JP4946234B2 - Exhaust automatic oil draining method - Google Patents

Description

The present invention collects the oil mist that is released into the atmosphere by an exhaust cleaner, relates to an oil discharge device for separating, exhaust automatic drain oil for accommodating and discharging oil accumulated in the oil receiving portion of the exhaust cleaner in a predetermined container Regarding the method .

In general industrial machinery, oil is supplied as mist by compressed air to an air cylinder, a spindle, or the like. When this oil mist is discharged into the atmosphere, there are problems such as air pollution and exhaust noise when discharged at high speed. Various silencers and exhaust cleaners are installed to prevent these problems. The oil collected in the oil receiving portion of the exhaust cleaner is manually discharged, but there is a problem that if the discharge work is neglected, the oil will overflow from the oil receiving portion of the exhaust cleaner to the floor.

As a countermeasure, for example, as described in Patent Document 1, the oil separated by the exhaust cleaner 19 is stored in a recovered oil tank 19 ′. The recovery oil tank 19 ′ is connected to the plunger chamber 40 a of the recovery pump 40 by a conduit 41, and the plunger chamber 40 a is connected to the tank 22 by a check valve 42 and a conduit 43. The oil stored in the tank 22 is communicated with the cylinders 4 and 5 via the check valves 25 and 26 from the pipelines 24 a and 24 b branched from the pipeline 24 via the particulate generation nozzle 23.

The air in the main air passage 1 is introduced into the head chamber side of the cylinders 4 and 5 of the booster pump through the branch pipes 3a and 3b, and is introduced into the rod side chamber through the differential pressure adjusting valve 14 and the direction switching valve 13. The increased pressure supplied to the head side chamber to be introduced is guided to the fine particle generating nozzle 23 through the pipe line 24, and the generated fine particles are atomized and supplied to the main air passage 1 through the pipe line 29 and are predetermined by the air flow. Sent to the place. On the other hand, the oil stored in the tank 22 is reused (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 63-35803

However, in Patent Document 1, a recovery oil tank 19 ′ is installed under the drain portion of the exhaust cleaner 19, and the oil in the recovery oil tank 19 ′ is stored in the oil tank 22 via the conduit 43 by the recovery pump 40. However, it has become complicated and large, and it has been difficult to reduce costs.
Furthermore, when a rotary oil pump is used instead of the reciprocating recovery pump 40, the amount of oil mist stored in the recovery oil tank 19 'disposed below the exhaust cleaner 19 is relatively small. It is necessary to turn the rotary oil pump on and off. In the case of ON-OFF control, valves such as an oil amount detection sensor and a relief valve are required, and there is a problem that the control and system are complicated and large. Further, when the rotary oil pump is operated in the absence of oil, there is a problem that the rotary oil pump is seized.
Furthermore, when the pipe is connected to the recovered oil tank 19 'to attempt centralized management, the installation height of the exhaust cleaner 19 is at the lower part of the machine body, so that the capacity of the recovered oil tank 19' is limited.

In view of the above-mentioned problems, the problem of the present invention is that the oil accumulated in the oil receiving portion of the exhaust cleaner is not manually discharged, the size of the separate tank is not limited, the structure is simple, and the control is easy. An object is to provide an easy automatic oil draining method .

In order to solve the above-mentioned problem, the present invention as set forth in claim 1 is characterized in that lubricating oil accumulated in an oil receiving portion of an exhaust cleaner attached to a compressed air exhaust port is sucked by an oil discharge pump, and the oil discharge pump is used. In a device that discharges to a predetermined oil tank from a discharge port of the oil, a drain port that opens downward is provided at a lower portion of the oil receiving portion, and the oil discharge pump reciprocates a movable iron core by an electromagnetic coil to act as a pump. The electromagnetic pump includes a resin yoke provided in an electromagnetic coil, and includes at least an inlet, an inlet check valve, and an inner hole. A movable iron core that reciprocates in the axial direction, an outlet check valve, and a discharge port are sequentially arranged in the axial direction, and the suction port and the discharge port are provided in the axial direction of the drain port. Mouth is upper When the discharge port of the electromagnetic pump is larger than the amount remaining in the oil receiver, the electromagnetic pump can be operated even when the oil receiver is operated without oil. It is characterized by not being seized.

According to the present invention, it is not necessary to manually discharge the oil accumulated in the exhaust cleaner oil receiving portion, and the scattering of the oil generated at the time of discharging is also eliminated. In addition, the electromagnetic pump is so small that it can be directly attached to the drain port of the exhaust cleaner via a joint. In addition, there is no need to consider special mounting brackets, etc., and additional mounting can be easily performed. Further, by directly attaching to the drain port of the exhaust cleaner via a joint, the suction resistance can be minimized. In addition, oil leakage from the piping can be minimized . In addition, if the discharge amount of the electromagnetic pump is larger than the amount accumulated in the oil receiver of the exhaust cleaner, the guide (yoke) part is molded with resin even if it is operated without oil in the oil receiver of the exhaust cleaner. As a result, the electromagnetic pump will not burn.

Furthermore, in the invention described in claim 2, wherein the electromagnetic pump is an electromagnetic pump whose flow rate is to variably the frequency or duty ratio of the ON-OFF current or voltage applied to the electromagnetic coil, wherein By providing a control device capable of controlling the applied current or voltage of the electromagnetic coil, and when the discharge amount of the electromagnetic pump is larger than the amount remaining in the oil receiver, the oil receiver is operated without oil By changing the flow rate to a flow rate that matches the high speed and low speed, or by stopping the injection, control according to various operating conditions is possible.

  In the present invention, the oil mist that has flowed into the exhaust cleaner is released to the atmosphere in the exhaust cleaner, and the oil is stored in the oil storage tank by the operation of the electromagnetic pump integrated with the exhaust cleaner. There is no need to collect oil manually. In addition, the oil does not overflow or leak from the container, and the structure is simple.

A preferred embodiment of an exhaust automatic oil draining apparatus according to the present invention will be described below and described in detail with reference to the accompanying drawings. FIG. 1 is a schematic external view of an exhaust automatic oil draining apparatus 10 showing an embodiment of the present invention. In FIG. 1, an exhaust automatic oil draining apparatus 10 includes an exhaust cleaner 20 and a joining member screwed to the exhaust cleaner 20, for example, an electromagnetic pump 40 joined to a joint 13 by a screw mechanism. One side of the exhaust cleaner 20 is joined by a screw mechanism to a pipe line 14 for introducing oil mist flowing out from a machine (not shown).
FIG. 2 is a longitudinal sectional view showing a schematic structure of a known exhaust cleaner 20. In Fig 2, the holder 21 is screwed through line 14 (see FIG. 1) to the screw mechanism has a suction port 21a of the air, has a vent hole 21b at a plurality of locations on the lower peripheral surface. Reference numeral 22 is an upper end plate, 23 is a breathable core material made of, for example, a cotton core, 24 is a main filter material made of, for example, microglass fiber, 25 is a perforated plate, 26 is an auxiliary filter material, 27 is a cover member, and 28 is a cover member. A lower end plate is shown, and these elements 22 to 28 constitute an element 29.

Reference numeral 30 denotes a bolt member for fixing the element 29 to the holder 21. One end (upper end in FIG. 2) of the bolt member 30 is screwed to the holder 21, and the other end of the bolt member 30 (in FIG. 2). By screwing the lower end to the nut 31, the holder 21 and the element 29 are tightened together. Reference numeral 32 is a transparent bottomed oil case, which is inserted into one end of the element 29 (downward in FIG. 2). An insert 34 having a drain port 33 is formed at the center of the oil case 32, and the oil case 32 is fixed by screwing the insert 34 to the bolt member 30.
In the exhaust cleaner 20 configured as described above, the core member 23 is formed of, for example, cotton having a filtration degree of 5 μ in a cylindrical shape, and oil having a relatively large particle size in the particle size distribution of the supplied oil mist. It functions as a core material for fixing the pre-filter that captures and aggregates mist and the micro glass fiber that is the main filter medium.
The main filter medium 24 has a filtration degree of 0.3 μm, for example, and can capture and aggregate the minimum oil mist particles. The microglass fiber has lower adhesion than the filter paper and the filtration degree is kept constant, so that the difference in pressure loss between the dry state and the wet state with oil can be kept small.

A perforated plate 25 is provided on the outer side of the main filter medium 24. The perforated plate 25 is formed into a cylindrical shape, folded back at the periphery, engaged in a hook shape, and can be attached without damaging the microglass fiber. The fiber is spread to the outside by the force of the air flow, and is fixed so as to protect it from making the hole diameter coarse. An auxiliary filter medium 26 is provided outside the perforated plate 25 to serve as a gravity sedimentation medium for the flocculated oil. The auxiliary filter medium 26 has a good sound deadening property, is rich in lipophilicity, and has a high porosity, for example, a fineness of 360 to 520 denier and a density of about 180% in order to reduce the flow velocity so as to suppress re-scattering of the flocculated oil. Is used.
Furthermore, a cylindrical cover member 27 made of a breathable expanded metal is provided on the outermost periphery of the element 29 to suppress the movement of the auxiliary filter medium 26.
The circumferential surface of the cover member 27 is open to the atmosphere, and the passing air from the element 29 is released from this wide surface.

The core member 23 to the cover member 27 are fixed at the upper end to the upper end plate 22 with a thermoplastic adhesive, and the lower end is fixed to the lower end plate 28 with the core member 23 to the perforated plate 25 as element components. . Accordingly, the oil component agglomerates and grows in the process of air flowing from the inner surface to the outer peripheral surface of the element 29, gravity-precipitated in the layer of the auxiliary filter medium 26, passes through the wire mesh 35, and drops into the oil case 32.
On the other hand, noise generated by a solenoid valve (not shown) or the like attached to the tip of the conduit 14 is sound waves, that is, vibration of air particles in the pores of the core material 23 and the main filter material 24 of the element 29, and resistance of the pore walls. Is attenuated with the propagation distance. In addition, it is known that the intensity of turbulent noise is proportional to the 8th power of the flow velocity, so that the diameter of the cover member 27 does not become smaller than twice the diameter of the porous plate 25 in order to reduce the flow velocity at the discharge surface. It is configured. As a result, the discharged air is discharged as clean air with a low noise level that does not contain oil, and the oil remaining in the oil case 32 can be collected in a timely manner.

FIG. 3 is a longitudinal sectional view showing a schematic structure of the electromagnetic pump 40.
As shown in FIG. 3, the electromagnetic pump 40 is inserted into the inner side 43 a of the coil case 41 and is disposed on one end side (upper end in FIG. 3) of the electromagnetic coil 42, and the yoke 44. And a fixed iron core 45 which is inserted into the inner side 43b from the other end side (the lower end in FIG. 3) of the electromagnetic coil 42. The fixed iron core 45 has a flange portion 45a that engages with the other end of the electromagnetic coil 42 on one side, a central portion 45b that is fitted into the inner side 43b of the electromagnetic coil 42, and a side wall portion 45c on the other side. Is provided. The central portion 45b has a concave cross section, and an outlet sheet 46 having an outlet hole 45d is formed in the side wall portion 45c.

A cylindrical portion 47 a of the discharge side main body 47 is fitted into the central portion 45 b of the fixed iron core 45, and the flange portion 47 b of the discharge side main body 47 is connected to the flange portion 45 a of the fixed iron core 45 and one end portion 48 a of the case 48. The discharge-side main body 47 is fixed to the fixed iron core 45 by crimping.
The discharge side body 47 is provided with a through hole 47c penetrating in the axial direction, and one end (lower end in FIG. 3) of the through hole 47c communicates with a drain oil collecting pipe 49 connected to an oil tank tank (not shown). A discharge port 50 is formed, and an oil drainage collecting pipe 49 is connected by a screw mechanism provided in the discharge port 50.

  Reference numeral 52 denotes a spring member (first spring member) fitted into the through hole 47c of the discharge side main body 47. One end of the spring member 52 is engaged with the step portion 53 of the through hole 47c, and the like. The end is brought into contact with the outlet ball 54, and functions to press the outlet ball 54 against the outlet seat 46 by urging the outlet ball 54 in the axial direction by the elastic force of the spring member 52. In this case, the spring member 52, the outlet ball 54, and the outlet seat 46 form an outlet check valve 55 that allows liquid, for example, oil to pass only from one side (upper end in FIG. 3) to the other end (lower end in FIG. 3). Yes.

  A movable iron core (plunger) 57 is provided on the inner side 43c of the yoke 44 so as to be capable of reciprocating in the axial direction between a stopper 56 having a central through hole 56a and fixed to the yoke 44 and the fixed iron core 45. It has been. The movable iron core 57 is provided with an inlet hole 58a having an inlet sheet 58 on one side and opened on the other side. A spring member (second spring member) 59 and an entrance ball 60 are housed in the inner hole 57 a of the movable iron core 57. One end of the spring member 59 is in contact with the outer end surface of the side wall 45 c of the fixed iron core 45, and the other end is engaged with the inner end surface of the inner hole 57 a of the movable iron core 57. The entrance ball 60 is loosely inserted inward of the spring member 59. Accordingly, the entrance ball 60 is disposed in the spring member 59 so as to be movable along the bending direction. Further, the movable iron core 57 presses the spring member 59 and the entrance ball 60 against the entrance sheet 58 by the elastic force of the spring member 59 when the electromagnetic coil 42 is not excited.

In this case, an inlet check valve 61 that allows liquid, for example oil, to pass only from one side (upper end in FIG. 3) to the other side (lower end in FIG. 3) from the spring member 59, the inlet ball 60, and the inlet seat 58 is formed. . Further, in the inlet check valve 61, a spring member (third spring member) 62 that presses the inlet ball 60 against the inlet seat 58 is disposed on the inner diameter of the spring member 59. By pressing the inlet ball 60 against the inlet seat 58 by force, the electromagnetic pump 40 can be disposed horizontally or obliquely in addition to the vertical position shown in FIG.
The stopper 56 is provided with a suction side main body 64 provided with a suction port 63 in contact therewith. Here, suction is performed by crimping the flange portion 64 a of the suction side main body 64, the yoke 44, the electromagnetic coil 42, the flange portion 45 a of the fixed iron core 45, and the flange portion 47 b of the discharge side main body 47 with both end portions 48 a and 48 b of the case 48. The electromagnetic pump 40 is configured with the side main body 64 and the discharge side main body 47 oriented in the axial direction. A joint 13 (see FIG. 1) is screwed to the suction side main body 64 by a screw mechanism. Reference numeral 65 is a terminal for energizing the electromagnetic coil 42.

When the movable iron core 57 is reciprocated by turning on and off an electric signal to the electromagnetic coil 42 of the electromagnetic pump 40, oil is sucked from the inlet check valve 61 side and the outlet 50 is discharged from the outlet check valve 55 side. And is ejected from the discharge port 50 of the discharge side main body 47 to the oil collecting pipe 49.
The electromagnetic pump 40 can change the flow rate by changing the ON / OFF frequency and duty ratio of the current or voltage applied to the electromagnetic coil 42, and can control the flow rate according to the high speed and low speed, or stop the injection. In other words, control according to various operating conditions is possible.

The automatic oil draining apparatus 10 according to the present embodiment is basically configured as described above, and the operation will be described next.
In FIG. 1, a used oil mist (not shown) is supplied as a lubricant to a rotating portion of a machine (not shown), and is discharged continuously or discontinuously to a pipe 14, and is sucked into a holder 21 of an exhaust cleaner 20. It flows into 21a.
The oil mist that has flowed into the vent hole 21b from the suction port 21a passes through the core member 23, the main filter medium 24, the perforated plate 25, and the auxiliary filter medium 26 and is released from the cover member 27 to the atmosphere.
On the other hand, a used liquid, for example oil, drops into the vent hole 21b and is stored in the oil case 32, and sequentially flows from the joint (see FIG. 1) 13 into the suction port 63 of the suction side main body 64 of the electromagnetic pump 40. .

The electromagnetic pump 40 is controlled by a control device (not shown) so that the electromagnetic coil 42 is turned on for a predetermined cycle, for example, 0.2 seconds and turned off for 2 seconds.
That is, when the electromagnetic coil 42 is not energized, that is, when the electromagnetic coil 42 is not energized (OFF), the movable iron core 57 is displaced in the direction of the arrow Y by the elastic force of the spring member 59, and the movable iron core 57 is moved. Contact the stopper 56. At this time, the entrance ball 60 is in contact with the entrance sheet 58 of the movable iron core 57 by the elastic force of the spring member 62.
When the electromagnetic coil 42 is energized and energized (ON), the movable iron core 57 is displaced in the direction of the arrow X against the elastic force of the spring members 59 and 62 and is attracted to the fixed iron core 45. At this time, the oil flowing into the suction port 63 of the suction side main body 64 passes through the inner hole 57a of the movable core 57 through the inlet hole 58a of the movable core 57 from the central through hole 56a of the stopper 56 and passes through the inner hole 57a of the movable core 57. An oil ball that flows into the outlet hole 45d, pushes and opens the outlet ball 54 on which the spring force of the spring member 52 acts, flows into the through hole 47c, is discharged from the discharge port 50, and is discharged from the oil collecting pipe 49, not shown. It is stored in.

In the automatic oil draining apparatus 10 according to the embodiment of the present invention, the oil mist that has flowed into the exhaust cleaner 20 is released into the atmosphere in the exhaust cleaner 20, and the electromagnetic is integrated with the exhaust cleaner 20. Since the oil is stored in the oil storage tank by the pump 40, it is not necessary to manually collect the oil. Further, the oil does not overflow or leak from the container, and the structure is simple and the control is easy .

FIG. 4 is a schematic external view of an exhaust automatic oil draining apparatus 90 according to the fourth embodiment of the present invention. 6 is characterized in that the exhaust cleaner 20 and the electromagnetic pump 40 are integrated with each other by removing the joint 13 shown in FIG. That is, the oil case main body 91 is formed by integrating the oil case 32 shown in FIG. 2 and the suction side main body 64 shown in FIG. As a result, the oil case main body 91 is screwed to the bolt member 30, and the exhaust cleaner 20 and the electromagnetic pump 40 are integrally formed by crimping the end portion of the case 48, for example, 48b.
In the exhaust automatic oil drain device 90, the exhaust cleaner 20 and the electromagnetic pump 40 are arranged on a substantially straight line .
Therefore, the exhaust automatic oil draining device 90 is made compact by integrating the exhaust cleaner 20 and the electromagnetic pump 40, and oil leakage from the part engaging the parts can be reduced.

1 is a schematic external view of an exhaust automatic oil draining apparatus according to a first embodiment of the present invention. FIG. 1 is a schematic longitudinal sectional view of the exhaust cleaner. FIG. 2 is a schematic longitudinal sectional view of the electromagnetic pump of FIG. 1. It is a schematic block diagram of the exhaust automatic oil draining apparatus which concerns on 2nd embodiment of this invention.

10, 70, 80, 90 Exhaust automatic oil drain device 20 Exhaust cleaner 21 Holder 23 Core material 24 Main filter medium 25 Perforated plate 26 Auxiliary filter medium 27 Cover member 29 Element 32 Oil case 33 Drain port 40 Electromagnetic pump 42 Electromagnetic coil 44 Yoke 45 Fixed Iron core 47 Discharge side main body 47c York inner surface 48 Case 49 Drained oil collecting pipe
50 Discharge port 55 Outlet check valve
57 Movable iron core 57a Inner hole
61 Inlet check valve 63 Suction port 64 Suction side body 91 Oil case body

Claims (2)

In the apparatus for sucking the lubricating oil accumulated in the oil receiving portion of the exhaust cleaner attached to the compressed air exhaust port by the oil discharge pump and discharging it to a predetermined oil tank from the discharge port of the oil discharge pump, the oil receiver A drain port that opens downward is provided at the bottom of the part, and the oil discharge pump is an electromagnetic pump configured to reciprocate a movable iron core with an electromagnetic coil to perform a pump action , A resin yoke provided on the electromagnetic coil, and at least a suction port, an inlet check valve, a movable iron core having an inner hole and reciprocating in the axial direction on the inner surface of the yoke, and an outlet check valve; And the discharge port are sequentially arranged in the axial direction, the suction port and the discharge port are provided in the axial direction of the drain port, the suction port is arranged at the top, and the discharge port is arranged at the bottom, Electromagnetic Discharge amount of pump is, when greater than the amount remaining in receiving the oil, even if is operated in the absence of oil receiving said oil, wherein said being in so that no electromagnetic pump seizing Exhaust Automatic oil draining method . In the exhaust automatic oil draining device according to claim 1 ,
The electromagnetic pump is an electromagnetic pump in which the flow rate can be varied according to the ON / OFF frequency or duty ratio of the current or voltage applied to the electromagnetic coil, and the applied current or voltage of the electromagnetic coil can be controlled. controller Bei example, said discharge rate of the electromagnetic pump is, when greater than the amount remaining in receiving the oil, exhaust automatic drain oil wherein the to run in the absence of oil receiving the oil.

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