JPS60201091A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent seizure and abrasion of a sliding support surface for an oscillating scroll by a method wherein mesh-like surface hardnening section is provided at the oscillating scrol side of contacting surfaces between the oscillating scroll and a thrust bearing which supports the same scroll from the lower surface side thereof. CONSTITUTION:The concentrical and radial hardening sections A1, A2, which are hardened by quenching, are formed on the lower surface 20b of a table board 2b of the oscillating scroll 2 so as to be intersected to form a mesh- like configuration. Only the portions of the outer peripheral surface 20C of an oscillating scroll shaft 2c and the side surfaces of the key groove 2d of oscillating scroll, whereat bias abutments are easily caused, are quenched. As a result, seizure and abrasion in the contacting surfaces between the thrust bearing and the oscillating scrool may be prevented and, further, the strain deformation of members, accompanied by the quenching, may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Four Fields of Interest of the Invention] The present invention relates to a scroll compressor used in air conditioning or low-temperature refrigeration units.

[Prior art]

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

Figure 1 shows the basic components and compression principle when a scroll fluid machine is used as a compressor. In the figure, (1) is a fixed scroll, (2) is an oscillating scroll, and (3) is a fixed scroll. is a suction chamber, (4) is a discharge port, and (5) is a compression chamber. Further, 0 is the center of the fixed scroll (1).

The fixed scroll (1) and the oscillating scroll (2) have spirals (1aX2a) having the same shape and opposite winding directions, and the shape of these spirals (1aX2a) is an involute curve, as is conventionally known. It is composed of 9 arcs, etc.

Next, the operation will be explained. The fixed scroll (!n) above is stationary with respect to space, and the oscillating scroll (2)
are assembled with a phase shift of 180° with respect to the fixed scroll (1), and perform an orbital motion that does not rotate around the center 0 of the fixed scroll (1).
As shown in (d): 0', IX)', 180°, 27
Move like 0°. In the figure, 0° as shown in Figure 1(a)
In this state, gas confinement in the suction chamber (3) is completed, and a compression chamber (5) is formed between the spirals (1a) and (2a). As the swinging scroll (2) moves, the compression chamber (5)
gradually decreases its volume, and the gas therein is compressed and discharged from the discharge port (4) provided in the center of the fixed scroll (1).
).

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

Next, the specific structure and operation of the scroll compressor will be explained. FIG. 2 shows the configuration of an embodiment of a scroll compressor, and is a specific embodiment in which the scroll compressor is applied to a hermetic refrigerant compressor. In the figure, (1) is a fixed scroll with a spiral (1a) on the - side of the base plate (lb), and (2) is a fixed scroll with a spiral (2a) on the plywood (2).
(3) is the inlet (
suction chamber), (41 is the discharge port, (5) is both spirals (1
a) When (2a) are combined with each other, both spirals (1a) (2
a) A compression chamber formed in a space, (6) a main shaft, (7) a suction port (7a), and an oil cap mounted so as to occupy the lower end of the main shaft with a predetermined gap between the lower end of the main shaft and the lower end of the main shaft. ,(
8), (9) are the bearing frame, 00 is the motor rotor, (b) is the motor stator, (2) is the seal, 03 is the Oldham joint, 0tsu) is the evil plate, and 06 is the bottom of the shell. Oil reservoir, 00 is suction pipe, αη is discharge pleasure, (to)
is an oscillating scroll bearing which is eccentric with respect to the main shaft (6) and is rotatably fitted into the oscillating scroll shaft (2c) provided on the other side of the base plate (2b). It is fixed in an eccentric hole (60a) formed in the large diameter part (6a) of the section. a is the first main bearing that supports the outer peripheral surface (61a) of the large diameter part (6a) at the top of the main shaft (6), and (e) is the main shaft (6).
6) Second main bearing supporting the lower small diameter portion (6b), e
1D is a first thrust bearing that axially supports the lower surface (<20b) of the base plate (2b) of the oscillating scroll (2), and (A) is a first thrust bearing that supports the large diameter portion (6a) and small diameter portion ( 6b
) The second thrust bearing (c) axially supports the step (6c) between The eccentrically provided oil supply hole communicates with each bearing's 0 barrel (E) section. (Foundation) is the gas vent hole provided in the main shaft (6))
.

(e) is an oil return hole for the oil path, and (ii) and (to) are communication holes for the suction gas path.

Here, the swinging scroll (2) is the fixed scroll (1
), the oscillating scroll shaft (2c) is engaged with the main shaft (6) via the oscillating scroll bearing 0 barrel, and the oscillating scroll bearing 0 barrel and the bearing frame (3)
It is supported by a first thrust bearing Qυ disposed at. Further, the main shaft (6) is connected to a first bearing frame (81, (9)) which is connected to each other by a dowel or the like.
The main bearing O12 is supported by a second main bearing (E) and a second thrust bearing (A). In addition, the Oldham joint 03 is disposed between the swinging scroll (2) and the bearing frame (8), and prevents the swinging scroll (2) from rotating.
It is configured to perform only orbital motion. In this state, the fixed scroll (1) and the bearings 7, frames (8) and (9) are collinearly aligned by bolts or the like. In addition, the motor/rotor QO is attached to the main shaft (6), and the motor/stator dN) is attached to the bearing frame (9 mm, press-fitted).

Fixed by shrink fitting or screws. Furthermore, the oil gap (7) is press-fitted into the main shaft (6).

It is fixed by shrink fitting etc. The mechanism assembled in this way consists of a fixed and oscillating scroll (1) (
2) at the top and the motor rotor and stator 04αυ at the bottom, and are housed and fixed in the shell (2) by press-fitting, shrink-fitting, etc.

Next, the operation of the scroll compressor configured as described above will be explained. When the motor/rotor OQ rotates, the Wi yb scroll (2) begins to revolve through the main shaft (6) and the Oldham joint α, and compression begins according to the operating principle explained in FIG. 1. At this time, the refrigerant gas flows through the suction pipe θ
air gap between the motor/rotor θQ and the motor/stator 0υ. After passing through and cooling the motor, the compression chamber (5 ) and compressed. The compressed gas is discharged from the compressor through the discharge port (4) and the discharge pipe. In addition, the lubricating oil is sucked into the oil cap (7) by the centrifugal pump action by the oil cap (7) and oil supply hole (2) arranged on the main shaft (6) as shown by the dashed arrow from the oil reservoir 0. Each bearing θ~, (E) is supplied with oil through the port (7a) and the oil supply hole @, and furthermore, from bearing 0~, bearing e2D O! J) is refueled in this order. The oil used for lubrication is mainly used in the bearing frame (8),
The oil is returned to the oil reservoir Ql through the oil return holes (A) and (C) provided in (9). i'i'lIn order to prevent oil leaking from the bearing QD etc. from being directly sucked into the suction port (step entry chamber) (3), a baffle plate (the outer peripheral surface of the bearing frame (8) and the oscillating scroll (2) It is provided so as to close the gap between the suction port (
The suction chamber) (3) and the slider cover are separated. Also,
During operation, the waste removal hole (to) provided in the main shaft (6)
This is to quickly discharge the gas in the oil cap (7) to the outside of the shaft to increase pump efficiency.

In such a scroll compressor, the load acting on the oscillating scroll (2) and the accompanying load reaction force of each bearing will be explained. FIG. 3 is a partial detailed view of the oscillating scroll and its bearing, and shows that the oscillating scroll (
2), a centrifugal force acts on the radial gas valve cylinder, and if this force is (Fr), a reaction force (Pr) is applied to the oscillating scroll bearing (to) via the oscillating scroll shaft (2c). arise. In addition, for the axial gas load (Ft), the thrust bearing QI
) a reaction force (I't) is generated.

Moreover, an autorotating torso is generated in the oscillating scroll (2) due to the gas compression, and this is stopped by an Oldham joint 03 having a shape as shown in FIGS. 4(a) and 4(b).

That is, in FIG. 4, (a) is a top view of the Oldham joint Q3, and (b) is a side view of the same, in which a pair of parallel keys (1
8b) is formed at a position shifted by 90° from this,
Another pair of keys (18b) parallel to each other are formed on the lower surface. Figure 5 shows the Oldham VIJ hand Qi assembled on the swinging scroll (2), and a pair of keys (18b) formed on the upper surface of the Oldham ring (18a).
is a pair of key grooves (2
d) and another pair of keys (19b).
is also slidably fitted into a pair of key grooves (not shown) formed in the frame (8).

In this state, when the rotational torque M is applied to the oscillating scroll (2), it is transmitted to the oscillating scroll (2) via the Oldham joint α9, and the keyway (2d) Iζ produces a reaction force (as shown by the arrow). FM) occurs.In this way, since a load is applied to each sliding surface of the oscillating scroll (2), the 11ar
Each side of MJ is prone to seizure and wear. Therefore, in general, these sliding surfaces are surface hardened by hardening, etc., and a soft material such as a bearing metal material is used as the mating material. However, if the entire oscillating scroll (2) is hardened, Therefore, the entire part must be corrected by polishing, etc., and it is virtually impossible to obtain a high-precision r'f correction at the spiral portion (2a). Moreover, in FIG. 6(a), the oscillating scroll (
When the lower surface C20b) of the base plate (2b) in 2), the surface of the bottom plate (2b), and the surface of the oscillating scroll shaft (2C) are hardened, it deforms as shown in Fig. 6(b). I ended up
There were still problems, such as the post-processing being complicated.

[Summary of the invention]

This invention attempts to eliminate the above-mentioned problems by providing a mesh-like hardened surface on the lower surface of the oscillating scroll.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 7(a) is a bottom view of the swinging scroll (2) seen from the bottom side, and FIG. 7(b) is a side view thereof.

In the figure, (A) shows the hardened part by laser hardening, and the lower surface (20b') of the base plate (2b) of the oscillating scroll (2)
As shown above, the concentric and radial quench hardened parts (A
1) (A2) are crossed with each other to form a mesh shape,
The outer peripheral surface (20c) of the rocking scroll shaft (2C) and the groove side peripheral surface (20) of the keyway (2d) of the rocking scroll (2)
In step d), only the portions where uneven contact is likely to occur are hardened, as shown in FIG. 7(b). Laser hardening is originally a localized hardening process, so the strain and deformation is small, but there is a problem in hardening a relatively wide surface like the thrust surface (2b'). This can be solved by hardening it into a shape.

The rest of the configuration is the same as the conventional one, so a description thereof will be omitted.

FIGS. 8(a) and 8(b) are a bottom view and a side view of an oscillating scroll (2) showing another embodiment, in which the oscillating scroll (2) is made of a hard material with good wear resistance such as ductile cast iron. The outer circumferential surface of the oscillating scroll shaft (2C) (
20c) is subjected to local hardening treatment such as induction hardening to form a hardened part (B
), and in that case, an oscillating scroll (
Since the base plate (2b) of 2) is not hardened, it does not have a right-reverse shape. If the above-mentioned oscillating scroll shaft (2C) has a cantilevered structure, this will be particularly effective in preventing seizure accidents caused by one-sided contact. Since a mesh-like surface hardening layer is provided on the lower surface of the oscillating scroll, the entire lower surface of the oscillating scroll is surface hardened, resulting in less distortion and deformation of the oscillating scroll compared to the case where the entire lower surface of the oscillating scroll is surface hardened. In addition, post-processing for distortion correction is simplified, workability is improved, and seizing and wear of the oscillating scroll and thrust bearing can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the operating principle of a scroll compressor, Figs. 2 to 6 show a conventional one, Fig. 2 is a longitudinal sectional view of the scroll compressor, and Fig. 3 is an oscillating scroll and its Detailed views of the bearing section, Figures 4(a) and 4(b) are top and side views of the Oldham joint, Figure 5 is a bottom view showing the assembled state of the swinging scroll and Oldham joint, and Figure 6(a) 7(b) is a side view showing the state of the oscillating scroll before and after quenching, FIGS. Figure 8 (a) (b)
These are a bottom view and a side view of an oscillating scroll showing another embodiment of the present invention. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. In the figure, (1) l is a fixed scroll, (2) is an oscillating scroll, (6) is a main shaft, eυ is a first thrust bearing, (
A) is a hardened part. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3? 61-χ1 (a) (Qin 7th figure 8th figure I

Claims (1)

[Claims] (1) A fixed scroll and an oscillating scroll each having a volute and forming a compression chamber between the volutes by combining these volutes; The main shaft compresses the fluid sucked into the compression chamber, and the thrust bearing supports the thrust force acting on the oscillating scroll from the lower surface side of the oscillating scroll when the fluid is compressed. is a scroll compressor characterized by having a mesh-like hardened surface part. (2) The mesh-like hardened surface part is composed of a concentric hardened part and a radial hardened part that intersects with this hardened part. A scroll compressor according to claim 1, characterized in that: