Fine filter for refined fuel oil

Abstract

The invention discloses a fine filter for refining fuel oil, and relates to the technical field of filtration. The fine filter for refined fuel oil comprises a shell assembly, the shell assembly comprises an outer cylinder, an upper cover plate and a first lower sealing plate, the upper cover plate is fixedly connected to the top end of the outer cylinder, and the first lower sealing plate is fixedly connected to the bottom end of the outer cylinder; the inner cylinder is rotationally installed at the axis position in the shell assembly, and the axis of the inner cylinder is parallel to the axis of the outer cylinder; and the annular filter screen is vertically installed in the shell assembly, and the annular filter screen is located between the inner cylinder and the outer cylinder. The dirt scraping mechanisms are arranged at the filter screen and the filter element respectively, the dirt discharging mechanism is arranged at the bottom end of the inner cylinder, accumulated dirt generated during filtering of the device is transferred into the conical containing cavity and discharged through the dirt discharging mechanism, dirt discharging work can be carried out during filtering work, shutdown treatment is not needed during dirt discharging, and the device is convenient to use. And the replacement period and the service life of the filter element and the filter screen are prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of filtration, in particular to a fine filter for refined fuel oil. Background Art

[0002] The main purpose of fuel oil refining is to improve the quality and performance of fuel oil and meet different usage requirements and environmental standards. By removing impurities, improving performance and meeting environmental standards, the comprehensive quality and use value of fuel oil can be improved. During the process of fuel oil refining, the fine filter can effectively filter out impurities in the fuel oil, but the fine filter will reduce the filtration efficiency during use because of impurities blocking the mesh.

[0003] In the existing technology, two methods are usually used to maintain the filter. One is shutdown cleaning, that is, stopping the operation of the machine, removing the filter, and replacing or cleaning it as appropriate. During the shutdown process, another machine is usually used to replace the work. The other is online cleaning, usually using backwashing technology, by adjusting the flow direction of the liquid to change the pressure difference, so that the filter can be cleaned without stopping the machine, thereby extending the maintenance cycle and service life of the filter.

[0004] However, the first method doubles the cost of the machine, and the filter needs to be replaced frequently, and the service life of the filter is short. The other method consumes a large amount of liquid to be processed during backwashing. During the fuel oil refining process, additional equipment is required to filter the fuel oil consumed by backwashing to reduce the loss of fuel oil. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a fine filter for refined fuel oil, which solves the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a fine filter for refined fuel oil, comprising: an outer shell assembly, the outer shell assembly comprises an outer cylinder, an upper cover plate and a first lower sealing plate, the upper cover plate is fixedly connected to the top end of the outer cylinder, and the first lower sealing plate is fixedly connected to the bottom end of the outer cylinder; an inner cylinder, the inner cylinder is rotatably mounted at the axis center in the outer shell assembly, and the axis of the inner cylinder is parallel to the axis of the outer cylinder; an annular filter screen, the annular filter screen is vertically mounted in the outer shell assembly, and the annular filter screen is located between the inner cylinder and the outer cylinder; a scraping mechanism, the scraping mechanism is mounted on the outer surface of the inner cylinder, the scraping mechanism comprises a scraping assembly and a suction assembly, the scraping assembly is used to scrape off the accumulated dirt on the surface of the annular filter screen, and the suction assembly is used to suck the accumulated dirt in the mesh of the annular filter screen into the inner cylinder; a sewage discharge mechanism, the interior of the lower end of the inner cylinder is provided with a conical accommodating chamber, The sewage discharge mechanism is arranged in the conical accommodating chamber, and the sewage discharge mechanism includes a driving shaft and a spiral extrusion blade. The driving shaft is rotatably arranged in the inner cylinder, the spiral extrusion blade is fixedly arranged on the surface of the driving shaft, and the outer side of the spiral extrusion blade is in contact with the inner wall of the conical accommodating chamber, and the driving shaft is used to drive the spiral extrusion blade to rotate so that the spiral extrusion blade squeezes the accumulated sewage to the bottom end of the inner cylinder; the solenoid valve, the solenoid valve is installed at the bottom end of the driving shaft, and the solenoid valve is connected with the conical accommodating chamber, when the solenoid valve is closed, the sewage discharge mechanism is sealed, and when the solenoid valve is opened, the sewage discharge mechanism is connected with the external space; the driving mechanism, the driving mechanism is arranged at the lower end of the first lower sealing plate, the driving mechanism is used to drive the inner cylinder and the driving shaft to rotate, and at the same time make the inner cylinder and the driving shaft perform reciprocating motion in the vertical direction, and the angular velocity of the driving shaft during rotation is greater than the angular velocity of the inner cylinder.

[0007] Furthermore, the scraping assembly includes: a first spiral blade, which is fixedly mounted on the outer peripheral surface of the inner cylinder, and a first spiral scraping member is fixedly mounted on the side of the first spiral blade close to the annular filter, and one side of the first spiral scraping member contacts the surface of the annular filter; when the inner cylinder rotates, the first spiral blade can push the liquid toward the lower end of the outer cylinder; the suction assembly includes: a straw, which is fixedly mounted on the inner cylinder and connected to the interior of the inner cylinder, and a through hole is formed on the first spiral scraping member, and an end of the straw away from the inner cylinder is accommodated in the through hole; a check valve is provided in the straw, and the check valve is used to prevent the liquid from flowing back from the inner cylinder to the outside of the inner cylinder.

[0008] Furthermore, a filter element is provided in the inner cylinder, and the filter element is fixedly mounted on the upper cover plate; a liquid outlet pipe is installed on the top of the filter element; a suction pump is installed on the upper cover plate, and the liquid inlet end of the suction pump is connected with one end of the liquid outlet pipe; a sealing ring is fixedly arranged on the outer peripheral surface of the top of the filter element, and the sealing ring is in contact with the inner wall of the inner cylinder; a second spiral blade is fixedly arranged on the inner surface of the inner cylinder, and a second spiral scraper is fixedly arranged on the side of the second spiral blade close to the filter element, and one side of the second spiral scraper is in contact with the surface of the filter element; when the inner cylinder rotates, the second spiral blade can push the liquid to the bottom end of the inner cylinder.

[0009] Furthermore, an isolation ring is fixedly provided on the upper surface of the first lower sealing plate, and the isolation ring is located between the inner cylinder and the annular filter; a pressure cover is fixedly provided on the top of the isolation ring, and the bottom end of the inner cylinder extends downward after passing through the pressure cover and the first lower sealing plate, and a bottom sealing cover is fixedly provided at the bottom end of the inner cylinder, and the inner cylinder is rotatably connected to the pressure cover and the first lower sealing plate; a sealing ring is fixedly provided on the outer surface of the inner cylinder, and the sealing ring is located between the inner cylinder and the isolation ring, and one end of the sealing ring is in contact with the inner surface of the isolation ring; a first one-way valve is installed on the isolation ring, and a second one-way valve is installed on the inner cylinder, and the heights of the first one-way valve and the second one-way valve are both lower than the height of the sealing ring; when the sealing ring moves upward, the first one-way valve opens and the second one-way valve closes, and when the sealing ring moves downward, the first one-way valve closes and the second one-way valve opens.

[0010] Furthermore, the diameter of the top side of the conical accommodating cavity is greater than the diameter of the bottom side; the radius of the top side of the spiral extrusion blade is greater than the radius of the bottom side; the pitch of the top side of the spiral extrusion blade is greater than the pitch of the bottom side; an overflow hole is opened on the side of the spiral extrusion blade close to the drive shaft, and the overflow hole vertically penetrates the spiral extrusion blade.

[0011] Furthermore, the drive shaft is rotatably connected to the bottom cover; a drain chamber is provided in the drive shaft, and the drain chamber passes through the bottom end of the drive shaft; a drain hole is provided on the outer surface of the bottom end of the drive shaft close to the conical accommodating chamber, and the drain hole is connected to the drain chamber; and the solenoid valve is connected to the drain chamber.

[0012] Furthermore, a bracket is provided at the bottom end of the first lower sealing plate, and the first lower sealing plate is fixed on the bracket; a first driving wheel is provided on the outer circumference of the inner cylinder, and the first driving wheel is provided on the side of the first lower sealing plate close to the bracket; the first driving wheel is rotatably installed on the bracket, and the first driving wheel is axially fixed; a first flat key is fixed on the outer circumference of the inner cylinder, and a first sliding groove is opened on the inner circumference of the first driving wheel, and the first flat key can slide in the first sliding groove; the first driving wheel is used to drive the inner cylinder to rotate.

[0013] Furthermore, a support sleeve is provided on the lower supporting plate below the bracket, and a sleeve shaft is provided on the outer circumference of the driving shaft, and the bottom end of the sleeve shaft is rotatably installed in the support sleeve; a second driving wheel is fixedly provided on the outer circumference of the sleeve shaft, and the second driving wheel is used to drive the sleeve shaft to rotate; a second flat key is fixedly provided on the outer circumference of the driving shaft, and a second sliding groove is provided on the inner circumference of the sleeve shaft, and the second flat key can slide in the second sliding groove; the bottom ends of the second flat key and the second sliding groove are both provided with inclined end surfaces.

[0014] Furthermore, a supporting slide column is fixedly provided at the bottom end of the bottom cover; a swash plate is fixedly provided on the lower supporting plate, and the angle between the swash plate and the horizontal plane is 10° to 30°; the bottom end of the supporting slide column is abutted against the surface of the swash plate, so that when the inner cylinder rotates, the height of the inner cylinder changes with the change of the contact point between the supporting slide column and the swash plate.

[0015] Furthermore, the driving mechanism includes: a motor, which is installed on a bracket; a first rotating shaft, which is fixedly connected to the axis of the motor output end, and a driving wheel is fixedly arranged on the outer circumference of the first rotating shaft; a second rotating shaft, both ends of which are rotatably installed on the bracket, and a second driven wheel, a first driven wheel and a third driven wheel are fixedly arranged on the outer circumference of the second rotating shaft in sequence from top to bottom; the driving wheel and the first driven wheel are connected by a first belt; the second driven wheel and the first driving wheel are connected by a second belt, and the radius of the second driven wheel is smaller than the radius of the first driving wheel; the third driven wheel and the second driving wheel are connected by a third belt, and the radius of the third driven wheel is larger than the radius of the second driving wheel; the radius of the second driven wheel is smaller than the radius of the third driven wheel.

[0016] The present invention has the following beneficial effects: (1) A scraping mechanism is provided at the filter screen and the filter element respectively, and a sewage discharge mechanism is provided at the bottom end of the inner cylinder, so that the accumulated sewage generated by the device during filtration is transferred to the conical accommodation chamber and discharged through the sewage discharge mechanism. Sewage discharge can also be carried out during filtration, and there is no need to stop the machine for sewage discharge, which increases the replacement cycle and service life of the filter element and filter screen.

[0017] (2) A filter element is arranged inside the inner cylinder, and a suction pipe is arranged to allow the fuel oil outside the inner cylinder to enter the inner cylinder through the suction pipe, and the fuel oil inside the inner cylinder is filtered through the filter element and then discharged. The filtered accumulated dirt settles in the conical receiving cavity, so that secondary filtration can be completed inside the device without the need for additional filtering equipment.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the outer cylinder; Figure 3 This is a schematic diagram of the straw installation position; Figure 4 Schematic diagram of the internal structure of the inner cylinder; Figure 5 Schematic diagram of the internal structure of the isolation ring; Figure 6 It is a cross-sectional view of the sewage discharge mechanism; Figure 7 for Figure 6 Enlarged schematic diagram of area A in the middle; Figure 8 for Figure 6 Enlarged schematic diagram of area B in the middle; Fig. 9 It is a schematic diagram of the cooperation between the drive shaft and the sleeve shaft; Fig.10 It is the schematic diagram of the swash plate matching; Fig.11 It is a schematic diagram of the driving mechanism structure.

[0020] In the figure, 1, outer cylinder; 2, upper cover plate; 3, first lower sealing plate; 4, suction pump; 5, liquid inlet; 6, first liquid outlet; 7, bracket; 71, lower support plate; 8, restraining cylinder; 9, upper fixed plate; 10, inner cylinder; 11, first spiral scraper; 12, first spiral blade; 13, suction pipe; 14, annular filter; 15, fixed frame; 16, liquid outlet pipe; 17, cushion cylinder; 18, isolation ring; 181, gland; 19, first one-way valve; 20, filter element; 201, sealing ring; 21, second spiral blade; 211, second spiral scraper; 22, fixing rod; 23, sealing ring; 24, second one-way valve; 25, bushing; 26, first driving wheel; 261, first slide groove ; 28. Swash plate; 29. ​​Driving mechanism; 291. Motor; 292. First rotating shaft; 293. Second rotating shaft; 294. Driving wheel; 295. First driven wheel; 296. Second driven wheel; 297. Third driven wheel; 298. First belt; 299. Second belt; 2910. Third belt; 30. First flat key; 31. Conical accommodating chamber; 32. Bottom cover; 33. Driving shaft; 331. Drain chamber; 332. Drain hole; 333. Second flat key; 34. Spiral extrusion blade; 35. Sleeve shaft; 351. Second slide groove; 352. Inclined end face; 36. Second driving wheel; 37. Support slide column; 38. Support sleeve; 39. Connecting pipe; 40. Solenoid valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] According to the following Figure 1 - Fig.11 A fine filter for refined fuel oil provided in an embodiment of the present invention is described.

[0024] See also Figure 1 - Figure 6 The embodiment of the present invention provides a technical solution: a fine filter for refined fuel oil, including a shell assembly, the shell assembly includes an outer cylinder 1, an upper cover plate 2 and a first lower sealing plate 3, the upper cover plate 2 is fixed to the top end of the outer cylinder 1, and the first lower sealing plate 3 is fixed to the bottom end of the outer cylinder 1, so that a sealed space is enclosed by the outer cylinder 1, the upper cover plate 2 and the first lower sealing plate 3, and an inner cylinder 10 is arranged in this sealed space, and the inner cylinder 10 is rotatably installed at the axis center in the shell assembly, and the axis of the inner cylinder 10 is parallel to the axis of the outer cylinder 1.

[0025] In addition, an annular filter screen 14 is installed in the outer shell assembly, and the filtering accuracy is 5μm to 10μm. In order to support the annular filter screen 14, a fixing frame 15 is fixedly provided on the side of the annular filter screen 14 close to the outer cylinder 1, and the annular filter screen 14 is installed on the fixing frame 15, and the annular filter screen 14 is installed vertically so that the axis of the annular filter screen 14 is parallel to the axis of the inner cylinder 10, and the annular filter screen 14 is located between the inner cylinder 10 and the outer cylinder 1. The lower part of the annular filter screen 14 is fixed to a cushioning cylinder 17, and the cushioning cylinder 17 is used to raise the installation height of the annular filter screen 14. The upper end of the annular filter screen 14 is fixed on the upper cover plate 2. When in use, the fuel oil enters the space between the annular filter screen 14 and the inner cylinder 10 from the liquid inlet 5 on the upper cover plate 2, and then enters the space between the outer cylinder 1 and the annular filter screen 14 through the annular filter screen 14, and finally is discharged from the first liquid outlet 6 on the outer cylinder 1.

[0026] In addition, a scraping mechanism is provided in the space between the annular filter 14 and the inner cylinder 10. The scraping mechanism is installed on the outer surface of the inner cylinder 10. The scraping mechanism includes a scraping component and a suction component. During the filtering process, impurities in the fuel oil will gather on the surface of the annular filter 14 close to the inner cylinder 10 under the action of the pressure difference. The scraping component is used to scrape off the accumulated dirt on the surface of the annular filter 14. During the filtering and scraping process, some of the accumulated dirt will be blocked in the mesh of the annular filter 14. These accumulated dirt can be sucked into the inner cylinder 10 through the suction component, thereby cleaning the annular filter 14 and extending the replacement cycle and service life of the annular filter 14.

[0027] In addition, in order to facilitate the discharge of accumulated dirt from the inner cylinder 10, a drainage mechanism is also provided. A conical accommodating chamber 31 is provided inside the lower end of the inner cylinder 10. The drainage mechanism is arranged in the conical accommodating chamber 31. The drainage mechanism includes a driving shaft 33 and a spiral extrusion blade 34. The driving shaft 33 is rotatably arranged in the inner cylinder 10. The spiral extrusion blade 34 is fixed to the surface of the driving shaft 33, and the outer side of the spiral extrusion blade 34 is in contact with the inner wall of the conical accommodating chamber 31. The driving shaft 33 is used to drive the spiral extrusion blade 34 to rotate. Since the specific gravity of fuel oil is 0.7 to 0.8, the accumulated dirt is solid, and the specific gravity of the accumulated dirt is much greater than that of the fuel oil. When the spiral extrusion blade 34 rotates, the accumulated dirt with a larger specific gravity adheres to the inner wall of the conical accommodating chamber 31 and is pushed by the spiral extrusion blade 34 to move toward the bottom end of the inner cylinder 10, and the fuel oil with a lighter specific gravity overflows upward as the radius of the conical accommodating chamber 31 decreases.

[0028] In addition, combined Fig. 9 In order to improve the sealing effect and the convenience of sewage discharge, a solenoid valve 40 is installed at the bottom end of the driving shaft 33. The solenoid valve 40 is connected to the conical accommodating chamber 31. When the solenoid valve 40 is closed, the sewage discharge mechanism is sealed. When the solenoid valve 40 is opened, the sewage discharge mechanism is connected to the external space. The working mode of the solenoid valve 40 can be timed opening, that is, the solenoid valve 40 is opened and then closed at intervals to facilitate the discharge of accumulated sewage. The working mode of the solenoid valve 40 can also be triggered opening, that is, a pressure sensor is installed at the connecting end of the solenoid valve 40 and the conical accommodating chamber 31. As the sewage at the bottom end of the inner cylinder 10 accumulates, the bottom pressure gradually increases. After reaching the set value, the solenoid valve 40 is controlled to open and then close.

[0029] Furthermore, a driving mechanism 29 is also provided at the lower end of the first lower sealing plate 3. The driving mechanism 29 is used to drive the inner cylinder 10 and the driving shaft 33 to rotate, and at the same time make the inner cylinder 10 and the driving shaft 33 reciprocate in the vertical direction. The vertical movement of the inner cylinder 10 and the driving shaft 33 is synchronous. The reason why the inner cylinder 10 reciprocates in the vertical direction is to increase the range of action of the suction component, thereby improving the cleaning effect of the scraping mechanism. In addition, the angular velocity of the driving shaft 33 during rotation is greater than the angular velocity of the inner cylinder 10, so that there is an angular velocity difference between the driving shaft 33 and the inner cylinder 10 during rotation, so as to avoid the situation where the stirring effect of the spiral extrusion blade 34 on the fuel oil is reduced when the angular velocities of the driving shaft 33 and the inner cylinder 10 are the same.

[0030] Combination Figure 2 - Figure 4The scraping assembly includes a first spiral blade 12, which is fixedly arranged on the outer peripheral surface of the inner cylinder 10. A first spiral scraper 11 is fixedly arranged on the side of the first spiral blade 12 close to the annular filter 14. One side of the first spiral scraper 11 contacts the surface of the annular filter 14. The contact surface between the first spiral scraper 11 and the annular filter 14 is a brush. When the inner cylinder 10 rotates, the first spiral blade 12 can push the fuel oil to the lower end of the outer cylinder 1, thereby increasing the filtering speed of the fuel oil. On the other hand, it can also accelerate the scraped dirt to settle to the bottom of the inner cylinder 10.

[0031] Combination Figure 3 and Figure 5 The above-mentioned suction component includes a suction tube 13, which is fixed on the inner tube 10 and communicated with the interior of the inner tube 10. A through hole is opened on the first spiral scraper 11, and one end of the suction tube 13 away from the inner tube 10 is accommodated in the through hole. Preferably, the end of the suction tube 13 away from the inner tube 10 is 5mm to 10mm away from the inner surface of the annular filter 14.

[0032] In addition, a check valve is provided in the suction pipe 13 to prevent the liquid from flowing back from the inner cylinder 10 to the outside of the inner cylinder 10 , thereby preventing the sucked dirt from returning to the space between the inner cylinder 10 and the annular filter 14 again.

[0033] Combination Figure 4 and Figure 6 In order to facilitate the re-filtration of the fuel oil in the inner cylinder 10, a filter element 20 is provided in the inner cylinder 10, and the filter element 20 is fixedly installed on the upper cover plate 2. Specifically, a constraint cylinder 8 can be fixedly installed on the upper cover plate 2, and an upper fixed plate 9 is fixedly installed on the top of the constraint cylinder 8. The filter element 20 can be fixedly installed on the upper fixed plate 9 through a fixing rod 22.

[0034] In addition, a liquid outlet pipe 16 is provided at the top end of the filter element 20, and the liquid outlet pipe 16 is used to lead out the fuel oil filtered by the filter element 20. A suction pump 4 is also installed on the upper cover plate 2, and the liquid inlet end of the suction pump 4 is connected to one end of the liquid outlet pipe 16, so that the fuel oil in the inner tube 10 is extracted by the suction pump 4, and the fuel oil at the liquid outlet end of the suction pump 4 can be transported together with the fuel oil discharged from the first liquid outlet 6.

[0035] Furthermore, in order to maintain a sufficient pressure difference between the inside and outside of the inner cylinder 10, a sealing ring 201 is fixedly provided on the outer peripheral surface of the top end of the filter element 20, and the sealing ring 201 contacts the inner wall of the inner cylinder 10, so that a sealed space is formed inside the inner cylinder 10. When the fuel oil inside the inner cylinder 10 decreases, the pressure will also decrease, thereby forcing the fuel oil outside the inner cylinder 10 to enter the inner cylinder 10 through the suction tube 13.

[0036] In addition, in order to scrape dirt from the filter element 20, a second spiral blade 21 is fixedly provided on the inner surface of the inner cylinder 10, and a second spiral scraper 211 is fixedly provided on the side of the second spiral blade 21 close to the filter element 20. One side of the second spiral scraper 211 contacts the surface of the filter element 20. The second spiral scraper 211 is made of the same material as the first spiral scraper 11. When the inner cylinder 10 rotates, the second spiral blade 21 can push the liquid to the bottom of the inner cylinder 10, thereby accelerating the scraped dirt to settle to the bottom of the inner cylinder 10.

[0037] Combination Figure 5 and Figure 6 In order to facilitate cleaning of the accumulated dirt between the inner cylinder 10 and the annular filter screen 14 near the bottom end of the inner cylinder 10, an isolation ring 18 is fixedly provided on the upper surface of the first lower sealing plate 3. The isolation ring 18 is located between the inner cylinder 10 and the annular filter screen 14. A pressure cover 181 is fixedly provided on the top of the isolation ring 18. The bottom end of the inner cylinder 10 extends downward after passing through the pressure cover 181 and the first lower sealing plate 3. The inner cylinder 10, the pressure cover 181, the isolation ring 18 and the first lower sealing plate 3 enclose a sealed space.

[0038] In addition, a sealing ring 23 is fixedly provided on the outer surface of the inner cylinder 10, and the sealing ring 23 is located between the inner cylinder 10 and the isolation ring 18, and one end of the sealing ring 23 is in contact with the inner surface of the isolation ring 18, a first one-way valve 19 is installed on the isolation ring 18, and a second one-way valve 24 is installed on the inner cylinder 10, and the heights of the first one-way valve 19 and the second one-way valve 24 are both lower than the height of the sealing ring 23.

[0039] When the sealing ring 23 moves upward, the first one-way valve 19 opens and the second one-way valve 24 closes, allowing the fuel oil to enter the isolation ring 18. When the sealing ring 23 moves downward, the first one-way valve 19 closes and the second one-way valve 24 opens, allowing the fuel oil in the isolation ring 18 to enter the inner tube 10. Through the reciprocating motion of the sealing ring 23, the fuel oil mixed with dirt between the inner tube 10 and the annular filter 14 near the bottom of the inner tube 10 is continuously sent into the inner tube 10 for discharge through the sewage discharge mechanism.

[0040] In this embodiment, a bottom cover 32 is fixedly provided at the bottom end of the inner cylinder 10, so that the inner cylinder 10 is a sealed space, and the inner cylinder 10 is rotatably connected to the pressure cover 181 and the first lower cover plate 3. A shaft sleeve 25 can be set between the first lower cover plate 3 and the inner cylinder 10 to facilitate the connection between the two. Correspondingly, sealing treatment is required at the rotating connection.

[0041] Combination Figure 6In order to improve the sewage discharge effect of the sewage discharge mechanism, it is preferred that the diameter of the top side of the conical accommodating chamber 31 is larger than the diameter of the bottom side, so that the conical accommodating chamber 31 forms a funnel-shaped structure, thereby gradually increasing the extrusion force applied to the accumulated sewage in the process of moving toward the bottom end of the conical accommodating chamber 31.

[0042] In addition, it is preferred that the radius of the top side of the spiral extrusion blade 34 is larger than the radius of the bottom side, so that the outer side of the spiral extrusion blade 34 is always in contact with the inner wall of the tapered accommodating chamber 31. It is preferred that the pitch of the top side of the spiral extrusion blade 34 is larger than the pitch of the bottom side, so that the pitch of the spiral extrusion blade 34 gradually decreases in the vertical downward direction. As the radius of the inner wall of the tapered accommodating chamber 31 decreases, the extrusion force on the accumulated dirt becomes greater and greater, thereby being compacted.

[0043] Furthermore, in order to facilitate the flow of fuel oil, an overflow hole is provided on one side of the spiral extrusion blade 34 close to the drive shaft 33. The overflow hole vertically penetrates the spiral extrusion blade 34, so that the fuel oil with a lighter specific gravity can flow back through the overflow hole.

[0044] Combination Figure 6 and Figure 7 In order to facilitate the discharge of accumulated dirt, the driving shaft 33 is rotatably connected to the bottom cover 32.

[0045] In addition, a sewage discharge chamber 331 is opened in the driving shaft 33, and the sewage discharge chamber 331 passes through the bottom end of the driving shaft 33. A sewage discharge hole 332 is opened on the outer surface of the bottom end of the driving shaft 33 close to the conical accommodating chamber 31. The sewage discharge hole 332 is connected with the sewage discharge chamber 331, so that the accumulated sewage pushed to the bottom of the conical accommodating chamber 31 by the spiral extrusion blades 34 can enter the sewage discharge chamber 331 through the sewage discharge hole 332 and be discharged through the sewage discharge chamber 331.

[0046] At this time, the solenoid valve 40 can be installed at the bottom end of the driving shaft 33 and communicate with the sewage chamber 331 .

[0047] Combination Figure 6 In order to support the inner tube 10 , a bracket 7 is provided at the bottom end of the first lower sealing plate 3 , and the first lower sealing plate 3 is fixed on the bracket 7 , so that the outer shell assembly is supported by the bracket 7 .

[0048] In addition, a first driving wheel 26 is provided on the outer circumferential surface of the inner cylinder 10, and the first driving wheel 26 is provided on the side of the first lower sealing plate 3 close to the bracket 7. The first driving wheel 26 is rotatably installed on the bracket 7, and the first driving wheel 26 is axially fixed, that is, the first driving wheel 26 can rotate but cannot move. A first flat key 30 is fixed on the outer circumferential surface of the inner cylinder 10, and a first sliding groove 261 is opened on the inner circumferential surface of the first driving wheel 26. The first flat key 30 can slide in the first sliding groove 261, and the first driving wheel 26 is used to drive the inner cylinder 10 to rotate.

[0049] In this embodiment, when the first driving wheel 26 drives the inner cylinder 10 to rotate, the inner cylinder 10 can still move in the vertical direction, and the upper end of the inner cylinder 10 can be inserted into the constraining cylinder 8 and is rotatably connected to the constraining cylinder 8.

[0050] Combination Figure 6 , Figure 8 and Fig. 9 In order to facilitate the rotation of the driving shaft 33 and to support the bottom end of the driving shaft 33, a support sleeve 38 is provided on the lower support plate 71 below the bracket 7. A sleeve shaft 35 is sleeved on the outer circumference of the driving shaft 33. The bottom end of the sleeve shaft 35 is rotatably installed in the support sleeve 38. In addition, a second driving wheel 36 is fixedly provided on the outer circumference of the sleeve shaft 35. The second driving wheel 36 is used to drive the sleeve shaft 35 to rotate. In addition, a second flat key 333 is fixedly provided on the outer circumference of the driving shaft 33. A second sliding groove 351 is provided on the inner circumference of the sleeve shaft 35. The second flat key 333 can slide in the second sliding groove 351, so that the sleeve shaft 35 can drive the driving shaft 33 to rotate while the driving shaft 33 can still move in the vertical direction with the inner cylinder 10.

[0051] In addition, an inclined end surface 352 is provided at the bottom end of the second flat key 333 and the second slide groove 351, so that when the drive shaft 33 moves downward, the residual dirt at the bottom of the second slide groove 351 can be pushed out to avoid the dirt remaining at the bottom of the second slide groove 351.

[0052] Combination Figure 5 and Fig.10 In order to facilitate the reciprocating motion of the inner cylinder 10 in the vertical direction, a supporting slide column 37 is fixedly provided at the bottom end of the bottom cover 32, and a swash plate 28 is fixedly provided on the lower support plate 71. The angle between the swash plate 28 and the horizontal plane is 10° to 30°, and the axis center of the swash plate 28 is a hollow structure to facilitate the installation of the drive shaft 33 and the sleeve shaft 35.

[0053] Furthermore, the bottom end of the support slide 37 abuts against the surface of the swash plate 28, so that when the inner cylinder 10 rotates, the height of the inner cylinder 10 changes with the change of the contact point between the support slide 37 and the swash plate 28, thereby making the height of the inner cylinder 10 change periodically with its own rotation.

[0054] Combination Figure 5 and Fig.11 The driving mechanism 29 mentioned above includes a motor 291 , and the motor 291 is installed on the bracket 7 .

[0055] In addition, it also includes a first rotating shaft 292, which is fixedly connected to the axis of the output end of the motor 291, and a driving wheel 294 is fixedly provided on the outer circumference of the first rotating shaft 292. A second rotating shaft 293 is also provided on one side of the first rotating shaft 292. Both ends of the second rotating shaft 293 are rotatably installed on the bracket 7. The outer circumference of the second rotating shaft 293 is fixedly provided with a second driven wheel 296, a first driven wheel 295 and a third driven wheel 297 in sequence from top to bottom.

[0056] Furthermore, the driving wheel 294 and the first driven wheel 295 are connected by a first belt 298; thereby, the second rotating shaft 293 is driven to rotate by the driving wheel 294, and the second driven wheel 296 and the first driving wheel 26 are connected by a second belt 299, thereby driving the inner cylinder 10 to rotate. Preferably, the radius of the second driven wheel 296 is smaller than the radius of the first driving wheel 26, so that the torque acting on the first driving wheel 26 is increased, and the third driven wheel 297 and the second driving wheel 36 are connected by a third belt 2910, thereby driving the sleeve shaft 35 to rotate. Preferably, the radius of the third driven wheel 297 is larger than the radius of the second driving wheel 36, so that the angular velocity of the second driving wheel 36 is increased. The radius of the second driven wheel 296 is smaller than the radius of the third driven wheel 297, so that there is an angular velocity difference between the inner cylinder 10 and the driving shaft 33 when they rotate.

[0057] When in use (working), unfiltered fuel oil enters the space between the annular filter 14 and the inner cylinder 10 from the liquid inlet 5, and part of the fuel oil is filtered by the annular filter 14 and enters the space between the outer cylinder 1 and the annular filter 14, and is finally discharged from the first liquid outlet 6 on the outer cylinder 1.

[0058] When the motor 291 rotates, it drives the inner cylinder 10 to rotate. At this time, the first spiral scraper 11 scrapes off the dirt on the annular filter 14, and the first spiral blade 12 drives the fuel oil and dirt outside the inner cylinder 10 to settle to the bottom end of the inner cylinder 10. The second spiral scraper 211 scrapes off the dirt on the filter element 20, and the second spiral blade 21 drives the fuel oil and dirt inside the inner cylinder 10 to settle to the bottom end of the inner cylinder 10. At the same time, the suction pump 4 is started, forcing the fuel oil outside the inner cylinder 10 to enter the inner cylinder 10 through the suction tube 13, and the fuel oil inside the inner cylinder 10 is filtered through the filter element 20 and discharged through the liquid outlet pipe 16.

[0059] When the motor 291 rotates, it also drives the driving shaft 33 to rotate, so that the accumulated dirt in the conical accommodating chamber 31 is squeezed into the sewage discharge chamber 331 through the spiral squeezing blades 34 and discharged.

[0060] The inner cylinder 10 simultaneously performs vertical reciprocating motion when rotating, and moves with the sealing ring 23 , so that the fuel oil mixed with dirt between the inner cylinder 10 and the annular filter 14 near the bottom of the inner cylinder 10 is continuously sent into the inner cylinder 10 through the reciprocating motion of the sealing ring 23 .

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0062] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fine filter for refined fuel oil, characterized in that: include: A shell assembly, the shell assembly comprising an outer cylinder (1), an upper cover plate (2) and a first lower sealing plate (3), the upper cover plate (2) being fixedly connected to the top end of the outer cylinder (1), and the first lower sealing plate (3) being fixedly connected to the bottom end of the outer cylinder (1); An inner cylinder (10), the inner cylinder (10) being rotatably mounted at the axis center of the outer shell assembly, and the axis of the inner cylinder (10) being parallel to the axis of the outer cylinder (1); an annular filter screen (14), the annular filter screen (14) being vertically mounted in the housing assembly, and the annular filter screen (14) being located between the inner cylinder (10) and the outer cylinder (1); a scraping mechanism, the scraping mechanism being mounted on the outer surface of the inner cylinder (10), the scraping mechanism comprising a scraping component and a suction component, the scraping component being used to scrape off dirt accumulated on the surface of the annular filter (14), and the suction component being used to suck dirt accumulated in the mesh of the annular filter (14) into the interior of the inner cylinder (10); A sewage discharge mechanism, wherein a conical accommodating chamber (31) is provided inside the lower end of the inner cylinder (10), and the sewage discharge mechanism is arranged in the conical accommodating chamber (31). The sewage discharge mechanism comprises a driving shaft (33) and a spiral extrusion blade (34), wherein the driving shaft (33) is rotatably arranged in the inner cylinder (10), and the spiral extrusion blade (34) is fixedly arranged on the surface of the driving shaft (33), and the outer side of the spiral extrusion blade (34) is in contact with the inner wall of the conical accommodating chamber (31), and the driving shaft (33) is used to drive the spiral extrusion blade (34) to rotate, so that the spiral extrusion blade (34) squeezes the accumulated sewage toward the bottom end of the inner cylinder (10); A solenoid valve (40), the solenoid valve (40) being mounted at the bottom end of the drive shaft (33), the solenoid valve (40) being in communication with the conical accommodating chamber (31), the sewage discharge mechanism being sealed when the solenoid valve (40) is closed, and the sewage discharge mechanism being in communication with the external space when the solenoid valve (40) is opened; A driving mechanism (29), the driving mechanism (29) being arranged at the lower end of the first lower sealing plate (3), the driving mechanism (29) being used to drive the inner cylinder (10) and the driving shaft (33) to rotate, and at the same time causing the inner cylinder (10) and the driving shaft (33) to perform reciprocating motion in a vertical direction, and the angular velocity of the driving shaft (33) during rotation is greater than the angular velocity of the inner cylinder (10).

2. A fine filter for refined fuel oil according to claim 1, characterized in that: The scraping assembly comprises: a first spiral blade (12), the first spiral blade (12) being fixedly mounted on the outer peripheral surface of the inner cylinder (10), a first spiral scraper (11) being fixedly mounted on a side of the first spiral blade (12) close to the annular filter screen (14), and a side of the first spiral scraper (11) being in contact with a surface of the annular filter screen (14); When the inner cylinder (10) rotates, the first spiral blade (12) can push the liquid toward the lower end of the outer cylinder (1); The suction assembly comprises: a suction tube (13), the suction tube (13) being fixedly mounted on the inner tube (10) and being in communication with the interior of the inner tube (10); a through hole being formed on the first spiral scraper (11); and an end of the suction tube (13) away from the inner tube (10) being received in the through hole; A check valve is provided in the suction tube (13), and the check valve is used to prevent liquid from flowing back from the inner cylinder (10) to the outside of the inner cylinder (10).

3. A fine filter for refined fuel oil according to claim 2, characterized in that: A filter element (20) is provided in the inner cylinder (10), and the filter element (20) is fixedly mounted on the upper cover plate (2); a liquid outlet pipe (16), the liquid outlet pipe (16) being mounted on a top end of the filter element (20); A suction pump (4), the suction pump (4) being mounted on the upper cover plate (2), the liquid inlet end of the suction pump (4) being connected to one end of the liquid outlet pipe (16); A sealing ring (201), the sealing ring (201) being fixedly mounted on the outer peripheral surface of the top end of the filter element (20), and the sealing ring (201) being in contact with the inner wall of the inner cylinder (10); a second spiral blade (21), the second spiral blade (21) being fixedly mounted on the inner surface of the inner cylinder (10), a second spiral scraper (211) being fixedly mounted on a side of the second spiral blade (21) close to the filter element (20), and a side of the second spiral scraper (211) being in contact with a surface of the filter element (20); When the inner cylinder (10) rotates, the second spiral blade (21) can push the liquid toward the bottom end of the inner cylinder (10).

4. A fine filter for refined fuel oil according to claim 3, characterized in that: An isolation ring (18) is fixedly provided on the upper surface of the first lower sealing plate (3), and the isolation ring (18) is located between the inner cylinder (10) and the annular filter screen (14); A gland (181) is fixedly provided at the top end of the isolation ring (18), the bottom end of the inner cylinder (10) passes through the gland (181) and the first lower sealing plate (3) and then extends downward, and a bottom sealing cover (32) is fixedly provided at the bottom end of the inner cylinder (10), and the inner cylinder (10) is rotatably connected to the gland (181) and the first lower sealing plate (3); A sealing ring (23) is fixedly provided on the outer surface of the inner cylinder (10), the sealing ring (23) is located between the inner cylinder (10) and the isolation ring (18), and one end of the sealing ring (23) is in contact with the inner surface of the isolation ring (18); A first one-way valve (19) is installed on the isolation ring (18), and a second one-way valve (24) is installed on the inner cylinder (10), wherein the heights of the first one-way valve (19) and the second one-way valve (24) are both lower than the height of the sealing ring (23); When the sealing ring (23) moves upward, the first one-way valve (19) opens and the second one-way valve (24) closes; when the sealing ring (23) moves downward, the first one-way valve (19) closes and the second one-way valve (24) opens.

5. A fine filter for refined fuel oil according to claim 4, characterized in that: The diameter of the top end side of the conical accommodating cavity (31) is greater than the diameter of the bottom end side; The radius of the top end side of the spiral extrusion blade (34) is greater than the radius of the bottom end side; The pitch of the spiral extrusion blade (34) on the top side is greater than the pitch on the bottom side; An overflow hole is provided on one side of the spiral extrusion blade (34) close to the drive shaft (33), and the overflow hole vertically penetrates the spiral extrusion blade (34).

6. A fine filter for refined fuel oil according to claim 5, characterized in that: The driving shaft (33) is rotatably connected to the bottom cover (32); A sewage discharge cavity (331) is provided in the driving shaft (33), and the sewage discharge cavity (331) passes through the bottom end of the driving shaft (33); A drainage hole (332) is provided on the outer surface of the bottom end of the driving shaft (33) close to the conical accommodating cavity (31), and the drainage hole (332) is communicated with the drainage cavity (331); The solenoid valve (40) is in communication with the sewage discharge chamber (331).

7. A fine filter for refined fuel oil according to claim 6, characterized in that: A bracket (7) is provided at the bottom end of the first lower sealing plate (3), and the first lower sealing plate (3) is fixed on the bracket (7); A first driving wheel (26) is provided on the outer circumferential surface of the inner cylinder (10), and the first driving wheel (26) is arranged on a side of the first lower sealing plate (3) close to the bracket (7); The first driving wheel (26) is rotatably mounted on the bracket (7), and the first driving wheel (26) is axially fixed; A first flat key (30) is fixedly disposed on the outer circumferential surface of the inner cylinder (10), a first sliding groove (261) is formed on the inner circumferential surface of the first driving wheel (26), and the first flat key (30) is capable of sliding in the first sliding groove (261); The first driving wheel (26) is used to drive the inner cylinder (10) to rotate.

8. A fine filter for refined fuel oil according to claim 7, characterized in that: A support sleeve (38) is provided on the lower support plate (71) below the bracket (7); a sleeve shaft (35) is sleeved on the outer circumference of the drive shaft (33); and the bottom end of the sleeve shaft (35) is rotatably mounted in the support sleeve (38); A second driving wheel (36) is fixedly provided on the outer peripheral surface of the sleeve shaft (35), and the second driving wheel (36) is used to drive the sleeve shaft (35) to rotate; A second flat key (333) is fixedly provided on the outer circumferential surface of the drive shaft (33), a second sliding groove (351) is provided on the inner circumferential surface of the sleeve shaft (35), and the second flat key (333) can slide in the second sliding groove (351); The bottom ends of the second flat key (333) and the second slide groove (351) are both provided with inclined end surfaces (352).

9. A fine filter for refined fuel oil according to claim 8, characterized in that: A supporting slide column (37) is fixedly provided at the bottom end of the bottom cover (32); A swash plate (28) is fixedly provided on the lower support plate (71), and the angle between the swash plate (28) and the horizontal plane is 10° to 30°; The bottom end of the support slide column (37) abuts against the surface of the swash plate (28), so that when the inner cylinder (10) rotates, the height of the inner cylinder (10) changes with the change of the contact point between the support slide column (37) and the swash plate (28).

10. A fine filter for refined fuel oil according to claim 9, characterized in that: The driving mechanism (29) comprises: A motor (291), wherein the motor (291) is mounted on a bracket (7); A first rotating shaft (292), the first rotating shaft (292) being fixedly connected to the axis of the output end of the motor (291), and a driving wheel (294) being fixedly disposed on the outer circumference of the first rotating shaft (292); A second rotating shaft (293), both ends of the second rotating shaft (293) being rotatably mounted on the bracket (7), and a second driven wheel (296), a first driven wheel (295) and a third driven wheel (297) being fixedly mounted on the outer circumference of the second rotating shaft (293) in order from top to bottom; The driving wheel (294) and the first driven wheel (295) are connected via a first belt (298); The second driven wheel (296) and the first driving wheel (26) are connected via a second belt (299), and the radius of the second driven wheel (296) is smaller than the radius of the first driving wheel (26); The third driven wheel (297) and the second driving wheel (36) are connected via a third belt (2910), and the radius of the third driven wheel (297) is greater than the radius of the second driving wheel (36); The radius of the second driven wheel (296) is smaller than the radius of the third driven wheel (297).

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