JP2012135729A - Automatic strainer for element regeneration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic strainer for element regeneration in which sludge stuck to both of inner and outer circumference surfaces of an element for filtration can be automatically removed while using a strainer when the element for filtration clogs by sludge that easily sticks to inner and outer circumference surfaces of the element for filtration and grows, and which has a simple structure and is inexpensive.SOLUTION: In a strainer body having an inflow port for raw water and an outflow port for clean water, the cylindrical element for filtration is arranged and the raw water is filtered from the inside to the outside or from the outside to the inside of the element. The automatic strainer for element regeneration is characterized in that a scraping mechanism formed of a brush or a scraper for scraping sludge stuck to the inner and outer circumferences of the element is rotated on the inner and outer circumferences of the element via a rotation drive mechanism.

Description

  The present invention relates to a strainer that removes sludge from a liquid containing various foreign matters (hereinafter referred to as sludge), and more specifically, sludge that adheres to the inner and outer peripheral surfaces of a filtering element and easily grows. The present invention relates to an automatic strainer for element regeneration that is removed from both surfaces of a filtering element by a crushing protrusion provided on the inner and outer peripheral surfaces of the filter element and a rotary scraping mechanism provided on the inner and outer periphery of the filtering element.

  As the strainer, a strainer is widely used in which a liquid is passed through a cylindrical filter element and filtered to remove sludge contained in the liquid. When sludge adheres to the filter element during use of the strainer and it becomes clogged, it is necessary to remove the filter element from the strainer body and remove the adhered sludge to eliminate clogging. Since the apparatus using the strainer becomes non-operational, there is a problem in terms of efficiency and economy.

  In order to solve the above-mentioned problem, the scraper such as a scraper is brought into contact with the outer peripheral surface or the inner peripheral surface of the filtering element, and the use of the strainer is interrupted by relatively moving both by a driving motor. In addition, there is also used an automatic cleaning strainer that can scrape and discharge sludge adhering to the filter element.

  However, in plants that handle liquids that contain a large amount of fibrous waste and dust in the liquid, and strainers that are used in cooling water intake piping of thermal power plants that take in seawater containing algae and the like, fibrous sludge is used. Because it passes through the filtration hole of the filtration element and entangles closely with nearby fibers and grows firmly on the inner and outer peripheral surfaces of the filtration element, the conventional self-cleaning strainer effectively scrapes off the attached sludge. I can't.

  Also, in the supercooling ice making device of the ice storage type cooling system, sludge such as ice particles or fine dust in water or low-concentration brine flows into the supercooling production cooler, and the supercooling production cooler freezes or is blocked. Therefore, a strainer is used on the upstream side of the supercooling generation cooler to prevent damage. When the temperature of the water or low-concentration brine flowing from the ice heat storage tank in the supercooling ice making device to the supercooling production cooler is below the freezing point, ice particles trapped on the strainer filtration element grow and are filtered. Clogging occurs by covering the inner and outer peripheral surfaces of the element. In such a case, with the conventional automatic cleaning strainer, when scraping off the ice grown on the surface of the filtering element, the scraping part slides on the surface of the ice, so that the ice can be effectively removed. Can not.

  As a strainer for removing fibrous sludge adhering to the filter element, Patent Document 1 discloses a backwash nozzle that moves along the upstream surface of the filter element disposed in the fluid flow path, and the filter A scraper having a blade member that moves with the backwash nozzle while sliding on the upstream surface of the element is provided, and the sludge that is difficult to be removed is entangled with a nearby fiber through the filtration hole of the filtration element. An automatic backwash strainer is described in which the sludge that has been cut and sandwiched between the sharp blade member and the filter element is sucked and discharged by a backwash nozzle after being entangled with the filter element. Yes.

  On the other hand, as a strainer capable of removing ice adhering to the surface of the filtering element, the patent sentence pattern 2 is provided with a scraper as a pair of scrapers so as to be displaced while sliding on the outer peripheral surface of the filtering element. In addition, there is described a strainer in which a connecting plate that integrally connects both scrapers is connected to a rotating shaft that is driven and rotated by an electric motor to scrape and remove ice adhering to the outer peripheral surface of the filtering element.

  Further, in Patent Document 3, a cleaning brush is installed inside the filtering element, or a cleaning brush is installed inside the filtering element and an ice removing device is installed outside, and the filtering element is rotated by a drive motor and adhered to the filtering element. A strainer is described that removes the icy ice.

Japanese Patent Laid-Open No. 11-257892 Japanese Patent Laid-Open No. 3-199895 JP 2001-153406 A

  In the strainer described in Patent Document 1, since the scraper having the blade member is provided only on the primary side of the filtering element, sludge that grows on the secondary side of the filtering element and causes clogging is generated. It cannot be removed by peeling sufficiently. The backwash nozzle is a mechanism that creates a flow from the secondary side to the primary side of the filter element and flushes the sludge that clogs the filter hole of the filter element. The sludge adhering to the secondary side cannot be washed out sufficiently.

  In addition, since the structure of the backwash nozzle system is provided, the structure is complicated, and in addition, periodic maintenance is essential to maintain the sharpness of the blade member attached to the cutting scraper. A device using the strainer becomes non-operational.

  In the strainer described in Patent Document 2, since the scraper as a scraping portion is provided only on the secondary side of the filtering element, it is possible to scrape and remove the ice adhering to the primary side of the filtering element. Can not. For this reason, when clogging occurs due to ice adhering to the primary side of the filtering element, it is necessary to remove the filtering element from the strainer body and remove the ice adhering to the primary side. A device using a strainer becomes non-operational.

  The strainer described in Patent Document 3 is provided with a backwash pipe and a backwash pump for removing the ice in preparation for the case where the ice adheres to the secondary side of the rotary filtration element and grows. This complicates the structure of the strainer device and increases the price. In addition, when the temperature of water or low-concentration brine is below the freezing point, it is necessary to always keep the strainer in an operating state, which causes a problem that the operating cost increases.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to clog the filter element due to sludge that tends to adhere to the inner and outer peripheral surfaces of the filter element and grow. In this case, it is possible to automatically remove sludge adhering to both the inner and outer peripheral surfaces of the filter element while using the strainer, and to provide an automatic strainer for element regeneration that is simple in structure and inexpensive. is there.

  In order to achieve the above-mentioned object, the invention according to claim 1 is arranged such that a cylindrical filtering element is arranged in a strainer body having an inlet for raw water and an outlet for water purification, and from the inside to the outside of this element. Alternatively, in a strainer that filters raw water from the outside to the inside, a scraping mechanism comprising a brush or a scraper for scraping off sludge adhering to the inner and outer circumferences of the element is provided on the inner and outer circumferential surfaces of the element via a rotary drive mechanism. It is an automatic strainer for element regeneration characterized by being rotated.

  According to a second aspect of the present invention, the rotary drive mechanism of the electric motor or gear manual mechanism mounted on the strainer body is provided with a rotary shaft, and the scraping mechanisms on both the inner and outer circumferences of the element are respectively connected to the rotary shaft. This is an automatic element regeneration strainer with an interlocking rod and both scraping mechanisms rotated simultaneously.

  According to a third aspect of the present invention, the raw water inlet is provided at an eccentric position on the upper side surface of the strainer body, the outlet is disposed at the lower part of the strainer body, the upper part of the filtering element is sealed, and the lower opening is formed in the flow path. This is an automatic strainer for element regeneration in which a raw water space for swirling and a purified water space are provided through a shielding wall arranged on the outer periphery of the lower part of the element, communicated with the outlet, and the purified water filtered in the raw water space is discharged from the outlet.

  The invention according to claim 4 is the automatic strainer for element regeneration in which both the internal and external scraping mechanisms are arranged corresponding to the same positions on the inner and outer circumferences of the element.

  The invention according to claim 5 is an automatic element regeneration device in which crushing protrusions are provided at appropriate positions on both the inner and outer peripheral surfaces of the element, and a notch portion corresponding to the crushing protrusion is provided in the scraping part of the scraping mechanism. It is a strainer.

  The invention according to claim 6 is an automatic strainer for element regeneration in which crushing protrusions are used as crushing blades, and sludge adhering to and growing on the inner and outer periphery of the element at the notch portions of the crushing blades and the scraping mechanism is crushed and removed. .

  The invention according to claim 7 is the element regeneration automatic according to any one of claims 1 to 6, wherein the element is automatically projected on the inner and outer peripheral surfaces of the element in a centripetal direction or a centrifugal direction at predetermined intervals or randomly. It is a strainer.

  According to the first aspect of the present invention, the raw water flowing into the strainer body from the raw water inlet can be filtered from the inside to the outside of the filtering element disposed on the strainer body, or from the outside to the inside. In addition, when clogging occurs due to sludge adhering to the filter element, the scraper mechanism consisting of a brush or scraper is rotated on the inner or outer periphery of the element via the rotary drive mechanism while the strainer is in use. By doing so, sludge adhered and grown on the inner periphery or outer periphery of the element is scraped and removed, and the filtration ability of the filter element can be regenerated. Therefore, it is highly useful as a strainer for use in an apparatus that handles raw water containing ice particles and fibrous sludge, which tends to adhere and grow on the inner and outer peripheries of the filtration element.

  According to the second aspect of the invention, the scraping mechanisms arranged on both the inner periphery and the outer periphery of the filtering element are integrally connected to each other by the interlocking rod, and at the same time on the inner and outer periphery of the filtering element via the rotation drive mechanism. Rotating and scraping ice and fibrous sludge adhering and growing on the inner and outer peripheral surfaces of the filtering element at the same time from the inner and outer peripheral surfaces can efficiently regenerate the filtering ability of the filtering element.

  According to the invention of claim 3, sludge that adheres to the filter element and enters the secondary side from the primary side and easily grows on the entire peripheral surface of the filter element can be obtained while the strainer is still in use. It can be simultaneously scraped and removed from the inner and outer peripheral surfaces via a rotary drive mechanism, and the filtration capacity of the filtration element can be efficiently regenerated, so it can be used in equipment that handles raw water containing ice particles and fibrous sludge. However, the operating rate of the apparatus is not lowered, and the use value as a strainer is extremely large.

  According to the fourth aspect of the present invention, the scraping mechanism is disposed on both the inner and outer peripheries of the filtering element corresponding to the same position on the inner and outer peripheral surfaces, and both the inner and outer scraping mechanisms are disposed on the inner and outer peripheral surfaces of the filtering element. Since the same position is scraped simultaneously from both surfaces, sludge adhering and growing on the inner and outer peripheral surfaces of the filtering element can be effectively scraped and removed from both the inner and outer peripheral surfaces to regenerate the filtering ability of the filtering element.

  According to the invention according to claim 5, the crushing protrusions are generated in the sludge adhered and grown on the inner and outer peripheral surfaces of the filtering element by the crushing protrusions provided on both the inner and outer peripheral surfaces of the filtering element. When the scraping mechanism provided with a notch corresponding to is rotated on the inner and outer peripheries of the filtering element, the scraping force acting on the sludge from the scraping mechanism causes the sludge to break starting from the discontinuous portion. Therefore, even sludge firmly adhered and grown on the inner and outer peripheral surfaces of the filtering element can be easily scraped and removed to regenerate the filtering ability of the filtering element.

  According to the invention which concerns on Claim 6, even if it scrapes off from the surface of the element for filtration by the scraping mechanism which slides on the inner peripheral surface of the element for filtration, it does not sink to the bottom part of a strainer main body, but is attached to the scraping mechanism. Sludge is crushed by the crushing blades provided on the inner and outer peripheries of the filtration element and the cut-out part of the scraping part, and removed from the scraping mechanism to prevent a reduction in the scraping ability of the scraping part. it can.

  According to the seventh aspect of the invention, an appropriate number of crushing protrusions are protruded from the inner and outer peripheral surfaces of the element at predetermined intervals or randomly toward the centripetal direction or the centrifugal direction according to the nature of the sludge contained in the liquid. This effectively generates discontinuities in the sludge that has grown and adhered to the filter element, and crushes and reduces the sludge clinging to the scraping mechanism and removes it from the scraping mechanism. Therefore, sludge that adheres and grows on the inner and outer peripheral surfaces of the filtering element can be efficiently scraped off and the filtering ability of the filtering element can be regenerated.

1 is a vertical cross-sectional view showing an embodiment of an automatic strainer for element regeneration in the present invention. It is a schematic diagram which shows an example of the arrangement | positioning condition of the scraping mechanism arrange | positioned at the inner periphery of the element for filtration. It is a model diagram which shows the relationship between the crushing protrusion provided in the inner peripheral surface of the filtration element, and the notch provided in the scraping mechanism. It is a model drawing explaining the effect of the crushing protrusion provided in the inner peripheral surface of the element for filtration, and the notch provided in the scraping mechanism. It is a schematic diagram which shows an example of the arrangement | positioning condition of the crushing protrusion of the inner peripheral surface of the filtration element. It is a schematic diagram which shows the other example of the arrangement | positioning condition of the crushing protrusion of the inner peripheral surface of the filtration element. It is a vertical cross-sectional view showing another embodiment of the automatic strainer for element regeneration in the present invention.

Hereinafter, embodiments of an automatic strainer for element regeneration in the present invention will be described in detail with reference to the drawings.
FIG. 1 is a vertical sectional view showing an embodiment of an automatic strainer for element regeneration according to the present invention.

  According to FIG. 1, the automatic strainer 1 for element regeneration has a strainer body 2 having a vertical cylindrical shape, a lower portion closed by a bottom plate 3, and an upper opening portion closed by a removable cover plate 4. The raw water inlet 5 is provided at an eccentric position on the upper side surface of the strainer body 2, and the water purification outlet 6 is provided on the bottom plate 3. Further, the cover plate 4 is provided with a vent pipe 7 to a vent valve (not shown), and a drain pipe 9 to the drain valve 8 is provided at the lower part of the strainer body 2.

  An annular partition plate 11 having a circular hole 10 formed in the center is provided on the lower inner surface of the strainer body 2 so as to protrude in the centripetal direction, and an inner diameter equal to the diameter of the circular hole 10 is provided on the upper surface of the partition plate 11. A shielding wall 12 having a short cylindrical shape is provided so as to communicate with the circular hole 10.

  Inside the strainer body 2, a filtering element 13 for removing sludge from raw water and filtering, and a rotary scraping mechanism 14 for removing sludge adhered and grown on the inner and outer peripheral surfaces of the filtering element 13 are arranged.

  The upper portion of the filtering element 13 is closed by a plate 15 and the lower portion is opened. The lower end portion 17 is engaged with the upper portion 16 of the shielding wall 12 and is placed in the strainer body 2. For this reason, the outer peripheral side of the filtering element 13 is the primary side, and the inner peripheral side is the secondary side, and the raw water containing sludge is filtered through the filtering element 13 from the outer peripheral side to the inner peripheral side. In this example, a punching plate is used as the filter screen 18 of the filtering element 13, but it corresponds to sludge contained in raw water, and other appropriate members such as a wedge wire and a wire mesh can be selected and used. .

  The rotary scraping mechanism 14 includes scraping mechanisms 19 a and 19 a disposed on the inner periphery of the filtering element 13, scraping mechanisms 19 b and 19 b disposed on the outer periphery of the filtering element 13, and an inner periphery of the filtering element 13. Connected to the interlocking rod 20a that connects the scraping mechanisms 19a and 19a arranged as a unit, the interlock rod 20b that links the scraping mechanisms 19b and 19b disposed on the outer periphery, and the interlocking rods 20a and 20b. The scraper mechanisms 19a, 19b are a mechanism rotating shaft 21 that allows the inner and outer peripheries of the filtering element 13 to rotate, and an adjustment fitting 22 that adjusts the relative positional relationship between the scraper mechanisms 19a, 19b disposed on the inner and outer peripheries. It consists of and.

  The lower portion 23 of the mechanism rotating shaft 21 is rotatably supported by a bearing 25 of a support member 24 disposed on the upper portion of the shielding wall 12 on the lower inner surface of the strainer body 2. For this reason, the scraping mechanisms 19 a and 19 b of the rotary scraping mechanism 14 can freely rotate on the inner and outer peripheries of the filtering element 13.

  A scraping portion 28 is attached to the scraping mechanisms 19a and 19b in order to scrape off sludge adhering to the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13. As the scraping part 28, a brush or a scraper can be used. The configuration of the scraping portion 28 attached to the scraping mechanisms 19a and 19b may be the same for both the inner and outer periphery with a brush or a scraper. For example, the outer periphery may be a brush and the inner periphery may be a scraper. Furthermore, a brush and a scraper can be used in combination as appropriate at random according to the type and amount of sludge contained in the raw water.

  As shown in FIGS. 1 and 2, when the inner and outer scraping mechanisms 19a and 19b are arranged so as to correspond to the same position so that the same inner and outer positions of the filtering element 13 are simultaneously scraped from both surfaces, the filtering element Since the scraping force from the scraping members 28 on both the inner and outer periphery acts simultaneously on the sludge adhered and grown on the inner and outer peripheral surfaces 26 and 27, the sludge is strongly scraped off by the resultant force of the scraping forces from both the inner and outer sides. Even ice or fibrous sludge that adheres to and grows on the inner and outer peripheral surfaces of the filter element 13 that is difficult to cope with with the conventional automatic cleaning strainer can be effectively scraped and removed.

  A rotation drive mechanism 29 is mounted on the upper surface of the lid plate 4 that closes the upper portion of the strainer body 2. The rotation shaft 30 of the rotation drive mechanism 29 is connected to the outer peripheral interlocking rod 20b of the rotation scraping mechanism 14 via a downward U-shaped metal fitting 31 provided at the lower portion, and the rotation of the rotation shaft 30 is rotated by the rotation scraping mechanism. 14 is rotated to rotate the rotary scraping mechanism 14. In this example, the electric motor 32 is used as means for driving the rotational drive mechanism 29, but it can also be driven using a manual gear mechanism.

Next, the operation of the embodiment will be described.
The raw water containing sludge flowing into the element regeneration automatic strainer 1 from the raw water inlet 5 is provided in the strainer body 2 with the raw water inlet 5 being eccentric as shown in FIG. It is guided by the inner surface to form a swirling flow, and swirls in the raw water space 33 on the outer periphery of the filtering element 13.

  Further, the raw water flowing as a swirling flow around the outer periphery of the filtering element 13 cleans the outer peripheral surface 27 of the filtering element 13, thereby making it difficult for sludge to adhere to the outer peripheral surface 27 and hindering the growth of the attached sludge. .

  The raw water in the raw water space 33 is filtered by passing through the filtering element 13 from the outer peripheral surface 27 side to the inner peripheral surface 26 side, and becomes purified water. The purified water in the purified water space 34 on the inner peripheral side of the filtering element 13 flows out of the automatic strainer 1 for element regeneration from the purified water outlet 6 provided in the lower part of the strainer body 2.

  Since the outer peripheral surface 27 of the filtering element 13 is always washed by the swirling flow of the raw water, it is difficult for the sludge to adhere to the outer peripheral surface 27 and grow. It cannot be prevented. In particular, when the sludge contained in the raw water is fibrous, it is not possible to completely prevent the sludge from entering into the filtration holes 35 of the filtration element 13 and entangled with each other. In addition, even when the raw water is water or low-concentration brine and the temperature of the raw water is below the freezing point and is in a supercooled state, the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 are frozen and the frozen state grows. It cannot be prevented.

  When the sludge contained in the raw water adheres and grows on the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 and the filtering capacity of the filtering element 13 decreases, the pressures installed at the raw water inlet 5 and the purified water outlet 6 respectively. When the differential pressure of the meter (not shown) becomes large, for example, 0.06 MPa, the filtering element 13 needs to be cleaned.

In order to perform the cleaning for removing the sludge adhered and grown on the filtering element 13, a switch (not shown) of the electric motor 32 is turned on, the rotation drive mechanism 29 is operated, and the scraping disposed on the inner and outer peripheries of the filtering element 13 is performed. The mechanisms 19a and 19b are simultaneously rotated to scrape off sludge adhering and growing on the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13.
At this time, since the scraping portion 28 scrapes the same position of the filtration element 13 from the inner and outer periphery at the same time, even if the sludge is attached to the filtration element 13 and grows through the filtration hole 35, Since the scraping force from the scraping portion 28 acts simultaneously from the inner and outer circumferences, and the resultant force becomes a large scraping force, the scraping can be effectively removed.

  The sludge scraped and removed from the outer peripheral surface 27 of the filtering element 13 settles in the lower portion of the raw water space 33. Therefore, when the drain valve 8 is opened, the sludge separated from the raw water by the swirl effect and precipitated It can be discharged to the outside of the automatic strainer 1 for element regeneration through the pipe 9.

  When the differential pressure between the raw water inlet 5 and the purified water outlet 6 becomes a specified value or less, the sludge adhered to the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13 is removed, and the filtering element 13 is removed. Since it can be determined that the filtering capacity has been recovered, the switch of the electric motor 32 is turned off, and the cleaning operation of the filtering element 13 is completed.

  If the differential pressure does not fall below the specified value even after performing the above operation several times, the filtering element 13 is taken out from the strainer body 2 and cleaned appropriately.

  Next, the crushing protrusions provided on the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13 and the notch portions provided in the scraping portions 28 of the scraping mechanisms 19a and 19b, which are other features of the present invention. The configuration and operation will be described in detail.

  Scraping mechanisms 19a and 19b are disposed on the inner and outer peripheries of the filtering element 13 even if the sludge adheres to and grows on the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 which is difficult to cope with with a conventional strainer. By arranging the scraping mechanisms 19a and 19b on both the inner and outer periphery corresponding to the same position and providing the rotary scraping mechanism 14 that rotates both the inner and outer scraping mechanisms simultaneously, the sludge is effectively scraped and removed. The filtration capacity of the filtration element can be regenerated. Furthermore, in combination with the rotary scraping mechanism 14, the inner and outer peripheral surfaces 26, 27 of the filtering element 13 can be strengthened by using the filtering element 13 provided with the crushing protrusions 36 on the inner peripheral surface 26 and the outer peripheral surface 27. Even sludge that has adhered and grown can be easily scraped and removed.

  As shown in FIG. 1, crushing protrusions 36 project from the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13 in the centripetal direction or the centrifugal direction. In the case of the present embodiment, the filtering element 13 is manufactured from punching metal, and the crushing protrusions 36 are welded to the inner and outer peripheral surfaces 26 and 27 of the punching metal.

  According to FIG. 3, since the crushing protrusions 36 are provided on the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13, the scraping parts 28 attached to the scraping mechanisms 19a and 19b include crushing protrusions. In order to avoid interference with 36, a notch 37 corresponding to the crushing protrusion 36 is provided. The scraping part 28 (brush in this figure) attached to the scraping mechanisms 19a and 19b has an inner peripheral surface of the filtering element 13 without interfering with the crushing protrusion 36 due to the presence of the notch part 37. 26 and the outer peripheral surface 27 can be slid and the sludge 38 adhered and grown on the inner and outer peripheral surfaces can be scraped off.

Since the crushing protrusions 36 are provided on the inner and outer peripheral surfaces 26 and 27 of the filtering element 13, even if sludge adheres to the inner and outer peripheral surfaces 26 and 27 of the filtering element 13, the crushing protrusions 36 are not formed. Since sludge cannot adhere and grow on the protruding portion, a sludge discontinuity occurs in this portion. For this reason, when the scraping portion 28 scrapes the sludge from the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 simultaneously, the sludge is pulled in the moving direction of the scraping portion 28 by the resultant force of the scraping force from both surfaces. In this case, the fracture starting from the discontinuity occurs.
Even if the sludge firmly adheres to and grows on the inner and outer peripheral surfaces 26 and 27 of the filtering element 13, the filtering element 13 provided with the crushing protrusions 36 on the inner and outer peripheral surfaces 26 and 27 is combined with the rotary scraping mechanism 14. By using it, it can be easily scraped off and the filtration capacity of the filtration element 13 can be reliably regenerated.

  As shown in FIG. 4, even if the scraping mechanisms 19a and 19b are scraped and removed from the inner peripheral surface 26 and the outer peripheral surface 27 of the filter element 13, they do not settle on the lower portion of the strainer body 2, and the sludge 38 is fused. As a result, the scraping mechanism 28 is attached to the scraping portion 28 and moves on the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13 as the scraping mechanisms 19a and 19b rotate. In this way, when the sludge 38 is fused to the scraping portion 28 and attached, the scraping ability of the scraping portion 28 is greatly reduced. Therefore, it is necessary to remove the sludge 38 from the scraping portion 28.

  In the present invention, the crushing protrusion 36 is a rectangular plate-shaped crushing blade 40 in order to remove the sludge 38 attached to the scraping portion 28. As shown in FIG. 4, after the scraping and removal, the fused sludge is fused and attached to the scraping portion 28 and moves on the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 together with the scraping mechanisms 19 a and 19 b. When 38 passes through the portion where the crushing blade 40 protrudes as the crushing projection 36, the portion 41 of the sludge 38 protruding from the cutout portion 37 of the scraping portion 28 is blocked by the crushing blade 40. On the other hand, the portion 42 of the sludge 38 attached to the scraping portion 28 continues to move together with the scraping mechanisms 19a and 19b. As a result, a tensile force is generated between the portion 41 blocked by the crushing blade 40 of the sludge 38 and the portion 42 attached to the scraping portion 28 of the sludge 38, and finally the sludge 38 is cut. Destroyed. For this reason, the portion 41 of the sludge 38 that has been unfastened to the scraping portion 28 is deposited at the lower portion of the strainer body 2. Further, the portion 42 of the sludge 38 that has moved together with the scraping member 28 is also easily separated from the scraping portion 28 by the pulling force when the sludge 38 is cut, and the separated portion is the lower part of the strainer body 2. To settle.

  Due to the above action, the scraping ability of the scraping portion 28 is restored, and the sludge 38 that adheres and grows on the inner peripheral surface 26 and the outer peripheral surface 27 of the filtering element 13 can be continuously scraped and removed. .

The crushing blades 40 project from the inner and outer peripheral surfaces 26 and 27 of the filtering element 13 in the centripetal direction or the centrifugal direction. The arrangement method is aligned in a line as illustrated in FIG. You may arrange | position and may arrange | position in zigzag form so that it may illustrate in FIG. Further, the interval at which the crushing blades 40 are projected may be constant or random.
As the number of the crushing blades 40 protruding increases, the number of discontinuous portions 39 generated in the sludge 38 that has adhered to and grown on the inner and outer peripheral surfaces 26 and 27 of the filtering element increases, and it becomes easier to scrape and remove. The effect of breaking and downsizing the sludge 38 attached to the scraping portion 28 and reducing the sludge 38 from the scraping portion 28 is increased. Since 40 becomes resistance and diminishes the swirling flow effect, it is necessary to stop at an appropriate number according to the nature of the sludge contained in the raw water.

  Next, another embodiment of the present invention will be described. In other embodiments, only parts different from the above-described embodiment will be described. In addition, about the number which shows a common structure and components, the same number as the said embodiment is used.

  According to FIG. 7, the automatic strainer 101 for element regeneration of another embodiment is a strainer of a system that filters raw water from the inner peripheral side to the outer peripheral side of the filtering element, unlike the embodiment of FIG.

  According to FIG. 7, in the automatic strainer 101 for element regeneration, the strainer body 102 has a vertical cylindrical shape, the lower part is closed by the bottom plate 3, and the upper opening is closed by the removable cover plate 4. A raw water inlet 105 is provided above the side surface of the strainer body 102, and a water purification outlet 106 is provided in the middle of the side surface. Further, a vent pipe 7 to a vent valve (not shown) is provided on the lid plate 4, and a drain pipe 109 to the drain valve 8 is provided on the bottom plate 3 of the strainer body 102.

  Further, an annular filter element mounting plate 111 having a circular hole 110 formed in the center is provided on the inner inner surface of the strainer body 102 so as to protrude in the centripetal direction. In addition, a support member 125 for the central rotating shaft 121 is provided on the lower inner surface of the strainer body 102.

  The upper end portion of the filtering element 113 is opened, and the lower end portion is closed by a plate 115. For this reason, the filtering element 113 is filtered through the filtering element 113 from the inner peripheral side to the outer peripheral side, and the raw water is filtered from the inner peripheral side to the outer peripheral side.

  The filtering element 113 is inserted into the circular hole 110 of the filtering element mounting plate 111, and the upper end mounting portion 116 of the filtering element 113 and the filtering element mounting plate 111 are fixed by an appropriate method so that the inside of the strainer body 102 Is arranged.

  Further, scraping mechanisms 19a and 19b are arranged on both the inner and outer peripheries of the filtering element 113, and the configuration of the other rotary scraping mechanisms 114 is substantially the same as that of the embodiment of FIG. 1, but on the outer peripheral side of the filtering element 113. An interlocking rod 20b for connecting the arranged scraping mechanisms 19b, 19b is arranged below the filtering element 113.

  The configuration of the rotary drive mechanism 29 that drives the rotary scraping mechanism 114 is substantially the same as that of the embodiment of FIG. 1, but the downward U-shaped metal fitting 31 provided at the lower part of the rotary shaft 30 and the central rotary shaft 121. The rotating shaft 30 is connected to the rotary scraping mechanism 114 via a connecting rod 133 provided at the upper end of the rotary scraper, and the rotary scraping mechanism 114 is rotated.

Next, the operation of the above embodiment will be described.
In the embodiment of FIG. 7, raw water containing sludge that flows into the element regeneration automatic strainer 101 from the raw water inlet 105 is filtered by passing through the filtering element 113 from the inner peripheral side to the outer peripheral side to become purified water. . The purified water in the purified water space 34 on the outer peripheral side of the filtering element 113 flows out of the automatic strainer 101 for element regeneration from the purified water outlet 106 provided on the middle side surface of the strainer body 102.

  The increase in the differential pressure between the raw water inlet 105 and the purified water outlet 106 is indicated by the fact that sludge contained in the raw water adheres and grows on the inner and outer peripheral surfaces 26 and 27 of the filter element 113 and the filtration capacity decreases. (Not shown), it is possible to scrape and remove sludge adhered and grown on the inner and outer peripheral surfaces 26 and 27 of the filtering element 113 by performing the same operation as in the embodiment of FIG. it can

  The sludge scraped and removed from the inner peripheral surface 26 (primary side) of the filter element 113 settles on the lower part of the strainer main body 102. Can be discharged.

  As is apparent from the above description, in the strainer according to the present invention, sludge that easily adheres to and grows on the filter element, such as fibrous dust, dust, and ice, which has been difficult to handle with the conventional automatic cleaning strainer, is filtered. Even if it grows and adheres to the inner and outer peripheral surfaces of the filter element, sludge that adheres and grows on the inner and outer peripheral surfaces of the filter element is removed while the strainer is operating without stopping the supply of raw water. Since it can be discharged to the outside, not only can the labor and efficiency of the filtration element maintenance work be improved, but also the operating rate and productivity of the entire device using the strainer can be significantly improved. The economic value is extremely large.

DESCRIPTION OF SYMBOLS 1,101 Automatic strainer for element regeneration 2,102 Strainer main body 3 Lid body 5,105 Raw water inlet 6,106 Clean water outlet 13,113 Filtration element 14 Rotary scraping mechanism 19a, 19b Scraping mechanism 20a, 20b Interlocking rod 28 Scraping part (brush or scraper)
29 Rotation Drive Mechanism 36 Crushing Projection 37 Notch 38 Sludge

Claims (7)

  In the strainer main body having a raw water inlet and a purified water outlet, a cylindrical filter element is disposed, and the strainer filters raw water from the inside to the outside of the element or from the outside to the inside. An automatic strainer for element regeneration, wherein a scraping mechanism comprising a brush or a scraper for scraping off sludge adhering to the inner and outer circumferences of an element is rotated on the inner and outer circumferential surfaces of the element via a rotary drive mechanism.   A rotation shaft is provided in the rotation drive mechanism of the electric motor or gear manual mechanism mounted on the strainer body, and an interlocking rod connected to the rotation shaft is provided in each of the scraping mechanisms on both the inner and outer circumferences of the element. The automatic strainer for element regeneration according to claim 1, wherein the take-up mechanism is rotated simultaneously.   The raw water inlet is provided at an eccentric position on the upper side surface of the strainer body, the outlet is disposed at the lower part of the strainer body, the upper part of the element is sealed, and the lower opening is communicated with the outlet. The automatic strainer for element regeneration according to claim 1 or 2, wherein a raw water space for swirling and a purified water space are provided via a shielding wall disposed on the outer periphery of the lower part, and the purified water filtered in the raw water space is discharged from the outlet. .   The automatic strainer for element regeneration according to any one of claims 1 to 3, wherein both the internal and external scraping mechanisms are arranged corresponding to the same positions on the inner and outer circumferences of the element.   The crushing protrusion is provided at an appropriate position on both the inner and outer peripheral surfaces of the element, and a notch corresponding to the crushing protrusion is provided in the scraping part of the scraping mechanism. Automatic strainer for element regeneration as described in 1.   The element according to any one of claims 1 to 5, wherein the crushing protrusion is a crushing blade, and sludge adhering and growing on the inner and outer circumferences of the element is crushed and removed by a cutout portion of the crushing blade and a scraping mechanism. Automatic strainer for regeneration.   The automatic strainer for element regeneration according to any one of claims 1 to 6, wherein the crushing protrusions are protruded from the inner and outer peripheral surfaces of the element in a centripetal direction or a centrifugal direction at predetermined intervals or randomly.

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