JP4903486B2 - Filter - Google Patents

Description

  The present invention relates to a filter that flows in a liquid containing a foreign substance and flows out the liquid in a state where the foreign substance is removed by a filtration element.

  Such a filter is used in various industrial fields. For example, cooling water in thermal power plants and nuclear power plants, water used for hydroelectric power generation, water and sewage water for domestic use, agricultural water, heating furnaces, rolling mills, compressors, chemical reactors in the steel, ceramics, and chemical industries It is used in cooling equipment such as distillation equipment, manufacturing equipment for producing fresh water from seawater, sprinkler watering equipment, and the like. That is, water treatment such as water, river water, lake water, seawater, etc. is required, and at the initial stage of this water treatment, it is necessary to remove foreign substances with a filter for the purpose of protecting a water treatment machine or the like. The target foreign substances include various items such as earth and sand, sludge, wood pieces, metal pieces, plastic pieces, fish, shellfish, and algae.

  The basic structure of such a filter includes a cylindrical main body container and a filtration element (filter) provided therein, and introduces a liquid to be filtered, such as water or seawater, into the main body container. Is removed by a filter element.

  The liquid from which the foreign matter has been removed is sent out from the outflow pipe and used for various purposes as described above, such as cooling water and recirculated water. The removed foreign matter is discharged from the drain pipe together with the inflowed liquid at an appropriate timing, and then disposed of. One type of filter for this purpose is a swirl vortex filter (vortex strainer). As such a filter, those disclosed in Patent Documents 1 to 4 below are known. Each of these filters has an inflow pipe, an outflow pipe, and a filter tank having a discharge pipe for discharging foreign matter, and includes a cylindrical filter element fixed in the filter tank. The liquid that flows in from the inflow pipe forms a swirling flow in the filtration tank. By generating the swirl flow, the foreign substances contained in the liquid can be separated and concentrated by centrifugal force, and can be discharged together with the liquid via the drain pipe. Moreover, it has the function of self-cleaning the foreign matter adhering to the surface of the filtration element by the peeling effect by generating the swirl flow.

JP 2003-181214 A JP 2002-263411 A JP 2000-334223 A JP 2001-347114 A

The problem in such a filter will be described. The liquid handled by the filter not only contains unnecessary foreign substances, but also naturally-occurring gases such as oxygen and carbon dioxide in the air are dissolved in the liquid. For example, about 10 liters of oxygen is dissolved in 1 m ³ of water at normal pressure. Moreover, in domestic water such as sewage and industrial sewage, toxic gases such as hydrogen sulfide that corrode metals may be dissolved.

  When such air or toxic gas is introduced into the filter, the liquid is subjected to a large shearing force because it enters a high-speed turbulent state near the inlet through which the liquid flows in through the inflow pipe. As a result, a part of the gas dissolved in the liquid becomes microbubbles released from the liquid. The microbubbles increase in diameter by colliding with each other, and float up by buoyancy while swirling with the swirling flow, and swirl in the upper region of the filter. Such air bubbles swirled in the upper part of the filter and then flowed into the filter element, and were discharged in a state where the air bubbles were mixed in the filtered liquid.

  On the other hand, in the case of domestic water, it is necessary to prevent the growth of shellfish, algae, and bacteria in the river water and seawater facilities used for health and environmental reasons. For this reason, chemical treatment is performed to oxidize organic substances including organisms and microorganisms present in water, thereby taking measures such as sterilization, decomposition, and growth suppression. Such chemical treatment is also necessary for equipment protection. In such chemical treatment, any one of ozone (oxidation potential 2.07 V), hydrogen peroxide (oxidation potential 1.77 V), hypochlorous acid (oxidation potential 1.49 V), or a combination thereof is used. There are many cases.

In the case of ozone, 2O ₃ → 3O ₂ ,
In the case of hydrogen peroxide, 2H ₂ O ₂ → 2H ₂ O + O ₂
In the case of hypochlorous acid, 2HOCL → HCL + O ₂
Oxygen gas and hydrogen sulfide are generated by the decomposition reaction shown in FIG. Moreover, in the hypochlorous acid generator by the electrolysis method of salt water, 2H ₂ O → 2H ₂ + O ₂ is caused by side reaction.
Oxygen gas and hydrogen gas are generated by the water decomposition reaction shown in FIG.

  These hydrogen sulfide, oxygen gas, and hydrogen gas, together with the air composition dissolved in the liquid, are maintained in the water in the clear flow filter, but generate a high-speed swirling flow. In the case of this filter, separation of these dissolved gases occurs to form bubbles, which are mixed as bubbles (gas) in the liquid. Such bubbles can cause various obstacles as described below.

  That is, flammable gases such as hydrogen sulfide, methane gas, and hydrogen gas are accumulated in piping of water treatment facilities and the air pool in the apparatus, which may lead to an explosion accident. In addition, if bubbles exist in the liquid, gas accumulates in cooling water pipes such as heat exchangers, chemical reaction devices, and generators, reducing thermal conductivity and causing insufficient cooling of the equipment. If air bubbles are mixed in the shaft seal water of hydro-hydraulic turbines and large-pump water-lubricated bearings, lubrication failure occurs, resulting in increased shaft wear.

  In the impeller of the pump, the rotating part of the pump or the generator is damaged due to the failure of cavitation, corrosion wear of the impeller and abnormal vibration. If the amount of gas is large, an air lock phenomenon may occur and the pump function may not be achieved. In the case of a plunger type metering pump, the valve in the pump does not operate normally. In the case of nozzle watering in steelmaking rolling, agricultural watering, etc., the amount of watering and the position of watering become inaccurate due to the presence of bubbles, and the desired performance cannot be exhibited. In the piping, a decrease in the amount of water supplied and abnormal vibration of the piping can cause noise and damage to various sensors.

  In particular, when the bubbles contain oxygen gas, there is a problem of promoting metal corrosion. For example, in the corrosion of steel and stainless steel, oxygen forms a microcell corrosion battery, and the metal wears and wears in proportion to the oxygen concentration. In addition, when a high-speed swirling flow is generated, macrocell corrosion occurs due to peeling of the metal protective passive film. Similarly, hydrogen sulfide, which is a corrosive gas, causes corrosion due to the destruction of the passive film protecting the corrosion. If bubbles are present in the liquid thus filtered, various harmful effects are caused.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a filter capable of reliably separating and discharging bubbles contained in a liquid when the liquid to be filtered is filtered. That is.

In order to solve the above problems, the filter according to the present invention is:
A cylindrical body container with a central axis installed vertically;
A cylindrical filtration element provided coaxially with the main body container in this main body container to remove foreign substances contained in the liquid,
An inflow pipe that is provided in a tangential direction with respect to the circumferential wall surface of the main body container and introduces a liquid containing a separation object;
An outflow pipe for flowing out the liquid filtered by the filter element;
A foreign matter discharge pipe provided on the bottom side of the main body container in a tangential direction with respect to the circumferential wall surface of the main body container, and for discharging the separation object together with the liquid;
A bubble discharge pipe is provided on the upper side of the main body container in a direction tangential to the circumferential wall surface of the main body container and discharges bubbles contained in the liquid together with the liquid.

  The operation and effect of the filter having such a configuration will be described. The cylindrical main body container is installed so that the central axis is vertical. Inside the main body container, a filter element for filtering a liquid containing foreign substances is provided. The filter element is formed in a cylindrical shape and is coaxial with the main body container. An inflow pipe is provided in a tangential direction with respect to the circumferential wall surface of the main body container. Since it is provided in the tangential direction, a swirling flow is generated by the momentum of the liquid flowing in from the inflow pipe. Due to the centrifugal force of the swirl, the foreign matter contained in the liquid gathers on the inner wall surface side of the main body container and is highly concentrated. On the bottom side of the main body container, a foreign matter discharge pipe is provided in a tangential direction with respect to the circumferential wall surface of the main body container. The liquid that has passed through the filter element is filtered and flows out from the outflow pipe.

  A bubble discharge pipe is provided on the upper side of the main body container in a tangential direction with respect to the circumferential wall surface of the main body container. When air or other gas contained in the liquid becomes bubbles due to the swirling flow, the specific gravity is lighter than that of the liquid, and the air rises above the main body container. A swirl flow is also generated in the upper part of the main body container, and the swirl force can discharge the bubbles together with the liquid from the bubble discharge pipe. Thereby, the filtered liquid and air bubbles can be separated. In addition, about the foreign material discharge pipe | tube and the bubble discharge pipe | tube, the structure always open | released may be sufficient and the structure open | released at an appropriate timing may be sufficient, and this invention is not limited to a specific aspect. As a result, when filtering the liquid to be filtered, it is possible to provide a filter capable of reliably separating and discharging bubbles contained in the liquid.

  In the present invention, it is preferable that a first cylindrical surface or a first tapered surface not having a filtering function is provided at a position above the filtration element and facing the bubble discharge pipe.

  By providing a surface that does not have a filtration function at a position where the bubble discharge pipes face each other, the generated bubbles can be prevented from entering the inside of the filter element, and the bubbles can be reliably discharged from the bubble discharge pipe.

  In this invention, it is preferable to arrange | position the wing | blade member which has a stirring function in the upper part side from the position where the said bubble exhaust pipe is arrange | positioned.

  Bubbles generated by the swirling flow move to the upper part of the main body container due to the difference in specific gravity with the liquid, but the swirling flow is also generated in the upper part, but the swirling speed is reduced. Therefore, by providing a wing member having a stirring function, an impact is applied to the liquid, and the generated bubbles are prevented from being redissolved in the liquid. Thereby, the discharge efficiency of bubbles can be increased.

  In this invention, it is preferable to provide the 2nd cylindrical surface or 2nd taper surface which does not have a filtration function in the position where the said inflow tube opposes.

  By providing the surface at the position where the inflow pipes face each other, it is possible to suppress the inflowing liquid from entering the filter element directly, and it is possible to generate a higher-speed swirling flow. Thereby, the effect which isolate | separates a foreign material can also be heightened.

In the present invention, a bubble entry suppression member for suppressing entry of bubbles is provided in the filtration element, and the bubble entry suppression member is disposed along the circumferential direction and extends vertically in a plate shape. A lattice is preferred.

By providing such a bubble entry suppression member , it is possible to positively generate a velocity gradient outside and inside the filter element, and to prevent bubbles generated outside the filter element from entering the filter element. .

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

<First Embodiment>
<Configuration>
The main body container 1 is formed in a cylindrical shape, and the central axis x is installed so as to be in a vertical state. The main body container 1 is preferably made of, for example, SS400 steel, and the inner wall surface is preferably rubber-lined for corrosion protection. A bottom lid 2 is coupled to the lower portion of the main body container 1 by welding or the like, and an upper lid 3 is attached to the upper portion of the main body container 1. A flange 1 a is integrally formed on the outermost surface of the uppermost portion of the main body container 1, and the upper lid 3 is detachably attached by a bolt / nut mechanism 4.

  The inflow pipe 5 is attached to the upper side (the position of about 2/3 from the bottom with respect to the full length of the main body container 1) rather than the center of the main body container 1 in the central axis x direction. The inflow pipe 5 is attached so as to be tangential to the circumferential wall surface of the main body container 1. Therefore, the liquid to be filtered introduced from the inflow pipe 5 forms a swirling flow that swirls around the central axis x. A bank 6 is provided at the boundary between the inflow pipe 5 and the main body container 1. The bank 6 suppresses the liquid flowing in from the inflow pipe 5 from moving directly toward the filtration element 7 and directs the liquid toward the inner wall surface of the main body container 1. Thereby, a stronger swirl flow can be generated.

  A cylindrical filtration element 7 is provided inside the main body container 1 and is installed so as to be coaxial with the main body container 1. The filter element 7 is manufactured by punching a large number of small holes 7a by press punching a plate. As the material, for example, SUS316 stainless steel is used. The filtration element 7 is formed in a truncated cone shape having a large diameter at the top and a small diameter at the bottom, and the end of the outflow pipe 8 is joined to the bottom of the small diameter. The outflow pipe 8 is for the filtered liquid to flow out, is attached so as to enter the inside of the main body container 1 from the bottom lid 2 side, and is sealed at the bottom of the filtration element.

  A cylindrical tube 9 (corresponding to the first cylindrical surface) is integrally joined to the upper part of the large diameter of the filter element 7 by welding or the like. Holes are not formed on the surface of the cylindrical tube 9, and therefore have no filtration function. The surface of the cylindrical tube 9 may be a tapered surface. The mounting portion 1 b protruding from the uppermost inner wall surface of the main body container 1 and the mounting portion 9 a protruding from the cylindrical surface of the cylindrical tube 9 are connected by bolts and nuts 10. Thereby, the filter element 7 is fixed to the main body container 1. Such attachment portions 1b and 9a are provided, for example, at about three locations along the circumferential direction. The mounting surfaces of these mounting portions 1b and 9a are vertical surfaces, and correspond to a wing member having a function of stirring the liquid flow as will be described later. The cylindrical tube 9 is made of, for example, SUS316 stainless steel, and the bolt / nut 10 is also made of SUS316. By removing the bolts and nuts 10, the filter element 7 can be removed for maintenance.

  Six sacrificial anodes 11 are attached to the inner wall surface of the cylindrical tube 9. As the sacrificial anode 11, for example, an aluminum alloy anode wrap manufactured by Nakabo Tech Co., Ltd. can be used, and corrosion of the filter element 7 is prevented. The number of sacrificial anodes 11 can be changed as appropriate.

  On the bottom side of the main body container 1, a foreign matter discharge pipe 12 for discharging foreign matters contained in the liquid to be filtered is provided. The foreign matter discharge pipe 12 is provided in a tangential direction with respect to the circumferential wall surface of the main body container 1 and can discharge the foreign matter together with the liquid. This tangential direction is along the direction of the swirl flow (vortex forward direction) and can be discharged smoothly using the swirl force.

  A bubble discharge pipe 13 for discharging bubbles contained in the liquid is provided on the upper side of the main body container 1. The bubble discharge pipe 13 is also provided in a tangential direction with respect to the circumferential wall surface of the main body container 1 and can discharge the bubbles together with the liquid. This tangential direction is along the forward direction of the vortex, and bubbles can be smoothly discharged using the turning force. The bubble discharge pipe 13 and the foreign substance discharge pipe 12 may be kept open at all times, but may be operated so as to be opened at an appropriate timing to discharge foreign substances and bubbles. For example, the foreign matter discharge pipe 12 can be intermittently opened to discharge foreign matters.

<Action>
Next, the filtering action of the filter according to the first embodiment will be described. A liquid containing foreign matter to be filtered is introduced from the inflow pipe 5. Since the liquid is introduced from the tangential direction, a forced vortex is generated by the momentum of the liquid and the liquid swirls. A forced vortex is a vortex in a state where the flow velocity increases toward the outer diameter side. The inner diameter of the inflow pipe 5 has a size slightly more than 1/3 of the inner diameter of the main body container 1, and a part of the inflowed liquid tends to go directly toward the filter element 7. Therefore, the bank 6 is provided as described above so that the liquid is directed toward the inner wall surface of the main body container 1 as much as possible. Thereby, a higher-speed swirl flow can be formed.

  The foreign matter having a high specific gravity is separated and concentrated on the inner wall surface side by the centrifugal force generated by the swirling flow, and the foreign matter descends along the inner wall surface of the main body container 1 while turning by gravity. And a foreign material can be discharged | emitted out of the main body container 1 with a liquid via the foreign material discharge pipe 12 provided in the bottom face part. As an effect of forming the swirl flow, in addition to concentrating the foreign matter on the inner wall surface, the effect of separating the foreign matter adhering to the surface of the filter element 2 by the swirl flow is also performed.

  On the other hand, part of the air dissolved in the introduced liquid is foamed by the high-speed swirling flow in the main body container 1 to form bubbles. The same applies to gas components other than air. Since such bubbles have a low specific gravity with respect to the liquid, they move upward and accumulate at the top of the main body container 1. At the top, although there is a turning force, the turning speed is considerably reduced. Accordingly, there is a possibility that the foamed bubbles are re-dissolved and dissolved in the liquid, and flowed out from the outflow pipe 8 as they are. In order to suppress this, the mounting portions 1b and 9a described above are arranged so that an impact can be applied to the liquid (stirring effect). This prevents bubbles from being re-dissolved and allows the bubbles to be efficiently discharged through the bubble discharge pipe 13. In the upper part of the main body container 1, although the swirl speed is weakened, the bubble discharge pipe 13 is provided in the tangential direction, so that it can be discharged by swirl flow.

  Further, among the foreign matters, the foreign matter having a specific gravity lighter than that of the liquid rises with the swirling flow, and can be discharged from the bubble discharge pipe 13 together with the bubbles.

  When the filter according to the present embodiment was used for removing foreign substances in seawater used in a heat exchanger for cooling a distillation tower for petroleum refining, it was possible to contribute to stable and safe operation of the heat exchanger. . In addition, the bubble discharge pipe 13 and the foreign substance discharge pipe 12 are connected to a three-way valve, and one of the bubble discharge pipe 13 and the foreign substance discharge pipe 12 is alternately operated.

Second Embodiment
Next, the filter which concerns on 2nd Embodiment is demonstrated. Parts having the same functions as those in the first embodiment are denoted by the same reference numerals. A description will be given centering on differences from the first embodiment. This also applies to the third and subsequent embodiments.

  As in the first embodiment, the main body container 1 is installed so that the central axis x is in the vertical direction, and is preferably made of stainless steel of SUS304. The filter element 7 is preferably made of SUS304 stainless steel as a raw material. The plate is produced by punching a large number of small holes 7a by press punching, and the inside is opened from the small holes 7a. A double structure with a small plain weave wire mesh. The filtration element 7 is formed in a cylindrical shape from the upper part to the lower part, and has substantially the same axial length as the main body container 1. A ring-shaped flange plate 7 b is welded to the upper portion of the filter element 7. The filtering element 7 is fixed to the main body container 1 by sandwiching the edge portion of the flange plate 7 b between the flange 1 a of the main body container 1 and the upper lid 3. The wing members 20 are arranged at equal intervals along the circumferential direction on the outer side of the filter element 7 at the uppermost part of the filter element 7 and below the flange plate 7b. The wing members 20 are attached to a total of six locations, but the number can be changed as appropriate. The function of the wing member 20 is to provide a liquid stirring function similar to that of the attachment portions 1b and 9a described in the first embodiment.

  The upper lid 3 is formed with a convex portion 3a protruding upward in a spherical shape, and an exhaust port 3b is provided at the center thereof. This exhaust port 3b is provided to discharge the air filled in the filter to the outside before starting the filtration operation. During the filtration operation, this exhaust port 3b is in a closed state. deep.

  The inflow pipe 5 is provided at a substantially middle height position of the main body container 1. The outflow pipe 8 penetrates into the inside of the filtration element from the bottom plate 2 as in the first embodiment, and the inflow port is located at the lower quarter height of the filtration element.

  When the filter according to the present embodiment was used in the water for washing and washing nozzles used in the pickling process in the steel mill rolled steel plate plating process, it was possible to discharge the bubbles continuously from the bubble discharge pipe 13 and to stabilize Cleaning was possible. Further, the filtered water inlet valve is periodically closed, and backwash water for cleaning the filter element 7 by pumping clean water from the filtered water outlet side is supplied from both the foreign matter discharge pipe 12 and the bubble discharge pipe 13. The filter element 7 was discharged and washed.

<Third Embodiment>
Next, the filter which concerns on 3rd Embodiment is demonstrated. In this embodiment, the central portion of the upper lid 3 has a shape protruding into the main body container 1, and a tapered surface 3 c is formed on the upper side of the main body container 1. This taper surface 3c is just at the position facing the bubble discharge pipe 13. The tapered surface 3c forms a truncated cone shape having a larger diameter as it goes upward. Since no small hole is formed in the tapered surface 3c, it does not have a filtering function. When bubbles are generated by the swirling flow, the bubbles rise by the swirling flow. However, by providing the tapered surface 3c, it is possible to prevent the bubbles from entering the filter element 7.

  A fitting portion 3d is integrally formed at the lowermost portion of the tapered surface 3c, and the upper end portion of the filter element 7 is fitted. The lower end portion of the filter element 7 is fitted into a flange 8 a formed at the end portion of the outflow pipe 8. Thereby, the filtration element 7 is fixed in the main body container 1. The main body container 1 and the filter element 7 can be made of SUS316 stainless steel, and the filter element 7 can punch a large number of small holes 7a by pressing. The filter element 7 is formed in a cylindrical shape.

  A sacrificial anode 11 is fixed to the fitting portion 3 d of the upper lid 3 and fulfills the anticorrosion function of the main body container 1 and the filtration element 7. As the sacrificial anode 11, for example, a zinc alloy anode CPZ manufactured by Nippon Shokuhin Kogyo Co., Ltd. can be used. The sacrificial anode 11 is disposed inside the filtration element 7 and in the vicinity of the upper end.

  This filter was used to remove foreign matter from the vertical large pump shaft seal water with cooling seawater taken in from a thermal power plant. Bubbles were continuously discharged from the bubble discharge pipe 13, and minute bubbles were observed in the discharged seawater, which contributed to stable operation of the pump.

<Fourth embodiment>
Next, the filter which concerns on 4th Embodiment is demonstrated. The bottom lid 2 of the main body container 1 has a convex portion protruding in a spherical shape at the bottom. The main body container 1 is made of SS400 stainless steel, and an unsaturated polyester glass fiber reinforced resin is lined on the inner wall surface to prevent corrosion. The filter element 7 is SUS304 stainless steel. A flange plate 7b is attached to the uppermost portion of the filtration element 7 by welding, and the filtration element 7 is fixed to the main body container 1 by sandwiching the flange plate 7b between the flange 1a of the main body container 1 and the upper lid 3. Is done.

  Inside the filtration element 7, vertical grids 14 (corresponding to bubble entry suppression members) are arranged at equal intervals along the circumferential direction. The vertical lattice 14 extends in a plate-like shape in the vertical direction, and has a length substantially the same as the vertical length of the filter element 7. About the number of arrangement | positioning of the vertical grid | lattice 14, it can change suitably. A high-speed swirling flow is generated outside the filter element 7, but momentum is consumed by collision with the filter element 7 as the liquid passes through the filter element 7 from the outside to the inside. However, the swirl flow (velocity is weakened) in the same direction as the outside is still maintained inside the filter element 7. Therefore, by disposing the vertical lattice 14 in the filter element 7, it is possible to suppress the swirl flow in the filter element 7 and to prevent bubbles from entering the filter element 7 due to the effect of the swirl speed gradient. This effect could be achieved even if the vertical lattice 14 had a circular cross section.

  This filter was used using sewage as a filter for removing solid foreign matters in a sewage treatment facility. The bubble discharge pipe 13 and the foreign substance discharge pipe 12 were connected to a three-way valve, and one of foreign substance discharge and bubble discharge was alternately performed. As a result, we were able to contribute to safe operation and stable operation of sewage treatment.

<Fifth Embodiment>
Next, the filter which concerns on 5th Embodiment is demonstrated. The main body container 1, the bottom lid 2 and the top lid 3 are made of SS400 steel, and SUS316 steel is bonded to the inner surface side to prevent corrosion. The filter element 7 is made of SUS316 stainless steel. The filter element 7 is formed in an inverted truncated cone shape as a whole, and has a larger diameter toward the top. A flange plate 7b is coupled to the upper end of the filter element 7 as in the fourth embodiment.

  The 1st taper surface 7c is formed in the upper part of the filtration element 7, This has the same function as the taper surface 3c in 3rd Embodiment. A second taper surface 7 d is formed at the center of the filtration element 7 in the height direction, and is formed at a position just opposite to the inflow pipe 5. Similar to the first taper surface 7c, the second taper surface 7d has no small holes and does not have a filtering function. Therefore, the liquid that has flowed in from the inflow pipe 5 can be prevented from directly entering the filter element 7, and a high-speed swirling flow can be formed.

  Although the 1st taper surface 7c and the 2nd taper surface 7d can be made into the same taper angle as the part in which the mesh | network of the filter element 7 is formed, you may make a different angle. The first tapered surface 7c and the second tapered surface 7d may be formed in a cylindrical surface.

  In the present embodiment, a cleaning mechanism for preventing clogging of the filter element 7 is provided. A rotating shaft 15 is installed along the central axis of the main body container 1, and a large number of nozzles 16 are attached to the rotating shaft 15 in the radial direction. A plurality of nozzles 16 are provided in the vertical direction, and high-pressure water can be sprayed from the tip portion toward the filtration element 7. As the nozzle, for example, a minimax manufactured by Spraying System can be used.

  An electric motor 17 is installed on the upper portion of the rotating shaft 15 (upper portion of the upper lid 3), and the rotating shaft 15 can be rotated. The rotating shaft 15 is formed in a hollow shape, and the cleaning liquid is supplied from a supply pipe 18 provided on the lower side of the rotating shaft 15. Accordingly, the entire area on the inner surface side of the filter element 7 can be cleaned by supplying the cleaning liquid while rotating the rotary shaft 15. An outflow auxiliary pipe 8b is provided in the center of the bottom lid 2 in the vertical direction, and the outflow pipe 8 is connected to the outflow auxiliary pipe 8b.

  This filter was used as a seawater supply filter for a reverse osmosis seawater desalination apparatus at a power plant. Bubbles were continuously discharged from the bubble discharge pipe 13. The filtration element 7 was washed by using industrial water as a washing liquid and washing the inside of the filtration element 7 with a water pressure of 1.2 MPa. In this way, the frequency of cleaning by opening the inside of the filter could be reduced.

<Another embodiment>
Although five embodiments related to the present invention have been described, 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 5, the outflow pipe 8, the foreign matter discharge pipe 12, the bubble discharge pipe 13, and the filtration element 7.

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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body container 1a Flange 1b Attachment part 2 Bottom cover 3 Top cover 3c Tapered surface 5 Inflow pipe 6 Deck 7 Filter element 7a Small hole 7b Flange plate 7c 1st taper surface 7d 2nd taper surface 8 Outflow pipe 9 Cylindrical tube 9a Attachment part 11 Sacrificial anode 12 Foreign matter discharge tube 13 Bubble discharge tube

Claims (5)

A cylindrical body container with a central axis installed vertically;
A cylindrical filtration element provided coaxially with the main body container in this main body container to remove foreign substances contained in the liquid,
An inflow pipe that is provided in a tangential direction with respect to the circumferential wall surface of the main body container and introduces a liquid containing a separation object;
An outflow pipe for flowing out the liquid filtered by the filter element;
A foreign matter discharge pipe provided on the bottom side of the main body container in a tangential direction with respect to the circumferential wall surface of the main body container, and for discharging the separation object together with the liquid;
A filter comprising a bubble discharge pipe provided on a top side of the main body container in a tangential direction with respect to a circumferential wall surface of the main body container and discharging bubbles contained in the liquid together with the liquid. 2. The filter according to claim 1, wherein a first cylindrical surface or a first tapered surface that does not have a filtration function is provided at a position above the filtration element and facing the bubble discharge pipe. The filter according to claim 1 or 2, wherein a wing member having a stirring function is disposed on an upper side of a position where the bubble discharge pipe is disposed. The filter according to any one of claims 1 to 3, wherein a second cylindrical surface or a second tapered surface not having a filtering function is provided at a position where the inflow pipes face each other. A bubble entry suppression member for suppressing entry of bubbles is provided in the filtration element, and the bubble entry suppression member is a vertical lattice that is arranged along the circumferential direction and extends in a plate-like vertical direction. The filter according to any one of claims 1 to 4.

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