JP2000291574A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hydraulic fluid from degrading in the early stage by cooling hydraulic fluid to be returned back to an oil tank after lubricating sliding portions, and thereby prolong the service life of sliding portion. SOLUTION: This machinery so constituted that a lubricant outflow passage 26 permitting lubricant 3 to be fed to a roller bearing 11 acting as a turning bearing by means of a lubricant feeding mechanism 22, is provided for a drive shaft 6, and outside air is circulated around the circumference of the baring cylindrical part 1C of a casing 1 by means of a cooling fan 17. Since the lubricant 3, flowing out to the bearing cylindrical part 1C from the lubricant outflow passage 26, is cooled by the outside air circulating around the circumference of the bearing cylindrical part 1C, the lubricant 3 can be kept at low temperature, so that the sliding portion such as bearings 7, 8 and 11 can be lubricated and cooled.

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 and a vacuum pump.

[0002]

2. Description of the Related Art In general, a scroll-type fluid machine has a casing in which a lower portion is an oil tank for storing an oil liquid for cooling and lubrication, a thrust receiver is provided on a front side, and a bearing cylinder portion is provided on a rear side. A fixed scroll provided on the front side and having a spiral wrap portion erected on the end plate, a drive shaft extending in the bearing cylinder portion of the casing in the axial direction, and disposed in the bearing cylinder portion of the casing, A bearing that rotatably supports the drive shaft, and is provided rotatably via a swivel bearing on the tip side of the drive shaft in the casing;
A wrap portion overlapping the wrap portion of the fixed scroll is provided upright on the front surface of the end plate, and a revolving scroll in which the back surface of the end plate slides against the thrust receiver; and cooling for cooling the casing by supplying cooling air to the casing. It is roughly configured by a fan.

[0003] Some scroll-type fluid machines are provided with a pump means for supplying an oil liquid accumulated in an oil tank of a casing to a sliding portion such as a swivel bearing (for example, Japanese Patent Application Laid-Open No. HEI-5-1993).
-44402, JP-A-5-44668, etc.).

A scroll type fluid machine according to this type of prior art is provided on the outer peripheral side of a fixed scroll by rotating a drive shaft from the outside and orbiting the orbiting scroll with a fixed eccentricity relative to the fixed scroll. While sucking a fluid such as air from the suction port, the fluid is sequentially compressed in each of the compression chambers defined between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll. The liquid is discharged from the discharge port provided at the outside.

During operation of the scroll-type fluid machine, pump means supplies the oil liquid accumulated in the oil tank of the casing to sliding parts such as a swivel bearing, and cools and lubricates these parts. Further, the oil liquid that has cooled and lubricated each part flows down and returns into the oil tank.

[0006]

According to the above-mentioned scroll type fluid machine according to the prior art, the oil supplied to a sliding portion such as a slewing bearing by the pump means is
Each sliding part is cooled, lubricated, and heated in a state where the temperature of the sliding part rises and returns to the oil tank through a wall surface or the like inside the casing. However, since the wall surface inside the casing has been heated to a high temperature by the compression operation, the oil liquid is returned to the oil tank with the temperature kept rising. Moreover, since a large amount of oil liquid whose temperature has risen is returned to the oil tank, it is difficult to cool the entire oil liquid in the oil tank.

[0007] Therefore, the oil liquid is deteriorated by heat at an early stage, and the lubrication and cooling functions of sliding parts such as bearings are reduced, and the life of these sliding parts is shortened. There is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to cool an oil liquid whose temperature has risen by lubricating a sliding portion while returning to an oil tank. It is an object of the present invention to provide a scroll-type fluid machine capable of preventing the oil liquid from being deteriorated early and extending the life of the sliding portion.

[0009]

A scroll type fluid machine according to the present invention has a casing in which a lower portion is an oil tank for storing an oil liquid for cooling and lubrication, a thrust receiver is provided on a front side, and a bearing cylinder is provided on a rear side. A fixed scroll provided on the front side of the casing and having a spiral wrap portion standing upright on a head plate; a drive shaft extending axially in a bearing barrel portion of the casing; and a bearing barrel of the casing. A bearing arranged rotatably on the front end side of the drive shaft in the casing via a revolving bearing, and a wrap portion of the fixed scroll on a front surface of the end plate. An orbiting scroll in which an overlapping lap portion is erected and the back surface of the end plate slides against the thrust receiver, and a cooling device that cools the casing by supplying cooling air to the casing. Consisting of a fan.

[0010] In order to solve the above-mentioned problems,
The invention according to claim 1 is characterized in that an oil liquid supply means for sucking oil liquid accumulated in an oil tank of a casing from a suction port and supplying the oil liquid to a swivel bearing, and provided on a drive shaft, There is provided an oil liquid outflow passage through which the oil liquid supplied to the slewing bearing by the supply means flows out into the bearing cylinder of the casing.

[0011] With this configuration, the oil liquid supplied to the swing bearing by the oil liquid supply means flows out into the bearing cylinder portion of the casing through the oil liquid outflow passage provided in the drive shaft. The oil flows along the bearing cylinder and is returned to the oil tank. Here, since the cooling fan supplies the cooling air to the casing, the oil liquid flowing along the bearing cylinder can be cooled by the cooling air. In addition, by allowing the oil liquid to flow into the bearing cylinder through the oil liquid outflow passage, the bearing provided in the bearing cylinder can be cooled and lubricated by the oil liquid.

According to the second aspect of the present invention, the oil liquid supply means includes: an oil supply pump provided between the thrust receiver of the casing and the orbiting scroll; a suction passage provided in the casing for sucking the oil liquid in the oil tank; A discharge passage provided in the orbiting scroll and guiding the oil liquid discharged from the oil supply pump to an oil liquid outflow passage.

With this configuration, the oil liquid in the oil tank is sucked from the suction passage to the oil supply pump side and discharged from the oil supply pump to the discharge passage side. It can be guided to the oil liquid outflow passage via the discharge passage.

According to the third aspect of the present invention, the oil liquid outflow passage has an axial passage extending in the axial direction of the drive shaft,
A radial passage extending in the radial direction of the drive shaft in communication with the axial passage.

With this configuration, the oil liquid supplied to the slewing bearing flows through the drive shaft in the axial direction by the axial passage, then flows through the radial passage, and flows out of the opening into the bearing cylinder. Therefore, the oil liquid can flow smoothly in the oil liquid outflow passage.

According to a fourth aspect of the present invention, the intake port of the cooling fan is configured to open around the bearing cylinder of the casing.

With this configuration, when outside air is sucked from the intake port of the cooling fan, the outside air can be positively circulated around the bearing cylinder of the casing.
The oil liquid in the bearing cylinder can be cooled.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 FIGS.

Reference numeral 1 denotes a bottomed cylindrical casing forming an outer frame of the scroll type air compressor, and the casing 1 is disposed horizontally so that the axis is horizontal. Here, the casing 1 includes an annular bottom 1A, a large-diameter cylindrical portion 1B extending frontward from an outer peripheral side of the bottom 1A toward a fixed scroll 5 described later, and a large-diameter cylindrical portion 1B extending from an inner peripheral side of the bottom 1A. A bearing cylinder portion 1C which extends rearward on the opposite side to the diameter cylinder portion 1B and forms a small diameter cylinder portion, and three ribs 1D, 1D,... Provided radially from the outer surface of the bearing cylinder portion 1C. FIG. 3).

An oil tank 2 is integrally provided below the casing 1, and the oil tank 2 forms a substantially rectangular parallelepiped container, in which a lubricating oil 3 as an oil liquid is stored.
Further, a plurality of cooling fins 2A, 2A,... (Only one is shown) are provided at the bottom of the oil tank 2 and project downward and extend forward and backward.

Reference numeral 4 denotes an annular thrust receiver provided on the front side of the large-diameter cylindrical portion 1B of the casing 1. On the inner peripheral side of the thrust receiver 4, an annular recess 4A is formed toward the front side, and the annular recess 4A is formed. Inside, an end plate 10A of the orbiting scroll 10 described later is provided. A sliding contact surface 10 of the orbiting scroll 10 is provided in the annular recess 4 </ b> A of the thrust receiver 4.
An annular sliding contact surface 4B with which the sliding contact D contacts is formed.
B receives a thrust load acting on the orbiting scroll 10.

Reference numeral 5 denotes a fixed scroll provided on the front side of the thrust receiver 4 of the casing 1.
A mirror plate 5A, which is formed in a substantially disk shape and whose center coincides with an axis of a drive shaft 6 to be described later, a spiral wrap portion 5B erected on the mirror plate 5A, and an outer periphery of the mirror plate 5A A cylindrical portion 5C protruding in the axial direction so as to surround the wrap portion 5B from the side, and a flange portion 5D protruding radially outward from the outer peripheral side of the cylindrical portion 5C and abutting against the thrust receiver 4 and attached thereto. It is configured.

Reference numeral 6 denotes a drive shaft extending axially in the bearing cylinder portion 1C of the casing 1. The drive shaft 6 is rotatably supported by ball bearings 7, 8 described later, and has a base end side. A pulley 16, which will be described later, is attached thereto, and a distal end side thereof is connected to the orbiting scroll 10 in the casing 1 as a crank 6A. The axis of the crank 6A of the drive shaft 6 is eccentric with respect to the axis of the drive shaft 6 by a predetermined dimension. Further, a lubricating oil outflow passage 26 described later is formed in the drive shaft 6.

Reference numeral 7 denotes a first ball bearing serving as a main bearing provided at the base end of the bearing cylinder 1C of the casing 1, and 8 denotes a bearing cylinder 1
A second ball bearing serving as a sub-bearing provided in a back portion serving as a tip portion of C, wherein the first ball bearing 7 and the second ball bearing 8 are arranged at an interval in the axial direction of the drive shaft 6. ing. Each of the ball bearings 7 and 8 rotatably supports the drive shaft 6.
It is formed as a normal lubricated ball bearing.

Reference numeral 9 denotes a balance weight provided between the bearing cylinder portion 1C of the casing 1 and a boss portion 10C of the orbiting scroll 10 described later and provided on the outer peripheral side of the drive shaft 6. It protrudes radially outward from the shaft 6 to balance the rotation of the drive shaft 6 with respect to the orbiting scroll 10.

Reference numeral 10 denotes an orbiting scroll which is provided in the casing 1 so as to be capable of orbiting in opposition to the fixed scroll 5. The orbiting scroll 10 has a disk-shaped end plate 10A.
And a spiral wrap portion 10B which is provided in the axial direction on the front surface of the end plate 10A. The orbiting scroll 10 has a boss 10C protruding from the center of the rear surface of the end plate 10A.
It is rotatably mounted on the crank 6A of the drive shaft 6 by a roller bearing 11 as a turning bearing housed in the boss 10C. The front surface of the end plate 10A is in sliding contact with the flange portion 5D of the fixed scroll 5, and the rear surface (back surface) is in sliding contact with the thrust receiver 4.
D.

Here, the orbiting scroll 10 is disposed so as to overlap with the wrap portion 5B of the fixed scroll 5 by, for example, 180 degrees, and both wrap portions 5B,
A plurality of compression chambers 12, 12,... Are defined between 10B. An Oldham coupling (not shown) constituting a rotation preventing mechanism is provided between the orbiting scroll 10 and the thrust receiver 4.
This prevents 0 from rotating.

During operation of the scroll type air compressor, air is sucked into a compression chamber 12 on the outer peripheral side from a suction port (not shown) provided on the outer peripheral side of the fixed scroll 5.
This air is sequentially compressed in each compression chamber 12 while the orbiting scroll 10 makes a revolving motion, and finally compressed air is supplied from the center compression chamber 12 to the outside through a discharge port 13 provided at the center of the fixed scroll 5. Discharge.

Numeral 14 denotes a strainer housing section defined by being connected to the bottom side of the oil tank 2, and 15 denotes a strainer housed in the strainer housing section 14, and the strainer 15 is a lubricating oil sucked from the oil tank 2. The foreign matter mixed in the oil 3 is removed, and the clean lubricating oil 3 is supplied to the oil supply pump 25 described later.

Reference numeral 16 denotes a pulley attached to the base end of the drive shaft 6, and the pulley 16 is connected to a drive motor (neither is shown) through a V-belt. Further, a cooling fan 17 described later is attached to the pulley 16 so as to rotate integrally.

Reference numeral 17 denotes a cooling fan attached to the pulley 16. The cooling fan 17 has an intake port 17A whose inner peripheral side opens around the bearing cylinder 1C of the casing 1.
Then, the cooling fan 17 rotates together with the pulley 16, so that an opening 18 </ b> A of a first duct 18 described later is formed.
Is formed as a sirocco fan that discharges the outside air sucked from the intake port 17A through the outer peripheral side.

Numeral 18 denotes a first duct attached to each rib 1D of the casing 1 so as to cover the cooling fan 17, 19
Is a second duct connected to the downstream side of the first duct 18 so as to cover the bottom side of the oil tank 2, and 20 is a second duct 10
A third duct 21 connected to the downstream side of the third scroll 20 is a fourth duct connected to the downstream side of the third duct 20 so as to cover the front side of the fixed scroll 5. Further, the first duct 18 is formed with an opening 18A that is located on the outer peripheral side of the bearing cylinder 1C and that sucks outside air. As a result, the outside air sucked from the opening 18A of the first duct 18 flows through the ducts 18, 19, 20, 21 and is supplied to the casing 1 and the fixed scroll 5 as cooling air.

Reference numeral 22 denotes a lubricating oil supply mechanism as an oil liquid supply means.
It is roughly constituted by the discharge passage 24, the oil supply pump 25, and the like.

Reference numeral 23 denotes a suction passage formed in the radial direction of the thrust receiver 4. One end of the suction passage 23 is open to the inner peripheral surface of the strainer accommodating portion 14, and the other end is an oil supply pump 25.
Is connected to the suction chamber A.

Reference numeral 24 denotes the end plate 1 of the orbiting scroll 10.
0A in the radial direction, the discharge passage 24
Has one end communicating with the discharge chamber B via an oil reservoir 25G of the oil supply pump 25, and the other end having a sliding contact surface 4B of the thrust receiver 4.
The sliding contact surface 10D is in contact with the sliding surface 10D. The intermediate position of the discharge passage 24 is located at the boss 10 of the orbiting scroll 10.
It is open in C. The discharge passage 24 transfers the lubricating oil 3 discharged from the oil supply pump 25 between the sliding contact surface 4B of the thrust receiver 4 and the sliding contact surface 10D of the orbiting scroll 10, the roller bearing 11 in the boss 10C, and the like. Is supplied to the sliding portion of the motor.

Reference numeral 25 denotes a thrust receiver 4 and an orbiting scroll 1
0, the refueling pump 25 includes, as shown in FIG. 2, for example, a swivel housing recess 25A recessed on the sliding contact surface 4B side of the thrust receiver 4; A concave recess 25B which is spaced from the swivel accommodating recess 25A on the sliding contact surface 4B side of the thrust receiver 4;
A guide groove 25C provided on the side of the sliding contact surface 4B located between B and the swirler housing recess 25A, and protruding from the sliding contact surface 10D of the orbiting scroll 10 toward the swirler housing recess 25A. A revolving element 25D, a driving projection 25E protruding from the sliding contact surface 10D of the revolving scroll 10 toward the recess 25B, and a slide plate 25F slidably provided in the guide groove 25C. It is roughly configured. In addition, both ends of the slide plate 25F have the swivel 2
5D and the drive projection 25E are slidably contacted with each other.
A and the suction chamber A communicating with the suction passage 23 and the discharge passage 24.
And a discharge chamber B communicating with the discharge chamber B.

The refueling pump 25 is connected to the swirler 2
5D, the drive projection 25E moves following the orbiting scroll 10, and the slide plate 25F moves along with the guide groove 25C.
The suction chamber A and the discharge chamber B are guided along
Are enlarged and reduced, respectively, and the suction chamber A
The lubricating oil 3 sucked into the inside is discharged from the discharge chamber B to the discharge passage 24 via the oil reservoir 25G, and is supplied to the sliding contact surfaces 4B and 10D, the roller bearing 11, and the like.

Reference numeral 26 denotes a lubricating oil outflow passage provided as an oil liquid outflow passage provided in the drive shaft 6.
One axial passage 26A is provided extending in the axial direction from the center of the drive shaft 6, and the drive shaft 6 is located between the ball bearings 7, 8.
The base end side is provided with the axial passage 26.
A and a plurality of radial passages 26B, 26B,... As shown in FIG. 3, four radial passages 26B are provided at intervals of approximately 90 degrees in the circumferential direction.

The lubricating oil outflow passage 26 supplies the lubricating oil 3 supplied from the discharge passage 24 of the lubricating oil supply mechanism 22 into the boss portion 10C of the orbiting scroll 10 in order to supply the lubricating oil 3 to the roller bearings 11. The oil 3 flows through the axial passage 26A, and flows out from each radial passage 26B into the bearing cylinder 1C.

Reference numeral 27 denotes an oil return passage provided in the bearing cylinder 1C of the casing 1 located near the lower side of the first ball bearing 7, and the oil return passage 27 is provided with a lubrication provided in the drive shaft 6. The lubricating oil 3 flowing out of the oil outflow passage 26 into the bearing cylinder 1C flows down to the oil tank 2 and is positively returned to the oil tank 2.

The scroll type air compressor according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

First, when the drive shaft 6 is rotated by the drive motor, the orbiting scroll 10 makes a orbital motion with a certain eccentric dimension about the drive shaft 6, and the wrap portion 5 B of the fixed scroll 5 and the orbiting scroll 10 Part 10
., B are continuously reduced. Thus, the outside air sucked from the suction port of the fixed scroll 5 is discharged from the discharge port 13 to an external air tank (not shown) or the like while being sequentially compressed in each compression chamber 12.

During operation of the scroll type air compressor, the oil supply pump 25 is operated to suck the lubricating oil 3 in the oil tank 2 into the suction passage 23 via the strainer 15 and to slide the thrust receiver 4 from the discharge passage 24. It is supplied between the surface 4B and the sliding contact surface 10D of the orbiting scroll 10 toward the roller bearing 11 and the like in the boss 10C. And the sliding contact surfaces 4B, 10D
The lubricating oil 3 that has cooled and lubricated the space flows out from the gap between the sliding surfaces 4B and 10D, and is returned into the oil tank 2.

The lubricating oil 3 supplied to the roller bearing 11
The lubricating oil 3 that has cooled and lubricated the roller bearings 11 flows out into the bearing cylinder 1C of the casing 1 through a lubricating oil outflow passage 26 provided in the drive shaft 6, as indicated by black arrows, and a part thereof. The lubricating oil 3 is returned to the oil tank 2 after cooling and lubricating the ball bearings 7 and 8 provided in the bearing cylinder 1C, and the other lubricating oil 3 is returned to the oil tank 2 through the oil return passage 27. It is.

Here, during operation of the compressor, cooling air is supplied to the oil tank 2, the fixed scroll 5 and the like by the cooling fan 17 to cool them. At this time, the cooling fan 1
7 draws outside air from the intake port 17A through an opening 18A formed around the bearing cylinder 1C of the casing 1, and therefore, around the bearing cylinder 1C, a hollow arrow in FIG. As shown, air actively flows toward the intake port 17A.

Accordingly, since the lubricating oil 3 flowing out of the lubricating oil outflow passage 26 to the bearing cylinder 1C is cooled by the outside air flowing around the cylinder 1C by the cooling fan 17, the lubricating oil 3 is sufficiently cooled. It is returned to the oil tank 2 in the state where it was done.

Thus, according to the present embodiment, the lubricating oil 3 supplied to the roller bearings 11 in the boss 10C by the lubricating oil supply mechanism 22 is supplied to the drive shaft 6 in the bearing cylinder 1C of the casing 1. Since the lubricating oil outflow passage 26 that flows out is provided and the intake port 17A of the cooling fan 17 is provided so as to open to the casing 1 side, the lubricating oil 3 that has flowed out from the lubricating oil outflow passage 26 to the bearing cylinder 1C is removed. It can be cooled by the outside air flowing toward the cooling fan 17.

As a result, since the cooled lubricating oil 3 can be returned to the oil tank 2, the temperature of the lubricating oil 3 can be maintained at a low level, and deterioration of the lubricating oil 3 can be prevented. In addition, the cooled lubricating oil 3 is applied to sliding portions of the roller bearing 11, the ball bearings 7, 8 and the like in the boss portion 10C between the sliding contact surface 4B of the thrust receiver 4 and the sliding contact surface 10D of the orbiting scroll 10. Can be supplied, the life of these sliding parts can be extended, and the reliability can be improved.

The lubricating oil outflow passage 26 includes an axial passage 26A extending in the axial direction of the drive shaft 6 and an axial passage 26A.
A comprises a radial passage 26B extending in the radial direction of the drive shaft 6 and opening on the peripheral surface of the drive shaft 6, wherein the radial passage 26B has a first ball bearing 7, a second ball bearing 8, The lubricating oil 3 can be efficiently cooled in the bearing cylinder 1C by utilizing the space between the ball bearings 7 and 8.

Further, a second position located at the back of the bearing cylinder 1C is provided.
Since the lubricating oil 3 can be supplied to the ball bearing 8 of this type, the ball bearing 8 does not need to be an expensive oil-free ball bearing having a seal for enclosing the lubricating oil. And the cost can be reduced.

The radial passage 2 of the lubricating oil outflow passage 26
Since a plurality of the lubricating oils 6B are provided apart from each other in the longitudinal direction of the axial passage 26A, the lubricating oil 3 can flow out and spread over the entire inner surface of the bearing cylinder 1C.
Can be efficiently cooled.

On the other hand, since the intake port 17A of the cooling fan 17 is provided so as to open around the bearing cylinder 1C of the casing 1, when the outside air is sucked through the opening 18A of the cooling fan 17, the periphery of the bearing cylinder 1C. Thus, the outside air can be positively circulated, and the lubricating oil 3 in the bearing cylinder 1C can be effectively cooled.

Further, since the oil return passage 27 is provided in the bearing cylinder portion 1C of the casing 1, the lubricating oil 3 flowing out from the lubricating oil outflow passage 26 into the bearing cylinder portion 1C is supplied to the oil return passage 2C.
7, the oil can be returned to the oil tank 2 positively.
Flow can be smooth.

In the embodiment, the lubricating oil outflow passage 2
6, the radial passage 26B is provided at four positions in the longitudinal direction of the axial passage 26A at intervals of 90 degrees. However, the present invention is not limited to this.
The number and diameter of the radial passages 26B can be appropriately set according to the structure of the scroll air compressor, the characteristics of the lubricating oil 3, and the like.

In the embodiment, the cooling fan 17 is configured as a sirocco fan serving as a centrifugal fan, but another fan such as an axial fan may be used.

In the embodiment, the thrust receiver 4 is provided separately from the casing 1. However, the present invention is not limited to this, and the casing and the thrust receiver may be formed integrally.

Further, in the embodiment, the rotary type oil supply pump 25 which discharges the lubricating oil 3 by using the orbiting motion of the orbiting scroll 10 has been exemplified as the oil supply pump 25. The present invention is not limited to the hydraulic pump of the type described above, and a rotary type oil supply pump of the type described in JP-A-5-44402 and JP-A-5-44668 may be used. On the other hand, a lubrication pump may be used that supplies lubrication oil to a lubrication site by applying pressure to the lubrication oil using a part of the compressed air discharged from the compression chamber 12 as the lubrication pump.

Further, in the embodiment, the scroll air compressor has been described as an example of the scroll type fluid machine, but 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.

[0059]

As described in detail above, according to the first aspect of the present invention, the oil liquid supply means for sucking the oil liquid accumulated in the oil tank of the casing from the suction port and supplying the oil liquid to the slewing bearing; An oil liquid outflow passage which is provided on the drive shaft and which allows the oil liquid supplied to the slewing bearing by the oil liquid supply means to flow out into the bearing cylinder of the casing. The supplied oil liquid flows out through the oil liquid outflow passage provided in the drive shaft into the bearing barrel of the casing, and can flow back along the bearing barrel to the oil tank. At this time, the cooling fan supplies the cooling air to the casing, so that the oil liquid flowing along the bearing cylinder can be cooled by the cooling air. As a result, the oil liquid can be returned to the oil tank in a cooled state, and the temperature of the oil liquid can be kept low to prevent the oil liquid from deteriorating. Moreover, since the cooled oil solution can be supplied to the orbit bearing between the thrust receiver and the orbiting scroll, the life of these sliding parts can be extended, and the reliability can be improved.

According to the second aspect of the present invention, the oil supply means includes an oil supply pump provided between the thrust receiver of the casing and the orbiting scroll, and a suction passage provided in the casing for sucking the oil in the oil tank. , Provided in the orbiting scroll, and a discharge passage that guides the oil liquid discharged from the oil supply pump to an oil liquid outflow passage, so that the oil liquid in the oil tank is sucked from the suction passage to the oil supply pump side. The oil can be discharged from the oil supply pump to the discharge passage side, and the oil liquid in the oil tank can be reliably guided to the oil liquid outflow passage via the suction passage and the discharge passage.

According to the third aspect of the present invention, the oil liquid outflow passage has an axial passage extending in the axial direction of the drive shaft,
Since the fluid passage is constituted by a radial passage provided in the axial passage and extending in the radial direction of the drive shaft, the oil liquid supplied to the slewing bearing flows in the drive shaft in the axial direction by the axial passage. After flowing through the oil passage, the oil can flow out of the radial passage into the bearing cylinder, and the oil liquid can smoothly flow through the oil liquid outflow passage.

According to the fourth aspect of the present invention, since the intake port of the cooling fan is configured to open around the bearing cylinder portion of the casing, when outside air is sucked from the intake port of the cooling fan, the bearing cylinder of the casing is opened. The outside air can be positively circulated around the part, and the oil liquid in the bearing cylinder part can be effectively cooled.

[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.

FIG. 2 is an enlarged view of a refueling pump, as indicated by arrows II-II in FIG.
It is the expanded sectional view seen from the direction.

FIG. 3 is an enlarged cross-sectional view showing a bearing cylinder portion, a rib, a drive shaft, a lubricating oil outflow passage, and the like of a casing, as viewed from a direction indicated by arrows III-III in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 1C Bearing cylinder part 2 Oil tank 3 Lubricating oil (oil liquid) 4 Thrust receiver 5 Fixed scroll 5A, 10A End plate 5B, 10B Lapping part 6 Drive shaft 7 First ball bearing 8 Second ball bearing 10 Rotating scroll 11 Roller Bearing (slewing bearing) 17 Cooling fan 17A Inlet 22 Lubricating oil supply mechanism (oil liquid supply means) 23 Suction passage 24 Discharge passage 25 Oil supply pump 26 Lubricating oil outflow passage 26A Axial passage 26B Radial passage

Continued on the front page (72) Inventor Hiroyuki Mihara 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Tokiko Corporation (reference) 3H029 AA02 AA15 AA21 AB06 BB03 BB12 BB44 CC05 CC09 CC16 CC22 CC34 CC47 3H039 AA02 AA04 AA09 AA12 BB11 BB13 CC02 CC12 CC27 CC33 CC34 CC44

Claims (4)

[Claims] 1. A lower part is an oil tank for storing an oil liquid for cooling and lubrication, a casing provided with a thrust receiver on a front side and a bearing cylinder part provided on a rear side, and a spiral provided on a head plate provided on a front side of the casing. A fixed scroll having an upright wrap portion, a drive shaft extending in the axial direction in the bearing tube portion of the casing, and a drive shaft disposed in the bearing tube portion of the casing to rotatably support the drive shaft. And a wrap portion that is rotatably provided at the tip end side of the drive shaft in the casing via a slewing bearing, and a lap portion overlapping the wrap portion of the fixed scroll is provided upright on the front surface of the end plate, and the back surface of the end plate is The scroll-type fluid machine includes a orbiting scroll that is in sliding contact with the thrust receiver, and a cooling fan that cools the casing by supplying cooling air to the casing. An oil liquid supply means for sucking an oil liquid accumulated in an oil tank of the casing from a suction port and supplying the oil liquid toward the slewing bearing; provided on the drive shaft; and supplied to the slewing bearing by the oil liquid supply means. A scroll-type fluid machine, comprising: an oil liquid outflow passage through which an oil liquid flows out into the bearing cylinder portion of the casing. 2. The oil liquid supply means includes: an oil supply pump provided between a thrust receiver of the casing and an orbiting scroll; a suction passage provided in the casing for sucking an oil liquid in the oil tank; Provided on the scroll,
The scroll-type fluid machine according to claim 1, further comprising a discharge passage that guides the oil liquid discharged from the oil supply pump to the oil liquid outflow passage. 3. The oil liquid outflow passage is provided with an axial passage extending in the axial direction of the drive shaft, and a diameter extending in the radial direction of the drive shaft in communication with the axial passage. 3. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine comprises a direction passage. 4. The scroll-type fluid machine according to claim 1, wherein an intake port of the cooling fan is configured to open around a bearing cylinder of the casing.