KR20030008523A - Apparatus for fixed the axis of rotation in a rotary compressor - Google Patents

Abstract

PURPOSE: An apparatus for fixing rotating shaft of rotary compressor is provided to achieve improved compression efficiency by reducing a friction area and friction loss. CONSTITUTION: A rotary compressor comprises a closed container(10) having an inlet(1) and an outlet(2); a motor unit(20) mounted within the closed container; a compressor unit(130) connected to the motor unit, and mounted within the closed container so as to compress a refrigerant; and an accumulator(40) connected to the inlet of the closed container and the compressor unit. The compressor unit includes an upper bearing(132), a lower bearing(133) and a roller(136) which has inner cross sections shaped as polygon so as to reduce a friction area with respect to a rotating shaft of the compressor unit.

Description

Rotary shaft fixing device of rotary compressor {APPARATUS FOR FIXED THE AXIS OF ROTATION IN A ROTARY COMPRESSOR}

The present invention relates to a rotating shaft fixing device of the rotary compressor, more specifically, the upper shaft, the lower bearing, and the rotating shaft fixing device of the rotary compressor to reduce the friction by reducing the contact area when the rotating shaft is in contact with the rotating shaft It is about.

In general, a rotary compressor compresses the refrigerant by rotating the rotor in the cylinder without centrifugal force. The rotary compressor rotates and rotates along the inner circumferential surface of the cylinder in conjunction with the rotation of the eccentric roller mounted on the lower part of the crankshaft. It is a device for suction and compression.

The rotary compressor forms a sealed space therein as shown in FIG. 1, and an inlet 1 and an outlet 2 are formed to seal the container 10 through which the refrigerant is sucked and discharged, and the container 10. And a power mechanism unit 20 for generating a rotational force by the interaction of the stator 1 and the rotor 22 mounted inside the drive unit, and connected to the power mechanism unit 20 and driven to compress the sucked refrigerant. An accumulator connected to the compression mechanism part 30 mounted inside the sealed container 10 and the suction port 1 of the sealed container 10 and filtering out impurities and liquid refrigerant from the refrigerant sucked into the compression mechanism part 30. It consists of 40.

The compression mechanism 30 is press-fitted to the inner surface of the rotor 22 and the rotary shaft 31 of the circular cross section in which the eccentric portion 31a is formed at the bottom, and the eccentric portion 31a is accommodated therein. The upper bearing 32 and the lower bearing 33 supporting the rotating shaft 31 are coupled by the bolts 34 and are formed to penetrate radially through the suction passage 35a to be mounted inside the sealed container 10. An inner surface is in contact with 35 and an eccentric portion 31a formed on one side of the rotation shaft 31, and an outer surface is in contact with an inner surface of the cylinder 35, and rotates and rotates by rotation of the eccentric portion 31a. 36 and a vane mounted to the cylinder 35 to slide the roller 36 in contact with an outer surface thereof to separate the inside of the cylinder 35 into a high pressure portion and a low pressure portion and to linearly reciprocate in the direction of the center of the cylinder 35. 37).

In addition, a discharge port 32a for discharging the compressed refrigerant is formed at a predetermined portion of the upper bearing 32, and the discharge port 32a discharges to discharge only when the pressure of the compressed refrigerant becomes higher than or equal to a predetermined value. A valve (not shown) is mounted, and a silencer 38 is mounted on the upper bearing 32 to reduce the discharge noise.

When the current is supplied to the rotary compressor configured as described above, the rotor 22 and the rotating shaft 31 rotate by the interaction of the stator 21 and the rotor 22, and the rotation shaft 31 of the The roller 36 is rotated in contact with the vanes 37 inside the cylinder 35 by the rotation of the eccentric portion 31a formed on one side, and through the accumulator 40 by the rotation. The suctioned low temperature and low pressure refrigerant is compressed to a high temperature and high pressure state.

FIG. 2 is a partial sectional view of the AA part shown in FIG. 1, FIG. 3 is a partial sectional view of the BB part shown in FIG. 1, and FIG. 4 is a partial sectional view of the CC part shown in FIG. 1, as shown in FIG. 31, the outer circumferential surface and the contact portion in which the upper bearing 32 and the lower bearing 33 slide are brought into surface contact, and the outer circumferential surface of the eccentric portion 31a of the rotating shaft 31 and the roller 36 Since the sliding contact also makes a surface contact, a problem occurs in that the efficiency of the rotary compressor is reduced by frictional loss during sliding.

An object of the present invention devised in view of the above point is to minimize the contact area in which the rotating shaft and the upper bearing, the lower bearing and the roller slide, thereby reducing the frictional loss caused by the sliding rotary compressor to increase the compression efficiency of the rotary compressor. It is to provide a rotating shaft fixing device of.

1 is a cross-sectional view of a conventional rotary compressor,

2 is a partial cross-sectional view of the A-A portion shown in FIG.

3 is a partial cross-sectional view of the B-B portion shown in FIG.

4 is a partial cross-sectional view of the C-C portion shown in FIG.

5 is a cross-sectional view of a rotary compressor equipped with a rotating shaft fixing device of the rotary compressor of one embodiment of the present invention;

6 is a partial cross-sectional view of the A-A portion shown in FIG.

7 is a partial cross-sectional view of the B-B portion shown in FIG. 5;

8 is a partial cross-sectional view of the C-C portion shown in FIG.

9 is a rotation shaft fixing device of a rotary compressor according to another embodiment of the present invention, another partial cross-sectional view of the same portion as the A-A shown in FIG.

10 is a rotation shaft fixing device of a rotary compressor according to another embodiment of the present invention, the partial cross-sectional view of the same portion as the B-B shown in FIG.

FIG. 11 is a cross-sectional view of still another part of the same portion as the C-C part shown in FIG.

** Description of symbols for the main parts of the drawing **

130: compressor section 131, 231: rotating shaft

131a, 231a: eccentric portion 132, 232: upper bearing

132a: discharge port 133, 233: lower bearing

134: bolt 135: cylinder

135a: suction 136, 236: roller

137: vane 138: silencer

The rotary shaft fixing device of the rotary compressor for achieving the object of the invention as described above is a rotary compressor supported by the upper bearing and the lower bearing and configured to compress the refrigerant by rotating the inside of the cylinder roller mounted on one side of the rotating shaft In the above, the upper bearing, the lower bearing, the roller, etc., is formed in a polygonal cross-sectional shape in order to reduce the friction area with the rotating shaft is composed of an inner diameter portion in contact with the rotating shaft.

Or a rotary compressor supported by an upper bearing and a lower bearing and mounted on one side of a rotating shaft to rotate the inside of the cylinder to compress the refrigerant, wherein the rotating shaft includes the upper bearing, the lower bearing, and the roller. In order to reduce the friction area with the back, it is formed in a polygonal cross-sectional shape and consists of a contact portion which contacts the upper bearing, the lower bearing, and the roller.

Referring to the rotary shaft fixing device of a rotary compressor of an embodiment of the present invention in more detail with reference to the drawings as follows, the same parts as in the prior art will be described with the same reference numerals.

FIG. 5 is a cross-sectional view of a rotary compressor equipped with a rotating shaft fixing device of a rotary compressor according to an embodiment of the present invention. As shown in FIG. 5, the inlet 1 and the discharge port 2 are formed in a sealed accommodation space therein. The sealed container 10 formed, the power mechanism unit 20 mounted inside the sealed container 10, and connected to the power mechanism unit 20 and driven to compress the refrigerant inside the sealed container 10. Compressor part 30 to be mounted, and the accumulator 40 is connected to the suction port 1 of the sealed container 10 and communicates with the compression mechanism part (30).

The electric motor unit 20 is composed of a stator 21 mounted inside the hermetic container 10 and a rotor 22 formed of a permanent magnet rotating inside the stator 21.

The compression mechanism 130 is press-fitted to the inner surface of the rotor 22 is mounted, the rotary shaft 131 is formed with an eccentric portion 131a at the bottom, and the eccentric portion 131a is accommodated therein and the rotation shaft 131 ), The upper bearing 132 and the lower bearing 133 are coupled by the bolt 134, and the cylinder 135 is formed to be radially penetrated through the suction passage 135a to be mounted inside the sealed container 10. ) And the outer surface of the eccentric portion 131a formed on one side of the rotating shaft 131 contact the inner surface, the outer surface is in contact with the inner surface of the cylinder 135 to rotate and rotate by the rotation of the eccentric portion (131a) Sliding contact with the roller 136 and the outer peripheral surface of the roller 136 to separate the inside of the cylinder 135 into a high pressure portion and a low pressure portion to the cylinder 135 to linearly reciprocate in the direction of the center of the cylinder 135 It consists of a mounted vane 137.

In addition, a discharge port 132a for discharging the compressed refrigerant is formed in a predetermined portion of the upper bearing 132, and the discharge port 132a is discharged only when the pressure of the compressed refrigerant becomes higher than a predetermined value. A discharge valve (not shown) is mounted, and a silencer 138 is mounted on an upper portion of the upper bearing 132 to reduce discharge noise.

When a current is supplied to the hermetic rotary compressor configured as described above, the rotating shaft 131 is rotated by the interaction of the stator 21 and the rotor 22, and a piece formed on one side of the rotating shaft 131. The roller 136 is rotated in contact with the vane 137 inside the cylinder 135 by the rotation of the core 131a, and the low temperature and low pressure sucked through the accumulator 40 by the rotation. Refrigerant is compressed to a state of high temperature and high pressure.

At this time, when the rotary shaft 131 is rotated, the contact portion that the friction is generated by sliding the rotary shaft 131 with the upper bearing 132, the roller 136, and the lower bearing 133 is formed as follows. .

FIG. 6 is a partial sectional view of the A-A part shown in FIG. 5, FIG. 7 is a partial sectional view of the B-B part shown in FIG. 5, and FIG. 8 is a partial sectional view of the C-C part shown in FIG.

As shown in FIG. 6, the inner surface of the upper bearing 132 in contact with the rotating shaft 131 is formed in a triangular cross-sectional shape so that the rotating shaft 131 and the upper bearing 132 are rotated when the rotating shaft 131 is rotated. The sliding contact is in line contact at three points.

As shown in FIG. 7, the inner surface of the roller 136, which is in contact with the eccentric portion 131a of the rotating shaft 131, is formed in a triangular cross-sectional shape, and the eccentric portion 131a and the eccentric portion 131 are rotated when the rotating shaft 131 is rotated. The contact where the roller 136 slides is in line contact at three points.

As shown in FIG. 8, an inner surface of the lower bearing 133 in contact with the rotating shaft 131 is formed in a triangular cross-section so that the rotating shaft 131 and the lower bearing 133 are rotated when the rotating shaft 131 is rotated. The sliding contact is in line contact at three points.

In this way, the sliding contact is in line contact, so the contact area is reduced, thereby reducing the frictional loss at the contact.

In addition, the inner surface contact portion of the upper bearing 132, the roller 136, and the lower bearing 133 in contact with the rotary shaft 131 and the eccentric portion 131a is formed in a polygonal cross-sectional shape to reduce the friction area, You can also reduce losses.

Similarly, another embodiment of the present invention for reducing the frictional loss in the contact with reference to the drawings in more detail as follows.

9 is a rotation shaft fixing device of a rotary compressor according to another embodiment of the present invention, which is another partial cross-sectional view of the same portion as the AA portion shown in FIG. 5, and FIG. 10 is another portion of the same portion as the BB portion shown in FIG. Another partial sectional drawing, FIG. 11 is another partial sectional drawing of the same site | part as the CC part shown in FIG.

As shown in FIG. 9, a predetermined portion of the outer circumferential surface of the rotating shaft 231 in contact with the upper bearing 232 is formed as a shaft having a triangular cross-sectional shape, and when the rotating shaft 231 rotates, the rotating shaft 231 and the upper bearing 232 are rotated. The contact where the) slides is in line contact at three points.

As shown in FIG. 10, a predetermined portion of the outer circumferential surface of the eccentric portion 231a of the rotary shaft 231, which is in contact with the inner surface of the roller 236, is formed as a shaft having a triangular cross-sectional shape to rotate in conjunction with the rotary shaft 231. When the 231a rotates, the contact portion in which the eccentric portion 231a and the roller 236 slide is in line contact at three points.

As shown in FIG. 11, a predetermined portion of the rotating shaft 231, which is in contact with the inner surface of the lower bearing 233, is formed as a shaft having a triangular cross-section so that the rotating shaft 231 and the lower bearing are rotated when the rotating shaft 231 is rotated. The contact portion at which 233 slides is in line contact at three points.

In this way, the sliding contact is in line contact, so the contact area is reduced, thereby reducing the frictional loss at the contact.

In addition, the contact surface of the outer circumferential surface of the rotating shaft 231 and the eccentric portion 231a in contact with the upper bearing 232, the roller 236, and the lower bearing 233 is formed in a polygonal cross-sectional shape to reduce the contact area, thereby reducing frictional losses. Can also be reduced.

As described above, when the rotary shaft rotates according to the present invention, the friction area between the upper bearing, the lower bearing, and the roller is reduced, so that the friction loss is reduced.

As described above, the rotating shaft fixing device of the rotary compressor according to the present invention forms an inner diameter portion of the upper bearing, the lower bearing, and the roller in contact with the rotating shaft in a polygonal cross-sectional shape to reduce the friction area, or the upper bearing, the lower bearing, and the roller. By reducing the friction area by forming the contact portion of the rotating shaft and the eccentric portion in contact with the back in a polygonal cross-sectional shape, the friction loss is reduced, thereby increasing the compression efficiency of the rotary compressor.

Claims (4)

In the rotary compressor supported by the upper bearing and the lower bearing and mounted on one side of the rotating shaft to rotate the inside of the cylinder to compress the refrigerant, The upper bearing, the lower bearing, the roller, etc., the rotation shaft fixing device of the rotary compressor, characterized in that formed in the polygonal cross-sectional shape in contact with the rotating shaft to reduce the friction area with the rotating shaft. The rotating shaft fixing apparatus of claim 1, wherein the inner diameter portion has a triangular cross-sectional shape. In the rotary compressor supported by the upper bearing and the lower bearing and mounted on one side of the rotating shaft to rotate the inside of the cylinder to compress the refrigerant, The rotary shaft is a rotary shaft of the rotary compressor, characterized in that formed in a polygonal cross-sectional shape in order to reduce the friction area between the upper bearing, the lower bearing, and the roller and the like contact with the upper bearing, the lower bearing, and the roller. Fixture. The rotating shaft fixing apparatus of claim 3, wherein the contact portion has a triangular cross-sectional shape.