JP2768114B2 - 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 a rotary compressor widely used as a refrigerant compressor in a refrigeration system.

[0002]

2. Description of the Related Art Conventionally, this kind of compressor has been disclosed in
As shown in FIG. 2 and the like, and as shown in FIG. 2, a single cylinder C having a circular cylinder chamber Q and a eccentric pin portion E of a crankshaft D that revolves inside the cylinder chamber Q are provided. A roller R comprising a cylinder; and a blade B having a head in contact with the outer peripheral surface of the roller R to partition the inside of the cylinder chamber Q into a suction chamber L and a compression chamber H. The gas is compressed so that the high-pressure gas is discharged from the discharge port K. Thus, in this configuration,
The axis O of the crankshaft D needs to coincide with the center S of the cylinder chamber Q. Therefore, over the entire rotation angle of the crankshaft D advanced clockwise with respect to the position of the blade B, the revolution speed of the roller R is , A constant value synchronized with the rotation of the crankshaft D.

[0003]

However, in the above, since the revolving speed of the roller R is constant over the entire rotation angle, the compression chamber H becomes smaller than the suction chamber L. In the high pressure rotation region in the latter half of the rotation angle at which the pressure difference with L increases, the amount of high pressure gas leaking from the compression chamber H to the suction chamber L via the gap between the outer peripheral surface of the roller R and the inner peripheral surface of the cylinder chamber Q is large. However, there is a problem that the volumetric efficiency is reduced. This tendency is particularly strong in low-speed compressors.

In the present invention, the revolution speed of the roller in the high-pressure rotation region where leakage is a problem is increased by increasing the revolution speed of the roller relative to the low-pressure rotation region by adding a unique idea to the revolving mechanism of the roller with respect to the cylinder chamber. It is a main object of the present invention to provide a rotary compressor capable of shortening a leak time from a gas to a suction chamber and improving volumetric efficiency.

[0005]

In order to achieve the main object, as shown in FIG. 1, a cylinder 2 having a cylinder chamber 1 and an eccentric pin portion 4 of a crankshaft 3 are fitted into the cylinder 2 as shown in FIG. In a rotary compressor provided with a roller 5 revolving inside the chamber 1 and a blade 8 dividing the inside of the cylinder chamber 1 into a suction chamber 6 and a compression chamber 7, the roller 5 rotates together with the crankshaft 3. And the axis O of the crankshaft 3 is connected to the cylinder chamber 1.
The compression chamber 7 is eccentric to a low-pressure rotation region larger than the suction chamber 6 with respect to the center S of the roller 5, and the inner peripheral fitting hole 51 of the roller 5 is revolved with respect to the outer cylindrical surface 52. Accordingly, the outer peripheral cylindrical surface 52 is decentered so as to continuously approach the inner peripheral surface of the cylinder chamber 1.

In this case, a blade 8 protrudes from an outer peripheral cylindrical surface 52 of the roller 5, and an oscillating body 9 that rotatably supports the protruding tip side of the blade 8 outside the cylinder chamber 1.
It is preferable that the roller 5 is configured to be non-rotating type by freely engaging with the roller.

[0007]

As shown in FIG. 1, let F and G denote points where the center line passing through the center S of the cylinder chamber 1 and separating the low-pressure rotation region and the high-pressure rotation region intersects the inner peripheral surface of the cylinder chamber 1. When the proximity point between the cylinder 5 and the cylinder chamber 1 moves between the intersections F and G in the low-pressure rotation region, the crankshaft 3 needs to rotate by an angle θa larger than the movement angle of the proximity point, Conversely, when the proximity point between the roller 5 and the cylinder chamber 1 moves between the intersections G and F in the high-pressure rotation region, the crankshaft 3 rotates by an angle θb smaller than the movement angle of the proximity point. become. Since the crankshaft 3 is rotating at a constant speed, the rollers 5 in the high pressure rotation region are eventually
Is higher than the revolving speed in the low-pressure rotation region. As described above, the center O of the crankshaft 3 is set at the center S of the cylinder chamber 1 in order to make the revolution speed of the roller 5 different.
Although the roller 5 is eccentric, the roller 5 is of a non-rotating type and the inner peripheral portion fitting hole 51 of the roller 5 is eccentric with respect to the outer peripheral cylindrical surface 52. Can be continuously brought close to the inner peripheral surface of the cylinder chamber 1, and a normal compression operation can be performed.

[0008] In this manner, as the revolving speed of the roller 5 in the high-speed rotation region increases, the leakage time from the compression chamber 7 to the suction chamber 6 can be shortened, and the reduction in volumetric efficiency can be suppressed.

In the above case, the blade 8 protrudes from the outer peripheral cylindrical surface 52 of the roller 5 and the oscillating body 9 rotatably supports the protruding tip side of the blade 8 outside the cylinder chamber 1. When the roller 5 is of a non-rotating type, the high-pressure fluid flows from the compression chamber 7 to the suction chamber 6 through a gap between the outer peripheral cylindrical surface 52 of the roller 5 and the blade 8. Leakage can also be prevented, and a decrease in volumetric efficiency can be suppressed even better.

[0010]

FIG. 1 shows a rotary compressor for compressing a refrigerant, in which a cylinder 2 having a circular cylinder chamber 1 is provided.
And a roller 5 which is fitted to the eccentric pin portion 4 of the crankshaft 3 linked to the motor and revolves inside the cylinder chamber 1, and a blade 8 which partitions the inside of the cylinder chamber 1 into a suction chamber 6 and a compression chamber 7. And compresses the low-pressure gas taken in from the suction port 11, and discharges the compressed high-pressure gas through the discharge hole 12 into the closed casing in which the cylinder 2 is disposed. In addition, 13 is a discharge valve, 14 is a valve presser,
The upper and lower portions of the cylinder chamber 1 in the axial direction are closed by front and rear heads mounted on the upper and lower surfaces of the cylinder 2.

In the above configuration, the blade 8 is integrally provided on the outer peripheral cylindrical surface 52 of the roller 5, and the leading end of the blade 8 is rotated to the support hole 15 provided outside the cylinder chamber 1. Receiving groove 91 of oscillator 9 freely supported
The roller 5 is configured to be non-rotating so as not to rotate with the crankshaft 3. Further, the axis O of the crankshaft 3 is eccentric with respect to the center S of the cylinder chamber 1 in a low-pressure rotation region where the compression chamber 7 is larger than the suction chamber 6. Further, the center X of the inner peripheral portion fitting hole 51 of the roller 5 is set to the center Y of the outer peripheral cylindrical surface 52, and the outer peripheral cylindrical surface 5
2 is eccentric so as to continuously approach the inner peripheral surface of the cylinder chamber 1.

As a result, the revolving speed of the roller 5 in the high-pressure rotation region is higher than the revolving speed in the low-pressure rotation region, and the revolving speed of the roller 5 in the high-speed rotation region is increased from the compression chamber 7. The leakage time to the suction chamber 6 can be reduced,
A decrease in volumetric efficiency can be suppressed.

Further, a blade 8 protrudes from an outer peripheral cylindrical surface 52 of the roller 5, and a protruding tip side of the blade 8 is freely engaged with an oscillating body 9 rotatably supported outside the cylinder chamber 1. Since the rollers 5 are non-rotating,
It is possible to prevent the high-pressure fluid from leaking from the compression chamber 7 to the suction chamber 6 through the gap between the outer peripheral cylindrical surface 52 of the roller 5 and the blade 8, and it is possible to further suppress the reduction in volumetric efficiency.

[0014]

As described above, according to the first aspect of the present invention, since the revolving speed of the roller 5 in the high-speed rotation region is increased, the leakage of the high-pressure fluid from the compression chamber 7 to the suction chamber 6 can be reduced, and the volume can be reduced. Efficiency can be improved.

According to the second aspect of the present invention, the leakage between the outer peripheral cylindrical surface 52 of the roller 5 and the blade 8 can be reduced by utilizing the structure in which the roller 5 is made non-rotating. Volumetric efficiency can be better improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary compressor according to the present invention.

FIG. 2 is a sectional view of a conventional rotary compressor.

[Explanation of symbols]

1; cylinder chamber; 2; cylinder; 3; crankshaft, 4;
Eccentric pin part, 5; roller, 6; suction chamber, 7; compression chamber,
8; blade, 9; rocking body, 51; inner peripheral portion fitting hole, 5
2: Outer peripheral cylinder surface

Claims (2)

(57) [Claims] 1. A cylinder 2 having a cylinder chamber 1, a roller 5 fitted to an eccentric pin 4 of a crankshaft 3 and revolving inside the cylinder chamber 1, and a suction chamber 6 inside the cylinder chamber 1. A rotary compressor provided with a blade and a compression chamber.
And the compression chamber 7 is eccentric with respect to the center S of the cylinder chamber 1 in a low-pressure rotation region in which the compression chamber 7 is larger than the suction chamber 6. The inner peripheral portion fitting hole 51 of the roller 5 is set in a relationship with the outer peripheral cylindrical surface 52 so that the outer peripheral cylindrical surface 52 continuously approaches the inner peripheral surface of the cylinder chamber 1 as the roller 5 revolves. A rotary compressor characterized by being eccentric. 2. A blade 8 protrudes from a cylindrical surface 52 of an outer peripheral portion of a roller 5, and a tip end of the blade 8 is engaged with an oscillating body 9 rotatably supported outside the cylinder chamber 1 so as to freely advance and retreat. The rotary compressor according to claim 1, wherein the rollers (5) are non-rotating.