JPH11230061A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent errors of a frame, a positioning pin and an upper bearing from being added to the torsional accuracy between a fixed scroll and a rotary scroll by inserting an Oldham's link between the fixed scroll and the rotary scroll. SOLUTION: The rotary side key 3a of an Oldham's link 3 is inserted into a rotary side keyway 91 a fixed side key 3b is inserted into a fixed side keyway 92, and the Oldham's link 3 is interposed between a fixed scroll 1 and a rotary scroll 2. During the revolving motion of the rotary scroll 2, the rotary side key 3a is reciprocated in the rotary side keyway 91, the fixed side key 3b is reciprocated in the fixed side keyway 92, thus the rotary scroll 2 is revolved with its rotation prevented. The errors of a frame 6, a positioning pin and an upper bearing 71 are not added to the torsional accuracy between the fixed scroll 1 and the rotary scroll 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG.
Is shown in The closed housing 8 includes a main body 8a, an upper head plate 8b, and a lower head plate 8c. The discharge chamber 44 is limited above the discharge cover 31 by the discharge cover 31 disposed in the closed housing 8, and the low-pressure chamber 45 is limited below the discharge cover 44.

A scroll type compression mechanism C and an electric motor M for driving the scroll type compression mechanism C are built in the low-pressure chamber 45, and these are linked to each other via a rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb.
Is fixed to the rotary shaft 5 and the stator Mb is fixed to the closed housing 8.

The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, a frame 6, and the like. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11, and a discharge port 13 is formed in the center of the end plate 11.

The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 54 is provided with a slewing bearing 73 in a boss 23 erected at the center of the outer surface of the end plate 21. And is rotatably inserted through the connector.

An eccentric pin 53 projecting from the upper end of the rotary shaft 5 is slidably fitted in a slide hole 55 formed in the drive bush 54. A plurality of closed spaces 24 are formed by displacing the fixed scroll 1 and the orbiting scroll 2 by a predetermined distance from each other and engaging them with each other at an angle shifted by 180 degrees.

The frame 6 is fixed to a closed housing 8, and the orbiting scroll 2 is slidably supported on the frame 6. An Oldham link 3 is provided between the orbiting scroll 2 and the frame 6 to allow the orbiting scroll 2 to revolve orbit, but to prevent its rotation.

The fixed scroll 1 is fastened to the frame 6 by bolts 32 penetrating through a flange 14 formed on the outer periphery of the fixed scroll 1, and the relative positions of the fixed scroll 1 and the frame 6 are regulated by a plurality of positioning pins 33.

At the center of the outer surface of the end plate 11 of the fixed scroll 1, a cylindrical flange 16 projects upward, and a cylindrical projecting projection extends downward from the outer peripheral surface of the flange 16 and the lower surface of the discharge cover 31. O with the inner peripheral surface of the flange 38
A discharge cavity 42 is formed by tightly fitting through a ring 39, and a suction chamber 43 is formed on the outer peripheral side.

The upper end of the rotary shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end is supported by a lower bearing 72 provided on the stay 15. The stay 15 is fixed to the closed housing 8.

When the electric motor M is driven, the orbiting scroll 2 is driven via the rotary shaft 5, the eccentric pin 53, the drive bush 54, the orbiting bearing 73, and the boss 23, and the orbiting scroll 2 is prevented from rotating by the Oldham link 3. In addition, the lower surface makes a revolving motion while slidingly contacting the upper surface of the frame 6.

Then, the gas enters the low-pressure chamber 45 via the suction pipe 82, and passes through the passage (not shown) from the suction chamber 43 to the closed space 24.
Inhaled into. Then, as the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, enters the discharge cavity 42 from the discharge port 13, and then passes through the discharge port 46 to the discharge valve. 47 is pushed open to enter the discharge chamber 44, from which it is discharged to the outside via the discharge pipe 83.

Reference numeral 48 denotes a retainer for regulating the lift of the discharge valve 47. One end of each of the discharge valve 47 and the retainer 48 is a bolt.
It is fixed to the outer surface of the discharge cover 31 by 49.

[0014]

In the conventional scroll type compressor, the Oldham link 3 is interposed between the orbiting scroll 2 and the frame 6, and the orbiting side key 3a of the Oldham link 3 is fitted. The orbiting side key groove 34 is engraved on the outer peripheral edge of the outer surface of the end plate 21 of the orbiting scroll 2, and the fixed side key groove 35 into which the fixed side key 3 b of the Oldham link 3 is fitted is engraved on the outer peripheral edge of the upper surface of the frame 6. Have been.

Therefore, the frame 6 and the positioning pins 3 are provided with a high twist accuracy between the fixed scroll 1 and the orbiting scroll 2.
3. There is a problem that errors of the Oldham link 3, the upper bearing 71 and the like are accumulated.

After the orbiting scroll 2 is set on a jig and a spiral wrap 22 is formed on the inner surface of the end plate 21,
Since the revolving scroll 2 must be set on another tool and the revolving-side keyway 34 must be formed on the outer surface of the end plate 21, it is difficult to improve the torsional accuracy of the revolving scroll 2.

Further, since the area of the outer surface of the end plate 21 of the orbiting scroll 2 in sliding contact with the upper surface of the frame 6, ie, the area of the thrust bearing, is reduced, the thrust surface pressure increases, and an accident such as seizure may occur. was there.

[0018]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is that a fixed scroll fixed to a frame and a mesh with the fixed scroll mesh with the fixed scroll. A scroll-type fluid machine having a orbiting scroll that revolves orbits while slidingly contacting the frame, wherein an Oldham link is interposed between the fixed scroll and the orbiting scroll.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 3, wherein FIG. 1 is a partial longitudinal sectional view of a scroll compressor, and FIG. 2 is a view taken along the line BB of FIG. FIG. 3 and FIG. 3 are arrow views along the line CC in FIG.

The Oldham link 3 comprises a pair of turning keys 3a, a pair of fixed keys 3b extending in a direction perpendicular to the turning keys 3a, and an annular ring 3c connecting these keys.

On the outer peripheral edge of the inner surface of the end plate 21 of the orbiting scroll 2, an orbiting key groove 91 into which the orbiting key 3 a of the Oldham link 3 is fitted is formed. A fixed key groove 92 into which the fixed key 3b of the Oldham link 3 is fitted is formed on the lower surface of the flange 14 of the fixed scroll 1.

The Oldham link 3 is connected to the fixed scroll 1 and the orbiting scroll 2 by fitting the turning key 3a of the Oldham link 3 into the turning key groove 91 and fitting the fixed key 3b into the fixed key groove 92. It is interposed between.

When the orbiting scroll 2 is revolving orbiting, the orbiting key 3a of the Oldham link 3 is turned into the orbiting keyway.
Reciprocating within 91, and fixed key 3b is fixed key groove 92
By reciprocating inside, the orbiting scroll 2 revolves orbiting while its rotation is prevented. FIG. 4 shows another configuration.
The same reference numerals are given to corresponding members, and description thereof will be omitted.

Since the Oldham link 3 is interposed between the fixed scroll 1 and the orbiting scroll 2, the frame 6, the positioning pins 33, the upper The error of the bearing 71 is not added, and therefore, the fixed scroll 1
The torsion accuracy between the and the orbiting scroll 2 is improved.

The spiral wrap of the orbiting scroll 2
Since the orbiting scroll 2 and the orbiting keyway 91 can be machined without removing the orbiting scroll 2 from the jig, the torsion accuracy of the orbiting scroll 2 is improved.

Further, since there is no revolving-side keyway on the outer surface of the end plate 21 of the revolving scroll 2 and there is no fixed-side keyway on the upper surface of the frame 6, the thrust bearing area can be increased. Since the surface pressure can be reduced, accidents such as seizure can be prevented.

Although the example in which the present invention is applied to a compressor has been described above, it is needless to say that the present invention can be applied to a fluid machine such as an expander. Applicable to fluid machines.

[0028]

According to the present invention, the Oldham link is interposed between the fixed scroll and the orbiting scroll.
Errors in the frame, the positioning pin, the upper bearing, and the like are not added to the twisting accuracy between the fixed scroll and the orbiting scroll, and therefore, the twisting accuracy between the fixed scroll and the orbiting scroll can be improved.

Further, since the spiral wrap of the orbiting scroll and the orbiting side keyway can be processed without removing the orbiting scroll from the jig, the torsion accuracy of the orbiting scroll can be improved.

Further, since the thrust bearing area increases,
The thrust surface pressure is reduced, so that accidents such as seizure can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll type fluid machine showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view taken along line CC of FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

 6 Frame 1 Fixed scroll 11 End plate 12 Spiral wrap 14 Flange 2 Orbiting scroll 21 End plate 22 Spiral wrap 3 Oldham link 3a Revolving key 3b Fixed key 3c Ring 91 Revolving key groove 92 Fixed key groove

Claims (1)

[Claims] 1. A scroll-type fluid machine comprising: a fixed scroll fixed to a frame; and a revolving scroll that revolves orbit while engaging with the fixed scroll and slidingly contacting the frame. A scroll-type fluid machine having an Oldham link interposed therebetween.