JP4309143B2 - Automatic filter cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic cleaning device for a filter that filters sewage to obtain purified water. In particular, when the filter is clogged, the high-pressure cleaning water is sprayed using a nozzle to automatically remove foreign substances.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a filter built in a sewage filter or the like is installed in order to capture foreign matters mixed in the processing liquid, so that the filter is likely to be clogged due to foreign matters adhering thereto. When clogging occurs, it becomes difficult for the treatment liquid to pass through the filter, and the filtering action is significantly reduced. Therefore, it is necessary to clean the filter.
[0003]
In general, workers regularly remove the filter from the filter and use a brush or spatula to rub the surface of the filter to scrape off foreign matter. When rubbing the filter surface, remove foreign matter from the filter eyes (gap). It was difficult to remove by being further subdivided, and there was also a risk of damaging the filter when scraping.
In addition, there are also problems such as complicated attachment / detachment, replacement of consumables, maintenance, and the like.
[0004]
In order to solve the above problems, a reverse cleaning type cleaning method disclosed in Japanese Patent No. 2670831 (Patent Document 1) has recently been used.
The cleaning of the filter by the above reverse cleaning method is to arrange the cleaning liquid pipe outside the filter or in the hollow part of the filter, and spray the cleaning liquid from the nozzle attached to the cleaning liquid pipe in the direction opposite to the filtration direction, The particulate matter adhering to the filter is removed.
[0005]
[Patent Document 1]
Japanese Patent No. 2670831
[0006]
[Problems to be solved by the invention]
The cleaning system disclosed in Patent Document 1 does not disclose how the filter cleaning time is set. Since the processing liquid with a large amount of foreign matter is likely to clog the filter, it is necessary to automatically start cleaning at a necessary time, and it is particularly required to automate the cleaning time of the filter.
Further, in Patent Document 1, it is also disclosed that purified water after filtration is used as the cleaning liquid ejected from the nozzle. However, the pressure of the purified water after filtration often decreases, and the cleaning ability decreases when the pressure of the cleaning liquid decreases. There is also a problem that a stable cleaning effect cannot be obtained.
Although a cleaning apparatus having a reverse cleaning method is disclosed in addition to the above-mentioned Patent Document 1, most have a complicated structure in which the filter is partially cleaned in order to ensure cleaning power, There is also a problem that becomes the cause of failure and the necessity of maintenance increases.
[0007]
The present invention is intended to solve the above-mentioned problems, and when the filter is automatically washed, the washing liquid is used as high-pressure water to enhance the washing ability and perform stable washing, and the filter is divided and moved during washing. It is an object to be able to perform cleaning in the state at the time of cleaning.
[0008]
[Means for Solving the Problems]
  In order to solve the above problems, as a first invention, in a case provided with a processing liquid inlet port in which foreign matters are mixed and a filtered filtrate outlet port.With an upper lidA cylindrical filter is accommodated, and a treatment liquid reservoir that communicates with the treatment liquid inlet between the outer surface of the filter and the inner surface of the case, and a filtrate reservoir that communicates with the filtrate outlet is provided inside the filter. In an automatic cleaning device for a filter having a cleaning liquid supply pipe having a nozzle attached to the filtrate reservoir,
  The case includes a case main body having a flat bottom wall on a cylindrical peripheral wall, and a lid attached to the upper surface of the case main body,From the upper lid placed on the inner surface of the lidBottom of case bodyWallIn the case body insideInPlace the above filter,
  A filtrate outlet connected to the filtrate outlet pipe is opened at the center of the bottom wall of the case body, and the lower end of the filter is disposed on the upper surface of the outer peripheral wall surrounding the outlet of the filtrate. A drain discharge port connected to a drain pipe is provided on the bottom wall of the processing liquid reservoir between the filter and the inner peripheral surface of the case main body, and the upper part of the peripheral wall of the case main body is connected to the processing liquid introduction pipe. A treatment liquid inlet is provided, and the treatment liquid flowing in from the treatment liquid inlet is caused to flow down while swirling along the inner surface of the peripheral wall in the treatment liquid reservoir,
  In addition, the lidAnd the upper lidThe cleaning liquid supply pipe is rotatably penetrated, and the filtrate is circulated through the cleaning liquid supply pipe and pressurized with a cleaning pump, and / or a separately prepared cleaning liquid is supplied with the cleaning pump. And pressurizing and supplying the cleaning liquid supply pipe or the filter rotation motor;
  The rotation motor and the cleaning pump are driven and controlled by a signal from a differential pressure sensor that detects the differential pressure between the internal and external hydraulic pressures of the filter, or are driven and controlled by a timer, and the cleaning pump is driven by the nozzle. The high-pressure cleaning liquid is sprayed across the entire surface of the filter in the direction opposite to the filtration direction, the foreign matter adhering to the filter and the cleaning liquid are blown off to the treatment liquid reservoir, and the foreign matter-contaminated drain liquid is discharged to the drain pipe through the drain discharge port. There is provided an automatic filter cleaning device characterized in that the filter is configured to be made to have a structure.
[0009]
When the filtrate is circulated and reused, a circulation pipe branched from the filtrate outlet pipe communicated with the filtrate outlet is provided, and the circulation pipe is connected to the washing liquid supply pipe as washing water. The filtrate after filtration is used, and a washing pump is provided in the circulation pipe to supply the filtrate as high-pressure washing water to the washing liquid supply pipe.
Moreover, it is preferable that a strainer is provided at an upstream position of the cleaning pump.
[0010]
In the case of using both the circulating use of the filtrate and the separately prepared cleaning liquid, for example, the use of tap water, the branch pipe is branched from the tap water supply pipe at a position upstream from the pump for cleaning the circulation pipe, Is provided with a flow path switching valve.
If it is the said structure, according to the usage-amount of a filtrate, a tap water can be replenished and used as a washing | cleaning liquid.
[0011]
As described above, in the present invention, the timing for cleaning the filter by spraying the cleaning liquid from the nozzle is automatically set by the signal from the differential pressure sensor for the internal and external liquid pressure of the filter or / and the timer.
When setting with the signal from the differential pressure sensor, if the filter becomes clogged, the liquid pressure of the processing liquid will be higher than that of the filtrate, and it is necessary to start cleaning with the detection signal from the differential pressure sensor. The cleaning can be started automatically at the time. Instead of using this differential pressure sensor, it is also possible to know in advance the time when clogging occurs in advance and to automatically set the cleaning start time using a timer. In either case, the filter can be automatically washed by automatically spraying the cleaning liquid from the nozzle at the time when the filter should be washed, and the good filtering action by the filter can always be maintained stably. .
In addition, the setting of the cleaning time by the timer and the setting of the cleaning time by the signal of the differential pressure sensor are used together to perform regular cleaning by the timer, and when the filter suddenly becomes clogged, the differential pressure sensor detects it. May be cleaned.
[0012]
In particular, in the present invention, the water-saving effect is given by using the filtrate filtered by the filter as the cleaning liquid sprayed from the nozzle. However, in order to enhance the cleaning effect, high-pressure cleaning water is provided through a pump. In this way, when the pump is interposed, the liquid pressure of the cleaning liquid can also be controlled, and the cleaning liquid can be increased in pressure according to the contamination state of the processing liquid, so that the foreign substances adhering to the filter can be reliably removed.
[0013]
Driving means for rotating the cleaning liquid supply pipe or the filter is provided. That is, when the hollow portion of the filter is used as a filtrate reservoir, the cleaning liquid supply pipe suspended from the hollow portion of the filter is rotated to spray the cleaning liquid over the entire inner peripheral surface of the cylindrical filter. On the other hand, when the processing liquid is introduced into the hollow part of the filter to form a processing liquid reservoir, and the outside of the filter is used as a filtrate storage part, a cleaning liquid supply pipe is provided outside the filter to spray the cleaning liquid on the outer surface of the filter. It is preferable to fix the cleaning liquid supply pipe and rotate the filter.
[0014]
  As above,The hollow portion of the cylindrical filter is the filtrate reservoir, and the portion surrounded by the case inner peripheral surface and the filter outer peripheral surface is a treatment liquid reservoir.
  The cleaning liquid supply pipe has a length extending substantially along the central axis of the cylindrical filter, and nozzles are arranged at intervals in the length direction, and a rotation motor is provided at a portion protruding from the case of the cleaning liquid supply pipe. The rotating motor is driven when the pump is driven to rotate the cleaning liquid supply pipe, and the high pressure cleaning liquid is sprayed around the entire inner surface of the filter.
[0015]
  Further, as a second invention, contrary to the above configuration, the hollow portion of the cylindrical filter is used as a treatment liquid reservoir, and a portion surrounded by the case inner peripheral surface and the filter outer peripheral surface is stored as a filtrate storage. An automatic filter cleaning device is provided.
  In other words, inside the case with a treatment liquid inlet with foreign matter and a filtered filtrate outlet.With an upper lidA cylindrical filter is accommodated, and the inside of the filter serves as a treatment liquid reservoir that communicates with the treatment liquid inlet, and a filtrate reservoir that communicates between the filter outer surface and the case inner surface with the filtrate outlet. In an automatic cleaning device for a filter having a cleaning liquid supply pipe having a nozzle attached to the filtrate reservoir,
  The case includes a case main body having a flat bottom wall on a cylindrical peripheral wall, and a lid attached to the upper surface of the case main body,From the upper lid placed on the inner surface of the lidBottom of case bodyWallIn the case body insideInPlace the above filter,
  A processing liquid inlet connected to the processing liquid introduction pipe is opened at the center of the bottom wall of the case body so that the processing liquid flows in in the axial direction of the case, and an outer peripheral bottom wall surrounding the processing liquid inlet A lower end of the filter is disposed on the upper surface, a drain discharge port connected to a drain pipe is provided on the bottom wall sandwiched between the filter and the processing liquid inlet, and the upper part of the peripheral wall surrounding the processing liquid reservoir is Provide a filtrate outlet,
  The cleaning liquid supply pipe has a length over the entire length of the cylindrical filter, and is arranged at a predetermined position on the inner surface of the case while disposing nozzles at intervals in the length direction,
  A rotation motor is attached to a portion protruding from the case connected to the end face of the filter,
  Circulate the filtrate and pressurize and supply it with a cleaning pump, or / and pressurize and supply a separately prepared cleaning liquid with a cleaning pump,
  In addition, the cleaning pump and the rotation motor are driven and controlled by a signal from a differential pressure sensor that detects a differential pressure between the internal and external hydraulic pressures of the filter, or are driven and controlled by a timer to rotate the filter, and By driving the cleaning pump, high pressure cleaning liquid is sprayed from the nozzle to the entire outer periphery of the filter, and foreign matter and cleaning liquid adhering to the filter are blown off to the treatment liquid reservoir, and the foreign matter-contaminated drain liquid passes through the drain discharge port. The present invention provides an automatic filter cleaning apparatus characterized by being configured to be discharged into the drain pipe.
[0016]
  The drain pipe is the bottom of the treatment liquid reservoir.On the wallIn order to continue to the drain outlet provided, an open / close valve is provided, and the open / close valve is opened only when the cleaning liquid is driven by the pump to discharge the contaminated drain liquid, and the open / close valve is closed during filtration during non-washing. The untreated processing liquid introduced into the processing liquid reservoir is prevented from being discharged through the drain pipe.
[0017]
The filter is configured by a configuration in which wedge wires having a triangular cross section are connected in an annular arrangement in the axial direction, or a cylindrical material made of a mesh material or a punching material.
If the above-mentioned wedge wire is used as the filter material, it can be a filter having a slit over the entire length in the axial direction, and by allowing the gap between adjacent wedge wires to be appropriately dimensioned, it is possible to easily set the allowable filter passage size. Can be set. And since it is a cross-sectional triangle, the contact area with the foreign material at the time of filtration is small, and it is hard to generate | occur | produce clogging with a foreign material. And since the wedge wire which consists of a thick metal rod has rigidity, even if it injects high pressure washing water, a deformation | transformation will not arise.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 to 6 show a filter 10 according to the first embodiment, in which a cylindrical filter 12 is accommodated in a cylindrical case body 11, and a cleaning liquid is stored in a filtrate reservoir A comprising a hollow portion of the filter 12. In a state in which the nozzle header 14 connected to the supply pipe 13 is accommodated, a lid 15 is attached to the upper surface of the case body 11 to form a sealed structure inside the case. A cleaning liquid inlet 15a is provided at the center of the lid 15, the cleaning liquid supply pipe 13 is rotatably passed through the cleaning liquid inlet 15a, the nozzle header 14 is connected to the lower end of the cleaning liquid supply pipe 13, and the nozzle header 14 is connected to the filtrate reservoir. It is arranged over substantially the entire length of A. An annular space between the outer peripheral surface of the filter 12 inside the case and the inner surface of the case is used as a processing liquid reservoir B in which foreign matters are mixed.
[0019]
  At the center of the bottom wall 11 a of the case body 11, a filtrate outlet 11 b communicated with the filtrate reservoir A is opened, and a filtrate outlet pipe 16 is connected. Further, a drain discharge port 11 c communicated with the processing liquid reservoir B is provided in the bottom wall 11 a and is connected to the drain pipe 17. Further, a processing liquid inlet 11e is provided at the upper part of the peripheral wall 11d of the case 11, and is connected to a processing liquid introduction pipe 18 for introducing a processing liquid made of sewage mixed with foreign substances.As shown in FIG. 1, the processing liquid inlet 11e is provided in the peripheral wall 11d so that the introduced processing liquid flows down while turning in the processing liquid reservoir B.
[0020]
As shown in FIGS. 3 and 4, the filter 12 forms a cylinder by using a large number of wedge wires 20 having a substantially triangular cross section as a filter material. Specifically, the apex 20a of the wedge wire 20 is set to the inner peripheral side, the bottom side 20b is set to the outer peripheral side in the vertical direction, and a plurality of wedge wires 20 are adjacent to each other in the circumferential direction to form a cylinder. An annular assembly bar 21 is arranged on the surface with an interval in the axial direction, and these assembly bars 21 are assembled to each wedge wire 20 by welding. At that time, the size of the foreign matter to be captured is set by adjusting the size of the gap 20 c between the adjacent bottom sides 20 a of the wedge wire 20.
[0021]
The processing liquid passes from the outer peripheral side to the inner peripheral side with respect to the filter 12, and the contaminated foreign matter S is captured by the gap 20c of the wedge wire 20, so that the processing liquid Q1 becomes the filtrate Q2 and the hollow portion of the filter 20 Into the filtrate reservoir A.
[0022]
In the filtrate reservoir A of the hollow part of the filter 12, the nozzle header 14 having a rectangular tube shape connected to the lower end of the cleaning liquid supply pipe 13 is located in the center, and the nozzle header 14 has a longitudinal direction. A nozzle tip 23 is attached at a facing position with a gap. The cleaning liquid Q3 sprayed from the nozzle tip 23 is sprayed from the inner peripheral side to the outer peripheral side of the filter 12 in the direction opposite to the filtration direction of the processing liquid.
At that time, when the cleaning liquid Q3 sprayed from the nozzle tip reaches the wedge wire 20, it is condensed and rapidly increased while moving toward the minimum gap for capturing foreign matter. As a result, the foreign matter can be blown away with a stronger force.
The cleaning liquid Q3 sprayed from the nozzle tip 23 is a fan-shaped spray, the spray from each nozzle chip 23 is a fan-shaped spray, and the cleaning liquid is sprayed over the entire length of the filter 12 by wrapping adjacent sprays.
[0023]
Further, a rotating plate 24 is fitted and fixed to the cleaning liquid supply pipe 13 protruding upward from the lid 15, and the rotating plate 24 is rotated by a rotation motor 25 mounted on the lid 15 to rotate the nozzle header 14. The nozzle tip 23 is moved along the inner peripheral surface of the filter 12, and the cleaning liquid is sprayed to the entire periphery of the filter 12.
[0024]
FIG. 2 is an overall system diagram showing the piping connected to the filter 10 and the electric control system. A circulation pipe 27 is branched from the filtrate extraction pipe 16, and the circulation pipe 27 is connected to the cleaning liquid supply pipe 13 via a rotary bearing (not shown). A cleaning pump 28 is interposed in the circulation pipe 27. Further, a strainer 55 is interposed upstream of the cleaning pump 28 to minimize maintenance of the cleaning pump 28.
In order to control the driving of the cleaning pump 28, a differential pressure sensor 30 is provided for detecting a differential pressure between the pressure P1 of the processing liquid reservoir B and the pressure P2 of the filtrate reservoir A in the filter 10. The detection signal of the differential pressure sensor 30 is transmitted to the controller 31. When P1> P2 is satisfied and P1> P2 continues for the set time T1, the controller 31 performs control to drive the pump 28 and starts cleaning. I am doing so.
[0025]
In addition, it is good also as a setting which drives the pump 28, when P1> P2 and P1 becomes larger than the preset threshold value. Furthermore, it is good also as a setting which drives the pump 28 by a set time interval and performs washing | cleaning intermittently using a timer irrespective of the pressure detection by the said differential pressure sensor 30. FIG. Furthermore, a timer and a differential pressure sensor may be used in combination.
[0026]
Further, the circulation pipe 27 is branched from the tap water supply pipe 50 on the upstream side of the strainer 55, and a flow path switching valve 51 is interposed at this branch position. That is, when the amount of the filtrate used increases, it is not used for cleaning, and cleaning can be performed with tap water.
[0027]
The drain pipe 17 is provided with a flow path opening / closing valve 32, and the opening / closing valve 32 is controlled to open / close by the controller 31, and the opening / closing valve 32 is opened during the cleaning period when the pump 28 is driven. Sometimes the on-off valve 32 is closed.
The processing liquid introduction pipe 18 communicates with the processing liquid tank 35 via an opening / closing valve 33 and a pump 36. A bypass pipe 39 is provided between the pump 36 and the opening / closing valve 33, and the opening / closing valve 56 is interposed in the bypass pipe 39 and the tip is communicated with the filtrate outlet pipe 16. The filtrate outlet pipe 16 is provided with an on-off valve 40 upstream from the communication position with the bypass pipe 39. From the joining position of the filtrate take-out pipe 16 and the bypass pipe 39, it communicates with the supply pipe 38 of the special cleaning nozzle 37.
[0028]
When the filter 12 is removed from the filter 10 for maintenance or the like, the on-off valves 33 and 40 are closed, while the on-off valve 56 of the bypass pipe 39 is opened, and the liquid in the processing liquid tank 35 is supplied to the supply pipe 38 through the bypass pipe 39. Supply.
[0029]
In the apparatus configured as described above, as shown in FIG. 5, when the foreign matter captured by the filter 12 adheres to the gap 20c of the wedge wire 20 of the filter and the filter 12 is clogged, the pressure of P1 increases. Thus, P1> P2. When this relationship is detected by the differential pressure sensor 30 and transmitted to the controller 31 and the set time T1 has elapsed, the cleaning pump 28 is driven to supply the cleaning liquid to the cleaning liquid supply pipe 13 at a high pressure. Note that the discharge pressure of the cleaning pump 28 may be set to be constant in advance, or the discharge pressure may be automatically controlled in accordance with the value detected by the differential pressure sensor. That is, when the differential pressure is large and the filter 12 is clogged, the discharge performance may be increased to increase the cleaning water to increase the cleaning performance.
[0030]
Simultaneously with the driving of the cleaning pump 28, the controller 31 drives the rotation motor 25 to rotate the nozzle header 14. At the same time, the on-off valve 32 of the drain pipe 17 is opened.
[0031]
Filtrate Q3 pressurized to a required pressure is supplied from the pump 28 to the cleaning liquid supply pipe 13 and passes through the nozzle header 14 rotating in the filtrate reservoir A of the hollow portion of the filter 12 from the nozzle tip 23 as shown in FIG. ), The filtrate 12 is sprayed toward the inner peripheral surface of the filter 12 in the direction opposite to the filtration direction, and becomes high-pressure washing water, and the filter 12 is washed. At the time of this cleaning, as shown in FIG. 6B, the foreign matter S adhering to the surface of the wedge wire 20 of the filter 12 and accumulating in the gap 20c is blown off to the processing liquid reservoir B on the outer peripheral side of the filter 12. .
The cleaning liquid after cleaning mixed with the foreign matter S blown to the processing liquid reservoir B is discharged through the drain pipe 17 from the drain port provided in the bottom wall 11a of the case body 11.
[0032]
The cleaning is performed for a period set in advance by the controller 31, and after the period has elapsed, the pump 28 is stopped and the on-off valve 32 is closed.
Even when the filter is washed, the processing liquid is continuously introduced from the processing liquid tank 35 to the filter 10 together with the slut, and the filtration liquid is continuously taken out so as not to stop the line.
[0033]
As described above, clogging of the filter 12 is detected by the differential pressure sensor 30 and the filter 12 is automatically started to be washed, so that the filtering action can always be kept steady. In addition, it is not necessary to remove the filter from the case or move it at the time of cleaning, and it is not necessary to perform manual cleaning by workers. Further, since the filtrate is circulated and used as cleaning water, the water saving effect can be improved. .
[0034]
In the first embodiment, one filter 12 is arranged in the center of the case body. However, the case body has a large volume, a plurality of filters are arranged at intervals, and each filter is driven to rotate. It is preferable that a nozzle header is disposed, and a high pressure cleaning liquid is sprayed onto the filter from a nozzle chip attached to the nozzle header to reversely clean the filter. With this configuration, a large amount of processing liquid can be processed at a time.
[0035]
The cleaning liquid injection device disposed in the filtrate storage part A of the hollow portion of the filter 12 is a square header type shown in FIG. 7A, but as shown in FIG. 7B, a cleaning liquid supply pipe 13 ′ is provided. The filtrate is suspended to the vicinity of the lower end of the filtrate reservoir A, the nozzle adapter 42 is fixed to the cleaning liquid supply pipe 13 ′ at a constant interval in the lengthwise direction, and at a position opposed to 180 degrees, and the nozzle tip 23 is attached to the tip. It is good also as a structure attached to. Further, as shown in FIG. 7C, a nozzle tip 23 facing only one direction may be attached. Furthermore, as shown in FIG. 7D, the nozzle tip 23 may be spirally attached to the cleaning liquid supply pipe 13 '.
Further, the differential pressure sensor 30 may be configured to detect a differential pressure between the filtrate in the filtrate outlet pipe 16 and the treatment liquid in the treatment liquid reservoir B in the filter 10.
[0036]
Further, when the wedge wire 20 is used as the filter material of the filter 12 as in the above-described embodiment, there is an advantage that clogging due to foreign matter is less likely to occur, but it may be made of resin instead of a metal wire. Further, a metal or resin mesh material shown in FIG. 8A may be used, and a metal punching metal or resin perforated plate shown in FIG. 8B may be used. .
[0037]
FIG. 9 shows a second embodiment.
In the second embodiment, the filtrate reservoir and the treatment liquid reservoir are reversed from those of the first embodiment, the hollow portion of the filter 12 'is the treatment liquid reservoir B', and the outside of the filter 12 'is the filtrate reservoir A'. It is said. Accordingly, the treatment liquid inlet 11e ′ is provided in the case bottom wall 11a ′ to communicate with the treatment liquid reservoir B ′ of the hollow portion of the filter 12 ′, and the filtrate outlet 11b ′ is provided in the peripheral wall 11d ′. . Further, the drain discharge port 11c 'is provided at a position communicating with the processing liquid reservoir B' on the bottom wall.
[0038]
As in the first embodiment, the cleaning liquid supply pipe 13 ′ that circulates the purified water after filtration and is pressurized with a pump to inject the high-pressure cleaning liquid is fixed along the inner surface of the peripheral wall 11d ′ of the case body 11 ′. Yes.
On the other hand, an upper lid 12a ′ is attached to the upper end surface of the filter 12 ′ disposed in the center of the case, a support shaft 50 is projected from the center of the upper cover 12a ′, and the support shaft 50 is projected from the cover 15 ′. As in the first embodiment, the support shaft 50 is rotationally driven by a rotation motor 25 ′ mounted on a lid 15 ′.
[0039]
The filter 12 'is formed of a metal mesh having a cylindrical shape. The cleaning liquid supply pipe 13 ′ protrudes toward the filter 12 ′ with an interval in the length direction, and a nozzle chip 23 ′ is attached. The cleaning time for driving the pump 28 'to the cleaning liquid supply pipe 13' to introduce clean water is set by a timer by predicting the period during which the filter 12 'is clogged, and the pump is automatically pumped after the required time has elapsed. 28 'is driven and the filter rotating motor 25' is driven to perform cleaning. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
In the second embodiment, the filter 12 'is not limited to the metal mesh, and various types of filters described above can be used. Further, the cleaning time is not limited to the timer, and a differential pressure sensor may be used as in the first embodiment, or the timer and the differential pressure sensor may be used in combination.
[0040]
In the second embodiment, the treatment liquid mixed with the solid foreign matter introduced into the treatment liquid reservoir B ′ of the hollow portion of the filter 12 ′ flows from the inside to the outside of the filter 12 ′, and the foreign matter passes through the filter 12 ′. Is trapped, and the filtrate is collected in the filtrate reservoir A ′ outside the filter 12 ′ and taken out through the filtrate outlet pipe 16 ′.
[0041]
When clogging occurs in the filter 12 ', the pump 28' is automatically driven by the operation of the timer to supply high-pressure cleaning water to the cleaning liquid supply pipe 13 'and the outer periphery of the filter 12' from the nozzle tip 23 '. Inject high-pressure washing water toward the surface. At the same time, the filter rotating motor 25 'is driven to rotate the filter 12'. Therefore, high-pressure washing water can be sprayed from the nozzle tip 23 ′ toward the entire outer peripheral surface of the filter 12 ′.
[0042]
The sprayed high-pressure washing water blows off foreign matters adhering to the mesh of the filter 12 'to the treatment liquid reservoir B' in the filter 12 ', and reverse-washes the filter 12' as in the first embodiment. The foreign matter and cleaning liquid blown off into the processing liquid reservoir B 'are discharged from a drain discharge port provided on the bottom wall in the processing liquid reservoir B'.
[0043]
Also in the second embodiment, a plurality of cylindrical filters 12 ′ are arranged inside the case body 11 ′, and a cleaning liquid supply pipe 13 ′ that injects high-pressure cleaning water toward each filter 12 ′ is provided inside the case. May be.
[0044]
【The invention's effect】
As is clear from the above description, according to the present invention, the filter cleaning can be automatically started, and full automation can be achieved without any manual intervention. And while circulating the filtrate as a cleaning liquid for cleaning the filter and reusing it to save water, it is pressurized by the pump and supplied to the nozzle, so the cleaning liquid can be sprayed to the filter with a strong force, Foreign matter adhering to the filter can be reliably removed. In particular, when a wedge wire is used as the filter, foreign matter can be reliably removed by the cleaning liquid sprayed from the nozzle.
In addition, even when cleaning liquid is sprayed from the nozzle to the filter, the introduction of the processing liquid into the filter is not stopped, the filtration action is continued, and the filtrate is supplied to the filtrate outlet pipe. Therefore, the introduction of the treatment liquid into the filter, the filtering action, and the removal of the filtrate are not interrupted, and the filter in the filter can be automatically washed without stopping the line.
[0045]
Furthermore, the nozzle for cleaning liquid injection is arranged over the entire length of the filter, and the cleaning liquid supply pipe or the filter is rotated, so that the cleaning liquid is sprayed over the entire circumference of the filter and the cleaning of the entire filter is automated without human intervention. be able to. In particular, when the cleaning liquid supply pipe is rotated, the filter can be left at the time of filtration, and has various advantages such as removal, movement, and decomposition of the filter from the filter are unnecessary. .
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view of a first embodiment of the present invention.
FIG. 2 is a system diagram of the first embodiment.
FIG. 3 is a cross-sectional view of the filter shown in FIG.
FIG. 4 is a partial perspective view of a filter.
FIG. 5 is a drawing showing a state in which foreign matter adheres to the filter.
6A is a view showing a state in which cleaning liquid is sprayed from a nozzle during cleaning, and FIG. 6B is a view showing a state in which foreign matter is removed from the filter.
7A shows the cleaning nozzle according to the first embodiment, and FIGS. 7B, 7C, and 7D show modifications.
FIGS. 8A and 8B are views showing a modification of the filter material. FIGS.
FIG. 9 is a partial cross-sectional perspective view of a second embodiment.
[Explanation of symbols]
10 Filter
11 Case body
11b Filtrate outlet
11c Drain outlet
11e Treatment liquid inlet
12 Filter
13 Cleaning liquid supply pipe
14 Nozzle header
15 lid
16 Filtrate outlet tube
17 Drain pipe
18 Treatment liquid introduction tube
20 Wedge wire
23 Nozzle tip
25 Motor for rotation
27 Circulation pipe
28 Cleaning pump
30 Differential pressure sensor
31 Controller
A Filtrate reservoir
B Treatment liquid reservoir
Q1 treatment liquid
Q2 Filtrate
Q3 High pressure cleaning liquid

Claims (5)

A cylindrical filter having an upper cover is accommodated in a case having a processing liquid inlet port in which foreign matter is mixed and a filtered filtrate outlet port, and the processing liquid inlet port is provided between the filter outer surface and the case inner surface. Automatic cleaning of a filter having a treatment liquid reservoir connected to the filter and a filtrate reservoir connected to the filtrate outlet, and a cleaning liquid supply pipe having a nozzle attached to the filtrate reservoir. In the device
The case is a case body having a flat bottom wall to the cylindrical wall, a lid to be attached to the upper surface of the case body, the case body at the bottom Kabema of the case body from the upper lid to place the inner surface of the lid inside and placing the filter,
A filtrate outlet connected to the filtrate outlet pipe is opened at the center of the bottom wall of the case body, and the lower end of the filter is disposed on the upper surface of the outer peripheral wall surrounding the outlet of the filtrate. A drain discharge port connected to a drain pipe is provided on the bottom wall of the processing liquid reservoir between the filter and the inner peripheral surface of the case main body, and the upper part of the peripheral wall of the case main body is connected to the processing liquid introduction pipe. A treatment liquid inlet is provided, and the treatment liquid flowing in from the treatment liquid inlet is caused to flow down while swirling along the inner surface of the peripheral wall in the treatment liquid reservoir,
Further, the cleaning liquid supply pipe is rotatably passed through the lid and the upper lid, and the filtrate is circulated through the cleaning liquid supply pipe and supplied with pressure by a cleaning pump, or / and separately prepared. And supplying the cleaning liquid pressurized with a cleaning pump, and provided with a motor for rotating the cleaning liquid supply pipe or the filter,
The rotation motor and the cleaning pump are driven and controlled by a signal from a differential pressure sensor that detects the differential pressure between the internal and external hydraulic pressures of the filter, or are driven and controlled by a timer, and the cleaning pump is driven by the nozzle. The high-pressure cleaning liquid is sprayed across the entire surface of the filter in the direction opposite to the filtration direction, the foreign matter adhering to the filter and the cleaning liquid are blown off to the treatment liquid reservoir, and the foreign-contaminated drain liquid is discharged to the drain pipe through the drain discharge port. A filter automatic cleaning device characterized by being configured to allow A processing liquid reservoir that houses a cylindrical filter having an upper lid inside a case having a processing liquid inlet port in which foreign matters are mixed and a filtered filtrate outlet port, and the inside of the filter communicates with the processing liquid inlet port And an automatic cleaning device for a filter having a filtrate reservoir connected between the outer surface of the filter and the inner surface of the case and the filtrate outlet, and a cleaning liquid supply pipe having a nozzle attached to the filtrate reservoir. In
The case is a case body having a flat bottom wall to the cylindrical wall, a lid to be attached to the upper surface of the case body, the case body at the bottom Kabema of the case body from the upper lid to place the inner surface of the lid inside and placing the filter,
A processing liquid inlet connected to the processing liquid introduction pipe is opened at the center of the bottom wall of the case body so that the processing liquid flows in in the axial direction of the case, and an outer peripheral bottom wall surrounding the processing liquid inlet A lower end of the filter is disposed on the upper surface, a drain discharge port connected to a drain pipe is provided on the bottom wall sandwiched between the filter and the processing liquid inlet, and the upper part of the peripheral wall surrounding the processing liquid reservoir is Provide a filtrate outlet,
The cleaning liquid supply pipe has a length over the entire length of the cylindrical filter, and is arranged at a predetermined position on the inner surface of the case while disposing nozzles at intervals in the length direction,
A rotation motor is attached to a portion protruding from the case connected to the end face of the filter,
Circulate the filtrate and pressurize and supply it with a cleaning pump, or / and pressurize and supply a separately prepared cleaning liquid with a cleaning pump,
In addition, the cleaning pump and the rotation motor are driven and controlled by a signal from a differential pressure sensor that detects a differential pressure between the internal and external hydraulic pressures of the filter, or are driven and controlled by a timer to rotate the filter, and By driving the cleaning pump, high pressure cleaning liquid is sprayed from the nozzle to the entire outer periphery of the filter, and foreign matter and cleaning liquid adhering to the filter are blown off to the treatment liquid reservoir, and the foreign matter-contaminated drain liquid passes through the drain discharge port. An automatic filter cleaning apparatus characterized in that the drain pipe is configured to discharge.   A circulation pipe branched from the filtrate outlet pipe communicated with the filtrate outlet is provided, the circulation pipe is connected to the washing liquid supply pipe, and the filtrate after filtration is used as the washing liquid. 2. A filtration pump as a high-pressure cleaning liquid is supplied to the cleaning liquid supply pipe via a cleaning pump, and a strainer is provided upstream of the cleaning pump in the circulation pipe. 2. The automatic filter cleaning apparatus according to 2.   4. The automatic filter according to claim 1, wherein an open / close valve is provided in the drain pipe, and the open / close valve is opened when the cleaning pump is driven to discharge the drainage contaminated drain liquid. 5. Cleaning device.   5. The filter according to any one of claims 1 to 4, wherein the filter is configured by connecting a wedge wire having a triangular cross-section in an annular shape in parallel and connected, or a cylindrical material made of a mesh material or a punching material. 2. An automatic filter cleaning apparatus according to item 1.

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