JP2776134B2 - Rotary compressor - Google Patents

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 apparatus. A blade is protruded from an outer peripheral portion of a revolving roller, and the blade is freely received in a rotatable rocking body. The present invention relates to a rotary compressor having a so-called oscillating blade structure.

[0002]

2. Description of the Related Art An ordinary rotary compressor is disclosed in
As is known in JP-A-114082, the head of a blade formed separately from the roller is brought into contact with the outer periphery of the roller to partition the cylinder chamber into a suction chamber and a compression chamber. However, there is a drawback such that leakage easily occurs from the compression chamber to the suction chamber via the contact portion between the roller and the blade.

[0003] In view of the above, as proposed by the present applicant (Japanese Patent Application No. 3-242933) and shown in Figs. An oscillator S is rotatably supported at a radially outer portion of the cylinder chamber Q in the cylinder C, and the oscillator S
A receiving groove M for receiving the protruding tip side of the blade B over a relatively long span exceeding the rotation center O is formed, and the blade B advances and retreats to the receiving groove M with the revolution of the roller R due to the eccentric rotation of the crankpin P. And the rocking body S is rocked, and the low-pressure gas taken into the suction chamber L is compressed by the compression chamber H.
Compression. 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, according to the above, when the roller R and the blade B are displaced in the direction shown by the left arrow during the compression stroke, as shown in FIG. The groove M sticks to each other via a blade right end e and a groove left end g, and the compression chamber H can be well sealed to the suction chamber L by edge contact at these ends e and g. As shown in FIG. 6, the roller R and the blade B change their displacement in the direction shown by the right arrow just before the end of the compression stroke, and the tip of the blade B exceeds the rotation center O of the oscillator S. At this time, the left end g of the groove and the blade B are separated from each other, and the blades B are not in contact with each other via the ends e and g. There is a small gap between M and The high-pressure gas flows from the compression chamber H to the bottom of the receiving groove M through the gap, so that leakage to the suction chamber L is likely to occur, and the residual gas remaining at the bottom of the receiving groove M at the end of the compression stroke re-expands. However, there is a problem that the volume efficiency is also lowered.

[0005] It is an object of the present invention to reduce gas leakage through the outer peripheral portion of a roller by an oscillating blade structure.
It is an object of the present invention to provide a rotary compressor that can reduce gas leakage through a gap between a blade and a receiving groove and re-expansion of the leaked gas, and can further improve the volumetric efficiency.

[0006]

Therefore, in order to achieve the above object, first, as shown in FIGS. 1 and 2, a cylinder 2 having a cylinder chamber 1 and revolves inside the cylinder chamber 1. A roller 3, a blade 6 projecting from an outer peripheral portion of the roller 3, and partitioning the interior of the cylinder chamber 1 into a suction chamber 4 and a compression chamber 5, and a receiving end for freely receiving a protruding tip side of the blade 6. A rotary body having a groove and rotatably supported at a radially outer portion of the cylinder chamber, wherein the length of the blade and the radius of the rocker are set to When the tip of the blade 6 protrudes into the deepest part of the receiving groove 7, the relationship is set so that the tip of the blade 6 does not exceed the rotation center of the oscillating body 8.

In order to achieve the same purpose, second,
As shown in FIG. 3 or 4, a cylinder 2 having a cylinder chamber 1 and a roller 3 revolving inside the cylinder chamber 1
A blade 6 projecting from an outer peripheral portion of the roller 3 to partition the inside of the cylinder chamber 1 into a suction chamber 4 and a compression chamber 5;
A rotary compressor having a receiving groove for receiving a protruding tip side of the blade so as to freely advance and retreat, and a rocking body rotatably supported at a radially outer portion of the cylinder chamber; The center of the moving body 8 communicates with the receiving groove 7 in the axial direction of the rocking body 8, and when the tip of the blade 6 protrudes into the deepest part of the receiving groove 7, the tip of the blade 6 and the A cut hole 70 having a size whose contact end with the receiving groove 7 does not exceed the rotation center of the rocking body 8 is provided.

[0008]

According to the first means, as shown in FIG. 1, when the roller 3 and the blade 6 are displaced in the direction shown by the left arrow, the blade 6 and the receiving groove 7 are separated from the blade right end e by the groove. As shown in FIG. 2, the compression chamber 5 can be well sealed to the suction chamber 4 by edge contact with the left end g and edge contact at these ends e and g. Thus, even if the roller 3 and the blade 6 are displaced in the direction shown by the right arrow during the compression stroke, the tip of the blade 6 does not exceed the rotation center O of the oscillating body 8 and The receiving groove 7 sticks to each other via the blade right end e and the groove left end g, and the edge contact state is maintained via these two ends e and g. Good sealing can be achieved.

[0009] In the second means, as shown in FIG. 3 or FIG.
The contact end f between the tip side of the blade and the receiving groove 7 does not exceed the rotation center O of the rocking body 8, and the blade 6 and the receiving groove 7 are connected via the contact end f and the groove left end g. The compression chamber 5 can be sealed well to the suction chamber 4 while maintaining the edge contact state through these two ends f and g. Also, in the second means, the cut end 70 prevents the contact end f between the tip side of the blade 6 and the receiving groove 7 from exceeding the rotation center O of the oscillating body 8. It is not necessary to increase the radius of the oscillating body 8 as compared with the above-mentioned means, so that the configuration around the oscillating body 8 can be reduced in size.

[0010]

1 and 2 show a rotary compressor for compressing a refrigerant, in which a cylinder 2 having a circular cylinder chamber 1 and a roller 3 revolving inside the cylinder chamber 1 are shown.
And a cylinder chamber 1 protruding integrally with the outer peripheral portion of the roller 3.
Of the cylinder chamber 1 into a suction chamber 4 and a compression chamber 5, and a receiving groove 7 for freely receiving the protruding tip side of the blade 6, and provided at a radially outer portion of the cylinder chamber 1. A cylindrical rocking body 8 rotatably supported inside the holding hole 10 is provided. The rotation of the drive shaft 9 interlocked with the motor and the eccentric rotation of the crank pin 90 integrated therewith cause the roller 3 to move in the cylinder chamber. 1, it revolves clockwise in the clockwise direction, compresses the low-pressure gas taken in from the suction hole 11, and discharges the high-pressure gas from the discharge hole 12 through the discharge valve 13 into the closed casing. In addition, 14 is a valve retainer, 9
Reference numeral 1 denotes an oil supply hole for carrying lubricating oil, and the upper and lower portions in the axial direction of the cylinder chamber 1 are closed by front and rear heads, though not shown.

With the above construction, the length of the blade 6 and the radius of the oscillating body 8 are sequentially adjusted clockwise as the roller 3 progresses as shown in FIGS. 3 reaches the top dead center, the compression stroke ends, and even when the tip of the blade 6 enters the deepest portion of the receiving groove 7, the tip of the blade 6 Set a relationship that does not exceed.

As a result, as shown in FIG.
When the blade 6 is displaced in the direction indicated by the left arrow, the blade 6 and the receiving groove 7 are in contact with each other via the blade right tip e and the groove left end g, and at these ends e and g, Of course, the compression chamber 5 can be sealed well with the suction chamber 4 by the edge contact of FIG.
As shown in the figure, even if the roller 3 and the blade 6 are displaced in the direction shown by the right arrow while the compression stroke is in progress, the tip of the blade 6 does not exceed the rotation center O of the oscillator 8 and 6 and the receiving groove 7 are in contact with each other via the right end portion e of the blade and the left end portion g of the groove, and the edge contact state is maintained through these two ends e and g. 4 can be sealed well.

Accordingly, a small gap is left between the left side surface of the blade 6 and the receiving groove 7, so that the high-pressure gas can be prevented from flowing from the compression chamber 5 to the bottom of the receiving groove 7, and the suction through the receiving groove 7 can be suppressed. The leakage to the chamber 4 side can be reduced, and the residual gas remaining at the bottom of the receiving groove 7 at the end of the compression stroke can be prevented from re-expanding. The volume efficiency can be satisfactorily improved in combination with the dynamic system.

As shown in FIG. 3, the center of the rocking body 8 communicates with the receiving groove 7 in the axial direction of the rocking body 8, and the tip of the blade 6 protrudes into the deepest part of the receiving groove 7. When
A contact end f between the tip side of the blade 6 and the receiving groove 7
Is a circular hole 71 having a size not exceeding the rotation center O of the oscillator 8.
Alternatively, a cut hole 70 made of a semicircular hole 72 may be provided as shown in FIG.

Also in this case, as shown in FIG. 3 or FIG. 4, the contact end f between the tip end side of the blade 6 and the receiving groove 7 does not exceed the rotation center O of the rocking body 8, and The receiving groove 7 sticks to each other via the contact end f and the left end g of the groove, and the edge contact state is maintained through these two ends f and g. Good sealing can be achieved. In this case, the contact end f between the tip side of the blade 6 and the receiving groove 7 does not exceed the rotation center O of the oscillating body 8 by the cut hole 70 including the circular hole 71 or the semicircular hole 72. Therefore, the size of the oscillating body 8 can be reduced as compared with the embodiment shown in FIGS. 1 and 2, and the configuration around the oscillating body 8 can be downsized.

[0016]

As described above, according to the first aspect of the present invention, the length of the blade 6 and the radius of the oscillating body 8 are adjusted when the tip of the blade 6 enters the deepest portion of the receiving groove 7. Since the tip of the blade 6 is set so as not to exceed the rotation center of the oscillating body 8, a small gap is left between the blade 6 and the receiving groove 7, and high-pressure gas flows from the compression chamber 5 into the bottom of the receiving groove 7. Can be suppressed, gas leakage to the suction chamber 4 side through the receiving groove 7 can be reduced, and the residual gas remaining at the bottom of the receiving groove 7 at the end of the compression stroke can be prevented from re-expanding.
The volume efficiency can be improved satisfactorily together with the fact that the blade 6 is protrudingly provided on the outer peripheral portion of the roller 3 to form a swing type.

According to the second aspect of the present invention, the volume efficiency can be improved satisfactorily as described above, and the cut hole 70 can be improved.
As a result, the contact end between the tip side of the blade 6 and the receiving groove 7 does not exceed the center of rotation of the rocking body 8, so that the configuration around the rocking body 8 can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary compressor according to a first embodiment of the present invention during a compression stroke.

FIG. 2 is a cross-sectional view just before the end of a compression stroke according to the first embodiment.

FIG. 3 is a partial cross-sectional view just before the end of a compression stroke according to the second embodiment.

FIG. 4 is a partial cross-sectional view just before the end of a compression stroke according to the third embodiment.

FIG. 5 is a partial cross-sectional view of a rotary compressor according to the prior art during a compression stroke.

FIG. 6 is a partial cross-sectional view just before the end of the compression stroke.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Cylinder chamber, 2; Cylinder, 3; Roller, 4; Suction chamber, 5; Compression chamber, 6; Blade, 7; Receiving groove, 8; Oscillator, 9; Drive shaft, 90; hole,
10; holding hole, 11; suction hole, 12; discharge hole, 13; discharge valve, 14; valve retainer, 70; cut hole, 71;
72; semicircular hole

Claims (2)

(57) [Claims] A cylinder 2 having a cylinder chamber 1, a roller 3 revolving inside the cylinder chamber 1, and a projection protruding from an outer peripheral portion of the roller 3 to compress the interior of the cylinder chamber 1 into a suction chamber 4. A blade 6, which is partitioned into a chamber 5; and an oscillating body 8, which has a receiving groove 7 for receiving the protruding tip side of the blade 6 to freely advance and retreat, and which is rotatably supported at a radially outer portion of the cylinder chamber 1. When the tip of the blade 6 enters the deepest portion of the receiving groove 7, the tip of the blade 6 changes the length of the blade 6 and the radius of the swinging body 8. A rotary compressor, wherein the relationship is set so as not to exceed the rotation center of the moving body 8. 2. A cylinder 2 having a cylinder chamber 1, a roller 3 revolving inside the cylinder chamber 1, and a projection protruding from an outer peripheral portion of the roller 3. The interior of the cylinder chamber 1 is compressed with a suction chamber 4. A blade 6, which is partitioned into a chamber 5; and an oscillating body 8, which has a receiving groove 7 for receiving the protruding tip side of the blade 6 to freely advance and retreat, and which is rotatably supported at a radially outer portion of the cylinder chamber 1. A rotary compressor, wherein a central portion of the oscillator 8 communicates with the receiving groove 7 in the axial direction of the oscillator 8, and a tip of the blade 6 is connected to the receiving groove 7.
A contact hole between the tip end of the blade 6 and the receiving groove 7 is provided with a cut hole 70 whose size does not exceed the center of rotation of the rocking body 8 when the blade enters the deepest part of the blade 6. And a rotary compressor.