JP2780580B2 - Swing type rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating rotary compressor used for an air conditioner or a refrigerator for cooling and heating.

[0002]

2. Description of the Related Art Conventionally, as a swing type rotary compressor,
As shown in FIG. 4, a housing 1 having a cylindrical cylinder chamber 1a and a hole 12 having a cylindrical cross section opened to the cylinder chamber 1a, and a plate-shaped member disposed in the cylinder chamber 1a and extending in the radial direction. And an eccentric disk 3a eccentrically fixed to the rotating shaft 3 and rotatably fitted to the inner periphery of the roller 2. Oscillating bushes 4 and 5 having a semicircular cross section are arranged in the cylindrical hole 12, and the flat portions of the sliding bushes 4 and 5 correspond to the blade 2 a of the roller 2.
Are made to slide on both sides. The housing 1 on the right side of the hole 12 is provided with a suction port 1b opening to the cylinder chamber 1a. Housing 1 on left side of hole 12
Is provided with a discharge port 1c opening to the cylinder chamber 1a.

FIG. 5 is a sectional view of the oscillating rotary compressor cut along the line BB of FIG.
Both ends of the eccentric disk 3a are sandwiched between the housings 6 and 7, and are slidably in contact with the housings 6 and 7. Further, circumferential grooves 3b and 3c are provided at both axial ends of the eccentric disk 3a.

[0004]

In the conventional oscillating rotary compressor, when the roller 2 is in the compression stroke due to the rotation of the eccentric disk 3a, the roller 2 is turned off.
The outer peripheral surface on the compression chamber 11 side receives a high pressure of the compressed refrigerant gas. Therefore, the roller 2 on the compression chamber 11 side
Is pressed against the outer peripheral surface of the eccentric disk 3a,
The contact pressure between the inner peripheral surface of the roller 2 on the suction chamber 10 side and the eccentric disk 3a is reduced, or a gap is formed between them. Therefore, the width of the inner peripheral surface of the roller 2 on the suction chamber 10 side and the width of the eccentric disk should be smaller than those on the compression chamber 11 side from the viewpoint of surface pressure resistance.

However, in the above-described conventional oscillating rotary compressor, since the width of the inner peripheral surface of the roller 2 and the width of the outer peripheral surface of the eccentric disk 3a are the same over the entire circumference, the roller 2 and the eccentric circular There is a disadvantage that the contact area of the plate 3a becomes unnecessarily large and power loss due to sliding resistance and viscous resistance of lubricating oil is large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an oscillating rotary compressor that can withstand the pressure of a refrigerant gas and reduce power loss by reducing sliding resistance and viscous resistance. .

[0007]

In order to achieve the above object, a rotary compressor according to the present invention comprises a housing having a cylinder chamber and a hole opened in the cylinder chamber, a roller disposed in the cylinder chamber, An eccentric disk fixed eccentrically to a shaft and rotatably fitted to the inner periphery of the roller, connected to the roller, and fitted to the hole so as to be able to protrude and retract so that the suction chamber in the cylinder chamber In the oscillating rotary compressor having a blade partitioned into a compression chamber and a compression chamber, a groove is provided on the suction chamber side of the inner peripheral surface of the roller, and the roller compresses the refrigerant gas to a predetermined pressure or more. A groove is provided in the direction in which the resultant force of the pressure of the refrigerant gas acting on the roller acts during the stroke and on the outer peripheral surface of the eccentric disk on the suction chamber side.

[0008]

According to the oscillating rotary compressor having the above construction, the roller is oscillating about the blade supported by the hole while moving in the entire radial direction in the cylinder chamber. The groove provided on the suction chamber side of the inner peripheral surface of the roller is always on the suction chamber side and does not change. On the other hand, the inner peripheral surface of the roller on the compression chamber side is pressed against the eccentric disk, but since there is no groove on the inner peripheral surface of the roller on the compression chamber side, the pressure receiving area is large and the surface pressure does not become excessive. Absent. Further, since the inner peripheral surface of the roller on the suction chamber side is not pressed against the eccentric disk, the surface pressure of the inner peripheral surface of the roller does not become excessive even with the groove, and the sliding area is small. Therefore, the sliding resistance is reduced. Further, since the thickness of the lubricating oil layer is increased due to the grooves, the viscous resistance is also reduced. With the rotation of the eccentric disk, the groove provided on the outer peripheral surface of the eccentric disk rotates and faces in all directions, but the groove of the eccentric disk compresses the refrigerant gas in the compression chamber when the roller exceeds a predetermined pressure. Is in the direction in which the resultant of the pressure of the refrigerant gas acts and on the suction chamber side. Therefore, even if the pressure of the refrigerant gas in the compression chamber becomes equal to or higher than the predetermined pressure and the roller is strongly pressed against the eccentric disk, there is no groove on the outer circumference of the eccentric disk on the compression chamber side where the roller is pressed, and Since there is no groove on the inner peripheral surface of the roller on the compression chamber side, the contact area between the eccentric disk and the roller that presses against each other on the compression chamber side is increased, and their surface pressure is reduced, causing seizure, etc. No damage will occur. On the other hand, at this time, since the groove is formed on the inner peripheral surface of the eccentric disk on the suction chamber side, the groove overlaps with the groove on the inner peripheral surface of the roller on the suction chamber side, and the roller and the eccentric disk are formed on the suction chamber side. The area of the parts sliding on each other is reduced, and the sliding resistance is reduced. When the groove on the inner peripheral surface of the roller and the groove on the outer peripheral surface of the eccentric disk face each other, the distance between the bottoms of both grooves increases, so the thickness of the lubricating oil layer increases and the viscous resistance decreases. . Further, when the groove on the inner circumference of the roller and the groove on the eccentric disk do not face each other, the area of the parts sliding on each other is extremely small, and the sliding resistance is reduced.

On the other hand, when the refrigerant gas is not compressed to the predetermined pressure or more, for example, the groove on the outer peripheral surface of the eccentric disk is located on the compression chamber side, but at this time, the pressure of the refrigerant gas is extremely small. Therefore, the surface pressure of the outer peripheral surface of the eccentric disk on the compression chamber side does not become excessive. That is, since the resultant force of the pressure of the compressed refrigerant gas is received on the outer peripheral surface of the eccentric disk without the groove, seizure or the like can be prevented, and the outer peripheral surface of the eccentric disk with the groove is at a position where no force is applied from the roller. Therefore, sliding resistance and viscous resistance can be reduced, and power loss can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an oscillating rotary compressor according to the present invention will be described in detail with reference to embodiments.

FIG. 1 is a sectional view of an oscillating rotary compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 is a cylinder chamber 1a and this cylinder chamber 1a
A housing 2 having a cylindrical hole 12 having a cylindrical cross section that opens into the inside, has a plate-like blade 2a extending in the radial direction,
A cylindrical roller disposed in the cylinder chamber 1a,
Reference numeral 3 denotes a rotating shaft on which an eccentric disk 3a rotatably fitted to the inner periphery of the roller 2 is fixed. Reference numerals 4 and 5 are disposed in the hole 12 and flat portions are formed on both sides of the blade 2a of the roller 2. The swing bush has a semicircular cross section that slides on the surface. The swing bushes 4 and 5 rotate within a predetermined angle range in accordance with the movement of the blade 2a in the hole 12, and
The blade 2a is supported so that it can come and go. Therefore, the roller 2 swings around the swinging bushes 4 and 5, ie, the blade 2a, and slides on the inner periphery of the cylinder chamber 1a and moves in all radial directions. The housing 1 on the right side of the hole 12 is provided with a suction port 1b opening to the cylinder chamber 1a, and the housing 1 on the left side of the hole 12 is provided with a discharge port 1c opening in the cylinder chamber 1a.

As shown in FIG. 2, both end surfaces of the roller 2 and the eccentric disk 3a are sandwiched between housings 6 and 7, and slidably contact the housings 6 and 7. Also, circumferential grooves 3b, 3c are provided at both ends of the eccentric disk 3a in the axial direction.
Is provided. As shown in FIGS. 1 and 2, when the lowermost point of the outer periphery of the roller 2 is located at the lowermost point in FIG. 1 of the inner periphery of the housing 1, that is, the blade 2 a projects most from the hole 5, When the suction chamber 10 on the right side of 2a and the compression chamber 11 on the left side of the blade 2a are formed,
Circumferential grooves 21 and 22 are provided in substantially the right half area of the inner peripheral surface of the roller 2 and at both ends in the axial direction. Further, circumferential grooves 23 and 24 are provided in the outer circumferential surface of the eccentric disk 3a in substantially the right half area in FIG. 1 and at both ends in the axial direction, and these grooves 23 and 24 and the grooves 21 and 22 of the roller are mutually They face each other. Therefore, the grooves 21 of the roller 2,
22, the inner peripheral surface 2b and the groove 23 of the eccentric disk 3a,
The outer peripheral surface 3b sandwiched between the two opposes each other.

One end of the rotating shaft 3 is connected to a motor (not shown), and the rotating shaft 3 is moved in the direction of arrow R in FIG.
To rotate the eccentric disk 3a fixed to the rotation shaft 3.
Is rotated eccentrically inside the roller 2 so that the roller 2 swings while being in contact with the inner peripheral surface of the cylinder chamber 1a.

The roller 2 operates as follows according to the rotation of the rotating shaft 3, ie, the eccentric disk 3a.

As shown in FIG. 3A, the upper end surface of the blade 2a of the roller 2 is most immersed in the hole 12, and the space between the housing 1 and the roller 2 is filled with the refrigerant gas. And At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are on the right half, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. The surface pressure does not become excessive and the sliding area is small, so that the sliding resistance is small. Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscosity resistance is also reduced. Further, the groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) are located on the left half and the refrigerant gas is not compressed to a predetermined pressure or more, so that the resultant force of the pressure of the refrigerant gas is extremely small. The surface pressure of the outer peripheral surface 3b of the plate 3a does not become excessive, and the sliding area is small, so that the sliding resistance is small. Further, the thickness of the lubricating oil layer is increased by the grooves 22 and the grooves 24 (not shown), so that the viscous resistance is also reduced.

As shown in FIG. 3 (b), when the rotation shaft 3 is rotated by 60 degrees in the direction of arrow R from FIG. 3 (a), the roller 2 moves to the upper right of the inner circumference of the housing 1. . In accordance with the movement of the roller 2, the blade 2a
Of the upper end of the hole 12 is lower than the position shown in FIG. At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are located on the suction chamber 10 side, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. Since the surface pressure of the surface 2b does not become excessive and the sliding area is small, the sliding resistance is reduced. Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscosity resistance is also reduced. The groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) are rotated by 60 degrees in the direction of arrow R from the position shown in FIG. At this time, since the refrigerant gas is not compressed to a predetermined pressure or more, the resultant force Fb of the pressure of the refrigerant gas is extremely small, and the surface pressure of the outer peripheral surface 3b of the eccentric disk 3a does not become excessive, and the sliding area does not increase. Is small, the sliding resistance is small. Further, the thickness of the lubricating oil layer is increased by the grooves 22 and the grooves 24 (not shown), so that the viscous resistance is also reduced. A groove 21 on the inner peripheral surface of the roller 2 and a groove 22 (not shown)
And a groove 23 on the outer peripheral surface of the eccentric disk 3a and a groove 24 (not shown).
Are opposed to each other on the suction chamber 10 side within a range of approximately 50 degrees,
Since the distance between the bottoms of the grooves 21 and 23 and the distance between the bottoms of the grooves 22 and 24 are increased, the thickness of the lubricating oil layer is increased and the viscous resistance is further reduced. The grooves 23 and 24 are not provided on the outer peripheral surface of the eccentric disk 3a on the compression chamber 11 side where the roller 2 is pressed by the resultant force Fb of the gas pressure, and the grooves are also provided on the inner peripheral surface of the roller 2 on the compression chamber 11 side. Since there is no roller 21 or 22, the contact area between the eccentric disk 3a and the roller 2 on the compression chamber 11 side where they are pressed against each other is increased, and their surface pressure is reduced. While the refrigerant gas is sucked into the suction chamber 10 from the suction port 1b, the space between the housing 1 and the roller 2 in FIG.
It becomes 1 and compresses the refrigerant gas.

As shown in FIG. 3 (c), when the rotation shaft 3 rotates 120 degrees in the direction of arrow R from FIG. 3 (a), the roller 2 moves diagonally right below the inner circumference of the housing 1. I do. In accordance with the movement of the roller 2, the blade 2a
Of the upper end of the hole 12 is lower than the position shown in FIG. At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are located on the suction chamber 10 side, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. Since the surface pressure of the surface 2b does not become excessive and the sliding area is small, the sliding resistance is reduced. Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscous resistance is small. The groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) rotate 120 degrees in the direction of arrow R from the position on the compression chamber 11 side with the rotation of the rotating shaft 3. Since the outer peripheral surface 3b of the eccentric disk 3a is not pressed against the roller 2, the outer peripheral surface 3b of the eccentric disk 3a
The surface pressure does not become excessive and the sliding area is small, so that the sliding resistance is small. Further, the thickness of the lubricating oil layer is increased by the grooves 22 and the grooves 24 (not shown), so that the viscous resistance is also reduced. The groove 21 on the inner peripheral surface of the roller 2
And a groove 22, not shown, and a groove 23 on the outer peripheral surface of the eccentric disk 3a.
And the not-shown groove 24 are opposed to each other within a range of approximately 110 degrees, and the distance between the bottoms of the grooves 21 and 23 and the distance between the bottoms of the grooves 22 and 24 are increased. And the viscous drag is further reduced. At this time, since the refrigerant gas has not been compressed to a predetermined pressure or more, the resultant force of the refrigerant gas pressure is as small as Fc, and the compression chamber 11 side of the outer peripheral surface of the roller 2 receives the resultant force Fc of the gas pressure. The compression chamber 1 against which the roller 2 is pressed by the resultant Fc of the gas pressure.
There are no grooves 23, 24 on the outer peripheral surface of the eccentric disk 3a on one side,
Grooves 21 and 22 are also provided on the inner peripheral surface of the roller 2 on the compression chamber 11 side.
Therefore, the contact area between the eccentric disk 3a and the roller 2 on the compression chamber 11 side where the eccentric disk 3a and the roller 2 press against each other is increased, and their surface pressure is reduced. While the refrigerant gas is sucked into the suction chamber 10 from the suction port 1b, the space between the housing 1 and the roller 2 in FIG.
1 and the volume gradually decreases, and the compression chamber 11 compresses the refrigerant gas.

As shown in FIG. 3D, when the rotation shaft 3 rotates 180 degrees in the direction of arrow R from FIG. 3A, the roller 2 moves to the lowest point on the inner circumference of the housing 1. .
In accordance with the movement of the roller 2, the upper end surface of the blade 2a is further lowered in the hole 12 from the position shown in FIG.
It is located at the lowest point. At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are located on the suction chamber 10 side, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. Since the surface pressure of the surface 2b does not become excessive and the sliding area is small, the sliding resistance is reduced.
Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscous resistance is small. The groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) are located on the suction chamber 10 side, and the outer peripheral surface 3b of the eccentric disk 3a is not pressed against the roller 2, so that the outer peripheral surface of the eccentric disk 3a The surface pressure of the surface 3b does not become excessive, and the sliding area is small, so that the sliding resistance is small. Further, since the thickness of the lubricating oil layer is increased due to the groove 23 and the groove 24 (not shown), the viscous resistance is small. The groove 21 on the inner peripheral surface of the roller 2
And a groove 22, not shown, and a groove 23 on the outer peripheral surface of the eccentric disk 3a.
And the groove 24 (not shown) are opposed to each other on the suction chamber 10 side, and the distance between the bottoms of the grooves 21 and 23 and the distance between the bottoms of the grooves 22 and 24 are increased. And the viscous drag decreases. At this time, since the refrigerant gas has been compressed to a predetermined pressure or more, the resultant force of the refrigerant gas pressure becomes large as Fd, and the compression chamber 1 on the outer peripheral surface of the roller 2 is compressed.
One side receives a resultant force Fd of gas pressure. The grooves 23 and 24 are not formed on the outer peripheral surface of the eccentric disk 3a on the compression chamber 11 side where the roller 2 is pressed by the resultant force Fd of the gas pressure, and the grooves 21 and 24 are also formed on the inner peripheral surface of the roller 2 on the compression chamber 11 side. Since there is no 22, the contact area between the eccentric disk 3 a and the roller 2 on the compression chamber 11 side where they are pressed against each other is increased, and their surface pressure is reduced. The volume of the suction chamber 10 is shown in FIG.
(C), the refrigerant gas sucked from the suction port 1b increases, while the volume of the compression chamber 11 increases as shown in FIG.
In (a), the volume of the space between the housing 1 and the roller 2 is reduced to half, and the compression chamber 11 compresses the refrigerant gas.

As shown in FIG. 3 (e), when the rotation shaft 3 rotates 240 degrees in the direction of arrow R from FIG. 3 (a), the roller 2 moves diagonally to the lower left of the inner circumference of the housing 1. I do. In accordance with the movement of the roller 2, the blade 2a
The upper end surface rises from the position shown in FIG. At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are located on the suction chamber 10 side, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. Since the surface pressure of the surface 2b does not become excessive and the sliding area is small, the sliding resistance is reduced. Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscous resistance is small. The groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) rotate 240 degrees in the direction of arrow R from the position shown in FIG. Since the outer peripheral surface 3b of the eccentric disk 3a is not pressed against the roller 2, the surface pressure of the outer peripheral surface 3b of the eccentric disk 3a does not become excessive, and the sliding area is small, so that the sliding resistance is reduced. . Further, the thickness of the lubricating oil layer is increased by the grooves 22 and the grooves 24 (not shown), so that the viscous resistance is also reduced. The groove 21 on the inner peripheral surface of the roller 2, the groove 22 not shown, and the groove 23 on the outer peripheral surface of the eccentric disk 3 a and the groove 24 not shown oppose each other within a range of approximately 120 degrees.
Since the distance between the bottoms 1 and 23 and the distance between the bottoms of the grooves 22 and 24 increase, the thickness of the lubricating oil layer increases and the viscous resistance further decreases. At this time, since the refrigerant gas has been compressed to a predetermined pressure or more, the resultant force of the refrigerant gas pressure becomes large with Fe. There is no groove 23, 24 on the outer peripheral surface of the eccentric disk 3a on the compression chamber 11 side where the roller 2 is pressed by the resultant force Fe of the gas pressure, and the roller compression chamber 11
Eccentric disk 3a because there are no grooves 21 and 22 on the inner peripheral surface on the side.
The area of contact between the roller and the roller 2 on the side of the compression chamber 11 pressed against each other is increased to reduce the surface pressure thereof. The capacity of the suction chamber 10 becomes larger than that of FIG. 3D, and the refrigerant gas sucked from the suction port 1b increases, while the capacity of the compression chamber 11 becomes smaller than that of FIG. Compress refrigerant gas. And
A valve (not shown) opens to discharge the compressed refrigerant gas from the discharge port 1c.

As shown in FIG. 3 (f), when the rotation shaft 3 rotates 300 degrees in the direction of arrow R from FIG. 3 (a), the roller 2 moves to the upper left of the inner circumference of the housing 1. . In accordance with the movement of the roller 2, the blade 2a
The upper end surface rises from the position shown in FIG. At this time, the groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) are located on the suction chamber 10 side, and the inner peripheral surface 2b of the roller 2 is not pressed against the eccentric disk 3a. Since the surface pressure of the surface 2b does not become excessive and the sliding area is small, the sliding resistance is reduced. Further, since the thickness of the lubricating oil layer is increased due to the groove 21 and the groove 22 (not shown), the viscous resistance is small. The groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) are rotated by 300 degrees in the direction of arrow R from the position shown in FIG. Since the outer peripheral surface 3b of the eccentric disk 3a is not pressed against the roller 2, the surface pressure of the outer peripheral surface 3b of the eccentric disk 3a does not become excessive, and the sliding area is small, so that the sliding resistance is reduced. . Further, the thickness of the lubricating oil layer is increased by the grooves 22 and the grooves 24 (not shown), so that the viscous resistance is also reduced. The groove 21 on the inner peripheral surface of the roller 2 and the groove 22 (not shown) and the groove 23 on the outer peripheral surface of the eccentric disk 3a and the groove 24 (not shown) are opposed to each other within a range of approximately 60 degrees. And the distance between the bottoms of the grooves 22 and 24 are increased, so that the thickness of the lubricating oil layer is increased and the viscous resistance is further reduced. At this time, since the refrigerant gas is compressed to a predetermined pressure or more, the resultant of the pressure of the refrigerant gas becomes large as Ff. There is no groove 23, 24 on the outer peripheral surface of the eccentric disk 3a on the compression chamber 11 side where the roller 2 is pressed by the resultant force Ff of the gas pressure, and the roller compression chamber 1
Since there are no grooves 21 and 22 on the inner peripheral surface on the first side, the eccentric disk 3
The contact area between the roller a and the roller 2 on the compression chamber 11 side where they are pressed against each other is increased to reduce their surface pressure. The volume of the suction chamber 10 is larger than that of FIG. 3 (e), and the refrigerant gas sucked from the suction port 1b is increased, while the volume of the compression chamber 11 is smaller than that of FIG. 3 (e). Compress refrigerant gas. And
A valve (not shown) opens to discharge the compressed refrigerant gas from the discharge port 1c.

Thus, returning to FIG. 3A, one cycle of FIGS. 3A to 3F is completed. In FIG. 3A, the suction port 1b and the discharge port 1c communicate with each other via the cylinder chamber 1a.
Is closed by a valve not shown, so that the refrigerant gas does not return to the cylinder chamber 1a from the discharge port 1c. As described above, by repeating the cycle of FIGS. 3A to 3F, the oscillating rotary compressor sucks the refrigerant gas into the suction chamber 10 of the housing 1 from the suction port 1b. An operation of compressing the refrigerant gas by the compression chamber 11 of the housing 1 and discharging the refrigerant gas from the discharge port 1c is performed.

In the above embodiment, the grooves 21 and 22 provided on the inner peripheral surface of the rotor 2 and the grooves 23 and 22 are provided on the outer peripheral surface of the eccentric disk 3a.
The circumferential length of 24 is set to approximately 180 degrees as a rotation angle, but is not limited to the above. For example, the circumferential length of the grooves 21 and 22 provided on the inner peripheral surface of the rotor 2 and the grooves 23 and 24 provided on the outer peripheral surface of the eccentric disk 3a may be approximately 150 degrees.

In the above embodiment, grooves 21 and 22 are provided at both ends in the axial direction on the inner peripheral surface of the rotor 2, and grooves 23 and 24 are provided at both ends in the axial direction on the outer peripheral surface of the eccentric disk 3a. ,
Although the two sets of grooves 21 and 23 and the grooves 22 and 24 are opposed to each other, the inner peripheral surface of the rotor 2 and the eccentric disk 3a
A set of grooves may be provided at the center in the axial direction with respect to the outer peripheral surface.

Further, in the above embodiment, the rotor 2 and the blade 2a are integrally formed, and the cylinder chamber 1a is divided into the suction chamber 10 and the compression chamber 11 by the blade 2a.
The blade may not be integral with the rotor, and the tip of the blade may be slidably fitted in a U-shaped groove provided on the outer periphery of the rotor.

[0025]

As is apparent from the above description, the oscillating rotary compressor of the present invention has a groove on the inner peripheral surface of the roller on the suction chamber side, and the roller compresses the refrigerant gas to a predetermined pressure or more. A groove is provided on the outer peripheral surface of the eccentric disk on the suction chamber side in the direction in which the resultant force of the refrigerant gas acting on the roller acts during the compression stroke performed. Therefore, according to the present invention, when the compression of the refrigerant gas is not more than the predetermined pressure, the groove provided on the inner peripheral surface of the roller is on the suction chamber side, and the groove provided on the outer peripheral surface of the eccentric disk is Since it is on the compression chamber side, the width of the inner peripheral surface of the roller on the suction chamber side and the width of the outer peripheral surface of the eccentric disk on the compression chamber side have no grooves on the inner peripheral surface of the roller and the outer peripheral surface of the eccentric disk. It is smaller than a rotary compressor. Further, when the compression of the refrigerant gas is equal to or higher than the predetermined pressure, the groove provided on the inner peripheral surface of the roller is on the suction chamber side, and the groove provided on the outer peripheral surface of the eccentric disk is on the suction chamber side. The contact surface between the inner peripheral surface of the roller on the compression chamber side and the outer peripheral surface of the eccentric disk, where the contact pressure increases due to the resultant force of the pressure of the compressed refrigerant gas, has a predetermined width without grooves, It can withstand the above contact pressure. On the other hand, the width of the inner peripheral surface of the roller on the suction chamber side and the width of the outer peripheral surface of the eccentric disk, where the contact pressure is conversely reduced, are reduced by the respective grooves. As described above, even if the pressure of the refrigerant gas in the compression chamber becomes equal to or higher than the predetermined pressure and the roller is strongly pressed against the eccentric disk, a groove is formed on the outer peripheral surface of the eccentric disk on the compression chamber side where the roller is pressed. And the inner peripheral surface of the roller on the compression chamber side has no groove, so the contact area between the eccentric disk and the roller pressing against each other on the compression chamber side is increased, and their surface pressure is reduced. Therefore, damage such as seizure does not occur. On the other hand, since the groove is formed on the inner peripheral surface of the eccentric disk on the suction chamber side, the groove is formed on the inner peripheral surface of the roller on the suction chamber side. The area of the parts that slide with each other is reduced, and the sliding resistance is reduced.
When the groove on the inner peripheral surface of the roller and the groove on the outer peripheral surface of the eccentric disk face each other, the distance between the bottoms of both grooves increases, so that the thickness of the lubricating oil layer increases and the viscous resistance decreases. Therefore, the sliding resistance and the viscous resistance of the lubricating oil can be reduced, and the power loss can be greatly reduced as compared with the conventional oscillating rotary compressor.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oscillating rotary compressor according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 (a), (b), (c), (d),
(E), (f) is sectional drawing which showed the state of each rotation position of the said oscillating rotary compressor, respectively.

FIG. 4 is a sectional view of a conventional rotary compressor.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... Cylinder chamber, 2 ... Roller, 3 ...
Rotating shaft, 3a: eccentric disk, 4, 5: swing bush, 10
... suction chamber, 11 ... compression chamber, 12 ... hole.

Claims (1)

(57) [Claims] 1. A housing (1, 6, 7) having a cylinder chamber (1a) and a hole (12) opening to the cylinder chamber (1a), and a roller (2) disposed in the cylinder chamber (1a). ), An eccentric disk (3a) eccentrically fixed to the rotating shaft (3) and rotatably fitted to the inner periphery of the roller (2), and connected to the roller (2). An oscillating rotary compressor having a blade (2a) which is fitted in a hole (12) so as to be able to protrude and retract so as to partition the cylinder chamber (1a) into a suction chamber (10) and a compression chamber (11). A groove (2) is formed in the inner peripheral surface of the roller (2) on the suction chamber (10) side.
1, 2), and when the roller (2) is in the compression stroke of compressing the refrigerant gas to a predetermined pressure or more,
Grooves (23, 24) are provided on the outer peripheral surface of the eccentric disk (3a) on the suction chamber (10) side in the direction in which the resultant force of the pressure of the refrigerant gas acting on the roller (2) acts. An oscillating rotary compressor characterized by the following characteristics.