A lubricating oil filtering device for a single-shaft combustion engine

Abstract

The application discloses a lubricating oil filtering device of a single-shaft combustion engine and relates to the technical field of filtering devices.The lubricating oil filtering device comprises a filter cartridge and a filter core, the filter core is located inside the filter cartridge, the filter core is coaxially arranged with the filter cartridge, the filter core takes a filter screen cartridge as a framework, the unsealed end of the filter screen cartridge is fixed on the filter cover of the filter cartridge, a piston plate is slidably arranged inside the filter screen cartridge, and the surface of the piston plate is fixedly provided with an oil suction pipe coaxially arranged with the piston plate.The filter core is internally provided with a reciprocally movable piston plate;the filter core is further fixedly provided with a filter screen cartridge coaxially arranged with the filter core;when the piston plate completes a linear motion along the filter screen cartridge, the piston plate will extrude the lubricating oil inside the filter core;as the oil suction amount of the oil suction pipe is fixed and the hole size of the filter screen cartridge is fixed, the lubricating oil which has not been sucked away will be extruded, thereby forming a back flush to the filter core;the process can realize the cleaning of the filter core, prolong the service life of the filter core and ensure the normal oil suction process.

Description

Technical Field

[0001] This invention relates to the field of filtration device technology, and in particular to a lubricating oil filtration device for a single-shaft gas turbine. Background Technology

[0002] A single-shaft gas turbine refers to a gas turbine in which the compressor and gas turbine (including the power turbine) share a single rotor. All core rotating components are connected in series on the same shaft and operate synchronously. The rotating shaft of a single-shaft gas turbine requires lubrication, so lubricating oil is needed.

[0003] Based on research and existing technology findings, it has been discovered that lubricating oil can become contaminated with impurities (such as metal shavings, dust, sludge, etc.) during storage, transportation, and use. These impurities directly threaten equipment and the oil itself. Therefore, lubricating oil needs to be filtered. The lubricating oil filtration device for single-shaft gas turbines is generally installed externally. For example, Chinese Patent No. CN111013218B discloses a lubricating oil recycling device for a burner, including a body. The body contains a filtration and cleaning device, which includes a filter screen. A cooling and circulation device is also provided below the filtration and cleaning device. This patent includes a filtration and cleaning device to filter used lubricating oil, enabling reuse. After filtration, the filter screen is cleaned to prevent residual lubricating oil from remaining for a long time and affecting the normal operation of the device. The cooling and circulation device below the filtration and cleaning device cools the lubricating oil to prevent the lubricating oil temperature from being too high and affecting the burner performance. This device has high processing efficiency and a wide range of applications.

[0004] In current industrial equipment and power machinery, filter cartridge technology is widely used for filtering impurities in lubricating oil. This technology, based on the core principle of physical interception, uses porous filter media (such as glass fiber and composite filter paper) inside the filter cartridge to trap impurities such as metal shavings, dust, and colloids in the lubricating oil. This is a crucial step in ensuring the cleanliness of the lubricating oil and extending the service life of equipment. The filtration performance of a filter cartridge is closely related to its structure. Most mainstream filter cartridges on the market adopt a folded filter media design, increasing the effective filtration area and improving filtration efficiency per unit time. However, this structure also has inherent limitations: impurities trapped by the filter accumulate directly in the gaps between the folds of the filter media. Over time, these impurities gradually clog the pores. Clogged pores increase filtration resistance, reducing filtration efficiency and potentially causing poor lubricating oil circulation. If not replaced in time, this will ultimately shorten the overall service life of the filter cartridge and increase the cost of replacing consumables in the equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a lubricating oil filtration device for a single-shaft gas turbine to solve the problems mentioned in the background art.

[0006] The technical solution of the present invention is: a lubricating oil filtration device for a single-shaft gas turbine, comprising a filter cylinder and a filter element, wherein the filter element is located inside the filter cylinder and is coaxially arranged with the filter cylinder, the filter element is framed by a filter screen cylinder, the unclosed end of the filter screen cylinder is fixed to the filter cover of the filter cylinder, a piston plate is slidably arranged inside the filter screen cylinder, an oil suction pipe is fixed on the surface of the piston plate and coaxially arranged therewith, a guide structure is provided between the filter cover of the filter cylinder and the oil suction pipe, and a drive mechanism for reciprocating linear movement of the piston plate is provided on the top of the filter cover of the filter cylinder;

[0007] The filter cartridge has multiple positioning rods fixed inside, and each positioning rod is fixed together with multiple conical covers that are sleeved and fixed at the same time as the filter cartridge. The filter element is located at the center of the conical cover. The inner ring of the conical cover does not contact the filter element, and the outer ring of the conical cover does not contact the inner wall of the filter cartridge.

[0008] The multiple conical covers are linearly distributed along the axial direction, with the bottoms of two adjacent conical covers close to each other and the tops far apart. Each pair of adjacent conical covers forms an annular channel that is wider at the top and narrower at the bottom, and the multiple channels form an annular settlement space that is wider at the top and narrower at the bottom.

[0009] Preferably, an oil inlet pipe is fixed to one side of the top of the filter cartridge and is connected thereto. The central axis of the oil inlet pipe is set horizontally and the oil inlet pipe is set along the tangential direction of the filter cartridge body.

[0010] Preferably, a hydraulic gauge is fixed to the top of the filter cover of the filter cartridge, and the detection end of the hydraulic gauge is located inside the filter cartridge.

[0011] Preferably, the guiding structure includes a discharge pipe and a corrugated pipe. The discharge pipe is integrally inserted and fixed on the filter cover of the filter cartridge, and the two ends of the corrugated pipe are respectively sleeved and fixed on the oil suction pipe and the discharge pipe.

[0012] Preferably, the driving mechanism includes a guide structure, which includes multiple guide rods. The two ends of the guide rods are respectively fixed to the two ends of the filter screen cylinder, and the piston plate is slidably sleeved on each guide rod.

[0013] Preferably, the drive mechanism further includes a reciprocating lead screw, and the bottom end of the filter cylinder and the filter cover of the filter cylinder are provided with rotating holes. The two ends of the reciprocating lead screw are respectively rotatably installed in the two rotating holes. The piston plate is inserted and fixed with a lead screw nut sleeve that is compatible with the reciprocating lead screw, and the lead screw nut sleeve is installed on the reciprocating lead screw. The filter cover of the filter cylinder is fixed with a servo motor, and the output shaft of the servo motor is coaxially fixed with the reciprocating lead screw.

[0014] The present invention provides an improved lubricating oil filtration device for a single-shaft gas turbine, which, compared with the prior art, has the following improvements and advantages:

[0015] Firstly, the filter element of this invention has a reciprocating piston plate inside, which is coaxially fixed with the oil suction pipe. A filter screen cylinder, also coaxial with the filter element, is also fixed inside. When the piston plate completes one linear movement along the filter screen cylinder, it squeezes the lubricating oil inside the filter element. Since the oil suction capacity of the oil suction pipe is fixed, and the mesh size of the filter screen cylinder is fixed, any lubricating oil that has not been suctioned out will be squeezed out, thus creating a backflow on the filter element. This process cleans the filter element, extends its service life, and ensures the normal operation of the oil suction process.

[0016] Secondly, the present invention has multiple coaxially arranged conical hoods inside the filter cartridge and outside the filter element, which are linearly distributed along the axial direction (the filter element and the conical hoods are coaxial); the bottoms of two adjacent conical hoods are close to each other, while the tops are far apart, forming an annular settling space that is wider at the top and narrower at the bottom; when the filter element is backflushed, the impurities flushed out will enter the settling space between adjacent conical hoods, and settle by taking advantage of the reduced fluid velocity in the space; during the oil suction process, due to the wide spacing between the tops of the conical hoods and the narrow spacing between the bottoms, the impurities are not easily sucked towards the filter element due to their own gravity and the flow field guidance; at the same time, the lubricating oil entering the filter cartridge will first flow through the settling area between the conical hoods to complete the initial settling, and then enter the filter element for filtration, thereby achieving secondary filtration;

[0017] Thirdly, when the lubricating oil is pumped into the filter cartridge from the outside, the oil inlet pipe is set along the tangent of the filter cartridge body, causing the lubricating oil to flow into the filter cartridge in a vortex. At this time, the internal impurities of the lubricating oil are distributed on the periphery by the centrifugal force. Combined with the setting of various conical shrouds, the conical shrouds can easily intercept solid impurities in the lubricating oil, making it easy for them to settle.

[0018] Fourth, the lubricating oil enters the gap between each pair of adjacent conical shrouds to form a thin fluid environment (although the gap in the figure is large, in actual production, the conical shrouds are thinner and the spacing is even smaller; the gap is drawn large here for ease of illustration). The conical shrouds divide the lubricating oil into multiple narrow channels, reducing the flow rate and turbulence intensity of the lubricating oil. Particles collide with the conical shrouds and are slowed down, causing them to agglomerate. The inclined plate surface provides attachment and collision sites for tiny particles, making it easier for small particles to aggregate into large particles and settle. At the same time, under the centrifugal force, large particles are easily thrown to the edge of the filter cartridge. Meanwhile, the lubricating oil flow slows down, reducing the risk of settled particles being re-washed. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the installation of each conical cover of the present invention;

[0022] Figure 3 This is a schematic diagram of the filter element position distribution according to the present invention;

[0023] Figure 4 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0024] Figure 5 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 6 for Figure 4 A magnified structural diagram at point A;

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of the conical cover of the present invention;

[0027] Figure 8 This is a schematic diagram of the filter element structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the separate structure of the filter cartridge and filter cover of the present invention.

[0029] Figure label:

[0030] 1. Filter cartridge; 2. Filter cover; 3. Servo motor; 4. Hydraulic gauge; 5. Oil inlet pipe; 6. Discharge pipe; 7. Conical cover; 8. Positioning rod; 9. Filter element; 10. Filter screen cylinder; 11. Reciprocating screw; 12. Bellows; 13. Guide rod; 14. Nut sleeve; 15. Piston plate. Detailed Implementation

[0031] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides an improved lubricating oil filtration device for a single-shaft gas turbine. The technical solution of this invention is as follows:

[0033] like Figures 1 to 9As shown, this embodiment of the invention provides a lubricating oil filtration device for a single-shaft gas turbine, including a filter cylinder 1 and a filter element 9. The filter element 9 is located inside the filter cylinder 1 and is coaxially arranged with the filter cylinder 1. The filter element 9 has a filter screen cylinder 10 as its frame. The unclosed end of the filter screen cylinder 10 is fixed to the filter cover 2 of the filter cylinder 1. A piston plate 15 is slidably arranged inside the filter screen cylinder 10. An oil suction pipe is fixed on the surface of the piston plate 15 and is coaxially arranged with it. A guide structure is provided between the filter cover 2 of the filter cylinder 1 and the oil suction pipe. A drive mechanism is provided on the top of the filter cover 2 of the filter cylinder 1 to make the piston plate 15 reciprocate linearly.

[0034] It should be noted that the specific model and specifications of filter element 9 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0035] As can be seen from the above connection relationship, the filter element 9 is equipped with a reciprocating piston plate 15 inside, which is coaxially fixed with the oil suction pipe; the filter element 9 is also fixed with a filter screen cylinder 10 coaxial with it. When the piston plate 15 completes one linear movement along the filter screen cylinder 10, it will squeeze the lubricating oil inside the filter element 9; since the oil suction volume of the oil suction pipe is fixed and the pore size of the filter screen cylinder 10 is fixed, the lubricating oil that has not been sucked away will be squeezed out, thereby forming a backflow on the filter element 9; this process can clean the filter element 9, extend its service life, and ensure that the oil suction process proceeds normally.

[0036] Specifically, an oil inlet pipe 5 is fixed to one side of the top of the filter cartridge 1 and is connected thereto. The central axis of the oil inlet pipe 5 is set horizontally, and the oil inlet pipe 5 is set along the tangential direction of the filter cartridge 1.

[0037] It should be noted that the entire device has an externally installed container for storing lubricating oil, and the lubricating oil in the container is delivered into the oil inlet pipe 5 by an independent oil delivery pump.

[0038] It should be further noted that the specific model and specifications of the oil pump need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail here. The power supply and principle of the oil pump and battery are clear to those skilled in the art, and will not be described in detail here.

[0039] As can be seen from the above connection relationship, when the lubricating oil is sent into the filter cartridge 1 by the external oil pump, the lubricating oil flows into the filter cartridge 1 in a vortex shape because the oil inlet pipe 5 is set along the tangential direction of the filter cartridge 1. At this time, the internal impurities of the lubricating oil are distributed on the periphery by the help of centrifugal force.

[0040] The oil inlet pipe 5 is set along the tangent of the filter cartridge 1. The core principle is to create a vortex using the laws of fluid motion. Essentially, it is the result of the combined action of "tangential impact force + fluid inertia". The oil inlet pipe 5 is not arranged along the axial direction (central direction) of the filter cartridge 1, but is aligned with the tangential position of the inner wall of the filter cartridge 1. When the lubricating oil flows out of the oil pipe, it will directly impact the tangential direction of the inner wall of the filter cartridge 1. Due to the constraint of the inner wall of the filter cartridge 1 and the influence of the fluid's own inertia, the lubricating oil after the impact cannot flow in a straight line, but can only make a circular motion along the cylinder wall, forming a continuously rotating fluid field. During the circular motion, the fluid is subjected to centrifugal force, which will naturally form a vortex structure with "low pressure in the center and high pressure on the periphery" (similar to a vortex in water). The lubricating oil then rotates and flows in the filter cartridge 1 in a vortex shape. In this way, the centrifugal force can initially separate impurities with higher density in the oil (such as metal shavings and particulate matter), reducing the probability of impurities directly clogging the filter material.

[0041] Specifically, a hydraulic gauge 4 is fixed to the top of the filter cover 2 of the filter cartridge 1, and the detection end of the hydraulic gauge 4 is located inside the filter cartridge 1.

[0042] It should be noted that the specific model and specifications of the hydraulic gauge 4 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here. The power supply and principle of the hydraulic gauge 4 and the battery are clear to those skilled in the art, and will not be described in detail here.

[0043] Specifically, the filter cartridge 1 has multiple positioning rods 8 fixed inside, and each positioning rod 8 is fixed to multiple conical covers 7 that are sleeved and fixed at the same time as the filter cartridge 1. The filter element 9 is located at the center of the conical cover 7. The inner ring of the conical cover 7 does not contact the filter element 9, and the outer ring of the conical cover 7 does not contact the inner wall of the filter cartridge 1. The multiple conical covers 7 are linearly distributed along the axial direction, and the bottoms of two adjacent conical covers 7 are close to each other, while the tops are far apart from each other. Each pair of adjacent conical covers 7 forms an annular channel that is wider at the top and narrower at the bottom. The multiple channels form an annular settling space that is wider at the top and narrower at the bottom.

[0044] It should be noted that, such as Figure 2 and Figure 7 To better illustrate the distribution of the conical cover 7, the conical cover 7 is drawn relatively thick. In actual applications, the thickness of the conical cover 7 is between five and ten millimeters, and the distribution is relatively dense.

[0045] As can be seen from the above connection relationship, multiple coaxially arranged conical shrouds 7 are provided inside the filter cartridge 1 and outside the filter element 9, and are linearly distributed along the axial direction (the filter element 9 and the conical shrouds 7 are kept coaxial). The bottoms of two adjacent conical shrouds 7 are close to each other, while the tops are far apart, forming an annular settling space that is wider at the top and narrower at the bottom. When the filter element 9 is backflushed, the impurities flushed out will enter the settling space between adjacent conical shrouds 7, and settle by taking advantage of the reduced fluid velocity in the space. During the oil suction process, because the top spacing of the conical shrouds 7 is wide and the bottom spacing is narrow, the impurities are not easily sucked towards the filter element 9 due to their own gravity and flow field guidance. At the same time, the lubricating oil entering the filter cartridge 1 will first flow through the settling area between the conical shrouds 7 to complete the initial settling, and then enter the filter element 9 for filtration, thereby achieving secondary filtration.

[0046] To further explain the sedimentation principle of the conical cover 7 described above, lubricating oil enters the gap between every two adjacent conical covers 7 to form a thin fluid environment (although...). Figure 5 The gaps in the design are relatively large. In actual production, the conical cover 7 is thinner, and the gaps will be even smaller. The gaps are only shown here for ease of demonstration. Figure 5 (The gap is large). The conical shroud 7 divides the lubricating oil into multiple narrow channels, reducing the flow rate and turbulence intensity of the lubricating oil. The particles collide with the conical shroud 7 and are slowed down. The particles collide and agglomerate. The surface of the inclined plate provides attachment and collision sites for small particles. Small particles are easy to aggregate into large particles and settle more easily. At the same time, under the action of centrifugal force, large particles are easy to be thrown to the edge of the filter cartridge 1. Meanwhile, the flow of lubricating oil is slowed down, which can reduce the risk of settled particles being re-washed.

[0047] Specifically, the guiding structure includes a discharge pipe 6 and a corrugated pipe 12. The discharge pipe 6 is integrally inserted and fixed on the filter cover 2 of the filter cartridge 1, and the two ends of the corrugated pipe 12 are respectively sleeved and fixed on the oil suction pipe and the discharge pipe 6.

[0048] It should be noted that an oil pump is also independently installed on the outside of the entire device. The oil suction end of the oil pump is connected to the discharge pipe 6. The oil pump creates a negative pressure by forming a pipeline structure with the oil suction pipe, the discharge pipe 6 and the corrugated pipe 12, thereby enabling oil suction.

[0049] It should be further explained that the specific model and specifications of the oil pump need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail here. The power supply and principle of the oil pump and battery are clear to those skilled in the art, and will not be described in detail here.

[0050] Specifically, the driving mechanism includes a guide structure, which includes a plurality of guide rods 13. The two ends of the guide rods 13 are respectively fixed on the two ends of the filter screen cylinder 10, and the piston plate 15 is slidably sleeved on each guide rod 13.

[0051] As can be seen from the above connection relationship, the guide rod 13 is set so that the piston plate 15 can only move linearly in the filter cylinder 10.

[0052] Specifically, the drive mechanism also includes a reciprocating screw 11. The bottom end of the filter cylinder 10 and the filter cover 2 of the filter cylinder 1 are provided with rotating holes. The two ends of the reciprocating screw 11 are respectively rotatably installed in the two rotating holes. The piston plate 15 is inserted and fixed with a screw nut 14 that is compatible with the reciprocating screw, and the screw nut 14 is installed on the reciprocating screw 11. The filter cover 2 of the filter cylinder 1 is fixed with a servo motor 3, and the output shaft of the servo motor 3 is coaxially fixed with the reciprocating screw 11.

[0053] It should be noted that the model and specifications of the servo motor 3, reciprocating lead screw 11, and lead screw sleeve 14 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail here. The power supply and principle of the servo motor 3 and the battery are clear to those skilled in the art, and will not be described in detail here.

[0054] As can be seen from the above connection relationship, the servo motor 3 causes the reciprocating screw 11 to rotate axially through the output shaft, and the reciprocating screw 11 causes the piston plate 15 to move reciprocally linearly within the filter cylinder 10 through the matching screw nut sleeve 14.

[0055] Working principle:

[0056] The first step is that the lubricating oil is sent into the filter cartridge 1 by an external oil pump. When the lubricating oil is sent into the filter cartridge 1 by the external oil pump, the oil inlet pipe 5 is set along the tangential direction of the filter cartridge 1, so that the lubricating oil flows into the filter cartridge 1 in a vortex. At this time, the internal impurities of the lubricating oil are distributed on the periphery by centrifugal force. Combined with the setting of various conical covers 7, the conical covers 7 can easily intercept large solid impurities in the lubricating oil, so that the large solid impurities can easily settle.

[0057] The second step is to use hydraulic gauge 4 to perform hydraulic testing on the filter cartridge 1. When the hydraulic pressure reaches the specified pressure, the oil pump causes the oil suction pipe, discharge pipe 6 and bellows 12 to form a pipeline structure to generate negative pressure, thereby enabling oil suction.

[0058] Thirdly, during the second step, the servo motor 3 causes the reciprocating screw 11 to rotate axially via its output shaft. The reciprocating screw 11, through its matching nut sleeve 14, causes the piston plate 15 to reciprocate linearly within the filter cylinder 10. When the piston plate 15 completes one linear motion along the filter cylinder 10, it squeezes the lubricating oil inside the filter element 9. Since the oil suction volume of the suction pipe is fixed and the mesh size of the filter cylinder 10 is fixed, the lubricating oil that has not been sucked up will be squeezed out, thus creating a backflow on the filter element 9. This process can clean the filter element 9, extend its service life, and ensure that the oil suction process proceeds normally.

[0059] The filter cartridge 1 has multiple coaxially arranged conical shrouds 7 inside and outside the filter element 9, which are linearly distributed along the axial direction (the filter element 9 and the conical shrouds 7 are coaxial). The bottoms of two adjacent conical shrouds 7 are close to each other, while the tops are far apart, forming an annular settling space that is wider at the top and narrower at the bottom. When the filter element 9 is backflushed, the impurities flushed out will enter the settling space between adjacent conical shrouds 7 and settle by taking advantage of the reduced fluid velocity in the space. During the oil suction process, because the top spacing of the conical shrouds 7 is wide and the bottom spacing is narrow, the impurities are not easily sucked towards the filter element 9 due to their own gravity and the flow field. At the same time, the lubricating oil entering the filter cartridge 1 will first flow through the settling area between the conical shrouds 7 to complete the initial settling, and then enter the filter element 9 for filtration, thereby achieving secondary filtration.

[0060] In summary, existing filters require regular cleaning, in conjunction with the attached... Figure 1-4 and appendix Figure 9 As can be seen, both the filter cover and the filter cartridge are equipped with positioning ears that are integral with each other. The positioning ears of the filter cover and the filter cartridge are aligned. Through holes are opened on the outside of the positioning ears. Bolts pass through the two aligned through holes (the bolts are not shown in the figure). Nuts are installed on the bolts, so that the filter cover and the filter cartridge are pressed together (a rubber ring can be placed between the filter cover and the filter cartridge to improve the sealing). When cleaning, simply remove the bolts, separate the filter cover and the filter cartridge, and clean them separately.

[0061] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lubricating oil filtering device for a single-shaft combustion engine, comprising a filter cartridge (1) and a filter element (9), characterized in that: The filter core (9) is located inside the filter cartridge (1), and the filter core (9) is coaxially arranged with the filter cartridge (1), the filter core (9) takes the filter screen cylinder (10) as a framework, the unsealed end of the filter screen cylinder (10) is fixed on the filter cover (2) of the filter cartridge (1), the inside of the filter screen cylinder (10) is slidably provided with a piston plate (15), the plate surface of the piston plate (15) is fixedly provided with an oil suction pipe coaxially arranged therewith, the filter cover (2) of the filter cartridge (1) and the oil suction pipe are provided with a guide structure, and the top of the filter cover (2) of the filter cartridge (1) is provided with a driving mechanism for enabling the piston plate (15) to move linearly back and forth. A plurality of positioning rods (8) are fixedly arranged inside the filter cartridge (1), each positioning rod (8) is commonly fixed with a plurality of conical covers (7) which are fixedly sleeved and arranged with the filter cartridge (1), the filter core (9) is located at the center of the conical cover (7), the inner ring of the conical cover (7) is not in contact with the filter core (9), and the outer ring of the conical cover (7) is not in contact with the inner wall of the filter cartridge (1). The plurality of conical covers (7) are linearly distributed along the axial direction, the bottoms of the two adjacent conical covers (7) are close to each other, and the tops are away from each other, each two adjacent conical covers (7) form an annular channel which is wide at the top and narrow at the bottom, and a plurality of channels form an annular settling space which is wide at the top and narrow at the bottom. The top side of the filter cartridge (1) is fixedly provided with an oil inlet pipe (5) which is in communication therewith, the central axis of the oil inlet pipe (5) is horizontally arranged, and the oil inlet pipe (5) is arranged along the tangent direction of the filter cartridge (1) body.

2. A lubricating oil filter device for a single-shaft combustion engine according to claim 1, characterized in that: The top of the filter cover (2) of the filter cartridge (1) is fixedly provided with a hydraulic pressure gauge (4), and the detection end of the hydraulic pressure gauge (4) is located inside the filter cartridge (1).

3. A lubricating oil filter device for a single-shaft combustion engine according to claim 1, characterized in that: The guide structure comprises a discharge pipe (6) and a bellows (12), the discharge pipe (6) is integrally inserted and fixed on the filter cover (2) of the filter cartridge (1), and the two ends of the bellows (12) are fixedly sleeved on the oil suction pipe and the discharge pipe (6) respectively.

4. The lubricating oil filter apparatus for a single-shaft combustion engine according to claim 1, characterized by: The driving mechanism comprises a guide structure, the guide structure comprises a plurality of guide rods (13), the two ends of the guide rod (13) are fixed on the two ends of the filter screen cylinder (10) respectively, and the piston plate (15) is slidably sleeved on each guide rod (13).

5. A lubricating oil filter arrangement for a single shaft combustion engine according to claim 4, characterized in that The driving mechanism further comprises a reciprocating screw rod (11), the bottom end of the filter screen cylinder (10) and the filter cover (2) of the filter cartridge (1) are both provided with rotating holes, the two ends of the reciprocating screw rod (11) are rotatably installed in the two rotating holes respectively, the plate surface of the piston plate (15) is inserted and fixed with a nut sleeve (14) matched with the reciprocating screw rod, the nut sleeve (14) is installed on the reciprocating screw rod (11), the filter cover (2) of the filter cartridge (1) is fixedly provided with a servo motor (3), and the output shaft of the servo motor (3) is coaxially fixed with the reciprocating screw rod (11).

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