JP4063179B2 - Oil separator - Google Patents

Description

  The present invention relates to an oil separator that separates oil contained in a gas-phase refrigerant discharged from a compressor.

  A first conventional oil separator will be described with reference to FIG. The separation member 111 provided at a predetermined position on the upper portion of the container body 110, and a columnar partition plate 112 having a predetermined length with an upper opening and a lower opening provided at a predetermined position downward from the separation member 111. The central portion of the container body is separated into the inner chamber 113 and the outer chamber 114, and the refrigerant inlet pipe 116 having an opening in the upper portion of the inner chamber 113 in the tangential direction of the partition plate 112 and the upper end of the container body 110 is opened. And a refrigerant outlet pipe 117 connected thereto is provided. As a result, even if the cross-sectional area of the separating material is increased in order to improve the oil separation performance and the inner diameter of the container body is increased, the inner diameter of the inner chamber for performing the centrifugal separation does not increase, but is inversely proportional to the turning radius of the refrigerant. It is possible to prevent a decrease in oil separation ability due to a decrease in centrifugal force (see, for example, Patent Document 1).

A second conventional oil separator will be described with reference to FIG. A partition that divides the inside of the casing 211 into an upper space portion A, a middle filter portion B, and a lower oil sump portion C is provided, and a cylindrical space 212, a first filter 214, a middle space 216, and a second filter 218 are provided in the middle filter portion. The cylindrical holes 227 are arranged concentrically at the lower part of the first filter 214, and the lower end of the cylindrical hole 227 and the lower end of the middle space 216 are communicated with the lower oil sump 229, and are connected to the cylindrical space 212. By guiding the gas containing oil particles from the compressor unit used in the cryogenic refrigerator and exhausting the gas through the first filter 214, the middle space 216, the second filter 218, and the upper space 237, the first filter 214 is discharged. The oil particles are repaired by the second filter 218 and guided to the lower oil sump 229 through the cylindrical hole 217 and the middle space 216. Furthermore, the oil suitability reaches the inner wall of the casing 211 and flows toward the oil sump 229 below, and a fine metal net layer 238 is provided to facilitate this oil suitability. (For example, see Patent Document 2)
Japanese Patent Laid-Open No. 10-9722 JP-A-7-332779

  However, in the former configuration, since the cylindrical partition plate 112 has a small inner diameter, the flow velocity of the refrigerant swirling and flowing is remarkably high, and the oil droplets once adhered to the inner wall of the partition plate 112 are once again scattered, It had a problem that it was ejected in a mist form from the opening and could not be completely separated by the separating material 111.

  In the latter configuration, an inlet pipe 223 is provided downward from the upper part of the casing, and a mixed fluid of gas and oil is ejected into the casing 211 through the inlet pipe 223. Although the oil separated by the filters 214 and 218 is guided to the vicinity of the lower partition plate 221, the oil staying in the vicinity of the partition plate 221 is scattered because the inlet pipe 223 faces downward. In addition, since the filter layer is thick, the flow resistance of the refrigerant is remarkably increased, and the loss of the refrigeration cycle is increased.

  This invention solves such a conventional subject, and it aims at providing an oil separator with high oil separation performance.

  In order to solve the above-mentioned problems, the present invention is such that an inlet pipe for introducing a mixed fluid is inserted from a side wall of a container body, and a net-like thin film is arranged on the inner wall of the container body near the tip of the inlet pipe. The mixed fluid of the refrigerant and the oil is ejected so as to collide with the inner wall of the main body, but the oil is adsorbed in the gap between the net-like thin film and the inner wall of the container body, and is discharged from the oil discharge pipe at the lower part of the container body by its own weight. The net-like thin film also has a function of preventing the adsorbed oil from scattering.

  In the present invention, a plurality of metal plates are provided in the horizontal direction on the inner wall of the container body near the tip of the inlet pipe. When the mixed fluid of the refrigerant and oil is jetted into the cylindrical container body, it is suppressed that the fluid flows in the vertical direction with less resistance than the circumferential direction. As a result, the mixed fluid becomes a swirling flow, and the oil tends to adhere to the inner wall of the container body, so that the separation performance can be further improved.

The present invention is a mesh-like thin film, is that arranging the cylindrical shape along the container body sidewall. Thereby, the area to adsorb | suck can be ensured widely and isolation | separation performance can be improved more. Moreover, the net-like thin film can be fixed easily in a cylindrical shape without moving in the circumferential direction.

The present invention is a mesh-like thin film obtained by bending the unevenness, in which disposed on along the container body sidewall. Accordingly, volume of the gap between the tone-like thin film and the container body side wall can be ensured larger, it is possible to increase the falling speed due to its own weight by increasing the amount of adsorbed oil.

The present invention is a mesh-like thin film folded irregularities, the irregularities by making along the container body side wall so as to spirally with respect to the turning direction of the mixed fluid, providing a downward spiral irregularities In this way, it is possible to introduce a flow speed that further utilizes the swirl speed to the flow speed of the oil falling by its own weight, and to improve the oil flow speed.

  In addition, the present invention can quickly remove the oil separated in the upper separation part by inclining the porous metal plate provided on the lower surface of the separation part downward from the central part of the container body toward the inner wall of the container body. It can guide to the side wall of the container body, and the separation performance can be enhanced.

  Moreover, this invention forms so that the porous metal plate with which the lower surface of the isolation | separation part was equipped, and the net-like thin film distribute | arranged along the inner wall of a container main body mutually overlap. Thereby, scattering on the wall surface can be prevented by the swirling flow of the mixed fluid, and the separation performance can be further enhanced.

  In the present invention, a porous metal plate provided on the lower surface of the separation part is arranged in a cylindrical shape along the inner wall of the container body, and a net-like thin film is provided between the metal plate and the inner wall of the container body. It is a thing. Thereby, while ensuring the clearance gap between a mesh-like thin film and a main body inner side wall, fixation of a mesh-like thin film becomes easier, and workability can be improved.

  As is clear from the above embodiment, the refrigerant and oil ejected from the refrigerant inlet pipe into the container body collide with a net-like thin film provided on the inner wall of the container main body, and the refrigerant is discharged from the upper refrigerant outlet pipe. The oil is held by this net-like thin film with surface tension, flows down to the lower part of the container body by gravity, and is discharged from the oil discharge pipe.

Also, by providing a plurality of metal plates horizontally on the inner wall of the container main body near the tip of the refrigerant inlet pipe, the refrigerant and oil ejected from the refrigerant inlet pipe collide with the inner wall of the container main body and be separated vertically. Although it is going to flow, it will flow compulsorily along the inner periphery of a container main body with the several metal plate provided horizontally. As a result, minute oil droplets are likely to adhere to the inner surface of the container body due to centrifugal force, and oil separation performance is improved.

  In addition, by forming the net-like thin film into a cylindrical shape, the oil flowing down along the inner wall in the container body can flow smoothly without being disturbed by the refrigerant rising at high speed near the center in the container body. it can.

  In addition, the mixed fluid is bent toward the concave and convex portions along the inner wall of the container body and ejected toward the reticulated thin film arranged in a cylindrical shape, so that a part of the mixed oil is formed between the reticulated thin film and the inner wall of the container main body. When the oil adsorbed in the gap flows down along the wall surface, it flows down without being scattered by the mixed fluid flowing in the vicinity of the center of the container body due to the net-like thin film bent into a concave and convex shape and arranged in a cylindrical shape. be able to. In addition, by forming a cylindrical shape by bending the projections and depressions, a large number of channels through which oil flows can be secured, and the separation performance can be further improved.

  In addition, since the net-like thin film is spirally bent into irregularities, the oil adsorbed by the swirling flow of the mixed fluid creates a downward velocity component by having a downward inclination angle with respect to the circumferential direction. Thus, the flow velocity can be accelerated and the separation performance can be further improved.

  In addition, since the porous metal plate provided on the lower surface of the separation part has a dome shape that is inclined downward from the central part of the container body toward the inner wall of the container body, the oil attached to the fibers constituting the separation part is It becomes easy to flow to the inner wall surface of the main body container by its own weight, and to flow down to the lower part along the wall surface. Thereby, the separation performance is further improved.

  In addition, since the net-like thin film and the dome-shaped porous metal plate provided on the lower surface of the separation part overlap, the oil adhering to the fibers in the separation part is continuously guided to the lower part of the container. Therefore, the possibility of being scattered by the mixed fluid flowing through the central portion can be significantly reduced, and the separation performance can be improved.

  In addition, the porous metal plate formed integrally with the lower surface of the separation part and the cylindrical metal plate makes it easy to fix the net-like thin film, and can secure the oil flow channel flowing down the wall surface of the container main body. The possibility of being scattered by the flowing mixed fluid can be significantly reduced, and the separation performance can be improved and the workability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a basic configuration of the first embodiment, and FIG. 2 is a cross-sectional view taken along plane AA of FIG. In FIG. 1 and FIG. 2, the mixed fluid of refrigerant and oil is guided into the container body by the inlet pipe 2 inserted from the side surface of the container body 1 and enters the reticulated thin film 8a disposed on the inner wall of the container body. It ejects from the tube 2 tip. Thereafter, when the mixed fluid passes through the separation unit 5, the oil adheres to the fibers constituting the separation unit, the refrigerant passes through the separation unit, and is connected to an upper opening provided in the upper part of the container body 1. It flows out from the tube 3.

According to the above configuration, the mixed fluid is ejected toward the net-like thin film 8a disposed on the inner wall of the container body, whereby a part of the mixed oil is adsorbed in the gap between the net-like thin film 8a and the inner wall of the container body. The oil flows down to the lower part of the container body due to its own weight and is discharged by the oil discharge pipe 4. When the oil that cannot be adsorbed passes through the separation part 5, it adheres to the fibers constituting the separation part 5, flows down along the inner wall of the container body, collects at the lower part of the container body, and flows out from the oil discharge pipe 4. . As described above, the separation performance can be improved by adsorbing the oil in the gap between the net-like thin film 8a and the inner wall of the container main body, in addition to separating the oil by the separation unit 5 as in the prior art.

(Embodiment 2)
FIG. 3 is a basic configuration of the second embodiment, and FIG. 4 is a cross-sectional view taken along plane AA of FIG. 3 and 4, the mixed fluid of the refrigerant and oil is guided into the container body by the inlet pipe 2 inserted from the side surface of the container body 1, and enters the reticulated thin film 8 a disposed on the inner wall of the container body. It ejects from the tube 2 tip. Near the tip of the inlet pipe 2, a plurality of metal plates 9 are provided horizontally on the inner wall of the container body 1 above and below the net-like thin film 8 a.

  According to the above configuration, when the mixed fluid is ejected toward the net-like thin film 8a disposed on the inner wall of the container body, the mixed fluid tends to flow separately in the vertical direction of the inner wall of the container body. This is because the angle change of 90 degrees or more is required to change the flow direction to the horizontal direction after a collision with the inner wall surface of the container body, whereas the angle change of 90 degrees is sufficient in the vertical direction. Because there are few. The flow in the vertical direction is changed in flow direction to a horizontal swirl flow by a plurality of horizontal metal plates 9 and flows along the inner wall surface. Thereby, when passing through the separation unit 5, the flow velocity distribution can be made uniform, and the separation performance in the separation unit 5 can be enhanced.

(Embodiment 3)
FIG. 5 shows a cross-sectional view of the third embodiment. In FIG. 5, the mixed fluid of refrigerant and oil is guided into the container body by the inlet pipe 2 inserted from the side surface of the container body 1, and is applied to the net-like thin film 8b arranged in a cylindrical shape along the inner wall of the container body. It spouts out from the inlet pipe 2 tip. Thereafter, as described in the first embodiment, when the mixed fluid passes through the separation unit 5, the oil adheres to the fibers constituting the separation unit, the refrigerant passes through the separation unit, and the upper part of the container body 1. It flows out from the refrigerant | coolant exit pipe | tube 3 connected to the provided upper opening part.

  According to the above configuration, the mixed fluid is ejected toward the net-like thin film 8b arranged in a cylindrical shape so as to follow the inner wall of the container body, so that a part of the oil mixed therein is the net-like thin film 8b and the inner wall of the container body. And flows down to the lower part of the container body due to its own weight, and is discharged by the oil discharge pipe 4. When oil flows down along the wall surface, the tubular thin film can flow down without being scattered by the mixed fluid flowing in the vicinity of the center of the container body, and the separation performance can be improved.

(Embodiment 4)
FIG. 6 shows a cross-sectional view of the fourth embodiment. In FIG. 6, the mixed fluid of refrigerant and oil is guided into the container body by the inlet pipe 2 inserted from the side surface of the container body 1, and is bent in a concavo-convex shape along the inner wall of the container body so as to be arranged in a cylindrical shape. From the tip of the inlet tube 2 toward the thin film 8c. Thereafter, as described in the first embodiment, when the mixed fluid passes through the separation unit 5, the oil adheres to the fibers constituting the separation unit, the refrigerant passes through the separation unit, and the upper part of the container body 1. It flows out from the refrigerant | coolant exit pipe | tube 3 connected to the provided upper opening part.

  According to the above configuration, the mixed fluid is bent toward the concavo-convex shape along the inner wall of the container body and ejected toward the net-like thin film 8c arranged in a cylindrical shape, whereby a part of the mixed oil is reticulated. And the inner wall of the container main body, flow down to the lower part of the container main body due to its own weight, and are discharged by the oil discharge pipe 4. When the oil flows down along the wall surface, it can flow down without being scattered by the mixed fluid flowing in the vicinity of the center of the container body by the net-like thin film that is bent into irregularities and arranged in a cylindrical shape. In addition, by forming a cylindrical shape by bending the projections and depressions, a large number of channels through which oil flows can be secured, and the separation performance can be further improved.

(Embodiment 5)
FIG. 7 is a basic configuration of the fifth embodiment, and FIG. 8 is a cross-sectional view taken along plane AA of FIG. 7 and 8, the mixed fluid of the refrigerant and the oil is inserted from the side surface of the container body 1 and is ejected into the container body from the inlet pipe 2d whose tip is bent in the circumferential direction of the container body side wall. The mixed fluid ejected toward the net-like thin film 8d arranged in a cylindrical shape by being spirally bent along the inner wall of the container main body is adsorbed in the gap between the net-like thin film 8d and the inner wall.

  According to the above-described configuration, the adsorbed oil is formed by the swirling flow of the mixed fluid because the net-like thin film 8d is helically bent into an uneven shape and has a downward inclination angle with respect to the circumferential direction. 7, the velocity component indicated by the arrow 10 shown in FIG. 7 can be created, whereby the flow velocity can be accelerated and the separation performance can be further enhanced.

(Embodiment 6)
FIG. 9 shows a basic configuration of the sixth embodiment. In FIG. 9, the mixed fluid of refrigerant and oil is ejected into the container body from the inlet pipe 2 d inserted from the side surface of the container body 1. In the mixed fluid ejected toward the net-like thin film 8a arranged along the inner wall of the container main body, only the oil component is adsorbed in the gap between the net-like thin film 8a and the inner wall. Thereafter, when the mixed fluid passes through the separation part 5b, the oil adheres to the fibers constituting the separation part, the refrigerant passes through the separation part, and is connected to an upper opening provided in the upper part of the container body 1. It flows out from the tube 3. When passing through the separation part, the oil adhering to the fibers constituting the separation part is applied to the porous metal plate 6b provided on the lower surface of the separation part inclined downward from the central part of the container body toward the inner wall of the container body. Along the wall.

  According to the above configuration, since the porous metal plate 6b provided on the lower surface of the separation part has a dome shape that is inclined downward from the central part of the container body toward the inner wall of the container body, the fibers constituting the separation part The oil adhering to the oil easily flows on the inner wall surface of the main body container by its own weight, flows down along the wall surface, and is easily discharged from the oil discharge pipe 4. Thereby, the separation performance is further improved.

(Embodiment 7)
FIG. 10 shows a basic configuration of the seventh embodiment. In FIG. 10, the mixed fluid of refrigerant and oil is jetted into the container body from the inlet pipe 2 inserted from the side surface of the container body 1. Only the oil component of the mixed fluid ejected toward the net-like thin film 8b arranged in a cylindrical shape along the inner wall of the container main body is adsorbed in the gap between the net-like thin film 8b and the inner wall. Thereafter, when the mixed fluid passes through the separation part 5b, the oil adheres to the fibers constituting the separation part, the refrigerant passes through the separation part, and the refrigerant outlet is connected to the upper opening provided in the upper part of the container body 1. It flows out from the tube 3. When passing through the separation part, the oil adhering to the fibers constituting the separation part is a porous dome-shaped metal provided on the lower surface of the separation part inclined downward from the central part of the container body toward the inner wall of the container body It is led to the wall surface along the plate 6b. Here, the net-like thin film 6b and the dome-shaped metal plate 6b are formed to overlap each other.

  According to the above configuration, the net-like thin film 8b and the dome-shaped porous metal plate 6b provided on the lower surface of the separation part overlap each other, so that the oil adhering to the fibers in the separation part is continuously in the lower part of the container. By being guided, the possibility of being scattered by the mixed fluid flowing through the central portion can be remarkably reduced, and the separation performance can be improved.

(Embodiment 8)
FIG. 11 shows a basic configuration of the eighth embodiment. In FIG. 11, the mixed fluid of refrigerant and oil is jetted into the container body from the inlet pipe 2 inserted from the side surface of the container body 1. A metal plate 6c formed integrally with a porous metal plate provided on the lower surface of the separating portion 5b, a metal plate arranged in a cylindrical shape so as to follow the inner wall of the container body, and a net shape disposed between the inner wall of the container body The thin film 8b.

  According to the above configuration, the mesh-like thin film 8b can be easily fixed by the porous metal plate 6c formed integrally with the lower surface of the separation part, and the oil flow channel flowing down the wall surface of the container body can be secured, and flows through the central part. The possibility of being scattered by the mixed fluid can be significantly reduced, and the separation performance can be improved and the workability can be improved.

Basic configuration diagram of Embodiment 1 of the present invention Sectional drawing which looked at the AA cross section of FIG. 1 from upper direction Basic configuration diagram of Embodiment 2 of the present invention Sectional drawing which looked at the AA section of FIG. 3 from upper direction Sectional view seen from above of Embodiment 3 of the present invention Sectional drawing seen from the top of Embodiment 4 of this invention Basic configuration diagram of Embodiment 5 of the present invention Sectional drawing which looked at AA cross section of FIG. 7 from upper direction Basic configuration diagram of Embodiment 6 of the present invention Basic configuration diagram of Embodiment 7 of the present invention Basic configuration diagram of Embodiment 8 of the present invention Basic configuration diagram of the first conventional example Basic configuration diagram of the second conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container body 2, 2d Inlet pipe 3 Refrigerant outlet pipe 4, Oil discharge pipe 5, 5b Separation part 6, 6b, 6c Porous metal plate on the lower surface of the separation part 7 Porous metal plate 8a, 8b, 8c, 8d on the upper surface of the separation part Thin film 9 Horizontal metal plate

Claims (7)

An inlet pipe inserted into the side wall of the cylindrical container body, a refrigerant outlet pipe connected to an upper opening provided in the upper part of the container body, and a lower opening provided in the lower part of the container body An oil discharge pipe, a separator is provided on the entire upper surface of the container body, a separator made of a porous metal plate provided on the upper and lower surfaces of the separator, and a container-like inner wall near the refrigerant inlet pipe tip An oil separator characterized by comprising a plurality of metal plates in the horizontal direction on the inner wall of the container body in the vicinity of the inlet pipe tip . The oil separator according to claim 1, wherein the net-like thin film is arranged in a cylindrical shape along the inner wall of the container body. The oil separator according to any one of claims 1 to 2, wherein a net-like thin film bent into irregularities is disposed along the inner wall of the container body. A container body inner wall inserted into a side wall of a cylindrical container body and having a distal end bent in the circumferential direction of the container body side wall and a net-like thin film bent into a concavo-convex shape so that the concavo-convex shape is spiral. The oil separator according to any one of claims 1 to 2, wherein the oil separator is arranged along the line. The oil separation according to any one of claims 1 to 4, wherein the porous metal plate provided on the lower surface of the separation part is inclined downward from the central part of the container body toward the inner wall of the container body. vessel. The porous metal plate provided on the lower surface of the separation part and the net-like thin film arranged along the inner wall of the container body are formed so as to overlap each other. An oil separator as described in 1. A porous metal plate provided on the lower surface of the separation portion and a metal plate arranged in a cylindrical shape along the inner wall of the container body are formed integrally, and a net-like thin film is formed between the metal plate and the inner wall of the container body. The oil separator according to any one of claims 1 to 6, wherein the oil separator is provided.

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