JPH0673609B2 - Oil mist removal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mist removing device using a fan device provided with a function for generating an axial flow in a centrifugal fan.

[0002]

2. Description of the Related Art As an oil mist removing device, Japanese Utility Model Publication No. 58-11373 has been conventionally known. The conventional oil mist removing device, including the Japanese Utility Model Publication No. 58-11373, is, in principle, an oil mist removing wind in which gas containing oil mist is forced to flow from a suction part to an exhaust part by a fan. A filter is arranged so as to separate the leeward side and the leeward side in the road, and when gas containing oil mist passes through the filter, the oil mist in the gas is captured by the filter to remove the oil mist. Was doing.

[0003]

However, in the above-mentioned conventional example, the filter is gradually replaced as the filter is replaced because the filter gradually becomes clogged to reduce the air volume and the oil mist capturing ability. There is a problem that has to be. Further, since the filter is gradually clogged as described above, the oil mist trapping efficiency also gradually changes (gradually decreases), and there is a problem that the oil mist trapping efficiency cannot be made constant. Further, when the filters are arranged in multiple stages, there is a problem that the air volume is reduced, and even if the filters are arranged in multiple stages, the efficiency of capturing the oyster mist is poor.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to efficiently increase the air volume and to reduce the fan mist of an oil mist. When the gas containing gas passes through, it separates the oil mist and the gas, and changes the main outflow direction when the separated oil mist and the gas leave the fan to collide the oil mist with the inner wall of the casing and separate the gas. The present invention provides an oil mist removing device that can efficiently send the oil mist to the next fan and efficiently catch the oil mist one after another.

[0005]

In order to solve the problems of the above-mentioned conventional examples and achieve the object of the present invention, the oil mist removing device of the present invention has a suction part 2 and an exhaust part 3 in a casing 9. The oil mist removing air passage 1 is formed, the motor shaft 10 is inserted into the casing 9, and the ring-shaped plate portion 14 having the opening 15 at the center is provided in front of the disk portion 13 fixed to the motor shaft 10. A plurality of blade portions 16 bent in a V shape in a front view are provided between the ring-shaped plate portion 14 and the disk portion 13 facing each other, and the bent portion 1 of the blade portion 16 bent in a V shape.
6a, the outer portion 16b of the blade portion 16 protruding outward from the outer peripheral end of the disc portion 13 and bent in the V-shape.
The outer portion 16b of the bent portion 16a is twisted with respect to the inner portion 16c of the bent portion 16a so that the front end and the rear end of the outer portion 16b of the bent portion 16a are displaced with respect to the rotation direction. To form a fan 4, a plurality of the fans 4 are attached to the motor shaft 10 in the casing 9, and the gas blown by the fans 4 is placed between the fans 4 and the ring-shaped plate portion 14 of the fan 4 of the next stage. The guide vane body 12 for introducing into the opening 15 at the center of the above is provided, and by adopting such a configuration, the problems of the above-mentioned conventional example are solved. This has been solved to achieve the object of the present invention.

[0006]

When the motor shaft 10 is rotated, the plurality of fans 4 fixed to the motor shaft 10 rotate, and the gas containing the oil mist flows into the oil mist removing air passage 1 from the suction portion 2 in the casing 9 and is exhausted. It is discharged from the part 3. In this case, first, the gas containing the oil mist is sucked from the central opening 15 of the ring-shaped plate portion 14 of the first-stage fan 4 and flows along the blade portions 16. At this time, since the blade 16 is provided with the bent portion 16a, the baffle effect of the V-shaped blade 16 changes the flowing direction of the gas containing the oil mist and collides with the blade 16 to collide with the oil. Aggregates of mist are separated. The outer portion 16b of the blade portion 16 bent in a dogleg shape is projected outward from the outer peripheral end of the disk portion 13, and the bent portion of the blade portion 16 bent in a dogleg shape is formed. 16
The outer part 16b is twisted with respect to the inner part 16c than the bent part 16a so that the bent part 16a is rotated in the rotational direction.
Since the front end 16d and the rear end 16e of the outer portion 16b are inclined so that they are displaced from each other, the aggregate of oil mist that is heavier than gas is blown toward the outer peripheral direction of the fan 4 by the centrifugal force of the fan 4, The gas from which the mist aggregates are separated is twisted and inclined, and the outer portion 16 of the blade 16 is inclined.
It is guided by b and sent to the rear or diagonally rearward, whereby the main outflow direction when the separated oil mist and gas exit from the fan 4 is changed, and the outer peripheral direction of the fan 4 is caused by centrifugal force. The agglomerates of the oil mist that have been blown off are collided with the inner wall of the casing 9 and captured.
On the other hand, the gas sent rearward or obliquely rearward is guided by the guide vane body 12 and is guided to the ring-shaped plate portion 14 of the second stage fan 4.
Is introduced through the opening 15 at the center of the. In this case, the gas sent by changing the direction to the rear or obliquely rearward by the first-stage fan 4 is blown outward by the centrifugal force of the first-stage fan 4 and captured by the inner wall of the casing 9. The aggregate of oil mist is not blown off and flowed to the fan 4 side of the second and subsequent stages. The fan 4 in the second and subsequent stages also separates the oil mist and the gas in the same manner as described above, and the aggregate of the oil mist is blown outward by the centrifugal force to be trapped on the inner wall of the casing 9, and the separated gas is rearward or It is to be slanted backward. In this way, the oil mist can be efficiently captured by the fans 4 arranged in multiple stages in the casing 9 without using a filter as in the conventional case.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. The oil mist removing device 8 is shown in FIGS. 1 and 2. The suction portion 2 is provided at one end of the casing 9 of the outer shell of the oil mist removing device 8, and the casing 9
An exhaust part 3 is provided at the other end of the oil mist removing air passage 1 from the suction part 2 to the exhaust part 3 in the casing 9. A motor shaft 10 rotated by a motor 11 is inserted into the casing 9, a plurality of fans 4 are fixed to the motor shaft 10, and guide vanes 12 are provided between the fans 4 and 4. . Here, as the fan 4 used in the oil mist removing device 8, a fan 4 as shown below is used.

As shown in FIGS. 6 and 7, a fan 4 has a disk portion 13 fixed to a motor shaft 10 and a ring-shaped plate portion 14 having an opening 15 at the center in front of the disk portion 13. Are arranged so as to face each other, and a plurality of blade portions 16 bent in a V shape in a front view are provided between the ring-shaped plate portion 14 and the circular plate portion 13 so as to span. Here, in the blade portion 16 bent in a dogleg shape, the outer portion 16b is projected more outward than the outer peripheral end of the disk portion 13 than the bent portion 16a, and the blade bent in a dogleg shape. The portion 16b outside the bent portion 16a of the portion 16 is twisted with respect to the portion 16c inside the bent portion 16a, and the portion 16b outside the bent portion 16a with respect to the rotational direction.
It is inclined so that the front end 16d and the rear end 16e of b are displaced. Here, although the bent portion 16 of the blade portion 16 is a straight line and the cross section of the outer portion 16b is a straight line from the bent portion 16, the bent portion 16 has an arc shape as shown in FIGS. The cross section of the outer portion 16b may be arcuate.

In the guide vane body 12, a large-diameter rear plate 17 having a hole 19 in the center and a front plate 18 having a smaller diameter than that are arranged so as to face each other, and the guide vane part is provided between the front plate 18 and the rear plate 17. 20 is installed and constructed. As shown in FIG. 8, the guide vane portion 20 is bent in a V shape in a front view similarly to the vane portion 16 of the fan 4, but the guide vane portion 20 is not necessarily limited to being bent in a V shape as described above. . Here, the casing 9 is configured by connecting a plurality of divided casing bodies 21,
The flange portions 22 of the divided casing bodies 21 are joined together by bolts and nuts. In this case, the guide vane body 12 is mounted in the casing 9 at the same time when the divided casing bodies 21 are connected by sandwiching the outer peripheral end portion of the rear plate 17 of the guide vane body 12 between the flange portions 22. The hole 19 at the center of the rear plate 17 faces the opening 15 of the ring-shaped plate 14 of the fan 4 adjacent to the rear side. Then, by sandwiching the outer peripheral end of the rear plate 17 of the guide blade 12 between the flanges 22 in this manner, the gas flowing rearward from the outer periphery of the fan 4 is transferred to the guide blade 20 of the guide blade 12. From the gap between the outer ends to the inside of the guide blade portion 20, the hole portion 19
It comes out of and flows into the opening 15 of the next fan 4 adjacent to the rear side.

The inner peripheral wall 24 of the casing 9 serves as an oil mist trapping portion 7 against which agglomerates of oil mist blown out in the outer peripheral direction of the fan 4 by the centrifugal force of the fan 4 collide. As shown in FIG. 9, a spiral oil discharge groove 25 is formed on the inner surface of the inner peripheral wall 24 of the casing 9 serving as the oil mist trapping portion 7, and the spiral oil discharge groove 25 is formed.
The end of the ring 9 communicates with an annular groove 25a provided over the entire inner circumference of the casing 9, and a discharge hole 26 is provided at the lowermost end of the annular groove 25a so as to penetrate the casing 9. That is,
The oil mist captured by the oil mist capturing section 7 is transmitted through the spiral oil discharge groove 25 and discharged to the outside from the discharge hole 26 via the annular groove 25a.

In the embodiment shown in FIG. 3 as an overall view, the oil mist removing device 8 having the above-mentioned structure is internally provided in a box 27 as shown in FIGS. Box 27 is base 40
The oil mist removing device 8 is fixed to the base 40. In this case, the motor 11 is also attached to the base 40.
It is fixed to. The base 40 is provided with a dish 41 so that the oil from the discharge hole 26 can flow into the dish 41. The plate portion 41 is provided with an oil drain hole 42. The box 27 is divided into a front chamber 28, an oil mist removing device storage chamber 29, and a rear chamber 30.
The suction port 31 is provided in the. A detachable window portion 32 is provided on a side portion of the box 27, and the window portion 32 of the front chamber 28 is provided.
The suction portion 2 of the oil mist removing device 8 is opened at a position facing the suction pipe 2, and the support cylinder 33 communicating with the suction portion 2 is provided.
Are projected into the front chamber 28. Then, the window portion 32 is removed, and a cylindrical thick filter 34 is inserted into the front chamber 28 from the side hole of the box 27, and the rear end portion of the cylindrical thick filter 34 is attached to the support cylinder 33. It is fitted in and attached to. Therefore, the gas containing the oil mist sucked from the suction port 31 enters the front chamber 28, passes through the thick filter 34, and flows into the suction portion 2 of the oil mist removing device 8. The exhaust part 3 of the oil mist removing device 8 is provided at the upper part of the rear part of the casing 9 and communicates with the upper part of the rear chamber 30. Back room 30
As shown in FIG. 10, two partitions 3 are provided by the partition 35.
It is divided into 0a and 30b, and the lower side of the partition 35 is opened to communicate the two rooms 30a and 30b. A box 27 is provided on the upper side of the room 30b where the exhaust unit 3 is not provided.
The exhaust port 36 is formed. In other words, the gas flowing out from the exhaust unit 3 into the room 30a hits the cushioning material 44 such as the non-woven fabric provided in the room 30a and flows downward, flows through the opening below the partition 35, rises in the room 30b and rises from the exhaust port 36. It is exhausted, but in this case, the gas is made to meander in a U shape, preventing the re-scattering of the oil mist, and
The sound is silenced by passing through the rear chamber 30.
Further, the oil that hits the cushioning material 44 and is prevented from re-scattering is discharged from the outlet 45 to the outside.

Thus, the oil mist removing device 8 of the present invention having the above-mentioned structure captures the oil mist generated from the lathe or grinder that is the oil mist generating source. , The motor 11 is driven to rotate the motor shaft 10, and the plurality of fans 4 fixed to the motor shaft 10 are rotated. When the fan 4 is rotated, the gas containing the oil mist becomes a hood (not shown),
The front chamber 28 from the suction port 31 through a duct (not shown)
The dust that is sucked into the inside and is contained in the gas by the thick filter 34, or dust such as grinding abrasive powder is captured. In this case, part of the oil mist is captured by the thick filter 34. The gas containing the oil mist that has passed through the thick filter 34 passes through the oil mist removing air passage 1 from the suction portion 2 of the oil mist removing device 8 and is separated when passing through the oil mist removing air passage 1. The gas is captured and flows from the exhaust unit 3 to the rear chamber 30, and is exhausted to the outside through the rear chamber 30 and the exhaust port 36. In FIGS. 4 and 5, the flow of gas is indicated by arrows. As shown in FIGS. 1 and 2, the same centrifugal type fan 4'as the conventional one is used as the final stage fan.

Here, the oil mist is removed by the oil mist removing device 8 as follows. That is, when the fan 4 is rotated, the gas flows through the opening 15 of the first-stage fan 4 and passes through the gap between the gas foil-shaped blade portions 16 to form a dogleg shape. The oil mist collides with the blades 16 to aggregate the oil mist, and the aggregated substance with the oil mist is aggregated to a large diameter by the centrifugal force due to the rotational force of the fan 4 to increase the mass, and the first-stage divided casing body 21 The oil mist agglomerates are separated and captured in the first stage by colliding with the inner peripheral wall 24. On the other hand, the bent portion 1 of the blade 16 bent in a dogleg shape
6a, the outer portion 16b of the blade portion 16 protruding outward from the outer peripheral end of the disc portion 13 and bent in the V-shape.
Of the bent portion 16a, the outer portion 16b
Since the front end 16d and the rear end 16e of the outer portion 16b are twisted with respect to the rotation direction by twisting with respect to the inner portion 16c with respect to a, the gas is converted into gas as described above. The heavier oil mist agglomerates are blown by the centrifugal force of the fan 4 in the outer peripheral direction of the fan 4 (direction of arrow A in FIG. 1) and collide with the oil mist trapping portion 7 which is the inner peripheral wall 24 of the divided casing body 21. Captured,
The gas from which the oil mist aggregates have been separated is guided by the outer portion 16b of the blade portion 16 which is twisted and inclined, and flows rearward (in the direction of arrow B in FIG. 1, that is, in the axial direction of the motor shaft 10) or obliquely rearward, It passes between the guide blades 20 of the guide blade 12 and flows into the opening 15 of the next fan 4. The gas that has flowed into the opening 15 of the next fan 4 contains some of the oil mist without being separated.
When the oil mist aggregates are passed through the second direction by the centrifugal force of the fan 4 as in the operation of the first fan 4 described above.
The collision with the inner peripheral wall 24 of the divided casing body 21 at the second stage is performed to separate and capture the oil mist aggregates in the second stage, while the gas is outside the bent portion 16a of the fan 4 and is outside the portion 16a.
The guide vane 1 is guided by the inclined surface of b and sent to the rear.
It passes between the two guide vanes 20 and flows into the opening 15 of the next fan 4. Similarly, the oil mist in the gas is separated and captured from the gas one after another. In this way, the oil mist removing device 8 is repeated while repeating the same thing one after another.
The oil mist in the gas is removed by passing through the oil mist removing air passage 1. The oil mist captured by the oil mist capturing portion 7, which is the inner peripheral wall 24 of the casing 9, flows along the spiral oil exhaust groove 25 toward the exhaust hole 26 side by wind pressure, and from the exhaust hole 26 to the base 40.
It is discharged to the side of the plate portion 41 provided in the.

Here, in the present invention, the outer portion 16b of the blade portion 16 bent in a dogleg shape is protruded outward from the outer peripheral end of the disc portion 13 and is formed into a dogleg shape. Of the bent blade portion 16, the outer portion 16b of the bent portion 16a is twisted with respect to the inner portion 16c of the bent portion 16a, and the front end 16d and the rear end of the outer portion 16b of the bent portion 16a are rotated in the rotational direction. Since it is inclined so that it is displaced from 16e, when it goes out from the fan 4, the aggregate of oil mist that is heavier than the gas is blown toward the outer peripheral direction of the fan 4 by the centrifugal force of the fan 4, but The gas from which the agglomerates have been separated twists and tilts the blade portion 1
6 is guided by the outer portion 16b of 6 to be sent obliquely rearward, whereby the main outflow direction when the separated oil mist and gas exit the fan 4 is changed, and the oil mist is efficiently captured. As a result, it is not necessary to provide a film filter in the oil mist removing air passage 1 as in the conventional case, and the oil mist is not required to be coagulated and expanded there. It will be greatly improved.

[0015]

According to the present invention, as described above, an oil mist removing air passage extending to the suction portion and the exhaust portion is formed in the casing, and the motor shaft is inserted into the casing and fixed to the motor shaft. A ring-shaped plate with an opening in the center is placed in front of the disc, and a plurality of blades bent in a V shape in front view are installed between the ring-shaped plate and the disc. Then
The outer side portion of the blade portion bent in a dogleg shape is protruded outward from the outer peripheral end of the disk portion, and the outer portion of the blade portion bent in a dogleg shape is bent from the bent portion. Also twists with respect to the inner part and inclines so that the front end and the rear end of the outer part deviate from the bent part with respect to the rotational direction to form a fan, and a plurality of such fans are attached to the motor shaft in the casing. A guide vane body is provided between the fans to introduce the gas blown by the fans into the opening at the center of the ring-shaped plate of the next stage fan. Gas containing oil mist is sucked from the central opening of the plate and flows along the blades.At this time, due to the baffle effect of the V-shaped blades, the direction in which the gas containing oil mist flows is changed. Colliding with the blade while being changed Not only the aggregate of oil mist is separated from the gas, but also the portion outside the bent portion of the blade portion bent in a dogleg shape is projected outward from the outer peripheral end of the disc portion and the dogleg shape is formed. Of the bent blade portion, the portion outside the bent portion is twisted with respect to the portion inside the bent portion and inclined so that the front end and the rear end of the portion outside the bent portion are displaced with respect to the rotation direction. Therefore, the aggregate of oil mist, which is heavier than gas, is blown toward the outer peripheral direction of the fan by the centrifugal force of the fan and captured on the inner wall of the casing, but the gas from which the aggregate of oil mist is separated twists. It is guided by the outer part of the inclined blade part and sent to the rear, which changes the main outflow direction when the separated oil mist and gas exit the fan, and efficiently separates the oil mist. And capture In addition to being able to replace the filter as in the conventional case, the oil mist can be trapped stably in a constant state, and the separation and trapping are performed in multiple stages in the casing. As a result, the oil mist contained in the gas can be efficiently separated and trapped on the inner wall of the casing.Also, even if the oil mist is arranged in multiple stages, the above-mentioned separation and trapping is performed by a multi-stage fan, further reducing the air volume. Without doing so, the oil mist capturing efficiency is further improved.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an oil mist removing device.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 is an overall perspective view of the above.

FIG. 4 is a side sectional view of the above.

FIG. 5 is a plan sectional view of the above.

FIG. 6 is a perspective view of a fan used in the above.

FIG. 7 is a front view of the above.

FIG. 8 is a front sectional view of the guide vane body of the above.

FIG. 9 is a schematic perspective view for explaining an oil discharge groove of the above divided casing body.

10A and 10B are a plan view and a front view showing a rear chamber portion.

FIG. 11 is a perspective view of another embodiment of the fan used in the above.

12 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Oil mist removal air passage 2 Suction part 3 Exhaust part 4 Fan 9 Casing 10 Motor shaft 12 Guide vane body 13 Disc part 14 Ring-shaped plate part 15 Opening part 16 Vane part 16a Bending part 16b Outer part 16c Inner part 16d Front end 16e Rear end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mizuro Edamura 1-20-19 Shimanouchi, Chuo-ku, Osaka-shi, Osaka Craco Co., Ltd. (56) References JP-A-4-4013 (JP, A)

Claims (1)

[Claims] 1. An oil mist removing air passage extending to a suction portion and an exhaust portion is formed in a casing, a motor shaft is inserted in the casing, and a central portion has an opening portion in front of a disk portion fixed to the motor shaft. The opposite ring-shaped plate parts are arranged to face each other, and a plurality of blade parts that are bent in a V shape when viewed from the front are installed between the ring-shaped plate part and the circular plate part. The outer portion of the blade portion protruding outward from the outer peripheral edge of the disc portion, and the outer portion of the blade portion bent in a dogleg shape twisted with respect to the inner portion of the bent portion. A fan is constructed by inclining the front end and the rear end of the outer side portion with respect to the rotation direction so as to deviate from each other, and a plurality of the fans are attached to the motor shaft in the casing. The blown gas is transferred to the center of the ring-shaped plate of the next stage fan. An oil mist removing device, characterized in that a guide vane body for introducing into the opening is provided.