Papermaking raw material deoiling equipment with filtering function

Abstract

The utility model relates to the technical field of papermaking technology, in particular to papermaking raw material deoiling equipment with a filtering function, which comprises a first filtering barrel and a second filtering barrel, a stand column is welded on one side of the first filtering barrel, and the highest point of the top of the stand column is connected with an air cylinder through a bolt. The power output end of the air cylinder is fixedly connected with the top of an opening and closing cover through a bolt, and the opening and closing cover is located above the first filter barrel and connected with the first filter barrel in an inserted mode. According to the improved deoiling equipment, the inner barrel structure prolongs the contact time of raw materials and the filter screen, preliminary separation of grease is facilitated, the bottom protrusion of the pressing block improves the grease separation effect, the supporting block improves the supporting performance, meanwhile, the inner space is reasonably utilized, precise separation is achieved in cooperation with the second filter barrel discharging structure, and the papermaking process refinement and the resource utilization rate are improved; the air cylinder drives the opening and closing cover to be opened and closed conveniently, sealing is good, pressure is stabilized, the deoiling and operation effects are improved, the inner barrel and the pipe opening one-way valve are of a quick-release structure, maintenance and management are convenient, and long-term stable operation is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of papermaking technology, specifically to a papermaking raw material degreasing device with filtration function. Background Technology

[0002] Papermaking is the process of making paper from plant fiber raw materials or other suitable raw materials through a series of complex chemical and physical treatment steps.

[0003] The presence of grease can have many adverse effects on the papermaking process, such as affecting the bonding force between fibers and causing a decrease in paper strength. Papermaking raw material degreasing equipment is a device specifically designed to remove grease components from papermaking raw materials. After cooking, the degreasing equipment separates the grease from the recycled raw materials, reducing the grease content in the raw materials.

[0004] In the process of developing this utility model, the inventors discovered the following problems with the existing technology: 1. When processing papermaking raw materials, grease and impurities in existing equipment tend to adhere to the filter components, which can clog the filter screen over time, affecting filtration efficiency. In order to ensure a closed chamber during processing, traditional equipment uses integrated or cumbersome disassembly of its filter components, making cleaning very troublesome. Some equipment even requires shutdown for disassembly, increasing maintenance costs and downtime. 2. At the same time, existing equipment may only have one discharge port, which cannot accurately separate and discharge grease, raw materials filtered to different degrees, etc. This leads to the need for additional steps to process the mixed materials in subsequent papermaking processes, reducing production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a papermaking raw material degreasing device with filtration function, to solve the problems mentioned in the background art, such as the easy adhesion of grease and impurities to the filter components, and the fact that the filter components are either integral or cumbersome to disassemble, and cannot be separated according to the characteristics of different raw materials. To achieve the above objective, this utility model provides the following technical solution: a papermaking raw material degreasing device with filtration function, including a first filter barrel and a second filter barrel. A column is welded to one side of the first filter barrel, and a cylinder is bolted to the highest point of the column. The power output end of the cylinder is fixedly connected to the top of an opening and closing cover by bolts. The opening and closing cover is located above the first filter barrel and is inserted into it. A support block is fixedly connected to the bottom wall of the first filter barrel, and an inner barrel is attached to the top of the support block. The inner barrel has a threaded post at its bottom axis that corresponds to a threaded post at the axis of the support block. The opening and closing cover is connected by a threaded groove. A pressure cover is fixedly connected to the bottom of the opening and closing cover. The pressure cover is located on the top of the inner barrel and fits against it. A pressure block is provided inside the inner barrel. A worm and a worm wheel are rotatably connected to the top of the pressure cover. The worm and the worm wheel are meshed together. A lead screw is threaded to the shaft of the worm wheel. One end of the lead screw passes through the opening and closing cover and the pressure cover and is integrally connected to the top of the pressure block. One side of the first filter barrel and the top of the second filter barrel are connected to a gear pump via a conveying pipe. An oil outlet pipe, a first discharge pipe and a second discharge pipe are respectively opened on one side of the second filter barrel from top to bottom.

[0006] More preferably, the top of the second filter barrel is provided with a cover that is threadedly connected to it by flange bolts, and a viewing window with tempered glass is opened on one side of the second filter barrel. The opening and closing cover is moved up and down on the top of the first filter barrel by a cylinder to form an opening and closing structure. At the same time, the axis of the first filter barrel and the opening and closing cover are located on the same vertical center line. The outer walls of the opening and closing cover and the first filter barrel, as well as the inner barrel and the pressure cover, are covered with rubber strips that fit tightly against each other.

[0007] More preferably, the diameter of the inner barrel is smaller than the inner diameter of the first filter barrel, and the outer wall of the inner barrel has a structure in which a grid-like filter screen is opened at equal angles on the surface.

[0008] More preferably, the support block is composed of a one-piece circular part made of stainless steel and cylindrical parts of the same material distributed in a cross shape at the bottom of the circular part. The top circular part of the support block is wider at the top and narrower at the bottom. The surface of the top circular part of the support block has an annular and inclined drainage groove. The drainage groove is higher at one end from the axis of the support block and lower at the other end from the inner wall of the first filter barrel. A pressure sensor is provided on the bottom wall of the support block.

[0009] More preferably, the lead screw and the worm gear form a helical transmission structure, and the pressure block moves up and down in the cavity between the inner barrel and the pressure cap through the lead screw.

[0010] More preferably, the axial center points of the cap, the block, and the inner barrel are located on the same vertical center line, and the bottom of the block has several semi-circular protrusions arranged in a ring.

[0011] More preferably, the end of the conveying pipe adjacent to the first filter barrel is L-shaped and extends to the bottom wall of the first filter barrel. The conveying pipe, oil outlet pipe, first discharge pipe, and second discharge pipe are all equipped with one-way valves. Furthermore, the inner wall of the second filter barrel is threaded with a filter sleeve corresponding to the outer wall of the openings of the first and second discharge pipes. Simultaneously, the mesh diameter of the filter sleeve surface is smaller than the mesh diameter of the inner barrel surface.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] In this invention, the special structure of the inner barrel extends the contact time between the raw material and the filter screen, allowing the raw material to begin initial separation of grease upon entering the inner barrel. This creates favorable conditions for subsequent pressure separation. The semi-circular protrusion at the bottom of the pressure block increases the contact points and friction with the raw material during pressure application, enabling the grease in the raw material to be squeezed out more fully, further improving the grease separation effect. The shape and structure of the support block effectively utilize the internal space while applying pressure. With the help of the visible window on the outer wall of the second filter barrel and the discharge pipes and filter sleeves of different positions and specifications, the grease and raw materials of different qualities can be accurately separated and processed separately according to the layered structure of the pulp and oil mixture. This greatly improves the precision and resource utilization of the subsequent papermaking process, laying the foundation for the production of high-quality paper.

[0014] In this invention, the opening and closing cover is achieved by a cylinder to lift and lower, forming an opening and closing structure with the first filter barrel. The operation is simple and fast. Moreover, based on the plug-in connection and rubber strip sealing, a double sealing effect is formed, which not only avoids leakage during the raw material processing, but also ensures that the internal pressure of the equipment maintains a stable pressure during the processing, which is conducive to improving the degreasing effect and the stability of equipment operation. The inner barrel and the support block are installed by a threaded connection. When cleaning or maintenance is required, the inner barrel can be quickly removed from the support block, which greatly reduces the difficulty and time cost of equipment maintenance. All pipe ports are equipped with one-way valves, and the pipe port filter sleeves are removable. These structures facilitate the operation and management of the equipment and the regular cleaning or replacement of parts to maintain good filtration and operation effects and ensure the long-term stable operation of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the second filter barrel of this utility model;

[0017] Figure 3This is a schematic diagram of the internal structure of the first filter barrel of this utility model;

[0018] Figure 4 This is a schematic diagram of the top structure of the opening and closing cover of this utility model;

[0019] Figure 5 This is a schematic diagram of the bottom structure of the inner barrel and the pressing block of this utility model.

[0020] In the diagram: 1. First filter barrel; 2. Second filter barrel; 3. Column; 4. Cylinder; 5. Opening and closing cover; 6. Support block; 7. Inner barrel; 8. Pressure cover; 9. Pressure block; 10. Worm gear; 11. Worm wheel; 12. Lead screw; 13. Conveying pipe; 14. Oil outlet pipe; 15. First discharge pipe; 16. Second discharge pipe; 17. Pipe filter sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 5 This utility model provides a technical solution: a papermaking raw material degreasing device with filtration function, including a first filter barrel 1 and a second filter barrel 2. A column 3 is welded to one side of the first filter barrel 1. A cylinder 4 is bolted to the highest point of the column 3. The power output end of the cylinder 4 is fixedly connected to the top of the opening and closing cover 5 by bolts. The opening and closing cover 5 is located above the first filter barrel 1 and is inserted into it. A support block 6 is fixedly connected to the bottom wall of the first filter barrel 1. An inner barrel 7 is attached to the top of the support block 6. The inner barrel 7 is threadedly connected to the threaded groove corresponding to the axis of the support block 6 through a threaded post at the bottom axis. A pressure cap 8 is fixedly connected to the bottom of the cover 5. The pressure cap 8 is located on the top of the inner barrel 7 and fits snugly to it. A pressure block 9 is provided inside the inner barrel 7. A worm gear 10 and a worm wheel 11 are rotatably connected to the top of the pressure cap 8. The worm gear 10 and the worm wheel 11 are meshed together. A lead screw 12 is threaded at the shaft of the worm wheel 11. One end of the lead screw 12 passes through the opening and closing cover 5 and the pressure cap 8 and is integrally connected to the top of the pressure block 9. One side of the first filter barrel 1 and the top of the second filter barrel 2 are connected to the gear pump via the conveying pipe 13. An oil outlet pipe 14, a first discharge pipe 15 and a second discharge pipe 16 are respectively opened on one side of the second filter barrel 2 from top to bottom.

[0023] In this embodiment, as Figure 1 and Figure 2As shown, the second filter barrel 2 has a cover at its top, which is threadedly connected to it via flange bolts. A viewing window with tempered glass is provided on one side of the second filter barrel 2. The opening and closing cover 5 is moved up and down at the top of the first filter barrel 1 by a cylinder 4, forming an opening and closing structure. Simultaneously, the axis of the first filter barrel 1 and the opening and closing cover 5 are located on the same vertical center line. The outer walls between the opening and closing cover 5 and the first filter barrel 1, as well as between the inner barrel 7 and the pressure cover 8, are covered with tightly fitting rubber strips. When pouring raw materials into the first filter barrel 1 (i.e., the inner barrel 7), there is ample operating space. It can quickly complete the loading of raw materials, which saves a lot of time compared with the traditional method of transporting raw materials through pipelines. Moreover, the opening and closing of the cover 5 and the first filter barrel 1 are both achieved by the cylinder 4, which eliminates the need for manual tightening or loosening of multiple bolts. The operation is simple and fast. Based on the interlocking connection between the two, combined with the external rubber strips that fit tightly together, the tightness of the connection between the two is increased, which achieves a double sealing effect. The good sealing performance not only avoids leakage during the raw material processing, but also ensures that the internal pressure of the equipment remains stable during the processing.

[0024] In this embodiment, as Figure 3 As shown, the diameter of the inner barrel 7 is smaller than the inner diameter of the first filter barrel 1, and the outer wall of the inner barrel 7 has a structure with a grid-like filter screen distributed on the surface at equal angles. The diameter of the inner barrel 7 can expand the additional cavity space between it and the first filter barrel 1 to accommodate the filtered slurry and the oil stains mixed in it. The distribution structure of the through holes of the grid-like filter screen on the surface of the inner barrel 7 extends the retention time of the raw material after it enters. Compared with a completely perforated filter component, this distribution structure increases the contact time between the raw material and the filter screen, allowing the raw material to begin to separate the grease as it enters the inner barrel 7. At the same time, it creates more favorable conditions for subsequent pressure separation. For example, for papermaking raw materials with high oil content and hard texture, a longer retention time allows them to release the grease more fully during the natural penetration and preliminary filtration stages, improving the overall degreasing efficiency and accuracy, laying the foundation for the production of high-quality paper, and preventing the phenomenon of filtration efficiency fluctuations or equipment failures caused by a sudden influx of a large amount of raw material due to a completely perforated structure.

[0025] In this embodiment, as Figure 3As shown, the support block 6 consists of a one-piece circular stainless steel component and cylindrical components of the same material arranged in a cross shape at the bottom of the circular component. The top circular component of the support block 6 is wider at the top and narrower at the bottom, and the surface of the top circular component of the support block 6 has annular and inclined drainage grooves. The end of these drainage grooves is higher than the axis of the support block 6, and the end is lower than the inner wall of the first filter tank 1. A pressure sensor is installed on the bottom wall of the support block 6. Firstly, the inner tank 7 is installed to the support block 6 via a threaded connection. When cleaning the inner tank 7 is required, it can be quickly removed from the support block 6 without the need for complex tools or professional technicians, greatly reducing the difficulty and time cost of equipment maintenance. Secondly, the support... The structure of block 6 provides stable and reliable support for the inner barrel 7 during the pressurization process, ensuring that the inner barrel 7 will not deform or shift during operation, thus guaranteeing the normal operation of the filtration and separation process. The shape of the support block 6 minimizes the occupation of the internal space of the first filter barrel 1, leaving more space for raw material storage. This allows the equipment to process more papermaking raw materials within a limited volume, improving the equipment's raw material processing capacity. At the same time, the sloping drainage grooves on the surface of the support block 6 allow the filtrate to flow smoothly to the cavity of the first filter barrel 1 under the action of gravity, avoiding the problem of filtrate accumulation or poor flow at the top of the support block 6, thus ensuring the continuity and stability of the filtration process.

[0026] In this embodiment, as Figure 4 and Figure 5 As shown, the lead screw 12 and the worm gear 11 form a helical transmission structure, and the pressure block 9 moves up and down in the cavity between the inner barrel 7 and the pressure cover 8 through the lead screw 12; the worm gear 11 and the worm 10 drive the lead screw 12 to realize the up and down movement of the pressure block 9, thereby applying a stable and adjustable pressure to the surface of the raw material inside the inner barrel 7. The pressure sensor configured at the bottom of the support block 6 can monitor the pressure data in real time during the pressure application process. This data can be transmitted to the control system outside the first filter barrel 1, which can more accurately control the pressure and adapt to the processing needs of different types and oil contents of papermaking raw materials. It also reduces unnecessary wear and stress during the operation of the equipment and extends the service life of the equipment.

[0027] In this embodiment, as Figure 4 and Figure 5As shown, the center points of the pressure cap 8, pressure block 9, and inner barrel 7 are located on the same vertical center line, and the bottom of the pressure block 9 has several semi-circular protrusions arranged in a ring. When the opening and closing cap 5 is tightly connected with the first filter barrel 1, the pressure cap 8 below it can be tightly fitted with the inner barrel 7, effectively preventing the raw material inside the inner barrel 7 from leaking from the top when the pressure block 9 is pressed, and avoiding the overflow of small solid raw materials. The semi-circular protrusions at the bottom of the pressure block 9 play a key role when pressure is applied. Compared with the flat pressure block 9, it increases the contact points and friction with the raw material. During the pressure process, it can promote the oil in the raw material to be squeezed out more fully, improving the efficiency of oil separation.

[0028] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the end of the conveying pipe 13 adjacent to the first filter barrel 1 is L-shaped and extends to the inner bottom wall of the first filter barrel 1. One-way valves are installed on the conveying pipe 13, the oil outlet pipe 14, the first discharge pipe 15, and the second discharge pipe 16. A pipe port filter sleeve 17 is threadedly connected to the outer wall of the pipe openings of the first discharge pipe 15 and the second discharge pipe 16 on the inner wall of the second filter barrel 2. The mesh diameter of the pipe port filter sleeve 17 is smaller than that of the inner barrel 7. The L-shaped pipe opening structure at one end of the conveying pipe 13 allows for maximum contact with the pre-filtered slurry-oil mixture in the first filter barrel 1. Under the action of the gear pump, the mixture can be extracted more thoroughly and transported to the second filter barrel 2, reducing material residue. With the help of the viewing window on the outer wall of the second filter barrel 2, the operator can directly observe the layered structure of the internal slurry-oil mixture, thereby enabling further analysis. Depending on the location of different materials, they are discharged separately through the oil outlet pipe 14, the first discharge pipe 15, and the second discharge pipe 16. This allows for precise separation and individual processing of grease and filtered raw materials. Grease can be collected for other uses or properly disposed of, while raw materials of different qualities can be sent to different subsequent papermaking processes. This greatly improves the precision and resource utilization of the subsequent papermaking process. Adding detachable filter sleeves 17 to the first discharge pipe 15 and the second discharge pipe 16 is equivalent to adding another fine filtration line at the discharge stage. This can further intercept small impurities mixed in the discharge, ensuring that the discharged material is purer and providing higher quality raw materials for subsequent papermaking processes. At the same time, the detachable feature of the filter sleeves 17 facilitates regular cleaning or replacement to maintain a good filtration effect.

[0029] The usage and advantages of this utility model: The papermaking raw material degreasing equipment with filtration function operates as follows:

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, firstly, cylinder 4 is started, and the power output of cylinder 4 drives the opening and closing cover 5 to rise, opening the top of the first filter barrel 1. The cooked papermaking raw material, which is a mixture of pulp and solids, is poured into the first filter barrel 1, i.e., the inner barrel 7. After filling, cylinder 4 is started again, and the opening and closing cover 5 descends. The first filter barrel 1 is closed by the insertion connection and the rubber strip seal. At this time, the pressure cover 8 is tightly fitted to the top of the inner barrel 7. After the raw material enters the inner barrel 7, it is initially filtered by the mesh filter screen on the outer wall of the inner barrel 7. The diameter of the inner barrel 7 is smaller than the inner diameter of the first filter barrel 1, and the cavity space between the two can accommodate the filtered pulp and the oil mixed in it. When the power is turned on, the worm gear 10 rotates, driving the worm wheel 11 to rotate. Due to the helical transmission structure between the lead screw 12 and the worm wheel 11, the rotation of the worm wheel 11 causes the lead screw 12 to move linearly, thereby driving the pressure block 9 to descend in the cavity between the inner barrel 7 and the pressure cap 8. The pressure block 9 applies pressure to the solid raw material trapped inside. Its semi-circular convex structure at the bottom effectively increases the contact point and friction with the raw material, causing the grease in the raw material to be separated more fully from the fibers under pressure. At the same time, the pressure sensor (TRD3351) at the bottom of the support block 6 monitors the pressure in real time. The sensor can be protected by a sealed housing and has an RS485 module and a HART module. The interface allows for wireless connection to an external display device via an external wireless module, transmitting data to the external control system (WP-C803-02-23-HH) of the first filter tank 1. Operators or the control system can adjust the pressure based on pressure feedback to ensure stable and appropriate pressure, preventing damage from excessive pressure or inadequate oil separation from insufficient pressure. Opening the valve on the delivery pipe 13 starts the gear pump, and the delivery pipe 13 completely draws the pre-filtered and pressurized slurry-oil mixture from the first filter tank 1 into the second filter tank 2. A one-way valve effectively prevents backflow of the medium. After the mixture enters the second filter tank 2, due to… Since the slurry and oil have different densities, they are left to stand in the second filter tank 2 for a period of time. The layered structure of the mixture can be observed through the viewing window on the outer wall of the second filter tank 2. The lighter oil layer can be discharged from the oil outlet pipe 14 after opening the one-way valve. The raw material can be discharged through the first discharge pipe 15 and the second discharge pipe 16. The filter sleeves 17 at the pipe openings of the two pipes can further intercept fine impurities to ensure that the raw material is purer. After the processing is completed, the inner tank 7 can be disassembled by turning and twisting the threaded connection structure between its bottom and the support block 6. The inner tank 7 can be quickly removed, the filter screen on its surface can be cleaned, and the solid raw material inside can be poured out. At the same time, the filter sleeves 17 at the pipe openings can be disassembled and cleaned.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A papermaking raw material degreasing device with filtration function, comprising a first filter barrel (1) and a second filter barrel (2), characterized in that: A column (3) is welded to one side of the first filter barrel (1). A cylinder (4) is bolted to the highest point of the column (3). The power output end of the cylinder (4) is fixedly connected to the top of the opening and closing cover (5) by bolts. The opening and closing cover (5) is located above the first filter barrel (1) and is inserted into it. A support block (6) is fixedly connected to the bottom wall of the first filter barrel (1). An inner barrel (7) is attached to the top of the support block (6). The inner barrel (7) is threadedly connected to the threaded groove on the surface of the support block (6) through a threaded post at the bottom axis. A pressure cap (8) is fixedly connected to the bottom of the opening and closing cover (5). The pressure cap (8) is located on the top of the inner barrel (7). And it is fitted and connected to it. The inner barrel (7) is provided with a pressure block (9). The top of the pressure cover (8) is rotatably connected to a worm (10) and a worm wheel (11). The worm (10) and the worm wheel (11) are meshed and connected. The worm wheel (11) is threadedly connected to a lead screw (12) at the shaft center. One end of the lead screw (12) passes through the opening and closing cover (5) and the pressure cover (8) and is integrally connected to the top of the pressure block (9). One side of the first filter barrel (1) and the top of the second filter barrel (2) are connected to the gear pump via a conveying pipe (13). The second filter barrel (2) is provided with an oil outlet pipe (14), a first discharge pipe (15) and a second discharge pipe (16) from top to bottom on one side.

2. The papermaking raw material degreasing equipment with filtration function according to claim 1, characterized in that: The second filter barrel (2) is provided with a cover that is threadedly connected to it by flange bolts, and a viewing window with tempered glass is provided on one side of the second filter barrel (2). The opening and closing cover (5) moves up and down on the top of the first filter barrel (1) by a cylinder (4) and forms an opening and closing structure with it. At the same time, the axis of the first filter barrel (1) and the opening and closing cover (5) are located on the same vertical center line. The outer walls between the opening and closing cover (5) and the first filter barrel (1) and between the inner barrel (7) and the pressure cover (8) are covered with rubber strips that fit tightly against each other.

3. The papermaking raw material degreasing device with filtration function according to claim 1, characterized in that: The diameter of the inner barrel (7) is smaller than the inner diameter of the first filter barrel (1), and the outer wall of the inner barrel (7) has a structure with a grid-like filter screen distributed on the surface at equal angles.

4. The papermaking raw material degreasing device with filtration function according to claim 1, characterized in that: The support block (6) is composed of a one-piece circular part made of stainless steel and cylindrical parts of the same material distributed in a cross shape at the bottom of the circular part. The top circular part of the support block (6) is wider at the top and narrower at the bottom. The surface of the top circular part of the support block (6) has an annular and inclined drainage groove. The end of the drainage groove is higher than the axis of the support block (6) and lower than the end of the groove is lower than the inner wall of the first filter barrel (1). A pressure sensor is provided on the bottom wall of the support block (6).

5. The papermaking raw material degreasing device with filtration function according to claim 1, characterized in that: The lead screw (12) and the worm gear (11) form a helical transmission structure, and the pressure block (9) moves up and down in the cavity between the inner barrel (7) and the pressure cover (8) through the lead screw (12).

6. The papermaking raw material degreasing device with filtration function according to claim 1, characterized in that: The axial center points of the cap (8), the block (9) and the inner barrel (7) are located on the same vertical center line, and the bottom of the block (9) is provided with several semi-circular protrusions distributed in a ring.

7. The papermaking raw material degreasing device with filtration function according to claim 1, characterized in that: The end of the conveying pipe (13) adjacent to the first filter barrel (1) is L-shaped and extends to the bottom wall of the first filter barrel (1). The conveying pipe (13), the oil outlet pipe (14), the first discharge pipe (15) and the second discharge pipe (16) are all equipped with one-way valves. The inner wall of the second filter barrel (2) is threaded with a pipe port filter sleeve (17) corresponding to the outer wall of the pipe port of the first discharge pipe (15) and the second discharge pipe (16). At the same time, the mesh diameter of the pipe port filter sleeve (17) is smaller than the mesh diameter of the inner barrel (7).

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