JPS6249441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scroll-type fluid machine comprising a fixed scroll and an orbiting scroll attached to a crankshaft so as to revolve without rotating on its axis.

As shown in Fig. 1, the conventional fluid machine of this type is
A fixed scroll 2 that is fixed to the main body 1 and has a lap portion 2A, and an orbiting scroll that is attached to the crankshaft 5 so as to revolve without rotating through a sliding bearing 6 and an Oldham ring 7 and has a lap portion 3A. 3, and both wrap portions 2A and 3A are provided to face each other.

The Oldham ring 7 is connected to the main body 1 via the key 8.
The crankshaft 5 is fixed to the main shaft 4 supported by a bearing 11 and inserted into a groove (not shown) provided on the back surface of the orbiting scroll 3 . 9 is the crankshaft 5
10 is a seal ring installed between the main body 1 and the back surface of the orbiting scroll 3; 12 and 13 are balance weights installed on the thrust bearing 9 side and the anti-thrust bearing side of the main shaft 4, respectively. and a counterweight.

As mentioned above, both scrolls 2 and 3 are provided so that their wrap portions 2A and 3A face each other, so that the rotation of the crankshaft 5 causes the orbiting scroll 3 to revolve without rotating with a certain eccentric radius. By doing so, it performs an action that gives work to the fluid or obtains work from the fluid. However, in the above-mentioned structure, when the orbiting scroll 3 has not yet reached a steady state immediately after operation, the orbiting scroll 3 is pressed against the fixed scroll 2, so that the laps of both 2 and 3 and the tips and bottoms of the teeth come into contact with each other. Abnormal wear occurs on the tip end of the lap, and in severe cases, there is a risk that the tip end of the tooth may become deformed or damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll fluid machine that can prevent abnormal wear on the tip sides of both lap teeth of an orbiting scroll and a fixed scroll.

A feature of the present invention is that the boss portion of the orbiting scroll is formed to protrude from the end plate in the height direction of the lap teeth, and a thrust bearing is disposed between the protruding end surface of the boss portion and the tooth bottom of the fixed scroll. It is something that exists.

With the above configuration, when the orbiting scroll is pressed toward the fixed scroll, this force is supported by the thrust bearing, and the tip side of the lap tooth and the bottom of the opposing scroll can maintain a non-contact state. , it is possible to prevent abnormal wear on the tip side of the lap teeth.

An embodiment of the present invention will be described below with reference to the drawings. Among the symbols shown in FIG. 2, the same symbols as those shown in FIG. 1 indicate the same parts.

In Fig. 2, 3 indicates a wrap portion 3A and a boss portion 3.
14 is a reverse thrust bearing provided between the protruding end surface (the left end in the figure) of the boss portion 3B of the orbiting scroll 3 and the fixed scroll 2. The boss portion 3B includes the orbiting scroll 3
It is formed to protrude from the end plate in the height direction of the wrap 3A. The rest of the structure is the same as the conventional example shown in FIG. 1, so the explanation will be omitted.

Since this embodiment is configured as described above, during steady operation, the orbiting scroll 3 is pressed against the main body 1 side by the pressure of the working fluid itself and generates a thrust force, but this thrust force is supported by the thrust bearing 9. . On the other hand, during unsteady operation or in a transient state of operation, for example, when starting and stopping operation, the orbiting scroll 3 is pressed toward the fixed scroll 2 and generates a reverse thrust force.
However, this reverse thrust force is caused by the reverse thrust bearing 14.
Since the wraps 2A and 3A of both scrolls 2 and 3 are supported by the scrolls 2 and 3, there is no possibility that the laps 2A and 3A of both scrolls 2 and 3 will come into contact with each other.

As explained above, according to the present invention, even if the orbiting scroll is pressed toward the fixed scroll during unsteady operation or in a transient state of operation, the wrap portions of both scrolls are prevented from coming into contact with each other. , it is possible to prevent abnormal wear on the tip end side of the wrap, and also prevent accidents of breakage of the wrap.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional scroll-type fluid machine, and FIG. 2 is a cross-sectional view showing an embodiment of the scroll-type fluid machine of the present invention. 2...Fixed scroll, 3...Orbiting scroll, 3
B...Boss part, 14...Reverse thrust bearing.

Claims (1)

[Claims] 1. A fixed scroll with a spiral wrap and an orbiting scroll with a spiral wrap standing upright on an end plate are engaged with each other at the laps, and the boss of the orbiting scroll engages with the crankshaft. In a scroll type fluid machine in which the orbiting scroll revolves around the fixed scroll without rotating, the boss part is formed to protrude from the end plate in the height direction of the wrap, and the protruding end surface of the boss part and the fixed scroll are connected to each other. A scroll-type fluid machine characterized by having a thrust bearing disposed between the tooth bottom and the tooth bottom.