JP2022082023A - Oil mist collection device - Google Patents

Abstract

To provide an oil mist collection device having a sub collection part that can efficiently collect oil contents in gas over a long time.SOLUTION: A sub collection part 50 that collects oil contents in airflow K2 is arranged in a positive pressure chamber 41, and the sub collection part 50 is constituted of a first sub collection part 51 and a second sub collection part 52 arranged at an upstream side of the first sub collection part 51. A plurality of oil ejection holes 13d are arranged penetratingly in a horizontal direction on a side surface 13b facing a negative pressure chamber 40, and the negative pressure chamber 40 is communicated with the positive pressure chamber 41 through the oil ejection holes 13d. The oil contents collected by the sub collection part 50 are pushed out by a difference in pressure between the positive pressure chamber 41 and the negative pressure chamber 40 into the negative pressure chamber 40 through the oil ejection holes 13d to fall down on a bottom surface plate at a lower side.SELECTED DRAWING: Figure 4

Description

The present invention relates to an oil mist collecting device that removes an oil component from a mist-like oil mist generated in a factory or a work place.

For example, in the metal processing industry such as a machine parts manufacturing factory, cutting oil is applied to the surface of a metal material in order to prevent a temperature rise and improve machinability during cutting, grinding, and forging of metal. Is being supplied or applied. However, along with this work, it is inevitable that mist-like oil mist containing oil and cutting powder will be generated during processing.

In such an environment, a device for efficiently collecting oil from oil mist has been conventionally used. For example, FIG. 8 of Patent Document 1 discloses an oil mist removing device in which an exhaust port for exhausting upward is provided and an exhaust side filter is arranged in the exhaust port.

By arranging the exhaust side filter for the air flow flowing upward, the oil content in the air flow that has been completely collected is collected, and the oil content is not easily scattered outside the device.

Japanese Unexamined Patent Publication No. 2005-199170

However, as shown in FIG. 8 of Patent Document 1, it is preferable that oil is appropriately dropped from the exhaust side filter to the exhaust port, but in reality, since the air flow is constantly generated from the lower side to the upper side, the oil content. The dripping of the oil is hindered by this air flow, and the oil component remains in the exhaust side filter.

Therefore, the amount of oil remaining in the exhaust side filter is larger than the amount of oil dripping, and the oil content is gradually accumulated in the exhaust side filter with the passage of time. If too much oil is accumulated in the exhaust side filter, the discharge efficiency will decrease as the pressure loss increases, and at the same time, the oil collection efficiency will also decrease.

In order to maintain these exhaust efficiency and collection efficiency, it is necessary to periodically clean and replace the exhaust side filter. Alternatively, by stopping the drive unit of the oil mist removing device, the oil component remaining from the exhaust side filter is gradually dropped, but it takes time to remove the oil.

An object of the present invention is to solve the above-mentioned problems, and it is possible to efficiently collect oil in a gas that could not be collected by the main collection unit for a long period of time by the sub-collection unit. The purpose is to provide an oil mist collecting device.

The oil mist collecting device according to the present invention for achieving the above object rotates a rotating fan portion in a sealed box body portion provided with an intake port and an exhaust port to generate an air flow and collects the main air. A main collecting part that collects oil by a filter, a sub-collecting part that collects oil that could not be collected by the main collecting part, and the airflow circulate and pass through a predetermined passage. It is an oil mist collecting device in which a partition plate partitioned so as to be provided is provided, and an oil discharge hole is provided on the side surface of the partition plate on the side of the sub-collection portion, and the oil discharge hole is the passage. It is a hole that communicates a negative pressure chamber that is upstream of the main collection section and leads to the intake port and a positive pressure chamber that is downstream of the main collection section and leads to the exhaust port. It is a feature.

According to the oil mist collecting device according to the present invention, by providing an oil discharge hole on the side surface of the partition plate on the side of the sub-collecting portion, the oil component that could not be completely collected by the main collecting portion is sub-collected. The oil collected by the collecting section and collected by the sub-collecting section can be discharged from the positive pressure chamber to the negative pressure chamber by utilizing the pressure difference between the positive pressure chamber and the negative pressure chamber.

It is a perspective view of the oil mist collecting device. It is sectional drawing of the oil mist collecting device. It is a perspective view of a collecting board. It is sectional drawing of a positive pressure chamber. It is a front view of the baffle plate of the 2nd sub-collection part. It is an operation explanatory diagram of the 2nd sub-collection part.

The present invention will be described in detail with reference to the illustrated examples.
FIG. 1 is a perspective view of an oil mist collecting device, and FIG. 2 is a cross-sectional view. The oil mist collecting device is composed of a sealed box body portion 10 that collects oil from a mist-like oil mist, and a box outer portion 20 connected to the box body portion 10. A cylindrical intake port 11 for sucking oil mist, an exhaust port 12 for removing oil from the oil mist and discharging the oil mist, and an air flow K1 sucked into the box body 10 are predetermined to the box body 10. A partition plate 13 is provided so as to circulate and pass through the passage.

The intake port 11 and the exhaust port 12 are arranged on the top plate 14 of the box body portion 10. The air flow K1 of the oil mist containing the oil component is sucked into the box body portion 10 from the upper intake port 11 downward, the oil component is collected by the main collection section 30, and is partitioned by the partition plate 13. Go through the aisle. Then, the airflow K2 is directed from the lower side to the upper side, the oil component remaining in the sub-collecting portion 50 is removed, and the oil is discharged to the outside of the box body portion 10 through the exhaust port 12.

An opening / closing portion 15 that can be removed during maintenance is provided on the front surface of the box body portion 10, and an oil discharge port 17 is provided below the opening / closing portion 15. The oil content dropped into the box body portion 10 will be accumulated in the vicinity of the oil discharge port 17 via the inclined bottom plate 16. The oil discharge port 17 is provided with a liquid seal in a pipe (not shown) to prevent backflow, so that the oil component accumulated in the bottom plate 16 can be discharged to the outside.

A base portion 21 that supports the box body portion 10 is arranged on the back side of the box body portion 10, a drive portion 22 such as a motor is arranged on the base portion 21, and a drive portion is inside the base portion 21. It has a built-in power supply unit that operates.

A main collecting section 30 is arranged in the center of the box body portion 10, and the main collecting section 30 is composed of a disk-shaped collecting disk 31 and a rotating fan section 32, and the collecting disk 31 is rotated. The fan unit 32 is configured to be rotated by a rotation shaft 33 of the drive unit 22 facing in the horizontal direction.

FIG. 3 is a perspective view of the collection board 31, in which a plurality of metal frame portions 34 are provided around the collection board 31, and a net-like main collection filter 35 is fixed to the frame portions 34. There is. The rotation shaft 33 is rotated by the drive of the drive unit 22, and the collection board 31 and the rotation fan unit 32 are both rotated by the rotation shaft 33.

Further, the passage defined by the partition plate 13 in the box body portion 10 is negatively pressured by the rotating fan portion 32, and rotates with the negative pressure chamber 40 on the upstream side of the rotating fan portion 32 and leading to the intake port 11. The positive pressure is generated by the fan portion 32, and the pressure is divided into a positive pressure chamber 41 which is on the downstream side of the rotary fan portion 32 and leads to the exhaust port 12.

FIG. 4 is a cross-sectional view of the positive pressure chamber 41. In the positive pressure chamber 41, a sub-collection unit 50 for collecting oil in the airflow K2 that could not be collected by the main collection unit 30 is arranged. ing. The sub-collection section 50 has a first sub-collection section 51 horizontally installed immediately before the exhaust port 12 of the box body section 10 and a vertical direction on the upstream side of the first sub-collection section 51. It is composed of a second sub-collection section 52 installed, and the first sub-collection section 51 and the second sub-collection section 52 are arranged in order along the flow of the airflow K2.

The first sub-collecting portion 51 is made of a flat plate-shaped filter material made of a non-woven fabric or the like, and the filter material is horizontally formed on a wire mesh 19 fixed to a step portion 13a of a partition plate 13 near the upper surface of the box body portion 10. It is placed. The side L-shaped step portion 13a is composed of a side surface 13b around the filter material along the vertical direction and a horizontal plane 13c along the horizontal direction orthogonal to these side surfaces 13b, and the wire net 19 is fixed by the horizontal plane 13c. Has been done.

A plurality of substantially circular oil discharge holes 13d having a predetermined spacing width and a diameter of about several mm are provided in the lower portion of the side surface 13b facing the negative pressure chamber 40 in the horizontal direction. Further, these oil discharge holes 13d may use through holes inclined so as to descend toward the outside in order to improve the oil discharge property.

Further, in addition to providing the oil discharge hole 13d on the side surface 13b, it may be provided downward at a position facing the negative pressure chamber 40 on the horizontal surface 13c. The negative pressure chamber 40 and the positive pressure chamber 41 communicate with each other through these oil discharge holes 13d.

Further, the size of the diameter and the arrangement interval of the oil discharge hole 13d can be adjusted according to the amount of air passing through the first sub-collection portion 51. For example, in FIG. 4, since the airflow K2 flowing horizontally in the positive pressure chamber 41 hits the back wall of the partition plate 13 and heads upward, the amount of the airflow K2 passing by the downstream back wall side is larger. Become. Therefore, the size of the oil discharge hole 13d on the downstream side of the airflow K2 may be larger than that of the oil discharge hole 13d on the upstream side, or the arrangement interval between the oil discharge holes 13d on the downstream side may be narrower than that on the upstream side. It is preferable to do so.

The second sub-collecting unit 52 is composed of two parallel baffle plates 52a and 52b, and as shown in FIG. 5, a large number of vertical slits 52c are arranged at equal intervals in each of the baffle plates 52a and 52b. There is. The baffle plates 52a and 52b having the same shape have vertical slits 52c on the left and right so that the vertical strips 52d between the vertical slits 52c of the baffle plate 52b on the downstream side can be seen through the vertical slits 52c of the baffle plate 52a on the upstream side. They are arranged one by one.

Further, on the side surface 13e of the partition plate 13 that separates the negative pressure chamber 40 and the positive pressure chamber 41 of the second sub-collection portion 52, a plurality of oil discharge holes 13f having a diameter of about 3 mm have a predetermined spacing width. It is provided along between the baffle plates 52a and 52b. The hole diameter of the oil discharge hole 13f on the inner side where the amount of air through which the airflow K2 passes is large may be larger than the oil discharge hole 13f on the outer side.

In the second sub-collecting unit 52, the number of baffle plates 52a and 52b can be further stacked within a range that does not hinder the discharge amount of the oil mist collecting device. Further, instead of the pair of baffle plates 52a and 52b, a filter material made of a non-woven fabric or the like may be arranged.

When the drive unit 22 is driven during the operation of the oil mist collection device, the collection board 31 and the rotary fan unit 32 start high-speed rotation via the rotation shaft 33. Then, due to the pressure difference generated by the rotation of the rotary fan portion 32, the gas containing the oil content becomes an air flow K1 in the box body portion 10 from the intake port 11 and is sucked from above to below as shown by the arrow. Then, it goes from the front surface to the rear surface of the main collection unit 30.

When the airflow K1 containing the oil content passes through the collection board 31 rotating at a speed of, for example, 3000 rpm, the oil content in the airflow K1 that collides with the main collection filter 35 adheres to the main collection filter 35. Is collected. Then, the airflow K1 that has passed through the collection board 31 becomes the airflow K2 indicated by the arrow due to the rotation of the rotary fan unit 32, passes through the passage by the partition plate 13, and heads for the sub-collection unit 50.

Among the arrows in the figure, the black arrow indicates the airflow K1 containing the oil mist sucked from the intake port 11, and the white arrow indicates the airflow K2 in which the oil component is collected and removed by the main collecting unit 30. , This airflow K2 contains oil that could not be collected by the main collection unit 30.

The airflow K2 heading upward due to the rotation of the rotary fan unit 32 changes its direction horizontally and passes through the second sub-collection unit 52 of the sub-collection unit 50. In this process, as shown in FIG. 6, the airflow K2 that has passed through the vertical slit 52c of the baffle plate 52a on the upstream side collides with the vertical strip 52d of the baffle plate 52b on the downstream side. Due to this collision, the velocity of the airflow K2 decreases, and a part of the oil contained in the airflow K2 adheres to the vertical strips 52d, and this oil content is transmitted through the vertical strips 52d to reach the lower oil discharge hole 13f. .. Then, due to the pressure difference between the positive pressure chamber 41 and the negative pressure chamber 40 and gravity, the oil component is pushed out from the oil discharge hole 13f into the negative pressure chamber 40 as shown in the direction of the arrow in FIG. 4, and the bottom plate 16 Fall into.

In this way, the horizontal airflow K2 that has passed through the second sub-collection section 52 further changes its direction upward and heads toward the first sub-collection section 51. The airflow K2 passes through the wire mesh 19, the oil content is collected by the filter material of the first sub-collection portion 51, and the airflow K2 from which the oil content has been removed is discharged to the outside of the box body portion 10 from the upper exhaust port 12. Ru. The oil collected in the first sub-collecting section 51 is collected from the oil discharge hole 13d through the negative pressure chamber as shown in the direction of the arrow in FIG. 4 due to the pressure difference between the positive pressure chamber 41 and the negative pressure chamber 40. It is pushed into 40 and falls on the lower bottom plate 16.

In the process of the air flow K2 passing through the first and second sub-collecting portions 51 and 52, a slight air flow flowing from the positive pressure chamber 41 to the negative pressure chamber 40 is generated in the oil discharge holes 13d and 13f, but the oil is discharged. Since the hole diameters of the holes 13d and 13f are about several mm, they are insignificant compared to the intake / exhaust amount of the box body portion 10, and do not reduce the oil collection efficiency of the oil mist collecting device.

In order to improve the oil discharge property, it is possible to provide an inclination on the side surface 13e so that the oil faces the oil discharge hole 13f.

As the operating time of the oil mist collecting device elapses, dust and the like are accumulated in the filter material of the first sub-collecting unit 51 in addition to the oil component, so that it is necessary to periodically clean and replace the filter material. However, as compared with the conventional filter unit, the residual oil content is small and the exhaust efficiency is not significantly reduced, so that it can be operated for a long period of time without requiring maintenance.

As described above, according to the oil mist collecting device of the present embodiment, by providing the oil discharge holes 13d and 13f on the side surface of the partition plate 13 on the side of the sub-collecting unit 50, the main collecting unit 30 collects the oil mist. The oil content that could not be completely collected is collected by the sub-collecting unit 50, and the oil content collected by the sub-collecting unit 50 is collected in the positive pressure chamber by using the pressure difference between the positive pressure chamber 41 and the negative pressure chamber 40. It can be discharged from 41 to the negative pressure chamber 40.

10 Box body 11 Intake port 12 Exhaust port 13 Partition plate 13b, 13e Side surface 13d, 13f Oil discharge hole 30 Main collection section 32 Rotating fan section 35 Main collection filter 40 Negative pressure chamber 41 Positive pressure chamber 50 Sub-collection section 51 First sub-collection part 52 Second sub-collection part 52a, 52b Baffle plate 52c Vertical slit 52d Vertical strip K1, K2 Airflow

Claims (8)

Inside the sealed box body equipped with an intake port and an exhaust port, the rotating fan part is rotated to generate an air flow, and the main collection part that collects oil by the main collection filter and the main collection part. An oil mist collecting device that has an auxiliary collecting part that collects oil that could not be collected by the part, and a partition plate that is partitioned so that the airflow circulates and passes through a predetermined passage. There,
An oil discharge hole is provided on the side surface of the partition plate on the side of the sub-collection portion.
The oil discharge holes are a negative pressure chamber on the upstream side of the main collection portion and communicating with the intake port in the passage, and a positive pressure chamber on the downstream side of the main collection portion and communicating with the exhaust port. An oil mist collecting device characterized by being a hole for communicating with each other. Claim 1 is characterized in that the airflow generated from below to above is discharged to the outside of the box body portion through the exhaust port, and the sub-collection portion is horizontally arranged at the exhaust port. The oil mist collector described in. The oil according to claim 2, wherein the oil discharge hole is inclined and penetrates the partition plate along the vertical direction so as to descend horizontally or outward. Mist collector. The oil according to any one of claims 2 or 3, wherein a plurality of the oil discharge holes are provided on the side surface of the partition plate on the side of the sub-collecting portion with a predetermined spacing width. Mist collecting device. The oil mist collecting device according to claim 4, wherein the size of the diameter of the oil discharge holes or the arrangement interval of the oil discharge holes is adjusted according to the amount of air passing through the air flow. The oil mist collecting device according to any one of claims 2 to 5, wherein the sub-collecting portion is a planar filter member made of a non-woven fabric. The sub-collection section includes a first sub-collection section arranged horizontally at the exhaust port and a second sub-collection section arranged on the upstream side of the first sub-collection section.
The second sub-collection section is a pair of parallel baffle plates.
The oil mist collecting device according to any one of claims 2 to 6, wherein the baffle plate has a large number of vertical slits arranged at equal intervals. The second sub-collecting portion has the baffle plate so that when viewed from the front, the vertical strips between the vertical slits of the baffle plate on the upstream side and the vertical slits of the baffle plate on the downstream side can be seen. The oil mist collecting device according to claim 7, wherein the oil mist is arranged in a staggered manner.

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