JPH0949495A - Scroll type motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lubricate a sliding surface of a boss and a drive bush, sliding surface of an eccentric drive pin and the drive bush, etc., by drilling a radial direction through hole, connecting the inside/outside of a boss, in the boss of a turn scroll to be opposed to a turn side key of an Oldham's link. SOLUTION: When a turn scroll 2 makes a turning motion of revolution around, a turn side key 63 of an Oldham's link 6 is reciprocated in an arrow direction A in a key groove 66, and a ring 61 is also reciprocated in the arrow direction A. In this way, gas containing a mist of lubricating oil is energized by the ring 61, to pass a through hole 70, and advanced to the inside of a boss 23. Lubricating oil, advanced into an internal peripheral side of the key groove 66 during the time the turn side key 63 is positioned in the outward, in the case of moving the turn side key 63 in a centripetal direction, is press advanced by the internal peripheral side end, and the lubricating oil passes through the key groove 66 and the through hole 70 continued to its internal peripheral end, to be advanced into the inside of the boss 23. In this way, an internal surface of the boss 23, external surface of a drive bush 32 and a turn bearing 34 interposed therebetween, and a sliding surface of a slide hole 33 and an eccentric drive pin 31 are lubricated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type electric compressor incorporated in an air conditioner or the like.

[0002]

2. Description of the Related Art One example of a conventional scroll type electric compressor is shown in FIGS. In FIG. 2, 4 is a housing, which is a cup-shaped right housing 49 and a frame 5.
And a cup-shaped left housing 43, which are fastened together by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll compression mechanism C is provided inside the left housing 43.

The electric motor M and the scroll type compression mechanism C are interlockingly connected to each other via a rotary shaft 3. The right end of the rotary shaft 3 is attached to the right housing via an auxiliary bearing 51.
It is supported by 49, and the left end is supported by the frame 5 via a main bearing 52.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll compression mechanism C comprises a fixed scroll 1 and an orbiting scroll 2.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. The outer peripheral surface of the end plate 11 is brought into close contact with the inner peripheral surface of the left housing 43 to bring the end plate 11 into contact. A discharge chamber 46 is formed on the left side of the
47 is limited.

A discharge port 13 is formed in the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17. The fixed scroll 1 is fastened to the left housing 43 by screwing a bolt 57 into the protrusion 15 protruding leftward from the outer surface of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21, and a drive bush 32 is provided in an orbiting bearing 34 in a boss 23 erected on the outer surface of the end plate 21. It is rotatably fitted through. An eccentric drive pin 31 eccentrically provided at the left end of the rotary shaft 3 is slidably fitted in a slide groove 33 formed in the drive bush 32.

The outer surface of the end plate 21 is in sliding contact with the left end surface of the frame 5 via a thrust bearing 53, and an Oldham link 6 is installed between the outer surface of the end plate 21 and the frame 5.

A plurality of compression chambers 24 are formed by causing the fixed scroll 1 and the orbiting scroll 2 to be eccentric to each other by a predetermined distance and to be engaged with each other while shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, eccentric drive pin 31, slide groove 33, drive bush
The orbiting scroll 2 is driven via an orbiting drive mechanism including 32, an orbiting bearing 34, a boss 23, and the like, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius while being prevented from rotating by the Oldham link 6.

Then, a low-temperature refrigerant gas containing a mist of lubricating oil enters the low-pressure chamber 48 via the suction port 44, and this gas is provided with a passage 58 provided on the outer periphery of the stator Mb and a gap 59 between the stator Mb and the rotor Ma. After cooling the electric motor M in the process of passing through, it is sucked into the compression chamber 24 via the passage 54 and the suction chamber 47 provided in the frame 5.

Then, as the volume of the compression chamber 24 decreases due to the orbiting motion of the orbiting scroll 2, the compression chamber 24 is compressed and reaches the central portion. From the central portion, the discharge valve 17 is pushed open to open the discharge valve 17. It is discharged into the inside of the container 46, and then flows out through the discharge port 45.

Details of the Oldham link 6 are shown in FIG.
(A) is a plan view, (B) is a sectional view taken along line BB of (A),
(C) is a view taken along the arrow C of (A). The Oldham link 6 has an elliptical ring 61, a pair of fixed side keys 62 fixed to the ring 61 and extending in the direction perpendicular to the major axis from the center, and a minor diameter fixed from the center to the ring 61. And a pair of turning side keys 63 extending in a direction perpendicular to the.

The fixed side key 62 is slidably fitted in a key groove 65 formed in the left end surface of the frame 5 as shown in FIG.

The orbiting side key 63 is slidably fitted in a key groove 66 formed in the outer surface of the end plate 21 of the orbiting scroll 2 as shown in FIG.

When the orbiting scroll 2 revolves orbitally, the orbiting side key 63 reciprocates in the key groove 66 in the arrow A direction, and at the same time the fixed side key 62 reciprocates in the key groove 65 in the arrow B direction. Accordingly, the ring 61 reciprocates in the direction of arrow B to prevent the orbiting scroll 2 from rotating.

[0018]

Since each sliding portion of the above scroll type electric compressor is lubricated by the mist of the lubricating oil contained in the gas sucked into the housing 4, the inside of the boss 23 is prevented. The sliding surfaces of the installed drive bush 32, slewing bearing 34, eccentric drive pin 31, and slide groove 33 could be defective in lubrication, causing abnormal wear and seizure.

[0019]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and is characterized in that a boss of an orbiting scroll is provided with a radial through hole communicating with the inside and outside of the boss. This is due to the hole facing the turning side key of the Oldham link.

Another feature is that the through hole is provided on the outer surface of the end plate of the orbiting scroll so as to be continuous with the radially inner end of the key groove into which the orbiting side key of the Oldham link is fitted. It was established in.

When the scroll type electric compressor is in operation, however, the gas containing the mist of the lubricating oil is urged by the Oldham link and forcedly sent into the boss through the through hole, so that the boss and the drive bush are connected. Lubricate the sliding surface and the sliding surface between the eccentric drive pin and the drive bush.

If the through hole is continuous with the radially inner peripheral end of the key groove into which the turning side key of the Oldham link is fitted, the inside of the key groove is reciprocated as the turning side key reciprocates. Lubricating oil is fed into the boss through the through hole.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention is shown in FIG. 1, where (A) is a partial longitudinal sectional view and (B) is a view taken along the line BB of (A).

The boss 23 of the orbiting scroll 2 is provided with a radial through hole 70 communicating with the inside and outside thereof. The through hole 70 is in the radial direction of the key groove 66 into which the orbiting side key 63 of the Oldham link 6 is fitted. It is continuous at the inner edge. Other configurations are the same as those of the conventional one shown in FIGS. 2 to 5, and corresponding members are denoted by the same reference numerals and the description thereof will be omitted.

When the orbiting scroll 2 revolves during the operation of the scroll type electric compressor, the orbiting side key 63 of the Oldham link 6 reciprocates in the key groove 66 in the direction of arrow A, and the ring 61 also becomes A. Reciprocates in the direction of the arrow. Along with this, the gas containing the mist of lubricating oil is urged by the ring 61 and forcedly sent into the boss 23 through the through hole 70.

Then, the lubricating oil that has entered the inner peripheral side of the key groove 66 while the turning side key 63 is positioned outside is used as the turning side key 63.
When it moves in the centripetal direction, it is pushed by the inner peripheral side end and enters the inside of the boss 23 through the key groove 66 and the through hole 70 continuous with the inner peripheral end, and the inner surface of the boss 23, the drive bush
The outer surface of 32 and the slewing bearing 34 interposed therebetween are lubricated, and the sliding surface of the slide groove 33 of the drive bush 32 and the eccentric drive pin 31 is lubricated.

[0027]

According to the present invention, since a radial through hole that communicates the inside and the outside of the orbiting scroll boss is bored so as to face the key of the Oldham link, the Oldham link is operated during operation of the scroll type electric compressor. The gas containing the mist of lubricating oil is forcibly sent through the through-hole into the boss as it reciprocates, and the sliding surface between the boss and the drive bush and the sliding surface between the eccentric drive pin and the drive bush, etc. Since it is possible to prevent poor lubrication of these sliding surfaces and abnormal wear and seizure due to this, the reliability of the scroll electric compressor can be improved.

If the through hole is provided on the outer surface of the end plate of the orbiting scroll so as to be continuous with the radially inner peripheral end of the key groove into which the key of the Oldham link fits, the through hole is inserted into the key groove. Since the lubricating oil can be pushed by the inner peripheral side end of the turning side key and sent into the inside of the boss through the through hole, each sliding surface inside the boss can be more surely lubricated.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (A) is a partial longitudinal sectional view, and (B) is a view taken along the line BB of (A).

FIG. 2 is a vertical sectional view of a conventional scroll type electric compressor.

FIG. 3 shows an Oldham link of a conventional scroll type electric compressor, (A) is a front view, (B) is a sectional view taken along the line BB of (A), and (C) is C of (A). It is an arrow view along an arrow.

FIG. 4 is a left end view of a frame of a conventional scroll type electric compressor.

FIG. 5 is a right end view of the orbiting scroll of the conventional scroll type electric compressor.

[Explanation of symbols]

 4 Housing C Scroll type compression mechanism 1 Fixed scroll 2 Orbiting scroll 21 End plate 23 Boss 66 Key groove M Electric motor 3 Rotating shaft 5 Frame 52 Bearing 31 Eccentric drive pin 32 Drive bush 33 Slide groove 34 Orbiting bearing 6 Oldham link 63 Orbiting side Key 70 through hole

Claims (2)

[Claims] 1. A rotary shaft shaft, wherein a scroll type compression mechanism, which is formed by meshing a fixed scroll and an orbiting scroll with each other, and an electric motor are housed and installed in a housing, and a shaft fixed to a frame fixed in the housing via a bearing. Is connected to the electric motor at one end thereof and an eccentric drive pin is provided at the other end thereof, and the eccentric drive pin is rotatably fitted in a boss erected on the outer surface of the end plate of the orbiting scroll. In the scroll-type electric compressor having an Oldham link installed between the outer surface of the end plate of the orbiting scroll and the frame to prevent rotation of the orbiting scroll from rotating, the inside and outside of the boss of the orbiting scroll are A radial through hole communicating with the Oldham link is formed so as to face the turning side key of the Oldham link. That scroll type electric compressor. 2. The through hole is provided on the outer surface of the end plate of the orbiting scroll so as to be continuous with the radially inner peripheral end of the key groove into which the orbiting side key of the Oldham link is fitted. The scroll type electric compressor according to claim 1.