KR20050028214A - Scroll compressor including rotation preventing apparatus - Google Patents

Abstract

A scroll compressor in a revolution-preventing structure is provided to reduce a weight of a ring by forming the ring with a section in the shape of "H", and reduce a load applied to key parts of the ring for preventing the wear of the key parts, thereby preventing abnormal noise or vibration caused by the wear of the key parts. A scroll compressor in a revolution-preventing structure includes an upper frame(80) for supporting an upper part of a driving shaft, a fixed scroll fixed to the upper frame, and an orbiting scroll(40) for carrying out orbiting between the fixed scroll and the upper frame to realize compression of fluid. A ring(30) has an approximately circular main body(33). The main body has at least one or more upper keys(31) formed to the main body to be inserted to a side of the orbiting scroll, one or more lower keys(32) formed to the main body to be inserted to a side of the upper frame, and grooves(34) formed between the upper and lower keys.

Description

Scroll compressor including rotation preventing apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a scroll compressor including an old dam ring for reducing the load acting on the key portion of an old ham ring for preventing rotation of the swinging scroll and maintaining rigidity. will be.

Generally, a scroll compressor performs compression through the relative movement of a fixed scroll composed of a spiral scroll wrap and fixed regardless of the rotation of the drive shaft, and a turning scroll revolving in accordance with the rotation of the drive shaft.

The swing scroll is pivoted in the fixed scroll by the rotation of the drive shaft mounted in the scroll compressor.

In detail, the fixed scroll and the pivoting scroll member are interfitted with one of the scroll wraps being rotated 180 degrees from the other wrap and being displaced. Then, the swivel scroll member is swiveled by the rotation of the drive shaft relative to the fixed scroll, whereby each lap is brought into surface contact to form a crescent-shaped pocket. The formed pockets return to the center of the scroll wrap, whereby the volume is reduced to form a high pressure, and the high pressure fluid is moved to the discharge chamber through the discharge port at the center of the scroll member.

Hereinafter, the configuration and operation of a conventional scroll compressor and a process of making a high-pressure refrigerant will be described, and a problem existing in the conventional scroll compressor will be described.

1 is a cross-sectional view of a conventional general scroll compressor.

Referring to FIG. 1, a general scroll compressor includes a driving unit including a driving shaft 1 that is rotated as the driving motor rotates when power is applied to the compressor, and an upper frame that is inserted above the driving shaft to support the driving shaft ( 12), a suction part including a suction pipe 10 and a suction chamber 11 to allow fluid to be introduced from the outside, and an upper side of the upper frame 12 to compress the refrigerant sucked through the suction pipe 10. A pivoting scroll 3 supported by the pivoting scroll, a stationary scroll 4 engaged with the pivoting scroll 3 fixed above the upper frame 12, and the pivoting scroll 3 being pivoted within the stationary scroll 4 A scroll compression unit including an old dam ring (2), a discharge port (5) vertically penetrating the central portion of the fixed scroll (4), and a space formed on a top surface of the compressor, and the discharge port (5) Sat in communication with Chamber 6 is provided on one side of the discharge chamber it includes additional discharge is a discharge pipe (7) is formed for the outflow of accumulated refrigerant.

The operation of the conventional scroll compressor presented is described.

First, the low pressure refrigerant introduced through the suction pipe 10 enters the scroll compression unit through the suction chamber 11. The refrigerant entering the scroll compression section is compressed to high pressure by the swinging movement of the swinging scroll 3 between the fixed scroll 4 and the swinging scroll 3. Then, the refrigerant compressed to high pressure is moved to the discharge chamber 6 through the discharge port 5 formed perpendicular to the center portion of the fixed scroll (4). Then, the high pressure refrigerant accumulated in the discharge chamber 6 finally escapes through the discharge tube 7.

2 is a perspective view of a conventional Oldham ring.

Referring to Figure 2, a conventional general Oldham ring is projected in a vertically rising direction from the circumferential surface on the upper circumferential surface of the ring, the upper key 13 and the shape facing each other on the lower circumferential surface of the Oldham ring A lower key 14 protruding from the circumferential surface in a vertically descending direction and facing each other and a body 15 of the ring are included.

In detail, the ring body portion 15 of the portion where the upper key 13 is formed is formed in a straight line, and the ring body portion 15 of the portion where the lower key 14 is formed is the curved surface of the old dam ring 2. It is formed along. In addition, the upper key 13 is engaged with two key grooves (not shown) formed on the bottom of the turning scroll 3, the lower key 14 is two key grooves (not shown) formed on the upper frame 12 Is bound).

The action of the Oldham ring 2 and the revolving scroll 3 will be described.

The pivoting scroll 3 is linearly reciprocated in the horizontal direction along the shape of the upper key 13 when the driving shaft 1 is rotated while being coupled with the upper key 13. Further, the old dam ring 2 is a linear reciprocating motion in the vertical direction on the thrust surface along the shape of the key groove (not shown) formed in the upper frame 12, while the swivel scroll 3 is linear reciprocating motion in the horizontal direction. Will be As a result, the turning scroll 3 does not rotate but only an orbital movement despite the rotation of the drive shaft 1.

Here, since the swinging scroll 3 is an orbital motion, the upper key 13 of the old dam ring 2 is frictional with the key groove of the swinging scroll 3, and a load is applied to the upper key 13. It will work.

In addition, the lower key 14 of the old dam ring 2 is applied to the key groove of the upper frame 12 and frictional force, the lower key 14 is applied to the load, the upper key 13 and the lower key 14 Bending stress acts on the body part 15 of the old dam ring 2 by the two loads applied to it.

The body portion 15 of the conventional Oldham Ring as described above has a rectangular cross section, and a member having such a cross section is inferior in ability to withstand bending stress.

In addition, the load transmitted to the key portion of the old dam ring causes abrasion of the key, and due to the occurrence of the abrasion caused, the anti-rotation function of the swing scroll cannot be effectively performed. If such wear continues, the engagement between the keyway on the lower surface of the swinging scroll 3 and the key on the upper surface of the Oldham ring 2 will be loosened so that the swinging scroll 3 will not revolve along the intended track. In this case, the surface contact between the turning scroll wrap 8 and the fixed scroll wrap 9 is also loosened. If the surface contact of both scroll wraps (8) and (9) is loose, the compression capacity is reduced, and if the coupling of the key groove and the key is loose, the noise and vibration increase when the compressor is operated.

The present invention has been proposed to solve such a problem, and an object of the present invention is to propose a scroll compressor which reduces the wear of the key part by reducing the variation of the key load by the method of reducing the weight of the Oldham ring.

In addition, an object of the present invention is to propose a scroll compressor that can increase the rigidity even under the same load, thereby increasing the operational stability of the compressor.

The present invention has been proposed to solve the above problems, the scroll compressor according to the present invention includes an upper frame for supporting the upper side of the drive shaft; A fixed scroll fixed to the upper frame; A pivoting scroll which performs compression of the fluid while pivoting between the fixed scroll and the upper frame; An approximately circular body portion, one or more keys formed in the body portion to be inserted into one side of the pivoting scroll, one or more keys formed in the body portion and inserted into one side of the upper frame, and the body portion It characterized in that configured to include; Oldham ring containing a groove formed to be recessed in.

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 in the scope of the present invention or other inventions which are further deteriorated by the addition, change, deletion, etc. of other components can be easily made. I can suggest.

3 is a vertical cross-sectional view illustrating a portion of a scroll compressor according to the spirit of the present invention.

Referring to FIG. 3, the scroll compressor according to the present invention may be classified into a driving unit generating rotational force, a suction unit for sucking fluid from the outside, a scroll compression unit for compressing the fluid sucked from the suction unit, and The discharge part which discharges the high pressure fluid compressed by the scroll compression part is included.

In detail, the drive unit includes a stator 21 and a drive motor formed of a rotor 22 positioned inside the stator 21, and a drive shaft 20 inserted and rotated on the center of the drive motor.

In addition, the suction part includes a suction pipe 70 formed on one side of the compressor outer circumferential surface, and a suction chamber 71 in communication with the suction pipe 70 and accumulating the introduced refrigerant.

In addition, the scroll compression unit surrounds the outer circumferential surface of the drive shaft 20, the upper frame 80 is formed with a key groove on one side of the upper surface, and a thrust surface is formed in the central portion, and the key groove formed on the upper frame 80 And a key portion formed thereon, the old dam ring 30 performing a linear reciprocating motion on the upper frame 80, and coupled by a key on the upper side of the old dam ring 30, and having a spiral scroll wrap 41. The swinging scroll 40 is formed, and the fixed scroll 50 is positioned above the swinging scroll 40 and fixed to the upper diaphragm and the outer shell of the compressor.

In addition, the discharge portion is formed in the central portion of the fixed scroll 50, the discharge port 60 for discharging the compressed refrigerant, and the discharge chamber 61 in communication with the discharge port 60, the uppermost of the compressor is formed And a discharge tube 62 formed on one side of the discharge chamber 61. In more detail, the orbiting scroll 40 and the fixed scroll 50 of the scroll compression unit are formed of a spiral scroll wrap 41, 51, the action of the swing scroll wrap 41 and the fixed scroll wrap 51 It will be described later.

In particular, the Oldham ring 30 according to the present invention is interposed between the pivoting scroll 40 and the upper frame 80 to engage, the body portion of the Oldham ring 30, the conventional Oldham ring body portion ( 15) and its shape to reduce the load on the key part of the old dam ring.

In detail, in the discharge unit, a check is fixed between the discharge port 60 and the discharge chamber 61 to prevent the reverse flow of the refrigerant discharged through the discharge port 60 and fixed to the discharge port 60. The valve 63 and the check valve housing 64 may be formed.

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 20 coupled with the rotor 22 of the drive motor rotates. As the driving shaft 20 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 70 communicates with the suction pipe 70. 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 40, and the compressed refrigerant is collected at the center of the scroll. The collected high pressure refrigerant is moved to the discharge chamber 61 through the discharge port 60. Here, the check valve 63 and the check valve housing 64 are formed so that the high-pressure refrigerant entering the discharge chamber does not flow back to the scroll compression unit, thereby preventing the back flow. Finally, the refrigerant accumulated in the discharge chamber 61 is discharged to the outside of the compressor through the discharge tube 62.

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

Referring to FIG. 4, the scroll compression unit is formed in a spiral shape on a lower side of the fixed scroll 50 in a spiral shape, and is formed in a spiral shape on an upper side of the pivoting scroll 40. A pivoting scroll wrap 41 inserted 180 degrees with respect to the 51 and a discharge port 60 at an inner end of the fixed scroll wrap 51 are included.

With this configuration, a process of compressing the refrigerant will be described.

First, the pivoting scroll 40 is eccentric about the drive shaft 20 to pivot (idle). Then, the pivoting scroll 40 is pivoted by the rotation of the drive shaft 20 with respect to the fixed scroll 50, whereby each of the wraps 41 and 51 is in contact with each other to form a pocket 99 for compressing the refrigerant. do.

In addition, the formed pocket 99 is reduced in volume as it returns to the center of the scroll wrap, and a high pressure is formed as the volume is reduced, and the formed high-pressure fluid is discharged through the discharge port 60 in the center of the scroll member. It is moved to the chamber 61.

5 is a bottom perspective view of the old dam ring according to the spirit of the present invention.

Referring to FIG. 5, the old dam ring 30 according to the present invention includes a body part 33 forming an overall shape, an upper key 31 protruding perpendicularly to an upper surface of the body part 33, and A lower key 32 is formed to protrude perpendicularly to the lower surface of the body portion 33.

In addition, the bottom of the old dam ring according to the present invention is projected on the lower surface of the body portion 33 to be coupled to the upper surface of the straight projection 36, which is formed to extend the upper key 31, the upper frame The lower key 32 is formed, and between the body portion 33 and the lower key 32, the protruding surface 37 having a length approximately symmetrically formed around the lower key 32 along the body portion 33. ), And grooves 34 and 35 formed on one side of the body portion between the upper key 31 and the lower key 32. The lower key 32 and the protruding surfaces 36 and 37 are formed to face each other.

In particular, the protruding surfaces 36 and 37 are formed to directly contact the upper frame 80 and the body part 33 of the Oldham ring to prevent a phenomenon of friction due to the reciprocating motion of the Oldham ring. have. The old dam ring 30 and the upper frame 80 may be prevented from being worn due to the friction.

Figure 6 is a plan perspective view of the old dam ring in accordance with the spirit of the present invention.

Referring to FIG. 6, the plane of the Oldham ring 30 according to the present invention includes an upper key 31 formed to be coupled with the swinging scroll 40 and an opposite body portion of the lower key 32, Curved square-shaped protrusions 38 and grooves 35 formed in the body portion between the protrusions 38 and the upper key 31 are included.

In particular, a protrusion 39 having the same height as the protrusion 38 is formed between the upper key 31 and the body portion 33. And, since the protrusions 38 and 39 are formed, the body portion 33 of the old dam ring and the bottom surface of the swing scroll 40 positioned on the upper surface of the old dam ring directly contact each other, resulting from the movement of the swing scroll. Friction can be prevented. And, by preventing the friction phenomenon, it is possible to prevent the body portion of the old dam ring to wear.

Hereinafter, based on FIGS. 5 and 6, it will be described the operation of the Oldham ring according to the present invention. The pivoting scroll 40 is linearly reciprocated in the horizontal direction along the shape of the upper key 31 when the drive shaft 20 is rotated in the state combined with the upper key 31. Accordingly, the side surface of the upper key 31 is in surface contact with the swinging scroll 40.

In addition, the old dam ring 30 is a linear reciprocating motion in the vertical direction on the thrust surface of the upper frame 80, while the swivel scroll 40 is linear reciprocating motion in the horizontal direction. As a result, the old dam ring 30 performs only a linear reciprocating motion during the turning motion of the turning scroll 40.

Here, the grooves 34 and 35 are formed in the body portion 33 of the old dam ring, thereby reducing the weight of the old dam ring and transferring the keys 31 and 32 by the turning movement of the swing scroll 40. To reduce the load. In addition, the cross-sectional shape of the body portion to the H shape to maintain the optimum rigidity and strength compared to the weight reduction.

In addition, the position of the groove is not limited to the upper and lower surfaces of the old dam ring 30, it may be formed on the side.

7 is a vertical cross-sectional view of the body portion of the old dam ring according to the spirit of the present invention, Figure 8 is a perspective view illustrating that the body portion of the old dam ring according to the spirit of the present invention is subjected to a bending load.

7 and 8, the vertical cross section of the body portion 33 shows an H shape, and by forming grooves on the upper and lower surfaces of the body portion 33, the weight of the old dam ring is reduced and transmitted to the body portion. The load F can be reduced. In addition, since the moment of inertia has a relatively large cross-sectional shape, the bending stiffness may be increased as compared with a rectangular cross section having the same cross-sectional area. The load F represents a load transmitted to the upper key 31 by the swinging motion of the swinging scroll 40, and the load transmitted to the upper key 31 acts as a bending load on the body portion 33. Will be.

9 is a perspective view illustrating that the old dam ring according to the spirit of the present invention is fitted between the swinging scroll and the upper frame.

Referring to FIG. 9, the scroll compression unit to which the Old Damling according to the present invention is applied is fixed to a swing scroll 40 for compressing a low pressure refrigerant at a high pressure, and positioned above the swing scroll 40, and having surface contact between the scroll wraps. A scroll 50 and an upper frame 80 fitted over the drive shaft 20 are included.

In detail, the pivoting scroll 40 according to the present invention has two key grooves 42 formed on the rear surface of the scroll so as to be symmetrical about the central axis, and a spiral scroll wrap 41 is formed on the upper surface of the scroll. In addition, a thrust surface 82 is formed on an upper surface of the upper frame 80 positioned below the old dam ring 30, and two key grooves 81 are symmetrical with respect to a central axis on an outer side of the thrust surface 82. Is formed.

The configuration of the Oldham ring 30 is the same as already described.

The lower key 32 of the old dam ring is seated in the key groove 81 formed in the upper frame 80, and the upper key 31 of the old dam ring is formed in the key groove 42 formed on the rear surface of the pivoting scroll 40. Is combined.

In addition, when the turning scroll 40 is rotated by the rotation of the drive shaft, the old dam ring 30 is linearly moved along the key groove on the upper frame 80. Then, the swinging claw 40 is linearly moved along the key groove 42 in the upper portion of the old dam ring in the direction crossing the straight direction of the old dam ring. As a result, the orbiting scroll 40 is idle.

 Here, by the protrusions 38 and 39 formed on the upper side of the old dam ring and the protrusions 36 and 37 formed on the lower side, the pivot scroll 40 and the upper frame 80 are the body portions of the old dam ring. Since surface contact with 33 does not occur, there is a feature that wear does not occur.

The scroll compressor having the old dam ring according to the present invention has an effect of reducing the cost by reducing the material cost of manufacturing the old dam ring by making the old dam ring have an H beam cross section.

In addition, by having the H-beam-shaped cross section showing good stiffness to the bending load, it is possible to reduce the weight of the old dam ring, the high rigidity is maintained despite the weight of the old dam ring is reduced.

In addition, as the weight of the old dam ring is reduced, the load acting on the key portion is reduced, and the load acting on the key portion is reduced, thereby reducing the wear of the key.

In addition, the wear of the key is reduced, thereby reducing the risk of abnormal noise and vibration.

1 is a cross-sectional view of a conventional general scroll compressor.

2 is a perspective view of a conventional Oldham ring.

3 is a vertical cross-sectional view illustrating a portion of a scroll compressor according to the spirit of the present invention.

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

5 is a bottom perspective view of the old dam ring according to the spirit of the present invention;

Figure 6 is a plan perspective view of the Oldham ring in accordance with the spirit of the present invention.

Figure 7 is a vertical cross-sectional view of the body portion of the old dam ring in accordance with the spirit of the present invention.

8 is a perspective view illustrating a bending load received by a body part of an old dam ring according to the spirit of the present invention;

9 is a perspective view illustrating that the old dam ring according to the spirit of the present invention is sandwiched between the swinging scroll and the upper frame.

<Explanation of symbols for the main parts of the drawings>

20: drive shaft 30: Oldhamling 40: swing scroll

50: fixed scroll 60: discharge port 70: suction pipe

80: upper frame

Claims (3)

An upper frame supporting an upper portion of the drive shaft; A fixed scroll fixed to the upper frame; A pivoting scroll which performs compression of the fluid while pivoting between the fixed scroll and the upper frame; An approximately circular body portion, one or more keys formed in the body portion to be inserted into one side of the pivoting scroll, one or more keys formed in the body portion and inserted into one side of the upper frame, and the body portion And an old dam ring including grooves formed by being recessed in the scroll compressor. The method of claim 1, The groove is scroll compressor, characterized in that formed in at least one of the upper side and the lower side of the body portion. The method of claim 1, And the groove is formed in at least one of the inner side and the outer side of the body portion.