JPH0932750A - Scroll type compressor and oldham's link thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal wear and seizure due to improper lubrication of a slide face between a turn side key of an Oldham's link and a key groove 6 provided on an end plate 1 of a turn scroll. SOLUTION: The length of a turn side key 63 of an Oldham's link 6 is set to such length that its tip protrudes more to the outside than outer periphery of an end plate 21 of a turn scroll 2 when the turn scroll 2 revolves and turns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor and its Oldham link.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG.
Through FIG. In FIG. 3, reference numeral 4 denotes a closed container, which includes a cup-shaped right housing 49, 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 compression mechanism C are interlockingly connected to each other via a rotary shaft 3. Rotating shaft 3
The right end of the frame is supported by the right housing 49 via a sub-bearing 51, and the left end of the frame 5 via a main bearing 52.
It is bearing on.

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 type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, an Oldham link 6 for preventing the orbiting scroll 2 from rotating.

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.

An Oldham link 6 is interposed between the end plate 21 and the frame 5, and 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.

A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and meshing them by shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, the eccentric drive pin 31, the drive bush 32, and the slewing bearing 3 are driven.
The orbiting scroll 2 is driven via an orbiting drive mechanism including a boss 23, 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, the refrigerant gas containing mist-like lubricating oil enters the low pressure chamber 48 through the suction port 44, and this gas passes through the passage 58 provided on the outer periphery of the stator Mb and the gap 59 between the stator Mb and the rotor Ma. After cooling the electric motor M in the process of passing, the electric motor M is sucked into the closed space 24 through the passage 54 and the suction chamber 47 provided in the frame 5.

As the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and passes through the discharge port 13 from the central portion.
The discharge valve 17 is pushed open to be discharged into the discharge chamber 46, and then discharged to the outside 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, and a pair of fixed side keys 62 extending from the center of the ring 61 in a direction perpendicular to its major axis.
It is provided with a pair of turning side keys 63 extending from the center of the ring 61 in a direction perpendicular to its minor axis.

The fixed key 62 is located in the same plane as the ring 61, and its base end is fixed to the outer peripheral surface 68 of the ring 61. The fixed key 62 is slidably fitted into a key groove 65 formed in the left end surface of the frame 5 as shown in FIG.

The turning side key 63 is a left end surface 69 of the ring 61.
It is fixed on the top and is located in the plane slightly left of the ring 61,
As shown in FIG. 5, these orbiting side keys 63 are slidably fitted in a key groove 66 formed in the outer surface of the end plate 21 of the orbiting scroll 2.

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]

In the conventional Oldham link 6 described above, the sliding surface between the fixed side key 62 and the key groove 65 and the sliding surface between the turning side key 63 and the key groove 66 are located in the suction chamber 47. It was lubricated by the mist of the lubricating oil contained in the inflowing refrigerant gas. However, the turning side key 63 is the turning scroll 2
Since the length is determined so that the tip does not project to the outside of the outer periphery of the end plate 21 during the revolution revolving movement of the, the sliding surface between the revolving-side key 63 and the key groove 66 has poor lubrication. There was a risk of abnormal wear and seizure.

[0019]

The present invention has been invented to solve the above-mentioned problems, and is characterized in that the length of the orbiting side key of the Oldham link is set to the revolution of the orbiting scroll. This is because the length is set so that the tip projects outward from the outer circumference of the end plate of the orbiting scroll during the orbiting motion.

During the revolution orbiting motion of the orbiting scroll, however, the tip of the orbiting side key should protrude outside the outer periphery of the end plate of the orbiting scroll, and the surface of the protruding part should come into contact with the refrigerant gas containing mist-like lubricating oil. The lubricating oil is captured by and the lubricating oil is drawn into the sliding surface between the turning side key and its key groove when the turning side key moves to the inner diameter side.

[0021]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention is shown in FIG. The length of the orbiting side key 63 fitted into the key groove 66 of the orbiting scroll 2 of the Oldham link 6 is the orbiting scroll 2
The length is set such that the tip projects outward from the outer circumference of the end plate 21 of the orbiting scroll 2 during the revolving orbiting movement.

Therefore, when the orbiting scroll 2 revolves around the revolution, the tip of the orbiting side key 63 is the end plate 21 of the orbiting scroll 2.
When it protrudes outward from the outer periphery of, the surface contacts the lubricating oil in the form of mist and captures the lubricating oil, and this lubricating oil moves to the inner diameter side of the orbiting side key 63 and the orbiting side key 63 and the key. It is drawn into the sliding surface with the groove 66. Other structures are the same as those of the conventional one shown in FIGS.
Corresponding members have the same reference characters allotted, and description thereof will not be repeated.

In this way, the sliding surface between the turning side key 63 and the key groove 66 is sufficiently lubricated by the lubricating oil, so that the lubrication failure of these sliding surfaces and the abnormal wear and seizure based on this can be prevented.

[0024]

According to the present invention, during orbiting motion of the orbiting scroll, when the tip of the orbiting side key protrudes outward from the outer periphery of the end plate of the orbiting scroll, the surface of the refrigerant gas contains mist-like lubricating oil. Upon contact, the lubricating oil is captured, and this lubricating oil is drawn into the sliding surface between the turning side key and the key groove when the turning side key moves to the inner diameter side.

In this way, the sliding surface between the turning side key and the key groove is sufficiently lubricated by the lubricating oil, so that it is possible to prevent poor lubrication of these sliding surfaces and abnormal wear and seizure due to this.

[Brief description of drawings]

FIG. 1 is a plan view of an Oldham link installed in a orbiting scroll according to an embodiment of the present invention.

FIG. 2 shows a conventional Oldham link for a scroll type fluid machine, (A) is a plan view, (B) is a sectional view taken along the line BB of (A), and (C) is a C arrow of (A). FIG.

FIG. 3 is a longitudinal sectional view of a conventional scroll type fluid machine.

FIG. 4 is a left end view of a frame of a conventional scroll type fluid machine.

FIG. 4 is a right end view of an orbiting scroll of a conventional scroll type fluid machine.

[Explanation of symbols]

 2 Revolving scroll 21 End plate 66 Key groove 6 Oldham link 61 Ring 62 Fixed side key 63 Revolving side key

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[Procedure amendment]

[Submission date] November 21, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a plan view of an Oldham link installed in a orbiting scroll according to an embodiment of the present invention.

FIG. 2 shows a conventional Oldham link for a scroll type fluid machine, (A) is a plan view, (B) is a cross-sectional view taken along the line BB of (A), and (C) is an arrow C of (A). FIG.

FIG. 3 is a longitudinal sectional view of a conventional scroll type fluid machine.

FIG. 4 is a left end view of a frame of a conventional scroll type fluid machine.

FIG. 5 is a right end view of an orbiting scroll of a conventional scroll type fluid machine.

[Explanation of symbols] 2 Orbiting scroll 21 End plate 66 Key groove 6 Oldham link 61 Ring 62 Fixed side key 63 Orbiting side key

Claims (2)

[Claims] 1. A scroll-type compression mechanism, in which a fixed scroll and an orbiting scroll are meshed with each other, is housed and installed in an airtight container, and an orbiting side key that fits the orbiting scroll into a key groove provided in an end plate thereof. An Oldham link having a fixed key fitted to a key groove provided in a fixed member supporting the orbiting scroll prevents the rotation of the Oldham link and causes the orbital drive mechanism to perform an orbital revolving motion, and the sucked into the closed container. In a scroll compressor that compresses and discharges a refrigerant gas containing mist-like lubricating oil by the scroll compression mechanism, the length of the swing-side key of the Oldham link is changed during the revolving movement of the revolving scroll. A scroll-type compressor characterized in that the length is set such that the tip projects outward from the outer circumference of the end plate of the scroll. 2. An orbiting side key fitted into a key groove provided in an end plate of the orbiting scroll, and a fixed side key fitted into a key groove provided in a fixed side member supporting the orbiting scroll, In an Oldham link for a scroll compressor that allows the orbiting motion of the orbiting scroll but prevents its rotation, the length of the orbiting side key of the Oldham link is set to the end plate of the orbiting scroll during the orbiting operation of the orbiting scroll. An Oldham link for a scroll compressor, which is set to have a length such that the tip projects outward from the outer periphery.