JPS62244411A - Backwash filter - Google Patents

Abstract

PURPOSE:To backwash filter elements effectively by flowing part of filtered liquid into non-working filter element, backwashing elements one by one in turn, and also backwashing regularly or at the time of heavy clogging by gas. CONSTITUTION:Liquid flowing from a flow inlet 10 into a primarily chamber 8 comes from a liquid introduction port 13 into a separating tube 16, passes through a filter element 19 to be filtered, moves into a secondary chamber 9 and flows out of a liquid outlet 11. Part of filtered liquid flows into a filter element 19' through a flow line 51 equipped with a valve body 50, backwashes the element 19', and passes through a liquid introduction hole 13' and a drain discharge line 15' to discharge sludge out of a drain port 31. After cleaning the filter element 19', the revolving shaft 27 is revolved to backwash the following element 19. By compressed gas supplied from an N2 gas nozzle 52, non- working element 19' is backwashed to eliminate clogging to a great extent.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a backwash type filter, and more specifically, it is used for automatic continuous precision filtration of various liquids such as oil and water in the industrial machinery field and food industry field. It is something that is used.

[Prior Art] As shown in Fig. 5, a conventional backwashing type filter divides the inside of a cylindrical sealed container El into upper and lower parts by supporting plates, and the liquid guide holes C are arranged in the same circle in the element supporting plate. A number of filtration elements d are provided on the circumference, a filtration element d is arranged in each of the liquid guide holes c, Jz, and an axis e is rotatably installed in the center of the cylindrical closed container a and the element support plate. ! A drain plate f is provided below the element support plate 1illIe to sequentially block off a portion of the plurality of liquid guide holes C.

Liquid such as oil supplied from the following inlet 0 ( ) of the cylindrical sealed container a flows into each filtration element d from the liquid guide hole d that is not blocked by the JJI liquid plate [ and is filtered It flows out from the outlet Dh at the top of the cylindrical sealed container a.

Foreign matter such as dust in the liquid gets caught on the inner surface of the filter membranes I-d, but the liquid does not flow from below into the filter membrane L-d, which is blocked by the drain plate f, and the filtered liquid is A part of the liquid flows from the filtration surface, foreign matter caught on the inner surface of the filtration element d is dropped, and is passed from the liquid guide hole C to the drain hole i drilled in the drain plate f, and then to the lower end of the shaft e. The washing liquid is discharged from a washing liquid discharge line k through a drain hole j provided therein.

After cleaning the first filter element d, IIIe
Rotate the filtration filter causing the following blockage l-
Move the drain plate f to the d side and backwash with part of the filtered liquid.

In this way, liquid is continuously filtered.

[Problems to be Solved by the Invention] However, in a filter that backwashes the filtration element d with filtered liquid as in this method, when the mesh size of the filtration element d becomes fine, the filtration becomes difficult due to insufficient backwashing power. The element d becomes clogged at an early stage, and the filter must be opened each time, and the filter element d must be cleaned with compressed air or the like, resulting in a disadvantage that a great deal of effort is required for maintenance.

1 Means for Solving Problem 1 In order to solve the above-mentioned conventional problems and to reduce the efficiency of backwashing of the filtration element by 1- It is partitioned into three chambers, upper, middle and lower, by a support, and a liquid inlet [1] is provided in the primary chamber on the side, and a liquid outlet is provided in the upper secondary chamber, passing approximately through the center of the casing and each support. A rotating shaft is disposed through the rotating shaft, three or more liquid introducing holes are bored in the lower support around the rotating shaft, and a separating tube containing a filtration element is liquid-tightly placed above each of the liquid introducing holes. The interior of the filtration element in each separating tube and the secondary chamber are connected to a communication passage bored in the upper support body in a number equal to the number of filtration elements and a passage through the upper support body of the rotating shaft. They can communicate with each other through recessed outflow grooves, and at least one of the plurality of liquid guide holes and a drain discharge hole drilled in the lower part of the rotating shaft can be sequentially communicated with each other through a drain discharge path. A flow path that can communicate with one of the communication paths is bored in the outflow vortex portion of the rotary shaft, and a spring valve is provided in the flow path so that the filtered liquid flowing through the outflow groove flows into the flow path. One filtration element can be backwashed, a backwashing gas nozzle is inserted into the drain discharge hole, and the gas nozzle and the downstream side of the spring valve of the flow path having the spring valve are communicated through a flow path for backwashing. The first r-filtration element can be backwashed by the gas, and furthermore, the passage through the upper support of the rotary shaft communicates with the flow passage having the spring valve, and the communication passage communicates with the adjacent passage, and the gas and A flow path is bored to guide the filtered liquid to a small chamber provided so as to surround the upper part of the rotating shaft, and a valve is opened and closed between the small chamber and the secondary chamber using the pressure of the filtered liquid. A backwash type filter was constructed by connecting an openable and closable gas rear pipe communicating with the small chamber to the upper cover so as to communicate through the pores.

1. The liquid that has flowed into the primary chamber from "1" enters the separating tube through other liquid introduction holes that are not blocked by the drain outlet, passes through the aperture element, is filtered, and is filtered into each channel. Transfers to the secondary chamber through the passage and outflow groove, and the liquid comes out 1]
Filtered liquid flows out.

A part of the filtered liquid flows into the non-operating filtration system 1, which is blocked by the drain discharge path, through a flow path that also has a spring valve, and when it passes through the filtration element from the inside to the outside, the filtration occurs. Backwash the element, liquid guide hole, drain JJ
The sludge is discharged from the drain hole at the lower end of the rotating shaft via the + outlet path.

After cleaning one filtration element, the next filtration element can be backwashed by turning the rotating shaft. Furthermore, when the F condensed gas is supplied from the gas nozzle, it flows into the non-operating filtration element, and the filtration element is backwashed by the gas passing from the inside to the outside, thereby eliminating clogging to a high degree.

The gas in the filtration element and separating tube that has been backwashed by the gas is pushed out by the inflowing liquid when the rotating shaft rotates and is removed from the drain discharge path, and reaches the small chamber through the communication path and flow path. Gas is discharged from multiple pipes.

When the gas double pipe is closed when all the gas has been exhausted,
The filtered liquid that has flowed into the small chamber opens the valve with its own blade and flows out from the outflow pore to the secondary chamber.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention, in which an upper cover 3 is attached to the upper side of an upper flange 2 fixed to the upper end of a cylindrical body 1.
A lower cover 5 is removably fitted and fixed to the lower side of the lower inner 7 flange 4 fixed to the lower end of the cylinder 1, and further fixed to the inner lower part of the cylinder 1. A support body 7 is fixed to the intermediate inner flange 6 which is partitioned into a lower first wash chamber 8 and an upper secondary chamber 9, and a liquid inlet 10 is provided in the cylinder 1 on the side of the wash chamber 8. A liquid outlet 11 is provided at the top of the cylinder 1 on the side of the secondary chamber 9.

A shaft hole 12 is bored in the center of the support 7, and a plurality of liquid guide holes 13 are bored around the shaft hole 12 on the same circumference, so that the six liquid guide holes 13 and the shaft hole 12 opening 14 on the inner peripheral surface of
These are communicated with each other through a drain discharge path 15.

Separating tubes 16 are liquid-tightly inserted from two sides of the six liquid guide holes 13, and the communicating tubes 18 having communicating holes 17 are taken out in a water-tight manner at the upper end of each separating tube 16. A filtration element 19 is attached to the lower end of each communication pipe 18.

An annular inner boss 20 is fixed to the inner peripheral side of the cylinder 1 on the side of the secondary chamber 9 so as to be located below the liquid outlet 11, and the upper support body 21 can be attached to and detached from the inner boss 20 in a liquid-tight manner. It fits well. A hole 22 bored in the lower side of the upper support 21
Insert the upper end of each of the communication pipes 18 into the name tag 22.
A communication path 25 communicates between the upper support body 21 and an opening 9 formed in the inner circumferential surface of the shaft hole 23 formed in the center of the upper support body 21 .

The shaft hole 23 of the upper support body 21 and the shaft hole 12 of the support body 7
A rotary shaft 27 is rotatably disposed so as to pass through a shaft hole 26 formed in the lower cover 5.

A drain discharge hole 28 is bored in the center of the lower part of the rotating shaft 27,
The drain outlet hole 28 is opened on the side surface of the rotating shaft 27 to form an opening 29, and the opening 29 is connected to the drain outlet passage 15.
', and the opening 29 is provided (the inlet groove 30 is recessed so as to have a small diameter over the required range except for the drain part), and the inflow groove 30 is recessed so that it can communicate with Road 15
These are in communication with each other so that liquid can flow in. Furthermore, a portion of the rotating shaft 27 protruding from the lower cover 5 is covered with a bearing cover 32 having a drain outlet 31, so as to prevent backwashing.
The sludge produced is discharged from the drain outlet 31 via the drain outlet 15' and the drain outlet 28.

A hole 33 is provided at the center of the upper end of the rotating shaft 11127, and an intermediate shaft 34 disposed to pass through the upper cover 3 is inserted into the hole 33 and is prevented from rotating by a pin 35. The output shaft 37 of the rotary drive device 36 is connected so that the rotation '11+27 can be rotated intermittently by a required angle.

Further, a hole 11 part 38 that communicates with the communication passage 25' and a hole 1 part 39 adjacent to the opening 38 are provided in the - part support rest 21 of the rotation part 111127. The openings 38° and 39 are provided (with an outflow groove 40 in the area other than the closed part).
is recessed over a required range so that the outflow groove 40 communicates with an outflow hole 42 formed in the boss 41 extending through the rotary shaft 27 port of the upper support body 21.

A valve chamber 47 is recessed in the vicinity of the outflow groove 40 of the rotating shaft 27, the 11-21 part 48 of the valve chamber 47 faces the outflow groove 40, and the opening 48 is biased by a spring 49. The valve chamber 47 is opened and opened by a valve body 50, and the valve chamber 47 and the above-mentioned spacer section 38 are communicated with each other by a flow path 51.

Furthermore, an N2 gas nozzle 52 for backwashing is inserted into the drain discharge hole 28 through the bearing cover 32,
The gap 11.1 is fixed airtightly and relatively rotatably deeper than the part 29, and the drain discharge hole 28 and the flow path 51 are communicated through the flow path 53, so that the N2 gas injected from the N2 gas nozzle 52 is Flow path 53, flow path 51, communication path 25'
, through the communication hole 17' to the filter element 19' so that it can be backwashed.

A small chamber 54 is formed on the lower side of the middle shaft 34 of the cover 3.
An outflow pore 55 is provided in the wall of the small chamber 54 to communicate the inside of the small chamber 54 with the secondary chamber 9, and the outflow pore 55 is connected to the piston rod 57 of the screw valve 56. A spring 59 provided in the head side chamber 58 of the screw l~n valve 56 biases the screw l~en 60 in the closing direction, and also connects the rod side chamber 61 of the piston valve 56 and the inside of the small chamber 54. Communication is provided through a through hole 62, and a through hole 63 is provided in the head side chamber 58 of the screw valve 56 to allow liquid to freely flow in and out of the head side chamber 58.

The opening end of the hole 33 provided at the upper end of the rotating shaft 127 is made large in diameter, and a flange plate 72 fixed to a small part of the intermediate shaft 34 is attached so that an annular flow path 64 is formed in the large diameter part. Flow passages 65 and 66 are formed in the intermediate shaft 34 and the rotary shaft 27 so that the intermediate shaft 34 and the rotary shaft 27 are airtightly fitted, and a passage 65 and 66 are respectively formed in the intermediate shaft 34 and the rotary shaft 27 so as to communicate with the part 39. A hole 67 is bored so that the flow path 65 and the annular flow path 64 communicate with each other, and the flow path 65 and the small chamber 54 communicate with each other.j5
A hole 68 is drilled to allow this.

Furthermore, a waste compound pipe 69 is connected to the upper cover 3 so that it can communicate with the small chamber 54 and which operates an on-off valve.

In the figure, 43 is a bearing, 44 is a bearing, 46 is a sleeve, 70 is a check valve, and 71 is a backwash position detector.

With the structure described above, when food oil is made to flow into the washing chamber 8 from the liquid inlet 10 in a food oil refining process, for example, the food oil is recessed in the penetrating portion of the rotating shaft 27 with the support body 7. From each drain discharge hole 15 through the inflow groove 30 to the liquid guide hole 1
3 and into the separating tube 16. At this time, the part 14' between the other drain hole 15'
Since the rotating shaft 27 and the drain hole 15 are in close contact with each other, the drain discharge hole 15
Food oil does not flow into ′.

The cooking oil that has reached the inside of the separating tube 16 passes through the filtration element 19 from the outside to the inside to be cleanly filtered, and passes through the communication hole 17 of the communication pipe 18 to the upper support 21.
The clean food oil flows out from the opening 24 through the outflow groove 40 and into the secondary chamber 9 through the outflow hole 42 (from the outflow port 11).

A part of the clean food oil in the outflow groove 40 pushes the valve body 50 and spring 49 of the rotating shaft 27 and flows into the valve chamber 47, and flows from the opening 38 of the flow path 51 to the opening 2 of the upper support 21.
4', the communication passage 25', and the communication hole 17' of the communication pipe 18', and flow into the filtration element 19', and as it passes through the filtration element 19' from the inside to the outside. Foreign matter attached to the outside of the ' is removed,
The filter element 19' is backwashed.

The removed sludge is transferred to the separating tube 16'
The water flows downward through the liquid introduction hole 13' of the support body 7, the drain discharge path 15', then passes through the drain discharge hole 28 of the rotation @27, and is discharged from the drain discharge hole 31 of the bearing cover 32. At this time, the clean oil that has flowed into the flow path 51 also attempts to flow from the flow path 53 to the N2 gas nozzle 52, but is blocked by the check valve 70.

In this way, when the automatic backwashing of one filter element 19' is completed, the rotary drive device 36 rotates q1+27 through the intermediate shaft 3/l to the required angle (360°÷number of filter elements, in the case of this embodiment, 45°) rotation. Rotating axis 2
The part 29 between the drain jJI outlet 28 of No. 7 is adjacent to the drain j + outlet IFi' and the drain outlet 15
This prevents the inflow of food oil and the outflow of sludge. At the same time, the flow path 5 of the rotating shaft 27
One opening 38 communicates with the communicating passage 25' adjacent to the communicating passage 25', and a portion of the clean cooking petroleum flows into the next filter element 19 for backwashing.

Normally, the above-mentioned backwashing operation is performed periodically or when the filter element 19' becomes severely clogged.
When the differential pressure between 0 and liquid output 1- and +11 becomes large, N
Perform backwashing using 2 turtles.

That is, when N2 gas is supplied from the N2 gas nozzle 52 to the back of the drain discharge hole 28, the N2 gas flows through the flow path 53, the flow path 51, and between the [1 section 38 and the U old section 24 of the section support 21]. ', communication passage 25', communication hole 17' of communication pipe 18'
When passing through the filtration element 19' from the inside to the outside, foreign matter attached to the outside of the filtration element 19' is removed.

The removed sludge is transferred to the separating tube 16'
The liquid flows downward through the liquid introduction hole 13' of the support body 7, and drains through the drain discharge path 15', then passes through the drain discharge hole 28 of the rotating shaft 27, and is discharged from the drain discharge hole 31 of the bearing cover 32. At this time, N2 gas pressure is applied to the valve body 50 in the valve chamber 47 in addition to the elastic force by the spring 49, the opening 48 is closed, and the oblique oil in the outflow groove 40 does not flow into the valve chamber 47.

In this way, when the backwashing of the first filter element 19' with N2 gas is completed, the rotation drive device 36 rotates the filter element 19' by +1
111127, the drain discharge passage 15'
The communication between the gap 14' and the opening 29 of the drain discharge hole 28 is disconnected, and the edible oil in the Horaku 8 flows into the drain discharge passage 1.
The liquid enters the separating tube 15' through the liquid introduction hole 13' and the liquid introduction hole 13', and passes through the filter element 19' from the outside to the inside.

Further, the opening 24' of the communication passage 25' and the 11 part 339 of the rotating shaft 27 communicate with each other due to the rotation 11γ of the rotating shaft 27.
After gas backwashing, the N2 scum that had filled the inside of the filter element 19', etc., can be removed from the communication path 7! with the scum removal pipe 69 open. j+, part 39, flow path 66, flow path 64
, is pushed out into the small chamber 54 from the hole 6B via the flow path 65,
The gas is discharged through the gas vent pipe 69. As a result, the N remaining in the nitride membrane 1-19' etc. after N2 gas backwashing is removed.
2 gases are taken out and consumed by IJ+ and replaced by 1 oil.

After exhausting the residual N2 gas, the valve of the waste removal pipe 69 is closed. At this time, the filtration bay edible oil that has flowed into the filtration bay 1-19' flows into the small chamber 54 from the hole 68 through the residual N2 gas discharge path, and further from the through hole 62 to the screw 1--n valve 56. It flows into the head side chamber 61, the spring 59 is bent, the screws 1 to 60 are moved in the opening direction, and the filtered general-purpose food oil flows out from the small chamber 54 to the knee joint 9 through the outflow pore 55, and other It joins with the filtered edible oil from the filter element 19 and flows out from the liquid outlet 11.

In this way, the filter element 19' which has been backwashed with N2
After the N2 gas is discharged, the edible oil is filtered, but the next filter element is rotated 1I to backwash the N2 gas.
When the III 27 is rotated, the filtered bay food oil that has been passing through the flow path 66 will now reach the secondary chamber 9 through the outflow groove 40 and the outflow hole 42.

Note that the backwash filter of the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the gist of the present invention, such as the shape of the casing may be any shape other than a cylinder. Of course, you can add more.

[Effects of the Invention] As explained above in F and t2, the backwash type filter of the present invention exhibits various excellent effects as described below.

<■> The liquid is filtered by flowing from the outside to the inside of the filtration element, and a portion of the filtered liquid is flowed from the inside to the outside of the non-operating filtration element for backwashing, which is performed in turn for each filtration element. C1 cleaning can be efficiently performed using a small amount of filtered liquid, and the cleaning effect is high, resulting in an automatic cleaning filter with 21 impacts.

Ru.

0 Gas J, Reset IU] (81) Backwashing can be performed when the filter is severely clogged, so most of the clogging of the filter element can be removed, and the filter maintenance interval can be reduced. can be expanded dramatically.

(III) Normally, the filtration element is backwashed with a portion of the filtration liquid, and backwashed with gas periodically or when it is heavily clogged, so the use of expensive gas can be minimized. can.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the backwash filter of the present invention,
Figure 2 c, J, ys Partial explanatory diagram of ■-■ direction of Figure 1,
Figure 3 is a view taken in the lll-1 direction of Figure 1, and Figure 4 is a view of the
FIG. 5G, 1 is an explanatory diagram showing an example of a conventional backwash filter. 1 is a cylindrical body, 3 is a cylinder, 1 is a partial cover, 5 is a lower cover, 7 is a support body, 8 is a primary chamber, 9 is a secondary chamber, and 10 is a liquid container.
-1, 11 are liquid outlets, 13.13' are liquid guide holes, 15.1
5' is a drain discharge path, 16.16' is a separating tube, 17.17' is a communicating hole, 18.18' is a communicating pipe, and 19°19' is a filtering element. 21 is an upper support body, 25° 25' is a communicating path, 27 is a rotating shaft, 28 is a drain outlet hole, 30 is an inflow surface, 31 is a drain outlet, 34
is an intermediate shaft, 36 is a rotary drive device, 39 is an opening, 40 is an outflow groove, 42 is an outflow hole, 47 is a valve chamber, 50 is a valve body, 51
52 is a flow path, 52 is a N2 gas nozzle, 53 is a flow path, 54 is a small chamber, 55 is an outflow pore, 56 is a screw valve, 62 is a through hole, 64° 65.66 is a flow path, 69 is a waste removal pipe shows. Special applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) The inside of the casing is divided into three chambers, upper, middle and lower, by two upper and lower supports, a liquid inlet is provided in the lower primary chamber, and a liquid outlet is provided in the upper secondary chamber, approximately at the center of the casing and each support. A rotating shaft is disposed through the lower support body around the rotating shaft, and three or more liquid guide holes are bored in the lower support body around the rotating shaft, and a separating tube containing a filtration element is inserted into the upper side of each liquid guide hole. A communicating passage, which is arranged closely, and which connects the inside of the filtration elements in each of the separating tubes and the secondary chamber with the same number of filtration elements as the number of filtration elements in the upper support, and an upper support penetrating portion of the rotating shaft. and at least one of the plurality of liquid guide holes and a drain discharge hole bored in a lower part of the rotation shaft are sequentially communicated through a drain discharge channel. A flow path that can communicate with one of the communication paths is bored in the outflow groove of the rotary shaft, and a spring valve is provided in the flow path so that the filtered liquid flowing through the outflow groove flows into the one of the communication paths. The filtration element can be backwashed, a backwashing gas nozzle is inserted into the drain discharge hole, and the gas nozzle and the downstream side of the spring valve of the flow path having the spring valve are communicated with each other by a flow path to discharge the backwashing gas. The one filtration element can be backwashed by the above, and furthermore, a communication passage communicating with the flow passage having the spring valve in the upper support penetrating portion of the rotating shaft communicates with an adjacent communication passage, and the gas and filtered liquid are connected to each other. A flow path is drilled to guide the liquid to a small chamber provided so as to surround the upper part of the rotating shaft,
The small chamber and the secondary chamber can be communicated through an outflow hole having a valve that opens and closes with the pressure of the filtered liquid, and an openable and closable gas vent pipe communicating with the small chamber is connected to the upper cover. Features a backwash filter.