JPS61116001A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To aim at simplifying the arrangement of a scroll type fluid machine, by providing flanged pin cranks each having upper and lower thrust bearings provided with radial bearings, between a turning scroll base plate and a casing at several positions to prevent the revolution and thrust load of the turning scroll. CONSTITUTION:A rotary shaft 5 provided with a crank shaft 5a is rotatably journalled to the center section of a casing 2 connected to the lower section of a stationary scroll 1 by means of bearings 3, 4. Further, a turning scroll 6 is rotatably and movably in the axial direction thereof fitted onto the crank shaft 5a through the intermediary of a needle bearing 7. Further, flanged pin cranks 9 are arranged to be opposed one and another at several positions between the lower surface of base plate 6a of the turning scroll 6 in the vicinity of the outer periphery thereof, and the inner wall of the casing 2, and thrust bearings 10 provided with radial bearings are attached to both flange surfaces of each crank pin. Further, the flanged crank pins 9 prevent the revolution of the turning scroll 6 and support thrust load, and gaps between the tops of laps 1c, 6b of the scrolls 1, 6 are maintained at a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scroll type fluid machine, and particularly to a rotation prevention and thrust load supporting device for an orbiting scroll.

[Conventional technology]

Conventionally, there has been a means for preventing the rotation of an orbiting scroll in a scroll type fluid machine and for supporting a thrust load, as disclosed in, for example, Japanese Unexamined Patent Publication No. 150993/1983.

That is, as shown in FIG. 3, the orbiting scroll 102 that engages with the fixed scroll 101 is rotatably supported by a rotating shaft 106 with a crankshaft 106a supported in the casing 103 via bearings 104 and 105. .The casing 103 has seven flange 103a toward the inside.
An Oldham pin 107 for preventing rotation and a thrust bearing 1 are provided between the seven flange 103& and the base plate 10211 of the orbiting scroll 102 located above it.
08a and 108b are interposed separately.

[Problem that the invention seeks to solve]

It is difficult to prevent the sliding seats of the thrust bearings 108a and 108b, that is, the base plate 102a and the flange 103a, and if the thrust bearings 108a and 108b are made independent with the sliding seats, it is difficult to prevent them from wearing out because of their large diameter. This poses a problem in terms of cost.

In addition, if you try to make it oil-free from the viewpoint of use, etc., as shown in the same figure (if the labyrinth 109 and the high-pressure gas feed path 110 etc. are not provided), the Oldham bin 10
7 and thrust bearings 108a-b cannot be lubricated. The present invention provides a scroll-type rotating machine which uses commercially available parts to both prevent the rotation of an orbiting scroll and support thrust loads, and which can also be easily made oil-free if necessary. This is the purpose.

[Means for solving problems]

The orbiting scroll is rotatably and axially movably supported on a crankshaft, and the orbiting scroll has flanged bin cranks arranged at multiple locations between the lower surface of the substrate and the casing and having the same eccentricity as the crankshaft. However, the pin crank is supported both on the orbiting scroll side and on the casing side by commercially available radial bearing thrust bearings, so that the thrust bearing portion also functions to prevent rotation of the orbiting scroll.

[Effect]

Rotation of the orbiting scroll is prevented by multiple pin cranks having radial bearings and thrust bearings on both sides, and the thrust charging of the orbiting scroll is supported by the pin cranks and the casing.

Although the radial bearing thrust bearing itself uses a commercially available small-diameter one, it can be installed at a large diameter part near the outer periphery of the orbiting scroll, so it can be stabilized by having two or more locations. It can be used as a thrust bearing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, reference numeral 1 denotes a fixed scroll which also serves as an upper cover, and has a suction port 1a' on the outer circumference and a discharge port 1b in the center.

Reference numeral 2 denotes a casing connected to the lower part of the fixed scroll 1, in which a rotary shaft 5 with a crankshaft 5a is rotatably supported in the center by bearings 3 and 4.

Reference numeral 6 denotes an orbiting scroll which is fitted into the crank 11115M so as to be rotatable and movable in the axial direction by means of a needle bearing 7.
An oil seal 8 is provided at the inlet of the bearing 7 to enable oil retention within the bearing.

Reference numeral 9 denotes flanged bottle cranks which are disposed facing each other at a plurality of locations between the lower surface near the outer periphery of the base plate 6a of the orbiting scroll 6 and the inner wall of the casing, which have the same eccentricity as the crankshaft 5a, and have radial bearing thrusts on both sides of the flanges. A bearing 10 is provided, and 10 m is a grease sealing ring for the thrust bearing.

In addition, 11 is the lower cover and 112 is the balance weight.

Reference numeral 13 designates a reverse valve, which is not shown in the drawings, but is conventionally known in that a mechanical seal is interposed above the bearing 3 to prevent the pressure inside the casing 2 from leaking to the bearings 3, 4, etc. It has the same configuration as .

When the operation starts, the orbiting scroll 6 performs an orbiting motion around the rotating shaft 5, and suction and compression are performed by the action of the lap IC 6b of the fixed scroll 1 and the orbiting scroll 6.

In this case, due to the presence of the flanged bin cranks 9 which are arranged oppositely at a plurality of locations and have radial bearing thrust bearings 10 on their upper and lower surfaces, the rotation action of the orbiting scroll 6 is prevented, and the thrust load is also reduced from both thrusts. It is held by the casing 2 via bearings. Furthermore, even if the rotating shaft 5 expands due to thermal expansion due to continuous operation, etc., the orbiting scroll 6 will not be pushed up because the bearing 7 has the same axial number ζ free (the thrust at the pin crank 9 mentioned above) Together with the bearing action, the gap between the fixed scroll 1 and the orbiting scroll 6 at the lap IC 6b@ portion is maintained at a predetermined value.

In addition, if you want to make it oil-free if necessary,
This can be easily implemented by making each bearing a grease-sealed type.

〔Effect of the invention〕

The present invention eliminates the need for an Oldham bin for preventing the rotation of an orbiting scroll in a scroll-type rotating machine or a specially constructed thrust bearing device. A flanged pin crank prevents the orbiting scroll from rotating and supports the thrust load.

Therefore, the gap between the ends of the wraps of each scroll can be maintained at a predetermined value using only inexpensive commercially available products with a simple configuration.

Furthermore, if it is desired to make the bearing oil-free as necessary, this can be easily achieved by making each bearing part a grease-sealed type.

Brief explanation of the previous aspects Fig. 1 is a vertical sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged detailed view of the pin crank part in Fig. 1, and Fig. 3 is a scroll type fluid machine with a conventional configuration. It is a longitudinal cross-sectional view showing an example.

In the figure, 1 is a fixed scroll, 2 is a casing, and 3
・4 is a bearing, 5 is a rotating shaft, 5a is a crankshaft, 6 is an orbiting scroll, 6a is a base plate, 9 is a flanged pin crank, 1
0 indicates a radial bearing thrust bearing.

Claims (1)

[Claims] (1) In a scroll consisting of a fixed scroll, an orbiting scroll, a rotating shaft with a crankshaft, a bearing for the rotating shaft, and a casing, the orbiting scroll is rotatably and axially movably supported on the crankshaft, and the orbiting scroll is supported on a base plate. Flammed pin cranks with the same eccentricity as the crankshaft are arranged at multiple locations between the lower surface and the casing, and the pin cranks are supported by radial bearing thrust bearings on both the orbiting scroll side and the casing side, and rotate. A scroll-type fluid machine characterized in that the thrust load of the scroll is supported by a pin crank and a casing.