JP2002202075A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a whole structure by reducing numbers of parts in a self-rotation prevention mechanism. SOLUTION: Three tube body fitting holes 18 are provided on a thrust bearing 7 of a casing 1 at intervals in a circumferential direction. Eccentric tube bodies 19 of material having self-lubricating property are rotatably fitted in the tube body fitting holes 18. An eccentric hole 19B is provided on the eccentric tube body 19 at an eccentric position from an outer circumference surface 19A by a turning radius δ of a turning scroll 12. Three fitting shafts 20 are provided on a back surface of an end plate 12A of the turning scroll 12 at intervals in the circumferential direction. The fitting shafts 20 are rotatably fitted in the eccentric holes 19B of the eccentric tube bodyies 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine suitable for use in an air compressor, a vacuum pump, and the like.

[0002]

2. Description of the Related Art Generally, a scroll type fluid machine includes a casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing,
A revolving scroll that is rotatably provided at the tip end of the drive shaft and defines a plurality of compression chambers with the fixed scroll.

[0003] In this type of scroll type fluid machine according to the prior art, a drive shaft is rotationally driven from the outside, and an orbiting scroll is caused to orbit with a fixed eccentricity with respect to a fixed scroll, so that air sucked from a suction port is sucked. And the like are sequentially compressed in a compression chamber defined between the fixed scroll and the orbiting scroll, and the compressed fluid is discharged from the discharge port to the outside.

[0004] Some conventional scroll-type fluid machines have a structure in which an auxiliary crank mechanism serving as a rotation preventing mechanism is provided between a casing and the orbiting scroll in order to prevent the orbiting scroll from rotating. For example, JP-A-11-101185 and the like.

The auxiliary crank mechanism includes an auxiliary crank having a casing side shaft and a scroll side shaft, and a casing side supporting the casing side shaft of the auxiliary crank rotatably with respect to the casing. It comprises a ball bearing and a scroll-side ball bearing that rotatably supports the scroll-side shaft portion of the auxiliary crank with respect to the orbiting scroll.

[0006]

By the way, in the scroll type fluid machine according to the prior art described above, an auxiliary crank mechanism serving as a rotation preventing mechanism has a total of three auxiliary cranks,
A total of three ball bearings on the casing side that rotatably support each of these auxiliary cranks with respect to the casing, and a total of three ball bearings on the scroll side that rotatably support each auxiliary crank with respect to the orbiting scroll. However, there is a problem that the number of parts constituting the auxiliary crank mechanism increases, the overall structure becomes complicated, and the cost increases.

The casing and the ball bearings on the scroll side are filled with grease in order to maintain the lubricity of each. However, due to the compression heat generated during operation,
There is a problem that grease leaks from each of these bearings, and the lubricity of the ball bearings tends to decrease.

Further, since each ball bearing needs to be mounted by press-fitting between the auxiliary crank and the casing and between the auxiliary crank and the orbiting scroll, the number of man-hours required for mounting the respective bearings is increased. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the number of parts of the anti-rotation mechanism to simplify the entire structure and to eliminate the need for a lubricant such as grease. It is an object of the present invention to provide a scroll-type fluid machine capable of improving the workability when mounting the anti-rotation mechanism.

[0010]

Means for Solving the Problems] To solve the problems described above, the scroll fluid machine according to the present invention includes a casing, a fixed scroll provided in the casing,
A drive shaft rotatably provided on the casing, a orbiting scroll defining a plurality of compression chambers between the drive shaft and the fixed scroll provided at the tip end of the drive shaft, and a rotation of the orbiting scroll. And a rotation preventing mechanism for preventing rotation.

A feature of the structure adopted by the first aspect of the present invention is that the rotation preventing mechanism includes a cylindrical fitting hole formed of a circular hole provided on one of the casing and the back surface of the orbiting scroll. Is formed in a cylindrical shape using a material having self-lubricating properties, is rotatably fitted in the cylindrical body fitting hole, and has an inner peripheral side eccentric with respect to an outer peripheral surface by a size corresponding to a turning radius of the orbiting scroll. An eccentric cylindrical body having an eccentric hole and a fitting shaft provided on the other of the rear surface of the casing and the orbiting scroll and rotatably fitted to the eccentric hole of the eccentric cylindrical body are provided.

With this configuration, the eccentric hole of the eccentric cylinder is eccentrically arranged with respect to the outer peripheral surface of the eccentric cylinder by a dimension corresponding to the turning radius of the orbiting scroll. While the fitting shaft provided in the scroll rotates in the eccentric hole of the eccentric tubular body, the eccentric tubular body itself rotates in a tubular fitting hole provided in the casing, for example, so that the rotation of the orbiting scroll can be prevented, and The scroll can perform a turning motion having a fixed turning radius.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll type air compressor will be described as an example of a scroll type fluid machine according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings of FIGS.

Reference numeral 1 denotes a casing forming an outer frame of the scroll type air compressor. The casing 1 includes a lower motor case 2 having a bottomed cylindrical shape, and a closed cylinder disposed above the motor case 2. The motor case 3 includes an upper motor case 3 and a thrust receiver 7 provided in the motor case 3 and described later. An annular flange 3A is integrally formed on the outer peripheral side of the upper end of the motor case 3.

An electric motor 4 is accommodated and provided in the motor cases 2 and 3. The electric motor 4 includes a stator 5 fixedly provided between the motor cases 2 and 3 and a stator 5. 5 is constituted by a rotor 6 provided on the inner peripheral side and a drive shaft 9 described later.

Numeral 7 denotes a thrust receiver fixedly provided on the motor case 3 of the casing 1. The thrust receiver 7 has an annular plate portion 7A and an annular plate portion 7A as shown in FIGS. A plurality of cylindrical portions 7B, 7B,... Extending downward from the outer peripheral side at intervals in the circumferential direction.

The cylindrical portion 7B of the thrust receiver 7 is fixed to the flange portion 3 of the motor case 3 by a fixing bolt 8D described later.
A is fixed to A and receives a thrust load acting on the orbiting scroll 12 by slidingly contacting the orbiting scroll 12.

Reference numeral 8 denotes a fixed scroll provided on the thrust receiver 7 of the casing 1. The fixed scroll 8 includes a disk-shaped end plate 8A disposed so as to coincide with an axis of a driving shaft 9 described later, It is composed of a spiral wrap portion 8B erected on the surface of the end plate 8A and a cylindrical portion 8C protruding downward from the outer edge side of the end plate 8A. The fixed scroll 8 is integrally attached to the motor case 3 together with the thrust receiver 7 using a fixing bolt 8D or the like.

Reference numeral 9 denotes a drive shaft rotatably provided on the motor cases 2 and 3 of the casing 1 via bearings 10 and 11, respectively. The drive shaft 9 has a lower end (base end) of the electric motor 4 at its lower end. It is integrally attached to the rotor 6 and has an axis O1-O1. The upper end side (tip side) of the drive shaft 9 is a cylindrical boss 9A. The boss 9A has an axis O2-O2 that is parallel to the axis O1-O1 of the drive shaft 9, as shown in FIG. Eccentric by the dimension δ.

Reference numeral 12 denotes an orbiting scroll which is provided at the upper end of the drive shaft 9 so as to face the fixed scroll 8 and is capable of turning.
The orbiting scroll 12 has an end plate 12 formed in a disk shape.
A and a spiral wrap portion 12B provided upright on the front side of the end plate 12A. The orbiting scroll 12 has a columnar projection 12C projecting downward from the center of the rear surface of the end plate 12A, and an annular flange 12D is integrally formed on the outer periphery of the lower end of the columnar projection 12C.

The orbiting scroll 12 has a cylindrical projection 12C with a boss 9A of the drive shaft 9 via an orbiting bearing 13.
It is provided rotatably inserted in the inside. Here, the orbiting bearing 13 is configured as a thrust radial bearing, and the annular flange portion 12D of the orbiting scroll 12 is brought into contact with the orbiting bearing 13. It is configured to be received together with.

The orbiting scroll 12 is disposed so as to overlap the wrap portion 8B of the fixed scroll 8 by, for example, 180 degrees, and the wrap portions 8B, 1 of the two scrolls are provided.
A plurality of compression chambers 14, 14,... Are defined between 2B. During the operation of the scroll type air compressor, the air is sucked into the compression chamber 14 on the outer peripheral side from the suction port 15 provided on the outer peripheral side of the fixed scroll 8, and the orbiting scroll 12 is rotated by the drive shaft 9 to move the air. While each compression chamber 1
The compressed air is sequentially compressed in the compressor 4, and finally compressed air is discharged from the compression chamber 14 on the center side to the outside through a discharge port 16 provided at the center of the fixed scroll 8.

Reference numerals 17, 17,... Denote three anti-rotation mechanisms provided between the thrust receiver 7 of the casing 1 and the back surface of the end plate 12A of the orbiting scroll 12.
Is constituted by a tube fitting hole 18, an eccentric tube 19, and a fitting shaft 20 described later. And the anti-rotation mechanism 17
Is configured to prevent rotation of the orbiting scroll 12 and to give the orbiting scroll 12 a circular motion (orbiting motion) having a turning radius of a dimension δ (hereinafter referred to as a turning radius δ).

Reference numerals 18, 18,... Denote cylindrical fitting holes provided in the annular plate portion 7A of the thrust receiver 7 at intervals in the circumferential direction.
The cylindrical body fitting hole 18 is formed as a circular bottomed hole, in which an eccentric cylindrical body 19 is fitted and accommodated.

Reference numerals 19, 19, ... denote eccentric cylinders which are rotatably provided in the cylinder fitting holes 18B.
Numeral 9 is formed in a tubular shape using a self-lubricating rubber material such as fluoro rubber (FKM).

Here, the outer peripheral surface 19A of the eccentric cylinder 19 has an axis O3-O3 as shown in FIGS. The cylindrical body fitting hole 19 has an eccentric hole 19B on the inner peripheral side, and the axis O4-O4 of the eccentric hole 19B has a turning radius δ in the radial direction from the axis O3-O3 of the outer peripheral surface 19A of the eccentric cylindrical body 19. It is arranged at a position that is only eccentric. The eccentric cylinder 19 rotates in the cylinder fitting hole 18 with the turning operation of the orbiting scroll 12.

Reference numerals 20, 20,... Denote fitting shafts provided on the back side of the end plate 12A of the orbiting scroll 12 at intervals in the circumferential direction.
It is configured as a pin shaft projecting downward from the back. The fitting shaft 20 is provided with an eccentric hole 19 of the eccentric cylinder 19.
B is rotatably fitted and inserted into B.

The scroll-type air compressor according to the present embodiment has the above-described configuration. Next, the operation of the scroll-type air compressor will be described.

First, when the drive shaft 9 is rotated by the electric motor 4 and the orbiting scroll 12 is turned, the compression chamber 14 defined between the wrap portion 8B of the fixed scroll 8 and the wrap portion 12B of the orbiting scroll 12 is formed. , 14,... Are continuously reduced. As a result, while the outside air sucked from the suction port 15 of the fixed scroll 8 is sequentially compressed in each compression chamber 14, the compressed air is stored from the discharge port 16 of the fixed scroll 8 in an external air tank (not shown) or the like. .

When the orbiting scroll 12 orbits as described above, the fitting shaft 20 on the orbiting scroll 12 side is used.
While relatively rotating inside the eccentric hole 19B of the eccentric cylinder 19,
The eccentric cylinder 19 itself is connected to the cylinder fitting hole 1 on the thrust receiver 7 side.
By rotating inside the orbit 8, the orbiting scroll 12 is prevented from rotating, and performs a orbital motion (orbital motion) with a orbital radius δ about the axis O1-O1 of the drive shaft 9.

Thus, in the present embodiment, the eccentric cylinder 19 constituting the rotation preventing mechanism 17 is formed by using a material having self-lubricating properties. In addition to being able to rotate smoothly within the mating hole 18, the fitting shaft 20 is able to rotate smoothly within the eccentric hole 19 </ b> B of the eccentric cylinder 19, and between the cylinder fitting hole 18 and the eccentric cylinder 19, There is no need to provide a complicated mechanism such as a ball bearing as described in the related art between the eccentric cylinder 19 and the eccentric cylinder 19.

Thus, the anti-rotation mechanism 17 is connected to the eccentric cylinder 1
The structure can be simplified simply by using the two members 9 and the fitting shaft 20, the entire structure of the rotation preventing mechanism 17 can be simplified, and the total number of parts can be reduced. Also, since the eccentric cylinder 19 has self-lubricating properties, the cylinder fitting hole 18
There is no need to fill grease between the fitting shaft 20 and the eccentric cylinder 19 between the eccentric cylinder 19 and the eccentric cylinder 19, and problems such as grease leakage can be eliminated.

When the anti-rotation mechanism 17 is mounted, the eccentric cylinder 19 is fitted into the cylinder fitting hole 18 on the thrust receiver 7 side, and then the fitting shaft 20 on the orbiting scroll 12 is fitted to the eccentric cylinder 1.
The mounting work of the anti-rotation mechanism 17 can be performed only by fitting the eccentric hole 19B into the eccentric hole 19B, and the labor for press-fitting and mounting the ball bearing as described in the related art can be omitted, thereby improving the workability at the time of mounting. can do.

In this embodiment, the rotation preventing mechanism 17 is used.
Is described as an example in which three parts are provided between the thrust receiver 7 of the casing 1 and the orbiting scroll 12, but instead of this, for example, as in a first modification shown in FIG. The anti-rotation mechanism 17 ′ including the cylinder fitting hole 18 ′, the eccentric cylinder 19 ′, and the fitting shaft 20 ′ may be provided at four places between the casing 1 and the orbiting scroll 12, or may be provided at five or more places. It may be. Here, the eccentric cylinder 19 'is formed by an outer peripheral surface 19A' and an eccentric hole 19B '.
have.

In the embodiment, the anti-rotation mechanism 17
Is provided with a cylindrical fitting hole 18 on the thrust receiver 7 side, an eccentric cylindrical body 19 is provided in the cylindrical fitting hole 18 and the fitting shaft 2
0 has been described as an example provided on the orbiting scroll 12 side, but instead of this, for example, as in a second modification shown in FIG. The hole 18 "may be provided on the orbiting scroll 12, the eccentric tube 19" may be provided in the tube fitting hole 18 ", and the fitting shaft 20" may be provided on the thrust receiver 7 side. The eccentric cylindrical body 19 "has an outer peripheral surface 19A" and the eccentric hole 1
9B ".

Further, in each of the embodiments, the scroll type air compressor has been described as a scroll type fluid machine. However, the present invention is not limited to this, and can be widely applied to, for example, a refrigerant compressor. is there.

[0037]

As described above in detail, according to the first aspect of the present invention, one of the casing and the orbiting scroll is provided with a cylindrical fitting hole formed of a circular hole. In the fitting hole, an eccentric tubular body formed into a tubular shape using a material having self-lubricating properties is fitted and provided. In the eccentric hole of the eccentric tubular body, the other member of the casing and the orbiting scroll is provided. The rotation of the orbiting scroll allows the eccentric cylindrical body to rotate smoothly in the cylindrical fitting hole, and the fitting shaft to be eccentric to the eccentric cylindrical body. It can rotate smoothly in the hole 19, and between the cylinder fitting hole and the eccentric cylinder, and between the fitting shaft and the eccentric cylinder,
There is no need to provide a complicated mechanism such as a ball bearing as described in the related art.

Thus, the anti-rotation mechanism can be simply constructed by using only the two members of the eccentric cylinder and the fitting shaft, so that the entire structure of the anti-rotation mechanism can be simplified and the total number of parts can be reduced. . In addition, since the eccentric cylinder has self-lubricating properties, it is not necessary to fill grease between the cylinder fitting hole and the eccentric cylinder, and between the fitting shaft and the eccentric cylinder, which causes a problem such as grease leakage. Can be eliminated. further,
When mounting the anti-rotation mechanism, the mounting work can be performed simply by fitting the eccentric cylinder into the cylinder fitting hole and then fitting the fitting shaft into the eccentric hole of the eccentric cylinder. As described above, the labor for press-fitting and mounting the ball bearing can be omitted, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a turning scroll, a thrust receiver, a rotation preventing mechanism, and the like in FIG. 1;

FIG. 3 is an exploded perspective view showing a thrust receiver, an orbiting scroll, and a rotation preventing mechanism in FIG. 1;

FIG. 4 is a cross-sectional view of the cylinder housing hole, the eccentric cylinder, a fitting shaft, and the like, as viewed from the direction of arrows IV-IV in FIG.

FIG. 5 is a perspective view showing the eccentric cylindrical body in FIG. 4 alone;

FIG. 6 is an exploded perspective view showing a thrust receiver, an orbiting scroll, and a rotation preventing mechanism of a scroll fluid machine according to a first modification of the present invention.

FIG. 7 is a cross-sectional view of a main part of a scroll type fluid machine according to a second modified example of the present invention, showing the orbiting scroll, thrust receiver, rotation preventing mechanism, and the like, as viewed from the same position as in FIG.

[Explanation of symbols]

 Reference Signs List 1 casing 7 thrust receiver 8 fixed scroll 9 drive shaft 12 orbiting scroll 14 compression chamber 17, 17 ', 17 "rotation prevention mechanism 18, 18', 18" cylinder fitting hole 19, 19 ', 19 "eccentric cylinder 19A , 19A ', 19A "Eccentric hole 20, 20', 20" Fitting axis δ Turning radius

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Inoue 1116 Koen, Ayase-shi, Kanagawa F-term in Tokiko Corporation Sagami Plant (reference) 3H039 AA01 AA09 AA12 BB07 BB08 BB11 CC02 CC08 CC15 CC33

Claims (1)

[Claims] 1. A casing, a fixed scroll provided on the casing, a drive shaft rotatably provided on the casing, and a fixed scroll provided rotatably on a distal end side of the drive shaft. In a scroll type fluid machine including a orbiting scroll defining a plurality of compression chambers and a rotation preventing mechanism for preventing rotation of the orbiting scroll, the rotation preventing mechanism may be any one of the casing and the rear surface of the orbiting scroll. A cylindrical fitting hole formed of a circular hole provided on one of the cylindrical body and a cylindrically formed material made of a material having self-lubricating properties, which is rotatably fitted into the cylindrical body fitting hole and whose inner peripheral side has an outer peripheral surface. An eccentric cylindrical body having an eccentric hole eccentric by a dimension corresponding to the turning radius of the orbiting scroll,
A scroll-type fluid machine comprising: a casing; and a fitting shaft provided on the other of the back surfaces of the orbiting scroll and rotatably fitted in an eccentric hole of the eccentric cylinder.