JPS60206988A - Scroll compressor - Google Patents

Abstract

PURPOSE:To lower a level of a coupling claw as well as to reduce a degree of upsetting moment acting on the coupling, by installing a return oil hole for the oil that lubricated a thrust bearing, within the kinetic path of an Oldham's coupling, while intercepting the suction port side from the return oil hole at a ring part of the Oldham's coupling. CONSTITUTION:Depth of a hollow part 8a in a bearing frame 8 of this compressor is designed to be shallow as compared with the conventional one, and a return oil hole 25 is installed at plural spots in number within the kinetic path of an Oldham's coupling 13. This means that an empty space 32 in the inner circumferential side of a ring part 18a of the Oldham's coupling is always connected to the return oil hole 25 but this return oil hole comes not to be interconnected to an empty space 35. As a result, height of a claw 131a coupling the Oldham's coupling and a scroll 2 togehter is reducible as far as the thickness of a conventional baffle plate so that a degree of upsetting moment to tilt the side coupling becomes smaller, thus rolling motion in the Oldham's coupling is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scroll compressor equipped with an Oldham joint that provides only orbital motion to an oscillating scroll.

[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 (6) is a compression chamber. Further, 0 is the center of the fixed scroll (1).

L Fixed scroll (υ) and oscillating scroll (February, spirals with the same shape but opposite winding directions (LA) (2a)
As is conventionally known, the shape of these spirals (ta) (2a) is composed of an inner arc of an involute curve 9, etc.

Next, the operation will be explained. Fixed scroll above (1)
is stationary with respect to space, and the oscillating scroll (2) is assembled with a phase shift of 180'' with respect to the fixed scroll (1), and does not rotate around the center O of the fixed scroll (1). Performs orbital motion, and Figure 1 (a) ~
As shown in (d) <0",9G", 180°,
Move like 270°. In the figure, gas confinement in the suction chamber (3) is completed in the 0@ state shown in FIG. 1(a),
A compression chamber (5) is formed between the spirals (1a) and (2a). As the oscillating scroll (2) moves, the compression chamber (5) sequentially reduces its volume, and the gas therein is compressed and sent to the discharge port (4) provided at the center of the fixed scroll (1). It will be drained out.

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

Next, the specific configuration and operation of the scroll pressure WJ machine 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 same figure, (1) is a fixed scroll provided on the - side of the spiral (1a) and the base plate (Ib),
(3) is the inlet (
suction chamber), (4) is the discharge port, (5) is both spirals (1
When aX2a) are combined with each other, both spirals (la) (2a
), (6) is a main shaft, (7) is an oil cap having a suction port (7a), and is attached to cover the lower end of the main shaft with a predetermined gap between the lower end of the main shaft; )
, (9) is a bearing frame, and the bearing frame (8) has a recess (
8a). aO is the motor/rotor, (b) is the motor/stator, @ is the seal, (2) is the Oldham joint, Q
4 is a waste plate, M is an oil reservoir installed at the bottom of the shell (b), o
n is a suction pipe, αη is a discharge pipe, and C1l is a oscillator which is eccentric with respect to the main shaft (6) and is rotatably fitted into the oscillating scroll IFill (2c) provided on the other side of the plywood (2b). With a dynamic scroll bearing, the main shaft (6) is connected to the large diameter part (6a
) is fixed in an eccentric hole (60a) formed in the hole (60a). o
I is the outer peripheral surface (61a) of the large diameter part (6a) of the main shaft (6).
), (a) is the second main bearing that supports the small diameter part (6b) at the bottom of the main shaft (6), and eυ is the lower surface of the base plate (2b) of the oscillating scroll (2). (2ob)
The first thrust bearing supports the base plate (2b) of the oscillating scroll (2) in the axial direction, and the bearing frame ( 8
). (A) is a second thrust bearing that supports the stepped portion (6c) between the large diameter portion (6a) and the small diameter portion (6b) of the main 1111 (6) from the axial direction, and the bearing frame (
9). (C) is an oil supply hole that has an opening (28a) at the lower end of the main shaft (<6) and is provided in the main shaft (6) eccentrically by υ with respect to its axis, communicating with each bearing OS). . H is the gas vent hole provided in the main shaft (0), (2)
, (2) is the oil return hole for the oil path, and @ is the communication hole for the suction gas path.
), the oscillating scroll shaft (2c) is engaged with the main shaft (6) via the oscillating scroll bearing □□□, and the oscillating scroll bearing 01l) and the bearing frame (8) The first thrust bearing C! It is supported by υ. Further, the main shaft (6) has a first main bearing H, a second main bearing 4, and a second thrust bearing P arranged in a bearing frame (81, (9)) which are connected to each other with a dowel or the like. The Oldham joint 03 is supported by the rocking scroll (2) and the bearing frame (8).
The oscillating scroll (2) is disposed between the oscillating scroll (2) and is configured to prevent the oscillating scroll (2) from rotating on its own axis and to perform only a revolution movement.

That is, as shown in FIG. 8, the Oldham joint (2) has an annular ring portion (18a) and a t
It consists of a pair of first and second pawls (xsla) (182a) that are provided perpendicularly to each other on the surface and the bottom surface, and the first pawl (182a) is attached to the oscillating scroll (2
) A pair of first 1't'l) (200b) 1m, provided on the lower surface (2ob) of the base plate (2b) (182b) shown in Fig. 2 and Fig. 4 The grooves (800a) are slidably inserted into the pair of second grooves (800a) provided at the bottom of the recess (8a) of the bearing frame (8) as shown in FIG. c.
The oscillating scroll (21) is housed in the recess (8a) of the bearing frame (8) on the outside of the oscillating scroll (21), and the oscillating scroll (2) and the bearing frame (8) are connected so that the oscillating scroll (phantom) performs only orbital motion. ing.

In this state, the fixed scroll (1) is collinear with the bearing frames (8) and (9) by bolts or the like. In addition, the motor/rotor Ql) is attached to the main shaft (6),
The motor/stator aυ is fixed to the bearing frame (9) by press fitting, shrink fitting, screwing, or the like.

Furthermore, oi! The gap (7) is fixed to the main shaft (6) by press fitting, shrink fitting, or the like. The mechanism assembled in this way is a fixed and swinging scroll (1).
(21 is the L part, and the motor rotor and stator 01αp are placed in the lower part and are housed and fixed in the shell (B) by press-fitting, shrink-fitting, etc.).

Next, the operation of the scroll compressor configured as described above will be explained. When the motor rotor QO rotates, the first and second pawls (181a) (182a) of the Oldham joint (2) engage the first and second grooves (20) via the main shaft (6).
0b) Sliding inside (800a) and swinging scroll - JL/
(2J begins to revolve while being prevented from rotating, and compression begins according to the operating principle explained in Figure 1. At this time, refrigerant gas is sucked into the shell cylinder through the suction pipe QQ, and the bearing is moved as shown by the solid line arrow 1. After cooling the motor by passing through the communication hole between the frame (9) and the motor/stator (b), the air gap between the motor/rotor QO and the motor/stator (b), etc. and bearing frame (8
) (9) and is taken into the compression chamber (5) through the suction port (3) provided in the fixed scroll (1) and compressed. The compressed gas is discharged from the discharge port (4
) and is discharged to the outside of the compressor from the discharge pipe (17). 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) disposed on the main shaft (6) as shown by the dashed arrow from the oil reservoir (IQ). Oil is supplied to each bearing (2) through the opening (7a) and the oil supply hole (7), and further from the bearing (7) to the bearing 12.
+) Oil is supplied in the order of On H. The oil used for lubrication is returned to the oil reservoir (119) mainly through the oil return holes (A) and (1) provided in the bearing frames (8) and (9). The oil leaking from the inlet goes directly to the inlet (
A baffle plate A4 is provided to close the gap between the bearing frame (8) and the outer circumferential surface of the swinging scroll (2) so as not to be sucked into the suction chamber) (3). 2) separates the suction port (suction chamber) (3) from the sliding mechanism. The gas vent hole (c) provided in the main shaft (6) closes the oil cap (7) during operation.
This is to quickly discharge the gas inside to the outside of the shaft and increase pump efficiency.

Next, a more detailed explanation of the oil supply system portion of such a compressor will be given with reference to FIG. That is, the sixth column is a local cross-sectional view showing the structure near the main shaft ((i)
The lower end surface (20c) of the scroll shaft (2c), the bottom surface (eooa) of the oscillating scroll bearing 0$ and the eccentric hole (60a)
), which communicates with the oil supply hole (2) that opens at the bottom (600a) of the eccentric hole (6a). , 01) is located on the inner peripheral side of the thrust bearing C2]), and is located on the lower surface (
2ob) and the end surface (61b) of the large diameter portion (6a) of the main shaft (6), the main shaft has a recess (61b) of the bearing frame (8) on the outer peripheral side of the first thrust bearing 4.
8a) and the base plate (2b) of the swinging scroll (2), the eighth space (to) is located on the inner circumferential surface of the swinging scroll bearing (7) and extends from the lower end surface to one end surface. The first oil groove is formed close to the first oil groove, and its lower end communicates with the first space. ■ is a second oil groove formed on the outer peripheral surface (eia) side of the large diameter part (6a) of the main shaft (6) and on the sliding surface with the main bearing Q, and its L end is the second oil groove. Connects to 0υ,
The lower end extends to near the lower end of the main bearing Ql. (2) is a second oil supply hole that communicates the first and second oil grooves, and (21a) is provided on the sliding surface side of the thrust bearing (B) with the swinging scroll (2). 8th radial line
One end of the oil groove communicates with the second space C1η, and the other end communicates with the oil return hole via the eighth space (to). In this way, the first oil supply hole (2), the first space (2), the first oil supply hole, the second oil supply hole), the second oil groove (good), the second space ( 2) Since the eighth oil groove (21a) and a series of oil supply paths are formed, the lubricating oil pumped up by the centrifugal pump action flows as shown by the dashed arrow, and flows through the eighth space 0 pier. The oil is discharged to the side (to the oil return hole). The subsequent oil path is as explained in Figure 2, so its explanation will be omitted.

In such a 4'+'4 configuration, the oil return hole (a) is provided outside the range of the movement locus of the Oldham joint θ1, so the oil flows into the eighth space θ1 and t. 03 and swinging scroll (2) and tlllh receiving frame (8)
Even if the oil tries to flow down to the oil return hole (through the gap between the Since the fourth space C1,i formed between the two and the suction port (3) are in communication, the S fourth space 1 will be sucked into the suction port (3) through the fourth space C1,i. This causes oil slicking phenomenon. At this time, since the baffle plate (LA is arranged so as to overlap with the lower surface (20b) of the base plate (2b) in the swinging scroll <2), the oil is sucked into the suction port (3). This prevents the

However, since the outer peripheral portion of the baffle plate Q4J is cantilevered by the bearing frame (8), it is difficult to ensure horizontal support. Therefore, the oscillating scroll (2
) and the bottom surface of the base plate (2ob) cannot be kept to a certain minimum gap, and the result is oil t,! l) could not be suppressed to a minimum of 8. The problem with the cantilever support 1 is that the Oldham joint α moves below the wide plate αa, as shown in FIG. 5, so the cantilever support is forced. In addition, the arrow (a) in Fig. 4.

(B) indicates the sliding direction of the α field of the Oldham joint (E indicates the oscillating scroll in the direction of arrows (A) and (B)).
2) is guided by the second groove (800a) to reciprocate by the revolution diameter of
The movement trajectory range of the bearing frame (sliding against the oldham g) is formed.

(14a) is the baffle plate σ when the first claw (181a) moves.
◆In order to prevent it from hitting
This is the notch.

The first claw (181a) of the Oldham joint a field is taller by the thickness of the baffle plate α4, so it is shown in Fig. 6 (
a) (b) l As shown, the load point A that the oscillating scroll (2) applies to the first pawl (181a) of the Oldham joint O1 and this Oldham joint A3 are connected to the recess (8a) of the bearing frame (8). When the axial distance from the fulcrum B supported on the bottom surface is h, the larger h is, the easier the Oldham joint (to) is to tilt, so the first thrust bearing? 1) Outer periphery and baffle plate Q
There was a risk of damage due to contact with 41.

[Summary of the invention]

This invention 1β, Oldham #1 (by providing an oil return hole in the movement trajectory QKj4 of one hand, and holding a small section of the evil board in the hand) It is something.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

That is, as shown in FIGS. 7 and 8, by rotating one conventional baffle plate, the ring part (
iaa) K-plane and the lower surface of the base plate of the swinging scroll (2) (2)
0b) so that the gap i with the bearing frame (8
) is formed so that the depth of the recess (8a) is shallower than that of the conventional one, and the Oldham joint 011: surface and the base & of the oscillating scroll (2) overlap over the entire circumference. A joint is provided, and its inner circumferential side and outer circumferential side are separated by a ring portion (18a) of the Oldham coupling. Furthermore, the axial clearance β between the 4 claws (181a) and the groove (200b) of the oscillating scroll (2) and the groove (200b) of the Oldham joint α type is also made to have the same degree of homogeneity as the gap δ of the symbol t. . In addition, several return oils 41 (2) are installed r4 at approximately equal pitches across the movement locus range of Oldham joint α4 cJ
Oldham joint "J = a: J ring part (18
The eighth space Q and the oil return hole (c) on the inner peripheral side of a) are in communication with each other (7, and the oil return hole (c) and the fourth space are not in communication with each other).

Next, we will reveal the lubricating oil thread path. The lubricating oil is discharged from the first thrust bearing V into the eighth space through the same thread path as in the conventional case, and as described above, the lubricating oil is discharged from the first 4AYJ double scroll (2).
The lower surface of the base plate (20b) and the ring gB of the Ildum joint 0→
(18a) J: Because the gap δ with the surface and the axial gap β between the lead 1 pawl (181a) of the Oldham joint α1 and the first groove (200b) of the oscillating scroll (2) are D small, the ring part There is almost no way to go from the eighth space 0 gauze on the inner circumferential side of (18a) to the fourth space (e), and the oil return hole (c) is returned to the oil sump 05 with gauze. Oil leakage through the space c3 is prevented.

Due to the reciprocating motion of the P and Oldham joints (U), the oil accumulated in the eighth space is subjected to a pumping action and is efficiently discharged to the oil return hole.

Also, Oldham has 9; hand (13 and swinging scroll (2)
Since the height of the first claw (181a) that connects can be lowered by the thickness of the conventional 3 mm, the rolling moment that causes the Oldham joint (13 to bend) becomes smaller, and the Oldham joint (13) It becomes difficult to roll.Therefore, damage such as local wear of the holder (Oldham) will be reduced and reliability will improve.As for the structure and operation of the pond, there is a conventional one and Mr.Itc's Q. The explanation is omitted.As shown in Fig. 9 (a) and (b), 1 (Oldham) manual operation 03
Link part (18a) 7 on the second side of J? If several labyrinth grooves (1, 9b) are provided, ring ii3 (18a) top 1
The sealing property of ItI between m and the first groove (200b) of the swinging squirrel (2) is further improved.

[Efficacy of invention]

As described above, in this invention, one oil return hole for returning lubricating oil after lubricating the thrust bearing part into the oil reservoir is provided within the far island locus range of the Oldham joint, and the ring part 1 of the Oldham joint is
This isolates the suction port side of the compression chamber from the oil return hole, which makes it inconvenient to use a baffle plate to prevent oil from entering the suction port as in the past, and the thickness of the baffle plate makes it difficult to use the Altum joint. The height of the claws can be configured low, the overturning moment acting on the Oldham joint can be kept small, and a highly reliable scroll compressor can be obtained.

[Brief explanation of drawings]

Figures 1 (a) to (d) are diagrams of the operating principle of a scroll compressor, Figure 2 is a vertical sectional view of a conventional scroll compressor, Figure 8 is the same (a perspective view of the Oldham joint), Figure 4 is the same Planes 1 and 6 show the assembled state of the Oldham joint and bearing frame.
The figures are also enlarged vertical cross-sectional views of the bearing portions of the fixed and oscillating scrolls, No. 0 C (a) and (b) are side views for explaining the acting force received by the Oldham joint, and Fig. 7 is an embodiment of the present invention. FIG. 8 is a plan view showing an assembled state of the Oldham joint and the bearing frame, and FIGS. Oru showing other examples! FIG. 3 is a plan view and a side view of a knob joint. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. In the figure, (υ is a fixed scroll, (2) is an oscillating scroll, (3) is an inlet, (5) is a compression chamber, (6) is a main shaft, (
(to) is Oldham's navy blue; hands, o9 is the oil reservoir, C2◇ is the first thrust bearing, (a) is the oil supply hole, and (c) is the oil return hole. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 (0) (b) 2a Figure 7 Figure 8

Claims (1)

[Claims] A fixed scroll and an oscillating scroll each having a volute and forming a compression chamber between the t spirals by combining these volutes with each other, and an
A main shaft that drives the oscillating scroll and compresses the fluid sucked into the compression chamber, a motor that drives the main shaft, a thrust bearing that supports the lower surface of the base plate of the oscillating scroll, and a soil shaft. A thrust bearing, comprising: a bearing frame having a main bearing supporting the bearing; an annular ring portion; and a lower surface of the ring portion; is slidably connected to the plywood lower surface and bearing frame of the oscillating scroll t via the first and second pawls on the outside thereof, and imparts only orbital motion to the oscillating scroll t. It has an Oldham joint and an oil reservoir at the bottom, with the fixed scroll and oscillating scroll located at the top, and the motor located at the bottom.
a shell in which the lower end of the fertilizer shaft is housed so as to be immersed in the lubricating oil in the oil reservoir; And always,
Indicate L so that it is located within the motion trajectory range of the Oldham joint.
The bearing frame is provided with an oil return hole for returning the lubricating oil after lubricating the thrust bearing into the oil reservoir, and the ring part of the Oldham joint connects the oil return hole and t to the bearing frame.
A scroll compressor characterized in that the compression chamber is isolated from the suction port side.