JP2019098272A - strainer - Google Patents

Abstract

To provide a strainer which automatically crushes a foreign matter such as a twig, which is mixed with sludge and is flown in, and discharges the same to an exterior, prevents that sludge scraped by a scraping component or the like remains in an interior, thereby decreasing filtration capacity of a filter element, and does not damage important equipment provided on a secondary side.SOLUTION: A strainer 11 having, on a cylindrical strainer body 12, a cylindrical filter element 14 in which treated water is flown from an inflow port 13 and which filters said water, a filter chamber 15 which filters from this filter element 14 to an outer peripheral side, and an outlet port 16 which flows out filtrate water from the filter chamber 15. In this strainer, a crusher 19, which crushes a foreign matter such as a twig, is provided at a bottom of the filter element 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a strainer for filtering water to be treated containing various foreign substances (hereinafter referred to as sludge) and the like to remove the sludge, and more specifically, foreign substances such as twigs flowing into the sludge and flowing in The strainer is provided with a crusher at the bottom to crush the

  Many industrial facilities use river water as industrial water, but even in hydroelectric power stations, water cooling is generally used to cool the bearings of hydraulic generator and hydraulic oil / lubricating oil equipment, so rivers and outdoor water The water taken from the reservoir is used as cooling water. Although this cooling water requires clean water, the water taken from a river or outdoor water storage tank contains sludge such as dust or fallen leaves, and this sludge is to be prevented from entering the cooling system. There is a strainer in the middle of the cooling water system.

  The strainer is provided with a filter element in the strainer main body through which the water to be treated flows, and this filter element is configured to allow passage of water and capture sludge in the water to be treated, and the filter element downstream of the strainer Water supplied by filtration to remove sludge.

  As a result, the captured sludge adheres to the filtration element in the strainer main body, and if it is left as it is, the pressure loss becomes large and the required flow rate can not be obtained. In order to prevent such a situation, it is necessary to remove the sludge adhering to the filtration element to restore the filtration capacity of the filtration element.

  For this reason, a strainer is proposed which automatically removes the sludge adhering to the filtration element during operation of the strainer to recover the filtration capacity of the filtration element. For example, Patent Document 1 discloses the inner peripheral side of the filtration element Alternatively, a drive blade is disposed on the outer peripheral side, and the filter element is backwashed with filtered water in the filtration tank by the driving force when the drive blade is rotationally driven in the circumferential direction of the filter element. A strainer has been proposed to remove the deposited sludge.

  In Patent Document 2, a scraping body having a scraping member attached to the tip end inside the filtration element is rotatably provided, and a slight clearance is set between the inner circumferential surface of the filtration element and the scraping member. A strainer has been proposed which generates a water flow near the inner circumferential surface of the filter element by rotating the scraping body, and removes sludge attached to the filter element by the water flow.

  Further, in Patent Document 3, a backwash pipe rotatably driven by a rotating shaft is provided inside the filter element, and sludge left on the filter element and sediment on the bottom of the strainer by opening the backwash pipe to atmospheric pressure. Strainers have been proposed to remove such sludge.

  Further, in Patent Document 4, a brush is provided which contacts along substantially the entire length in the axial direction of the filtration element along the inner and outer peripheral surfaces of the filtration element, and the filtration element is interlocked with the central rotation axis Strainers have been proposed that are configured to rotate and remove sludge attached to the filtration element.

JP 2003-181214 Japanese Patent Application Laid-Open No. 8-80405 JP 7-136421 A Unexamined-Japanese-Patent No. 1-94908

  The strainer of Patent Documents 1 to 4 can automatically remove the sludge attached to the filtration element and discharge the removed sludge to the outside of the strainer to restore the filtration capacity of the filtration element.

  However, water taken from a river or outdoor water storage tank (hereinafter referred to as treated water) contains foreign matter of twigs and bark (hereinafter referred to as twigs etc.) other than sludge, and strainer It may flow into the inside and sink into the bottom of the strainer at the bottom of the filter element.

  In particular, when a relatively long twig or the like sinks into the bottom of the strainer main body, it may not be discharged from the sludge discharge port provided at the bottom of the strainer main body and may remain in the bottom. With regard to foreign substances such as twigs, the strainer which automatically removes and discharges the sludge adhering to the filtration element proposed in the above-mentioned document can not cope with it.

  If twigs or the like sink and remain in the bottom of the strainer body, the sludge scraped off by the scraping member etc. gets entrapped in the twigs etc. and accumulates on the bottom of the strainer body, which makes it difficult to discharge the sludge. Sludge separated from the entangled state may again adhere to the filtration element and prematurely reduce the filtration capacity of the filtration element.

  Therefore, the sludge attached to the filter element can be removed and discharged automatically, and while the strainer is originally maintenance free and usable, the use of the strainer is stopped at any time and the filter element is outside the strainer body. It is necessary to perform a troublesome cleaning operation to remove sludge, twigs and the like which are taken out and sink to the bottom of the strainer body.

  Also, if a twig or the like sunk in the bottom of the strainer body flows out of the strainer body for any reason as it is, there is a risk of damaging important equipment provided on the secondary side of the strainer.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to automatically crush foreign matter such as twigs flowing into the sludge and discharge it to the outside. To provide a strainer that prevents sludge that has been scraped off by a scraping member or the like from staying inside to reduce the filtration capacity of the filter element, and that the important equipment provided on the secondary side is not damaged. It is in.

  In order to achieve the above object, the invention according to claim 1 is a cylindrical strainer main body, and a cylindrical filter element through which water to be treated flows in from the inflow port for filtration, and filtration from the filter element to the outer peripheral side The strainer has a filtration chamber and an outlet for discharging filtered water from the filtration chamber, and the strainer is characterized by including a crusher for crushing foreign matter such as a twig at the bottom of the filtration element.

  In the invention according to claim 2, the crusher is rotatably provided at the opening portion formed at the bottom of the filter element via a pivot shaft pivotally mounted for the strainer main body, and the crusher is a strainer main body The strainer is a strainer that faces the discharge chamber provided at the lower part of the strainer and is in communication with the discharge port provided at the lower part of the strainer main body.

  According to a third aspect of the present invention, the crusher includes an upper crusher blade that rotates through a pivot shaft, a lower crusher blade that is spaced apart from the upper crusher blade by a predetermined distance, and a space, and a space It is a strainer provided with a partition fixed in the radial direction centering on the pivot shaft and a connecting rod in which both ends are connected to the partitions.

  The invention according to claim 4 is a strainer in which the upper crushing blade is a rotary blade and the lower crushing blade is a disk crushing blade having a large number of insertion holes.

  In the invention according to claim 5, the upper crushing blade and the lower crushing blade are strainers in which arbitrary crushing blades are exchangeably provided corresponding to the crushing of foreign matter such as a twig.

  According to the invention of claim 1, since the bottom of the filter element is provided with a crusher for crushing foreign matter such as twigs, it is possible to discharge foreign matter such as twigs mixed in with the sludge from the discharge port. Can be crushed and discharged from the discharge port to the outside of the strainer body.

  In addition, since foreign matter such as twigs do not remain in the discharge chamber, the sludge scraped off by the scraping member or the like does not accumulate in the discharge chamber, so the sludge accumulated in the discharge chamber adheres again to the filtration element No reduction in the filtration capacity of the

  Therefore, the use of the strainer is stopped at any time, the filtration element is taken out of the strainer, and the troublesome cleaning work of removing the sludge, twigs and the like accumulated in the discharge chamber of the strainer becomes unnecessary.

  According to the invention as set forth in claim 2, since the crusher is rotatably provided at the opening formed at the bottom of the filter element via the pivot shaft pivotally mounted for the strainer main body, a dedicated drive mechanism The crusher can be driven via a pivot shaft pivotally mounted for the strainer main body to crush foreign matter such as twigs without providing the.

  In addition, since the crusher is provided facing the discharge chamber and the discharge chamber is in communication with the discharge port, the foreign matter such as a twig or the like crushed by the crusher is not immediately left in the discharge chamber, immediately through the discharge port. Can be discharged to the outside of the strainer body.

  According to the invention as set forth in claim 3, the crusher has an upper crusher blade which is pivoted through a pivot shaft, and a lower crusher blade which has a predetermined distance from the upper crusher blade and which is spaced apart from the space. Therefore, foreign matter such as twig can be crushed at two places of upper crushing blade and lower crushing blade, and foreign matter such as twig is crushed at the longest distance between upper crushing blade and lower crushing blade, It can be discharged to the outside of the trainer main body quickly through the discharge port.

  Further, in the space between the upper crushing blade and the lower crushing blade, the crusher is provided with a partition fixed in the radial direction centering around the rotation axis and a connecting rod connecting both ends to the partitions. The movement of the foreign substance such as a twig that is moved by being pressed by the crushing blade that is rotated by the partition wall and the connecting rod is restrained, and the cutting force of the rotating upper crushing blade and the lower crushing blade is exerted on the certain foreign material Foreign matter can be crushed reliably.

  According to the invention of claim 4, since the upper crushing blade is a rotary blade and the lower crushing blade is a disk crushing blade having a large number of insertion holes, the shapes of upper and lower crushing blades are changed. Foreign matter such as twigs can be efficiently crushed according to the characteristics of the blade.

  That is, since the upper rotary blade can form a straight blade portion in a sharp manner, foreign matter such as a twig or the like restrained by the partition wall and the connecting rod can be easily cut and fractured. The disk crushing blade is cut by a blade formed around the insertion hole with foreign matter restrained by the partition wall and the connecting rod while holding the lower end of the foreign matter such as a twig into the insertion hole formed in a large number of disk shaped surfaces. Can be crushed.

  According to the invention as set forth in claim 5, since the upper crushing blade and the lower crushing blade can be freely replaced in response to the crushing of foreign matter such as twigs, they are mixed in with sludge and flow in When the type of foreign matter such as a twig changes, it is possible to cope easily by replacing the upper crushing blade and the lower crushing blade with appropriate tools.

It is a schematic cross section which shows one Embodiment of the strainer in this invention. It is the elements on larger scale which show the crusher part of FIG. It is a figure which shows the condition which saw the connecting rod which connected the partition which provided the partition with the crusher, and the both ends to partition from the AA direction. It is the figure which looked at the crusher whose upper crushing blade is a rotary blade blade and whose lower crushing blade is a disk crushing blade from the AA direction. The upper crushing blade and the lower crushing blade are the figures which looked at the crusher which is a rotary blade from the AA direction.

Hereinafter, an embodiment of a strainer in the present invention will be described in detail based on the drawings.
FIG. 1 is a schematic cross-sectional view showing an embodiment of a strainer in the present invention, and FIGS. 2 and 3 are partially enlarged views showing a crusher portion of the strainer in the present invention.

  According to FIG. 1, the strainer 11 according to the present invention accommodates in the cylindrical strainer main body 12 an inlet 13 through which the water to be treated flows, and a filtering element 14 that filters the water to be treated flowing from the inlet 13. A filtration chamber 15, an outlet 16 through which the treated water (clean water) filtered by the filtration element 14 is made to flow out of the filtration chamber 15 to the outside of the strainer main body 12, a discharge chamber 17 provided at the lower part of the filtration chamber 15, A discharge port 18 communicated with the chamber 17 is provided, and at the bottom of the filter element 14, a crusher 19 that crushes foreign matter such as a twig is provided facing the discharge chamber 17.

  The filter element 14 is formed in a vertical cylindrical shape having openings 21 and 22 at the top and the bottom, and the water to be treated that has flowed inward from the opening 21 at the top is allowed to pass toward the outer filtration chamber 15 , Is configured to remove sludge. The filtration element 14 can be manufactured by appropriately selecting a punching plate, a wedge wire, a wire mesh or the like according to the sludge to be filtered. In this embodiment, the filtration element is manufactured using a punching plate (φ 3 mm) made of SUS304 material.

  The crusher 19 is provided rotatably at an opening 22 opened at the bottom of the filter element 14 via a pivot shaft 23 axially mounted for the strainer main body 12 and facing the discharge chamber 17. . The pivoting shaft 23 is axially mounted on the strainer main body 12 and is for attaching and rotating a brush 24 and a scraper 25 for scraping off sludge attached to the inner periphery of the filtration element 14. The crusher 19 can be rotated without providing a dedicated drive mechanism for the crusher 19 by rotatably arranging the crusher 19 via the

  Although the brush 24 and the scraper 25 are attached to the rotating shaft 23 in FIG. 1, the combination is not limited to this, and the brush and brush, scraper and scraper, brush and suction pipe, brush and suction pipe Etc. can be appropriately selected and combined according to the sludge to be filtered.

  The pivot shaft 23 is connected to the motor 28 mounted on the top of the lid 27 that covers the upper portion of the strainer body 12 via the reduction mechanism 29 and the pivot transmission fitting 30, and is rotated by the driving force of the motor 28. Move.

  Subsequently, the crusher 19 provided in the strainer in the present invention will be described in detail with reference to FIGS. 2 and 3. The crusher 19 cuts the foreign particles such as twigs while rotating and cuts the upper crush blade 32 and the lower crush blade 33, and restraining the foreign particles such as twigs so that the upper crush blade 32 and the lower crush blades 33 It is comprised from the partition 34 and the connecting rod 35 which make it easy.

  Thus, by providing the crushing blade as a two-stage configuration of the upper crushing blade 32 and the lower crushing blade 33, the upper crushing blade 32 and the lower crushing blade 33 simultaneously discharge foreign matter such as twigs or the like on the inner peripheral side of the filtration element 14 It can be cut and crushed to a length that does not stay in the chamber 17 and discharged to the outside of the strainer main body 12 through the discharge port 18.

  For this reason, the distance L1 between the upper crushing blade 32 and the lower crushing blade 33 and the distance L2 between the lower crushing blade 33 and the bottom plate 36 of the strainer main body 12 prevent foreign matter such as twigs It is necessary to set so that it can be cut and crushed to a length that does not stay within 17. As a result, even if it is a foreign substance such as a twig having a length which can not reach the position of the upper crushing blade 32 and can not be broken by the upper crushing blade 32, it is cut and broken by the lower crushing blade 33. It can be discharged to the outside of the strainer body 12.

  The upper crushing blade 32, as shown in FIG. 4, is formed on a rotary blade having linear wings 37, has an insertion hole 38 for inserting the pivot shaft 23 at the center, and is formed in a linear shape The blade portion 37 is formed with a sharp blade portion. Further, around the central insertion hole 38, a bolt hole 40 for screwing the mounting bolt 39 is formed. In the present embodiment, the upper crushing blade 32 is made of SUS304 material.

  The lower crushing blade 33 is formed in a disk crushing blade as shown in FIG. 4 and has an insertion hole 43 for inserting the extension shaft 42 at the center, and a large number of insertion holes 44 are formed in the disk-like surface A blade portion is formed on the inner periphery of all the insertion holes 44. Around the central insertion hole 43, a bolt hole 46 for screwing the mounting bolt 45 is formed. In the present embodiment, the lower crushing blade 33 is made of SUS304 material.

  Although there is no particular reference to the diameter and formation pattern of the insertion holes 44 of the lower crushing blade 33, in this embodiment, as shown in FIG. 4, the insertion holes 44 of the same diameter are arranged on a plurality of circumferences different in radius. It formed at substantially equal intervals. The diameter of the insertion hole 44 needs to be determined appropriately according to the foreign matter such as a branch to be crushed, but not only the insertion hole of the same diameter, but also insertion holes of different diameters can be mixed.

  The reason why the upper crushing blade 32 and the lower crushing blade 33 having different shapes are adopted as described above is as follows. That is, when the upper and lower blades are used, the length of foreign matter such as a twig or the like sunk into the discharge chamber 17 of the strainer main body 12 reaches the lower crushing blade 33 but does not reach the upper crushing blade 32 In such a case, a foreign object such as a twig or the like may be kicked down by the lower crushing blade 33 as if it were foot-fed, and it may not be possible to crush it. A foreign object such as a twig or the like which has been kicked falls between the partition wall 34 and the lower crushing blade 33, which causes the lower crushing blade 33 and the like to be deformed. Therefore, in the case of a foreign matter such as a short twig, the lower end of the foreign matter such as a twig is inserted into the insertion hole 44 of the lower crushing blade 33 and the foreign matter such as a twig is supported by the insertion hole 44 to prevent falling. This is to reliably cut and crush foreign matter such as twigs.

  As shown in FIG. 2, the upper crushing blade 32 is directly attached to the pivot shaft 23, and the lower crushing blade 33 is attached to the extension shaft 42 attached to the lower end of the pivot shaft 23 by a connecting bolt 48. As described above, in the crusher 19, the brush 24 for scraping the sludge adhering to the inner peripheral side of the filtration element 14 and the rotation shaft 23 axially mounted on the strainer main body 12 for rotating the scraper 25. Since the upper crushing blade 32 and the lower crushing blade 33 are configured to be rotated, there is no need to separately provide a rotating mechanism for the crushing device 19, and the strainer 11 can be configured simply, compactly and inexpensively. Can.

  At the mounting position of the upper crushing blade 32 of the rotating shaft 23, a pair of grooves 51, 52 which are symmetrically parallel about the axial center of the rotating shaft 23 are formed from the shaft surface. The crushing blade mounting plates 53, 53 are fitted into the grooves 51, 52, and the mounting bolt 39 is inserted into the bolt insertion hole 54 of the crushing blade mounting plate 53. Then, the pivot shaft 23 is inserted into the insertion hole 38. When the mounting bolt 39 is screwed into the bolt hole 40 of 32, the upper crushing blade 32 can be mounted to the pivot shaft 23.

  At the lower end of the extension shaft 42, a pair of parallel stepped portions 56, 57 are formed symmetrically about the axial center of the extension shaft 42, and between the step portions 56, 57 and the head of the connecting bolt 48 And sandwich the crushing blade mounting plates 59, 59 for the lower crushing blade 33. When the mounting bolt 45 is inserted into the bolt insertion hole 60 of the crushing blade mounting plate 59 and the mounting bolt 45 is screwed into the bolt hole 46 of the lower crushing blade 32, the lower crushing blade 33 can be attached to the extension shaft 42.

  Since the upper crushing blade 32 is attached to the rotating shaft 23 and the lower crushing blade 33 to the extension shaft 42 by such a simple method, the crushing blade can be easily attached and detached. Arbitrarily shaped crushing blades can be freely replaced according to the crushing requirements.

  As shown in FIG. 2, the partition 34 for restraining foreign substances such as twigs when the upper crushing blade 32 and the lower crushing blade 33 are cut and crushed has the upper part of the holding ring 62 at the lower end of the filter element 14 and the pivot shaft 23. It is fixed to the partition wall holding ring 64 having the insertion hole 63 and, as shown in FIG. 3, is arranged radially around the pivot shaft 23. In the present embodiment, eight partition walls 34 are attached at an angle of 45 °. However, the number of partition walls to be disposed and the attachment angle are arbitrary, and can be appropriately changed according to the properties of foreign matter such as twigs to be crushed.

  In addition to this, as shown in FIG. 3, the eight partition walls 34 radially arranged around the partition holding ring 64 are connected to each other by the connecting rod 35 on the outer peripheral side.

  The connecting rod 35 connects the pair of partitions 34, 34 together in this way to increase the strength and rigidity of the entire partition, and also connects a branch or the like in the space 65 formed by the pair of partitions 34, 34 and the connecting rod 35. It plays the role of capturing foreign matter.

  One end of the upper part of the partition 34 is fixed to the holding ring 62 at the lower end of the filter element 14, and the other end is fixed to the partition holding ring 64 which allows the rotation of the rotation shaft 23 by inserting the rotation shaft 23 Even if the upper crushing blade 32 and the lower crushing blade 33 rotate with the rotation of the rotating shaft 23, the connecting rod 35 connecting the partition 34 and the partitions 34 maintains the stopped state. Therefore, the foreign matter such as the branch which has been pushed and moved by the rotating upper crushing blade 32 or the lower crushing blade 33 is restricted in movement by the partition 34, but the upper crushing blade 32 or the lower crushing blade 33 rotates. Since it continues, foreign materials, such as a branch, will be cut and crushed by the blade part of the upper crushing blade 32 or the lower crushing blade 33. As shown in FIG.

  Further, the connecting rod 35 is prevented from escaping in the outer peripheral direction when a foreign substance such as a branch is moved by being pushed by the upper crushing blade 32 or the lower crushing blade 33 and a pair of partition walls 34, 34 and the connecting rod 35 By continuing capturing in the space 65 to be formed, movement of foreign matter such as branches is surely restricted by the partition wall 34, and cutting and crushing can be performed by the upper crushing blade 32 or the lower crushing blade 33.

  The height of the partition wall 34 is set to be substantially equal to the distance between the upper crushing blade 32 and the lower crushing blade 33, as shown in FIG. The foreign material such as branches is cut and crushed when the crushing blade cuts and breaks foreign matter such as branches, even for foreign matter such as short branches or the like that does not reach the upper crushing blade 32. It has the effect of regulating and restraining.

  The method of fixing the partition 34 to the holding ring 62 at the lower end of the filter element 14 can be performed by various methods, but in consideration of maintenance and replacement of the upper crushing blade 32, it is not a permanent bonding method but removal. Preference is given to possible methods. As a removable method, for example, a mounting bracket is provided on the partition wall 34, and the mounting bracket and the holding ring 62 at the lower end of the filter element 14 are bolted or a mounting ring connecting the upper outer periphery of each partition wall is provided. The mounting ring can be screwed on and fixed to the holding ring 62 at the lower end of the filter element 14, or can be fixed by a bayonet method.

  Since the crusher 19 configured as described above is provided at the bottom of the filtration unit 14 in a state in which substantially the whole of the crusher 19 protrudes into the discharge chamber 17 as shown in FIG. The foreign material 68 which has been cut and crushed by the blade 33 can be immediately discharged from the discharge port 18 connected to the discharge chamber 17.

  As described above, the lower crushing blade is considered to be a disk crushing blade, which is advantageous for reliably cutting and crushing foreign matter such as branches, but it may be the object of cutting and crushing depending on the installation facility of the strainer. Since foreign substances are different, as shown in FIG. 5, a rotary blade may be used as the lower crushing blade 67 as well. In the drawing, the upper crushing blade 32 and the lower crushing blade 67 are mounted in a state of being orthogonal to each other, but the mounting of the upper crushing blade 32 and the lower crushing blade 67 is not limited to the orthogonal condition, and the crushing object is It can be set arbitrarily according to the nature of the foreign matter.

Subsequently, the operation and effects of the strainer of the present invention will be described below.
The treated water pressurized and supplied by the water intake pump (not shown) continuously flows into the inflow port 13 of the strainer 11. The water to be treated which has flowed into the strainer body 12 through the inlet 13 flows from the opening 21 at the top of the filter element 14 to the inner peripheral side of the filter element 14 and passes the filter element 14 from the inside to the outside. The sludge is filtered to become clean water, and flows out to the filtration chamber 15.

  At this time, since the drain valve (not shown) provided downstream of the discharge port 18 provided at the bottom of the strainer main body 12 is in a closed state, clean water in the filtration chamber 15 is connected via the outlet 16 connected to the filtration chamber 15 It flows out from the strainer main body 12 and is supplied to a cooling system or the like using clean water.

  If the strainer 11 continues to operate, the amount of sludge adhering to the inner peripheral side of the filter element 14 increases when filtering the treated water, causing clogging and reducing the filtration capacity, and the inlet 13 and the outlet The differential pressure between 16 increases. When the increase in the differential pressure exceeds a certain standard, the brush 28 attached to the rotating shaft 23 is driven by driving the motor 28 in order to scrape the sludge adhering to the inner peripheral side of the filter element 14 and recover the filtration capacity. And scraper 25 to remove attached sludge.

  In addition, if the drain valve (not shown) provided downstream of the discharge port 18 is opened and opened to the atmospheric pressure simultaneously with the rotation of the brush 24 and the scraper 25, the inside of the strainer main body 12 is pressurized by the intake pump and supplied Because it is filled with treated water, the treated water in the strainer main body 12 is discharged to the outside from the discharge port 18 due to the differential pressure with the atmospheric pressure, and the brush 24 and the scraper 25 together with the discharged treated water. The sludge scraped off is also discharged to the outside.

  The timing at which the sludge adhering to the inner peripheral side of the filtration element 14 is scraped off by the brush 24 and the scraper 25 and discharged to the outside of the strainer main body 12 is the inflow port 13 and the outflow port 16 as described above. The differential pressure between them may be set as a reference, or the operating time of the strainer 11 may be set as a reference. In addition to the motor, a manual handle can be used as a driving force for rotating the brush 24 and the scraper 25.

  The above is the basic operation of the strainer 11. However, if foreign matter such as a twig is mixed with the sludge into the water to be treated sent to the strainer 11, the foreign matter 68 from the opening 22 in the bottom of the filtration element 14 It may sink into the discharge chamber 17.

  When the length of the foreign matter is short enough to be discharged from the discharge port 18, the foreign matter sinks into the discharge chamber 17 through the opening 22 at the bottom of the filter element 14 and remains as described above. When the sludge attached to the inner peripheral side of the element 14 is scraped and removed, when the drain valve provided downstream of the discharge port 18 is opened, the drain water is discharged together with the treated water discharged from the strainer main body 12.

  On the other hand, when the foreign matter 68 has a certain length, the foreign matter 68 sinks into the discharge chamber 17 from the opening 22 at the bottom of the filter element 14, but as shown in FIG. The other end of the front end of the rear end remains on the inner peripheral side of the filtration element 14 even when the front end of the front end contacts the surface of the bottom plate 36.

  In such a state, if the strainer is not provided with a crusher, even if the brush 24 and the scraper 25 are rotated, the foreign matter 68 can not be affected in any way, and the drain valve downstream of the discharge port 18 The foreign matter 68 of a length which can not pass through the discharge port 18 remains inside the strainer body 12 even if it is opened. Furthermore, the sludge which is scraped off by the brush 24 and the scraper 25 and which is going to flow out from the outlet 18 together with the water to be treated is entangled in the foreign matter 68, and the sludge which is entangled in the foreign matter grows every time the sludge is scraped. It will be.

  When the sludge that has become entangled with the foreign matter 68 grows, not only the sludge can not be discharged sufficiently, but the sludge separated from the foreign matter again adheres to the filter element 14 and the reduction of the filtration capacity of the filter element 14 occurs early. become.

  On the other hand, in the strainer 11 of the present invention provided with the crusher 19 at the bottom of the filter element 14, foreign matter 68 of a length in which one end contacts the bottom plate 36 and the other end stays on the inner peripheral side of the filter element 14. Even in this case, it can be cut and crushed to a length that can flow out from the discharge port 18 and can be discharged from the discharge port 18 to the outside of the strainer main body 12.

  That is, when the foreign matter 68 sinks into the discharge chamber 17 from the opening 22 at the bottom of the filter element 14 and the foreign matter 68 is inserted into the insertion hole 44 of the lower crushing blade 33 as shown in FIG. When the moving shaft 23 is rotated, the upper crushing blade 32 and the lower crushing blade 33 are also rotated together with the brush 24 and the scraper 25. Along with the rotation of the upper crushing blade 32 and the lower crushing blade 33, the foreign matter 68 is pushed by the upper crushing blade 32 and the lower crushing blade 33 and moves around the rotation shaft 23.

  On the other hand, since the partition wall 34 is stationary, the foreign object 68 moved around the pivot shaft 23 by being pushed by the upper crushing blade 32 and the lower crushing blade 33 can not move when it abuts against the partition wall 34 and is restrained. As a result, the blade portions of the upper crushing blade 32 and the lower crushing blade 33 which continue to rotate bite into a portion in contact with the foreign matter 68, and finally the foreign matter 68 is cut and crushed at the portion.

  Thus, the foreign matter 68 cut and crushed to a length that can be discharged from the discharge port 18 is discharged to the outside of the strainer main body 12 together with the water to be treated flowing out from the discharge port 18, and the foreign matter remains in the discharge chamber 17. There is no

  Thus, in the strainer of the present invention, the sludge adhering to the inner peripheral surface of the filtration element 14 is an brush with the scraper 25 by the operation method which does not add any special operation to the operation method of the strainer without the conventional crusher. The sludge that has been scraped off and removed, and foreign substances such as twigs that flow into the strainer body 12 and sink into the discharge chamber 17 are cut, crushed, and scraped into lengths that can be discharged from the discharge port 18 by the crusher 19 Can be discharged from the discharge port 18 to the outside of the strainer main body 12 together with

  Although FIG. 2 shows the foreign material 68 inserted into one of the insertion holes 44 of the lower crushing blade 33, when the foreign material is cut and crushed by the crusher 19, the foreign material 68 is crushed in the lower part. Being inserted into the insertion hole 44 of the blade 33 is not an essential requirement. Even if the lower end portion of the foreign matter 68 is on the upper surface of the lower crushing blade 33, the foreign matter 68 can be cut and crushed with only the upper crushing blade 32, and the foreign matter 68 is discharged by repeating this sequentially. It can also be cut and crushed to a length that can be discharged from 18.

  Further, even when the lower end portion of the foreign matter 68 is placed on the upper surface of the lower crushing blade 33, the foreign matter 68 is abutted against the partition wall 34 and restrained as the upper crushing blade 32 and the lower crushing blade 33 rotate. At that time, there is a high possibility that the lower end portion of the foreign matter 68 falls into any one of the insertion holes 44 opened in the lower crushing blade 33 in large numbers, and the lower crushing blade 33 cuts and breaks it.

  Thus, in the strainer of the present invention, since foreign matter such as a branch does not stay in the discharge chamber, the sludge scraped off by the scraping member or the like entangles and grows on foreign matter such as a branch sunk into the discharge chamber. The reduction of the filtration capacity of the filtration element does not occur because the grown sludge adheres to the filtration element again.

  In addition, even though it is an automatic strainer with an extremely long maintenance interval, foreign matter that can not be discharged from the discharge port flows into the strainer, so the use of the strainer is stopped at any time and the filtration element is taken out of the strainer. There is no need to perform troublesome cleaning work for removing sludge and foreign matter accumulated in the discharge chamber, and the operation rate of the strainer can be greatly improved.

  As is apparent from the above description, in the strainer according to the present invention, the upper crusher and the lower crusher of the crusher are configured to be pivoted through the pivoting shaft conventionally supported by the strainer body. Thus, there is no need to separately provide a rotating mechanism for the crusher, and the strainer can be configured simply, compactly and inexpensively. Also, in the same operation method as the conventional strainer operation method, the sludge adhering to the inner peripheral surface of the filtration element is scraped off and removed, and at the same time the foreign matter that has flowed into the strainer body and sinks into the bottom is cut by a crusher. The crushed and scraped sludge and the cut and crushed foreign matter can be discharged from the discharge port to the outside.

11 strainer 12 strainer main body 13 inlet 14 filtration element 15 filter chamber 16 outlet 17 exhaust chamber 18 outlet 19 crusher 23 rotary shaft 32 upper crushing blade 33 lower crushing blade 34 partition 35 connecting rod 42 extension shaft 48 connecting bolt

Claims (5)

  In the cylindrical strainer main body, a cylindrical filtration element in which the water to be treated flows in from the inlet and filters, a filtration chamber for filtering the filter element from the filtration element to the outer peripheral side, and a flow for discharging the filtered water from the filtration chamber A strainer having an outlet, wherein a bottom of the filter element is provided with a crusher for breaking up foreign matter such as a twig.   The crusher is rotatably provided at an opening opened at the bottom of the filtration element via a pivot shaft pivotally mounted for the strainer main body, and the crusher is a discharge provided at the lower portion of the strainer main body The strainer according to claim 1, wherein the strainer faces the chamber and is in communication with an outlet provided at a lower portion of the strainer body.   The crusher includes an upper crusher blade which is pivoted through a pivot shaft, a lower crusher blade which is spaced apart from the upper crusher blade by a predetermined distance, and has a pivot shaft in the space portion. The strainer according to claim 1 or 2, further comprising: a partition fixed in the center in the radial direction; and a connecting rod connecting both ends to the partitions.   The strainer according to any one of claims 1 to 3, wherein the upper crushing blade is a rotary blade and the lower crushing blade is a disk crushing blade having a plurality of insertion holes.   The strainer according to any one of claims 1 to 4, wherein the upper crusher blade and the lower crusher blade are provided with an optional crusher blade corresponding to the crush of foreign matter such as a twig.

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