JPH05312169A - Rotary compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] While utilizing the structure in which the roller 3 is not rotated by using the swinging blade 6, leakage in the tangential direction between the cylinder chamber 1 and the roller 3 is reduced, and the volumetric efficiency is reduced. To improve sufficiently. [Structure] The inner surface of the cylinder chamber 1 in the first half of the compression stroke is a circular inner surface 11, and the inner surface of the cylinder chamber 1 in the latter half of the compression stroke is a first half circle, with a straight line a connecting the crankshaft axis O and the center S of the oscillator 8 as a boundary. The outer surface of the roller 3 is formed on the elliptical inner surface 12 having the diameter of the inner surface 11 as a major axis, and the outer surface of the roller 3 adjacent to the circular inner surface 11 is the circular outer surface 31, and the outer surface of the roller 3 adjacent to the elliptical inner surface 12 is the oval outer surface. 32, and the elliptical inner surface 12 and the elliptical outer surface 32 are brought close to each other in the latter half of the compression stroke,
A sufficient seal length was secured in the tangential direction, and leakage from the high pressure chamber 50 to the low pressure chamber 40 was reduced in the latter half of the compression stroke where the differential pressure was large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is widely used as a refrigerant compressor or the like in a refrigerating machine, and a blade is provided so as to project on an outer peripheral portion of a revolving roller, and the blade can freely move back and forth on a swingable swing body. The present invention relates to a rotary compressor having a so-called swinging blade structure that is received.

[0002]

2. Description of the Related Art A conventional rotary compressor is a practical rotary compressor.
As is known in Japanese Laid-Open Patent Publication No. -114082, the head portion of a blade formed separately from the roller is brought into contact with the outer peripheral portion of the roller to divide the cylinder chamber into a low pressure chamber and a high pressure chamber. However, there is a drawback that leakage easily occurs from the high pressure chamber to the low pressure chamber via the contact portion between the roller and the blade.

For this reason, as previously proposed by the present applicant (Japanese Patent Application No. 3-242933) and shown in FIG. 3, a cylindrical roller R fitted to the eccentric shaft portion P of the crankshaft is used. A swinging body having a blade B integrally projecting on the outer peripheral portion and a receiving groove M for receiving the projecting tip side of the blade B freely in the radial outside of a circular cylinder chamber Q provided in the cylinder C. E is supported, the roller R is revolved in the cylinder chamber Q by the eccentric rotation of the eccentric shaft portion P, the low pressure gas taken into the low pressure chamber L from the suction port J is compressed, and the high pressure gas is discharged from the high pressure chamber H. It discharges through the outlet T. In this way, the blade B and the roller R are integrated and the contact between them is eliminated, so that leakage can be reduced and volumetric efficiency can be improved.

[0004]

However, in the above, although the leakage that has occurred between the contact portions of the blade B and the roller R can be eliminated, the circular outer surface of the roller R is provided on the circular inner surface of the cylinder chamber Q. Since the high pressure chamber H and the low pressure chamber L are sealed by the close proximity of these circular surfaces, a sufficient seal length is provided in the tangential direction of the proximity portion between the cylinder chamber Q and the roller R. Therefore, in the latter half of the compression stroke in which the rotation angle of the blade B starting from the position of the blade B in the clockwise direction exceeds 180 degrees and reaches 360 degrees, the high pressure chamber H to the low pressure chamber H is not particularly secured. A relatively large amount of gas leaks toward L due to the pressure difference between the L and L, and there is a problem that the volumetric efficiency cannot be sufficiently improved.

In the present invention, while utilizing the structure in which the roller is not rotated by using the swinging blade, leakage in the tangential direction in the vicinity of the cylinder chamber and the roller is reduced, and the volume efficiency is sufficiently improved. The object is to provide a rotary compressor that can be used.

[0006]

In order to achieve the above object, therefore, as shown in FIGS. 1 and 2, the cylinder chamber 1
And a roller 3 that is fitted to the eccentric shaft portion 90 of the crankshaft 9 and revolves inside the cylinder chamber 1.
And a blade 6 protruding from the outer peripheral portion of the roller 3 for partitioning the inside of the cylinder chamber 1 into a low pressure chamber 40 communicating with the suction port 4 and a high pressure chamber 50 communicating with the discharge port 5, and a protrusion of the blade 6. A rotary compressor having a receiving groove 7 for freely advancing and retreating the tip end side, and an oscillating body 8 oscillatingly supported at a radially outer portion of the cylinder chamber 1, the rotary compressor comprising: The rotation center O and the swing center S of the swing body 8
The inner surface of the cylinder chamber 1 in the latter half of the compression stroke where the discharge port 5 is opened is formed as an elliptical inner surface 12 having a major axis on the straight line a, with the straight line a connecting The outer surface of the roller 3 adjacent to the elliptical inner surface 12 is formed as an elliptical outer surface 32.

[0007]

When the revolution angle of the roller 3 advances from the state of the first half of the compression stroke shown in FIG. 1 to the state of the latter half of the compression stroke shown in FIG. 2, the elliptical outer surface of the roller 3 is attached to the elliptical inner surface 12 of the cylinder chamber 1. 32 are close to each other, and the high-pressure chamber 50 and the low-pressure chamber 40 are sealed by the close proximity of the elliptical inner surface 12 and the elliptical outer surface 32, so that the tangential direction of the proximity portion between the cylinder chamber 1 and the roller 3 is sufficient. It is possible to secure a sufficient seal length, and in the latter half of the compression stroke where the differential pressure is large, the high pressure chamber 50
It is possible to reduce the leakage from the low pressure chamber 40 to the low pressure chamber 40.

[0008]

1 and 2 show a rotary compressor for compressing a refrigerant, which is fitted into a cylinder 2 having a cylinder chamber 1 and an eccentric shaft portion 90 of a crankshaft 9, A plate that revolves around the inside of the cylinder 3 and a projecting member integrally formed on the outer peripheral portion of the roller 3 to divide the inside of the cylinder chamber 1 into a low pressure chamber 40 communicating with the suction port 4 and a high pressure chamber 50 communicating with the discharge port 5. A cylindrical blade 6 and a receiving groove 7 for receiving the protruding tip side of the blade 6 freely advancing and retreating, and swingably supporting the inside of a holding hole 10 provided at a radially outer portion of the cylinder chamber 1. The oscillating body 8 is provided, and the roller 3 is revolved clockwise in the interior of the cylinder chamber 1 by the eccentric rotation of the eccentric shaft portion 90 accompanying the rotation of the drive shaft 9 to compress the low-pressure gas taken in from the suction port 4, Open the discharge valve 51 from the discharge port 5 to close the high pressure gas And so as to discharge into the casing. Incidentally, 52 is a valve retainer, and 91 is an oil supply hole for carrying lubricating oil. The upper and lower sides of the cylinder chamber 1 in the axial direction are closed by front and rear heads (not shown).

With the above construction, the rotation center O of the crankshaft 9
And a swinging center S of the swinging body 8 as a boundary, the inner surface of the cylinder chamber 1 in the first half of the compression stroke where the suction port 4 is opened is a circular inner surface 11, and the discharge port 5 is opened. The inner surface of the cylinder chamber 1 in the latter half of the stroke is formed as an elliptical inner surface 12 having a major axis having a length equal to the diameter of the circular inner surface 11 of the first half on the straight line a, and is close to the circular inner surface 11. The outer surface of the roller 3 is a circular outer surface 3
First, the outer surface of the roller 3 adjacent to the inner surface 12 of the ellipse is formed into the outer surface 32 of the ellipse.

Thus, due to the eccentric rotation of the eccentric shaft portion 90 caused by the rotation of the crankshaft 9, the roller 3 itself moves forward and backward with respect to the receiving groove 7 of the blade 6 and the oscillating operation of the oscillating body 8, while the roller 3 itself Since it can be revolved in the cylinder chamber 1 without rotating, the circular outer surface 31 of the roller 3 is attached to the circular inner surface 11 of the cylinder chamber 1.
The elliptical outer surface 32 of the roller 3 comes close to the elliptical inner surface 12 of FIG. And in this case
When the revolution angle of the roller 3 advances from the state of the first half of the compression stroke shown in FIG. 1 to the state of the latter half of the compression stroke shown in FIG.
The elliptical outer surface 32 of the roller 3 is close to the elliptical inner surface 12 of the cylinder chamber 1, and these elliptical inner surface 12 and elliptical outer surface 32 are provided.
Since the high-pressure chamber 50 and the low-pressure chamber 40 are sealed due to the proximity with, the sufficient sealing length can be secured in the tangential direction of the proximity portion between the cylinder chamber 1 and the roller 3, and the differential pressure is large. In the latter half of the compression stroke, leakage from the high pressure chamber 50 to the low pressure chamber 40 can be reduced, and the volumetric efficiency can be sufficiently improved.

[0011]

As described above, according to the present invention, the blade 6 can be oscillated to reduce the leakage between the blade 6 and the roller 3, and the tangential direction between the cylinder chamber 1 and the roller 3 can be reduced. Leakage can be reduced and volumetric efficiency can be sufficiently improved.

[Brief description of drawings]

FIG. 1 is a sectional view of the first half of a compression stroke in a rotary compressor of the present invention.

FIG. 2 is a sectional view of the latter half of the compression stroke.

FIG. 3 is a sectional view of a rotary compressor according to the prior art.

[Explanation of symbols]

1; cylinder chamber, 12; elliptical inner surface, 2; cylinder,
3; roller, 32; oval outer surface, 4; suction port, 40; low pressure chamber, 5; discharge port, 50; high pressure chamber, 6; blade, 7;
Receiving groove, 8; Oscillator, 9; Crank shaft, 90; Eccentric shaft part

Claims (1)

[Claims] 1. A cylinder 2 having a cylinder chamber 1, a roller 3 fitted to an eccentric shaft portion 90 of a crankshaft 9 and revolving inside the cylinder chamber 1, and a roller 3 protruding from the outer peripheral portion of the roller 3. , A blade 6 for partitioning the inside of the cylinder chamber 1 into a low-pressure chamber 40 communicating with the suction port 4 and a high-pressure chamber 50 communicating with the discharge port 5, and a receiving groove 7 for receiving the projecting tip side of the blade 6 freely moving forward and backward. A rotary compressor having a swing body 8 swingably supported at a radially outer portion of the cylinder chamber 1, wherein a rotation center O of the crankshaft 9 and a swing center of the swing body 8 are provided. The inner surface of the cylinder chamber 1 in the latter half of the compression stroke where the discharge port 5 is opened is formed as an elliptical inner surface 12 having a long axis on the straight line a, with the straight line a connecting S and S as the boundary. The roller 3 close to the elliptical inner surface 12 Rotary compressor, characterized by forming the outer surface elliptical outer surface 32.