JPH06346867A - Scroll fluid machinery - Google Patents

Abstract

PURPOSE:To provide a scroll fluid machine simple in structure at a low cost. CONSTITUTION:A drive bush 5 is rotatably fitted by insertion to a turning scroll engaged with a fixed scroll, and a driving pin 9 protruding from the end face of a rotary shaft 8 is slidably fitted into a slide hole 7 bored in the drive bush 5. The drive bush 5 is then provided with a balance weight 10a for balancing dynamic unbalance caused by the revolving motion of the turning scroll. In such a scroll fluid machine, a part of the balance weigh 10a is formed to be opposed to the side part of the rotary shaft 8, and the outer end of a pin 23 protrusively provided in the radial direction of the rotary shaft 8 while being fixed at one end thereof to the side part of the rotary shaft 8 is fitted with play into a hole bored in the radial direction of the balance weight 10a in such a way as to secure the sliding of the driving pin 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine used as a compressor, an expander or the like.

[0002]

2. Description of the Related Art For example, in a conventional scroll type compressor, as shown in the longitudinal sectional view of FIG. 2 and the transverse sectional view of FIG. 3, 1 is a fixed scroll, which is an end plate 1a and a spiral erected on its inner surface. 2 is a revolving scroll and is composed of an end plate 2a and a spiral wrap 2b provided upright on the inner surface thereof. The fixed scroll 1 and the orbiting scroll 2 are eccentric by twice the orbiting radius r, and 1
A plurality of compression chambers 3 are limit-formed in point symmetry with respect to the center of the spiral by shifting the angle by 80 degrees and engaging with each other as illustrated. End plate 2 of orbiting scroll 2
A cylindrical boss 4 is provided at the center of the outer surface of a, and a drive bush 5 is rotatably fitted in the boss 4 via a bearing 6. In the slide hole 7 formed in the drive bush 5, the shaft center 0 ₁
A drive pin 9 that is eccentrically protruded by a turning radius r is fitted to be slidable along the longitudinal direction of the slide hole 7. A balance weight 10 is fixed to the drive bush 5 to balance the dynamic unbalance caused by the orbiting movement of the orbiting scroll 2. A pin 16 is inserted into a pin hole 15 penetrating each of the upper end portion of the rotary shaft 8 and the balance weight 10, and a push nut 17 made of a thin spring plate fitted from the tip end portion of the pin 16 has a spring. The balance weight 10 is restrained by the function through the washer 18. In such a structure, when the rotating shaft 8 rotates, this rotating force is transmitted to the orbiting scroll 3 via the drive pin 9, the drive bush 5, the bearing 6, and the boss 4, and the orbiting scroll 2 is rotated by a rotation preventing mechanism (not shown). In a state in which the rotation is blocked, a revolving orbiting motion is performed on a circular orbit centered on the axial center 0 ₁ of the rotary shaft 8 and having an eccentricity r as a radius. Then, the gas taken into the compression chamber 3 is gradually compressed as it moves toward the center of the vortex while reducing the volume of the compression chamber 3 and reaches the central small chamber 11, from which the discharge port 12 is discharged. It is then discharged. When the orbiting scroll 2 revolves around the revolution, the drive bush 5 and the balance weight 10 fixed to the drive bush 5 tend to incline in the direction of the arrow in FIG. Is prevented from hitting the bearing 6 in one direction.

[0003]

However, in the conventional scroll type compressor of this type, the pin 15, the push nut 17, and the washer are used to control the tilting of the drive bush 5 and the balance weight 10 fixed to the drive bush 5. Since many components such as 18 were used, the cost was increased.

The present invention has been proposed in view of such circumstances, and an object thereof is to provide a scroll type fluid machine having a simple structure and low cost.

[0005]

To this end, according to the present invention, a drive bush is rotatably fitted into an orbiting scroll that meshes with a fixed scroll, and a drive shaft is inserted into a slide hole formed in the drive bush from an end surface of a rotary shaft. In a scroll type fluid machine in which a protruding drive pin is slidably fitted and a balance weight is provided in the drive bush to balance the dynamic unbalance due to the revolution orbiting motion of the orbiting scroll, a part of the balance weight is It is formed so as to face the side portion of the rotary shaft, and one end is fixed to the side portion of the rotary shaft, and the outer end of the pin protruding in the radial direction of the rotary shaft is arranged in the radial direction of the balance weight. It is characterized in that it is loosely fitted in the bored hole so as to secure the slide of the drive pin.

[0006]

According to this structure, when the orbiting scroll orbits the orbiting scroll, the drive bush and the balance weight provided thereto tend to incline, but the pin contacts the inner surface of the hole formed in the balance weight. The tilt can be regulated by touching.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the present invention is shown in FIG.

In the above figure, the same reference numerals as in FIG. 2 indicate the same members as in the same figure, and the balance weight 10a maintains a proper weight and center of gravity, and a part of the balance weight 10a has a rotary shaft 8a.
Is formed so as to project downward so as to face the upper end side portion of the. Concentric radial pin holes 21 and 22 are formed in the upper end portion of the rotary shaft 8 and the balance weight 10a facing each other, and the inner end of the pin 23 is located on the rotary shaft side 8. It is fixed in a state of being press-fitted into the pin hole 21. The pin 23 is arranged in the radial direction of the rotary shaft 8, in this example, in the direction orthogonal to the longitudinal direction of the slide hole 7 provided in the drive bush 5, and the outer end thereof is a through hole 22 on the balance weight 10 side. Is loosely fitted to. The inner diameter of the through hole 22 on the side of the balance weight 10a is set to be slightly larger than the outer diameter of the pin 23 and has a minute gap between the two, so that the pin 23 can be driven by being inserted with play. A smooth slide movement of the pin 9 in the slide hole 7 is ensured. The pin 23 is assembled by assembling the drive bush 5 to the drive pin 9 and then inserting the drive bush 5 into the through hole 22 and the blind hole 21 from the outer end side of the balance weight 10a. And the conventional one shown in FIG.

In such a structure, the drive bush 5 and the balance weight 10a fixed to the drive bush 5 tend to incline when the orbiting scroll 2 revolves, but the pin 23 is a through hole in the radial direction on the balance weight 10 side. Two
The tilting of the drive bush 5 can be restricted by abutting against the inner surface of the drive bush 2, so that the drive bush 5 can be prevented from hitting the bearing 6 one-sided. Here, the pin 23 and the through hole 22
The smaller the gap between and, the smaller the degree of tilt can be regulated. Thus, in this embodiment, the pin 23
Since the tilting of the drive bush 5 and the like can be restricted only by this, the number of parts can be reduced as compared with the conventional case. Further, in the case of the pin 23 of the present embodiment, there is an advantage that it is possible to improve accuracy and stability because of the processing of the round hole.

[0010]

According to this structure, the tilting of the drive bush and the balance weight can be restricted by the pin, so that the number of parts and the number of assembling steps can be reduced as compared with the conventional case, and the cost can be reduced. Can be lowered.

In short, according to the present invention, the drive bush is rotatably fitted into the orbiting scroll meshing with the fixed scroll, and the drive pin protruding from the end face of the rotary shaft is inserted into the slide hole formed in the drive bush. In a scroll type fluid machine, which is slidably fitted, and in which a balance weight is provided in the drive bush to balance the dynamic unbalance due to the revolving orbiting motion of the orbiting scroll, a part of the balance weight is provided on the rotary shaft side. Hole formed in the radial direction of the balance weight so that one end is fixed to the side portion of the rotary shaft and the outer end of the pin projecting in the radial direction of the rotary shaft is formed so as to face the portion of the balance weight. The scroll-type fluid machine has a simple structure and low cost because it is loosely fitted to the drive pin so as to secure the slide of the drive pin. From getting, the present invention is the extremely valuable industrial.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view showing a main part of a scroll type compressor according to an embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view showing a conventional scroll compressor.

3 is a cross-sectional view taken along the line III-III of FIG.

[Explanation of symbols]

 1 Fixed scroll 2 Orbiting scroll 4 Boss 5 Drive bush 7 Slide hole 8 Rotating shaft 9 Drive pin 10a Balance weight 21, 22 hole 23 Pin

Claims (1)

[Claims] 1. A drive bush is rotatably fitted into an orbiting scroll meshing with a fixed scroll, and a drive pin protruding from an end face of a rotary shaft is slidably fitted into a slide hole formed in the drive bush. In addition, in the scroll type fluid machine in which the drive bush is provided with the balance weight for balancing the dynamic unbalance due to the revolution orbiting motion of the orbiting scroll, a part of the balance weight is opposed to the side portion of the rotary shaft. And one end of which is fixed to the side portion of the rotary shaft, and the outer end of the pin which is projected in the radial direction of the rotary shaft is formed in the hole formed in the radial direction of the balance weight. A scroll type fluid machine characterized by being loosely fitted to secure a slide.