JP6469198B1 - Filtration device - Google Patents

Abstract

Provided is a filtration device capable of reducing the number of pipes to reduce the installation space and ensuring the flow of backwash oil.
A pipe having a filtration device W1 for flowing a liquid 2 in a storage tank 1 into and out of a backwash-type main filter A; a pipe 43 for flowing the liquid 2 into and out of a subfilter B; A pipe 47 for allowing the backwash liquid of the main filter A to flow into the sub-filter B, and the pipe 42 is provided with a first valve 51 for controlling the inflow and stoppage of the liquid flowing into the main filter A. The pipe 43 is provided with a second valve 53 for controlling the inflow and inflow stop of the liquid to the sub-filter B, and a third valve 54 for controlling the outflow and out-flow stop of the liquid from the sub-filter B. The pipe 43b1 is provided with a pipe 63 for allowing the liquid flowing out from the sub-filter B to flow out and into the pipe 42, and the pipe 47 sucks up the backwash liquid of the main filter A, A pump 7 that flows into the filter B is provided.
[Selection] Figure 1

Description

  The present invention relates to a filtering device, for example, a filtering device that filters liquid such as lubricating oil supplied to marine equipment.

  DESCRIPTION OF RELATED ART Conventionally, the filtration apparatus mounted on a ship and filtering the lubricating oil etc. which the equipment of a ship supplies is known. For example, Patent Document 1 proposes a configuration having a backwash-type main filter and a sub-filter as a filtering device that filters lubricating oil and the like supplied by marine equipment. In the normal filtering operation, this filtering device filters the lubricating oil with the main filter, and at the same time, the subfilter removes the liquid (backwash oil) discharged by the back washing of the main filter. It is configured to filter. Here, the configuration of the filtration device described in Patent Document 1 will be briefly described with reference to FIG.

As shown in the figure, the filtering device W2 includes a pump 3 that sucks up the lubricating oil 2 stored in the storage tank 1, a backwash-type main filter A, and a sub-filter installed in parallel with the main filter A. B.
The filtration device W2 includes a pipe 40 that connects the storage tank 1 and the pump 3, a pipe 41 that has one end connected to the pump 3 and causes the lubricating oil 2 sucked up by the pump 3 to flow out of the pump 3, and a pump. The lubricating oil 2 sucked up by the pump 3 flows into the main filter A and flows out from the main filter A (first pipe) 42, and the lubricating oil 2 sucked up by the pump 3 flows into the sub-filter B and flows into the sub-filter B. And a pipe (second pipe) 43 that flows out from the filter B.
The pipe 41 is connected to the pump 3 at one end, and is branched in the middle to be divided into two paths (pipe), and one of the two paths (pipe) is connected to one end of the pipe 42. Is connected to one end of the pipe 43.

  In addition, the other end of the pipe 42 and the other end of the pipe 43 are joined (joined), and a pipe (equipment connecting pipe) 44 connected to the device 6 is connected to the joined part. . The device 6 and the storage tank 1 are connected by a pipe (discharge pipe) 45.

The first pipe 42 is connected to the main filter A, and has a first valve (open / close valve) 51 for controlling the inflow and stoppage of the lubricating oil 2 to the main filter A; A fourth valve (open / close valve) 52 for controlling the outflow and outflow stoppage of the lubricating oil 2 (filtered lubricating oil 2) from the filter A is provided.
The second pipe 43 is connected to the sub-filter B, and has a second valve (open / close valve) 53 for controlling the inflow and stoppage of the lubricating oil 2 to the sub-filter B, and the sub-filter B. A third valve (open / close valve) 54 for controlling the outflow and outflow stop of the lubricating oil 2 (filtered lubricating oil 2) from the filter B is provided.

  Further, the filtering device W2 includes a pipe (third pipe) 47 for allowing the backwash oil flowing out from the main filter A to flow between the second valve 53 and the sub filter B, the sub filter B, and the third filter. A pipe 48 for discharging the lubricating oil 2 (filtered lubricating oil 2) from the sub-filter B to the storage tank 1 from between the valve 54 and the valve 54 is provided. The pipe 48 is provided with a fifth valve (open / close valve) 55 that controls the outflow and outflow stop of the lubricating oil 2 (filtered lubricating oil 2) from the sub-filter B.

  In the normal filtration operation, the filtration device W2 opens the first valve 51, the fourth valve 52, and the fifth valve 55, and closes the second valve 53 and the third valve 54. The sucked lubricating oil 2 flows into the main filter A and is filtered and discharged by the main filter A, and the backwash liquid (backwash oil) of the main filter A flows into the subfilter B and is subfiltered. It is configured to be filtered by the vessel B and to flow out to the storage tank 1 through the pipe 48. Further, the lubricating oil 2 filtered and discharged by the main filter A flows from the pipe 42 to the pipe 44 and is supplied to the device 6. The lubricating oil 2 used in the device 6 is discharged to the storage tank 1 through the pipe 45.

  In addition, when the emergency condition occurs in the main filter A, when the main filter A is washed, or when the lubricant flushing during the initial operation of the device 6 is performed, the above-described filtering device W2 includes the second valve 53 and The third valve 54 is opened, and the first valve 51, the fourth valve 52, and the fifth valve 55 are closed. In this case, the lubricating oil 2 sucked up from the storage tank 1 flows into the subfilter B, is filtered by the subfilter B, flows out, and then flows from the pipe 43 to the pipe 44 to be supplied to the device 6. Is done. In this case as well, the lubricating oil 2 used in the device 6 flows out to the storage tank 1 through the pipe 45.

  Thus, in said filtration apparatus W2, the liquid (backwashing liquid) discharged | emitted by the backwashing of the main filter A is filtered by the subfilter B provided in parallel with the backwashing type main filter A. Thus, the sub-filter B that is not used in the normal filtration process can be effectively used. Moreover, since the back liquid (backwash oil) containing the foreign material caught and removed by the main filter A is filtered by the sub filter B and then returned to the storage tank 1, the sub filter B is a purifier. It will also take on the function. Therefore, the lubricating oil 2 in the storage tank 1 can be cleaned without installing a purifier in the storage tank 1. Moreover, since it is not necessary to install a purifier, the cost of the filtering device W2 can be reduced.

Japanese Patent No. 4225997

By the way, since the backwash oil of the filtration device W2 as described above is an oil that generally does not have pressure, a configuration in which the backwash oil naturally flows out to the storage tank 1 must be employed. The pipe (in the example of FIG. 3, the sub-filter B) and a pipe (pipe 48 in the example of FIG. 3) connecting the storage tank 1 are provided, and backwash oil is discharged to the storage tank 1 through this pipe. .
However, the storage tank 1 is generally installed at a position distant from the filtration device W2, and in many cases, a long distance pipe (the filtration device W2 and the storage device is installed inside a ship with limited space). Piping connecting the tank 1) was installed, and the piping was in the way in the ship. Therefore, it is required to reduce the number of pipes connecting between the storage tank 1 and the filtration device W2, and to make the entire filtration system including the storage tank 1 and the filtration device W2 compact, There is no known filter device configured to reduce the number of pipes between the storage tank 1 and the filter device W2.

  Further, in the filtering device W2 as described above, the backwash oil flows out using the pressure difference between the main filter A in use and the sub-filter B in standby. However, when the hydraulic pressure of the lubricating oil sent from the storage tank 1 to the main filter A is low, or when the filter B is clogged, the above pressure difference disappears and the backwash oil flows out. There is also a technical problem that it cannot be done. In such a case, the main filter A cannot be backwashed, and the filtration capacity of the main filter A is reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a filtration device having a backwash-type main filter and a sub-filter. An object of the present invention is to provide a filtration device that can be downsized and can ensure the flow of backwash liquid.

The present invention, which has been made to solve the above problems, is a filtration device having a backwash-type main filter and a sub-filter arranged in parallel with the main filter, wherein the liquid in the storage tank is supplied to the main filter. A first pipe that flows into the filter and flows out from the main filter; a second pipe that allows the liquid in the storage tank to flow into the subfilter and out of the subfilter; and flows out from the main filter A third pipe for allowing the backwash liquid to flow into the sub-filter, and the first pipe is provided with a first valve for controlling the inflow and stoppage of the liquid into the main filter. The second pipe is provided with a second valve for controlling the inflow and stoppage of the liquid to the subfilter and a third valve for controlling the outflow and outflow stop of the liquid from the subfilter. In the portion of the second pipe between the subfilter and the third valve, the subfilter A fourth pipe is provided for allowing the discharged liquid to flow out and for allowing the discharged liquid to flow into the first pipe. The third pipe sucks up the backwash liquid of the main filter, and A pump is provided to flow into the sub-filter, and during the normal filtering operation, the first valve is opened and the second and third valves are closed to allow the liquid in the storage tank to flow into the main filter. The main filter is filtered and discharged, and the pump is sucked up the backwash liquid of the main filter, flows into the subfilter and is filtered by the subfilter, and the filtered backwash liquid is It is configured to flow into the main filter via a fourth pipe and the first pipe.
Further, the pump has a predetermined pressure at which the pressure of the backwash liquid flowing out from the main filter to the subfilter is higher than the pressure of the main filter, and the backwash liquid from the main filter. It is desirable to suck up and flow out to the subfilter.

Thus, the present invention is provided with a pump that sucks backwash liquid from the main filter and flows it into the subfilter. In the present invention, a fourth pipe is provided for allowing the liquid that has flowed out of the sub-filter to flow out and for allowing the liquid that has flowed out to flow into the first pipe.
And when the filtration apparatus of this invention is used for filtration of the lubricating oil etc. of an apparatus like the prior art mentioned above, the following effects are obtained.

  Specifically, in the present invention, the pressure of the sub-filter is made higher than the pressure of the main filter by the structure of the pump that sucks up the backwash liquid of the main filter and flows into the sub-filter. Can do. Therefore, the backwash oil filtered by the subfilter returns to the main filter via the fourth pipe and the first pipe due to the pressure difference between the main filter and the subfilter. As a result, according to the present invention, the “pipe for allowing the backwash oil to flow into the storage tank” as in the prior art described above becomes unnecessary, and the filtration device and the storage tank are installed inside the ship where space is limited. The number of pipes between the storage tank and the filtration system including the storage tank and the filtration device can be reduced.

  Further, according to the present invention, even when the oil pressure of the lubricating oil sent from the storage tank to the main filter is low, or when the filter element (filter) of the sub-filter is clogged, By suction, backwash oil can flow out from the main filter to the sub-filter. That is, by providing this pump, it is possible to prevent the occurrence of a phenomenon in which backwash oil does not flow out into the subfilter under any pressure condition and the main filter cannot be backwashed. The filtration capacity of the vessel can be maintained.

Further, the present invention is a filtration device having a backwash-type main filter and a sub-filter arranged in parallel with the main filter, the first pump sucking up the liquid stored in the storage tank, A pump connection pipe for letting out the liquid sucked up by the first pump, and one end of which is connected to the pump connection pipe, and the liquid sucked up by the first pump flows into the main filter and flows out from the main filter. A first pipe that has one end connected to the pump connection pipe, and a second pipe that causes the liquid sucked up by the first pump to flow into the sub-filter and out of the sub-filter, One end of the pump connection pipe is connected to the first pump, and is branched in the middle to be divided into two pipes, and one of the two pipes is connected to one end of the first pipe. Is connected to one end of the second pipe. The first pipe is provided with a first valve for controlling the inflow and stoppage of the liquid to the main filter, and the second pipe has an inflow and an inflow of liquid to the subfilter. A second valve for controlling the stop and a third valve for controlling the outflow and outflow stop of the liquid from the sub-filter are provided, and the backwash liquid flowing out of the main filter is further supplied to the second filter. A third pipe is provided to flow into a part of the pipe between the second valve and the sub-filter, and from a part of the second pipe between the sub-filter and the third valve. A fourth pipe is provided for allowing the liquid that has flowed out from the subfilter to flow out and to flow into the portion between the one end of the second pipe and the second valve. In the third pipe, the backwash liquid of the main filter is sucked up, A second pump is provided, and during the normal filtration operation, the first valve is opened and the second and third valves are closed, and the first pump sucks liquid out of the storage tank, Into the filter, filtered by the main filter and discharged, and backwashed liquid of the main filter is sucked up by the second pump and flows into the subfilter and filtered by the subfilter. The filtered backwash liquid flows into the main filter through the fourth pipe, the pump connection pipe, and the first pipe.
Moreover, it is desirable that an orifice is provided in the other of the two pipes branched and divided in the middle of the pump connection pipe.

  According to the present invention, a filtering device having a backwashing type main filter and a subfilter, the number of pipes can be reduced, the device itself can be miniaturized, and the flow of backwashing liquid is ensured. It is possible to provide a filtration device that can be used.

It is the schematic diagram which showed the whole structure of the filtration apparatus of this embodiment, and is the schematic diagram which showed the flow of the lubricating oil at the time of normal filtration operation | movement. It is a schematic diagram showing the overall configuration of the filtration device of the present embodiment, showing the flow of lubricating oil during the filtration operation when the main filter is not used due to the occurrence of an emergency in the main filter, etc. It is a schematic diagram. It is the schematic diagram which showed the whole structure of the filtration apparatus of a prior art.

Hereinafter, the filtration device of an embodiment of the present invention is explained based on a drawing.
In addition, since the filtration apparatus of this embodiment is an improvement of the above-described “prior art filtration apparatus W2” shown in FIG. 3, the same reference numerals are used for the same configuration (or corresponding configuration) as the above-described conventional technique. Is attached.

First, the configuration of the filtration device W1 of the present embodiment will be described with reference to FIG.
FIG. 1 is a schematic diagram showing the overall configuration of the filtration device of the present embodiment, and is a schematic diagram showing the flow of lubricating oil during a normal filtration operation.
The filtration device W1 of the present embodiment is used, for example, for filtering the lubricating oil 2 used in the equipment 6 mounted on the ship. The filtering device W1 sucks up the lubricating oil 2 from the storage tank 1 in which the dirty lubricating oil 2 used in the device 6 is stored and filters the foreign oil to remove the foreign oil. It comes to supply. In addition, the apparatus 6 discharges | emits the lubricating oil 2 which became dirty by use to the storage tank 1. FIG. That is, in the present embodiment, the lubricating oil 2 is circulated among the storage tank 1, the filtering device W1, and the device 6.

  Specifically, as shown in FIG. 1, the filtering device W1 includes a pump (first pump) 3 that sucks up the lubricating oil (liquid) 2 stored in the storage tank 1, similarly to the filtering device W2 of the prior art, It has a backwash-type main filter A and a sub-filter B installed in parallel with the main filter A.

  The main filter A is a so-called backwash filter, an inlet A1 into which the lubricating oil 2 flows, a plurality of filtering elements (filter elements) that are filters such as a filter screen for filtering the lubricating oil 2, and a filtering element. And an outlet A2 from which the lubricating oil 2 filtered out flows out and a backwashing liquid outlet A3 from which the backwashing liquid (backwashing oil) shown below flows out.

In addition, the main filter A has a part of the filter elements (for example, one filter element) in the plurality of filter elements (for example, five filter elements), and another filter element (for example, the remaining four filter elements). It has a self-backwashing structure in which the clean lubricating oil 2 filtered in step 1 is introduced in the direction opposite to the normal flow to wash the part of the filter elements. In this self-backwashing structure, the filtration elements are washed by sequentially replacing some of the filtration elements to be washed. Although the filtration accuracy of the filtration element of the main filter A is appropriate, for example, 25 to 50 μm is preferable, and 40 to 50 μm is more preferable.
In addition, since said self-backwash structure is a well-known technique, description of a specific structure is abbreviate | omitted.

The sub-filter B provided in parallel with the main filter A includes an inlet B1 into which the lubricating oil 2 flows, a filtering element (filter element) that is a filter for filtering the lubricating oil 2, and a filtering element. And an outlet B2 through which the lubricating oil 2 is discharged.
The filter element of the subfilter B is, for example, a replaceable cartridge type disposable element. Moreover, although the filtration accuracy of the filter element of the subfilter B is appropriate, for example, 5 to 20 μm is preferable, and 10 to 20 μm is more preferable.

The filtration device W1 includes a pipe (pump connection pipe) 40 for connecting the storage tank 1 and the pump 3, and a pipe (pump connection pipe) 41 for causing the lubricating oil 2 sucked up by the pump 3 to flow out from the pump 3. The lubricating oil 2 sucked up by the pump 3 flows into the main filter A and flows out from the main filter A (first piping) 42, and the lubricating oil 2 sucked up by the pump 3 flows into the sub-filter B And a pipe (second pipe) 43 that flows out from the sub-filter B.
Here, the pipe 41 is connected to the pump 3 at one end and is branched into two paths (two pipes: a pipe 41b1 and a pipe 41b2) by being branched by a branch part 41a provided in the middle. The end portion of the pipe 41b1 forming the pipe is connected to one end of the pipe 42, and the end section of the pipe 41b2 forming the other of the two paths is connected to one end of the pipe 43.
In addition, the other end of the pipe 42 and the other end of the pipe 43 are joined (joined), and a pipe (equipment connecting pipe) 44 connected to the device 6 is connected to the joined part. . The device 6 and the storage tank 1 are connected by a pipe (discharge pipe) 45.

The pipe 42 is connected to the main filter A, and has a first valve (open / close valve) 51 for controlling the inflow and stoppage of the lubricating oil 2 to the main filter A, and the main filter. A fourth valve (open / close valve) 52 that controls the outflow and outflow stop of the lubricating oil 2 (filtered lubricating oil 2) from A is provided.
Specifically, the pipe 42 includes “a pipe 42 a having one end connected to the pipe 41 b 1 and the other end connected to the inlet A 1 of the main filter A” and “an outlet A 2 of the main filter A at one end. , And the other end is connected to the pipe 44 b ”. A first valve 51 is provided on the pipe 42a, and a fourth valve 52 is provided on the pipe 42b. Thus, the piping 42 is provided with the first valve 51 and the fourth valve 52 before and after the main filter A.

The pipe 43 is connected to a sub-filter B, a second valve (open / close valve) 53 for controlling the inflow and stoppage of the lubricating oil 2 to the sub-filter B, and a sub-filter. A third valve (open / close valve) 54 for controlling the outflow and outflow stop of the lubricating oil 2 (filtered lubricating oil 2) from B is provided.
Specifically, the pipe 43 includes “a pipe 43 a having one end connected to the pipe 41 b 2 and the other end connected to the inlet B 1 of the sub-filter B” and “an outlet B 2 of the sub-filter B at one end. , And the other end is connected to the pipe 44. And the 2nd valve | bulb 53 is provided in the piping 43a, and the 3rd valve | bulb 54 is provided in the piping 43b. Thus, in the pipe 43, the second valve 53 and the third valve 54 are provided before and after the auxiliary filter B.

In the present embodiment, the backwash oil flowing out from the backwash liquid outlet A3 of the main filter A (the lubricating oil 2 used in the self-backwash washing) is used as the second valve 53 and the subfilter B. A pipe 47 (third pipe) is provided to flow in between (a pipe 47 for allowing backwash oil to flow into the sub-filter B is provided).
Specifically, the pipe 47 has one end connected to the backwashing liquid outlet A3 of the main filter A, and the other end “the portion between the second valve 53 and the subfilter B in the pipe 43a. (Piping 43a2) ".

Further, the backwash oil filtered by the sub-filter B (the lubricating oil 2 used in the self-backwash cleaning) is returned to the main filter A during the normal filtering operation (inflow). )) (Fourth piping) 63 is provided.
Specifically, one end of the pipe 63 is connected to the “part of the pipe 43b between the outlet B2 of the sub-filter B and the third valve 54 (pipe 43b1)” and the other end is “the pipe 43a. It is connected to a part (pipe 43a1) between one end (connecting part to the pipe 41b2) and the second valve 53 ". Note that one end of the pipe 63 may be directly connected to the outlet B2 of the sub-filter B.
The pipe 63 is provided with a fifth valve (open / close valve) 56 for controlling the outflow and outflow stop of the lubricating oil 2 (filtered lubricating oil 2) from the sub-filter B.

Further, the pipe 47 (third pipe) through which the backwash oil flowing out from the backwash liquid outlet A3 of the main filter A described above flows between the second valve 53 and the subfilter B is connected to the main filter A. There is provided a pump (second pump) 7 for sucking up the backwash oil of the filter A (the lubricating oil 2 used in the self-backwash washing) and flowing it into the subfilter B.
By providing this pump 7, even when the oil pressure of the lubricating oil 2 sent from the storage tank 1 to the main filter A is low, or when the filter element of the sub-filter B is clogged, The lubricating oil 2 can flow out from the filter A to the subfilter B. That is, the provision of the pump 7 can prevent the occurrence of the phenomenon that the backwash oil 2 does not flow out into the subfilter B under any pressure condition and the main filter A cannot be backwashed. The filtration capacity of the main filter A can be maintained.

Further, the pump 7 of the present embodiment is driven at the time of “normal filtration operation”, and is used for backwash oil flowing out from the main filter A to the subfilter B (used in self-backwashing washing). Further, the backwash liquid is sucked up from the main filter A and flows out to the sub-filter B so that the pressure of the lubricating oil 2) becomes higher than the pressure of the main filter A.
Of the pipes 41 described above, an orifice 70 is provided in the other pipe 41b2 of the two pipes (pipe 41b1 and pipe 41b2) branched at the branch portion 41a. The orifice 70 is generally used for flow rate adjustment, but in this embodiment, it functions as pressure adjustment. Specifically, the orifice 70 provided in the pipe 41b2 adjusts the pressure of the pipe 41 so that the pressure of the pipe 41b2 is higher than the pressure of the pipe 41b1 during the “normal filtering operation”. It is like that.

According to the above configuration, during the “normal filtration operation”, the backwash oil filtered by the subfilter B (the lubricating oil 2 used for self-backwashing) is separated from the main filter A and the subfilter. Due to the pressure difference with the filter B, it flows again into the main filter A through the path of “pipe 63 → pipe 43a1 → pipe 41b2 → pipe 41b1 → pipe 42a”.
As a result, according to the present embodiment, unlike the above-described prior art, a pipe (pipe 48 shown in FIG. 3) for allowing the backwash oil to flow into the storage tank 1 becomes unnecessary, and the filtration device W1 and the storage tank The number of pipes between the filter 1 and the filter device W1 itself can be reduced.

  Subsequently, the filtering operation of the filtering device W1 of the present embodiment will be described separately as “normal filtering operation” and “filtering operation without using a main filter”.

  First, the “normal filtration operation” of the filtration device W1 will be described with reference to FIG.

  When performing a normal filtration operation, the filtration device W1 is set as follows. Specifically, the first valve 51, the fourth valve 52, and the fifth valve 56 are set in an open state (open state), and the second valve 53 and the third valve 54 are closed (closed state). Set. Further, the pump 3 and the pump 7 are driven.

  Then, the lubricating oil 2 stored in the storage tank 1 is sucked up by driving the pump 3, and the sucked lubricating oil 2 flows into the main filter A. Specifically, the lubricating oil 2 stored in the storage tank 1 is sucked up from the storage tank 1 by the pump 3, flows into the pump 3 through the pipe 40, flows into the pipe 41 through the pump 3, After that, it flows into the pipe 42a through the pipe 41b1, passes through the first valve 51 in the open state provided in the pipe 42a, and flows into (introduces) the main filter A from the inlet A1 of the main filter A.

  Further, the lubricating oil 2 that has flowed into the main filter A from the pipe 42 is filtered by most of the filtering elements in the main filter A to remove foreign matters, and most of the filtered lubricating oil 2 is It flows out from the outlet A2 to the pipe 42b, flows through the fourth valve 52 in the open state provided in the pipe 42b, flows into the pipe 44, and is introduced into the device 6. Further, the lubricating oil 2 introduced into the device 6 is used in the device 6, and the lubricating oil 2 that has become dirty due to the use is discharged from the device 6 through the pipe 45 to the storage tank 1.

  Further, in the main filter A, a part of the filtered lubricating oil 2 flows into a part of the filtering element to be cleaned in a direction opposite to the normal direction so that the part of the filtering element is cleaned. And some filter elements are washed (backwashed). The lubricating oil 2 contaminated by this backwashing is sucked up by the pump 7 at a predetermined pressure, flows out from the backwashing liquid outlet A3 to the pipe 47, and is sent to the pipe 43a2 between the second valve 53 and the filter B. It is done. At this time, since the second valve 53 is in the closed state, the backwash oil (lubricating oil 2) flowing into the pipe 43a2 between the second valve 53 and the filter B is supplied from the pipe 43a2 to the sub-filter. Introduced into B.

Then, the backwash oil (lubricant 2) introduced into the sub-filter B is filtered and cleaned by the sub-filter B. Thereafter, the filtered lubricating oil 2 is discharged from the outlet B2 of the sub-filter B to the pipe 43b1. At this time, since the third valve 54 is in a closed state and the fifth valve 56 is in an open state, the filtered and discharged lubricating oil 2 flows out through the pipe 63 to the pipe 43a1.
Here, the pressure of the filter B becomes higher than the pressure of the main filter A due to the drive of the pump 7 and the pressure adjustment function of the orifice 70 provided in the pipe 41b2. As a result, the pressure of the pipe 41b2 becomes higher than the pressure of the pipe 41b1. For example, when the pump 7 is a metering pump, the pressure adjustment for setting the pressure of the filter B higher than the pressure of the main filter A can be made particularly easy.

Also, the lubricating oil 2 (lubricating oil 2 filtered and purified by the filter B) flowing out to the pipe 43a1 is caused by the "pipe 41b2 and pipe 41b1" due to the pressure difference between the main filter A and the sub-filter B. Through the pipe 42a and into the main filter A.
Since the pressure of the pipe 41b2 is higher than the pressure of the pipe 41b1 due to the orifice 70, the lubricating oil 2 flowing into the pipe 41b2 from the pipe 43a1 (filtered and purified by the sub-filter B) The backwash oil (lubricating oil 2) smoothly joins the lubricating oil 2 sucked up from the storage tank 1 by the pump 3 at the branching portion 41a of the pipe 41.

Next, the “filtration operation without using the main filter A” of the filtration device A will be described with reference to FIG.
Here, FIG. 2 is a schematic diagram showing the overall configuration of the filtration device of the present embodiment, and during the filtration operation when the main filter is not used due to an emergency occurring in the main filter or the like. It is the schematic diagram which showed the flow of the lubricating oil.
Note that “when the main filter A is not used” means that when an emergency situation occurs in the main filter A, when the main filter A is washed, or when lubricating oil flushing during the initial operation of the device 6 is performed. And so on.

  When performing the filtration operation without using the main filter A, the filtration device W1 is set as follows. Specifically, the first valve 51, the fourth valve 52, and the fifth valve 56 are set in a closed state (closed state), and the second valve 53 and the third valve 54 are opened (open state). Set. Further, the pump 3 is driven and the pump 7 is stopped.

Then, the lubricating oil 2 stored in the storage tank 1 by the drive of the pump 3 is sucked up from the storage tank 1 and flows into the pump 3 through the pipe 40, flows into the pipe 41 through the pump 3, and then , Flows into the pipe 43, passes through the open second valve 53, and flows into (introduces) the sub-filter B from the inlet B 1 of the sub-filter B.
The lubricating oil 2 that has flowed into the sub-filter B is filtered by the sub-filter B and then discharged from the outlet B2 of the filter B to the pipe 43b1 between the filter B and the valve 54. At this time, since the third valve 54 is in the open state and the fifth valve 56 is in the closed state, the filtered and discharged lubricating oil 2 flows into the pipe 44 through the open valve 54 and is 6 is supplied. In this case as well, the lubricating oil 2 used in the device 6 flows out to the storage tank 1 through the pipe 45.

As described above, in this embodiment, the pump 7 is provided, and during normal filtration operation, the pump 7 sucks back washing oil (the lubricating oil 2 used in self-back washing) by sucking the sub-washing oil. It is configured to flow into the filter B. With this configuration (driving the pump 7), the pressure of the sub-filter B can be made higher than the pressure of the main filter A.
Therefore, in this embodiment, the backwash oil filtered by the subfilter B (the lubricating oil 2 used in the self-backwash cleaning) is “pipe 63” due to the pressure difference between the main filter A and the subfilter B. → the pipe 43a1 → the pipe 41b2 → the pipe 41b1 → the pipe 42a ”can be re-inflowed into the main filter A.
In the present embodiment, the pressure in the pipe 41b2 is higher than the pressure in the pipe 41b1 due to the orifice 70 provided in the pipe 42b2. Therefore, during the “normal filtering operation”, the lubricating oil 2 (the backwash oil (lubricating oil that has been filtered and cleaned by the sub-filter B) and flows into the piping 41b2 from the piping 43a1 at the branching portion 41a of the piping 41). 2)) and the lubricating oil 2 sucked up from the storage tank 1 by the pump 3 can be smoothly joined.
As a result, in the present embodiment, the “pipe for flowing backwash oil into the storage tank 1” as in the above-described prior art becomes unnecessary, and it is installed at a distant position inside the ship where space is limited. It is possible to reduce the number of pipes that connect the water storage tank 1 and the filtration device W1 that are often used. Moreover, since the “pipe for allowing the backwash oil to flow into the storage tank 1” becomes unnecessary, the filtration system including the water storage tank 1 and the filtration device W1 can be made compact.

  Further, by providing the pump 7, when the hydraulic pressure of the lubricating oil 2 sent from the storage tank 1 to the main filter A is low, or when the filter element of the sub-filter B is clogged, Lubricating oil 2 can flow out from the main filter A to the subfilter B. That is, by providing the pump 7, it is possible to prevent the phenomenon that the backwash oil 2 does not flow out to the subfilter B and the main filter A cannot be backwashed. Ability can be maintained.

  As described above, according to the present embodiment, the filtering device W1 includes the backwash type main filter A and the subfilter B, and the size of the device itself can be reduced by reducing the number of pipes. At the same time, it is possible to provide the filtration device W1 that can ensure the flow of the backwash liquid.

In addition, this invention is not limited to the said embodiment, A various change is possible within the range of the summary.
For example, in the above-described embodiment, the case where the filtering device W1 filters the lubricating oil 2 has been described. However, for filtering liquids other than the lubricating oil 2 (for example, liquids such as fuel oil, seawater, washing water, and cooling water). It may be used.

W1 ... Filtration device A ... Main filter A1 ... Inlet (main filter)
A2 ... Outlet (main filter)
A3 ... Backwash outlet (main filter)
B ... Sub-filter B1 ... Inlet (sub-filter)
B2 ... Outlet (subfilter)
DESCRIPTION OF SYMBOLS 1 ... Storage tank 2 ... Lubricating oil 3 ... Pump 7 ... Pump

40 ... Piping (pump connection piping)
41 ... Piping (pump connection piping)
41a ... Branch (pump connection piping)
41b1, 41b2 ... piping (pump connection piping)
42 ... Piping (first piping)
42a, 42b ... piping (first piping)
43 ... Piping (second piping)
43a, 43a1, 43a2, 43b, 43b1 ... piping (second piping)
44 ... Piping 45 ... Piping 47 ... Piping 63 ... Piping

51 ... First valve 52 ... Fourth valve 53 ... Second valve 54 ... Third valve 56 ... Fifth valve

70: Orifice

Claims (4)

A filtration device comprising a backwash-type main filter and a sub-filter arranged in parallel with the main filter,
A first pipe that causes the liquid in the storage tank to flow into and out of the main filter;
A second pipe for allowing the liquid in the storage tank to flow into the sub-filter and out of the sub-filter;
A third pipe for allowing the backwash liquid flowing out from the main filter to flow into the sub-filter,
The first pipe is provided with a first valve for controlling the inflow and stoppage of the liquid into the main filter,
The second pipe is provided with a second valve that controls the inflow and stoppage of the liquid flowing into the subfilter, and a third valve that controls the outflow and outflow stop of the liquid from the subfilter,
The liquid that has flowed out from the sub-filter is caused to flow out into the portion between the sub-filter and the third valve in the second pipe, and the liquid that has flowed out flows into the first pipe. A fourth pipe is provided,
The third pipe is provided with a pump for sucking back washing liquid of the main filter and flowing it into the sub-filter,
During normal filtration operation, the first valve is opened and the second and third valves are closed, and the liquid in the storage tank is flowed into the main filter and filtered through the main filter. The pump sucks up the backwash liquid of the main filter, flows into the subfilter and is filtered by the subfilter, and the filtered backwash liquid passes through the fourth pipe and the first pipe. The filtration device is configured to flow into the main filter.   The pump sucks up the backwash liquid from the main filter at a predetermined pressure at which the pressure of the backwash liquid flowing out from the main filter to the subfilter is higher than the pressure of the main filter. The filtration device according to claim 1, wherein the filtration device is allowed to flow out to the sub-filter. A filtration device comprising a backwash-type main filter and a sub-filter arranged in parallel with the main filter,
A first pump for sucking up the liquid stored in the storage tank;
A pump connection pipe for discharging the liquid sucked up by the first pump;
A first pipe having one end connected to the pump connection pipe and allowing the liquid sucked up by the first pump to flow into the main filter and out of the main filter;
A second pipe having one end connected to the pump connection pipe and allowing the liquid sucked up by the first pump to flow into the subfilter and out of the subfilter;
One end of the pump connection pipe is connected to the first pump, and is branched in the middle to be divided into two pipes. One of the two pipes is connected to one end of the first pipe. The other of the pipes is connected to one end of the second pipe,
The first pipe is provided with a first valve for controlling the inflow and stoppage of the liquid into the main filter,
The second pipe is provided with a second valve that controls the inflow and stoppage of the liquid flowing into the subfilter, and a third valve that controls the outflow and outflow stop of the liquid from the subfilter,
Furthermore, a third pipe is provided for allowing the backwash liquid flowing out from the main filter to flow into a portion of the second pipe between the second valve and the sub-filter,
A liquid from the sub-filter is caused to flow out from a portion between the sub-filter and the third valve in the second pipe, and the one end portion and the second valve in the second pipe; A fourth pipe through which the liquid that has flowed out of the sub-filter is introduced into a portion between
The third pipe is provided with a second pump that sucks up the backwash liquid of the main filter and flows it into the sub-filter,
In the normal filtration operation, the first valve is opened and the second and third valves are closed, and the first pump sucks liquid from the storage tank and flows it into the main filter. The second pump pumps up the backwash liquid of the main filter, flows into the subfilter and is filtered by the subfilter, and the filtered backwash liquid is filtered by the second pump. A filtration device characterized in that it flows into the main filter via four pipes, the pump connection pipe and the first pipe.   The filtration apparatus according to claim 3, wherein an orifice is provided in the other of the two pipes branched and divided in the middle of the pump connection pipe.

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