JP6292847B2 - Oil separator of oil-cooled compressor - Google Patents

Description

  The present invention relates to an oil separator for an oil-cooled compressor, and is provided in an oil-cooled compressor for separating and recovering cooling oil from compressed gas discharged from a compressor body as a gas-liquid mixed fluid with cooling oil. Related to the oil separator.

  In an oil-cooled compressor, the compression action is performed while injecting oil (referred to as “cooling oil” in this specification) for the purpose of cooling, lubrication, and sealing in a gas such as air or gas sucked into the compressor body. As a result, the compressed gas discharged from the compressor body contains a large amount of cooling oil.

  Therefore, the oil-cooled compressor cannot supply the compressed gas discharged from the compressor body to the consumer side as it is, and removes the cooling oil from the compressed gas discharged from the compressor body before supplying it to the consumer side. Work is required.

  Therefore, in an oil-cooled compressor, the compressed gas discharged as a gas-liquid mixed fluid with cooling oil from the discharge port of the compressor body is once introduced into the oil separator, and in this oil separator, the compressed gas and A configuration that separates from cooling oil and supplies compressed gas with separated oil to the consumption side is adopted.

  The oil separator 100 that separates the cooling oil from the compressed gas as described above includes, as an example, a receiver tank 120 that is a pressure vessel and a separator 130 that is accommodated in the receiver tank 120 as shown in FIG. An inlet 111 for introducing compressed gas discharged as a gas-liquid mixed fluid with cooling oil from the discharge port of the compressor body into the receiver tank 120, and the compressed gas after separating the oil is discharged out of the oil separator. And an exhaust port 112 for reintroducing the cooling oil collected in the receiver tank 120 into the oil supply port of the compressor main body, and the exhaust port 141 at the lower portion inside the receiver tank 120. Is covered with a cylindrical separator 130 covered with a bottom plate 135.

  With the above configuration, when compressed gas discharged as a gas-liquid mixed fluid with cooling oil is introduced into the receiver tank 120 through the inlet 111, the cooling oil falls to the bottom of the receiver tank 120 to be separated and recovered. The cooling oil that is separated and contained in the mist state in the compressed gas that could not be removed by the primary separation passes through the separator 130 before being discharged to the outside of the oil separator through the exhaust port 141, and is secondary. To be separated. The compressed gas after the cooling oil is separated in this way is supplied to the consuming side, and the cooling oil recovered in the receiver tank 120 is discharged by using the pressure in the receiver tank 120 or the like. The oil is supplied to the oil supply port of the compressor body through an oil supply pipe (not shown) communicating with the oil port 112.

  In this way, in the oil-cooled compressor, the cooling oil is agitated and compressed together with the gas in the compressor body. However, since the cooling oil is an insulator, static electricity is generated by friction when the oil is agitated and compressed. Occur.

  For this reason, the cooling oil contained in the mist state in the compressed gas is charged by the generated static electricity, and as the separator collects the mist of the charged cooling oil, the static electricity is accumulated in the separator.

  In addition, since the separator element (filter medium) provided in the separator is generally insulative, the separator element as an insulator is charged by friction when high-pressure compressed gas passes through the separator element at high speed.

  In this way, static electricity is stored in the separator and the charging potential becomes high, and when the potential difference between the separator and the receiver tank, which is a conductive part arranged in the vicinity of the separator, exceeds a predetermined value, spark (spark discharge) Is likely to occur.

  If a spark discharge occurs, the separator element that constitutes the separator and the support such as a cylindrical wire mesh or punching metal provided to support the separator element are burned out, and the life of the separator is shortened. There is a risk of fire or explosion if ignited by the cooling oil contained in the mist in the compressed gas.

  In addition, the occurrence of small-scale spark discharges that do not cause a fire or explosion can oxidize mist-like cooling oil and mix the oxidized cooling oil with other cooling oils, thereby shortening the overall life of the cooling oil. It becomes.

  In order to prevent the cooling oil contained in the compressed gas from being in a mist state from being adversely affected by the generation of static electricity, in Patent Document 1 described later, the cooling oil is classified as having an electrostatic dissipative property. It has been proposed to prevent static electricity from accumulating in the cooling oil by treating it with a compound (additive). Specifically, an additive is added directly to the cooling oil of an oil-cooled compressor, or the manufacturing stage. The cooling oil is added to the cooling oil collected in the separator element by coating or impregnating the separator element with the cooling oil previously added with the additive. It has been proposed to impart static dissipating properties.

Special Table 2002-506945

  According to the method described in Patent Document 1 described above, the occurrence of spark discharge due to charging can be eliminated by imparting static electricity dissipation to the cooling oil.

  However, when trying to prevent the occurrence of spark discharge by the method described in Patent Document 1, the following problems still remain.

(1) Performance degradation with time In the method described in Patent Document 1, since the additive added to the cooling oil is consumed with the operation of the compressor, the electrostatic dissipation function declines with time.

  That is, in order to dissipate the static electricity of the cooling oil by adding the additive (antistatic), an amount of the additive that forms the cooling oil with a predetermined conductivity (see claims 2, 3 and 4 of Patent Document 1) is required. However, in oil-cooled compressors, the oil content in the compressed gas cannot be completely removed even after the primary and secondary separations by the oil separator. However, since the cooling oil is slightly taken out with the compressed gas, the cooling oil in the apparatus gradually decreases.

  Therefore, it is necessary to supplement the cooling oil that has been reduced by the compressor operation. At this time, when adding coolant that has not been added with additives, or by adding coolant only to add coolant. Otherwise, the additive concentration in the cooling oil will be low and the specified static dissipation performance will not be achieved. Then, static electricity is accumulated in the separator and the charging potential becomes high. When the potential difference between the separator and the receiver tank, which is a conductive part arranged in the vicinity of the separator, exceeds a predetermined value, the risk of occurrence of spark discharge increases. .

  In addition, even in a configuration in which the additive applied or impregnated on the separator element is leached into the collected cooling oil, if the additive applied or impregnated on the separator element is completely discharged, the electrostatic dissipation performance is lost. Then, if the compressor continues to operate, static electricity is accumulated in the separator and the charging potential becomes high, and if the potential difference between the separator and the receiver tank, which is a conductive component arranged in the vicinity of the separator, exceeds a predetermined value The risk of occurrence of spark discharge will increase.

(2) Difficulties in grasping that the dissipative effect is obtained As described above, even if the content of the additive is reduced and the static dissipative property of the cooling oil is lost, In the configuration, this cannot be easily confirmed from the outside by visual inspection or the like. In the configuration in which the additive is added directly to the cooling oil, whether or not the content of the additive contained in the cooling oil is appropriate. This must be confirmed by complicated work such as measuring the conductivity of the cooling oil.

  In addition, even in a configuration in which an additive is applied to or impregnated into the separator element, the remaining amount of the additive cannot be confirmed simply by visually checking the separator element. It is necessary to replace the separator with a certain margin before the additive is completely removed, and even if the separator is still usable, it is necessary to replace or discard it. Take it.

  Therefore, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and it is possible to permanently obtain the antistatic effect of the separator and to perform complicated operations such as measuring the conductivity of the cooling oil. It is an object of the present invention to provide an oil separator for an oil-cooled compressor, which can easily confirm whether or not the separator is in a state where the antistatic effect of the separator can be obtained from the outside.

  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, the oil separator 10 of the oil-cooled compressor 1 of the present invention includes:
A receiver tank 20 that opens an inlet 11 for introducing compressed gas discharged together with cooling oil from the compressor body 2 and an upper opening 23 of the receiver tank 20 are covered, and the compressed gas is discharged. A cover plate 40 in which an exhaust port 41 is formed, and a cylindrical separator 30 which covers the exhaust port 41 formed in the cover plate 40 inside the receiver tank 20 and whose bottom is closed by a bottom plate 35 are provided. In the oil separator 10 of the oil-cooled compressor 1,
Conductive parts provided in the separator 30 [support 31 (inner cylinder 31a, outer cylinder 31b), bottom plate 35] and electrically connected to the outer periphery of the separator 30 from the upper edge thereof. The locking flange 36 is provided,
The separator 30 is inserted into the upper opening 23 of the receiver tank 20 so that the locking flange 36 is locked on the periphery of the upper opening 23 of the receiver tank 20 via a sealing material such as a gasket 61. The lid plate 40 is placed on the locking flange 36 via a sealing material such as a gasket 62, and the lid plate 40 is fixed to the upper end surface of the receiver tank 20 to fix the upper portion of the receiver tank 20. While covering the opening 23,
Of the locking flange 36, a portion protruding in the outer peripheral direction from the outer peripheral edge of the lid plate 40 is used as a connection portion, and the connection portion is formed integrally with the locking flange 36, and the compressor. Of the components constituting the circuit board, it is electrically connected to a conductive component other than the separator 30 (claim 1).

  A conductive projecting piece 38 is provided on the outer peripheral edge of the locking flange 36 and protrudes in the outer peripheral direction from the outer peripheral edge of the cover plate 40. Conductive elements other than the separator 30 are provided with the projecting piece 38 as the connecting portion. It is electrically connected to the sexual component (claim 2).

  For electrical connection with conductive parts other than the separator 30, for example, a conductive antistatic cable 71 having one end connected to the projecting piece 38 which is the connecting portion is provided, and the other end of the antistatic cable 71 is connected to the other end. For example, it may be performed by connecting to the receiver tank 20 or other conductive parts, connecting to the negative terminal of the battery, or connecting to the ground wire of the wire harness.

  Alternatively, in the configuration in which the protruding piece 38 is provided as the connecting portion, when the separator 30 and the cover plate 40 are attached to the receiver tank 20, at least the distal end portion of the protruding piece 38 is not in the receiver tank 20. The protruding piece 38 may be electrically connected to the receiver tank 20 which is a conductive component other than the separator 30 by bending the protruding piece 38 downward so as to be pressed against the upper end surface. Good (claim 4).

  In this case, a through hole 38a or a notch 38b is formed at the tip of the protruding piece 38 at a position in contact with the upper end surface of the receiver tank 20, and the receiver tank 20 is provided via the through hole 38a or the notch 38b. The protruding piece 38 may be pressed against the upper end surface of the receiver tank 20 with a bolt 52 screwed into the bolt hole 25 formed on the upper end surface of the receiver tank 20 (claim 5).

  Further, in the configuration in which, for example, the protruding piece 38 which is the connecting portion described above and the conductive parts other than the separator 30 are electrically connected via the antistatic cable 71, the protruding piece 38 is provided. An alarm means 80 for indicating that the state of being electrically connected to conductive parts other than the separator 30 has been released may be provided in connection with the antistatic cable 71 (Claim 6).

  With the configuration of the present invention described above, the following significant effects can be obtained in the oil separator 10 of the oil-cooled compressor 1 of the present invention.

  The locking flange 36 that is electrically connected to the conductive parts of the separator 30 is connected to the compressor via a connecting portion, for example, a protruding piece 38, which protrudes in the outer peripheral direction from the outer peripheral edge of the lid plate 40. Among the components to be configured, by being electrically connected to a conductive component other than the separator 30, static electricity stored in the separator 30 can be released to the conductive component via the locking flange 36. The potential difference could be reduced to such an extent that the potential difference between 30 and the conductive part was eliminated or spark discharge was not generated. Further, while the connection portion of the locking flange 36 is in a state of being electrically connected to the conductive component different from the separator 30, it is possible to prevent an increase in the charging potential in the separator 30 and to prevent the cooling oil Unlike the case of preventing the increase of the charging potential by adding an additive to the separator element or by applying or impregnating the separator element with the additive, the oil separation does not lose the effect of preventing the increase of the charging potential over time. I was able to get a bowl.

  As a result, it was possible to suitably prevent an increase in the charging potential of the separator 30 even when the coolant was not replenished or added at the time of replacement, or the periodic separator replacement was not performed. .

  In addition, the electrical connection between the separator 30 and the conductive parts other than the separator 30 described above is performed via a connection portion that is a portion protruding in the outer peripheral direction with respect to the cover plate 40, for example, a protruding piece 38. Thus, whether or not the separator 30 is in a state in which an increase in the charging potential can be prevented is determined from the outside of the oil separator 10 by connecting the connecting portion such as the projecting piece 38 to the conductive part different from the separator 30. It was possible to easily confirm whether or not it was done simply by visual inspection or touching by hand.

  In particular, in the configuration in which the connecting portion such as the protruding piece 38 is connected to the conductive parts other than the separator 30 via the antistatic cable 71, the connection state of the antistatic cable 71 is inspected visually or by hand. Further, in the configuration in which the connecting portion is a protruding piece 38 and the tip of the protruding piece 38 is directly pressed against the upper end surface of the receiver tank 20, the protruding piece 38 and By simply checking the contact state between the upper end surfaces of the receiver tank 20, the above-described confirmation operation could be easily performed.

  In addition, an alarm means 80 is provided to indicate that the electrical connection state between the connecting portion such as the protruding piece 38 and the conductive parts other than the separator 30 has been released by outputting a warning sound or lighting a warning light. In the configuration, when static electricity is accumulated in the separator 30 and the potential difference between the separator 30 and the conductive parts other than the separator 30 increases and there is a risk of spark discharge, this can be surely grasped. Even if a compressor is installed in a separate room in a factory facility, etc., and the operation is controlled by a separate cab or operation panel, a warning light, etc. must be provided in the cab or control panel. The loss of the antistatic function of the separator could be detected from a remote location without opening the inspection door provided in the soundproof box of the compressor in which the oil separator 10 was accommodated.

Explanatory drawing which shows the whole structure of an oil-cooled compressor. (A) of the oil separator of this invention is a top view, (B) is the BB sectional drawing of (A). The elements on larger scale of FIG. (A) of another oil separator of this invention is a top view, (B) is the BB sectional drawing of (A). The elements on larger scale of FIG. 4 (B). It is explanatory drawing of the separator used for the oil separator of this invention, (A) is a top view, (B) is front sectional drawing. The elements on larger scale of the oil separator of this invention provided with the alarm means. Explanatory drawing which showed the structural example of the oil separator (conventional).

  The oil separator of the oil-cooled compressor according to the present invention will be described below with reference to the accompanying drawings.

[Oil-cooled compressor]
As shown in FIG. 1, an oil-cooled compressor 1 provided with an oil separator 10 according to the present invention includes a compressor body 2 that compresses a gas to be compressed together with cooling oil, and discharges the cooling body from the compressor body 2 together with cooling oil. An oil separator 10 is provided for introducing the compressed gas and separating the cooling oil from the introduced compressed gas. The cooling oil separated and recovered by the oil separator 10 is supplied to the oil supply port 2a of the compressor body. An oil supply passage 3 to be reintroduced into the oil supply passage 3 is formed. The recovered oil is cooled and filtered by an oil cooler 4 and an oil filter 5 provided in the oil supply passage 3, and then the compressor body 2 It is comprised so that it can supply to.

  Then, the compressed gas after the cooling oil is removed by the oil separator 10 is introduced into an air working machine or the like provided on the compressed gas consumption side and used for the operation of these devices.

(Oil separator)
(1) Overall Configuration of Oil Separator As described above, the oil separator 10 that separates and recovers cooling oil from the compressed gas discharged from the compressor body 2 is configured as shown in FIGS. ), A receiver tank 20 that is a pressure vessel, a lid plate 40 that covers the upper opening 23 of the receiver tank 20, and an exhaust port 41 formed in the lid plate 40 inside the receiver tank 20 are provided. The cylindrical separator 30 is covered and covered with the bottom plate 35 at the bottom.

(2) Receiver tank The receiver tank 20 is a pressure vessel that internally forms a storage space for the introduced compressed gas and cooling oil. In the embodiment shown in FIG. It is formed in a bottomed cylindrical shape with the top and bottom direction opened upward.

  An inlet 11 (see FIG. 1) for introducing the compressed gas discharged from the compressor body 2 is formed at a position near the upper portion of the side wall of the receiver tank 20.

  Preferably, the inlet 11 is opened at a position where the introduced compressed gas can be swung along the inner surface of the side wall of the receiver tank 20.

  As a result, the cooling oil introduced into the receiver tank 20 together with the compressed gas is not only collected by dropping directly to the bottom of the receiver tank 20 due to gravity, but also centrifuged when the compressed gas swirls in the receiver tank 20. Separation (primary separation) can be performed more effectively by causing the cooling oil in the compressed gas to collide with the inner wall of the receiver tank 20 by force and dropping along the inner wall.

  In the illustrated embodiment, in order to easily generate a swirling flow along the inner wall of the receiver tank 20 in the compressed gas introduced into the receiver tank 20, the upper part in the receiver tank 20 is parallel to the inner wall. The guide plate 21 is provided in a range of less than one round, for example, in the range of 180 ° to 270 °, and a guide channel 22 for guiding the flow of the introduced compressed gas is formed between the inner wall of the receiver tank 20 and the guide plate 21. Yes.

  An upper end surface for attaching a cover plate 40 to be described later is provided at the upper end of the receiver tank 20 thus configured, and an upper opening 23 into which a separator 30 to be described later is inserted at the center of the upper end surface. Is provided.

  And the bolt hole 24 for attaching the cover board 40 mentioned later is formed in the above-mentioned upper end surface in the outer peripheral position of the upper opening 23. FIG.

(3) Separator The separator 30 is inserted into the receiver tank 20 configured as described above through the upper opening 23 of the receiver tank.

  As shown in FIGS. 6 (A) and 6 (B), the separator 30 includes a support 31 formed by concentrically arranging an inner cylinder 31a and an outer cylinder 31b formed of a metal mesh or punching metal, Separator element 32 composed of wool, other fibers, filter paper, etc. accommodated and supported between inner cylinder 31a and outer cylinder 31b of support 31, and bottom plate 35 covering the bottom of support 31 Provided, and is formed in a bottomed cylindrical shape whose bottom is closed by the bottom plate 35.

  In the separator 30 used in the oil separator 10 of the present invention, the separator 30 protrudes in the outer peripheral direction from the upper edge of the separator 30 so as to be accommodated in the upper opening 23 of the receiver tank 20 in a suspended state. When the locking flange 36 is attached and the separator 30 is inserted into the upper opening 23 of the receiver tank 20 from the bottom side closed by the bottom plate 35, the locking flange 36 is inserted into the peripheral edge of the upper opening 23 of the receiver tank 20. The separator 30 is placed so as to be concentric with the inner periphery of the side wall of the receiver tank 20.

  The aforementioned locking flange 36 is made of a conductive material, and is attached in an electrically connected state to a conductive support 31 made of a wire mesh or punching metal.

  As an example of an attachment method enabling such electrical connection, as shown in an enlarged view in FIG. 6B, welding 37a is performed at a predetermined interval in the circumferential direction, so The locking flange 36 may be directly welded to the upper end edges of the cylinder 31a and the outer cylinder 31b to ensure electrical connection. Although illustration is omitted, the inner cylinder 31a and the outer cylinder 31b of the support 31 are not shown. By similarly welding the conductive bottom plate 35 to the lower end edge, the conductive parts provided in the separator 30 can be electrically connected.

  Further, the attachment of the locking flange 36 to the support 31 is performed between the upper end of the support 31 and the locking flange 36 as shown as another example in the enlarged view in FIG. An adhesive is provided between the upper end of the support 31 and the locking flange 36 in a state where the metal sheet 37b is sandwiched to ensure electrical connection and the metal sheet 37b is in contact with the support 31 and the locking flange 36. It is good also as what adhere | attaches by 37c, It is good also as what adhere | attaches between the lower end edge of the support body 31 and the baseplate 35 by the same method.

  As described above, even when the locking flange 36 and the bottom plate 35 are bonded to the support 31 with an adhesive, if the adhesive itself has conductivity, the metal described above is used. The intervention of the sheet 37b may be omitted.

  In addition, the joining between the conductive parts constituting the separator 30 is not limited to the above-described method as long as electrical connection between the parts is possible, and the joining or bonding is performed by any other method. It may be a thing.

  As described above, the locking flange 36 attached to the upper end of the support 31 has an outer diameter larger than that of the upper opening 23 of the receiver tank 20 and smaller than an outer diameter of the lid plate 40 described later. Forming.

Then, the locking flange 36, the projecting piece 38 further electrically conductive projecting from the outer circumferential direction from the outer peripheral edge thereof, the locking flange 36 integrally formed with the projecting portions 38, It is provided as a connecting portion for electrically connecting to a conductive part different from the separator 30 among the parts constituting the compressor.

  The protruding piece 38 is formed to have a length that protrudes further in the outer circumferential direction from the outer peripheral edge of the lid plate 40 when the upper opening 23 of the receiver tank 20 is covered with the lid plate 40 described later.

  In the illustrated embodiment, the outer diameter of the locking flange 36 is smaller than the outer diameter of the lid plate 40, and the outer peripheral edge of the locking flange 36 is disposed inside the outer peripheral edge of the lid plate 40. And a protruding piece 38 protruding outward from the outer peripheral edge of the locking flange 36, and the above-mentioned “connection” protruding in the outer peripheral direction of the lid plate 40 by the protruding piece 38. However, the structure of the “connection portion” may be any structure as long as it is formed as a portion protruding from the outer peripheral edge of the cover plate 40 in the outer peripheral edge of the locking flange 36. For example, the outer diameter of the locking flange 36 is formed to be larger than the outer diameter of the cover plate 40 and protrudes in the outer peripheral direction from the cover plate 40. The above-mentioned connection part that is electrically connected to the conductive parts of It is good, in this case, may not be separately provided with the projecting portions 38.

(4) Lid Plate The upper opening 23 of the receiver tank 20 described above is covered with the lid plate 40 after the separator 30 is attached.

  As shown in FIG. 2 (A), the lid plate 40 is formed with a larger diameter than the locking flange 36 attached to the separator 30 and discharges the compressed gas in the receiver tank 20 to the central portion thereof. An exhaust port 41 is formed, and holes 42 for fastening bolts are formed at predetermined intervals in the circumferential direction. The tip of the bolt 51 inserted through the hole 42 is connected to the receiver tank. The lid plate 40 can be attached to the upper end surface of the receiver tank 20 by being screwed into a bolt hole 24 formed in the upper end surface of the receiver 20.

  In the embodiment shown in FIGS. 2 (A) and 2 (B), when the cover plate 40 is placed on the locking flange 36 attached to the separator 30, an opening for inserting a bolt in a plan view is provided. 42 is provided at a position circumscribing the outer peripheral edge of the locking flange 36, and when the cover plate 40 is bolted to the upper end surface of the receiver tank 20, the locking flange 36 is a fixing bolt 51. It is configured to fit inside the enclosed part.

(5) Assembly of oil separator The above-described receiver tank 20, separator 30, and lid plate 40 constituting the oil separator 10 are attached to the endless annular gasket 61 on the periphery of the upper opening 23 of the receiver tank 20 first. In this state, the separator 30 is inserted into the upper opening 23 of the receiver tank 20 from the bottom side, and the locking flange 36 is placed on the gasket 61 described above.

  Thereafter, an endless annular gasket 62 is similarly placed on the upper surface of the locking flange 36, and the upper opening 23 of the receiver tank 20 is covered so that the bottom surface of the cover plate 40 is placed on the gasket 62. Cover.

  The inner diameters of the gaskets 61 and 62 used here are slightly larger than the inner diameter of the locking flange 36, and the outer diameter is preferably the same as the outer diameter of the locking flange 36. The width is not particularly limited as long as it can be formed, and various widths can be formed.

  When the outer diameters of the gaskets 61 and 62 are larger than the outer diameter of the locking flange, the protruding piece 38 described above has the same thickness as the locking flange 36 or is larger than the locking flange 36. Form thinly.

  In this way, with the gaskets 61 and 62 interposed, the locking flange 36 is sandwiched between the upper end surface of the receiver tank 20 and the bottom surface of the cover plate 40, and bolts are provided in the openings 42 provided in the cover plate 40. The separator 30 and the cover plate 40 are attached to the receiver tank 20 by inserting 51 and screwing the tip of the bolt 51 into the bolt hole 24 formed in the upper end surface of the receiver tank 20.

(6) Electrical connection between the separator and other conductive parts In this manner, when the separator 30 and the cover plate 40 are attached to the receiver tank 20, the protrusions project outward from the locking flange 36 attached to the separator 30. The provided protruding piece 38 protrudes further in the outer peripheral direction from the lower part of the cover plate 40 and is arranged in a state that can be visually confirmed from the outside.

  In the oil separator 10 of the present invention, the protruding piece 38 is electrically connected to a conductive part other than the separator 30, and thus the conductive part provided on the separator 30 is electrically connected to other conductive parts. As a result, the charging potential in the separator 30 is prevented from increasing.

  In order to electrically connect the protruding piece 38 to a conductive part other than the separator 30, in the example shown in FIGS. 2 and 3, one end of the antistatic cable 71 is soldered and caulked to the protruding piece 38, for example. The antistatic cable 71 is connected by a method such as bolting, and the other end of the antistatic cable 71 is connected to a conductive part other than the separator 30.

  In the example shown in FIGS. 2 and 3, a ring terminal is attached to the other end of the antistatic cable 71, and a bolt 24 for fixing the cover plate 40 is inserted into the opening of the ring terminal to By fastening together, the receiver tank 20, the cover plate 40, and the separator 30 are electrically connected, and the potential difference is eliminated.

  However, the other end of the antistatic cable 71 having one end connected to the projecting piece 38 may be connected to a negative terminal of a battery provided in the oil-cooled compressor, a ground wire of a wire harness, or the like.

  In the example shown in FIGS. 4 and 5, the protruding piece 38 protrudes outward from the gaskets 61 and 62 instead of the electrical connection to the conductive parts other than the separator 30 by the antistatic cable 71 described above. When the cover plate 40 is bent downward and the locking flange 36 of the separator 30 is pressed toward the upper end surface of the receiver tank 20 by the attachment of the cover plate 40, the protruding piece 38 is shaped like a leaf spring and its tip is pushed to the receiver tank 20 The projecting piece 38 may be electrically connected to the receiver tank 20 which is a conductive part.

  Preferably, as shown in FIG. 4A, a through hole 38a or a notch 38b is provided at the tip of the projecting piece 38 configured as described above, and the through hole 38a is inserted through the through hole 38a or the notch 38b. Alternatively, a bolt 52 is screwed into a bolt hole 25 provided in the upper end surface of the receiver tank 20 at a position below the notch 38 b, so that the tip of the projecting piece 38 is brought into contact with the upper end surface of the receiver tank 20 by tightening the bolt 52. You may enable it to maintain the pressed state reliably.

  As described above, in the example in which the protruding piece 38 is electrically connected to the conductive parts other than the separator 30 via the antistatic cable 71, the antistatic cable 71 is charged with the charging as shown in FIG. Alarm means for notifying the occurrence of a warning sound or lighting of a warning lamp when the electrical connection state to the conductive parts other than the protruding piece 38 and the separator 30 is cut off due to the disconnection or disconnection of the prevention cable 71 80 may be provided.

(7) Operation, etc. When the compressed gas mixed with the cooling oil discharged from the compressor body 2 and gas-liquid is introduced into the oil separator 10 configured as described above, the compressed gas is introduced into the receiver tank 20 together with the compressed gas. In this embodiment, the cooling oil is collected by dropping to the bottom of the receiver tank 20 by gravity and collecting the compressed gas in the receiver tank 20 in this embodiment. The cooling oil that has collided with the inner wall of the receiver tank 20 due to the centrifugal force generated by the above is recovered by dropping along the inner wall of the receiver tank 20 and collecting at the bottom of the receiver tank 20, and thus primary separation of the cooling oil. Is completed.

  The compressed gas that has undergone the primary separation of the cooling oil is then introduced into the space in the separator 30 through the outer cylinder 31b, the separator element 32, and the inner cylinder 31a of the separator 30, and passes through the separator element 32. The secondary separation is completed by collecting the cooling oil that was present in the mist state in the compressed gas, and the compressed gas after the secondary separation of the cooling oil is completed in this way It is discharged out of the oil separator 10 through an exhaust port 41 formed in the center of 40 and supplied to the consumption side.

  The separator 30 may be charged with static electricity by collecting the mist of the cooling oil charged in the separator element 32 provided in the separator 30 or by friction when high-pressure compressed gas passes through the separator element 32 at high speed. The support 31 and the bottom plate 35, which are conductive parts provided on the separator 30, are electrically connected to the locking flange 36, and the protruding piece 38 provided on the locking flange 36 is replaced with a compressor. Among these components, the electric charges are electrically connected to the conductive components other than the separator 30, so that these charges are passed through the support 31 provided on the separator 30, the locking flange 36, and the protruding piece 38. , Which can be released to conductive parts other than the separator 30 and is a conductive part disposed in the vicinity of the separator 30 and the separator 30. No potential difference occurs in the degree difference is eliminated or spark discharge of the tank 20 and the lid plate 40 are generated.

  As a result, in the oil-cooled compressor 1 equipped with the oil separator 10 of the present invention, not only the life of the separator 30 is prevented from being shortened due to burning caused by the occurrence of spark discharge, but also the compressed gas is in a mist state. The risk of igniting the included cooling oil can also be reduced.

  Further, since it was possible to prevent the spark discharge from occurring in the separator 30, it was possible to prevent the cooling oil from being oxidized due to the spark discharge, to prevent the performance of the cooling oil from being lowered, and to extend the life of the cooling oil.

  Further, whether or not the separator 30 is in a state in which a rise in the charging potential can be prevented is determined by connecting the protruding piece 38 to the conductive component from the outside of the oil separator 10 via the antistatic cable 71. In such a case, the connection state of the antistatic cable 71 can be inspected only by visual or manual inspection, and in the configuration in which the tip of the protruding piece 38 is directly pressed against the upper end surface of the receiver tank 20, It was easy to perform by simply checking the contact state between the piece 38 and the upper end surface of the receiver tank 20.

In the case of providing a warning means 80 for displaying a warning sound or turning on a warning light, the compressor is installed in a separate room, etc., and the operation is controlled by a separate cab or operation control panel, etc. However, by providing warning lights or the like in the cab or control panel, the inspection door provided in the soundproof box of the compressor in which the oil separator 10 is accommodated can be opened from a remote location. I was able to grasp.

DESCRIPTION OF SYMBOLS 1 Oil-cooled compressor 2 Compressor main body 2a Oil supply port 3 Oil supply flow path 4 Oil cooler 5 Oil filter 10 Oil separator 11 Introduction port 12 Oil discharge port 20 Receiver tank 21 Guide plate 22 Guide flow channel 23 Upper opening 24 Bolt hole (For lid plate fixing)
25 Bolt hole (for fixing the protruding piece)
30 Separator 31 Support 31a Inner cylinder 31b Outer cylinder 32 Separator element 35 Bottom plate 36 Locking flange 37a Welding 37b Metal sheet 37c Adhesive 38 Protruding piece 38a Through hole 38b Notch 40 Lid plate 41 Exhaust port 42 Open hole 51 Bolt ( (For lid plate fixing)
52 bolts (for fixing projecting pieces)
61, 62 Gasket 71 Antistatic cable 80 Alarm means 100 Oil separator 111 Inlet port 112 Oil outlet port 120 Receiver tank 130 Separator 135 Bottom plate 141 Exhaust port

Claims (6)

A receiver tank that opens an inlet for introducing compressed gas discharged together with cooling oil from the compressor body, and an exhaust port that covers the upper opening of the receiver tank and discharges compressed gas are formed. An oil separator for an oil-cooled compressor comprising a cover plate and a cylindrical separator that covers an exhaust port formed in the cover plate inside the receiver tank and whose bottom is closed by a bottom plate,
Provided with a conductive locking flange that is electrically connected to the conductive component provided in the separator and protrudes in the outer peripheral direction from the upper edge of the separator;
The separator is inserted into the upper opening of the receiver tank so that the locking flange is locked on the periphery of the upper opening of the receiver tank via a sealing material, and the sealing material is placed on the locking flange. The lid plate is placed via the lid, the lid plate is fixed to the upper end surface of the receiver tank, and the upper opening of the receiver tank is covered,
Of the locking flange, a portion protruding in the outer peripheral direction from the outer peripheral edge of the lid plate is used as a connection portion, and the connection portion is formed integrally with the locking flange and constitutes a compressor. An oil separator for an oil-cooled compressor, wherein the oil separator is electrically connected to a conductive part other than the separator.   A conductive projecting piece projecting in the outer peripheral direction from the outer peripheral edge of the lid plate is provided on the outer peripheral edge of the locking flange, and the projecting piece serves as an electrical connection with conductive parts other than the separator. The oil separator of the oil-cooled compressor according to claim 1, wherein the oil separator is connected in a mechanical manner.   3. A conductive antistatic cable having one end connected to the connection portion, and the other end of the antistatic cable is electrically connected to a conductive component other than the separator. Oil cooler oil separator.   When the separator and the cover plate are attached to the receiver tank, the protruding piece is bent downward so that at least the tip of the protruding piece is pressed against the upper end surface of the receiver tank. The oil separator of the oil-cooled compressor according to claim 2, wherein the installation piece is electrically connected to the receiver tank which is a conductive part other than the separator.   A through hole or notch is formed at the tip of the projecting piece at a position of contact with the upper end surface of the receiver tank, and a bolt hole formed in the upper end surface of the receiver tank through the through hole or notch. 5. An oil separator for an oil-cooled compressor according to claim 4, wherein the protruding piece is pressed against the upper end surface of the receiver tank with a screwed bolt.   4. An alarm means for indicating that the state where the connection portion is electrically connected to a conductive part other than the separator is released is provided in connection with the antistatic cable. Oil separator for oil-cooled compressor.

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