JP4220074B2 - Filtration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filtration device that is installed in a fluid intake port or a pipeline for transferring fluid, and removes dust contained in the fluid and foreign matter to be separated, and in particular, rationally clogs the filtration screen. The present invention relates to a filtering device having a function of eliminating.
In this specification, the term “fluid” generically represents liquid and gas. In addition, the term “foreign matter” means various kinds of dust and foreign matters to be separated, such as gravel, grass algae, slurry, granules, substance pieces, etc. when the fluid is liquid, Dust, granules, substance fragments, etc. are generically represented.
[0002]
[Prior art]
Conventionally, as a general filtration device, for example, a method of stretching a screen made of, for example, a wire net, a perforated plate, a slit plate, etc., a cyclone method, a centrifugal separation method, etc. have been widely used.
The biggest problem with these general filtration devices is how to discharge foreign matter accumulated on the screen, that is, how to deal with clogging. Various proposals have been made, such as a sieving method, a scraping method, and a backwash method. However, in any case, the discharge means becomes a large-scale device or the production cost is high, and any method has technical problems such as being far from perfect clogging countermeasures. It was.
[0003]
One clear solution to this problem was presented by the invention of International Publication No. WO 97/05939 (International Application PCT / JP96 / 01724 “Self-jet cleaning filtration device”). (Hereinafter, this invention is referred to as “original invention”.)
As illustrated in FIG. 7, the structure of the filtering device of the original invention is provided with a screen 11 that slides in the flow direction along the inner surface of a container 1 having an inlet channel a and an outlet channel d. In addition, a foreign matter discharge port 15 is provided between the screen 11 and the inlet channel a, an outlet opening / closing valve 14 is provided in the outlet channel d, and the screen 11 is connected to the drive device 3 via the drive shaft 4. It is connected. The drive device 3 includes a cam 5 that drives the drive shaft 4 in an upstream direction (downward in the figure), and a biasing force member 6 that biases the drive shaft 4 in a downstream direction (upward in the figure). As a result, the screen 11 is driven slowly in the upstream direction and rapidly in the downstream direction.
[0004]
In order to discharge the foreign matter accumulated on the screen 11, when the outlet on-off valve 14 is first closed to shut off the downstream flow path on the screen and then the driving device 3 is operated, the screen 11 moves gently in the upstream direction. When the fluid flows, the fluid gradually permeates through the screen 11 to fill the bag chamber-like section sandwiched between the screen 11 and the outlet opening / closing valve 14, and then turns to rapidly move the screen 11 in the downstream direction. When the fluid is filled, the fluid filling the bag compartment is ejected from the downstream side to the upstream side of the screen 11 at once, and the foreign matter accumulated on the upstream surface of the screen 11 is peeled off by the force of the self-injection. . Thereafter, the foreign matter discharge port 15 is opened, and the separation foreign matter is taken out from the foreign matter discharge port 15 while operating the inlet opening / closing valve 23 to adjust the discharge momentum.
[0005]
[Problems to be solved by the invention]
The filtration device of the original invention peels off the foreign matter accumulated on the screen from the screen by the force of the self-injection of the fluid by changing the volume of the compartment confining the fluid downstream of the screen. Although it is an excellent filtration device having a higher foreign substance peeling ability compared to the filtration device, there are still unsolved problems. That is, if the filtration process is restarted immediately after the foreign substance is peeled off, there is a high possibility that a part of the foreign matter that has been peeled off, especially light foreign matter, will rise and be adsorbed on the screen again. Therefore, there is an operational restriction that the foreign matter must be discharged from the foreign matter discharge port every time the foreign matter is peeled off.
[0006]
Therefore, the present invention solves the problem still remaining in the original invention with a simple configuration, is easy to design and manufacture, and can not only easily remove clogged foreign matter by manual operation or automatic operation by an actuator. An object of the present invention is to obtain a high-performance and convenient filtration device that prevents foreign matter once peeled off from being re-adsorbed on the screen and makes the discharge operation easier and more flexible.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a filtration device according to the present invention includes an upstream inlet channel, a downstream outlet channel, and an inner surface of the container that is stretched between both channels. And a foreign matter discharge port on the upstream side of the screen, and the screen is gently moved in the upstream direction and in the downstream direction by a drive device via a drive shaft. In a rapidly driven filtration device, the inlet flow path is provided with an inlet check valve that allows only a downstream flow and does not allow a reverse flow, and the outlet flow path is provided with an outlet opening / closing valve, A partition plate that slides along the inner surface of the container in conjunction with the screen is provided between the foreign material discharge ports, and a foreign material retention chamber is formed between the partition plate and the foreign material discharge port, Only the flow from the screen to the foreign material retention chamber is allowed on the partition plate. Foreign matter check valve is provided that does not allow the flow, that the upstream side of the foreign matter holding chamber and said inlet check valve is communicated by the communication passage has a main feature.
[0008]
In the apparatus of the present invention, in order to separate the foreign matter accumulated on the screen, first, the outlet on-off valve is closed to shut off the downstream flow path on the screen, and the drive device is operated to move the screen gently in the upstream direction. When the fluid gradually permeates through the screen, fills the bag chamber-like section sandwiched between the screen and the outlet opening / closing valve, and then turns around, the screen moves rapidly in the downstream direction. Because the on-off valve is closed, the fluid that filled the bag chamber-like compartment was ejected from the downstream side of the screen to the upstream side, and the foreign matter accumulated on the upstream side of the screen by the force of the self-injection To peel off.
[0009]
On the other hand, when the movement of the fluid around the diaphragm driven in conjunction with the screen is observed, when the diaphragm moves slowly in the upstream direction, the foreign matter check valve on the diaphragm is closed. Therefore, the fluid in the front side of the partition plate, that is, the foreign substance retention chamber, is pushed by the partition plate and gradually flows out to the inlet channel through the communication path, and the inlet channel on the back side of the partition plate, that is, the screen side. Fluid gradually enters the inlet check valve. When the diaphragm stops, the inlet check valve closes, and after that, when the diaphragm moves rapidly in the downstream direction, both the outlet on-off valve and the inlet check valve are closed. The fluid containing the separated foreign matter on the side pushes open the foreign matter check valve on the partition plate and flows into the foreign matter retention chamber. By this series of operations, the separated foreign matter on the upstream side of the screen can be reliably and sequentially sent into the foreign matter retention chamber without being re-adsorbed to the screen, and can be taken out from the foreign matter outlet at a desired time.
[0010]
  In the present invention, an auxiliary screen may be interposed in the communication path..
[0011]
  or,The outlet on / off valve is operated in conjunction with the drive shaft in the first part of the operation stroke in the upstream direction of the drive shaft to close the valve, and at the end of the operation stroke in the downstream direction of the drive shaft. The valve may be configured to open in conjunction with the drive shaft in a part of the section, and in a section that does not interfere with the operation of the drive shaft in other sections.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the same reference numerals are given to common parts throughout the drawings, and details of each embodiment of the present invention will be described.
FIG. 1 shows a first embodiment of the present invention, and the foreign material peeling method is illustrated based on the technical idea of the original invention. That is, the container body 1 a provided with the inlet channel a, the outlet channel d including the outlet opening / closing valve 14, and the foreign matter discharge port 15 is covered with the container lid 1 b to form the container 1. . In the container 1, an upright cylindrical partition wall member 2, one of which opens to the inlet flow path a and the foreign substance discharge port 15 and the other of which opens to the outlet flow path d, is fitted along the inner surface thereof. A screen 11 that slides in the flow direction (the vertical direction in the figure) is provided. The screen 11 is attached to the drive shaft 4 at the center thereof, and the drive shaft 4 is supported by the bearing 10 and is connected to the drive device 3 through the container lid 1b through the seal member 10s in a sealing manner.
[0013]
The driving device 3 is a mechanism that gently drives the screen 11 in the upstream direction (downward in the figure) and rapidly returns in the downstream direction (upward in the figure). A biasing force member 6 (for example, a coil spring) that is mounted between the biasing force receiving portion 4 a on the drive shaft 4 and the container 1 and constantly biases the drive shaft 4 in the downstream direction, and is connected to the drive shaft 4. As a representative example, the shape of the cam 5 is a snail-like shape. Then, the cam 5 that rotates (rotates in the clockwise direction in the drawing) with the rotation of the manual handle 5a causes the drive shaft 4 to gradually move upward with a force exceeding the urging force of the urging force member 6 in the downstream direction. The drive shaft 4 is allowed to suddenly operate in the downstream direction at the moment when the cam 5 is pushed in the direction and changes tomographically from the maximum diameter to the minimum diameter of the cam 5. In addition, it is desirable to attach a roller or the like for reducing sliding friction at the end of the drive shaft 4 that contacts the cam 5.
[0014]
Further, in the present invention, the inlet channel a is provided with an inlet check valve 13 that allows only a downstream flow and does not allow a reverse flow, and between the screen 11 and the foreign matter discharge port 15, the inner surface of the container 1. A diaphragm 16 is provided which slides along. The partition plate 16 is attached to the drive shaft 4 at the center thereof, and moves forward and backward in conjunction with the screen 11, and a foreign material retention chamber is provided between the partition plate 16 and the foreign material discharge port 15. f is formed. The partition plate 16 is provided with a foreign substance passage hole 16a, and further, a foreign substance check valve 16b that opens and closes the foreign substance passage hole 16a and allows only a flow from the upstream side of the screen 11 toward the foreign substance retention chamber f and does not allow a reverse flow. It has been. The foreign matter check valve 16b is always biased in the closing direction. In this embodiment, the foreign body check valve 16b is easily biased in the closing direction by using an elastic member (for example, a rubber plate) for the valve body itself. Illustrated. The foreign substance retention chamber f communicates with the inlet flow path a upstream of the inlet check valve 13 through the communication path 17, and a small auxiliary screen 18 is interposed in the communication path 17.
[0015]
The mode of operation of the filtration device having the above-described configuration is as follows.
In the normal filtration process of the present apparatus, the outlet opening / closing valve 14 is opened, so that the fluid flows in from the inlet flow path a by pushing the inlet check valve 13 open, and flows in front of the screen flow path b → screen 11 → After passing through the screen c to the outlet channel d through the outlet opening / closing valve 14, foreign matter accumulates on the upstream surface of the screen 11.
When this foreign matter needs to be discharged, first, the outlet on-off valve 14 is closed to shut off the flow path on the downstream side of the screen 11. As a result, a bag chamber-like section of fluid sandwiched between a wall having a gentle sealing property called a screen and a wall having a strict sealing property called an outlet on / off valve is born.
[0016]
Next, when the driving device 3 is operated, the screen 11 moves slowly in the upstream direction (downward in the figure) and rapidly in the downstream direction (upward in the figure). When the movement of the fluid occurring along with this is observed, when the screen 11 moves slowly in the upstream direction, the fluid flows from the upstream side of the screen 11 so as to fill the volume difference between the upstream side and the downstream side of the screen 11. When the screen 11 is gradually permeated downstream to fill the bag chamber-shaped section, and then the screen 11 moves rapidly in the downstream direction, the fluid filling the bag chamber-shaped section opens and closes the outlet. Since the valve 14 is closed and there is no other escape area, foreign matter that has been ejected from the downstream side of the screen 11 to the upstream side at once, and accumulated on the upstream side surface of the screen 11 from the screen 11 by the force of the self-injection. Blow off and peel. The driving of the screen 11 may be repeated as appropriate.
[0017]
On the other hand, when the movement of the fluid around the partition plate 16 driven in conjunction with the screen 11 is observed, when the partition plate 16 moves slowly in the upstream direction (downward in the figure), The foreign matter check valve 16b is closed, so that the fluid in the front side of the partition plate 16, that is, the fluid in the foreign matter retention chamber f is gradually pushed by the partition plate 16 and is filtered by the auxiliary screen 18 while being connected to the communication passage 17. The foreign matter that has flowed out into the inlet flow path a through the auxiliary screen 18 and stays in the foreign matter retention chamber f. On the back side of the partition plate 16, that is, on the screen 11 side, the fluid in the inlet channel a gradually flows in by opening the inlet check valve 13 so as to fill the volume displaced by the partition plate 16. And when the advancement of the diaphragm 16 stops, the inlet check valve 13 is closed. Thereafter, when the plate 16 turns and rapidly moves in the downstream direction (upward in the figure), the fluid containing the separation foreign matter on the upstream side of the screen 11 closes both the outlet on-off valve 14 and the inlet check valve 13. Since there is no other escape, the foreign matter check valve 16b on the partition plate 16 is pushed open and flows into the foreign matter retention chamber f. By appropriately repeating the driving of the partition plate 16, the separated foreign matter on the upstream side of the screen 11 is reliably and sequentially sent into the foreign matter retention chamber f together with the surrounding fluid without being re-adsorbed to the screen 11, The fluid contained therein returns to the inlet channel a through the communication passage 17 and only foreign matter blocked by the auxiliary screen 18 accumulates in the foreign matter retention chamber f.
[0018]
The foreign matter collected and accumulated in the foreign matter retention chamber f can be discharged by opening the foreign matter discharge port 15 at an appropriate time desired by the user regardless of the operation timing of the driving device 3. It goes without saying that the discharge pressure from the foreign matter discharge port 15 can be increased by narrowing the outlet on-off valve 14 during this discharge, and the discharge pressure from the foreign matter discharge port 15 can be kept low by opening the outlet on-off valve 14. Yes.
After the discharge of foreign matter is completed, the foreign matter discharge port 15 may be closed again, and the apparatus can be filtered by opening the outlet opening / closing valve 14 regardless of whether the foreign matter is discharged. Continue the journey.
[0019]
With respect to the auxiliary screen 18, the speed at which the fluid in the foreign material retention chamber f is pushed by the partition plate 16 and passes through the auxiliary screen 18 is very slow. In addition, when the foreign matter discharge port 15 is opened, a part of the fluid in the inlet channel a flows in the direction of the communication path 17 → the foreign matter retention chamber f → the foreign matter discharge port 15 and the auxiliary screen 18 is automatically reversed. Since it is washed, there is almost no need to clean the auxiliary screen 18. Of course, it is more preferable that the auxiliary screen 18 is formed so as to be easily cleaned and replaced. If the target foreign matter has a heavy specific gravity, it inevitably settles at the bottom of the foreign matter retention chamber f, so an auxiliary screen 18 for filtration is provided in the communication passage 17. Although not necessary, as an application example aiming at more perfect performance, an auxiliary screen 18 is illustrated.
[0020]
FIG. 2 shows a second embodiment of the present invention, in which the urging force member 6 provided for urging the drive shaft 4 in the downstream direction in the drive device 3 of the first embodiment is removed. The piston / cylinder mechanism 7; 8 is replaced. That is, the configuration of the drive device 3 includes a cam 5 connected to the drive shaft 4, a piston 7 attached to the drive shaft 4, and a cylinder 8 that hermetically accommodates the piston 7 via a seal member 7s. Yes. Of the two chambers facing each other with the piston 7 sliding inside the cylinder 8, the pressure chamber 8m on the side pushing the drive shaft 4 in the downstream direction is communicated with the inlet channel a by the communication passage 9, and the chamber on the opposite side. 8n communicates with the atmosphere. With this configuration, the pressure in the pressure chamber 8m (that is, the pressure in the inlet channel a) overcomes the pressure in the chamber 8n (that is, atmospheric pressure) and always urges the drive shaft 4 in the downstream direction. This is the same function as the biasing force member 6 in FIG. Although the chamber 8n is communicated with the atmosphere in the illustrated example, the chamber 8n may communicate with a negative pressure instead of the atmosphere in order to enhance the biasing effect.
Since other configurations and operations are the same as those of the first embodiment, detailed description thereof is omitted.
[0021]
FIG. 3 shows a third embodiment of the present invention, in which the screen 11 and the partition plate 16 of the first embodiment are integrally formed, the flow path is also arranged, and a more compact configuration is achieved. It is a thing. As for the drive device 3, as an example of the quick return mechanism, a method of operating the ratchet 5 having the same function as the cam by the lever 5 b is illustrated. That is, when the lever 5b at the position of the solid line in the figure is rotated in the clockwise direction in the figure, one end of the lever 5b is engaged with the claw-like ratchet 5 loosely attached on the drive shaft 4, The drive shaft 4 is gently driven in the upstream direction (downward in the figure), and after a predetermined interval, the engagement is disengaged, and the biasing force member 6 moves the drive shaft 4 in the downstream direction (upward in the figure). Drive back quickly. Then, the lever 5b is rotated counterclockwise, so that one end of the lever 5b gets over the ratchet 5 on the drive shaft 4 and can be engaged again. It is desirable to attach a roller or the like for reducing sliding friction to the end of the lever 5b that engages with the ratchet 5. In addition, 10m is a rotation stop of the drive shaft 4 for making the ratchet 5 engage stably.
Since other configurations and operations are the same as those of the first embodiment, detailed description thereof is omitted.
[0022]
FIG. 4 shows a fourth embodiment of the present invention. The operation of the outlet on / off valve 14 of the third embodiment is linked with the operation of the drive shaft 4 to separately open and close the outlet on / off valve 14. This saves time and makes the device more compact.
In other words, the outlet opening / closing valve 14 is operated in conjunction with the drive shaft 4 in the first partial section of the operation stroke in the upstream direction of the drive shaft 4, and is closed in the operation direction in the downstream direction of the drive shaft 4. The valve is operated in conjunction with the drive shaft 4 in a part of the end and opens, and in other sections, the structure does not interfere with the operation of the drive shaft 4.
[0023]
Specifically, the valve seat 14b of the outlet on / off valve 14 is provided concentrically with the drive shaft 4 in the container 1, and a valve body 14a for opening and closing the valve seat 14b is provided on the downstream side of the valve seat 14b. The peripheral portion of the valve body 14a is slidably fitted into the container 1 via a seal member 14s to form a bag chamber g between the valve body 14a and the center portion thereof is slidable on the drive shaft 4. It is assumed that the movement range is regulated by the stopper 4b on the drive shaft 4 so as to be smaller than the movement range of the drive shaft 4. Further, in order to reduce the force required to open and close the valve body 14a, a communication hole 14c is formed as appropriate so that the pressure on the front surface (upstream side) and the back surface (bag chamber g) of the valve body 14a is always equal. ing.
The urging force member 6 that urges the drive shaft 4 in the downstream direction is provided between the urging force receiving portion 4a and the valve body 14a, instead of being provided between the urging force receiving portion 4a and the container 1. That is, the urging force member 6 urges the drive shaft 4 in the downstream direction and simultaneously urges the valve body 14a in the upstream direction until it hits the stopper 4b. Further, the drive shaft 4 is urged in the downstream direction by an urging force member 14f having a weaker force than the urging force member 6.
[0024]
In this fourth embodiment, when the lever 5b located at the position of the solid line in the drawing is rotated in the clockwise direction in order to operate the driving device 3, as the driving shaft 4 moves in the upstream direction. The outlet opening / closing valve body 14a abutted against the stopper 4b by the biasing force member 6 also moves in the upstream direction, and eventually comes into contact with the valve seat 14b to close the valve. The movement of the valve body 14a stops here, but the drive shaft 4 (and the stopper 4b, the screen 11 and the partition plate 16 fixed thereto) continue to move further in the upstream direction, and the biasing force member 6 and the biasing force member The urging force of 14f is compressed and accumulated.
[0025]
Next, at the moment when the engagement of the ratchet 5 of the drive device 3 is disengaged, the drive shaft 4 is rapidly driven back in the downstream direction by the force of the biasing force member 6 and the biasing force member 14f. At this moment, the outlet on / off valve body 14a is strongly pressed against the valve seat 14b by the force of the urging force member 6, and the outlet on / off valve 14 is maintained in a tightly closed state. Similarly, it is possible to cause foreign matter separation and foreign matter accumulation by powerful self-injection. When the drive shaft 4 continues to move in the downstream direction, the stopper 4b eventually comes into contact with the valve body 14a. From this point of time, the urging force of the urging force member 6 is confined between the urging force receiving portion 4a and the stopper 4b and does not exert an acting force to the outside, but the drive shaft 4 is directed downstream by the urging force of the remaining urging force member 14f. The stopper 4b pushes and opens the valve body 14a, and the outlet on-off valve 14 returns to the valve open state. Thereafter, the lever 5b is rotated counterclockwise, the ratchet 5 is engaged again, and the driving device 3 is operated repeatedly.
[0026]
Due to the above-described mechanism, the fourth embodiment has a powerful foreign material separation / blocking mechanism by closing the downstream fluid escape area when the screen 11 and the partition plate 16 are rapidly driven back in the downstream direction. The original purpose of the outlet opening / closing valve 14 to allow the accumulation to be performed can be sufficiently achieved, and the period during which the outlet opening / closing valve 14 is closed is a period that is truly required, that is, the drive shaft 4 is rapidly moved in the downstream direction. Therefore, the flow of filtration is not blocked unnecessarily, and the operating force source of the outlet on / off valve 14 uses the power source of the driving device 3, which is economical. And has many advantages of being easy to operate. Of course, the same action as in this embodiment can be obtained even if the outlet opening / closing valve 14 is mechanically and electrically linked to the drive device 3 while being arranged at the same position as in the first to third embodiments. However, in the present embodiment, as the most compact and compact design example, the outlet on / off valve 14 arranged around the drive shaft 4 is shown.
[0027]
In the fourth embodiment, the foreign matter check valve 16b attached to the partition plate 16 is closed by the biasing force member 16f instead of using an elastic member as in the first to third embodiments. It is also exemplified that an appropriate number of swing type check valves urged to the position may be provided.
Since other configurations and operations are the same as those of the third embodiment, detailed description thereof is omitted.
[0028]
FIG. 5 shows a fifth embodiment of the present invention, in which the drive device 3 of the fourth embodiment is replaced with a form in which the handle 5a is continuously rotated from a form in which the lever is reciprocated. . In particular, there is illustrated an example in which a plurality of engagement (roller) portions with the ratchet 5 are provided on the rotating plate to reduce the play section during rotation of the handle. Further, with respect to the foreign matter check valve 16b attached to the partition plate 16, instead of using the swing type check valve as in the fourth embodiment, the lift type check valve 16b is urged in the closing direction by the urging force member 16f. It is also illustrated that a check valve may be provided.
Since other configurations and operations are the same as those of the fourth embodiment, detailed description thereof is omitted.
[0029]
Now, in the apparatus of the present invention, it is possible to automate by attaching appropriate actuators to the parts (the driving device 3, the outlet on / off valve 14, and the foreign matter discharge port 15) operated from the outside. It is also possible to perform an unattended operation to automatically remove clogged foreign substances, collect them, return to the filtration process, and discharge foreign substances by automatic sequence control of the operation procedure.
[0030]
FIG. 6 shows a sixth embodiment in which unmanned operation is achieved. That is, a differential pressure detection device 20 that detects that the differential pressure before and after the screen 11 has reached a predetermined value due to an increase in flow resistance accompanying the accumulation of foreign matter on the screen 11 is provided, or illustration is omitted, A position detection device that detects the change in the position of the screen 11 due to the differential pressure is provided (all detection devices are well-known and will not be described in detail), and a sequence control function is added. In this example, the actuator 3d of the driving device 3 and the actuator 15d of the foreign matter discharge port 15 are sequentially operated to perform automatic sequence control.
In the automatic sequence, for example, the drive device 3 is activated based on a detection signal of the differential pressure across the screen 11 generated by the accumulation of foreign matter on the screen 11, and the foreign matter is peeled and collected, and then the filtration process. The foreign matter discharge port 15 is opened at a predetermined timing and the accumulated foreign matter is discharged, and can be appropriately set according to the use conditions at the facility site. In the first to third embodiments in which the outlet opening / closing valve 14 is provided independently of the driving device 3, an actuator may be attached to the outlet opening / closing valve 14 to be included in the automatic sequence control.
[0031]
In the sixth embodiment, when the foreign matter check valve 16b attached to the partition plate 16 is a lift type check valve, the container 1 receives one end of the biasing force member 16f in the closing direction. Thus, the urging force member 14f, which was necessary in the fifth embodiment, can be omitted.
In the sixth embodiment, an embodiment of the foreign material scraping member 19 is also illustrated. That is, a scraping member 19 is attached to the container 1 at a location that does not hinder the operation of the screen 11, and is in sliding contact with the surface of the screen 11. The scraping member 19 may have various shapes such as a plate shape, a nail shape, and a brush shape depending on the nature of the foreign matter to be scraped or the properties of the screen 11 (whether it is a mesh, a perforated plate or a slit plate). It is done. Regarding the structure of the scraping member 19, in addition to the above, it may be formed so as to move around using fluid pressure or the like, or a spray by a pump or the like may be used together. Of course, a scraping member may be attached to the auxiliary screen 18 as well.
It is also exemplified that the opening / closing valve 21 for communicating with the outside may be provided in the bag chamber g. By opening the normally closed on-off valve 21, the gas accumulated in the apparatus can be removed, and in the unlikely event that the outlet on-off valve 14 becomes difficult to open due to adhesion of a scale or the like, this on-off valve If the bag chamber g is opened to the atmosphere by opening 21, the valve can be forcibly opened by the differential pressure across the outlet opening / closing valve 14.
Since other structures and operations are the same as those of the fifth embodiment, detailed description thereof is omitted.
[0032]
As described above, the filtration device of the present invention produces an epoch-making action and effect. However, in accordance with the gist of the present invention, various structural changes are made and the prior art is used to meet the practical requirements. It is possible to respond.
For example, as for the outlet on / off valve 14, for convenience, FIGS. 1 and 2 show a butterfly valve type, and FIGS. 4 to 6 show a lift valve type. Of course, any type of gate valve, globe valve, ball valve, etc. may be selected as appropriate. Similarly, various types of valves can be applied to the foreign matter discharge port 15. Further, the inlet check valve 13 may be appropriately selected such as a lift type in addition to the swing type shown in FIGS. As for the biasing force member 6, in addition to the method using an elastic member such as a spring as shown in FIGS. 1 and 3 to 6, for example, linking to a weight, adding a booster mechanism, Of course, application of a hydraulic device or the like can be easily performed.
[0033]
The screen may be single as shown in FIGS. 3 to 6, but it is of course possible to arrange the screens in multiple layers. In FIGS. 1 to 2, a coarser screen 12 is provided upstream of the screen 11. An example of arrangement is shown. The foreign matter peeled off from the screen 11 by the above-mentioned self-injection action passes through the coarse screen 12 as it is due to gravity or the like, and is sent into the foreign matter retention chamber f together with the coarse foreign matter peeled off from the coarse screen 12 by the influence of the self-injection action. The coarse screen 12 may be fixedly attached to the inside of the container 1 as shown in FIGS. 1 to 2, or may be mounted on the drive shaft 4 and made movable like the screen 11.
As for the material of the screens 11 and 12, metals, synthetic resins, synthetic fibers, and other various materials can be applied. In addition, if the material has a slight elasticity, it is desirable because the mesh is slightly enlarged during the operation of the self-injection and the foreign matter sandwiched between them is easy to peel off. It may be selected in consideration of the balance with the required strength. Similarly, an appropriate material can be selected for the auxiliary screen 18.
[0034]
With respect to the installation direction of the present filtration device, in each drawing, the drive shaft 4 is arranged in the vertical direction, but the present invention is not limited to this, and it may be installed in an appropriate direction other than the horizontal direction.
About the flow path shape of the container 1, the inflow path from the inlet flow path a may be provided in a tangential direction with respect to the inner wall of the container 1, and the fluid may flow in a cyclone shape from the inlet flow path a. The partition member 2 may be formed integrally with the container body 1a depending on the material of the container body 1a.
[0035]
As for the method for discharging foreign matter from the foreign matter discharge port 15, if it is necessary to push up and discharge the foreign matter, in addition to the known mechanical feeding method (bucket or conveyor method) or pump feeding method, etc. There is also a method of feeding by using the water amount and pressure of the inlet channel a of the present filtration device as they are. In that case, the height to which the foreign matter can be pushed up is determined by the pipe conditions such as the amount of water and pressure of the inlet channel a. An installation method is also possible in which the discharge pipe from the foreign substance discharge port 15 is lifted and placed on the ground surface. On the other hand, when the amount of water or the pressure is excessive, an on-off valve may be additionally installed on the upstream side of the present filtration device, and the opening degree may be adjusted to moderately suppress the foreign matter discharge.
In addition, various design changes can be made within the scope of the gist of the present invention, such as the positional relationship of each member, and the present invention is not limited to the above-described embodiments.
[0036]
【The invention's effect】
As described above, the present invention drastically solves the technical problem of clogging separation and discharge processing in the conventional filtration device, and is easy to design and manufacture, and is clogged by manual operation or automatic operation by an actuator. A high-performance and convenient filtration device that not only can easily remove the foreign matter but also collects and accumulates the foreign matter once peeled off without re-adsorbing it to the screen, and makes it easier to discharge the foreign matter. The results are excellent, and it is possible to achieve excellent results in maintenance management, and the remarkable effect of the implementation is much greater than that of the prior art.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention, showing a state where a screen has finished moving in a downstream direction.
FIG. 2 is a longitudinal sectional view of a second embodiment of the present invention, showing a state in which the screen has finished moving in the downstream direction.
FIG. 3 is a longitudinal sectional view of a third embodiment of the present invention, showing a state in which the screen has finished moving in the downstream direction.
FIG. 4 is a longitudinal sectional view of a fourth embodiment of the present invention, showing a state where the screen has finished moving in the downstream direction.
FIG. 5 is a longitudinal sectional view of a fifth embodiment of the present invention, showing a state in which the screen has finished moving in the downstream direction.
FIG. 6 is a longitudinal sectional view of a sixth embodiment of the present invention, showing a state where the screen has finished moving in the downstream direction.
FIG. 7 is a longitudinal sectional view showing an example of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container 1a ... Container main body 1b ... Container lid 2 ... Partition member
3 ... Drive device 3d ... Actuator
4 ... Drive shaft 4a ... Biasing force receiving portion 4b ... Stopper
5 ... Cam, ratchet 5a ... Handle 5b ... Lever
6 ... Biasing force member
7 ... Piston 7s ... Seal member
8 ... Cylinder 8m ... Pressure chamber 8n ... Chamber 9 ... Communication passage
10 ... Bearing 10m ... Anti-rotation 10s ... Sealing member
11 ... Screen 12 ... Coarse screen
13 ... Inlet check valve
14 ... Outlet on / off valve 14a ... Outlet on / off valve body 14b ... Outlet on / off valve valve seat
14c ... Communication hole 14f ... Biasing force member 14s ... Seal member
15 ... Foreign matter outlet 15d ... Actuator
16 ... Separator plate 16a ... Foreign matter passage hole 16b ... Foreign matter check valve
16f ... biasing force member
17 ... Communication passage 18 ... Auxiliary screen 19 ... Scraping member
20 ... Detection / control device 21 ... Open / close valve 23 ... Inlet open / close valve
a ... Inlet channel b ... Screen front channel c ... Screen rear channel
d ... Outlet channel f ... Foreign matter retention chamber g ... Bag chamber

Claims (3)

An upstream inlet channel, a downstream outlet channel, a screen extending between the two channels and sliding in the flow direction along the inner surface of the container; and upstream of the screen In the filtration device provided with a foreign matter discharge port on the side, the screen is driven slowly in the upstream direction and rapidly in the downstream direction by the drive device via the drive shaft.
The inlet channel is provided with an inlet check valve that allows only a downstream flow and does not allow a reverse flow, the outlet channel is provided with an outlet opening / closing valve, and the outlet and the foreign matter discharge port are provided with the outlet check valve. A partition plate that slides along the inner surface of the container in conjunction with the screen is provided, and a foreign material retention chamber is formed between the partition plate and the foreign material discharge port. A filtration device comprising a foreign matter check valve that allows only a flow toward a foreign matter retention chamber and does not allow a reverse flow, and the foreign matter retention chamber communicates with an upstream side of the inlet check valve through a communication passage.   The filtration device according to claim 1, wherein an auxiliary screen is interposed in the communication path. The outlet on / off valve is operated in conjunction with the drive shaft in the first part of the operation stroke in the upstream direction of the drive shaft to close the valve, and at the end of the operation stroke in the downstream direction of the drive shaft. The filtration according to claim 1 or 2, characterized in that the valve is opened by operating in conjunction with the drive shaft in some sections, and does not interfere with the operation of the drive shaft in other sections. apparatus.

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