JP2951860B2 - 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 a mist-containing air sucked into a separation chamber by rotation of an electric fan unit, and discharges clean air from a discharge filter mounted on a discharge opening of a casing surrounding the separation chamber. More particularly, the present invention relates to an oil mist removing device that recovers oil dripping when a filter element of a discharge-side filter is saturated.

[0002]

2. Description of the Related Art In an oil mist removing apparatus disclosed in Japanese Utility Model Publication No. 56-20026, mist-containing air is supplied from an intake duct to an expansion chamber having a flow path cross-sectional area larger than the flow path cross-sectional area of the suction duct by rotation of an electric fan unit. , The mist-containing air is rapidly expanded and turbulent in the expansion chamber. Then, a part of the turbulent mist-containing air flows backward and collides with the inner wall surface of the expansion chamber, whereby the oil mist is turned into oil droplets. The oil that has been turned into oil droplets is discharged from the oil guide pipe to the outside through the oil drain pipe on the separation chamber side. Further, the mist-containing air that has passed through the wire mesh arranged for removing chips and the like sucked into the separation chamber from the expansion chamber is
In the separation chamber, the flow surface radially spreads in a direction orthogonal to the rotation axis of the electric motor and passes through a rotation filter mounted on the rotation shaft, so that oil mist is turned into oil droplets in the rotation filter. Then, the oil formed into oil droplets in the rotary filter is blown to the inner wall surface of the casing by centrifugal force, and is discharged to the outside from the oil drain pipe. Furthermore, since the mist-containing air passes through the first and second auxiliary filters provided as the discharge-side filters, only the purified air is discharged to the outside. The oil formed by the first and second auxiliary filters is discharged to the outside through a drain pipe on the separation chamber side.

In the oil mist removing device disclosed in Japanese Patent Application Laid-Open No. 4-4013, a plurality of centrifugal impellers are arranged at intervals on a rotating shaft of an electric motor, and fixed impellers are individually provided between these centrifugal impellers. An electric fan unit provided with a separation chamber having a disposed structure is provided in a box. Also,
The blades and vanes of each impeller are bent from the outside in the radial direction to a shape having a substantially U-shape, and a spiral oil discharge groove is formed on the inner peripheral wall surface of the casing that supports the fixed impeller. . And the conventional oil mist removal device having such a structure, the mist-containing air sucked into the separation chamber from the suction duct by the rotation of the electric fan unit,
The oil spreads radially perpendicular to the rotation axis of the motor by the centrifugal impeller and collides with the inner peripheral wall surface of the casing before passing through the fixed impeller. Is blown to the inner peripheral wall surface of the casing by centrifugal force, passes through a spiral groove of the wall surface, and is discharged into the box body through an oil drain port formed in a flange portion of the casing that is radially outside the fixed impeller. You.

[0004]

[Problems to be Solved by the Invention]
The oil mist removing device disclosed in Japanese Patent Application Laid-Open Publication No. 6-26106 discloses a first auxiliary filter in which three nonwoven fabric filters are stacked and held by a wire mesh, and the mist-containing air sucked into the separation chamber by the rotation of the sirocco fan of the electric fan unit. The structure is such that oil mist is completely captured by being discharged to the outside through a discharge side filter comprising a second auxiliary filter filled with aluminum lath behind the nonwoven fabric filter. However, when the filter elements of these discharge-side filters become saturated, the oil trapped by the second auxiliary filter and formed into oil droplets is discharged from the second auxiliary filter by the wind pressure of the sirocco fan of the electric fan unit. It is thought that it drips and scatters.

In the oil mist removing device disclosed in Japanese Patent Application Laid-Open No. 4-4013, two chambers are provided in the flow path from the separation chamber to the discharge port of the box body, and the mist-containing air is supplied to the non-woven fabric filter element in the front chamber. After flowing into the rear chamber through the lower part of the partition, the air flows upward to the discharge port on the rear chamber side and is discharged, and the mist-containing air is discharged while meandering in a U-shape in the partition. Therefore, it is considered that the oil mist formed into oil droplets does not scatter, and even if the nonwoven fabric filter element becomes saturated, the trapped oil does not scatter outside. However,
If the structure is such that the mist-containing air meanders on the discharge side, the device becomes large and cannot be provided at low cost. SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive oil mist removing device that can prevent contamination of a device or a device installation place by oil dripping or scattered from a discharge-side filter by adopting a simple structure.

[0006]

In order to achieve such an object, an oil mist removing device according to the present invention comprises
As an invention, an oil mist removing device that sucks mist-containing air into a separation chamber by rotation of an electric fan unit and discharges clean air from a discharge-side filter attached to a discharge opening of a casing surrounding the separation chamber. When the filter element of the discharge-side filter is saturated in the opening, the air is discharged by the wind pressure of the electric fan unit.
An oil droplet collecting member that receives oil that seeps out and drips to the outside of the outlet filter is provided.
It is characterized by being installed .

According to a second aspect of the present invention, in the oil mist removing device of the first aspect, the discharge-side filter comprises: an inner discharge-side filter through which mist-containing air discharged from a discharge opening of the casing flows; and an inner discharge-side filter. The inner filter on the outer side and the outer filter on the outer side are installed in the oil droplet collecting member, so that the filter on the discharge side is attached to the discharge opening. Features.

According to a third aspect of the present invention, in the oil mist removing device of the second aspect of the present invention, the oil droplet collecting member includes a first installation surface of the inner discharge side filter and an outer discharge side filter having a surface height higher than the first installation surface. A second installation surface is provided, and when each filter element becomes saturated on each of the first installation surface and the second installation surface, each discharge side is driven by wind pressure of the electric fan unit.
An oil droplet gutter having a concave shape for receiving oil dripping out of the filter is formed individually.

[0009]

The mist-containing air sucked into the separation chamber by the rotation of the electric fan unit is converted into oil mist by centrifugal separation. The mist-containing air having a small mist content is discharged to the outside as purified air in which the oil mist is captured by the discharge-side filter. Further, when the filter element of the discharge-side filter is saturated , the captured oil mist is turned into oil droplets by the wind pressure of the electric fan unit, soaks out of the discharge-side filter, and drops on the oil droplet collecting member (first). invention).

The oil mist that has passed without being caught by the inner discharge filter is caught by the outer discharge filter (second invention). Furthermore, the installation surface of the outer discharge side filter is set higher than the installation surface of the inner discharge side filter installed on the oil droplet accumulation member, and a concave oil gutter portion is provided on each installation surface.
Since it is provided, the oil formed into oil droplets from the inner discharge side filter does not permeate the outer discharge side filter (third invention).

[0011]

1 is a front view of an oil mist removing apparatus according to one embodiment of the present invention, FIG. 2 is a left side view of FIG. 1, and FIG.
, FIG. 4 is a left side view in which the discharge-side filter is omitted and a part of the filter is omitted, FIG. 5 is a front view of a centrifugal impeller mounted on the rotating shaft of the electric motor, and FIG. 6 is a cross-sectional view of the discharge-side filter. FIG. 7 is a plan view of a main part showing the valve means. FIG. 8 is a sectional view of only a main part of a discharge filter according to another embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to these drawings.

The oil mist removing device 1 is for purifying air by sucking mist-containing air around the machine tool and separating the oil mist, and comprises an electric motor 2 and a fan unit 3 mounted on the electric motor 2. It has an electric fan unit 4. A centrifugal impeller 7 having a plurality of rotor blades 7 a on a hub 6 (three in the embodiment) mounted by being screwed at intervals in the axial direction on a rotating shaft 5 of the electric motor 2.
Are individually screwed and fixed. Further, between the centrifugal impellers 7, the rear casing 8 directly fixed to the electric motor 2 and having the discharge cylinder 8 a formed therebetween and the center casing 9 fitted and fixed to the rear casing 8 are sandwiched and fixed. Fixed impeller 10 having a stationary vane 10a, a center casing 9 and the center casing 9
Vane 1 fitted and fixed to the front casing 11 and fixed to the front casing 11 formed with the suction port 11a.
A fixed impeller 12 having 2a is configured. The space in the fan unit 3 surrounded by the casings 8, 9, and 11 is a separation chamber 13.

The front casing 1 of the fan unit 3
A rear housing 14 and a front housing 15 are sequentially fitted and fixed to the front side of the housing 1, and a space surrounded by the housings 14 and 15 is an expansion chamber 16. The rear housing 1 is provided in the expansion chamber 16.
A wire net-shaped suction-side filter 17 sandwiched and fixed by the front housing 4 and the front housing 15 is provided. Reference numeral 18 denotes a cylindrical housing fixed to the front of the front housing 15.
From 8 a, mist-containing air is sucked into the expansion chamber 16.

The oil mist removing device 1 having such a structure is provided with the casings 8, 9 and 9 of the fan unit 3.
A box-shaped pedestal member 19 for recovering oil discharged from oil drain ports 11b and 14a (casings 8.9 and 9 are not shown) formed in the lowermost portion of the rear housing 11 and 11; With the leg member 20 fixed to the pedestal member 19, it is installed on a machine tool, for example. The code 1
9a is an oil drain pipe fitted and fixed to an oil drain port of the base member 19 (see FIG. 1).

Next, a description will be given of an oil droplet collecting member which is a feature of the present invention. The discharge cylinder 8a formed in the rear casing 8 of the fan unit 3 has a discharge port 8a (see FIG. 7) of the discharge cylinder 8a and a flow port 21a concentric with the discharge pipe 8a.
A bottomed cylindrical oil drop collecting member 21 having an oil drain port 21b to which the fitting 2 is fixed is provided. In addition, a discharge-side filter 23 is provided in the oil droplet accumulation member 21.

The discharge-side filter 23 is composed of a cylindrical first filter element 24 made of phenol-impregnated filter paper or the like bent into a mountain shape, and a nonwoven fabric filter wound two or three times outside the first filter element 24. A second filter element 25, and a cylindrical reinforcing member 26 fitted to the outside of the second filter element 25 and having a plurality of through holes formed by punching. The first filter element 24, the second filter element 25, and the reinforcing member 26 are provided via a sponge-like sealing member 27 fixed to the outside of the pair of synthetic resin material covers 24a and 24b of the element 24.
Is fitted with a pair of metal covers 28 and 29. The reinforcing member 26 and the metal cover 29 having the circulation port 29a are welded together, but the metal cover 28 is fixed to the reinforcing member 26 by a corner clamp (not shown) so as to be openable and closable. Structure.

Further, the discharge side filter 23 having such a structure is provided with valve means for adjusting the flow rate as shown in FIG. The valve means comprises a pair of adjusting plates 3
An adjusting member composed of 0.31 is fixed on a metal cover 29 so as to be adjustable. That is, each adjusting plate 30, 31 has a screw 3 screwed to the discharge cylinder 8 a of the rear casing 8.
A pair of long holes 30a and 31a through which the nozzle 2 is inserted are formed, and after adjusting the flow path cross-sectional area with respect to the discharge port 8b of the discharge cylinder 8a, the respective adjustment plates 30 and 31 are moved to the cover 29 and the oil droplet pool. Together with the member 21, it is fixed to the discharge cylinder 8a. Then, by fitting the first filter element 24 and the second filter element 25 into the reinforcing member 26 and then closing the cover 28, the structure of the discharge side filter 23 is completed.

In the oil mist removing device 1 having the above structure, the centrifugal impeller 7 is rotated by the rotation of the electric motor 2, so that the mist-containing air is sucked into the expansion chamber 16 from the suction port 18 a of the cylindrical housing 18. It is. The mist-containing air in which oil mist is partially captured in the expansion chamber 16 flows from the center of the centrifugal impeller 7 to the inner peripheral surfaces of the casings 8, 9, and 11 in the separation chamber 13. 9
11 flows toward the center of the fixed impellers 10 and 12 from the inner peripheral surface of 11. The oil mist of the mist-containing air that collides with the inner peripheral surfaces of the casings 8, 9, and 11 is converted into oil droplets and discharged into the pedestal member 19.

In the separation chamber 13, the mist-containing air having a small oil mist content is discharged from the discharge cylinder 8a of the rear casing 8 into the discharge-side filter 23, and the primary filter element of the discharge-side filter 23 24 and 2
Next, it is discharged to the outside of the apparatus while being cleaned through the filter element 25. By repeating such an operation, the secondary filter element 25 of the discharge-side filter 23 is formed.
Is saturated and oil seeps out, the oil drips on the oil droplet collecting member 21 and flows from the oil drain pipe 22 to an oil drain recovery tank or the like and is collected.

The annular oil droplet gutter 21 is formed by the cylindrical portion of the cover 29 of the discharge side filter 23 and the oil droplet collecting member 21.
c, the cover 29 'is provided with an oil discharge port 29'b, and an annular recess is formed in the outer periphery of the oil droplet accumulation member 21', as shown in FIG. By using the oil droplet gutter portion 21'c as the portion, the oil dropped on the oil droplet gutter portion 21'c by the wind pressure of the electric fan unit 4 does not scatter outside at all. Further, an oil droplet accumulation portion is formed integrally with the discharge cylinder 8a of the rear casing 8, and the oil droplet accumulation portion and the cover 2 of the discharge side filter 23 are formed.
If an oil drop gutter is provided according to 9, the device can be provided at lower cost by reducing the number of parts.

Next, another embodiment of the present invention will be described.
FIG. 9 is a sectional view of the discharge-side filter. The structure of the main body of the oil mist removing device is the same as that of the oil mist removing device 1 described above, and therefore the description is omitted. In addition, since the filter configured as the inner discharge filter has the same structure as the discharge filter 23 described above, detailed description is omitted by using the same reference numerals.

The discharge-side filter 33 shown in the figure comprises an oil-drop collecting member 34 screwed and fixed to the discharge cylinder 8a of the rear casing 8 together with the cover 29 of the inner discharge-side filter 23.
It is installed and fixed. The oil droplet accumulation member 34 includes a concave portion 34c in which a flow port 34a and an oil drain port 34b are formed,
A flat portion 34d extending outward from an upper end of the peripheral wall portion of the concave portion 34c, and an outer peripheral portion of the flat portion 34d,
And an annular concave portion 34e in which an oil drain port 34f is formed.
The recess 34e is provided as an oil gutter for the outside discharge side filter 36 described later. Oil drain pipes 22 and 35 are fitted and fixed to the oil drain ports 34b and 34f of the recesses 34c and 34e.

The outer discharge side filter 36 has a cylindrical third filter element 37 formed by sandwiching a fume trapping filter material with a wire mesh reinforcing member and bending it into a mountain shape, and a plurality of through holes formed by punching. A cylindrical reinforcing member 38 pierced and fitted to the third filter element 37
And And these third filter elements 3
7 and a pair of metal covers 39a and 39 of the reinforcing member 38
b, a sponge-like sealing member 40 is fixed, and the third filter element 37 and the reinforcing member 38 installed on the flat portion 34d of the oil droplet accumulation member 34 via these sealing members 40 are made of metal. A dish-shaped cover 41 made of material and a cylindrical cover 42 made of metal material welded to the cover 41 and having a large number of through holes are fitted. In addition, a corner clamp (not shown) is attached to the cylindrical cover 42, and is configured to be detachably fixed to the oil droplet collecting member 34.

The oil mist removing device to which the discharge-side filter 33 having such a structure is mounted is driven in the same manner as the oil mist removing device 1 described above to convert the mist-containing air into clean air. Also, the filter elements 25 and 37
The oil that has become saturated is dripped into the concave portions 34c and 34e of the oil droplet accumulation member 34 and collected from the oil drain pipes 22 and 35 into an oil drain tank (not shown). Furthermore, the installation surface (first installation surface) of the inner discharge side filter 23 is changed to the concave portion 34c.
And the installation surface (the second installation surface) of the outer discharge filter 36 is a flat portion 34d, and the installation surface of the outer discharge filter 36 is set at a level higher than the installation surface of the inner discharge filter 23. Oil dripping from the side filter 23 does not permeate the outer discharge side filter 36. The small oil mist that has passed through the inner discharge side filter 23 is
Captured at 6.

In this embodiment, the valve means for adjusting the flow rate is not illustrated. However, a structure similar to that of the previous embodiment can be used. Also, the oil droplet accumulation member 34
A concave portion 34e is provided on the outermost peripheral portion of the oil droplet gutter portion, and the oil droplet gutter portion is lower than the flat portion 34d. However, the concave surface similar to the oil droplet gutter portion 21'c of FIG. A part may be provided. In addition, the oil droplet collecting member 34 is connected to the rear casing 8.
Can be formed integrally with the discharge cylinder 8a.

[0026]

As described above, in the oil mist removing device according to the present invention, since the oil droplet collecting member is provided as the first invention, the operation of cleaning and replacing the filter element of the discharge side filter is poor, and the oil seeps out. Even if it comes out, the device and the place where the device is installed will not become dirty. In addition, since a simple structure in which the oil droplet accumulation member is provided at the discharge opening of the separation chamber is employed, the oil mist removing device can be provided at low cost. According to the second aspect of the present invention, the discharge side filter has a dual structure of an inner discharge side filter and an outer discharge side filter, and is installed in the oil droplet collecting member. Even if oil seeps out, the equipment and the installation place are not contaminated. In addition, since minute oil mist that has not been captured by the inner discharge side filter can be captured by the outer discharge side filter, a higher performance device having a high oil mist capture rate can be provided.

According to a third aspect of the present invention, an oil droplet collecting member includes:
Since the first installation surface of the inner discharge-side filter and the second installation surface of the outer discharge-side filter whose surface is higher than the first installation surface are provided, the oil that seeps out of the inner discharge-side filter is applied to the outer discharge-side filter. Does not soak. In addition, since each installation surface is provided with a recessed oil droplet gutter for receiving oil dripping from the filter element, the device and the installation location of the device are not contaminated.

[Brief description of the drawings]

FIG. 1 is a front view of an oil mist removing device according to an embodiment of the present invention.

FIG. 2 is a left side view of the oil mist removing device of FIG.

FIG. 3 is a top view of the oil mist removing device of FIG.

FIG. 4 is a left side view in which a discharge-side filter is omitted and a part is cut away.

FIG. 5 is a plan view of the centrifugal impeller of FIG. 4;

FIG. 6 is a sectional view of only a discharge-side filter portion.

FIG. 7 is a plan view of a main part showing valve means.

FIG. 8 is a cross-sectional view of only a main part of a discharge filter according to another embodiment of the present invention.

FIG. 9 is a sectional view of only a discharge-side filter portion according to another embodiment of the present invention.

[Explanation of symbols]

2 ... Electric motor, 3 ... Fan unit, 4 ... Electric fan unit, 7 ... Centrifugal impeller, 10 ... Fixed impeller, 12 ... Fixed impeller, 13 ... Separation chamber, 16 ... Expansion chamber, 21 ... Oil droplet collecting member, 23 ... discharge side filter (inner discharge side filter),
33 ... Discharge side filter, 34 ... Oil droplet collecting member, 36 ...
Outer discharge side filter.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-293115 (JP, A) Japanese Utility Model Showa 55-141530 (JP, U) Japanese Utility Model Utility Model Showa 61-175233 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) B01D 45/14 B01D 46/24

Claims (3)

(57) [Claims] 1. An oil mist removing device that sucks mist-containing air into a separation chamber by rotation of an electric fan unit, and discharges purified air from a discharge-side filter attached to a discharge opening of a casing surrounding the separation chamber. in, the discharge opening, when the filter element of the discharge-side filter is saturated, the electric Fan'yu
Seepage out of the discharge side filter due to knit wind pressure
An oil droplet storage member that receives oil
An oil mist removing device , wherein the discharge-side filter is provided on a repelling member . 2. The discharge-side filter includes an inner discharge-side filter through which the mist-containing air discharged from the discharge opening of the casing flows, and an outer discharge-side filter in which the inner discharge-side filter is housed. 2. The discharge filter according to claim 1, wherein the inner discharge filter and the outer discharge filter are mounted on the oil droplet collecting member, and the discharge filter is mounted on the discharge opening. Oil mist removal device. 3. The oil droplet collecting member is provided with a first installation surface of the inner discharge side filter and a second installation surface of the outer discharge side filter which is higher than the first installation surface.
When each filter element becomes saturated on the installation surface and the second installation surface, the wind pressure of the electric fan unit causes
Recesses that ooze to the outside of each discharge side filter and receive dripping oil
3. The oil mist removing device according to claim 2 , wherein the oil gutters are formed individually.