KR20070120859A - A hermetic type compressor - Google Patents

Abstract

A hermetic type compressor is provided to prevent abrasion at a sliding part caused by foreign matters by contraction of outer diameter at the end of a fitted part of an oil pickup member when the outer diameter is fitted into a fitting hole, which prevents scratch of inner wall of the fitting hole forming burrs. A hermetic type compressor comprises a driving unit, a compression unit, and a rotary shaft(40). The driving unit provides compression driving force of refrigerant into a hermetic vessel defined with an oil storing space on the bottom side. The compression unit is driven by the driving unit to perform compression of the refrigerant. The rotary shaft transfers driving force of the driving unit to the compression unit. The rotary shaft comprises an oil path(42) to guide oil in the oil storing space to the compression unit and a sliding part of the driving unit, and a fitting hole(43) provided on a lower end of the rotary shaft for insertion of a cylindrical oil pickup member(60) which picks up oil in the oil storing space to the oil path. A contraction of an outer diameter at the end of a fitting part(61) of the oil pickup member occurs when the end portion of the fitting part is inserted into the fitting hole.

Description

Hermetic Compressor {A HERMETIC TYPE COMPRESSOR}

1 is a cross-sectional view showing a structure of an oil pick-up member of a conventional hermetic compressor, showing an oil pick-up member separated from a rotating shaft.

FIG. 2 is an enlarged cross-sectional view illustrating a structure of a press-in hole of the oil pick-up member and a rotation shaft of the oil pick-up member when the oil pick-up member of FIG.

Figure 3 is a side cross-sectional view showing the overall structure of a hermetic compressor according to an embodiment of the present invention.

Figure 4 is a perspective view showing the structure of the oil pick-up member in the hermetic compressor according to an embodiment of the present invention.

Figure 5 is a side cross-sectional view showing a coupling structure of the oil pickup member in the hermetic compressor according to an embodiment of the present invention.

FIG. 6 is a cross-sectional plan view illustrating a state in which the oil press member is press-fitted with the press-fitting part of the rotary shaft in the hermetic compressor according to the exemplary embodiment of the present invention.

7 is a perspective view showing the structure of an oil pick-up member according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

40: rotating shaft 42: oil euro

43: press-in hole 60: oil pick-up member

61: indentation 61a: incision

The present invention relates to a hermetic compressor, and more particularly, to a hermetic compressor provided to improve the lubrication action of the sliding part by improving the coupling structure of the oil pick-up member pressed into the rotating shaft.

In general, a hermetic compressor employed in a refrigeration cycle such as a refrigerator or an air conditioner forms an appearance through a hermetically sealed container having an oil storage space formed on a bottom thereof.

The inside of the sealed container is provided with a driving unit for providing a compression driving force of the refrigerant, and a compression unit for receiving the driving force of the driving unit to perform the compression action of the refrigerant, the driving force of the drive unit is transmitted to the compression unit through the rotating shaft.

Meanwhile, in the process of driving the driving unit to compress the refrigerant by the compression unit, oil of the oil storage space is supplied to the sliding unit of the driving unit and the compression unit to suppress excessive frictional action. An oil flow path for supplying the oil in the space to the sliding unit of the drive unit and the compression unit is formed, and at the lower end of the rotation shaft extending toward the oil storage space, the oil in the oil storage space is picked up by the centrifugal force according to the rotation of the rotation shaft. The tubular oil pick-up member for coupling is combined.

1 and 2, the conventional oil pick-up member 1 is usually press-fitted to the lower end of the rotary shaft 2, and coupled to the lower end of the rotary shaft 2 for the coupling of the oil pick-up member 1 above. The press-in hole 2b formed to communicate with the oil passage 2a is processed. Therefore, the tubular oil pick-up member 1 is firmly fastened to the rotation shaft 2 by forcibly pressing the upper press-in portion 1a into the press-in hole 2b.

However, in the process of forcibly pressing the press-in portion 1a of the oil pick-up member 1 into the press-in hole 2b as shown in FIG. 2, the inner wall of the press-in hole 2b is formed in the oil pick-up member 1. As the end of the press-in part 1a is scratched, a burr 2c may be formed at the end of the press-in hole 2b in the press-in direction toward the oil pick-up member 1, and such a bur 2c may As it is used for a long time, foreign substances are formed while being separated from the inner wall of the press-in hole 2b by oil hydraulic pressure. In addition, the foreign matter flows along with the oil passage 2a along with the oil and is transferred to the sliding portions of the driving unit and the compression unit to wear the sliding portion and prevent the smooth lubrication of the sliding portion.

The present invention is to solve such a problem, it is an object of the present invention to provide a hermetic compressor provided to improve the lubricating action of the sliding part by improving the coupling structure of the oil pick-up member pressed into the rotating shaft.

The hermetic compressor according to the present invention for achieving the above object is a drive unit for providing a compression driving force of the refrigerant inside the sealed container in which the oil storage space is formed on the bottom surface, and receives the driving force of the drive unit to perform the compression action of the refrigerant. And a rotation shaft provided to transmit the driving force of the driving unit to the compression unit, wherein the rotation shaft has an oil flow path for guiding oil in the oil storage space to the sliding unit of the compression unit and the driving unit. The lower end of the rotary shaft is formed with a press-hole for press-fitting the tubular oil pick-up member for picking up the oil in the oil storage space into the oil passage, the end of the press-in portion of the oil pick-up member press-fitted into the press-in hole It is characterized in that the outer diameter is provided to shrink in the process of being pressed into the press-in hole.

And it is characterized in that the incision is provided at the end of the indentation.

In addition, the incision is characterized in that it is provided with a plurality of spaced apart from each other along the circumferential direction.

In addition, the incision is characterized in that it is provided to be spaced apart from each other at equal intervals.

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

As shown in FIG. 3, the hermetic compressor according to the present invention has a hermetic container 10 formed by combining an upper container 10a and a lower container 10b, and a refrigerant to be provided inside the hermetic container 10. Compression unit 20 to perform the compression of the drive unit 30 to provide a compression driving force in accordance with the compression of the refrigerant, and the driving unit 30 to transfer the driving force of the drive unit 30 to the compression unit 20 And a rotation shaft 40 connecting the compression unit 20.

The dual drive unit 30 is to provide a driving force of the compressor, and the stator 31 is fixed to the upper side of the sealed container 10, and the stator 31 and the electromagnetic stator 31 is spaced apart from the inside of the stator 31 It has a rotor 32 to interact with. Here, the upper end of the rotating shaft 40 is pressed into the center of the rotor 32 is provided to rotate with the rotor 32, the lower portion of the rotating shaft 40 is rotatably supported through the journal bearing 50. .

And the compression unit 20 is installed on the lower side of the rotating shaft 40, the cylinder block 21 is formed with a compression chamber 21a to compress the refrigerant, and the linear reciprocating motion in the compression chamber 21a to compress the refrigerant A cylinder head 23 coupled to one side of the cylinder block 21 to seal the piston 22 and the compression chamber 21a, and the refrigerant suction chamber 23a and the refrigerant discharge chamber 23b are partitioned; It is provided between the cylinder block 21 and the cylinder head 23 and intercepts the flow of the refrigerant sucked into the compression chamber 21a from the refrigerant suction chamber 23a or discharged from the compression chamber 21a to the refrigerant discharge chamber 23b. It consists of a valve device 24 for doing so.

In addition, an eccentric part 41 is formed at the lower end of the lower side of the journal bearing 50 in the rotational shaft 40, and an eccentric rotation of the eccentric part 41 is performed between the eccentric part 41 and the piston 22. The connecting rod 25 is provided to be converted into a linear motion is connected.

The hermetic compressor configured as described above is connected to the connecting rod 25 when the rotating shaft 40 rotates together with the rotor 32 by the electrical interaction between the stator 31 and the rotor 32 according to power application. Piston 22 connected to the eccentric portion 41 through a linear reciprocating motion inside the compression chamber 21a, through which the refrigerant 22 enters the refrigerant suction chamber 23a of the cylinder head 23 from the outside of the sealed container 10 The refrigerant is transferred to the compression chamber 21a and compressed inside the compression chamber 21a. The refrigerant compressed in the compression chamber 21a is discharged back to the refrigerant discharge chamber 23b of the cylinder head 23 and then sealed. Discharged to the outside of the container 10, this process is repeated and the compression of the refrigerant through the compressor is performed.

Meanwhile, various friction sliding parts in the sealed container 10, that is, between the rotating shaft 40 and the journal bearing 50, or between the connecting rod 25 and the piston 22, together with high heat due to friction when the compressor is driven. Wear occurs, but the hermetic compressor has a lubrication structure for the purpose of lubrication and cooling of the friction sliding part.

In detail, an oil storage space 11 is formed at a bottom of the sealed container 10 so that a predetermined amount of oil is stored, and an oil flow path for guiding oil in the oil storage space to the sliding part is formed on the rotating shaft 40. 42 is formed, the lower end of the eccentric portion 41, the tubular oil pick-up member 60 for drawing up the oil in the oil storage space 11 into the oil passage 42 by centrifugal force during rotation of the rotating shaft. Is inclined so as to form a predetermined angle.

The oil passage 42 is an oil hole 42a formed inside the eccentric portion 41 and an oil provided to take a spiral shape on the outer circumference of the rotating shaft 40 toward the journal bearing 50 so as to communicate with the oil hole 42a. It is configured to include a groove (42b), the lower end of the rotary shaft 40 is formed in the press hole (43) formed so as to press the upper portion of the oil pick-up member 60 is in communication with the oil hole (42b).

Therefore, when centrifugal force is generated while the rotary shaft 40 rotates to perform a compression action of the refrigerant, the oil in the oil storage space 11 is sucked upward through the oil pick-up member 60 and sucked upward. Silver is delivered to each of the sliding portions along the oil passage 42 to perform lubrication and cooling.

Meanwhile, as shown in FIG. 4, the upper portion of the oil pick-up member 60 forms an indentation portion 61 having an outer diameter that is press-fitted into the indentation hole 43, and the oil pick-up member 60 is such an indentation portion. While being forced into the press-in hole 43 through the (61) to warn the rotating shaft 40, the inner wall of the press-in hole 43 in the process of forcing the press-in portion 61 to the press-in hole 43 As the end of the press-in portion 61 is scratched, a burr may be formed at the end of the press-in hole 43 in the press-in direction of the oil pick-up member 60. In addition, as the compressor is used for a long time, foreign substances are formed while being separated from the inner wall of the press-in hole 43 by oil hydraulic pressure, and the foreign substances thus formed flow along the oil passage 42 along with the oil, and then the sliding part. It is transmitted to the wearer, as well as to prevent the smooth lubrication of the sliding part.

Therefore, in the press-in portion 61 of the oil pick-up member 60 according to the present embodiment, a cutout 61a is provided at the end of the press-in portion 61 in the press-in direction of the oil pick-up member 60. The cutout 61a allows the outer diameter of the end of the indentation 61 to be contracted while the indentation 61 is press-fitted into the indentation hole 43.

When the outer diameter of the end of the press-in part 61 press-fitted into the press-in hole 43 is contracted in the process of press-fitting into the press-in hole 42, the inner wall of the press-in hole 43 is formed at the end of the press-in part 61. Since it is prevented from being scratched, burrs are not formed on the inner wall of the end portion of the press-in side of the press-in side of the press-in part 61, and thus, foreign matters are naturally prevented from being formed due to burr formation. When it is reduced, the wear of the sliding part is reduced, as well as the lubrication of the sliding part by oil is more effective.

In addition, the cut-out portion 61a formed at the end of the press-in portion 61 in the press-in direction is formed in a plurality of spaced apart from each other along the circumferential direction, wherein each cut-out portion 61a is spaced apart from each other at equal intervals. It is preferable that the end of the 61 be provided to be evenly contracted.

Next, in the hermetic compressor according to the present embodiment configured as described above, the process of the oil pick-up member 60 being pressed into the press-in hole 43 of the rotating shaft 40 and the effects thereof will be described.

First, as shown in Figure 4, the outer diameter of the indentation portion 61 in the state before the indentation portion of the oil pick-up member is coupled to the indentation hole of the rotary shaft is the size that can be formed between the indentation hole and the inner diameter of the indentation hole 43 The outer diameter of the indentation portion 61 maintains the same size throughout the entire longitudinal direction of the indentation portion 61.

In this state, the oil pick-up member 60 is coupled to the rotating shaft 40 as shown in FIG. 5 by press-fitting the press-in part 61 into the press-in hole 43. As shown in FIG. 6, the end portion of the press-in direction 61 of the press-in portion 61a formed therein is pressurized by the inner diameter of the press-in hole 43 between the cut-out portions 61a and is retracted inward to reduce the outer diameter. The indentation portion 61 under the cutout portion 61a is forcibly pressed into the indentation hole 43 while maintaining the original outer diameter size so that the oil pick-up member 60 is firmly coupled to the rotation shaft 40.

At this time, the end of the press-in portion 61 in which the cut-out portion 61a is formed does not scratch the inner wall of the press-in hole 43 while the outer diameter is reduced, so that the end inner wall of the press-in side 43 in the press-in direction toward the press-in portion 61. Burr is not formed in the. In addition, when the burr is prevented from being formed on the inner wall of the press-in hole 43, the generation of foreign matters due to the burr formation is also naturally prevented. The hermetic compressor having the oil pick-up member reduces the wear phenomenon of the sliding part due to the foreign matters. Lubrication of the sliding part by the oil can be more effectively performed.

In addition, as shown in Figure 7, in the other embodiment of the present invention, the end of the press-up portion (61 ') of the oil pick-up member (60') is bent in the bending bent inward of the oil pick-up member (60 ') 61′a) is formed, and the bending portion 61′a is provided in plural numbers spaced apart from each other at equal intervals along the circumferential direction like the cutout portion 61a. In the case of the end portion of the press-fitting portion 61 ′ including the bending portion 61 ′ a, the bending portion 61 is pressed when the inner wall of the press-hole 43 is pressed in the process of being pressed into the press-hole 43. Since the diameter shrinks as the width of ´a) decreases, the same effect as that of the first embodiment is achieved.

As described above in detail, the hermetic compressor according to the present invention is provided so that the outer diameter of the end portion of the press-fit portion of the oil pick-up member press-fitted into the press-in hole of the rotary shaft is contracted in the press-in hole. Therefore, the hermetic compressor according to the present invention prevents burrs from being formed on the inner wall of the indentation hole while the inner wall of the indentation hole is scratched at the end of the indentation part. Is prevented, of course, it is possible to perform the lubrication of the sliding part by the oil more effectively.

Claims (4)

A driving unit providing a compression driving force of the refrigerant in an airtight container having an oil storage space formed at a bottom thereof, a compression unit receiving the driving force of the driving unit to compress the refrigerant, and a driving force of the driving unit to the compression unit. In the hermetic compressor provided with a rotating shaft provided to deliver to, The rotating shaft is formed with an oil flow path for guiding the oil of the oil storage space to the sliding unit of the compression unit and the drive unit, the lower end of the rotating shaft tubular shape for picking up the oil of the oil storage space into the oil flow path Indentation hole is formed so that the oil pickup member of the press-fit, An end of the press-in portion of the oil pick-up member press-fitted into the press-in hole is characterized in that the outer diameter is contracted in the process of press-in the press-in hole. The method of claim 1, Hermetic compressor, characterized in that the incision is provided at the end of the indentation. The method of claim 2, The cut-off compressor is characterized in that a plurality of spaced apart from each other along the circumferential direction. The method of claim 3, wherein Hermetic compressor, characterized in that provided between the cut portions are spaced apart from each other at the same interval.

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