JPH1113657A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a self rotation check mechanism for a turning scroll by respectively inserting columns into rings freely to rotate into a hole drilled on a position which is eccentrically for a distance corresponding to a revolutionary turning radius of the turning scroll from a rotating center of the ring. SOLUTION: Circular holes 44 are drilled on each ring 43 eccentrically for a revolutionary turning radius ρ of a turning scroll from the rotating center of the ring 43, and respective columns 41 are rotatably inserted in those holes 44. When the tuning scroll 14 is driven through a turning driving mechanism which consists of an eccentric pin, an eccentric hole, a drive bush, and a turning bearing from a rotary shaft, each column 41 is rotated in the hole 44 around the center O2 of the column 41, and the ring 43 is rotated in a recessed groove 43 around the center O1 of rotational movement of the ring 43 in association with the rotation of the column 41. The self rotation of the turning scroll 14 is checked, and revolutionary turning motion of the turning scroll 14 is carried out on a circular orbit serving the revolutionary turning radius ρ as a radius. It is thus possible to simplify a structure, and it is also possible to reduce sharply the number of parts.

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 1 is a housing, a cup-shaped main body 2
And a front end plate 4 fastened by bolts 3 to this, and a cylindrical member 6 fastened by bolts 5 to this. The rotating shaft 7 penetrates the tubular member 6 and is rotatably supported by the tubular member 6 via bearings 8 and 9.

A fixed scroll 10 is provided inside a housing 1.
And an orbiting scroll 14 are provided. The fixed scroll 10 has an end plate 11 and a spiral wrap 12 erected on its inner surface.
The end plate 11 is fastened to the cup-shaped main body 2 by bolts 13. The O-ring 34 embedded in the outer peripheral surface of the end plate 11 is in close contact with the inner peripheral surface of the cup-shaped main body 2, and the suction chamber 28 is limited on the left side of the end plate 11 and the discharge chamber 31 is limited on the right side.

The orbiting scroll 14 has an end plate 15 and a spiral wrap 16 erected on its inner surface.
16 has substantially the same shape as the spiral wrap 12 described above.

The orbiting scroll 14 and the fixed scroll 10 are mutually eccentric by an orbital revolving radius and are engaged with each other with a phase shift of 180 ° as shown in FIG.
The tip seal 17 buried on the inner peripheral end surface of the 12 is an end plate 15
The tip seal 18 which is in close contact with the inner surface of the spiral wrap 16 is embedded in the inner peripheral end surface of the spiral wrap 16 is in close contact with the inner surface of the end plate 11 and closely contacts the side surfaces of the spiral wraps 12 and 16 at a plurality of places. . In this way, a plurality of closed chambers 19a, 19b which are substantially point-symmetric with respect to the center of the spiral are limited.

A drive bush 21 is rotatably accommodated in a cylindrical boss 20 protruding from the center of the outer surface of the end plate 15 via a swivel bearing 23. An eccentric pin 25 protruding from the inner end of the rotary shaft 7 is rotatably fitted in the eccentric hole 24.

A balance weight 27 is fixed to the drive bush 21, and a ball type rotation preventing mechanism 26 also serving as a thrust bearing is arranged between the outer peripheral edge of the outer surface of the end plate 15 and the inner surface of the front end plate 4. I have.

When the rotating shaft 7 is rotated, the eccentric pin 25, the eccentric hole 24, the drive bush 21, the slewing bearing 23,
Orbiting scroll 14 via orbiting drive mechanism consisting of boss 20
Is driven, and the orbiting scroll 14 revolves in a circular orbit having a revolving radius as a radius while its rotation is prevented by the rotation preventing mechanism 26.

When the orbiting scroll 14 revolves orbits,
The line contact portions of the spiral wraps 12 and 16 gradually move toward the center of the spiral, and as a result, the sealed small chambers 19a and 19b move toward the center of the spiral while reducing the volume.

Accordingly, gas flowing into the suction chamber 28 through a suction port (not shown) is taken into the closed small chambers 19a and 19b from the outer terminal openings of the spiral wraps 12 and 16 and compressed. Scroll to the center 22 and fixed scroll from here
The discharge valve 30 is pushed and opened through the discharge port 29 formed in the end plate 11 of the end plate 10 to be discharged into the discharge cavity 31, from which it flows out through a discharge port (not shown).

[0011]

In the above-mentioned conventional scroll type compressor, a rotation preventing mechanism of the orbiting scroll 14 is provided.
26 and the swing drive mechanism is complicated and the number of parts is large.
There is a problem that the cost increases.

Further, tip seals 17 and 18 are embedded only in the inner peripheral side (about 1.8 turns of the spiral) on the tip end surfaces of the spiral wraps 12 and 16 of the fixed scroll 10 and the orbiting scroll 14. Since the tip seal is not embedded on the outer peripheral side, the outer peripheral end faces of the spiral wraps 12 and 16 and the end plate
There is a problem that the volume efficiency of the scroll compressor is reduced due to the leakage of fluid from the gap between the inner surfaces of the scroll compressors 15 and 11.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the first invention is to form a spiral wrap on the inner surface of each end plate. The fixed scroll and the orbiting scroll that are provided are eccentric to each other, and displaced in phase and mesh with each other, and are disposed inside the housing. The fixed scroll is fixed to the housing and the orbiting scroll revolves orbitally. In a scroll type fluid machine, at least three cylinders are protruded from an outer surface of an end plate of the orbiting scroll, and the same number of rings as the cylinders are rotatably embedded in the housing. It is rotatably inserted into a hole formed at a position eccentric from the center of rotation by a distance corresponding to the revolving radius of the orbiting scroll. In scroll-type fluid machine to be.

The gist of the second invention is that the fixed scroll and the orbiting scroll, each of which has a spiral wrap standing on the inner surface of the end plate, are eccentric to each other, and are engaged with each other while being shifted in phase. In a scroll type fluid machine disposed inside a housing and fixing the fixed scroll to the housing and revolving orbiting the orbiting scroll, the fixed scroll and the orbiting scroll may be provided on the inner peripheral end surface of the spiral wrap. A scroll type fluid machine is characterized in that a tip seal having a smaller width is buried on the outer peripheral side adjacent to the buried tip seal.

The gist of the third invention is that a fixed scroll and an orbiting scroll, each having a spiral wrap erected on the inner surface of an end plate, are mutually eccentric, and are engaged with each other while being shifted in phase. A scroll-type fluid machine disposed inside a housing and fixing the fixed scroll to the housing and revolving the orbiting scroll in a revolving orbiting motion. In a scroll type fluid machine, a drive bush and a balance weight rotatably fitted inside a boss via a swivel bearing are integrally formed with an inner end of a rotating shaft penetrating the housing. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. On the outer peripheral edge of the outer surface of the end plate 15 of the orbiting scroll 14, a plurality (3 in FIG.
) Are protruded. Three circular concave grooves 42 are formed in the annular inner end face of the front end plate 4 at equal intervals along the circumferential direction, and each of the concave grooves 42 has a disc-shaped ring therein. 43 is rotatably embedded in its center 0 about _1.

The circular hole 44 only eccentrically revolving radius ρ of the orbiting scroll 14 in each ring 43 from the rotation center 0 ₁
In each of the holes 44, a column 41 is rotatably fitted. Other configurations are ball-type anti-rotation mechanism
It is the same as the conventional one shown in FIG. 4 except that 26 is abolished.

When the orbiting scroll 14 is driven from the rotary shaft 7 through a orbiting drive mechanism including the eccentric pin 25, the eccentric hole 24, the drive bush 21, the orbiting bearing 23 and the boss 20, the column 41 is moved to the center 0 _2. rotates within the hole 44 around the ring 43 along with this concave groove 43 in the rotational center 0 around ₁
Rotate within.

As a result, the orbiting scroll 14 is prevented from rotating, and revolves in a circular orbit having the orbital turning radius ρ. Thus, since the conventional ball-type rotation preventing mechanism 26 composed of 20 or more parts can be eliminated, the structure is simplified, the number of parts is greatly reduced, and the cost can be reduced.

A second embodiment of the present invention is shown in FIG. The tip surface of the spiral scroll wrap 12 of the fixed scroll 10 has a tip seal 17 covering about 1.8 spirals on the inner peripheral side thereof.
A tip seal 50 having a width smaller than that of the tip seal 17 is buried on the outer peripheral side of the tip seal 17 over about 1/4 of the spiral. Since the outer peripheral side of the spiral wrap 12 becomes thinner, a narrow groove is formed on the end surface thereof.
The chip seal 50 is fitted into the groove 51 by drilling the hole 51.

Although not shown, the spiral scroll wrap 16 of the orbiting scroll 14 also has a tip end surface which is embedded on its inner peripheral side.
A tip seal having a width smaller than that of the 1.8-turn tip seal 18 is buried on the outer peripheral side thereof for about 1/4 turn. The other configuration is the same as that of the conventional one shown in FIG.

Thus, during operation of the scroll compressor,
Gas in the middle of compression in the sealed chambers 19a and 19b is wrapped in spirals
Leakage from the gap between the distal end surfaces of the outer peripheral surfaces of the end plates 12 and 16 and the inner surfaces of the end plates 15 and 11 can be suppressed, so that the volume efficiency of the scroll compressor can be improved.

A third embodiment of the present invention is shown in FIG. The drive bush 21 and the balance weight 27 are integrally formed on the inner end of the rotating shaft 7. And
The eccentric pin 25 and the eccentric hole 24 for inserting the eccentric pin 25 are eliminated. The other configuration is the same as that of the conventional one shown in FIG.

In the third embodiment, however, the turning drive mechanism is simplified and the number of components is reduced, so that the cost can be reduced.

[0025]

According to the first aspect of the present invention,
At least three cylinders are protruded from the outer surface of the end plate of the orbiting scroll, and the same number of rings as the cylinders are rotatably embedded in the housing. Is rotatably inserted into a hole formed at a position eccentric by a distance corresponding to, so that the rotation preventing mechanism of the orbiting scroll can be simplified, and the number of parts and man-hours are reduced, thereby reducing costs. can do.

According to a second aspect of the present invention, a tip seal embedded on the inner peripheral end surface of the spiral wrap of the fixed scroll and the orbiting scroll is provided on the outer peripheral side with a narrower width than the tip seal. Since the tip seal is embedded, it is possible to suppress fluid leakage from the gap between the outer peripheral end of the spiral wrap of the fixed scroll and the orbiting scroll and the inner surface of the end plate, thereby reducing the volumetric efficiency of the scroll type fluid machine. Can improve.

According to a third aspect of the present invention, a drive bush rotatably fitted via a revolving bearing inside a cylindrical boss projecting from the center of the outer surface of the end plate of the revolving scroll. In addition, since the balance weight is formed integrally with the inner end of the rotating shaft that penetrates the housing, the orbiting drive mechanism of the orbiting scroll can be simplified, and the number of parts and man-hours are reduced, thereby reducing costs. it can.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is a partially exploded perspective view, and FIG. 1B is a sectional view of a main part.

2A and 2B show a second embodiment of the present invention, wherein FIG. 2A is a front view of a fixed scroll, and FIG. 2B is an enlarged view of a portion B of FIG.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.

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

[Explanation of symbols]

14 Orbiting scroll 15 End plate 16 Spiral wrap 4 Housing 41 Cylinder 42 Concave groove 43 Ring 0 ₁ Center of rotation ρ Orbital turning radius 44 hole

Claims (3)

[Claims] 1. A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are eccentric to each other, and are displaced in phase to be meshed with each other. In a scroll type fluid machine in which a fixed scroll is fixed to the housing and the orbiting scroll revolves orbitally, at least three cylinders are protruded from an outer surface of an end plate of the orbiting scroll, and the same number of rings as the cylinders are provided. The cylinder is rotatably embedded in the housing, and each of the cylinders is rotatably inserted into a hole formed in the ring at a position eccentric from a center of rotation of the ring by a distance corresponding to a revolution radius of the orbiting scroll. A scroll type fluid machine characterized by the above-mentioned. 2. A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are eccentric to each other, and are displaced in phase to be meshed and disposed inside the housing. In a scroll type fluid machine in which a fixed scroll is fixed to the housing and the orbiting scroll revolves orbitally, the fixed scroll and the orbiting scroll have a tip seal embedded in an inner circumferential end surface of a spiral wrap. A scroll type fluid machine wherein a narrower tip seal is embedded on the outer peripheral side thereof. 3. A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are eccentric to each other, and are arranged in a phase-shifted manner inside a housing. In a scroll-type fluid machine in which a fixed scroll is fixed to the housing and the orbiting scroll revolves orbitally, a rotating boss is provided inside a cylindrical boss protruding from a center of an outer surface of an end plate of the orbiting scroll. A scroll-type fluid machine, wherein a drive bush and a balance weight rotatably fitted are integrally formed with an inner end of a rotating shaft penetrating the housing.