JPS59141784A - Scroll compressor - Google Patents

Abstract

PURPOSE:To permit to support the thrust of a scroll member stably by a method wherein an upper bearing, supporting a swing scroll, is provided so that the center of the bearing is in coincident with the same of the swing scroll while a lower bearing is provided so that the center of the same is in coincident with the rotating center of a crank shaft. CONSTITUTION:The downward thrust of the swing scroll is transmitted to a thrust bearing 91, coaxial with the center C' of the scroll 2, and, then, is transmitted to the thrust bearing 92, supported by the bearing 7 through the flange 93 of the crank shaft. The thrust bearing 92 rotates about the center C by the rotation of the crank shaft 6 and bears the thrust force of the swing scroll 2 in the same manner of normal rotating motion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust bearing for a scroll compressor.

First, we will discuss the principle of a scroll compressor.

The basic elements of a scroll compressor are shown in Figure ts1, and in Figure 1 (11 is a fixed scroll, (2) is an oscillating scroll, (3) is a discharge port, (4) is a compression chamber,
is a fixed point on the fixed scroll, and 0' is a fixed point on the oscillating scroll. The fixed scroll ill and the oscillating scroll (2) are composed of spirals having the same shape, and the shape is a combination of involutes, circular arcs, etc., as is conventionally known.

Next, the operation will be explained. In Fig. 1, the fixed scroll (11 is stationary with respect to space), and the swinging scroll (2) is combined with the fixed scroll (1) as shown in the figure to change its posture relative to space. 0°, 90", t in Figure 1.
As the swinging scroll (2) swings, a crescent-shaped compression chamber (4) formed between the fixed scroll (1) and the swinging scroll (21) moves as shown in FIG. The volume of the gas is sequentially reduced, and the gas taken into the compression chamber (4) is compressed and discharged from the discharge port 131.

During this time, the distance from 0 to 0' in Figure 1 is held constant, and
If the thickness of a1, which is the interval between spirals, is expressed as t, then 00/ = ,
-t. a corresponds to the pitch of the spiral.

Next, the configuration and operation of a specific application example of the scroll compressor will be explained.

Figure 2 shows a specific example of a scroll compressor used in refrigeration or air conditioning, which is configured as a compressor for a gas such as fluorocarbon, and has a so-called semi-hermetic configuration. It has the following.

In the figure, (11 to (4) indicate the same parts as above, (55) is an oscillating scroll shaft, (61 is a crankshaft, (7) is a bearing support, (8) is an electric motor rotor, (9J
is the motor stator, αα is the first balance, αυ is the second balance, a is the key, (13 is the spacer, Q4) is the key, α is the washer, (I6) is the locking washer, and the same is the rotor locking nut. , a mallet is the starter, ■ is the bolt, the handle is the discharge chamber, (211 is the pole), (23 is the O-ring,
(To) is the shell, (241 is the stator fixing bolt, (C) is the washer, Q61 is the support ring, the forehead is the bottom plate, C barrel is the suction screw hole, (29) to (32) are the blank screw holes, (
33) is oil filled, (34) is Oldham joint, (35) is thrust bearing, (36) is bearing metal, (37) is bearing metal, (38) is thrust bearing, (39) is bearing metal, (40) ) (41) is a hermetic terminal, (Q)σ
It is a crankshaft eccentric hole.

The above are the main components. Figure 3 is a cross-sectional view taken from 1-1 in Figure 2. In the figure, (34) is the Oldham joint, (35) is the thrust bearing, (36) (37) is bearing metal, (42) is crankshaft eccentric hole, (43) is Oldham guide groove, (44) is suction port, (45) is QI
The J-song groove, (46) is a through hole for a bolt, and (47) is a female thread.

Furthermore, when viewed from the IV-IV cross section in Fig. 2, the fourth
In the figure, (46) is a through hole for a bolt;
(47) is a female thread, and (4B) is a communication portion.

Next, the configuration of each component of the scroll compressor configured as described above will be described in detail.

FIG. 5 is a rear and top perspective view of the identification scroll (1), in which (49) is a fixed scroll tooth, (5
(51) is the identification scroll base plate, and (51) is the bolt through hole 1.
．． (52) is a fixed scroll retaining bolt counterbore.

That is, the fixed scroll +11 has a shape in which spiral grooves are provided in a disk of uniform thickness, and fixed scroll teeth (49) are formed as a result of providing the grooves. The part that was not removed without grooves is the fixed scroll base plate (50)
becomes.

A discharge port (
3) is provided, and the inner surface of the discharge port (3) is threaded to enable connection if necessary.

The fixed scroll retaining bolt counterbore (52) is to prevent the head of the bolt from sinking into the counterbore and hitting the counterbore when the discharge chamber (a) shown in FIG. 2 is installed.

Next, FIG. 6 shows an oscillating scroll (2), (53)
(54) is an oscillating scroll tooth, (54) is an oscillating scroll base plate,
(55) is an oscillating scroll shaft, and (56) is an Oldham pawl. The oscillating scroll teeth (53) are grown integrally with the oscillating scroll base plate (54), and furthermore, the Oldham pawl (56) and the oscillating scroll shaft (55) are also integrally molded.

Figure 7 shows the swinging scroll seen from the back (57
) is an oscillating scroll balancer, and (58) is a balancer fixing bolt. The center of the swinging scroll shaft (55) and the center of the swinging scroll base plate are formed to coincide with each other.

The Oldham pawl (56) fits into the Oldham joint (34) shown in FIGS. 2 and 3, and regulates the positional relationship between the swinging scroll (21 and the fixed scroll il+). This is a necessary part to realize the swinging motion of the moving scroll (21).

Note that the Oldham pawls (56) are arranged on a straight line passing through the center. The oscillating scroll shaft (55) is connected to the crankshaft eccentric hole (42) of the crankshaft (6) shown in FIG.
) from the motor rotor (81 to the crankshaft (
61, the oscillating scroll (2
This is a part for realizing the eccentric rocking motion of 1.

Figure 8 shows the bearing support (7), and in the figure (31
) is a blind screw hole, (33) is oil filled, (35) is a thrust bearing, (37) is a bearing metal, (38) is a thrust bearing, (413) is an Oldham guide groove, (44) is an intake port, (45) is a ) is an O-ring groove, (46) is a through hole for a bolt, and (47) is a female thread.

The bearing metal (37) part of the bearing support 17) has a second
When the crankshaft (61 shown in the figure) is fitted, the stepped portion of the crankshaft (6) will rest on the thrust bearing (38). It has the function of supporting the back surface of the oscillating scroll (54) and receives the thrust applied from the oscillating scroll (21).In some cases, hydraulic pressure or the like is introduced to the surface of the thrust bearing (35) to support the oscillating scroll (21). The Oldham guide groove (43) is the part into which the Oldham joint (34) shown in Fig.
4) is the part that performs linear reciprocating motion. Inlet (44
) are provided in this embodiment, and pass through the bearing support (7). Also, oil for refueling (33)
A blind screw hole (31) communicating therewith is installed, and the blind screw hole (31) is used, for example, when measuring the supply oil pressure. The end face where the bolt through hole (46) and female thread (47) are provided, and the thrust bearing (35)
), the surface of the thrust bearing (35) is sunk by the thickness of the oscillating scroll base plate (54) plus about 10/Im~50 μm, and the fixed scroll (11 is When fixed, the oscillating scroll (2) is allowed to oscillate.This situation is better understood in FIG.

FIG. 9 shows an Oldham joint (34), and in the figure,
(59) is a bearing fitting pawl, (60) is an oscillating scroll fitting kite groove, and (61) is a ring. This Oldham joint (34) is connected to the fixed scroll I as shown in FIG.
It is for maintaining the relative position! i relationship between I+ and the swinging scroll (21), and defines the swinging orbit of the swinging scroll (21 together with the crankshaft (61).

The bearing fitting pawl (59) fits into the Oldham guide groove (43) of the bearing support (7), and the oscillating scroll fitting guide groove (60) fits into the Oldham's pawl (43) of the oscillating scroll (21).
56). The ring (61) is a bearing fitting pawl (59).
) and the oscillating scroll fitting guide groove (6) are configured to be perpendicular to each other with respect to the center thereof.

Then, when the crankshaft (610 rotations) and the swinging scroll (2) performs eccentric movement, the Oldham joint (34)
The bearing fitting pawl (59) fits into the Oldham guide groove (43) of the bearing support (7), and the entire Oldham joint (34) performs reciprocating linear motion in the direction of the Oldham guide groove. In this state, the swinging scroll (2), which is fitted into the Oldham joint (34) via the swing scroll fitting guide groove (60), is further positioned relative to the Oldham joint (34). Performs reciprocating linear motion. As a result, the oscillating scroll 12) realizes an eccentric oscillating motion as a combination of two orthogonal reciprocating linear motions.

Next, FIG. 10 shows the crankshaft (61, (62) (
63) is an oil groove, (64) and (65) are key grooves, (6
6) is the shaft fitting part, (67) is the rotor mounting part, (68)
is the shaft fitting part, (69) is the screw for the stator fixing nut, (
70) is a groove for a non-rotating washer.

The crankshaft 16+ receives the driving force of the electric motor rotor (8) attached to the rotor attachment portion (67), and provides rotational force to the swinging scroll +21 fitted in the crankshaft eccentric hole (42). Further, the bearing metal (36) is provided with an oil groove (63) for oil supply, and this groove is usually cut on the anti-load side. The shaft fitting part (66) fits into the bearing metal (37) part of the bearing support (7), and the stepped part of the crankshaft (610) is supported by the thrust bearing (38) of the bearing support (7). The shaft fitting part (66) is also provided with an oil groove (62), which constitutes an oil supply path.Furthermore, it is connected to the oil grooves (62) and (63) to provide an oil filler (33). ) are provided at two locations in the figure, one of which is shaped like an I so that it can pass through the central shaft of the crankshaft (61) and supply oil to the shaft fitting portion (68).

The keyway (64) is for fixing the first balance shown in FIG. 2, and the keyway (65) is the part where the exercise machine rotor (81) is attached. ) is the bearing metal (39) of the bottom plate (27) shown in Figure 2.
This is the part that fits into the stator locking nut (69) and restrains and supports the radial movement of the crankshaft (6).
) is the rotor locking nut a′? shown in FIG. ) is attached, and the locking washer groove (7) is fitted with the claw of the locking washer (16) of the rotor locking nut←η.

Next, the operation of the scroll compressor shown in FIG. 2 as a whole will be explained. Through the hermetic terminal (41),
Motor stator (90 - For example, when starting 3-phase AC,
The electric motor rotor 181 generates torque and drives the crankshaft (
6). When the crankshaft (6) starts rotating, rotational force is transmitted to the swinging scroll shaft (55) fitted in the crankshaft eccentric hole (42), and the swinging scroll (2) is moved to the bearing (7). Oldham fitting installed (3
4) to achieve eccentric rocking motion. Then, a compression action as shown in FIG. 1 is performed, and the compressed gas is discharged from the discharge port (3). The gas, such as fluorocarbon, flows in through the suction screw hole (28) on the bottom plate, and flows into the motor rotor (8) and motor stator 191.
The suction port (44) provided on the bearing support (7) passes through the air gap between the motor stator 191 and the shell @.
) (see Figure 3), through the communication part (48) to the compression chamber (
4). This is the operating path, and in the oil supply system, for example, if the discharge chamber (to) has a built-in oil separator (not shown), the oil separated in the discharge chamber (to) is transferred to the fixed scroll (1). The oil well (33) provided in the bearing support (7), the oil well provided in the bearing support (7)
33) and reaches the bearing metal (37). Furthermore, the first
Oil filler (33), oil groove (62), (6
3), thrust bearing (35), bearing metal (39)
), each part of the thrust bearing (38) is also supplied with oil. The oil that has passed through the thrust bearing (35) is taken into the compression chamber together with the inhaled gas.

The oil that has passed through the thrust bearing (38) and the bearing metal (39) flows into the shell (c), is atomized by the flow velocity of the suction gas and the action of the stirrer, and is combined with the suction gas to enter the compression chamber. I was shocked. The oil injected into the compression chamber (4) together with the suction gas flows through the fixed scroll teeth (49).
) (see Figure 5) and the oscillating scroll teeth (53) to minimize leakage (
2.Has a suppressing effect. The oil flowing out from the thrust bearing (35) also lubricates each sliding surface of the Oldham joint. The oil that has thus flowed into the discharge chamber again is separated by an oil separator (not shown) and is pumped to the oil supply line by the pressure of the discharged gas. During this time, the oil that is not separated by the oil separator, for example, when used as a refrigerator, circulates through the refrigeration cycle and returns to the suction screw hole 121 together with the suction gas. Further, the oil separator may not be provided within the discharge chamber (to) but may be provided as a separate body outside.

Next, the configuration and operation of the thrust bearing of the present invention will be explained. FIG. 11 shows an embodiment of the present invention, in which (2) is an oscillating scroll, 161 is a crankshaft, (7) is a bearing support, (36) is a bearing metal,
(42) is the crankshaft eccentric hole, (55) is the swinging scroll shaft, and (91) is the center O of the swinging scroll (2).
A thrust bearing (92) is installed concentrically with the rotation center of the crankshaft +61, and (93) is interposed between the thrust bearings (91) and (92). The collar of the annular body, in this case crankshaft 1
61.

FIG. 12 is an operational diagram of the thrust bearing of the present invention,
In the figure, (91) and (92) are schematic representations of thrust bearings.
Formula % In Fig. 11, when the crankshaft (6) is driven by an external driving means such as a motor, compression is performed according to the principle shown in Fig. 1, and the oscillating scroll In contrast to (2), a downward thrust force is generated in FIG. This thrust force is first applied to a thrust bearing (
91), and then through the crankshaft collar (93) formed integrally with the crankshaft +61.
7) is transmitted to the thrust bearing (92) supported by the shaft bearing (92). This thrust shaft, the bearing (92) is located at the center 0 of the bearing support (7).
It is placed concentrically with.

Therefore, the thrust bearings (91) and (92) installed in this manner operate as shown in FIG. 12. That is, as the crankshaft 161 rotates, the bearing (92) rotates around C, while the thrust bearing (91) L:r
? Either the central axis C' rotates eccentrically around C, or the thrust bearing (91) rotates about C' relative to the oscillating scroll (2).

By performing rocking motion using two thrust bearings in this manner, it becomes possible to convert the thrust force of the rocking scroll (2) into normal rotational motion and support it.

In the above embodiment, the thrust bearings (91) and (92) are needle roller bearings having needle rollers (94) and thrust orbital shafts (95), but they may also be ball bearings. Also, depending on the design, the rollers may not be p-bearings but may be slide bearings or hydrostatic bearings.

Further, in the above embodiment, an example was described in which the crankshaft collar (93) is formed integrally with the crankshaft (61), but the collar portion is not integral with the crankshaft (61) but is formed with thrust bearings (91), (92). Also, it does not matter if the ring-shaped body located between the two is supported by the bearing (7) in a stacked state.

The scroll compressor having the thrust bearing structure configured as described above has the advantage of enabling extremely stable thrust support and further improving reliability.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the operating principle of a scroll compressor, Fig. 2 is a sectional view showing an application example of the scroll compressor, Fig. 3 is a sectional view taken along the fil-1 line of the second example, and Fig. s4 is a sectional view of Fig. 2. A sectional view taken along the line IV-IV, Fig. 5 is a perspective view showing the identification scroll, -A6 Fig. 7 is a perspective view showing the oscillating scroll, Fig. 8 is a perspective view showing the bearing, and Fig. 9 is a perspective view showing the Oldham joint. 10 is a perspective view showing the crankshaft, FIG. 11 is a sectional view showing an embodiment of the present invention, and FIG. 12 is a diagram showing the operating principle of the present invention. In the figure, C1) is a defining scroll, (21 is an oscillating scroll, (31 is a discharge port, +4) is a compression chamber, (6) is a crankshaft, (7) is a bearing support, (35) is a thrust support,
(42) is the crankshaft eccentric hole, (55) is the oscillating scroll shaft, (91) and (92) are the thrust bearings, (93) is the
) is the crankshaft horn <, 0 is the central axis, and C' is the eccentric axis. Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent Masuo Oiwa 1 Figure 270' 1B0 Figure 2 0 1 Figure 8 Figure 6 Figure 7 Figure 5 Figure 8 Figure 9 io Figure 11 Figure CC'

Claims (1)

[Scope of Claims] (1) In a scroll compressor, two upper and lower thrust bearings are provided to support the oscillating scroll, the upper bearing is provided to coincide with the center of the oscillating scroll, and the lower bearing is provided to the crankshaft. A scroll compressor characterized in that the scroll compressor is provided in alignment with the rotation center of the scroll compressor. (2) The scroll compressor according to claim 1, wherein the two upper and lower thrust bearings are configured to support thrust force via a collar portion provided integrally with the crankshaft. (31) The scroll compressor according to claim 1, wherein the two upper and lower thrust bearings are configured to support thrust force via an annular body provided separately from the crankshaft. 4) Scroll pressure 1s0 according to any one of claims 18 to 3, in which the thrust bearing is a rolling bearing (51 claims 1 to 3, in which the thrust bearing is a rolling bearing) The scroll compressor according to any one of claims 3. (6) The scroll compressor according to any one of claims 1 to 3, wherein the thrust bearing is a hydrostatic bearing.