JPS58117379A - Scroll compressor - Google Patents

Abstract

PURPOSE:To simplify the structure of a scroll compressor and to attain stable operation of the same, by providing a partition member for closing a clearance formed inevitably between an oscillating scroll and a shell. CONSTITUTION:Lubricating oil drawn up from an oil passage 15 formed in a crank shaft 14 is supplied to a main bearing 17 and an oscillating bearing 16 and then supplied to a thrust bearing 9. Thereafter, the lubricating oil is carried into a Oldham chamber 12. Here, since the Oldham chamber 12 and a suction area 6 of the compressor are separated from each other by a ring 27, the amount of lubricating oil carried into the suction area 6 can be reduced extremely. The small amount of oil carried into the suction area 6 is necessary for the sealing of a compression chamber 5. By selecting the clearance between the Oldham chamber 12 and the suction area 6 appropriately, it is enabled to control the amount of oil carried into the suction area 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for treating oil flowing from a thrust bearing part of a scroll compressor into a suction part of a compression chamber.

Before entering into the description of this invention, the principle of the scroll pruning machine will be briefly described.

The basic elements of the scroll pressure machine are shown in Figure 1. In the figure, (1) is a fixed scroll, (2) is an oscillating scroll, and (5) is a fixed scroll (1) and an opening scroll (2). This is a compression chamber consisting of a gap between Also (0)
is the center of the fixed scroll fi+. The fixed scroll (1) and the oscillating scroll (2) have the same shape and have spirals with opposite directions, and the shape of this spiral is a combination of involutes or circular arcs. A compression chamber (5) is created between both spirals by combining
is formed.

Next, the operation will be explained. In Fig. 1, the fixed scroll (1) is stationary with respect to space, and the swinging scroll (2) is combined with the fixed scroll (υ) as shown in the figure, so that its attitude does not change with respect to space, i.e. ,
A rotational movement, that is, a swinging movement, is performed around the center (0) of the fixed scroll (I+) without causing rotational movement, and as shown in Fig. 1 (
Exercise as shown in a), (b), (C), (d), and (e). With this movement of the oscillating scroll (2), the compression chamber (5) gradually reduces its volume, and the compression chamber (5) gradually decreases in volume from the outer periphery.
5) is compressed to near the center of the fixed scroll (1) and discharged.

Next, a specific example of a conventional scroll compressor will be explained in the second section.
This will be explained using figures.

FIG. 2 shows a specific embodiment in which scroll compression is applied to, for example, refrigeration, air conditioning, or an air compressor, and is configured as a compressor for a gas such as fluorocarbon. In the figure, (1) is a fixed scroll, and (la) is a base plate of the fixed scroll (1), which also serves as a part of a shell to be described later.

(The second one is an oscillating scroll, (3) is an oscillating scroll (phantom base plate, with a radial groove (8a) on the back. (4)
is the fibrillating scroll shaft, (5) is the compression chamber, (6) is the suction part of the compression chamber (5), (7) is the suction hole, (8) is the discharge hole, (
9 is a thrust bearing that supports the back of the base plate (3) of the fibrillating scroll (2), 0q is a bearing support fixed to the fixed scroll (1) with a bolt, and 0 is an oscillating scroll (2).
It is a ring-shaped Oldham joint that prevents rotation and swings, and has protrusions (lla) arranged in a cross shape on the lower surface of the J-
(llb), 02 is the Oldham chamber formed between the base plate (3) of the 'aitj scroll (2) and the bearing support 4, 03
is a bearing support, an oil return hole that connects the Oldham chamber α part opened in the QO and the motor chamber, which will be described later, and a< is an oscillating scroll (2
), aQ is an oil hole eccentrically drilled in the crankshaft O →, and 0 o'clock is an oil hole eccentrically drilled in the crankshaft aΦ, and the oil hole 1 is fitted with the oscillating scroll shaft (4).
Dynamic bearing, 0η is the crankshaft (main bearing that fits with the upper part of 14), 0η is the crankshaft (motor side bearing that fits with the lower part of 1), OI is the motor stator, (7) is the motor rotor, e → is the first balance fixed to the crankshaft a< at the top of the motor/rotor (7), 歞 is the second balance fixed to the bottom end of the motor/rotor (A), and ■ is the fixed scroll (]
), a shell that fixes the bearing support OIJ % morada stator and the motor side bearing (g) and seals the entire compressor, the (Foundation) is the oil stored in the oil sump at the bottom of the shell, (
2) is a motor chamber that houses the motor/stator 01, the motor/rotor blade, and the like.

The operation of the scroll compressor configured in this way will be explained. When the motor/stator is energized, the motor/rotor (1) generates a torque and rotates together with the crankshaft cI→. When the crankshaft α starts to rotate, the co-rotating force is transmitted to the oscillating scroll shaft (4) which is coupled to the fibrillation bearing α→ provided on the crankshaft 04, and the oscillating scroll ( 2) is guided by Oldham's joint 0]) to perform a fibrillating motion and perform a compression action as shown in FIG. Gas flows from the suction hole (7) to the oscillating scroll (2)
It is sucked into the suction part (6) on the outer periphery and taken into the compression chamber (5), and as the crankshaft (DI) rotates, it is sent inward one by one and the discharge pipe (8) provided in the center of the fixed scroll (11) is drawn into the compression chamber (5). more discharged.

Next, the oil supply system will be explained. The oil (c) accumulated at the bottom of the motor chamber (in the motor chamber) is sucked up from the lower end of the crankshaft Q4 as shown by the real pole arrow in the figure by the pumping action of the oil hole 0→ which is eccentrically drilled in the crankshaft 04. , oil hole 05
After passing through, it is supplied to the main bearing 0η and the rocking bearing α peak, and after passing through there, it is supplied to the thrust bearing (9) to lubricate the thrust bearing surface, and after that, it is discharged into the Oldham chamber (2). The oil that enters the Oldham chamber is returned to the bottom oil sump through the oil return hole (to the shell) and the motor chamber (to the shell).

Note that the oscillating motion of the oscillating scroll (2) accompanying the rotation of the crankshaft a41 attempts to cause oscillations in the entire compressor due to unbalanced forces, but the first balance (c) and the second
By balancing, it is possible to statically and dynamically balance around the crankshaft a, and the compressor can be operated without abnormal vibration.

In the conventional scroll compressor configured as described above, as shown in FIG. A gap (12a) is formed and the Oldham chamber (2
) and the suction chamber (6) form a communicating section. Therefore, it is discharged from the bearing surface of the thrust bearing (9), and the Oldham chamber (2)
A part of the oil accumulated in is returned to the motor chamber (c) through the oil return hole α$, but the rest is sucked up by the suction gas into the suction part (6) and taken into the compression chamber (5) as it is. It was being discharged from the discharge hole (3). Normally, in a scroll compressor, some oil is mixed into the suction gas, and the oil seals between both spirals to seal the compression chamber (5). If necessary oil is mixed into the refrigerant when used for refrigeration or air conditioning, a large amount of oil will be mixed into the refrigerant, which tends to cause the problem of insufficient cooling capacity. Furthermore, if oil in the refrigerant is to be removed, it is necessary to install an extra treasure such as an oil separator on the discharge side of the compression chamber (5), which is disadvantageous in terms of cost. Furthermore, if a large amount of oil gets mixed into the suction gas, the motor room (c)
As the amount of oil returned to the engine is insufficient, the amount of oil in the oil reservoir at the bottom of the shell (c) decreases, eventually making it impossible to lubricate each bearing, making stable operation impossible.

This invention was made in view of the above-mentioned drawbacks.
? A: A partition member is provided to close the gap inevitably formed between the moving scroll and the shell, and the oil after lubricating the thrust bearing is restricted from being sucked into the suction part of the compression chamber more than necessary. The present invention aims to provide a scroll compressor with a simple structure and stable operation.

An embodiment of the present invention will be described below with reference to FIGS. 8 and 4. In these figures, (e) is the bearing support QC
) is a ring fitted into the groove (e).弼 is the cut part of the ring (goods), and 翰 are the holes provided at both ends of the cut part (c). In addition,
In these figures, the same or corresponding parts as in FIG. 2 are designated by the same reference numerals as in FIG. 2, and their explanation will be omitted.

In such a configuration, when installing the ring (A), insert the installation tool (not shown) into the both holes and attach the ring (A).
Insert the outer periphery of the ring (A) into the groove (A) by compressing it, and remove the mounting tool (not shown) from the two holes. installed inside. Then, the base of the oscillating scroll (2) is attached to another protrusion f'fl (llb) of the Oldham joint αη fixed in the Oldham chamber α by the protrusion (lla) inserted into the groove (10a) of the bearing support On. The groove (8a) on the back surface of the plate (3) is inserted, and the Oldham joint 0]) and the oscillating scroll (2) are assembled. In this state, the back surface of the oscillating scroll (2) is supported by the thrust bearing (9), and a minute gap is formed between it and the ring. The ring width of the ring (b) is made wider than the maximum gap formed between the swinging scroll (2) and the bearing support OI when the swinging scroll (2) fibrils. The gap 0 pier is in a closed state. Therefore, crankshaft α
The oil sucked up from the oil hole αQ in 6) is the same as before. However, since the oil accumulated in the Oldham chamber α'4 was partitioned by a ring between the Oldham chamber and the suction section (6), the inflow of oil into the suction section (6) was extremely limited. Most of the oil flows down into the oil sump at the bottom of the shell (C). And the ring gradient and swinging scroll (
2) through the small gap between the back plate (3) and the suction part (6).
) is the amount necessary to seal the compression chamber (5), and by appropriately selecting this gap, the amount of oil flowing into the suction part (6) can be adjusted. .

FIGS. 5 and 6 show other embodiments of the present invention, (26
') is a stepped part provided on the inner periphery of the bearing support frame, and (27') is a ring that is fitted and fixed to the stepped part (26') from above. It has a similar effect. Also, the ring @ (27') may be directly fixed to the shell (g), in short, the gap that is inevitably formed between the oscillating scroll and the shell! A partition member such as a ring (27') may be provided so as to be connected.

As described above, according to the present invention, after the thrust bearing lubricates, the oil that flows into the suction part of the compression chamber and gets mixed in during cooling can be limited to 1, and all remaining oil is kept at the bottom of the shell. Returned to Aburama.

Therefore, there is no problem of insufficient cooling capacity,
In addition, there is no need to install extra treasures such as an oil separator on the discharge side, and the amount of oil inside the compressor does not decrease in a short period of time, making it possible to provide a scroll compressor with high purity. can.

[Brief explanation of drawings]

11 is a diagram showing the original operation of a scroll compressor, FIG. 2 is a sectional view of a conventional scroll compressor, FIG. 3 is a partial sectional view showing an embodiment of the present invention, and FIG. 4 is a main part of the present invention. FIG. 6 is a partially exploded perspective view showing another embodiment of the present invention, and FIG. 6 is a partially exploded perspective view thereof. In addition, in the drawings, the same reference numerals indicate the same or A1" corresponding parts. In the figure, (1) is a fixed scroll, (2) is an oscillating scroll, (5) is a compression chamber, (6) is a suction part, (9) is a thrust bearing arm supported by a bearing, αυ is an Oldham joint, and @ is a Oldham room, (2) is oil return hole, α history is crankshaft, threat is shell, (c) is oil. Agent Shin Kuzuno - Figure 1 (0) (b) Figure 2 Figure 3 Figure 5-479- Figure 6

Claims (1)

[Claims] A fixed scroll and an oscillating scroll each having a volute, and when these volutes are combined with each other, form a compression chamber between the two volutes, the oscillating scroll is oscillated and fluid is sucked into the compression chamber. an Oldham joint and a crankshaft that compresses the fluid; a thrust bearing that supports the back surface of the oscillating scroll; a shell that fixes the fixed scroll and houses the Oldham joint, the crankshaft, and the thrust bearing; a bottom portion of the shell; a lubricating means for supplying oil stored in the to the thrust bearing surface, provided to close a gap formed between the oscillating scroll and the shell, and after lubricating the thrust bearing surface;
A scroll compressor comprising a partition member that limits the amount of oil flowing into the suction section of the compression chamber through the gap.