JPS62244412A - Backwash filter - Google Patents

Abstract

PURPOSE:To backwash filter elements effectively by flowing air for backwash into non-working filter element and backwashing elements one by one in turn. CONSTITUTION:Liquid flowing from a flow inlet 10 into a primary chamber 8 comes from a liquid introduction port 13 into a separating tube 16, passes a filter element 19 to be filtered, moves into a secondary chamber 9 and flows out of a liquid outlet 11. Air for backwash coming out of an air nozzle 52 flows into the filter element 19', backwashes the element 19', passes through a liquid introduction port 13' and a drain line 15' to drain sludge out of a drain port 31. After cleaning the filter element 19', a revolving shaft 27 is revolved to backwash the following element 19. Gas in the element 19' or the like is pushed out by liquid with the revolution of the revolving shaft 27 and exhausted out of gas exhaust tube 69. When the whole of air is discharged and the air exhaust tube 69 is closed, the device becomes stand-by.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a backwash filter, and in detail,
It is mainly used for automatic continuous precision filtration of fuel oil for marine diesel engines, but it is also used for automatic continuous filtration of liquids such as various oils and water in the industrial machinery field, food industry, etc. It is something that

[Prior Art] As shown in Fig. 5, a conventional backwash type filter divides the inside of a cylindrical sealed container a into upper and lower parts by an element support plate, and the liquid guide holes C are arranged on the same circumference in the element support plate. A number of filtration elements 11 are disposed above each of the liquid guide holes C, and an axis e is rotatably mounted at the center of the support plate for the cylindrical closed container a and the double membrane 1; A liquid drain plate f is provided below the element support plate of the axis e to sequentially block off a portion of the plurality of liquid guide holes C.

Liquid such as oil supplied from the population q of 1q of the cylindrical hermetic container a flows into each filtration element d from the liquid introduction hole d which is not blocked by the liquid drain plate f, is filtered, and flows into the upper part of the cylindrical hermetic container a. ] Flows out from 71h.

Foreign matter such as dust in the liquid gets caught on the inner surface of the filtration element d, but the liquid does not flow from below into the filtration element d, which is blocked by the liquid drain plate f, and a part of the filtered liquid flows onto the filtration surface. The foreign matter that is caught on the inner surface of the filtration membrane L-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 drain hole drilled at the lower end of the shaft e. It is discharged from the washing liquid discharge line k through the liquid hole j.

When cleaning of one filtration element d is completed, the shaft e is rotated to move the drain plate f to the side of the next clogged filtration element d, and backwashing is performed with a portion 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, if the mesh size of the filtration element d becomes fine, the filtration element will not be able to clean due to insufficient backwashing power. d caused clogging during the first stage and required a great deal of effort for maintenance.

Means for Solving Problem F" A) In order to solve the conventional problem of E and to enable efficient backwashing of the filtration element, the present invention is designed to separate the inside of the casing into two upper and lower parts. It is partitioned into three chambers, upper, middle and lower, by a support, and a liquid inlet is provided in the lower primary chamber, and a liquid outlet is provided in the upper secondary chamber, so that the liquid passes approximately through the center of the single-singing and each support. A rotating shaft is disposed through the lower support body, three or more liquid introducing holes are bored in the lower support body around the rotating shaft, and a separating gutter cove containing filtered Nimen 1- is liquid-tightly placed above each of the liquid holes. a communication passageway which connects the inside of the filtration element in the parading tube and the secondary chamber with the same number of filtration elements as the number of filtration elements in the upper support body, and a passage through the upper support body of the rotating shaft; at least one of the plurality of liquid guide holes and a drain outlet hole bored in the lower part of the rotating shaft are connected in sequence through a drain discharge channel. A backwashing air nozzle is inserted into the drain discharge hole, and an opening is provided in the air nozzle insertion portion and the upper support penetration portion of the rotating shaft so as to be able to communicate with the one communication path. The first filtration element can be backwashed by the backwashing air by closing the communication V through the flow path, and is adjacent to the communication path that communicates with the opening provided in the upper support penetration part of the rotating shaft. A flow path is bored in the rotating shaft to lead air and filtered liquid to a small chamber provided to surround the upper part of the rotating shaft, and the upper cover communicates with the small chamber and can be opened and closed. A backwash filter was constructed by connecting an air vent pipe.

[Function] The liquid that flows into the primary chamber from the liquid inlet enters the separating tube from other liquid introducing holes that are not blocked by the drain discharge path, passes through the filtration element, is filtered, and flows through each communication path and outflow. The filtered liquid passes through the groove to the secondary chamber and flows out from the liquid outlet.

The backwashing air from the air nozzle flows into the non-operating filtration element that is blocked by the drain discharge path through the flow path and communication path, and backwashes the filtration element as it passes through the filtration element from the inside to the outside. The sludge is then discharged from the drain hole at the lower end of the rotating shaft via the liquid guide hole and the drain drain path.

be done.

After washing the first filtration elmmen 1-, the next filtration elmmen] can be backwashed by rotating the rotating shaft.
In addition, the air in the filtration element and separating tube that has been backwashed by air is pushed out by the inflowing liquid when the rotating shaft rotates and the drain discharge path is removed, and enters the small chamber through the communication path and flow path. At this point, air (is discharged from the pipe).

When all the air has been exhausted, close the air vent pipe.
It will be in a standby state.

[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 1j is removably fitted and fixed to the lower side of the lower inner flange 4 fixed to the lower end of the cylinder 1; A support body 7 is fixed to an intermediate inner flange 6 fixed to a lower washing chamber 8.
and an upper secondary chamber 9, a liquid inlet 1'10 is installed in the cylinder 1 on the side of the secondary chamber 9, and a liquid outlet 111 is installed in the upper part of the cylinder 1 on the side of the secondary chamber 9. It is a pool.

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, and each liquid guide hole 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 tube 1 from above each liquid introduction hole 13
6 in a fluid-tight manner, and a communicating tube 18 having a communicating hole 17 is attached to the upper end of each of the separating tubes 16 in a water-tight manner. Each must be installed.

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 an upper support body 21 is attached to and detached from the inner boss 20 in a liquid-tight manner.) It fits like this. Hole 2 bored in the lower side of the upper support 21
2, respectively fit the upper end of each communication pipe 18 into the number hole 2.
2 and an opening 24 provided on the inner peripheral surface of a shaft hole 23 bored in the center of the upper support body 21 through a communication passage 25.

The shaft hole 23 of the upper support body 21 and the shaft hole 12 of the support body 7
and 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 1 no. 1 outlet hole 28 is opened in the side surface of the rotating shaft 27 so that it can communicate with the drain discharge path 15', and the drain hole 28 is opened over a required range other than the part where the opening 29 is provided. The inflow groove 30 is recessed so as to have a small diameter, so that the washing chamber 8 and the main drain discharge path 15 communicate with each other so that liquid can flow therein. Furthermore, the portion of the rotating shaft 11127 that protrudes from the lower cover 5 is a bearing cover 3 having a drain outlet 31.
2 so that the sludge removed by backwashing is discharged from the drain outlet 31 via the drain outlet 15' and the drain outlet 28.

−9= A hole 33 is provided at the center of the upper end of the rotating shaft 27, and the intermediate shaft 34 disposed so as to pass through the upper cover 3 is inserted into the hole 33 and is prevented from rotating by a pin 35. An output shaft 37 of a rotary drive device 36 is connected to the upper end of the rotary drive device 36, so that the rotation 1NI27 can be rotated intermittently by a required angle.

Furthermore, an opening 38 and an opening 38 that can communicate with the communication path 25' are provided at the portion of the rotating shaft 27 that passes through the upper support body 21.
8 is provided, and an outflow groove 40 is recessed over a required range in a range other than the area where the opening 38 and 39 are provided, and the rotation of the outflow groove 40 and the upper support body 21 is performed. axis 2
70 so that it can communicate with the outflow hole 42 bored in the boss 41.

An air nozzle 52 for backwashing is provided in the drain discharge hole 28,
The bearing cover 32 is inserted through the bearing cover 32 and fixed airtightly and relatively rotatably deeper than the opening 29, and the drain discharge hole 28 and the opening 38 are communicated with each other through a flow path 53, and the air nozzle The compressed air supplied from 52 is introduced into the filter element 19' through the flow path 53, the opening 38°24', the communication path 25', and the communication hole 17',
It is designed so that it can be backwashed.

A small chamber 54 is provided at the lower side of the intermediate 111134Ei-oil of the upper cover 3, and a small chamber 54 is provided at the upper end of the rotary shaft 27 (opening of the hole 33 [-1 end is made large diameter, and the lower part of the intermediate shaft 34 is The fixed flange plate 72 is airtightly fitted to form an annular flow path 64 in the large diameter portion, and the intermediate !11134
Flow passages 65 and 66 are respectively formed in the rotation shaft 27 so as to form a single flow passage communicating with the opening 39, and the flow passage 65 and the annular flow passage 64 are formed in the middle @34. A hole 67 is drilled to allow communication between the channel 65 and the small chamber 54.
A hole 68 is bored so as to communicate with each other.

Historically, an air vent pipe 69 having an on-off valve is connected to the upper cover 3 so as to communicate with the small chamber 54.

In the figure, 43 indicates rocking poles 1 to . 44. ．． 45 is a bearing, 46 is a sleeve, 70 is a check valve, and 71 is a backwash position detector.

With the above structure, when the fuel oil of a diesel engine, for example, is allowed to flow into the first wash chamber 8 from the liquid filler [2110], the fuel oil flows through the recessed portion in the flow passage portion between the rotary shaft 27 and the support 7. The liquid flows from each drain discharge hole 15 through the inflow surface 30 , passes through the liquid introduction hole 13 , and reaches the inside of the separating tube 16 .

At this time, the opening 14' of 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
No fuel oil flows into ′.

The fuel oil that has reached the separating tube 16 passes through the filter element 19 from the outside to the inside to be cleanly filtered, and then passes through the communication hole 17 of the communication pipe 18 into the 14-2 parts 1. ′
It reaches the communication path 25 of the I body 21 and flows out from the opening 24.
Clean fuel oil flows out from the outflow port 11 through the outflow hole 42 into the secondary chamber 9 through the outflow port 11.

Backwashing with compressed air is performed periodically or when the filter element 19' becomes severely clogged.

That is, when compressed air is supplied from the air nozzle 52 to the back of the drain discharge hole 28, the compressed air flows through the opening 3 of the flow path 53.
8 to the opening 24' of the upper support 21, and the communication path 25'
, passes through the communication hole 17' of the communication pipe 18' in order and flows into the filtration element 19'.
’ from the inside to the outside.
Foreign matter adhering to the outside of the filter element 19' is removed, and the filter element 19' is backwashed.

The removed sludge is transferred to the separating tube 16'
The liquid flows downward through the liquid guide 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 rotary shaft 27, and is discharged from the drain discharge hole 31 of the bearing cover 32. At this point, the valve of the air vent pipe 69 is in a closed state.

In this way, when the automatic backwashing of one filter element 19' is completed, the rotary shaft 27 is rotated via the intermediate shaft 34 by the rotary drive device 36 at the required angle (360°÷number of filter elements,
In this embodiment, the rotation is 45°).

The open portion 29 of the drain discharge hole 28 of the rotary shaft 27 communicates with the drain discharge passage 15' adjacent to the drain discharge passage 15', thereby stopping the inflow of fuel oil and allowing the outflow of sludge. At the same time, the flow path 53 of the rotating shaft 27 is opened [1 part;
I) 8 communicates with the communication passage 25 adjacent to the communication passage 25', and compressed air flows into the next filter element 19 for backwashing.

As mentioned above, after the backwashing of one filter element 19' with compressed air is completed, the rotary drive device 36 rotates the filter element 19'.
27, the space 14' of the drain discharge passage 15' and the opening 29 of the drain discharge hole 28 are disconnected, and the fuel oil in the wash chamber 8 is discharged from the drain discharge passage 15' and the drain passage 15'. The liquid enters the separating tube 15' through the liquid hole 13' and passes through the filter element 19' from the outside to the inside.

Further, due to the rotation of the rotation 111127, the opening 24' of the communication passage 25' and the opening 39 of the rotating shaft 27 are brought into communication, and the air that was filled in the filtration membrane 1-19' after air backwashing is removed. When the air vent pipe 69 is open, the air is pushed out from the hole 68 into the small chamber 54 through the communication path 25', the opening 39, the flow path 66, the flow path 64, and the flow path 65, and the air vent pipe 69
is discharged from. As a result, air remaining in the filter element 19' after air backwashing is discharged and replaced with fuel oil.

After the discharge of the residual air is completed, the valve of the air return pipe 69 is opened and the system is placed in a standby state.

It should be noted that the backwash filter of the present invention is not limited to the above-mentioned embodiments, and the shape of the casing may be any shape other than a cylinder. c51. Of course.

[Effects of the Invention] 1 As explained above, according to the backwash filter of the present invention,
The liquid to be filtered is filtered by flowing from the outside to the inside of the filtration element, and the backwashing air is flowed from the inside to the outside of the non-operating filtration element to perform backwashing for each filtration element in turn. can be carried out efficiently with a small amount of compressed air, the cleaning effect is increased by 1, and it exhibits various excellent effects such as becoming a compact automatic cleaning filter.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the backwash filter of the present invention,
Figure 2 is a partial explanatory diagram of the ■-■ direction in Figure 1, and Figure 3 is a partial explanatory diagram of the
1ll-1 direction arrow view in the figure, Figure 4 is IV- in Figure 1.
The IVh direction arrow view, FIG. 5 is an explanatory diagram showing an example of a conventional backwash type filter. 1 is a cylinder, 3 is an upper cover, 5 is a lower cover, 7 is a support body, 8 is a primary chamber, 9 is a secondary chamber, 10 is a liquid inlet, 11 L
; U liquid outlet, 13.13' is a liquid introduction hole, 15.15' is a drain discharge path, 16.16' is a separating tube, 17.17' is a communication hole, 18.18' is a communication pipe, 19
゜19' is the filter element. 21 is an upper support body, 25
25' is a communicating path, 27 is a rotating shaft, 28 is a drain outlet, 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, 52 is an N2 gas nozzle, 531 is a flow path,
54 is a small amount, 64, 65, 66 are channels, and 69 is a gas temporary tube.

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. and insert a backwashing air nozzle into the drain discharge hole,
Backwashing the first filtration element with backwashing air by communicating the air nozzle insertion portion with an opening provided in the upper support penetrating portion of the rotating shaft so as to be able to communicate with the first communication path. Further, a communication path that communicates with the opening provided in the upper support penetrating portion of the rotating shaft is connected to an adjacent communicating path, and air and filtered liquid are provided so as to surround the upper part of the rotating shaft. 1. A backwash filter, characterized in that a flow path for leading to the small chambers is bored in the rotating shaft, and an openable and closable air bleed pipe communicating with the small chambers is connected to the upper cover.