CN215805530U - Filter device, hydraulic system and engineering machinery - Google Patents

Abstract

The utility model provides a filtering device, a hydraulic system and engineering machinery, wherein the filtering device comprises: the oil inlet and the oil outlet are formed in the shell; the oil inlet channel and the oil filtering channel are arranged in the shell, the oil inlet channel is communicated with the oil inlet, and the oil filtering channel is communicated with the oil outlet; the oil suction mechanism is connected with the shell and positioned between the oil inlet channel and the oil filtering channel, and is suitable for driving oil from the oil inlet channel into the oil filtering channel; and the filtering structure is arranged in the oil filtering channel. The filtering device can realize active oil absorption and filtration, and therefore hydraulic oil can be filtered when the filtering device is installed on an oil tank of a hydraulic system. Meanwhile, the filtering device does not need to be installed on an oil inlet oil way or an oil return oil way of the hydraulic system, so that influence on each hydraulic element is avoided.

Description

Filter device, hydraulic system and engineering machinery

Technical Field

The utility model relates to the technical field of hydraulic oil filtering equipment, in particular to a filtering device, a hydraulic system and engineering machinery.

Background

In the operation process of engineering machinery such as a concrete pump truck and the like, a hydraulic system is an important system for driving the hydraulic system to normally work, and the guarantee of the cleanliness of hydraulic oil is an important condition for normal work of various working elements in the hydraulic system. In the existing hydraulic system, impurities of oil in a filter filtering system are added on an oil return path of the hydraulic system, and an oil absorption filter is added on the oil inlet path of some important elements to ensure that the cleanliness of the oil entering the system meets working requirements.

For the oil return filter, although the oil in the hydraulic system can be always in a filtering state in the circulation process, the oil can reach the filter through all elements of the hydraulic system to generate a filtering effect. For the oil absorption filter, the oil absorption difficulty of the system can be increased by adding the high-precision filter on an oil inlet path, and the oil absorption can be exhausted in serious cases, so that cavities and cavitation are generated, and the service life of each element in the system is greatly reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the present invention is to overcome the defects that the filter in the hydraulic system in the prior art has a poor filtering effect and is easy to affect the hydraulic element, so as to provide a filtering device, a hydraulic system and an engineering machine.

In order to solve the above problems, the present invention provides a filter device including: the oil inlet and the oil outlet are formed in the shell; the oil inlet channel and the oil filtering channel are arranged in the shell, the oil inlet channel is communicated with the oil inlet, and the oil filtering channel is communicated with the oil outlet; the oil suction mechanism is connected with the shell and positioned between the oil inlet channel and the oil filtering channel, and is suitable for driving oil from the oil inlet channel into the oil filtering channel; and the filtering structure is arranged in the oil filtering channel.

Optionally, the oil suction mechanism is a centrifugal mechanism, the centrifugal mechanism comprises an inlet and an outlet, one of the inlet and the outlet is arranged in the axial direction of the centrifugal mechanism, the other of the inlet and the outlet is arranged in the circumferential direction of the centrifugal mechanism, the inlet is communicated with the oil inlet channel, and the outlet is communicated with the oil filtering channel.

Optionally, the inlet is arranged in the axial direction of the centrifugal mechanism, the outlet is arranged in the circumferential direction of the centrifugal mechanism, the housing comprises an annular side wall, and a top wall and a bottom wall connected to both ends of the annular side wall, the oil inlet is arranged on the bottom wall, the oil outlet is arranged on the annular side wall,

optionally, the centrifugal mechanism is a centrifugal impeller, the centrifugal impeller is arranged on the top wall, a separation sleeve is arranged below the centrifugal impeller, the upper end of the separation sleeve is communicated with the inlet, the lower end of the separation sleeve is communicated with the oil inlet, an oil inlet channel is formed in a space in the separation sleeve, and an oil filtering channel is formed in a space between the separation sleeve and the annular side wall.

Optionally, the centrifugal impeller comprises a shaft, the upper end of the shaft passing through the top wall and adapted to be connected to an external drive mechanism; or the separating sleeve and the centrifugal impeller are of an integrated structure or fixedly connected, a sealing structure and a bearing are arranged between the lower end of the separating sleeve and the bottom wall, and the bearing is located below the sealing structure.

Optionally, the filter device further comprises a flow guide pipe, one end of the flow guide pipe is connected to the oil inlet, and the other end of the flow guide pipe extends towards the direction departing from the shell.

Optionally, the filter structure is a cylindrical filter element, the filter element is arranged between the annular side wall and the separation sleeve, a support protrusion is arranged on the bottom wall, and the support protrusion is supported on the inner side of the bottom of the filter element, or the filter device further comprises an annular support plate, one end of the annular support plate is connected with the annular side wall, and the other end of the annular support plate is bent downwards and supported on the inner side of the top of the filter element.

Optionally, a connecting flange is provided on the housing.

The utility model also provides a hydraulic system, which comprises an oil tank and the filtering device arranged on the side wall of the oil tank, wherein the filtering device is the filtering device.

The utility model also provides engineering machinery comprising the hydraulic system or the filtering device.

The utility model has the following advantages:

by utilizing the technical scheme of the utility model, when the oil suction mechanism works, the driving force generated by the oil suction mechanism can enable the hydraulic oil to enter the oil inlet channel from the oil inlet and then enter the oil suction mechanism through the inlet. And then, the driving force of the oil absorption mechanism can enable the hydraulic oil to be discharged from the outlet, the hydraulic oil passes through the oil filtering channel and is filtered by the filtering structure after being discharged, and the hydraulic oil is discharged from the oil outlet after being filtered. The filtering device can realize active oil absorption and filtration, and therefore hydraulic oil can be filtered when the filtering device is installed on an oil tank of a hydraulic system. Meanwhile, the filtering device does not need to be installed on an oil inlet oil way or an oil return oil way of the hydraulic system, so that influence on each hydraulic element is avoided. Therefore, the technical scheme of the utility model overcomes the defects that the filter in the hydraulic system in the prior art has poor filtering effect and is easy to influence hydraulic elements.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic partial cross-sectional view of a filtration apparatus of the present invention;

FIG. 2 shows a schematic cross-sectional view of the filter apparatus of FIG. 1 (and showing hydraulic oil flow direction);

FIG. 3 shows an exploded schematic view of the filter apparatus of FIG. 1; and

fig. 4 shows a schematic view of the assembly of the tank and the filter device of the hydraulic system of the utility model.

Description of reference numerals:

10. a housing; 11. an oil inlet; 12. an oil outlet; 13. an annular sidewall; 14. a top wall; 15. a bottom wall; 151. a support boss; 20. an oil inlet channel; 30. an oil filter channel; 40. an oil suction mechanism; 41. an inlet; 42. an outlet; 43. a rotating shaft; 50. a filter structure; 60. a partition sleeve; 70. a sealing structure; 80. a bearing; 90. a flow guide pipe; 100. an annular support plate; 110. a connecting flange; 120. an oil tank; 130. and (4) a filtering device.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, the filter device of the present embodiment includes a housing 10, an oil inlet passage 20, an oil filter passage 30, an oil suction mechanism 40, and a filter structure 50. Wherein, the housing 10 is provided with an oil inlet 11 and an oil outlet 12. An oil inlet channel 20 and an oil filtering channel 30 are arranged in the shell 10, the oil inlet channel 20 is communicated with the oil inlet 11, and the oil filtering channel 30 is communicated with the oil outlet 12. The oil suction mechanism 40 is provided in the casing 10 between the oil inlet passage 20 and the oil filter passage 30. The oil suction mechanism 40 includes an inlet 41 provided in the axial direction thereof and an outlet 42 provided in the axial direction thereof, the inlet 41 being communicated with the oil inlet passage 20, and the outlet 42 being communicated with the oil filter passage 30. A filter structure 50 is arranged in the oil filter channel 30.

Preferably, the oil suction mechanism 40 in this embodiment is a centrifugal mechanism, but of course, in some embodiments not shown, the oil suction mechanism 40 may be other mechanisms capable of generating a driving force to the oil as long as the driving force for the oil flowing from the oil inlet passage 20 to the oil filter passage 30 is provided.

By using the technical solution of the present embodiment, when the oil suction mechanism 40 works, the negative pressure generated by the oil suction mechanism 40 can make the hydraulic oil enter the oil inlet channel 20 from the oil inlet 11, and then enter the oil suction mechanism 40 through the inlet 41. Subsequently, the centrifugal force generated by the oil suction mechanism 40 can discharge the hydraulic oil from the outlet 42, and after the hydraulic oil is discharged, the hydraulic oil passes through the oil filtering channel 30 and is filtered by the filtering structure 50, and the hydraulic oil is discharged from the oil outlet 12 after being filtered. The filtering device can realize active oil absorption and filtration, and therefore hydraulic oil can be filtered when the filtering device is installed on an oil tank of a hydraulic system. Meanwhile, the filtering device does not need to be installed on an oil inlet oil way or an oil return oil way of the hydraulic system, so that influence on each hydraulic element is avoided. Therefore, the technical scheme of the embodiment overcomes the defects that a filter in a hydraulic system in the prior art is poor in filtering effect and easily affects hydraulic elements.

Of course, it will be understood by those skilled in the art that the inlet 41 and outlet 42 of the centrifugal mechanism may be axially and circumferentially positionally displaced.

As shown in fig. 1 to 3, in the present embodiment, the housing 10 includes an annular side wall 13, and a top wall 14 and a bottom wall 15 connected to both ends of the annular side wall 13. The oil inlet 11 is arranged on the bottom wall and the oil outlet 12 is arranged on the annular side wall 13. Specifically, the housing 10 in the present embodiment has a cylindrical structure, and the overall flow direction of the hydraulic oil is bottom-in oil and side-out oil. Further, the housing 10 in this embodiment is a split structure, and includes a cylinder and an end cap mounted on the cylinder, where the cylinder includes a part of the annular side wall 13 and the bottom wall 15, and the end cap includes another part of the annular side wall 13 and the top wall 14. The cylinder body and the end cover are installed through a fastener, and a sealing ring is arranged for sealing. The split structure of the housing 10 facilitates installation of other internal structures (centrifugal mechanism, filtering structure 50, etc.).

Further, as can be seen from fig. 1, the oil outlet 12 is plural, and the plural oil outlets 12 are arranged in an array in the circumferential direction.

Of course, in some embodiments, not shown, the housing 10 may also be a unitary cylindrical structure.

As shown in fig. 1 to 3, in the solution of the present embodiment, the centrifugal mechanism is a centrifugal impeller, and the centrifugal impeller is disposed at the top wall 14. A separation sleeve 60 is arranged below the centrifugal impeller, the upper end of the separation sleeve 60 is communicated with the inlet 41, and the lower end of the separation sleeve 60 is communicated with the oil inlet 11. The space inside the partition sleeve 60 forms the oil inlet passage 20, and the space between the partition sleeve 60 and the annular side wall 13 forms the oil filter passage 30. Specifically, the partition sleeve 60 has an annular cylindrical structure, and both the upper and lower ends thereof are open. The partition sleeve 60 divides the space inside the casing 10 into two parts, one is a cylindrical space surrounded by the partition sleeve 60 itself, i.e., the oil inlet passage 20 described above, and the other is an annular cylindrical space formed between the partition sleeve 60 and the annular side wall 13, i.e., the oil filter passage 30 described above.

As shown in fig. 1 and 2, the upper end of the separating sleeve 60 has a certain clearance with the top wall 14 for accommodating the centrifugal impeller. The lower end of the separating sleeve 60 communicates with the oil inlet 11 and the upper end communicates with the axial inlet 41 of the centrifugal impeller. Referring to the flow direction of the hydraulic oil in fig. 2, it can be understood by those skilled in the art that when the centrifugal impeller rotates, a negative pressure can be formed in the separation sleeve 60, so that the hydraulic oil can enter the separation sleeve 60 (i.e., the oil inlet channel 20) through the oil inlet 11, and then enter the centrifugal impeller through the inlet 41. The centrifugal force generated when the centrifugal impeller rotates can make the hydraulic oil be discharged from the circumferential outlet 42 of the centrifugal impeller, then the hydraulic oil enters the space between the separating sleeve 60 and the annular side wall 13 (i.e. the oil filtering channel 30), and the hydraulic oil is filtered by the filtering structure 50 and then discharged from the oil outlet 12.

Further, the centrifugal mechanism is not limited to the centrifugal impeller, and any other mechanism that can convey the fluid from the axial direction to the circumferential direction may be used as the oil suction mechanism 40.

In the solution of the present embodiment, as shown in fig. 2, the centrifugal impeller comprises a rotating shaft 43, the upper end of the rotating shaft 43 passing through the top wall 14 and being adapted to be connected to an external driving mechanism. The external driving mechanism is used for driving the rotating shaft 43 to rotate, and then driving the centrifugal impeller to rotate. The external driving mechanism can be an engine, a motor and the like of the engineering machine. Further, in order to ensure the sealing performance of the filtering apparatus, a sealing ring may be disposed between the rotating shaft 43 and the top wall 14, and in order to ensure smooth rotation of the rotating shaft 43, a bearing may be disposed between the rotating shaft 43 and the top wall 14.

As shown in fig. 2, in the solution of the present embodiment, the separation sleeve 60 and the centrifugal impeller are integrated, and a sealing structure 70 and/or a bearing 80 is provided between the lower end of the separation sleeve 60 and the bottom wall 15. Specifically, the upper end of the partition sleeve 60 is connected to the lower side of the centrifugal impeller, and the upper end of the partition sleeve 60 communicates with the inlet 41. When the centrifugal impeller rotates, the centrifugal impeller drives the separation sleeve 60 to rotate synchronously, so that the separation sleeve 60 rotates relative to the bottom wall 15. In order to prevent the hydraulic oil from leaking along the gap between the bottom of the partition sleeve 60 and the bottom wall 15 and to isolate the oil inlet passage 20 and the oil filter passage 30, a seal structure 70 is provided between the lower end of the partition sleeve 60 and the bottom wall 15, and preferably, the seal structure 70 is a seal ring. In order to enable smooth rotation of the lower end of the partition sleeve 60, a bearing 80 is provided between the partition sleeve 60 and the bottom wall 15.

As shown in fig. 1 and fig. 2, in the solution of the present embodiment, the filter device further includes a flow guide tube 90, one end of the flow guide tube 90 is connected to the oil inlet 11, and the other end of the flow guide tube 90 extends in a direction away from the housing 10. Specifically, in order to prevent the filtered oil discharged from the oil outlet 12 from being sucked by the centrifugal impeller from the oil inlet 11, the distance between the end of the draft tube 90 and the oil outlet 12 should be as far as possible. In this embodiment, the flow guide tube 90 may be longer, so that a longer distance is provided between the inlet of the flow guide tube 90 and the oil outlet 12. Or, the end of the flow guide pipe 90 is connected with another pipeline, so that the oil suction position is far away from the oil outlet 12.

As shown in fig. 1 to 3, in the solution of the present embodiment, the filter structure 50 is a cylindrical filter element, and the filter element is disposed between the annular sidewall 13 and the separation sleeve 60. In particular, the diameter of the filter cartridge is greater than the diameter of the separating sleeve 60 and less than the diameter of the annular side wall 13. With reference to the flow schematic of the hydraulic oil in fig. 2, after being discharged from the outlet 42 of the centrifugal impeller, the hydraulic oil first enters the inside of the filter element, then flows from the inside of the filter element to the outside of the filter element, is filtered, and then is discharged through the oil outlet 12.

As shown in fig. 2, in the solution of the present embodiment, a support protrusion 151 is provided on the bottom wall 15, and the support protrusion 151 is supported on the inner side of the bottom of the filter element. Specifically, the bottom wall 15 has a vertical bending section, the upper portion of the vertical bending section has a horizontal bending section towards the inner side, and the vertical bending section and the horizontal bending section together form the supporting protrusion. The outer wall of the vertical bending section is supported at the inner side wall of the bottom of the filter element. It can also be seen in connection with fig. 2 that the horizontal bending section is provided with a through hole, and the lower end of the separation sleeve 60 passes through the through hole downwards, so that there is a gap between the outer side wall of the bottom of the separation sleeve 60 and the vertical bending section. The seal structure 70 and the bearing 80 described above are both disposed in this gap.

As shown in fig. 1 and 2, in the solution of the present embodiment, the filter device further includes an annular support plate 100, one end of the annular support plate 100 is connected to the annular side wall 13, and the other end of the annular support plate 100 is bent downward and supported inside the top of the filter element. Specifically, one end of the annular support plate 100 is interposed between the cylindrical body of the housing 10 and the end cap, and the other end thereof is bent downward and then abuts against the inner sidewall of the upper portion of the filter element, thereby supporting the filter element. Further, as can be seen from fig. 2, the annular support plate 100 also closes the upper portion of the space between the filter element and the annular side wall 13, so that the hydraulic oil can enter the gap between the filter element and the separating sleeve 60 (i.e. the inner side of the filter element) after being discharged from the outlet 42 of the centrifugal impeller, and is discharged from the oil outlet 12 after being filtered by the filter element.

As shown in fig. 1 and 2, in the solution of the present embodiment, a connecting flange 110 is provided on the housing 10. The attachment flange 110 is adapted to be connected to a fuel tank.

As shown in fig. 4, the present embodiment further provides a hydraulic system, which includes an oil tank 120 and a filtering device 130 disposed on a side wall of the oil tank 120, where the filtering device 130 is the above-mentioned filtering device. As can be seen from fig. 4, the filter device 130 is directly connected to the wall of the fuel tank 120 via the connecting flange 110, so that the fuel tank does not have to be provided with a separate mounting bracket. Meanwhile, the filtering device 130 can realize active oil absorption and filtration, so that the filtering device is not required to be arranged on an oil inlet oil way or an oil return oil way of the hydraulic system, and the situations that an oil pump sucks air and a cavity and cavitation are generated are avoided. Meanwhile, the filter device 130 allows most of the oil in the hydraulic system to reach the filter for filtering without passing through the elements of the hydraulic system. The risk of card distribution, abrasion and oil leakage caused by hydraulic oil pollution of each element in the system is reduced, and the reliability of the hydraulic system is improved.

The embodiment also provides the engineering machinery, and the engineering machinery comprises the hydraulic system. Preferably, the centrifugal impeller in the filtering device 130 is driven by an engine of the engineering machine through a driving mechanism to rotate, so that the rotation speed of the centrifugal impeller is not related to the working condition of the main hydraulic system, the flow rate caused by the rotation of the centrifugal impeller is in a stable state, and the filtering efficiency of the filtering device is irrelevant to the operation process of the main hydraulic system. Meanwhile, in the standby process of the hydraulic system, although there is no hydraulic oil circulation, the power device is driven by the engine alone, so as long as the engine is started, the filtering device 130 is always operated, and thus the hydraulic oil in the oil tank 120 is filtered in real time.

According to the above description, the present patent application has the following advantages:

1. because the hydraulic oil tank is always in a self-circulation filtering state, an oil absorption filter does not need to be arranged in the system, and the working conditions that an oil pump sucks air and generates cavities and cavitation are reduced;

2. the independent oil return enables most of the oil in the system to reach the filter for filtering without passing through each element of the hydraulic system. The risks of sticking, abrasion and oil leakage caused by hydraulic oil pollution of each element in the system are reduced, and the reliability of the system is improved;

3. the driving filter is directly driven by the engine through the driving mechanism, and the rotating speed of the driving filter is not related to the working condition of the main system, so that the flow caused by the rotation of the impeller is in a stable state, and the operation process of the main system is irrelevant to the filtering efficiency of the independent system;

4. in the standby process of the system, although no hydraulic oil circulates, the active filter is driven by the motor independently, and the independent circulating system is still ensured to work all the time as long as the engine is started.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (10)

1. A filter device, comprising:

the oil-saving device comprises a shell (10), wherein an oil inlet (11) and an oil outlet (12) are formed in the shell (10);

the oil inlet channel (20) and the oil filtering channel (30) are arranged in the shell (10), the oil inlet channel (20) is communicated with the oil inlet (11), and the oil filtering channel (30) is communicated with the oil outlet (12);

an oil suction mechanism (40) connected to the housing (10) and located between the oil inlet passage (20) and the oil filter passage (30), the oil suction mechanism (40) being adapted to drive oil from the oil inlet passage (20) into the oil filter passage (30);

a filter structure (50) arranged in the oil filter channel (30).

2. The filtering apparatus according to claim 1, wherein the oil suction mechanism (40) is a centrifugal mechanism including an inlet (41) and an outlet (42), wherein one of the inlet (41) and the outlet (42) is provided in an axial direction of the centrifugal mechanism and the other is provided in a circumferential direction of the centrifugal mechanism, the inlet (41) communicates with the oil inlet passage (20), and the outlet (42) communicates with the oil filter passage (30).

3. A filter device as claimed in claim 2, characterised in that the inlet (41) is arranged in the axial direction of the centrifugal mechanism and the outlet (42) is arranged in the circumferential direction of the centrifugal mechanism,

the shell (10) comprises an annular side wall (13), and a top wall (14) and a bottom wall (15) which are connected to two ends of the annular side wall (13), the oil inlet (11) is arranged on the bottom wall, and the oil outlet (12) is arranged on the annular side wall (13).

4. A filter device according to claim 3, characterised in that the centrifugal mechanism is a centrifugal impeller arranged at the top wall (14), below which a separating sleeve (60) is arranged, the upper end of the separating sleeve (60) communicating with the inlet opening (31), the lower end of the separating sleeve (60) communicating with the oil inlet opening (11), the space inside the separating sleeve (60) forming the oil inlet channel (20), the space between the separating sleeve (60) and the annular side wall (13) forming the oil filter channel (30).

5. A filtering device according to claim 4, wherein said centrifugal impeller comprises a rotating shaft (43), the upper end of said rotating shaft (43) passing through said top wall (14) and being adapted to be connected to an external driving mechanism; or the separation sleeve (60) and the centrifugal impeller are in an integral structure or fixedly connected, a sealing structure (70) and a bearing (80) are arranged between the lower end of the separation sleeve (60) and the bottom wall (15), and the bearing (80) is positioned below the sealing structure (70).

6. The filter device according to claim 1, further comprising a flow guide tube (90), wherein one end of the flow guide tube (90) is connected at the oil inlet (11), and the other end of the flow guide tube (90) extends in a direction away from the housing (10).

7. A filter device as claimed in claim 4, wherein the filter structure (50) is a cylindrical filter cartridge arranged between the annular side wall (13) and the separating sleeve (60),

the bottom wall (15) is provided with a support projection (151), the support projection (151) is supported on the inner side of the bottom of the filter element, or,

the filter device further comprises an annular support plate (100), one end of the annular support plate (100) is connected with the annular side wall (13), and the other end of the annular support plate (100) is bent downwards and supported on the inner side of the top of the filter element.

8. A filter device as claimed in claim 1, characterised in that a connecting flange (110) is provided on the housing (10).

9. A hydraulic system, characterized by comprising a tank (120) and a filtering device (130) arranged on a side wall of the tank (120), the filtering device (130) being as claimed in any one of claims 1 to 8.

10. A working machine comprising a hydraulic system according to claim 9 or comprising a filter device according to any one of claims 1-8.

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