JPH0470042B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an automatic filter used to remove foreign substances such as dirt and sand from liquids and liquid substances such as industrial water, industrial waste liquid, crude oil, and cement milk. It is related to the device.

(Prior Art) The following is known as a conventional automatic filter device.

That is, a cylindrical filtration tank, a cylindrical element cylinder fixedly installed in the filtration tank and provided with a filtration screen on the side circumferential surface, and a cylindrical element cylinder connected to the filtration tank to allow the raw solution to flow into the filtration tank. a filtrate inflow pipe, a filtrate outflow pipe that is connected to the element cylinder, extends outside through the filtration tank, and causes the filtrate in the element cylinder to flow out; and the filter rotatably disposed outside the element cylinder. Automatic filter devices are known that include an external scraping member that contacts the screen.

In this automatic filter device, when the raw liquid flows into the filtration tank from the raw liquid inflow pipe, foreign substances such as rubber are filtered out by the filter screen, enters the element cylinder and becomes filtrate, while foreign substances attached to the filter screen are removed. The filtering function is maintained by automatically scraping by rotating the external scraping member.

(Problem to be Solved by the Invention) However, according to the above-mentioned automatic filter device, depending on the type of stock solution to be treated, foreign matter in the stock solution may get stuck in the filter screen and be removed only by the scraping member. It may not be scraped off sufficiently and the filter screen may become clogged. In order to prevent such clogging, the operation of the automatic filter device must be stopped and the filter screen must be thoroughly cleaned, which is undesirable in terms of operating costs. Therefore,
Possible methods include spraying liquid from a cleaning nozzle onto the inner surface of the filtration screen or cleaning the inner surface of the filtration screen with an internal scraping member, but depending on the type of raw solution to be treated, a backwash nozzle may be No longer needed.

According to conventional thinking, an automatic filter device for stock solutions that can be relatively easily filtered would be equipped with only an external scraping member, whereas an automatic filter device for stock solutions that are difficult to filter would be equipped with an external scraping member. In addition, one will be manufactured that is equipped with a backwash nozzle device. For this reason, the designs and parts used are completely different between the two, leading to a rise in manufacturing costs. Furthermore, it is not possible to easily modify one to the other; for example, it has been impossible to easily modify the equipment to add a backwash nozzle device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes a cylindrical element cylinder fixedly installed in the filter tank and equipped with a filter screen on the side circumferential surface, and a stock solution inflow pipe that is connected and causes the stock solution to flow into the filtration tank;
In an automatic filter device comprising a filtrate outflow pipe that is connected to the element cylinder, extends outside through the filtration tank, and drains the filtrate in the element cylinder, the filter screen is contacted with the outside of the element cylinder. At the same time, support holes are provided in the top plate of the element cylinder and the bottom of the filtrate outflow pipe at positions located on the center line of the element cylinder, and these support holes are closed with a closing member. It is characterized in that it is formed so as to be able to rotatably support a backwash nozzle device or an internal scraping member that can be arranged along the center line of the element cylinder. When the backwash nozzle device or the internal scraping member is supported by the support hole of the element cylinder top plate and the support hole of the bottom of the filtrate outflow pipe, the upper end thereof engages with the upper support part of the external scraping member and scrapes. It is preferable to configure the removing member and the backwash nozzle device or the internal scraping member to rotate synchronously.

(Function) The automatic filter device of the present invention can be used in the same manner as conventional automatic filter devices by closing the support hole provided in the element cylinder top plate or the bottom of the filtrate outflow pipe with a closing member.

On the other hand, when processing a type of stock solution that may get into the filtration screen and cause a decline in filtration function, a backwash nozzle device (or internal scraping member) is arranged inside the element cylinder along its center line, By rotatably supporting the backwash nozzle device (or internal scraping member) using the upper and lower support holes, and rotating this, foreign matter that is deeply embedded in the filter screen will be removed from the backwash nozzle. Backwash action of ejected backwash liquid, etc. (or contact rotation action of internal scraping member)
This causes the foreign matter to float on the outer circumferential surface of the filter screen, reducing the degree to which the foreign matter is bitten into the screen, and making it easier to scrape off the foreign matter by contact rotation of the external scraping member.

The above two types of automatic filter devices have the same basic structure; the former type only requires a closing member, while the latter type has a backwash nostle device (or internal All you need to do is prepare a scraping member. If the basic structure is manufactured in the manufacturer's factory, the user can easily assemble the desired type of automatic filter device at the user's installation location.

For example, when converting from the former type to the latter type, the closing member is removed from the support hole, and a backwash nozzle device (or internal scraping member) is placed inside the element cylinder instead. It is only necessary to rotatably support this using the support hole, and the modification described above can be carried out extremely easily.
Modifications in the opposite case can be carried out very easily as well.

(Example) An example of the present invention will be described based on FIGS. 1 to 8.

The automatic filter device shown in FIG. 1 and the automatic filter device shown in FIG. 5 differ in whether or not they are equipped with a backwash nozzle device 1, but otherwise have a common structure. In other words, the user can freely select either the one shown in Figure 1 or the one shown in Figure 5 according to his/her preference, and if the basic structure is completed at the manufacturing factory, it can be replaced as an optional part at the installation site. You can complete your desired type by adding or not adding a washing nozzle device. The structure also allows for extremely easy modification from one type to the other.

First, a type of automatic filter device not equipped with a backwash nozzle device 1 will be described based on FIGS. 1 to 4.

The cylindrical metal filtration tank 2 has a top plate 3 and a side peripheral wall 4.
and a bottom plate 5. A stock solution inflow pipe 6 is connected to the upper part of the side peripheral wall 4 for allowing a stock solution such as industrial water to flow into the interior.

As shown in FIG. 2, this stock solution inflow pipe 6 is connected in the connection direction of the side peripheral wall 4, and the stock solution that flows into the filtration tank 2 under a predetermined pressure becomes a swirling flow and flows downward. It's becoming like that. The bottom plate 5 is arranged diagonally as shown in FIG. That is, a plate having an elliptical shape and having a through hole 56 in the center is attached obliquely to the lower end of the side peripheral wall 4. As shown in FIGS. 1 and 2, a foreign matter discharge pipe 7 is connected to a lower end of the side wall 4 at a location corresponding to a low portion of the bottom plate 5 in a tangential direction of the side wall 4. As shown in FIGS. This foreign matter discharge pipe 7 is closed by a normal on-off valve (not shown), but when the on-off valve is opened, the foreign matter accumulated at the bottom of the filtration tank 2 is discharged to the outside together with the stock solution. By connecting the foreign matter discharge pipe 7 to a position communicating with the lower part of the bottom plate 5, foreign matter can be easily discharged, and by connecting the foreign matter discharge pipe 7 in the tangential direction of the side peripheral wall 4. , the swirling flow can be utilized and foreign matter can be effectively discharged. Inside the filtration tank 2, a cylindrical element cylinder 8 is erected and fixed on a filtrate outflow pipe 12 in a concentric state with the filtration tank 2. This element tube 8 is provided with a top plate 9 and a side circumferential portion 11 mainly composed of a filter screen 10, and the bottom portion is open. As the filtering screen 10, a wedge wire wound into a cylindrical shape, a punching plate formed into a cylindrical shape, etc. can be used. As shown in FIG. 1, the element cylinder 8 is erected and fixed on the filtrate outflow pipe 12.

The filtrate outflow pipe 12 is bent into an L shape, and the upper part of the vertical part 13 projects above the bottom part 5 through the through hole 56 and is positioned in the filtration tank 2. The bottom plate 5 and the filtrate outflow pipe 12 are connected to the through hole 56.
The parts are welded watertight. Then, the element cylinder 8 is placed on the upper end 14 of the filtrate outflow pipe 12.
The lower end 15 is placed, and the engagement pin 16 protruding from the inner surface of the upper end of the filtrate outflow tube 12 engages with the L-shaped hook 17 provided on the inner surface of the lower end of the element cylinder 8. is erected and fixed on the filtrate outflow pipe 12. The filtrate outflow pipe 12 takes out the filtrate filtered on the filter screen 10 of the element cylinder 8 from the bottom of the element cylinder 8, guides it downward through its vertical part 13, and then laterally through its horizontal part 18. .

The upper space, which is about 2/3 of the interior of the filtration tank 2, is a filtration space in which the element tube 8 is placed, and the lower space, which is about 1/3, is a foreign matter storage space. In the filtration space, an external scraping member 70 including a pair of brushes 19 is disposed in the space between the element tube 8 and the filtration tank 2. In the illustrated example, the frame member 20 of the external scraping member 70 is a horizontal rod 22 that fixes a pair of vertical rods 21, 21 at its upper end.
It is mainly composed of a boss 23 located at the center of and protruding upward. Both vertical rods 21, 21 are in symmetrical positions, and a roller 24 that rolls in contact with the lower end outer periphery of the side periphery 11 of the element cylinder 8 is attached to the lower end of each of the vertical rods 21, 21.
It is equipped with Further, a brush 19 is attached to the vertical rods 21, 21 via an arm member 24. In place of the brush 19, it is also possible to use a blade-shaped scraper made of fluororesin. The brush 19 is urged by a spring 26 so as to come into pressure contact with the filter screen 10.

The boss 23 is rotatably suspended by a support member 27 disposed near the inner upper end of the filtration tank 2 . That is, a bearing cylinder part 28 is formed in the center of the support member 27, and a flanged bushing 29 is fitted into the inner surface of the bearing cylinder part 28, while the boss 23 is connected to the flanged bushing 29.
A nut 30 is fastened to the boss 23 at a portion that is fitted into the boss 9 and projects upward from the flanged bush 29 (see FIG. 7 for details). As a result, the weight of the external scraping member 70 is supported by the bearing cylinder portion 28 of the support member 27 via the nut 30 and the flange portion of the flanged bush 29. Note that the axis of the boss 23 coincides with the center of the filtration tank 2. Further, the upper inner surface of the boss 23 is formed into a square hole 31. Further, on the lower surface of the horizontal rod 22 near the boss 23, there is a pair of power transmission pins 32, 3 that protrude downward.
2 is provided. However, for the type shown in FIG. 1, this power transmission pin 32 has no effect.

An electric motor 33 serving as a device for rotationally driving the frame member 20 is arranged on the top plate 3 of the filtration tank 2 . This electric motor 33 is preferably configured to be able to rotate in forward and reverse directions, but may be configured to rotate in one direction. Further, it is preferable to use a device with a built-in damping device or a device with a separate reduction gear. The output shaft 34 of the electric motor 33 passes through a hole 35 provided at the center of the top plate 3 and extends downward, and a square shaft portion 36 located on the tip side thereof engages with the square hole 31 of the boss 23. There is. Therefore, when the electric motor 33 is rotated, the external scraping member 70 rotates, and accordingly, the brushes 19, 19 rotate around the element tube 8 while pressing against the filter screen 10, thereby removing the filter screen. 10
It is possible to automatically remove foreign substances that are attached to or bit into the surface.

A support hole 38 is provided in the center of the top plate 9 of the element cylinder 8, that is, on the center line of the filtration tank 2, for penetrating and supporting a backwashing pipe 37, which will be described later.
In the type shown in FIG. 1, the support hole 38 is closed by a closing plate 39. As shown in detail in FIG. 3, its structure includes an O-ring 40 provided around the insertion part of the closing plate 39, and a mounting screw 41
The screw hole 42 corresponding to the screw hole 42 is a blind hole and has a watertight structure.

Also on the bottom of the bent part of the filtrate outflow pipe 12, located on the center line of the filtration tank 2, is a reverse line pipe 3, which will be described later.
Support hole 4 consisting of a screw hole for penetrating support of 7
In the type shown in FIG. 1, the support hole 43 is closed by a plug-shaped closing plate 44 as described above. Its structure is the fourth
As shown in detail in the figure, the closing plate 44 is screwed into the support hole 43 with a gasket 45 interposed between the closing plate 44 and the filtration/discharge pipe 12 to form a watertight structure.

According to the automatic filter device shown in FIGS. 1 to 4, the stock solution pumped by the pressure pump (not shown) flows into the filtration tank 2 through the stock tank inflow pipe 6, and is filtered by the flow pressure. Heading downward while turning. During this time, the stock solution is sent approximately evenly around the filtration screen 10, passes through the filtration screen 10, and flows into the element tube 8. At this time, foreign substances in the stock solution are captured by the filter screen 10,
The liquid flowing into the element cylinder 8 becomes a filtrate from which foreign matter has been removed. This filtrate is taken out to the outside through the filtrate outflow pipe 12. The other filter screen 1
The foreign matter caught in the filter screen 10 and attached thereto is scraped off by an external scraping member 19 and removed from the filter screen 10. At that time, the swirling flow of the stock solution acts to separate foreign matter from the filter screen 10, so
This is advantageous for removing foreign substances. Further, the swirling flow of the stock solution itself effectively works to separate foreign substances in the stock solution by centrifugal separation. In this way, the foreign matter is guided to the foreign matter storage space below the filtration tank 2. Then, when the foreign matter discharge pipe 7 is opened in a timely manner, the foreign matter is discharged to the outside together with a portion of the stock solution.

In this way, foreign matter adhering to the filtration screen 10 is automatically removed by the foreign matter scraping operation by the rotation of the external scraping member 70 and the foreign matter separation effect by the swirling flow of the stock solution, thereby preventing clogging of the filtration screen 10. Prevented for a long time.

In addition, the heavy element cylinder 8 has a fixed structure, and the light external scraping member 70 including the brush 19 has a rotating structure, so the power consumption of the electric motor 33 required for rotational driving can be reduced at low cost. It can be done.

Next, the automatic filter device shown in FIG. 5 will be explained. As already mentioned, this type has the same basic structure as the type shown in FIG. In this automatic filter device, the backwash nozzle device 1 is disposed on the center line of the filtration tank 2 so as to penetrate through the element cylinder 8 and the vertical portion 13 of the filtrate outflow pipe 12.

This backwash nozzle device 1 has its upper end rotatably supported by the top plate 9 of the element cylinder 8 using the support hole 38, and its lower end is supported by the filtrate outflow pipe 1.
A backwashing pipe 37 is rotatably supported on the bottom surface of the bent portion of No. 2 using the support hole 43. The upper end of this backwashing pipe 37 is closed as shown in FIG.
It is rotatably supported by a flanged bush 46 that is fitted into 8. A snap spring 47 is fitted to the upper end of the backwashing pipe 37 that protrudes above the flanged bushing 46, and when the snapring 47 is seated on the flange of the flanged bushing 46, the backwashing pipe 37 is closed. 37 weight is supported by the flange bushing 46. 48 is a gasket for obtaining a watertight structure. Furthermore, power transmission pins 49, 49 are provided at the upper end of the backwashing pipe 37, and are releasably engaged with the power transmission pins 32, 32 of the frame member 20. Therefore, when the frame member 20 rotates due to the rotation of the electric motor 33, the backwash pipe 37 simultaneously rotates in synchronization. The lower end of the backwash pipe 37 is open and connected to the supply pipe 50. This supply pipe 50
The backwashing liquid, backwashing steam, etc. are transferred to the backwashing pipe 3.
7, it is formed in an L shape, and its upper end communicates with the lower end of the backwash pipe 37. The lower end of the backwashing pipe 37 is rotatably supported by a flanged connector 51, as shown in FIG.
This flanged connector 51 is screwed into the support hole 43 of the filtrate outflow pipe 12, and the lower end of the backwashing pipe 37 is accommodated in the circular hole provided with the bush 52 at the top.
The upper end tapered threaded portion 54 of the delivery pipe 50 is screwed into the lower tapered threaded hole 53. 5
5 is an O-ring, and 59 is a gasket, both of which have a watertight structure.

A plurality of backwash nozzles 57, . . . are connected to the backwash pipe 37, as shown in FIGS. 5 and 6. In the illustrated example, six backwash nozzles 5
7, . ...but each backwash pipe 37
installed on. Backwash nozzle 57 and brush 1
9, their relative positions are always constant, but in the illustrated example, as shown in FIG. are doing. This is backwash nozzle 5
The backwashing liquid ejected from the filter screen 7 causes foreign matter that is deeply embedded in the filter screen 20 to float to the outer circumferential side, and then the brush 19 immediately scrapes off the foreign matter, which effectively removes foreign matter. This is because it can be removed. However, the relative positions of the backwash nozzle 57 and the brush 19 are not limited to the above, and for example, the front-back relationship with respect to the rotational direction can be reversed.

In addition, in order to change from the type shown in FIG. 1 to the type shown in FIG. Instead, the backwash nozzle device 1 may be incorporated.

The function of the automatic filter device equipped with the backwash nozzle device 1 shown in FIG. 5 is basically the same as that of the type shown in FIG. Since a cleaning action is added, clogging of the filter screen 10 can be further prevented over a long period of time.

Furthermore, although not shown, in the automatic filter device of the type shown in FIG. A member may be arranged and rotatably supported using the support holes 38 and 43. in this case,
Due to the rotation of the internal scraping member, foreign matter stuck in the filter screen is lifted to the outer periphery of the filter screen, making it easier to scrape off the foreign matter by the external scraping member 70.

(Effects of the Invention) According to the present invention configured as described above, the automatic filter device is provided with only an external scraping member by closing each support hole provided in the top plate of the element cylinder and the bottom of the filtrate outflow pipe. The process determines whether the backwash nozzle device or internal scraping member, which is an optional part, is rotatably supported in each of the support holes and used as an automatic filter device equipped with this and an external scraping member. It can be selected depending on the type of stock solution to be used. Furthermore, since the basic structure is common when manufacturing two types of automatic filter devices, it is advantageous in terms of cost. Also, conversion from one type to the other type can be easily performed.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention,
Fig. 1 is a partially cutaway front view of the entire device without a backwash nozzle device, Fig. 2 is a cross-sectional plan view thereof, Figs. 3 and 4 are enlarged sectional views of the main parts, respectively, and Fig. 5 6 is a cross-sectional plan view thereof, and FIGS. 7 and 8 are enlarged sectional views of the main parts thereof, respectively. 1... Backwash nozzle device, 2... Filtration tank, 4...
Side peripheral wall, 6... Raw solution inflow pipe, 8... Element tube, 9... Top plate, 10... Filtration screen, 12
...Filtrate outflow pipe, 38, 43...Support hole, 39,
44...Closing plate, 70...External scraping member.

Claims (1)

[Scope of Claims] 1. A cylindrical element cylinder fixedly installed in a filtration tank and equipped with a filtration screen on the side circumferential surface, and a undiluted solution inflow pipe that is connected to the filtration tank and allows the undiluted solution to flow into the filtration tank. and a filtrate outflow pipe that is connected to the element cylinder, extends outside through the filtration tank, and drains the filtrate in the element cylinder, wherein the filter screen is connected to the outside of the element cylinder. In addition to disposing an external scraping member that rotates in contact with each other, support holes are provided in the top plate of the element cylinder and the bottom of the filtrate outflow pipe at a portion located on the center line of the element cylinder, and these support holes are closed by a closing member. What is claimed is: 1. An automatic filter device, characterized in that it is formed so as to be closable, and to rotatably support a backwash nozzle device or an internal scraping member that can be arranged along the center line of an element cylinder. 2 When the backwash nozzle device or the internal scraping member is supported by the support hole of the element cylinder top plate and the support hole of the bottom of the filtrate outflow pipe, the upper end thereof engages with the upper support part of the external scraping member and the external scraper is removed. The automatic filter device according to claim 1, wherein the removing member and the backwash nozzle device or the internal scraping member rotate synchronously.