JP3128317B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor in which oil is uniformly supplied to a sliding surface between a boss hole of a driving means mounted on a rotating shaft and a boss of an orbiting scroll.

[0002]

2. Description of the Related Art A conventional scroll compressor is configured as shown in, for example, Japanese Patent Application Laid-Open No. 1-170774. Here, a conventional example will be described with reference to this publication.
In FIG. 4, reference numeral 50 denotes an airtight container having an oil reservoir 51 at the bottom, in which a compression element 52 is disposed on the upper side and a frame 54 for isolating the electric element 53 is disposed on the lower side. The center of the frame is formed integrally with the main bearing 55, and supports the rotating shaft 56 of the electric element 53.
The compression element 52 includes a fixed scroll 57 and an orbiting scroll 5
8 is provided. The fixed scroll 57 includes a head plate 59,
The orbiting scroll 58 is formed by a wrap 60 erected on the end plate, a oscillating scroll 58 includes a head plate 61, a wrap 62 erected on one surface of the end plate, and a boss 63 protruded on the other surface. It is formed with.

Further, the fixed scroll 57 and the orbiting scroll 58 form a plurality of compression spaces 64 by engaging the wraps 60 and 62 with each other. The fixed scroll 57 is fixed to the frame 54, and the orbiting scroll 58 is turned by inserting it into a boss hole 65 provided eccentrically with respect to the axis of the rotating shaft 56 at the tip of the rotating shaft 56. On the other hand, an Oldham coupling 66 that revolves the orbiting scroll 58 without rotating it is used.

[0004] The electric element 53 is composed of a stator 67 fixed to the inner wall of the sealed container 50 and a rotor 68 inserted into the rotating shaft 56 inside the stator.

Reference numeral 69 denotes an oil supply hole provided at the center of the rotary shaft 56 along the axis. The oil supply hole is open to the boss hole 65. Reference numeral 70 denotes a suction pipe, which is opened below the electric element 53 in the closed casing 50. Reference numeral 71 denotes a discharge hole provided at the center of the end plate 59 of the fixed scroll 57, and the discharge hole communicates with a high-pressure space 72 formed by the closed container 50 and the fixed scroll 57. 73 is a closed container 50
Is a discharge pipe which is attached to the upper wall and opens to the high-pressure space 72.

In the scroll compressor having this structure, the rotating shaft 5
The lubrication surface between the boss hole and the boss 63 of the orbiting scroll 58 is lubricated with the oil supplied from the oil supply hole 69 into the boss hole 65.

[0007]

However, the oil supply hole 69 is provided with the tip opening to the boss hole 65 coincident with the axis, and the oil is uniformly distributed by the centrifugal pump action determined by the diameter of the oil supply hole 69. The oil supply amount cannot be increased by the centrifugal pumping action of the oil supply hole, and the oil uniformly flows out of the oil supply hole by centrifugal force in the boss hole 65 eccentric to the oil supply hole 69. Flow is disturbed and oil cannot be supplied uniformly to the sliding surface with the boss 63.

The present invention solves the above problems,
It is an object of the present invention to provide a scroll compressor in which the amount of oil supplied to an oil supply hole is increased and the flow of oil in a boss hole is not disturbed.

[0009]

SUMMARY OF THE INVENTION The present invention provides a closed container having an oil reservoir at the bottom, a frame stored in the container, a scroll compression element disposed on the upper side of the frame, and a lower part disposed on the lower side. A rotary shaft having a lubrication hole in the center for supplying the oil of the oil storage portion to each sliding portion while transmitting the rotational force of the electric element to the scroll compression element while being axially supported by the bearing of the frame. A fixed scroll for erecting the spiral wrap on the head plate, and a swing for erecting the boss on one surface of the end plate and projecting the boss on the other surface. A scroll, a driving means mounted on the rotating shaft by forming a boss hole for fitting the boss of the orbiting scroll eccentrically with the axis of the rotating shaft, and a fixed scroll Constituted by the coupling means to be revolved without rotating relative Lumpur, to form a plurality of compression spaces therein engaged each other wraps the fixed scroll and the orbit scroll rotate upper end of the oil supply hole It is formed eccentric with the axis of the shaft, and the upper end of the oil supply hole of the rotary shaft is aligned with the axis of the boss hole, or in the direction of the axis of the boss hole.
It is formed eccentrically.

[0010]

According to the present invention having the above-described structure,
The axis of the upper end of the oil supply hole is eccentric from the axis of the rotary shaft in the eccentric direction of the boss hole, and is aligned with the axis of the boss hole. And the flow of oil from the oil supply hole into the boss hole matches the flow of oil in the boss hole, and the sliding surface between the rotating boss hole and the orbiting scroll boss that revolves without rotating. The oil is supplied to the oil uniformly.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a sectional view of a scroll compressor showing one embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part showing a state in which a swing scroll is fitted to a swing link attached to a rotary shaft according to the present invention. FIG. 3 is an enlarged plan view showing the relationship between the boss hole and the oil supply hole according to the present invention.

Reference numeral 1 denotes a sealed container having an oil reservoir 2 at the bottom, and a frame 4 having a bearing 3 at the center in the container.
The scroll compression element 5 disposed on the upper side of the frame, the electric element 6 disposed on the lower side, and the rotational force of the electric element 6 that is supported by the bearing 3 of the frame 4 and transmitted to the scroll compression element 3. The rotating shaft 7 is housed.

The scroll compression element 5 is a fixed scroll 8
And an orbiting scroll 9. The fixed scroll 8 is in pressure contact with the inner wall of the sealed container 1 to partition the inside of the container into a high-pressure chamber 10 and a low-pressure chamber 11, and an annular wall 13 protruding from one peripheral edge of one surface of the head plate. A spiral wrap 14 formed of an involute shape or a curve similar to the involute shape and erected on the end plate 12 surrounded by the annular wall.
It is composed of The fixed scroll 8 has a downward projecting direction of the annular wall 13 and the wrap 14.

The orbiting scroll 9 has a disk-shaped end plate 15,
A spiral wrap 16 composed of an involute or an approximate curve standing on one surface of the end plate;
A boss 17 protrudes from the center of the other surface of the end plate 15. And the orbiting scroll 9 is a wrap 16
This wrap is engaged with the wrap 14 of the fixed scroll 8 with the projecting direction of
8 are formed.

The end plate 14 of the fixed scroll 8 is provided at the center thereof with a discharge hole 19 communicating with the compression space 18.

Reference numeral 20 denotes a swing link which also serves as a drive means for connecting the rotary shaft 7 and the orbiting scroll 9. The swing link has a drive pin 21 provided at the tip of the rotary shaft 7.
The eccentric hole 22 for fitting the boss 1 of the orbiting scroll 9
Boss hole 23 in which the shaft 7 is fitted, and the drive pin 21 of the rotating shaft 7
And a regulating hole 25 for loosely fitting a regulating pin 24 fixed to the rotating shaft 7 so as to regulate the swing of the swing link 20 with the fulcrum as a fulcrum.

The axis O of the boss hole 23 of the swing link 20
Is eccentric with the axis P of the rotating shaft 7.

At the center of the rotating shaft 7, a scroll compression element 5 is provided.
Each of the sliding portions is provided with an oil supply hole 26 for supplying the oil in the oil storage portion 2, and this oil supply hole is open to the boss hole 23. The center of the oil supply hole 26 coincides with the axis P of the rotating shaft 7. At the upper end of the rotary shaft 7, an oil supply collar 27 which is displaced in the eccentric direction of the boss hole 23 and communicates with the oil supply hole 26 is mounted so as to slightly protrude inside the boss hole 23. Reference numeral 28 denotes an oil guide cup fixed to the oil supply collar 27 and arranged at the bottom of the boss hole 23. The axis of the refueling collar 27 coincides with the axis O of the boss hole 23.

Reference numeral 29 denotes a joint means for revolving the swinging scroll 9 with respect to the fixed scroll 8 without rotating the joint scroll. This joint means is formed by an Oldham joint disposed between the frame 4 and the swinging scroll 9. ing.

Reference numeral 30 denotes a suction pipe attached to the closed vessel 1, and this suction pipe communicates with the low pressure chamber 11 in the closed vessel 1. Reference numeral 31 denotes a suction passage formed in the frame 4 for guiding the refrigerant in the low-pressure chamber 11 to the scroll compression element 5. Reference numeral 32 denotes a discharge pipe attached to the upper wall of the closed vessel 1, and this discharge pipe communicates with the high-pressure chamber 10 in the closed vessel 1.

In the scroll compressor configured as described above, when the electric element 6 is rotated, the rotational force is transmitted to the orbiting scroll 9 via the rotating shaft 7. That is, the orbiting scroll 9 is driven by inserting the boss 17 into the boss hole 23 of the swing link 20 attached to the rotating shaft 7, and revolves on a circular orbit without rotating with respect to the fixed scroll 8 by the joint means 29. Let me do. The fixed scroll 8 and the orbiting scroll 9 gradually reduce the compression space 18 formed by these scrolls from the outside to the inside, and flow into the low pressure chamber 11 from the suction pipe 30 to suck the frame 4. The refrigerant flowing from the passage 31 to the scroll compression element 5 is compressed. The compressed refrigerant is discharged from the discharge hole 19 provided in the end plate 12 of the fixed scroll 8 to the outside of the closed container 1 through the discharge pipe 34 via the high-pressure chamber 10.

The oil supply collar 27 attached to the upper end of the rotary shaft 7 and communicating with the oil supply hole 26 is provided eccentrically with respect to the axis P of the oil supply hole, so that the amount of oil supplied from the oil reservoir 2 to the oil supply hole 26 can be reduced. As it increases, it flows into the boss hole 23 from one location on the same side as the eccentric direction from the rotation shaft 7.

The axis of the lubrication collar 27 is located in the boss hole 23.
, The flow of oil flowing from the oil supply collar into the boss hole 23 and the flow of oil due to centrifugal force in the boss hole are in the same direction. This prevents the oil from flowing into the hole 23 and disturbing the oil flow in the oil guide cup 28 in the boss hole. The oil flowing into the boss hole 23 from the oil supply collar 27 is supplied to one portion of the sliding surface of the boss hole 23 to lubricate the sliding surface of the orbiting scroll 9 with the boss 17. That is, the boss hole 23 rotates around the boss 17 of the orbiting scroll 9, which rotates together with the rotating shaft 7 and is prevented from rotating by the joint means 29, and the oil supplied to one portion of the boss hole 23 Thus, the sliding surface between the boss and the boss hole can be uniformly lubricated. The oil supply collar 27 projects upward so that the oil in the boss hole 23 does not return to the oil supply hole 26.

[0025]

As described above, according to the present invention, an airtight container having an oil reservoir at the bottom, a frame accommodated in the container, a scroll compression element disposed above the frame, and An electric element arranged on the side and a shaft supported by the bearing of the frame to transmit the rotational force of the electric element to the scroll compression element, and an oil supply hole is provided at the center for supplying the oil in the oil storage section to each sliding section. The scroll compression element is provided with a fixed scroll for erecting a spiral wrap on the end plate, and a spiral wrap on the one surface of the end plate and projecting a boss on the other surface. An orbiting scroll, a boss hole for fitting the boss of the orbiting scroll formed eccentrically with respect to the axis of the rotating shaft, and a driving means mounted on the rotating shaft; The orbiting scroll and the fixed scroll are wrapped with each other to form a plurality of compression spaces therein, and the upper end of the oil supply hole is formed by a rotating shaft. And the upper end of the oil supply hole of the rotary shaft is formed to coincide with the axis of the boss hole, so that the oil supply amount in the oil supply hole can be increased, and ,
The flow of the oil flowing from the oil supply hole to the boss hole and the flow of the oil in the boss hole are caused to be in the same direction, thereby preventing the oil supply amount to the sliding surface between the boss hole and the boss from being reduced. In addition, the sliding surface can be uniformly lubricated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll compressor showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a state in which a swing scroll is fitted to a swing link attached to a rotary shaft according to the present invention.

FIG. 3 is an enlarged plan view showing a relationship between a boss hole and an oil supply hole according to the present invention.

FIG. 4 is a sectional view of a conventional scroll compressor.

[Description of Signs] 1 Closed container 2 Oil storage section 3 Bearing 4 Frame 5 Scroll compression element 6 Electric element 7 Rotary shaft 8 Fixed scroll 9 Swing scroll 12,15 End plate 14,16 Lapping 17 Boss 18 Compression space 20 Swing link 23 Boss hole 26 Oil supply hole 27 Oil supply collar 29 Joint means

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinichi Fujiwara 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-2-75784 (JP, A) JP-A-Hei 3-229983 (JP, A) JP-A-2-185686 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] A closed container having an oil reservoir at the bottom, a frame housed in the container, a scroll compression element disposed above the frame, an electric element disposed below the frame, A rotary shaft that is rotatably supported by a bearing of the frame and transmits the rotational force of the electric element to the scroll compression element, and has an oil supply hole at the center for supplying oil from an oil storage section to each sliding section; The elements are a fixed scroll with a spiral wrap standing on the head plate, an orbiting scroll with a spiral wrap standing on one surface of the head plate and a boss protruding on the other surface, A boss hole for fitting the boss is formed eccentrically with respect to the axis of the rotating shaft, and a driving means attached to the rotating shaft, and the swinging scroll is rotated without rotating with respect to the fixed scroll. It is composed of joint means for turning,
The oscillating scroll and fixed scroll wrap with each other
In a scroll compressor in which a plurality of compression spaces are formed inside by engaging each other , an upper end of the oil supply hole is formed eccentrically with an axis of a rotation shaft, and an upper end of the oil supply hole of the rotation shaft is a boss hole. Or the boss hole
A scroll compressor formed eccentrically in the axial direction of the scroll compressor.