JP7125689B2 - strainer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a strainer for filtering water containing various foreign matter (hereinafter referred to as sludge) to remove sludge, and more particularly, to a strainer for removing sludge, such as foreign matter such as twigs mixed in with sludge. It relates to a strainer with a crusher at the bottom for crushing.

Many industrial facilities use river water as industrial water, but hydroelectric power plants also generally use water-cooling systems to cool the bearings of water turbine generators and pressure oil/lubricating oil systems. Water taken from a water tank is used as cooling water. This cooling water requires clean water, but the water taken from rivers and outdoor water tanks contains sludge such as dust and fallen leaves. , a strainer is provided in the middle of the cooling water system.

The strainer has a filter element provided in the strainer body through which the water to be treated flows. Water that has been filtered to remove sludge is supplied.

As a result, the trapped sludge adheres to the filter element in the strainer body, and if left unchecked, the pressure loss increases, making it impossible to obtain the required flow rate. In order to prevent such a situation, it is necessary to remove the sludge adhering to the filter element to restore the filtering ability of the filter element.

For this reason, a strainer has been proposed that automatically removes the sludge adhering to the filter element during operation of the strainer to restore the filtering ability of the filter element. Alternatively, driving blades are arranged on the outer peripheral side, and the driving force when the driving blades are rotationally driven in the circumferential direction of the filtration element backwashes the filtration element with filtered water in the filtration tank, and the filtration element Strainers have been proposed to remove deposited sludge.

In Patent Document 2, a scraping body having a scraping member attached to the tip portion is rotatably provided inside a filter element, and a small gap is set between the inner peripheral surface of the filter element and the scraping member. A strainer has been proposed in which a water flow is generated in the vicinity of the inner peripheral surface of a filter element by rotating a scraping body, and the water flow removes sludge adhering to the filter element.

Further, in Patent Document 3, a backwashing pipe that is driven to rotate by a rotating shaft is provided inside the filtration element, and by opening the backwashing pipe to atmospheric pressure, sludge adhering to the filtration element and precipitated at the bottom of the strainer are removed. Strainers have been proposed to remove the sludge that has accumulated.

Further, in Patent Document 4, brushes are provided along the inner and outer peripheral surfaces of the filter element to contact substantially the entire axial length of the filter element, and the filter element is interlocked with the central rotating shaft. Strainers have been proposed that are configured to rotate to remove sludge from the filter element.

JP 2003-181214 A JP-A-8-80405 JP-A-7-136421 JP-A-1-94908

The strainers disclosed in Patent Documents 1 to 4 can automatically remove sludge adhering to the filter element and discharge the removed sludge out of the strainer to recover the filtering ability of the filter element.

However, water taken from rivers and outdoor water tanks (hereinafter referred to as water to be treated) contains sludge as well as foreign substances such as twigs and peeled bark (hereinafter referred to as twigs, etc.). and sink into the bottom of the strainer below the filter element.

In particular, when relatively long twigs or the like sink into the bottom of the strainer body, they cannot be discharged from the sludge discharge port provided at the bottom of the strainer body, and may remain at the bottom. Foreign matter such as small twigs cannot be dealt with by the strainer proposed in the above document, which automatically removes and discharges sludge adhering to the filter element.

If twigs or the like sink into the bottom of the strainer body and remain there, the sludge scraped off by the scraping member or the like will get entangled in the twigs and accumulate at the bottom of the strainer body. The sludge that is separated from the entangled state may adhere to the filter element again and reduce the filtering capacity of the filter element at an early stage.

Therefore, the sludge adhering to the filter element can be automatically removed and discharged, and although the strainer can be used maintenance-free for a long period of time, the use of the strainer can be stopped at any time and the filter element can be removed from the outside of the strainer body. It requires a troublesome cleaning operation to remove sludge, twigs, etc. that have sunk into the bottom of the strainer body and accumulated.

Also, if the twigs or the like that have sunk into the bottom of the strainer body flow out of the strainer body for some reason, they may damage important equipment provided on the secondary side of the strainer.

The present invention was developed in order to solve the above-mentioned problems, and its object is to automatically crush and discharge foreign matter such as twigs mixed in with the sludge and flowing to the outside. To provide a strainer which prevents sludge scraped by a scraping member or the like from staying inside and lowering the filtering capacity of a filtering element, and which does not damage important equipment provided on the secondary side. It is in.

In order to achieve the above object, the invention according to claim 1 has a cylindrical strainer body, a cylindrical filter element for filtering water to be treated which flows in from an inflow port, and a filter element which filters water from the filter element to the outer peripheral side. and a strainer having an outlet through which filtered water flows out from the filtration chamber. an upper crushing blade, a lower crushing blade provided at a predetermined distance from the upper crushing blade and separated by a space, partition walls fixed in the space in a radial direction about the rotation shaft, and both ends The strainer includes connecting rods connected to the partition walls .

In the invention according to claim 2, the crusher is rotatably provided in an opening formed in the bottom of the filter element via a rotation shaft mounted on the strainer body, and the crusher is mounted on the strainer body. The strainer faces a discharge chamber provided at the bottom of the strainer and communicates with a discharge port provided at the bottom of the strainer body.

The invention according to claim 3 is a strainer in which the upper crushing blade is a rotor blade, and the lower crushing blade is a disc crushing blade having a large number of insertion holes.

The invention according to claim 4 is a strainer in which the upper crushing blade and the lower crushing blade are exchangeably provided with arbitrary crushing blades corresponding to the crushing of foreign substances such as twigs.

According to the first aspect of the invention, since the crusher for crushing foreign matter such as twigs is provided at the bottom of the filter element, the filter element has a length that allows foreign matter such as twigs and the like mixed in with the sludge to be discharged from the discharge port. It can be crushed into small pieces and discharged from the strainer body through the discharge port.

In addition, since foreign matter such as twigs does not remain in the discharge chamber, sludge scraped by a scraping member or the like does not accumulate in the discharge chamber. There is no deterioration in the filtering capacity of the filter.

Therefore, the troublesome cleaning work of stopping the use of the strainer at any time, removing the filter element from the strainer, and removing sludge, twigs, etc. accumulated in the discharge chamber of the strainer is not required. Furthermore, foreign matter such as twigs can be crushed at two locations, the upper crushing blade and the lower crushing blade. An upper crushing blade that can be discharged to the outside of the trainer body through the discharge port, and restrains the movement of foreign matter such as twigs pushed by the rotating crushing blade by the partition wall and the connecting rod. The cutting force of the lower crushing blade can be reliably applied to foreign matter, and foreign matter such as twigs can be reliably crushed.

According to the second aspect of the invention, the crusher is rotatably provided through the rotation shaft mounted on the strainer main body in the opening formed in the bottom of the filter element. It is possible to drive the crusher through the rotating shaft mounted on the strainer body without providing the strainer body, thereby crushing foreign objects such as twigs.

In addition, since the crusher is provided facing the discharge chamber and the discharge chamber communicates with the discharge port, foreign substances such as twigs crushed by the crusher do not remain in the discharge chamber and can be immediately discharged through the discharge port. can be discharged to the outside of the strainer body.

According to the third aspect of the invention, the upper crushing blade is a rotor blade, and the lower crushing blade is a disc crushing blade with a large number of insertion holes. Foreign matter such as twigs can be efficiently crushed according to the characteristics of the blade.

That is, since the upper rotor blade can be formed with a sharp linear blade, it can easily cut and crush foreign matter such as twigs restrained by the partition wall and the connecting rod. The disc crushing blade cuts the foreign matter restrained by the partition wall and the connecting rod by the blade part formed around the insertion hole while dropping the lower end of the foreign matter such as a twig into the insertion hole drilled in the disk-shaped surface and holding it. can be crushed by

According to the fourth aspect of the invention, the upper crushing blade and the lower crushing blade can be exchangeably provided in correspondence with the crushing of foreign matter such as twigs, so that the crushing blade is mixed with the sludge and flows into the sludge. When the type of foreign matter such as a twig changes, it can be easily dealt with by appropriately replacing the upper crushing blade and the lower crushing blade .

It is a schematic cross section showing one embodiment of a strainer in the present invention. FIG. 2 is a partially enlarged view showing the crusher portion of FIG. 1; FIG. 4 is a diagram showing a state of partition walls provided in the crusher and a connecting rod having both ends connected to the partition walls as viewed in the AA direction. FIG. 2 is a view of a crusher in which the upper crushing blade is a rotor blade and the lower crushing blade is a disc crushing blade, viewed from the AA direction. FIG. 2 is a view of the crusher in which both the upper crushing blade and the lower crushing blade are rotary wing blades, viewed from the AA direction.

EMBODIMENT OF THE INVENTION Below, embodiment of the strainer in this invention is described in detail based on drawing.
FIG. 1 is a schematic cross-sectional view showing an embodiment of a strainer according to the present invention, and FIGS. 2 and 3 are partially enlarged views showing a crusher portion of the strainer according to the present invention.

According to FIG. 1, a strainer 11 according to the present invention contains an inlet 13 into which water to be treated flows into a cylindrical strainer body 12, and a filtering element 14 to filter the water to be treated that has flowed in from the inlet 13. Filtration chamber 15, outflow port 16 through which water to be treated (clean water) filtered by filtration element 14 flows from filtration chamber 15 to the outside of strainer body 12, discharge chamber 17 provided at the bottom of filtration chamber 15, and discharge The filter element 14 has a discharge port 18 communicating with the chamber 17 , and a crusher 19 facing the discharge chamber 17 for crushing foreign matter such as twigs at the bottom of the filter element 14 .

Filtration element 14 is configured in a vertical cylindrical shape having openings 21 and 22 at the top and bottom, and allows the water to be treated that has flowed inside from opening 21 at the top to pass through toward filtration chamber 15 on the outside. , configured to remove sludge. The filtering element 14 can be manufactured by appropriately selecting a punching plate, a wedge wire, a wire mesh, etc. according to the sludge to be filtered. In this embodiment, a punching plate (φ3 mm) made of SUS304 material is used to manufacture the filtering element.

The crusher 19 is rotatably provided in an opening 22 opened at the bottom of the filter element 14 via a rotation shaft 23 mounted on the strainer body 12 and facing the discharge chamber 17 . . A rotary shaft 23 is mounted on the strainer body 12 and is used to attach and rotate a brush 24 and a scraper 25 for scraping off sludge adhering to the inner periphery of the filter element 14 . By rotatably providing the crusher 19 via the , the crusher 19 can be rotated without providing a dedicated drive mechanism for the crusher 19 .

In FIG. 1, the brush 24 and the scraper 25 are attached to the rotating shaft 23, but the combinations are not limited to this, and include brush and brush, scraper and scraper, brush and suction pipe, scraper and suction pipe. etc. can be appropriately selected and combined according to the sludge to be filtered.

The rotary shaft 23 is connected via a speed reduction mechanism 29 and a rotary transmission metal fitting 30 to a motor 28 mounted on the top of a lid 27 that covers the upper portion of the strainer body 12 . move.

Next, the crusher 19 provided in the strainer according to the present invention will be described in detail with reference to FIGS. 2 and 3. FIG. The crusher 19 has an upper crushing blade 32 and a lower crushing blade 33 that cut and crush foreign matter such as twigs while rotating, and an upper crushing blade 32 and a lower crushing blade 33 that constrain foreign substances such as twigs and cut them. It consists of a bulkhead 34 and a connecting rod 35 which facilitates.

By providing the crushing blades in a two-stage configuration of the upper crushing blade 32 and the lower crushing blade 33 in this way, the upper crushing blade 32 and the lower crushing blade 33 simultaneously discharge foreign matter such as twigs to the inner peripheral side of the filtering 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 body 12 are set so that foreign substances such as twigs are removed from the inner peripheral side of the filtering element 14 and the discharge chamber. It should be set so that it can be cut and crushed to a length that does not stay within 17 . As a result, even foreign objects such as twigs that do not reach the position of the upper crushing blade 32 and cannot be crushed by the upper crushing blade 32 can be cut and crushed by the lower crushing blade 33 and discharged through the discharge port 18. It can be discharged to the outside of the strainer main body 12 .

As shown in FIG. 4, the upper crushing blade 32 is formed as a rotary blade blade having a linear wing portion 37, and has an insertion hole 38 in the center through which the rotating shaft 23 is inserted, and is formed linearly. A sharp blade portion is formed on the wing portion 37 . A bolt hole 40 for screwing a mounting bolt 39 is formed around the center insertion hole 38 . In this embodiment, the upper crushing blade 32 is made of SUS304 material.

As shown in FIG. 4, the lower crushing blade 33 is formed into a disc crushing blade, has an insertion hole 43 in the center through which the extension shaft 42 is inserted, and has a large number of insertion holes 44 formed on the surface of the disc. , a blade portion is formed on the inner periphery of all the insertion holes 44 . A bolt hole 46 into which a mounting bolt 45 is screwed is formed around the center insertion hole 43 . In this embodiment, the lower crushing blade 33 is made of SUS304 material.

Although there is no particular standard for the diameter and formation pattern of the insertion holes 44 of the lower crushing blade 33, in this embodiment, as shown in FIG. They were formed at approximately equal intervals. The diameter of the insertion hole 44 needs to be appropriately determined according to foreign objects such as branches to be crushed, but not only insertion holes with the same diameter but also insertion holes with different diameters can be mixed.

The reason for adopting the upper crushing blade 32 and the lower crushing blade 33 having different shapes is as follows. That is, when rotary blades are used for both the upper and lower blades, the length of foreign matters such as twigs sunk into the discharge chamber 17 of the strainer body 12 reaches the lower crushing blade 33 but does not reach the upper crushing blade 32. In some cases, a foreign object such as a twig is kicked down by the lower crushing blade 33 like a foot sweep, and cannot be crushed. A foreign object such as a kicked twig is caught between the partition wall 34 and the lower crushing blade 33, causing deformation of the lower crushing blade 33 and the like. For this reason, in the case of a short twig or other foreign matter, the lower end of the twig or other foreign matter is inserted into the insertion hole 44 of the lower crushing blade 33, and the insertion hole 44 supports the foreign matter such as the twig so that it does not fall down. This is for reliably cutting and crushing foreign substances such as twigs.

As shown in FIG. 2, the upper crushing blade 32 is directly attached to the rotating shaft 23, and the lower crushing blade 33 is attached to an extension shaft 42 attached to the lower end of the rotating shaft 23 with a connecting bolt 48. As shown in FIG. Thus, in the crusher 19, the brush 24 for scraping off the sludge adhering to the inner peripheral side of the filter element 14 and the scraper 25 are rotated. Since the upper crushing blade 32 and the lower crushing blade 33 are configured to rotate through the crusher 19, there is no need to separately provide a rotating mechanism for the crusher 19, and the strainer 11 can be configured simply, compactly, and inexpensively. can be done.

A pair of parallel grooves 51 and 52 symmetrically about the axis of the rotating shaft 23 are formed on the surface of the rotating shaft 23 at the mounting position of the upper crushing blade 32 . The crushing blade mounting plates 53, 53 are fitted into the grooves 51, 52, the mounting bolts 39 are inserted into the bolt insertion holes 54 of the crushing blade mounting plate 53, and then the rotation shafts 23 are inserted into the insertion holes 38, and the upper crushing blades are mounted. The upper crushing blade 32 can be attached to the rotating shaft 23 by screwing a mounting bolt 39 into the bolt hole 40 of 32 .

A pair of parallel stepped portions 56 and 57 are formed at the lower end of the extended shaft 42 symmetrically about the axis of the extended shaft 42 . , and the crushing blade mounting plates 59, 59 for the lower crushing blade 33 are held. The lower crushing blade 33 can be attached to the extension shaft 42 by inserting the mounting bolt 45 into the bolt hole 60 of the crushing blade mounting plate 59 and then screwing the mounting bolt 45 into the bolt hole 46 of the lower crushing blade 32 .

Since the upper crushing blade 32 is attached to the rotation shaft 23 and the lower crushing blade 33 is attached to the extension shaft 42 by such a simple method, the crushing blades can be easily attached and detached, and foreign matter such as twigs can be removed. The crushing blades of any shape can be freely exchanged according to crushing requirements.

As shown in FIG. 2, the partition wall 34, which restrains foreign objects such as twigs when the upper crushing blade 32 and the lower crushing blade 33 cut and crush, is formed between the holding ring 62 at the lower end of the filter element 14 and the rotating shaft 23, as shown in FIG. It is fixed to a partition wall holding ring 64 having an insertion hole 63, and is arranged radially around the pivot shaft 23 as shown in FIG. In the present embodiment, eight partition walls 34 are attached at every angle of 45°, but the number and attachment angle of the partition walls to be arranged are arbitrary and can be appropriately changed according to the properties of foreign objects such as twigs to be crushed.

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

The connecting rod 35 connects the pair of partition walls 34 , 34 to each other in this way to increase the strength and rigidity of the partition walls as a whole. It plays a role in catching foreign objects.

One end of the upper portion of the partition wall 34 is fixed to a retaining ring 62 at the lower end of the filter element 14, and the other end is fixed to a partition wall retaining ring 64 through which the rotating shaft 23 is inserted to allow rotation of the rotating shaft 23. Even if the upper crushing blade 32 and the lower crushing blade 33 rotate with the rotation of the rotary shaft 23, the connecting rod 35 connecting the partitions 34 to each other maintains a stopped state. Therefore, foreign objects such as branches pushed by the rotating upper crushing blade 32 or lower crushing blade 33 are restricted in movement by the partition wall 34, but the upper crushing blade 32 or lower crushing blade 33 does not rotate. Since the operation continues, the blade portion of the upper crushing blade 32 or the lower crushing blade 33 cuts and crushes foreign substances such as branches.

In addition, the connecting rod 35 prevents foreign substances such as branches from escaping in the outer peripheral direction when they are pushed by the upper crushing blade 32 or the lower crushing blade 33 and move. By continuing to capture in the formed space 65 , the movement of foreign matter such as branches is reliably restricted by the partition wall 34 so that the upper crushing blade 32 or the lower crushing blade 33 can cut and crush them.

As shown in FIG. 2, 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, so that the upper crushing blade 32 can cut and crush the branches. , and foreign objects such as branches with a short length that cannot be reached by the upper crushing blade 32, the movement of foreign objects such as branches is prevented when the crushing blade cuts and crushes foreign objects such as branches. It has a regulating and binding effect.

Various methods can be used to fix the partition wall 34 to the retaining ring 62 at the lower end of the filter element 14. However, when maintenance or replacement of the upper crushing blade 32 is taken into consideration, it is not a permanent connection method, but a removable method. By any available method, it is preferred. As a detachable method, for example, a mounting bracket is provided on the partition wall 34, and this mounting bracket is bolted to the retaining ring 62 at the lower end of the filter element 14, or a mounting ring is provided to connect the upper outer periphery of each partition wall, This mounting ring may be fixed by screwing it onto the retaining ring 62 at the lower end of the filter element 14, or may be fixed by a bayonet method.

As shown in FIG. 2, the crusher 19 configured as described above is provided at the bottom of the filter unit 14 in a state in which substantially the entirety thereof protrudes into the discharge chamber 17, so that the upper crushing blade 32 and the lower crushing blade The foreign matter 68 cut and crushed by the blade 33 can be immediately discharged from the discharge port 18 connected to the discharge chamber 17 .

As mentioned above, it is considered advantageous for the lower crushing blade to be a disk crushing blade for reliably cutting and crushing foreign matter such as branches, but depending on the facility where the strainer is installed, it may be subject to cutting and crushing. Since foreign matter is different, a rotor blade may also be used for the lower crushing blade 67 as shown in FIG. In this figure, the upper crushing blade 32 and the lower crushing blade 67 are attached in a perpendicular state, but the attachment of the upper crushing blade 32 and the lower crushing blade 67 is not limited to the perpendicular state, and the crushing object is It can be arbitrarily set according to the properties of the foreign matter.

Next, the action and effect of the strainer of the present invention will be explained below.
Water to be treated, which is pressurized and sent by a water intake pump (not shown), continuously flows into the inflow port 13 of the strainer 11 . The water to be treated that has flowed into the strainer body 12 through the inflow port 13 flows into the inner peripheral side of the filter element 14 from the opening 21 at the top of the filter element 14, and passes through the filter element 14 from the inside to the outside. After the sludge is filtered, it becomes clean water and flows out to the filtration chamber 15 .

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

If the operation of the strainer 11 is continued, the amount of sludge adhering to the inner peripheral side of the filter element 14 when filtering the water to be treated increases and clogs the filter element 14, which lowers the filtering capacity. The differential pressure between 16 increases. When the increase in the differential pressure exceeds a certain standard, the brush 24 attached to the rotating shaft 23 is driven by the motor 28 in order to scrape off the sludge adhering to the inner peripheral side of the filter element 14 and recover the filtering capacity. and rotate the scraper 25 to remove the attached sludge.

At the same time when the brush 24 and the scraper 25 are rotated, a drain valve (not shown) provided downstream of the discharge port 18 is opened to release the pressure to the atmospheric pressure. Since the strainer body 12 is filled with treated water, the treated water in the strainer body 12 is discharged outside from the discharge port 18 due to the pressure difference from the atmospheric pressure, and the brush 24 and the scraper 25 are discharged together with the discharged treated water. The sludge scraped by is also discharged outside.

The timing of removing the sludge adhering to the inner peripheral side of the filter element 14 by scraping it with the brush 24 and the scraper 25 and discharging it to the outside of the strainer main body 12 is determined as described above. It is also possible to set based on the differential pressure between them, or based on the operation time of the strainer 11 . A manual handle can also be used as a driving force for rotating the brush 24 and the scraper 25 in addition to the motor.

The basic operation of the strainer 11 has been described above. It may sink into the discharge chamber 17 .

If 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 stays therein. When the drain valve provided downstream of the discharge port 18 is opened to scrape off the sludge adhering to the inner peripheral side of the element 14 , the sludge is discharged together with the water to be treated discharged from the strainer main body 12 .

On the other hand, if the foreign matter 68 has a certain length, the foreign matter 68 sinks into the discharge chamber 17 through the opening 22 at the bottom of the filter element 14, but as shown in FIG. The tip of the filter element 14 contacts the surface of the bottom plate 36, but the other tip remains on the inner peripheral side of the filter element 14.例文帳に追加

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 will not be affected at all. The foreign matter 68 having a length that cannot pass through the discharge port 18 remains inside the strainer main body 12 even if the opening is opened. Furthermore, the sludge scraped by the brush 24 and the scraper 25 and about to flow out from the discharge port 18 together with the water to be treated is entangled with the foreign matter 68, and each time the sludge is scraped off, the sludge entangled with the foreign matter grows. It will be.

When the sludge entwined with the foreign matter 68 grows, not only is the sludge not sufficiently discharged, but also the sludge separated from the foreign matter adheres to the filter element 14 again, resulting in early deterioration of the filtering ability of the filter element 14.例文帳に追加become.

On the other hand, in the strainer 11 of the present invention having the crusher 19 at the bottom of the filter element 14 , one tip contacts the bottom plate 36 and the other tip has a length such that the foreign matter 68 stays on the inner peripheral side of the filter element 14 . Even so, it can be cut into a length that can be discharged from the discharge port 18, crushed, and 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 is inserted into the insertion hole 44 of the lower crushing blade 33 as shown in FIG. When the drive shaft 23 is rotated, the upper crushing blade 32 and the lower crushing blade 33 are also rotated together with the brush 24 and scraper 25 . As the upper crushing blade 32 and the lower crushing blade 33 rotate, the foreign matter 68 is pushed by the upper crushing blade 32 and the lower crushing blade 33 and moves around the rotary shaft 23 .

On the other hand, since the partition wall 34 is stationary, the foreign matter 68 that is pushed by the upper crushing blade 32 and the lower crushing blade 33 and moves around the rotary shaft 23 cannot move and is restrained when it comes into contact with the partition wall 34. As a result, the blade portions of the upper crushing blade 32 and the lower crushing blade 33 that continue to rotate bite into the portion of contact with the foreign matter 68, and finally cut and crush the foreign matter 68 at that portion.

As a result, 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 filter element 14 is removed by the brush 24 and the scraper 25 by an operation method without adding any special operation to the operation method of the conventional strainer having no crusher. Sludge scraped and removed by scraping and removing foreign matter such as twigs that flowed into the strainer body 12 and sunk into the discharge chamber 17 by the crusher 19, cut, crushed and scraped to a length that can be discharged from the discharge port 18 can be discharged to the outside of the strainer main body 12 from the discharge port 18 together with the

2 shows a state in which the foreign matter 68 is inserted into one of the insertion holes 44 of the lower crushing blade 33, when the crusher 19 cuts and crushes the foreign matter, the foreign matter 68 is It is not an essential requirement that the blade 33 is inserted into the insertion hole 44 . Even if the lower end of the foreign matter 68 rests on the upper surface of the lower crushing blade 33, it is possible to cut and crush the foreign matter 68 only with the upper crushing blade 32, and by repeating this in sequence, the foreign matter 68 is removed from the outlet. 18 can also be cut and crushed into a length that can be discharged.

Further, even when the lower end of the foreign object 68 rests on the upper surface of the lower crushing blade 33, the foreign object 68 is restrained by coming into contact with the partition wall 34 as the upper crushing blade 32 and the lower crushing blade 33 rotate. At this time, there is a high possibility that the lower end of the foreign matter 68 will fall into one of the insertion holes 44 formed in the lower crushing blade 33 and be cut and crushed by the lower crushing blade 33 .

In this manner, in the strainer of the present invention, since foreign substances such as branches do not remain in the discharge chamber, the sludge scraped by the scraping member or the like is entangled with foreign substances such as branches that have sunk into the discharge chamber and grows. , the filtering capacity of the filtering element is not deteriorated due to the reattachment of the grown sludge to the filtering element.

In addition, although the automatic strainer has a very long maintenance interval, foreign matter that cannot be discharged from the discharge port flows into the strainer. It is no longer necessary to perform troublesome cleaning work to remove sludge and foreign matter accumulated in the discharge chamber of the strainer, and the operating rate of the strainer can be greatly improved.

As is clear from the above description, the strainer according to the present invention is conventionally constructed so that the upper crushing blade and the lower crushing blade of the crusher are rotated via the rotary shaft mounted on the strainer body. Therefore, there is no need to separately provide a rotating mechanism for the crusher, and the strainer can be configured simply, compactly, and inexpensively. In addition, by using the same operation method as the conventional strainer, the sludge adhering to the inner peripheral surface of the filter element is scraped off, and at the same time, the foreign matter that has flowed into the strainer body and sunk to the bottom is cut by a crusher. The crushed and scraped sludge and the cut and crushed foreign matter can be discharged to the outside through the discharge port.

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

Claims (4)

The cylindrical strainer main body includes a cylindrical filtering element for filtering the water to be treated which flows in from the inflow port, a filtering chamber for filtering the water to the outer peripheral side from the filtering element, and a flow for flowing out the filtered water from the filtering chamber. In the strainer having an outlet, a crusher for crushing foreign matters such as twigs is provided at the bottom of the filtering element, and the crusher includes an upper crushing blade that rotates via a rotary shaft, and a predetermined strainer with the upper crushing blade. Equipped with lower crushing blades spaced apart from each other by a space, partition walls fixed in the space radially about a rotating shaft, and connecting rods connecting both ends to the partition walls. A strainer characterized by: The crusher is rotatably provided in the opening formed in the bottom of the filter element via a pivot shaft mounted on the strainer body, and the crusher is provided at the bottom of the strainer body. 2. The strainer according to claim 1, which faces the chamber and communicates with a discharge port provided at the bottom of the strainer body. 2. The strainer according to claim 1 , wherein said upper crushing blade is a rotor blade and said lower crushing blade is a disc crushing blade with multiple insertion holes. 2. The strainer according to claim 1, wherein said upper crushing blade and said lower crushing blade are exchangeably provided with arbitrary crushing blades corresponding to the crushing of foreign substances such as twigs.

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