JPH057522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a movable scroll for a scroll-type fluid machine, which is made of an aluminum alloy and is driven to revolve relative to a fixed scroll via an Oldham ring.

(Prior art) Generally, scroll type fluid machines are
59-183091, and as shown in FIG. 8, a fixed scroll F is fixed to a frame H built into a casing K, and a movable scroll O
The rotation of the motor M is transmitted to the movable scroll O through a transmission mechanism C having a drive shaft D and an eccentric portion, and also through an Oldham ring R shown in FIG. , the movable scroll O is driven to revolve relative to the fixed scroll F.

The Oldham ring R is provided with two sets of key means X,
to the frame H in a straight line, and slide it in a straight line perpendicular to the sliding direction by the key means X, X to the movable scroll O through the key means Y, Y on the other side. The frame H is formed with a guide for guiding the sliding of the key means X, and the movable scroll O is formed with a guide for guiding the sliding of the key means Y, Y. It will be done.

(Problems to be Solved by the Invention) Currently, attempts are being made to increase the rotation speed of the scroll type fluid machine by using an inverter. In order to increase the rotation speed, the key means X, X, Y, Y
Among the loads acting on the sliding portions of the bearings, the component based on the inertia force increases in proportion to the square of the rotational speed, so it is desirable to reduce the weight of the Oldham ring R.

Therefore, in order to reduce the weight of this Oldham ring R, it is preferable that the material itself be made of lightweight aluminum alloy, but on the other hand, the movable scroll O that has a guide that slides on this Oldham ring R is Similarly, it is usually made of aluminum alloy to reduce weight.
Metals of the same type would slide against each other, and a seizure phenomenon would occur at the sliding portions.

Therefore, the present applicant previously filed Utility Application No. 1981-281569 (November 25, 1986), and as shown in Figure 10, attempted to make Oldham's ring from an aluminum alloy, and also made it from an aluminum alloy. We have proposed a movable scroll 3 in which channels 12, 12 made of iron-based material and having guide grooves 12a open at the bottom are attached to the guide groove forming portions.

According to this, it is possible to reduce the weight of the Oldham ring while avoiding sliding between similar metals and preventing seizure.As shown in FIG.
Since channel 12f is formed straight, during solution treatment after casting of movable scroll 3 (generally left in wax at about 500°C for 10 hours and then quenched by soaking in water), channel 1
There is a risk that the channels 2 and 12 may fall off from the movable scroll 3.
There was a possibility that numbers 2 and 12 would fall off.

The present invention was invented to solve the conventional problems caused by sliding between metals of the same type, and to improve the previous proposal, in which the key of the Oldham ring is slidably engaged. In the region where the guide groove is formed, a channel made of iron-based material and having a guide groove that opens downward, and whose outer surface is in a reverse tapered shape and slopes toward the guide groove side toward the open side of the guide groove, is buried. Accordingly, the sliding characteristics between the key of the Oldham ring and the guide groove can be improved,
The main object of this invention is to provide a movable scroll for a scroll-type fluid machine in which the channel is reliably held in a state where it is not removed.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a movable scroll-type fluid machine which is made of an aluminum alloy and is driven to revolve around a fixed scroll 2 via an Oldham ring 11. In the scroll, a channel 12 made of an iron-based material and having a guide groove 12a opening downward is embedded in a region where a guide groove is formed to slidably engage the key 11b of the Oldham ring 11. The outer surfaces 12b, 12b of the channel 12 have a reverse tapered shape that is inclined toward the guide groove 12a toward the open side of the guide groove 12a.

(Function) Therefore, the key 11 of the Oldham ring 11
The outer surface 1 of the channel 12 is made of a ferrous material and has a guide groove 12a that opens downward and is embedded in the formation area of the guide groove that freely slides and engages the
2b, 12b are formed into a reverse tapered shape that is inclined toward the guide groove 12a side toward the open side of the guide groove 12a, so that the channel 12 is reliably held in a non-removal state, and the guide groove 12a
Since the channel 12 with the groove 12 is made of iron-based material, the sliding characteristics between the guide groove 12a and the key 11b of the Oldham ring 11 are improved, and seizure does not occur, and the Oldham ring 11 Since it can be made from aluminum alloy, it can be made lighter.

(Embodiments) A movable scroll for a scroll type fluid machine according to the present invention will be explained below with reference to embodiments shown in the drawings.

What is shown in FIG. 3 is a scroll-type fluid machine equipped with a movable scroll according to the present invention.
This scroll type fluid machine has a sealed casing 1
The fixed scroll 2 is placed at the inner upper position of the frame 4.
At the same time, a movable scroll 3 is supported via an annular thrust bearing seat 40 and a thrust plate 41 attached to the frame 4, and is located at a lower position of the casing 1. A motor M is disposed, and a drive shaft 5 extending vertically is rotatably supported on the frame 4 via a bearing 6, and a lower part of the drive shaft 5 is connected to the motor M. A counterweight 7 is integrally protruded from a protruding portion that protrudes upward from the bearing 6, and between the counterweight 7 and the movable scroll 3, the movable scroll 3 is rotated as the drive shaft 5 rotates. A transmission mechanism 8 is interposed to drive the fixed scroll 2 to revolve.

The transmission mechanism 8 includes a drive pin 10a and a limit pin 1 protruding from the counterweight 7.
0b and an Oldham ring 11 constituting an anti-rotation mechanism, the radial bearing 9 is installed at a position eccentric to the axis of the drive shaft 5 of the swing link 9.
The boss portion 3a of the movable scroll 3 is supported by a bearing via the movable scroll 3, while the Oldham ring 11 prevents the movable scroll 3 from rotating, as will be described in detail below, so that the movable scroll 3 is attached to the fixed scroll. 2, only the revolution drive is performed.

That is, as is clear from FIG. 2, the Oldham ring 11 is attached to the boss portion 3a of the movable scroll 3.
A pair of first keys 11b, 11b is removed in an upward horizontal direction from opposing points on the circumference of the ring body 11a. A pair of second keys 11c, 11c are provided horizontally outward at positions extending in the direction and perpendicular to the first keys 11b, 11b, and each of the first keys 11b,
11b is formed at a position facing the lower surface of the movable scroll 3, and each guide groove 12a, 12a, which will be described later, has
Further, the second keys 11c, 11c are slidably inserted into the respective guide grooves 4d, 4d formed in the thrust bearing seat 40 attached to the frame 4, and thus the drive shaft 5 During rotational driving, the first and second keys 11b, 11b, 11c, 11c of the Oldham ring 11 are orthogonal to each other in the guide grooves 12a, 12a, 4d, 4d formed on the movable scroll 3 side and the frame 4 side, respectively. By sliding in only two directions, rotation of the movable scroll 3 is prevented, and the movable scroll 3 is caused to revolve relative to the fixed scroll 2.

In this embodiment, since the inner diameter of the annular thrust plate 41 that receives the lower surface of the movable scroll 3 is smaller than the outer dimension of the swing link 9 constituting the transmission mechanism 8, the thrust bearing seat 40 is A guide groove 4d is interposed therebetween.
4d, but it goes without saying that the guide grooves 4d, 4d may be formed directly on the frame 4 without intervening the thrust bearing seat 40.

Therefore, in the present invention, in the scroll type fluid machine having the above structure, the movable scroll is formed of an aluminum alloy, and the movable scroll is constructed as follows.

That is, as clearly shown in FIGS. 1 and 2, guide grooves 12a, 12a that open downward are formed in the forming portions of the guide grooves that slidably engage the first keys 11b, 11b of the Oldham ring 11. Channels 12, 12 made of a ferrous material such as iron or cast iron are embedded by casting, and outer surfaces 12b, 12b of the channels 12, 12 are buried.
has a reverse tapered shape that is inclined toward the guide groove 12a toward the open side of the guide groove 12a.

Further, as shown in FIGS. 4 to 7, when embedding the channels 12, 12 by casting,
The outer peripheral edges 12t of the channels 12, 12 are hidden by the aluminum alloy of the outer peripheral edge 3t of the movable scroll 3. That is, the outer peripheral ends of the channels 12, 12 are connected to the movable scroll 3.
The grooves are cast inwardly from the outer peripheral edge 3t, and near the outer peripheral edge 3t are continuous with the guide grooves 12a, 12a extending along the length direction of the channels 12, 12, The guide groove continuous portions 3a, 3a are formed only in the aluminum alloy portion of the movable scroll 3.

As described above, since the outer surfaces 12b, 12b of the channels 12, 12 are in a reverse tapered shape that is inclined toward the guide groove 12a side toward the open side of the guide groove 12a, the channels 12, 12
Since the channels 12, 12 having the guide groove 12a are made of iron-based material, the guide groove 12a
The sliding characteristics between the Oldham ring 11 and the first key 11b are improved so that seizure does not occur, and since the Oldham ring 11 can be made of aluminum alloy, it can be made lighter.

In addition, in this embodiment, the channel 1
The outer peripheral end 12t of 2 and 12 is the movable scroll 3.
Since the iron-based material is buried by casting so as to be hidden by the aluminum alloy on the outer circumferential edge 3t of the movable scroll 3, the ferrous material does not come out on the outer circumferential edge 3t of the movable scroll 3, and the finishing process of the outer circumferential edge of the movable scroll 3 is easy. In addition to being easy to perform and improving workability, the channel 1
There is an advantage that displacement in the sliding direction of parts 2 and 12 can be reliably prevented.

(Effects of the Invention) As described above, the present invention provides a movable scroll for a scroll-type fluid machine which is made of an aluminum alloy and is driven to revolve around a fixed scroll 2 via an Oldham ring 11, which comprises: A channel 12 made of an iron-based material and having a guide groove 12a that opens downward is embedded in a region where a guide groove is formed to slidably engage the keys 11b of 11, and the channel 12 is
The outer surfaces 12b, 12b of the guide groove 12a
Since the channel 12 has a reverse tapered shape that is inclined toward the guide groove 12a side toward the open side of the guide groove 12a, the channel 12 can be reliably held in a state where it does not come off. Since it is made of iron-based material, the guide groove 12a and the key 1 of the Oldham ring 11 are
The sliding characteristics with the Oldham ring 1b are improved and the problem of seizure can be eliminated, and the Oldham ring 1
1 can be made of aluminum alloy, and the weight of the Oldham ring 11 can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the main parts of the movable scroll of a scroll-type fluid machine according to the present invention, FIG. 2 is an exploded perspective view showing the mounting part of the Oldham ring, and FIG.
The figure is a cross-sectional view of the main parts showing the structure of a scroll-type fluid machine equipped with a movable scroll according to the present invention, FIG. 4 is a plan view of the movable scroll, FIG. 5 is a longitudinal cross-sectional view thereof, and FIG. 5 is a cross-sectional view of the main part taken along the - line in FIG. 5, FIG. 7 is a side view of the main part taken along the - line in FIG. 5, FIGS. 8 and 9 are views showing the prior art, and FIG. 1 is a sectional view of a main part of a movable scroll showing a prior art previously filed by the present applicant. 2...Fixed scroll, 3...Movable scroll, 1
DESCRIPTION OF SYMBOLS 1...Oldham ring, 11b...key, 12...channel, 12a...guide groove, 12b...outer surface.

Claims (1)

[Claims] 1 A movable scroll of a scroll type fluid machine made of aluminum alloy and driven to revolve around a fixed scroll 2 via an Oldham ring 11, in which the key 1 of the Oldham ring 11 is
A channel 12 made of an iron-based material and having a guide groove 12a that opens downward is buried in the region where the guide groove is formed to freely slidably engage the channel 1b, and the outer surfaces 12b, 12b of the channel 12 are embedded.
A movable scroll for a scroll-type fluid machine, characterized in that the movable scroll has a reverse tapered shape that is inclined toward the guide groove 12a toward the open side of the guide groove 12a.