JP2019072688A - Gas-liquid separator and hydraulic compressor - Google Patents

Abstract

To improve an efficiency of primary separation in a gas-liquid separator.SOLUTION: A gas-liquid separator 1 comprises a rectification part 27 which is located in a container 21. The rectification part 27 projects from a cylindrical part 25 toward a side wall 21b of the container 21, and extends in a direction in which a gas is introduced from an introduction port 21c of the gas along the side wall 21b in a plan view. The rectification part 27 defines a guide channel 29, in which the gas flows, together with a partition plate part 22 which closes the side wall 21b of the container 21 and an upper end opening of the container 21. The guide channel 29 has an outlet 29c which opens into the container 21 on a side opposite to the introduction port 21c.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas-liquid separator and an oil-cooled compressor.

  Patent Document 1 discloses an oil separator which is an example of a gas-liquid separator. The oil separator comprises a container for primary separation of the oil contained in the discharge air of the oil-cooled compressor by centrifugal force, and an oil separation element for capturing and secondary separation of the oil contained in the discharge air after the primary separation. Equipped with

JP, 2011-41920, A

  By improving the efficiency of primary oil separation in the container, the amount of oil that needs to be captured by the oil separation element can be reduced, the service life of the oil separation element can be extended, and problems such as clogging of the oil separation element occur Can also be reduced.

  However, in the oil separator of Patent Document 1, the efficiency improvement of the primary separation of the oil in the container is not particularly considered.

  The present invention is a gas-liquid separator including a container for primary separation of liquid contained in gas by centrifugal force and a liquid separation element for secondary separation and capture of liquid from gas after primary separation, the efficiency of primary separation The task is to improve the Another object of the present invention is to provide an oil-cooled compressor provided with such a gas-liquid separator (oil separator).

  A first aspect of the present invention is disposed in a first space defined by a container having a bottom and having a liquid containing gas introduced from an inlet, and the container and the partition portion. A tubular portion extending from the partition plate portion downward and spaced apart from the side wall of the container, and projecting from the tubular portion toward the side wall from the tubular portion and along the side wall in a plan view Extending along the side wall, the cylinder portion, and the partition plate portion to define a guide channel through which the gas introduced from the inlet flows, the guide channel being on the side where the inlet is located A flow straightening unit having an outlet opening to the first space on the opposite side, a closing unit closing the side on which the inlet of the guide flow channel is located, and provided above the partition plate. A casing which defines a second space together with the partition plate portion, and is disposed in the second space A gas-liquid separation system comprising: a separated liquid separation element; a connection flow path for fluidly connecting the inside of the cylinder and the second space; and an outlet for letting the gas having passed through the liquid separation element flow out. Provide the

  The gas introduced from the inlet into the first space flows downward as a swirl flow along the side wall of the container. The liquid contained in the gas is separated by centrifugal force, adheres to the side wall, falls along the side wall, and is recovered below the vessel (primary separation). After reaching the lower side of the container, the gas ascends in the cylinder and flows into the second space via the connection flow channel. The gas flowing into the second space passes from the outside to the inside of the liquid separation element, and the liquid contained in the gas is separated from the gas by being captured by the liquid separation element (secondary separation). The gas after secondary separation is derived from the outlet.

  The gas in the initial stage of introduction from the inlet to the first space is sufficiently smaller than the cross-sectional area of the guide channel defined by the side wall, the cylinder, the partition and the flow straightener, that is, the cross section of the container Since it passes through the flow path having the cross-sectional area, it is possible to avoid the decrease in the velocity of the air flow due to the rapid expansion of the flow cross-sectional area. In other words, the flow velocity of the swirling flow in the initial stage of the inflow from the inlet to the first space is faster than in the case where the rectifying unit is not provided. In addition, the direction of the swirling flow is induced by passing through the guide channel defined by the side wall, the cylinder portion, the partition plate portion, and the straightening portion. The efficiency of the separation of the liquid by the primary separation can be improved by these factors, that is, the flow velocity improvement of the swirling flow and the guidance of the swirling flow direction. The improved efficiency of the primary separation can reduce the amount of liquid to be separated by the secondary separation by the liquid separation element. As a result, it is possible to extend the service life of the liquid separation element, and to reduce the possibility of problems such as clogging of the liquid separation element.

  The cross-sectional area of the guide channel in the direction orthogonal to the flow direction of the gas is smaller than the cross-sectional area in the direction perpendicular to the flow direction of the gas in the cylinder, and is orthogonal to the flow direction of the gas in the cylinder The cross-sectional area in the direction of movement is preferably smaller than the cross-sectional area of the cross-section of the container.

  With this configuration, in the gas-liquid separator of the type in which the liquid separation element is not provided inside the cylinder, the cross-sectional area in the direction orthogonal to the flow direction of the gas in the cylinder becomes relatively large. An increase in the flow velocity of the gas flow (upflow) is suppressed. By keeping the flow rate of the upflow low, it becomes easy for the liquid contained in the gas to fall to the lower side of the container by gravity, and the efficiency of the primary separation is further improved.

  The gas-liquid separator is in fluid communication with the space on the upstream side of the liquid separation element, and is closed when the pressure of the gas at the communication position is less than the threshold, and is open when the pressure is at or above the threshold. The valve may further include a safety valve that opens the connection channel to the atmosphere.

  As described above, the efficiency of the primary separation is enhanced by the swirling flow passing through the guide flow passage having a limited flow passage cross-sectional area defined by the flow straightening unit. Furthermore, the flow rate of the upflow can be kept low by adopting a gas-liquid separator of a type in which no liquid separation element is provided inside the cylinder. Therefore, when the safety valve in fluid communication with the connection flow path, that is, the safety valve connected upstream of the liquid separation element is opened, the amount of liquid discharged into the atmosphere along with the gas is effectively It can be reduced.

  The safety valve is provided upstream of the liquid separation element in the path through which the liquid flows. Therefore, it is possible to prevent the pressure downstream of the liquid separation element from being sharply reduced when the safety valve is opened, and the rapid increase in the flow velocity of the gas passing through the liquid separation element can be avoided. The rapid increase in the flow velocity of the gas passing through the liquid separation element may cause problems such as a decrease in the efficiency of liquid separation by the liquid separation element, an outflow of the liquid accordingly, and a failure of the liquid separation element itself. These problems can be prevented by avoiding a rapid rise in the flow velocity of the gas passing through the liquid separation element.

  The cross-sectional area of the guide channel in the direction orthogonal to the gas flow direction may be constant from the inlet to the outlet. In addition, the cross-sectional area of the guide flow channel in the direction orthogonal to the direction in which the gas flows may be gradually increased from the inlet to the outlet. As the cross-sectional area of the guide channel gradually increases toward the outlet, the flow velocity of the swirling flow flowing in the guide channel becomes relatively high on the inlet side, and centrifugally more effectively on the inlet side of the guide channel. Force can separate liquid from gas. As a result, the amount of the liquid contained in the upward flow in the cylinder, that is, the gas contained in the secondary separation by the liquid separation element, and the liquid contained in the gas discharged to the atmosphere when the safety valve is opened can be ensured more reliably. It can be reduced.

  It is preferable that the straightening unit be provided such that the outlet of the guide channel is located behind the cylindrical portion when viewed from the inlet.

  With this configuration, that is, the configuration in which the flow straightening section has a sufficient length in the flow direction of the swirling flow, it is possible to ensure the efficiency improvement of the primary separation by the flow velocity improvement of the swirling flow in the guide channel described above Can be realized.

  Preferably, the straightening portion has an inner edge connected to the cylindrical portion, and an outer edge has a gap between the straight portion and the side wall.

  With this configuration, the liquid separated in the guide channel at the time of primary separation and attached to the side wall moves downward through the gap between the outer edge of the straightening portion and the side wall and is recovered. That is, it is possible to prevent the liquid separated in the primary separation from remaining in the guide channel.

  The straightening unit may be inclined downward from the cylindrical portion toward the side wall.

  With this configuration, the liquid adhering to the straightening unit at the time of primary separation flows toward the gap between the outer edge and the side wall of the straightening unit by gravity, and moves downward through the gap to be collected through the gap. That is, it is possible to more reliably avoid the remaining of the liquid separated in the primary separation in the guide channel.

  According to a second aspect of the present invention, there is provided an oil-cooled compressor body, an oil separator for separating oil from gas compressed by the compressor body, and a safety valve capable of opening the inside of the oil separator to the atmosphere. The oil separator has a cylindrical shape with a bottom, and is defined by a container into which a gas containing oil compressed by the compressor body is introduced from an inlet, the container, and the partition portion. And a cylindrical portion at both ends which is disposed in the first space, which extends downward from the partition, and is spaced from the side wall of the container, and protrudes from the cylindrical portion toward the side wall And, along with the side wall, the cylindrical portion, and the partition plate portion, define a guiding flow path through which the gas introduced from the introduction port flows, and the guiding flow path extends along the side wall in plan view. Has an outlet opening to the first space on the side opposite to the side where the inlet is located. A flow straightening unit, a closing unit closing the side of the guide channel where the inlet is located, and a casing provided above the partition plate and defining a second space together with the partition plate; An oil separation element disposed in the second space, a connection flow path for fluidly connecting the inside of the cylindrical portion and the second space, and an outlet for letting the gas having passed through the oil separation element flow out; The safety valve is in fluid communication with the upstream side of the oil separation element, and is closed when the pressure of the gas at the communication position is less than a threshold, and is opened when the pressure is at or above the threshold. An oil-cooled compressor is provided to open the connection flow path to the atmosphere.

  According to the present invention, the present invention provides a primary separation in a gas-liquid separator including a container for primary separation of liquid from gas by centrifugal force, and a liquid separation element for secondary separation of liquid from gas after primary separation. Improve the efficiency of

BRIEF DESCRIPTION OF THE DRAWINGS The systematic diagram of a compressor provided with the oil separator (gas-liquid separator) which concerns on embodiment of this invention. Longitudinal sectional view of an oil separator. The enlarged view of the part III of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.

  FIG. 1 shows an oil-cooled compressor 2 provided with an oil separator (gas-liquid separator) 1 according to an embodiment of the present invention. The oil-cooled compressor 2 includes a compressor body 3 which is an oil-cooled compressor (in the present embodiment, a screw compressor).

  The compressor body 3 compresses the air sucked from the suction port 3a and discharges the compressed air from the discharge port 3b. Liquid oil for lubrication and cooling is supplied to the compressor body 3 via the oil supply channels 4 and 5. Therefore, the compressed air discharged from the discharge port 3a contains oil. The discharge port 3 a is fluidly connected to one end of the discharge flow path 6, and the other end of the discharge flow path 6 is fluidly connected to the inlet 21 c of the oil separator 1.

  The compressed air discharged from the discharge port 3 a of the compressor body 3 passes through the discharge flow path 6 and is introduced into the oil separator 1 from the inlet 21 c. The air introduced into the oil separator 1 is discharged from the outlet 41 a through primary separation by centrifugal force in the container 21 and subsequent secondary separation by capture by the oil separation element 35. One end of the supply channel 7 is fluidly connected to the outlet 41 a. The other end of the supply flow path 7 is fluidly connected to a demand facility (for example, a pneumatic device) not shown. The air after oil separation, which is led out from the outlet 41 a of the oil separator 1, is delivered to the demand facility through the supply flow path 7. A pressure holding check valve 8 and an air cooler (heat exchanger) 9 are provided in the supply flow path 7.

  The oil primarily separated in the oil separator 1 is temporarily stored in an oil sump 24. The oil reservoir 24 is fluidly connected to the compressor body 3 via the oil supply passage 4. The oil in the oil reservoir 24 is returned to the compressor body 3 through the oil supply passage 4 by the pressure difference between the compressor body 3 and the oil separator 1. The oil supply channel 4 is provided with an oil cooler (heat exchanger) 10 and an oil filter 11 for removing foreign matter and the like. Moreover, the bypass flow path 12 which bypasses the oil cooler 10 is provided. The three-way valve 13 can switch between the state where the oil from the oil reservoir 24 passes through the oil cooler 10 and the state where it does not pass through the oil cooler 10 but passes through the bypass flow passage 12. By this switching, the temperature of the oil supplied to the compressor body 3 is controlled.

  The oil secondarily separated in the oil separator 1 is temporarily stored in the oil reservoir 40. The oil reservoir 40 is fluidly connected to the compressor body 3 via the oil supply passage 5. The oil in the oil reservoir 40 is returned to the compressor body 3 through the refueling channel 5 by the pressure difference between the compressor body 3 and the oil separator 1. A check valve 14 is provided in the refueling flow passage 5.

  Hereinafter, the structure of the oil separator 1 will be described with further reference to FIGS. 2 to 4.

  The oil separator 1 comprises a container 21. The container 21 in the present embodiment is generally cylindrical with an elongated one-end opening, and includes a circular bottom wall 21a and a cylindrical side wall 21b extending from the bottom wall 21a. The upper end opening of the side wall 21 b is closed by the partition plate portion 22. An inlet 21c (the discharge channel 6 is connected as described above) of the air compressed by the compressor body 3 is provided on the upper side of the side wall 21b (a position relatively close to the partition plate portion 22). ing.

  The side wall 21 b of the container 21, the bottom wall 21 a of the container 21, and the partition plate portion 22 define a first space 23 which is a sealed space. The lower part of the first space 23, that is, the space near the bottom wall 21 a of the container 21 constitutes an oil reservoir 24.

  A cylindrical body (cylindrical portion) 25 which is open at both ends is disposed in the first space 23. The upper end of the cylindrical body 25 is fixed to the partition plate portion 22 and extends downward toward the bottom wall 21 a of the container 21. The lower end of the cylindrical body 25 is located above the bottom wall 21 a of the container 21 sufficiently far away. As shown most clearly in FIG. 4, the cylindrical body 25 is spaced apart and coaxial with the side wall 21 b of the container 21. A space 26 is provided between the cylindrical body 25 and the side wall 21b. Inside the cylindrical body 25, no member or element (for example, an element such as an oil separation element 35 described later) is disposed.

  A rectifying plate (rectifying portion) 27 is disposed in the first space 23, more specifically, in a space 26 between the cylindrical body 25 and the side wall 21 b of the container 21. The straightening vane 27 in the present embodiment is in the form of a band plate curved in a substantially arc shape in plan view. The curvature of the inner edge 27 a of the straightening plate 27 in plan view is set to be substantially the same as the curvature of the cylindrical body 25 in plan view. The curvature of the outer edge 27b of the straightening plate 27 in plan view is set to be substantially the same as the curvature of the side wall 21b of the container 21 in plan view. The inner edge 27 a of the straightening vane 27 is fixed to the cylindrical body 25, and there is no gap between the inner edge 27 a of the straightening vane 27 and the cylindrical body 25. On the other hand, the outer edge 27 b of the straightening vane 27 is positioned adjacent to the side wall 21 b of the container 21. That is, the flow control plate 27 protrudes from the cylindrical body 25 toward the side wall 21 b. The straightening vane 27 in the present embodiment protrudes generally horizontally from the cylindrical body 25 toward the side wall 21b, and the upper surface of the straightening vane 27 has substantially no inclination with respect to the horizontal plane. A slight gap 28 is provided between the outer edge 27 b of the straightening vane 27 and the side wall 21 b of the container 21.

  As shown in FIG. 4, in plan view, the straightening vane 27 extends along the side wall 21 b in a direction (see arrow F) in which air is introduced from the inlet 21 c. A partially annular guide channel 29 is defined in plan view by the inner surface of the side wall 21 b of the container 21, the lower surface of the partition plate portion 22, and the upper surface of the rectifying plate 27.

  One end side of the guide channel 29, that is, the end 27c side of the straightening vane 27 on the inlet 21c side is a closing plate at a position opposite to the direction of the introduction of air to the inlet 21c (see arrow F). (Closed part) 30 is closed. The closing plate 30 is in contact with the outer surface of the cylindrical body 25, the inner surface of the side wall 21 b, the lower surface of the partition plate portion 22, and the upper surface of the rectifying plate 27. At the other end side of the guide flow passage 29, that is, at the end 27 cb opposite to the inlet 21 c of the flow straightening plate 27, the guide flow passage 29 has an outlet 29 a opened to the first space 23. As shown in FIG. 4, in the present embodiment, the closing plate 30 extends in the tangential direction of the cylindrical body 25 in plan view. As indicated by a two-dot chain line in the same drawing, the closing plate 30 may extend in the radial direction of the cylindrical body 25 in a plan view.

  Referring to FIG. 4, in the present embodiment, the end 27 c on the inlet 21 c side and the end 27 d on the outlet 29 a side of the straightening vane 27 are cylindrical bodies in plan view. The angle .theta.1 made about the common center or axis Ax between 25 and the side wall 21b is set to be 180 degrees.

  The cross-sectional area of the guide flow channel 29 in the direction orthogonal to the air flow direction (conceptually shown by symbol A1 in FIG. 3) is the cross-sectional area of the cross section of the container 21 (conceptally shown by symbol A3 in FIG. 3) It is set smaller than enough. Further, the cross-sectional area A1 of the guide flow passage 29 is set smaller than the cross-sectional area in the direction in which the air in the cylindrical body 25 flows (shown conceptually in FIG. 3 by the symbol A2). Furthermore, the cross-sectional area A2 in the cylindrical body 25 is set smaller than the cross-sectional area A3 of the container 21. That is, the cross sections A1, A2, and A3 have the following relationships.

              A1 <A2 <A3

  The casing 31 is fixed to an upper portion of the partition plate portion 22. The casing 31 and the partition plate portion 22 define a second space 32 which is a sealed space. The partition plate portion 22 is provided with a through hole (connection flow path) 22a, and the inside of the cylindrical body 25 and the second space 32 are in fluid communication via the through hole 22a.

  An oil separation element (liquid separation element) 35 is disposed in the second space 32. The oil separation element 35 in the present embodiment is generally in the form of an elongated cylindrical shape with both ends open, and a gap 36 is provided between the circumferential surface thereof and the casing 31. The upper and lower end portions of the oil separation element 35 are closed by the upper end plate portion 37 and the lower end plate portion 38, respectively. The upper end plate portion 37 and the lower end plate portion 38 are connected by a rod 39 inserted into the oil separation element 35. An inner portion of the oil separation element 35 in the upper surface of the lower end plate portion 38 constitutes an oil reservoir 40. Further, in the lower end plate portion 38, a recess 41 is formed in an inner portion of the oil separation element 35. The lower end of the lead-out pipe 42, which is a circular pipe in the present embodiment, which is a circular pipe in the present embodiment, is closely fitted in the recess 41. Further, the recess 41 is provided with the above-described outlet 41 a (the supply flow channel 7 is connected as described above).

  The partition plate portion 22 is provided with an air release port 22 b whose one end is fluidly connected to the through hole 22 a. A safety valve 45 is fluidly connected to the other end of the aeration port 22b. The safety valve 45 opens and closes in accordance with the pressure of the air discharge port 22 b, that is, the pressure detected by the pressure sensor 46 that detects the pressure in the through hole 22 a (connection flow path). Specifically, the safety valve 45 maintains the closed state if the pressure detected by the pressure sensor 46 is less than the threshold, and opens when the pressure detected by the pressure sensor 46 becomes equal to or greater than the threshold, and the through hole 22a (connected Open the flow path to the atmosphere.

  Next, the function of the oil separator 1 will be described.

  The air introduced into the first space 23 in the container 21 from the inlet 21 c flows downward as swirl flow along the side wall 21 b of the container 21. The oil contained in the air is separated by centrifugal force, adheres to the side wall 21b, falls along the side wall 21b, and is collected in the oil reservoir 24 below the container 21 (primary separation). After reaching the lower side of the container 21, the air rises and enters the cylindrical body 25 from the lower end of the cylindrical body 25. The air ascends in the cylindrical body 25 and flows into the second space in the casing 31 through the through hole 22a. The gas flowing into the second space 32 passes through the oil separation element 35 from the outside to the inside after rising the gap 36. During this passage, the oil contained in the air is separated from the air by being captured by the oil separation element 35 (secondary separation). The oil captured by the oil separation element 35 is collected in an oil sump 40. The air that has passed from the outside to the inside of the oil separation element 35 enters the outlet pipe 42 from the upper end of the outlet pipe 42 and is further delivered from the outlet 41 a to the supply flow path 7 through the recess 41.

  The air in the initial stage of introduction into the first space 23 from the inlet 21 c has a guide channel 29 defined by the side wall 21 b, the partition plate portion 22, and the straightening plate 27, that is, a cross sectional area A2 in a cross section of the container 21. It passes through a flow path having a cross-sectional area A1 sufficiently smaller than that. Therefore, it is possible to avoid the decrease in the speed of the air flow caused by the flow path cross-sectional area rapidly expanding when introduced into the first space 23 from the inlet 21c. In other words, the flow velocity of the swirling flow at the initial stage of the inflow from the inlet 21 c to the first space 23 is faster than in the case where the rectifying plate 27 is not provided. Moreover, the direction of the swirling flow is induced by passing through the guide channel 29 having the limited cross-sectional area A1. The efficiency of the oil separation by the primary separation can be improved by these factors, that is, the flow velocity improvement of the swirling flow and the guidance of the swirling flow direction. By improving the efficiency of the primary separation, the amount of oil to be separated by the secondary separation by the oil separation element 35 can be reduced. As a result, the service life of the oil separation element 35 can be extended, and the possibility of occurrence of problems such as clogging of the oil separation element 35 can be reduced.

  As described above, the gap 28 is provided between the outer edge 27 b of the flow straightening plate 27 and the inner surface of the side wall 21 b of the container 21. Therefore, the oil separated in the guide flow passage 29 at the time of primary separation and attached to the side wall 21 b moves downward of the container 21 through the gap 28 and is collected in the oil reservoir 24. That is, by providing the gap 28, it is possible to avoid that the oil separated by the primary separation remains in the guide channel 29.

  As described above, the cross-sectional area A2 in the cylindrical body 25 is set smaller than the cross-sectional area A3 of the container 21, but is set sufficiently larger than the cross-sectional area A1. Therefore, the flow velocity of the air flow (rising flow) rising in the cylindrical body 25 is greatly reduced as compared with the flow velocity of the air flow in the guide channel 29. In addition, since this is a gas-liquid separator of a type in which no liquid separation element is provided inside the cylinder, an increase in the flow velocity of the air entering the cylindrical body 25 is also suppressed, and the upward flow velocity is low. Get down. The low flow rate of the upflow makes it easy for the oil contained in the air to fall to the lower side of the container 21 by gravity, and the efficiency of the primary separation is further improved.

  When the safety valve 45 is opened, air in the oil separator 1, specifically, upstream of the oil separation element 35 is discharged to the atmosphere. However, as the swirling flow passes through the guide channel 29 having the cross-sectional area A1 limited as described above, the efficiency of the primary separation is enhanced. Therefore, when the safety valve 45 connected upstream of the oil separation element 35 is opened, the amount of oil discharged into the atmosphere together with the air can be effectively reduced.

  The safety valve 45 is provided upstream of the oil separation element 35. Therefore, when the safety valve 45 is opened, the pressure downstream of the oil separation element 35 sharply decreases and the flow velocity of air passing through the oil separation element 35 You can avoid a surge. The rapid increase in the flow velocity of the air passing through the oil separation element 35 may cause a decrease in the efficiency of oil separation by the oil separation element 35 and a failure such as an oil spill or failure of the oil separation element 35 itself. These problems can be prevented by avoiding the rapid increase of the air flow velocity passing through the oil separation element 35 when the safety valve 45 is opened.

  In the present embodiment, the cross-sectional area A1 of the guide channel 29 is constant from the inlet 21c to the outlet 29a. The cross-sectional area A1 of the guide flow passage 29 may be gradually increased from the inlet 21c toward the outlet 29a. By gradually increasing the cross-sectional area A1 of the guide channel 29 toward the outlet 29a, the flow velocity of the swirling flow flowing through the guide channel 29 becomes relatively high on the inlet 21c side, and the inlet 21c of the guide channel 29. On the side can more effectively separate oil from air by centrifugal force. As a result, the amount of oil contained in the upward flow in the cylindrical body 25, that is, the amount of oil contained in the air provided for secondary separation by the oil separation element 35 and the air discharged to the atmosphere when the safety valve 45 is opened. Can be reduced more reliably.

  Referring to FIG. 4, as described above, in the present embodiment, the positions of the end 27 c on the inlet 21 c side and the end 27 d on the outlet 29 a side in plan view are The angle θ1 between 27c and 27d is set to be 180 degrees. Preferably, the end 27d of the straightening plate 27, that is, the position of the outlet 29a of the guide channel 29, is set at least at a position P hidden behind the cylindrical body 25 when viewed from the inlet 21c (in this case, the end 27c). , 27d are conceptually shown by the symbol .theta.2). The flow rate improvement of the swirling flow in the guide flow path 29 and the swirling flow of the guide flow path 29 are configured by setting the end portion 27d of the flow straightening plate 27 to such a position, that is, having a sufficient length in the flow direction of the swirling flow. The efficiency improvement of the primary separation by direction induction can be realized more reliably.

  Referring to FIG. 3, as described above, the straightening vanes 27 in the present embodiment project in a substantially horizontal direction from the cylindrical body 25 toward the side wall 21 b. As shown by a two-dot chain line (symbol .delta.) In FIG. 3, the flow straightening plate 27 is inclined downward from the cylindrical body 25 to the side wall 21b, that is, the outer edge 27b of the flow straightening plate 27 is positioned below the inner edge 27a. It may be a configuration. In such a configuration, oil adhering to the upper surface of the flow straightening plate 27 at the time of primary separation flows toward the gap 28 between the outer edge 27b and the side wall 21b of the flow straightening plate 27 by gravity and passes through the gap 28 to collect oil. Descent to 24 That is, with this configuration, it is possible to more reliably prevent the oil separated in the primary separation from remaining in the guide channel 29. In addition, as for the distance of the clearance gap 28, it is desirable to set in the range of 2 mm or more and 5 mm or less. A minute gap such as less than 2 mm is likely to remain in the guide channel 29 because a liquid (for example, oil) is difficult to pass through, and a gap larger than 5 mm has a large amount of gas leakage. It is not desirable because the problem of the flow rate decrease in In consideration of the balance between the elimination of the liquid remaining in the guide channel 29 and the avoidance of the decrease in the flow velocity, the distance of the gap 28 is more preferably set in the range of 2 mm or more and 4 mm or less. The gap 28 set within the above-mentioned desirable range may be provided at least at a position where the liquid tends to remain in the guide channel 29, and in the position where the problem of the liquid remains does not occur. Installation may be omitted.

  As mentioned above, although specific embodiment and its modification of the present invention were described, the present invention is not limited to the above-mentioned form, and can be variously changed and carried out within the scope of the present invention.

1 Oil separator (gas-liquid separator)
Reference Signs List 2 oil-cooled compressor 3 compressor main body 3a suction port 3b discharge port 4, 5 oil supply channel 6 discharge channel 7 supply channel 8 pressure check valve 9 air cooler 10 oil cooler 11 oil filter 12 bypass flow Path 13 Three-way valve 14 Check valve 21 Container 21a Bottom wall 21b Side wall 21c Introduction port 23 First space 24 Oil reservoir 22 Partition plate part 22a Through hole (connection flow path)
22b Air vent port 25 cylindrical body (tube portion)
26 Space 27 Rectifying plate (Rectifying part)
27a inner edge 27b outer edge 27c, 27d end 28 gap 29 guide channel 29c outlet 30 closing plate (closing portion)
31 casing 32 second space 35 oil separation element (liquid separation element)
36 gap 37 upper end plate portion 38 lower end plate portion 39 rod 40 oil reservoir 41 recessed portion 41 a outlet port 42 outlet pipe 45 safety valve 46 pressure sensor

Claims (9)

A bottomed cylindrical container into which a gas containing liquid is introduced from the inlet;
A cylindrical portion at both ends, which is disposed in a first space defined by the container and the partition, extends downward from the partition, and is spaced from the side wall of the container;
A guide which protrudes from the cylindrical portion toward the side wall and extends along the side wall in a plan view and flows the gas introduced from the inlet together with the side wall, the cylindrical portion, and the partition plate portion A flow straightening unit which defines a flow passage, and the guide flow passage has an outlet opened to the first space on the opposite side to the side where the inlet is located;
A closing part for closing the side of the inlet channel of the guide channel;
A casing provided above the partition plate portion and defining a second space together with the partition plate portion;
A liquid separation element disposed in the second space;
A connection flow passage that fluidly connects the inside of the cylinder portion and the second space;
And an outlet for discharging the gas having passed through the liquid separation element to the outside. The cross-sectional area of the guide channel in the direction orthogonal to the flow direction of the gas is smaller than the cross-sectional area in the direction perpendicular to the flow direction of the gas in the cylinder portion,
The gas-liquid separator according to claim 1, wherein a cross-sectional area in a direction orthogonal to a flow direction of the gas in the cylinder portion is smaller than a cross-sectional area of a cross section of the container.   It is in fluid communication with the space on the upstream side of the liquid separation element, and the gas is closed if the pressure of the gas at the communicated position is less than the threshold, and it is opened when the pressure is equal to or more than the threshold. The gas-liquid separator according to claim 1, further comprising a safety valve that opens the passage to the atmosphere.   The gas-liquid separator according to any one of claims 1 to 3, wherein a cross-sectional area of the guide flow channel in a direction orthogonal to the flow direction of the gas is constant from the inlet to the outlet.   The gas-liquid separator according to any one of claims 1 to 3, wherein a cross-sectional area of the guide flow passage in a direction orthogonal to the flow direction of the gas gradually increases from the inlet to the outlet. .   The air according to any one of claims 1 to 5, wherein the straightening unit is provided such that the outlet of the guide flow passage is located behind the cylindrical portion when viewed from the inlet. Liquid separator.   The gas-liquid separator according to any one of claims 1 to 6, wherein the straightening unit has an inner edge connected to the cylindrical portion and an outer edge has a gap between the inner edge and the side wall.   The gas-liquid separator according to claim 7, wherein the straightening unit is inclined downward from the cylindrical portion toward the side wall. An oil-cooled compressor body,
An oil separator for separating oil from the gas compressed by the compressor body;
A safety valve capable of opening the inside of the oil separator to the atmosphere;
The oil separator is
A bottomed cylindrical container into which a gas containing oil compressed by the compressor body is introduced from an inlet;
A cylindrical portion at both ends, which is disposed in a first space defined by the container and the partition, extends downward from the partition, and is spaced from the side wall of the container; ,
A guide which protrudes from the cylindrical portion toward the side wall and extends along the side wall in a plan view and flows the gas introduced from the inlet together with the side wall, the cylindrical portion, and the partition plate portion A flow straightening unit which defines a flow passage, and the guide flow passage has an outlet opened to the first space on the opposite side to the side where the inlet is located;
A closing part for closing the side of the inlet channel of the guide channel;
A casing provided above the partition plate portion and defining a second space together with the partition plate portion;
An oil separation element disposed in the second space;
A connection flow passage that fluidly connects the inside of the cylinder portion and the second space;
And an outlet for discharging the gas having passed through the oil separation element to the outside.
The safety valve is in fluid communication with the upstream side of the oil separation element, and is closed if the pressure of the gas at the communicated position is less than a threshold, and is opened when the pressure is equal to or greater than the threshold. An oil-cooled compressor that opens the connection flow path to the atmosphere.

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