KR100414123B1 - Device for reducing frictional loss of scroll compressor - Google Patents

Abstract

The present invention relates to a friction loss reduction structure of a scroll compressor, the present invention is to form a compression space that is continuously moved between the fixed scroll and the rotating scroll while the swinging scroll is coupled to the rotating shaft, If the pressure rises excessively, a sliding bush is provided between the rotating shaft and the boss portion of the rotating scroll so that the turning scroll retreats radially within a certain range by gas force and is spaced apart from the fixed shaft. In a scroll compressor via a swing bush, at least one of the outer edge of the sliding bush or the inner edge of the swing bush facing the swing bush forms a chamfer, so that even if the swing scroll is tilted, the boss portion and the swing bush of the swing scroll are tilted. Is in sliding contact with the sliding bush Wear or friction losses between the bush can be prevented.

Description

DEVICE FOR REDUCING FRICTIONAL LOSS OF SCROLL COMPRESSOR}

The present invention relates to an apparatus for reducing frictional loss of a scroll compressor, and more particularly, to an apparatus for reducing frictional friction of a scroll compressor having a chamfer formed at a lower end of a sliding bush to reduce wear and frictional loss with a swing scroll.

In general, the scroll compressor is a fixed radius scroll compressor in which the turning scroll always swings in the same trajectory regardless of the change of the compression condition according to the radial leakage prevention method, and liquid refrigerant, oil, or foreign matter flows into the compression chamber, When the pressure rises abnormally, the turning scroll is divided into a variable radial scroll compressor which is arranged to retract radially to prevent breakage of the lap.

In order to vary the turning radius of the turning scroll in the variable radius scroll compressor, a method of interposing a sliding bush or a slide block or interposing an eccentric bush is generally known between the rotating shaft and the turning scroll. Among them, the present invention looks at a variable radius scroll compressor having a sliding bush.

Conventional variable radius scroll compressor is fixed to the main frame (1), as shown in Figure 1, the fixed scroll (2) having a spiral wrap (2a), and the wrap (2a) of the fixed scroll (2) A rotating scroll (3) disposed between the main frame (1) and the fixed scroll (2) and having a spiral wrap (3a) engaged with and engaged with the rotating scroll (3). Rotational shaft (4) coupled to the driving motor and the swinging scroll to be transmitted to the rotational motor, and inserted between the swinging scroll and the rotational shaft (4) to transfer the rotational force of the drive motor to the swinging scroll (2) and at the same time the rotating scroll (2) It includes a sliding bush (5) to induce to retreat in a certain range.

A sliding bush 5 is inserted into the front end surface of the rotating shaft 4 so as to eccentrically protrude the driving pin 4a for transmitting the rotational force to the swinging scroll 3, and the sliding bush 5 is provided on both sides of the driving pin 4a. The sliding parts 4b and 4b cut in the plane are formed so that the sliding surfaces 5b and 5b of () may be brought into sliding contact with each other.

The sliding bush 5 is inserted into the swing bush 6 press-fitted into the boss portion 3b of the swing scroll 3 so as to slide relative to the swing bush 6 in the circumferential direction and to the driving pin portion 4a of the rotary shaft 4. As shown in FIG. 2 or FIG. 3, the outer diameter is formed to have the same outer diameter from the upper end to the lower end so as to perform relative movement while sliding in one radial direction.

Moreover, the sliding bush 5 forms the pinhole 5a which inserts so that the drive pin part 4a of the rotating shaft 4 may make a relative movement, sliding in one direction radial direction.

The pinhole 5a is formed in a long hole shape in the radial direction, and both side surfaces in the short axis direction are formed in the sliding surfaces 5b and 5b so as to be in sliding contact with the sliding portions 4b and 4b of the rotating shaft 4 described above. Doing.

In the figure, reference numeral 2b denotes a suction port, 2c a discharge port, and P denotes a compression space.

The conventional variable radius scroll compressor configured as described above operates as follows.

That is, when power is applied to the driving motor (not shown), the rotating shaft 4 press-fitted to the driving motor rotates so that the turning scroll 3 turns by an eccentric distance, and the turning scroll 3 is fixed scroll ( A plurality of compression spaces P are formed between the laps 2a and 3a with 2), and the compression space P moves to the center by the continuous turning motion of the turning scroll 3 and decreases in volume to form a refrigerant. The gas is sucked and compressed and discharged.

At this time, when the refrigerant gas flowing into the compression space (P) maintains the normal state, the turning scroll (3) receives the centrifugal force and the opposite gas force evenly, the wrap (3a) of the turning scroll (3) and the fixed scroll ( While the wrap 2a of 2) is in line contact with each other, both compression spaces P form a sealed space with each other, while a refrigerant gas flowing into the compression space P contains a predetermined amount of liquid refrigerant, oil or other foreign matter. In this case, the pressure of the compression space P rises abnormally so that the gas force applied to the turning scroll 3 is greater than the centrifugal force, and the sliding bush 5 slides on the driving pin 4a, thereby retracting the turning scroll 3. When the wrap 3a of the turning scroll 3 and the wrap 2a of the fixed scroll 2 fall, the compressed gas in the high pressure side compression space leaks into the low pressure side compression space and the wraps 2a and 3a according to the overcompression. ) To prevent damage.

However, in the conventional variable radius scroll compressor as described above, the turning scroll (3) is finely inclined and revolving as the turning scroll is eccentric at the center of rotation of the rotating shaft (4), so the turning scroll (3) in this process The turning bush 6 press-fitted into the boss part 3b of the upper part and the main surfaces adjacent to the upper and lower edges or the corners of the sliding bush 5 are in contact with each other, causing friction loss or irregular wear, thereby increasing the friction loss. There was.

The present invention has been made in view of the problems of the conventional scroll compressor as described above, the scroll compressor that can reduce the friction loss by dispersing the stress load between the swing bushing pressed into the swing scroll and the sliding bush in sliding contact with it It is an object of the present invention to provide a friction loss reduction device.

1 is a longitudinal sectional view showing a compression part of a conventional variable radius scroll compressor.

FIG. 2 is a cross-sectional view taken along line "I-I" of FIG.

Figure 3 is a perspective view showing a sliding bush of a conventional variable radius scroll compressor.

Figure 4 is a longitudinal sectional view showing a state in which the sliding bush and the sliding bush in contact with the conventional variable radius scroll compressor.

Figure 5 is a longitudinal sectional view showing the main part of the present invention variable radius scroll compressor.

6 and 7 are a perspective view and a longitudinal sectional view showing a sliding bush of the present invention variable radius scroll compressor.

Figure 8 is a longitudinal cross-sectional view showing a state in which the sliding bush and the sliding bush in contact with the variable radius scroll compressor of the present invention.

9 is a perspective view showing a modified example of the sliding bush of the variable radius scroll compressor of the present invention.

10 is a longitudinal sectional view shown to explain a modification of the swing bushing of the variable radius scroll compressor of the present invention.

** Description of symbols for the main parts of the drawing **

3: turning scroll 3b: boss

4: shaft 4a: drive pin

10: sliding bush 11: pin hole

12: sliding surface 13: chamfer

20: turning bush 21: chamfer

In order to achieve the object of the present invention, the rotating scroll is coupled to the rotating shaft to form a compression space to move the position continuously between the fixed scroll and the rotational movement, when the pressure of the compression space is excessively increased gas A variable radial scroll compressor having a sliding bush which is spaced apart from a fixed scroll while the swing scroll retreats in a radial direction within a predetermined range by a force, wherein both sides of the sliding bush are provided. Provided is a friction loss reduction apparatus for a scroll compressor, characterized in that a chamfer portion is formed on at least one outer edge.

In addition, the rotating scroll is coupled to the rotating shaft to form a compression space that continuously moves the position between the fixed scroll and the rotational movement, and when the pressure in the compression space is excessively raised, the turning scroll is fixed by gas force. A sliding bush is provided between the rotating shaft and the boss of the swing scroll to retreat in the radial direction and spaced apart from the fixed scroll, and is inserted into the boss of the swing scroll to insert a swing bush between the outer periphery of the slide bush. In the scroll compressor, a chamfer is formed on at least one of the outer edge of the sliding bush or the inner edge of the swing bush facing the sliding bush.

Hereinafter, the friction loss reduction apparatus of the scroll compressor according to the present invention will be described in detail with reference to the embodiment shown in the accompanying drawings.

Figure 5 is a longitudinal sectional view showing the main portion of the variable radius scroll compressor of the present invention, Figures 6 and 7 are a perspective view and a longitudinal sectional view showing a sliding bush of the variable radius scroll compressor of the present invention.

As shown in the drawing, the friction loss reduction apparatus of the scroll compressor according to the present invention includes a swing scroll (3) which forms a pair of compression spaces (P) continuously engaged with the fixed scroll (shown in FIG. 1) 2. ), A rotation shaft 4 which is eccentrically coupled to the boss portion 3b of the turning scroll 3 to transmit the rotational force of the driving motor (not shown) to the turning scroll 3, and the driving pin portion of the rotating shaft 4 Slip bush (10) having a pin hole (11) to be inserted in the radial direction in the one direction 4a) to guide the turning scroll (3) to vary the turning radius according to the pressure change of the compression space (P), and sliding And a swing bush 20 press-fitted into the boss portion 3b of the swing scroll 3 so as to slide in the circumferential direction with the outer circumferential surface of the bush 10.

The boss portion 3b is protruded into an annular shape at the time of the back projection so as to be inserted into the rotation shaft 4 to receive the rotational force in the rear center portion of the turning scroll 3.

The rotary shaft 4 is press-fitted into the rotor of the drive motor (not shown), the upper end portion is formed to protrude eccentrically the drive pin portion 4a to be inserted into the pin hole 11 of the sliding bush 10, drive pin portion On both outer circumferential surfaces of 4a, sliding portions (shown in FIG. 2) 4b and 4b are formed by cutting parallel to the sliding surfaces 12 and 12 of the sliding bush 10 in parallel.

The sliding bush 10 forms a pin hole 11 at the center thereof so that the driving pin 4a of the rotating shaft 4 is inserted therein, and on both inner peripheral surfaces of the pin hole 11, the sliding shaft 4 is slid. The sliding surfaces 12 and 12 are formed so that the additional sliding contact is performed in a straight line.

In addition, the lower outer peripheral surface edge of the sliding bush 10 is a chamfer 13 inclined diagonally so as to narrow the outer diameter of the sliding bush 10 toward the lower end from the middle height of the outer peripheral surface of the sliding bush 10 as shown in FIG. Form.

As shown in FIG. 7, the chamfer 13 has an axial length h of less than 1/2 of the total height H of the sliding bush 10, and the radial length w of the sliding bush (10) It is preferably about 50 µm or less to form less than or equal to the gap between the outer circumferential surface and the inner circumferential surface of the turning bush 20.

The swing bush 20 is press-fitted into the boss portion 3b of the swing scroll 3 on the outer circumferential surface thereof, whereas the outer circumferential surface of the sliding bush 10 is inserted into the inner circumferential surface by sliding contact with the upper diameter and the lower diameter. It is formed in the same cylindrical shape as each other.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

The friction loss reduction device of the scroll compressor of the present invention as described above has the following effects.

That is, when the rotating shaft 4 is rotated by applying power to the driving motor (not shown), the turning scroll 3 eccentrically coupled to the rotating shaft 4 performs the turning movement along a predetermined trajectory, and in this process the turning scroll ( As the compression space formed between 3) and the fixed scroll (shown in FIG. 1) continuously moves to the center of the pivoting movement, the volume decreases to continuously suck and discharge the refrigerant gas.

At this time, since the turning scroll 3 is inclined finely to make the turning movement, the bottom of the boss portion (specifically, the inner circumferential surface of the turning bush) 3b of the turning scroll 3 is in point contact with the lower end of the outer circumferential surface of the sliding bush 10. However, as shown in FIG. 8, as shown in FIG. 8, the chamfer portion 13 is formed at the lower end of the outer circumferential surface of the sliding bush 10 so that the lower end of the inner circumferential surface of the turning bush 20 is in line contact with the lower end of the outer circumferential surface of the sliding bush 10. Due to this, the stress load concentrating on the turning bush 20 or the sliding bush 10 is widely distributed, thereby reducing the friction loss.

Moreover, as shown in FIG. 9, the chamfer 13 and 13 can also be formed in the upper and lower outer peripheral edges of the sliding bush 10 both. In this case, the upper edge of the sliding bush 10 and the inner circumferential surface of the swing bush 20 may also be in line contact with each other to distribute the stress load, thereby further reducing wear or friction loss between the two bushes 10 and 20.

On the other hand, when the sliding bush 10 is the same outer diameter in the upper and lower ends in the axial direction as shown in FIG. 10, by forming the chamfer 21 in the lower inner peripheral surface edge of the turning bush 20, the sliding bush 10 and the turning bush 20 By dispersing the stress load while the wire contact is), the wear or frictional loss between the sliding bush 10 and the swing bush 20 can be reduced accordingly. It is preferable to form the chamfer 21 of this turning bush 20 also less than 1/2 of an axial length.

The friction loss reduction device of the scroll compressor according to the present invention is provided with a chamfer on at least one of the outer edge of the sliding bush or the inner edge of the swing bush facing it, so that even if the swing scroll is tilted and turned, the boss of the scroll scroll Since the bush or swing bush is in sliding contact with the sliding bush, the wear or friction loss between both bushes can be prevented.

Claims (6)

The swinging scroll is combined with the rotating shaft to form a compression space that continuously moves its position between the fixed scroll and the rotating scroll. When the pressure of the compression space is excessively increased, the scrolling scroll is within a certain range by gas force. In the scroll compressor having a sliding bush to be spaced apart from the fixed scroll while retracting radially from the rotational shaft and the boss portion of the swing scroll, An apparatus for reducing frictional losses in scroll compressors, the chamfering portion being formed in at least one outer edge of both outer edges of the sliding bush. The method of claim 1, An axial length of the chamfer portion is a friction loss reduction device of the scroll compressor, characterized in that formed in less than 1/2 of the axial length of the sliding bush. The method of claim 1, The radial length reduction device of the scroll compressor, characterized in that the radial length of the chamfer portion is formed equal to or less than the distance between the outer peripheral surface of the sliding bush and the inner peripheral surface of the boss portion of the swing scroll. The swinging scroll is combined with the rotating shaft to form a compression space that continuously moves its position between the fixed scroll and the rotating scroll. When the pressure of the compression space is excessively increased, the swinging scroll is within a certain range by gas force. In the scroll compressor having a sliding bush to be spaced apart from the fixed scroll while retracting in a radial direction between the rotating shaft and the boss portion of the swing scroll, press-fitted into the boss portion of the swing scroll and interposed the swing bush between the outer peripheral surface of the sliding bush. , At least one of the outer edge of the sliding bush or the inner edge of the turning bush facing the bushing is provided with a chamfer portion, the friction loss reduction device of the scroll compressor. The method of claim 1, An axial length of the chamfer portion is a friction loss reduction device of the scroll compressor, characterized in that formed in less than 1/2 of the axial length of the sliding bush. The method of claim 4, wherein The radial length reduction device of the scroll compressor, characterized in that the radial length of the chamfer portion is formed equal to or less than the distance between the outer peripheral surface of the sliding bush and the inner peripheral surface of the boss portion of the swing scroll.