OIL SEPARATOR

Abstract

The present disclosure relates to an oil separator. The oil separator according to the present disclosure includes: a body having a space therein; a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space; a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; and an oil discharge pipe connected to another side of the body, and discharging oil which exists in the space. The supply pipe includes a first inner supply pipe extended from a circumferential surface of the body to an inside having the space, and a second inner supply pipe disposed in the space, disposed to be spaced apart from the circumferential surface of the body, and having a form bent in a central direction of the body.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to Korean Patent Application No. 10-2023-0110100, filed on Aug. 22, 2023. The disclosure of the prior application is incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to an oil separator, and more particularly, to an oil separator that separates oil from refrigerant discharged from a compressor.

BACKGROUND

In order to smoothly operate a compressor that compresses refrigerant, oil can be used inside the compressor. However, the oil used in the compressor can be discharged to the outside of the compressor along with the refrigerant discharged from the compressor. The oil discharged along with the refrigerant does not help the flow or a phase change of the refrigerant, and due to a problem in that the oil in the compressor is reduced, only the oil can be separated only with an oil separator, and supplied to the compressor again.

A form of the oil separator is transformed so that a separation performance of the refrigerant and the oil is increased.

Accordingly, the oil separator can have a structure in which a supply pipe that supplies the refrigerant to the inside of the oil separator is extended to the inside of a body of the oil separator. Korean Patent Registration No. 10-1340532 also discloses a structure in which the supply pipe is disposed inside the oil separator.

However, in such a structure, there is a problem in that a length of the supply pipe inserted into the inside can be limited. Further, the refrigerant discharged from the supply pipe hits an inner surface of the oil separator, which can interrupt the oil from being separated while rotating in a centrifugal direction inside the oil separator.

SUMMARY

In view of the above, the present disclosure provides an oil separator in which refrigerant and oil supplied to the oil separator are smoothly separated.

The present disclosure also provide an oil separator that minimizes an influence by friction as the refrigerant supplied to the inside of the oil separator is in contact with a circumference wall of the oil separator by a supply pipe.

The present disclosure also provide an oil separator in which a bending direction of the supply pipe may be maintained constantly inside a body.

The objects of the present disclosure are not limited to the aforementioned objects, and other objects, which are not mentioned above, will be apparent to a person having ordinary skill in the art from the following description.

In order to achieve the object, an oil separator according to an embodiment of the present disclosure includes: a body having a space therein; a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space; a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; and an oil discharge pipe connected to another side of the body, and discharging oil which exists in the space. The supply pipe includes a first inner supply pipe extended from a circumferential surface of the body to an inside having the space, and a second inner supply pipe disposed in the space, disposed to be spaced apart from the circumferential surface of the body, and having a form bent in a central direction of the body to reduce a friction degree of the refrigerant discharged from the supply pipe with an internal wall of the body.

A center of a curvature of the second inner supply pipe is disposed in the same direction as the center of the body based on the second inner supply pipe to be extended in a similar direction to the internal wall of the body disposed to be adjacent thereto.

A pipe diameter of the second inner supply pipe is formed to be smaller than a pipe diameter of the first inner supply pipe to increase a length with which the inner supply pipe is inserted into the body.

The pipe diameter of the second inner supply pipe may be formed in a size which is 0.5 times to 0.8 times of the pipe diameter of the first inner supply pipe.

A length with which the first inner supply pipe is extended in a longitudinal direction along a center of the pipe is formed to be larger than a length with which the second inner supply pipe is extended along the center of the pipe to increase the length with which the inner supply pipe is inserted into the body.

At an end portion of the second inner supply pipe, a virtual straight line extended along the center of the second inner supply pipe and a tangent line of the circumference surface of the body at a location most adjacent to the end portion of the second inner supply pipe are parallel to each other, or form an inclination angle less than 30 degrees, so refrigerant discharged through a supply hole may flow along the internal wall of the body.

The supply pipe is disposed to be spaced apart from a virtual first center line which is in line with a direction in which the supply pipe is inserted into the body, and passes through the center of the body to increase an inserted length of the inner supply pipe.

The first inner supply pipe passes through the center of the body, and extends to pass through a second center line perpendicular to the first center line to be extended up to an area adjacent to the internal wall of the body.

The second inner supply pipe may extend to pass through the first center line.

The second inner supply pipe is bent at a location passing through the second center line, and extended up to a location passing through the first center line.

An inclination angle formed by an arc formed from one end portion to the other end portion of the second inner supply pipe is formed to be larger than a right angle to supply the refrigerant in a direction which is in line with a tangent line on which the internal wall of the body disposed to be adjacent is formed.

A maximum length with which the second inner supply pipe which protrudes outwards from a circumferential surface of the first inner supply pipe may be formed to be smaller than the pipe diameter of the first inner supply pipe.

At a location where the center of the body and the center of the first inner supply pipe are most adjacent to each other, an interval by which the center of the body and the center of the first inner supply pipe are spaced apart from each other may be formed to be smaller than a half of a radius of the body.

The supply pipe further includes a connection supply pipe connecting the first inner supply pipe and the second inner supply pipe, and having a form in which a pipe diameter is reduced to change the pipe diameters of the first inner supply pipe and the second inner supply pipe.

An extended length of the connection supply pipe may be formed to be smaller than the extended length of the second inner supply pipe.

The supply pipe further includes an outer supply pipe extended outwards to the outside of the body, and a first protrusion protruding in one direction, and a second protrusion protruding in a different direction from the first protrusion are disposed on an outer circumferential surface of the outer supply pipe to maintain a degree at which the inner supply pipe is inserted into the body.

Each of the first protrusion and the second protrusion is disposed to be in contact with the circumferential surface of the body.

The first protrusion and the second protrusion are disposed in opposite directions to each other, and disposed to be spaced apart from each other in a longitudinal direction in which the outer supply pipe is extended to fix a bent direction of the second inner supply pipe.

The refrigerant discharge pipe penetrates a refrigerant discharge pipe hole formed at an upper portion of the body, and extends to the inside of the space of the body, and the supply pipe is disposed above a lower end of the refrigerant discharge pipe.

An oil separator according to the present disclosure includes: a body having a space therein; a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space; a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; and an oil discharge pipe connected to another side of the body, and discharging oil which exists in the space, and the supply pipe includes an inner supply pipe extended from a circumferential surface of the body to an inside having the space. The inner supply pipe is extended up to a location passing through a center of the body, and an end portion of the inner supply pipe forms a curved surface bent in a direction in which the center of the body is positioned at a location passing through the center of the body to reduce a fiction degree of the refrigerant supplied to the inside of the oil separator with an internal wall of the body.

Details of other exemplary embodiments will be included in the detailed description and the accompanying drawings.

According to the oil separator, there are one or more following effects.

First, there is an advantage in that the supply pipe connected to the oil separator can be deeply inserted into the oil separator.

Second, there is also an advantage in that friction of the refrigerant inserted and supplied into the oil separator with an internal wall of the oil separator can be minimized.

Third, there is also an advantage in that a bending direction in which a bent type supply pipe is disposed inside the oil separator can be maintained constant.

The effects of the present disclosure are not limited to the aforementioned effect, and other effects, which are not mentioned above, will be apparent to a person having ordinary skill in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a heat pump system including an oil separator and a compressor according to an embodiment of the present disclosure.

FIG. 2 is a perspective view of the oil separator according to an embodiment of the present disclosure.

FIG. 3 is a front view of a body of the oil separator according to an embodiment of the present disclosure.

FIG. 4 is one side view of a supply pipe of the oil separator according to an embodiment of the present disclosure.

FIG. 5 is a diagram for describing a layout relationship of the body and the supply pipe of the oil separator according to an embodiment of the present disclosure.

FIG. 6 is a diagram according to a comparative example of the oil separator according to the present disclosure.

FIG. 7 illustrates data acquired by comparing the oil separator of the present disclosure and the oil separator according to the comparative example of FIG. 6.

FIG. 8 is a diagram illustrating an oil separator according to another embodiment of the present disclosure.

DETAILED DESCRIPTION

Advantages and features of the present disclosure, and methods for accomplishing the same will be more clearly understood from embodiments described in detail below with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, and may be embodied in various different forms. The present embodiments are just for rendering the disclosure of the present disclosure complete and are set forth to provide a complete understanding of the scope of the present disclosure to a person with ordinary skill in the technical field to which the present disclosure pertains, and the present disclosure ill only be defined by the scope of the claims. Throughout the whole specification, the same reference numerals denote the same elements.

Hereinafter, the present disclosure will be described with reference to drawings for describing an air conditioner and an oil separator according to embodiments of the present disclosure.

Referring to FIG. 1, the air conditioner may include a compressor 2 compressor refrigerant, an oil separator 10 separating oil from the refrigerant discharged from the compressor 2, and supplying the oil to the compressor again, and an accumulator 4 supplying gas phase refrigerant to the compressor 2.

The compressor 2 may compresses the gas phase refrigerant, and discharge the compressed gas phase refrigerant in a high-temperature high-pressure state. The compressor 2 uses the oil in order to smoothly operate internal components, so the refrigerant discharged from the compressor 2 may include the oil. However, the oil included in the refrigerant discharged from the compressor 2 may influence a phase change of the refrigerant, etc. Further, when the oil included in the refrigerant discharged from the compressor 2 continuously escapes, there is a risk damaging the operation of the compressor 2, so the oil included in the refrigerant discharged from the compressor 2 may be separated through the oil separator 10, and supplied to the compressor 2.

The oil separator 10 may separate the oil from the refrigerant discharged from the compressor 2, and supply the refrigerant to a heat exchanger (not illustrated), and supply the oil to the compressor 2.

An accumulator 4 may supply only the gas phase refrigerant in the refrigerant supplied to the compressor 2 to the compressor 2.

Hereinafter, the oil separator according to an embodiment of the present disclosure will be described with reference to FIGS. 2 to 5.

The oil separator 10 includes a body 12 forming a space 12a therein, a refrigerant discharge pipe 20 connected to one side of the body 12, and discharging the refrigerant which exists in the space 12a of the body 12, a supply pipe 40 which is connected to the other side of the body 12, and into which the refrigerant including the oil discharged from the compressor 2 flows, and an oil discharge pipe 30 connected to another side of the body 12, and discharging the oil which exists in the space 12a of the body 12.

The body 12 may be formed in a cylindrical shape. The body 12 has the space 12a storing the refrigerant or oil formed therein. The body 12 may be formed in a form in which an upper side and a lower side are convex.

A refrigerant discharge pipe hole 14 penetrated by the refrigerant discharge pipe 20 is formed on an upper end portion of the body 12. An oil discharge pipe hole 16 connected to the oil discharge pipe 30 is formed on a lower end portion of the body 12. A supply pipe hole 18 penetrated by the supply pipe 40 is formed on a circumferential surface portion of the body 12.

The refrigerant discharge pipe 20 has a structure of penetrating the refrigerant discharge pipe hole 14 formed in the body 12, and extending to an internal lower side of the body 12. A lower end of the refrigerant discharge pipe 20 is positioned below the supply pipe 40 disposed in the body 12.

The refrigerant discharge pipe 20 has a structure of extending in vertical direction in the space 12a of the body 12. The refrigerant discharge pipe 20 extends downwards from the refrigerant discharge pipe hole 14 of the body 12.

The refrigerant discharge pipe 20 includes an inner refrigerant discharge pipe 22 disposed in the space 12a of the body 12, and an outer refrigerant discharge pipe 24 disposed outside the body 12. A refrigerant discharge pipe protrusion 26 fixing a location of the refrigerant discharge pipe 20 disposed in the body 12 is disposed on a lower end of the outer refrigerant discharge pipe 24.

The refrigerant discharge pipe protrusion 26 may limit a length with which the refrigerant discharge pipe 20 is inserted into the body 20. The refrigerant discharge pipe protrusion 26 may make a location at which the refrigerant discharge pipe 20 is mounted on the body 12 constant. When the refrigerant discharge pipe 20 is inserted into the refrigerant discharge pipe hole 14 of the body 12, a mounting location of the refrigerant discharge pipe 20 on the body 12 may be fixed by catching the refrigerant discharge pipe 20 on the refrigerant discharge pipe protrusion 26.

While the refrigerant discharge pipe 20 is mounted on the body 12, the refrigerant discharge pipe 20 may be coupled the body 12 by a method such as welding, etc. While the refrigerant discharge pipe 20 is mounted on the body 12, contact portions of the refrigerant discharge pipe 20 and the body 12 may be welded.

The oil discharge pipe 30 may have a bent form. The oil discharge pipe 30 may be coupled to the body 12 at a lower end portion of the body '12. The oil discharge pipe 30 may have a structure in which a portion connected at the lower end portion of the body 12 is bent and extended upwards.

The supply pipe 40 may include an outer supply pipe 42 disposed outside the body 12, and an inner supply pipe 50 disposed in the space 12a of the body 12.

The outer supply pipe 42 is extended outwards on a circumferential surface of the body 12. The outer supply pipe 42 may have a structure of being extended outwards on the circumferential surface of the body 12, and bent at a location spaced from the body 12 by a predetermined interval. Referring to FIG. 2, the outer supply pipe 42 has a structure of being bent upwards at the location spaced apart from the body 12 by the predetermined interval.

A first protrusion 44 protruding in one direction, and a second protrusion 46 protruding in a different direction from the first protrusion 44 are disposed on an outer circumferential surface of the outer supply pipe 42. The second protrusion 46 may be disposed in an opposite direction to the first protrusion 44.

The first protrusion 44 protrudes in a direction in which a second inner supply pipe 54 to be described below is bent. The second protrusion 46 is disposed on an opposite surface of the outer supply pipe 42 in which the first protrusion 44 is disposed. The first protrusion 44 and the second protrusion 46 are disposed in opposite directions to each other, and disposed to be spaced apart from each other in a longitudinal direction in which the outer supply pipe 42 is extended.

Each of the first protrusion 44 and the second protrusion 46 is disposed to be in contact with the circumferential surface of the body 12. The inner supply pipe 50 disposed inside the body 12 may be accurately disposed by the first protrusion 44 and the second protrusion 46. Each of the first protrusion 44 and the second protrusion 46 may make the inner supply pipe 50 disposed in the space 12a of the body 12 be constantly disposed.

Referring to FIG. 3, the inner supply pipe 50 includes a first inner supply pipe 52 extended to the inside of the space 12a from the circumferential surface, and a second inner supply pipe 54 disposed to be spaced apart from the circumferential surface of the body 12, and having the bent form. Further, the inner supply pipe 50 includes a connection supply pipe 56 connecting the first inner supply pipe 52 and the second inner supply pipe 54.

The first inner supply pipe 52 has a structure of a straight-line pipe. A pipe diameter 52d of the first inner supply pipe 52 is formed to be larger than a pipe diameter 54d of the second inner supply pipe 54. The pipe diameter 54d of the second inner supply pipe 54 may be formed with a size of 0.5 times to 0.8 times of the pipe diameter 52d of the first inner supply pipe 52.

The second inner supply pipe 54 has a bent structure. A length 521 with which the first inner supply pipe 52 is extended along a center of the pipe may be formed to be larger than a length 541 with which the second inner supply pipe 54 is extended along the center of the pipe.

A maximum length L1 with which the second inner supply pipe 54 protrudes outwards from the circumferential surface of the first inner supply pipe 52 is formed to be smaller than the pipe diameter 52d of the first inner supply pipe 52.

An extended length 561 of the connection supply pipe 56 is formed to be smaller than the extended length 541 of the second inner supply pipe 54.

Referring to FIG. 5, placement of the supply pipe 40 connected to the body 12 is described.

The supply pipe 40 may be inserted into the supply pipe hole 18 formed on the circumferential surface of the body 12. The supply pipe 40 may be inserted in to a point of the circumferential surface of the body 12 into which the supply pipe 40 is inserted through the supply pipe hole 18 at an inclination angle between a normal line and a tangent line of the circumferential surface at an insertion point of the body 12.

The supply pipe 40 is disposed to be spaced apart from a virtual first center line CL1 which is in line with the direction in which the supply pipe 40 is inserted into the body 12, and passes through the center of the body 12. The supply pipe 40 is perpendicular to the direction in which the supply pipe 40 is inserted, and disposed to pass through a virtual second center line CL2 passing through the center of the body 12 inside the body 12.

The supply pipe 40 has a structure of being bent in the direction of the first center line CL1 at a location passing through the virtual second center line CL2 inside the body 12. The supply pipe 40 is disposed to sequentially pass through the second center line CL2 and the first center line CL1 inside the body 12.

An inclination angle θ1 between a virtual straight line IL extended from the center of the body 12 to the center of the supply pipe hole 18, and a straight line 52IL in which the first inner supply pipe 52 is extended along the center of the pipe may form an acute angle.

A center point 18c of the supply pipe hole 18 may be disposed to be spaced apart from a circumferential point of the body 12 at which a normal line formed in line with the extended direction of the supply pipe 40 is disposed.

At a location where a center 12c of the body 12 and a center of the first inner supply pipe 52 are most adjacent to each other, an interval L2 at which the center 12c of the body 12 and the center 52c of the first inner supply pipe 52 are spaced apart from each other may be formed to be smaller than a half of a radius 12R of the body 12.

At the center 12c of the body 12, an interval L2 between the supply pipe holes 18 spaced apart from each other in the direction of the second center line CL2 to be described below may be formed to be smaller than a half of the radius 12R of the body 12.

At the location where the center 12c of the body 12 and the center of the first inner supply pipe 52 are most adjacent to each other, the refrigerant discharge pipe 20 and the first inner supply pipe 52 are disposed to be spaced apart from each other.

The length 52L with which the first inner supply pipe 52 is extended in a space of the body 12 may be formed to be equal to or larger than the radius 12R of the body 12. An end portion 53a of the first inner supply pipe 52 may be extended up to a location passing through the center of the body 12 based on the extended direction of the first inner supply pipe 52. The end portion 53a of the first inner supply pipe 52 may be extended up to a location passing through the second center line CL2.

At an end portion 55a of the second inner supply pipe 54, a virtual straight line 55al extended along a center of the second inner supply pipe 54, and a tangent line Tl of the circumferential surface of the body 12 at a location adjacent to the end portion 55a of the second inner supply pipe 54 may be parallel to each other, or may form an inclination angle less than 30 degrees.

An inclination angle θ2 formed by an arc formed from one end portion to the other end portion of the second inner supply pipe 54 may be formed to be larger than a right angle.

Referring to FIG. 5 the end portion 55a of the second inner supply pipe 54 is extended up to a location passing through the first center line CL1. The second inner supply pipe 54 is bent at the location passing through the second center line CL2, and extended up to the location passing through the first center line CL1.

The center 12c of the body 12 which is a center of a curvature of the circumferential surface of the body 12 is disposed in a direction in which a center cc of a curvature of the second inner supply pipe 54 is disposed based on the second inner supply pipe 54.

Referring to FIG. 6, supply pipe structures according to the present disclosure and a comparative example are described. Since a form of the supply pipe according to FIG. 6 is the same as an overall pipe diameter of the inner supply pipe, a length with which the supply pipe 40 may be inserted into the body 12 may be limited. Further, since the supply pipe 40 is inserted into the circumferential surface of the body 12 in a normal-line direction, the length with which the supply pipe 40 may be inserted into the body 12 may be limited.

Referring to FIG. 6, based on the supply pipe 40 bent inside the body 12, a center cc of a curvature of the bent supply pipe 40 is disposed in an opposite direction to the center 12c of the body 12.

In such a structure, refrigerant discharged from the supply pipe 40 collides with the inside of the circumferential surface of the body 12, and a mixing effect of oil and the refrigerant increases, so efficiency of oil separation may deteriorate.

Referring to FIG. 7, it can be seen that compared to the comparative example according to FIG. 6, in the structure of the present disclosure, the oil separation efficiency increases in an overall area regardless of a frequency change of the compressor 2. In particular, it can be seen that the oil separation efficiency increases by 30% or more in an area where a frequency of the compressor 2 is low.

Referring to FIG. 8, an oil separator 10 according to another embodiment of the present disclosure is described.

Referring to FIG. 8, the oil separator 10 includes a body 12, a refrigerant discharge pipe 20, a supply pipe 40, and an oil discharge pipe 30.

The supply pipe 40 may be inserted into the body 12 in a direction not heading to a center of the body 12. The supply pipe 40 includes an inner supply pipe 50 inserted into the body 12. The inner supply pipe 50 is extended up to a location passing through the center 12c of the body 12.

In the oil separator 10, an end portion of the inner supply pipe 50 is disposed at the location passing through the center 12c of the body 12. The end portion of the inner supply pipe 50 may have a curved surface shape in which the end portion is bent in a central direction of the body 12. Accordingly, in respect to refrigerant which flows along the inner supply pipe 50, a flow direction of the refrigerant may be changed at the end portion of the inner supply pipe 50. Further, the flow direction of the refrigerant is changed at the end portion of the inner supply pipe 50, so a friction amount of the refrigerant discharged from the inner supply pipe 50 with an internal wall of the body 12 may be reduced.

A supply hole 50a is formed at the end portion of the inner supply pipe 50. A direction headed by the supply hole 50a may be formed to be inclined to an extended direction of the inner supply pipe 50. The direction headed by the supply hole 50a may form an inclination angle of approximately 60 to 12 degrees with the extended direction of the inner supply pipe 50. Referring to FIG. 8, the direction headed by the supply hole 50a may be formed to be perpendicular to the extended direction of the inner supply pipe 50.

A guide all 57 protruding to the inside of the inner supply pipe 50 from an area adjacent to the supply hole 50a is disposed inside the inner supply pipe 50. The guide wall 57 may reduce a flow friction which may occur as the flow direction of the refrigerant is changed at the end portion of the inner supply pipe 50.

The guide wall 57 includes a first guide wall 57a in which a protruding height increases in a direction adjacent to the supply hole 50a, and a second guide all 57b positioned between the supply hole 50a and the first guide wall 57a.

A length 57aL with which the first guide wall 57a is formed in the extended direction of the inner supply pipe 50 may be formed to be larger than a length 57bL with the second guide wall 57b is formed in the extended direction of the inner supply pipe 50.

While the embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the aforementioned specific embodiments, various modifications may be made by a person with ordinary skill in the technical field to which the present disclosure pertains without departing from the subject matters of the present disclosure that are claimed in the claims, and these modifications should not be appreciated individually from the technical spirit or prospect of the present disclosure.

Claims

1. An oil separator comprising: a body having a space therein;a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space;a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; andan oil discharge pipe connected to another side of the body, and discharging oil which exists in the space,wherein the supply pipe includesa first inner supply pipe extended from a circumferential surface of the body to an inside having the space, anda second inner supply pipe disposed in the space, disposed to be spaced apart from the circumferential surface of the body, and having a form bent in a central direction of the body.

2. The oil separator of claim 1, wherein a center of a curvature of the second inner supply pipe is disposed in the same direction as the center of the body based on the second inner supply pipe.

3. The oil separator of claim 1, wherein a pipe diameter of the second inner supply pipe is formed to be smaller than a pipe diameter of the first inner supply pipe.

4. The oil separator of claim 1, wherein the pipe diameter of the second inner supply pipe is formed in a size which is 0.5 times to 0.8 times of the pipe diameter of the first inner supply pipe.

5. The oil separator of claim 1, wherein a length with which the first inner supply pipe is extended in a longitudinal direction along a center of the pipe is formed to be larger than a length with which the second inner supply pipe is extended along the center of the pipe.

6. The oil separator of claim 1, wherein at an end portion of the second inner supply pipe, a virtual straight line extended along the center of the second inner supply pipe and a tangent line of the circumference surface of the body at a location most adjacent to the end portion of the second inner supply pipe are parallel to each other, or form an inclination angle less than 30 degrees.

7. The oil separator of claim 1, wherein the supply pipe is disposed to be spaced apart from a virtual first center line which is in line with a direction in which the supply pipe is inserted into the body, and passes through the center of the body.

8. The oil separator of claim 7, wherein the first inner supply pipe passes through the center of the body, and extends to pass through a second center line perpendicular to the first center line.

9. The oil separator of claim 8, wherein the second inner supply pipe extends to pass through the first center line.

10. The oil separator of claim 8, wherein the second inner supply pipe is bent at a location passing through the second center line, and extended up to a location passing through the first center line.

11. The oil separator of claim 1, wherein an inclination angle formed by an arc formed from one end portion to the other end portion of the second inner supply pipe is formed to be larger than a right angle.

12. The oil separator of claim 1, wherein a maximum length with which the second inner supply pipe which protrudes outwards from a circumferential surface of the first inner supply pipe is formed to be smaller than the pipe diameter of the first inner supply pipe.

13. The oil separator of claim 1, wherein at a location where the center of the body and the center of the first inner supply pipe are most adjacent to each other, an interval by which the center of the body and the center of the first inner supply pipe are spaced apart from each other is formed to be smaller than a half of a radius of the body.

14. The oil separator of claim 1, wherein the supply pipe further includes a connection supply pipe connecting the first inner supply pipe and the second inner supply pipe, and having a form in which a pipe diameter is reduced.

15. The oil separator of claim 14, wherein an extended length of the connection supply pipe is formed to be smaller than the extended length of the second inner supply pipe.

16. The oil separator of claim 1, wherein the supply pipe further includes an outer supply pipe extended outwards to the outside of the body, and a first protrusion protruding in one direction, and a second protrusion protruding in a different direction from the first protrusion are disposed on an outer circumferential surface of the outer supply pipe.

17. The oil separator of claim 16, wherein each of the first protrusion and the second protrusion is disposed to be in contact with the circumferential surface of the body.

18. The oil separator of claim 16, wherein the first protrusion and the second protrusion are disposed in opposite directions to each other, and disposed to be spaced apart from each other in a longitudinal direction in which the outer supply pipe is extended.

19. The oil separator of claim 1, wherein the refrigerant discharge pipe penetrates a refrigerant discharge pipe hole formed at an upper portion of the body, and extends to the inside of the space of the body.

20. An oil separator comprising: a body having a space therein;a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space;a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; andan oil discharge pipe connected to another side of the body, and discharging oil which exists in the space,wherein the supply pipe includes an inner supply pipe extended from a circumferential surface of the body to an inside having the space,the inner supply pipe is extended up to a location passing through a center of the body, andan end portion of the inner supply pipe forms a curved surface bent in a direction in which the center of the body is positioned at a location passing through the center of the body.