JP2010253418A - Filtration system with backwashing function and method of washing filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtration system with a backwashing function which dispenses with a pump and the like exclusively for backwashing and can perform stable backwashing by backwashing with a raw water supply pump. <P>SOLUTION: In the filtration system S with a backwashing function which is configured so that raw water is supplied to a pair of filters A, B through a raw water supply passage 25 by a pump P and treated water filtered by the filters is discharged through a discharge pipe 28, one of the filters can be backwashed with the treated water filtered by the other filter by switching of a first direction change valve 3 and a second direction change valve 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filtration system with a reverse cleaning function that can back-wash a filter with treated water obtained by filtering raw water, and a method for cleaning the filter.

  The conventional filtration system supplies the raw filtered water from the raw water supply passage to the upstream chamber upstream of the filter medium layer in the filter tank by the raw water pump, and the treated water filtered through the filter medium layer from this upstream chamber. Is supplied from the downstream downstream chamber through the treated water supply passage through the treated water supply passage to the external water storage tank, and the treated water accumulated in the water storage tank is supplied to the water supply section.

  When the filter medium layer becomes clogged and it is necessary to clean the filter medium layer, the treated water in the water storage tank is sent from the backwash water supply passage through the water collecting pipe to the downstream filtration chamber by the backwash pump. By passing the filter medium layer in the reverse direction from the downstream chamber to the upstream chamber by the pressure of the backwash pump, the suspended matter in the filter medium layer is taken out to the upstream chamber side. The water is discharged from the upstream chamber through the backwash water discharge passage.

  In addition to the above filtration system, a filter having a water storage chamber on the upper side of the filtration chamber is known (for example, see Patent Document 1). Such a filter supplies the treated water as backwashed water from the water collecting pipe to the downstream portion by the dead weight of the treated water stored in the water storage chamber with the backwash opening / closing valve opened at the time of backwashing. Is.

JP 2001-276518 A

  However, in the former filtration system using the backwash pump, the treated water in the water storage tank is fed from the backwash water supply passage through the water collecting pipe into the filtration downstream chamber by the backwash pump and used for the backwash. According to the pressure of the pump, the filter medium layer is passed in the reverse direction from the downstream chamber toward the upstream chamber. As a result, the backwash water must be sent to the filtration tank using a dedicated backwash pump, and a backwash pipe having a special pump called a backwash pump is required.

  The filtration system having a water storage chamber on the upper side of the latter filtration chamber is configured to supply the treated water as backwash water from the water collecting pipe to the downstream portion by the dead weight of the treated water in the water storage chamber during backwashing. is there. For this reason, if the water storage chamber for securing sufficient water pressure is small, the amount of treated water stored is reduced, and sufficient water pressure cannot be secured during backwashing, resulting in a problem that the entire system becomes large. . For example, since it is disadvantageous when a system such as a fishing boat for fishing bandits is mounted, there has been a demand for a filtration system that can easily and stably perform backwashing regardless of the amount of treated water stored.

  Therefore, by adopting a pair of filters, the present invention can back-wash each filter by supplying treated water filtered by one filter to the other filter, As a result, there is no need for a dedicated pump or the like for backwashing, and backwashing can be performed easily and stably regardless of the amount of treated water stored by performing backwashing with a pump that supplies raw water. And

  The present invention has been made in order to solve the above problems, and the filtration system with a reverse cleaning function of the present invention is configured such that raw water is supplied to a filter through a raw water supply path by a pump, and is filtered by the filter. In the filtration system with a reverse cleaning function configured to discharge treated water through a discharge path, a pair of the filters are provided, and the raw water supply path is connected to a raw water inlet side of the filter. A first directional switching valve is provided at a branch portion of the branch path, and a first direction switching valve that switches a raw water flow direction so that the raw water flows through at least one of the branch paths. The connecting path is connected to the discharge path, and the treated water discharged from one filter flows into the other filter through the connection path. And from one filter The second directional control valve 3 can be issued treated water is switched to the position to flow the discharge path is in fact provided in the branch portion between the exhaust passage and the connecting passage.

  In the filtration system with a reverse cleaning function, the second direction switching valve is a three-way switching valve, and the second direction switching valve is configured such that treated water discharged from one filter is connected between the discharge path and the connection path. This is because it is configured to be able to switch to the position where both flow.

  In the filtration system with a reverse cleaning function, it is preferable that a bypass path is connected between the raw water supply path and the discharge path.

  A method for backwashing a filter using the filtration system with a backwashing function, wherein raw water is supplied to one filter and filtered, and then the filtered treated water is passed through a connecting path to the other filter. The other filter is back-washed with the treated water, and the treated water after the washing is discharged.

  A method for backwashing the filter, wherein raw water is supplied to at least one filter for a certain period of time and filtered, and after the filtration time has elapsed, the other filter is backwashed with treated water, Is to discharge the treated water.

  In the present invention, the other filter can be back-washed with clean treated water that has passed through one filter. As a result, there is no need for a dedicated pump for backwashing or a tank for washing water, and the backwashing can be performed by a pump that supplies raw water, so that it is possible to easily and stably carry out backwashing regardless of the amount of treated water stored. There is.

1 is an exploded perspective view of a filtration system with a reverse cleaning function according to an embodiment of the present invention. It is sectional drawing of the filter used for the filtration system. It is a figure which shows the outline in the case of filtering seawater using both the filters in the filtration system. It is a figure which shows the outline in the case of filtering seawater with the other filter in the same filtration system, and backwashing one filter. It is a figure which shows the outline in the case of filtering seawater with one filter in the filtration system, and back-washing the other filter. It is a figure which shows the outline in the case of backwashing one filter in the filtration system. It is a figure which shows the outline in the case of back-washing the other filter in the filtration system. It is a figure which shows the outline in the case of filtering seawater using one filter in the filtration system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 8 show an embodiment of the present invention, FIG. 1 shows a filtration system with a reverse cleaning function of this embodiment, and FIG. 2 shows a filter.

  The filtration system S with a reverse cleaning function of this embodiment includes a pair of filters A and B. As shown in FIG. 2, each filter A, B includes a casing 1 and a filter medium 2 provided in the casing 1.

  The casing 1 is an upper casing 10 and a lower casing 11 that are detachably screwed together. On the side surface of the upper casing 10, a cylindrical first port portion 12 is projected as a raw water inlet side communicating with the inside of the casing 1. Further, a cylindrical second mouth portion 13 is protruded from the top surface of the upper casing 10 as a treated water outlet side communicating with the casing 1.

  A drain pipe 15 communicating with the inside of the casing 1 is connected to the lower portion of the lower casing 11, and the drain pipe 15 can be freely opened and closed by a drain cock 16 as an on-off valve.

  The filter medium 2 can be appropriately set depending on the raw water to be filtered, and is not particularly limited. For example, a hollow fiber membrane type element 2a can be employed. The upper part of the filter medium 2 is detachably fixed to the top surface of the upper casing 10 through a fixing member 18 having water permeability.

  One ends of L-shaped pipes 20 and 21 are connected to the first mouth portions 12 of both the filters A and B, respectively. The other ends of both pipes 20 and 21 are opposed to each other, and the first direction switching valve 3 is connected thereto.

  As shown in FIG. 3, the first direction switching valve 3 is a three-way ball valve having three-direction ports P1, P2, and P3, and the other ends of both pipes 20 and 21 are the first direction switching valve. 3 connection parts 31 and 32. Further, one end of a supply pipe 25 to which raw water before filtration is supplied by a pump P is connected to the connection portion 33 of the first direction switching valve 3.

  Here, the supply pipe 25 and the pipes 20 and 21 constitute a raw water supply path, and the pipes 20 and 21 constitute a branch path, respectively. The first direction switching valve 3 is provided at a branch portion of the branch path. The direction switching operation of the port of the first direction switching valve 3 is performed by rotating the handle 35.

  One ends of L-shaped pipes 26 and 27 are connected to the second mouth portions 13 of both the filters A and B, respectively. The other ends of both the pipes 26 and 27 are opposed to each other, and the second direction switching valve 5 is connected thereto. As shown in FIG. 3, the second direction switching valve 5 is a three-way ball valve having three-direction ports P4, P5, and P6. The other ends of both pipes 26 and 27 are the second direction switching valve. 5 connection parts 51 and 52. In addition, the connection pipe 53 of the second direction switching valve 5 is connected to a discharge pipe 28 through which raw water (treated water) filtered by the filters A and B is discharged.

  Here, a connecting path is constituted by the pipes 26 and 27, and a discharge path is constituted by the discharge pipe 28. Moreover, the 2nd direction switching valve 5 is provided in the branch part of a connection path and a discharge path. The direction switching operation of the port of the second direction switching valve 5 is performed by rotating the handle 55.

  A bypass pipe 30 as a bypass path is connected between the supply pipe 25 and the discharge pipe 28. In addition, 30a is an on-off valve provided in the upstream part of the bypass pipe 30.

  The filtration system S with a reverse cleaning function according to the present embodiment has the above-described configuration. Next, a case where the filtration system S with a reverse cleaning function is employed in, for example, a fishing boat for a bandit fishing will be described. In such a case, the raw water is seawater, and the treated water filtered by the present filtration system S is appropriately supplied to a water tank in which live bandits are placed.

  First, the case where both the filters A and B are used to filter contaminated seawater with bandit ink will be described with reference to FIG.

  The first direction switching valve 3 and the second direction switching valve 5 are switched as shown in FIG. Specifically, in the first direction switching valve 3, the port P 1 is communicated with the supply pipe 25, the port P 2 is communicated with the pipe 20, and the port P 3 is communicated with the pipe 21. As a result, the supply pipe 25 communicates with both the pipes 20 and 21.

  In the second direction switching valve 5, the port P 4 is communicated with the discharge pipe 28, the port P 5 is communicated with the pipe 27, and the port P 6 is communicated with the pipe 26. As a result, both the pipes 26 and 27 communicate with the discharge pipe 28. In addition, the drain cock 16 and the on-off valve 30a of both the filters A and B are closed.

  Next, when seawater is supplied to the supply pipe 25 by the pump P, the seawater enters the first directional control valve 3 from the port P1, flows through the pipe 20 from the port P2, and is supplied to the filter A through the first port portion 12. Is done. The seawater supplied to the filter A enters the filter medium 2 and is filtered by the filter medium 2 as indicated by a solid arrow X in FIG.

  The filtered treated water is discharged from the filter A through the second port portion 13, flows through the pipe 26, and enters the second direction switching valve 5 from the port P6. Further, the treated water flows through the discharge pipe 28 via the port P4 and is supplied to the water tank.

  The seawater that has entered the port P3 of the first direction switching valve 3 flows through the pipe 21 and is supplied from the first port 12 to the filter B. The treated water filtered by the filter B in the same manner as described above flows out from the second port 13, passes through the pipe 27, and flows through the discharge pipe 28 via the ports P 5 and P 4 of the second directional switching valve 5. Supplied to the aquarium.

  As described above, since seawater is supplied to the water tank after being filtered by both the filters A and B, the seawater filtration ability is improved.

  Further, a case will be described in which one of the filters A and B is separately backwashed after a predetermined filtration time has elapsed. In addition, the other which does not backwash is used, and maintains the state which filtered seawater.

  First, the case where the filter A is back-washed will be described with reference to FIG. In such a case, as shown in FIG. 4, the first direction switching valve 3 is switched to the direction position on the filter B side. Specifically, in the first direction switching valve 3, the port P <b> 2 is communicated with the supply pipe 25 and the port P <b> 1 is communicated with the pipe 21. Thereby, the supply pipe 25 communicates with the pipe 21 connected to the filter B and is disconnected from the pipe 20 connected to the filter A. In addition, the 2nd direction switching valve 5 is the same as that of the case of FIG.

  As described above, the treated water filtered by the filter B is supplied to the discharge pipe 28 via the second direction switching valve 5 and partly flows through the pipe 26 via the second mouth portion 13. Supplied to filter A. Thus, the treated water supplied to the filter A flows through the filter A in the direction opposite to that during filtration, as indicated by the phantom arrow Y in FIG. Therefore, the treated water removes dirt (foreign matter) clogged in the filter medium 2 when flowing in the reverse direction of the filter medium 2. The dirt detached from the filter medium 2 becomes floating matter in the water and is drained through the drain pipe 15 with the drain cock 16 open together with the treated water.

  Next, when the filter B is back-washed, as shown in FIG. 5, the first direction switching valve 3 is switched to the direction position on the filter A side. Specifically, in the first direction switching valve 3, the port P 3 is communicated with the supply pipe 25 and the port P 1 is communicated with the pipe 20. As a result, the supply pipe 25 communicates with the pipe 20 connected to the filter A and is disconnected from the pipe 21 connected to the filter B. In addition, the 2nd direction switching valve 5 is the same as that of the case of FIG.

  Accordingly, the treated water filtered by the filter A is supplied to the discharge pipe 28 via the second direction switching valve 5, and a part of the treated water flows through the pipe 27 and passes through the second port 13 to the filter B. To be supplied. Thus, when the treated water supplied to the filter B flows through the filter medium 2 in the reverse direction, the filter medium 2 is back-washed, and the dirt released from the filter medium 2 becomes suspended in water and along with the treated water, The drain cock 16 is drained through the open drain pipe 15.

  Moreover, the filtration system S with a reverse cleaning function of this Embodiment can reverse-clean one of the filters A and B, without supplying treated water to a water tank.

  First, the case where the filter A is washed will be described with reference to FIG.

  The first direction switching valve 3 and the second direction switching valve 5 are switched as shown in FIG. Specifically, the first direction switching valve 3 is switched to the direction position on the filter B side, and the second direction switching valve 5 is connected to the pipes 26 and 27, and the pipes 26 and 27 and the discharge pipe 28 are connected. Switch to the direction position to shut off.

  In this way, by setting the first direction switching valve 3 and the second direction switching valve 5, the raw water that has passed through the first direction switching valve 3 flows through the pipe 21 and is supplied to the filter B. The treated water filtered by the filter B flows through the pipe 27, the second direction switching valve 5 and the pipe 26 and is supplied to the filter A. The treated water supplied to the filter A is discharged from the drain pipe 15 after the filter medium 2 of the filter A is back-washed.

  Next, the case where the filter B is washed will be described with reference to FIG. The first direction switching valve 3 and the second direction switching valve 5 are switched as shown in FIG. Specifically, the first direction switching valve 3 is switched to the direction position on the filter A side, and the second direction switching valve is the same as that shown in FIG.

  In this way, by setting the first direction switching valve 3 and the second direction switching valve 5, the raw water that has passed through the first direction switching valve 3 flows through the pipe 20 and is supplied to the filter A. The treated water filtered by the filter A flows through the pipe 26, the second direction switching valve 5 and the pipe 27 and is supplied to the filter B. Then, the treated water supplied to the filter B is discharged from the drain pipe 15 after the filter medium 2 of the filter B is back-washed.

  Moreover, the filtration system S with a reverse cleaning function of this Embodiment can filter seawater on one side of the filter A and B, and can also supply a treated water to a water tank. For example, as shown in FIG. 8, the 1st direction switching valve 3 and the 2nd direction switching valve 5 are switched to the direction position on the filter A side. In this way, by setting the first direction switching valve 3 and the second direction switching valve 5, the raw water that has passed through the first direction switching valve 3 flows through the pipe 20 and is supplied to the filter A. The treated water filtered by the filter A flows through the pipe 26, the second direction switching valve 5, and the discharge pipe 28 and is supplied to the water tank.

  In addition, the process water filtered with the filter B can be supplied by switching the 1st direction switching valve 3 and the 2nd direction switching valve 5 to the direction position of the filter B side. When seawater is filtered on one side of the filters A and B, seawater and treated water do not flow on the other side. Therefore, the unused side can be removed from the pipe for replacement and maintenance.

  When both filters A and B are simultaneously maintained, or when the filters A and B are unnecessary, the first direction switching valve 3 and the second direction switching valve 5 are closed and the on-off valve 30a is opened. To do. Thereby, the supply pipe 25, the bypass pipe 30, and the discharge pipe 28 communicate with each other, and the raw water can be directly guided to the discharge pipe 28 and discharged without passing through the filters A and B.

  As described above, the filtration system with reverse cleaning function S of the present embodiment is configured so that the reverse cleaning can be performed by the pump P that supplies the raw water. Dedicated piping with a pump and a dedicated pump for backwashing is not required. In addition, since the other water can be backwashed with clean treated water obtained by filtering one of the filters A and B, the backwashing can be performed reliably, efficiently and stably.

  In addition, since the backside cleaning of the desired filters A and B can be performed simply by switching the first direction switching valve 3 and the second direction switching valve 5, respectively, the backwashing operation can be performed easily and quickly. .

  In addition, the filtration system S with a reverse cleaning function of the present embodiment has a simple piping structure, a simple structure, can be downsized, and seawater can be used as cleaning water. It is effective to use.

  The present invention is not limited to the embodiment described above. For example, as indicated by phantom lines in FIG. 2, the filter medium 2 can be composed of a hollow fiber membrane 2 a and a cylindrical mesh element 2 b provided outside the hollow fiber membrane 2 a. In such a case, relatively large dirt can be filtered in advance by the cylindrical mesh element 2b. The cylindrical mesh element 2b is provided with a drain pipe 15a for discharging the filtered dirt, and the dirt can be discharged through the drain pipe 15a.

  Further, the handles 35 and 55 of the first direction switching valve 3 and the second direction switching valve 5 can be automatically operated by driving means such as a motor (not shown).

  Furthermore, in the said embodiment, although illustrated about two filters A and B as a pair, the number of filters A and B on one side is not limited to one, and a plurality of filters can be arranged in parallel. It is.

  Moreover, the filtration system S with the reverse cleaning function is not limited to the case of being used for ships, and it goes without saying that it can be adopted for a filtration system that filters any raw water.

A Filter B Filter P Pump S Filtration system 1 with reverse cleaning function Casing 2 Filter medium 3 First direction switching valve 5 Second direction switching valve 12 First port (raw water inlet side)
13 Second mouth (treated water outlet side)
15 Drain pipe 16 Drain cock 20 Pipe (branch path)
21 Pipe (branch path)
25 Supply pipe (raw water supply channel)
26 Pipe (connection path)
27 Pipe (connection path)
28 Discharge pipe 30 Bypass pipe (bypass)
30a On-off valve

Claims (5)

In the filtration system with a reverse cleaning function, the raw water is supplied to the filter through the raw water supply path by the pump, and the treated water filtered by the filter is discharged through the discharge path.
A pair of the filters are provided, and the raw water supply path is provided with branch paths connected to the raw water inlet side of the filter, respectively, and the raw water flow direction is switched so that the raw water flows through at least one of the branch paths. A first direction switching valve is provided at a branch portion of the branch path, and a connection path is connected to the treated water outlet side of both the filters, and the connection path is connected to the discharge path, The second can be switched between a position where treated water discharged from one filter flows into the other filter via the connection path and a position where treated water discharged from one filter flows into the discharge path. A filtration system with a reverse cleaning function, wherein the direction switching valve 3 is provided at a branch portion between the connection path and the discharge path.   2. The filtration system with a reverse cleaning function according to claim 1, wherein the second directional switching valve is a three-way switching valve, and the second directional switching valve allows treated water discharged from one filter to pass through the discharge path. And a filtration system with a reverse cleaning function, which is configured to be able to be switched to a position flowing through both the connecting path and the connecting path.   The filtration system with a reverse cleaning function according to claim 1 or 2, wherein a bypass path is connected between the raw water supply path and the discharge path.   It is the backwashing method of the filter using the filtration system with a backwashing function as described in any one of Claims 1-3, Comprising: After supplying raw water to one filter and filtering, it filtered A backwashing method for a filter, characterized in that treated water is supplied to the other filter via a connecting path, the other filter is backwashed with the treated water, and the treated water is discharged after the washing. .   5. The backwashing method for a filter according to claim 4, wherein the raw water is supplied to at least one filter for a certain period of time and filtered, and after the filtration time has elapsed, the other filter is inverted with treated water. A backwashing method for a filter, comprising washing and discharging treated water after the washing.

Images