JP2006043534A - Mist separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance oil mist collection efficiency of a mist separator for collecting oil mist or soot and dust contained in exhaust gas discharged when casting aluminum dies casting, mainly by centrifugal separation. <P>SOLUTION: This mist separator is provided with a casing 2 having an oil mist sump 2e for storing separated matter like oil mist or soot and dust, formed at a waste gas inlet 2d and on an inner bottom; a bottomed porous outer cylinder 7 rotatably contained in the casing and having first waste gas passages 7d communicating with the exhaust gas inlet and multiple small holes 7c drilled at least on the side face thereof; an inner cylinder 8 contained in the porous outer cylinder and having a second waste gas passage 8c formed inside and communicating with the first waste gas passages; fins 13 disposed in the radial direction in an annular space between the inner cylinder and porous outer cylinder, and connecting the inner cylinder with the outer cylinder in the radial direction; and an exhaust fan exhausting gas in the second waste gas passage of the inner cylinder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mist separator for collecting oil mist and dust contained in exhaust gas exhausted at the time of casting such as aluminum die casting mainly by centrifugation.

  In general, when casting aluminum die cast or the like, oil for release is sprayed in advance on a mold or the like, so that exhaust gas exhausted during the casting contains oil mist, dust, or the like.

  Therefore, conventionally, for example, oil mist and dust in the exhaust gas are collected by washing the exhaust gas with water and using an air filter.

  Further, as another mist separator, for example, a cyclone of a tangential inflow type or the like (for example, see Non-Patent Document 1) has been conventionally known.

  In this cyclone, exhaust gas flows into the main body of the funnel from the tangential direction of the inner peripheral surface thereof, and flows along the inner peripheral surface, thereby forming a semi-free vortex flow on the outer side near the inner peripheral surface. On the other hand, a forced vortex flow is formed on the center side, so that a double vortex structure is formed.

When the exhaust gas is swirling in the cyclone body due to these vortex flows, heavy oil mist and dust are separated from the gas phase of the exhaust gas by the centrifugal force, and collide with the inner wall surface of the cyclone body. And collected. If the cyclone body is made small, the separation limit particle size of oil mist and dust is reduced, and the dust collection efficiency is also increased.
Issued by Maruzen Co., Ltd. “Revised 5th edition, Chemical Engineering Handbook”, edited by the Society of Chemical Engineering, Japan.

  However, in the above conventional method of collecting oil mist using an air filter or the like, the air filter is clogged relatively early due to the adhesion of oil mist or dust, and it is necessary to replace the air filter at an early stage. There is a problem that it is complicated.

  In the conventional cyclone, the oil mist and dust in the exhaust gas collide with centrifugal force because the inner peripheral surface of the cyclone main body is a stationary fixed wall. There is a phenomenon that the light is reflected and is again caught up in the vortex of the exhaust gas. For this reason, there is a problem that the separation or collection efficiency of oil mist and dust is low.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a mist separator capable of improving the efficiency of mist collection such as oil mist.

  According to a first aspect of the present invention, there is provided an exhaust gas inlet and a case provided with a separated substance reservoir for collecting separated substances such as oil mist and dust formed at the inner bottom, and rotatably accommodated in the case. A bottomed porous outer cylinder having a first exhaust gas flow channel communicating with the first exhaust gas channel and a plurality of through-holes drilled in at least a side surface of the first exhaust gas flow channel; An inner cylinder having a second exhaust gas flow path communicating therewith and an annular gap between the inner cylinder and the porous outer cylinder are arranged in the radial direction, and the inner cylinder and the porous outer cylinder are connected in the radial direction. A mist separator including the fin and an exhaust fan that exhausts exhaust gas in the second exhaust gas flow path of the inner cylinder.

  The invention according to claim 2 is the mist separator according to claim 1, further comprising a drive device that rotationally drives the porous outer cylinder.

  The invention according to claim 3 is characterized in that a plurality of the fins are arranged at a predetermined interval in a circumferential direction and an axial direction of the porous outer cylinder and the inner cylinder. This is a mist separator.

  The invention according to claim 4 is the mist separator according to any one of claims 1 to 3, wherein the porous outer cylinder and the inner cylinder are detachably accommodated in the case. .

  The invention according to claim 5 is characterized in that the drive device comprises a connection mechanism for detachably connecting a rotary output shaft of a drive motor to the porous outer cylinder. It is a mist separator given in any 1 paragraph.

  The invention according to claim 6 is disposed so as to be able to communicate with the outlet side of the second exhaust gas flow path, and includes an exhaust path provided with the exhaust fan, an air filter disposed in the middle of the exhaust path, The mist separator according to any one of claims 1 to 5, wherein the mist separator is provided.

  According to the present invention, when the exhaust gas flows into the first exhaust gas flow path in the porous outer cylinder, the exhaust gas flows along the inner peripheral surface of the porous outer cylinder and generates a swirling flow or a vortex flow. For this reason, since centrifugal force is generated in the exhaust gas, heavy oil mist, dust, etc. in the exhaust gas are scattered in the centrifugal direction and collide with and adhere to the inner peripheral surface of the porous outer cylinder. It passes through a plurality of through holes and adheres to the inner wall of the case. As a result, oil mist and dust in the exhaust gas are separated from the exhaust gas and collected. Moreover, since the porous outer cylinder is rotatable and rotates with the swirling flow of the exhaust gas, the exhaust gas inflow speed and the rotation speed of the inner peripheral surface of the porous outer cylinder are substantially equal. Thereby, when oil mist and dust in the exhaust gas collide with the inner peripheral surface of the porous outer cylinder, it can be prevented or reduced from being reflected and returning to the gas flow again. Accordingly, it is possible to improve the collection efficiency of the separated matter such as oil mist and dust so that the exhaust gas collides with the fixed wall to separate and collect oil mist and dust and the like.

  Embodiments of the present invention will be described with reference to the accompanying drawings. In these accompanying drawings, the same or corresponding parts can be denoted by the same reference numerals.

  1 is a longitudinal sectional view of a natural rotation type mist separator 1 according to an embodiment of the present invention, FIG. 2 is an end view of a cut portion taken along line II-II in FIG. 1, and FIG. 3 is III-III in FIG. It is an end view of a line cutting part.

  As shown in FIG. 1, the mist separator 1 accommodates an inner drum 3 in a bottomed rectangular tube-shaped case 2 so as to be rotatable about its axis and detachable.

  The case 2 has an open upper end 2b of a case main body 2a that is concentrically and detachably attached to an upper end 2b of the case main body 2a having a bottomed rectangular tube shape. 2b is hermetically sealed.

  The case body 2a has an exhaust gas inlet 2d opened on one side surface (left side in FIG. 1), and an exhaust gas inlet pipe 4 is connected to the exhaust gas inlet 2d in an airtight manner.

  The case body 2a is formed with an oil mist reservoir 2e for storing the separated matter 5 such as oil mist and dust as a separated matter reservoir at the inner bottom thereof, and is also an exhaust for discharging the separated matter 5 such as oil mist to the outside. An oil hole 2f is formed, and the oil tank 6 is detachably connected to the oil drain hole 2f via a connecting pipe 2g. An open / close valve (not shown) may be provided in the connecting pipe 2g.

  On the other hand, the inner drum 3 has a bottomed cylindrical porous outer cylinder 7 that is rotatable and concentrically housed in the case main body 2 a along the inflow direction of the exhaust gas, and is further concentric in the porous outer cylinder 7. And an inner cylinder 8 housed in the housing. The inner cylinder 8 has a smaller diameter than the porous outer cylinder 7 and is open at both axial ends.

  The porous outer cylinder 7 is integrally formed with an outward flange 7f integrally with an open upper end 7b of a bottomed cylindrical main body 7a having an inner diameter of 300 mm, for example, on the side surface of the main body 7a of the porous outer cylinder 7 in the plate thickness direction. A large number of small holes 7c penetrating therethrough are formed almost entirely.

  The porous outer cylinder 7 has the lower end of the rotating shaft 9 concentrically fixed to the center of the inner surface of the bottom. The rotary shaft 9 has an upper end 9a in the figure that passes through the central axis in the inner cylinder 8, and further passes through the upper lid 2c of the case 2 so as to slightly protrude outward in the axial direction. The projecting upper end portion 9a is rotatably supported by an upper bearing 10 provided on the case upper lid 2c.

  The porous outer cylinder 7 has a support disk 11 detachably attached to the bottom thereof, and a plurality of tenons ha, ha,... Project from the support disk 11, and the tenons ha, ha,. A coupling mechanism is configured by detachably fitting into a plurality of mortises h, h drilled in the bottom of the cylinder body 7a. The support disk 11 has a short spindle 11a fixed to the central portion of the lower bottom surface in FIG. 1, and a lower bearing 12 of a thrust bearing that rotatably supports the spindle 11a is fixed to the central portion of the bottom inner surface of the case body 2a. Yes. Thereby, the upper and lower ends of the rotating shaft 9 are rotatably supported, and the porous outer cylinder 7 supported by the rotating shaft 9 is rotatably supported in the case main body 2a.

  The porous outer cylinder 7 includes a first exhaust gas flow that communicates with the exhaust gas inlet 2d an annular gap defined by the inner peripheral surface of the porous outer cylinder main body 7a and the outer peripheral surface of the inner cylinder 8. It is formed in the path 7d.

  On the other hand, the inner cylinder 8 is opened at both ends in the axial direction, and the lower end of the opening in FIG. 1 is opened as the exhaust gas inlet 8a, and the upper end of the opening is formed as the exhaust gas outlet 8b. Is formed in the second exhaust gas flow path 8c.

  In the inner cylinder 8, the exhaust gas inlet 8a is disposed slightly above the inner bottom surface 7e of the porous outer cylinder main body 7a, and the second exhaust gas flow path 8c is connected to the first of the porous outer cylinder 7 via the exhaust gas inlet 8a. It communicates with the exhaust gas flow path 7d.

  The inner cylinder 8 penetrates the upper end 8c in FIG. 1 on the exhaust gas outlet 8b side in the figure in the axial direction above the upper partition plate 2h of the case 2, and the inner drum 3 is disposed on the outer periphery of the through part in the drawing. A labyrinth packing 8d that can be pulled upward is formed. The upper partition plate 2h forms a space defined by this and the inner surface of the upper lid 2c of the case body 2a in the third exhaust gas flow path 8e.

  In the annular gap between the outer peripheral surface of the inner cylinder 8 and the inner peripheral surface of the porous outer cylinder 7, for example, a plurality of fins 13, 13,... Having a rectangular flat plate shape radially outward from the center of the inner cylinder 8. It is arranged.

  Each fin 13 has an inner peripheral side inner end of the rectangular flat plate fixed to the outer peripheral surface of the inner cylinder 8, while a rectangular flat plate outer peripheral side outer end is fixed to the inner peripheral surface of the porous outer cylinder 7. And the porous outer cylinder 7 are integrally connected in the radial direction.

  The fins 13 are arranged at a predetermined interval in the axial direction of the inner cylinder 8 and the porous outer cylinder 7, and are arranged at a predetermined pitch in the circumferential direction as shown in FIGS.

  And the inner drum 3 is comprised so that attachment or detachment is possible in the case main body 2a. That is, the upper lid 2c and the upper partition plate 2h are integrally or integrally formed, and the upper lid 2c and the upper partition plate 2h are detachably provided on the case body 2a, and the upper lid 2c and the upper partition plate 2h are separated from the case body 2a. After the removal, the inner drum 3 in which the inner cylinder 8 and the porous outer cylinder 7 are integrated by the plurality of fins 13 can be taken out of the case main body 2a from the space of the removed trace. After the removal, the required maintenance such as cleaning the inner drum 3 and the inside of the case body 2a can be easily performed.

  Then, a duct 14 having a bottomed rectangular tube with a lid is arranged in parallel on one side of the case body 2a. The square cylindrical duct 14 has one side wall 14a fixed integrally to the one side wall 2aO of the case body 2a, and the one side wall 2aO of the case body 2a is integrally used as a part of the one side wall 14a of the duct 14. is doing.

  The duct 14 has a communication port O communicating hermetically with the third exhaust gas flow path 8e on one side surface (left side surface in FIG. 1) of the upper end portion thereof, and a fourth exhaust gas communicating with the communication port O. A flow path 15 is formed in the duct 14. On the outlet side of the exhaust gas flow channel 15, an exhaust port 15 a is formed on the side surface of the lower end of the duct 14 in FIG.

The fourth exhaust gas flow channel 15 sequentially includes an air filter cartridge 16, an exhaust fan 17, and a fan motor chamber 19 that houses a fan motor 18 that drives the exhaust fan 17 from the inlet side toward the exhaust port 15 a in this order. The annular gap around the fan motor chamber 19 is formed in a part of the exhaust gas flow path. The exhaust fan 17 is operated so as to vent the exhaust gas at, for example, 30 m ³ / min.

  The fourth exhaust gas flow path 15 is provided with a silencer 20 for reducing exhaust noise on the downstream side of the fan motor chamber 19. The silencer 20 is configured by adhering a sound absorbing material 20 a to the inner surface of the duct 14 on the outlet side of the exhaust gas passage 15. The exhaust port 15a has a plurality of louvers 15b disposed at the exhaust port.

  Next, the operation of the mist separator 1 will be described.

  For example, the exhaust gas containing oil mist and dust generated during the casting of aluminum die cast or the like is introduced into the interior of the inner drum 3 from the inlet 3a via the exhaust gas inlet pipe 4 through the exhaust gas inlet 2d of the case body 2a. The At this time, as shown by the arrows in FIG. 2, the exhaust gas flowing into the outer peripheral side in the porous outer cylinder 7 of the inner drum 3 flows along the inner peripheral surface of the porous outer cylinder 7 and pushes the fins 13 to press the inner drum 3. Rotate. On the other hand, the exhaust gas flowing into the inner peripheral portion of the inner drum 3 from the exhaust gas inlet 2d is guided to the outer peripheral portion side of the inner drum 3 by the fins 13, and flows along the inner peripheral surface of the porous outer cylinder 7 to rotate the inner drum 3. To drive. These exhaust gases swirl around the inner cylinder 8 as shown by the thick black arrows in FIG. 1 in the first exhaust gas flow path 7c of the porous outer cylinder 7 due to the pressure of the exhaust gas and the intake force of the exhaust fan 17 itself. A swirling flow is generated and a vortex flow is generated by flowing down toward the exhaust gas inlet 8a of the inner cylinder 8.

  At this time, the porous outer cylinder 7 rotates at a predetermined speed around the rotary shaft 9 in the same direction as the swirl flow direction of the exhaust gas due to the swirl flow or vortex flow of the exhaust gas. Hereinafter, it is also referred to as oil mist or the like) is applied with a centrifugal force and scattered in the centrifugal direction to be separated from the gas phase.

  For this reason, scattered matter such as oil mist and soot and dust collides with and adheres to the inner peripheral surface of the porous outer cylinder 7 as shown by small arrows in FIGS. It collides with and adheres to the inner peripheral surface. These deposits flow down and are stored in the lower oil mist reservoir 2e due to their own gravity, and are eventually stored in the oil tank 6 through the oil drain hole 2f.

  The oil mist and dust in the exhaust gas colliding with the inner surface of the porous outer cylinder 7 are not reflected on the inner surface of the porous outer cylinder 7 and are reflected on the inner surface of the porous outer cylinder 7 because the porous outer cylinder 7 itself rotates. It adheres and gradually flows downward due to gravity and is stored in the oil reservoir 2e.

  Thus, the exhaust gas from which the oil mist and dust are separated in the porous outer cylinder 7 flows into the inner cylinder 8 through the exhaust gas inlet 8a of the inner cylinder 8 with the fine oil mist still remaining, The second exhaust gas flow path 8c in the inner cylinder 8, the exhaust gas outlet 8b, the third exhaust gas flow path 8e, and the communication port O sequentially flow into the fourth exhaust gas flow path 15 in the duct 14. Here, the air filter cartridge 16 is first ventilated. When this air filter cartridge 16 is ventilated, fine oil mist (fume) that has not been separated and collected by the inner drum 3 is collected and purified into clean air indicated by white arrows in the figure. The exhaust fan 18 exhausts the exhaust gas to the fourth exhaust gas flow path 15 where it is silenced by the silencer 20 and exhausted to the outside through the exhaust port 15a.

  Therefore, according to this mist separator 1, since the porous outer cylinder 7 is rotated by the swirling flow or vortex flow of the exhaust gas, the exhaust gas inflow speed and the rotation speed of the inner peripheral surface of the porous outer cylinder are substantially equal. As a result, oil mist and the like in the exhaust gas can be significantly reduced from being reflected and bounced off the inner wall surface of the porous outer cylinder 7, and the oil mist and the like can be prevented from returning to the exhaust gas again. The collection efficiency can be improved. Furthermore, centrifugal force is applied to the exhaust gas by the plurality of fins 13 of the porous outer cylinder 7, and oil mist, dust, etc. in the exhaust gas are scattered and adhered to the inner surface of the case body 2a by the centrifugal force, so that the inner surface of the cyclone body is separated. As compared with the conventional cyclone type oil mist separator or the like, in which the fixed wall (stationary wall) is used, the ability to separate and collect oil mist, dust and the like can be improved.

  Furthermore, since the scattered matter such as oil mist is passed through the numerous small holes 7d of the porous outer cylinder 7, even if the scattered matter collides with the inner peripheral surface which is the fixed wall of the case body 2a and is reflected, At this time, since the scattered matter passes from the porous outer cylinder 7 to the case body 2a side in each small hole 7d, it can be almost prevented from flowing back into the porous outer cylinder 7 through these small holes 7d. .

  Further, the separated matter 5 such as oil mist and dust in the exhaust gas is collected by centrifugal separation by the rotational force of the fins 13, and the separated matter 5 such as oil mist and dust is also collected by the air filter cartridge 16. Therefore, fine oil mist, dust, and other foreign matters that could not be captured by the centrifugal separation of the inner drum 3 can also be collected by the air filter / cartridge 16. For this reason, the collection capability of the separated materials 5 such as oil mist can be further improved. Further, since the air filter cartridge 16 removes fine oil mist and dust remaining after the oil mist and dust are removed by the inner drum 3, it is possible to delay the deterioration of the air filter cartridge 16 such as clogging. That is, maintenance of the air filter cartridge 16 can be reduced.

  Furthermore, the inner drum 3 can be easily removed from the space after the upper lid 2c and the upper partition plate 2h are removed to the outside of the case body 2a by removing the case upper lid 2c and the upper partition plate 2h from the support disk 11. It can be removed. For this reason, the inner drum 3 and the inside of the case main body 2a can be easily cleaned, and maintenance is easy.

  In addition, since the exhaust duct 14 is provided with an opening / closing lid 14b for entering and exiting the air filter in the accommodating portion for accommodating the air filter / cartridge 16, the ease of maintenance such as replacement of the air filter / cartridge 16 is improved. Can be made.

  Further, the spindle 11 at the center of the bottom of the porous outer cylinder 7 which is the lower part of the inner drum 3 is rotatably supported by the lower bearing 12, and the upper end portion of the rotating shaft 9 of the inner drum 3 is rotatable by the upper bearing 10. Since it supports, rotation of the inner drum 3 can be stabilized.

  FIG. 4 is a longitudinal sectional view of a natural rotation type mist separator 1A according to the second embodiment of the present invention, and FIG. 5 is an end view of the VV line cutting portion of FIG.

  As shown in FIG. 4, the natural rotation type mist separator 1 </ b> A has a plurality of blades 21, 21... Attached to the upper portion of the rotation shaft 9 of the natural rotation type mist separator 1 shown in FIG. The rotating shaft 9, that is, the inner drum 3 is configured to rotate, and the other configuration is substantially the same as that of the natural rotating mist separator 1 shown in FIG.

  That is, as shown in FIG. 4, this naturally rotating mist separator 1A has a plurality of blades 21, 21,... Attached to the rotary shaft 9 at a required pitch in the circumferential direction in the vicinity of the exhaust gas inlet 2d of the case body 2a. The exhaust gas introduced into the exhaust gas inlet 2d is blown onto the blades 21, 21,... To rotate the rotary shaft 9, that is, the inner drum 3, in the same direction as the flow direction of the exhaust gas. Further, on the inner surface of the rectangular tube-shaped case main body 2a around the blade 21, rectifying plates 21a and 21a having curved surfaces convex outwardly inside the corner portion are attached, respectively. The flow of exhaust gas blown to ... is rectified to efficiently rotate the blades 21.

  Therefore, according to this natural rotation type mist separator 1A, since the inner drum 3 is also rotated by the blades 21, 21,..., The exhaust gas flows along the inner peripheral surface of the porous outer cylinder 7 of the inner drum 3, The rotational speed can be increased as compared with the natural rotation type mist separator 1 that rotates the porous outer cylinder 7 shown in FIG. For this reason, since the flow velocity of the swirling flow of the exhaust gas can be increased, the centrifugal force generated by the swirling flow can be increased. For this reason, the separation efficiency of the oil mist and dust separated from the exhaust gas by centrifugal force can be improved, and as a result, the collection efficiency of the oil mist and dust can be improved.

  Further, since it is not necessary to provide driving means such as a driving motor for forcibly driving the inner drum 3, it is possible to achieve cost reduction and reduction in size and weight accordingly.

  FIG. 6 is a longitudinal sectional view of a forced rotation type mist separator 1B according to the third embodiment of the present invention. This forced rotation type mist separator 1B is provided with a drive motor 22 for rotating the inner drum 3 in the natural rotation type mist separator 1 shown in FIG. 1 and the like, while a lower bearing 12 shown in FIGS. It is characterized by the omitted points. The other configuration is the same as that of the natural rotation type mist separator 1.

  That is, the forced rotation type mist separator 1B is configured such that the lower end portion of the spindle 11a fixed to the support disk 11 allows the bottom portion 2i of the case body 2a to penetrate liquid-tightly downward in the vertical direction in FIG. The drive motor 22 is coaxially connected to the shaft, and is disposed, for example, below the bottom 2i of the case body 2a. The drive motor 22 is configured to rotate the inner drum 3 at substantially the same speed as the exhaust gas flow rate, and to operate at a speed difference of substantially zero (0) between the inner peripheral surface of the porous outer cylinder 7 and the exhaust gas. .

  Accordingly, the exhaust gas flowing into the inner drum 3, that is, the porous outer cylinder 7 swirls along the inner peripheral surface of the porous outer cylinder 7 and generates vortex flow, and the centrifugal force causes oil mist or Even if the soot dust collides with the inner peripheral surface of the porous outer cylinder 7, the porous outer cylinder 7 rotates at almost the same speed as the flow rate of the exhaust gas, and the difference between the two speeds is almost zero. It can reduce that it reflects in the inner peripheral surface of the outer cylinder 7, and returns in exhaust gas. For this reason, the collection efficiency of oil mist and dust can be improved accordingly.

  Moreover, in the natural rotation type mist separators 1 and 1A shown in FIGS. 1 and 4, the inner drum 3 is rotated by the flow of exhaust gas, so it is necessary to reduce the weight by forming the inner drum 3 from a lightweight material such as resin. However, according to the mist separator 1B according to this embodiment, since the inner drum 3 is forcibly rotated by the drive motor 22, the inner drum 3 is formed of a metal or other heavy material to improve its mechanical strength, The rotation may be stabilized.

  Furthermore, since the inner drum 3 is forcibly rotated by the drive motor 22, the centrifugal force is applied to the exhaust gas by the fins 13, while the pressure loss of the exhaust gas can be reduced.

  FIG. 7 is a longitudinal sectional view of a forced rotation type mist separator 1C according to the fourth embodiment of the present invention. This forced rotation type mist separator 1C is the same as the forced rotation type mist separator 1B shown in FIG. 6 except that an exhaust duct 14X separate from the case 2 is connected to the upper lid 2c of the case 2, and the inside of the exhaust duct 14X is connected. The main feature is that the third exhaust gas flow path 8e in the upper lid 2c is connected to be communicable.

In the middle of the exhaust duct 14X, an air filter cartridge 16 and an exhaust fan 17 are arranged, and the exhaust fan 17 exhausts the case 2, the inner drum 3 and the exhaust duct 14X at, for example, 30 m ³ / mm. It is supposed to do.

  The exhaust duct 14X is configured to be provided with an openable / closable lid 14Xb in at least a part of the accommodating portion 14Xa that accommodates the air filter cartridge 16 so that the air filter cartridge 16 can be appropriately inserted and removed and replaced. Yes.

  FIG. 8 is a longitudinal sectional view of a forced rotation type mist separator 1D according to the fifth embodiment of the present invention. This forced rotation type mist separator 1D replaces the support disk 11 with a detachable connector 23 in the forced rotation type mist separator 1C in which the case 2 and the exhaust duct X shown in FIG. The outer cylinder 8 is characterized in that the outer periphery of the upper end 8c of the inner cylinder 8 is directly supported by the upper bearing 24 so as to be rotatable. The upper bearing 24 is installed on the upper partition plate 2h.

  That is, the drive motor 22 has its rotating shaft 22a detachably connected to the spindle 11a of the support disk 11 by the detachable connector 23. By pulling the inner drum 3 upward in FIG. It is comprised so that it can remove from the rotating shaft 22a so that attachment or detachment is possible.

  According to this forced rotation type mist separator 1D, since the rotation shaft 9 is omitted, the configuration of the inner cylinder 8 can be simplified correspondingly.

  In addition, the porous outer cylinder 7 may be formed such that each small hole 7 c is a tapered hole that gradually decreases in diameter from the inner surface side to the outer surface side of the porous outer tube 7. According to this, the separated substance 5 such as oil mist in the exhaust gas is reflected by the inner surface of the main body case 2a through the small holes 7c by centrifugal force, and again flows back inward through the tapered small holes 7c. Probability can be prevented or reduced. For this reason, it is possible to improve the collection efficiency of the separated matter such as oil mist. The case body 2a may be formed in a cylindrical shape. According to this, when the case main body 2a has a rectangular tube shape, it is not always easy to clean the oil mist and dust adhering to the inner surface of the case. Maintenance such as conversion becomes easy.

The longitudinal cross-sectional view of the natural rotation type mist separator which concerns on the 1st Embodiment of this invention. The end view of the II-II line | wire cutting part of FIG. The end view of the III-III line | wire cutting part of FIG. The longitudinal cross-sectional view of the natural rotation type mist separator which concerns on the 2nd Embodiment of this invention. The end view of the VV line cutting | disconnection part of FIG. The longitudinal cross-sectional view of the forced rotation type mist separator which concerns on the 3rd Embodiment of this invention. The longitudinal cross-sectional view of the forced rotation type mist separator which concerns on the 4th Embodiment of this invention. The longitudinal cross-sectional view of the forced rotation type mist separator which concerns on the 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mist separator 2 Case 2a Case main body 2d Exhaust gas inlet 2e Oil mist storage part 3 Inner drum 5 Separation thing 7 Porous outer cylinder 7a Porous outer cylinder main body 7c Small hole 7d First exhaust gas flow path 8 Inner cylinder 8c Second exhaust gas flow Path 8e Third exhaust gas flow path 14, 14X Exhaust duct 15 Fourth exhaust gas flow path 16 Air filter cartridge 17 Exhaust fan

Claims (6)

A case having a separated substance reservoir for collecting separated substances such as oil mist and dust formed at the exhaust gas inlet and the inner bottom;
A bottomed porous outer cylinder that is rotatably accommodated in the case and includes a first exhaust gas passage communicating with the exhaust gas inlet and a plurality of through holes formed in at least a side surface;
An inner cylinder housed in the porous outer cylinder and having a second exhaust gas flow path formed therein and communicating with the first exhaust gas flow path;
A fin that is disposed in a radial direction in an annular gap between the inner cylinder and the porous outer cylinder, and that connects the inner cylinder and the porous outer cylinder in a radial direction;
An exhaust fan for exhausting exhaust gas in the second exhaust gas flow path of the inner cylinder;
A mist separator characterized by comprising: The mist separator according to claim 1, further comprising a driving device that rotationally drives the porous outer cylinder. 3. The mist separator according to claim 1, wherein a plurality of the fins are arranged at a predetermined interval in a circumferential direction and an axial direction of the porous outer cylinder and the inner cylinder. The mist separator according to any one of claims 1 to 3, wherein the porous outer cylinder and the inner cylinder are detachably accommodated in the case. The drive device includes a coupling mechanism that removably couples the rotary output shaft of the drive motor to the porous outer cylinder.
It has comprised, The mist separator of any one of Claims 2-4 characterized by the above-mentioned. An exhaust passage provided on the outlet side of the second exhaust gas passage so as to be able to communicate and provided with the exhaust fan;
An air filter disposed in the middle of the exhaust path;
The mist separator according to any one of claims 1 to 5, wherein the mist separator is provided.

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