JPH08131738A - Device for removing oil mist - Google Patents

Abstract

PURPOSE: To prevent the oil mist in the form of a droplet from scattering again by adjusting the flow amount of mist-containing air. CONSTITUTION: A discharge side filter is provided with a valve means for adjusting oil flow amount. The valve means consists of a pair of adjusting plates 30 and 31 and is fixed on a metal-made cover 29 in a freely adjustable manner. The adjusting plates 30 and 31 respectively are provided with a pair of elongated holes 30a and 31a, into which screws 32 are inserted for threaded engagement with a discharge cylinder 8a of a rear casing and, after adjusting the cross sectional area of the passage of the discharge cylinder 8a relative to a discharge opening 8b, the adjusting plates 30 and 31 are fixed to the discharge cylinder 8a together with the cover 29 and an oil droplet collecting member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sucks mist-containing air into a separation chamber by the rotation of an electric fan unit, and discharges clean air from a discharge side filter attached to a discharge opening portion of a casing surrounding the separation chamber. The present invention relates to an oil mist removing device, and more particularly to a valve means for adjusting the flow rate into the discharge side filter.

[0002]

2. Description of the Related Art In the oil mist removing device disclosed in Japanese Patent 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 the arranged structure is provided in the box body. In addition, the blades of each impeller and the stationary blades are bent from the outer side in the radial direction into a substantially V shape, and a spiral oil discharge groove is formed on the inner peripheral wall surface of the casing supporting the fixed impeller. ing. In the conventional oil mist removing 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 spreads radially by the centrifugal impeller and is orthogonal to the rotation axis of the electric motor. Since it passes through the fixed impeller after colliding with the inner peripheral wall surface of the casing, the oil droplets in the felt arranged on the outer peripheral surface of each impeller are blown to the inner peripheral wall surface of the casing by centrifugal force, After passing through the spiral groove of the wall surface, the oil is discharged into the box body from an oil discharge port formed in the flange portion of the casing which is located on the outer side in the radial direction of the fixed impeller.

[0003]

In the conventional oil mist removing device, two chambers with partition walls are provided in the flow passage in the discharge side filter from the separation chamber to the discharge port of the box, and the mist-containing air is contained in the front chamber. After passing through the non-woven fabric filter element, it flows under the partition into the rear chamber and rises and is discharged to the discharge port on the rear chamber side. The mist-containing air meanders in a U shape in the middle partition. Since it is discharged while being discharged, it is considered that the oil mist in the form of oil droplets does not scatter, and the trapped oil does not scatter outside even when the nonwoven fabric filter element becomes saturated. 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. An object of the present invention is to prevent scattering of oil mist that has been turned into oil droplets by adjusting the flow rate into the discharge side filter, and to provide an oil mist removing device at low cost.

[0004]

In order to achieve such an object, in the oil mist removing device of the present invention, the rotation of the electric fan unit sucks the mist-containing air into the separation chamber and the casing surrounding the separation chamber is provided. In an oil mist removing device that discharges purified air from the discharge side filter attached to the discharge opening, in the flow path of the mist-containing air from the discharge opening of the casing to the circulation port of the discharge side filter, A valve means is provided for adjusting the flow rate of mist-containing air into the discharge side filter by rotation. Further, the valve means is constituted by an adjusting member detachably attached to the discharge opening of the casing.

[0005]

The mist-containing air sucked into the separation chamber by the rotation of the electric fan unit is converted into oil droplets by the centrifugal separation action. The mist-containing air with a small amount of mist is discharged to the outside as air purified by the oil mist captured by the discharge side filter. Further, since the valve means for adjusting the flow rate into the discharge side filter is provided, the flow rate of the mist-containing air into the discharge side filter can be adjusted.

[0006]

1 is a front view of an oil mist removing apparatus according to an 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 a discharge side filter is omitted and a part thereof is broken, FIG. 5 is a front view of a centrifugal impeller mounted on a rotating shaft of an electric motor, and FIG. 6 is a cross sectional view of the discharge side filter. FIG. 7 is a plan view of an essential part showing the valve means. Less than,
An embodiment of the present invention will be described in detail with reference to these drawings.

The oil mist removing device 1 cleans the 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 moving blades 7a on a hub 6 (three in the embodiment) mounted on the rotating shaft 5 of the electric motor 2 by being screwed at intervals in the axial direction.
Are individually screwed and fixed. Further, between the centrifugal impellers 7 are fixed by being sandwiched between a rear casing 8 directly fixed to the electric motor 2 and having a discharge cylinder 8a formed therein, and a center casing 9 fitted and fixed to the rear casing 8. Fixed impeller 10 having the fixed vanes 10a, the center casing 9, and the center casing 9
A stationary blade 1 fitted and fixed to the front casing 11 and fixed to the front casing 11 in which a suction port 11a is formed.
A fixed impeller 12 having 2a is configured. The space inside the fan unit 3 surrounded by the casings 8, 9 and 11 serves as a separation chamber 13.

Front casing 1 of fan unit 3
1, a rear housing 14 and a front housing 15 are sequentially fitted and fixed to the housing 1.
The space surrounded by 15 is defined as an expansion chamber 16. In addition, inside the expansion chamber 16, there is provided a wire mesh suction side filter 17 which is sandwiched and fixed by the rear housing 14 and the front housing 15. Note that reference numeral 18
Is a cylindrical housing fixed to the front of the front housing 15, and the mist-containing air is sucked into the expansion chamber 16 from the suction port 18 a of the cylindrical housing 18.

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

On the other hand, in the discharge cylinder 8a formed in the rear casing 8 of the fan unit 3, a discharge port 8b (see FIG. 7) of the discharge cylinder 8a and a circulation port 21a coaxial with the discharge port 8a and an oil drain pipe 2 are provided.
A bottomed cylindrical oil drop collecting member 21 having an oil drain port 21b to which 2 is fitted and fixed is provided. A discharge-side filter 23 is installed on the oil drop collecting 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 in a mountain shape, and a non-woven fabric filter wound two or three times on the outside of 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 number of through holes formed by punching. The first filter element 2 is provided with a sponge-like sealing member 27 fixed to the pair of synthetic resin covers 24a and 24b of the element 24.
A pair of covers 28 and 29 made of a metal material are fitted to the fourth filter element 25 and the reinforcing member 26. Although the reinforcing member 26 is integrally welded to the outer peripheral portion of the metal cover 29 having the through hole 29a, the reinforcing member 26 is erected by a corner clamp (not shown). It is a structure that can be opened and closed freely.

Further, the discharge side filter 23 having such a structure is provided with valve means for adjusting the flow rate as shown in FIG. In the valve means, an adjusting member including a pair of adjusting plates 30 and 31 having a substantially rectangular shape is fixed on a metal cover 29 so as to be adjustable and detachable.
That is, each of the adjusting plates 30 and 31 is formed with a pair of elongated holes 30a and 31a into which the screws 32 screwed into the discharge cylinder 8a of the rear casing 8 are inserted, and the discharge holes 8b of the discharge cylinder 8a are formed. After adjusting the flow passage cross-sectional area, the adjusting plates 30 and 31 are fixed to the discharge cylinder 8a together with the cover 29 and the oil drop collecting member 21. 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,
This is a structure in which the assembly 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 18a of the cylindrical housing 18. Be done. The mist-containing air in which a part of the oil mist is trapped in the expansion chamber 16 flows from the center side of the centrifugal impeller 7 to the inner peripheral surface side of each casing 8, 9, 11 in the separation chamber 13 and each casing. 9
Flow from the inner peripheral surface of 11 toward the center of the fixed impellers 10 and 12. Then, the oil mist of the mist-containing air that collides with the inner peripheral surfaces of the casings 8, 9 and 11 is made into oil droplets and discharged into the pedestal member 19.

In the separation chamber 13, the mist-containing air whose oil mist content has become very small is discharged from the discharge cylinder 8a of the rear casing 8 into the discharge side filter 23 at a flow rate adjusted by the valve means, and this discharge is carried out. It is discharged through the primary filter element 24 and the secondary filter element 25 of the side filter 23 while being cleaned and discharged to the outside of the apparatus. When the secondary filter element 25 of the discharge-side filter 23 is saturated and oil oozes out due to the repetition of such operations, the oil drops in the oil drop collecting member 21.
Since it drips, it flows from the oil drain pipe 22 to an oil drain recovery tank or the like and is recovered.

In this embodiment, the annular oil drop trough portion 21c is formed by the cylindrical portion of the cover 29 of the discharge side filter 23 and the oil drop collecting member 21, but the oil drop collecting portion 8a of the rear casing 8 collects oil drops. It is also possible to integrally form the parts and provide the oil drop trough part by the oil drop reservoir and the cover 29 of the discharge side filter 23.

Next, another embodiment of the valve means for adjusting the flow rate of the mist-containing air into the discharge side filter will be described. 8 and 9 show the discharge cylinder 8a of the rear casing 8.
FIG. 6 is an enlarged cross-sectional view of a main part of a portion where a discharge-side filter is attached to FIG. In each of the embodiments shown in these drawings, the valve means of FIG. 8 has an annular groove 8c formed in the end face of the discharge opening of the discharge cylinder 8a, and the groove 8c is provided with a flow port 33a having a set dimension. An adjusting ring 33 as an adjusting member is fitted.
Then, together with the cover 29 at the lower end of the discharge side filter 23 and the oil drop collecting member 21, the discharge cylinder 8a is fixed by the screw 32.
The structure is detachably fixed to. Therefore, depending on the scattered state of the oil mist at the place where the oil mist removing device is installed, the adjusting ring 33 having the flow openings 33a with different set dimensions is selected and attached.

Further, in the valve means of FIG. 9, a cylindrical adjusting tube 34 as an adjusting member having a through hole 34a is detachably attached to an annular groove 8d formed on the end face of the discharge opening of the discharge cylinder 8a. It is fitted and fixed. That is, the annular groove 8
A thread groove is formed on the circumferential surface of d, and the adjusting pipe 34 is formed in this thread groove.
The screw groove formed in the above is screwed together. Therefore, depending on the scattered state of the oil mist at the place where the oil mist removing device is installed, the distribution port 3 having different set dimensions
The adjustment tube 34 having the hole 4a is selected and attached.

Although a pair of adjusting plates 30, 31, an adjusting ring 33, and an adjusting pipe 34 are illustrated as the adjusting member of the valve means, the adjusting plate having a large number of through holes formed by punching is used as the discharge pipe 8a. The structure may be detachably fixed to. Further, the oil drop collecting member 21 and the discharge side filter 23 are also used as adjusting members, and the respective circulation ports 21a and 29a
The flow rate into the discharge side filter 23 may be adjusted by the design dimension of a.

[0019]

As described above, in the oil mist removing device according to the present invention, the mist air containing air is sucked into the separation chamber by the rotation of the electric fan unit, and the discharge provided in the discharge opening portion of the casing surrounding the separation chamber. In an oil mist removing device that discharges purified air from a side filter, in the flow path of the mist-containing air from the discharge opening portion of the casing to a flow port of the discharge side filter, the discharge by rotation of the electric fan unit Since the valve means for adjusting the flow rate into the side filter is provided, the flow rate can be adjusted so that a relatively large oil droplet is not discharged from the separation chamber into the discharge side filter. Also,
The oil mist captured by the filter element of the discharge side filter will not be scattered outside. Furthermore,
Specifications such as the scattered state of oil mist generated around the machine tool so that the oil that is relatively large oil droplets on the inner peripheral surface of the suction duct attached to the suction port of the cylindrical housing is not sucked into the equipment. The flow rate can be adjusted according to the environment. Therefore, the contamination of the filter element of the discharge side filter can be reduced without lowering the oil mist capture rate. Furthermore, since the valve means is composed of the adjusting member which is detachably attached to the discharge opening of the casing, the economical oil mist removing device can be provided at a low cost because the versatility of the device is good.

[Brief description of drawings]

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

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

3 is a top view of the oil mist removing device of FIG. 1. FIG.

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

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

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

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

FIG. 8 is an enlarged sectional view of an essential part showing another valve means.

FIG. 9 is an enlarged sectional view of an essential part showing another valve means.

[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 drop collecting member, 23 ... Discharge side filter, 30 ... Adjusting plate, 31 ...
Adjustment plate, 33 ... Adjustment ring, 34 ... Adjustment tube.

Claims (2)

[Claims] 1. An oil mist removing device for sucking mist-containing air into a separation chamber by the rotation of an electric fan unit and discharging clean air from a discharge side filter attached to a discharge opening of a casing surrounding the separation chamber. At
Valve means for adjusting the flow rate of the mist-containing air into the discharge-side filter due to the rotation of the electric fan unit in the flow path of the mist-containing air from the discharge opening of the casing to the flow port of the discharge-side filter. An oil mist removing device characterized by being provided with. 2. The oil mist removing device according to claim 1, wherein the valve means is constituted by an adjusting member which is detachably attached to the discharge opening of the casing.