KR20060080441A - A reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor, and an object of the present invention is to provide a reciprocating compressor provided to improve the lubrication structure of the piston side connecting rod.

To this end, the present invention and the rotating shaft formed eccentric; A compression chamber provided at one side of the rotation shaft; A piston installed inside the compression chamber to enable a straight reciprocating motion; A first through hole is formed at one end so as to be rotatably coupled to the outer surface of the eccentric part so as to convert the rotational force of the rotary shaft into a linear reciprocating motion, and the other end inserted into the piston is fastened to the piston. In the reciprocating compressor comprising: a second through hole is formed so as to be rotatably fitted to the outer surface of the piston pin, the connecting rod formed therein an oil flow path for communicating between the first through hole and the second through hole; An intersecting flow passage is formed inside the connecting rod which is positioned inside the piston so as to be adjacent to the through hole and intersects with the oil flow passage so as to pass through the connecting rod.

Description

Reciprocating Compressor {A RECIPROCATING COMPRESSOR}

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

2 is a side cross-sectional view of an enlarged connecting rod side in the compressor according to the present invention, illustrating the connecting rod side lubrication structure.

3 is a perspective view showing the structure of the connecting rod in the compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

4: bearing 5: oil storage

6: oil pick-up member 11a: compression chamber

12: piston 12a: piston pin

12b: Locking pin 12c: Oil groove

30: axis of rotation 31: eccentric part

32: oil guiding route 33: oil guiding groove

34: oil guide 40: connecting rod

41: first through hole 42: second through hole

43: oil euro 44: oil discharge hole

45: crossover

The present invention relates to a reciprocating compressor, and more particularly, to a reciprocating compressor provided to improve the lubrication structure of the piston side connecting rod.

In general, a reciprocating compressor employed in a refrigerating cycle such as a refrigerator or an air conditioner is provided to compress the refrigerant in the compression chamber through a piston reciprocating linearly in the compression chamber. A connecting rod is installed between the pistons to convert the rotational movement of the rotating shaft into a linear reciprocating motion and transmit it to the pistons.

A first through hole is formed at one end of the connecting rod so as to be rotatably coupled to the outer surface of the eccentric portion, and the other end of the connecting rod inserted into the piston is rotatably fitted to an outer surface of the piston pin fastened to the piston. Two through holes are formed. When one end of the first through-hole connecting rod is eccentrically rotated when the rotating shaft rotates, the piston coupled to the other end of the second through-hole connecting rod linearly reciprocates and the refrigerant in the compression chamber is rotated. To be compressed.

An oil guiding flow path is formed inside the rotating shaft to guide oil stored at the bottom of the compressor container to an upper portion. 1 An oil guide hole for lubricating between the inner circumferential surface of the through hole is formed.                         

In addition, the first rod and the second through-hole inside the connecting rod so that the oil supplied between the eccentric portion and the inner circumferential surface of the first through hole can be continuously supplied between the inner circumferential surface of the second through hole and the piston pin of the connecting rod. An oil flow path for communicating the through-hole and the second through-hole is formed, and at the end of the connecting rod side of the second insertion hole located on the opposite side of the oil flow path, oil between the inner circumferential surface of the second through-hole and the piston pin is connected to the outside of the rod. An oil discharge hole is formed to discharge into the piston.

Therefore, when the rotating shaft rotates through this structure, the oil stored at the bottom of the container by the centrifugal force of the rotating shaft is guided to the top along the oil guide flow path, some of the oil guided to the oil guide flow path to the eccentric oil guide hole It is transmitted between the eccentric portion and the inner circumferential surface of the first through-hole of the connecting rod to perform lubrication therebetween, and the oil passed between the inner circumferential surface of the first through-hole and the eccentric rotational axis continues through the oil passage. It is delivered to the through hole and lubricated between the inner circumferential surface of the second through hole and the piston pin, and then discharged into the piston through the oil discharge hole. The lubricated oil is recovered to the bottom of the container by its own weight and then again It is fed into the oil guiding channel and repeats lubrication.

On the other hand, in the conventional reciprocating compressor, the piston-side connecting rod is a portion to which the compressive force of the piston is directly transmitted, so that friction noise and abrasion are severely generated as compared with other portions, and thus a smoother lubrication action is required.

However, since the conventional reciprocating compressor has a structure in which oil is supplied to the side of the second through hole only through a single path such as the oil passage, there is a limit to improving the lubrication action between the inner circumferential surface of the second through hole and the piston pin. There have been many difficulties in improving the lubricating action of the piston-side connecting rod, such as lubrication between the upper and lower surfaces of the second through-hole connecting rod located inside the piston and the inner surface of the piston.

The present invention is to solve such a problem, an object of the present invention is to provide a reciprocating compressor provided to improve the lubrication structure of the piston-side connecting rod.

In order to achieve the above object, the present invention is a rotation shaft formed with an eccentric; A compression chamber provided at one side of the rotation shaft; A piston installed inside the compression chamber to enable a straight reciprocating motion; A first through hole is formed at one end so as to be rotatably coupled to the outer surface of the eccentric part so as to convert the rotational force of the rotary shaft into a linear reciprocating motion, and the other end inserted into the piston is fastened to the piston. In the reciprocating compressor comprising: a second through hole is formed so as to be rotatably fitted to the outer surface of the piston pin, the connecting rod formed therein an oil flow path for communicating between the first through hole and the second through hole; An intersecting flow passage formed to intersect the oil passage and penetrate the connecting rod is provided inside the connecting rod positioned inside the piston to be adjacent to the through hole.                     

In addition, the cross flow path is characterized in that it is provided in the vertical direction.

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

As shown in FIG. 1, the reciprocating compressor according to the present invention has an airtight container 1 formed by combining an upper container 1a and a lower container 1b, and is provided in the sealed container 1. Compressing unit 10, the compression of the refrigerant is carried out, a driving unit 20 for providing a compression power according to the compression of the refrigerant, and a rotating shaft 30 connecting the drive unit and the compression unit to transfer the driving force of the drive unit to the compression unit and On one side and the other side of the sealed container 1, a suction pipe 2 for guiding external refrigerant into the sealed container 1 and a discharge tube for discharging the refrigerant compressed by the compression unit 10 to the outside of the sealed container 1 (3) is provided.

The dual drive unit 20 provides a driving force of the compressor, and is fixed to the upper side of the sealed container 1, and is spaced apart from the stator 21 to be electromagnetically separated from the stator 21. With a rotating rotor 22. Here, the upper end of the rotating shaft 30 is pressed into the center of the rotor 22 is provided to rotate with the rotor 22, the lower portion of the rotating shaft 30 is rotatably supported through the bearing (4).

And the compression unit 10 is installed on the lower side of the rotating shaft 30 and the cylinder block 11 formed with a compression chamber (11a) to compress the refrigerant, and the linear reciprocating motion in the compression chamber (11a) to compress the refrigerant A cylinder head 13 coupled to one side of the cylinder block 11 so as to seal the compression chamber 11a, and the refrigerant suction chamber 13a and the refrigerant discharge chamber 13b partitioned with each other; It is provided between the cylinder block 11 and the cylinder head 13, the flow of the refrigerant is sucked into the compression chamber (11a) from the refrigerant suction chamber (13a) or discharged from the compression chamber (11a) to the refrigerant discharge chamber (13b) It consists of the valve apparatus 14 for interrupting.

In addition, an eccentric part 31 provided to eccentrically rotate is formed at a lower end of the lower rotating shaft 30 of the bearing 4, and the eccentric rotation of the eccentric part 31 is linearly formed between the eccentric part 31 and the piston 12. Connecting rod 40 is provided to be converted to the movement is connected.

As shown in FIGS. 2 and 3, the connecting rod 40 has a first through hole 41 formed to rotatably couple the eccentric portion 31 to one end thereof, and the other end of the connecting rod 40. A second through hole 42 having an inner diameter smaller than the first through hole 41 is formed, and an end of the connecting rod 40 on the side of the second through hole 42 is connected to the piston 12. The second through hole 42 is inserted into the piston 12 so as to be rotatably coupled to 12a. Here, the first and second through holes 41 and 42 are formed in the vertical direction, respectively, and the connecting rod 40 at the side of the first through hole 41 when the rotating shaft 30 is rotated through the connecting rod 40. When one end of the eccentric rotation of the piston 12 coupled to the other end of the connecting rod 40 of the second through-hole 42 is linear reciprocating movement to allow the refrigerant in the compression chamber (11a) to be compressed. For reference, reference numeral 12b is a locking pin for fixing the piston pin 12a to the piston 12.

Therefore, the reciprocating compressor configured as described above has a connecting rod 40 when the rotating shaft 30 is rotated together with the rotor 22 by the electrical interaction between the stator 21 and the rotor 22 according to power application. Piston 12 connected to the eccentric portion (31) through a linear reciprocating motion inside the compression chamber (11a), through which the refrigerant outside the sealed container (1) cylinder head (13) from the suction pipe (2) After flowing into the refrigerant suction chamber 13a of the refrigerant, it is delivered to the compression chamber 11a and compressed in the compression chamber 11a, and the refrigerant compressed in the compression chamber 11a is again discharged from the refrigerant in the cylinder head 13. After the discharge to the chamber 13b is discharged to the outside of the sealed container 1 through the discharge pipe (3), this process is repeated and the compression of the refrigerant through the compressor is performed.

Meanwhile, various friction sliding parts in the sealed container 1, that is, between the rotary shaft 30 and the bearing 4, the eccentric portion 31 of the rotary shaft 30 and the first through hole 41 of the connecting rod 40. Abrasion occurs between the inner circumferential surface and the inner circumferential surface of the second through hole 42 of the connecting rod 40 and the piston pin 12a together with the high temperature caused by friction when the compressor is driven. The reciprocating compressor has such friction sliding part. It has a lubrication structure for the purpose of lubrication.

That is, the oil storage space 5 is formed at the bottom of the sealed container 1 so that a predetermined amount of oil is stored, and the oil guide for guiding the oil of the oil storage space 5 to the top inside the rotating shaft 30. A flow path 32 is formed, an oil guide groove 33 communicating with the oil guide flow path 32 is formed on an outer surface of the rotating shaft 30 on the bearing 4 side, and an oil guide flow path is formed in the eccentric portion 31. An oil guide hole 34 for supplying the oil of 32 to the eccentric portion 31 outer surface is formed. In addition, a cylindrical oil pick-up member 6 is installed at the lower end of the rotating shaft 30 to communicate the oil storage space 5 and the oil supply passage 32.

Therefore, when the rotary shaft 30 is rotated when the compressor is driven, the oil in the oil storage space 5 is rotated through the oil pickup member 6 and the oil guide channel 32 by the centrifugal force of the rotary shaft 30. Some of the oil guided to the upper part of the upper part is supplied between the bearing 4 and the rotating shaft 30 through the oil guide groove 33, and some oil is supplied through the oil guide hole 34. It is supplied between the inner circumferential surface of the first through hole 41 and the eccentric portion 31 of the connecting rod 40 to perform lubrication of these parts.

In addition, the oil supplied between the inner circumferential surface of the first through hole 41 and the eccentric portion 31 continues to lubricate between the inner circumferential surface of the second through hole 42 and the piston pin 12a. (42) It is transmitted to the inner circumferential side, for this purpose within the connecting rod 40 between the first through hole 41 and the second through hole 42, the first through hole 41 and the second through hole 42 The oil passage 43 for communicating therebetween is provided, and an oil groove 12c is formed along the circumferential direction on the outer surface of the piston pin 12a on the side of the second through hole 42 so that the inner circumferential surface of the second through hole 42 is formed. Allow a sufficient amount of oil to flow in between the piston pin 12a. In addition, the oil discharge hole for discharging the oil of the oil groove 12c into the piston 12 at the end of the connecting rod 40 on the side of the second insertion hole 42 located on the opposite side of the oil passage 43 ( 44) is formed.

In addition, the cross flow passage is formed in the connecting rod 40 of the portion which is located inside the piston 12 adjacent to the second insertion hole 42 side in the vertical direction and intersects with the oil flow passage 43. A 45 is formed, and the cross flow passage 45 is provided to penetrate the connecting rod 40 in a state where the cross flow passage 45 crosses the oil flow passage 43.

The configuration of the cross flow passage 45 is that the supply of oil delivered from the first through hole 41 side to the second through hole 42 side is also made through the cross flow passage 45 together with the oil flow passage 43. This is to improve the lubrication of the piston 12 side connecting rod 40 to which the compression force of the piston 12 is directly transmitted.                     

That is, as shown in FIG. 2, in the state where the cross flow passage 45 is formed, when the oil is supplied to the oil flow passage 43, the cross flow passage 45 communicates with and crosses the oil flow passage 43. Oil is also supplied to the side, and the oil flowing through the cross flow passage 45 to the upper and lower surfaces of the connecting rod 40 on the second insertion hole 42 is delivered to the second through hole 42 adjacent thereto. The oil of the flow path 43 is transferred between the inner circumferential surface of the second insertion hole 42 and the piston pin 12a, thereby improving lubrication between the inner circumferential surface of the second insertion hole 42 and the piston pin 12a. .

In this case, the second insertion hole 42 is connected by the oil flowing in the second through hole 42 along the upper and lower surfaces of the connecting rod 40 from the cross passage 45. Smooth lubrication can be performed between the upper and lower surfaces of the rod 40 and the inner wall surface of the piston 12 corresponding thereto.

Therefore, the reciprocating compressor according to the present invention is connected between the inner circumferential surface of the second through hole 42 and the piston pin 12a of the connecting rod 40 through the cross flow passage 45 as well as the second through hole 42 side connecting rod. Since the lubrication between the upper and lower surfaces of the 40 and the inner wall surface of the piston 12 corresponding thereto becomes smoother, the lubrication of the connecting rod 40 on the piston 12 side can be improved as a whole.

As described above in detail, in the reciprocating compressor according to the present invention, the supply of oil transferred from the first through hole side to the second through hole side through the cross passage is also made through the cross passage along with the oil passage. The upper surface of the connecting rod and the second through-hole connecting rod by the oil flowing between the inner circumferential surface of the second through-hole and the piston pin becomes more active and flows from the cross flow passage to the second through-hole. The lubrication action between the lower surface and the corresponding piston inner wall surface can also be made smoothly, so that the lubrication action of the piston side connecting rod can be greatly improved.

Claims (2)

A rotating shaft formed with an eccentric portion; A compression chamber provided at one side of the rotation shaft; A piston installed inside the compression chamber to enable a straight reciprocating motion; A first through hole is formed at one end so as to be rotatably coupled to the outer surface of the eccentric part so as to convert the rotational force of the rotary shaft into a linear reciprocating motion, and the other end inserted into the piston is fastened to the piston. In the reciprocating compressor including a second through-hole is formed so as to be rotatably fitted to the outer surface of the piston pin, the connecting rod formed therein an oil passage for communicating between the first through-hole and the second through-hole. And a crossing passage formed to intersect the oil passage and penetrate the connecting rod in the connecting rod positioned inside the piston to be adjacent to the second through hole. The method of claim 1, The crossover passage is a reciprocating compressor, characterized in that provided in the vertical direction.

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