KR20190017023A - A filtration system for filtering oil for marine machinery, especially marine engines - Google Patents

Abstract

The present invention relates in particular to a filtration system for filtering lubrication of a marine engine for a marine engine, characterized in that the filtration system comprises an oil supply reservoir (2), a backflush in the main flow branch (10) The filter housing 12 of the main flow filter 11 and the filter housing 12 of the secondary flow filter 31 have a main flow filter 11, a secondary flow filter 31 in the secondary flow circuit 30, Each having an inlet and an outlet, and the filter housing 12 of the main flow filter has at least one outlet 16 for the backflushing body. At least one switching valve (7, 8; 207) is connected upstream of the inlet (20) so that the oil can be selectively supplied to the ship machine unit (s) via the main flow branch (10) or the secondary flow circuit (13, 33). In order to improve the general filtration system, the outlet 16 for the backflushing fluid is connected to the inlet 33 of the secondary flow filter 31 through a secondary branch 20 where the pump 21 is provided and / And is connected to the storage unit 2.

Description

A filtration system for filtering oil for marine machinery, especially marine engines

The present invention relates to a filtration system for filtration of oil, in particular a lubricious oil, for a marine machinery unit such as a marine engine, the filtration system comprising an oil supply reservoir, a reservoir for oil between the supply reservoir and the marine mechanical unit A secondary flow filter having a filter housing in a secondary flow circuit for oil and a switchable switching valve having a filter housing in the main flow filter and a filter element in the filter housing in the main flow filter, Each of the filter housings of the secondary flow filter having an inlet and an outlet and wherein the filter housing of the main flow filter has at least one outlet for the backflushing body and wherein the oil is selectively supplied to the downstream In order to be able to be supplied to the marine vessel unit (s), at least one switching valve is connected upstream Port and is coupled to the inlet for the secondary flow filter.

The filtration system of the ship protects the marine machinery connected to this filtration system. [0002] Oil-fired systems in ships are used particularly in ship engines used to propel ships, such as lubricant circuits, particularly for large diesel engines. In this case there are many requirements for filtration systems because of the need to filter large amounts of flow, since in some cases ships navigate for days or weeks in a state where they can not be held at the port, so much of the contaminants of lube oil or hydraulic oil And at the same time, problem-free operation of the filtration system is required over a long period of time even at extreme or extreme fluctuating temperatures and pressures. The manufacturer of the marine engine therefore specifies the cleanliness that must be adhered to by such a filtration system, since otherwise the certification and approval of the filtration system for the engine of this manufacturer can not be obtained.

The filtration system previously installed on the ship uses a plurality of fluid flow branching units, and a back flushable automatic filter (back flushing filter) is used in the main flow branch where the engine of the ship is connected. In most cases, And filter cans for obtaining a large filter surface. By means of a back flushing device, these filter cans can be individually backflushed individually or in groups, where all other filter cans are available for filter operation. For example, reference may be made to WO 01/89658 A1 or EP 0 656 223 A1, in which the basic construction of the corresponding automatic filter is shown and explained.

In a filtration system known from JP 2003/120794, a secondary flow circuit having a main flow branch and a secondary flow filter with a main flow filter is provided, wherein the supply of the feed and lubricant to the engine or other consuming source Can be controlled via a switching valve, such that it can be done via a flow filter or a secondary flow filter. By the switching valve, the secondary flow circuit can be controlled so that the secondary flow filter in the secondary flow circuit can process the backflushing fluid coming from the main flow filter before the backflushing fluid is again fed into the reservoir. A relatively complex and costly switching valve is required upstream and downstream of the main flow filter and the secondary flow filter to selectively provide supply of lubricant through the main flow filter or the secondary flow filter. Tests using a general filtration system present a problem that the backflush filter's lifetime is unsatisfactory during the backflushing of the filter media of the backflushing filter.

It is an object of the present invention to improve the general filtration system so that the maintenance free life of the back flushing filter meets the requirements of the ship engine manufacturer and the ship operator's expectations.

In order to achieve the above and other objects, according to the present invention, the outlet for the backflushing fluid is connected to the inlet of the filter housing for the secondary flow filter and / or to the supply reservoir through the secondary branch provided with the pump do. Due to the pump provided at the secondary branch, a surprisingly positive effect on the back flushing of the filter medium of the back flushing filter is obtained irrespective of the operating pressure in the backflushing filter, The pressure difference between the clean side and the dirty side of the part of the housing is improved.

The main application field of the present invention is for a back flushing filter having its own medium (internal medium), a back flushing device that performs back flushing using a fluid that is purified during filtration operation and passes through the filter surface as filtrate, In a back flushing filter that is backflushed to an internal medium, the cleanliness that can be achieved during backflushing is determined by the pressure difference.

In a particularly preferred embodiment, the pump is formed by a forced feed pump. The pump of the filtration system according to the present invention preferably has a pump output designed for a flow rate of 5% to 15% of the filter perfusion flow rate of the backflush filter during back flushing operation. If a secondary flow filter is used to treat the backflushing fluid, the pump with the corresponding rated flow rate improves the cleaning ability of the filter surface of the backflushing filter during the backflushing operation. When the secondary flow circuit is used for the treatment of the backflushing fluid, the pump provided at the inlet of the secondary flow filter according to the present invention increases the absorption capacity of the filter media of the secondary flow filter at the dirty side and, at the same time, .

According to one embodiment, in the case of a common filtration system, a separate blocking element as a switching valve is connected in each case upstream to the inlet to the main flow filter and to the inlet to the secondary flow filter. According to an alternative embodiment, a single switching valve, preferably a 3/2 multidirectional valve, can be connected upstream as a common switching valve to the inlet to the main flow filter and to the inlet to the secondary flow filter. Thus, the mechanism configuration of the filtration system is minimized and its operation is simplified.

When the secondary flow filter is being used for the treatment of the backflushing fluid, the secondary branch can be opened into the line portion of the secondary flow circuit between the inlet to the secondary flow filter and the switch valve upstream and connected to this inlet. However, the secondary branch can be connected to the inlet of the secondary flow filter in an alternative manner and thus open into the dirty side of the filter media of the secondary flow filter.

As a switching valve, a separate blocking element can be connected in each case to the outlet for the main flow filter and to the outlet for the secondary flow filter, as in the case of a typical filtration system. Alternatively, a switching valve, preferably a 3/2 multidirectional valve, can be connected as a common switching valve downstream to the outlet for the main flow filter and to the outlet for the secondary flow filter, Its operation is also simplified. Additional simplification is achieved if the common switching valves upstream and downstream and the common switching valves downstream are connected firmly together. The connection of the switching valve may be, for example, a control shaft, which is coupled to both ends of each of the switching valves (for example, a switching ball) at both ends thereof. As an example, reference can be made to DE 201 05 654 U1, which represents a switching device with permanently connected switching balls.

Alternatively or additionally, further switching valves may be arranged in the return line between the outlet of the secondary flow filter and the supply reservoir. By means of this switching valve, the supply line leading to the supply reservoir can be shut off, particularly when the lubricating or hydraulic oil supply to the marine machine is only carried out through a secondary flow circuit with a secondary flow filter.

It is particularly convenient for the filter housing for the main flow filter and the filter housing for the secondary flow filter to be in each case fluidly disposed between its inlet and outlet and having an exchangeable filter insert or installation space for the exchangeable filter element. In the main flow filter, all or part of the back flushable filter element can be replaced with a new one at a specified maintenance interval, and in the secondary flow filter, the filter insert needs no further disassembly, The filter insert can be replaced without. In the case of a plurality of filter elements, these filter elements can be combined to form a single interchangeable filter insert.

Additional advantages and embodiments according to the invention can be seen from the following description of exemplary embodiments schematically represented in the figures.

Fig. 1 schematically shows a schematic hydraulic circuit of the filtration system according to the first embodiment of the present invention in a greatly simplified manner.
Fig. 2 schematically shows the schematic filtration system of the present invention according to a second embodiment of the present invention, with a great simplification.
Fig. 3 schematically shows the hydraulic system of the present invention according to a third embodiment of the present invention in a simplified manner by greatly simplifying the filtration system.

In Figure 1, a filtration system 50 according to the present invention for a consumer 1, such as a marine engine (only shown schematically), is shown at schematic hydraulic pressure. In the case of a consumer, it may be another unit requiring lubricating oil or hydraulic oil. In this case, the supply and storage of the oil is done from the supply storage 2 (which may be an oil pan or pan of the engine) schematically shown. The oil to be filtered is sucked from the supply reservoir 2 via the line 4 (e.g., a hose or pipe) by the main pump 3 and also by the branch line 6 via the additional line 5 To the first switching element 7 and the second switching element 8. The first switching element 7 forms the inlet side of the main flow branch 10 for the liquid to be filtered and the main flow branch 10 is provided with a back flushable fluid filter as the main flow filter 11 have. The main flow filter 11 has a housing 12 (only shown schematically), the inlet 13 of which is located downstream of the selector valve 7 and the outlet 14 of the housing, Which is located downstream of the outlet 14 and from there into the inlet of the consumer 1 which receives the oil supply via line 9. [ Oil downstream of the consumer 1 is returned to the feed reservoir 2 via line 29 and then used again in the oil circuit of the filtration system 50. A filter surface 15 is arranged between the inlet 13 and the outlet 14 of the main flow filter 11 which can be backflushed in an appropriate manner for which the main flow filter 11 A backflushing device (not shown) is provided which opens into the outlet 16 in the housing 12 of the main flow filter 11 and is preferably open to the natural medium Filtration through the media) back flushing of the filter surface in the opposite direction of the filtration direction. The filter surface 15 can be formed as a shell, e.g., with a screen fabric or a filter cartridge with wire windings, or with individual filter cans, and can be formed in a manner known to the skilled artisan (and thus a detailed description of the configuration of the backflush filter with a backflushing device Is not here), the flushing device can be cleaned by sucking the filter cans from its end, and in the case of filter cartridges, from the inside or outside, in a counterflow to the direction of filtration.

A secondary flow circuit 30 (which may be engaged and disengaged via the switching valve 8) is provided in parallel with the main flow branch 10 in the filtration system 50 according to Fig. The switch valve 8 is connected upstream to the secondary flow filter 31 (preferably not backflushable) in the secondary flow circuit 30 and is connected in the filter housing 32 to the main flow filter 1 A filter insert or filter cartridge having a filter surface 36 that is larger than the filter surface 15 of the filter insert 15 is preferably interchangeably arranged. The filter surface 36 of the secondary flow filter 31 is exposed to flow through the inlet 33 of the filter housing 32 and also through the outlet 34 of the filter housing 32 of the secondary flow filter 31, The oil to be filtered at the filter surface 36 is discharged therefrom as a filtrate and thereafter flows to the downstream side of the second flow filter 31 in accordance with the switching position of the two switching valves 37, 9 is opened and the switching valve 38 is closed and is supplied to the consumer 1 or the switching valve 37 is closed and is disposed in the pest line 25 connected to the supply reservoir 2 When the switch valve 38 is opened, it is supplied to the supply storage section 2. [ The filter surface 36 of the secondary flow filter 31 preferably has a better filter rating than the filter surface 15 of the back flushable main flow filter 11. The filter surface 36 of the secondary flow filter may have a filter rating in the range of, for example, 5 microns to 20 microns and the filter surface 15 of the main flow filter may be, for example, 25 microns to 50 microns.

In the exemplary embodiment according to Figure 1, the outlet 16 of the main flow filter 12 is connected to the inlet 33 of the secondary flow filter 32 through the secondary branch 20. According to one aspect of the present invention, a pump 21 is disposed in this secondary branch 20, which is preferably a forced feed pump, which, during the backflush operation, (Not shown) to permanently supply the fluid flow of the backflushing fluid accumulated in the outlet 16 of the filter element 12, thereby lowering the fluid pressure at the outlet 16, Increasing the pressure differential of a portion of the filter surface (15) of the flow filter (11). The outlet 22 of the pump 21 is connected to an inlet 33 via an exemplary line 23 and a second flow filter 24 at a branch point 24 between the inlet 33 and the switching valve 8, 31). ≪ / RTI >

In the filtration system 50, two different modes of operation are basically possible. In one operating mode the entire main flow branching section 10 is deactivated and the switching valve 7 and preferably the switching valve 17 is also closed and the pump 21 of the secondary branching section 20 is turned off. Then, the switching valve 8 and the switching valve 37 are opened, and at the same time, the switching valve 38 is closed. By means of this operating mode of the filtration system 50, exclusively by the secondary flow filter 31 and hence its filter surface 36, at the start-up operation of the consumer, for example at the consumer's or even the first operating time of the entire line system, The oil can be filtered and the filter surface preferably has a better filter rating but can also be exchanged much more cost effectively at the same time and can also remove the filtrate removed particles from the entire fluid system, (2). Therefore, in this operating mode, the oil flowing to the consumer 1 is filtered in the secondary flow filter, whereby the oil quality can be continuously improved.

The second possible mode of operation of the filtration system 50 is to form a control operation and a main flow branch 10 for filtering the oil in the supply line leading to the consumer by the filter surface 15 of the main flow filter 11, Lt; / RTI > As a result, the switching valves 7 and 17 in the main flow branching section 10 are opened and accordingly the switching sleeves 8 and 37 of the secondary flow circuit 30 are closed. In the secondary flow circuit 30, however, the switch valve 38 is opened so that the back flushing fluid exiting the outlet 16 of the main flow filter 11 is again supplied to the feed reservoir 2, it is supplied to the secondary flow filter 31 through the pump 21. [ Therefore, in this operating mode, the backflushing body is reprocessed by the secondary flow filter 31, so that the oil quality can also be continuously improved.

Figure 2 shows a slightly modified filtration system 150 as compared to the previous exemplary embodiment wherein all system components having the same layout and functional principle as the previous exemplary embodiment are shown in the exemplary embodiment Are denoted by the same reference numerals as in the embodiment. The oil is withdrawn from the supply reservoir 2 by the main pump 3 and the back flushable main flow filter 11 is switched to the back flushing mode depending on the switching position of the switching valves 7, Or is supplied to a secondary flow circuit (30) having a secondary flow filter (31). The switching valve 7 is open and thus the main flow filter 11 serves to purify the oil supplied to the consumer, so that the switch valve 17 connected to the flow filter downstream is also opened. However, unlike the previous exemplary embodiment, the outlet 16 of the housing 12 of the main flow filter 11 is not open into the supply line of the secondary flow filter, There is provided a secondary branch 120 which is opened directly into the storage part 2. It is also contemplated that a pump 121 is disposed in the secondary branch 120 to increase the pressure differential of the filter surface 15 of the main flow filter 11 during the backflushing operation, The purification of the filter surface 15 is improved and thus the lifetime of the main flow filter 11 is increased. The switching valve 137 is connected downstream to the secondary flow filter 31 and the pair of switching valves 7 and 17 in the main flow branch is opened or the switching valves 8 and 9 in the secondary flow circuit 30 are opened, 137 are opened, and at the same time, the switching valves of the different branch portions or circuits are closed. The filtration system 150 is provided with a second secondary flow circuit 170 for continuous improvement of the oil in the filtration system 150 which includes a secondary pump 171 for withdrawing oil from the supply reservoir 2 And a purifier, such as a separator or a centrifuge, before the oil circulating in the secondary flow circuit flows back into the feed reservoir 2. The switching valve 7 or 8 or the switching valve 17 or 137 must be operated simultaneously in order to always ensure the inflow of oil to the consumer 1 so that the switching valve can be firmly connected by a control shaft have.

Figure 3 again shows a filtration system 250 of a slightly modified embodiment. In this case, the same reference numerals are used for functionally equivalent system components, as in the case of the two previous exemplary embodiments, and the fluid to be purified is drawn out from the supply storage 2 via the main pump 3, Flows to the consumer 1 via the main flow branch 10 and the main flow filter 11 disposed there or via the secondary flow circuit 30 and the secondary flow filter 31 disposed therein. The outlet 16 in the filter housing 12 of the main flow filter 11 is connected to the inlet of the filter housing 32 of the main flow filter 11 through the secondary branch 20, The back flushing fluid accumulated during the back flushing operation is forcibly supplied through the pump and the pump 21 is disposed in the secondary branch 20, In common in the outlet lines of the main flow branching section 10 and the secondary flow circuit 30 in the main flow branching section 10 and the common switching valve 207 in the supply line of the secondary flow circuit 30 in each case And is simplified by the use of the switching valve 217. In the case of both changeover valves 207 and 217, these changeover valves can be, for example, particularly multi-way valves with switching balls, in particular 3/2 multi-way valves, The fluid is supplied to the main flow branching section 10, to which the fluid is supplied to the secondary flow circuit 30, for example in the switching position rotated by 90 degrees. Depending on the switching position of the switching valve 217, only the working branch is connected to the consumer 1 through the line 9. In this embodiment, it is particularly advantageous to connect the two switching valves 207, 217 firmly, as shown through the control axis symbolically indicated by dash-dot line 280.

Many modifications will be apparent to those skilled in the art, which fall within the scope of the appended claims. In all exemplary embodiments, an additional secondary flow circuit may be provided. As a result of the permanent treatment of the oil, the oil can also be used as hydraulic oil. The individual lines may be provided with additional blocking elements, in particular for maintenance of individual system components.

Claims (11)

1. A filtration system for filtering oil, particularly lubrication oil, for a marine engine unit such as a marine engine, comprising: an oil supply reservoir (2); a main flow branch for oil between the oil supply reservoir (2) A second flow filter 31 having a filter housing 32 in a second flow circuit 30 for oil, and a second flow filter 32 having a filter housing 12 in a second flow circuit 30 for oil, Each of the filter housings 12 of the main flow filter 11 and the filter housing 32 of the secondary flow filter 31 have switchable switching valves 7, 8, 17, 37, 137, The filter housing 12 of the main flow filter having at least one outlet 16 for the backflushing body and the oil being selectively connected to the main flow branching portion 10 or the secondary flow circuit 30 to be supplied to the downstream ship's mechanical unit (s) One switching valve 7, 8, 207 is connected upstream to the inlet 13 for the main flow filter and to the inlet 33 for the secondary flow filter and the outlet 16 for the backflushing fluid, Is connected to the inlet (33) of the filter housing (32) for the secondary flow filter (31) and / or to the supply reservoir (2) through a secondary branch (20; 120) , Filtration system. The method according to claim 1,
Wherein the back flushing filter has a back flushing device for back flushing using internal media. 3. The method according to claim 1 or 2,
Wherein the pump (20; 121) is a forced feed pump and / or the pump has a pump output designed for a flow rate of 5% to 15% of the filter perfusion flow rate of the backflush filter during a backflush operation. 4. The method according to any one of claims 1 to 3,
Wherein a separate blocking element is connected in each case upstream to the inlet (13) for the main flow filter and to the inlet (33) for the secondary flow filter as the selector valve (7; 8). 4. The method according to any one of claims 1 to 3,
A switching valve, preferably a 3/2 multidirectional valve, is connected upstream as a common switching valve (207) to the inlet (13) for the main flow filter and the inlet (33) for the secondary flow filter. The method according to claim 4 or 5,
The secondary branch 20 is open into the line portion of the secondary flow circuit 30 between the inlet 33 for the secondary flow filter and the switching valve 8 , Filtration system. 7. The method according to any one of claims 1 to 6,
Wherein separate blocking elements as switching valves (17, 37; 17, 137) are connected in each case downstream to the outlet (14) for the main flow filter and the outlet (34) for the secondary flow filter. 7. The method according to any one of claims 1 to 6,
A switching valve, preferably a 3/2 multidirectional valve, is connected downstream of the common switching valve 217 to the outlet 40 for the main flow filter and to the outlet 34 for the secondary flow filter. 9. The method according to claim 5 or 8,
Wherein the common switching valve connected upstream and the common switching valve connected downstream are firmly connected to each other. 10. The method according to any one of claims 1 to 9,
The secondary flow circuit 30 is connected to the supply reservoir 2 and a further switching valve 38 is connected to the back flushing line 25 between the outlet 34 of the secondary flow filter and the supply reservoir 2. [ Wherein the filtration system comprises: 11. The method according to any one of claims 1 to 10,
Each of the filter housings (12) for the main flow filter and the filter housing (32) for the secondary flow filter are arranged fluidly between the inlet and the outlet thereof and are provided with replaceable filter inserts and / A filtration system having a space.

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