JP2023102962A - mist collector - Google Patents

Abstract

To provide a mist collector capable of efficiently cooling a motor.SOLUTION: A mist collector includes: a fan 81; a motor 71 for rotating the fan 81; a first filter 31 which is disposed on a passage of an air flow generated by rotation of the fan 81 and collects mist contained in air; and an exhaust passage forming part 43 to which air from the first filter 31 flows to form an exhaust passage 46 for discharging air toward the motor 71.SELECTED DRAWING: Figure 3

Description

The present invention relates to mist collectors.

Japanese Utility Model Laid-Open No. 6-36742 (Patent Document 1) discloses a mist scattering prevention device for a machine tool, which includes an overall cover provided with an opening, an automatic open/close cover arranged at the opening, a plurality of discharge ports and suction ports provided on two opposite sides of the opening, and a mist collection device connected to the suction port via a duct. An air curtain is formed by providing an air flow directed from the discharge port to the suction port when the automatic open/close cover is opened.

Japanese Utility Model Laid-Open No. 6-36742

A mist collector for collecting mist is known as disclosed in the above-mentioned Patent Document 1. For example, when a work is machined using coolant in a machine tool, the coolant heated by machining heat becomes mist-like. When such oil mist is discharged outside the machine tool, it causes pollution in the factory, so a mist collector is used.

The mist collector is provided with a fan for introducing air containing mist and a motor for rotating the fan. Since the motor generates heat as the mist collector is driven, it is required to cool the motor efficiently.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems and to provide a mist collector capable of efficiently cooling a motor.

A mist collector according to the present invention includes a fan, a motor for rotating the fan, a first filter provided on a path of an air flow generated by the rotation of the fan to collect mist contained in the air, and an exhaust passage forming portion for forming an exhaust passage through which the air flows from the first filter and is discharged toward the motor.

According to the mist collector configured in this manner, mist is removed by the first filter, and the air discharged from the exhaust passage is directed to the motor. Thereby, the motor can be efficiently cooled.

Further preferably, the mist collector further includes a case body having an exhaust passage forming portion and housing the fan and the first filter.

According to the mist collector configured in this manner, the mist collector can be simplified by integrally providing the exhaust passage forming portion that forms the exhaust passage with the case body that accommodates the fan and the first filter.

Also preferably, the motor has a rotor and a stator, an output shaft connected to the fan inside the case body and outputting rotational motion from the rotor, and a motor case that houses the rotor and the stator. At least part of the motor case is arranged outside the case body.

According to the mist collector configured in this way, the air discharged from the exhaust passage is directed to the motor case housing the rotor and stator. This makes it possible to efficiently cool the rotor and stator that generate a particularly large amount of heat when the mist collector is driven.

Also preferably, the fan is a centrifugal fan that draws in air in the axial direction of a predetermined axis and sends out air radially outwardly of the predetermined axis. The exhaust passage forming portion is provided at a position spaced radially outwardly of the predetermined axis from the fan.

According to the mist collector configured in this way, by using the centrifugal fan, it is possible to provide the exhaust passage forming portion at a position away from the fan in the radial direction outside of the predetermined axis. Thereby, the thickness of the mist collector can be reduced in the axial direction of the predetermined axis.

Also preferably, the motor is provided side by side with the fan in the axial direction of the predetermined axis. The exhaust passage extends radially outward of the predetermined axis from the fan, is reversed in the radial direction of the predetermined axis, and opens radially inward of the predetermined axis.

According to the mist collector configured in this way, by reversing the exhaust passage in the radial direction of the predetermined axis, it is possible to realize a configuration in which the exhaust passage opens toward the inside in the radial direction of the predetermined shaft on which the motor is arranged, while the exhaust passage forming portion is configured compactly.

Also preferably, the mist collector further includes a second filter arranged in the exhaust passage.

According to the mist collector configured in this manner, the mist collection rate can be increased by passing the air flowing through the exhaust passage through the second filter.

As explained above, according to the present invention, it is possible to provide a mist collector capable of efficiently cooling a motor.

It is a perspective view which shows a machine tool. FIG. 2 is a perspective view showing a mist collector in FIG. 1; FIG. 2 is a cross-sectional view showing a mist collector in FIG. 1; FIG. 3 is a cross-sectional view showing the mist collector as viewed in the direction of arrows on line IV-IV in FIG. 2;

An embodiment of the invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

FIG. 1 is a perspective view showing a machine tool. Referring to FIG. 1, machine tool 100 is a lathe that performs work machining by bringing a tool into contact with a rotating work. The machine tool 100 is an NC (Numerical Control) machine tool in which various operations for machining a workpiece are automated by numerical control by a computer.

In this specification, for the convenience of describing the structure of machine tool 100, an axis parallel to the left-right direction (width direction) of machine tool 100 and extending horizontally is referred to as "Z-axis", an axis parallel to the front-rear direction (depth direction) of machine tool 100 and extending horizontally is referred to as "Y-axis", and an axis extending in the vertical direction is referred to as "X-axis".

First, the overall structure of a machine tool 100 using the mist collector 10 according to the present embodiment will be described.

The machine tool 100 has a cover body 21 . The cover body 21 defines the machining area 200 and forms the appearance of the machine tool 100 . The machining area 200 is a space in which the workpiece is machined, and is sealed so that foreign matter such as chips or cutting oil resulting from the machining of the workpiece does not leak out of the machining area 200 .

In the machining area 200, there are arranged a work spindle 11 for rotating the work about a rotation center axis 210 parallel to the Z-axis, and a turret-type tool post 12 that holds a plurality of tools and can turn about a turn center axis 220 parallel to the Z-axis direction. The tool post 12 is movable in the Z-axis direction and diagonal directions including Y-axis direction components and X-axis direction components. The machining area 200 may further include a tailstock for supporting the center of rotation of the work, or an opposing work spindle arranged to face the work spindle 11 in the Z-axis direction.

A cover opening 26 is provided in the cover body 21 . The cover opening 26 opens the processing area 200 to the outside space.

The cover body 21 has a first side cover 22 , a second side cover 23 and a ceiling cover 24 .

The first side cover 22 and the second side cover 23 are provided on both sides of the cover opening 26 in the Z-axis direction. An operation panel 28 is provided on the first side cover 22 . The operation panel 28 includes various buttons and switches used by the operator to operate the machine tool 100, a display section for indicating the machining state of the work in the machine tool 100, and the like. The work spindle 11 and the like are arranged inside the second side cover 23 .

The ceiling cover 24 is arranged on the ceiling of the machine tool 100 . A cover opening 26 is defined by the first side cover 22 , the second side cover 23 and the ceiling cover 24 .

The machine tool 100 further has a door portion 25 . The door portion 25 is provided in the cover opening portion 26 . The door portion 25 is slidable in the Z-axis direction between an open position (the position of the door portion 25 shown in FIG. 1) in which the cover opening portion 26 is opened and a closed position in which the cover opening portion 26 is closed. The door portion 25 is arranged to overlap the second side cover 23 when positioned at the open position. The door portion 25 defines a processing area 200 when positioned at the closed position.

The machine tool 100 further has a mist collector 10 . The mist collector 10 is connected to the cover body 21 . The mist collector 10 is guided from the processing area 200 to air containing oil mist in which the coolant is in the form of a mist. The mist collector 10 is a device that collects oil mist contained in the air and discharges clean air.

Mist collector 10 is connected to ceiling cover 24 . The mist collector 10 is provided in a posture in which a rotation center shaft 110, which will be described later, extends in the X-axis direction (vertical direction). The position of the cover body 21 to which the mist collector 10 is connected is not particularly limited, and may be the side surface of the second side cover 23, for example. In this case, the mist collector 10 may be provided in a posture in which the rotation center shaft 110, which will be described later, extends in the horizontal direction.

Next, the structure of the mist collector 10 in this embodiment will be described in detail. 2 is a perspective view showing the mist collector in FIG. 1. FIG. 3 is a sectional view showing the mist collector in FIG. 1. FIG. FIG. 4 is a cross-sectional view showing the mist collector as viewed in the direction of arrows on line IV-IV in FIG.

2 to 4, mist collector 10 has fan 81, motor 71, first filter 31, and case body 41. As shown in FIG.

Fan 81 is rotatable around rotation center axis 110 . As the fan 81 rotates, it introduces mist-containing air from the processing area 200 into the case body 41 . A motor 71 is provided as a power source for rotating the fan 81 . The first filter 31 is provided on the path of the airflow generated by the rotation of the fan 81 . The first filter 31 is configured to be able to collect mist contained in the air.

The case body 41 has the appearance of the mist collector 10 . The case body 41 is connected to the cover body 21 (ceiling cover 24).

The case body 41 has a case body portion 42 and an exhaust passage forming portion 43 . A fan 81 , a first filter 31 , and part of the motor 71 are accommodated in the case main body 42 . The exhaust passage forming portion 43 forms an exhaust passage 46 through which the air from the first filter 31 flows.

The case body 41 is provided with an intake port 45 and an exhaust port 44 . As the fan 81 rotates, air is drawn into the case body 41 through the intake port 45 , flows through the inside of the case body 41 , and is exhausted from the case body 41 through the exhaust port 44 .

The intake port 45 is provided in the case body portion 42 . The intake port 45 opens outward in the radial direction of the rotation center axis 110 . The intake port 45 has a constant width in the axial direction of the rotation center axis 110 and has an opening shape that circles around the rotation center axis 110 in a strip shape. The intake port 45 opens inside the processing area 200 . The shape of the opening of the intake port 45 is not particularly limited.

The exhaust port 44 is provided in the exhaust passage forming portion 43 . The exhaust port 44 is an opening formed by the exhaust passage 46 . The exhaust port 44 opens outside the processing area 200 . The intake port 45 has a rectangular opening shape. The arrangement of the exhaust port 44 will be described later in detail.

The mist collector 10 further has a first straightening plate 61 and a second straightening plate 62 . The first straightening plate 61 and the second straightening plate 62 are housed in the case body 41 . The first rectifying plate 61 and the second rectifying plate 62 are housed in the case body portion 42 .

The first straightening plate 61 and the second straightening plate 62 are fixed to the case body portion 42 . The first straightening plate 61 and the second straightening plate 62 are arranged around the rotation center axis 110 . The first rectifying plate 61 and the second rectifying plate 62 are spaced apart from each other in the axial direction of the rotation center shaft 110 . The first straightening plate 61 is arranged upstream of the air flow formed inside the case body 41 relative to the second straightening plate 62 . The first rectifying plate 61 and the second rectifying plate 62 regulate the air flow formed inside the case body 41 .

The first filter 31 is housed in the case body portion 42 . The first filter 31 has a disc shape centered on the rotation center axis 110 . The first filter 31 is arranged parallel to a plane orthogonal to the rotation center axis 110 . The first filter 31 is arranged between the first straightening plate 61 and the second straightening plate 62 in the axial direction of the rotation center axis 110 . The first filter 31 includes a net-like mesh body in which fine holes are arranged.

Fan 81 is a centrifugal fan. Fan 81 sucks air in the axial direction of rotation center axis 110 and sends air radially outward of rotation center axis 110 .

Fan 81 is arranged parallel to a plane orthogonal to rotation center axis 110 . The fan 81 is arranged to face the second current plate 62 in the axial direction of the rotation center axis 110 . The second current plate 62 is arranged between the first filter 31 and the fan 81 in the axial direction of the rotation center axis 110 .

The motor 71 is arranged side by side with the fan 81 in the axial direction of the rotation center shaft 110 . Fan 81 is arranged between motor 71 and second current plate 62 in the axial direction of rotation center axis 110 .

The mist collector 10 further has a fan case 59 . The fan case 59 is accommodated in the case body portion 42 . Fan case 59 has a cylindrical shape centered on rotation center axis 110 . An opening 83 is provided in the fan case 59 . The opening 83 opens outward in the radial direction of the rotation center axis 110 within a predetermined angular range around the rotation center axis 110 . The fan case 59 guides the air sent out from the fan 81 in the circumferential direction of the rotation center shaft 110 and directs it radially outward of the rotation center shaft 110 through the opening 83 .

The motor 71 has an output shaft 76 , a rotor 79 , a stator 78 and a motor case 72 .

The output shaft 76 extends on the axis of the rotation center axis 110 . The rotor 79 is arranged around the rotation center axis 110 . The rotor 79 is connected to the output shaft 76 . The output shaft 76 is supported by a bearing (not shown) so as to be rotatable about a rotation center axis 110 . The output shaft 76 outputs rotational motion from the rotor 79 .

Stator 78 is arranged around rotation center axis 110 . The stator 78 is arranged on the outer circumference of the rotor 79 with a gap in the radial direction of the rotation center axis 110 . The stator 78 is supported by a housing (not shown).

The motor case 72 has the appearance of the motor 71 . The rotor 79 and stator 78 are housed in the motor case 72 . The motor case 72 is provided side by side with the fan case 59 in the axial direction of the rotation center axis 110 . At least part of the motor case 72 is arranged outside the case body 41 . The output shaft 76 extends from the inside of the motor case 72 toward the outside. The output shaft 76 is connected to the fan 81 and the first filter 31 outside the motor case 72 .

The case body 41 (case body portion 42 ) has a side portion 56 , a top portion 57 and a tapered portion 58 .

Side portion 56 extends along the axial direction of rotation center axis 110 . Side portion 56 is provided to surround motor 71 , fan 81 , second current plate 62 and first filter 31 on the outer periphery of rotation center shaft 110 . The top portion 57 extends in a planar direction perpendicular to the rotation center axis 110 . The top portion 57 is provided in a ring shape around the rotation center axis 110 . An outer peripheral edge of the top portion 57 is connected to an end portion of the side portion 56 in the axial direction of the rotation center shaft 110 .

The tapered portion 58 extends from the inner peripheral edge of the top portion 57 toward the fan 81 in the axial direction of the rotation center axis 110 . The tapered portion 58 has a tapered shape in which the diameter centered on the rotation center axis 110 decreases as the fan 81 is approached in the axial direction of the rotation center axis 110 . The tapered portion 58 is provided so as to surround the motor case 72 on the outer circumference of the rotation center shaft 110 .

Motor case 72 has a side portion 74 and a top portion 73 . Side portion 74 has a cylindrical shape centered on rotation center axis 110 . The side portion 74 is provided so as to surround the stator 78 on the outer periphery of the rotation center shaft 110 . The top portion 73 extends in a planar direction perpendicular to the rotation center axis 110 . The top portion 73 has a disk shape centered on the rotation center axis 110 . Top portion 73 faces rotor 79 and stator 78 in the axial direction of rotation center axis 110 . An outer peripheral edge of the top portion 73 is connected to an end portion of the side portion 74 in the axial direction of the rotation center shaft 110 .

A portion of the side portion 74 faces the tapered portion 58 in the radial direction of the rotation center axis 110 . A space between a portion of side portion 74 and tapered portion 58 that face each other in the radial direction of rotation center axis 110 is a space outside case body 41 (external space). The distance between fan 81 and top portion 73 in the axial direction of rotation center axis 110 is greater than the distance between fan 81 and top portion 57 in the axial direction of rotation center axis 110 . That is, the top portion 73 is provided so as to protrude further toward the external space than the top portion 57 in the axial direction of the rotation center axis 110 .

The exhaust passage forming portion 43 forms an external appearance of the mist collector 10 and forms a duct that forms an exhaust passage 46 . The exhaust passage 46 guides the air sent out by the fan 81 to the exhaust port 44 .

The exhaust passage forming portion 43 is provided at a position away from the fan 81 radially outward of the rotation center shaft 110 . The exhaust passage forming portion 43 is provided at a position away from the first filter 31 radially outward of the rotation center shaft 110 . The exhaust passage forming portion 43 is connected to the case main body portion 42 from the radially outer side of the rotation center shaft 110 .

The exhaust passage 46 extends radially outward from the rotation center shaft 110 from the fan 81 , reverses in the radial direction of the rotation center shaft 110 , and opens radially inward from the rotation center shaft 110 .

More specifically, the exhaust passage 46 includes a first exhaust passage 46A, a second exhaust passage 46B, and a third exhaust passage 46C. The first exhaust passage 46A, the second exhaust passage 46B, and the third exhaust passage 46C are arranged in the listed order from the upstream side to the downstream side of the air flow in the exhaust passage 46 .

The first exhaust passage 46A communicates with a space 82 inside the fan case 59 via an opening 83 . The first exhaust passage 46</b>A extends from the fan case 59 toward the outside in the radial direction of the rotation center axis 110 . The first exhaust passage 46A is provided adjacent to the fan 81, the second current plate 62, and the first filter 31 in the planar direction orthogonal to the rotation center axis 110. As shown in FIG. The first exhaust passage 46</b>A guides the air from the space 82 inside the fan case 59 toward the outside in the radial direction of the rotation center axis 110 .

The second exhaust passage 46B is stacked on the first exhaust passage 46A in the axial direction of the rotation center shaft 110 . The second exhaust passage 46B extends in the axial direction of the rotation center shaft 110 from the first exhaust passage 46A. The second exhaust passage 46B is provided adjacent to the motor 71 (motor case 72) in a planar direction orthogonal to the rotation center axis 110. As shown in FIG. The second exhaust passage 46B guides the air from the first exhaust passage 46A in the axial direction of the rotation center shaft 110. As shown in FIG.

The third exhaust passage 46C is stacked on the second exhaust passage 46B in the axial direction of the rotation center shaft 110 . The third exhaust passage 46C extends radially inward of the rotation center axis 110 from the second exhaust passage 46B. An exhaust port 44 is provided at the tip of the third exhaust passage 46C extending radially inward of the rotation center shaft 110 . The third exhaust passage 46</b>C guides the air from the second exhaust passage 46</b>B toward the inside in the radial direction of the rotation center shaft 110 and discharges the air to the external space through the exhaust port 44 .

The exhaust passage 46 (third exhaust passage 46</b>C) is configured to discharge air toward the motor 71 . The exhaust port 44 opens directly above the top portion 57 . The exhaust port 44 opens radially inward of the rotation center shaft 110 . The opening width of the exhaust port 44 in the direction orthogonal to the rotation center axis 110 is larger than the diameter of the top portion 73 centering on the rotation center axis 110 . The exhaust passage forming portion 43 is configured such that the air discharge direction from the exhaust port 44 is parallel to the top portion 57 .

The mist collector 10 further has a second filter 36 . The second filter 36 is arranged in the exhaust passage 46 . The second filter 36 is arranged in the second exhaust passage 46B. The second filter 36 has a cuboid shape and fills the second exhaust passage 46B. The particle size that can be captured by the second filter 36 is smaller than the particle size that can be captured by the first filter 31 .

Rotational motion from the rotor 79 is transmitted to the fan 81 and the first filter 31 via the output shaft 76 when the mist collector 10 is driven. As a result, the fan 81 and the first filter 31 rotate about the rotation center axis 110 . As the fan 81 rotates, an air flow is formed in the case body 41 from the intake port 45 toward the exhaust port 44 as indicated by the arrow in FIG.

Air containing oil mist generated in the processing area 200 is guided to the mist collector 10 as the fan 81 rotates. The air that has entered the case body 41 through the intake port 45 passes through the first filter 31 that rotates about the rotation center axis 110 . At this time, while the air passes through the mesh of the first filter 31, the oil mist contained in the air collides with the first filter 31 rotating at high speed and cannot pass through the mesh of the first filter 31. - 特許庁This separates the air from the oil mist. The separated oil mist is collected in the machining area 200 of the machine tool 100 or in the coolant tank through a drain (not shown).

The air that has passed through the first filter 31 and is sent out from the fan 81 flows through the first exhaust passage 46A, the second exhaust passage 46B, and the third exhaust passage 46C in this order. At this time, the oil mist remaining in the air is removed by passing the air through the second filter 36 arranged in the second exhaust passage 46B. The air from which the oil mist has been removed is discharged to the external space through the exhaust port 44 . Air discharged from the exhaust port 44 flows toward the motor 71 . As a result, the motor 71 that generates heat as the mist collector 10 is driven can be efficiently cooled.

Especially in this embodiment, the air discharged from the exhaust port 44 flows directly above the motor case 72 (the top portion 73 ) while passing over the top portion 57 . Thereby, the rotor 79 and the stator 78 accommodated in the motor case 72 can be efficiently cooled.

An exhaust passage forming portion 43 forming an exhaust passage 46 is provided integrally with the case body 41 . As a result, the mist collector 10 can be configured more easily than when a pipe member such as a hose for forming the exhaust passage 46 is provided separately.

Further, as the fan 81 for guiding air containing mist to the mist collector 10, a centrifugal fan that sends air radially outward of the rotation center shaft 110 is used. As a result, the exhaust passage forming portion 43 can be provided at a position away from the fan 81 in the radial direction of the rotation center shaft 110, so that the mist collector 10 can be made thinner in the axial direction of the rotation center shaft 110. In particular, in the present embodiment, the mist collector 10 is mounted on the ceiling of the machine tool 100, so it can greatly contribute to the reduction of the height of the machine tool 100. FIG.

To summarize the structure of the mist collector 10 in the embodiment of this invention, the Mist Collector 10 in the present embodiment is the first filter that is provided on the air flow from the rotation of the fan 81, the motor 71 for rotating the fan 81, and the air flow that is generated on the rotation of the fan 81. It is equipped with 31, an exhaust passage formation portion 43, which forms an exhaust passage 46 that emits air toward the motor 71.

According to the mist collector 10 according to the embodiment of the present invention configured in this manner, the clean air discharged from the exhaust passage 46 can be used to efficiently cool the motor 71 .

In the present embodiment, the case where the exhaust passage forming portion 43 is provided integrally with the case body 41 has been described, but the present invention is not limited to this, and the exhaust passage forming portion may be configured by a pipe member such as a hose. Also, the first filter in the present invention may be of a fixed type, or may be provided downstream of the airflow introduced into the mist collector from the fan. The mist collector in the present invention may be placed separately from the machine tool, and in this case, the working area of the machine tool and the air inlet of the mist collector may be communicated using a tube member such as a hose.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents of the scope of the claims.

INDUSTRIAL APPLICABILITY The present invention is used for mist collectors used in machine tools and the like.

10 mist collector, 11 work spindle, 12 tool rest, 21 cover body, 22 first side cover, 23 second side cover, 24 ceiling cover, 25 door part, 26 cover opening part, 28 operation panel, 31 first filter, 36 second filter, 41 case body, 42 case body part, 43 exhaust passage forming part, 44 exhaust port, 45 intake port, 46 exhaust passage, 46A first exhaust passage, 46B second exhaust passage, 46C third exhaust passage, 56, 74 side portion, 57, 73 top portion, 58 tapered portion, 59 fan case, 61 first straightening plate, 62 second straightening plate, 71 motor, 72 motor case, 76 output shaft, 78 stator, 79 rotor, 81 fan, 82 space, 83 opening, 100 machine tool, 110, 210 rotation center Axis, 200 working area, 220 turning central axis.

A mist collector according to one aspect of the present invention includes a fan, a motor for rotating the fan, a first filter provided on a path of an air flow generated by the rotation of the fan to collect mist contained in the air, and a case body having an exhaust passage forming portion for forming an exhaust passage through which the air flows from the first filter and discharges the air toward the motor, and which houses the fan and the first filter. The motor has a rotor and a stator, an output shaft that is connected to the fan inside the case body and outputs rotational motion from the rotor, and a motor case that houses the rotor and the stator. The motor case has a top portion facing the rotor and the stator in the axial direction of the rotation center axis of the motor. At least part of the motor case, including the top, is arranged outside the case body. The exhaust passage discharges air so as to pass directly above the top in the axial direction of the rotation center axis of the motor.
A mist collector according to another aspect of the present invention includes a fan, a motor for rotating the fan, a first filter provided on the path of the air flow generated by the rotation of the fan to collect mist contained in the air, and an exhaust passage forming portion for forming an exhaust passage through which the air flows from the first filter and is discharged toward the motor.

Claims (6)

with a fan
a motor for rotating the fan;
a first filter provided on the path of the air flow generated by the rotation of the fan and collecting mist contained in the air;
and an exhaust passage forming portion that forms an exhaust passage through which the air from the first filter flows and the air is discharged toward the motor. 2. The mist collector according to claim 1, further comprising a case body having said exhaust passage forming portion and housing said fan and said first filter. The motor is
a rotor and a stator;
an output shaft connected to the fan inside the case body and outputting rotational motion from the rotor;
a motor case that accommodates the rotor and the stator;
3. The mist collector according to claim 2, wherein at least part of said motor case is arranged outside said case body. The fan is a centrifugal fan that takes in air in an axial direction of a predetermined axis and sends out air outward in a radial direction of the predetermined axis,
4. The mist collector according to any one of claims 1 to 3, wherein said exhaust passage forming portion is provided at a position spaced radially outward of said predetermined axis from said fan. the motor is provided side by side with the fan in the axial direction of the predetermined shaft;
5. The mist collector according to claim 4, wherein said exhaust passage extends radially outwardly of said predetermined axis from said fan, reverses in the radial direction of said predetermined axis, and opens radially inwardly of said predetermined axis. 6. A mist collector according to any one of claims 1 to 5, further comprising a second filter arranged in said exhaust passage.

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