JPH0828458A - Selfrotation preventing device in scroll-type fluid machine - Google Patents

Abstract

PURPOSE:To effect good lubrication for respective keys by forming an oil supplying passage inside a ring main body in a rotation preventing device, and supplying oil staying in the oil supplying passage onto sliding surfaces of respective key grooves on both moving and fixed scroll sides of respective keys through respective oil supplying holes. CONSTITUTION:In a scroll-type fluid machine, a moving scroll is rotated and driven in relation to a fixed scroll. In this case, a ring main body 71, a pair of first keys 72 to be slidably engaged with respective first key grooves 31 of the moving scroll, and a pair of second keys 73 to be slidably engaged with respective second key grooves 42, formed perpendicular to respective first key grooves 31, of the fixed scroll are respectively arranged in a rotation preventing mechanism. Moreover, an oil supplying passage 81 is circumferentially provided inside the ring main body 71, so as to be communicated with an oil supplying pump. Respective oil supplying holes 82 opening to respective first key grooves 31 and respective second key grooves 42 are formed on respective first key s72 and respective second keys 73, so as to be communicated with the oil supplying passage 81.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation preventing device for a movable scroll in a scroll type fluid machine for revolving the movable scroll with respect to a fixed scroll.

[0002]

2. Description of the Related Art Conventionally, a scroll type fluid machine provided with a fixed scroll and a movable scroll is disclosed, for example, in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 67080, the movable scroll is revolved around the fixed scroll by a rotation preventing device having an Oldham ring.

This rotation preventing device is, as shown in FIG.
Fixed scroll C through frame B in closed casing A
And the thrust receiving surface E provided on the upper part of the frame B.
And a movable scroll D that meshes with the fixed scroll C.
The end plate of the movable scroll D is rotatably supported, and a pair of first key grooves F are provided on the outer peripheral portion of the movable scroll D, and an upper surface of the frame B extends in a direction orthogonal to the first key grooves F. While forming two key grooves G respectively, an Oldham ring K having first and second keys H and J engaging with these key grooves F and G is arranged on the outer peripheral portion of the end plate of the movable scroll D. The movable scroll D is revolved around the fixed scroll C.

Further, the frame B has a branch passage P, one end of which opens into an oil groove S of a thrust receiving surface E of the frame B and the other end of which communicates with an oil supply passage N provided in the crankshaft L. The thrust receiving surface E is lubricated through the branch passage P, and the lubricated oil is lubricated to the sliding portions of the keys H and J.

[0005]

By the way, in the conventional scroll type fluid machine, the oil is supplied to the respective keys H and J of the Oldham ring K after the oil is supplied to the thrust receiving surface E. However, there was a problem that this lubrication amount became insufficient and good lubrication could not be performed.

Therefore, as the oil supply to each of the keys and the key groove, for example, the one described in JP-A-60-40821 is known. In this oil supply structure, the Oldham ring K is interposed between the fixed scroll and the movable scroll, and as shown in FIG. 9, one surface of the Oldham ring K is fitted into a key groove formed in the fixed scroll. Keys Q, Q are formed on the other surface, and key grooves R, R are formed on the other surface to fit the keys formed on the orbiting scroll, and on the surface of the Oldham ring K on the protruding side of the keys Q, Q. , A semicircular first oil groove S connecting these keys Q, Q,
A plurality of second oil grooves T extending from the outer peripheral portion of the Oldham ring K to the first oil groove S are formed, and the key grooves R, R are communicated with the formation positions of the key grooves R, R in the first oil groove S. The oil holes U, U are formed to supply the oil supplied from the second oil groove T to the keys Q, Q and the key grooves R, R via the first oil groove S. There is.

However, since the oil grooves S and T are formed on the surface of the Oldham ring K, in order to reliably supply oil to the keys Q and Q and the key grooves R and R, the oil grooves S and T are formed on the surfaces of these surfaces. It is necessary to finish the sliding surface with the mating member with high accuracy to prevent oil from leaking, resulting in higher processing cost, and even if the sliding surface has better accuracy, the Oldham ring K Since the oil inevitably leaks along with the movement of, the amount of oil supply is further reduced, and there is still a problem that the key Q, Q and the key grooves R, R are insufficiently supplied with oil.

The present invention has been made to solve the above problems, and an object thereof is to provide a rotation preventing device in a scroll type fluid machine capable of surely supplying oil to the keys.

[0009]

According to the present invention, a rotation preventing device in a scroll type fluid machine for orbiting a movable scroll 3 with respect to a fixed scroll 2 is provided as a ring main body 71.
A pair of first keys 72, 72 slidably engaged with the first key grooves 31, 31 of the movable scroll 3, and a fixed scroll side formed in a direction orthogonal to the first key grooves 31, 31. And a pair of second keys 73, 73 slidably engaged with the second key grooves 42, 42 of the second key groove 42, and an oil supply passage 81 is provided inside the ring body 71, and the oil supply passage 81 is supplied with oil. While communicating with the pump, the first keys 72, 7
2 and the second key 73, 73, the first key groove 31, 3
Oil supply holes 82, 8 opened in the first and second key grooves 42, 42
2 is formed, and the respective oil supply holes 82, 82 are connected to the oil supply passage 8
It was connected to 1.

[0010]

In the present invention, the oil supply passage 81 is formed inside the ring body 71, the oil supply passage 81 is communicated with the oil supply pump, and the first and second keys 72 and 73 are
The oil supply holes 82, 82 are provided, and the oil supply holes 82, 82 are provided.
Since 82 is communicated with the oil supply passage 81, the oil supply pump is made to supply lubricating oil to the oil supply passage 81 under pressure, and the oil in the oil supply passage 81 does not leak to the outside. The oil supply hole 82 communicating with the
82 through the key grooves 31, 4 of the keys 72, 73
The sliding surface with 2 can be positively refueled, therefore
The keys 72, 73 can be satisfactorily lubricated.

Further, since the oil supply passage 81 is formed inside the ring main body 71, the hollow ring main body 71 can be formed. Therefore, the hollow member can reduce the weight,
Since the unbalanced mass can be reduced, the vibration can be reduced.

[0012]

Embodiments of the present invention will be described with reference to FIGS. The scroll type fluid machine shown in FIG.
In the low-pressure dome type scroll compressor, a compression element CF is installed inside the closed casing 1 and a motor M is installed below the inside of the casing 1. The compression elements CF are arranged to face each other vertically. It is composed of a fixed scroll 2 and a movable scroll 3. The fixed scroll 2 is fixed to a frame 4, and the end plate back side of the movable scroll 3 is rotatably supported by a thrust receiving surface 41 provided on the upper surface of the frame 4. In addition, the movable scroll 3 is interlocked with the crankshaft 5 of the motor M, and the partition body 6 is provided inside the casing 1 on the upper side of the fixed scroll 2.
By the partition body 6, a discharge port 21 formed in the fixed scroll 2 is opened on the upper side of the partition body 6, and a high pressure chamber 13 for opening an external discharge pipe 11 for discharging the discharged refrigerant to the outside of the casing is formed. At the same time, the suction pipe 12 is opened on the lower side of the partition 6 to define the low pressure chamber 14 in which the compression element CF and the motor M are arranged.

Further, a pair of first key grooves 31, 31 is provided at a portion facing the outer periphery of the movable scroll 3, and a pair of first key grooves 31, 31 is provided on the upper surface side of the frame 4 in a direction orthogonal to the first key grooves 31, 31. 2 key grooves 42, 42 are respectively provided to form a ring main body 71 and the ring main body 71.
An Oldham ring 7 composed of first keys 72, 72 and second keys 73, 73 slidably engaged with 1, 42 is provided on the outer peripheral portion of the lower surface of the movable scroll 3 to provide the Oldham ring. 7 constitutes a rotation prevention device that prevents the movable scroll 3 from rotating and revolves the movable scroll 3 with respect to the fixed scroll 2.

Therefore, the movable scroll 3 revolves around the fixed scroll 2 by the rotation of the crankshaft 5 accompanying the driving of the motor M, and this revolving drive causes the suction pipe 12 to move into the low pressure chamber 14. The sucked low-pressure gas is sucked into the compression chamber formed by the scrolls 22 and 32 of the scrolls 2 and 3, the sucked gas is compressed, and the compressed gas is discharged from the discharge port 21 to the high-pressure chamber. 13 is discharged to the casing 1 from the external discharge pipe 11.
It is discharged to the outside.

At the lower end of the crankshaft 5, an oil supply pump (not shown) including a positive displacement oil pump communicating with an oil reservoir (not shown) formed at the bottom of the casing 1 is provided. And a main oil supply passage 5 through which the oil of the oil reservoir is axially formed through the crankshaft 5 by the oil supply pump.
It is pumped up into the inside of the frame 1 to supply oil to the sliding parts such as the bearing part 43 of the crankshaft 5 and the thrust receiving surface 41 of the frame 4.

In the scroll compressor described above, an oil supply passage 81 is provided inside the ring body 71 so that the oil supply passage 81 communicates with the oil supply pump.
The first keys 72, 72 and the second keys 73, 73 are provided with oil supply holes 82, 82 opening to the first key grooves 31, 31 and the second key grooves 42, 42, and the oil supply holes 82 are formed. ，
82 is communicated with the oil supply passage 81.

Specifically, as shown in FIGS. 2 to 5,
The Oldham ring 7 has a ring main body 71 having a square cross section and an oval shape as a whole, and the inside of the ring main body 71 is in a hollow state, and the ring main body 7 has a hollow portion.
That is, the oil supply passage 81 is provided along the shape of No. 1.

Further, a pair of the first keys 72, 72 are provided so as to project on a small-diameter straight line portion of the ellipse on one surface of the ring main body 71 facing the movable scroll 3.
On the other surface of the ring body 71 facing the frame 4, the large diameter portion of the ellipse has the first keys 72, 7
The second keys 73, 73 so that they are positioned in the direction orthogonal to 2
To project.

Further, on the protruding surface of the second keys 73, 73 on the ring body 71, the first keys 72, 7 are formed.
In the small-diameter straight line portion that is the protruding position of 2, elongated holes 83, 83 that open in the oil supply passage 81 and extend along the circumferential direction of the ring body 71 are formed, and these elongated holes 83, 83 will be described later. The oil supply pump is made to communicate with each other via the communication passage 44 and the main oil supply passage 51.

Further, as shown in FIGS. 6 and 7, each of the keys 72 and 73 is a cubic member which is a member different from the ring main body 71, and is attached to the ring main body 71. .

That is, each of the keys 72 and 73 has a protrusion 84 formed at the center thereof on one surface of a member made of a cube, and a recess 85 passing through the center of the cube is formed on the protrusion 84, and The oil supply holes 82, 82 communicating with the recess 85 are formed on a pair of opposing surfaces that are continuous with the surface on which the projection 84 is formed. Then, the protrusions 84 of the keys 72 and 73 are fitted into the mounting holes 86 formed in the ring body 71 and fixed by welding or the like, and the keys 72 and 73 are mounted to the ring body 71. At this time, the oil supply holes 82, 82 are attached so as to open in the circumferential direction of the ring body 71, and the keys 72, 73 are attached.
Is engaged with the first and second key grooves 42, 42, the oil supply holes 82, 82 face the sliding surfaces of the first and second key grooves 42, 42. .

Further, as shown in FIG. 1, one end of the frame 4 is opened to the inner peripheral surface of the bearing portion 43, and the other end is the elongated hole 8 in the ring body 71 of the Oldham ring 7.
A communication passage 44 is formed so as to be opposed to and open with respect to 3, 83, and oil pumped up by an oil supply pump into a main oil supply passage 51 formed in the crankshaft 5 is supplied to the bearing portion 43 via a branch passage 52. At the time of opening, the opening of the communication passage 44 is opposed to the branch passage 52 to pressurize the oil supplied from the branch passage 52 to the communication passage 44, and the ring main body is supplied from the communication passage 44. The oil supply passage 81 formed inside 71 is pressurized from the elongated holes 83, 83.

The lengths of the elongated holes 83, 83 are formed so as to correspond to the sliding amount of the ring body 71 so that the communication passages 44 are always opposed to each other.

Further, the ring body 71 and each key 7
2 and 73 are formed of different members, but are made of the same iron.

However, with the above configuration,
According to the present invention, since the oil supply passage 81 is formed inside the ring body 71 and the oil supply passage 81 communicates with the oil supply pump, oil is supplied from the oil supply pump to the oil supply passage 81 under pressure. The oil supply hole 8 communicating with the oil supply passage 81 without leaking the oil in the oil supply passage 81 to the outside.
Each key groove 3 of each of the keys 72, 73 through 2, 82
Since it is possible to positively lubricate the sliding surfaces with the keys 1, 42, the keys 72, 73 can be satisfactorily lubricated.

Further, since the oil supply passage 81 is formed inside the ring main body 71, the hollow ring main body 71 can be formed. Therefore, the hollow member can reduce the weight,
Since the unbalanced mass can be reduced, the vibration can be reduced.

In the above embodiment, the ring body 7 is used.
1 and the keys 72 and 73 are made of the same material, but the ring body 71 is made of a lightweight material such as aluminum, and the keys 72 and 73 are made of a wear resistant material. As a result, the wear resistance can be improved while further reducing the weight.

In the above embodiment, the ring body 71 is used.
And the keys 72 and 73 are formed by separate members,
You may make it integrally molded.

Further, in this embodiment, each of the keys 72 and 7 is
Although 3 is formed in a cubic shape, if the structure has the oil supply hole 82 facing the sliding surface of each of the key grooves 31, 42, and the oil supply hole 82 communicates with the oil supply passage 81, The shape is not limited to a cube and may be formed in various shapes such as a rectangular parallelepiped or an L-shaped member.

Although the ring body 71 is formed in a square shape in cross section, it is not limited to a square shape and may be formed in a rectangular shape or an elliptical shape having a flat sliding surface.

[0031]

According to the present invention, the oil supply passage 81 is formed inside the ring main body 71, and the oil supply passage 81 is communicated with the oil supply pump so that the first key 72, 72 and the second key
In the keys 73, 73, the first key grooves 31, 31 and the second
Since the oil supply holes 82, 82 opening to the key grooves 42, 42 are formed and the respective oil supply holes 82, 82 are communicated with the oil supply passage 81, the oil supply pump 81 is pressurized to the oil supply passage 81. The oil is supplied to the inside of the oil supply passage 81, and the oil in the oil supply passage 81 does not leak to the outside, and slides with the key grooves 31, 42 of the keys 72, 73 through the oil supply holes 82, 82 communicating with the oil supply passage 81. The dynamic surface can be positively lubricated, and therefore, the keys 72 and 73 can be satisfactorily lubricated.

Further, since the oil supply passage 81 is formed inside the ring main body 71, the hollow ring main body 71 can be formed. Therefore, the hollow member can reduce the weight,
Since the unbalanced mass can be reduced, the vibration can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a scroll type fluid machine of the present invention.

FIG. 2 is a bottom view of an Oldham ring that is a rotation preventing device of the present invention.

FIG. 3 is a side view of the Oldham ring of FIG.

4 is a sectional view of the Oldham ring of FIG. 2 taken along the line AA.

5 is a cross-sectional view of the Oldham ring of FIG. 2 taken along the line BB.

FIG. 6 is a sectional view taken along line CC of the Oldham ring in FIG.

7 is a cross-sectional view of the Oldham ring of FIG. 2 taken along the line D-D.

FIG. 8 is a partial cross-sectional view showing a conventional scroll type fluid machine.

FIG. 9 is a top view of a conventional Oldham ring.

[Explanation of symbols]

 2 Fixed scroll 3 Movable scroll 31 1st key groove 42 2nd key groove 71 Ring body 72 1st key 73 2nd key 81 Oil supply passage 82 Oil supply hole

Claims (1)

[Claims] 1. A rotation preventing device in a scroll type fluid machine for orbitally driving a movable scroll (3) with respect to a fixed scroll (2), comprising a ring body (71) and a first key of the movable scroll (3). Groove (31) (31)
Pair of first keys (72) (72) slidably engaged with the
And second key grooves (42) (42) on the fixed scroll side formed in the direction orthogonal to the first key grooves (31) (31).
Pair of second keys (73) (73) slidably engaged with the
And a lubrication passage (8) inside the ring body (71).
1) is provided around the oil supply passage (81) to communicate with the oil supply pump, and the first key groove (72) (72) and the second key (73) (73) are provided with the first key groove ( 31)
(31) and the oil supply holes (82) (82) opening to the second key grooves (42) (42) are formed, and the respective oil supply holes (82) are formed.
A rotation preventing device in a scroll type fluid machine, wherein (82) is communicated with the oil supply passage (81).