KR20070070635A - Scroll compreser - Google Patents

Abstract

A scroll compressor is provided to separate a thrust bearing surface of an upper frame from a key groove of an orbiting scroll during orbiting motion of the orbiting scroll for securing a bearing surface, thereby stabilizing behavior of the orbiting scroll and reducing noise. A scroll compressor includes an orbiting scroll(60) formed with an elongated Oldham ring key groove(65) in the tangential direction with respect to a thrust bearing surface at a side of the thrust bearing surface for smooth oil supply to the Oldham key groove. An upper frame(40) supports the orbiting scroll. An Oldham ring(50) is positioned between the orbiting scroll and the upper frame for preventing rotation of the orbiting scroll.

Description

Scroll Compressor {Scroll compreser}

1 is a vertical sectional view of a scroll compressor according to the present invention.

2 is a plan view illustrating a process of compressing the refrigerant in the compression unit of the scroll compressor according to the present invention.

3 is an exploded perspective view showing an upper frame, an all-damping ring, and a scrolling scroll of the scroll compressor according to the present invention.

4 is a longitudinal sectional view showing a turning scroll according to the present invention.

Figure 5 is a longitudinal cross-sectional view showing an Oldham ring in accordance with the present invention.

              <Description of reference numerals for main parts of the drawings>

61: Turning Scroll Lab 64: Hard Plate

65: upper key groove 62: slewing scroll thrust bearing face

63: boss 66: curve

The present invention relates to a compressor, and more particularly, to a scroll compressor which secures stable behavior of a swing scroll and reduces noise caused by the same, and reduces wear and tear by supplying a smooth oil to an upper key formed on the swing scroll.

In general, a compressor is a mechanical device that compresses gas to increase pressure, and is classified into a displacement compressor, a dynamic compressor, and a scroll compressor. Displacement type compressors are typical piston compressors and are widely used for supplying compressed air for factories. The capacity is as small as a compressor in a domestic refrigerator, but is usually 50 to 25,000 m3 per hour, and the pressure can be up to 3,500 atm. This compressor consists of a cycle which inhales, compresses, and discharges air according to the reciprocating motion of the piston in the cylinder and the opening and closing of the valve. This type is commonly used when high pressures are required rather than flow rates, and dynamic compressors rotate the rotor at very high speeds, due to the large flow rates obtained. It is a device that raises the pressure of gas by momentum. It is often used when a large flow rate is required. Typically, industrial dynamic compressors are up to 300,000 m3 per hour at maximum flow rates, and the pressure can be increased up to 350 atm.

In particular, scroll compressors that compress the gas between two spiral grooves by rotation are widely used as compressors for air conditioners and refrigerators. Such a scroll compressor is divided into a low pressure scroll compressor or a high pressure scroll compressor depending on whether suction gas is filled or discharge gas is filled in the casing.

In detail, a conventional low pressure scroll compressor includes a drive motor including a rotor and a stator, a drive unit including a drive shaft which rotates together as the drive motor rotates, and an eccentric portion is formed at an upper portion thereof, and which is fitted above the drive shaft. An upper frame and a suction pipe for introducing a fluid from the outside are included.

In addition, a rotating scroll which is located on the upper side of the upper frame formed with a thrust bearing surface on the upper surface, and compresses the refrigerant sucked through the suction pipe by the swinging movement, a fixed scroll fixed to the upper side of the upper frame in engagement with the swinging scroll And an old dam ring for allowing the pivoting scroll to pivot within the fixed scroll, and a discharge tube through which the refrigerant compressed in the fixed scroll is discharged to the outside.

In detail, the Oldham ring includes a ring-shaped body, a lower key protruding downward in the normal direction of the ring on the upper surface of the body, and a lower key protruding downward in the normal direction of the ring on the lower surface of the body. And corresponding to the upper key, the lower surface of the turning scroll is formed with an upper key groove vertically recessed in the normal direction of the turning scroll. A lower key groove is formed on one side of the thrust bearing surface in a vertical direction with respect to the outer circumferential surface of the thrust bearing surface to be recessed.

The compression operation of the scroll compressor by the above-described configuration will be briefly described.

First, a low pressure fluid, which has undergone expansion, is introduced through a suction pipe, and the introduced refrigerant is moved to the scroll compression unit. The fluid thus moved is compressed into a fluid at a high temperature and high pressure in the scroll compression unit and discharged to the outside of the compressor through the discharge pipe.

On the other hand, during the compression process, the all-damping is interposed on the upper surface of the turning scroll and the upper frame to prevent the turning scroll from rotating.

However, the pivoting scroll is pivoted by the upper / lower key grooves formed in the normal direction with respect to the outer circumference of the pivoting scroll thrust bearing surface and the thrust bearing surface of the upper frame and the upper / lower keys of the Oldham ring. In this case, the upper frame thrust bearing face is located in the upper key groove. The thrust bearing face of the upper frame is thus located in the upper key groove, thereby reducing the bearing area. This loss of bearing area causes sudden pressure fluctuations in the scroll compression part, resulting in incomplete movement of the swinging scroll and noise caused by such incomplete behavior.

The key groove and the upper / lower keys may not be smoothly supplied to the upper / lower key grooves formed in a normal direction with respect to the outer circumference of the turning scroll thrust bearing surface and the thrust bearing surface of the upper frame. There is a problem that wear and noise occurs due to increased friction.

The present invention has been proposed to solve the above problems, to improve the discontinuous pressure fluctuations caused by the loss of the bearing area caused by the swinging movement (orbital movement) of the swinging scroll, to ensure the stable behavior of the swinging scroll and noise It is an object of the present invention to provide an all-damping mounting structure of a scroll compressor that reduces the pressure.

Still another object of the present invention is to provide a smooth oil supply to the upper key groove formed on the lower surface of the swing scroll to reduce friction between the upper key groove and the upper key, to reduce the occurrence of wear and noise of the scroll compressor It is an object to provide a ring mounting structure.

The Oldham ring mounting structure of the scroll compressor according to the present invention for achieving the object as described above, the thrust bearing surface is formed on the lower surface, the long-old Oldham ring key groove tangential to the thrust bearing surface on one side of the thrust bearing surface Formed scrolling scroll; And an upper frame supporting the pivoting scroll; an old dam ring interposed between the pivoting scroll and the upper frame to prevent rotation of the pivoting scroll.

By the scroll compressor according to the present invention, when the swinging scroll is pivoting, the upper frame thrust bearing surface is positioned away from the upper key groove. Since the thrust bearing surface of the upper frame is spaced apart from the upper key groove, the bearing area is secured. Such a bearing surface is secured, and the behavior of the swing scroll is stabilized, and noise is reduced.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of the present invention and other degenerate inventions can be easily added by adding, changing, or deleting other elements. I can suggest.

1 is a vertical sectional view of a scroll compressor according to the present invention.

Referring to FIG. 1, the scroll compressor 1 according to the present invention may be broadly classified into a casing 10 forming an external appearance of the scroll compressor, a driving unit for generating rotational force, a suction unit for sucking fluid from the outside, and A scroll compression unit for compressing the fluid sucked from the suction unit and a discharge unit for discharging the high pressure fluid compressed by the scroll compression unit.

In detail, the driving unit is formed in a substantially central portion of the inside of the casing 10 by a drive motor 20 including a stator 21 and a rotor 22 positioned inside the stator 21. Then, the drive shaft 23 is axially pushed into the center of the rotor 22 is formed on the center of the drive motor. When the driving shaft 23 is supplied with power to the driving unit, the driving shaft 23 transmits the rotational force generated by the rotor 22 to the turning scroll 60 and the oil pump 90 which will be described later.

In addition, the suction part includes a suction pipe 30 formed on one side of the outer circumferential surface of the casing 10, and a suction chamber 31 in communication with the suction pipe 30 and storing the introduced fluid.

In addition, the scroll compression unit surrounds the outer circumferential surface of the drive shaft 23, the upper side of the upper frame 40 is formed with a lower key groove to be described later, the thrust bearing surface is formed on the central portion, and the upper frame ( A key that is engaged with the lower key groove formed in the 40 is formed, and the old dam ring 50 performing a linear reciprocating motion on the upper frame 40 and an upper key described later on the upper side of the old dam ring 50. Combined with, the rotating scroll 60, the spiral scroll wrap 61 is formed, and fixed to the upper diaphragm 80 and the casing 10 of the compressor located on the upper side of the rotating scroll 60 Scroll 70 is included. In detail, the scroll compression unit is formed in a spiral shape on a lower side of the fixed scroll 70 in a spiral shape, and is formed in a spiral shape on an upper side of the pivoting scroll 60, and the fixed scroll wrap 71 is formed. The rotating scroll wrap 41 is inserted 180 degrees with respect to the and the inner end of the fixed scroll wrap 71 includes a discharge port 75.

2 is a plan view illustrating a process of compressing a refrigerant in the compression unit of the scroll compressor according to the present invention.

The operation of the scroll compression unit constituting the above configuration will be described with reference to FIG. 2, and the pivoting scroll 60 is eccentric with respect to the drive shaft 23 to pivot (idle). Then, as the orbiting scroll 60 is pivoted by the rotation of the drive shaft 23 with respect to the fixed scroll 70, the pockets 99 are formed to cause surface contact between the respective wraps 61 and 71 to compress the refrigerant. do. The formed pocket 76 returns to the center of the scroll wrap, whereby the volume decreases, and as the volume decreases, a high pressure is formed, and the formed high pressure fluid is discharged through the discharge port 76 in the center of the scroll member. It is moved to 72.

In addition, the discharge portion is formed in the center portion of the fixed scroll 70 discharge port 75 for discharging the compressed refrigerant, and the discharge port 72 is communicated with the discharge port 75, the discharge chamber 72 is formed on the uppermost side of the compressor And a discharge tube 73 formed on one side of the discharge chamber 72.

In the discharge unit, a check is fixed between the discharge port 75 and the discharge chamber 72 to prevent the reverse flow of the refrigerant discharged through the discharge port 75. The valve 76 and the check valve housing 77 may be formed.

In addition, the oil pump 90 is composed of an internal gear pump and an inner gear 92 and an outer gear 91. Since the oil pump 90 is inserted into the insertion hole formed in the lower frame 93, the pump cover 94 serving as the lower cover of the oil pump 90 is fastened to the lower frame 93. Therefore, it is mounted in the insertion hole. In detail, the oil pump 90 is in the state where oil is sucked into the chamber 83 formed between the mermaid gear 92 and the outer gear 91, and when the driving shaft 23 is rotated, the inner gear 92 ), The outer gear 82 is rotated with the rotation. As the inner gear 92 and the outer gear 91 are rotated, the oil in the chamber rises along the oil supply passage 74. This oil penetrates the lubricating scroll thrust bearing face 62 and the upper frame thrust bearing face 42.

Hereinafter, the operation of the scroll compressor according to the present invention will be described.

First, when a drive motor composed of the stator 21 and the rotor 22 is operated, the drive shaft 23 coupled with the rotor 22 of the drive motor rotates. As the drive shaft 23 rotates, the refrigerant is sucked through the suction pipe, and the refrigerant in the low pressure state introduced into the compressor through the suction pipe 30 communicates with the suction pipe 30. Then enter the scroll compression section.

In addition, the refrigerant moved to the scroll compression unit is compressed to high pressure by the swinging motion of the swing scroll 60, and the compressed refrigerant is collected at the center portion of the scroll. The collected high pressure refrigerant is discharged to the discharge chamber 72 through the discharge port 75. Here, the check valve 77 and the check valve housing 76 are formed to prevent the high pressure refrigerant discharged into the discharge chamber 72 from being flowed back to the scroll compression unit, thereby preventing the back flow. Finally, the refrigerant accumulated in the discharge chamber 72 is discharged to the outside of the compressor through the discharge tube 73.

3 is an exploded perspective view showing an upper frame, an Oldham ring, and a scrolling scroll of the scroll compressor according to the present invention.

Referring to FIG. 3, the upper frame 40 has an upper frame thrust bearing surface 41 formed on an upper surface of the frame body 42. In addition, a boss insertion groove 43 having a predetermined inner diameter and a depth is formed at the center of the upper frame thrust bearing surface 41 to insert the boss 63 of the swing scroll. In addition, a driving shaft insertion hole 44 into which the driving shaft 23 is inserted is formed at the center of the boss insertion groove 43. The lower key groove 45 of the Oldham ring 50 having a predetermined depth and a predetermined width is opposite to each other in a tangential direction of the upper frame thrust bearing surface 41 on one side of the upper frame 40. Is formed. More specifically, the lower key groove 45 is formed so that the Oldham ring lower key, which will be described later, can reciprocate in the tangential direction of the upper frame thrust bearing face 41.

4 is a longitudinal sectional view showing a turning scroll according to the present invention.

Referring to FIG. 4, the swing scroll 60 according to the present invention includes a hard plate 64 having a predetermined thickness and area, a swing scroll wrap 61 formed on an upper surface of the hard plate 64, and the hard plate 64. Is formed on the lower surface of the rotating frame thrust bearing surface 62 facing the upper frame thrust bearing surface 41 of the upper frame 40 and the rotating scroll thrust bearing surface 62. The boss 63 inserted into the boss insertion groove 43 and the swing scroll thrust bearing surface 62 are formed in a tangential direction on the outside of the swing scroll thrust bearing surface 62, An upper key groove 65 into which the upper key 52 is inserted is included.

In detail, the boss 63 of the swing scroll 60 is inserted into the boss insertion groove 43, and the pivot scroll thrust bearing face 62 is coupled to face the thrust bearing face 41 of the upper frame. The drive shaft 23 is inserted into the drive shaft hole 44 of the upper frame, and the eccentric portion 24 of the drive shaft is inserted into the boss 63 of the turning scroll. The swing scroll 60 performs a fluid compression process by the interaction between the rotational force transmitted from the drive shaft and the fixed scroll 70.

On the other hand, an upper key groove 65 is formed outside the lower surface of the swing scroll 60 in the tangential direction of the swing scroll thrust bearing surface and into which the upper key 52 of the Oldham ring 50 is inserted.

In detail, the upper key groove 65 is formed to have a predetermined depth and width upward from the lower surface of the hard plate 64 in the tangential direction of the pivoting scroll thrust bearing surface 62. The upper key groove 65 formed in the tangential direction reinforces the outer side of the turning scroll thrust bearing surface 62. The upper key groove 65 reduces the anxiety caused by the pressure fluctuation when the turning scroll 60 performs the turning movement.

The upper key groove 65 is formed along a curved curve 66 having a predetermined curvature at an edge portion formed toward the center of the pivoting scroll 60. Through this curved edge portion, the oil flowing through the pivoting scroll thrust bearing surface 62 is smoothly introduced into the upper key groove 65. The upper key groove 65 reduces wear and tear of the upper key groove 65 and the upper key 52 to be described later, and reduces noise caused by friction.

5 is a longitudinal sectional view showing an Oldham ring in accordance with the present invention.

5, the Oldham ring 50 according to the present invention has a ring-shaped body whose longitudinal section has a rectangular longitudinal section.

In detail, a block-shaped upper key 52 is formed on the upper surface of the body 53 in the tangential direction of the ring. In other words, a surface having a large area of the block is formed in the tangential direction of the ring. The upper key 52 is inserted into the upper key groove 65, and when the turning scroll 60 is a pivoting movement, the upper key 52 is reciprocating sliding movement. And the upper key 52 is preferably formed with two opposite to the body.

In addition, a lower key 51 in the form of a block is formed on the lower surface of the body 53 in the tangential direction of the ring. In other words, a surface having a large area of the block is formed in the tangential direction of the ring. The lower key 51 is inserted into the lower key groove 45, so that when the swinging scroll 60 is pivoting, the lower key 51 is reciprocally sliding. And the lower key 51 is preferably formed two opposite to the center.

On the other hand, it is noted that the intersection angle of the line segment connecting the two upper keys 52 and the line segment connecting the two lower keys 51 is preferably 90 °.

Hereinafter, the operation of the scroll compressor by the above configuration will be described.

Operation of the scroll compressor 1, first, power is applied to the driving unit to operate as the rotor 22 of the driving unit rotates to generate a rotational force. This rotational force is transmitted to the pivoting scroll 60 through the drive shaft 23 pressed into the rotor 22. The rotational scroll 60, which has received the rotational force, is prevented from rotating by the Oldham ring 50, and the pivoting scroll wrap 61 is engaged with the fixed scroll wrap 71 to make a pivoting motion. And the fluid sucked through the suction pipe 30 by the swinging movement of the swinging scroll 70, through the suction port (not shown in the figure) formed on one side of the fixed scroll 70, the fixed scroll wrap 71 ) Is sucked between the rotating scroll wrap (61) and, while being moved to the center portion and compressed at the same time, the fluid is in a high temperature and high pressure fluid discharged through the discharge port 75 formed in the fixed scroll 70, the discharge It is discharged through the tube 96.

In addition, as the drive shaft 23 rotates, oil filled in the oil storage part 12 of the casing 10 is pumped by the oil pump 90 to form the oil supply passage formed in the drive shaft 23. Rise through 95. The oil thus raised is filled in the boss insertion groove 43 and flows into the oil groove 46 of the upper frame and is supplied to the swing scroll thrust bearing face 54 and the upper frame thrust bearing face 41. In detail, oil supplied to the pivoting scroll thrust bearing face 54 and the upper frame thrust bearing face 42 lubricates the pivoting scroll thrust bearing face 54 and the upper frame thrust bearing face 41. After the lubrication is completed, the oil is returned to the oil storage part 12.

On the other hand, the pivoting scroll 60 is a pivoting motion on the upper surface of the upper frame (40). During this pivoting movement, the outer side of the pivoting scroll bearing surface 62 is interviewed with the upper frame thrust bearing surface 41 of the upper frame 40, and thus the high pressure generated at the upper portion of the pivoting scroll 60. It is also supported by. In addition, since the inner edge of the turning scroll 62 is bent to a predetermined curvature, oil is smoothly supplied to the upper key groove 52, thereby reducing wear and noise.

 By the scroll compressor according to the present invention as described above, when the swinging scroll is pivoting, the upper frame thrust bearing surface is positioned away from the upper key groove. Since the thrust bearing surface of the upper frame is spaced apart from the upper key groove, the bearing area is secured. Such a bearing surface is secured, and the behavior of the swing scroll is stabilized, and noise is reduced.

Moreover, by the scroll compressor which concerns on this invention, it forms in the tangential direction with respect to the outer periphery of the said rotating scroll thrust bearing surface and the thrust bearing surface of the said upper press. Therefore, the oil is smoothly supplied to the upper / lower key grooves, thereby reducing friction between the key grooves and the upper / lower keys, thereby reducing wear and tear and reducing noise.

Claims (4)

A pivoting scroll including an upper key groove formed in a tangential direction on a lower surface edge portion thereof; An Oldham ring interposed on the lower side of the pivoting scroll and including an upper key protruding from an upper surface and inserted into the upper key groove; And an upper frame on which the Oldham ring and the swinging scroll are seated. The method of claim 1, And a lower key protruding in a tangential direction from a lower surface of the Oldham ring, and a key groove for inserting the lower key into an upper surface of the upper frame. The method of claim 2, And at least one of the upper key groove and the lower key groove is a long groove. The method of claim 1, The upper key groove is a scroll compressor, characterized in that the inner edge portion in contact with the upper surface of the Oldham ring is curved with a predetermined curvature.

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