JP2009220092A - Filter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter apparatus suited for collecting oil mist of a size of about 0.1-10 μm particle diameter produced during cutting a part with a machine tool. <P>SOLUTION: An exhaust port 4 is formed at the center of the bottom of a case 2, an air inlet 10 for feeding mist-containing air is provided on the side of the case 2, and a first holder 25 is vertically erected in the case 2 in a manner to surround the exhaust port 4. A second holder 38 and a third holder 40 are disposed concentrically with the first holder 25, a first filter 31 made from a folded nonwoven fabric of 1-0.1 μm mesh is fitted to the outside of the first holder 25, and a second filter 38 made from a folded nonwoven fabric of 3-5 μm mesh is fitted to the outside of the second holder 35, and a third filter 43 made from a folded nonwoven fabric of 30-50 μm mesh is fitted to the outside of the third holder 40. The exhaust pipe 5 is secured to the suction side of a suction means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filter device suitable for collecting oil mist having a particle size of about 0.1 to 10 microns generated during cutting of a part in a machine tool.

  Machine tools such as machining centers and CNC lathes perform drilling, threading, grinding, etc. on workpieces made of metal materials with cutting tools that automatically operate in accordance with a program in a closed machining chamber. Oil mist generated from the cutting fluid is collected by a mist collecting device attached to the processing chamber. As the mist collecting device used for such applications, various structures such as a filter method, a demister method, a collision plate method, and an electric dust collection method are known.

  Patent Document 1 discloses a mist collecting device that can remove fine oil mist having a particle size of about 1 micron in air sucked into a case by rotating a filter with a motor device. ing.

  Further, Patent Document 2 discloses a mist collecting device in which a disc-shaped rotating brush and a swinging member that shakes off mist by centrifugal force are fixed to a main shaft in a separation tank, and a suction unit is connected to a cyclone disposed in the lower part of the tank. Is disclosed.

The oil mist generated at the time of cutting a part in a machine tool has a fine particle size of about 0.1 to 1 micron, and it is difficult to completely recover the oil mist. In any case, unless the generated mists are processed efficiently, it can be said that it is difficult to make the work environment comfortable and to ensure the safety of the worker.
JP 2006-314878 A JP 2006-192362 A

  An object of the present invention is to provide a filter device suitable for collecting oil mist having a particle size of about 0.1 to 10 microns generated during cutting of a part in a machine tool.

  In order to achieve the above object, the invention described in claim 1 is characterized in that an exhaust port is formed at the center of the bottom of the case with a cover attached to the upper opening, and an exhaust pipe extending outward from the exhaust port is provided. An air inlet for introducing air containing mist is provided on the side portion of the case, and a cylindrical first holder having a plurality of through holes formed in the peripheral portion is erected in the case so as to surround the exhaust port. Then, the second holder and the third holder are arranged concentrically with the first holder, and the first filter formed into a cylindrical shape by the mesh-shaped nonwoven fabric having a mesh size of 1 to 0.1 μm is disposed outside the first holder. A second filter formed in a cylindrical shape with a 3-5 μm saddle-shaped nonwoven fabric is placed outside the second holder, and a third filter formed in a cylindrical shape with a mesh-shaped nonwoven fabric of 30-50 μm is placed outside the third holder. Provided to be attached to each, front And characterized in that an exhaust pipe to be attached to the suction side of the suction means.

  In order to achieve the same object, the invention described in claim 2 is the filter device according to claim 1, in which a demister material made of a nonwoven fabric having a mesh size of 30 to 50 μm and a thickness of 10 mm is used instead of the third filter. It is provided so as to be wound 2-3 times around the outside of the third holder.

  In order to achieve the same object, the invention described in claim 3 is the filter device according to claim 1 or 2, wherein a drain port is provided at the bottom of the case, and a drain tank is attached to the drain port. It is a feature.

  In order to achieve the same object, the invention described in claim 4 is characterized in that an exhaust port is formed at the center of the bottom of the case with a cover attached to the upper opening, and an exhaust pipe extending outward from the exhaust port is provided. An air inlet for introducing air containing mist is provided on the side of the case, and a cylindrical holder having a large number of through holes formed in the periphery is erected in the case so as to surround the exhaust port. A filter formed in a cylindrical shape with a mesh-like non-woven fabric having a mesh size of 1 to 0.1 μm is attached to the outside of the holder, and an ultrafine fiber having a predetermined thickness of 1 to 0.1 μm mesh is formed on the outer peripheral surface of the filter's collar. Wind one or more demister materials made of dendritic nonwoven fabric so that they are almost along, and then insert a plastic mesh plate member into the recessed area between each adjacent demister material, and attach a presser band from above. And the exhaust pipe It is configured to be attached to the suction side of the suction means.

(Invention of Claim 1)
This filter device is structured to be attached to the suction side of suction means such as a Roots-type blower having a degree of vacuum of −3 to −30 kPa, and has a particle size of about 0.1 to 10 microns generated when cutting parts in a machine tool. The oil mist of a large size can be collected efficiently, and it is easy to perform maintenance management such as cleaning and replacement of the filter.

(Invention of Claim 2)
In this filter device, instead of the third filter according to claim 1, a demister material made of a nonwoven fabric having a mesh of 30 to 50 μm and a thickness of 10 mm is wound around the outside of the third holder. Effective in collecting mist.

(Invention of Claim 3)
This filter device is provided with a drain tank at a drain port provided at the bottom of the case, and drainage stored in the drain tank can be collected in a timely manner, which is convenient.

(Invention of Claim 4)
This filter device can be miniaturized by adopting a simple structure in which a demister material made of ultrafine fiber tourmaline nonwoven fabric is wound around the outer periphery of the filter ridge, and the particle size generated when cutting parts in machine tools It is possible to efficiently collect oil mist having a size of about 0.1 to 10 microns.

  The best mode of the present invention will be described below with reference to the drawings. 1 is a longitudinal side view of the filter device of the first embodiment, FIG. 2 is a transverse cross-sectional view of the filter device, FIG. 3 is a perspective view of the same main portion in section, and FIG. 4 is a perspective view of the filter device of the first embodiment. FIG. 5 is a vertical sectional side view of the filter device of the second embodiment, FIG. 6 is a cross-sectional view of the same, FIG. 7 is an explanatory view showing a part of the first filter and the demister material, and FIG. Is an explanatory view showing a fixed state of the demister material to the first filter, and FIG. 9 is a graph showing the collection performance of the filter device of the second embodiment.

(First embodiment)
The filter device 1 according to the first embodiment of the present invention is mounted on the suction side of suction means having a vacuum degree of −3 to −30 kPa, such as a Roots-type blower.
In FIG. 1, a case 2 of the filter device 1 has a low-cylindrical shape with an open top, and an exhaust pipe 5 that forms an exhaust port 4 at the center of the bottom portion 3 and extends outward from the exhaust port 4. Are integrated. Reference numeral 6 denotes a flange for attachment integrally provided at the tip of the exhaust pipe 5, and 7 denotes a drain port formed at an appropriate position of the bottom 3. The side portion 8 of the case 2 is provided with an intake pipe 11 in which a suction port 10 for introducing air containing mist is formed in a lateral direction. Reference numeral 12 denotes a flange for attachment provided integrally at the tip of the intake pipe 11, and 13 denotes an attachment port for a vacuum gauge provided in the intake pipe 11.

  In addition, about the side part 8 of the case 2, it is not restricted to the structure provided integrally with the bottom part 3, but it can also be set as a separate structure.

  Reference numeral 15 denotes several support protrusions provided at equal angular intervals on the outer periphery of the side portion 8 of the case 2, and 16 denotes bolts provided on the support protrusions 15 so as to stand upright. A ring-shaped packing 19 is attached to the opening 2 a of the case 2. The circular cover 21 attached to the opening 2a is provided so as to be tightened by the wing nut 17 through the bolts 16 to the same number of locking pieces 22 provided so as to correspond to the bolts 16 respectively. .

  Reference numeral 25 denotes a cylindrical first holder in which a large number of small-diameter through holes 26 are formed in the peripheral portion. The first holder 25 is provided at a height slightly lower than the side portion 8 of the case 2 and is erected in the case 2 so as to surround the exhaust port 4. A first filter 31 formed in a cylindrical shape with a mesh-shaped nonwoven fabric having a mesh size of 1 to 0.1 μm is attached to the outside of the first holder 25, and is erected on a bridge 4 a formed integrally in the center of the exhaust port 4. A disc-shaped cover 28 passing through the central portion of the support bolt 27 is fastened and fixed with a wing nut 29. Also, thin ring-shaped packings 30 a and 30 b are interposed between the first filter 31 and the bottom 3 of the case 2 and between the first filter 31 and the cover 28.

  The second holder 35 and the third holder 40 are sequentially arranged concentrically with the first holder 25 as the center, and both are provided at substantially the same height as the side portion 8 of the case 2. As shown in FIG. 3, a large number of small-diameter through holes 36 are formed in the peripheral portion of the cylindrical second holder 35. Similarly, a large number of small-diameter through holes 41 are formed in the peripheral portion of the cylindrical third holder 40. Reference numerals 32 denote positioning protrusions of the second holder 35 provided on the bottom 3 of the case 2, and are arranged at four positions slightly closer to the center than the inner surface of the holder 35. Similarly, 33 is a positioning protrusion of the second holder 35.

  A second filter 38 formed in a cylindrical shape with a mesh-like non-woven fabric having a mesh of 3 to 5 μm is attached to the outside of the second holder 35, and a mesh-like non-woven fabric with a mesh of 30 to 50 μm is attached to the outside of the third holder 40. A third filter 43 formed in a cylindrical shape is provided so as to be mounted.

  Ring-shaped packings 37a and 37b having a small thickness are interposed between the second filter 38 and the bottom 3 of the case 2 and between the second filter 38 and the cover 21. Similarly, thin ring-shaped packings 42 a and 42 b are interposed between the third filter 43 and the bottom 3 of the case 2 and between the third filter 43 and the cover 21.

A drain tank 46 is attached to the drain port 7 via a first cock 45. A second cock 47 is provided at the outlet of the drain tank 46.
Thereby, the filter apparatus 1 of 1st Embodiment which concerns on this invention is comprised.

  The third filter 43 is formed into a cylindrical shape with a mesh-like non-woven fabric having a mesh of 30 to 50 μm. Instead, a demister material made of a non-woven fabric having a mesh of 30 to 50 μm and a thickness of 10 mm is used. It can also be set as the structure provided so that it may wind 2-3 times on the outer side of 3 holders 40.

(Experiment 1)
The filter device 1 of the first embodiment was attached to the suction side of the Roots-type blower, and an experiment was conducted on the oil mist collection performance under the following conditions. The result is shown in the graph of FIG.
Generation amount of oil mist (using chlorine-based light oil): 5 to 15 mg / m ³
Laboratory room (automatic machine work room) size: 2.5 m ³
Roots blower performance Displacement: 4.3m ³ / min
Vacuum pressure: -2.0kPa
Suction diameter: 80mm
Rotation speed: 1800rpm
Motor output: 3.7kW

As a result of the experiment, the concentration of mist discharged from the Roots-type blower was stable at 0.01 mg / m ³ . In addition, although it experimented also about what changed the 3rd filter mentioned above into the said demister material, the result similar to what used the 3rd filter was obtained. Further, regarding the amount of air collected with respect to the size of the work room, it is considered that an amount approximately twice the capacity of the room is required. Care must be taken when the ratio of the amount of recovered air is large, since the exhaust gas diffuses into the factory and causes the working environment to deteriorate.

(Second Embodiment)
The filter device 51 of the second embodiment according to the present invention is suitable for a case where the size of a work room is 2 m ³ or less, and the configuration of the filter portion is different from the filter device 1 of the first embodiment described above. Other configurations such as the case and the drain tank are the same. Therefore, about the same component as that, the code | symbol used for description of the same filter apparatus 1 is diverted, it describes in drawing and description is abbreviate | omitted.

  A holder 55 is formed in a cylindrical shape using a material such as punching metal having a large number of through holes 56. As shown in FIG. 5, the holder 55 is provided at a height slightly lower than the side portion 8 of the case 2 and is erected in the case 2 so as to surround the exhaust port 4. On the outside of the holder 55, a filter 60 formed into a cylindrical shape with a mesh-like non-woven fabric having a mesh size of 1 to 0.1 μm is mounted (FIG. 6).

  As shown in FIGS. 6 to 8, on the outer peripheral surface of the flange 61 of the filter 60, one or a plurality of ultrafine fiber tourmaline nonwoven fabrics having a predetermined thickness (about 1 mm) of mesh 1 to 0.1 μm, this implementation In the example, three demister members 63 are wound so as to be substantially along. Further, a plastic net plate member 65 is inserted into a recessed portion between the adjacent demister members 63, 63, and the presser band 70 is mounted thereon.

The holder 55 is fixed by tightening a disc-shaped cover 28 having a central portion through the support bolt 27 with a wing nut 29. Also, thin ring-shaped packings 59 a and 59 b are interposed between the filter 60 and the bottom 3 of the case 2 and between the filter 60 and the cover 57.
Thereby, the filter apparatus 51 of 2nd Embodiment which concerns on this invention is comprised.

  In addition, about the ultrafine fiber tourmaline nonwoven fabric as the demister material 63, the commercial item ["Tremmicron" (trademark) of Toray Industries, Inc. was used.

(Experiment 2)
The filter device 51 of the second embodiment was attached to the suction side of the Roots-type blower, and an experiment was conducted on oil mist collection performance under the following conditions.
The amount of oil mist generated and the laboratory size were the same as in Experiment 1. The experimental results are shown in the graph of FIG.
Roots blower performance Displacement: 2.8 m ³ / min
Vacuum pressure: -7.0 kPa
Suction diameter: 80mm
Rotation speed: 1200rpm
Motor output: 3.7kW

As a result of the experiment, it was confirmed that the concentration of mist discharged from the Roots-type blower was stable at 0.01 mg / m ³ .

  As described above, this filter device is structured to be attached to the suction side of suction means having a vacuum degree of −3 to −30 kPa, such as a roots type blower, and has an oil size of about 0.1 to 10 microns. Suitable for collecting mist.

1 is a longitudinal side view of a filter device according to a first embodiment of the present invention. Same cross section Same perspective view with main part in section The graph which shows the collection performance of the filter apparatus of 1st Embodiment which concerns on this invention Vertical side view of the filter device of the second embodiment according to the present invention Same cross section Explanatory drawing showing part of filter and demister material Explanatory drawing which shows the fixed state of the demister material to the filter The graph which shows the collection performance of the filter apparatus of 2nd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Filter apparatus 2 of 1st Embodiment ... Case 3 ... Bottom part 4 ... Exhaust port 5 ... Exhaust pipe 7 ... Drain port 10 ... Intake port 25 ... 1st holder 31 ... 1st filter 35 ... 2nd holder 38 ... 2nd filter 40 ... 3rd holder 43 ... 3rd filter 46 ... Drain tank 51 ... 2nd Filter device 55 of embodiment example ... Holder 60 ... Filter 63 ... Demister material 65 ... Plastic mesh plate member 70 ... Presser band

Claims (4)

  An air inlet that forms an exhaust port at the center of the bottom of the case with a cover attached to the upper opening and that has an exhaust pipe extending outward from the exhaust port and introduces air containing mist to the side of the case A cylindrical first holder having a plurality of through holes formed in the periphery thereof is erected in the case so as to surround the exhaust port, and the second holder and the third holder are concentric with the first holder. A second filter is formed on the outer side of the first holder, and the first filter formed into a cylindrical shape with a mesh-shaped nonwoven fabric of 3 to 5 μm mesh. A filter is provided on the outside of the second holder, and a third filter formed in a cylindrical shape with a mesh-like non-woven fabric of 30 to 50 μm is attached to the outside of the third holder, and the exhaust pipe is provided on the suction side of the suction means. Configured to attach to Filter and wherein the a.   2. The demister material made of a nonwoven fabric having a mesh of 30 to 50 μm and a thickness of 10 mm is provided in place of the third filter so as to be wound around the outside of the third holder 2 to 3 times. Filter device.   The filter device according to claim 1 or 2, wherein a drain port is provided at a bottom portion of the case, and a drain tank is attached to the drain port.   An air inlet that forms an exhaust port at the center of the bottom of the case with a cover attached to the upper opening and that has an exhaust pipe extending outward from the exhaust port and introduces air containing mist to the side of the case A cylindrical holder with a large number of through holes formed in the periphery is erected in the case so as to surround the exhaust port, and is formed into a cylindrical shape with a mesh-shaped nonwoven fabric of 1 to 0.1 μm. The filter is mounted on the outside of the holder, and one or a plurality of demister materials made of an ultra-fine fiber tourmaline nonwoven fabric with a predetermined thickness of mesh 1 to 0.1 μm are substantially along the outer peripheral surface of the filter ridge. Further, the plastic net plate member is inserted into the depressed portion between the adjacent demister materials and the presser band is mounted thereon, and the exhaust pipe is attached to the suction side of the suction means. Specially configured Filter device to be a sign.

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