JPH01164409A - Purifying device - Google Patents

Abstract

PURPOSE:To provide a purifying device dispensed with maintenance by installing backwashing nozzles which eject washing liquid during rotation to the inside of the purifying device having a filtration ports comprising many slits to the peripheral surface of a cylindrical body. CONSTITUTION:A cylindrical, tapering off tank 16 is installed to a purifying device 1 constituting a painting line for car bodies. An introducing port 18 of treating liquid is provided to the top end of the tank 16, and suspended matters such as thread pieces are made easily floatable by swirling the introduced treating liquid along the internal periphery of the tank 16 by a swirl baffle plate 19. A second cylindrical screen 35 having many filtration ports 36 is provided to the center of the tank 16. The treated liquid is discharged through a discharging pipe 39 after passing through the filtration ports 36. Further, backwashing nozzles are attached freely rotatably to the inside of the screen 35, permitting periodical backwashing of dusts sticking to the external peripheral surface of the screen.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a purification device.

[Background technology]

For example, a car body painting line is equipped with a surface treatment process as a pre-process for the main painting process, such as removing welding debris adhering to the car body surface, improving the corrosion resistance of the car body surface, and improving the adhesion of paint during the main painting process. The aim is to improve the properties and electrodepositability of the coating. Therefore, in the surface treatment step, for example, a degreasing step using a surfactant and an alkali builder, a first washing step, a chemical conversion step using zinc phosphate, etc., a second washing step, etc. are sequentially performed. .

In these processes, for example, the degreasing process, risers equipped with a large number of shower nozzles are arranged in a row in the line direction surrounding the object to be treated, which is the car body, and the water is sent through these risers. Processing liquid (fluid)
is sprayed onto the car body surface through a nozzle to degrease it.

The processing liquid used for this purpose is collected in a degreasing tank, and guided again from the riser to the nozzle by a circulation pump to be used for degreasing. A variety of miscellaneous objects are mixed in, from large foreign objects to fine foreign objects such as thread waste, cotton waste, welding spuds, and iron powder. These foreign substances need to be removed before the circulation pump.

In order to remove these foreign substances, a 2riA mesh screen was installed inside the degreasing tank, but conventionally,
These mesh screens were used to remove all of the foreign substances, from large ones to small ones. Therefore, wire mesh with a fine mesh of 8 to 10 meshes was normally used as the mesh screen, but even though it was made of two layers, these screens alone could not effectively trap foreign objects. The problem was that many of the nozzles clogged prematurely. Since the screen has a fine mesh, minute objects such as thread waste and cotton waste can easily become entangled in the mesh, and once these become entangled, they cannot be removed as they are. There was also the inconvenience that it clogged rapidly. As a result, in the past, these screens had to be replaced with new ones every 3 to 4 hours, and in between, the removed screens had to be manually cleaned, which was a very troublesome task. However, it goes without saying that if the mesh size of the screen is increased, the nozzle will quickly become clogged. Since the screen is a wire mesh,
In some cases, the pressure and flow rate caused the eyes to open, reducing filtration accuracy.

[Purpose of the invention]

In view of the above circumstances, an object of the present invention is to provide a purification device that can perform effective filtration and eliminate the need for maintenance.

[Disclosure of the invention]

To achieve the above object, the present invention provides a tank having an inlet for a fluid to be purified and an outlet for extracting foreign matter removed from the fluid, and a cylindrical body disposed within the tank. The tank has a large number of filtration ports on its circumferential surface, and its internal space communicates with the external space in the tank only through these filtration ports, and also has a discharge port for taking out the fluid after filtration. In the purification device equipped with a screen, the tank has at least a lower part thereof tapered downward and has an outlet for extracting the foreign matter at the lower end, and the screen has a filtration opening with a slit. It is formed into a shape, and inside it,
The purification device is characterized in that it is equipped with a backwash nozzle that injects a cleaning liquid toward the filtration port while rotating relative to the screen about its central axis.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

FIG. 1 shows a cross-section of an embodiment of the purifying device 1 according to the present invention, viewed diagonally from above, and FIG. 2 shows the same device 1.
The flow sheet shows how this is incorporated into the surface treatment process. In this embodiment, this purification device 1 includes:
It is incorporated into the degreasing system in the surface treatment process. This degreasing system is equipped with a booth 2 located on the painting line, and the car bodies flow in the direction of the arrow. This booth 2 has risers 3 surrounding the vehicle body arranged in a row in the direction of the arrow, and a large number of shower nozzles (not shown) are provided on the side of each riser 3 facing the vehicle body. A receiver 4 is installed on the lower side of the booth 2 to collect the processing liquid (fluid) and guide it to the degreasing tank 5. The degreasing tank 5 is configured to temporarily store the processing liquid to promote settling of foreign substances mixed in the processing liquid, and to remove other foreign substances using the first screen 6. The first screen 6 is formed of a wire gauze with a relatively coarse mesh of one or more meshes, and allows fine foreign matter to pass therethrough. That is,
This fine foreign matter is left to the purification device 1 to remove. The outlet of the degreasing tank 5 and the riser 3 are connected to the circulation pump 7 and the first. It is connected by a first pipe 1) with second valves 8, 9 and a pressure gauge 10. The pump 7 has an inlet pressure of 3 kg/cnl and a flow rate of 30007! /min. Circulation pump 7
A third valve 12 and a pressure gauge 13 are connected between the outlet side and the purifier 1.
During normal operation, the processing liquid (fluid) is not directly returned to the riser 3 from the degreasing tank 5, but is supplied to the purifier 1 through the second pipe 14.

The purification device 1 includes a tank 16 whose upper end opening is closed with a removable top lid 15. This tank 16 has a cylindrical upper part and a tapered lower part tapered downward, and a part of this taper is used as a residue collecting part 17. A treatment liquid inlet 18 for receiving the treatment liquid from the second pipe 14 is provided at the upper end of the tank 16, and this inlet 1
A circulating control plate 19 is disposed on the inside of the tank 8 and has an approximately L-shape when viewed from above and whose tip is parallel to the inner circumferential surface of the tank. Circulating it makes it easier for thread waste, cotton waste, etc. to float. Floating and circulating debris is introduced together with the processing liquid into a saucer 21 with a socket 20 facing a little lower than the liquid level, and then transferred to a third pipe equipped with a fifth valve 23 by a feed pump 22. 24 and guided to a paper filter 28 through a fourth pipe 27 equipped with an eighth valve 25 and a pressure gauge 26. The processing liquid after being filtered by the filter 28 is returned into the receiver 4 through the fifth pipe 29. The sludge such as the weld layer that settles in the tank 16 is collected by the residue collecting part 17 into the extraction port 30 provided at the lower end of the tank 17, and then, together with a part of the processing liquid, the sludge is collected in a sixth valve equipped with a sixth valve 31. It is sucked out by the feed pump 22 through the pipe 32, and passed through the fourth pipe 27 to the paper filter 28.
sent to. A seventh valve 33, which is a drain valve, is attached to the extraction port 30, and is closed during normal operation, and is temporarily opened to perform a drain function before backwashing, which will be described later. The drain port 34 is provided on the outlet side of the valve 33. The tank 16 is provided with a cylindrical second screen 35 at the center thereof. This second screen 35 is made of punched metal having a cylindrical shape with a large number of filtration holes 36 formed therethrough, and its upper end opening is connected to the upper lid 1.
5, and is fixed in the tank 16 with its axis shaped like a vertical axis. As shown in the enlarged view of FIG. 3, each of the filtration holes 36 is formed in the shape of a slit with a width W of 1 mm and a length of 25 mm. , parallel to each other in a staggered arrangement. The arrangement is regular with a pitch P between widths of 2 and a distance S between longitudinal ends of 1. The width W of the slit-like filtration opening is 0.5 to 3 mm, and the length is 15 to 4 mm.
Preferable tolerance ranges are 0 length, width pitch P of 1.5 to 3 lengths, and longitudinal end spacing S of 0.5 to 3 lengths. Each filtration port 36 is oriented horizontally in its longitudinal direction in this embodiment. The bottom of the second screen 35 is closed with a bottom plate 37, and the bottom plate 37 is approximately at the same level as the north end of the residue collecting section 17. The interior space of the second screen 35 is thus divided into the filtration openings 36...
It communicates with its external space in the tank 16 only through it. In the second screen, the filtration port 36...
The filtered processing liquid that has passed through is led out through a lead-out pipe 39 that communicates through a filtrate outlet 38 that is a central opening of the bottom plate 37, and this lead-out pipe 39 is configured to be taken out to the outside of the tank 16. It is provided.

A seventh pipe (return pipe) 43 equipped with a pressure gauge 40, a flow meter 41, and a fourth valve 42 is connected between the outlet pipe 39 and the first pipe 1). is designed to lead to riser 3... The second screen 35 is backwashed from the inside, and means for backwashing is a backwash nozzle 44.
...However, this embodiment further includes a scraper 45. The backwashing nozzle 44 is arranged apart from the outside of the support shaft 46, and the support shaft 46 is made of a hollow pipe and protrudes long into the center of the tank 16 through the upper lid 15. The support shaft 46 is rotatably supported by a bearing 47 attached to the upper lid 15, and a drive gear 50 of a variable speed machine 49 meshes with a driven gear 48 attached to the upper end of the support shaft 46, so that the support shaft 46 is rotated. 46 is adapted to be rotationally driven.

On the outer periphery of the support shaft 46, four rows of conduction pipes 51 are attached horizontally and in communication with each other, with a phase difference of 180 degrees when viewed from above. Conduction pipe 51 in each row
... are arranged in one row with a certain interval between the top and bottom, and the conduction pipes 51 ... in one row and the vibrators 51 ... in the other row are different from each other when viewed from the side. They are arranged in a staggered manner. A backwashing nozzle 44 is attached to the tip of each conduction pipe 51 via a flange 52, and the ejection hole 53 of this nozzle 44 has a width of one dragon, as shown in FIGS. 4 and 5. , the length (height) B is a long hole shape of 25 dragons. Each of the ejection holes 53 of the backwash nozzle 44 is shaped like an In and is spaced a distance C from the inner surface of the second screen 35.
are arranged at a distance of 15 mm At1, and the injection angle α is 30 degrees in both the upper and lower directions so that the cleaning liquids partially overlap each other.

The cleaning liquid for backwashing is supplied to the eighth pipe branched from the seventh pipe 43.
It is guided through piping 54. The eighth pipe 54 is provided with a first valve 55, a pressure pump 56, a twelfth valve 57, and a pressure gauge 58, and the pipe 54 and the support shaft 46 are connected to a flexible shaft 59 and a rotary joint. 60. A scraper 45 having a soft brush 61 at its tip protrudes radially from the outer circumference of the support shaft 46 . This scraper 45 rotates 90 degrees ahead of one of the two rows of backwash nozzles 44 in the circumferential direction, and the brush 61 at the tip rotates while scraping the inner peripheral surface of the second screen 35. This removes dirt and the like that are clogged in the filtration ports 36 and makes backwashing by the backwashing nozzle 44 effective. Note that the ninth valve 62 on the eighth pipe 54 and the first
) A ninth pipe 64 having a tenth valve 63 is connected between the valves 55, and the first O valve 63 is closed during normal backwashing, that is, when backwashing is performed using filtered processing liquid. However, when makeup water is required, it is opened with the closing operation of the ninth pulp 62, and the ninth pipe 64 is opened.
By guiding the industrial water supplied through the eighth pipe 54 into the support shaft 46 and spouting this industrial water from the backwashing nozzle 44..., backwashing can be performed in addition to replenishment. It has become. The upper lid 15 of the tank 16 is provided with an air vent 66 which is connected to the thirteenth valve 65, and is opened simultaneously with the opening of the seventh valve 33.

Normal operation is the second. 7th. 10th. 13th each valve 9,
33, 63.65 are fully closed, and the 8th valve 25 is 1/4
At the same time, the other valves are kept fully open. As a result, the used processing liquid (degreasing liquid) in the booth 2 passes through the receiver 4 and is stored in the degreasing tank 5, and after undergoing the first stage of filtration by the first screen 6, it is transferred to the first piping by the circulation pump 7. 1) to the second pipe 14. The first screen 6 removes relatively large foreign matter, but the purifying device 1 processes fine foreign matter. The processing liquid fed to the second pipe 14 is passed through the inlet 18
is introduced into the tank 16 through. At this time, since the processing liquid is circulated by the circulation control plate 19, thread waste, cotton waste, etc. are easily suspended, and the floating substances received by the feed pump 22 through the receiving tray 21 are transferred to the paper filter 2.
8 and processed by the same filter 28.

Note that the filter 28 is provided with a limit switch 67 for checking the throughput. The processing liquid guided to circulate in the tank 16 continues to circulate and descends, and items with high specific gravity such as welding spuds and chips are smoothly collected by the residue collecting section 17 and sent to the feed pump 22. is processed by a paper filter 28. The processing liquid is filtered by the second screen 35 while circulating. This filtration is performed by foreign matter being caught in a large number of filtration ports 36 . . . , and these foreign matter are those that were not guided to the receiving tray 21 during the circulation, and those that were not guided to the receiving tray 21 due to the circulation, and those that naturally settled and were guided into the residue gathering part 17. These include things that were not done. Among these foreign objects, there are many that are very easy to get tangled and cause clogging, such as thread waste and cotton waste. There is a filtration hole 36 in the plate material.
Since it is made into a cylindrical body by opening it up, there is no chance of it becoming entangled. In other words, if the screen is made of netting material as in the past, lint or the like can get stuck in the intersecting parts of the weaving, or these lint can get tangled around the single wires of the netting material. According to the second screen 35, this does not occur, and the water simply remains in a natural state.As a result, the backwashing liquid (processing liquid) is sprayed from the backwashing nozzles 44... Then, the residue (foreign matter) is relatively easily removed from the filtration port 36, and the light ones float and are processed by the paper filter 28, and the heavy ones settle and pass through the tray 21. The backwashing nozzle 44 is treated along a route passing through the route and the residue collection section 17. In this embodiment, the backwashing nozzle 44 has an elongated opening and ejects light in the vicinity of the filtering port 36. Since the spray showers overlap each other, these backwashing effects are distributed to all the filtration ports 36.Residues accumulated in the filtration ports 36 are removed in advance by the brush 61. Since it is floated from the second screen 35, the above-mentioned backwashing effect becomes more effective.The filtered processing liquid is supplied to the booth 2 following the seventh pipe 43 and the first pipe 1). In addition, during operation, if the pressure gauge 13 on the inlet side of the purifier 1 rises above the set pressure due to clogging of the screen, the circulation pump 7 is automatically stopped and a buzzer sounds. In this case, the first screen 6 may be
In addition to replacing it with an 8-mesh one, the pressure pump 5
6. Stop all feed pumps 22 and variable speed gear 49, and turn off the 3rd. The fourth valve 12.42 is fully closed, the second valve 9 is fully opened, and the circulation pump 7 is driven. This makes it possible to switch to the conventional circulation system and deal with pressure abnormalities. At this time, by backwashing separately, it is possible to easily return to normal operation. During this backwashing, the seventh valve 33 is opened and the treated liquid in the septic tank 16 is converted into oil cans and about three cans are drained. The thirteenth valve 65 is left fully open. Therefore, the variable speed machine 49 and the pressurizing pump 56 are turned on.
and start backwashing by recycling within the pipeline. At this time, the feed pump 22 is activated. This backwash operation is 20
It is also possible to use industrial water instead of the treatment liquid for about 30 minutes.

In the purification device according to the present invention, as mentioned above, the filtration opening of the screen is formed into a slit shape, so that the threads do not get stuck or get tangled. The screen will stop automatically.There is a backwash nozzle inside the screen that sprays cleaning liquid toward the filtration port while rotating relative to the screen, so the backwash caused by this spray shower is This effectively removes lint, etc. attached to the outer surface of the screen and causes it to float.As a result, light items float up and heavy items settle and are processed outside the screen. , there is less clogging in the screen, there is no need to periodically replace the screen, and moreover, the filtration action can be performed effectively at all times, and the processing liquid itself is reliably filtered. If used in a painting line booth like the one in the example above, there is less risk of foreign matter clogging the shower nozzle.In the past, as many as 45 to 50 nozzles in the booth were clogged in one week. By incorporating the purification device according to the present invention, only about 10 to 15 blockages occur during a long period of one month.In other words, the rate of blockages is reduced and the period required for it is also shortened. The screen is not woven like a net, e.g.
Since it is formed into a cylindrical shape from a single plate, it does not open even when the pressure or flow rate increases, and as a result, filtration accuracy is always kept constant. If the bottom of the tank is formed with a horizontal wall surface as in the past, the settled foreign matter (residue) will remain there, but as in this invention, the bottom of the tank is formed in a tapered shape downward. This allows foreign matter to flow smoothly to the outlet and be effectively disposed of.

In the above embodiment, the tank had a fixed screen and a rotating nozzle, but it may also have a rotating screen and a fixed nozzle. Furthermore, both the screen and the nozzle may be configured to rotate in opposite directions or in the same direction. In short, it is sufficient that relative rotation occurs between the two. In the embodiment, the filtration opening has a horizontal slit, but the filtration opening may be vertical or inclined. The tank is
It can be configured as desired depending on the setting location, such as a large diameter type as shown in Figure 6, or a small diameter type as shown in Figure 7, but the pressure on the screen surface From the viewpoint of reducing loss and improving the dust removal effect, the large diameter type shown in FIG. 6 is preferable. The type shown in FIG. 6 has Do/D =0.
5-0.8, Lo/1. - The preferred size ratio range is 0.5 to 1.0. The screen may be oriented horizontally instead of vertically in the axial direction as in the embodiment.

〔Effect of the invention〕

As seen above, the purification device according to the present invention includes a tank having an inlet for the fluid to be purified and an outlet for extracting foreign matter removed from the fluid, and a cylindrical shape disposed in the tank. A body having a large number of filtration ports on its circumferential surface, the internal space of which communicates with the external space of the tank only through these filtration ports, and which discharges the fluid after filtration. In the purification device equipped with a screen having a discharge port, the tank has at least its lower part tapered downward, and has the foreign matter extraction port at its lower end, and the screen includes:
The filtration port is formed in a slit shape, and
It is characterized in that it is equipped with a backwashing nozzle inside which injects cleaning liquid toward the filtration port while rotating relative to the screen with its central axis as the center of rotation, thereby making filtration effective. and can eliminate the need for maintenance.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the purification device according to the present invention, Fig. 2 is a flow sheet showing how this purification device is incorporated during the degreasing process, and Fig. 3 is the arrangement of filtration ports. Figure 4 is a side view of the backwashing device, Figure 5 is a sectional view taken along line V-V in Figure 4,
FIGS. 6 and 7 are explanatory diagrams showing the different sizes of tanks and screens of the purifier. 16... Tank 18... Inlet 30... Outlet port 35... Screen 36... Filtration port 38... Filtrate outlet 44... Backwash nozzle agent Patent attorney Matsu Takehiko MotoFigure 3Figure 435''' Figure 5Δ Figure 6Figure 7

Claims (2)

[Claims] (1) A tank having an inlet for the fluid to be purified and an outlet for removing foreign matter removed from the fluid, and a cylindrical body disposed within the tank with a number of filtration filters on its circumferential surface. In a purification device comprising a screen having vents, the internal space of which communicates with the external space of the tank only through these filtration vents, and having a discharge port for removing the filtered fluid. , the tank has at least a lower portion thereof tapered downward and has an outlet for extracting the foreign matter at the lower end, and the screen has a filtration opening formed in the shape of a slit, A purification device comprising a backwashing nozzle therein that injects a cleaning liquid toward the filtration port while rotating relative to the screen about its central axis. (2) The purification device according to claim 1, wherein the backwashing nozzle has an elongated ejection hole. (3) The screen includes a scraper that rotates relative to the screen. Claim 1, wherein a brush attached to the tip of the scraper removes the residue attached to the filtration port from inside the screen.
The purification device according to item 1 or 2.