JP2011098309A - Strainer element and filter using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strainer element and filter using the same, capable of maintaining filtering performance by scraping off impurities, preventing deposit of impurities on a difficult-to-scpare portion for prevention of propagation of algae or the like and an increase in pressure loss. <P>SOLUTION: The strainer element includes a scraping member 3 for scraping off impurities S on the primary side of a cylindrical body 2 having a filtering surface 7 for filtering impurities S contained in fluid F to be treated. The cylindrical body 2 and the scraping member 3 are provided to slide relatively to each other. The strainer element includes a coating layer 5 formed by coating the cylindrical body 2 with alloy coating 4 having characteristics of seaweedproofness, antimicrobial activity and mildewproofing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a strainer element for removing impurities contained in a processing fluid such as water used in a plant facility and a filter using the same.

  For example, in plant facilities such as water treatment plants, food plants, and pulp plants, if contaminants such as impurities enter the processing fluid, these contaminants will enter various devices and equipment, causing clogging and damage. Or may break down. In order to prevent this, normally, in this type of plant facility or facility that requires water treatment, a strainer is provided in the flow path, and the strainer element is provided in the strainer. The strainer element has a fine slot, and impurities are caught by the primary side of the slot and removed when the processing fluid passes through the slot.

  In this case, in each facility, seawater or river water may be filtered as a treatment fluid other than sewage such as sewage or industrial water. Therefore, in addition to various impurities, the processing fluid may contain algae, small organisms, fungi, and the like, and these may adhere to the slot and stay. If algae and the like adhere to the vicinity of the slot and proliferate due to this retention, the filtration area of the slot may be reduced, resulting in a pressure loss and a reduction in filtration performance. For this reason, the strainer used in this type of facility needs to prevent adhesion of impurities such as algae to the slot.

  An example of a filter that prevents algae and the like from sticking is the filter disclosed in Patent Document 1. The filter of Patent Document 1 has a filter element and a main body container for housing the filter element, and the main body container is hot-plated with a metal mainly composed of zinc and / or aluminum.

  On the other hand, the strainer of Patent Document 2 is a strainer equipped with a filter scrubber cleaning device, and has a cylindrical screen and a rotating shaft to which a brush inscribed in the screen is attached. There are springs in between. With this structure, the strainer is intended to make the brush come into contact with the screen in a pressed state with a spring, and to scrape off the filter cake adhering to the primary side of the screen with this brush.

JP 2007-209955 A Utility Model Registration No. 3073804

  However, in this type of strainer, algae, small organisms, fungi, and the like may be caught on the intersections of the slots, and the algae may adhere and become difficult to peel off. In this case, they grow and proliferate on the secondary side of the strainer, the opening area of the slot is reduced, the pressure loss is increased, and the filtration performance may be lowered. In addition, the algae that have grown and mixed with the filtered water contain harmful substances, or the algae mixed with the filtered water intrudes into equipment and devices such as plant facilities to reduce productivity. There is a possibility. In addition, the algae and the like that have proliferated promote the corrosion of the strainer, so that the strainer is likely to deteriorate and the life of the strainer may be shortened.

  The filter of Patent Document 1 tries to prevent algae and the like from adhering to the main body container by hot-plating the main body container with a metal mainly composed of zinc and / or aluminum. In the filter, there is no disclosure of the matter of subjecting the filter element to hot-dip plating, so algae or the like adheres to the filter element and grows, and as a result, the pressure loss may increase.

  On the other hand, the strainer of Patent Document 2 tries to forcibly scrape off the filter cake adhering to the screen with a brush. However, in this strainer, when fine algae entangled at the intersection of the slots cannot be scraped off with a brush, the algae grow to the secondary side of the screen and a pressure loss occurs.

  The present invention has been developed as a result of intensive studies in view of the above-described actual situation, and the object of the present invention is to remove the contaminants by scraping, and to adhere the contaminants even in a portion that is difficult to scrape. An object of the present invention is to provide a strainer element that can prevent the growth of algae and the like, prevent a loss of pressure and maintain the filtration performance, and a filter using the same.

  In order to achieve the above object, the present invention provides a scraping member for scraping contaminants on the primary side of a cylindrical body having a filtration surface for filtering contaminants contained in the processing fluid. This is a strainer element in which a member is provided so as to be relatively slidable, and this cylindrical body is coated with an alloy film having antialgal, antibacterial and antifungal properties to form a film layer.

  The present invention provides the strainer element in which the alloy film is a Ni-P alloy film.

  The present invention is a strainer element in which a filtration hole is formed in the filtration surface and the filtration hole is inclined with respect to the sliding direction of the scraping member.

  The present invention is configured to form a cylindrical body having a filtration hole by juxtaposing the rectangular wires formed in a substantially triangular cross section, the bottom surface side of the rectangular wire as the inner peripheral surface of the cylinder, and This is a strainer element in which two sides of the rectangular wire are positioned in the centrifugal direction of the cylindrical body, and the outer periphery of the cylindrical body is held by a holding member.

  In another invention, a strainer element is built in the filter body having at least a stock solution treatment channel and a filtrate channel, and the stock solution treatment channel and the filtrate channel are communicated with the strainer element. This is a filter using a strainer element in which an alloy film is applied to the inner peripheral surface of the filter main body to form a film layer.

  According to the present invention, foreign substances adhering to the filtration surface of the cylindrical body can be scraped and removed by sliding the scraping member, and have anti-algae, antibacterial and antifungal properties even in difficult to scrape portions. By the film layer formed by coating the alloy film, it is possible to prevent the algae and the like from proliferating on the whole by preventing the adhesion of impurities. Thereby, the filtration area can be secured and the filtration performance can be maintained. Moreover, the coating layer exhibits the same characteristics as when it is installed in a dark place where light does not reach even in a bright place, and the performance can be maintained for a long time in any case. In addition, since the covering layer does not adversely affect the filtration performance and the two sides of the rectangular wire provided in a substantially triangular cross section are positioned in the centrifugal direction and held by the holding member, the secondary of the filtration hole The structure has a wider opening on the side, preventing an increase in pressure loss during filtration and maintaining the filtration performance.

  When scraping dirt, the scraping member slides obliquely with respect to the filtration hole of the filtration surface, so that the dirt can be easily crushed and the scraped dirt is guided by the inclined filtration hole. And can be efficiently discharged from the filtration channel. At this time, since the scraping member slides smoothly on the bottom surface side of the rectangular wire, the contaminants are easily peeled off, and abrasion of the scraping member and peeling of the alloy film can be suppressed.

  In addition, according to another invention, it is possible to improve the filtration performance by removing impurities in the filtration fluid while preventing pressure loss, and prevent contamination such as algae in the water after filtration. Can be filtered into water. For this reason, it becomes possible to prevent the intrusion of foreign substances into various equipment and devices such as plant facilities where the filter main body is installed, and to prevent these damages and failures, thereby increasing the use value as a filter. be able to.

It is sectional drawing which shows one Embodiment of the strainer element in this invention, (a) is a longitudinal cross-sectional view of a strainer element. (B) is a cross-sectional view of a strainer element. FIG. 2 is a partially cutaway front view of the strainer element of FIG. 1. It is the expansion perspective view which showed the principal part of the strainer element. It is a partially expanded sectional view of the strainer element of FIG. It is the partially notched perspective view which showed one Embodiment of the filter in other invention. It is an expanded sectional view which shows the principal part of a strainer element. It is the principal part expanded sectional view which showed the strainer element for contrasting with the strainer element of this invention. It is the front view which showed the strainer element for contrasting with the strainer element of this invention. It is the partially expanded sectional view which showed the other example of the strainer element of this invention.

  Hereinafter, a strainer element and a filter using the same according to the present invention will be described in detail with reference to the drawings. 1 and 2 show one embodiment of the strainer element of the present invention, and FIG. 3 shows a main part of the strainer element. Moreover, in FIG. 5, one Embodiment of the filter in other invention is shown.

In FIG. 1, a strainer element main body (hereinafter referred to as an element main body) 1 has a cylindrical body 2 and a scraping member 3, and a coating layer 5 of an alloy film 4 is applied to the cylindrical body 2 by plating. .
Among these, the cylindrical body 2 is formed of, for example, a metal such as stainless steel and has a rectangular wire 6. The rectangular wire 6 is formed into a substantially triangular cross section by, for example, extrusion or pultrusion, and the cylindrical body 2 is configured by being arranged in parallel in an inclined manner. At this time, a filtration surface 7 is formed on the square wires 6 arranged side by side, and a filtration hole 8 is formed between the square wires 6 of the filtration surface 7. The rectangular wires 6 are arranged so that the bottom surface side is positioned on the inner peripheral surface 9 of the cylindrical body 2 and the two sides are positioned in the centrifugal direction of the cylindrical body 2, and the filtration holes 8 of the cylindrical body 2 are arranged on the inner peripheral surface 9. The centrifugal side is wider than the side.

  As shown in FIG. 3, the filtration surface 7 of the cylindrical body 2 is capable of filtering impurities S contained in the processing fluid F by forming the filtration holes 8. A scraping member 3 for scraping off foreign matters is provided on the primary side of the body 2. In FIG. 2, the rectangular wire 6 is disposed so as to be inclined with respect to the axis O of the cylindrical body 2, and the filtration hole 8 is inclined with respect to the sliding direction of the scraping member 3 due to this inclination.

  The outer periphery of the cylindrical body 2 is held by a holding member 11. The holding member 11 is formed, for example, in a substantially rectangular cross section and is bent in an annular shape so as to surround the cylindrical body 2. The holding member 2 is fixed to the rectangular wire 6 by appropriate fixing means such as spot welding, and holds the shape of the cylindrical body 2 by the rectangular wire 6. Further, holding rings 12 are attached to both ends of the opening of the cylindrical body 2, and the cylindrical body 2 is reinforced by the holding rings 12.

  Here, when forming the cylindrical body 2, for example, first, the holding members 11 are arranged in a plane, and the rectangular wire 6 is placed so as to be orthogonal to the holding member from above, and this rectangular wire is placed. 6 is fixed to the holding member 11 by spot welding or the like. Subsequently, this is turned over into a cylindrical shape so that the rectangular wire 6 is inclined with respect to the axis O, and the holding rings 12 and 12 are fixed to both opening end portions to form the cylindrical body 2. Next, the scraping member 3 is mounted in the cylindrical body 2 via an attachment member 15 and a rotating shaft 16 which will be described later. Accordingly, it is possible to provide the cylindrical body 2 in which the rectangular wire 6 is inclined with respect to the axis O and the filtration hole 8 is inclined with respect to the sliding direction of the scraping member 3.

  The alloy film 4 is made of an alloy having anti-algae, antibacterial, and antifungal properties. The alloy film 4 is coated on the cylindrical body 2 to a thickness of, for example, about 3 to 5 μm, so that the film layer 5 is formed. Applied. As the alloy film 4, for example, it is preferable to use a Ni—P-based alloy film, and in this case, P preferably has a content of about 1 to 10%. If the P content is less than 1%, all of the antialgae, antibacterial and antifungal properties will decrease. On the other hand, if the P content exceeds 10%, the antialgae, This is because although the fertility increases, the antibacterial property decreases. Examples of Ni-P-based alloy films that exhibit antibacterial properties include Pseudomonas aeruginosa, Salmonella, Staphylococcus aureus, MRSA, and O157: H7.

  Examples of the Ni-P alloy film containing P include Ni-P, Ni-P-B, Ni-PC, Ni-Co-P, and Zn-Ni-P. The selected alloy film 4 is coated on the cylindrical body 2. When the alloy film 4 is coated, an appropriate coating processing means such as electroplating, electroless plating, or vapor phase plating may be used.

  In particular, when a Ni-P alloy film is used as the alloy film 4, the Ni-P alloy film may contain hydrogen. In this case, the hydrogen content is preferably 0.00001 to 0.005%, for example. If the hydrogen content is less than 0.00001%, it is necessary to avoid this because there is a possibility that the algaeproofing and antifungal properties may decrease. Here, the hydrogen content refers to the hydrogen content measured when the alloy film 4 is peeled from the cylindrical body 2 and the temperature of the alloy film 4 is analyzed from room temperature to 350 ° C.

  On the other hand, the scraping member 3 is made of, for example, a polymer polymer or metal scraper, a metal or resin brush, or the like. The scraping member 3 is attached to the rotating shaft 16 via the attachment member 15. The rotation shaft 16 is disposed at the center position of the cylindrical body 2 and is provided to be rotatable with respect to the cylindrical body 2. The attachment members 15 are provided at two locations at an interval of 180 ° with respect to the axial direction of the rotating shaft 16.

  With this attachment, as shown in FIG. 4, the scraping member 3 can be rotated around the rotating shaft 16 in a state of being provided on the primary side of the flow path of the cylindrical body 2, and the cylindrical body 2 and the scraping member. 3 is relatively slidable. In this case, when the scraping member 3 is a scraper, the scraper 3 can be attached to the filtration surface 7 of the cylindrical body 2 in a line contact state, so that it can be easily attached and detached, and replacement and maintenance are also simplified.

  In the above-described embodiment, the cylindrical body 2 is the fixed side, and the scraping member 3 is rotated with respect to the cylindrical body 2 so that the cylindrical body 2 and the scraping member 3 are relatively slidable. However, although not shown, the scraping member may be a fixed side, and the cylindrical body may be slid relative to the scraping member. Moreover, in the said embodiment, although the inner peripheral side of the cylindrical body 2 is made into the primary side and the scraping member 3 is provided in this inner peripheral side, although not shown in figure, the outer peripheral side of a cylindrical body is made into the primary side, and this outer periphery side is provided. A scraping member may be provided on the side.

  Subsequently, an embodiment of a filter using the element body 1 described above will be described. In FIG. 5, one Embodiment of the filter in other invention is shown. The filter main body 20 is connected to a part of a flow path of a plant facility, for example, and has at least a stock solution processing flow path 21 and a filtrate flow path 22 so that the element main body 1 described above can be incorporated therein. In addition, a film layer 24 made of the alloy film 4 is formed in the filter body 20 by plating. The filter body 20 includes a body 25 and a cover flange 26, and a motor 27 is attached to the filter body 20.

  In the element main body 1 built in the filter main body 20, the scraping member 3 is attached to the rotary shaft 16 via the attachment member 15, and the rotary shaft 16 is connected to the motor 27. The motor 27 is provided with a switch 28, and when the switch 28 is turned on, the motor 27 rotates so that the scraping member 3 can slide relative to the cylindrical body 2.

  The body 25 in the filter main body 20 is formed in a substantially cylindrical shape, a stock solution treatment channel 21 is formed on the primary side of the body 25, a filtrate channel 22 is formed on the secondary side, and a discharge flow is formed on the bottom side. A path 29 is formed. The cover flange 26 is provided to close the opening end 25a of the body 25. The filter body 20 is configured by fixing a cover flange 26 to the body 25 with bolts and nuts 30 with a gasket (not shown) interposed in a state where the element body 1 is built in a predetermined position in the body 25.

  The stock solution processing channel 21 and the filtrate channel 22 communicate with the element main body 1. Among these, the stock solution processing channel 21 is connected to an external primary side channel (not shown), and is connected to the filter hole 8 of the element body 1. Connected to the primary side. On the other hand, the filtrate channel 22 is connected to the secondary side of the filtration hole 8 of the element body 1 and is connected to an external secondary channel (not shown). On the other hand, a discharge valve 31 is attached to the discharge passage 29, and the opening degree of the discharge passage 29 can be adjusted by operating the discharge valve 31.

  The coating layer 24 is provided on the inner peripheral surface of the filter body 20, that is, on the liquid contact portion between the body 25 and the cover flange 26. This coating layer 24 is provided in an appropriate thickness similarly to the coating layer 5 provided on the element body 1, and the type thereof is a Ni—P alloy having antialgae, antibacterial and antifungal properties. The film is coated.

Subsequently, when the processing fluid F is filtered by the filter main body 20 described above, the raw solution F ₁ of the processing fluid F is fed into the filter main body 20 from the raw liquid processing flow channel 21 via the external primary flow channel. When flowing in, the stock solution F ₁ flows into the cylindrical body 2 through the primary side opening portion of the element body 1. At this time, the stock solution F ₁ flows in the cylindrical body 2 as a swirling flow, and when passing through the filtration hole 8 of the filtration surface 7, the contaminants S easily adhere to the primary side of the filtration hole 8. Yes. The contaminant S is reliably filtered by the filtering hole 8 having a narrow gap W of about 0.15 mm, for example, and is prevented from entering the secondary side of the filtering hole 8. Subsequently, the filtrate F _2, which is the processing fluid that has passed through the filtration hole 8, flows out from the filtrate channel 22 through the external secondary channel. At this time, the filtrate F ₂ moves to the bottom surface side of the body 25, but the foreign matter S does not leak from the discharge flow path 29 to the outside by closing the discharge valve 31.

  In order to remove the foreign matter S adhering to the primary side of the element body 1, the switch 28 is turned on to rotate the motor 27, and the rotating shaft 16 is rotated so that the scraping member 3 is moved to the cylindrical body 2. It slides relatively with respect to it. By sliding the scraping member 3, the foreign matter S adhering to the primary side of the cylindrical body 2 can be scraped and fungi such as algae, small organisms, and spiders contained in the foreign matter S can be removed. Thereby, the growth of algae and the like on the primary side of the cylindrical body 2 is prevented. The foreign matter S scraped by the scraping member 3 accumulates on the bottom surface side of the body 25, but the foreign matter S can be discharged to the outside of the body by operating the discharge valve 31 to the open state. The removal of the contaminants S by the scraping member 3 can be performed during operation of a plant facility or the like to which the filter body 20 is connected.

  Since the filtration hole 8 formed in the filtration surface 7 is inclined with respect to the sliding direction of the scraping member 3, the contaminants S scraped by the scraping member 3 are moved along the inclined filtration hole 8 as shown in FIG. In this case, the gas can be efficiently discharged by being guided above or below the cylindrical body 2. Further, with this structure, the contaminant S can be easily crushed even if it is a substance that is difficult to crush, such as solid matter, fibrous or gum-like foreign matter. Further, since the scraping member 3 is always in contact with any one of the filtration surfaces 7, the sliding resistance during scraping is always substantially constant and the relative relationship between the scraping member 3 and the cylindrical body 2. Sliding is performed smoothly and wear of the scraping member 3 is reduced. Since the impurities S are removed while being guided to the filtration hole 8 as described above, they are prevented from being pushed out to the secondary side of the cylindrical body 2. Further, since the element body 1 and the tip end side of the scraping member 3 are arranged and brought into contact with each other in a straight line, the scraping member 3 can be easily attached and detached, and the scraping member 3 can be attached according to wear or wear. Can be easily replaced.

  Further, the coating layer 5 is formed by coating the cylindrical body 2 with an alloy film 4 made of a Ni-P alloy film having anti-algal, antibacterial and antifungal properties. On the surface of the alloy film 4, adsorbed water having a thickness of 10 nm to 1 μm and several tens to several hundreds of μm in a high humidity state is usually present, and Ni and P in the film are eluted in the adsorbed water. And the algae, antibacterial and antifungal properties of Ni can kill and peel off algae, fungi and moss through adsorbed water, and algae and the like on the secondary side of the element body 1 Can prevent adhesion and proliferation. At this time, the antibacterial ions are eluted in the thin water film on the surface of the alloy film 4, and the antibacterial water film covers the surface, and the bacteria are killed when the bacteria come into contact with the antibacterial water film.

  Further, when hydrogen is contained in the Ni-P-based alloy film 4, this hydrogen exerts a reducing action to activate Ni while preventing oxidation of the surface of the film layer. Can be increased. At this time, P elutes as a hydride effective for antialgae, antibacterial and antifungal properties, so that the properties of antialgae, antibacterial and antifungal properties are further improved.

As a method for increasing hydrogen in the Ni-P alloy film, for example, there are a method of exposing to a high-temperature hydrogen gas atmosphere after film formation, a method of electrochemically charging hydrogen, and the like, if an appropriate method is used. Good.
When the coating layer 5 is formed by electroplating, a cathode reaction can be caused by a hydrogen reaction, and a hydrogen content can be increased by reducing current efficiency. For this reason, as a film forming method for increasing the hydrogen content, it is preferable to form the film layer 5 by electroplating. In this case, if the hydrogen content exceeds 0.005%, the toughness of the film may be significantly reduced and cracks may occur in the film. As described above, the hydrogen content should be 0.005% or less. Is good.

  7 and 8 show a strainer element for comparison with the strainer element of the present invention, in which a coating layer is not applied to the surface of the cylindrical body 41 forming the element body 40 of FIG. It is. Since the cylindrical body 41 has a structure in which the two sides of the rectangular wire 6 are fixed to the holding member 11 in the centrifugal position, as in the case described above, the fixing portion between the rectangular wire 6 and the holding member 11 is provided. If algae, small organisms, fungi, etc. are caught on 42, the scraping member may not be able to be scraped. At this time, if the coating layer is not provided, the algae and the like in the vicinity of the fixing portion 42 cannot be killed, and the attached algae and the like grow so as to cover the filter hole 8 as shown in FIG. May adhere. As a result, as shown in FIG. 8, the deposit 43 adheres to the entire secondary side of the cylindrical body 2, leading to an increase in pressure loss.

  FIG. 9 shows another example of the strainer element of the present invention, in which a hopper 45 having a substantially U-shaped cross section is provided on the primary side in the direction in which the scraping member 3 rotates. Further, although not shown, the hopper 45 is provided with a suction pipe. The suction pipe communicates with a communication hole formed inside the rotary shaft 16, and the communication hole is connected to the outside of the filter body 20. It is provided as follows.

  In this case, since the foreign matter S scraped by the scraping member 3 is collected in the hopper 45, the foreign matter S can be sucked from the suction pipe and directly discharged to the outside through the communication hole. By combining the (and suction pipe) and the exhaust passage 29, the contaminants S can be effectively discharged from the filter body 20.

  Furthermore, in the embodiment described above, the filter main body 20 is provided as a vertical type, but a horizontal type or a Y type, a so-called Y type strainer-type filter can also be provided. In the same manner as the form, a coating layer can be formed by coating an element film or a filter body with an alloy film that exhibits anti-algal, antibacterial and antifungal properties.

  The above-described film layer applied to the strainer element or the filter is merely an example, and has a cylindrical body and a scraping member. The cylindrical body is coated with an alloy film to form a film layer. If the body is capable of exhibiting anti-algae, antibacterial and antifungal properties, the film layer may be applied by a film forming means other than plating, and the material of the cylinder or the filter body or the processing fluid It is also possible to use an alloy film other than the Ni-P-based alloy film depending on various aspects such as the type.

  Next, a flow measurement test was performed on the strainer element coated with the above-described alloy film and coated with a film layer, and the pressure was measured. In this case, the cylindrical body had an appropriate diameter of φ150 to φ184 and a length of about 387 mm. Moreover, the clearance gap W of the primary side opening site | part of the filtration hole which the square wire shown in FIG. 6 comprises was provided in 0.15 mm. The rectangular wire has an appropriate thickness according to the gap W, and the holding member also has an appropriate thickness in the same manner as the rectangular wire.

A predetermined pressure of water was passed through the strainer element from the stock solution treatment channel (primary side) of the filter body, and the pressure of the filtrate channel (secondary side) was measured. The conditions of the test, the maximum pressure: 0.304MPaG, rated ^{flow: 70L / min (4.2m 3 /} Hr) and 8.0m ³ /Hr,Vp:0.8m/s,Ve:0.123m/s The width of the filtration hole (slot width) is 0.15 mm. Under these conditions, the pressure is applied to the strainer element with the coating layer (test sample) and the solid strainer element without the coating layer (comparative product). It was measured. Table 1 shows the pressure measurement results of the test products, and Table 2 shows the pressure measurement results of the comparative products.

Table 1, comparing Table 2, even when the rated flow rate of any 4.2m ³ /Hr,8.0m ³ / Hr, under the same rated flow rate, the specimen for the secondary pressure of the comparative two The secondary pressure was almost unchanged. In addition, as in the case of the comparative product, no difference in pressure between the primary side pressure and the secondary side pressure was observed in the test sample. Further, the test sample did not increase the pressure loss on the secondary side with respect to the primary side even when time passed as in the comparative product, and was able to maintain the same pressure as the initial secondary side pressure.
From the above results, the strainer element of the present invention and the filter using the same can suppress the decrease in the secondary pressure with respect to the primary pressure in the same manner as the solid strainer element without the coating layer, Secondary pressure almost the same as a solid strainer element can be secured. For this reason, even when a film layer is applied to the strainer element, it is possible to obtain a flow rate characteristic equivalent to that of a solid strainer element. In this case, it is possible to suppress a decrease in flow rate characteristics even when time has elapsed.

DESCRIPTION OF SYMBOLS 1 Strainer element main body 2 Cylindrical body 3 Scraping member 4 Alloy film | membrane 5, 24 Film layer 6 Square wire 7 Filtration surface 8 Filtration hole 9 Inner peripheral surface 11 Holding member 20 Filter machine main body 21 Stock solution processing flow path 22 Filtrate flow path F Processing fluid S Contaminant

Claims (5)

  A scraping member is provided on the primary side of the cylindrical body having a filtration surface for filtering contaminants contained in the processing fluid, and the cylindrical body and the scraping member are relatively slidable. A strainer element characterized by being provided and coated with an alloy film having anti-algal, antibacterial and anti-fungal properties on the cylindrical body.   The strainer element according to claim 1, wherein the alloy film is a Ni-P alloy film.   The strainer element according to claim 1 or 2, wherein a filtration hole is formed in the filtration surface, and the filtration hole is inclined with respect to a sliding direction of the scraping member.   A rectangular wire having a substantially triangular cross section is arranged in parallel to form a cylindrical body having a filtration hole, and the bottom surface side of the rectangular wire is used as the inner peripheral surface of the cylindrical body. The strainer element according to any one of claims 1 to 3, wherein the two sides are positioned in the centrifugal direction of the cylindrical body, and the outer periphery of the cylindrical body is held by a holding member.   The strainer element is built in a filter body having at least a stock solution processing channel and a filtrate channel, and the strainer element is connected to the stock solution processing channel and the filtrate channel, and the filter body The filter using the strainer element according to any one of claims 1 to 4, wherein a coating layer is formed by coating the alloy coating on an inner peripheral surface.

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