JPH056035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a scroll type fluid device, and particularly to a structure suitable for reducing the weight of a balance weight and simplifying the structure.

[Prior Art] Figure 1 shows the structure of a scroll fluid device.
As shown in FIG. 2, the conventional rotation prevention structure for an orbiting scroll is as follows: After a crankshaft 7 integrated with a balance weight 12 is assembled into a frame 9, a toric-shaped rotation stopper plate 10 is fitted into the frame 9. It is fixed with a set screw, and a pair of keys 1 are attached to the rotation stop plate 10.
0a, and the key 10a is attached to the Oldham ring 11.
It was designed to fit into a keyway on the bottom to stop the orbiting scroll from rotating. For this reason, it is necessary to machine the screw hole, inner peripheral surface, and receiving surface of the rotation stopper plate 10 in the frame 9 to prevent rotation of the rotation stopper plate 10, which requires a large amount of man-hours and has the disadvantage of requiring many parts. Was.

[Object of the Invention] An object of the present invention is to specify the shape of the Oldham key receiving surface in accordance with the shape of the balance weight, thereby simplifying assembly and reducing the number of parts.

[Structure of the Invention] In order to achieve the above object, a scroll fluid device according to the present invention has an orbiting scroll and a fixed scroll each consisting of an end plate and a spiral wrap standing upright on the end plate, and both scrolls are wrapped around each other. An orbiting scroll anti-rotation mechanism is designed to allow relative movement of both scrolls so that the space formed by each wrap and end plate decreases in volume as it moves toward the center of the scroll. A pair of keys or key grooves provided perpendicularly to each other on the upper and lower surfaces of the Oldham ring are slidably fitted into key grooves or keys provided on the back side of the orbiting scroll head plate and the frame side, respectively. In a scroll fluid machine in which a balance weight fixed to a crankshaft is housed in an internal cavity of a frame on the rear side of the Oldham ring, the receiving surface of the Oldham ring is made narrow on at least one side of the key or keyway on the frame side. The balance weight is formed as a partial inward protrusion on the diameter line of the frame, and between the partial protrusion and the inner circumferential surface of the frame, a balance weight having a fan-shaped planar shape is inserted from above while being assembled to the crankshaft. It is characterized by forming an air space through which it can be inserted.

[Embodiments of the Invention] Examples of the present invention will be described with reference to FIGS. 4 to 6. An orbiting scroll 1 having a spiral wrap 1b standing upright on a mirror plate 1a is combined with a fixed scroll 2 with the wraps facing inward,
You can receive it in frame 9. An orbiting bearing 3 and an Oldham ring 12 as a rotation prevention mechanism are provided on the back surface of the orbiting scroll 1, and a crank portion of a crankshaft 7 is inserted into the orbiting bearing 3.

The Oldham ring 12 is provided with a pair of keys 12a on the upper surface along its diameter line, and a pair of keys 12a on the lower surface perpendicular thereto. A pair of keys 12a on the lower surface that are perpendicular to the key groove are connected to a pair of key grooves 9c on the frame side.
The rotating scroll 1 is configured to be slidably fitted into each of the scroll members 1 and 2 to prevent the orbiting scroll 1 from rotating.

On the other hand, a balance weight 8 fixed to the crankshaft 7 is housed in the internal cavity of the frame 9 on the lower surface side of the Oldham ring 12, and the balance weight 8 balances the unbalanced force caused by the orbiting motion of the orbiting scroll 1.

As shown in FIG. 5, the receiving surface 9b for receiving the Oldham ring 12 on the frame 9 side is formed as a partial protrusion inward on the diametrical line of the frame 9 with a small width on both sides of the keyway 9c. Alternatively, as shown in FIG. 6, only one side of the keyway 9c is made narrower, and is formed as a partial inward protrusion on the diameter line of the frame 9.

A sufficiently large air space is secured between the partial protrusion, which has a small width on the receiving surface 9b on the frame 9 side that receives the Oldham ring 12, and the inner peripheral surface of the frame 9, and a fan-shaped air space is formed through the air space. The structure is such that the formed balance weight 8 can be assembled from above while remaining attached to the crankshaft 7.

[Effects of the Invention] According to the present invention, it is possible to assemble the balance weight into the frame while it is attached to the crankshaft, and the assembly efficiency is greatly improved. Further, the rotation stopper plate of the Oldham ring, the set screw, etc. are unnecessary, and the number of parts can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the conventional structure, Fig. 2 is a plan view and side view of the rotation stop plate, Fig. 3 is a top view of the conventional frame before the rotation stop plate is attached, and Fig. 4 is an embodiment of the present invention. 5 and 6 are top views of the frame of the embodiment of the present invention. 1... Orbiting scroll, 2... Fixed scroll, 3... Orbiting bearing, 4... Chamber, 5... Suction pipe, 6... Discharge pipe, 7... Crankshaft, 8...
Main bearing, 9...frame, 10...rotation stop plate,
11, 13...Oldham ring, 12...Balance weight.

Claims (1)

[Claims] 1. It has an orbiting scroll and a fixed scroll consisting of an end plate and a spiral wrap standing upright on the end plate, and both scrolls are combined with each other with the wraps facing inward, and each lap and end plate In order to cause the scrolls to move relative to each other so that the space formed decreases in volume as it moves toward the center of the scroll, an Oldham ring is provided as an orbiting scroll rotation prevention mechanism, and the upper surface of the Oldham ring is provided. and a pair of keys or key grooves provided perpendicularly to each other on the lower surface are slidably fitted into key grooves or keys provided on the back side of the orbiting scroll end plate and the frame side, respectively, and the inner cavity of the frame on the back side of the Oldham ring is In a scroll fluid device that houses a balance weight fixed to a crankshaft, the receiving surface of the Oldham ring is made narrow on at least one side of the key or keyway on the frame side to form a partial inward protrusion along the diameter line of the frame. between the partial protrusion and the inner peripheral surface of the frame,
A scroll fluid device characterized by forming an air space in which a balance weight having a sector-shaped planar shape can be inserted and assembled from above while being attached to a crankshaft.