JP2019528156A - Filtration system for oil filtration for marine machinery such as ship engines - Google Patents

Abstract

The invention relates in particular to a filtration system for the filtration of lubricating oil in marine engines, a supply reservoir 2 for oil, a backwashable mainstream filter 11 in a mainstream branch 10 of oil, and a sidestream in a sidestream circuit 30. The filter housing 12 of the mainstream filter 11 and the filter housing of the substream filter 31 each have an inlet and an outlet, and the filter housing 12 of the mainstream filter is at least one for backwash fluid. Two outlets 16 are provided. At least one on-off valve 7, 8 is connected upstream of the two inlets 13, 33, and oil can be supplied to the marine machine unit via the main flow branch 10 or the subflow circuit 30 selectively. In order to improve the universal filtration system, the backwash fluid outlet 16 is connected to the inlet 33 of the sidestream filter 31 and / or the feed reservoir 2 via the side branch 20 with the pump 21.

Description

  The present invention relates to a filtration system for the filtration of oils, in particular lubricating oils for marine machinery such as ship engines. This includes an oil supply reservoir, a backwashable mainstream filter having a filter housing in the mainstream branch of oil between the supply reservoir and the marine unit, and a subflow filter having a filter housing in the oil subflow circuit; A filter housing of the mainstream filter and a filter housing of the substream filter each having an inlet and an outlet, the filter housing of the mainstream filter having at least one outlet for backwash fluid The at least one on-off valve is connected upstream of the main flow filter inlet and the sub flow filter inlet so that oil can be supplied to the marine machine unit connected downstream via the main flow branch or the sub flow branch.

  The ship's filtration system serves to protect the marine machinery connected to the filtration system. Oil filtration systems are used in ships, particularly in lubricating oil circuits for marine engines that propel ships such as large diesel engines. There are a number of requirements for this filtration system, since in this case a large volume of stream has to be filtered. It must also ensure that large amounts of lubricating oil or hydraulic oil contaminants are removed, and at the same time, operating a lubrication system with less failure over time, even under extreme or fluctuating temperatures and pressures. Required. This is because the ship sails unmaintainable at the port for days or weeks depending on the circumstances. Marine engine manufacturers therefore define the cleanliness to be observed in such filtration systems. This is because the manufacturer's engine cannot be certified or approved otherwise.

  Conventionally, a filter system attached to a ship uses a plurality of fluid flow branches, and a backwashable automatic filter (back flush filter) is used for a main stream branch to which a ship engine is connected. This is often equipped with a filter candle to obtain a large filter area. The backwash device allows these filter candles to be backwashed automatically, individually or in groups, while allowing all other filter candle filtration operations to be used. Reference is made, for example, to WO 01/89658 (A1) or EP 0 656 223 (A1), in which the basic structure of an automatic filter corresponding to this is shown and described.

  A filtration system is known from JP 2003-120794, which has a main flow branch with a main filter and a side flow circuit with a sub flow filter. These are controllable by a switching valve, and the supply of filtered lubricant to the engine or another mechanical device is effected by either a mainstream filter or a sidestream filter. The subflow circuit is controlled by the switching valve so that the backflow filter in the subflow circuit can process the backwash fluid before the backwash fluid from the mainstream filter is returned to the reservoir. In order for the lubricant to be selectively supplied via the main flow filter or the sub flow filter, relatively complicated and expensive switching valves are required upstream and downstream of the main flow filter and the sub flow filter. Trials in general-purpose filtration systems have shown that there is a problem with the filter media of the backwash filter during backwashing and that the service life of the backwash filter is unsatisfactory.

International Publication No. 01/89658 (A1) Pamphlet European Patent Application No. 0656223 (A1) specification Japanese Patent Application Laid-Open No. 2003-120794

  An object of the present invention is to improve a general-purpose filtration system so that the maintenance-free service life of the backwash filter satisfies the requirements of ship engine manufacturers and ship operators.

  To achieve this and further objectives, the present invention allows the backwash fluid outlet to be connected to the inlet of the filter housing of the sidestream filter and / or the supply reservoir via a secondary branch comprising a pump. Proposed to As a result of the provision of a pump in the sub-branch, a surprisingly positive effect was obtained with respect to backwashing of the filter media of the backwash filter. This is because the proper backwashing is established regardless of the operation pressure of the backwashing filter, and the differential pressure between the clean side and the contaminating side of the filter surface portion related to the backwashing operation is improved.

  The main field of application of the present invention relates to a backwash filter having a backwash device that backwashes using its own medium (internal medium), that is, a medium that is cleaned during filtration operation and passes through the filter surface as filtrate. In a backwash filter that is backwashed with an internal fluid, the differential pressure achievable during backwashing determines the cleanliness.

  In a particularly preferred embodiment, the pump comprises a pressure pump. According to the present invention, the pump of the filtration system preferably has a pump output designed to provide a flow rate between 5% and 15% of the backwash filter through flow rate during backwash operation. If a secondary flow circuit is used for backwash fluid treatment, a pump with a corresponding rated flow will improve the cleaning ability of the filter surface of the backwash filter during backwash operation. When a secondary flow filter is used for the treatment of backwash fluid, the pump provided at the inlet of the secondary flow filter according to the present invention increases the absorption capacity of the filter medium on the contaminated side of the secondary flow filter and at the same time during the filtration operation. Ensure large through-flow.

  According to one embodiment, as in the case of the general-purpose filtration system, an independent shut-off element can be connected as an on-off valve, respectively, upstream of the mainstream filter inlet and the substream filter inlet. According to an alternative embodiment, one switching valve, preferably a 3/2 multi-way valve, may be connected as a common on-off valve upstream of the mainstream filter inlet and the subflow filter inlet. This minimizes the instrumentation structure of the filtration system and simplifies operation.

  When the secondary flow filter is used for the treatment of backwash fluid, the secondary branch may be opened to a line portion of the secondary flow circuit between the inlet of the secondary flow filter and the on-off valve connected upstream thereof. However, the secondary branch can alternatively be connected to the inlet of the secondary flow filter and open to the contaminated side of the filter media of the secondary flow filter.

  As with the general-purpose filtration system, independent shut-off elements may be connected as opening / closing valves to the outlet of the main flow filter and the outlet of the sub flow filter, respectively. Alternatively, a switching valve, preferably a 3/2 multi-way valve, can be connected as a common on-off valve to each downstream of the mainstream filter outlet and the substream filter outlet. As a result, the instrumentation structure of the filtration system and its operation are also simplified. Further simplification is achieved if a common switching valve connected upstream of the plurality of filters and a common on-off valve connected downstream thereof are interconnected with a positive correlation. The connection of the on-off valves can be performed by, for example, a control shaft having both ends engaged with a switching body such as a switching ball of each switching valve. As an example, reference is made to German Utility Model No. 20105654 (Ul), which shows a switching device having a permanently connected switching ball.

  As an alternative or in addition, a further on-off valve can be arranged in the return line between the secondary flow filter outlet and the supply reservoir. With this on-off valve, in particular, when lubricating oil or hydraulic oil is supplied to the marine machine unit via only a secondary flow circuit with a secondary flow filter, the supply line to the supply reservoir can be shut off.

  It is particularly preferred if the filter housing of the mainstream filter and the filter housing of the substream filter each have an installation space for a replaceable filter insert or replaceable filter element, fluidly disposed between its inlet and outlet. It is. In mainstream filters, all or part of the backwashable filter can be replaced with new ones at specific maintenance intervals, while in sidestream filters the filter is not required to perform any other disassembly operations, especially without removing the connecting pipe. The insert can also be exchanged. If there are multiple filter elements, they can be combined into a single replaceable filter insert.

  Further advantages and embodiments of the filtration system according to the invention are inferred from the following description of an exemplary embodiment schematically depicted in the drawings.

FIG. 1 is a simplified hydraulic schematic diagram of a filtration system of the present invention according to a first exemplary embodiment. FIG. 3 is a simplified hydraulic schematic diagram of a filtration system of the present invention according to a second exemplary embodiment. FIG. 6 is a simplified hydraulic schematic diagram of a filtration system of the present invention according to a third exemplary embodiment.

  In FIG. 1, a filtration system of the present invention for a mechanical device 1 such as a ship engine, which is shown only schematically, is shown in a hydraulic schematic diagram generally designated 50. Depending on the mechanical device, it may be a separate unit that requires lubricating oil or hydraulic oil. Here, the supply and storage of oil takes place in the supply reservoir 2 shown schematically, which may be an oil sump or an oil pan of the engine. The oil to be filtered is sucked from the supply reservoir 2 by the main pump 3 via a line 4 such as a hose or pipe, and with the first switching element 7 for the branch line 6 via a further line 5. Provided to both of the second opening and closing elements 8. The first opening / closing element 7 forms the inlet side of the mainstream branch 10 of the fluid to be filtered. Here, a backwashable fluid filter is disposed in the mainstream branch 10 as the mainstream filter 11. The main flow filter 11 has a housing 12 that is schematically shown only, and its inlet 13 is located downstream of the on-off valve 7 and its outlet 14 is disposed downstream of the outlet 14 via a conduit. It leads to valve 17. And it leads to the inlet of the mechanical apparatus 1 which should be supplied with oil through the pipe line 9 there. Downstream of the machine 1, the oil is then returned to the supply reservoir 2 via line 29 for reuse in the oil circuit of the filtration system 50. Between the inlet 13 and the outlet 14 of the mainstream filter 11, a filter face 15 is arranged which can be backwashed in a suitable manner. For this purpose, the mainstream filter 11 is provided with a backwash device (not shown), which leads to the outlet 16 of the housing 12 of the mainstream filter 11 and preferably passes the filter medium through the filter medium during the filtration operation, preferably the natural medium. The filter surface can be backwashed with liquid in the direction opposite to the filtration direction. The filter surface 15 can be formed, for example, from a filter cartridge or individual filter candles with a mesh fiber or winding as the outer shell, and the cleaning device can remove the filter candle from its end and, in the case of a filter cartridge, its inside. Alternatively, from the outside, suction cleaning can be performed in a flow opposite to the filtration direction. This is well known to those skilled in the art and therefore a detailed description of a backwash filter structure with a backwash device is not provided herein.

  In the filtration system 50 of FIG. 1, a secondary flow circuit 30 that can be engaged and disengaged via the on-off valve 8 is provided in parallel to the main flow branch 10. The on-off valve 8 is connected upstream of the subflow filter 31 of the subflow circuit 30. The secondary flow filter is preferably not backwashable, but its filter housing 32 is preferably provided with a filter insert or filter cartridge having a filter surface 36 that is larger than the filter surface 15 of the mainstream filter 1 and is preferably replaceable. Is possible. The filter surface 36 of the side flow filter 31 is exposed to flow through an inlet 33 on the filter housing 32. And the oil filtered by the filter surface 36 is discharged | emitted through the exit 34 on the filter housing 32 of the substream filter 31 as filtrate. At this time, the switching position of the on-off valves 37, 38 connected downstream of the sub-flow filter 31 opens the on-off valve 37 leading to the pipeline 9, and when the on-off valve 38 is closed, supply to the machine device 1 is possible. Alternatively, when the on-off valve 37 is closed and the on-off valve 38 disposed in the supply conduit 25 to the supply reservoir 2 is open, supply to the supply reservoir 2 is possible. The filter surface 36 of the substream filter 31 preferably has a filtration particle size superior to the filter surface 15 of the backwashable mainstream filter 11. The filter surface 36 of the side flow filter may have a filtration particle size in the range of 5 μm to 20 μm, for example, and the filtration particle size of the filter surface 15 of the mainstream filter may be, for example, 25 μm to 50 μm.

  In the exemplary embodiment of FIG. 1, the outlet 16 of the mainstream filter 12 is connected to the inlet 33 of the sidestream filter 32 via the side branch 20. According to one aspect of the present invention, the pump 21 is disposed in the sub-branch 20. This pump 21 is preferably a pumping pump that permanently supplies the backwash fluid flow that accumulates at the outlet 16 of the backwash filter housing 12 during backwash operation, resulting in fluid pressure at the outlet 16. Is lowered to increase the differential pressure of a part of the filter surface 15 of the mainstream filter 11 to improve the efficiency of backwashing of the filter surface 15. The outlet 22 of the pump 21 is supplied via the pipe 23 shown as an example to supply the secondary flow filter at a branch point 24 between the inlet 33 of the secondary flow filter 31 and the on-off valve 8 connected upstream thereof. Connect to the pipeline.

  In the filtration system 50, two different modes of operation are basically possible. In one mode of operation, all mainstream branches 10 are inactive, the on-off valve 7 and preferably the on-off valve 17 are closed, and the pump 21 of the sub-branch 20 is also disconnected. Then, the on-off valve 8 and the on-off valve 37 are opened, and at the same time, the on-off valve 38 is closed. The mode of operation of this filtration system 50 is such that, for example, during the start-up operation of the machine device, i.e. during the initial operation time of the machine device or the entire pipeline system, oil can only be filtered by the secondary flow filter 31 and therefore by its filter surface 36. And This not only has good filtration particle size, but at the same time can be exchanged more cost-effectively, and furthermore, the filtration particles are fed back to the whole fluid system and in particular to the oil pan 2 via a backwash device. There is no. Therefore, filtering the oil flowing to the mechanical device 1 with a secondary flow filter ensures that the oil quality is continuously improved in this mode of operation. A second possible mode of operation of the filtration system 50 forms a control action and uses the mainstream branch 10 to filter the oil in the supply line to the machinery by the filter surface 15 of the mainstream filter 11. Here, the on-off valve 7 and the on-off valve 17 of the main flow branch 10 are opened correspondingly, and the on-off valve 8 and the on-off valve 37 of the subflow circuit 30 are similarly closed. However, the on-off valve 38 is opened in the side flow circuit 30. Therefore, the backwash fluid discharged at the outlet 16 of the mainstream filter 11 is supplied to the substream filter 31 via the pump 21 and then returned to the supply reservoir 2 through the pipe 25. Therefore, by reprocessing the backwash fluid with the secondary flow filter 31 in this mode of operation, a continuous improvement in oil quality is ensured again.

  FIG. 2 shows a filtration system 150 that is slightly modified compared to the previous exemplary embodiment. Here, all system components having the same arrangement and functional principle as in the previous exemplary embodiment are identified with the same reference numerals as in the exemplary embodiment of FIG. As in the previous exemplary embodiment, the oil is extracted from the supply reservoir 2 by the pump 3 and has a mainstream branch 10 and a substream filter 31 with a backwashable mainstream filter 11 depending on the switch position of the on-off valves 7, 8. Is supplied to any one of the sub-flow circuits 30. The on-off valve 7 is opened, and thus the on-off valve 17 connected downstream of this filter is also opened with the mainstream filter 11 serving to clean the oil supplied to the machine. However, unlike in the previous exemplary embodiment, the outlet 16 in the housing of the mainstream filter 11 is not connected to the supply line of the sidestream filter, but here a side branch 120 is provided to provide suitable tubing. Directly connected to the supply reservoir 2 via the path 125. In order to increase the differential pressure applied to the filter surface 15 of the mainstream filter 11 during the backwash operation, a pump 121 is also arranged in the sub branch 120. As a result, the cleaning of the filter surface 15 during the backwash operation is improved, thereby extending the service life of the mainstream filter 11. The on-off valve 137 is connected downstream of the sub-flow filter 31, and either the pair of on-off valves 7, 17 of the main flow branch is opened or the pair of on-off valves 8, 137 of the sub-flow circuit 30 is opened, At this time, the open / close valve of the other pipe or circuit is closed. In the filtration system 150, a second sidestream circuit 170 is provided to continuously improve the oil in the filtration system 150. This includes a second pump 171 for extracting oil from the supply reservoir 2 and a separator or oil for cleaning the oil circulated in this second subflow circuit before returning to the supply reservoir 2 And a cleaning device such as a centrifuge. In order to ensure the constant inflow of oil into the mechanical device 1, the on-off valves 7 and 8 or the on-off valves 17 and 137 need to operate simultaneously. These on-off valves are connected with a positive correlation by, for example, a control shaft (not shown).

  FIG. 3 is an alternative embodiment filtration system 250 that is further modified. Again, functionally identical system components are given the same reference numerals as in the previous two exemplary embodiments. The fluid to be cleaned is extracted from the supply reservoir 2 via the main pump 3, via the mainstream branch 10 and the mainstream filter 11 disposed therein, or disposed in the substream circuit 30 and therein. It flows into the mechanical device 1 by either passing through the secondary flow filter 31. Similar to the first exemplary embodiment, the outlet 16 of the filter housing 12 of the mainstream filter 11 is connected to the inlet 33 of the filter housing 32 of the mainstream filter 11 via the sub-branch 20. A pump 21 is arranged in the sub-branch 20 and the backwash fluid accumulated during the backwash operation is pumped accordingly. The instrumentation structure of the filtration system 250 uses a common switching valve 207 in the supply line of the main flow branch 10 and the sub flow circuit 30 and a common switching valve 217 in the outlet line of the main flow branch 10 and the sub flow circuit 30, respectively. To simplify it. In both switching valves 207, 217, these can in particular be multi-way valves, in particular 3/2 multi-way valves, each with eg a switching ball. Here, in the switching valve 207, if the switching ball is in one switching position, the fluid is supplied to the main flow branch 10. For example, the fluid is supplied to the sub-flow circuit 30 in the switching position rotated 90 degrees with respect to the switching ball. Depending on the switching position of the on-off valve 217, only the active line is thus connected to the mechanical device 1 via the line 9. According to this embodiment, it is possible to connect the two on-off valves 207 and 217 with a positive correlation through a control shaft represented symbolically by a one-dot chain line 280 as shown in the drawing, which is particularly advantageous.

  Many modifications will be apparent to those skilled in the art which are within the scope of protection of the appended claims. In all exemplary embodiments, additional sidestream circuits can be provided. As a result of the permanent treatment of the oil, it can also be used as a hydraulic oil. It is also possible to arrange additional blocking elements in the individual lines, especially for the maintenance of individual system parts.

Claims (11)

A filtration system for filtering oil and lubricating oil for marine machine units such as ship engines,
An oil supply reservoir (2);
Backwashable mainstream filter (11) having a filter housing (12) in the mainstream branch (10) of oil between the supply reservoir (2) and the marine machine unit;
A secondary flow filter (31) having a filter housing (32) in the secondary flow circuit (30) of oil;
A switchable on-off valve (7, 8, 17, 37; 137; 207, 217);
With
The filter housing (12) of the mainstream filter (11) and the filter housing (32) of the substream filter (31) have an inlet (13; 33) and an outlet (14; 34), respectively.
The filter housing (12) of the mainstream filter has at least one outlet (16) for backwash fluid;
At least one on-off valve (7, 8; 207) is connected upstream of the inlet (13) of the main flow filter and the inlet (33) of the sub flow filter, and oil is supplied to the main flow branch (10) or the sub flow filter. Via the flow circuit (30), can be selectively supplied to the marine machine unit downstream of them,
The outlet (16) of the backwash fluid is connected to the inlet (33) of the filter housing (32) of the sub-flow filter (31) via a sub-branch (20; 120) provided with a pump (21; 121). And / or a filtration system, characterized in that it is connected to the supply reservoir (2).   The filtration system according to claim 1, wherein the backwash filter has a backwash device for backwashing the internal medium.   The pump (20; 121) is a pressure pump and / or has a pump output designed to have a flow rate between 5% and 15% of the back-flow rate of the backwash filter during backwash operation. The filtration system according to any one of claims 1 and 2, wherein the filtration system is characterized in that   An independent shut-off element is connected as an on-off valve (7; 8) upstream of each of said inlet (13) of said mainstream filter and said inlet (33) of said sidestream filter. The filtration system according to any one of claims 1 to 3.   A switching valve, preferably a 3/2 multi-way valve, is connected as a common on-off valve (207) upstream of the inlet (13) of the mainstream filter and the inlet (33) of the substream filter. The filtration system according to any one of claims 1 to 3.   The sub-branch (20) is connected to a pipe portion of the sub-flow circuit (30) between the inlet (33) of the sub-flow filter and the on-off valve (8; 207) connected upstream thereof. The filtration system according to claim 4, wherein the filtration system is communicated.   An independent shut-off element is connected as an on-off valve (17, 37; 17, 137) downstream of each of the outlet (14) of the mainstream filter and the outlet (34) of the substream filter. The filtration system according to any one of claims 1 to 6.   A switching valve, preferably a 3/2 multi-way valve, is connected as a common on-off valve (217) downstream of the outlet (40) of the mainstream filter and the outlet (34) of the substream filter. The filtration system according to any one of claims 1 to 6.   The filtration system according to claim 5 and 8, wherein the common on-off valve connected upstream and the common on-off valve connected downstream are interconnected with a positive correlation.   The secondary flow circuit (30) is connected to the supply reservoir (2), and a further on-off valve (38) is connected between the outlet (34) of the secondary flow filter and the supply reservoir (2). 10. Filtration system according to any one of claims 1 to 9, characterized in that it is arranged in the washing line (25).   The filter housing (12) of the mainstream filter and the filter housing (32) of the sidestream filter each have a fluid between its inlet and outlet for a replaceable filter insert and / or replaceable filter element. The filtration system according to any one of claims 1 to 10, wherein the filtration system has an installation space arranged in an automatic manner.

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