JP5290492B2 - Oil mist removal device - Google Patents

Description

  The present invention relates to an oil mist removing device, and more particularly, to purify air by sucking oil smoke generated by machining or the like together with air by rotation of an impeller and sequentially capturing it using a multistage filter structure. The present invention relates to an oil mist trapping device. In particular, the present invention provides a structure that improves the handleability of a filter cage that allows a front-stage filter to be taken in and out from a side surface of a front casing that is provided upstream of a main casing that houses an impeller.

  An oil mist removing device used for removing dust and oil smoke generated in factories and the like is disclosed in, for example, Japanese Patent Laid-Open No. 10-216437 and Japanese Patent Laid-Open No. 2003-225524, by rotation of an impeller. The sucked air is passed through a filter, and the accompanying oil mist and fine cutting dust are captured.

  The apparatus sucks air containing oil mist in a substantially horizontal direction and primarily removes the oil mist by a planar front-stage filter disposed in a front casing on the upstream side of the impeller. Then, the remaining air mist is finally captured and purified by allowing the suction air that has passed through the impeller chamber to flow inward from the outer surface of the cylindrical rear filter attached to the main casing. In some cases, the air flow may be secondarily purified by the middle filter before the final filter by bending the air flow after passing through the impeller. In any case, a multistage structure filter mechanism is employed.

  The suction air is sequentially filtered by the multi-stage filter structure and released into the atmosphere, while oil mist and dust adhere to the filter layer at each stage. Needless to say, if the amount increases, it will be clogged. As the filter, a non-woven fabric having a certain thickness or a fiber filter having a multiple structure is usually used.

  For example, as shown in FIG. 8, such an oil mist removing device includes a main casing 3 </ b> A housing the impeller 2 and the electric motor 6, and a front casing 3 </ b> B integrated with the main casing 3 </ b> B on the upstream side. Immediately after the suction port 11 of the front casing 3B connected to the air introduction pipe 14, the planar filter 4 having a multilayer structure is in an upright posture, and the main casing 3A having the discharge port 9 for exhaust to the atmosphere surrounds the motor 6. A cylindrical filter 8 having a multi-layer structure is installed in a horizontal posture. The former is exchanged by pulling it to the side perpendicular to the figure, and the latter to the rear, which is the right of the figure.

  That is, since the cylindrical filter 8 is supported by a cylindrical wire cage 42 provided around the electric motor 6, if the rear cover 43 integrated with the discharge port 9 opened to the atmosphere is removed, the tubular filter 8 is taken out rearward in a horizontal posture. be able to. On the other hand, the planar filter 4 is stored in the filter cage 5 and is guided by guide rails 15 (see FIG. 8) extending left and right provided in the front casing 3B by removing one of the side covers 16 shown in FIG. So that it can be carried to the side.

  By adopting such a filter mounting structure, it is very easy to replace the filter in this type of apparatus that is often installed near the wall or installed at a high place directly above the machine tool. In other words, the casing can be easily opened from a horizontal line as long as it approaches, and it is necessary to remove the air introduction pipe (reference numeral 14 in FIG. 8) at the time of forward pulling, which has been indispensable in the past. An operation such as upward pulling in which a stable posture is forced can be avoided, and the burden on maintenance inspection is greatly reduced.

  By the way, the filter cage that holds the multi-layered planar filter is easy to remove and load the filter, does not change the posture of the filter depending on the air flowing during the operation of the impeller, Keep the opening / closing structure simple, and if a collision plate is provided on the front, the dust that has fallen out of the airflow can be collected separately from the trapped mist, making it easy to clean, and the collision plate is stable in the filter cage. Therefore, it is desired to be highly convenient in consideration of being able to be attached and keeping the collision plate out of the way when replacing the filter.

  A filter cage that attempts to satisfy these points as much as possible is disclosed in Japanese Patent Application Laid-Open No. 2003-225524. It is provided with a box-shaped dust receiver 17 (see FIG. 8) that accommodates the dust that has fallen on the collision plate, protruding forward from the lower part of the front of the cage, and the bottom front edge of the dust receiver and the bottom rear edge of the cage are provided. The pair is placed on a pair of front and rear lower guide rails 15 and 15 so that the top front edge and the top rear edge of the cage are along the upper guide rails 15 and 15 to facilitate loading and unloading.

  The cage has a lattice plane as shown in FIG. 10 so as not to hinder the flow of suction air. That is, the top 52t, the side 52s, and the bottom 52b of the cage form a simple panel and surround a multilayer filter (not shown), and the front and rear lattice surfaces 52f and 52r maintain the upright posture of the filter layer. . Among them, the rear lattice 52r is detachably attached to a vertically extending guide rail 53 provided at the rear edge of the side 52s, so that the filter can be replaced from behind the filter cage 52.

  The filter replacement operation may be performed by pulling up the rear lattice 52r from the filter cage 52 drawn out from the front casing 3B shown in FIG. 11, removing the predetermined number of planar filters 4, and inserting a new one. The filter cage 52 loaded with the filter is stored in the front casing 3B, and the side cover 16 is attached to seal the front casing 3B (see FIG. 9). The exchange of the filter itself is performed outside the front casing 3B, and its workability is extremely high.

  As described above, the elevating guide rail 53 that is required to enable the rear lattice 52r to be extracted from the filter cage 52 (see FIG. 10) is formed by simply bending the rear edge of the side panel 52s. This can be realized without increasing the number of parts constituting the. In addition, the filter layer that receives the suction force of the impeller presses the rear grid against the guide rail for raising and lowering. As a result, rattling of the rear grid 52r and noise caused by it are suppressed, enabling stable and quiet operation. To. Since the collision plate 13 (see FIG. 10) is attached to the front lattice 52f integrated with the surrounding panels, the rear lattice 52r can be pulled out independently of it, and the degree of freedom in fixing the collision plate 13 is increased. Can hold.

  By the way, the amount of mist trapped by the planar filter 4 having a multilayer structure often reaches 90%, and the degree of contamination is not the ratio of the cylindrical filter 8 (see FIG. 8). In the case where the rear grid is detachable, if a filter layer with severe dirt is to be replaced, all of the planar filters having a multilayer structure including the filter layer with little dirt must be taken out. When the first layer is peeled off and the second layer is peeled off as necessary, a new layer is stacked and stored in the cage. Lack smoothness. On the other hand, since the front lattice is fixed, it is not easy to take out the dust collected in the dust receiver. In particular, most of the dust adhering to the corners of the boundary between the dust catcher and the front grid is a fine metal piece covered with oil, and it is often necessary to spend a great deal of effort on the stripping work.

Furthermore, if the filter layer is in close contact with or bites into the rear grid by the suction force of the impeller, and the filter bulges out from the eyes of the rear grid, the rear grid is difficult to remove. Since the free thickness of the planar filter layer is given slightly larger than the front and rear dimensions of the filter cage, insert a finger from between the grids when reloading when only one or two upstream layers are replaced. Therefore, it is necessary to secure a fitting space while pushing back the filter to which the oil adheres, and the operation becomes extremely troublesome.
JP-A-10-216437 JP 2003-225524 A

  The present invention has been made in view of the above problems, and its purpose is to make it easy to remove the surface lattice when replacing the filter without excessive adhesion or biting with the filter layer, and to touch the continuous use layer. It is possible to peel off a dirty filter layer to be replaced without fail, or to stack a new layer, to make it easy and smooth to attach the surface grid after replacing the filter, and to adhere to the boundary of the front grid if dust is present. An object of the present invention is to provide an oil mist removing apparatus including a filter cage that realizes reduction of the burden of removing garbage.

  The present invention is housed in a front casing located upstream of an impeller equipped in a main casing for sucking air containing oil mist, and holds a multilayer structure planar filter for collecting oil mist. The filter cage is applied to an oil mist removing device that can be taken in and out on the side of the front casing.

  As shown in FIG. 1, the front surface of the filter cage 5 that holds the multi-layered planar filter 4 at right angles to the flow without obstructing the air flow is provided on the front surface of the filter cage. A front grid 5f that can be extracted along the lifting guide rail 32 formed at the front edge of the side panel 5s is provided. If the front grid 5f is removed, the scraping work of the dust collected immediately below the front grid becomes easy. A dust receiver 17 is provided below the filter cage 5. A collision plate 13 for knocking fine particles accompanying the suction air onto the dust receiver 17 is attached to the front surface of the front lattice 5f. The rear grid 5r provided on the rear surface of the filter cage 5 is fixed integrally with the surrounding panel.

  According to the present invention, the front grid is extracted from the filter cage, but the filter layer tends to be displaced downstream by the suction force of the impeller, so that the adhesion with the front grid is not only weakened, but also the dirt. Even though it is harsh, slippage is promoted by the attached mist, so that the front grid is significantly easier to pull out than when the rear grid is pulled out. By removing the front grating, the most severely dirty front layer filter is positioned in front of the multilayer structure, and it is easy to remove only that layer. If necessary, the second layer can also be easily removed, leaving behind a filter layer that does not need to be replaced.

  Even if the filter layer is replaced, it is only necessary to put a new one on the existing layer, and there is no need to touch the filter other than the replacement. In the filter cage, the backside of the front grid is removed except for the bottom, but cleaning is very easy because it can be removed from the cage. It wo n’t happen. Even if the front filter swells and gets in the way when fitting the front grid, when you put your hand or fingers between the new grid and push it back, it will not get dirty or oil droplets, and you can easily set the front grid be able to.

  The filter cage having the front grid and the rear grid in a fixed state can be easily removed and loaded, and the posture of the filter can be changed by the air flowing during the operation of the impeller. Absent. And it is suitable for holding | maintaining the planar filter of a multilayer structure, and has the structure which improved the handleability of the cage. Since one or two of the filter layers on the upstream side that are markedly soiled are replaced and the downstream layer that is less soiled is used more frequently, the consumption of the filter can be suppressed. If the filter can be easily replaced, it is easy to reduce the load on the motor by suppressing the increase in pressure loss by increasing the frequency of replacement of the foremost clogged surface.

  When removing the front grid, it is slid along the elevating guide rail formed on the front edge of the side panel of the cage, so that the grid can be prevented from being shaken by a simple opening / closing structure. The guide rail can be formed, for example, by bending the side panel, and the number of parts constituting the filter cage can be saved.

  The rear grid is fixed integrally with the surrounding panels, but only needs to be in contact with the filter layer with little dirt, so that the necessity for cleaning is low, and there is no particular problem because it is not removable. For example, even if clogging progresses and a large negative pressure is generated in the impeller chamber, the rear lattice forms a box shape with the cage panel, so it will not be easily deformed, and it will not come off the cage. The shape-retaining property of the filter layer is significantly improved.

  Even if the rear grid bites into the filter layer that is in close contact with the rear surface of the cage due to the suction force, the rear grid will not be removed, so there is no need to watch closely the behavior and deformation of the filter layer located on the downstream side. And inspection work are significantly reduced. In addition, since the filter layer is pressed and pressed against the rear grid by the suction force of the impeller, the force is exerted on almost the entire surface of the rear grid, and the vibration of the grid itself and the generation of noise caused by it are suppressed, and the suction air flow is also stable. Will be.

  Since a collision plate that knocks off the accompanying fine particles from the suction air is attached to the front surface of the front grid, it is possible to collect dust by separating it from the oil mist that passes through the collision plate and facilitates cleaning. The impingement plate increases the surface rigidity of the front grating and maintains the filter holding action, thereby facilitating the reduction in the thickness and weight of the grating. Since the collision plate is integral with the front grid, it does not interfere with the filter replacement work, and the collision plate itself can be easily cleaned. Even if the filter cage is provided with a dust receiver, the front lattice can be removed, so that it is extremely easy to remove dust adhering to the boundary between the dust receiver and the filter layer storage portion.

  Since suction air collides with the collision plate, the dynamic pressure is deformed so as to push the entire surface or a part of the front grid slightly downstream. The grid does not generate unnecessary vibrations such as coming into contact with the filter layer, and does not come off the lifting guide rail.

  Hereinafter, an oil mist removing apparatus according to the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. As mentioned in the prior art section of FIG. 8, the apparatus 1 includes a main casing 3A equipped with an impeller 2 for sucking air containing oil mist, and a front casing 3B located on the upstream side thereof. Provided. In the front casing 3B, a planar filter 4 having a multilayer structure for collecting oil mist is housed. A filter cage 5 is used to hold the filter, and this can be taken in and out on the side of the front casing 3B. Yes. The impeller 2 is a centrifugal type of, for example, a paddle fan type having a horizontal rotation shaft, and filters are arranged on the upstream side and the downstream side thereof to form a multistage filter configuration.

  The above-described main casing 3A includes an impeller 2, an electric motor 6 that drives the impeller 2, a secondary demister 7, a cylindrical filter 8 having a multi-layer structure as a rear-stage filter, and a discharge port 9, and includes an impeller chamber 2R and a filtration chamber 8R. An electric motor housing space / purified air passage 6R is defined. The front casing 3B is fastened to the fan casing 3A with bolts 10 and 10 in a manner described later, and is usually integrated. This includes a suction port 11, a filter cage 5, and a primary demister 12, and a dust removal space 13R, a filtration space 5R, and a trapping oil dripping space 12R are secured side by side in the axial direction.

  With such a structure, the air taken in through the air introduction pipe 14 such as a bellows type duct is sucked in a substantially horizontal direction by the rotation of the impeller 2 in the main casing 3A. From the flow, oil mist is primarily collected by the multi-layered planar filter 4 arranged in the front casing 3B, and from the air passing through the impeller chamber 2R to the rear part of the main casing 3A, a horizontal tube is installed. The residual oil mist is secondarily removed by the filter 8 so that the oil mist can be captured and purified from the suction air.

  The planar filter 4 is a non-woven fabric made of polyester fiber and the like, and a number of sheets are housed in a filter cage 5 that can be taken in and out sideways along guide rails 15 and 15 that extend to the left and right provided in the front casing. . The guide rail 15 is, for example, a sash having a stepped cross section, and the filter cage has a casing described later. In addition, since the front casing 3B is a side opening type, side covers 16 and 16 for closing the front casing 3B are attached to the left and right.

  Referring to FIG. 2, a collision plate 13 for knocking off dust and fine particles accompanying the air flow is attached to the center portion of the front surface of the filter cage 5 via a stay 13a. Below that, a box-shaped dust receiver 17 is provided for storing dust dropped by the collision plate. This box projects forward from the lower part of the front surface of the cage and is formed integrally with the filter cage. The filter cage 5 includes a top panel 5t, a side panel 5s, a bottom panel 5b, a rear lattice 5r integrated therewith, a front lattice 5f that is detachably attached to the front edge of the side panel, and the dust receiver 17 described above. One housing for holding the planar filter 4 (see FIG. 8) is formed.

  More specifically, as shown in FIG. 3, the front casing 3B is in the form of a combination of several boxes. This comprises a front body 18, a rear body 19 and two side covers 16, 16. The side cover can be removed by unscrewing the clamp fitting 20, but the front body 18 and the rear body 19 are assembled and integrated by welding or the like.

The front casing 3B stores the filter cage 5 in which the planar filter 4 is housed, but consideration is given so that it can be easily put in and out. That is, one guide rail 15U ₁ and 15L ₁ is fixed to the front body 18 in the vertical direction. The rail 15U ₁ guides the upper front edge of the filter cage 5, and the rail 15L ₁ is arranged so that the lower front edge of the dust receiver 17 can be mounted. In addition, the round opening in the figure is the suction port 11 described above, and the inclined plate below it is a guide plate 21 for guiding the cutting powder detached from the suction air to the dust receiver 17.

The rear body 19 is also provided with guide rails 15U ₂ and 15L ₂ . The rail 15U ₂ guides the upper rear edge of the filter cage 5, and the rail 15L ₂ is arranged so that the lower rear edge can be mounted. When this rear body 19 is integrated with the above-described front body 18 as shown in the figure, the portion surrounded by the guide rails 15U ₁ , 15U ₂ , 15L ₂ , 15L ₁ forms the filter cage insertion / removal opening 22. In addition, 23 in the figure is a round opening for sending air to the back main casing (not shown).

  As shown in FIG. 8, the front casing 3B has a collection oil dropping space 12R in which the primary demister 12 can be installed behind the position in which the filter cage 5 is stored. This demister, like the secondary demister 7 provided in the main casing 3A, is intended to significantly reduce the filtration burden on the cylindrical filter 8 by suppressing the scattering of the growing oil droplets downstream. Is. The structure is such that, for example, a large number of aluminum wires 24 are lined up and down, and appropriate portions are integrally bound with a wire by hitting a metal mesh 25 from the front and back to form a substantially mat shape. The dense aluminum wires that overlap in the flow direction capture the oil droplets that have flown, and guide the oil droplets to the lower portion of the front casing 3B through the aluminum wires that extend vertically.

The primary demister 12 has a front surface area that is substantially the same size as the planar filter 4, and guide rails 15U ₂ and 15L ₂ that guide the back surface of the filter cage 5 are projected rearward as shown in FIG. If the crosspieces 26U and 26L are formed and placed on the crosspieces 26U and 26L, the rear body 19 can have a simple structure with a small number of parts. In addition, protrusions 27U and 27L are provided on the rear edges of the respective mounting bars, and if the hook 27S is attached to the inner surface of the side panel 19s of the rear body 19, the rearward displacement of the primary demister is prevented, and the filter・ Stable demister structure.

  The side cover 16 is a lid for keeping the airtightness of the front casing after the filter cage 5 is put in the front casing 3B. This does not necessarily have to be left and right, but it goes without saying that the left and right pairs as shown in the figure can be used regardless of which one faces the wall. The cover may have a double door structure using a hinge, but in this example, the entire cover can be fixed and removed using the clamp fitting 20.

  In addition, a claw body 28 (see FIG. 9) that protrudes to the front casing side is provided so that the cover does not fall off immediately when the clamp 20 is released. Therefore, as shown in FIG. 3, an insertion hole 29 is formed in the side wall 19 s of the rear body 19 so that it can be engaged. If there is the claw body, the positioning operation when the side cover 16 is applied to the front casing 3B is also helped. Since the side cover 16 needs to seal the front casing 3B, a packing material is fitted into the inner periphery of the cover.

  Next, the filter cage 5 that houses the planar filter will be described. The planar filter 4 is a multilayer filter structure having a planar shape as shown in FIG. Each of the filters is a polyester fiber mat 4A. For example, oil drops are allowed to flow down between two layers of front and rear filter mats, and oil droplets captured and aggregated in the front two layers cannot be transferred to the rear two layers. A rhombus space net 4B is interposed.

  The filter cage 5 that houses the planar filter 4 is formed of a front lattice 5f shown in FIG. 2 and a rear lattice 5r shown in FIG. Each of them is, for example, a metal panel, but the front grid has vertical and horizontal bars and has an air inflow opening 30 (see FIG. 2), and the rear grid 5r also has an air outflow opening 31 and is a planar filter. It functions to hold down. In this example, the rear grid 5r is fixed to the surrounding top 5t, side 5s, and bottom 5b in an integrated manner, but the front grid 5f is removably attached to the front edge of the side panel 5s. It is done.

  That is, the bent portion 32 shown in the enlarged view in the broken-line circle of FIG. 4 is formed at the front edge portion of the side panel 5s, and can be dropped into the gap 33 from above as shown in FIG. With such a configuration, air is circulated while holding the planar filter between the front lattice 5f and the rear lattice 5r, and the stability of the planar filter is enhanced. The filter cage 5 holds the planar filter 4 having a multilayer structure so as to be perpendicular to the flow without obstructing the flow of air, and its front lattice 5f is an elevating guide rail formed at the front edge of the side panel 5s. 32 can be easily extracted upward.

  The filter cage 5 having the front grid 5f that can be freely inserted and removed and the rear grid 5r that is placed in a fixed state is easy to remove and load the filter, and the posture of the filter is changed by the air flowing during the operation of the impeller. Without changing, it is suitable to hold a planar filter having a multilayer structure, and has a structure in which handling of the cage is improved.

  As described above, the front plate of the front grid 5f is provided with the collision plate 13 for knocking the accompanying fine particles from the suction air, so that it can be separated from the oil mist passing through the collision plate and collected. It becomes easy. The collision plate 13 also acts to increase the surface rigidity of the front grating, and promotes a reduction in the thickness and weight of the grating while maintaining the filter holding function. Since the collision plate is integral with the front grid, it does not interfere with the filter replacement work, and the collision plate itself can be easily cleaned.

  Since the suction air collides with the collision plate, the dynamic pressure pushes the substantially central portion of the front grating slightly downstream, and the unnecessary vibration is prevented by bringing the grating into contact with the filter layer. Further, it also acts to be held in the guide rail 32 for raising and lowering. Incidentally, if the angle member 34 is fixed to the downstream side of the elevating guide rail 32 to form the groove 33 as shown in the enlarged portion in FIG. 4, the operation of lowering the front lattice becomes even easier. . Note that the edge of the top panel 5t is not covered immediately above the elevating guide rail 32 in order to put in and out the front grid.

  In the filter cage 5 that can hold the planar filter in this way, a recess 35 (see FIG. 4) is formed in the bottom layer 5b below the filter layer storage portion, that is, the filtration space 5R. A hole 36 is provided. In order to avoid the filter cage 5 from being difficult to be pulled out from the front casing 3B due to the presence of the recess, the side panel 19s of the rear body 19 has a notch 37 near the boundary with the front body 18 as shown in FIG. (See also FIG. 8).

  If the oil drain hole 36 is provided, oil drainage from the filter cage 5 is extremely improved. When the filter cage is pulled out from the front casing 3B, the amount of oil droplets propagating on the lower surface of the cage and the spreading of the oil film can be reduced, so that oil contamination during filter replacement is suppressed as much as possible. In the example of FIG. 4, two places are provided, but the number is appropriately selected. In any case, the width of the notches 37 (see FIG. 3) can be made as small as possible by arranging them in a horizontal row. By the way, if a small rubber plate is attached to the notch (not shown), it can function as an oil drain scraper at the time of pulling out, and oil scattering can be further reduced.

According to the oil mist removing apparatus configured as described above, it is possible to assemble as follows and to purify it by flowing air. First, the front casing 3B integrated as shown in FIG. 3 is bolted to the main casing 3A shown in FIG. 8 with a packing (not shown) interposed therebetween. Bolts 10 are fixed in advance to the front plate 38 of the main casing 3A by welding or the like, and the threaded portions are inserted into the fastening holes 39 shown in FIG. 3, and are guided by the guide rails 15U ₁ , 15U ₂ , 15L ₂ , 15L ₁ . What is necessary is just to hang a nut by putting a hand etc. from the enclosed opening 22 for filter cage insertion.

The primary demister 12 (see FIG. 8) is inserted into the front casing 3B from the filter cage insertion / removal opening 22 and is placed on the mounting rails 26U and 26L of the guide rails 15U ₂ and 15L ₂ . It is pushed downstream until it hits the protrusions 27U, 27L and the hook 27S, and an appropriate number of bars 40 for preventing the front slip are set up on the front surface portion. The rod is supported by the enlarged diameter portion 40a when the lower end is dropped into the hole of the mounting bar 26L after the upper end is inserted deeply into the hole of the mounting bar 26U from below.

  On the other hand, in the filter cage 5, the front grid may be removed as shown in FIG. 4 to store a predetermined number of planar filters 4, and the front grid 5f may be lowered as shown in FIG. When the front grid is fitted, the frontmost filter swells up and down, but if you put your hands or fingers between the grids and push them back gently, you can easily set the front grid. Such a filter cage 5 is stored in the front casing 3B, side covers 16 and 16 are attached as shown in FIG. 9, and the front casing 3B is sealed.

  Incidentally, in the main casing 3A of FIG. 8, the mat of the secondary demister 7 that is substantially donut-shaped but is divided into, for example, two left and right, extends along the partition wall 41 that defines the impeller chamber 2R and the filtration chamber 8R. Can be installed. And the cylindrical filter 8 is engage | inserted by the outer periphery of the wire cage 42 which covers the circumference | surroundings of the electric motor 6 from back. Finally, the rear cover 43 with the discharge port 9 is put on and fixed with the clamp fitting 44.

A duct (air introduction pipe 14) for taking in air from a place where oil smoke is generated is connected to the suction port 11 as shown in FIG. 8 by arranging the apparatus directly above the machine tool. When the electric motor 6 is driven, the impeller 2 rotates and air is introduced into the front casing 3B. The dust accompanying the suction air hits the collision plate 13 tilted forward to make it easy to fall, where it stalls and enters the dust receiver 17. On the other hand, the oil mist enters the filter cage 5 and is captured by the planar filter 4. The oil mist captured by the two upstream filters 4A ₁ 4A ₂ shown in FIG. 1 grows into oil droplets in contact with the subsequent captured oil mist. Incidentally, if the cross rail 5a is formed at the lowermost part of the front lattice 5f, it is possible to prevent dust from entering the filter layer. If the front grid 5f is removed, the scraping work of the dust collected at the boundary portion between the dust receiver and the filter layer storage section, that is, directly below the front grid, becomes extremely easy.

  In the filter, the oil droplets collected are not easily flowed down due to surface tension or the like, but the grown oil droplets are often peeled off by wind pressure and pushed downstream. Referring to FIG. 8, when the pushed oil droplet reaches rhombus space net 4 </ b> B, it adheres to the rhombus space net 4 </ b> B. The oil droplets accumulate in the lower part of the planar filter 4 but are dropped into the oil sump 45 of the front casing 3B through the oil drain hole 36 (see FIG. 1). Although the dust receiver 17 is provided, the amount of dust entering the oil sump is extremely small, and the oil is smoothly discharged with almost no clogging in the oil drain pipe 46.

The rhombus space net 4B has a thickness that also functions as a filter spacer, and reduces air blockage in the planar filter 4. The promotion of the drop using the rhombus route contributes to the improvement of the filtration performance on the downstream side and the reduction of the filter replacement frequency. The air that has passed through the rhombus space net 4B enters the downstream filters 4A ₃ and 4A ₄ (see FIG. 1), and oil mist is further captured.

  When the air that has entered the primary demister 12 passes through it, the accompanying oil droplets adhere to the aluminum wire, and the oil droplets are promoted again. Air enters the impeller chamber 2R through the opening 23 (see FIG. 3) of the front casing 3B. At this point, oil mist and growth oil droplets have been halved, so oil and fine dust adhering to the blades And there is no imbalance in the rotation of the impeller. Of course, since the growth oil droplets are prevented from entering the impeller, the filtration burden on the cylindrical filter is greatly reduced.

  The air pressurized in the impeller chamber 2R flows as indicated by an arrow 47 (see FIG. 8) and enters the secondary demister 7 where it is further deoiled. Needless to say, if the oil droplets are removed in this way, the filtration burden on the cylindrical filter 8 is further reduced. When it reaches the filtration chamber 8R, it passes through the cylindrical filter 8 as indicated by an arrow 48 and proceeds to the motor housing space / purified air passage 6R, and the purified air is discharged into the atmosphere through the discharge port 9. The structure of the cylindrical filter has been introduced in Japanese Patent Application Laid-Open No. 10-216437 listed in the section of the prior art, so the description thereof is omitted here. However, a planar filter is wound around and used as a cylindrical filter. There is no problem.

  The oil droplets separated from the secondary demister 7 and the cylindrical filter 8 are collected in the oil sump 49 at the bottom of the main casing 3A and discharged from the oil drain pipe 50. On the other hand, the side cover 16 is opened when the oil contamination of the planar filter 4 becomes severe, and the filter cage 5 is taken out. The filter layer tends to displace to the downstream side due to the suction force of the impeller 2 during operation. If even a slight gap is generated between the filter layer and the filter layer, the adhesion state is reduced, and oil droplets adhering to the filter layer are reduced. Since the sliding with the front grid 5f is aided, the front grid can be easily extracted as compared with the case where the rear grid is extracted.

Increasing the front grid 5f as shown in FIG. 1, the most severe forefront layer filter 4A ₁ of dirt located in front face of the multilayer structure, peeled away only the layer. If necessary, the second layer can be removed and a new filter layer is applied to the underlying filter layer that does not need to be replaced. It is very easy to remove and load the filter layer to be exchanged. In this way, it is only necessary to stack a new object so as to be applied to the existing layer. At this time, it is not necessary to touch a filter other than the replacement part, so that the replacement work is significantly facilitated.

  Since one or two of the upstream filter layers that are highly contaminated can be exchanged and the downstream layer with less contamination can be used continuously, the consumption of the filter can be reduced. If the filter can be easily replaced, it is easy to reduce the load on the motor by suppressing the increase in pressure loss by increasing the frequency of replacement of the foremost clogged surface.

  When removing the front grid 5f, the front grid 5f is moved along the elevating guide rail 32 formed on the front edge of the side panel of the cage. The guide rail may be formed, for example, by attaching a sash or the like, but can also be formed by simply bending the side panel. The latter case is advantageous in that the number of parts constituting the filter cage is not increased.

  The rear grid 5r is integrated with the surrounding panel, but only touches the filter layer with little dirt, and the necessity for cleaning is often low, and there is no particular problem caused by the fact that it is not removable. For example, even if clogging progresses and a large negative pressure is generated in the impeller chamber, the rear lattice forms a box shape with the cage panel, so it will not be easily deformed, and it will not come off the cage. The shape retention by the cage of the layer is dramatically increased.

  Even if the rear grid bites into the filter layer that is in close contact with the rear surface of the cage due to the suction force, the rear grid is not removed, so there is no need to closely observe the behavior and deformation of the filter layer located on the downstream side. The burden of work such as inspection is significantly reduced. Since the filter layer is pressed and pressed against the rear grid by the suction force of the impeller, the rear grid itself can be prevented from vibrating, no noise is caused, and the flow of the suction air is stabilized.

  In the filter cage 5, the dirt becomes more severe on the back surface of the front grid 5 f except for the bottom 5 b, but it can be removed from the cage, so that cleaning is very simple. It is also possible to avoid getting dirty early.

When the filter layer is replaced, the front grid is lowered. Even if the replaced frontmost filter layer 4A ₁ is swollen, the front grid can be easily set by inserting and pushing back between the grids. can do. Since it does not touch the filter layer for continuous use, the hands will not get dirty or spilled. If the filter cage 5 is returned to the front casing 3B as shown in FIG. 3, the operation can be resumed immediately. It should be noted that the demister has good oil drainage in both the primary and secondary, and does not need to be cleaned or replaced on a daily basis.

  By the way, if you cover the front filter with a slightly deformable temporary holding panel just before inserting the front grid and push the front grid to the upstream side, the bulge of the front grid will prevent the front grid from sliding Less. When the front grid is set, the filter cage can be circulated by removing the panel.

  This will be described with reference to FIG. The temporary pressing panel 51 is hung on the downstream side of the angle member 34 so as to face the front surface of the frontmost filter layer (not shown). If the temporary holding panel 51 is of a quality that can be bent as shown in the drawing, the frontmost filter layer can be covered completely as shown in FIG. The front grid 5f is inserted into the gap 33 between the guide rail 32 and the angle member 34. In this operation, the front grid is lowered so as to rub against the temporary holding panel 51, but the filter layer does not protrude. It acts to push the filter layer just replaced to the downstream side. Finally, if the temporary pressing panel 51 is removed as shown in FIG. 7, the original shape is restored.

  Note that when the temporary holding panel 51 is used, the angle member 34 is not necessarily required if there is enough clearance so that the panel 51 and the front lattice 5f can be inserted into the elevating guide rail 32. As shown in FIG. 6, the top panel 5t should not cover the upper ends of the elevating guide rail 32 and the angle member 34. However, if the temporary pressing panel 51 is easy to bend, the elevating guide The shape in which only the upper part of the rail 32 is open may be sufficient.

  As can be seen from the above description, according to the present apparatus, when dust is previously removed from the air flowing into the planar filter, the dust can be stored in the dust receiver. Since this box is located on the upstream side of the planar filter, oil droplets of the collected oil mist are not mixed and can be easily removed when replacing the filter. Dust is less likely to be scattered in the front casing, which not only significantly reduces the burden of cleaning in the casing, but also allows the filter cage containing the planar filter to be always exchanged smoothly.

  The collected oil discharged from the oil drain pipe has a very small amount of dust, and therefore the post-treatment of the waste oil is simplified. The filter cage is pulled out to the side along the guide rail, and can be installed in an unobtrusive location such as near the building wall. Needless to say, the larger the device is, the more convenient the filter replacement is, and the greater the degree of freedom in layout of this device.

The perspective view of an example of the filter cage used for the oil mist removal apparatus which concerns on this invention. The perspective view of an example of the filter cage of the state which lowered the front lattice. The perspective view which showed the mode when a filter cage was put in and out of a front casing. The state which stores a planar filter in a filter cage, and the expansion perspective view of the guide rail part for raising / lowering for a front grating | lattice. The perspective view which showed the attachment point of the temporary holding panel which makes a front lattice slide smoothly. The perspective view which showed a mode that the front grating | lattice was lowered | hung on the front surface of a temporary holding panel. The perspective view of the state which pulled out the temporary holding panel from the back of a front lattice. The whole longitudinal cross-sectional view of the oil mist removal apparatus with which the filter cage was mounted. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8. The perspective view of a mode that a rear lattice is taken in and out from a filter cage. The perspective view which showed the mode when a rear lattice raising / lowering filter cage was withdrawn / inserted in a front casing.

Explanation of symbols

1 ... oil mist removing apparatus, 2 ... impellers, 3A ... main casing, 3B ... front casing, 4 ... planar filter, 4A, 4A ₁ to 4A ₄ ... mat (filter layer), 5 ... filter cage, 5f ... Front Lattice, 5s ... side panel, 13 ... collision plate, 17 ... dust receiver, 32 ... elevating guide rail.

Claims (1)

A filter cage that is housed in a front casing located upstream of an impeller installed in the main casing to suck air containing oil mist and holds a multi-layer planar filter for collecting oil mist. In the oil mist removing device that can be taken in and out on the side of the filter casing,
The front surface of the filter cage that holds the multi-layered planar filter at right angles to the flow without obstructing the air flow is provided along an elevating guide rail formed on the front edge of the side panel of the filter cage. Front grid that can be removed from the filter cage
If the front grid is removed, a dust receiver that facilitates scraping of the dust collected directly under the front grid is provided below the filter cage,
A collision plate that knocks fine particles accompanying the suction air onto the dust receiver is attached to the front surface of the front grid,
An oil mist removing device, wherein a rear grid provided on a rear surface of the filter cage is fixed integrally with a surrounding panel.

Images