JP6581993B2 - Oil mist collector - Google Patents

Description

  The present invention relates to an oil mist collecting device for removing oil, cutting powder, and the like from a mist-like oil mist generated in a factory or work place.

  In metal processing workplaces such as automobile parts manufacturing factories, cutting oil is applied to the surface of metal, etc. in order to prevent temperature rise and improve machinability during cutting, grinding, and forging of metals. To supply or adhere. However, with this operation, a mist-like oil mist containing oil and cutting powder is generated during processing.

  If this oil mist is left unattended, all parts of the factory will be covered with oil. For example, if it adheres to a fluorescent lamp or a floor surface, the operator may slip and get injured, which causes the working environment to deteriorate, such as darkening the lamp.

  For this reason, some factories may define a limit value of the oil mist concentration from the viewpoint of environmental hygiene, and an oil mist collecting device with high collection efficiency is required.

  Conventionally, a device for efficiently collecting oil or the like from oil mist has been widely used. For example, Patent Document 1 discloses an oil mist collector device. The oil mist sucked into the device casing by the oil mist collector device collides with a rotating oil mist processing plate and utilizes centrifugal force. The oil component is collected by blowing off the oil component toward the inner wall surface of the apparatus casing and attaching the oil component to the inner wall surface.

  In addition, the dust removing device disclosed in Patent Document 2 is provided with a rotating brush body for liquid separation made of natural or synthetic fibers, metal wires, or the like, and rotates the rotating brush body in the same manner as Patent Document 1. In addition, the oil component is dispersed and collected from the oil mist by using centrifugal force to scatter the oil component in the circumferential direction of the rotating brush body.

  This rotating brush has an advantage that clogging is less because the oil component is separated in the circumferential direction by centrifugal force as compared with a rotating disk having a conventional mesh portion.

JP 2008-155093 A JP-A-8-182910

  However, as in Patent Document 2, when the oil content in the oil mist is removed using a rotating brush body, the brush body formed of a bundle of linear materials arranged radially from the center toward the circumferential direction is fast. If the operation is continued in the rotating state, the linear material will be scattered and deformed.

  In particular, it swells and swells toward the tip of the linear material, and swells so that the thickness of the brush tip increases in the gas passage direction, that is, the front-rear direction of the rotating brush body.

  If the tip of the rotating brush body that has been swollen and rotated by rotation has an appropriate degree of scattering, the filter structure becomes three-dimensional in the front-rear direction, so that the collection efficiency increases. However, if the tip of the brush body is greatly separated in the front-rear direction more than necessary, the gap between the linear materials at the tip becomes rough and the filling rate of the linear material becomes low. In addition, it is difficult to collide with the linear material of the rotating brush body, and there is a problem that the oil collecting efficiency is lowered.

  In particular, the linear material arranged closer to the rear falls greatly backward due to the wind current and is deformed with the operation time. The deformed rotating brush body does not return to its original shape even when the rotation is stopped, and the collection efficiency is further reduced.

  In addition, if there is a partition plate or the like where the tip of the linear material of the rotating brush body has fallen backward due to the wind current, the tip of the linear material that has fallen backward will be worn out by contacting the partition plate. There is also a problem that the linear material is shortened.

  An object of the present invention is to provide an oil mist collecting device that eliminates the above-described problems, prevents excessive deformation of a rotating brush body, and efficiently collects and removes oil in a gas.

In order to achieve the above object, an oil mist collecting apparatus according to the present invention includes a sealed box body provided with an inlet and an outlet, and a partition plate for partitioning a gas to pass through a predetermined passage in the box body. An oil mist collecting device comprising: a fan for forcibly generating an air flow so that gas passes through the passage; and a collecting unit for capturing an oil component in the gas, wherein the collecting unit has a disc-shaped rotary brush body rotating at high speed, is arranged behind the rotating brush body, composed of two members and a rear panel you rotate together with the rotary brush member, the rotary brush member is provided at the center And a large number of linear materials that are arranged in a brush shape densely toward the radial direction that is the outside from the disk portion, and to which oil from gas is attached, the disk portion The fixed back plate is arranged behind the end of the linear material. Is characterized as having a plurality of window portions comprising only void gas passes.

  According to the oil mist collecting device of the present invention, by providing a back plate that rotates integrally behind the rotating brush body, it prevents excessive swelling of the linear material of the rotating brush body in the gas passage direction. The predetermined collection efficiency with respect to the oil content can be maintained.

  Further, since the linear material of the rotating brush body can be prevented from bulging in the gas passage direction, the tip of the linear material does not contact the partition plate or the like.

It is an external appearance perspective view of an oil mist collection apparatus. It is a cross-sectional view of an oil mist collection device. It is a disassembled perspective view of a collection part. It is a perspective view of a collection part. It is a perspective view of a sub collection part. It is a front view of the state which combined the collection part and the sub collection part. It is explanatory drawing of the gas which passes a collection part and a sub collection part. It is a log-log graph of the thickness in the width direction at the tip of a linear material and the transmittance. It is a perspective view of the collection part which made the linear material wavy line shape.

The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is an external perspective view of an oil mist collecting device, and FIG. 2 is a cross-sectional view. The oil mist collecting device has a sealed box body 10, and an opening / closing door 11 for performing internal maintenance or the like is attached to a side surface of the box body 10 by a hinge.

  The box 10 is partitioned so that the gas circulates through a predetermined passage, and a partition plate 12 for that purpose is provided. A gas in which oil, cutting powder, or the like is in a mist form enters the box body 10 by a fan 14 made of, for example, a turbo fan that rotates in the box body 10 from a cylindrical suction port 13 provided at the front center of the box body 10. Sucked.

  The sucked gas passes through the collection unit 20 and the sub-collection unit 30, thereby removing oil components including cutting powder and the like in the gas. The gas from which the oil has been collected and removed is discharged from a lattice-shaped discharge port 15 at the top of the box 10.

  The fan 14 is fixed to the rotating shaft 17 of the electric motor 16, and the pipe portion 18 at the lower front of the box 10 is used to collect and extract the oil collected in the oil pan 19 provided at the lower part of the box 10. It is an extraction port provided with a cock (not shown).

  Of the arrows shown in the figure, the arrows filled with dots indicate the flow of gas containing oil mist, and the arrows without dots indicate the flow of gas after collecting and removing oil mist.

  As shown in FIG. 3, the collection part 20 consists of the rotating brush body 21 and the backplate 22, and is made into the shape which bonded together the rotating brush body 21 and the backplate 22 as shown in FIG. .

  In the disk-shaped rotating brush body 21, a large number of synthetic resin linear materials 21b directed radially outward are densely arranged around the central metal disk portion 21a in a brush shape. It is fixed. The linear material 21b is fixed, for example, as a bundle of a plurality of pieces by inserting holes provided in the disk portion 21a.

  The diameter of the rotating brush body 21 is about 30 cm, for example, but an appropriate size is used according to the scale of the installation place, and the linear material 21b has elasticity and flexibility. Although it is preferably made of synthetic resin, there is no problem even if it is made of metal.

  A plurality of the linear materials 21b are arranged in the thickness direction of the rotating brush body 21, but the filling rate of the linear materials 21b, that is, the proportion of the linear materials in the predetermined space is determined by the rotating brush body 21. The collection efficiency is higher as the filling rate is higher. Moreover, the wire diameter of the linear material 21b is about 0.1-0.5 mm, for example, and collection efficiency is so high that a wire diameter is thin. However, the higher the filling rate and the thinner the wire diameter, the more likely to be clogged with oil.

  Therefore, if the wire diameter of the linear material 21b is too thin, the collection efficiency is high at the beginning of use, but clogging with oil occurs with the passage of time, and the collection efficiency is significantly reduced. For this reason, by appropriately selecting the filling rate and the wire diameter of the linear material 21b, oil clogging over time, that is, a reduction in collection efficiency can be alleviated.

  A back plate 22 provided on the leeward side and behind the rotary brush body 21 is made of an annular metal plate or the like, and is formed as a vent at a position corresponding to the back surface of the linear material 21b of the rotary brush body 21. The window portion 22a is provided by punching. The window portion 22a is partitioned by a vertical frame portion 22b arranged along the radial direction with respect to the window portion 22a and an arc frame portion 22c arranged along the circumferential direction so as to cross the window portion 22a.

  The back plate 22 shown in FIG. 3 is partitioned by an outer arc frame portion 22c which is an outer peripheral edge and two inner arc frame portions 22c, and a double window portion 22a is arranged in the radial direction. There is no problem even if the number of arc frame portions 22c is appropriately adjusted so that the portion 22a is single or triple in the radial direction.

  The diameter of the rotating brush body 21 is set to be equal to or slightly shorter than the diameter of the outer peripheral edge of the back plate 22, and the tip of the linear material 21 b is sufficiently in the arc frame portion 22 c at the outermost peripheral edge of the back plate 22. It is trying to overlap.

  When the tip of the linear material 21b does not sufficiently overlap the arc frame portion 22c at the outermost peripheral edge, the tip of the linear material 21b is located behind the window portion of the back plate 22 when the collecting unit 20 rotates at a high speed. The leading end of the linear material 21b swells rearward.

  Therefore, in order to prevent the front end portion of the linear material 21b from entering the back side of the window portion of the back plate 22, the front end portion of the linear material 21b is sufficiently overlapped with the arc frame portion 22c at the outermost peripheral edge. There is a need. The same effect can be obtained when the diameter of the rotating brush body 21 is slightly longer than the diameter of the outer peripheral edge of the back plate 22.

  Conversely, when the diameter of the rotating brush body 21 is too long relative to the diameter of the outer peripheral edge of the back plate 22, the portion of the linear material 21b that is longer than the back plate 22 during high-speed rotation. Swells to the rear of the back plate 22 and repeatedly rubs against the outer peripheral edge of the back plate 22 to cause scuffing, resulting in a problem of shortening the linear material 21b.

  Therefore, in order to prevent the linear material 21b from being worn out by repeated collisions with the back plate 22, the diameter of the rotating brush body 21 is slightly longer than the diameter of the outer peripheral edge of the back plate 22 as described above. preferable.

  In addition, if the length of the vertical frame portion 22b of the window portion 22a is too long with respect to the radial direction, the diameter of the rotating brush body 21 is reduced when the linear material 21b is bent when the collecting portion 20 rotates at a high speed. Even when the diameter is slightly longer than the diameter of the outer peripheral edge of the face plate 22, the linear material 21 b may enter the back side of the window portion 22 a of the back plate 22.

  As a result, the tip of the linear material 21b swells rearwardly, or the linear material 21b repeatedly wears against the arc frame portion 22c, resulting in a problem that the linear material 21b is shortened. Therefore, it is necessary to appropriately adjust the number and interval of the vertical frame portions 22b and the arc frame portions 22c of the window portion 22a so that the length of the vertical frame portions 22b does not become too long in the radial direction.

  Moreover, since the linear raw material 21b arrange | positioned at the center of the backplate 22 is arrange | positioned densely as it goes to the center, there is not enough space for gas to pass through. Accordingly, it is not necessary to provide the window 22 a for allowing gas to pass through the center of the back plate 22, so the window 22 a may be provided only in the vicinity of the outer periphery of the back plate 22. By providing a plate surface without providing the window portion 22a at the center of the back plate 22, the overall rigidity of the back plate 22 can be increased.

  A plurality of screws 23 are screwed into screw holes 22d provided in the back plate 22 through screw through holes 21c of the disk portion 21a of the rotating brush body 21, and the back plate 22 is attached to the rear surface of the disk portion 21a. It is fixed. A rotating shaft 17 that faces the horizontal direction of the electric motor 16 from the rear is fixed at the center of the disc portion 21 a, and the fan 14 is also fixed to the rotating shaft 17 between the collection unit 20 and the electric motor 16. The fan 14 and the rotating brush body 21 are both rotated by driving the electric motor 16.

  A sub-collecting unit 30 shown in FIG. 5 is arranged in a substantially annular combination as shown in FIG. 6 around the rotating brush body 21 installed in the box body 10, and this sub-collecting unit 30. Is fixed in the box 10 by screws or the like. A substantially annular, for example, regular octagonal front plate 31 is provided at the front end of the sub-collecting unit 30, and an annular rear plate 32 is similarly provided at the rear end of the sub-collecting unit 30. A cylindrical frame 33 is arranged on the top.

  The front plate 31 is provided with a plurality of fixing holes 34 for fixing in the box body 10, and a circular hole 35 having an inner diameter slightly larger than the rear plate 22 of the rotating brush body 21. Is provided. Further, the rear plate 32 is also provided with a small hole 36 in the center, and the small hole 36 is slightly smaller than the hole 35 of the front plate 31.

  The cylindrical side surface portion of the frame body portion 33 is divided into several sections, and a plurality of collection filters 37 made of synthetic resin or metal are stretched in these sections. The collection filter 37 has a mesh of about 100 mesh made of synthetic resin or metal wire having a diameter of about 0.1 mm, for example. The front plate 31 of the sub-collecting unit 30 also serves as the partition plate 12 as a gas flow path in the box 10 together with the surrounding frame 33.

  In operation, when the electric motor 16 disposed on the back side of the box 10 is driven, the fan 14 and the collection unit 20 rotate at high speed via the rotating shaft 17. Due to the pressure difference caused by the rotation of the fan 14, a gas containing oil is sucked from the suction port 13 into the box 10 from the left to the right as shown by the arrow in FIG. Pass toward the rear.

  The gas flows from the rotating brush body 21 on the front side toward the back plate 22 on the back side, and most of the gas flows as shown by the arrows in FIG. Pass through force through 22a.

  In the collection unit 20, the rotating brush body 21 rotates at a speed of, for example, 3000 rpm, and the oil component in the gas collides with the linear material 21b and is attached to and captured by the linear material 21b. The gas that has passed through the collection unit 20 flows upward and is discharged from the discharge port 15 to the outside of the box 10 as indicated by the arrow in FIG.

  In this collection process, the oil content captured by the linear material 21b is agglomerated on the linear material 21b and remains on the linear material 21b as a lump as it is. It is separated from the linear material 21b by the centrifugal force generated by the rotation of the 21 at a high speed and the vibration force of the linear material 21b, and blown away in the outer circumferential direction.

  The oil scattered in the outer peripheral direction collides with the collection filter 37 of the sub-collection unit 30 installed so as to surround the rotary brush body 21 together with the air flow generated by the high-speed rotation of the rotary brush body 21. When it hits, the oil component adheres to the collection filter 37 and the gas passes through. The adhering oil component becomes liquid on the surface of the collection filter 37, moves while flowing down to the lower part due to gravity, and is collected in an oil pan 19 provided at a predetermined position below the box 10.

  The back plate 22 is provided with a window portion 22a at a portion corresponding to the tip of the linear material 21b and serves as a vent hole. The window portion 22a is provided with an arc frame portion 22c. The material 21b is supported by the arc frame portion 22c. Therefore, even when a strong airflow is generated from the front surface to the rear surface of the collection unit 20 due to the rotation of the fan 14, the linear material 21b is prevented from falling backward, and the filling rate of the linear material 21b is reduced. The linear material 21b does not swell in the gas passage direction.

  Moreover, since the front-end | tip part of the linear raw material 21b spreads in the width direction toward the front of the collection part 20 because the collection part 20 rotates at high speed, the part of the line | wire of the linear raw material 21b is considered in consideration of the part to expand. It is necessary to set the length and arrangement density.

  Therefore, an experimental example of the transmittance P obtained by subtracting the collection efficiency η indicating the ratio of collection from 1 when the thickness of the linear material 21b spread in the width direction was measured. As experimental conditions, the diameter of the linear material 21b is 0.2 mm, the length is 9 cm, the number is 15000, the thickness H1 in the width direction of the linear material 21b in the vicinity of the disk portion 21a is 3 mm, and the diameter is about 33 cm. The collection unit 20 was rotated at 2900 rpm. Then, a predetermined amount of oil was passed through the collection unit 20, and the collection efficiency η and the transmittance P were calculated from the predetermined amount of oil and the recovered oil.

  FIG. 8 is a log-log graph showing the relationship between the thickness H2 and the transmittance P when the front end of the linear material 21b is expanded in the width direction. It can be seen that the thickness H2 of the tip portion of the linear material 21b is the lowest when the thickness H2 expands from about 3 mm before rotation to about 5 mm after rotation, that is, the collection efficiency η increases. Therefore, in consideration of the fact that the arrangement interval of the linear materials 21b in the vicinity of the disc portion 21a is expanded two to three times from before the rotation when the collection unit 20 rotates at high speed, the wire diameter and length of the linear materials 21b are increased. It is necessary to select the number density and material appropriately.

  On the other hand, the gas by the leak flow which goes around the front-end | tip part of the linear raw material 21b of the rotating brush body 21 without passing through the rotating brush body 21 of the collection part 20 exists. This gas is sucked by the air flow generated in the sub-collecting unit 30 through the collecting filter 37 in the outer direction, that is, in the vertical direction in the explanatory view of the passing gas in FIG. 7, and the oil component is collected by the collecting filter 37. Is done.

  Further, by providing the rear plate 32 in the sub-collecting unit 30, the leak flow is blocked and the gas easily flows in the direction passing through the collection filter 37. Note that there is no problem even if the rear plate 32 is not provided in the sub-collecting unit 30.

  The gas from which the oil component has been removed by passing through the collection filter 37 is discharged from the discharge port 15 together with the gas that has passed through the collection unit 20 as shown by the arrows in FIGS. .

  The oil collected by the gas passing through the sub-collecting unit 30 is blown off by the collecting unit 20 and flows down together with the oil adhering to the collecting filter 37, and the lower part of the collecting filter 37. The oil falls and is stored in the oil pan 19. The accumulated oil is extracted from the pipe portion 18 to the outside at an appropriate time interval.

  In addition, in the Example, although the sub collection part 30 was demonstrated, without providing this sub collection part 30, an oil part is made to collide with the position of the sub collection part 30, and only as an adhesion part of an oil part A functioning inner wall surface may be provided. In this case, the oil is collected by flowing down the inner wall surface and dropping from a hole provided in the lower portion of the inner wall surface.

  Moreover, although the fan 14 and the rotating brush body 21 are operated by the same electric motor 16, they can be rotated by separate electric motors when these rotational speeds are made different.

  In addition, when a comparison experiment was performed under the above-described experimental conditions between the case where the collecting plate 20 was not provided with the back plate 22 and the case where the collecting plate 20 was provided, the collecting material 20 provided with no back plate 22 was rotated during the rotation. The thickness H2 of the tip in the width direction reached about 45 mm, and the collection efficiency η indicating the rate of collection was 86.5%. On the other hand, in the collection part 20 provided with the back plate 22, the thickness H2 in the width direction of the front end part of the linear material 21b is about 5 mm as described above, and the collection efficiency η reaches 92.0%. did. In other words, 13.5% of the oil that could not be removed was reduced to 8% by providing the back plate 22, and about 40% of the oil that could not be removed would be reduced to the back plate 22. It can be collected by providing.

  Moreover, although the linear material 21b of the collection part 20 shown to FIG. 3, FIG. 4 was demonstrated using the linear thing, as shown in FIG. 9, the shape of linear material 21b 'is a wavy line shape. May be adopted. When the linear material 21b continues to be used, the linear material 21b repeats a state in which the linear material 21b is swelled and swelled during use, and a state in which the linear material 21b is not swelled when not in use. Falls easily and is always in close contact with the adjacent linear material 21b.

  As described above, the linear materials 21b that are linear are easily brought into close contact with each other, and when the linear materials 21b are in line contact with each other, an oil component accumulates and adheres between the linear materials 21b. The linear materials 21b are further brought into close contact with each other due to the adhered oil, and the linear materials 21b are difficult to separate.

  Therefore, as shown in FIG. 9, even if some of the linear materials 21b ′ are collapsed by making the linear materials 21b ′ wavy, gaps are easily generated between the linear materials 21b ′, and the oil content is reduced. Will not accumulate.

  In addition to the wavy line shape, the shape of the linear material 21b 'can also be appropriately adopted as the shape in which the adjacent linear materials 21b' are difficult to be in close contact with each other.

DESCRIPTION OF SYMBOLS 10 Box body 12 Partition plate 13 Inlet 14 Fan 15 Outlet 16 Electric motor 20 Collection part 21 Rotating brush body 21b Linear material 22 Back surface plate 22a Window part 30 Sub-collection part

Claims (7)

In order to forcibly generate an airflow so that the gas passes through the passage, and a box that is provided with a suction port and a discharge port and is sealed, a partition plate that partitions the gas so as to pass through a predetermined passage, An oil mist collecting device comprising a fan and a collecting portion for collecting oil in the gas,
The collector includes a disc-shaped rotary brush body rotating at high speed, is arranged behind the rotating brush body, composed of two members and a rear panel you rotate together with the rotary brush member,
The rotating brush body includes a disc portion provided in the center, and a large number of linear materials that are closely arranged in a brush shape in a radial direction that is outward from the disc portion, and to which oil from gas is attached. And
The back plate fixed only to the disc portion is disposed behind the front end portion of the linear material, and has a plurality of window portions composed only of gaps through which gas passes, and oil mist collection apparatus.   The oil mist collecting device according to claim 1, wherein the linear material is made of a synthetic resin. 3. The oil mist collecting device according to claim 1, wherein the rotating brush body allows an air flow to pass from a front surface toward the back plate on the back surface. The window portion is partitioned by a vertical frame portion arranged along a radial direction with respect to the window portion, and an arc frame portion arranged along a circumferential direction so as to cross the window portion. The oil mist collection device according to any one of claims 1 to 3 . In the outer circumferential direction of the rotary brush member, to any one of claims 1-4, characterized in that a attachment means of the oil fraction splattered become oil droplets by centrifugal force from the rotating brush body The oil mist collecting device as described. 6. The oil mist collecting apparatus according to claim 5 , wherein the adhering means flows down the adhering oil component downward and collects it in the lower part of the box. The oil mist collecting device according to any one of claims 1 to 6 , wherein the linear material is wavy.

Images