JP2009262063A - Filter structure in cooking-oil filtering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter structure in a filtering device in which the oxidation and deterioration of cooking oil are drastically improved by a relatively simple filtering means and in which the cooking oil is repeatedly used by eliminating various impurities. <P>SOLUTION: In the filtering device provided with an oil tank having an oil discharge opening at an inner bottom part, the filter structure in the cooking-oil filtering device is designed by a strainer forming a space part on a lower surface part and suitable for the oil discharge opening through an engaging means, and a formed filter designing a porous structure by mixing fibers and adsorbing agent, made of a predetermined-shaped formed body having a recessed part corresponding to the upper surface shape of the strainer on the lower surface, and suitable for the strainer. A flat plate filter made by packing the adsorbing agent into a bag body covering totally the upper surface of the formed filter is installed and a filter pressing is installed on its peripheral end part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filter structure used in a filtration device for recycling waste oil of edible oil.

  Today, in a restaurant industry such as a family restaurant or a kitchen such as a side dish shop, tempura and fried food are used to consume a large amount of cooking oil. This edible oil is not suitable for edible use because it oxidizes, deteriorates or becomes colored with repeated use and time, generates impurities such as peroxides, and produces a bad odor. However, it is uneconomical to dispose of such deteriorated edible oil every several cooking times, and also causes environmental pollution. For this reason, usually, a measure has been taken in which an edible oil filtration device is disposed in the vicinity of the fryer, the used edible oil is circulated and repeatedly used.

  In a general edible oil filtration device, edible oil discharged from a fryer is stored in an oil tank, and one or more filtering means (filters, etc.) are installed in the tank and filtered by the filtering means. The edible oil is returned to the fryer by a pump or the like.

  And as this filtration means, for example, in the edible oil filtration apparatus of patent document 1, the filter formed by bagging powder or a granular filter agent is arrange | positioned in the inner bottom face of the tank. Moreover, in the circulation filtration device for a flyer disclosed in Patent Document 2, a superposition filtration structure formed by stacking a metal mesh net, a metal filter paper restraint, a filter paper, a metal mesh net, and a filter cloth is detachably provided.

JP 2001-190906 A JP 2004-267432 A

  By the way, in the said conventional filtration apparatus, since the filtration means in patent document 1 is what packed the single filter agent, the effect of filtration was limited by the function of the filter agent, The oxidation of edible oil and various impurities could not be sufficiently removed. In addition, since the filter medium is densely packed in the bag, edible oil is difficult to circulate, and it takes time for filtration, and may pass through without being treated with the filter medium. Moreover, even if it exists in the filtration means in patent document 2, although it has piled up several filtration means, since it filters with a thin filter paper, a mesh net | network, and a filter cloth, there is still a point with insufficient filtration performance. It was left.

  The present invention solves such a conventional problem, and in a conventionally used filtration apparatus, by using a relatively simple filtration means, the oxidation and deterioration of edible oil are greatly improved, The present invention proposes a filter structure that removes various impurities and allows edible oil to be used repeatedly.

  In order to solve the above-described problem, the present invention provides, as an invention according to claim 1, a filtration device including an oil tank having an oil discharge port on an inner bottom portion, and a space portion is formed on a lower surface, and the above-described method is performed via an engaging means. A strainer that is engaged with the oil discharge port, and is formed of a molded body having a predetermined shape formed on the lower surface corresponding to the upper surface shape of the strainer, in which a fiber and an adsorbent are mixed to form a porous structure, and is fitted to the strainer. The means for constituting the filter structure in the edible oil filtration device was adopted by the molded filter to be used.

  Further, as an invention according to claim 2, in the invention according to claim 1, a flat plate filter that covers the entire upper surface of the molded filter and stuffs an adsorbent into the bag body is further provided on the peripheral portion. A means of providing a filter press was adopted.

  Further, as a third aspect of the invention, in the filtration apparatus including an oil tank having an oil discharge port on the inner bottom portion, a strainer that forms a space portion on the lower surface and is engaged with the oil discharge port via an engagement means; A flat plate filter that covers the entire surface of the strainer and is formed of a molded body that is formed into a porous structure by mixing fibers and adsorbents, and a press ring that is placed near the periphery of the flat plate filter, A means for constituting a filter structure in an edible oil filtration device was adopted by a pressing plate made of punching metal or the like provided to cover the pressing ring.

  In these inventions, by providing a space around the oil discharge port, a negative pressure is applied evenly when sucked by the pump, and the edible oil is evenly dispersed and passes through the molded filter. Moreover, impurities are removed by passing through filters having respective characteristics, and the effects of decolorization and deodorization are exhibited.

  Moreover, as invention which concerns on Claim 4, in the filtration apparatus provided with the oil tank which has an oil discharge port in an inner bottom part, the strainer provided covering the said oil discharge port, a fiber and an adsorbent are mixed, and it comprises in a porous structure The filter structure in the edible oil filtration device is composed of a flat plate formed filter that is formed into a flat plate and covers the entire surface of the strainer, and a spiral retaining ring that is placed on the entire upper surface of the flat plate filter. Adopted a means to do.

  And as invention which concerns on Claim 5, the means of providing the rod rod constructed in order to suppress the jump of the said spiral shaped holding | suppressing ring was employ | adopted.

  In these inventions, even if the edible oil is filtered by its own weight, the inside of the flat plate filter is surely dispersed and allowed to pass evenly.

  Further, as the invention according to claim 6, in the invention according to claims 1 to 3, a means is adopted in which the engaging means is a leaf spring bent in a dogleg shape provided on the lower surface of the strainer. did.

  Furthermore, as an invention according to claim 7, in a filtration device including an oil tank having an oil discharge port on an inner bottom portion, a strainer provided on the lower surface so as to cover the oil discharge port, and a fiber and an adsorbent are mixed. And a molded filter that is formed into a porous structure and is formed of a molded body having a predetermined shape having a concave portion corresponding to the upper surface shape of the strainer on the lower surface, and is closely fitted to the inner bottom surface of the oil tank and is fitted to the strainer. A press ring placed on the periphery of the molded filter, and a flat plate filter in which an adsorbent is packed in the bag body, covering the molded filter and the press ring entirely, and closely fitting along the inner surface of the oil tank And the filter structure in an edible oil filtration apparatus was employ | adopted by the holding net | network mounted on this flat plate filter.

  With such a filter structure, edible oil passes through each filter densely laid in the oil tank while being evenly distributed, and exhibits an efficient filtering action.

  The invention according to claims 1 to 3 is a strainer that is engaged with the oil discharge port and forms a space of a certain size around the oil discharge port. The edible oil that penetrates into the molded filter can be evenly dispersed and pass through the molded filter, so that the edible oil can be efficiently filtered using the entire molded filter. Is now possible.

  Even if the shape and configuration of the filter are changed, the characteristics of the filter can be sufficiently exhibited, and impurities can be efficiently removed, decolorized, deodorized, and the like.

  Further, in the inventions according to claims 4 and 5, even when the edible oil is filtered by its own weight, the entire flat plate filter is pressed by the spiral holding ring, and the edible oil is evenly distributed and passes through the filter. Thus, high filtration efficiency can be obtained.

  Furthermore, in the invention according to claim 7, a space is formed around the oil discharge port of the oil tank, and a molded filter and a flat filter are laid densely on the inner bottom surface. In this case, the edible oil can surely permeate and pass through two types of filters having different characteristics, and can be filtered efficiently.

  And by adopting the above filter structure in the filtration device, it is possible to cope with any oil and its discharge amount from about 3 liters to 1000 liters. In this case, a natural precipitation filtration system is used from 3 liters to 10 liters, and in the case of more industrial waste oil, a precipitation filtration system with centrifugal separation is employed.

  In addition, if it is repeatedly filtered every day, the oil does not deteriorate and lasts as long as new oil, which is very economical.

  Furthermore, it is possible to reuse waste oil (which has finally lost its weight) as biofuel. By filtering waste oil, it becomes new energy, such as fuel for diesel vehicles, and is more economical.

  Further, the filtering work is extremely simple, and the workability is high and efficient.

  Furthermore, various excellent effects can be expected, such as a new energy as artificial coal can be expected by crushing, mixing and filtering the waste filter and wood chips after filtration.

  Hereinafter, some preferred embodiments of a filter structure in an edible oil filtration apparatus according to the present invention will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 shows a first embodiment. In FIG. 1, (A) is a central longitudinal sectional view of the present filter structure, and (B) is an exploded view thereof.

  In FIG. 1, reference numeral 1 denotes an oil tank which opens below a fryer oil discharge port (not shown) and stores used cooking oil. An oil discharge port 2 is provided at the center of the inner bottom of the oil tank 1. An appropriate hose (not shown) is connected to the oil outlet, and edible oil filtered and purified by the filter structure described below is sucked by a pump (not shown) and returned to the fryer or stored separately. It is something to keep.

  A strainer 3 is attached so as to cover the oil discharge port 2 via a fixing plate spring 4 provided on the lower surface. That is, for example, the strainer 3 is fixed to the oil discharge port 2 by inserting and engaging the fixing plate spring 4 bent in a U-shape into the oil discharge port 2. The strainer 3 is formed in a bowl shape opened on the lower surface by a punching metal having a large number of holes or a mesh net, and allows a sufficient amount of edible oil to pass therethrough, and a space portion having a predetermined size around the oil discharge port 2. 5 is formed. The fixing leaf spring 4 is not limited to the shape shown in the figure, and as an engaging means, the fixing leaf spring 4 is elastically engaged with the oil discharge port 2 to ensure that the strainer 3 does not move. Anything that can be fixed is acceptable.

  Reference numeral 6 denotes a molded filter, which is formed of a molded body having a predetermined thickness having a recess 6a formed in a bowl shape corresponding to the shape of the upper surface of the strainer 3 at least on the lower surface thereof, and is fitted and fixed over the strainer 3. Is. The molded filter 6 is formed into a molded body having a porous structure by mixing appropriate fibers and adsorbents, for example, and has various effects such as decolorization and deodorization while removing impurities.

  The molded filter 6 will be further described. Specifically, for example, an edible oil filtration filter as disclosed in Japanese Patent Application Laid-Open No. 2005-161295 can be employed. This filter for filtration is invented by the inventors of the present application. That is, fibers such as pulp and adsorbents such as activated carbon powder are stirred and mixed in water, the mixture is placed in a mold and compression molded, and then dried and solidified to form a molded body having a predetermined shape having a porous structure. Is. When used edible oil is passed through the molded filter 6, the edible oil passes between the fibers satisfactorily due to the porous structure of the fiber, and impurities such as tempura and bread crumbs contained in the edible oil are contained. Can be adsorbed and removed by cellulose fibers of pulp, and the activated charcoal powder uniformly dispersed and adhered to the fibers can effectively decolorize browned edible oil and can also effectively adsorb and deodorize odorous substances. It is. In addition, in order to set it as a porous structure, a rayon fiber etc. may be further added to the said pulp, and it may become easy to form a space | gap. And since it is a cartridge type molded body molded and solidified into a predetermined shape, replacement and replacement can be performed very easily.

  Next, the operation of the filter structure having the above configuration will be described. In use, used cooking oil is stored in the oil tank 1 from the oil discharge port of the fryer, and the oil discharge port 2 on the lower surface of the oil tank 1 is used. Connect the hose and suck with the pump. At this time, edible oil permeates into the molded filter 6 by its own weight, but furthermore, since the space portion 5 is formed around the oil discharge port 2 of the strainer 3, a negative pressure is evenly distributed over the entire space portion 5. Since it is applied, it penetrates the molded filter 6 even by this negative pressure. In this way, used cooking oil in the oil tank permeates while being uniformly dispersed over the entire surface in the order of the molded filter 6 and the strainer 3, and is filtered while adsorbing impurities, coloring, odors and the like. Become. In other words, the entire molded filter 6 is used for filtration with high filtration efficiency. And the edible oil refine | purified by filtration is circulated to a fryer through a hose, and is provided for reuse. At this time, the molded filter 6 has a recess 6a having a shape corresponding to the shape of the upper surface of the strainer 3, and covers the entire strainer 3. Therefore, the used cooking oil always passes through the molded filter 6 and passes through the strainer. To 3. Therefore, used cooking oil is not discharged as it is.

(Second Embodiment)
Next, a second embodiment of the filter structure according to the present invention will be described with reference to FIG. 2A is a central longitudinal sectional view of the filter structure, and FIG. 2B is an exploded view thereof.

  The second embodiment shown in FIG. 2 shows a configuration in which another filter is added to the first embodiment. The same components as in FIG. 1 are described with the same reference numerals. In FIG. 2, 1 is an oil tank, and 2 is an oil discharge port provided at the center of the inner bottom. Reference numeral 3 denotes a strainer which is attached to the lower surface via a fixing plate spring 4 so as to cover the oil discharge port 2 and is formed into a bowl shape which opens to the lower surface by a punching metal or the like. A space 5 having a size of 5 mm is formed. 6 is a molded filter formed into a molded body having a porous structure by mixing appropriate fibers and adsorbents, for example, and is formed at least on the lower surface thereof into a bowl shape corresponding to the upper surface shape of the strainer 3. It consists of a molded body having a recess 6a and is fitted and fixed over the strainer 3.

  Next, 7 is a flat filter, which is formed into a thin plate by packing a predetermined adsorbent into a bag body, has flexibility, and covers the entire surface along the upper surface of the molded filter 6. It is provided as described above. As the adsorbent, conventionally used powders such as activated clay, silicon, silica gel, and magnesium oxide are used. These adsorbents can also provide decolorization and deodorization effects. Reference numeral 8 denotes a ring-shaped filter retainer provided on the peripheral edge of the flat filter 7 in order to prevent the flat filter 7 from being lifted or moved inadvertently, and 8a is a handle provided on the upper edge thereof. is there. By the filter holder 8, the molded filter 6 and the flat filter 7 are stacked in close contact with each other, and a larger filtering effect can be obtained by stacking two types of filters.

  That is, when sucked through a pump (not shown) connected to the oil discharge port 2 as in the first embodiment, the used cooking oil in the oil tank 1 becomes the flat filter 7, the molded filter 6, and the strainer 3. In this order, they are uniformly dispersed and penetrated over the entire surface, and are filtered while adsorbing impurities, coloring, odors and the like. The activated clay contained in the flat filter 7 mainly performs a decoloring action, and the molded filter 6 adsorbs impurities to perform a decoloring and deodorizing action. Thus, by laminating and using two types of filters having different characteristics, the filtration efficiency can be increased, and the number of reusable edible oils can be increased.

(Third embodiment)
Next, a third embodiment of the filter structure according to the present invention will be described with reference to FIG. In FIG. 3, (A) is a central longitudinal sectional view of the filter structure, and (B) is an exploded view thereof.

  In FIG. 3, 1 is an oil tank, and 2 is an oil discharge port provided at the center of the inner bottom thereof. These are the same as those in the above-described embodiment. A strainer 9 is attached so as to cover the oil discharge port 2 via a fixing plate spring 10 provided on the lower surface. That is, the strainer 9 faces the oil discharge port 2 and is fixed by inserting and engaging the fixing plate spring 10 into the oil discharge port 2. The strainer 9 is formed into a gentle spherical surface that is opened on the lower surface by a punching metal or a mesh net having a large number of holes, and a space 11 having a predetermined size is formed around the oil discharge port 2.

  Reference numeral 12 denotes a flat plate formed filter that covers the entire surface of the strainer 9 from above. This flat molded filter 12 is, for example, the same configuration as the molded filter 6 in the first embodiment, and is formed into a molded body having a porous structure by mixing appropriate fibers and adsorbents. In addition to removing impurities, it has various effects such as decolorization and deodorization. However, since the concave portion is not formed as in the first embodiment, it can be molded more easily.

  Reference numeral 13 denotes a press ring made of a metal rod or the like, which is placed near the periphery of the flat plate filter 12 to prevent the flat plate filter 12 from being lifted or displaced. Reference numeral 14 denotes a pressing plate made of punching metal or mesh net, which is provided so as to cover the flat plate forming filter 12 from above the pressing ring 13, and like the pressing ring 13, the lift and position of the flat plate forming filter 12 are provided. This is to prevent deviation. The presser ring 13 and the presser plate 14 may be integrally joined to each other.

  The filter structure of the third embodiment having the above-described configuration exhibits substantially the same function and effect as those of the first embodiment described above. That is, when sucked by the pump, a negative pressure is uniformly applied to the entire space portion 11, and the used cooking oil in the oil tank 1 is caused by the negative pressure to cause the pressing plate 14, the flat plate forming filter 12, and the strainer. In the order of 9, the sample is uniformly dispersed and permeated over the entire surface, and is filtered while adsorbing impurities, coloring, odor and the like. The pressing plate 14 also has a function of removing large impurities and the like.

(Fourth embodiment)
Next, a fourth embodiment of the filter structure according to the present invention will be described with reference to FIG. 4A is a central longitudinal sectional view of the filter structure, and FIG. 4B is a plan view of the presser ring.

  In FIG. 4, 1 is an oil tank, 2 is an oil discharge port provided in the center of the inner bottom. These are the same as those in the above-described embodiment. A strainer 15 is attached so as to cover the oil discharge port 2 and is constituted by, for example, a mesh net.

  A flat plate filter 16 covers the entire surface of the strainer 15 from above and is provided over the entire bottom surface of the oil tank 1. The flat plate formed filter 16 has the same structure as the formed filter 6 in the first embodiment and the flat formed filter 12 in the third embodiment, for example, and is porous by mixing appropriate fibers and adsorbents. The molded article having a structure has various effects such as decolorization and deodorization while removing impurities.

  Reference numeral 17 denotes a holding ring formed by, for example, a metal rod or the like having a spiral shape, and has a diameter commensurate with the size of the inner bottom portion of the oil tank 1. This prevents the molded filter 16 from being lifted or displaced. Reference numeral 18 denotes an arcuate rod that is installed between the side walls of the oil tank 1 so as to restrict the presser ring 17 in order to prevent the presser ring 17 from jumping up.

  In the filter structure of the fourth embodiment configured as described above, the oil is not sucked from the oil discharge port 2 by a pump, but is filtered by free fall by the weight of edible oil. That is, the used edible oil is dispersed and permeated through the entire surface of the flat plate filter 16 by its own weight, and in the process, impurities are filtered out by fibers and adsorbents, and decolored and deodorized. The filtered edible oil reaches the strainer 15 made of a mesh net, travels through a small space formed by the mesh of the strainer 15, and is discharged from the central oil discharge port 2. At this time, since the outer peripheral portion of the strainer 15 is pressed by the press ring 17 at the peripheral portion of the flat plate forming filter 16 and is in close contact with the bottom surface of the oil tank 1, edible oil is always supplied to the flat forming filter 16. The edible oil containing impurities is not discharged as it is.

(Fifth embodiment)
Next, a fifth embodiment of the filter structure according to the present invention will be described with reference to FIG. FIG. 5 is a central vertical sectional view of a relatively small filtration device that can be used at home and the like. In the figure, 21 is an oil tank for storing used edible oil, and 22 is an oil discharge port provided at the center of the inner bottom of the oil tank 21. 23 is a strainer provided so as to cover the oil discharge port 22, which is formed into a bowl shape with a mesh net or punching metal, and a space 24 having a predetermined size is formed around the oil discharge port 22. It is.

  Reference numeral 25 denotes a molded filter, which is formed of a molded body having a recess 25a formed in a bowl shape corresponding to the shape of the upper surface of the strainer 23 at least on the lower surface thereof, and is fitted and fixed so as to cover the strainer 23. . Further, the planar shape has a shape that closely fits to the inner bottom surface of the oil tank 21. As in the first embodiment, the molded filter 25 is formed into a molded body having a porous structure by mixing, for example, appropriate fibers and an adsorbent, and removes impurities and decolorizes and deodorizes. It has various effects such as. Reference numeral 26 denotes a pressing ring made of a metal rod or the like, which is placed on the periphery of the molded filter 25 to prevent its lifting.

  Reference numeral 27 denotes a flat filter, which is a thin plate formed by filling a bag with a predetermined adsorbent, and is provided so as to cover the entire upper surface of the molded filter 25. It is. The flat filter 27 uses a powder of activated clay, silicon, silica gel, magnesium oxide or the like as an adsorbent, and can mainly obtain decoloring and deodorizing effects. The flat filter 27 is freely deformed and is provided so as to fit closely along the inner surface of the oil tank 21. Reference numeral 28 denotes a holding net placed on the flat filter 27 for preventing the flat filter 27 from floating. Reference numeral 29 denotes a screen net placed on the opening of the oil tank 21, which is provided as necessary.

  This filtration device filters by the weight of edible oil. That is, when used cooking oil is introduced from the upper opening, the large net impurities are removed by the scouring net 29. Next, large impurities are also removed by the holding net 28. Thereafter, the edible oil permeates into the flat filter 27 and the molded filter 25 by its own weight, and in the process of passing, the impurities are adsorbed, and at the same time, decolorization, deodorization and the like are performed. At this time, since the flat filter 27 and the molded filter 25 are in close contact with the inner surface of the oil tank 21, edible oil containing impurities is not discharged as it is. In addition, since the space portion 24 is formed by the strainer 23, the oil penetrates evenly dispersed throughout the molded filter 25 without being concentrated on a part of the molded filter 25, and impurities can be efficiently removed.

  In addition, in each embodiment mentioned above, the planar view shape of an oil tank or various filters is not specifically limited. For example, in Patent Document 2 described above, a rectangular oil tank is provided, but the filter structure according to the present invention can also be applied to such an existing oil tank. In addition, it is preferable that each filter conforms to the bottom shape of the oil tank and is laid closely. For example, in the first embodiment, even if a circular filter is attached to the center of the rectangular oil tank, it is molded. Since the filter is in close contact with the inner bottom surface of the oil tank, the above-described effects can be sufficiently obtained.

The 1st Embodiment of the filter structure in the edible oil filtration apparatus which concerns on this invention is shown, (A) is the center longitudinal cross-sectional view of a filter structure, (B) is the exploded view. The 2nd Embodiment of the filter structure in the edible oil filtration apparatus which concerns on this invention is shown, (A) is a center longitudinal cross-sectional view of a filter structure, (B) is the exploded view. The 3rd Embodiment of the filter structure in the edible oil filtration apparatus which concerns on this invention is shown, (A) is a center longitudinal cross-sectional view of a filter structure, (B) is the exploded view. The 4th Embodiment of the filter structure in the edible oil filtration apparatus which concerns on this invention is shown, (A) is a center longitudinal cross-sectional view of a filter structure, (B) is a top view of the pressing ring. The 5th Embodiment of the filter structure in the edible oil filtration apparatus which concerns on this invention is shown, and is a center longitudinal cross-sectional view of a filter structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil tank 2 Oil discharge port 3 Strainer 4 Fixing plate spring 5 Space part 6 Molding filter 7 Flat filter 8 Filter press 9 Strainer 10 Fixing plate spring 11 Spatial part 12 Flat forming filter 13 Press ring 14 Press plate 15 Strainer 16 Flat plate Molded filter 17 Press ring 18 Bar rod 21 Oil tank 22 Oil discharge port 23 Strainer 24 Space 25 Molded filter 26 Press ring 27 Flat filter 28 Press net 29

Claims (7)

  In a filtration device comprising an oil tank having an oil discharge port on the inner bottom, a strainer that forms a space on the lower surface and is engaged with the oil discharge port via engagement means, and a porous material mixed with a fiber and an adsorbent A filter structure in an edible oil filtration device comprising a molded filter having a predetermined shape and having a concave portion corresponding to the upper surface shape of the strainer on the lower surface, the filter being configured to be fitted to the strainer.   The filter structure in an edible oil filtration device according to claim 1, further comprising a flat plate filter that covers the entire upper surface of the molded filter and that is filled with an adsorbent in a bag body, and is provided with a filter retainer on its peripheral edge. .   In a filtration apparatus comprising an oil tank having an oil outlet at the inner bottom, a strainer that forms a space on the lower surface and is engaged with the oil outlet via an engaging means, and is mixed with a fiber and an adsorbent to be porous A flat plate formed filter which is formed into a flat plate shape and which covers the entire surface of the strainer, a press ring placed near the periphery of the flat plate filter, a punching metal provided to cover the press ring, etc. The filter structure in the edible oil filtration apparatus characterized by comprising with the holding plate which consists of.   In a filtration apparatus including an oil tank having an oil discharge port on the inner bottom, a strainer provided to cover the oil discharge port, and a molded body that is formed into a porous structure by mixing fibers and an adsorbent to form a porous structure. A filter structure in an edible oil filtration apparatus comprising: a flat plate filter covering the entire surface of the strainer; and a spiral holding ring placed on the entire upper surface of the flat plate filter.   The filter structure in the edible oil filtration device according to claim 4, further comprising a rod rod to be erected in order to prevent the spiral holding ring from jumping up.   The filter structure in an edible oil filtration device according to any one of claims 1 to 3, wherein the engaging means is a leaf spring bent in a dogleg shape provided on the lower surface of the strainer.   In a filtration apparatus comprising an oil tank having an oil discharge port on the inner bottom, a strainer provided on the lower surface to cover the oil discharge port and a fiber and adsorbent are mixed to form a porous structure and the above A molded filter that is formed of a molded body having a predetermined shape with a concave portion corresponding to the upper surface shape of the strainer on the lower surface, and is closely fitted to the inner bottom surface of the oil tank and is fitted on the strainer, and is placed on the periphery of the molded filter A press ring, a flat filter that is packed with an adsorbent in the bag body, covers the molding filter and the press ring entirely, and fits closely along the inner surface of the oil tank, and is placed on the flat filter. The filter structure in the edible oil filtration apparatus characterized by comprising with a holding net.

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