JP2011041920A - Oil separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve the oil separation performance of an oil separator. <P>SOLUTION: A base 10 is provided which includes a lead-in passage 12 for leading in an oil-containing gas, a lead-out passage 13 for leading out treated gas and an oil discharge passage 14 for discharging separated cooled oil, and a cover 20 is mounted on the base 10 to form an oil separation chamber 21. A ring-shaped filter element 30 and a lead-out pipe 40 whose upper end opens in the filter element 30 are disposed in the oil separation chamber 21. The lead-in passage 12 communicates with the oil separation chamber 21 between the cover 20 and the filter element 30, the lead-out passage 13 communicates with the lower end of the lead-out pipe 40, and the oil discharge passage 14 communicates with an oil discharge port 16 which opens in a space inside the filter element 30. A step portion comprising a small-diameter portion 42 and a large-diameter portion 43 formed on the outer periphery in the axial cross section of the lead-out pipe 40 is formed on the outer peripheral part of the lead-out pipe 40 located at a position higher than a position at which the oil discharge port 16 is formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil separator used for separating and removing oil contained in a gas, and passes through a gas containing oil, for example, compressed gas after cooling oil is primarily separated in a receiver tank of an oil-cooled compressor. It is related with the oil separator which can isolate | separate and remove the oil component contained in this gas by doing.

  As an example of the case where separation and removal of the oil contained in the gas is necessary, separation and removal of the oil from the compressed gas generated in the compressor body of the oil-cooled compressor can be exemplified.

  In other words, in the oil-cooled compressor, the cooling oil is introduced into the working space of the compressor body for the purpose of sealing and cooling the working space. The main body discharges compressed gas in the state of a gas-liquid mixed fluid with cooling oil.

  For this reason, in such an oil-cooled compressor, the compressed gas discharged from the compressor main body cannot be supplied as it is to the consumer side connected to the air working machine or the like. The oil is separated and removed so that clean compressed gas from which oil has been removed can be supplied to the consumer.

  In order to perform such separation and removal of the cooling oil, in general, the oil-cooled compressor 70 includes a receiver tank 74 and an oil separator between the discharge port of the compressor main body 72 and the consumption side as shown in FIG. 100, a compressed gas discharged in a gas-liquid mixed fluid state from a compressor main body 72 driven by a drive source 73 such as an engine or a motor is introduced into a receiver tank 74 to provide a primary coolant oil. In addition to the separation, the compressed gas after the primary separation of the cooling oil in the receiver tank 74 is further passed through the oil separator 100 and mixed in the compressed gas in the oil separator 100 in a mist state. The cooling oil is further separated and removed.

  The cooling oil collected in the receiver tank 74 is introduced into the oil cooler 79 using the pressure in the receiver tank 74 and cooled, and then introduced into the oil supply port 72a of the compressor main body 72, and again in the working space. The cooling oil that is used for cooling and sealing and separated and recovered by the oil separator 100 is separated into, for example, a separated oil recovery pipe 75 using the pressure in the oil separator 100 (discharge side pressure of the compressor main body 72). It is recovered in the working space of the compressor main body 72 via the oil recovery port 72b.

  Here, the oil separator 100 provided in the oil-cooled compressor 70 described above is configured as shown in FIG. 7 as an example.

  The oil separator 100 includes a base 110 attached to a receiver tank 74, a cylindrical cover 120 whose upper end is closed, a filter element 130 which is a cylindrical filter medium whose upper end is closed by an upper lid 132, and A lead-out pipe 140, which is a pipe material, and a cover presser 160 for fixing the cover 120 to the base 110 are provided. By attaching the lower end of the cover 120 on the base 110, the cooling oil is separated into the cover 120. An oil separation chamber 121 that is a space for forming the filter element 130 is formed, and the filter element 130 is accommodated in the oil separation chamber 121 formed as described above, and further inserted into the filter element 130 from the lower end side of the filter element 130. The upper end of the outlet pipe 140 is opened.

  In the base 110, the compressed gas in the receiver tank 74 is introduced into the oil separation chamber 121, and the compressed gas after the oil is separated and removed in the oil separation chamber 121 to the consumption side. A lead-out path 113 for leading out and an oil discharge path 114 for discharging the cooling oil separated in the oil separation chamber 121 to the outside of the oil separator 100 are provided, respectively, and the introduction path 112 among them is connected with the oil The separation chamber 121 communicates with the space between the cover 120 and the filter element 130 from the lower end side, communicates the outlet passage 113 with the lower end of the outlet tube 140, and further connects the oil discharge passage 114 to the lower end of the filter element 130. It communicates with an oil discharge port 116 located on the side and opened in the filter element 130 (see Patent Documents 1 to 3).

  In the oil separator 100 configured as described above, when the compressed gas in the receiver tank 74 is introduced into the space between the cover 120 and the filter element 130 in the oil separation chamber 121 via the introduction path 112, the compressed gas is filtered. It passes through the element 130, is introduced into the inner peripheral side of the filter element 130, is further introduced into the lead-out pipe 140 through the upper end opening of the lead-out pipe 140, and passes through the lead-out path 113 communicating with the lower end of the lead-out pipe 140. Supplied to the consumer side.

  The compressed gas introduced into the outlet pipe 140 is separated from the cooling oil contained in the mist state in the compressed gas when it passes through the filter element 130 and is removed. Thus, it is possible to supply a clean compressed gas from which the gas is removed.

  On the other hand, the cooling oil separated and removed from the compressed gas when passing through the filter element 130 is accumulated in a space between the inner periphery of the filter element 130 and the outer periphery of the outlet pipe 140, and the oil discharge port 116 opened in this space. , The oil is discharged to the outside of the oil separator 100 through the oil discharge passage 114 communicating with the oil discharge port 116, and acts as an example through the oil recovery port 72b of the compressor main body 72 as described with reference to FIG. It is collected in the space.

JP-A-5-317630 Japanese Utility Model Publication No. 5-047450 JP 7-500167

  In the configuration of the conventional oil separator 100 configured as described above, the outlet pipe 140 has the inner periphery of the filter element 130 and the outlet pipe so that the cooling oil separated by the filter element 130 is not sucked together with the compressed gas. The upper end is opened at a sufficiently high position with respect to the position that can be the oil level of the cooling oil accumulated between the outer circumferences of 140.

  However, the compressed gas from the receiver tank 74 introduced into the space between the cover 120 and the filter element 130 passes through the filter element 130 as described above and is led out of the oil separation chamber 121 from the upper end of the outlet pipe 140. Therefore, a part of the cooling oil adhering to the filter element 130 is blown off by the pressure of the compressed gas passing through the filter element 130, and oil droplets adhere to the outer peripheral surface of the outlet pipe 140.

  On the other hand, the compressed gas introduced between the cover 120 and the filter element 130 from the lower end side of the oil separation chamber 121 moves upward in the oil separation chamber 121 toward the upper end of the outlet pipe 140 as indicated by an arrow in FIG. Therefore, when the cooling oil adheres to the outer peripheral surface of the outlet pipe 140 as described above, the cooling oil is pushed up by the flow of the compressed gas, so that the oil flows upward along the surface of the outlet pipe 140. Moving.

  Therefore, when the cooling oil pushed up in this way reaches the upper end of the lead-out pipe 140, it is drawn into the lead-out pipe 140 together with the compressed gas flowing into the lead-out pipe 140. The cooling oil drawn in is supplied to the consumer side along with the compressed gas.

  However, in the conventional oil separator 100, no consideration is given to the cooling oil supplied to the consumption side through the outer peripheral surface of the outlet pipe 140 as described above. It is not equipped with the structure which prevents.

  On the other hand, if mixing of the cooling oil as described above with respect to the compressed gas supplied to the consumer side can be prevented, the oil separation performance of the oil separator 100 can be improved and the compressed gas supplied to the consumer side It is possible to further reduce the oil content contained in.

  Therefore, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and with a relatively simple configuration, the cooling oil adhering to the surface of the outlet pipe is mixed into the compressed gas supplied to the consumer side. The purpose of this is to further improve the oil separation performance of the oil separator and to provide a clean gas with less oil content.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, it is used in a limited manner for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, an oil separator 1 according to the present invention is an oil separator 1 for treating a gas containing an oil component, separating and removing the oil component from the gas,
A base 10 on which an introduction path 12 for introducing a gas to be treated, a lead-out path 13 for deriving a gas whose oil content has been removed, and an oil discharge path 14 for discharging separated oil are provided,
A cylindrical cover 20 whose upper end is closed is attached on the base 10, an oil separation chamber 21 is formed inside the cover 20, and an annular filter element 30 is formed in the oil separation chamber 21. In the filter element 30, an outlet pipe 40 having an upper end is disposed, and
The introduction path 12 is communicated with the oil separation chamber 21 between the cover 20 and the filter element 30, the outlet path 13 is communicated with the lower end of the outlet pipe 40, and the filter is disposed at the lower end side of the filter element 30. The oil discharge passage 14 is communicated with the oil discharge port 16 opened in the space inside the element 30,
Further, the outer periphery of the outlet pipe 40 and a portion located above the oil outlet 16 formation position, that is, at a high position with respect to the oil outlet 16 in the space after passing through the filter element 30. In addition, a step portion 41 (41a, 41b, 45, 47) including a small diameter portion 42 on the outer periphery and a large diameter portion 43 having a relatively larger diameter than the small diameter portion 42 in the cross section in the axial direction of the outlet pipe 40. For example, in the circumferential direction of the lead-out pipe 40, for example, in an annular shape or a spiral shape.

  In the oil separator 1 having the above-described configuration, the step portion 41 is preferably a step portion 41a having a shape protruding in an overhang shape on the outer peripheral side of the outlet pipe 40 (Claim 2).

  Further, the step portion 41 can be provided by forming a groove 45 (for example, an annular groove) on the outer periphery of the outlet pipe 40 (Claim 3).

  Alternatively, the step portion 41 may be provided by forming a flange 46 on the outer periphery of the outlet pipe 40 (claim 4).

  The step portion 41 is preferably provided in the vicinity of the upper end of the outlet pipe 40 (Claim 5).

  Furthermore, a plurality of the step portions 41 may be provided in the height direction of the outlet pipe 40 (claim 6).

  With the configuration described above, the oil separator 1 of the present invention has the following remarkable effects.

  By forming the aforementioned step portion 41 on the outer periphery of the outlet pipe 40 located at a higher position than the position where the oil discharge port 16 is formed, the cooling oil adhering to the outer periphery of the outlet pipe 40 is transferred to the oil separation chamber 21. Even in the case where it was pushed up by the gas flow flowing inside and rose along the surface of the outlet pipe 40, the rise of the cooling oil could be stopped by the step portion 41 (41a, 41b).

  As a result, it is possible to suitably prevent the cooling oil from entering the lead-out pipe 40 through the upper end opening of the lead-out pipe 40, and the oil can be formed by a relatively simple configuration in which the step portion 41 is formed in the lead-out pipe 40. The oil separation performance of the separator 1 could be improved.

  When the step portion 41 is a step portion 41a formed so as to protrude in an overhang shape on the outer peripheral side of the outlet pipe 40, the cooling oil rising upward from below cannot get over the step portion 41a. The rise of the cooling oil transmitted along the outer periphery of the outlet pipe 40 could be prevented more reliably.

  In the configuration in which the step portion 41 (41a and 41b) is provided by forming a groove 45 on the outer periphery of the outlet pipe 40, for example, in order to form a groove in the outlet pipe provided in a known oil separator The oil separator 1 of the present invention could be easily manufactured by adding only one step.

  Further, when the step portion 41 (41a, 41b) is formed by the groove 45 as described above, even when the relatively shallow groove 45 is formed by adjusting the groove width to an appropriate interval, The cooling oil that has entered the groove 45 can be retained in the groove 45, and it is possible to reliably prevent the cooling oil from moving further upward beyond the groove 45.

  Further, when the step portion 41 (41a, 41b) is formed by the flange 46, the step δ (see the enlarged view in FIG. 2) in the step portion 41 (41a, 41b) may be made relatively large. The cooling oil reaching the step portion 41 can be made more difficult to rise.

  When the above-described step portion 41 (41a, 41b) is provided at a relatively low position of the lead-out pipe 40, the cooling oil is disposed on the outer periphery of the lead-out pipe 40 above the formation position of the step portion 41 (41a, 41b). However, the step 41 (41a, 41b) cannot regulate the rise of the cooling oil adhering to this position. However, the step 41 (41a, 41b) is connected to the outlet pipe. In the case where it is provided in the vicinity of the upper end of 40, or in the case where a plurality of the step portions 41 (41a, 41b) are provided in the height direction of the outlet pipe 40, such intrusion of cooling oil can be prevented. The oil separation performance of the separator could be further improved.

Sectional drawing of the oil separator of this invention. FIG. 2 is an enlarged view of a lead-out pipe portion in FIG. 1. Sectional drawing which shows the modification of the oil separator of this invention. Sectional drawing which shows another modification of the oil separator of this invention. It is a perspective view which shows the example of formation of a step part, (A), (B) is a groove | channel, (C), (D) is a flange, (E), (F) formed the step part by the outer diameter difference, respectively. An example is shown. Explanatory drawing which shows the whole structure of an oil-cooled compressor (common to this application and a prior art). Sectional drawing of the conventional oil separator.

  Below, the oil separator 1 of this invention is demonstrated, referring an accompanying drawing. In the following description, the oil separator 1 of the present invention will be described by taking as an example the case where the compressed gas after the cooling oil is primarily separated by the receiver tank 74 of the oil-cooled compressor is used as a processing target. The oil separator of the present invention is not limited to this example, and can be used in various scenes where the oil content needs to be removed from the gas.

  Reference numeral 1 in FIG. 1 denotes an oil separator according to the present application. The oil separator 1 includes a base 10, a cover 20 attached to the base 10, a filter element 30, and a lead-out pipe 40. .

  The base 10 described above is introduced into the oil separation chamber 21 (to be described later) through the introduction path 12 for introducing the gas containing the oil to be treated, and the oil is removed. A lead-out path 13 for leading the subsequent gas and an oil discharge path 14 for discharging the cooling oil separated in the oil separation chamber 21 are provided, and a receiver tank 74 of the oil-cooled compressor 70 is provided. In the present embodiment in which the compressed gas after the primary separation of the cooling oil is the target of processing, the above-described introduction path 12 is obtained by attaching the base 10 to the air outlet 74 a provided at the upper end of the receiver tank 74. Is configured to communicate with the space in the receiver tank 74, the above-described lead-out path 13 is communicated to the compressed gas consumption side via the check valve / pressure regulating valve 50, and the oil discharge path 14 is Low pressure for oil separation chamber 21 A position, for example, is used in a state in communication with the compressor body 72 of the oil recovery port 72b (see FIG. 6).

  In the illustrated embodiment, the above-described base 10 is shown as an example mounted on the receiver tank 74. However, the oil separator 1 of the present invention is not necessarily shown in the illustrated embodiment. The configuration is not limited to the configuration attached to the receiver tank 74, and the receiver tank 74 may be provided separately from the configuration.

  In addition, when incorporated into a device other than an oil-cooled compressor, etc., there are various methods for introducing a gas to be treated and the shape of the base 10 depending on each application, installation state, etc. Can be changed.

  A cylindrical cover 20 whose upper end is closed is attached to the upper part of the base 10, and the oil separation chamber 21 is formed in the cover 20.

  In the illustrated embodiment, a so-called cover-integrated filter element in which a filter element 30 to be described later is configured to be replaceable together with the cover 20, and the cover 20 and the filter element 30 with respect to the base 10 are configured. It can be attached and detached at the same time in one operation.

  In order to achieve such a cover-integrated configuration, in the illustrated embodiment, the upper and lower ends of the element body 31 that is a cylindrical filter medium are covered with an upper end plate 32 and a lower end plate 33, respectively. The formed filter element 30 is fixed, and the lower end plate 33 of the filter element 30 is fixed to the bottom plate 22 that closes the lower end of the cover 20, and the lower end portion of the cover 20 is closed by the bottom plate 22. The filter element 30 is fixed and accommodated.

  When the protruding portion 15 provided on the base 10 is inserted and screwed into the mounting hole 22a formed at the center of the bottom plate 22 that covers the bottom of the cover 20, the filter element 30 is attached together with the cover 20. And a compressed gas introduction hole 22b formed around the attachment hole 22a communicates the introduction path 12 provided in the base 10 with the oil separation chamber 21 formed in the cover 20, and the protrusion 15 A lead-out tube 40, which will be described later, is attached to the filter element 30.

  In the illustrated embodiment, the filter element 30 is replaced with the cover 20, and the oil separator 1 having the above-described cover-integrated filter element is described as an example. However, the configuration of the present invention is applied. The oil separator 1 is not limited to the oil separator 1 provided with such a cover-integrated filter element. For example, as shown in FIG. 3, the cover 20 and the filter element 30 are independently attached to the base 10. You may apply with respect to the oil separator 1 of the cover and filter element separation type comprised so that it might attach to.

  In the configuration shown in FIG. 3, when the cover 20 fixed to the base 10 is removed, the filter element 30 is exposed so that the filter element 30 can be replaced. While the bottom plate 22 for fixing the lower end plate 33 of the filter element 30 is not provided, the protruding portion 15 of the base 10 is provided with a structure to which the lower end portion of the filter element 30 can be attached.

  As shown in FIG. 1, the above-described protrusion 15 provided on the base 10 is formed in a cylindrical shape having an opening 15 a formed in the center, and the opening 15 a formed in the center of the protrusion 15 is in the opening 15 a. The lower end of the outlet pipe 40 having an upper end opened in the filter element 30 of the oil separation chamber 21 is inserted.

  In the opening 15a formed at the center of the projecting portion 15 of the base 10, a large-diameter portion d having a large diameter from the upper end to a predetermined depth as shown in an enlarged view in FIG. A small-diameter portion s formed below the large-diameter portion d and having a small diameter with respect to the large-diameter portion d is provided, and a lower end portion of the outlet pipe 40 inserted into the opening 15a is connected to the small-diameter portion s. When fitted to the portion s, the lower end of the outlet pipe 40 communicates with the outlet path 13 (lead lines d and s are drawn inside the outlet pipe 40 for the sake of drawing. ).

  Further, a gap of a predetermined interval is formed between the outer periphery of the outlet pipe 40 and the inner periphery of the large-diameter portion d of the opening 15a, and an oil discharge port 16 for discharging the separated cooling oil is formed by this gap. The oil discharge passage 14 formed in the side wall of the large-diameter portion d and the oil discharge port 16 communicate with each other so that the cooling oil separated by the filter element 30 is discharged out of the oil separation chamber 21. It is configured to be able to.

  As described above, the filter element 30 includes an element body 31 formed in a cylindrical shape, an upper end plate 32 covering the upper end portion of the element body 31, and a lower end plate 33 covering the lower end portion. It is configured.

  Of these, the element body 31 is a filter medium, and is configured to collect oil contained in the gas when passing the compressed gas.

  Since the upper and lower ends of the element body 31 are closed by the end plates 32 and 33 as described above, the compressed gas introduced into the oil separation chamber 21 through the gap between the cover 20 and the filter element 30 is The upper end opening of the lead-out pipe 40 cannot be reached unless it passes through the thickness of the element body 31, and oil contained in the compressed gas can be removed when passing through the element body 31. ing.

  As shown in FIG. 1, the lower end plate 33 covering the lower portion of the element main body 31 includes an edge wall 33a that rises upward at the outer peripheral edge portion, and is separated to the inner peripheral side of the edge wall 33a. An oil reservoir is formed in which the cooled cooling oil is accumulated. When the cooling oil accumulates beyond the edge wall 33b provided on the inner peripheral side of the lower end plate 33, the cooling oil is discharged through the oil discharge port 16 described above. It is like that.

  An outer peripheral portion of the outlet pipe 40 positioned at a high position with respect to the opening position of the oil discharge port 16 (in the illustrated example, the upper end position of the protruding portion 15) is relatively small with respect to the small diameter portion 42. A step portion 41 composed of a large diameter portion 43 is provided.

  In the illustrated embodiment, the upper side with respect to the approximate center position in the length direction (height direction) of the outlet pipe 40 is formed to have a relatively large diameter with respect to the lower side of the small diameter with respect to the center position. Thus, by forming a portion 47 having a step on the outer periphery of the outlet pipe 40, a step portion 41a projecting in an overhang shape is formed at the boundary portion between the large diameter portion 43 and the small diameter portion 42, and the derivation is performed. By forming a groove 45 (small-diameter portion 42 formed of an annular groove) in the vicinity of the upper end of the tube 40, a step portion 41a projecting in an overhang shape at both ends in the width direction (vertical direction on the paper surface) of the groove, and a terrace shape A stepped portion 41b is formed at the same time (see an enlarged view in FIG. 2).

  Here, the overhang-shaped step portion (large-diameter portion) 41a is a step portion formed by an inclination exceeding the vertical when the axis of the lead-out pipe 40 is a vertical line. The step portion is formed by an inclination less than vertical when the axis of the outlet tube 40 is a vertical line.

  The step portion 41 can be formed in various shapes. As described above, the groove 45 is formed (FIGS. 1, 5A and 5B), and the step portion 47 of the outlet tube 40 is formed. 1 (A), 5 (E) and 5 (F)], it is not limited to the case where the step portions 41a and 41b are formed. For example, as shown in FIGS. The step portions 41a and 41b may be formed by forming the flange 46 (large diameter portion 43) on the outer periphery of the step 40, and further, the step portion 41 (the groove 45 and the flange 46 for forming the step portion, (Including the formation of the stepped portion 47) may be provided at a plurality of positions in the height direction of the outlet tube 40. In this case, the formation of the groove 45, the formation of the flange 46, and the configuration for forming the stepped portion 47 are arbitrarily selected. It may be combined with

  In addition, in the step part in this application, as shown in FIGS. 5D and 5E, a step part 41a protruding in an overhang shape is formed alone, or as shown in FIGS. 5A to 5C. In addition, when the groove 45 or the flange 46 is formed, the step portion 41a protruding in an overhang shape and the step portion 41b protruding in a terrace shape are provided in combination, and as shown in FIG. This includes the case where only the step portion 41b including the step portion 47 projecting over is formed.

  5A to 5C may be provided not only at the upper end of the outlet pipe 40 but also at an intermediate position in the height direction, etc. 5E and 5F may be provided near the upper end of the lead-out pipe 40.

  Further, in the embodiment shown in FIG. 1, the stepped portion is provided at a plurality of locations for one outlet pipe 40, but the present invention is not limited to this configuration, and the stepped portion is, for example, as shown in FIG. In addition, only one location may be provided at an intermediate position in the height direction of the outlet tube 40.

  However, when the single step portion 41 is provided in the outlet pipe 40, it is preferable that the step portion 41 is provided in the vicinity of the upper end of the outlet pipe 40. Further, as described above, when the plurality of step portions 41 are provided, it is preferable to provide at least one of them in the vicinity of the upper end of the outlet pipe 40.

  For example, as shown in FIG. 4, when the step portion 41 (41 a) is formed by providing the step portion 47 only at the center position in the length direction of the lead-out tube 40, the lead-out tube 40 is positioned at a position higher than this portion 47. When the cooling oil adheres to the outer periphery, the cooling oil can rise along the outer periphery of the outlet pipe 40 without being restricted by the step portion 41a generated in the stepped portion 47, and an oil droplet on the outlet pipe 40 In some cases, it is not possible to completely prevent the intrusion.

  However, as described above, by forming the step portion 41 near the upper end of the lead-out pipe 40, the rise of the cooling oil adhering to the outer periphery of the lead-out pipe 40 can be prevented by this step portion. Infiltration of oil droplets can be prevented more reliably.

  When the groove (small-diameter portion 42) 45 is formed on the outer periphery of the lead-out pipe 40 in order to form the above-described step portions 41a and 41b, as shown in FIGS. In addition to the case where the annular groove 45 is formed, as shown in FIG. 5B, a plurality of annular grooves 45 may be provided in parallel at predetermined intervals. It is good also as what forms in the outer periphery of the pipe | tube 40 at spiral shape.

  In the case of forming a spiral groove, the upper end of the groove ends at a position lower than the upper edge of the outlet pipe, and the cooling oil rises along the spiral groove so that the outlet pipe rises. Intrusion into 40 is prevented.

  Furthermore, as described above, the step portions 41a and 41b may be provided by forming a flange 46 on the outer periphery of the outlet tube 40 as shown in FIGS. In the illustrated example, the flange 46 is formed in a shape having a circular outer periphery, but the shape of the flange 46 is not limited to the illustrated example. For example, the outer edge of the flange is rectangular, other polygons, It may be formed in a geometric shape or the like. Further, like the groove described above, the flange 46 may be formed in a spiral shape.

  When the step portion 41 is formed by providing the flange 46, as described above, the filter element 30 is replaced with the cover 20, and the cover integrated filter element 30 is used in the configuration of the embodiment shown in FIG. In view of the fact that when the filter element 30 is replaced, the flange 46 may interfere with the mounting hole 22a of the bottom plate 22 and interfere with the replacement work, the structure of the filter element 30 with an integrated cover is adopted. In this case, it is preferable to form the above-described step portions 41 a and 41 b by forming the groove 45.

  However, in the cover and filter separation type configuration as shown in FIG. 3, the above problem does not occur even when the outlet pipe 40 is provided with a flange.

  Here, the cooling oil that adheres to the outer periphery of the outlet pipe 40 and rises on the outer periphery of the outlet pipe 40 to reach the step portions 41a and 41b is a case where the step portion 41a is overhanging. If the compressed gas flow is received by colliding with the stepped portion 41a, it cannot rise, and if the stepped portion 41b protrudes in a terrace shape, the cooling oil riding on the stepped portion 41b is compressed. No further rise occurs due to difficulty in receiving gas flow.

Then, when the cooling oil sequentially reaches the step portions 41a and 41b and grows into large oil droplets that cannot be pushed up by the compressed gas flow generated in the oil separation chamber 21, the step portions 41 (41a and 41b) are formed. The accumulated cooling oil falls along the surface of the outlet pipe 40 and is discharged through the oil discharge port 16 together with other cooling oil.
In this embodiment, as an example, the step δ at the step portion is set to 1.0 mm.

  From the viewpoint of preventing the cooling oil from rising, there is no particular limitation on the amount of the step δ being large. The larger the step δ is, the more the step portion is the overhanging step portion 41a, the cooling oil is at this step. If the stepped portion is a terrace-shaped stepped portion 41b, the cooling oil riding on the stepped portion 41b is not easily affected by the compressed gas flow. ) And (D), when the step portion is formed by providing the flange 46, the step δ can be made relatively large.

  However, when an excessively large step δ is formed, the processing for forming the stepped portion in the outlet pipe 40 is costly and, for example, when the filter element is replaced, the stepped portion (flange portion) interferes with the filter element or the like. There is a possibility that workability may be deteriorated and the flow of compressed gas toward the upper end opening of the outlet pipe 40 may be hindered.

  In the present embodiment, as an example, the angle θ (see the enlarged view in FIG. 2) formed by the step portion 41 with respect to the axis of the outlet tube 40 is set to 90 °.

  In addition, you may form roundness in the corner | angular part C (refer the enlarged view in FIG. 2), and may have roundness. In the present embodiment in which the step portion is formed by providing the groove 45, the groove width is set to 3 mm as an example. If the groove width is too large, the cooling oil collected in the groove 45 is likely to receive a compressed gas flow flowing in the oil separation chamber. On the other hand, if the groove width is too small, the amount of cooling oil that can be collected in the groove is small. The oil droplets cannot grow to a size that is small enough to fall against the compressed gas flow. In this embodiment, as an example, the distance between the upper end of the groove and the upper end of the outlet is 5 mm.

  Note that the step δ, the angle θ formed by the step portion 41 with respect to the axis of the outlet pipe 40, the groove width, and the distance between the upper end of the groove and the upper end of the outlet are not limited to the above-mentioned values, and the cooling oil The viscosity is determined as appropriate according to the viscosity of the gas, the speed of the compressed gas flow, the amount of cooling oil adhering to the outer periphery of the outlet pipe 40, and the like.

  In the present embodiment where the compressed gas from the receiver tank 74 is the object of processing, the introduction path 12 provided in the base 10 of the oil separator 1 configured as described above is used as the receiver tank 74, and the outlet path 13. Is connected to the consuming side, and the oil discharge path is connected to, for example, the oil supply port 72a of the compressor main body 72, and the compressed gas after the primary separation of the cooling oil in the receiver tank 74 is introduced into the oil separator via the introduction path 12. 1, the compressed gas is introduced between the cover 20 and the filter element 30 from the lower end side of the oil separation chamber 21 through the introduction path 12 and the introduction hole 22b.

  The compressed gas introduced into the oil separation chamber 21 passes through the thickness of the filter element 30, and during this passage, the oil contained in the compressed gas is collected and removed by the filter element 30. The collected cooling oil falls along the filter element 30 and accumulates on the lower end plate of the filter element 30.

  The oil discharge port 16 formed between the outer periphery of the outlet pipe 40 and the inner periphery of the opening 15a formed in the protruding portion 15 is compressed at a lower pressure than that in the oil separation chamber 21 through the oil discharge passage 14 described above. Since the cooling oil is communicated with the oil recovery port 72b of the machine main body 72, when the cooling oil is accumulated up to a position exceeding the edge wall 33b formed on the inner peripheral side of the lower end plate 33, the cooling oil is supplied to the oil discharge port 16 and the oil. It is introduced into the compressor main body 72 via the discharge path 14 and discharged from the oil separation chamber 21.

  On the other hand, the compressed gas from which oil has been removed when passing through the filter element 30 is introduced into the outlet pipe 40 from the upper end of the outlet pipe 40 opened in the filter element 30 and communicates with the lower end of the outlet pipe 40. It is supplied to the consumer side through the outlet path 13.

  Due to the flow of such compressed gas, the oil separator chamber 21 of the oil separator 1 has an arrow in the same figure as in the case of the conventional oil separator 100 described with reference to FIG. When a compressed gas flow toward the upper end of the outlet pipe 40 is generated and cooling oil adheres to the outer periphery of the outlet pipe 40, the cooling oil is pushed up by the compressed gas flow and rises along the outer periphery of the outlet pipe 40. try to.

  However, as described above, the step 41 (41a, 41b) is provided on the outer periphery of the lead-out pipe 40, so that the rise of the cooling oil is prevented by the step 41 (41a, 41b). The cooling oil rising along the outer periphery of the pipe 40 is sequentially collected and collected in the step portions 41 (41a, 41b).

  And if the cooling oil collected by the step part 41 (41a, 41b) grows into a large oil drop exceeding the amount which can be held in the step part 41 (41a, 41b), this cooling oil will be sent to the outlet pipe 40. Along the surface or directly from the outer peripheral edge of the step portion 41 or the like, it falls to the bottom of the oil separation chamber 21 and is collected on the lower end plate 33 of the filter element 30, and together with other cooling oil, the oil discharge port 16. , It is discharged out of the oil separator 1 through the oil discharge path 14.

  Thus, in the oil separator 1 of the present invention, the cooling oil is transmitted along the outer periphery of the outlet pipe 40 by a relatively simple configuration in which the step portion 41 (41a, 41b) is provided on the outer periphery of the outlet pipe 40. Can be prevented from being mixed into the compressed gas supplied to the consumer side, improving the oil separation performance of the oil separator and supplying a cleaner compressed gas from which oil has been removed to the consumer side I was able to.

  In the present embodiment described above, when the oil separator 1 of the present invention is subjected to compressed gas after the cooling oil is primarily separated by the receiver tank 74 of the oil-cooled compressor 70, However, the use of the oil separator 1 of the present invention is not limited to this, and can be provided in various flow path systems for separating and removing the oil from the gas containing the oil.

DESCRIPTION OF SYMBOLS 1 Oil separator 10 Base 12 Introductory path 13 Outlet path 14 Oil discharge path 15 Protruding part 15a Opening d Large diameter part (of opening 15a)
s Small diameter part (of opening 15a)
16 Oil discharge port 20 Cover 21 Oil separation chamber 22 Bottom plate 22a Mounting hole 22b Compressed gas introduction hole 30 Filter element 31 Element main body 32 Upper end plate 33 Lower end plate 33a Edge wall (outer peripheral side)
33b Edge wall (inner side)
40 Lead pipe 41 Step 41a Step (Large diameter portion 43 of lead pipe 40: overhang)
41b Stepped portion (small diameter portion 42 of outlet pipe 40: terrace shape)
42 Small-diameter portion 43 Large-diameter portion 45 Groove (small-diameter portion 42 of outlet pipe 40)
46 Flange (large diameter portion 43 of outlet pipe 40)
47 Step portion (comprising the small diameter portion 42 and the large diameter portion 43 of the outlet pipe 40) 50 Check valve / pressure regulating valve 70 Oil-cooled compressor 72 Compressor body 72a Oil supply port 72b Oil recovery port 73 Drive source (motor)
74 Receiver tank 74a Air outlet 75 Separation oil recovery piping 79 Oil cooler δ Step difference
C Corner portion θ Angle formed by the axis of the outlet pipe and the step portion 100 Oil separator 110 Base 112 Inlet path 113 Outlet path 114 Oil outlet path 116 Oil outlet 120 Cover 121 Oil separation chamber 130 Filter element 132 Upper lid 140 Outlet pipe 160 Cover presser

Claims (6)

In an oil separator for treating and removing a gas containing oil, and separating and removing the oil from the gas,
A base having an introduction path for introducing a gas to be treated, a lead-out path for deriving the gas after the removal of oil, and an oil discharge path for discharging the separated oil are provided,
A cylindrical cover whose upper end is closed is mounted on the base, an oil separation chamber is formed inside the cover, an annular filter element is opened in the oil separation chamber, and an upper end is opened in the filter element In addition to arranging the outlet pipe,
The introduction path communicates with the oil separation chamber between the cover and the filter element, and the lead-out path communicates with the lower end of the outlet pipe and opens in the space inside the filter element on the lower end side of the filter element. The oil discharge passage is connected to the oil discharge port,
Further, from the outer periphery of the outlet pipe, above the position where the oil discharge port is formed, from the small diameter portion formed on the outer periphery of the outlet pipe and the large diameter portion relatively larger than the small diameter portion. An oil separator comprising a step portion.   The oil separator according to claim 1, wherein the stepped portion is a stepped portion that protrudes in an overhang shape toward the outer peripheral side of the outlet pipe.   The oil separator according to claim 1 or 2, wherein the stepped portion is provided by forming a groove on an outer periphery of the outlet pipe.   The oil separator according to claim 1 or 2, wherein the stepped portion is provided by forming a flange on an outer periphery of the outlet pipe.   The oil separator according to any one of claims 1 to 4, wherein the step portion is provided in the vicinity of an upper end of the outlet pipe.   The oil separator according to any one of claims 1 to 5, wherein a plurality of the stepped portions are provided in a height direction of the outlet pipe.

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