JPH0419361B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to air conditioning, refrigeration compressors, air compressors,
The present invention relates to a rotation prevention mechanism for a scroll fluid device suitable for a pump expander, and particularly to a scroll fluid device that contributes to loss reduction, productivity, and reliability improvement.

In general, the structure of a scroll fluid device is shown in Fig. 1, and the main parts are a fixed scroll 1 formed with an upright spiral wrap 1b on an end plate 1a, and a fixed scroll 1 formed with an upright spiral wrap 2b on an end plate 2a. The fixed scroll 1 and the orbiting scroll 2 are meshed with each other, the fixed scroll is fixed to a frame 3, and a bearing is attached to the frame 3 as a drive mechanism. By fitting the crank pin 4a of the crankshaft 4, which is supported by It is designed to make a rotational movement against the 6 and 7 are rotors and stators of a motor that rotationally drives the crankshaft 4, and 8 is a chamber. In the case of operation as a compressor, when the crankshaft 4 is rotated by the motor and the orbiting scroll 2 is orbited as described above, the gas entering from the suction pipe 9 is compressed into the compression chamber 5a formed between the laps of both scrolls. , 5b, and is discharged from the central discharge port 14 of the fixed scroll 1, passes through the motor chamber of the chamber 8, and is discharged from the discharge pipe 10 to the outside of the machine. 32 is a balance weight attached to the crankshaft 4.

In the above configuration, the rotation prevention mechanism is for allowing the scroll to rotate while preventing the rotation of the orbiting scroll 2. In the conventional structure, as shown in FIGS. The key 13 is press-fitted in a straight line, a groove 11a is provided in the Oldham ring 11 at a position opposite to this, the key 13 is slid along this, and a similar groove is formed on the opposite side of the ring 11 at a position perpendicular to the groove. A groove 11b is provided, a protrusion is provided in the frame 3 in the radial direction at a position facing the groove, and the key 12 is press-fitted onto the protrusion and is slid into the groove 11b, whereby the Oldham ring 11 is moved into the groove 11a. , 11b, thereby allowing the orbiting scroll 2 to rotate while preventing its rotation.

In addition, as another conventional example, instead of providing a groove in the Oldham ring, a key that stands upright from the surface of the Oldham ring is provided in the Oldham ring, and a groove in which the key fits is provided in the rotating scroll or frame protrusion that is the other member. Some have a similar structure.

However, in the structure of these conventional anti-rotation mechanisms, (1) the groove and the side surface of the key make one-sided contact, increasing local surface pressure;

(2) Since the key and groove slide on a plane, friction loss is large and wear is likely to occur.

(3) Since it is a flat sliding type, a large amount of oil is required.
The temperature of the sliding parts also tends to rise.

For these reasons, it was necessary to strictly control the dimensional accuracy of the keys and grooves, increase the surface accuracy, and increase the hardness of the sliding surfaces by hardening. Because of this, productivity is poor,
Furthermore, if the conditions became even slightly severe, there were problems in terms of reliability, such as the sliding surface seizing up.

Japanese Patent Application Publication No. 55-60687 is related to these.
There are publications, etc.

The present invention has been made in view of the above points. (1) Even if the groove dimensions and surface accuracy are rough, the Oldham ring can move smoothly enough even with ordinary steel to satisfy the anti-rotation mechanism. to do.
As a result, improve productivity.

(2) Ensure that the product functions satisfactorily even when the usage conditions become harsh and the lubrication conditions become severe.

(3) Reduce friction loss by converting sliding motion to rolling motion.

The purpose is to

Conventionally, especially when the pressure inside the chamber of a scroll compressor is used as the discharge pressure, the viscosity decreases due to an increase in the dissolution rate of refrigerant in the lubricating oil, resulting in poor lubrication properties. In severe cases, seizures could occur.
Therefore, the present invention is characterized in that the sliding portion is changed to a rolling type.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 4 to 10.

In the figure, the same parts as in FIGS. 1 to 3 are denoted by the same reference numerals, and the explanation thereof is omitted.

15 is an Oldham ring whose inner periphery is formed into an elliptical shape. Grooves 15a are provided at opposing positions in the long diameter direction, and in the grooves, an outer ring of a ball bearing or a roller bearing 16, in which an inner ring 16a is press-fitted onto a pin 17 fixed to an opposing position on the lower surface of the orbiting scroll 2, is provided. 16b is rolled, and a protrusion 15b is formed in the outer circumferential direction of the Oldham ring 15 in the direction perpendicular to the groove 15a, and the protrusion 15b
A notch 15c is provided at the tip of the ring parallel to the surface of the Oldham ring 15. Another ball bearing or roller bearing 18 is mounted within this notch 15c by a pin 19, and the outer ring of the bearing 18 is rotatable.

The outer ring of the ball bearing or roller bearing 18 mounted on the protrusion 15b is inserted into the groove 3b formed by the protrusion 3a of the frame 3 and freely rolls.

In another embodiment shown in FIGS. 11 to 14,
The Oldham ring has an elliptical shape with protrusions 20b in the minor diameter direction.
By bending and joining two thin plates 20 and 21 as shown in the figure, a groove 20a is formed in the long axis direction, and a forked part is formed with a protrusion 20b in the short axis direction, and a ball bearing or roller is attached to this. A bearing 18 is mounted with a pin 19, and the bearing 18 is inserted into a groove provided on the lower surface of the orbiting scroll and rolls. On the other hand, the first
As shown in FIGS. 3 and 14, a protrusion 3c is fixed to the inside of the frame 3 by welding in correspondence with the Oldham ring, and a ball bearing or roller bearing 22 is attached to this via a pin 23. The bearing 22 is inserted into the groove 20a of the Oldham ring and rolls.

In another embodiment, one side of the circular Oldham ring is formed with a diametrical groove and the opposite side is formed with a diametrical groove perpendicular to said diametrical direction, corresponding to the back surface of the orbiting scroll 2. and frame 3
Ball bearings or roller bearings attached to the inner protrusions with pins may be inserted into the grooves and rotated.

Further, as in still another embodiment shown in FIGS. 15 to 18, a groove 2c is provided in the end plate 2a of the orbiting scroll 2, and a corresponding Oldham ring 26 is provided.
A pin 28 is press-fitted into the pin 28, a ball bearing or a roller bearing 27 is attached to the pin 28, and this is inserted into the groove 2c and rolled, and on the other hand, at a position perpendicular to this, on the opposite side of the Oldham ring 26. Attach a ball bearing or roller bearing 30 to the pin 29 press-fitted into the
It is also possible to insert this into a corresponding groove provided in the frame 3 and roll it.

As shown in each of the above embodiments, the Oldham ring smoothly reciprocates in two directions at right angles to each other while rolling in contact with the orbiting scroll 2 and the frame 3.
performs a rotating motion while being prevented from rotating,
The gas is sucked and compressed and then discharged to the discharge side.

According to the present invention, by converting the conventional sliding motion of the Oldham ring into a rolling motion, the reciprocating motion of the Oldham ring can be made smooth. It can be reduced to 1/10.

(2) The amount of lubricating oil can be greatly reduced because the heat generated at the contact area is reduced.

(3) The surface accuracy and dimensional accuracy of the groove wall surface on which the rolling bearing rolls can be made rough, improving productivity.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a scroll compressor with a conventional structure, Fig. 2 is a bottom view of the orbiting scroll as above, Fig. 3 is a top view of the Oldham ring as above, and Fig. 4 is a diagram according to an embodiment of the present invention. A vertical sectional view of the scroll compressor, FIG. 5 is a bottom view of the orbiting scroll of the same embodiment, FIG. 6 is an installation diagram of the ball bearing or roller bearing of the same embodiment, and FIGS. 7, 8, and 9. are a plan view and two side views of the Oldham mechanism of the same embodiment, and the first
Figure 0 is a top view of the frame of the same example, Figure 11,
Fig. 12 is a plan view and side view of an Oldham mechanism according to another embodiment of the present invention, Fig. 13 is a top view of a frame of the same embodiment, and Fig. 14 is an installation diagram of a ball bearing or roller bearing of the same embodiment. , FIGS. 15 and 16 are a bottom view and a side view of an orbiting scroll according to still another embodiment of the present invention, and FIGS. 17 and 18 are a top view and a side view of an Oldham ring according to the same embodiment. 1...Fixed scroll, 2...Orbiting scroll, 3
...Frame, 4...Crankshaft, 5...Compression chamber, 6...
Rotor, 7... Stator, 8... Chamber, 9... Suction pipe, 10... Discharge pipe, 11... Oldham ring, 1
2, 13...Oldham key, 14...Discharge pipe, 15,
20,21,26...Oldham ring, 16,1
8, 22, 27, 30... Ball bearing or roller bearing, 17, 19, 23, 28, 29... Pin.

Claims (1)

[Scope of Claims] 1. A fixed scroll having an end plate and a spiral wrap standing upright thereon; a frame fixing the peripheral portion of the fixed scroll end plate; a frame having an end plate and a spiral wrap standing upright thereon; an orbiting scroll disposed between the orbiting scroll end plate and the frame and meshing with the fixed scroll so as to be surrounded by the fixed scroll and the frame; an Oldham ring disposed parallel to the orbiting scroll end plate between the orbiting scroll end plate and the frame; , and the Oldham ring is movable relative to the frame only in a first radial direction, and relative to the orbiting scroll only in a second radial direction perpendicular to the first radial direction. It consists of an Oldham ring-frame engagement means and an Oldham ring-orbiting scroll end plate engagement means for engaging the ring with the frame and the orbiting scroll end plate, respectively, and prevents the orbiting scroll from rotating on its own axis while preventing the orbiting scroll from rotating relative to the fixed scroll. In a scroll fluid machine equipped with an anti-rotation mechanism that allows movement; and a drive mechanism that causes the orbiting scroll to orbit relative to the fixed scroll, the Oldham ring-frame engagement means comprises:
One of both Oldham ring and frame
a pair of grooves in the first direction provided on the person, and a first pair of pins provided on the other of the two, respectively, and are respectively pivotally connected to the pair of grooves in the first direction. a first pair of rolling wheels inserted and rolling along the groove; and the Oldham ring-orbiting scroll end plate engagement means comprises one of the Oldham ring and the orbiting scroll end plate. a pair of grooves in the second direction provided on the other of the two; respectively pivotally connected to a second pair of pins provided on the other of the two, and respectively in the pair of grooves in the second direction; A scroll fluid machine comprising: a second pair of rolling wheels inserted and rolling along the groove; 2. The first pair of pins in the Oldham ring-frame engagement means and the first pair of rollers pivotally connected thereto, or the first pair of pins in the Oldham ring-orbiting scroll end plate engagement means. The second pair of pins and the second pair of rollers pivotally connected thereto respectively pass through forks formed in a pair of arms that protrude radially from the Oldham ring to opposite sides. The scroll fluid machine according to claim 1, comprising a pair of pins and a pair of rolling wheels pivotally connected to the pins within the fork. 3. The first pair of pins in the Oldham ring-frame engagement means and the first pair of rollers pivotally connected thereto, or the first pair of pins in the Oldham ring-orbiting scroll end plate engagement means. The second pair of pins and the second pair of wheels pivotally connected thereto are a pair of pins planted on the surface of the Oldham ring and a pair of wheels pivotally connected to the pins, respectively. Scroll fluid machine according to item 1. 4. Each of the rolling wheels is an outer ring of a ball bearing or a roller bearing consisting of an inner ring, an outer ring, and a large number of balls or rollers inserted between these inner and outer rings, and the inner ring of the ball bearing or roller bearing is the outer ring of the respective roller bearing. A scroll fluid machine according to claim 1, wherein the scroll fluid machine is press-fitted onto a pin.