JP2006305559A - Strainer apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strainer apparatus in which a microbe is not propagated, to which a barnacle, a shellfish or the like is hardly stuck and the pressure loss of which is made small. <P>SOLUTION: The strainer apparatus 10 comprises a pipe 12 in which a passage is formed linearly. An interior plate 20 consisting of a Ti plate onto the surface of which Pt-Ir is thermally sprayed is arranged on the inside surface of the pipe 12. A bar-shaped counter electrode is fit to a chink 20a of the interior plate 20. A ring-shaped counter electrode 40 and a reference electrode 48 are arranged on the upstream side of the pipe 12. A hollow conical screen 62 consisting of a plate-shaped Ti-made expanded metal onto the surface of which Pt-Ir is thermally sprayed is arranged on the downstream side of the pipe 12. A positive potential is applied to the interior plate 20 and the screen 62 with respect to the bar-shaped counter electrode 26 and the ring-shaped counter electrode 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a strainer device, and more particularly to a strainer device used to remove foreign matters such as shells, seaweeds, and seaweeds in seawater.

FIG. 10 is an illustrative view showing one example of a conventional seawater strainer as a background of the present invention. A seawater strainer 1 shown in FIG. 10 includes a filter body 2, a body 3 and a lid 4 made of a conductor. The filter body 2 is formed in a bottomed cylindrical shape with a flange 2a formed at one open end and the other end closed by a bottom plate 2b. The body 3 has openings 3a and 3b formed in the upper part and the lateral part, and flanges 3c and 3d are formed at the ends of the openings 3a and 3b. The lid 4 is formed in a cylindrical shape, and flanges 4a and 4b are formed at both ends.
In the state in which the filter body 2 is housed in the body 3, the flange 2 a has a flange 3 c formed on the top of the body 3 through the packings 5 a and 5 b, and one flange 4 a formed on the lid 4. They are clamped by bolts 6a and nuts 6b.
The inner and outer surfaces of the filter body 2, the contact surface with the sea water of the trunk 3, and the contact surface with the sea water of the lid 4 are coated with electrochemically active and stable electrocatalysts 7a, 7b and 7c. .
An electrode 8 is provided at the bottom of the body 3 so as to contact the seawater in the body 3. The electrode 8 is provided in a state of being insulated from the filter body 2 including the electric catalysts 7 a, 7 b and 7 c, the body 3 and the lid 4.
An external direct current power source 9 is connected between the filter body 2, the cylinder 3 and the lid 4 and the electrode 8, and the electric catalyst 7 a, 7 b and 7 c of the filter body 2, the cylinder 3 and the lid 4 have the potential of the electrode 8. A DC voltage is applied from the external DC power supply 9 so as to be a positive potential with respect to the potential (see, for example, Patent Document 1).

In the seawater strainer 1 shown in FIG. 10, if seawater flows in from the lid 4 side and flows out from the opening 3 b of the trunk 3 through the filter body 2, foreign matter such as shells in the seawater is captured by the filter body 2. Etc. can be removed from seawater.
Further, in the seawater strainer 1 shown in FIG. 10, the electric catalyst 7 a, 7 b, and 7 c of the filter body 2, the trunk 3, and the lid 4 are positive with respect to the electrode 8. Oxygen is generated from the surfaces of the electrocatalysts 7a, 7b and 7c of the body 2, the trunk 3 and the lid 4, and microorganisms hardly propagate on the surfaces of the electrocatalysts 7a, 7b and 7c.

Japanese Patent Laying-Open No. 2004-305821 (FIG. 5)

  However, in the seawater strainer 1 shown in FIG. 10, seawater flows into the trunk 3 from the upper opening 3a and flows out from the lateral opening 3b, so that the seawater stays in the trunk 3 and the pressure loss is large.

  Therefore, a main object of the present invention is to provide a strainer device in which microorganisms do not propagate inside and organisms such as barnacles and shellfish are less likely to adhere, and the pressure loss is small.

The strainer device according to the present invention is a strainer device including a pipe and a screen disposed in the pipe, wherein the pipe has a straight passage, and at least a majority of the inner surface of the pipe and the screen are made of an electrode material. It is formed as a working electrode, and a counter electrode and a reference electrode that becomes a reference potential are provided in the pipe. By making the working electrode potential positive with respect to the counter electrode potential, the propagation of microorganisms inside and the barnacles, shells, etc. It is a strainer device that prevents the attachment of organisms.
The strainer device according to the present invention is for, for example, filtering steam generated in a thermal power / nuclear power plant, cooling seawater for heating equipment, etc., and capturing foreign objects, thereby preventing troubles in downstream facilities. Used. Therefore, the case where seawater is filtered will be described below.
In the strainer device according to the present invention, the screen is arranged in the pipe, and the pipe is formed with a straight passage, so that the seawater hardly stays in the pipe and the pressure loss is small.
Furthermore, in the strainer device according to the present invention, since the foreign matter captured by the screen is not attached to the screen, it can be easily removed from the piping by causing the seawater flow to flow backward.
In addition, in the strainer device according to the present invention, the propagation of microorganisms is prevented not only on the upstream surface of the screen but also on the downstream surface, so that shells or the like adhere to the downstream surface of the screen and are downstream of the screen. It can be prevented from flowing out to the side.
Furthermore, in the strainer device according to the present invention, it is preferable that the screen is formed in a hollow conical shape and the apex portion thereof is arranged to face the upstream side of the pipe. In this way, foreign substances such as shells, seaweed, seaweed, etc. in the seawater captured by the screen are relatively large or heavy, from the center of the pipe with high flow velocity to the outside with low flow velocity along the screen. And collected. Therefore, even if a large amount of foreign matter within the allowable range flows, clogging by the foreign matter is suppressed near the center of the pipe where the flow is fast on the screen, and the differential pressure is kept low.
In the strainer device according to the present invention, it is desirable that the passage of the portion where the screen is arranged in the pipe is wider than the passages of the upstream side and the downstream side of the portion. If it does in this way, since the flow velocity falls in the part by which a screen is arrange | positioned, the pressure load concerning a screen can be decreased and the screen of a big filtration area can be provided. Therefore, finer foreign substances can be removed, and further the performance degradation of the strainer device can be suppressed.
In the strainer device according to the present invention, at least most of the inner surface of the pipe and the screen are formed of the electrode material as the working electrode, and the potential of the working electrode is made positive with respect to the counter electrode separately provided in the pipe. Sterilization is performed on the surface of the pole, and the growth of microorganisms can be prevented. In addition, as described above, the strainer device according to the present invention has an environment where the flow rate is lower than that of the pipes before and after the strainer device, and attached organisms such as barnacles and shellfish are likely to settle in order to increase the filtration area. In that case, the attached larvae of the attached organism have a property of favoring the place where the microorganisms propagated moderately, and the result of avoiding the settlement on the surface of the sterilized working electrode As a result, it is possible to prevent or control the adhesion of attached organisms.
In the strainer device according to the present invention, it is desirable to use a material in which the surface of Ti is covered with a coating containing Pt as the working electrode material. By using such a material for the working electrode, the working electrode of the strainer device has high corrosion resistance in seawater and electrical corrosion is prevented. That is, Ti has high corrosion resistance in seawater, but electrical corrosion may occur. By covering the surface of Ti with a coating containing Pt having excellent electrochemical reactivity, electrical corrosion in Ti can be prevented.
The strainer device according to the present invention includes an external power source for setting the potential of the reference electrode as a reference potential and the potential of the working electrode as a positive potential with respect to the potential of the counter electrode. It is desirable that the counter electrode potential be controlled to a positive potential with respect to the electrode potential. In this way, it is possible to remove minerals such as magnesium and calcium that have been deposited on the surface of the counter electrode, which is normally negative, and the microorganisms that have propagated, by periodically setting the counter electrode to a positive potential, and depositing on the counter electrode. Eliminates the need to periodically clean the scale.

According to the present invention, a strainer device can be obtained in which microorganisms do not propagate inside and organisms such as barnacles and shellfish are less likely to adhere, there is little pressure loss, and there is little performance degradation due to inflowing foreign matter.
According to the strainer device of the present invention, foreign matter captured by the screen can be easily removed from the inside of the pipe, and shellfish or the like adheres to the downstream surface of the screen and flows downstream from the screen. This can be prevented.
Furthermore, according to the strainer device according to the present invention, a strainer device having a large filtration area can be obtained, and finer inflowing foreign matter can be removed.
In addition, according to the strainer device of the present invention, it is possible to prevent performance degradation due to adhesion of marine organisms to the inner surface of the pipe and the surface of the screen, and scale deposition on the counter electrode.
Furthermore, according to the strainer device of the present invention, the inner surface of the pipe and the material of the screen are not corroded by seawater, and electrical corrosion can be prevented.
Moreover, according to the strainer apparatus concerning this invention, it becomes easy to separate and remove the foreign material in seawater according to a magnitude | size and weight.
Furthermore, according to the strainer device according to the present invention, it is possible to reduce the load caused by seawater on the screen, and to prevent deterioration of the screen.

  The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of the best mode for carrying out the invention with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a strainer device according to the present invention, FIG. 2 is a side view of the strainer device, FIG. 3 is an exploded perspective view of the strainer device, and FIG. FIG. 5 is a cross-sectional view taken along line V-V in FIG. 2, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 2, and FIG. 7 is its strainer device. It is an illustration figure which shows an example of the external power supply connected to.

  A strainer device 10 shown in FIG. 1 includes a pipe 12 in which a passage is formed in a straight line. The pipe 12 includes a cylindrical straight pipe 14 made of polyvinyl chloride and having an inner diameter of 200 mm. Flange 16 and 18 made of polyvinyl chloride are bonded to the upstream end and downstream end of straight pipe 14 with an epoxy resin adhesive, respectively. As the straight pipe 14, a 200A, PVC straight pipe having a length of 500 mm is used. As the flanges 16 and 18, PVC flanges of 200A and 10K are used, respectively.

  On the inner surface of the pipe 12, that is, the inner surface of the straight pipe 14, an interior plate 20 is provided so as to stick. For example, when filtering seawater, the interior plate 20 generates oxygen from the inner surface of the pipe 12 as a positive potential and makes it difficult for microorganisms to propagate on the inner surface. As the interior plate 20, a 0.5 mm thick Ti plate having a surface sprayed with Pt—Ir is used. The interior plate 20 is formed to have a length that is 3 cm shorter than the length of the inner periphery of the straight pipe 14. The interior plate 20 is bent so as to be entirely along the inner surface of the straight pipe 14, and the central portion is fixed to the straight pipe 14 with Ti bolts 22a, nuts 22b and washers 22c with Pt sprayed on the surface. In this case, the bolt 22 a passed through the washer 22 c passes through the interior plate 20 and the straight pipe 14, and is fastened by the nut 22 b on the outer surface of the straight pipe 14. The fixing portion of the interior plate 20 and the straight pipe 14 by the bolt 22a, etc., particularly the portion through which the bolt 22a is penetrated, is caulked with an epoxy resin by coating the epoxy resin.

  Outside the straight pipe 14, a waterproof connector 24 is provided at the tip of the bolt 22a. The connector 24 is electrically connected to the interior board 20 via a bolt 22a.

  As described above, since the interior plate 20 is formed to be 3 cm shorter than the length of the inner periphery of the straight pipe 14, a 3 cm gap 20 a is provided between the end portions of the interior plate 20 on the inner surface of the straight pipe 14. Provided. On the inner surface of the straight pipe 14, a rod-shaped counter electrode 26 is attached to the center of the gap 20a. As the rod-shaped counter electrode 26, a Ti rod having a diameter of 2 mm and a length of 510 mm that is sprayed with Pt on its surface is used. The rod-shaped counter electrode 26 is fixed to the straight pipe 14 by a Ti bolt 28a, a nut 28b, and a washer 28c with a central portion sprayed with Pt on the surface. In this case, the central portion of the rod-shaped counter electrode 26 is pressed by a washer 28c through which a bolt 28a is passed, and the bolt 28a passes through the straight pipe 14 and is stopped by a nut 28b on the outer surface of the straight pipe 14. Further, both end portions of the rod-shaped counter electrode 26 are bent toward the end surfaces of the flanges 16 and 18 so that the flanges 16 and 18 are fixed together with the electrode mounting layer 32 and the screen mounting layer 54 described later when bolted together. It has been. Further, the rod-shaped counter electrode 26 and the straight tube 14 are bonded or caulked with an epoxy resin adhesive at a fixed portion by a bolt 28 a and the both ends of the rod-shaped counter electrode 26.

  Outside the straight pipe 14, a waterproof connector 30 is provided at the tip of the bolt 28a. The connector 30 is electrically connected to the rod-shaped counter electrode 26 through a bolt 28a.

  A pole attachment layer 32 is attached to the flange 16 on the upstream side of the pipe 12. The pole attachment layer 32 is for attaching a ring-shaped counter electrode 40 and a reference electrode 48 described later. The pole attachment layer 32 is formed of polyvinyl chloride in a disc shape, and has a circular circulation hole 32a having a diameter of 134 mm at the center thereof. The pole attachment layer 32 is sandwiched between two rubber packings 34a and 34b, and is further sandwiched between the flange 16 and another flange 36, which are tightened by 12 sets of stainless steel bolts 38a, nuts 38b and washers 38c. It is done. In this case, the twelve bolts 38a are inserted into 12 sets of holes formed in the pole mounting layer 32, the packings 34a and 34b, and the flanges 16 and 36. All of the bolts 38a, nuts 38b, and washers 38c are omitted or only some of them are shown in the drawing. In addition, the other flange 36 becomes a flange of other piping, and the connection of the piping 12 and other piping becomes easy.

  A ring-shaped counter electrode 40 is attached to the pole attachment layer 32 on the inner surface that defines the flow hole 32a. As the ring-shaped counter electrode 40, a Ti-made round bar having a diameter of 2 mm formed by plating with Pt on the surface is used. In the pole attachment layer 32, pores 32b are formed so as to penetrate from the outside to the inside and communicate with the flow holes 32a. The wiring 42 is drawn into the pore 32b. One end of the wiring 42 is welded to a part of the ring-shaped counter electrode 40. Further, the portion of the ring-shaped counter electrode 40 opposite to the portion to which the wiring 42 is welded is fixed to the inner portion of the pole mounting layer 32 with Ti bolts 44a and washers 44b sprayed with Pt on the surface. In this way, the ring-shaped counter electrode 40 is attached to the electrode attachment layer 32. The pores 32b are caulked with an epoxy resin by coating the epoxy resin. Moreover, an epoxy resin is coated on the fixing portion by the bolt 44a and the washer 44b.

  On the side surface of the pole mounting layer 32, a waterproof connector 46 is provided on the other end side of the wiring 42. The connector 46 is electrically connected to the ring-shaped counter electrode 40 via the wiring 42 by being connected to the other end of the wiring 42. Thus, since the connector 46 connected to the wiring 42 is provided on the side surface of the pole mounting layer 32, a load is not applied to the connection portion between the ring-shaped counter electrode 40 and the wiring 42.

  A button-type reference electrode 48 having a diameter of 10 mm is embedded in the electrode attachment layer 32 on the surface on the pipe 12 side opposite to the wiring 42 so that one surface is exposed. As the reference electrode 48, one made of Ag / AgCl is used. The reference electrode 48 is provided with a reference potential. The pole attachment layer 32 is formed with pores 32 c so as to communicate with the reference electrode 48 from the outside. The wiring 50 is drawn into the pore 32c. One end of the wiring 50 is welded to the reference electrode 48. In this way, the reference electrode 48 is attached to the electrode attachment layer 32. Note that the pores 32c are caulked with an epoxy resin by coating the epoxy resin.

  On the side surface of the pole mounting layer 32, a waterproof connector 52 is provided on the other end side of the wiring 50. The connector 52 is electrically connected to the reference electrode 48 via the wiring 50 by being connected to the other end of the wiring 50. Since the connector 52 connected to the wiring 50 is also provided on the side surface of the pole mounting layer 32 in this way, no burden is imposed on the connection portion between the reference electrode 48 and the wiring 50.

  A screen attachment layer 54 is attached to the flange 18 on the downstream side of the pipe 12. The screen mounting layer 54 is made of polyvinyl chloride in a disc shape, has a circular circulation hole 54a with a diameter of 134 mm at the center thereof, and further has a step with a diameter of 190 mm around the circulation hole 54a on the surface on the pipe 12 side. It has a portion 54b. Similar to the pole mounting layer 32, the screen mounting layer 54 is sandwiched between two rubber packings 56a and 56b, and is further sandwiched between the flange 18 and another flange 58, which are 12 sets of stainless bolts 60a. The nut 60b and the washer 60c are tightened. The bolts 60a, nuts 60b, and washers 60c are also omitted in the drawing, or only some of them are shown in the drawing. The other flange 58 is a flange of another pipe, so that the pipe 12 can be easily connected to the other pipe.

  For example, a screen 62 for filtering seawater or the like is attached to the screen attachment layer 54. As the screen 62, a plate-shaped expanded metal made of Ti having a surface sprayed with Pt—Ir and formed into a hollow cone shape (cone shape) having a height of 300 mm and an outer diameter of a bottom portion of 190 mm is used. . In order to attach the screen 62 to the screen attachment layer 54, the ring-shaped bottom portion of the screen 62 is fitted into the stepped portion 54 b of the screen attachment layer 54. The screen attachment layer 54 is formed with pores 54c so as to penetrate from the outside to the inside and communicate with the stepped portion 54b. The wiring 64 is drawn into the pore 54c. One end of the wiring 64 is welded to a part of the bottom of the screen 62. Further, the three portions other than the portion to which the wiring 64 is welded at the bottom of the screen 62 are fixed to the inner portion of the screen mounting layer 54 by Ti bolts 66a and washers 66b, respectively, on which Pt is sprayed. . In this way, the screen 62 is attached to the screen attachment layer 54 and is arranged in the pipe 12 so that the apex portion thereof faces the upstream side of the pipe 12. The pore 54c portion is caulked with an epoxy resin by coating the epoxy resin. In addition, an epoxy resin is coated on a fixed portion of the screen 62 by the bolt 66a and the washer 66b.

  On the side surface of the screen attachment layer 54, a waterproof connector 68 is provided on the other end portion side of the wiring 64. The connector 68 is electrically connected to the screen 62 via the wiring 64 by being connected to the other end of the wiring 64. Therefore, no load is applied to the connecting portion between the screen 62 and the wiring 64.

  In this strainer device 10, the connector 24 for the interior plate 20 and the connector 46 for the ring-shaped counter electrode 40 are provided on the same side, and the connector 30 for the rod-shaped counter electrode 26 and the connector 52 for the reference electrode 48. These connectors 24 and 46 are provided on the side opposite to the connectors 24 and 46, and a connector 68 for the screen 62 is provided on the upper part.

These connectors 24, 30, 46, 52 and 68 are connected to an external power supply 100 as shown in FIG. The external power supply 100 has a control unit 102, and two output terminals 104 and 106 and one reference terminal 108 are connected to the control unit 102. The external power supply 100 is configured to be able to arbitrarily change the potentials of the output terminals 104 and 106 based on the potential of the reference terminal 108, and therefore outputs an arbitrary voltage from the output terminals 104 and 106. It is configured to be able to.
In the external power supply 100, the connector 24 for the interior plate 20 and the connector 68 for the screen 62 are connected to one output terminal 104, and the connector 30 for the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40 are connected to the other output terminal 106. The connector 46 is connected, and the connector 52 for the reference electrode 48 is connected to the reference terminal 108.

  This strainer device 10 is used, for example, to filter seawater for cooling such as heat-generating equipment in a thermal power / nuclear power plant. In this case, in the strainer device 10, seawater flows into the pipe 12 from the upstream side of the pipe 12 and flows out from the downstream side of the pipe 12, but the pipe 12 is formed in a straight line. No stagnation of seawater occurs within 12 and there is little pressure loss. Therefore, in this strainer apparatus 10, the filtration efficiency of seawater is good.

  Moreover, in this strainer apparatus 10, since foreign substances, such as a shell, seaweed, and seaweed in seawater, are captured by the screen 62 in the piping 12, foreign bodies, such as a shell, can be removed from seawater. In this case, since the screen 62 is arranged in the pipe 12 so that the apex of the screen 62 faces the upstream side of the pipe 12, a relatively large or heavy foreign matter is outside the seawater flow (the screen 62). A relatively small or light thing accumulates on the downstream side) and accumulates on the center side of the seawater flow (upstream side of the screen 62). Therefore, in this strainer device 10, even if a large amount of foreign matter within the allowable range flows, clogging by foreign matter is suppressed near the center of the pipe 12 where the flow is fast in the screen 62, and the differential pressure is kept low. In addition, foreign substances in seawater are easily separated and removed by size and weight. Moreover, in this strainer apparatus 10, since the foreign matter captured by the screen 62 is not attached to the screen 62, it can be easily removed from the pipe 12 by causing the flow of seawater to flow backward.

  Furthermore, in the strainer device 10, the potential of the interior plate 20 provided on the inner surface of the pipe 12 and the screen 62 disposed in the pipe 12 is normally set to the potential of the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40. Since the DC voltage is applied from the external power supply 100 so as to be a positive potential of, for example, +0.9 V with respect to the potential of the reference electrode 48, the surface of the interior plate 20 and the screen 62 that contact the seawater is applied. Oxygen is generated and it is difficult for microorganisms to propagate on their surfaces. In this case, since the propagation of microorganisms is prevented not only on the upstream surface of the screen 62 but also on the downstream surface, shells or the like adhere to the downstream surface of the screen 62 and flow out downstream of the screen 62. Can be prevented. In addition, in order to prevent oxygen from being generated from the surfaces of the interior plate 20 and the screen 62 that are in contact with seawater and to prevent microorganisms from propagating on these surfaces, the strainer device 10 has a potential of the interior material 20 and the screen 62. The DC voltage may be applied so that becomes a positive potential other than +0.9 V with respect to the potential of the reference electrode 48.

In the case described above, the potentials of the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40 are negative with respect to the potentials of the interior plate 20 and the screen 62, so that the surface of the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40 has minerals such as magnesium and calcium. May precipitate or microorganisms may propagate. However, in this strainer device 10, cleaning can be performed by applying a reverse voltage between the interior plate 20 and the screen 62, the rod-shaped counter electrode 26, and the ring-shaped counter electrode 40 with the external power supply 100. Has an effect. Such a cleaning operation can be performed based on the potential of the reference electrode 48, that is, the potential of the reference terminal 108 of the external power supply 100.
In order to perform such a cleaning operation intermittently, a reverse voltage is intermittently applied from the external power source 100 to the interior plate 20 and the screen 62 and the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40. You may do it.

  Furthermore, in this strainer device 10, since the interior plate 20 and the screen 62 that are in contact with seawater are made of a material obtained by spraying or plating Pt on the surface of Ti, compared to the case where Ti itself is used as a material, Durable against corrosion by seawater. For example, with Ti itself, deterioration that makes it difficult for current to flow occurs, but by spraying or plating Pt on the surface of Ti, it is possible to make current easy to flow and to prevent deterioration that makes it difficult for current to flow. Can do. In order to obtain such an effect, a material in which the surface of Ti is covered with a coating film containing Pi is preferably used as a material of a member or a portion to be prevented from such deterioration.

  Moreover, in this strainer apparatus 10, since the surface of the interior board 20 and the screen 62 etc. which contact seawater is covered with Pt, compared with the case where it does not cover with Pt, the voltage applied to the interior board 20 and the screen 62 grade | etc., In this case, the range of voltages for generating oxygen but not generating chlorine from the surfaces of the interior plate 20 and the screen 62 is widened, and it is easy to adjust the voltage applied to the interior plate 20 and the screen 62 and the like.

  Furthermore, since the strainer device 10 is provided with the reference electrode 48 and the connector 52 at the side portion, the reference electrode 48 is more easily immersed in seawater in the pipe 12 than when the reference electrode 48 and the connector 52 are provided at the upper portion. It is easier to connect the external power supply 100 to the connector 52 than in the case of being provided in the connector 52. Further, in the strainer device 10, the connector 24 for the interior plate 20, the connector 30 for the rod-shaped counter electrode 26, and the connector 46 for the ring-shaped counter electrode 40 are provided on the side, and the connector 68 for the screen 62 is provided on the top. Therefore, it is easier to connect the external power supply 100 to them than when they are provided at the lower part.

  Further, in this strainer device 10, since the pores 32b, 32c and 54c in which seawater may enter are caulked with an epoxy resin after the wirings 42, 50 and 64 are drawn in, the waterproof sealability is good.

  Further, in the strainer device 10, the flow holes 32 a formed in the pole attachment layer 32 on the upstream side of the pipe 12 and the flow holes 54 a formed in the screen attachment layer 54 on the downstream side, that is, the passages on the upstream side and downstream side of the pipe 12. Compared to the flow velocity of the seawater on the upstream side and downstream side of the pipe 12, the flow rate of the seawater in the straight tube 14 becomes slower and the screen 62 is applied to the straight pipe 14 where the screen 62 is disposed. The load caused by seawater can be reduced, the deterioration of the screen 62 can be prevented, and a screen with a larger filtration area can be provided, so that finer foreign matter can be removed and the performance of the strainer device is further reduced. Is suppressed.

  8 is a plan view showing another example of the strainer device according to the present invention, and FIG. 9 is an exploded perspective view of the strainer device shown in FIG.

The strainer device 110 shown in FIG. 8 is formed in a rod shape so that the reference electrode 48 protrudes to the downstream side of the pipe 12 compared to the strainer device 10 shown in FIG.
Further, in this strainer device 110, instead of providing the rod-shaped counter electrode 26 and the ring-shaped counter electrode 40, Pt is formed on the surface of the electrode mounting layer 32 on the surface opposite to the reference electrode 48 on the surface on the pipe 12 side. A rod-like counter electrode 41 made of a thermally sprayed Ti rod is formed so as to protrude downstream of the pipe 12 like the reference electrode 48. One end of the wiring 42 is welded to the rod-shaped counter electrode 41.
Further, in the strainer device 110, the interior plate 20 is formed to have the same length as the inner circumference of the pipe 12, that is, the inner circumference of the straight pipe 14, and is provided on the entire inner surface of the straight pipe 14. Therefore, the strainer device 110 is not provided with the gap 20a or the connector 30.

  The strainer device 110 shown in FIG. 8 has the same effects as the strainer device 10 shown in FIG. 1 and the interior plate 20 is provided on the entire inner surface of the straight pipe 14. Can be prevented from breeding.

  In each of the strainer devices 10 and 110 described above, the straight pipe 14 and the flanges 16 and 18 of the pipe 12, the pole mounting layer 32, and the screen mounting layer 54 are formed of polyvinyl chloride. It may be formed of a synthetic resin other than vinyl, or a metal surface with an insulating lining. If insulation with other parts is possible or insulation with other parts is not required, use metal. It may be formed. Note that when the pipe 12 is made of metal, the interior plate 20 is not necessary. In this case, it is preferable to form a film containing Pt on the inner surface of the pipe 12 by, for example, spraying Pt—Ir.

  Further, in each of the strainer devices 10 and 110 described above, the pipe 12, the interior plate 20, the rod-shaped counter electrode 26, the electrode mounting layer 32, the ring-shaped counter electrode 40, the rod-shaped counter electrode 41, the reference electrode 48, the screen mounting layer 54, the screen 62, and the like. Although it has a specific size and shape, they may be formed in other sizes, and the pipe 12 may be formed in other shapes as long as the passage is a straight line. May also be formed in other shapes. For example, the screen may be formed in, for example, a hollow pyramid shape, a hollow column shape, a hemispherical shape, a disc shape, or the like.

  Furthermore, in the strainer devices 10 and 110 described above, the rod-shaped counter electrode 26, the ring-shaped counter electrode 40, the rod-shaped counter electrode 41, and the like are formed of a material having Pt on the surface, but they are formed of other metal materials such as Fe, for example. May be.

Further, in the strainer devices 10 and 110 described above, instead of the rod-shaped counter electrode 26, the ring-shaped counter electrode 40, and the rod-shaped counter electrode 41, the electrode mounting layer 32 may be formed of metal, and the electrode mounting layer 32 may be used as the counter electrode.
Further, in the strainer device 10 described above, on the inner surface of the pipe 12, the rod-shaped counter electrode 26 is provided in a ring shape at the intermediate portion between the upstream side and the downstream side, and the interior plate 20 is provided in the other portion. May be.
Thus, the position and shape where the counter electrode is formed may be arbitrarily changed.

  Furthermore, the reference electrode 48 may also be formed of a metal other than Ag / AgCl, and the position where it is formed may be arbitrarily changed.

  The strainer device according to the present invention can be applied to a use for filtering cooling seawater such as a heating device in a thermal power / nuclear power plant, and can also be applied to a use for filtering fresh water in a lake or the like.

It is a perspective view which shows an example of the strainer apparatus concerning this invention. It is a side view of the strainer apparatus shown in FIG. It is a disassembled perspective view of the strainer apparatus shown in FIG. FIG. 4 is an illustrative sectional view taken along line IV-IV in FIG. 2. FIG. 5 is an illustrative sectional view taken along line VV in FIG. 2. FIG. 6 is a cross-sectional schematic view taken along line VI-VI in FIG. 2. It is an illustration figure which shows an example of the external power supply connected to the strainer apparatus shown in FIG. It is a top view which shows the other example of the strainer apparatus concerning this invention. It is a disassembled perspective view of the strainer apparatus shown in FIG. It is an illustration figure which shows an example of the conventional seawater strainer used as the background of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Strainer apparatus 12 Piping 14 Straight pipe 16, 18 Flange 20 Interior board 20a Clearance 22a, 22b, 22c Bolt, nut, washer 24 Connector 26 Rod-shaped counter electrode 28a, 28b, 28c Bolt, nut, washer 30 Connector 32 Electrode attachment layer 32a Distribution Hole 32b, 32c Hole 34a, 34b Packing 36 Flange 38a, 38b, 38c Bolt, nut, washer 40 Ring-shaped counter electrode 41 Rod-shaped counter electrode 42 Wiring 44a, 44b Bolt, washer 46 Connector 48 Reference electrode 50 Wiring 52 Connector 54 Screen mounting layer 54a Flow hole 54b Stepped portion 54c Small hole 56a, 56b Packing 58 Flange 60a, 60b, 60c Bolt, nut, washer 62 Screen 64 Wiring 66a, 66b Bolt, washer 68 Connector 100 External power supply 102 Control unit 104, 106 Output terminal 108 Reference terminal

Claims (5)

A strainer device including a pipe and a screen disposed in the pipe,
The pipe is formed with a straight passage.
At least most of the inner surface of the pipe and the screen are formed of an electrode material as a working electrode,
The pipe is provided with a counter electrode and a reference electrode that becomes a reference potential,
A strainer device configured to prevent the propagation of microorganisms and the attachment of organisms such as barnacles and shellfish by making the potential of the working electrode positive with respect to the potential of the counter electrode.   The strainer device according to claim 1, wherein the screen is formed in a hollow conical shape, and is arranged so that a vertex portion thereof faces an upstream side of the pipe.   3. The strainer device according to claim 1, wherein a passage of a portion where the screen is arranged in the piping is wider than a passage of a portion upstream and downstream of the portion.   The strainer device according to any one of claims 1 to 3, wherein a material in which a surface of Ti is covered with a film containing Pt is used as the material of the working electrode. Including an external power source for making the potential of the working electrode a positive potential with respect to the potential of the counter electrode with the reference electrode potential as a reference potential;
5. The external power source is configured so that the potential of the counter electrode can be controlled to a positive potential with respect to the potential of the working electrode with the potential of the reference electrode as a reference potential. A strainer device according to claim 1.

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