KR20040040203A - Scroll compressor with oil control function - Google Patents

Abstract

PURPOSE: A scroll compressor having an oil control function is provided to reduce friction loss by increasing an amount of oil supplied to a thrust bearing surface supporting a rotary scroll, and improve the compressing performance. CONSTITUTION: A casing(11) forms a receiving space inside. A fixed scroll(22) is fixedly arranged inside the casing. A rotary scroll(32) is combined with the fixed scroll to be relatively movable for compressing a refrigerant. A rotary shaft(45) is arranged in association with upper and lower directions of the casing for eccentrically moving the rotary scroll, and has an oil supply path(46) for supplying oil of a lower area of the casing to an upper area. A thrust bearing surface(66) supports the rotary scroll. An upper bearing part rotatively supports the rotary shaft. An oil receiving part(64) temporarily receives the oil supplied through the oil supply path. An upper frame(61) has an oil drain path(67) to discharge the oil of the oil receiving part. An oil drain opening and shutting valve(71) opens and shuts the oil drain path to control a pressure of the oil received in the oil receiving part.

Description

SCROLL COMPRESSOR WITH OIL CONTROL FUNCTION}

The present invention relates to a scroll compressor with an oil control function, and more particularly, to increase the amount of oil supplied to the thrust bearing surface for supporting the swing scroll to reduce friction loss and to improve the compression performance. A scroll compressor having an oil control function is provided.

1 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 2 is an enlarged view of the drainage path region of FIG. 1. As shown in these figures, the scroll compressor includes a casing 11 forming an enclosed receiving space therein, a compression unit 21 arranged in the upper upper region of the casing 11 to compress the refrigerant, and a compression. The electric motor part 41 which is arrange | positioned under the part 21 and provides a driving force to the compression part 21 is provided.

One side of the casing 11 is provided with a suction pipe 13 to suck the refrigerant from the outside, and the discharge pipe 15 is provided on the upper side of the suction pipe 13 to discharge the compressed refrigerant.

The compression section 21 includes an involute-shaped fixed blade 23 and fixed scroll 22 fixedly disposed inside the casing 11 and an involute-shaped swing blade 33 corresponding to the fixed blade 23. And a rotating scroll (32) for compressing the refrigerant while moving relative to the fixed scroll (22).

The electric motor part 41 includes a stator 43 fixedly disposed inside the casing 11, a rotor 44 rotatably disposed within the stator 43, and a rotor 44. It comprises a rotary shaft 46 which is rotatably coupled to the shaft core integrally.

On the other hand, on the upper side of the fixed scroll 22 is provided a high and low pressure separating plate 51 for partitioning the inner space of the casing 11 into a high pressure chamber (H) and a low pressure chamber (L), On the lower side is provided with a thrust bearing surface 66 in contact with the revolving scroll 32 is provided with an upper frame 61 for supporting the revolving scroll 32 to revolve. An upper bearing portion 62 is formed in the central region of the upper frame 61 so as to support the rotation shaft 46 to rotate, and an oil accommodating portion 64 for accommodating oil on the upper side of the upper bearing portion 62. ) Is formed. One side of the oil receiving part 64 is formed with a drainage passage 67 in communication with the outside so as to discharge the oil of the oil receiving part 64.

An oil storage portion 17 is formed in the lower region of the casing 11 so that oil can be stored, and an upper bearing portion 17 is provided at an upper side of the oil storage portion 17 so as to support rotation of the lower end of the rotation shaft 46. The lower frame 81 in which 82 is formed is provided.

An eccentric portion 49 is formed at the upper end of the rotating shaft 46 so as to eccentrically move the turning scroll 32, and the axial center has a thrust bearing surface 66 and an upper bearing portion of oil in the oil storage unit 17. An oil supply passage 46 is formed to be supplied to the 62 and the lower bearing portion 82, respectively. The lower end of the oil supply passage 46 is provided with an oil pump 48 so as to feed the oil upward through the oil supply passage 46 during the rotation of the rotary shaft 46.

By this configuration, when the rotating shaft 46 is rotated, the turning scroll 32 makes a pivoting movement with respect to the fixed scroll 22, and thus the refrigerant sucked into the compression space S through the suction pipe 13 is compressed. And discharged into the high pressure chamber (H).

When the oil pump 48 is rotated integrally with the rotating shaft 46, the oil of the oil storage unit 17 moves upward along the oil supply path 46, and a part of the oil pump 48 is supplied to the lower bearing part 82. Some of the oil moved upward is supplied to the upper bearing portion 62, and the other is discharged to the oil receiving portion 64 so that the oil is supplied to the thrust bearing surface 66. Some of the oil contained in the oil receiving unit 64 is recovered to the oil storage unit 17 through the drainage path 67.

However, in such a conventional scroll compressor, a relatively large compression pressure is applied between the thrust bearing surface 66 and the turning scroll 32 when the refrigerant is compressed, so that the oil forms a coating film having a sufficient thickness. It is difficult to supply so that, on one side of the oil receiving portion 64 is formed with a flow path 67 in communication with the outside of the upper frame 61 for the recovery of oil can not increase the oil supply pressure more than a certain amount. Therefore, the contact area between the thrust bearing surface 66 and the revolving scroll 32 has a problem that relatively large friction and heat generation occurs, resulting in shortening of life and deterioration of performance.

Accordingly, it is an object of the present invention to provide a scroll compressor with an oil adjustment function that can reduce friction loss and improve compression performance by increasing the amount of oil supplied to the thrust bearing surface supporting the turning scroll. .

1 is a longitudinal sectional view of a conventional scroll compressor;

2 is an enlarged view of the drainage path region of FIG. 1;

3 is a longitudinal sectional view of a scroll compressor having an oil control function according to an embodiment of the present invention;

4 is an enlarged view illustrating main parts of FIG. 3;

5 is a view for explaining the operation of the oil passage opening and closing valve of FIG.

Figure 6 is an enlarged cross-sectional view of the oil passage opening and closing valve region of the scroll compressor with an oil control function according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

11: casing 22: fixed scroll

32: turning scroll 45: rotating shaft

46: oil supply path 48: oil pump

61: upper frame 62: upper bearing portion

64: oil holding part 66: thrust bearing surface

67: drainage path 68a: horizontal section

68b: vertical section 71: oil path open and close valve

73: valve spring

According to the present invention, the object and the casing to form a receiving space therein; A fixed scroll fixed to the inside of the casing, and a rotating scroll coupled to the fixed scroll in a relative motion to compress the refrigerant; A rotation shaft disposed along an up and down direction of the casing, the oil supply passage being formed to eccentrically move the pivoting scroll, and to supply oil in the lower region of the casing to the upper region; Thrust bearing surface for contacting the turning scroll, an upper bearing portion for supporting the rotating shaft in the center, and an oil receiving portion formed to temporarily receive the oil supplied through the oil supply passage on the upper bearing portion. And an upper frame having a drainage channel to discharge the oil in the oil receiving part; It is achieved by a scroll compressor having an oil control function, characterized in that it comprises an oil passage opening and closing valve for opening and closing the oil passage so that the pressure of the oil accommodated in the oil receiving portion can be adjusted.

Here, the drainage path is formed to include a horizontal section formed horizontally in the axial direction of the rotary shaft and a vertical section communicated with the horizontal section and in communication with the outside along the rotation axis direction, Preferably, the on-off valve is slidably accommodated in the horizontal section so as to open and close the vertical section.

It is effective to further include a valve spring disposed elastically on one side of the flow path open and close valve to apply an elastic force to block the vertical section.

The drain passage opening valve is preferably configured to open and close the drain passage from the outside of the upper frame.

The exhaust channel opening and closing valve is effectively formed of a leaf spring member.

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

3 is a longitudinal sectional view of a scroll compressor having an oil control function according to an embodiment of the present invention, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIG. It is for the drawing. The same and equivalent parts as those described above and shown in the drawings will be described with the same reference numerals for convenience of description. As shown in these figures, the scroll compressor with the oil adjusting function includes a casing 11 forming an accommodating space therein and an involute-shaped fixed blade 23 in the casing 11. A fixed scroll 22 that is fixedly arranged and a swing blade 33 that forms a compressed space S of the refrigerant in cooperation with the fixed blade 23 and is pivotally disposed relative to the fixed scroll 22. A rotating shaft 46, which is arranged to eccentrically move the scroll 32, the turning scroll 32, and has an oil supply passage 46 to supply oil therein, and a turning scroll 32 below the turning scroll 32. An oil accommodating part 64 formed to be able to receive oil between the thrust bearing surface 66 which contacts the 32 and supports the turning scroll 32, and the rotating shaft 46, and an oil accommodating part ( The exhaust passage 67 formed in communication with the outside to discharge the oil of 64) Ruthless and the upper frame 61, and is configured to include a thrust bearing surface 66 times the flow path opening and closing valve 71 for opening and closing (67) to the endosperm so that it can be adjusted the amount of the pressure / oil of the oil fed to the.

A suction pipe 13 and a discharge pipe 15 are respectively provided at one side of the casing 11 so as to suck and discharge the refrigerant, and the inner space is connected to the high pressure chamber H and the low pressure chamber L in the upper upper region. The high and low pressure separation plate 51 to be removed is provided.

A compression section 21 having a fixed scroll 22 and a swing scroll 32 is disposed below the high and low pressure separating plate 51 and a stator (below) of the compression section 21. 43), the electric motor part 41 which has the rotor 44 and the rotating shaft 46 and provides the driving force to the compression part 21 is arrange | positioned. An oil supply passage 46 is formed in the rotary shaft 46 to supply oil upward, and an oil pump 48 is provided at the lower end thereof. An upper frame 61 and a lower frame 81 are respectively provided on the upper and lower sides of the electric motor part 41 along the axial direction of the rotating shaft 46 so as to support the rotating shaft 46.

An upper bearing portion 62 is formed in the central region of the upper frame 61 so as to rotatably support the upper region of the rotating shaft 46, and on one side of the lower frame 81, The lower bearing portion 82 is formed to rotatably support the lower end.

On the other hand, the upper frame 61 is provided with a thrust bearing surface 66 that is recessed downward from the upper surface so as to accommodate the swinging scroll 32 so as to support the eccentric motion and support the bottom of the swinging scroll 32. The oil receiving portion 64 is formed between the thrust bearing surface 66 and the upper bearing portion 62 to accommodate the oil between the turning scroll 32 along the thickness direction of the upper frame 61. It is. One side of the oil receiving part 64 is formed with an oil passage 67 in communication with the outside so that the oil of the oil receiving part 64 can be recovered to the oil storage part 17. The drainage passage 67 has a horizontal section 68a extending from the oil receiving section 64 horizontally in the axial direction of the rotary shaft 46, and one side communicates with the horizontal section 68a, and the other end thereof has the rotary shaft 46. The vertical section 68b communicates with the outside along the axial direction of the cross section.

Inside the horizontal section 68a, it is accommodated to be flowable along the horizontal section 68a, and is openable and closed along the channel opening / closing valve 71 for opening and closing the vertical section 68b, and along the horizontal section 68a. The valve springs 73 are applied to the drain passage opening and closing valve 71 so as to be accommodated so that the drain passage opening and closing valve 71 blocks the vertical section 68b.

By this configuration, when the rotating shaft 46 is rotated, the refrigerant is sucked into the fixed scroll 22 and the turning scroll 32 and compressed, and the compressed refrigerant is discharged to the high pressure chamber (H). On the other hand, when the rotary shaft 46 is rotated, the oil pump 48 is rotated integrally with the rotary shaft 46, the oil of the oil reservoir 17 by the rotation of the oil pump 48 is the oil supply passage 46 Will move upward. Some of the oil moved upward is supplied to the lower bearing portion 82. Some of the oil moved upward through the lower bearing portion 82 is supplied to the upper bearing portion 62, and the remaining portion is supplied into the oil receiving portion 64. At this time, the oil passage opening and closing valve 71 blocks the vertical section 68b by the elastic force of the valve spring 73, so that the pressure of the oil contained in the oil receiving portion 64 increases.

As a result, the oil is supplied to the contact area between the thrust bearing surface 66 and the turning scroll 32 at a relatively high supply pressure to increase the thickness of the oil coating film, thereby reducing friction and heat generation and cooling the contact surfaces. . When the pressure of the oil inside is greater than the elastic force of the valve spring 73, the oil passage opening and closing valve 71 flows in the direction in which the valve spring is compressed to open the vertical section 68b, the vertical section 68b is When opened, the oil of the oil receiving part 64 is discharged to the outside along the drainage path 67 and recovered to the oil storage part 17. When the oil is discharged and the pressure of the oil is lower than the elastic force of the valve spring 73, the oil passage opening / closing valve 71 blocks the vertical section 68b so that the supply pressure of the oil inside the oil receiving portion 64 is constant. Keep the ideal.

Figure 6 is an enlarged cross-sectional view of the oil passage opening and closing valve region of the scroll compressor with an oil control function according to another embodiment of the present invention. As shown, the thrust bearing surface 66 and the oil receiving portion 64 are formed on the upper frame 61 of the scroll compressor having the oil adjusting function. On one side of the oil receiving portion 64 in the axial direction of the rotation axis 46 horizontally one side is in communication with the oil receiving portion 64 and the other side is formed through the oil passage 67, the upper frame ( Outside the 61, the oil passage opening and closing valve 85 is provided to open and close the oil passage 67.

The exhaust channel opening and closing valve 85 is formed of a plate-like spring member having an elastic force so that the pressure of the oil in the oil receiving part 64 can be opened at a predetermined level or more, and one side of the drain valve 89 is fixed to the bolt. The stopper 87 is fixed to the outside of the oil passage opening / closing valve 85 so as to limit the opening range of the oil passage opening / closing valve 85.

By this configuration, the oil passage opening and closing valve 85 blocks the oil passage 67 by its elastic force, and in this state, when the rotary shaft 46 is rotated, the oil pump 48 is provided inside the oil receiving portion 64. Oil is supplied and received. When the supply amount of oil is increased, the pressure of the oil is increased, thereby increasing the thickness of the coating film of the oil due to the relatively high oil supply pressure in the contact area between the thrust bearing surface 66 and the turning scroll 32, thereby causing friction and heat generation. It reduces the pressure and promotes cooling.

On the other hand, when the pressure of the oil contained therein increases and becomes greater than the elastic force of the oil passage opening and closing valve 85, the oil passage opening and closing valve 85 is elastically deformed to the outside to open the oil passage (67). When the oil passage 67 is opened, the oil is discharged along the oil passage 67 and recovered to the oil storage unit 17. When the pressure of the internal oil is lower than the elastic force of the oil passage opening / closing valve 85, the oil passage opening / closing valve 85 blocks the oil passage 67 so that the supply pressure of the oil supplied therein is maintained above a certain level.

As described above, according to the present invention, by providing a drain passage opening and closing valve for opening and closing the drain passage so that the pressure of the oil supplied therein can be maintained above a certain level, the thickness of the oil film of the thrust bearing surface is increased It is possible to reduce the friction and heat generation, and to promote the cooling of the contact surface to extend the service life and to provide a scroll compressor with an oil control function to improve the performance.

Claims (5)

A casing forming an accommodation space therein; A fixed scroll fixed to the inside of the casing, and a rotating scroll coupled to the fixed scroll in a relative motion to compress the refrigerant; A rotation shaft disposed along an up and down direction of the casing, the oil supply passage being formed to eccentrically move the pivoting scroll, and to supply oil in the lower region of the casing to the upper region; Thrust bearing surface for contacting the turning scroll, an upper bearing portion for supporting the rotating shaft in the center, and an oil receiving portion formed to temporarily receive the oil supplied through the oil supply passage on the upper bearing portion. And an upper frame having a drainage channel to discharge the oil in the oil receiving part; And an oil passage opening / closing valve for opening and closing the oil passage so that the pressure of the oil accommodated in the oil receiving part can be adjusted. The method of claim 1, The drainage passage includes a horizontal section formed horizontally in the axial direction of the rotary shaft and a vertical section communicated with the horizontal section and in communication with the outside along the rotation axis direction, the drain passage opener valve The scroll compressor having an oil control function, characterized in that the slide is accommodated in the horizontal section so as to open and close the vertical section. The method of claim 2, And a valve spring disposed elastically on one side of the oil passage opening and closing valve to apply an elastic force to the oil passage opening and closing valve to block the vertical section. The method of claim 1, The oil passage opening and closing valve is a scroll compressor having an oil control function, characterized in that for opening and closing the oil passage in the outside of the upper frame. The method of claim 4, wherein The exhaust passage opening and closing valve is a scroll compressor having an oil control function, characterized in that formed by a leaf spring member.