JPH087041Y2 - Scroll type fluid machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a scroll type fluid machine used as a compressor, an expander or the like.

(Prior Art) An example of a conventional scroll compressor is shown in FIGS.
As shown in the figure.

As shown in FIG. 5, a scroll-type compression mechanism C is provided in the upper portion of the hermetically sealed housing 8 and an electric motor 4 is provided in the lower portion thereof.

The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, an Oldham link 3 which allows the orbiting orbiting motion of the orbiting scroll 2 but prevents its rotation, a frame 6 to which the fixed scroll 1 and the electric motor 4 are locked, and a rotation. An upper bearing 71 and a lower bearing 72 which support the shaft 5, an orbiting bearing 73 and a thrust bearing 74 which support the orbiting scroll 2.
It is equipped with

The fixed scroll 1 is composed of an end plate 11 and a spiral scroll 12, and the end plate 11 is provided with a discharge port 13 and a discharge valve 17 for opening and closing the discharge port 13.

The orbiting scroll 2 is composed of an end plate 21, a spiral body 22 and a boss 23. A drive bush 54 is fitted in the boss 23 and is pivotally supported via an orbiting bearing 73. An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is rotatably supported by the drive bush 54.

The lubricating oil 81 stored in the bottom of the housing 8 is sucked up from the inlet hole 51 by the centrifugal force generated by the rotation of the rotary shaft 5, passes through the oil supply hole 52, and the lower bearing 72, the eccentric pin 53, the upper bearing 71, the Oldham link 3, After lubricating the orbiting bearing 73 and the thrust bearing 74, the oil is discharged to the bottom of the housing 8 through the chamber 61 and the oil drain hole 62.

When the electric motor 4 is driven to rotate, this rotation causes the rotation shaft 5, the eccentric pin 53, the drive bush 54, and the slewing bearing 73.
Is transmitted to the orbiting scroll 2 through the orbiting scroll 2, and the orbiting scroll 2 revolves around its axis while being prevented from rotating by the Oldham link 3.

Then, the gas enters the housing 8 through the suction pipe 82, cools the electric motor 4, and then, from the suction passage 15 to the suction chamber.
After being passed through 16, the fixed scroll 1 and the orbiting scroll 2 are sucked into a plurality of closed spaces 24 which are limited by meshing with each other. Then, as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the space is compressed and reaches the central portion, and the discharge valve 17 is pushed up through the discharge port 13 to be discharged to the discharge cavity 14, and further, It enters into the second discharge cavity 19 through the hole 18 formed in the partition wall 31, and is discharged from there through the discharge pipe 83 to the outside. Reference numeral 84 is a balance weight attached to the drive bush 54.

The Oldham link 3 is, as shown in FIGS. 3 and 4,
A key groove 25 formed on the lower surface of the end plate 21 of the orbiting scroll 2.
A pair of swivel-side keys 3a slidably fitted therein, and a pair of fixed-side keys 3b slidably fitted in a key groove 26 formed in the upper surface of the frame 6 and these keys 3a and 3b. It consists of a ring 3c that is joined together. And the turning side key 3a
Extends on a diameter passing through the center of the ring 3c, and a pair of fixed side keys 3b extends on a diameter orthogonal to this diameter.

Then, when the rotary shaft 5 rotates, the turning side key
3a reciprocates in the key groove 25 in the arrow A direction, and the fixed side key 3b reciprocates in the key groove 26 in the arrow B direction. Thus, the orbiting scroll 2 revolves around the earth without rotating, and
The ring 3c reciprocates in the direction of arrow B.

(Problems to be Solved by the Invention) In the scroll-type fluid machine, in the gap between the swiveling side key 3a of the Oldham link 3 and the key groove 25, and the fixed side key.
Since the gap between the 3b and the key groove 26 is extremely small, it is difficult to supply sufficient lubricating oil into these gaps.As a result, these sliding surfaces are abnormally worn, and in extreme cases, the sliding surface may be There was a problem that it burned out and became inoperable.

(Means for Solving the Problems) The present invention has been proposed to solve the above problems, and its gist is to make a fixed scroll and an orbiting scroll mesh with each other, In a scroll type fluid machine that revolves around an orbit while blocking its rotation by an Oldham link, an oil groove is provided on a sliding surface of a key groove in which a key of the Oldham link is slidably fitted. Type fluid machinery.

 The inlet side of the key groove can be chamfered.

(Operation) In the present invention, when the scroll type fluid machine is operated,
When the orbiting scroll orbits, the Oldham link key reciprocates in the key groove, and at this time, the mist of lubricating oil contained in the gas around the Oldham link is urged by the key and forced into the oil groove. It is introduced and supplied from this oil groove to the sliding surface of the key groove.

If the inlet side of the key groove is chamfered, the mist of the lubricating oil is also forcibly introduced into the key groove from this chamfer.

(Embodiment) A first embodiment of the present invention is shown in FIG.

A chamfer 40 is provided on each of the inlets of the bottom surface 26a, the side surfaces 26b, and 26c that form the key groove 26 into which the fixed side key 3b of the Oldham link 3 is slidably fitted. An oil groove 41 is provided on the bottom surface 26a of the key groove 26 along the moving direction of the key 3b. Although not shown, the key groove 25 into which the turning side key 3a is slidably fitted is also configured in the same manner as the key groove 26.

In FIG. 1, the same members as those of the conventional one shown in FIGS. 3 to 5 are designated by the same reference numerals and the description thereof will be omitted.

During operation of the scroll type fluid machine, the fixed side key 3b of the Oldham link 3 reciprocates in the key groove 26, and the orbiting side key 3a reciprocates in the key groove 25 in the arrow direction. At this time, the gas around the Oldham link 3 is biased by the key 3b and sent into the oil groove 41, and at the same time, the mist of the lubricating oil contained in the gas passes through the chamfer 40 and the sliding surface of the key 3b and the key groove 26. Is supplied to.

Thus, it is possible to secure oil supply to these sliding surfaces and to cool the sliding surfaces with the gas passing through the oil groove 41, so that abnormal wear, seizure, etc. of the sliding surfaces can be prevented.

 FIG. 2 shows a second embodiment of the present invention.

In the second embodiment, the oil groove 41 of the first embodiment is used.
In place of the key groove 26, the sides 26b and 26c of the key groove 26
An oil groove 42 is provided along the moving direction of 3b over a slight distance from its inlet. Although not shown, the key groove 25 into which the key 3a is fitted is also configured similarly to the key groove 26.

In FIG. 2, the same members as those of the conventional one shown in FIGS. 3 to 5 are designated by the same reference numerals and the description thereof will be omitted.

Then, when the key 3a reciprocates in the direction of the arrow in the key groove 26, the mist of the lubricating oil floating around the Oldham link 3 is biased by the key 3b into the oil groove 42, and from here,
3b and the sliding surface of the key groove 26 are supplied.

(Effect of the Invention) In the present invention, when the key of the Oldham link reciprocates in the key groove, the mist of the lubricating oil contained in the gas around the Oldham link is urged by the key and forced into the oil groove. And is supplied to the sliding surface of the key groove from this oil groove.

As a result, abnormal wear and seizure of the sliding surface due to insufficient oil supply to the sliding surface between the key and the key groove can be prevented.

Also, if chamfering is performed on the inlet side of the key groove, the mist of lubricating oil can be introduced into the sliding surface between the key groove and the key groove by the reciprocating movement of the key. It is possible to reliably prevent seizure.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part showing a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of an essential part showing a second embodiment of the present invention. 3 to 5 show a conventional example,
3 is a perspective view of the Oldham link, FIG. 4 is a sectional view of the Oldham link, and FIG. 5 is a vertical sectional view of the scroll compressor. Oldham link …… 3, key 3b, key groove …… 26, chamfer …… 40, oil groove …… 41, 42

Claims (2)

[Scope of utility model registration request] 1. A scroll-type fluid machine in which a fixed scroll and an orbiting scroll are meshed with each other, and the orbiting scroll is revolved while preventing its rotation by an Oldham link. A scroll type fluid machine characterized in that an oil groove is provided on a sliding surface of a key groove to be fitted. 2. The scroll type fluid machine according to claim 1, wherein the inlet side of the key groove is chamfered.