KR100738712B1 - Oil feeding structure of scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor, and more particularly, to an oil supply structure of a scroll compressor for stably supplying oil for lubrication of the scroll compression unit.

The oil supply structure of the scroll compressor according to the present invention includes a lower frame in which a hole of a predetermined size is formed; A gear part including an outer gear inserted into the hole and an inner gear rotating inside the outer gear; And an elastic member interposed on an outer circumferential surface of the outer gear to press the outer gear.

According to the oil supply structure of the scroll compressor according to the present invention, even if foreign matter is interposed between the inner gear and the outer gear of the oil pump composed of the inner gear and the outer gear, there is an effect that the oil pump operates normally.

Inner gear, outer gear, leaf spring

Description

Oil feeding structure of scroll compressor

1 is a cross-sectional view of a scroll compressor to which the oil supply structure of the scroll compressor according to the present invention is applied.

Figure 2 is a plan view showing a fixed scroll and a rotating scroll to perform the refrigerant compression process of the scroll compressor according to the present invention.

3 is an exploded perspective view showing an oil supply device according to the present invention.

Figure 4 is a perspective view showing a state in which the gear portion is inserted into the lower frame according to the present invention

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

121: outer gear 124: inner gear

125: leaf spring

The present invention relates to a compressor, and more particularly, to an oil supply structure of a scroll compressor for stably supplying oil for lubrication of the scroll compression unit.

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 form is commonly used when high pressures are required rather than flow rates. In addition, the dynamic compressor is a device that increases the pressure of the gas by the momentum due to the large flow velocity obtained by rotating the rotor at a very high speed, which 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.

On the other hand, the conventional low pressure scroll compressor includes a drive unit consisting of a rotor and a stator. And a drive shaft which rotates together as the rotor of the drive unit rotates, an eccentric portion is formed on the upper portion, an upper frame fitted to the upper side of the drive shaft, and a suction pipe for allowing fluid to flow from the outside.

In addition, a swing scroll positioned above the upper frame and compressing the refrigerant sucked through the suction pipe by a swinging movement, a fixed scroll engaged with the swinging scroll and fixed to an upper side of the upper frame, and the swinging scroll is fixed. A scroll compression unit including an old dam ring for turning in the scroll and a discharge tube through which the refrigerant compressed in the fixed scroll is discharged to the outside are included.

In addition, an oil supply passage is formed inside the drive shaft, and includes an oil supply unit for pumping oil into the oil supply passage.

In detail, the oil supply part is inserted into the lower frame, the lower frame, the inner gear is coupled to the drive shaft and rotated with the rotation of the drive shaft, the outer gear inserted into the lower frame, the lower side of the lower frame Included is a cover coupled to.

The refrigerant compression action of the scroll compressor by the above configuration will be briefly described.

First, the low pressure refrigerant, which has undergone expansion, is introduced through the suction pipe, some of the introduced refrigerant moves to the scroll compression unit, and some moves to the lower portion of the compressor. In addition, the high pressure refrigerant compressed by the scroll compressor is discharged to the outside of the compressor through the discharge pipe.

In addition, while the compression process is performed as described above, the oil and refrigerant stored in the inner lower chamber of the compressor are pumped by an oil supply unit including an inner gear that is rotated at the same time as the drive shaft rotates and an outer gear that is in close contact with the lower frame. . And the pumped oil is pushed upward through the oil supply passage formed in the drive shaft. Then, the oil pushed up through the oil supply passage penetrates into the friction part of the scroll compression part, thereby lubricating the contact surface.

On the other hand, the conventional oil supply device has a structure in which the outer gear is in close contact with the lower frame. By this structure, when the inner gear is rotated, there is a problem that the oil pump does not operate normally because foreign matter is caught between the inner gear and the outer gear.

The present invention has been proposed to solve the above problems, even if foreign matter interposed between the inner gear and the outer gear of the oil pump consisting of the inner gear and the outer gear, the oil supply structure of the scroll compressor to operate the oil pump normally To provide for that purpose.

The oil supply structure of the scroll compressor according to the present invention for achieving the object as described above is the lower frame is formed a hole of a predetermined size; A gear part including an outer gear inserted into the hole and an inner gear rotating inside the outer gear; And an elastic member interposed on an outer circumferential surface of the outer gear to press the outer gear.

According to the oil supply structure of the scroll compressor according to the present invention, even if foreign matter is interposed between the inner gear and the outer gear of the oil pump composed of the inner gear and the outer gear, there is an effect that the oil pump operates normally.

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 other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

1 is a cross-sectional view of a scroll compressor to which the oil supply structure of the scroll compressor according to the present invention is applied.

Referring to FIG. 1, a scroll compressor 1 to which an oil supply device of a scroll compressor according to the present invention is applied includes a casing 10, a suction part through which fluid is sucked from the outside, and a fluid sucked from the suction part. A scroll compressor, a discharge part through which the high pressure fluid compressed by the scroll compressor is discharged, an oil supply device 100 for pumping oil stored in the oil storage part 12 formed under the casing 10; It includes a drive unit for generating a rotational force by the magnetic interaction of the stator and the rotor.

In detail, the suction part includes a suction pipe 84 formed at one side of the outer circumferential surface of the casing 10, and a suction chamber 82 communicating with the suction pipe 84 and accumulating refrigerant introduced therein. And, a part of the introduced refrigerant is introduced into the scroll compression unit to be described later is compressed.

In addition, the discharge portion is formed in the center portion of the fixed scroll 60, the discharge port 92 for communicating the compressed refrigerant and the discharge port 92, is formed on the uppermost side of the casing 10 And a discharge tube 96 formed on one side surface of the discharge chamber 94.

Hereinafter, the operation of the scroll compressor 1 according to the present invention will be described.

First, when a drive motor 20 including the stator 21 and the rotor 22 is operated as an external power source is applied, the drive shaft 30 coupled to the rotor 22 rotates. As the drive shaft 30 rotates as described above, the refrigerant is sucked through the suction pipe 84. The sucked refrigerant flows into the suction chamber 82 and flows into the scroll compression unit.

Next, the refrigerant flowing into the scroll compression unit is compressed to a high pressure while being collected at the center of the scroll by the swinging movement of the swing scroll 50. The high pressure refrigerant is moved to the discharge chamber 94 through the discharge port 92.

Finally, the high pressure refrigerant moved to the discharge chamber 94 is discharged to the outside of the scroll compressor 1 through the discharge tube 96.

The scroll compression unit is inserted into an upper portion of the drive shaft 30 to support the drive shaft 30 and the upper frame 40 to compress the refrigerant sucked through the suction pipe 84. The swing scroll 50 supported by the upper side, the fixed scroll 60 engaged with the swing scroll 50 and fixed to the upper side of the upper frame 40 by fastening means, and the swing scroll 50 are Old dam ring (not shown in the figure) for turning within the fixed scroll 60, a fixed scroll wrap 62 formed in a spiral shape below the fixed scroll 60, and the swing scroll ( Spiral scroll wrap 52 formed in a spiral shape on the upper side of 50, and inserted 180 degrees to the fixed scroll wrap 62, discharge port 92 formed in the inner center of the fixed scroll wrap 62 ) Is included.

2 is a plan view illustrating a fixed scroll and a swing scroll for performing a refrigerant compression process of the scroll compressor according to the present invention.

Referring to the process of compressing the refrigerant by the configuration as described above, first, the swinging scroll 50 is eccentric with respect to the drive shaft 30 to swing (idle). In addition, the pivoting scroll 50 is pivoted by the rotation of the drive shaft 30 with respect to the fixed scroll 60, so that each of the scroll wraps 52 and 62 causes surface contact to compress the refrigerant. ) Is formed. This pocket 70 rotates into the center of the scroll wrap 52, 62, and the volume thereof becomes smaller. The inside of the pocket 70 in which the volume is reduced becomes a high pressure state. Therefore, the refrigerant present in the pocket becomes a high pressure refrigerant and is discharged to the discharge chamber 94 through the discharge port 92.

In addition, the driving unit is a stator 21 and a drive motor 20 formed of a rotor 22 located inside the stator 21 and rotated by being inserted into a center of the rotor 21. A drive shaft 30 for transmitting rotational force to the scroll 50 and the oil supply device 30 is included. In detail, the drive shaft 30 is fixed coaxially to the rotor 21. And the crankshaft 33 which is eccentric by a predetermined amount with respect to the axis of the said drive shaft 30 is included in the front-end | tip of the said drive shaft 30. As shown in FIG. In addition, an oil supply passage 32 for guiding lubricating oil to the front end of the crankshaft 33 is eccentrically drilled in the drive shaft 30. The eccentric drilled oil supply passage 32 allows the lubricating oil to rise by the centrifugal force when the drive shaft 30 rotates at a high speed.

3 is an exploded perspective view showing an oil supply device according to the present invention.

Referring to FIG. 3, the oil supply device 100 according to the present invention is positioned in the oil reservoir 12 at the lower side of the casing 10, and the lower frame 110 in which the drive shaft 30 is inserted through the center thereof. ), A lower portion of the lower frame 110, a gear part 120 that is rotated together when the driving shaft 30 rotates, and an oil supply device cover 130 coupled to the lower side of the lower frame 110. ) Is included.

In detail, oil is generally stored in the oil reservoir 12. The oil penetrates into the bearing surface formed on the lower surface of the turning scroll 50 and the bearing surface formed on the upper surface of the upper frame 40 to lubricate. And acts as a cooling medium to cool the drive unit and the compression unit.

In addition, the drive shaft 30 is formed with a predetermined diameter and length, the oil supply passage 32 which serves as a passage for the pumped oil flows to the scroll compression unit is formed through the vertical direction. In addition, a gear driving part 34 inserted into the inner gear 124 to allow the gear part 120 to rotate is formed below the driving shaft 30 so as to be smaller than the diameter of the driving shaft 30.

In addition, the gear driving unit 34 is formed with a guide groove 35 to allow oil to smoothly flow along the outer circumferential surface. In addition, an oil inlet hole 36 is formed on the guide groove 35 so as to communicate with the oil supply passage 32 through a horizontal direction. Therefore, after the oil flows in the horizontal direction through the oil inflow hole 36, the oil rises in the vertical direction along the oil supply passage 32.

On the other hand, the lower frame 110 serves as a body of the gear unit 120. In addition, the lower frame 110 is recessed and molded to a predetermined depth into the drive shaft insertion groove 112 into which the drive shaft 30 is inserted, and is formed to have a size corresponding to the outer diameter of the drive shaft 30. In addition, a plate seating portion 114 on which the friction reducing plate 140 is seated is formed on a bottom surface of the driving shaft insertion groove 112.

Here, the friction reducing plate 140 serves to reduce the friction between the drive shaft 30 and the lower frame 110 during the rotation of the drive shaft (30).

In addition, the friction reducing plate 140 has a fixing part 142 which is fixed to the lower frame 110 in a state of being seated on the plate seating part 114 to protrude in a lateral direction, and the lower frame 110. ) Is formed with a fixing hole 115 to be fixed to the fixing portion 142 is inserted.

In addition, the drive shaft insertion groove 112 is formed with a gear driving unit through-hole 116 through which the gear driving unit 34 is inserted.

4 is a trial showing a state in which the gear portion is inserted into the lower frame according to the present invention.

Referring to FIG. 4, the lower frame 110 according to the present invention has a radius larger than the radius of the gear part 120 and is recessed to a predetermined depth, and the gear part insertion groove 118 and the gear part insertion groove ( A spring 125 inserted into the gear part 120 including the inner gear 124 and the outer gear 122 and interposed between the gear part 120 and the inner circumferential surface of the gear part insertion groove 118. This includes.

In detail, the gear part 120 is inserted into the gear part insertion groove 118 to be seated. At this time, a predetermined space is formed between the outer circumferential surface of the gear unit 120 and the inner circumferential surface of the gear insertion groove 118. In addition, the gear part 120 has a hollow, an outer gear 122 having an outer gear tooth 121 formed on an inner circumferential surface, and an inner gear tooth 123 formed on an outer circumferential surface thereof, and the outer gear 122 Inner gear 124 is inserted into the included.

Here, the hollow of the outer gear 122 is formed eccentrically. That is, when the inner gear 124 is inserted into the outer gear 122, the inner gear teeth 123 of the inner gear 124 and the outer gear teeth 121 of the outer gear 122 are not completely engaged. As a result, a plurality of predetermined chambers 126 are formed. Here, the chamber 126 serves to pump the oil. Therefore, when the gear unit 120 is rotated while the oil is introduced into the chamber 126, the pumping of the oil is possible by the rotational pressure.

In addition, an elastic member 125 is formed on the outer circumferential surface of the outer gear 122 to press the inner circumferential surface of the gear part insertion groove 118. The elastic member 125 has a ring shape having a polygon. In detail, a plurality of leaf springs curved at a predetermined curvature are connected at each end to each other to form a ring shape. More specifically, the elastic member 125 allows the gear part 120 to be positioned at the center of the gear part insertion groove 118 in normal times. On the other hand, when this material is interposed between the inner gear teeth 123 and the outer gear teeth 121, the gear part 120 enables eccentricity at the center of the gear part insertion groove 118. . When the foreign matter is removed, the gear unit 120 may be returned to its original position.

On the other hand, the oil supply device cover 130 is coupled by fastening the screw to the lower side of the lower frame (110). And as the oil supply device cover 130 is fastened in a state in which the gear part 120 is inserted into the lower frame 110, the oil supply device cover 130 serves as a lower cover of the gear part 120. Done.

In addition, the gear unit 120 is configured of the outer gear 122 and the inner gear 124 as described above. And the outer side of the inner gear 124 and the inner side of the outer gear 122 is configured to mesh with each other, the inner gear 124, the gear drive unit 34 is inserted, the outer gear 122 is the lower frame It is inserted into the gear insertion groove 118 of the (110). In addition, the outer circumferential surface of the outer gear 122 is formed with an elastic member 125 for pressing the inner circumferential surface of the gear insertion groove 118.

Hereinafter, a process in which oil is pumped by the gear unit 120 by the above-described configuration will be described.

First, when the driving shaft 30 is rotated while oil is sucked into the chamber 126 formed between the inner gear 124 and the outer gear 122 through the inlet 132 of the pump cover 130. In addition, the outer gear 122 is rotated together with the rotation of the inner gear 124 coupled with the gear driver 34. That is, the inner gear teeth 123 of the inner gear 124 are rotated by the outer gear teeth 121 of the outer gear 122, and the outer gear 122 is rotated by the inner gear 124. ) Are rotated together.

As the inner gear 124 and the outer gear 122 are rotated, the oil in the chamber 126 moves toward the discharge port of the pump cover 130. Then, the oil is dropped into the discharge port, the dropped oil is introduced through the oil inlet hole 36 of the drive shaft (30). In addition, the oil introduced into the oil inlet hole 36 may rise along the oil supply passage 32 to be supplied to the scroll compression unit.

On the other hand, when foreign matter is introduced into the suction port 132 is interposed between the outer gear teeth 121 and the inner gear 123, the outer gear 122 presses the elastic member 125 and the gear unit It is pushed outward from the center of the 120. Therefore, a gap is formed between the outer gear teeth 121 and the inner gear teeth 123, so that the foreign matter is pushed out. In addition, the elastic member 125 presses the outer gear 122 so that the outer gear 122 can be returned to its original position. By doing so, the operation of the gear unit 120 is made smoothly.

According to the oil supply structure of the scroll compressor according to the present invention as described above, even if foreign matter interposed between the inner gear and the outer gear of the oil pump consisting of the inner gear and the outer gear, there is an effect that the oil pump operates normally.

In addition, the normal operation of this oil pump ensures the reliability of the scroll compressor to improve the compression capacity.

Claims (4)

A lower frame in which holes of a predetermined size are formed; A gear part including an outer gear inserted into the hole and an inner gear rotating inside the outer gear; And an elastic member interposed on an outer circumferential surface of the outer gear and pressurizing the outer gear. The method of claim 1, The elastic member is an oil supply structure of the scroll compressor, characterized in that the polygonal leaf spring. The method of claim 1, The gear supply oil supply structure of the scroll compressor, characterized in that at least one inner gear teeth are formed on the outer peripheral surface of the inner gear and at least one outer gear teeth are formed on the inner peripheral surface of the outer gear. The method of claim 3, wherein And said gear portion is formed such that said inner gear teeth and said outer gear teeth are formed to have a predetermined gap therebetween.

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