JP2007209955A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter provided with a practical means for preventing firm adhesion of living things such as shells, algae, microorganisms, and bacteria contained in an object fluid to be filtered to a main body container. <P>SOLUTION: The filter comprises a cylindrical main body container 1, a cylindrical filtration element 2 installed in the main body container 1 coaxially with the main body container 1 for removing foreign matter container in a fluid, a flow-in pipe 3 attached to the main body container 1 for introducing an object fluid to be filtered, a flow-out pipe 6 attached to the main body container 1 for discharging the fluid filtered by the filtration element 2, and a container cover 4 attached to an end part in the axial direction of the main body container 1 and the main body container 1 is plated by hot dip plating with a metal containing zinc and/or aluminum as a main component. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a cylindrical main body container, a cylindrical filtration element provided coaxially with the main body container in the main body container, for removing foreign substances contained in the fluid, and attached to the main body container, and a fluid to be filtered. The present invention relates to a filter including an inflow pipe to be introduced, an outflow pipe attached to a main body container and outflowing a fluid filtered by a filter element, and a container lid attached to an axial end of the main body container.

  Cooling water at thermal power plants and nuclear power plants, water used for hydroelectric power generation, water generators, aquaculture and fishery equipment, industrial water at steelmaking, chemical and papermaking plants in industrial fields, agricultural water, When using water taken from lakes, industrial water, seawater, etc., it is necessary to remove various foreign substances from the water and seawater. A filter is used for this purpose. There are various solids that are foreign substances to be removed from the water for use, and fish, shellfish, algae and the like are also included.

  The basic structure of such a filter includes a cylindrical main body container and a filtering element (filter) provided inside the main body container. A fluid such as water or seawater is introduced into the main body container, and foreign substances contained in the fluid are filtered. Remove by element. The fluid from which the foreign matters have been removed is sent out from the outflow pipe and used for various purposes as cooling water and recirculation water. The foreign matter is discharged from the foreign matter discharge pipe (drain pipe) at an appropriate timing together with the flowed-in fluid and then disposed of. One type of filter for this purpose is a swirl vortex filter. As such a filter, what is disclosed by the following patent document 1 is known, for example.

  Patent Document 1 discloses a cylindrical main body container, a filtering element provided in the main body container, an inflow pipe for introducing liquid from a tangential direction to the main body container, and a liquid in which foreign matters are filtered by the filtering element. A filter with an outflow tube is disclosed. The fluid introduced from the inflow pipe forms a swirling flow, and separates and concentrates solids (foreign matter) by centrifugal force and discharges the solids and water together with the water. Moreover, by forming a swirl flow, it also has an effect of self-cleaning foreign matter adhering to the filter of the filter element by a peeling effect.

JP 2004230264 A JP 2004-141830 A

  As mentioned above, it is necessary to remove various solids such as wood chips, sand, etc., as well as fish, shellfish, algae, jellyfish, insects, etc. that inhabit the water taken by the filter. This prevents mechanical damage to the equipment used. In addition, micro-organisms and fungi are inhabited in the water, but they flow into the filter. For example, organisms such as mussels, bryophytes, diatoms, etc. and spoilage bacteria, sulfur-oxidizing bacteria, iron bacteria, etc., adhere to the inner wall surface or gaps of the main body of the filter in a slimy form, and can grow and proliferate in the filter. is there.

  The first problem when these organisms are propagated is that harmful microorganisms may inhabit, and particularly anaerobic bacteria release harmful toxic substances. The second problem is that due to the growth of shellfish and algae, the fluid resistance in the filter increases and the pressure loss increases, and as a result, the amount of treated water decreases and the power loss of the pump increases. Especially in swirl type filters, swirl resistance increases and water flow becomes more turbulent, the concentration effect due to centrifugal force of solid matter decreases, and the filter of the filter element clogs and pressure loss increases. . The third problem is that microorganisms and fungi adhere to and grow in gaps (such as the gap between the main body container and the container lid), and sulfides secreted by organisms destroy the metal passive film and rapidly As the corrosion progresses, the lifetime of the filter is shortened.

  In particular, since the vicinity of the container lid of the main body container is a stagnation of water and the end face of the cylindrical tube, it is likely to corrode due to the influence of stress concentration. Although the filter is regularly inspected and maintained, organisms containing these bacteria are not preferable in terms of not only environmental odor but also health and safety.

  As a countermeasure against these organisms and microorganisms, a method has been conventionally used in which a drug is injected into water to sterilize or inactivate these organisms and microorganisms. However, the use of such a drug is not preferable in terms of environmental protection, and a method that does not use the drug is required. Although there is a direction to coat the metal surface with silicon / fluorine resin as a countermeasure against the adhesion of biological filters, it is not practical to apply it to a filter in terms of insufficient durability such as wear.

  Copper / silver / molybdenum metal has antibacterial and biological repellent properties, and can prevent the adhesion of organisms and microorganisms. It is not practical to apply to the main body container in terms of cost.

  In addition, as disclosed in Patent Document 2, as a technique for preventing the fixation of organisms and microorganisms, a method of passing an electric current through water has been put into practical use in large facilities. However, if the use mode is inappropriate, there is a risk of hydrogen embrittlement of the metal, which is not preferable.

  The present invention has been made in view of the above circumstances, and its problem is practical to prevent organisms such as shellfish, algae, microorganisms, and fungi contained in the fluid to be filtered from sticking to the main body container. It is to provide a filter with means.

In order to solve the above problems, the filter according to the present invention is:
A cylindrical body container;
A cylindrical filtration element provided coaxially with the main body container in this main body container to remove foreign substances contained in the fluid,
An inflow pipe which is attached to the main body container and introduces a fluid to be filtered;
An outflow pipe attached to the main body container for flowing out the fluid filtered by the filter element;
A filter comprising a container lid attached to the axial end of the main body container,
The main body container is hot dip plated with a metal mainly composed of zinc and / or aluminum.

  The operation and effect of the filter having such a configuration will be described. A filtration element for filtering a fluid containing foreign substances is provided inside the cylindrical main body container. For example, the filtration element has a cylindrical shape, and its axis is provided so as to be coaxial with the axis of the main body container. An inflow pipe for introducing a fluid to be filtered is provided, and the fluid filtered by the filter element flows out from the outflow pipe. A container lid is attached to the axial end of the main body container. The main body container is hot dip plated with a metal mainly composed of zinc and / or aluminum. The action and effect of performing this hot dipping will be described in detail below.

  Aquatic organisms such as shellfish and algae often coexist with bacteria, and these organisms have compatibility with inorganic surfaces such as calcium carbonate and magnesium carbonate attached to metal surfaces. It will adhere to and breed. The adhesion mechanism of calcium carbonate and magnesium carbonate will be described below.

  In river water and seawater, calcium and magnesium are stably dissolved in water together with carbon dioxide as carbonates, hydrogen carbonates and hydroxides. The carbon dioxide in the water is degassed and vaporized as a gas in the water transport process after the intake or in the swirl type filter, and the pH rises and the water or seawater changes to the alkali side. By this change to the alkali side, calcium carbonate and magnesium carbonate are precipitated and crystallized on the iron surface which is the inner wall surface of the main body of the filter. Such crystallization is likely to occur on the iron surface. As a result, a calcium carbonate layer or a magnesium carbonate layer preferred by living organisms and microorganisms is formed on the metal surface, and the living organisms and microorganisms adhere and propagate. Fungi that coexist with these organisms also propagate in the same way.

  Therefore, by hot-plating the main body container with a metal mainly composed of zinc and / or aluminum, deposition of calcium carbonate and magnesium carbonate can be prevented, and underwater organisms and microorganisms adhere to the inner wall surface and propagate. Can be prevented. Incidentally, metal spraying, electroplating, electroless plating, and CVD are known as plating methods other than hot dipping, but metal spraying has insufficient adhesion to iron, and peeling occurs during use. Electroplating, electroless plating, and CVD are impractical due to the thin plating thickness and lack of durability. As described above, according to the configuration of the present invention, filtration provided with practical means for preventing organisms such as shellfish, algae, microorganisms, and fungi included in the fluid to be filtered from sticking to the main body container. Can be provided.

  In the present invention, the flange surface formed at the axial end portion of the main body container is used as a first surface for mounting the container lid, and a step portion is formed on the inner diameter side of the flange surface so as to be separated from the back surface of the container lid. Preferably, two sealing surfaces are formed, and a sealing member is disposed in a space formed between the second surface and the back surface of the container lid.

  A flange is provided at an axial end of the cylindrical main body container, and a container lid is attached to the flange surface. It is necessary to perform sealing so that fluid does not leak from a portion where the container lid and the main body container are joined. When sealing, usually, a recess (groove) is formed on the flange surface, a seal member is attached to the recess, and the seal member is compressed when attaching the container lid. If this seal portion is formed of a recess, the sealing function of the seal portion is reduced due to the problem that the anaerobic bacteria grow due to the retention of the fluid and contaminate the fluid, and the corrosion caused by the secretion material of the anaerobic bacteria. Therefore, the flange surface is a first surface for attaching the container lid, a step portion is formed on the inner diameter side of the flange surface, and a second surface separated from the back surface of the container lid is formed separately. The seal member is attached by being sandwiched between the second surface and the back surface of the container lid. By forming the stepped portion, the fluid does not stay and can communicate with the inside of the main body container to suppress the above-described problem.

  In the present invention, it is preferable that a protruding portion protruding in the direction of the second surface is formed on the back surface of the container lid, and the space is formed by the stepped portion and the protruding portion.

  According to this configuration, the sealing function can be increased by closing the space. Further, since the stepped portion is formed on the main body container side, the seal space communicates with the inside of the main body container so that the fluid does not easily stay. Thereby, the problem by the fluid staying can be solved.

  In the present invention, a gasket sandwiched between a flange surface formed at the axial end portion of the main body container and the back surface of the container lid is attached, and a seal member integrated with the gasket is disposed on the inner diameter side of the gasket. It is preferred that

  According to this configuration, the sealing function is exhibited by sandwiching the gasket between the flange surface and the back surface of the container lid. Further, a seal member is integrated and arranged on the inner diameter side of the gasket. Thereby, it can seal reliably. Moreover, there is no recessed part in a seal part, and a fluid does not stay. Therefore, it is possible to suppress the problem of deterioration of the sealing function due to corrosion.

  In the present invention, it is preferable that a metal lump having the same material as the hot dip metal or an electrochemical potential lower than that of the hot dip metal is electrically coupled to the filter element.

  When hot-plating is performed on the main body container and the filter element is made of metal, both may become different metals and form a battery in water. Since this potential is avoided by living organisms and microorganisms, it is suitable for preventing the growth of spoilage bacteria and the like, but another problem of consumption of base metals such as zinc and aluminum occurs. Therefore, by attaching the above metal lump in an electrically coupled state with the filter element for anticorrosion, the metal lump can be consumed and the consumption of the hot dipped metal can be prevented.

  A preferred embodiment of a filter according to the present invention will be described with reference to the drawings.

<First Embodiment>
<Configuration>
FIG. 1 is a diagram illustrating a configuration of a filter according to the first embodiment. FIG. 1A is a plan view (including a cross-sectional view in a direction perpendicular to the axis), (b) is a side view (including a cross-sectional view along the axial direction), and (c) is a partially enlarged view of a seal portion. It is sectional drawing. In the enlarged cross-sectional view, the main body container and the container lid are shown in a slightly separated state, and the same illustration method is adopted in other embodiments for this point.

  The main body container 1 is formed in a cylindrical shape, and is installed so that the container axis is vertical. A flange 1 a is formed at the upper end of the main body container 1, and the container lid 4 is attached by a number of bolts 8. A bottom plate 1 b is attached to the lower end portion of the main body container 1. The body container 1 is preferably made of steel such as SS400.

  A filtration element 2 is attached inside the main body container 1 coaxially with the main body container 1. The filter element 2 is made of stainless steel such as SUS304, and has an inverted conical two-layer structure. That is, the outer side of the cone is a plain woven wire mesh, and the inner side is a punching plate having an opening diameter larger than that of the wire mesh and a plate thickness larger than the mesh wire diameter, and plays a role of mechanical reinforcement of the wire mesh. A cylindrical portion 2a having no hole is welded and fixed to the upper end side of the filtration element 2, and a cylindrical portion 2b similarly having no hole is welded and fixed to the lower end side. Further, the cylindrical portion 2a on the upper end side is attached to the inner wall surface of the main body container 1 by the attaching portion 2c.

  An inflow pipe 3 is provided in the vicinity of the upper end side of the main body container 1. The inflow pipe 3 is provided in a tangential direction with respect to the circumferential wall surface of the main body container 1, and a fluid such as water to be filtered flows in. A swirling flow is formed by introducing a fluid from the tangential direction, and the effect of concentrating the foreign matter on the wall surface side of the main body container 1 by the action of centrifugal force and the action of peeling and removing the foreign matter attached to the surface of the filter element 2 are performed. . In addition, the swirling flow can suppress the growth of bacteria due to the implantation of shellfish on the main body container 1 and the filtration element 2 and the retention of water.

  An outflow pipe 6 is attached to the bottom plate 1 b of the main body container 1 downward. The lower end side cylindrical portion 2 b of the filtration element 2 is inserted into the inner diameter portion of the inlet portion of the outflow pipe 6. A drain pipe 7 is attached to the lower end side of the main body container 1 in a tangential direction with respect to the circumferential wall surface of the main body container 1. The solid high specific gravity foreign substance contained in the fluid introduced from the inflow pipe 3 settles while turning along the inner wall surface of the main body container 1 and moves to the position of the drain pipe 7 of the main body container 1. 1 is discharged outside. The fluid introduced from the inflow pipe 3 is discharged from the outflow pipe 6 in a state where foreign matters are removed by the action of the swirling flow and passing through the filtration element 2.

  Baffle plates 5 are attached to the lower part of the filter element 2 at three locations at equal intervals in the circumferential direction. Turbulent flow can be generated by the baffle plate 5, and adhesion of organisms and microorganisms at the lower part of the filter element 2 can be prevented. Further, a sacrificial zinc anode 9 (metal lump) is attached to the baffle plate 5, and it is possible to suppress depletion of zinc hot dipping of the main body container 1 described later.

  FIG. 1C shows the configuration of the seal portion. A flange 1 a is integrally formed on the upper end side of the main body container 1, and the upper surface of the flange 1 a is a first surface 1 c with which the back surface 4 a of the container lid 4 abuts. Further, a step portion is formed on the inner diameter side of the flange 1a, and a second surface 1d located at a position lower than the first surface 1c is formed. Further, a projecting portion 4b projecting downward is formed in the central portion of the container lid 4, and an O-ring 10 (corresponding to a seal member) is disposed in a closed space formed by the projecting portion 4b and the stepped portion. The protruding height of the protruding portion 4b is substantially the same as that of the second surface, and the outer diameter thereof is set to be slightly larger than the inner diameter dimension of the main body container 1.

  The O-ring 10 is a vulcanized EPDM elastomer, and the space in which the O-ring 10 is disposed is about twice the cross-sectional area of the O-ring 10. The space in which the O-ring 10 is disposed is closed, but is in communication with the inside of the main body container 1. Therefore, the structure is such that water does not easily stay in the space, and corrosion of the O-ring 10 due to bacterial growth is prevented.

<Hot plating of main body container>
In this filter, the surface of the main body container 1 is galvanized. The conditions for performing the hot dipping will be described. First, the steel surface of the main body container 1 is blasted, then degreased with sodium hydroxide and sodium orthosilicate (10% aqueous solution), and then the alkali is washed with water. After pickling with hydrochloric acid (10%, 65 ° C.) for 20 minutes and washing again with water to remove the acid, dry-type flux treatment is performed with an aqueous solution of zinc ammonium chloride (30%, 60 ° C.). Next, it was immersed in a molten zinc bath with 99% purity of 460 ° C. for 10 minutes, subjected to zinc molten plating, and then cooled. The total thickness of the plating layer and the delta layer as the alloy layer was 150 μm.

  By subjecting the main body container 1 to hot dip galvanization, deposition of calcium carbonate and magnesium carbonate can be prevented, and underwater organisms and microorganisms can be prevented from adhering to the inner wall surface and growing. Further, by disposing the sacrificial zinc anode 9, it is possible to prevent the plated zinc from being consumed.

  Actually, this filter was used in a heat pump heat exchange facility using a waste heat source for sewers, and it was possible to suppress germs and slime growth and adhesion in the filter.

Second Embodiment
<Configuration>
Next, a filter according to a second embodiment will be described with reference to FIG. Parts having the same functions as those in the first embodiment are denoted by the same reference numerals. A description will be given focusing on differences from the first embodiment. This is the same for the third and subsequent embodiments.

  An inflow pipe 3 is attached to the bottom plate 1b of the main body container 1, and fluid is introduced from the bottom. An outflow pipe 6 is attached to a substantially central portion of the main body container 1 in the height direction. The outflow pipe 6 is attached in a direction perpendicular to the outer surface of the main body container 1. The main body container 1 is made of steel such as SS400.

  The filter element 2 has a cylindrical shape, and a large number of holes are formed on the cylindrical surface. The introduced fluid introduced from the inflow pipe 3 flows from the inside of the filter element 2 to the outside, and the filtered fluid is discharged from the outflow pipe 6. Since the removed foreign matter adheres to the surface in the filtration element 2, the removal of the foreign matter can be performed by removing the filtration element 2 from the main body container 1. The filter element 2 is configured as a cylindrical body made of polypropylene. A support plate 2d is located on the bottom plate 1b of the main body container 1, and a bolt 2m disposed on the central axis is coupled to the support plate 2d. The upper end of the filter element 2 is closed by a top plate 2n. The bolts 2m are coupled through the top plate 2n. As shown in FIG. 2A, the support plate 2d has a rectangular shape in plan view, and a space for introducing a fluid from the inflow pipe 3 is secured.

  A sacrificial aluminum anode 9 is attached to the center of the protrusion 4 b of the container lid 4.

  The configuration of the seal portion is shown in FIG. 2C, but the step portion is formed as in the first embodiment, and the seal member 10 is arranged in a closed space. The seal member 10 is made of natural rubber, and is configured as a ring-shaped seal material having a convex circle on the outer side 10a and a concave circle on the inner side 10b. The space formed between the protruding portion 4b and the stepped portion is about 1.5 times as large as the radial dimension of the seal member 10.

<Hot plating of main body container>
The surface of the main body container 1 is hot dip plated with an aluminum zinc alloy by the following method. First, blasting is performed as a pretreatment for plating, followed by degreasing with sodium hydroxide and sodium orthosilicate (10% aqueous solution), then washing with alkali, and pickling with hydrochloric acid (10%, 65 ° C.) for 20 minutes. Then, after washing again with water to remove the acid, the wet process flux treatment is performed with molten salt of 50% aluminum fluoride and potassium fluoride, respectively, and then immersed in a molten alloy bath at 600 ° C. with 45% aluminum 55% zinc. And plated.

  In fact, this filter could be used in an agricultural sprinkler to prevent slime formation in the filter.

<Third Embodiment>
<Configuration>
Next, a filter according to a third embodiment will be described with reference to FIG. This filter includes an inflow pipe 3 disposed in a tangential direction of the inner wall surface of the main body container 1, an outflow pipe 6 provided on the lower end side of the main body container 1, and a drain pipe 7 disposed in the tangential direction at the bottom of the main body container 1. It has. Therefore, the fluid introduced from the inflow pipe 3 forms a swirling flow. The main body container 1 is made of steel such as SS400. A deflection plate 11 is attached to the inflow portion of the inflow pipe 3 to deflect the flow of the introduced fluid in a direction along the inner wall surface of the main body container 1. Thereby, it can be made to produce a swirl flow more easily.

  The filter element 2 has an inverted frustoconical shape, and the material is stainless steel such as SUS316, and many punching holes are formed on the surface. Similarly, a ring plate 2e of SUS316 is fixed to the upper end side of the filter element 2 by welding. The filtering element 2 is attached by sandwiching the outer peripheral edge of the ring plate 2e between the main body container 1 and the container lid 4 (see FIG. 3C). An end 6 a of the outflow pipe 6 is inserted on the lower end side of the filtration element 2.

  The structure of the seal portion is shown in FIG. 3 (c), and a step portion is formed on the flange 1 a of the main body container 1 as in the previous embodiments. A ring plate 2 e integrated with the filtration element 2 is sandwiched between the second surface 1 d and the back surface of the container lid 4. With this configuration, a closed space is formed in the stepped portion, and the seal member 10 is disposed. The seal member 10 is made of nitrile rubber (NBR), and is formed as a ring-shaped seal material having a cross-sectional shape formed in a horizontally long elliptical shape. The cross-sectional area of the seal member 10 was 2.5 times the cross-sectional area of the space in which the seal member 10 is disposed.

  Although not shown, it is preferable to install a sacrificial aluminum anode in the lower part of the filter element 2 in order to suppress consumption of the hot-plated aluminum.

<Hot plating of main body container>
The surface of the main body container 1 is galvanized by the following method. First, blasting is performed as a pretreatment for plating, followed by degreasing with sodium hydroxide and sodium orthosilicate (10% aqueous solution), then washing with alkali, and pickling with hydrochloric acid (10%, 70 ° C.) for 10 minutes. Then, after washing with water again to remove the acid, a wet process flux treatment was performed with a molten salt having a composition of 50% each of aluminum fluoride and potassium fluoride, and then immersed in a bath of molten aluminum (690 ° C.) with a purity of 99% for 10 minutes. After cooling. The plating thickness was 110 μm.

  Actually, this filter was used in a seawater treatment facility for fishery, and it was possible to suppress the growth of various bacteria and the adhesion of shellfish in the filter.

<Fourth embodiment>
<Configuration>
Next, a filter according to a fourth embodiment will be described with reference to FIG. Unlike the embodiments described so far, this embodiment is a horizontal type. That is, the main body container 1 and the filter element 2 are installed so that the axial direction thereof is horizontal. The main body container 1 is made of steel such as SS400. Both the inflow pipe 3 and the drain pipe 7 are provided tangential to the main body container 1. The inflow pipe 3 is attached above the main body container 1, and the drain pipe 7 is attached below. The inflow pipe 6 is attached to the left end portion of the main body container 1.

  The filter element 2 is integrally formed with a cylindrical main body portion 2f in which a large number of holes are formed and a frustoconical deflecting portion 2g in which no holes are formed. Accordingly, the fluid introduced from the inflow pipe 3 first collides with the deflecting portion 2g, so that a swirl flow is formed along the axial direction of the main body container 1, and the foreign matter concentrated by centrifugal force swirls while the swirl flows. 7 and is discharged from the drain pipe 7 together with the fluid. Further, the filtered fluid passes through the inside of the filter element 2 and is discharged from the outflow pipe 6. The filter element 2 is made of steel such as SS400, which is the same as the main body container 1.

  The structure of the seal portion will be described with reference to FIG. The gasket 12 is sandwiched between the flange 1 a of the main body container 1 and the back surface of the container lid 4. The gasket 12 is a ring plate made of SUS304, and the seal member 10 is integrally formed on the inner diameter side thereof. The sealing member 10 has a circular outer cross section 10c in the radial direction and a small thickness inside the radial direction, and is molded so as to sandwich (cover) the inner diameter side of the gasket 12. The seal member 10 is made of a polyol type polyurethane.

<Hot plating of main body container and filter element>
In this embodiment, both the main body container 1 and the filter element 2 are hot dip plated with an alloy of zinc and aluminum. First, as a pretreatment for plating, blasting is performed, followed by degreasing with sodium hydroxide and sodium orthosilicate (10% aqueous solution), followed by washing with alkali, and pickling with hydrochloric acid (10%, 70 ° C.) for 40 minutes. Then, after washing again with water to remove the acid, a dry flux treatment is performed with an aqueous zinc ammonium chloride solution (30%, 60 ° C.).

  Next, the main body container 1 was immersed in a molten zinc bath (zinc 90%, aluminum 10%, 500 ° C.) for 30 minutes, subjected to hot dip galvanization, and then cooled. Next, the filter element 2 was cooled after the main body container 1 was immersed in a molten zinc bath (90% zinc, 10% aluminum, 500 ° C.) for 20 minutes, subjected to hot dip galvanization. The plating thickness was 110 μm.

  Actually, this filter was used in an industrial water recirculation treatment facility for papermaking, and it was possible to suppress the growth and adhesion of germs in the filter.

<Fifth Embodiment>
<Configuration>
Next, a filter according to a fifth embodiment will be described with reference to FIG. This filter includes an inflow pipe 3 disposed in a tangential direction of the inner wall surface of the main body container 1, an outflow pipe 6 provided on the lower end side of the main body container 1, and a drain pipe 7 disposed in the tangential direction at the bottom of the main body container 1. It has. Therefore, the fluid introduced from the inflow pipe 3 forms a swirling flow. The main body container 1 is made of stainless steel such as SUS304.

  Next, the configuration of the filtration element 2 will be described. Unlike the other embodiments, the filter element 2 is configured by laminating a large number of first disks 20 and second disks 21 alternately. Details of the first disk 20 and the second disk 21 are shown in FIG. 5A. The first disk 20 and the second disk 21 are stacked in a state where a slight gap is formed, and the gap is set so that water can pass but foreign matter cannot pass. The first disc 20 includes a ring portion 20a and a coupling portion 20b, and the first rocking shaft 24 passes through the coupling portion 20b, whereby all the first discs 20 are coupled and integrated. It can swing. The second disk 21 has the same shape as the first disk 20, but is arranged with a phase shifted by 180 °. The second disk 21 is also composed of a ring portion 21a and a coupling portion 21b, and the second rocking shaft 25 passes through the coupling portion 21b. The first and second circular plates 20 and 21 are manufactured by, for example, pressing of H3130PBSP (phosphor bronze).

  A hollow shaft 22 is provided at the center of the filtration element 2 and the main body container 1, and a support plate 23 is connected to the lower end portion of the hollow shaft 22. The hollow shaft 22 and the first and second swing shafts 24 and 25 are supported by a support plate 23. The hollow shaft 22 is formed with a large number of small holes, and when cleaning water is injected from above the hollow shaft 22, the cleaning water can be ejected from the numerous small holes.

  The first and second swing shafts 24 and 25 are connected to actuators, respectively, and can drive the first and second swing shafts 24 and 25 to swing. As a result, the first and second disks 20 and 21 also swing. The lower ends of the first and second swing shafts 24 and 25 are rotatably supported by bearings provided on the support plate 23 described above. Upper end portions of the first and second swing shafts 24 and 25 are also rotatably supported by bearings provided on the container lid 4.

  FIG. 5A (a) shows a steady position, and FIGS. 5 (b) and (c) show a swinging state. In this way, by oscillating each of the disks 20 and 21, it is possible to remove the foreign matter adhering to the gap formed between the disks 20 and 21. The swing angle of each of the discs 20 and 21 can be determined as appropriate, but the range in which the overlapping state of the ring portion 20a of the first disc 20 and the ring portion 21a of the second disc 21 can be maintained (FIG. 5A ( b) As long as the gap is not generated between the ring portion 20a and the ring portion 2a as viewed in the axial direction of (c), it may be swung.

  The configuration of the seal portion will be described with reference to FIG. The gasket 12 is sandwiched between the flange 1 a of the main body container 1 and the back surface of the container lid 4. The gasket 12 is a ring plate made of SUS304, and the seal member 10 is integrally formed on the inner diameter side thereof. The seal member 10 has a circular cross section and is molded so as to sandwich (cover) the inner diameter side of the gasket 12. The seal member 10 is made of hydrogenated NBR rubber.

<Hot plating of main body container>
In the present embodiment, the main body container 1 is plated with a molten zinc copper alloy. First, blasting is performed as a pretreatment for plating, followed by degreasing with sodium hydroxide and sodium orthosilicate (10% aqueous solution), then washing with alkali, and pickling with hydrochloric acid (10%, 65 ° C.) for 20 minutes. Then, after washing again with water to remove the acid, a dry flux treatment is performed with an aqueous zinc ammonium chloride solution (30%, 60 ° C.).

  Next, the zinc ingot and brass were immersed in an alloy bath at 510 ° C. in which 95% zinc and 5% copper were dissolved in a melting bath for 10 minutes, subjected to hot dip galvanization, and then cooled. The plating thickness was 130 μm.

  Actually, this filter was used in a sewage treatment facility, and the growth and adhesion of various germs in the filter could be suppressed.

<Sixth Embodiment>
<Configuration>
Next, a filter according to a sixth embodiment will be described with reference to FIG. This filter is installed vertically, the inflow pipe 3 is provided on the lower end side of the main body container 1, and the outflow pipe 6 is provided on the upper end side. Both the inflow pipe 3 and the outflow pipe 6 are attached in the tangential direction of the main body container 1. The main body container 1 is made of steel such as SS400.

  The filter element 2 is formed in a cylindrical shape, and is manufactured by fixing a filter cloth having a length of 15 mm in which a polypropylene fiber is implanted in a polyester base fabric to the inside of a cylinder of a SUS304 stainless steel punching plate in order to ensure mechanical strength. Yes. A donut-shaped disk 2h is welded and fixed to the upper end of the filter element 2, and the disk 2h is sandwiched between the container lid 4 and the flange 1a. The lower end portion of the filter element 2 is attached by being fitted to an overhanging portion 1 e protruding from the inner wall surface of the main body container 1. Therefore, the lower side of the filter element 2 communicates directly with the inside of the main body container 1.

  A first discharge pipe 70 is provided further below the inflow pipe 3 of the main body container 1 to discharge high specific gravity foreign matter. A second discharge pipe 71 is provided at the uppermost part of the main body container 1 (in the center of the container lid 4), and foreign matter having a low specific gravity is discharged.

  According to this configuration, the fluid introduced from the inflow pipe 3 passes from the inside of the filtration element 2 to the outside, and the filtered fluid is discharged from the outflow pipe 6. The fluid introduced from the inflow pipe 3 forms a swirling flow, and the high specific gravity foreign matter contained in the fluid moves to the inner wall surface of the main body container 1 by centrifugal force and moves in the direction of the bottom plate 1b while swirling. The settled foreign matter is discharged together with the fluid from the first discharge pipe 70 provided in the vortex forward direction.

  On the other hand, the low specific gravity foreign material tends to gather on the center side of the vortex. That is, a tornado-like vortex is generated at the center of the vortex of the swirl flow, and the low specific gravity foreign matter rides on the flow of the vortex and is discharged from the second discharge pipe 71 provided at the upper part.

  The fluid from which the foreign matter has been removed passes through the filter element 2 and is discharged from the outflow pipe 6. The outflow pipe 6 is arranged in the swirl forward direction, so that the swirl flow is maintained outside the filter element 2. By this turning, the flow rate per unit area passing through each part of the filter element 2 can be equalized. Further, the swirl flow outside the filter element 2 can prevent the growth and adhesion of slime containing a large amount of germs and shellfish on the inner wall surface of the main body container 1.

  Furthermore, in the filter of the present embodiment, a small amount of air or inert gas is injected into the fluid before introducing the fluid into the filter, and light specific gravity is obtained by deaeration of odorous gas contained in the fluid and floating separation method. Foreign matter can be discharged together.

  When foreign matter is filled between the fibers of the filter element 2, the washing water may be flowed back (backwashed) from the outflow pipe 6. At this time, since the swirling direction is opposite to that in use, the cut and piled fibers are fluttered in the opposite direction to that in use, so that foreign substances clogged between the fibers are efficiently washed.

  Next, the configuration of the seal portion will be described with reference to FIG. The seal portion is the same as that of the first embodiment except that the disc 2h of the filter element 2 is sandwiched and the shape of the seal member 10. The seal member 10 is a gasket having a dumbbell cross section and is made of, for example, PVDF (polyvinylidene fluoride).

<Hot plating of main body container>
In this embodiment, the main body container 1 is hot-dip plated with an alloy of zinc and aluminum. First, blasting is performed as a pretreatment for plating, followed by degreasing with sodium hydroxide and sodium orthosilicate (10% aqueous solution), then washing with alkali, and pickling with hydrochloric acid (10%, 65 ° C.) for 20 minutes. Then, after washing again with water to remove the acid, a dry flux treatment is performed with an aqueous zinc ammonium chloride solution (30%, 60 ° C.).

  Next, it was immersed in a 480 ° C. molten zinc bath of an alloy of zinc and aluminum (Mitsui Metals Mining Products SPZ alloy) for 10 minutes, subjected to molten aluminum galvanization, and then cooled. The plating thickness was 130 μm.

  Actually, this filter was used in a waterworks treatment facility, and the growth and adhesion of various germs in the filter could be suppressed.

<Another embodiment>
Although six embodiments have been described with respect to this embodiment, various other embodiments can be employed. Moreover, it is possible to employ | adopt the structure employ | adopted in each embodiment as another arbitrary embodiment.

  Various materials other than the materials described in the present embodiment can be selected as materials for the main body container 1, the inflow pipe 3, the outflow pipe 6, the foreign matter discharge pipe 7, and the filtration element 2.

  The fluid to be filtered in the filter according to the present invention is not limited to water, and can naturally be applied to other fluids. Moreover, although this embodiment demonstrates the filter installed in all horizontal and vertical installation, as a filter of this invention, it is not limited to either.

  It is preferable to provide an air vent pipe and a valve for discharging a gas such as air staying before the operation of the filter and a gas such as air entrained by the fluid during the operation at the upper part of the main body container 1. The timing at which foreign matter is discharged from the drain pipe 7 and the discharge pipes 70 and 71 can be set as appropriate.

The figure which shows the structure of the filter concerning 1st Embodiment. The figure which shows the structure of the filter concerning 2nd Embodiment. The figure which shows the structure of the filter concerning 3rd Embodiment. The figure which shows the structure of the filter concerning 4th Embodiment. The figure which shows the structure of the filter concerning 5th Embodiment. Diagram showing details of filter element The figure which shows the structure of the filter concerning 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body container 1a Flange 1b Bottom plate 1c 1st surface 1d 2nd surface 2 Filtration element 3 Inflow pipe 4 Container lid 4a Back surface 4b Protrusion part 6 Outflow pipe 7 Drain pipe 10 Sealing member 12 Gasket 20 1st disk 21 2nd disk

Claims (5)

A cylindrical body container;
A cylindrical filtration element provided coaxially with the main body container in this main body container to remove foreign substances contained in the fluid,
An inflow pipe which is attached to the main body container and introduces a fluid to be filtered;
An outflow pipe attached to the main body container for flowing out the fluid filtered by the filter element;
A filter comprising a container lid attached to the axial end of the main body container,
A filter, wherein the main body container is hot-dip plated with a metal mainly composed of zinc and / or aluminum.   A flange surface formed at the axial end of the main body container is used as a first surface for attaching the container lid, and a step portion is formed on the inner diameter side of the flange surface to form a second surface separated from the back surface of the container lid. The filter according to claim 1, wherein a seal member is disposed in a space formed between the second surface and the back surface of the container lid.   3. The filter according to claim 2, wherein a protruding portion protruding in the direction of the second surface is formed on the back surface of the container lid, and the space is formed by the stepped portion and the protruding portion.   A gasket sandwiched between the flange surface formed at the axial end of the main body container and the back surface of the container lid is attached, and a seal member integrated with the gasket is disposed on the inner diameter side of the gasket. The filter according to claim 1, wherein   The filter according to any one of claims 1 to 4, wherein a metal block having the same material as that of the galvanized metal or a metal mass having an electrochemical potential lower than that of the galvanized metal is electrically coupled to the filter element.

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