KR100679929B1 - Hermetic type compressor - Google Patents

Abstract

The present invention relates to a hermetic compressor, and an object of the present invention is to provide a hermetic compressor provided to improve the overall reliability of the product by improving the thrust bearing side lubrication structure provided to support the axial load of the rotating shaft.

To this end, the present invention is a frame provided with a hollow portion to be provided inside the sealed container in which an oil storage space is formed on the bottom; A rotating shaft rotatably installed on the frame so as to penetrate the hollow part and having an oil flow path guiding oil of the oil storage space upwardly; In the hermetic compressor including a thrust bearing installed in the bearing installation groove of the hollow part and provided to support the rotation shaft in the axial direction, the oil passage is provided to directly supply oil to the thrust bearing side.

Description

Hermetic Compressor {HERMETIC TYPE COMPRESSOR}

1 is a side cross-sectional view showing the overall structure of a hermetic compressor according to the present invention.

Figure 2 is an enlarged side cross-sectional view of a rotating shaft structure of the hermetic compressor according to the present invention.

Figure 3 is a perspective view showing an enlarged perspective view of the rotating shaft structure of the hermetic compressor according to the present invention.

Figure 4 is a plan sectional view showing the branch flow path side shaft structure in the hermetic compressor according to the present invention.

Figure 5 is a side cross-sectional view showing another embodiment of the branch passage in the hermetic compressor according to the present invention.

Figure 6 is a side cross-sectional view showing another embodiment of the branch passage in the hermetic compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

11: frame 11a: hollow part

11a-1: Bearing mounting groove 20: Rotating shaft

21: main shaft portion 22: eccentric shaft portion

23: weight balance part 30: thrust bearing

31: Upper thrust washer 32: Lower thrust washer

33: ball 50: oil euro

51: the first oil euro 52: the second oil euro

53: third oil euro 54,54 ′, 54 ″: branch euro

The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor provided so that the axial load of the rotating shaft is supported rolling through the thrust bearing.

In general, the hermetic compressor is a device for compressing and supplying a fluid such as a refrigerant, which is employed in a refrigeration cycle such as an air conditioner or a refrigerator, and includes a hermetic container that forms an exterior, and performs a compression operation of the refrigerant in the hermetic container. And a drive unit for providing the compression power of the refrigerant.

The compression unit and the driving unit are respectively provided on the upper and lower sides of the frame. The compression unit includes a cylinder provided with an inner space on the upper side of the frame to form a compression chamber, and a piston for linearly reciprocating and compressing a refrigerant in the compression chamber. The drive unit includes a stator fixed to the lower part of the frame, and a rotor provided inside the stator to rotate by electrical interaction with the stator.

And the frame is provided with a rotation shaft for transmitting the driving force of the drive unit to the compression unit, this rotation shaft is inserted to be rotatable in the hollow formed on the center side of the frame.

Here, the lower end of the rotating shaft extends to the lower portion of the hollow part to be press-fitted to the rotor so that the rotating shaft can be rotated together with the rotor, and the upper end of the rotating shaft forming an eccentrically eccentric part is connected through the piston and the connecting rod. The rotational motion of the rotating shaft is converted into a linear reciprocating motion of the piston.

In addition, a thrust bearing including a ball disposed between the upper and lower thrust washers and the upper and lower thrust washers, which are provided in a ring shape so as to support the axial load of the rotating shaft, outside the rotary shaft between the eccentric portion of the rotary shaft and the frame. And, in the frame of the upper hollow portion is formed a bearing installation groove provided in a ring shape such that the thrust bearing is installed.

Through this structure, when the rotating shaft rotates due to the electrical interaction between the stator and the rotor, the piston connected to the eccentric portion of the rotating shaft through the connecting rod linearly reciprocates in the compression chamber and compresses the refrigerant. The axial load of the time axis of rotation is rolling supported by the thrust bearing.

In addition, a conventional compressor is provided with an oil supply structure for lubricating and cooling the oil by supplying oil to various friction parts of the rotating shaft and the compression part during the refrigerant compression action.

That is, an oil storage space for storing a predetermined oil is formed at the bottom of the sealed container, and oil pick-up means for sucking oil in the oil storage space is provided at the lower end of the rotary shaft, and an oil pick-up means is provided at the rotary shaft. The oil flow path for guiding the oil sucked into the rotary shaft and the hollow portion and toward the compression portion is formed.

The oil flow path communicates with the first oil flow path formed inside the rotating shaft under the hollow part and the first flow path to lubricate the rotating shaft and the hollow part, and is provided in the form of a spiral groove on the outer surface of the rotating shaft side of the hollow part under the thrust bearing. And a third oil passage communicating with the second oil passage and extending through the interior of the rotating shaft to an upper end of the rotating shaft.

Therefore, when the rotating shaft rotates during the compression of the refrigerant, the oil in the oil storage space first passes through the first oil passage through the oil passage and passes through the second oil passage, thereby lubricating and cooling between the rotating shaft and the hollow of the frame. The oil that has passed through the two oil passages is continuously sprayed through the third oil passage to the upper end of the rotating shaft to be delivered to the compression part to lubricate and cool the connecting portions of the piston and the connecting rod, and the oil is recovered to the oil storage space and then The lubrication and cooling actions are supplied to the friction part of the rotating shaft and the compression part again through the oil channel.

However, in the conventional hermetic compressor having such an oil supply structure, the oil supply to the thrust bearing side which substantially supports the load of the rotating shaft while the oil supply between the hollow part and the rotary shaft of the thrust bearing lower side or the compression shaft side is smoothed is more or less. When the compressor is used for a long time, the upper and lower thrust washers and balls constituting the thrust bearing are worn out, making it difficult to rotate the rotating shaft smoothly, or the wear dust generated at this time is seated on the thrust bearing, There was a problem in reducing the overall reliability of the compressor, such as not to properly exhibit the friction reduction effect.

The present invention is to solve such a problem, an object of the present invention is to provide a hermetic compressor provided to improve the overall reliability of the product by improving the lubrication structure of the thrust bearing side provided to support the axial load of the rotating shaft. .

The present invention for achieving the above object is provided in an airtight container in which the oil storage space is formed on the bottom frame having a hollow; A rotating shaft rotatably installed on the frame so as to penetrate the hollow part and having an oil flow path guiding oil of the oil storage space upwardly; In the hermetic compressor including a thrust bearing installed in the bearing installation groove of the hollow part upper end and provided to support the rotation axis in the axial direction, the oil flow path is characterized in that it is provided to supply oil directly to the thrust bearing side. .

And the rotating shaft is a lower main shaft portion extending downward through the hollow portion; And an eccentric portion including an eccentric shaft portion formed at an upper end to be eccentric with the main shaft portion, and a weight balance portion provided between the eccentric shaft portion and the main shaft portion to compensate for rotational imbalance due to the eccentric shaft portion. A first oil flow path provided inside the main shaft portion of the lower portion of the hollow portion, a second oil flow path formed on the outer surface of the main shaft portion of the hollow portion of the lower portion of the thrust bearing so as to communicate with the first oil flow passage, and the thrust bearing side of the A third oil flow path provided inside the main shaft portion and the eccentric portion, and a portion of the oil guided to the third oil flow path to the thrust bearing side to be branched from the third oil flow path to the outside of the thrust bearing side main shaft portion. It characterized in that it comprises a branch passage provided to pass through.

In addition, the branch flow path is formed in the form of a straight hole, the third oil flow path is provided to be eccentric from the shaft center of the main shaft portion, the branch flow path and the straight line connecting the shaft center and the third oil flow path of the main shaft portion; It is characterized in that the branched in the crossing direction.

In addition, the branch flow path is characterized in that the inclined so that the height of the outlet of the outer surface side of the main shaft portion is formed higher than the inlet of the third oil channel side.

In addition, the branch flow path is characterized in that the tapered so as to narrow the diameter from the inlet to the outlet side of the main shaft portion from the inlet side of the third oil passage.

In addition, the branch flow path is formed in a straight hole shape, the third oil flow path is provided to be eccentric from the axial center of the main shaft portion, the branch flow path is characterized in that formed through the punching process on the outer surface side of the main shaft portion.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the hermetic compressor according to the present invention, as shown in FIG. 1, the overall structure is formed through the hermetic container 10 formed by combining the upper container 10a and the lower container 10b with each other.

One side and the other side of the sealed container 10 are provided with a suction pipe 11a for the introduction of external refrigerant and a discharge tube 11b for discharging the refrigerant compressed in the sealed container 10 to the outside, respectively. 10) Compression units for compressing the refrigerant and driving units for providing the compression power of the refrigerant are respectively provided on the upper and lower portions of the frame 11 installed therein.

The dual drive unit includes a stator 12 fixed to the outside to generate a predetermined electromagnetic force according to the application of a current, and a rotor 13 provided inside the stator 12 to rotate by electrical interaction with the stator 12. And a compression unit integrally formed with the frame 11 on one side of the frame 11 and having a compression block 14a formed therein, and a linear reciprocating motion inside the compression chamber 14a. The cylinder head is coupled to one side of the cylinder block 14 to seal the piston 15 and the compression chamber 14a to compress the refrigerant, and the refrigerant discharge chamber 16a and the refrigerant suction chamber 16b are partitioned. 16 and a refrigerant interposed between the cylinder block 14 and the cylinder head 16 to be sucked into the compression chamber 14a from the refrigerant suction chamber 16b or discharged from the compression chamber 14a to the refrigerant discharge chamber 16a. It is configured to include a valve device 17 to control the flow of.

In addition, a hollow portion 11a is formed at the center side of the frame 11, and the hollow shaft 11a is rotatably supported by a rotation shaft 20 for transmitting the driving force to the compression portion.

Referring to FIG. 2 together, the rotating shaft 20 is supported so that the upper part is rotatable to the hollow part 11a of the frame 11 and the lower part is pressed into the center of the driving part rotor 13 so that the rotating shaft 20 is rotated. The lower main shaft portion 21 to be rotated together with the electron 13 and the eccentric shaft portion 22 eccentrically provided from the main shaft portion 21 on the upper portion of the main shaft portion 21 so as to form an upper end of the rotating shaft 20. And a weight balance portion 23 provided between the eccentric shaft portion 22 and the main shaft portion 21 to compensate for the rotational imbalance caused by the eccentric shaft portion 22, wherein the eccentric shaft portion 22 is a weight balance portion. A connecting rod 18 for forming an eccentric portion together with the eccentric shaft portion 22 and the piston 15 of the compression portion for converting the rotational movement of the rotary shaft 20 into a linear reciprocating movement of the piston 15. Is connected to allow the piston 15 to linearly reciprocate in the compression chamber 14a.

In addition, upper and lower thrust washers 31 and 32 provided in a ring shape on the outer side of the upper end of the main shaft portion 21 between the eccentric portion of the rotating shaft 20 and the frame 11 to support the axial load of the rotating shaft 20. ), And a thrust bearing 30 including a ball 33 interposed between the upper and lower thrust washers 31 and 32, and the thrust bearing 30 is provided on the frame 11 of the upper portion of the hollow portion 11a. ) Is provided with a bearing installation groove (11a-1) provided in a ring shape.

In this configuration, when the rotating shaft 20 is rotated together with the rotor 13 by the electrical interaction between the stator 12 and the rotor 13 according to the application of power, the eccentric shaft portion of the rotating shaft 20 ( 22 and the piston 15 connected through the connecting rod 18 is a linear reciprocating motion in the compression chamber (14a), through the suction pipe (11a) and the refrigerant suction chamber (16b) through the compression chamber (14a) The refrigerant introduced into is compressed in the compression chamber 14a and supplied to the outside of the sealed container 10 through the refrigerant discharge chamber 16a and the discharge pipe 11b, wherein the axial load of the rotating shaft 20 is The bearing is rolled through the thrust bearing 30.

On the other hand, the hermetic compressor according to the present invention is provided with an oil supply structure for performing a lubrication and cooling action by supplying oil to the friction portion of the rotating shaft 20 and the compression part and the thrust bearing 30 side during the refrigerant compression action. The detailed structure is as follows.

First, an oil storage space 19 for storing a predetermined oil is formed at the bottom of the sealed container 10, and oil pick-up means for sucking up the oil in the oil storage space 19 to the upper end of the rotating shaft 20 ( 40) is installed.

The oil pick-up means 40 has a cylindrical oil pick-up member 41 formed at both ends of the oil pick-up member 41 so that the ends thereof are immersed in the oil storage space 19, and the oil pick-up member 41 is installed to rotate the rotary shaft 20. When the oil in the oil storage space 19 is pumped up to the upper portion is configured to include an oil pick-up wing 42, the rotating shaft 20 is the oil picked up by the oil pick-up means 40 An oil passage 50 for guiding the rotating shaft 20 and the compression portion as well as the thrust bearing 30 is formed.

The oil passage 50 is a first oil passage 51 formed inside the main shaft portion 21 under the hollow portion 11a, and the first passage so as to lubricate between the main shaft portion 21 and the hollow portion 11a. The second oil channel 52 and the second oil channel 52 which communicate with the 51 and are provided in the form of a spiral groove on the outer surface of the main shaft portion 21 on the hollow part 11a side of the lower part of the thrust bearing 30. And a third oil flow passage 53 extending from the main shaft portion 21 at the upper end side of the second flow passage 52 to the upper end of the eccentric shaft portion 22 through the inside of the rotating shaft 20 and the thrust bearing 30 side. It includes a branch passage 54 in the form of a straight hole branched from the third oil passage 53 to the outer surface of the main shaft portion 21 so as to communicate with the outside of the main shaft portion 21.

In addition, between the upper end of the first oil channel 51 and the lower end of the second oil channel 52, and between the upper end of the second oil channel 52 and the lower end of the third oil channel 53 to communicate therebetween. The first communication hole 55a and the second communication hole 55b are respectively formed, and the first flow path 51 has a main side at the upper side so that the oil can be raised more effectively under centrifugal force when the rotation shaft 20 rotates. It is formed to be inclined toward the eccentric portion toward the upper side so as to be eccentric from the shaft center C of the shaft portion 21, and the third flow path 53 is also eccentrically formed from the shaft center C of the main shaft portion 21 toward the eccentric portion. .

Here, the branch oil passage 54 branched from the third oil passage 53 eccentric from the shaft center of the main shaft portion 21 has the third oil passage 53 proximate to the outer surface of the main shaft portion 21. On the outer surface side of the shaft portion 21 can also be formed through a simple punching process.

When the rotating shaft 20 rotates during the compression action of the refrigerant through the oil supply structure, the oil in the oil storage space 19 is first sucked upward through the pumping force of the oil pick-up means 40, and the oil thus absorbed is First, while passing through the first oil passage 51 and the second oil passage 52, lubrication and cooling between the main shaft portion 21 on the lower side of the thrust bearing 30 and the hollow portion 11a of the frame 11, Some of the oil that has passed through the second oil passage 52 continues to be injected to the upper side of the eccentric shaft portion 22 through the third oil passage 53 to the compression part side, so that the piston 15 and the connecting rod 18 Lubricating and cooling the connection, etc., the remaining part of the oil delivered to the third oil flow path 53 is delivered directly to the thrust bearing 30 side through the branch flow path 54 to lubricate and the trust bearing 30 side. Cooled.

Therefore, the hermetic compressor according to the present invention is provided such that the oil guided upward along the oil flow path 50 is directly delivered to the thrust bearing 30, so that the compressor constituting the thrust bearing 30 even if the compressor is used for a long time. The wear of the lower thrust washers 31 and 32 and the ball 33 is greatly suppressed, so that the smooth rotation of the rotating shaft 20 through the thrust bearing 30 is continuously possible, and the upper and lower thrust washers 31 and 32 are used. Even when the ball 33 is somewhat worn and a small amount of dust is generated, the dust can be removed without being seated on the thrust bearing 30 by oil transferred directly to the thrust bearing 30, so that the dust caused by the wear dust The reduction of the rotational force of the bearing 30 is suppressed.

In this way, the oil flowing out through the upper end of the branch passage 54 or the third oil passage 53 is recovered to the oil storage space 19 by its own weight and then rotates along the oil passage 50 again. ) And the compression unit and the thrust bearing 30 are supplied to repeat the lubrication and cooling operation.

On the other hand, in order to increase the amount of oil supplied to the thrust bearing 30 through the branch flow path 54, the branch flow path 54 is formed so that the centrifugal force is formed in the direction in which the centrifugal force is maximized when the rotation shaft 20 rotates. The flow path 54 must branch from the third oil oil 53 in a direction opposite to the direction of the axis C of the main shaft portion 21.

In this case, however, the amount of oil supplied through the branch passage 54 becomes too large and most of the oil guided from the second oil passage 52 to the third oil passage 53 passes through the branch passage 54. It may be supplied only to the thrust bearing 30 side and may not be delivered to the third oil passage 53 on the upper side of the branch passage 54. In this case, the oil supply is delivered to the compression part through the upper end of the third oil passage 53. This is not smooth, and there is a fear that lubrication and cooling of the compression section will be difficult.

Therefore, the branch flow passage 54 branches at least in a direction intersecting a straight line connecting the shaft center C of the main shaft portion 21 and the third oil flow passage 53 to have a great influence on the oil supply to the compression portion. It is preferable to be provided so that the oil can be delivered directly to the thrust bearing 30 side.

In addition, even if the branch passage 54 branches in a direction intersecting a straight line connecting the shaft center C of the main shaft portion 21 and the third oil passage 53, the branching direction of the branch passage 54 is the main shaft portion ( If it is somewhat closer to the direction opposite to the axis (C) of 21), it will not be able to effectively prevent the phenomenon that the oil supply is concentrated to the branch flow path 54 side, on the contrary, the branching direction of the branch flow path 54 is In the case where the shaft portion 21 is formed in the direction of the axis C, since the oil supply itself through the branch flow passage 54 may become difficult, the branching direction of the branch flow passage 54 branched from the third flow passage 54 is illustrated in FIG. 3. As shown in FIG. 4, it is more preferably formed in a direction approximately opposite to the direction of the axis C of the main shaft portion 21 and the direction of the axis C of the main shaft portion 21.

In addition, even in the state in which the oil supply is concentrated on the branch flow path 54 side, the oil once delivered to the branch flow path 54 may be effectively transferred to the thrust bearing 30 side. It is more advantageous to improve the lubrication of the side.

Thus, as shown in FIG. 5, which shows another embodiment, the branch passage 54 ′ may be tapered to apply Bernoulli's principle of increasing the speed of the fluid when passing through the narrow passage.

That is, when the branch flow path 54 'is formed to be narrower in diameter from the inlet of the third oil flow path 53 to the outlet of the outer surface side of the main shaft portion 21, the flow velocity of the oil at the outlet side of the branch flow path 54'. This is increased, and oil supply to the thrust bearing 30 side becomes smoother.

And as shown in Figure 6 showing another embodiment, when the branch flow path (54 ") is formed to be inclined so that the height of the outlet is higher than the inlet, the oil guided upward along the third oil flow path 53 is the branch flow path It is possible to reduce the flow resistance of the oil flowing along the branch flow path 54 ″ while preventing sharp bending during the inflow into the (54 ″).

As described above in detail, in the hermetic compressor according to the present invention, the oil guided upward along the oil flow path formed on the rotating shaft can be directly transmitted to the thrust bearing side supporting the axial load of the rotating shaft. As a result of the significant improvement, the smooth rotation of the rotating shaft through the thrust bearing is possible continuously for a long time, which has the advantage of improving the overall reliability of the hermetic compressor.

Claims (6)

delete delete It is provided inside an airtight container in which an oil storage space is formed at the bottom. A frame having a hollow portion; A rotating shaft rotatably installed on the frame so as to penetrate the hollow part and having an oil flow path guiding oil of the oil storage space upwardly; In the hermetic compressor comprising a thrust bearing installed in the bearing installation groove of the upper end of the hollow portion provided to support the rotation axis in the axial direction, The oil flow path is provided to supply oil directly to the thrust bearing side,  The rotating shaft has a lower main shaft portion extending downward through the hollow portion; And an eccentric portion including an eccentric shaft portion formed at an upper end to be eccentric with the main shaft portion, and a weight balance portion provided between the eccentric shaft portion and the main shaft portion to compensate for rotational imbalance due to the eccentric shaft portion. The oil flow path is provided with a first oil flow path provided inside the main shaft portion of the lower portion of the hollow portion, and a second oil flow path formed on the outer surface of the main shaft portion of the hollow portion of the lower portion of the thrust bearing so as to communicate with the first oil flow passage; The thrust bearing side is branched from the third oil passage so as to transfer a portion of the third oil passage provided in the main shaft portion and the eccentric portion and the oil guided to the third oil passage to the thrust bearing side. It includes a branch passage provided to communicate with the outside of the main shaft portion, The branch flow path is formed in a straight hole shape, and the third oil flow path is provided to be eccentric from the axial center of the main shaft part, and the branch flow path crosses a straight line connecting the axial center of the main shaft part and the third oil flow path. Hermetic compressor, characterized in that branched in the direction. The method of claim 3, The branched flow passage is inclined so that the height of the outlet of the outer surface side of the main shaft portion is formed higher than the inlet of the third oil flow path side. The method of claim 3, The branched flow passage is tapered so that the diameter is narrowed toward the exit from the inlet side of the main shaft portion from the inlet side of the third oil passage. It is provided inside an airtight container in which an oil storage space is formed at the bottom. A frame having a hollow portion; A rotating shaft rotatably installed on the frame so as to penetrate the hollow part and having an oil flow path guiding oil of the oil storage space upwardly; In the hermetic compressor comprising a thrust bearing installed in the bearing installation groove of the upper end of the hollow portion provided to support the rotation axis in the axial direction, The oil flow path is provided to supply oil directly to the thrust bearing side,  The rotating shaft has a lower main shaft portion extending downward through the hollow portion; And an eccentric portion including an eccentric shaft portion formed at an upper end to be eccentric with the main shaft portion, and a weight balance portion provided between the eccentric shaft portion and the main shaft portion to compensate for rotational imbalance due to the eccentric shaft portion. The oil flow path is provided with a first oil flow path provided inside the main shaft portion of the lower portion of the hollow portion, and a second oil flow path formed on the outer surface of the main shaft portion of the hollow portion of the lower portion of the thrust bearing so as to communicate with the first oil flow passage; The thrust bearing side is branched from the third oil passage so as to transfer a portion of the third oil passage provided in the main shaft portion and the eccentric portion and the oil guided to the third oil passage to the thrust bearing side. It includes a branch passage provided to communicate with the outside of the main shaft portion, The branched flow path is formed in the form of a straight hole, the third oil flow path is provided to be eccentric from the axial center of the main shaft portion, the branched flow path characterized in that formed through the punching process on the outer surface side of the main shaft portion.

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