JPS6223595A - Scroll compressor - Google Patents

Abstract

PURPOSE:To certainly feed lubricating oil onto the slidable surface of the outer peripheral part of a crankshaft by installing an annular ring for closing the gap between the inner periphery of an eccentric hole on a crankshaft and the outer periphery of a bearing bush installed into the eccentric hole, onto the upper surface of the bearing bush. CONSTITUTION:An annular ring 26 for closing the gap between the inner periph ery of the eccentric hole 18 of a crankshaft 9 and the outer periphery of a bearing bush 2 installed in the eccentric hole 18 is installed onto the upper surface of the bearing bush 2. Therefore, almost all the lubricating oil supplied into the bearing sliding part 29 of the eccentric hole 18 of the crankshaft 9 is supplied into a bearing 6 and a sliding part 27 passing through an oil hole 25a, without passing through the gap 18a between the inner periphery of the eccentric hole 18 and the outer periphery of the bearing bush 2, and then sup plied onto the sliding surface of the bearing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor used to compress refrigerant in an air conditioner or refrigerator.

[Conventional technology]

A conventional scroll compressor will be explained with reference to FIGS. 3 to 6.

FIG. 3 shows the basic components and compression principle when a scroll fluid machine is used as a compressor.

In FIG. 3, 1 is a fixed scroll, 4 is an oscillating scroll, 20 is a suction chamber, 22 is a discharge boat, and 21 is a compression chamber. Further, 0 is the center of the fixed scroll 1. The fixed scroll 1 and the oscillating scroll 4 have spirals having the same shape and opposite winding directions, and the shapes of these spirals are, as is conventionally known, S-shaped, such as an impolite curve, a circular arc, or the like.

Next, the operation will be explained. In FIG. 3, the fixed scroll 1 is stationary with respect to space, and the fixed scroll 1 with four oscillating scrolls is assembled with a phase shift of 1800 degrees, and the rotation of the center 0 of the fixed scroll 1 is Performs orbital motion that does not rotate, Figure 3 o', 90°, 180°
, moves like 270°. At state 00 in the figure, gas confinement in the suction chamber 20 is completed and a compression chamber 21 is formed. As the oscillating scroll 4 moves, the compression chamber 21 gradually reduces its volume, and the gas therein is compressed and discharged through a discharge port 22 provided at the center of the fixed scroll 1.

The outline of the device known as a scroll compressor is as above.

FIG. 4 is a longitudinal sectional view showing a conventional Sukhmir pressure wil holly as shown in Japanese Patent Application Laid-Open No. 59-224493. 1 is a fixed scroll, and one fixed scroll spiral 1a is provided protruding from a base plate 1b. Reference numeral 4 designates an oscillating scroll. The oscillating scroll 4 has a spiral 4a protruding from a base plate 4b, and the spirals 1a and 4m are combined with each other. The fixed nuclear scroll 1 is fixed to a bearing support 5 by bolting or the like, and the oscillating scroll 4 has an oscillating scroll shaft 4c provided on the opposite side of the scroll 4a, which is supported by a bearing bush 2 and a bearing 3. The oscillating scroll 4 is connected to the crankshaft 9 via the bearing bush 2, and
It is connected to an anti-rotation mechanism 10 such as an Oldham joint provided between the oscillating scroll 4 and the bearing support 5, and is supported by the bearing support 5 via the bearing 3. The crankshaft 9 has a bearing 6,
7.8, the rotation prevention mechanism 10 prevents the rotation of the swing shaft of the swing scroll 4, and maintains an angular positional relationship with the bearing support 5 so as to swing around the bearing 6. An electric motor rotor 11 is connected to the crankshaft 9 by means such as press-fitting, and the rotor 11 is rotatably fitted to an electric motor stator 12, which is fixed to a bearing support 13. A crankshaft 9 is supported on the bearing 13 via bearings 7 and 8'ff, and the bearing support 13 is fixed to the inner circumferential surface of the shell, that is, the pressure vessel 14, by press fitting or the like. 15 is an oil reservoir provided at the bottom of the pressure vessel 14;
Reference numeral 16 denotes a lid provided at the lower end of the crankshaft 9, and a small hole 16a is provided in the lid 16 extending from the center line of the crankshaft 9. 1γ is an oil supply hole provided in the crankshaft 9, one end of the oil supply hole 17 is opened into the oil reservoir 150, and the other end is connected to the crankshaft 9 that is connected to the swinging scroll shaft 4c.
The bearing sliding portion 18 in the eccentric hole 18 is opened. 1
9 is a gas vent hole, 20 is a suction chamber, 21 is a compression chamber formed by the fixed scroll 1 and the swinging scroll 4,
22 is a discharge boat provided at the center of the fixed scroll 4;
23 is a discharge pipe, and 24 is a suction pipe.

FIG. 5 shows an example of the structure of the eccentric hole 18 of the crankshaft 9 and its oil supply system in a conventional scroll compressor as shown in FIG. In FIG. 5, 25a, 25b
are the oil holes provided in the crankshaft 9 and the bearing bushing 2, and the oil holes 25 m and 25b are the eccentric holes 1 of the crankshaft 9.
The inner peripheral side of the bearing bush 2 of the bearing 6 and the sliding part 29 in the crankshaft 9 is communicated with the bearing sliding part 27 on the outer periphery of the crankshaft 9.

Note that the same reference numerals in FIG. 5 as in FIG. 4 indicate the same parts.

FIG. 6 shows the structure of the eccentric hole 18 when a gap 18& is provided between the inner circumference of the eccentric hole 18 of the crankshaft 9 and the outer circumference of the bearing bush 2. Note that the same reference numerals in FIG. 6 as in FIG. 5 indicate the same or corresponding parts.

Next, the operation of the conventional scroll compressor shown in FIG. 4 will be explained. When the electric motor stator 12 is allowed to pass through, rotational torque is generated in the electric motor rotor 11 and the crankshaft 9 rotates. Then, the oscillating scroll 4 starts to rotate via the bearing bush 2, but since it is prevented from rotating by the automatic prevention mechanism 10 consisting of an Oldham joint, it performs an eccentric revolution movement and is compressed as shown in FIG. 4 and described above. The principle is to completely compress working fluids such as refrigerant gas.

When the compressor is operated in this way, the working fluid gas is sucked from the suction pipe 24 as shown by the arrow in FIG. 4, enters the suction chamber 20, is compressed in the compression chamber 21, and then The high-pressure gas is discharged to the outside of the pressure vessel 14 through the discharge port 22 and the discharge pipe 23. At this time, the motor rotor 11 and the motor stator 12 are cooled by the suction gas. In addition, as shown by the broken line arrow in FIG. 1
Due to the centrifugal pump action of γ, the eccentric hole 1 of the crankshaft 9
After entering the bearing sliding part 29 in 8 and supplying oil to the sliding part of the bearing bushing 2, the bearing 6,
The sliding surface of the sliding portion 2T and the bearing 3 is supplied with oil. In this way, the oil used for lubrication is either bathed on the inner periphery of the pressure vessel 14 or each component and returned to the oil reservoir 15, or mixed with the working fluid gas and sent from the discharge pipe 22 to the pressure vessel 14. It is discharged to the outside.

The oil supplied from the oil supply hole 1T provided in the crankshaft 9 to the bearing sliding part 29 of the eccentric hole 18 of the crankshaft 9 is transferred to the side stone/hole 18 as shown by the phantom line arrow in FIG. The oil hole 25 provided in the bearing bush 2 and the crankshaft 9 passes through the gap between the inner periphery of the bearing bush 2 and the bearing sliding part 29 on the outer periphery of the oscillating scroll shaft 4C of the 971 scroll 4.
b, 2sa, and are fed to the bearing 6 and the sliding part 27 together. After that, the flow toward the sliding surface of the bearing 3 and the bearing sliding portion 29
The flow is divided into two streams that are directly supplied to the sliding surface of the bearing 3 through the gap, and after lubricating the sliding parts of the bearing, the flow is supplied directly to the sliding surface of the bearing 3.
It is leaked inside.

In the conventional scroll compressor configured as above,
The bearing bush 2 that transmits power to the swinging scroll 4 is fixed in an eccentric hole 18 of the crankshaft 9, and for example, the machining accuracy of the spiral shapes of the spirals 1a and 4a of the fixed scroll 1 and the swinging scroll 4 varies. In this case, depending on these values, there is a strong possibility that the spirals 1a and 4a will come into contact with each other, causing the crankshaft 9 to lock and preventing normal operation of the scroll compressor.

Therefore, as shown in FIG. 6, the bearing bush 2 is formed into a cylindrical shape at the center, and there is a gap 18af between it and the inner circumference of the eccentric hole 18 of the crankshaft 9! : A structure formed and arranged was considered. With this structure, the bearing bushing 2 can move in the radial direction within the eccentric hole 18, and even if the fixed scroll 1 and the spirals 1a and 4a of the oscillating scroll 4 come into contact during scroll compression-like operation, The bearing bushing 2 moves in the radial direction of the eccentric hole 18 within the gap 18a,
The crankshaft can rotate 90 times normally.

[Invention is y! ! [Problem to be Solved] However, the eccentric hole 18 portion of the crankshaft 9 is
When a gap tea is provided between the inner periphery of the core hole 18 and the outer periphery of the bearing bush 2, the gap 1B &
needs to be about 50 to 130μ in the radial direction, and if a gap IRg with a value of The gap between the sliding bearing part 29 on the outer periphery of the shaft 4C is formed in the bearing gap. During operation, even if oil is well supplied from the oil supply hole 17 provided in the crankshaft 9 to the bearing sliding part 29 of the eccentric hole 18, most of the oil is transferred to the outer circumferential side of the bearing bush 2 due to the oil passage resistance. The lubricant flows through the gap 18a, resulting in insufficient oil supply to the gap between the inner periphery of the bearing bush 2 and the bearing sliding portion 29 of the oscillating scroll shaft 4c, which tends to cause seizure.

This invention attempts to solve the above problem, and even if the gap between the inner circumference of the crankshaft and the outer circumference of the bearing bushing is large,
The object of the present invention is to provide a scroll compressor that can supply a sufficient amount of oil to the sliding surfaces of the inner periphery of a bearing bush and the outer periphery of an oscillating scroll shaft, and is less likely to seize. [Means for Solving the Problems] The scroll compressor according to the present invention has an annular ring on the upper surface of the bearing bush that closes the gap between the inner periphery of the eccentric hole of the crankshaft and the outer periphery of the bearing bush provided in the eccentric hole. It was established.

[Effect]

In the scroll compressor of this invention, during operation, oil supplied from the oil supply hole of the crankshaft to the bearing sliding part in the eccentric hole passes through the gap between the outer and inner circumferential sides of the bearing bushing, as described above. When the bearing is removed and supplied to the sliding part of the bearing and the sliding surface of the bearing, the gap on the outer periphery of the bearing bushing is closed with the annular ring provided on the top surface of the bushing, so that it is supplied to the sliding part of the bearing in the eccentric hole of the crankshaft. A sufficient amount of oil can be supplied to the gap between the inner periphery of the bearing bush and the orbiting scroll shaft. In other words, a circle is placed on the upper surface of the bearing bushing so that some of the oil that conventionally flowed to the outer circumference of the bearing bushing flows into the sliding part of the oil-based oscillating scroll shaft that is supplied to the bearing sliding part of the eccentric hole. Ring-t IJ song plug oil spill.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view of an eccentric hole portion of a scroll compressor according to an embodiment of the present invention. In FIG. 1, the second ring is an annular ring, and as shown in FIG. 2, a cutoff portion 26a is formed at one location in the circumferential direction. 28 is a ring mounting follower provided on the wall of the eccentric hole 18 of the crankshaft 9;
The bottom surface 28m of the access groove 28 is at the same height as the top surface of the bearing bush 2 provided in the elevation hole 18, and the outer circumference of the annular ring 26 is fitted into the ring attachment groove 28, and the inner circumference is supported on the upper surface of the shaft bushing 2, and the gap 18ak between the inner periphery of the eccentric hole 18 and the outer periphery of the bearing bushing 2 is closed by the ring 26. In addition, the same symbols as in FIG. 6 in Sugar 1 indicate the same or corresponding parts. 1. The structure of this embodiment other than that described above is the same as the conventional one shown in FIG.

In this actual example, the gap 113m between the inner periphery of the eccentric hole 18 of the crankshaft 9 and the outer periphery of the bearing bush 2 is
Since the manual removal ring 26 provided on the top surface is closed, the oil supplied to the bearing sliding part 29 of the eccentric hole 18 of the crankshaft 9 will flow as shown by the broken line arrow in FIG. 1 during operation of the scroll compressor. The flow supplied to the sliding surface of the bearing 3 through the gap between the inner circumference of the bearing bush 2 and the bearing sliding part 29 on the outer circumference of the oscillating scroll shaft 4C, and the gap 18 m between the outer circumference of the bearing bush 2 and the inner circumference of the eccentric hole 18. The bearing 6 of the crankshaft 9 passes through the sleeve hole 25 &
After being supplied to the sliding portion 27, the fluid is divided into flows that reach the sliding surface of the bearing 3 to lubricate the bearing sliding portions 29 and 27, respectively. At this time, the oil flowing through the gap 18& between the inner periphery of the eccentric hole 18 and the outer periphery of the bearing bush 2 cannot flow directly from the gap 18a to the sliding surface of the bearing 3 because the upper surface of the gap 18 is sealed with the annular ring 26. Rather, almost all of it passes through the armhole 25a, is supplied to the bearing 6 and the sliding portion 27, and then is supplied to the sliding surface of the bearing 3.

The gap between the bearing 6 and the sliding part 27 is a bearing gap υ,
The passage area of the gap on the inner periphery of the bearing bush 2 is about five times that of the passage area, and compared to the conventional structure described above, the gap between the inner periphery of the bearing bush 2 and the outer periphery of the oscillating scroll shaft 4C between the bearing 2 and the sliding portion 29 is sufficient. can supply a large amount of oil.

Further, in this embodiment, the annular ring 26 is fitted into the ring mounting groove 28 provided in the wall of the eccentric hole 18 of the crankshaft 9, suppresses the upper surface of the bearing bush 2, and is fixed to the wall of the eccentric hole 18. , it is possible to prevent floating b' of the bearing bushing 2 during operation.

〔Effect of the invention〕

As explained above, according to the present invention, the gap between the inner periphery of the eccentric hole of the crankshaft and the outer periphery of the bearing bushing is closed by the annular ring provided on the upper surface of the bearing bushing. It is possible to sufficiently supply oil to the gap between the bearing sliding parts of the bearing bushing and to prevent damage to the scroll compressor due to seizure at the bearing bushing inner circumference and the bearing sliding part of the oscillating scroll shaft. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an eccentric hole of a crankshaft showing a scroll compressor according to an embodiment of the present invention, FIG. 2 is a perspective view of an annular ring, and FIG. 3 is a diagram explaining the principle of the scroll compressor. Figure 4 is a cross-sectional view of the conventional scroll pressure machine;
This figure is a longitudinal sectional view showing an example of the eccentric hole of the crankshaft, and FIG. 6 is a longitudinal sectional view showing the other side of the eccentric hole of the conventional crankshaft. 1... Fixed scroll, 1a... Spiral, 1b...
Base plate, 2... Bearing bushing, 3... Bearing, 4...
Oscillating scroll, 4a... spiral, 4b... base plate, 4
C... Rocking shaft, roll shaft, 5... Bearing support, 6,
7.8 Bearing, 9 Crankshaft, 10 Anti-rotation mechanism, 11 Motor rotor, 12 Electric motor shaft, 13 Bearing support, 14 ...Pressure vessel, 15...Oil reservoir, 17...Oil supply hole, 18...
Eccentric hole, 18 [... Gap, 21... Compression chamber, 25 m,
25b...oil hole, 26...circular ring, 2T...
・Bearing sliding part, 28...Ring mounting groove, 29...Bearing sliding part. ), the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed scroll and an oscillating scroll that form a compression chamber between the two volutes by forming a compression chamber between the two volutes by protruding from a base plate and combining the volutes with each other, and a crankshaft that transmits driving force to the oscillating scroll. a bearing support having a bearing for smoothly rotating the crankshaft; an automatic prevention mechanism for maintaining the angular positional relationship between the oscillating scroll and the bearing support; a bearing bush into which an oscillating scroll provided on the opposite side of the volute of the oscillating scroll is fitted with a suitable gap; an electric motor connected to the other end of the crankshaft to provide driving force to the crankshaft; It is formed by a pressure vessel housing each part, an oil reservoir provided at the bottom of this pressure vessel, an oil pump provided on the crankshaft whose tip is immersed in the oil of this oil reservoir, and an oil supply hole. A scroll compressor equipped with the above-mentioned bearing bush and an oil supply path for supplying oil to the bearing section, characterized in that an annular ring that closes the gap between the outer periphery of the bearing bush and the inner periphery of the eccentric hole is disposed on the upper surface of the bearing bush. Machine.