and the sliding surface 7D side of the orbiting scroll 7, and the slider 16 is, as shown in FIGS.
Four sliding parts 16A, 16A, which are formed as rectangular parallelepiped small pieces that are separated in the upper, lower (Y axis), left, right (X axis) directions.
, And four connecting portions 16B, 16B, ... Each of which is formed in a rod shape so as to connect each of the sliding portions 16A, and has a rectangular ring shape as a whole.

Further, through-holes 16C, 16C, ... Extending in the thrust direction are bored in the respective sliding portions 16A of the slider 16, and the through-holes 16C have respective spheres 1 to be described later.
8 is inserted together with each lubricant holder 19. Each of the through holes 16C is formed so that its diameter is larger than the diameter of each sphere 18 by a certain dimension. Further, as shown in FIG. 5, in each through hole 16C, the engaging protrusions 17, 1 on the slider 16 side that form a protrusion 21 described later are formed.
7 are formed so as to project inward in the radial direction so as to face each other at the diameter position of each through hole 16C.

Further, as shown in FIG. 4, both end surfaces of the slider 16 in the thrust direction slide between the sliding surfaces 7D and 12A of the orbiting scroll 7 and the support 12 and slide surfaces 16D and 16D.
16E, and the side surfaces 16F facing each other in the Y-axis direction are shown in FIG.
2, the side surfaces 16G facing each other in the X-axis direction are sliding surfaces for the Y-axis guides 15 as shown in FIG. The slider 16 is guided by the X-axis guides 14 in the X-axis direction with respect to the orbiting scroll 7, and is also guided by the Y-axis guides 15 in the Y-axis direction with respect to the casing 1.

Reference numerals 18, 18 ... Show a plurality of spheres inserted into the through holes 16C of the slider 16, respectively.
Is formed as a spherical ball from a wear-resistant metal material such as stainless steel, bearing steel or tool steel, preferably a hard metal material having a Rockwell C hardness of 55 or more, the diameter of which depends on the axial dimension of each through hole 16C. Is also slightly larger.

In addition, as shown in FIG.
A lubricant holder 19, which will be described later, is slidably mounted on the outer peripheral side, and the outer peripheral surface of the lubricant holder 19 is exposed to the outside as a rolling surface 18A. Each rolling surface 18A of the sphere 18 has a sliding surface 12 on the casing 1 side (support 12).
By making rolling contact with A and the sliding surface 7D of the orbiting scroll 7, the thrusting force from the orbiting scroll 7 side is received, and the orbiting scroll 7 and the slider 16 are moved along the X-axis. , Smooth sliding displacement in the Y-axis direction is compensated.

Reference numerals 19, 19, ... Show the lubricant holders according to the present embodiment, and each of the lubricant holders 19 is made of, for example, a fluororesin such as polytetrafluoroethylene, polyphenylene sulfide resin, or a polyimide resin harder than these. Is formed in a substantially annular shape from a heat resistant resin material such as
Each sphere 18 is located in each through hole 16C of the slider 16.
Is installed so as to surround the outside.

As shown in FIG. 4, each lubricant holder 19 is formed in a tubular shape having an inner diameter larger than the outer diameter of the sphere 18 and an axial dimension smaller than each through hole 16C of the slider 16. The cylindrical portion 19A is provided with the spherical body 18 inside, and annular lid portions 19B and 19B fitted to the inner circumferences of both ends of the cylindrical portion 19A so as to cover the inside of the cylindrical portion 19A. As shown in FIG. 5, engagement protrusions 20, 20 forming a protrusion 21 are formed so as to project radially outward from the diametrical position of the tubular portion 19A on the outer peripheral side thereof.

Further, a sliding contact hole 19C is formed in the center of each lid 19B so as to be in sliding contact with the outer peripheral surface of the spherical body 18, and the peripheral wall surface of each sliding contact hole 19C has a spherical shape corresponding to the outer peripheral surface of the spherical body 18. It has a concave curved surface. Then, each lubricant holder 19 is slidably attached to the outside of the sphere 18 through the slide contact hole 19C of each lid 19B, and each sliding surface 12A on the casing 1 side and the orbiting scroll 7 side, It is inserted into the through hole 16C of the slider 16 while maintaining a gap between it and 7D.

Here, the cylindrical portion 19A of each lubricant holder 19
An annular space is formed inside the space between the spherical body 18 and the space, and a lubricant such as grease G is stored in the space. Then, when the spherical body 18 slides (rolls) on the lubricant holder 19, the grease G passes through the slight gap formed between the sliding contact hole 19C of the lid portion 19B and the spherical body 18. Is supplied to the rolling surface 18A in the direction of arrow A.

Reference numeral 21 denotes a protrusion provided between the through hole 16C of the slider 16 and the lubricant holder 19, and the protrusion 21 is formed in the through hole 16C as shown in FIG. The engaging protrusions 17 and the engaging protrusions 20 projecting from the outer peripheral side of the lubricant holder 19 are included. Then, the protrusion 21 causes the lubricant holder 19 to rotate in the direction of arrow B in FIG. 5 in each through hole 16C of the slider 16 as the sphere 18 rolls. 20 is engaged with each engaging protrusion 17 in the circumferential direction to regulate the engaging protrusion 17.

The scroll type air compressor according to this embodiment has the above-mentioned construction, and its operation will be described below.

First, when the drive shaft 3 is rotated by driving the drive source, this rotation is transmitted to the orbiting scroll 7 via the crank 3A. As a result, the orbiting scroll 7 orbits with respect to the fixed scroll 2, and sequentially compresses the outside air sucked from the suction port 10 along with the orbiting motion, and sends it from the outer peripheral side toward the compression chamber 9 on the center side, and finally. The compressed air is discharged from the discharge port 11 to the outside.

When the orbiting scroll 7 makes an orbiting motion in this manner, the X-axis guide 14 and the Y-axis guide 15
The rotation prevention mechanism 13 including the slider 16 and the like prevents the orbiting scroll 7 from rotating, so that the orbiting scroll 7 makes a circular motion about the drive shaft 3 with a given radius δ.

That is, while the orbiting scroll 7 orbits with respect to the fixed scroll 2, the slider 16 is provided with Y sides each having side surfaces 16G facing each other in the X-axis direction on the casing 1 side.
Since the slider 1 is slidably displaced along the shaft guide 15, the slider 1
6 is slidably displaced in the Y-axis direction while being restricted from moving in the X-axis direction with respect to the casing 1. Further, since the side surfaces 16F facing each other in the Y-axis direction are slidably displaced along the X-axis guides 14 provided on the sliding surface 7D side of the orbiting scroll 7,
The orbiting scroll 7 is slidably displaced in the X-axis direction while being restricted from being displaced in the Y-axis direction with respect to the slider 16.

Further, each sphere 18 is sandwiched between the sliding surface 12A on the casing 1 side (each bearing 12) and the sliding surface 7D of the orbiting scroll 7 via each rolling surface 18A, While receiving the load in the thrust direction from the orbiting scroll 7, each rolling surface 18A rolls on the sliding surfaces 12A and 7D so as to draw a relative circular trajectory as the orbiting scroll 7 orbits. Therefore, the slider 16 has a sliding surface 1
Without causing a large frictional resistance between 2A and 7D,
Sliding displacement occurs between the casing 1 side and the orbiting scroll 7.

On the other hand, since the sphere 18 slides at the position of each slide contact hole 19C with the lubricant holder 19 (each lid portion 19B) as it rolls, the grease G stored in the lubricant holder 19 is , Part of which is gradually melted from the inner peripheral side by the action of frictional heat generated by rolling of the sphere 18 and sliding of the two,
It is supplied in the direction of arrow A to each rolling surface 18A through a slight gap between the spherical body 18 and the hole wall surface of each sliding contact hole 19C, and each rolling surface 18A and the casing 1 side and the orbiting scroll 7 are provided. Lubrication between the side sliding surfaces 12A and 7D is continued for a long period of time.

At this time, the lubricant holder 19 tries to rotate in the direction of arrow B in FIG. 5 in each through hole 16C of the slider 16 as the sphere 18 rolls. The engaging protrusions 20 correspond to the engaging protrusions 1 of the slider 16.
7, the lubricant holder 19 is restricted in its rotation by the engaging protrusions 17 and 20.

Thus, in this embodiment, the slider 16 is slidably disposed between the casing 1 side and the orbiting scroll 7, and each sphere 1 is placed in each through hole 16C of the slider 16.
8 is inserted through the lubricant holder 19, and the grease G is accommodated between the lubricant holder 19 and the sphere 18, the rolling of each sphere 18 is utilized. The grease G in the lubricant holder 19 can be stably supplied little by little between the moving surface 18A and the sliding surfaces 12A, 7D on the casing 1 side and the orbiting scroll 7 side, and each spherical body 18 and the sliding surface 12A, 7D can be smoothly slid over a long period of time, and wear of these can be reliably reduced.

Therefore, the thrust load from the orbiting scroll 7 can be surely continuously received by each of the spheres 18, and the slider 16 and the orbiting scroll 7 can be provided with the slider 16.
Since it can slide smoothly without generating a large frictional resistance between and, by using the lubricant holder 19 having a simple structure, the durability and life of each sphere 18, slider 16 and the like can be greatly extended. The scroll type air compressor can be kept in a good operating condition for a long period of time.

Further, the engaging protrusions 17 and 20 are provided in the through holes 16C of the slider 16 and on the outer peripheral side of the lubricant holder 19, respectively.
Since the protrusions 21 are formed, the rotation of the lubricant holder 19 due to the rolling of the sphere 18 can be reliably suppressed, and the sphere 18 and the lubricant holder 19 can be sufficiently slid during the orbiting movement of the orbiting scroll 7. A part of the grease G that can be moved and is melted by the frictional heat generated by this sliding is transferred between the rolling surface 18A of each spherical body 18 and the sliding surface 12A, 7D of the casing 1 side and the orbiting scroll 7. Can be stably supplied to.

Further, since the lubricant holder 19 is made of a heat-resistant resin material, even if the lubricant holder 19 has heat due to the rolling or sliding of the sphere 18, the grease holder 19 causes the grease inside the grease holder 19 to have heat. G can be reliably held, the grease G can be stably supplied to the rolling surface 18A of the spherical body 18, and the lubricant holder 19 can be inserted into the through holes of the slider 16 during the orbiting movement of the orbiting scroll 7. 16
It is possible to reliably prevent the inner peripheral surface C, the casing 1 side, and the sliding surfaces 12A and 7D of the orbiting scroll 7 from colliding with and damaging or abrading them, or abrading them by sliding with the spherical body 18. be able to.

On the other hand, after performing the compression operation for a certain period, for example, the slider 1 is moved above and below the lubricant holder 19.
By reversing in each of the through holes 16C of No. 6, the grease G in the lubricant holder 19 can be utilized more effectively, and the grease G can be stably supplied to the rolling surface 18A side of the spherical body 18.

Therefore, the grease G can be supplied to the spheres 18 and the like for a long period of time by a simple operation without replacing the lubricant holder 19 at an early stage or frequently replenishing the grease G therein. Furthermore, when the grease G in the lubricant holder 19 is used up, the grease G can be replenished by simply replacing the lubricant holder 19, and the maintainability of the lubricant holder 19 and the like can be reliably improved. .

In the above embodiment, the engaging projections 1 are provided between the through hole 16C of the slider 16 and the lubricant holder 19.
Although the configuration in which the rotation of the lubricant holder 19 is restricted by projecting 7 and 20 respectively, the present invention is not limited to this, and a concave portion and a convex portion are formed in both, and the concave portion and the convex portion are formed. It may be configured to engage with.

In the above embodiment, the scroll type air compressor has been described as an example of the scroll type fluid machine, but the present invention is not limited to this, and is widely applied to, for example, a vacuum pump, a refrigerant compressor and the like. be able to.

[0057]

As described in detail above, according to the first aspect of the present invention, the slider is slidably disposed between the casing and the rear side of the orbiting scroll, and the through holes are formed in the through holes of the slider. Since each sphere is inserted, and a lubricant holder containing a lubricant is provided inside the sphere, the sphere is inserted between the sphere and the casing side and the back side of the orbiting scroll. It is possible to stably supply the lubricant in the lubricant holder little by little by utilizing the rolling of the sphere, and to smoothly slide each sphere and the casing side and the back side of the orbiting scroll for a long period of time. It is possible to significantly reduce the wear. Therefore, each sphere can reliably continue to receive the thrust load from the orbiting scroll, and the slider can smoothly slide between the casing side and the orbiting scroll, so that a lubricant holder with a simple structure should be used. As a result, the durability and life of each sphere, slider, etc. can be significantly extended, and the scroll fluid machine can be kept in a good operating state for a long period of time.

Further, according to the second aspect of the invention, since the protrusion is provided between the through hole of the slider and the lubricant holder, the rotation of the lubricant holder due to the rolling of the sphere is surely suppressed. At the same time, the sphere and the lubricant holder can be sufficiently slid during the orbiting motion of the orbiting scroll, and the friction heat generated by this sliding is used to partially remove the lubricant from the sphere and the casing side. It can be stably supplied to the orbiting scroll.

Further, according to the invention of claim 3,
Since the lubricant holder is made of a heat-resistant resin material, even if the lubricant holder has heat due to rolling or sliding of the sphere, the lubricant holder can reliably hold the internal lubricant and can rotate. Make sure that the lubricant holder does not collide with the inner surface of the through hole of the slider, the casing side, or the back side of the orbiting scroll and damage or wear them or the sphere during the orbiting movement of the scroll. Can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a scroll type air compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken in the direction of arrows II-II in FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view of main parts of FIG. 1 showing a sphere, a lubricant holder, and the like.

5 is an enlarged view of an essential part of FIG. 2 showing a sphere inserted into a through hole of a slider and a lubricant holder together with a protrusion and the like.

[Explanation of symbols]

 1 Casing 2 Fixed scroll 3 Drive shaft 3A Crank 7 Orbiting scroll 7D Sliding surface (rear surface) 9 Compression chamber 12 Bearing 12A Sliding surface 13 Rotation prevention mechanism 14 X-axis guide 15 Y-axis guide 16 Slider 16C Through hole 16D, 16E Sliding surface 17,20 Engagement convex part 18 Sphere 19 Lubricant holder 21 Protrusion part G Grease (lubricant)

Claims (3)

[Claims] 1. A casing, a fixed scroll integrally provided in the casing, and a orbiting scroll which is provided to be rotatable with respect to the fixed scroll and defines a plurality of compression chambers between the fixed scroll. In the scroll fluid machine consisting of, a plurality of through holes that are slidably arranged between the casing and the back side of the orbiting scroll and that are spaced apart in the circumferential direction of the orbiting scroll and that extend in the thrust direction are provided. And a slider, which is inserted into each through hole of the slider and is rollably disposed between the casing side and the rear side of the orbiting scroll so as to receive the load in the thrust direction from the orbiting scroll. A plurality of spheres and a plurality of lubricant holders which are located in the through holes of the slider, surround the spheres from the outside, and supply the lubricant contained in the spheres to the spheres. Scroll fluid machine which is characterized in that a configuration including and. 2. A protrusion for restricting rotation of the lubricant holder in the through hole of the slider is provided between the through hole of the slider and the lubricant holder.
The scroll type fluid machine described in. 3. The scroll fluid machine according to claim 1, wherein the lubricant holder is made of a heat resistant resin material.