JP2014145497A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil separator which increases a surface area where a lubrication oil separated from a refrigerant flows when the refrigerant flows in a container.SOLUTION: An oil separator 30 is used for separating a lubrication oil flowing with a refrigerant from the refrigerant and comprises: a container body 31; an inlet pipeline 22 which is connected with the container body 31; and an outlet pipeline 23 which is connected with the container body 31. Three or more passages which head to the container body 31 and are divided from each other are formed in the inlet pipeline 22.

Description

  The present invention relates to an oil separator.

  Conventionally, in a refrigeration apparatus, an oil separator is used together with a compressor or the like in order to separate the lubricating oil flowing so as to accompany the refrigerant from the refrigerant.

  As such an oil separator, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 05-312438), the inlet pipe is connected along the tangential direction of the substantially cylindrical container body. A structure has been proposed in which lubricating oil is allowed to flow along the inner peripheral surface of the container body to facilitate separation of the lubricating oil from the refrigerant.

  The inlet pipe of this oil separator is provided with an outer pipe constituting the outer side and an inner pipe provided on the inner side, thereby adopting a double pipe structure. Among these, the inner tube extends so as to connect the flow path center on the upstream side of the outer tube and the downstream side of the outer tube and near the center of the substantially cylindrical container body. In this way, it has been proposed that the refrigerant can flow mainly through the inner pipe and the lubricating oil can flow along the inner surface of the outer pipe so that the refrigerant and the lubricating oil can be easily separated.

  Here, in the oil separator described in Patent Document 1 (Japanese Patent Laid-Open No. 05-31438) described above, a double pipe structure is adopted for the inlet pipe, but in this example, the lubricating oil is allowed to follow. Only the inner and outer peripheral surfaces of the inner tube and the inner peripheral surface of the outer tube can be formed.

  Moreover, in the oil separator, the refrigerant and the lubricating oil can be easily separated by devising the connection form of the substantially cylindrical container body and the inlet pipe, but the surface area for allowing the lubricating oil to follow is increased. It has not been studied at all to secure and facilitate separation of the lubricating oil from the refrigerant.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an oil separation capable of increasing the surface area along which the lubricating oil separated from the refrigerant is allowed to flow when the refrigerant flows into the container. Is to provide a vessel.

  An oil separator according to a first aspect is an oil separator for separating lubricating oil flowing together with a refrigerant from the refrigerant, the container, an inlet pipe connected to the container, and an outlet pipe connected to the container It is equipped with. Three or more flow paths are formed inside the inlet pipe.

  In this oil separator, it is possible to easily separate the lubricating oil from the refrigerant by ensuring a wide surface area with which the lubricating oil can be brought into contact with each flow path of the inlet pipe.

  The oil separator according to the second aspect is the oil separator according to the first aspect, and the inlet pipe has three or more flow paths formed by arranging two or more internal pipes therein. Has been.

  In this oil separator, since each internal pipe has both an inner surface and an outer surface, it is possible to further increase the surface area with which the lubricating oil can be brought into contact.

  The oil separator according to the third aspect is the oil separator according to the second aspect, wherein each end of the internal pipe located inside the container is closer to the inside of the container than the end located below It is arranged so as to extend more toward the. The end part of the upper internal pipe located above among the internal pipes is in contact with the outer peripheral surface of the lower internal pipe located below the upper internal pipe.

  In this oil separator, the lubricating oil that is about to drip from the edge of the upper internal pipe at the outlet of the upper internal pipe is restrained from being accompanied by the refrigerant on the flow rate of the refrigerant flowing through the lower internal pipe. The lubricating oil that is about to drip from the edge portion of the upper internal pipe can be captured by the outer peripheral surface of the lower internal pipe, and the lubricating oil can be more reliably separated from the refrigerant.

  The oil separator which concerns on a 4th viewpoint is an oil separator which concerns on a 2nd viewpoint or a 3rd viewpoint, Comprising: Internal piping has an uneven | corrugated shape in an internal peripheral surface.

  In this oil separator, the surface area on which the lubricating oil can be brought into contact can be further increased by the uneven shape.

  The oil separator according to the fifth aspect is the oil separator according to the fourth aspect, wherein the concave and convex shape of the internal pipe is formed to be spiral toward the traveling direction of the flow path of the internal pipe. .

  In this oil separator, since the lubricating oil can be flowed along the spiral irregular shape formed in the internal pipe, the lubricating oil can be easily held on the inner surface of the internal pipe.

  In the oil separator according to the first aspect, it is possible to easily separate the lubricating oil from the refrigerant.

  In the oil separator according to the second aspect, it is possible to further increase the surface area inside the inlet pipe capable of contacting the lubricating oil.

  In the oil separator according to the third aspect, the lubricating oil can be more reliably separated from the refrigerant.

  In the oil separator according to the fourth aspect, the surface area with which the lubricating oil can be brought into contact can be further increased.

  In the oil separator according to the fifth aspect, the lubricating oil is easily held on the inner surface of the internal pipe.

It is a schematic block diagram of the air conditioning apparatus which concerns on one Embodiment. It is a schematic external appearance block diagram of an oil separator. It is a top view schematic block diagram of an oil separator. It is a schematic block diagram of inlet piping. It is sectional drawing which shows the internal shape of the internal piping provided in the inside of inlet piping. It is a schematic block diagram of the inlet piping of the oil separator which concerns on other embodiment (5-1). It is a top view schematic block diagram of the oil separator which concerns on other embodiment (5-2).

  Hereinafter, an air conditioner 1 employing an oil separator according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a refrigerant circuit diagram showing a refrigerant circuit 10 of the air conditioner 1.

(1) Schematic configuration of air conditioner 1 In the air conditioner 1, an outdoor unit 2 as a heat source side device and an indoor unit 5 as a use side device are connected by a refrigerant pipe, and the use side device is arranged. Perform air conditioning of the space. The air conditioner 1 includes a refrigerant circuit 10, various sensors, and a control unit 70.

  The refrigerant circuit 10 includes an accumulator 28, a compressor 21, an oil separator 30, an oil return pipe 29, a four-way switching valve 24, an outdoor heat exchanger 25, an outdoor expansion valve 27, a first refrigerant communication pipe 6, and an indoor heat exchanger. 51 and the second refrigerant communication pipe 7 and the like are connected.

  The outdoor unit 2 includes an accumulator 28, a compressor 21, an oil separator 30, an oil return pipe 29, a four-way switching valve 24, an outdoor heat exchanger 25, an outdoor expansion valve 27, an outdoor fan 26, and an outdoor control unit 72. Etc. are housed.

  The indoor unit 5 accommodates an indoor heat exchanger 51, an indoor fan 52, an indoor temperature sensor 53, an indoor control unit 74, and the like.

  The outdoor unit 2 and the indoor unit 5 are connected via a first refrigerant communication pipe 6 and a second refrigerant communication pipe 7.

  The four-way switching valve 24 can switch between a cooling operation cycle and a heating operation cycle. In FIG. 1, the connection state when performing the cooling operation is indicated by a solid line, and the connection state when performing the heating operation is indicated by a dotted line. During the cooling operation, the outdoor heat exchanger 25 functions as a refrigerant cooler, and the indoor heat exchanger 51 functions as a refrigerant heater. During the heating operation, the indoor heat exchanger 51 functions as a refrigerant cooler, and the outdoor heat exchanger 25 functions as a refrigerant heater.

  The indoor temperature sensor 53 in the indoor unit 5 is arranged on the indoor air inlet side, and the temperature before the indoor unit 5 takes in from the room and passes through the indoor heat exchanger 51 (that is, the room temperature). To detect.

  The control unit 70 includes an outdoor control unit 72 that is disposed in the outdoor unit 2 and controls the devices of the outdoor unit 2, an indoor control unit 74 that is disposed in the indoor unit 5 and controls the devices of the indoor unit 5, and a user The controller 71 that accepts various setting inputs from each other and performs various display outputs and various sensors are connected by a communication line 70a. The control unit 70 performs various controls for the air conditioner 1.

  In addition, although the combination of the refrigerant | coolant and refrigerator oil used in the air conditioning apparatus 1 is not specifically limited, For example, when a refrigerant | coolant is R410A, you may use ether type synthetic oil (for example, FVC68D) as refrigerator oil, When the refrigerant is R134a, an ether-based synthetic oil (for example, FVC46D) may be used as the refrigerating machine oil, and when the refrigerant is R404A, an ether-based synthetic oil (for example, FVC50K) may be used as the refrigerating machine oil. However, a combination of these may be used together as a mixed refrigerant and a compatible refrigerating machine oil. In each of the above combinations, when the refrigeration oil and the refrigerant are separated in the container 31 of the oil separator 30, the refrigeration oil is positioned below the refrigerant (the specific gravity of the refrigeration oil is greater than that of the refrigerant). Is preferred.

(2) Configuration and Form of Oil Separator FIG. 2 is a schematic external configuration diagram of the oil separator 30. In FIG. 3, the top view schematic structure figure of the oil separator 30 is shown. FIG. 4 shows a schematic configuration diagram of the inlet pipe 22. FIG. 5 is a cross-sectional view showing the internal shape of the internal pipe 41 provided inside the inlet pipe 22. In FIG. 2, the internal shape and thickness of the container main body 31 are indicated by dotted lines, and in FIG. 4, the internal pipe group 40 inside the inlet pipe 22 is indicated by dotted lines.

  The oil separator 30 is for separating the lubricating oil from the fluid discharged from the compressor 21 in which the lubricating oil and the refrigerant are mixed. The oil separator 30 mainly includes the container main body 31 and the compressor 21. It has the inlet piping 22 extended from the container main body 31 toward the discharge side, and the outlet piping 23 extended from the container main body 31 toward the four-way switching valve 24 side.

  The container main body 31 includes an upper cover 31a, an upper cylindrical portion 31b, an intermediate enlarged diameter portion 31c, a lower cylindrical portion 31d, and a lower cover 31e in order from the vertical upper side to the lower side. The container main body 31 is a pressure container, and the material and the thickness are configured so as to satisfy a predetermined standard. The upper cylindrical portion 31b is a cylindrical member whose vertical direction is the axial direction, and is connected to an inlet pipe 22 described later. The lower cylindrical portion 31d is a cylindrical member whose vertical direction is the axial direction, and has a larger inner diameter than the upper cylindrical portion 31b. The vertical length of the lower cylindrical portion 31d is configured to be longer than the vertical length of the upper cylindrical portion 31b. The lower end portion of the upper cylindrical portion 31b and the upper end portion of the lower cylindrical portion 31d are gently connected via an intermediate enlarged diameter portion 31c. The intermediate diameter enlarged portion 31c is configured such that the inner diameter increases as it goes downward in the vertical direction. An upper end portion of the upper cylindrical portion 31b is covered with an upper cover 31a. The upper cover 31a is provided with an opening penetrating in the vertical direction at the upper end portion in order to pass an outlet pipe 23 described later. A lower end portion of the lower cylindrical portion 31d is covered with a lower cover 31e. The lower cover 31e is provided with an opening penetrating in the vertical direction at the lower end portion in order to allow the oil return pipe 29 to pass therethrough.

  The oil return pipe 29 is welded and fixed to the lower cover 31e via a cylindrical fixing member 29p provided inside the opening of the lower cover 31e and outside the oil return pipe 29 in the radial direction. An oil return pipe 29 extending from the lower cover 31 e of the oil separator 30 is provided with an accumulator 28 and a compressor so as to return the lubricating oil separated in the container body 31 and collected downward to the downstream side of the compressor 21. 21.

  One end of the outlet pipe 23 is connected to the pipe on the four-way switching valve 24 side, and the other end is connected to the upper cover 31a of the container body 31 in the vertical direction. The outlet pipe 23 and the upper cover 31a are located inside an opening provided so as to penetrate the upper cover 31a in the vertical direction and through a cylindrical fixing member 23p provided on the radially outer side of the outlet pipe 23. It is fixed by welding. Of the outlet pipe 23, an inner outlet pipe 23a that is an inner portion of the container body 31 extends vertically downward from the upper cover 31a. The lower end of the internal outlet pipe 23a is located at a height position in the middle of the intermediate enlarged diameter portion 31c, and opens downward. The inner diameter of the outlet pipe 23 is not particularly limited, but may be, for example, 10% or more and 50% or less of the inner diameter of the upper cylindrical portion 31b of the container body 31.

  The inlet pipe 22 has one end connected to the discharge side pipe of the compressor 21 and the other end connected to the upper cylindrical portion 31b. The inlet pipe 22 and the upper cylindrical portion 31b are configured such that the inlet pipe 22 extending in the horizontal direction is connected to the upper portion of the upper cylindrical portion 31b. The connection position between the inlet pipe 22 and the upper cylindrical portion 31 b is located above the lower end position of the inner outlet pipe 23 a of the outlet pipe 23. Here, as shown in the top sectional view of FIG. 3, the inlet pipe 22 and the upper cylindrical portion 31 b are provided inside the opening provided on the side surface of the upper cylindrical portion 31 b and outside the inlet pipe 22 in the radial direction. It is fixed by welding via the cylindrical fixing member 22p. Here, as shown in FIG. 3, the inner inlet pipe 22a, which is the inner part of the container main body 31, in the inlet pipe 22 is connected to a position shifted from the axis of the upper cylindrical portion 31b, and the inner inlet pipe 22a. Is positioned so as to be gently connected in the tangential direction of the inner periphery of the upper cylindrical portion 31b. That is, the radially outer portion of the upper cylindrical portion 31b in the inner periphery near the tip of the internal inlet pipe 22a is connected so as to be gently along the inner peripheral surface of the upper cylindrical portion 31b. The internal inlet pipe 22a is a cylindrical pipe. Similarly, the external inlet pipe 22b connected to the discharge side of the compressor 21 in the inlet pipe 22 and located outside the container main body 31 is also a cylindrical pipe. Further, an end of the external inlet pipe 22b opposite to the curved part 22c side is provided with a pipe expanding part 22q for connecting to a pipe extending from the discharge side of the compressor 21. The internal inlet pipe 22a and the external inlet pipe 22b are provided so that the height positions in the vertical direction are approximately the same, and are connected via a curved portion 22c that is curved at about 90 degrees on a horizontal plane. For this reason, the refrigerant discharged from the discharge side of the compressor 21 is greatly bent in the flow direction immediately before flowing into the container body 31.

  As shown in FIGS. 3 and 4, an internal pipe group 40 including a first internal pipe 41, a second internal pipe 42, and the like is provided inside the inlet pipe 22. The number of internal pipes 41 and 42 included in the internal pipe group 40 is not particularly limited as long as three or more independent flow paths are provided inside the inlet pipe 22. For example, one or more The number may be 20 or less, and the lower limit may be 2 or more. In this embodiment, an example in which 8 is provided will be described. In addition, it is preferable that each internal piping 41 and 42 is a pipe shape, and a shape is not specifically limited. For example, a cylindrical shape may be sufficient and a cylindrical shape with a cross section may be sufficient. Moreover, since the refrigerant | coolant which passes the discharge side of the compressor 21 flows into the inlet piping 22, the material and thickness for ensuring predetermined intensity | strength are calculated | required, However, About each internal piping 41 and 42, it is the internal piping 41. The pressure acting on the inner side and the outer side of 42 is equal, so that the strength as high as the inlet pipe 22 is not required. For this reason, the thickness of each internal pipe 41 and 42 may be thinner than the thickness of the inlet pipe 22. In the present embodiment, the end of each internal pipe 41, 42 on the container body 31 side is provided so as to be aligned with the end of the inlet pipe 22 on the container body 31 side. As described above, by providing the plurality of internal pipes 41 and 42 inside the inlet pipe 22, it is possible to secure a sufficiently large surface area where the refrigerant and the lubricating oil that pass through the portion of the inlet pipe 22 come into contact. ing. That is, the refrigerant and the lubricating oil can be brought into contact with the inner surface of the inlet pipe 22 and the inner and outer surfaces of the inner pipes 41 and 42.

  Further, as shown in FIG. 5, the internal pipe 41 (and other internal pipes) is provided with a convex portion 41a and a concave portion 41b on the inner surface. The convex portions 41a and the concave portions 41b are formed so as to be spiral in the traveling direction of the flow paths in the internal pipes 41 and 42, respectively. Thereby, since lubricating oil can be poured along the uneven | corrugated shape of each internal piping 41 and 42, it becomes easy to hold | maintain lubricating oil on the inner surface of each internal piping 41 and 42. FIG.

(3) Separation Action of Lubricant from Refrigerant in Oil Separator 30 The high-pressure and high-temperature gas refrigerant discharged from the discharge side of the compressor 21 is accompanied by a large amount of lubricating oil.

  The fluid in which the refrigerant and the lubricating oil are mixed flows from the compressor 21 to the front of the inlet pipe 22. When this fluid passes through the inlet pipe 22, it passes through a portion having a sufficiently large contact area including the inner surface of the inlet pipe 22 and the inner and outer surfaces of the inner pipes 41 and 42 of the inner pipe group 40. Gas refrigerant and lubricating oil having different specific gravity and viscosity are separated from each other. The separated lubricating oil flows along the surfaces of the inlet pipe 22 and the internal pipe groups 41 and 42.

  In particular, the lubricating oil that flows along the convex portions 41a and the concave portions 41b of the internal pipes 41 and 42 is not mixed with the refrigerant again so as to stably follow the inner circumference of the internal pipes 41 and 42. It can flow to the outlet side ends of the pipes 41 and 42.

  In this way, the lubricating oil that has flowed to the outlet of the inner inlet pipe 22a in the inlet pipe 22 is partially sent along the inner peripheral surface of the upper cylindrical portion 31b of the container body 31 along the flow velocity. And gathered under the container body 31 by its own weight along the inner peripheral surface of the container body 31. Further, the other part of the lubricating oil falls downward from the ends of the internal pipes 41 and 42 by its own weight and is collected below the container body 31. Further, since the opening at the lower end of the outlet pipe 23 is located in the vicinity of the center so as not to contact the wall surface of the container body 31, the lubricating oil descending in the container body 31 flows into the outlet pipe 23. It is hard to be accompanied by the gas refrigerant that heads. For this reason, it can suppress that lubricating oil flows out from the container main body 31 to the four-way selector valve 24 side so that it may accompany a gas refrigerant via the exit piping 23.

  Then, as described above, the lubricating oil collected below the container body 31 is returned again to the compressor 21 via the oil return pipe 29.

(4) Features of the present embodiment In the oil separator 30 of the present embodiment, the internal piping group 40 is provided inside the inlet piping 22, so that the fluid in which the gas refrigerant discharged from the compressor 21 and the lubricating oil are mixed is used. In the stage before reaching the container body 31, it is easy to be separated. That is, while flowing the lubricating oil along the inner peripheral surface of the inlet pipe 22 and the inner peripheral surface and outer peripheral surface of each of the internal pipes 41 and 42, the gas refrigerant is flowed so as not to follow these surfaces. It is easy to separate the refrigerant and the lubricating oil.

  Thereby, the lubricating oil that has passed through the inlet pipe 22 and has reached the inside of the container body 31 can be easily made into an oil droplet state instead of a mist state, and the inside of the container body 31 can be easily lowered downward by its own weight. It has become.

  Further, the tip of the internal inlet pipe 22a is provided so as to be gently connected in the tangential direction of the inner circumference of the upper cylindrical portion 31b, so that the flow flows along the surface of the internal pipe group 40 and the surface of the inlet pipe 22. It is also possible to flow the lubricating oil along the inner peripheral surface of the upper cylindrical portion 31b of the container main body 31 while suppressing mixing with the refrigerant again. As a result, the lubricating oil can be collected downward while turning the inner peripheral surface of the container body 31.

  As described above, the lubricating oil collected below the container body 31 is again returned via the oil return pipe 29 while suppressing the lubricant oil from flowing out from the container body 31 through the outlet pipe 23. It is possible to return to the compressor 21.

(5) Other embodiments (5-1)
In the said embodiment, the case where the edge part by the side of the container main body 31 of each internal piping 41 and 42 was provided so that it might align with the edge part by the side of the container main body 31 of the inlet piping 22 was mentioned as an example, and was demonstrated.

  On the other hand, for example, as shown in the schematic configuration diagram of the inlet pipe 222 in FIG. 6, instead of the internal pipe group 40 of the above embodiment, a first internal pipe 241, a second internal pipe 242, and a third internal pipe. An internal piping group 240 in which the positions of the end portions on the container body 31 side such as 243 are different from each other may be provided.

  The first internal pipe 241, the second internal pipe 242, and the third internal pipe 243 of the internal pipe group 240 are arranged in this order from above in the state where the oil separator 30 is installed.

  And the end parts of the internal pipes 241, 242, 243, etc. of the internal pipe group 240 are directed toward the inside of the container body 31 as the end part located below in the state where the oil separator 30 is installed. It is arranged to extend more greatly. Specifically, the inner end of the container body 31 of the third internal pipe 243 extends more toward the inside of the container body 31 than the inner end of the container body 31 of the second internal pipe 242. It is provided as follows. The inner end of the container body 31 of the second internal pipe 242 is provided so as to extend larger toward the inner side of the container body 31 than the inner end of the container body 31 of the first internal pipe 241. It has been.

  Here, the inner end of the container main body 31 of the first internal pipe 241 positioned above is in contact with the outer peripheral surface of the second internal pipe 242 positioned below the first internal pipe 241. . Further, the inner end of the container body 31 of the second internal pipe 242 is in contact with the outer peripheral surface of the third internal pipe 243 located below the second internal pipe 242.

  As a result, the lubricating oil that is about to drip from the end of the first internal pipe 241 flows through the second internal pipe 242 positioned below at the outlet of the first internal pipe 241 positioned above. Along with the flow rate of the coming refrigerant, accompanying with the refrigerant is suppressed. Similarly, at the outlet of the second internal pipe 242, the lubricating oil about to drip from the end of the second internal pipe 242 rides on the flow rate of the refrigerant flowing through the third internal pipe 243 located below. Therefore, accompanying with the refrigerant is suppressed.

  Therefore, the lubricating oil that is about to drip from the end of the first internal pipe 241 is caught by the outer peripheral surface of the second internal pipe 242 below, and is directed downward so as to cover the surface of the second internal pipe 242. It is possible to descend more reliably. Similarly, the lubricating oil which is about to drip from the end of the second internal pipe 242 is caught by the outer peripheral surface of the lower third internal pipe 243 and is lowered so as to cover the surface of the third internal pipe 243. It is possible to descend more reliably toward the.

  As described above, the lubricating oil separated from the refrigerant and flowing along the surfaces of the internal pipes 241, 242, and 243 of the internal pipe group 240 flows to the outside of the oil separator 30 along with the flow of the refrigerant. It is possible to collect it more reliably while suppressing the movement.

(5-2)
In the said embodiment, when the front-end | tip part of the internal inlet piping 22a located inside the container main body 31 among the inlet piping 22 is provided so that it may be gently connected in the tangential direction of the inner periphery of the upper cylindrical part 31b. Was described as an example.

  On the other hand, for example, as shown in FIG. 7, the container body 31 is not connected gently in the tangential direction of the inner periphery of the upper cylindrical part 31b, but is connected to the upper part through the space inside the upper cylindrical part 31b. An inlet pipe 322 that is bent so that an end portion of the inner inlet pipe 322a extending to the vicinity of the inner peripheral surface of the cylindrical portion 31b extends along the inner peripheral surface of the upper cylindrical portion 31b may be employed.

  Even in this configuration, the lubricating oil flowing along the surface of the internal piping group 40 and the surface of the inlet piping 322 is prevented from being mixed with the refrigerant again, while the upper cylindrical portion 31b of the container main body 31 is not mixed. Flowing along the inner peripheral surface, it is possible to collect the container body 31 while rotating the inner peripheral surface of the container body 31 downward.

1 Air Conditioner 22 Inlet Pipe 23 Outlet Pipe 28 Accumulator 29 Oil Return Pipe 30 Oil Separator 31 Container Body (Container)
31a Upper cover 31b Upper cylindrical part 31c Middle diameter-expanded part 31d Lower cylindrical part 31e Lower cover 40 Internal piping group 41 1st internal piping 41a Convex part (uneven shape)
41b Concave part (concave and convex shape)
42 2nd internal piping 222 Inlet piping 240 Internal piping group 241 1st internal piping (upper internal piping)
242 Second internal piping (upper internal piping, lower internal piping)
243 Third internal piping (lower internal piping)
322 Inlet piping

JP 05-31438 A

Claims (5)

An oil separator (30) for separating the lubricating oil flowing with the refrigerant from the refrigerant,
A container (31);
An inlet pipe (22, 222, 322) connected to the vessel;
An outlet pipe (23) connected to the vessel;
With
Three or more flow paths are formed inside the inlet pipe (22, 222, 322).
Oil separator (30). The inlet pipe (22, 222, 322) has two or more internal pipes (41, 42, 241, 242, 243) arranged therein, so that three or more flow paths are formed. ,
The oil separator according to claim 1. Each end of the internal pipe located inside the container is arranged so as to extend more toward the inside of the container as the end located below,
The end of the upper internal pipe (241, 242) located above the internal pipe is in contact with the outer peripheral surface of the lower internal pipe (242, 243) located below the upper internal pipe. ,
The oil separator according to claim 2. The internal pipe (41) has an uneven shape (41a, 41b) on the inner peripheral surface,
The oil separator according to claim 2 or 3. The concavo-convex shape (41a, 41b) of the internal pipe (41) is formed so as to be spiral toward the traveling direction of the flow path of the internal pipe.
The oil separator according to claim 4.

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