External oil absorption oil filter

Abstract

The utility model provides an external oil absorbing and filtering device which comprises a mounting frame, a three-stage filtering assembly, a front magnetic filtering unit, a cyclone separation conical cylinder, a composite filtering cylinder and a two-position three-way reversing mechanism. The composite filter cylinder comprises a main cylinder body, a first filter pipe, a second filter pipe, a filter element and an oil outlet pipe. The two-position three-way reversing mechanism drives a piston rod and a sealing plug disc through a hydraulic cylinder to achieve filter pipe switching. The front magnetic filter unit adsorbs magnetic impurities through a permanent magnet insertion rod, and a filter basket intercepts large particles; the cyclone separation conical cylinder separates and settles impurities by using centrifugal force, and the slag discharge pipe is cleaned regularly; and the composite filter cartridge ensures continuous filtration through alternate work of the double filter elements. The oil filter solves the problems that a traditional oil filter is low in filtering efficiency, a filter element needs to be replaced in a shutdown mode, and maintenance is inconvenient, and multi-stage deep filtering, shutdown-free maintenance and efficient impurity separation are achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil suction and filtration technology, and in particular to an external oil suction filter. Background Technology

[0002] In hydraulic systems used in power, chemical, and other fields, the EH oil station serves as a core power unit, and the cleanliness of its oil directly affects the system's reliability and lifespan. Currently, existing EH oil stations have their suction filters located inside the oil tank to intercept large particles of impurities and protect the oil pump. However, maintenance requires opening the oil tank, posing a risk of oil contamination. Furthermore, existing EH oil stations suffer from insufficient filtration efficiency, poor maintenance convenience, or complex structures, and require system shutdown for filter replacement. These issues make it difficult to meet the long-term stable operation requirements of high-pressure, high-precision hydraulic systems.

[0003] A Chinese patent with publication number CN218151808U discloses an external suction oil filter, mainly comprising an L-shaped housing: a vertical section for oil inlet with an oil inlet at the top, a horizontal section for oil outlet with an oil outlet at the end; a filter element located in the oil outlet section: one end is sealed to the end cover, and the other end is connected to the oil outlet; a shut-off valve: including a spring, steel ball, push rod, and annular seal, controlling the opening and closing of the oil inlet and outlet sections; and a coarse filter element: located in the oil inlet section to intercept large particulate impurities. Oil enters the oil inlet section through the inlet, flows into the oil outlet section through the shut-off valve, is filtered by the filter element, and is discharged from the outlet. When replacing the filter element, the shut-off valve is closed, and the end cover is opened to pull out the filter element laterally without disassembling the main equipment. This design is for coal mine tunnel drilling rigs and does not consider the structural requirements of other hydraulic systems such as EH oil stations. The filter element has a multi-layered tubular structure, which may increase oil flow resistance. The contact seal between the steel ball and the annular seal is susceptible to wear from impurities, leading to a risk of leakage.

[0004] In response to the aforementioned technologies, an external suction oil filter is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes an external suction oil filter, which solves the problems of low filtration efficiency, need to stop the machine to replace the filter element and inconvenient maintenance of traditional oil filters, and realizes multi-stage deep filtration, maintenance without stopping the machine and efficient separation of impurities.

[0006] To solve the above technical problems, the technical solution adopted by this utility model is: an external suction oil filter, including: a mounting frame, on which a three-stage filtration assembly is fixedly installed, the three-stage filtration assembly including a pre-magnetic filter unit, a cyclone separation cone and a composite filter cartridge, and a two-position three-way reversing mechanism is slidably installed inside the composite filter cartridge;

[0007] The composite filter cartridge includes a main cylinder. Two filter tubes are fixedly connected to the side of the main cylinder away from the cyclone separator cone. The filter tubes include a first filter tube and a second filter tube. The first filter tube is located above the second filter tube. A filter element is screwed to the end of the filter tube away from the main cylinder. An oil outlet pipe is fixedly connected between the two filter tubes. A valve is provided on the oil outlet pipe and it is fixedly connected to an external suction pump.

[0008] The two-position three-way reversing mechanism includes a hydraulic cylinder fixedly installed at the bottom of the main cylinder and a damping spring fixedly installed on the inner wall of the top of the main cylinder. The other end of the damping spring is fixedly connected to a piston rod. Two sealing discs are fixedly installed at intervals along the length of the piston rod. The sealing discs are located below the two filter tubes and the main cylinder respectively. The output end of the hydraulic cylinder extends into the interior of the main cylinder and is fixedly connected to the piston rod through a coupling.

[0009] Preferably, one side of the pre-magnetic filter unit is fixedly connected to the oil tank via a connecting pipe, and the other side of the pre-magnetic filter unit is fixedly connected to a cyclone separation cone via a connecting pipe. The top of the cyclone separation cone is fixedly connected to a composite filter cartridge via a connecting pipe, and the bottom of the cyclone separation cone is fixedly connected to a slag discharge pipe with a valve on it.

[0010] Preferably, a one-way valve is provided at the connection point between the first filter tube and the second filter tube and the main cylinder.

[0011] Preferably, the pre-filter magnetic unit includes a permanent magnet insert rod, an upper end cover, a filter basket, and an outer cylinder shell. The permanent magnet insert rod consists of three magnetic rods. The permanent magnet insert rod is inserted into the upper end cover. The upper end cover is fixedly installed on the top of the outer cylinder shell by bolts. The filter basket is snapped onto the inner wall of the outer cylinder shell. The height of the filter basket is higher than the connection between the pre-filter magnetic unit and the oil tank. The bottom end of the outer cylinder shell is designed as a funnel-shaped structure and is equipped with a valve.

[0012] Preferably, a suction pump is provided at the pipe connection between the cyclone separator cone and the composite filter cartridge, and at the pipe connection between the oil outlet pipe and the filter cartridge.

[0013] Preferably, the sealing discs include a first sealing disc and a second sealing disc, with the first sealing disc located above the second sealing disc, and the first sealing disc and the second sealing disc at least one of the filter tubes.

[0014] Compared with the prior art, the beneficial effects of this utility model include: improving oil purification efficiency through a three-stage filtration structure (pre-magnetic filtration, cyclone separation, and dual-filter fine filtration); the synergistic effect of magnetic adsorption and cyclone separation reduces the probability of filter element clogging; the two-position three-way reversing mechanism enables online switching of filter elements, avoiding downtime maintenance that affects production continuity; the vertical layout of the dual filter elements (the first filter tube is located above the second filter tube) combined with a one-way valve design ensures that oil sludge drips in a directional manner when the filter element is replaced, preventing contamination; the slag discharge pipe of the cyclone separation cone discharges sludge independently, reducing the risk of secondary contamination from impurities; and the modular structure design facilitates the disassembly and maintenance of each component. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0016] Figure 1 The schematic diagram shows the overall structure of an external suction oil filter according to one embodiment of the present invention.

[0017] Figure 2 The schematic diagram shows a structural schematic of a three-stage filtration assembly according to one embodiment of the present invention.

[0018] Figure 3 The diagram schematically shows an exploded view of a two-position three-way reversing mechanism according to one embodiment of the present invention.

[0019] Figure 4 The diagram schematically shows a cross-sectional view of a pre-magnetic filter unit according to one embodiment of the present invention.

[0020] Figure 5 The schematic diagram shows a cross-sectional view of a composite filter cartridge according to one embodiment of the present invention.

[0021] The following are the labeling elements in the diagram: 1. Mounting frame; 2. Three-stage filter assembly; 3. Pre-filter magnetic unit; 4. Cyclone separator cone; 5. Composite filter cartridge; 6. Two-position three-way reversing mechanism; 51. Main cylinder; 52. Filter tube; 521. First filter tube; 522. Second filter tube; 53. Filter element; 54. Oil outlet pipe; 64. Hydraulic cylinder; 61. Damping spring; 62. Piston rod; 63. Sealing disc; 41. Slag discharge pipe; 31. Permanent magnet insertion rod; 32. Upper end cover; 33. Filter basket; 34. Outer cylinder shell; 631. No. 1 stopper disc; 632. No. 2 stopper disc. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0023] According to one embodiment of the present invention, in conjunction with Figures 1-5 As shown, an external suction oil filter includes a mounting frame 1. The mounting frame 1 provides a stable support structure for the entire filter, ensuring that the positions of each component are fixed during operation and guaranteeing stable filtration. A three-stage filtration assembly 2 is fixedly mounted on the mounting frame 1. This three-stage filtration design can progressively and finely filter the oil, effectively improving the filtration effect and quality.

[0024] The three-stage filtration assembly 2 includes a pre-magnetic filter unit 3, a cyclone separator cone 4, and a composite filter cartridge 5. One side of the pre-magnetic filter unit 3 is fixedly connected to the oil tank via a connecting pipe. The pre-magnetic filter unit 3 includes a permanent magnet insert 31, an upper end cover 32, a filter basket 33, and an outer shell 34. The permanent magnet insert 31 consists of three magnetic rods and is inserted into the upper end cover 32. The upper end cover 32 is fixedly installed on the top of the outer shell 34 by bolts. The filter basket 33 is snapped onto the inner wall of the outer shell 34. The height of the filter basket 33 is higher than the connection between the pre-magnetic filter unit 3 and the oil tank. The bottom of the outer shell 34 is designed as a funnel-shaped structure. When the oil enters the pre-magnetic filter unit 3 from the oil tank, the permanent magnet rod 31 can adsorb magnetic impurities in the oil, while the filter basket 33 can intercept larger particles of impurities. The bottom of the funnel-shaped outer shell 34 facilitates the accumulation and cleaning of impurities, effectively reducing the amount of impurities entering the subsequent filtration stage and extending the service life of subsequent components.

[0025] On the other side of the pre-filter magnetic unit 3, a cyclone separation cone 4 is fixedly connected via a connecting pipe. The cyclone separation cone 4 uses the principle of centrifugal force to further separate the oil. After the oil enters the cyclone separation cone 4, heavier impurities will gather towards the cone wall and settle to the bottom under the action of centrifugal force. A slag discharge pipe 41 is fixedly connected to the bottom of the cyclone separation cone 4. A valve is installed on the slag discharge pipe 41. By periodically opening the valve on the slag discharge pipe 41, the settled impurities can be discharged, further reducing the impurity content in the oil and improving the efficiency of subsequent filtration.

[0026] A composite filter cartridge 5 is fixedly connected to the top of the cyclone separator cone 4 via a connecting pipe. A two-position three-way reversing mechanism 6 is slidably installed inside the composite filter cartridge 5. The composite filter cartridge 5 includes a main cylinder 51. Two filter tubes 52 are fixedly connected to the side of the main cylinder 51 away from the cyclone separator cone 4. The filter tubes 52 include a first filter tube 521 and a second filter tube 522. The first filter tube 521 is located above the second filter tube 522. A filter element 53 is screwed to the end of the filter tube 52 away from the main cylinder 51. An oil outlet pipe 54 is fixedly connected between the two filter tubes 52. The oil outlet pipe 54 is equipped with a valve and is fixedly connected to an external suction pump. One-way valves are provided at the connection points between the first filter tube 521 and the second filter tube 522 and the main cylinder 51. The one-way valves can prevent oil backflow and ensure the smooth progress of the filtration process.

[0027] After cyclone separation, the oil enters the main cylinder 51 and then undergoes final fine filtration through the filter element 53 inside the filter tube 52. The filter element 53 is screwed onto the filter tube 52 for easy replacement and maintenance. The two-position three-way reversing mechanism 6 includes a hydraulic cylinder 64 fixedly installed at the bottom of the main cylinder 51 and a damping spring 61 fixedly installed on the inner wall of the top of the main cylinder 51. The other end of the damping spring 61 is fixedly connected to a piston rod 62. Two sealing discs 63 are fixedly installed at intervals along the length of the piston rod 62. The sealing discs 63 are located below the connection points between the two filter tubes 52 and the main cylinder 51. The output end of the hydraulic cylinder 64 extends into the interior of the main cylinder 51 and is fixedly connected to the piston rod 62 via a coupling. The sealing discs 63 include a first sealing disc 631 and a second sealing disc 632. The first sealing disc 631 is located above the second sealing disc 632. The first sealing disc 631 and the second sealing disc 632 seal at least one of the filter tubes 52. The piston rod 62 is driven up and down by the hydraulic cylinder 64, which in turn moves the sealing disc 63 to switch the opening and closing of the first filter tube 521 and the second filter tube 522. When a filter element 53 needs to be replaced or cleaned, it can be switched to another filter tube 52 through the two-position three-way reversing mechanism 6 to continue the filtration work without stopping the machine, thus ensuring the continuous operation of the oil filter and improving work efficiency.

[0028] Suction pumps are installed at the pipe connections between the cyclone separator cone 4 and the composite filter cartridge 5, and at the pipe connections between the oil outlet pipe 54 and the filter pipe 52. The suction pumps provide power for the flow of oil, ensuring that the oil can smoothly pass through each stage of the filtration components to complete the entire filtration process. After multi-stage filtration, the oil is discharged through the oil outlet pipe 54. The valve on the oil outlet pipe 54 can control the flow rate of the oil to meet different usage requirements.

[0029] In this embodiment, when the external suction oil filter is working, the oil in the tank first enters the pre-magnetic filter unit 3 through the connecting pipe. The permanent magnet rod 31 adsorbs magnetic impurities in the oil, and the filter basket 33 filters larger particulate impurities. Next, the oil enters the cyclone separator cone 4, where centrifugal force causes impurities to settle and are periodically discharged through the slag discharge pipe 41. Afterward, the oil enters the main cylinder 51 of the composite filter cartridge 5. In the two-position three-way reversing mechanism 6, the hydraulic cylinder 64 drives the piston rod 62 to move up and down, driving the sealing plate 63 to move, thereby controlling the opening and closing of the first filter tube 521 and the second filter tube 522. After further filtration by the filter element 53 in the filter tube 52, the oil flows out through the oil outlet pipe 54. The valve on the oil outlet pipe 54 controls the flow rate, and the suction pump provides power for the oil flow.

[0030] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An external suction oil filter, characterized in that, include: Mounting frame, on which a three-stage filtration assembly is fixedly mounted, the three-stage filtration assembly includes a pre-magnetic filter unit, a cyclone separation cone and a composite filter cartridge, and a two-position three-way reversing mechanism is slidably mounted inside the composite filter cartridge; The composite filter cartridge includes a main cylinder. Two filter tubes are fixedly connected to the side of the main cylinder away from the cyclone separator cone. The filter tubes include a first filter tube and a second filter tube. The first filter tube is located above the second filter tube. A filter element is screwed to the end of the filter tube away from the main cylinder. An oil outlet pipe is fixedly connected between the two filter tubes. The oil outlet pipe is equipped with a valve and is fixedly connected to an external suction pump. The two-position three-way reversing mechanism includes a hydraulic cylinder fixedly installed at the bottom of the main cylinder and a damping spring fixedly installed on the inner wall of the top of the main cylinder. The other end of the damping spring is fixedly connected to a piston rod. Two sealing discs are fixedly installed at intervals along the length of the piston rod. The sealing discs are located below the two filter tubes and the main cylinder respectively. The output end of the hydraulic cylinder extends into the interior of the main cylinder and is fixedly connected to the piston rod through a coupling.

2. The external oil suction filter according to claim 1, characterized in that, One side of the pre-magnetic filter unit is fixedly connected to the oil tank via a connecting pipe, and the other side of the pre-magnetic filter unit is fixedly connected to a cyclone separation cone via a connecting pipe. The top of the cyclone separation cone is fixedly connected to a composite filter cartridge via a connecting pipe, and the bottom of the cyclone separation cone is fixedly connected to a slag discharge pipe with a valve on it.

3. The external oil suction filter according to claim 1, characterized in that, One-way valves are provided at the connection points between the first and second filter tubes and the main cylinder.

4. The external oil suction filter according to claim 1, characterized in that, The pre-filter magnetic unit includes a permanent magnet insert, an upper cover, a filter basket, and an outer shell. The permanent magnet insert consists of three magnetic rods and is inserted into the upper cover. The upper cover is fixedly installed on the top of the outer shell by bolts. The filter basket is snapped onto the inner wall of the outer shell. The height of the filter basket is higher than the connection between the pre-filter magnetic unit and the oil tank. The bottom of the outer shell is designed as a funnel shape and is equipped with a valve.

5. The external oil suction filter according to claim 1, characterized in that, Suction pumps are installed at the pipe connection between the cyclone separator cone and the composite filter cartridge, and at the pipe connection between the oil outlet pipe and the filter pipe.

6. The external oil suction filter according to claim 1, characterized in that, The sealing discs include a first sealing disc and a second sealing disc, with the first sealing disc located above the second sealing disc, and the first sealing disc and the second sealing disc sealing at least one of the filter tubes.

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