JP6213355B2 - Filter cleaning head - Google Patents

Description

  The present invention is provided in a cylindrical filter which is disposed in a casing and filters the water to be treated which flows into the casing and flows out to the outside, and slidably contacts the inner surface of the filter to suck backwash water. The present invention relates to a filter cleaning head.

  As a filter for filtering water to be treated such as ballast water stored in a ship and contaminated water containing other pollutants, a cylindrical filter is provided that filters the water to be treated flowing into the interior and flows it out. There is a filter. The filter used in this filter is provided with a filter body, such as a wire mesh, in a cylindrical shape on the inner peripheral surface of a support formed by connecting a thin metal plate having a large number of holes with the sides thereof butted together. Those of different configurations are known.

  In the filter configured as described above, one opening serves as a treated water inlet, the other opening is closed, and the treated water flowing into the filter from the treated water inlet passes through the filter on the inner peripheral surface. Since foreign matter accumulates on the inner surface of the filter and the amount of foreign matter increases, the clogging of the filter proceeds. If left as it is, the pressure loss increases and the filtration flow rate is sufficient. Can not be obtained. In order to prevent such a situation, it is necessary to clean the filter to remove foreign matter accumulated on the inner surface and maintain the filter's filtering ability.

As a method for cleaning the filter, reverse cleaning is known in which treated water on the secondary side of the filter flows in the direction opposite to the filtration direction. The water in which the filtrate is mixed by the reverse cleaning is provided in the filter, slidably contacts the inner surface of the filter, and is sucked and discharged from a filter cleaning head that slides on the inner surface of the filter (see, for example, Patent Document 1). ).
This type of filter cleaning head exemplified in Patent Document 1 is connected to a cleaning sewage discharge pipe disposed in the filter, and includes a nozzle that slidably contacts the inner surface of the filter. Is provided with a suction hole, so that backwash water is sucked from the suction hole due to the pressure difference between the secondary pressure of the filter and the washing sewage discharge pipe, and is discharged through the washing sewage discharge pipe.

Special table 2008-507391

The cylindrical filter described above has a structure in which a filtering body such as a wire mesh is provided in a cylindrical shape on the inner peripheral surface of a support formed in a cylindrical shape by connecting the sides of a thin metal plate provided with a large number of holes. In some cases, there will be one or more cascades in the filter.
For this reason, the contact surface of the nozzle in this type of filter cleaning head exemplified in Patent Document 1 always passes through the vertical seam in the process of sliding the filter inner surface, and the contact surface of the nozzle straddles the vertical seam. Sometimes the suction hole provided in the contact surface of the nozzle is momentarily blocked by the longitudinal joint of the filter, and the suction of the backwash water is stopped. As a result, a water hammer effect occurs due to the propagation of pressure waves caused by a rapid pressure change in the cleaning sewage discharge pipe due to a rapid decrease in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe. It may be damaged.
In addition, a negative pressure wave generated when the pressure of the cleaning sewage discharge pipe suddenly changes due to a sudden decrease in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe propagates to the drainage side, and the reflected wave becomes a positive pressure wave. In some cases, water is ejected from the suction hole of the nozzle, and the abutting surface of the nozzle is separated from the inner surface of the filter by this ejection pressure. In this case, if the pressure on the primary side of the filter is applied to the contact surface of the nozzle and the force that presses the contact surface of the nozzle against the filter is small, the nozzle contact surface also passes through the longitudinal seam of the filter. The contact surface may remain separated from the filter inner surface. In order to prevent such separation of the nozzle contact surface from the filter inner surface, the nozzle contact surface must be pressed against the filter with a large force that exceeds the injection pressure for injecting water from the nozzle suction hole generated by a positive pressure wave. Therefore, the composition becomes large.

  The object of the present invention is to allow the backwash water to be sucked by the suction holes provided in the contact surface even when the contact surface of the nozzle straddles the longitudinal joint of the inner surface of the filter, and the cleaning wastewater flowing through the cleaning wastewater discharge pipe It is an object of the present invention to provide a filter cleaning head in which the change in the amount of water can be reduced and the water hammer effect can be reduced.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided in a cylindrical filter which is disposed in a casing and filters the water to be treated which flows into the casing and flows out to the outside. A filter cleaning head that slidably contacts the inner surface and sucks backwash water, a head base tube having a rear end connected to a cleaning sewage discharge pipe disposed in the filter, and a front end side of the head base tube A suction hole is provided in the contact surface of the nozzle, and when the contact surface of the nozzle straddles the longitudinal seam of the filter The filter cleaning head is characterized in that a part of the suction hole is formed so as to be exposed outside the longitudinal joint of the filter.

  According to the first aspect of the present invention, the suction hole provided in the contact surface of the nozzle has a part of the suction hole when the contact surface of the nozzle straddles the longitudinal joint of the filter. Since it is formed so as to be exposed outside the vertical seam of the filter, even when the contact surface of the nozzle straddles the vertical seam of the filter, backwash water is sucked from the suction hole and washed as sewage Since it flows through the discharge pipe, a change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe can be reduced, and the water hammer effect can be reduced.

  According to a second aspect of the present invention, the suction hole is formed to be narrower than the vertical joint width of the filter, and a plurality of suction holes are provided on the contact surface of the nozzle, and one suction hole is provided in the vertical joint of the filter. 2. The filter cleaning head according to claim 1, wherein the other suction hole is disposed outside the longitudinal seam of the filter.

  According to the second aspect of the present invention, when one suction hole is in the longitudinal seam of the filter, the other suction hole is disposed outside the longitudinal seam of the filter. Even when the filter is blocked by the longitudinal seam, backwash water is sucked from the other suction holes and flows through the cleaning sewage discharge pipe, so that the change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe can be reduced. The impact action can be mitigated. Since the suction hole is formed to be narrower than the vertical joint width of the filter, even when the plurality of suction holes provided in the contact surface of the nozzle are separated from the vertical joint of the filter and are fully opened. The amount of backwash water sucked from all the suction holes can be suppressed to an appropriate amount, and excessive discharge of the wash water used as backwash water can be prevented.

  According to a third aspect of the present invention, the suction hole is formed to be narrower than the vertical seam width of the filter and longer than the vertical seam width of the filter, and the contact surface of the nozzle is the vertical seam of the filter. 2. The filter cleaning head according to claim 1, wherein an inclined upper part and an inclined lower part of the suction hole are provided so as to be exposed outside a longitudinal joint of the filter when straddling the filter. .

  According to a third aspect of the present invention, when the abutment surface of the nozzle straddles the vertical joint of the filter, the inclined upper portion and the inclined lower portion of the suction hole are exposed outside the vertical joint of the filter. Since it is provided with an inclination, even when the contact surface of the nozzle straddles the longitudinal seam of the filter, the backwash water is sucked from the suction hole and flows through the cleaning wastewater discharge pipe as cleaning wastewater. A change in the amount of cleaning sewage flowing through the sewage discharge pipe can be reduced, and the water hammer effect can be mitigated. Since the suction hole is formed to be narrower than the vertical joint width of the filter, even if the suction hole provided in the contact surface of the nozzle is removed from the vertical joint of the filter and is fully opened, suction is performed. The amount of backwash water sucked from the hole can be suppressed to an appropriate amount, and excessive discharge of the wash water used as backwash water can be prevented.

  A fourth aspect of the present invention is the filter cleaning head according to the first aspect, wherein the suction hole is formed wider than a vertical joint width of the filter.

  According to the invention described in claim 4, since the suction hole is formed wider than the vertical joint width of the filter, when the contact surface of the nozzle straddles the vertical joint of the filter, the suction hole is formed. A part of the hole is exposed outside the longitudinal joint of the filter, and backwash water is sucked from the exposed part of the suction hole and flows through the cleaning wastewater discharge pipe as cleaning wastewater. Even when the longitudinal seam of the filter is straddled, a change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe can be reduced, and the water hammer effect can be reduced.

  According to the filter cleaning head of the present invention, the suction hole provided in the contact surface of the nozzle is formed such that a part of the suction hole is exposed outside the vertical joint of the filter when straddling the vertical joint of the filter. As a result, even when the suction hole straddles the longitudinal joint of the filter, backwash water is sucked from the suction hole and flows through the cleaning sewage discharge pipe as cleaning sewage. The change can be reduced, the water hammer action can be mitigated, the impact sound due to the water hammer action can be suppressed and the piping can be prevented from being damaged. It is possible to prevent such a situation that the abutting surface is separated from the inner surface of the filter.

It is a schematic sectional drawing which shows an example of the filter provided with the filter cleaning head which concerns on this invention. It is a partially-omission perspective view which shows an example of the filter of a filter. It is sectional drawing which shows the 1st example of embodiment of the filter cleaning head which concerns on this invention. It is explanatory drawing which shows the suction hole provided in the contact surface of the nozzle of a 1st example. It is explanatory drawing which shows the suction hole provided in the contact surface of the nozzle of the 2nd example of embodiment of the filter cleaning head which concerns on this invention. It is explanatory drawing which shows the suction hole provided in the contact surface of the nozzle of the 3rd example of embodiment of the filter cleaning head which concerns on this invention.

Hereinafter, an example of an embodiment of a filter cleaning head according to the present invention will be described in detail with reference to the drawings.
1 is a schematic sectional view showing an example of a filter equipped with a filter cleaning head according to the present invention, FIG. 2 is a partially omitted perspective view showing an example of a filter of the filter, and FIG. 3 is a filter cleaning head according to the present invention. Sectional drawing which shows the 1st example of this embodiment, FIG. 4 is explanatory drawing which shows the suction hole provided in the contact surface of the nozzle of 1st example.

A filter cleaning head 1 according to the present invention is provided in a filter 4 disposed in a casing 3 of a filter 2. The casing 3 is formed in a cylindrical shape, and an upper opening is sealed with a lid 5 and a lower opening is sealed with a bottom 6. In this example, the filter 4 disposed in the casing 3 is an inner peripheral surface of a support body in which a thin metal plate provided with a large number of holes is connected by abutting the sides thereof and formed into a cylindrical shape. A filter body such as a wire mesh is provided in a cylindrical shape (see FIG. 2), and its upper opening is sealed by the upper closing part 8, and the lower opening is sealed by the lower closing part 9, The shaft 3 is rotatably supported by the casing 3 and is rotated by a motor 10.
A treated water inlet 11 that communicates with the filter 4 is provided at the lower portion of the casing 3, and a treated water outlet 12 is provided at the side of the casing 3. Further, in the filter 4, a cleaning sewage discharge pipe 13 that discharges cleaning sewage to the outside is disposed at the shaft center of the filter 4.

The filter cleaning head 1 provided in the filter 4 is attached in communication with the cleaning sewage discharge pipe 13, and has a head base pipe 14 connected to the cleaning sewage discharge pipe 13, and a front end side of the head base pipe 14. And a nozzle 15 that is slidably in contact with the inner peripheral surface of the filter 4.
The nozzle 15 is fitted to the outer periphery on the tip side of the head base tube 14 so as to be movable in the axial direction, and the moving distance is restricted by the support frame 16 provided on the outer periphery of the head base tube 14 and is prevented from coming off. A spring 17 is interposed between the rear end of the nozzle 15 and the support frame 16 to urge the nozzle 15 toward the tip side and press it against the inner peripheral surface of the filter 4. An O-ring 18 that seals between the nozzle 15 and the head base tube 14 is attached between the nozzle 15 and the head base tube 14.

A suction hole 19 communicating with the inside of the head base tube 14 is provided on the contact surface 15 a of the nozzle 15 that contacts the inner peripheral surface of the filter 4. The suction hole 19 is formed such that a part of the suction hole 19 is exposed outside the vertical seam 7 of the filter 4 when the contact surface 15 a of the nozzle 15 straddles the vertical seam 7 of the filter 4.
In the first example, the width W1 of the suction hole 19 provided in the contact surface 15a of the nozzle 15 is formed to be narrower than the width W2 of the vertical joint 7 of the filter 4, and a plurality of the widths W1 are formed on the contact surface 15a of the nozzle 15. Is provided.
In this example, two suction holes 19 (A) and 19 (B) are provided in parallel. The two suction holes 19 (A) and 19 (B) are arranged so that when one suction hole 19 (A) is in the longitudinal joint 7 of the filter 4, the other suction hole 19 (B) is a longitudinal joint of the filter 4. 7 so as to be located outside (see FIG. 4).

  According to the filter cleaning head 1 of the first example configured as described above, the contact surface 15a of the nozzle 15 scans the inner surface of the filter 4 by the rotation of the filter 4, and in the process, the contact surface 15a of the nozzle 15 Even when one suction hole 19 (A) is straddled by the vertical seam 7 of the filter 4 across the vertical seam 7 of the filter 4, the other suction hole 19 (B) is exposed outside the vertical seam of the filter ( (See FIG. 4.) As a result, the backwash water is sucked from the other suction holes 19 (B) exposed outside the vertical joint 7 of the filter 4 and flows through the washing wastewater discharge pipe 13 as washing wastewater. The change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe 13 when straddling the four vertical joints 7 can be reduced, and the water hammer effect caused by the change in the amount of cleaning sewage can be reduced.

  Further, since the width W1 of the suction holes 19 (A) and 19 (B) is formed narrower than the width W2 of the longitudinal seam 7 of the filter 4, all of them provided on the contact surface 15a of the nozzle 15 are provided. Even when the suction holes 19 (A) and 19 (B) are separated from the longitudinal joint 7 of the filter 4 and are fully opened, the suction amount of the backwash water sucked from all the suction holes 19 (A) and 19 (B) is reduced. It can be suppressed to an appropriate amount, and excessive discharge of washing water used as backwash water can be prevented.

FIG. 5 is an explanatory view showing suction holes provided on the contact surface of the nozzle of the second example of the embodiment of the filter cleaning head according to the present invention.
Regarding the filter cleaning head of the second example, the same components as those of the first example will be described with the same reference numerals.

In the filter cleaning head 1 of the second example, the width W3 of the suction hole 20 provided in the contact surface 15a of the nozzle 15 is narrower than the width W2 of the vertical seam 7 of the filter 4 and the vertical seam 7 of the filter 4 When the contact surface 15a of the nozzle 15 straddles the vertical seam 7 of the filter 4 and is formed to be longer than the width W2, the inclined upper part 20a and the inclined lower part 20b of the suction hole 20 are exposed outside the vertical seam 7 of the filter 4. It is provided so as to be inclined (see FIG. 5).
Since the other configuration is the same as that of the first example, the description of the first example is cited.

  According to the filter cleaning head 1 of the second example configured in this way, the contact surface 15a of the nozzle 15 scans the inner surface of the filter 4 by the rotation of the filter 4, and in the process, the contact surface 15a of the nozzle 15 When straddling the vertical seam 7 of the filter 4, the inclined upper part 20a and the inclined lower part 20b of the suction hole 20 are exposed outside the vertical seam 7 of the filter 4 (see FIG. 5). As a result, the backwash water is sucked from the inclined upper portion 20a and the inclined lower portion 20b of the suction hole 20 exposed outside the vertical joint 7 of the filter 4 and flows through the cleaning wastewater discharge pipe 13 as cleaning wastewater. It is possible to reduce the change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe 13 when 15a straddles the vertical joint 7 of the filter 4, and to reduce the water hammer effect caused by the change in the amount of cleaning sewage. it can.

  Further, the width W3 of the suction hole 20 is narrower than the width W2 of the longitudinal seam 7 of the filter 4, so that the suction hole 20 provided in the contact surface 15a of the nozzle 15 is the longitudinal seam of the filter 4. Even when it is removed from 7 and fully opened, the suction amount of the backwash water sucked from the suction hole 20 can be suppressed to an appropriate amount, and excessive discharge of the wash water used as the backwash water can be prevented.

FIG. 6 is an explanatory view showing suction holes provided in the contact surface of the nozzle of the third example of the embodiment of the filter cleaning head according to the present invention.
Regarding the filter cleaning head of the third example, the same components as those of the first example will be described with the same reference numerals.

  In the filter cleaning head 1 of the third example, the width W4 of the suction hole 21 provided in the contact surface 15a of the nozzle 15 is formed wider than the width W2 of the longitudinal seam 7 of the filter 4 (see FIG. 6). ).

  According to the filter cleaning head 1 of the first example configured as described above, the contact surface 15a of the nozzle 15 scans the inner surface of the filter 4 by the rotation of the filter 4, and in the process, the contact surface 15a of the nozzle 15 When straddling the longitudinal seam 7 of the filter 4, a part of the suction hole 21 provided in the contact surface 15a of the nozzle 15 is exposed outside the longitudinal seam 7 of the filter 4 (see FIG. 6). As a result, the backwash water is sucked from a part of the suction hole 21 exposed outside the vertical joint 7 of the filter 4 and flows through the cleaning wastewater discharge pipe 13 as cleaning wastewater. A change in the amount of cleaning sewage flowing through the cleaning sewage discharge pipe 13 when straddling the longitudinal seam 7 can be reduced, and a water hammer effect caused by a change in the amount of cleaning sewage can be reduced.

  In the first and third examples, the widths W1 and W3 of the suction holes 19 and 20 provided in the contact surface 15a of the nozzle 15 are narrower than the width W2 of the longitudinal seam 7 of the filter 4. However, the widths W1 and W3 of the suction holes 19 and 20 may be substantially the same as the width W2 of the vertical seam 7 of the filter 4 or wider than the width W2 of the vertical seam 7 of the filter 4.

  In the first to third examples, the filter 4 is configured to rotate, and the contact surface 15a of the nozzle 15 of the filter cleaning head 1 attached to the cleaning sewage discharge pipe 13 disposed in the filter 4. Is configured to scan the inner surface of the filter 4 by the rotation of the filter 4, but the present invention is also applied to the case where the filter 4 is fixed and the cleaning wastewater discharge pipe 13 is configured to rotate. Can do.

DESCRIPTION OF SYMBOLS 1 Filter washing head 2 Filter 3 Casing 4 Filter 5 Cover part 6 Bottom part 7 Vertical joint 8 Upper closing part 9 Lower closing part 10 Motor 11 To-be-processed water inlet 12 Treated water outflow port 13 Washing sewage discharge pipe 14 Head base pipe 15 Nozzle 15a Contact surface 16 Support frame 17 Spring 18 O-ring 19, 20, 21 Suction hole 21a Inclined upper part 21b Inclined lower part

Claims (4)

A filter cleaning head that is disposed in a casing and is provided in a cylindrical filter that filters the water to be treated that has flowed into the filter and discharges it to the outside, and that slidably contacts the filter inner surface to suck backwash water. Because
A head base tube connected at a rear end to a cleaning sewage discharge pipe disposed in the filter; and a nozzle provided on a front end side of the head base pipe and in contact with the inner surface of the filter; A suction hole is provided, and the suction hole is formed so that a part of the suction hole is exposed outside the vertical joint of the filter when the contact surface of the nozzle straddles the vertical joint of the filter. A filter cleaning head characterized by that.   The suction hole is formed narrower than the vertical joint width of the filter, and a plurality of suction holes are provided on the contact surface of the nozzle. When one suction hole is in the vertical joint of the filter, the other suction hole is a filter. The filter cleaning head according to claim 1, wherein the filter cleaning head is disposed outside the longitudinal seam of the filter.   The suction hole is formed to be narrower than the vertical seam width of the filter and longer than the vertical seam width of the filter, and when the contact surface of the nozzle straddles the vertical seam of the filter, the suction hole The filter cleaning head according to claim 1, wherein the inclined upper portion and the inclined lower portion are provided so as to be exposed outside the longitudinal seam of the filter.   The filter cleaning head according to claim 1, wherein the suction hole is formed wider than a vertical joint width of the filter.

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