JPH04885Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in the backwashing function of an autofilter for fuel oil, etc., which has a backwashing function.

[Prior Art] Conventional autofilters for fuel oil and the like having a backwashing function include those shown in FIGS. 4 to 6.

A fuel oil inlet 2 and a fuel oil outlet 3 are provided in the upper part of the cylindrical casing 1 and at a position below the inlet, and both upper and lower openings of the casing 1 are closed with an upper cover 4 and a lower cover 5. The inside of the casing 1 is liquid-tightly partitioned by a partition plate 7 located between the inlet 2 and the outlet 3 and having a distribution hole 6 concentric with the casing. A support plate 9 is provided which is bored concentrically with the casing 1, and a large number of filter elements 10 are interposed between the partition plate 7 and the support plate 9. The filter element 10 has a donut-like shape, and a cylindrical space 11 is defined between the filter element 10 and the casing 1.

Further, the filter element 10 is divided as required in the circumferential direction (in this embodiment, divided into eight equal parts) to form a filtration chamber, and the filtration membranes 12 and 13 are provided at a required interval in the filtration chamber. . Furthermore, by stacking the filter elements 10 in multiple stages, filtration chambers 14a and 14b are defined by the filtration membranes 12 and 13. Further, an elongated opening 15 communicating with the filter chamber 14a is formed in the outer circumferential wall of the filter element 10, and semicircles 16 are cut out in the upper and lower edges of the inner circumferential wall. Note that the semicircle 16 has a through hole 17 that communicates with the filtration chamber 14b when the filter elements 10 are overlapped.
becomes.

A partition wall 18 that partitions the upper space and also serves as a bearing housing is fitted into the upper lid 4 in a fluid-tight manner.
8, the upper end of the distributor 19 is rotatably supported via a bearing 20, and the lower end is supported by the support plate 9.
is fitted.

The distributor 19 is provided with a valve part 21 that slides in liquid-tight contact with the circumferential surface of the filter element group at only one part except for the lower end, and a return path 22 that does not penetrate from the upper end is bored in the center of the valve part 21. Return route 22
A communication hole 23 bored through the sliding surface of the valve portion 21 communicates with the valve portion 21 . Further, a drive shaft 24 having a hollow lower end is fitted and connected to the upper end of the distributor 19, and the drive shaft 24 is rotatably fitted in a presser plate 25 of the bearing 20 in a fluid-tight manner. The drive shaft 24 is provided with a hole 26, which allows the return path 2
2 is a space 2 formed by the partition wall 18 and the upper lid 4;
7, and the space 27 is connected via a return port 28 to a fuel tank (not shown).

A jacket 29 is formed in the casing 1, and steam for heating fuel oil flows through the jacket 29.

Fuel oil 31 fed from the fuel tank is inlet 2
It flows into the casing, passes through the distribution hole 6, and reaches the center of the filter element group. Furthermore, through hole 17
It passes through the filtration chamber 14b, passes through the filtration membranes 12 and 13, and reaches the filtration chamber 14a. Filtration chamber 14a
The oil flows out through the opening 15 into the space 11, and most of the oil is delivered to the diesel engine through the outlet 3.

The inner wall of one row (in the vertical direction) of the filtration chambers 14a and 14b is in close contact with the valve part 21, and the filtration chamber 1
4b is a return path 22 via the through hole 17 and the communication hole 23.
Connect to. Clean oil in the space 11 enters the filtration chamber 14a through the opening 15, passes through the filtration membranes 12 and 13, and returns from the filtration chamber 14b through the communication hole 23 to the return path 2.
Flows to 2. Backwashing is performed when passing through this filtration membrane. The oil is discharged from the return path 22 through the hole 26 and the space 27 and from the return port 28 into the fuel tank.

If the distributor 19 is rotated intermittently or continuously via the drive shaft 24 described above, the filter membranes 12 and 13 in each row will be sequentially backwashed.

[Problems to be solved by the invention] However, in the above-mentioned autofilter, the entire row is backwashed at the same time, so the flow rate (flow rate) of the cleaning oil used to backwash each filtration membrane is small, making it difficult to ensure sufficient backwashing. The problem is that it is not effective.

[Means for Solving the Problems] The present invention was made to solve the above problems, and the casing has a donut shape inside which is divided as required in the circumferential direction and partitioned in the axial direction by a filtration membrane. An oil element group in which oil elements each having a filtration chamber are stacked in multiple stages is provided so that a space is formed around the periphery, and a filtration chamber is located in the center of the oil element group at each stage by means of through holes or openings provided in each oil element. The filtration chamber is communicated with the surrounding space at each stage by shifting the position from the side space, and the liquid to be treated is caused to flow through the oil element from the center side space toward the surrounding space, and is discharged to the outside of the surrounding casing. At the same time, a distributor having a rotating shaft center concentric with the oil element is disposed in the center side space, and only a valve portion protruding from the distributor comes into sliding contact with the inner circumferential surface of the oil element group, and a hole is formed in the valve portion. In the auto filter in which the return path provided in the center of the distributor is communicated with the through hole by a communication hole, a plurality of communication holes are provided in the valve portion and are staggered in a manner that they do not overlap in the circumferential direction and in the axial direction. The invention is characterized in that the through holes of the required number of stages are successively communicated with the communication holes by the rotation of the distributor.

[Function] The filtered liquid flows in the opposite direction from the surrounding space toward the center side space and backwashes the filtration membrane. Furthermore, by rotating the distributor, the matching point between the communication hole and the through hole is moved, and the filtration membrane being backwashed is changed.

[Example] Embodiments of the present invention will be described below based on the drawings.

In this embodiment, the backwashing function is particularly improved by improving the distributor, and the configuration other than the distributor is the same as that of the above-mentioned conventional example, so a description thereof will be omitted.

A valve portion 36 formed in the distributor 35 and in sliding contact with the inner circumferential surface of the filter element group has a spiral shape that extends approximately once around the entire length. Communication holes 37 that communicate the through holes 17 and the return path 22 are formed in the valve portion 36 in correspondence with the through holes 17 in each stage and shifted by a required angle for each stage.

For example, assuming that there are nine stages of the filtration chambers 14b, the communication holes 37 are bored at a pitch of each stage in the axial direction and at a pitch of 40° in the circumferential direction.

In this way, as shown in FIG.
7 and the communication hole 37, and all the stages complete communication by the time they are rotated by 45 degrees. Therefore, when the distributor 35 is rotated once, only one of the filtration chambers 14b in all rows and stages is communicated with the return path 22.

That is, in this embodiment, although the backwashing time is shortened, the flow rate of cleaning oil is nearly nine times greater per unit time, and the backwashing effect is significantly improved.

The circumferential pitch of the communicating holes 37 may be determined according to the circumferential pitch of the filtration chamber and the number of stages, and the angular difference between the two pitches is calculated by dividing the circumferential pitch angle of the filtration chamber by the number of stages. And it is sufficient.

Figure 3 shows another embodiment, in which multiple stages of oil elements are treated as one block for backwashing, and backwashing is performed for each block in sequence. (In this example, there are 5 blocks).

In this embodiment, the communication hole 38 is a long hole that communicates with the plurality of holes 17, and each communication hole 38
are shifted in the circumferential direction.

In the above embodiments, fuel oil was used as the liquid to be treated, but it is of course possible to filter other waste liquids.

[Effects of the invention] As described above, according to the invention, the amount of oil used to wash the filtration membrane is increased, so the backwashing effect is increased.
The life of the filter membrane can be extended.

[Brief explanation of drawings]

Fig. 1 is an elevational view showing the main parts of one embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the embodiment, Fig. 3 is a perspective view showing another embodiment, and Fig. 4 is a conventional example. FIG. 5 is a sectional view taken along the line A--A in FIG. 4, and FIG. 6 is a partial perspective view showing the relationship between the distributor and the filter element. 10 is a filter element, 11 is a space, 1
2 and 13 are filter membranes, 14a and 14b are filter chambers, 1
5 is an opening, 17 is a through hole, 19 is a distributor, 22 is a return path, and 37 and 38 are communicating holes.

Claims (1)

[Scope of utility model registration request] Inside the casing, there is a group of oil elements stacked in multiple stages, each having a donut-shaped oil element having a filtration chamber that is divided as required in the circumferential direction and partitioned in the axial direction by a filtration membrane, so that a space is formed around each oil element. The filtration chambers of each partition are communicated with the surrounding space of the oil element group by means of through holes or openings provided in the partitions, and the filtration chambers of each partition are communicated with the surrounding space, and the liquid to be treated is communicated with the center side space of the oil element group. The oil element is made to flow from the space toward the surrounding space and discharged to the outside of the surrounding casing, and a distributor having a rotating shaft center concentric with the oil element is disposed in the center side space, and a distributor is provided that projects from the distributor. In an autofilter, only the valve portion made to slide in sliding contact with the inner circumferential surface of the oil element group, and a communication hole formed in the valve portion communicates with a return path provided in the center of the distributor. , a plurality of communicating holes are formed in the valve portion so as to be staggered in the circumferential direction and in the axial direction so as not to overlap, and the required number of through holes are sequentially communicated with the communicating holes by rotation of the distributor. Auto filter.