Base oil filtering and separating device

Abstract

The invention relates to the technical field of oil filtering equipment, in particular to a base oil filtering and separating device which comprises a rack, an inner cavity is formed in the rack, a slag discharging opening and an oil filling opening are formed in the rack, and the oil filling opening is connected with an external positive pressure oil supply mechanism; a restraining cover and a flow slowing plate are arranged in the inner cavity and located above the oil injection port, and the flow slowing plate and the restraining cover form a guiding position flow slowing structure where oil flows along a curve path. A filter pressing frame is arranged above the flow slowing plate, a plurality of filter cartridges are arranged on the filter pressing frame, the outer side walls of the filter cartridges are wrapped with filter screens, and the inner spaces of the filter cartridges extend to the outer side of the rack through oil outlet pipes communicated with the tops. The invention provides a base oil filtering and separating device, which is beneficial for solving the problems that some existing filtering devices adopt an oil filtering path from top to bottom, impurities mixed in crude oil are easy to quickly precipitate to cause filter screen blockage, and the follow-up injected crude oil continuously overflows the impurities to accelerate the complete blockage of the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of oil filtering equipment, in particular to a base oil filtering and separating device. Background Art

[0002] Base oils are used to make products, including greases, motor oils and metalworking fluids. Different products require different oil compositions and properties. One of the most important factors is the viscosity of the liquid at different temperatures. Whether crude oil is suitable for making base oil depends on the concentration of base oil molecules and the difficulty of extracting these molecules. Base oil is produced by refining crude oil, which means that the crude oil is heated so that the various distillates can be separated from each other. Therefore, in the base oil production process, there are more impurities, and it is usually necessary to use a filtering device to assist in the filtration of the base oil, so as to ensure the purity of the base oil during the production process.

[0003] In the prior art, a patent document with publication number CN211611916U proposes a base oil automatic slag discharge device, which relates to the field of base oil technology and is intended to solve the problem that the existing slag discharge equipment has high cost and poor treatment effect. A filter screen is installed above the inside of the slag discharge filter box, and the filter screen includes a primary filter screen and a secondary filter screen, and the primary filter screen is located above the secondary filter screen. A filter sand fixing frame is installed below the filter screen, and filter sand is arranged inside the filter sand fixing frame. A base oil inlet pipe is installed on one side of the upper end of the slag discharge filter box, and a liquid outlet is arranged on one side of the slag discharge filter box. A second base oil collecting pipe is installed at one end of the liquid outlet, and the second base oil collecting pipe is embedded in the inside of the slag discharge filter box. A first base oil collecting pipe is installed at the other end of the liquid outlet, and a backwash water inlet pipe is arranged at the upper end of the first base oil collecting pipe, and a backwash water discharge pipe is installed in the middle of the lower end of the slag discharge filter box.

[0004] In the above technical solution, the crude oil is input from the top of the filter box from top to bottom and directly passes through the filter screen. In the process of filtering the base oil, the impurities in the crude oil are easily precipitated and accumulated in the area above the filter screen due to their own gravity, which makes the filter gap of the filter screen very easy to be covered and blocked by impurities, thereby affecting the subsequent oil penetration in the crude oil. In addition, the impurities located in the bottom area close to the filter screen will cause blockage of the filter screen. At the same time, the impurities located in the top area will be affected by the subsequent injection of crude oil. The surging will form impurities in the upper layer, increasing the fluidity of impurities in the oil, making the oil in each area more turbid, thereby accelerating the speed at which impurities block the positions of each area of ​​the filter screen. Therefore, there is an urgent need for a base oil filtration and separation device that can solve the above defects. Summary of the invention

[0005] The present invention provides a base oil filtering and separation device, which is conducive to solving the problem that some existing filtering devices adopt a top-down oil filtering path, which easily leads to filter screen clogging due to rapid precipitation of impurities contained in the crude oil, and the subsequent injection of crude oil continuously stirs up impurities and accelerates the overall clogging of the filter screen.

[0006] The present invention is achieved in that:

[0007] A base oil filtering and separating device comprises a frame of a cylindrical structure, an inner cavity is provided inside the frame, a slag discharge port which can be opened and closed and controlled is provided at the bottom of the inner cavity, an oil filling port is provided on the side wall of the frame above the slag discharge port, and the oil filling port is connected with an external positive pressure oil supply mechanism; a restraining cover of a cone structure which is narrow at the top and wide at the bottom is provided above the oil filling port, the radial outer end of the restraining cover is fitted and connected with the inner wall of the frame, and a perforation of a longitudinal through hole structure is provided at the center position of the top of the restraining cover; a slow flow plate is provided above the restraining cover in the inner cavity, and the slow flow plate and the restraining cover form a guiding slow flow structure for the oil to flow along a curved path; a filter press frame is provided above the slow flow plate, and a plurality of filter cartridges are provided on the filter press frame, and a filter screen is wrapped on the outer wall of the filter cartridge, and the internal space of the filter cartridge extends to the outside of the frame through an oil outlet pipe connected to the top; a flow guide is also provided below the restraining cover, and the flow guide is a cylindrical mechanism fitted with the inner wall of the frame, and a spiral blade adapted to the oil inlet direction of the oil filling port is provided on the inner wall of the flow guide, and a plurality of resistance increasing flanges are provided at the bottom of the spiral blade.

[0008] On the basis of the above technical solution, a cone bucket structure which is wide at the top and narrow at the bottom is provided at the bottom of the frame, a support is provided at the bottom of the outer end of the frame, and the slag discharge port is located at the bottom of the cone bucket structure.

[0009] On the basis of the above technical solution, the inner cavity is provided with a vortex finder at the bottom of the guide member, the vortex finder is connected to the inner wall of the frame through a bracket, and the vortex finder can generate vortex driving force upward.

[0010] Based on the above technical solution, the vortex finder is located in the area below the oil filling port.

[0011] On the basis of the above technical solution, the slow flow plate includes a first plate body and a second plate body distributed longitudinally at intervals. The first plate body is located below the second plate body. The first plate body is provided with a blocking portion in the radial center area opposite to the perforation. A number of slow flow holes are evenly arranged on the periphery of the blocking portion, and the slow flow holes penetrate the first plate body longitudinally. The second plate body is provided with a number of slow flow grooves, and the slow flow grooves penetrate the second plate body longitudinally.

[0012] On the basis of the above technical solution, the filter press frame includes two longitudinally spaced mounting plates, the filter cartridge is vertically arranged between the mounting plates, the side of the filter cartridge is evenly distributed with hollow holes, and the outer wall of the filter cartridge is centrally symmetrically arranged with a plurality of ribs around its axial center line, and the filter screen is arranged against the outer end of the ribs.

[0013] Based on the above technical solution, the filter screen between adjacent ribs has a curved structure.

[0014] On the basis of the above technical solution, a diverter hood is arranged at intervals at the outer end of the filter cartridge. The diverter hood is arranged vertically. The axial ends of the diverter hood are connected to the mounting plate of the filter press frame. A plurality of diverter holes are arranged on the side wall of the diverter hood. The diverter holes radially penetrate the side wall of the diverter hood.

[0015] Based on the above technical solution, an elastic pad is installed between the diverter hood and the filter screen. Several elastic pads are arranged symmetrically around the axial center line of the diverter hood. The axial ends of the diverter hood are movably connected to the mounting frame. The elastic pads constitute an elastic support structure in the radial direction of the diverter hood.

[0016] On the basis of the above technical solution, a longitudinal elastic supporting structure is provided between the slow flow plate and the inner side wall of the frame.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] 1. The present invention realizes the flow of oil along a complex curved path by arranging a layout with the oil filling port at the bottom and the oil outlet pipe at the top, and utilizes the combined design of a restraining cover, a slow flow plate and a guide piece, thereby effectively slowing down the oil flow speed, so that impurities contained in the oil can quickly form sediments at the bottom of the inner cavity, reducing the amount of impurities rising, thereby reducing the direct impact and rapid accumulation of impurities on the filter screen. This is conducive to solving the problem that some existing filtering devices adopt a top-down oil filtering path, which easily leads to the blockage of the filter screen due to the rapid precipitation of impurities contained in the crude oil, and the subsequent injection of crude oil continuously surges the impurities and accelerates the overall blockage of the filter screen.

[0019] 2. A flow guide is arranged under the restraint cover so that the crude oil entering the inner cavity through the oil filling port can be guided by the flow in the first place, and with the positive pressure condition provided by the outside, the setting of the spiral blades enables the whole oil to flow in a spiral ascending path, which plays a flow convergence and directional effect, and avoids the confusion of the positions of the oil entering the inner cavity from the front and back. In addition, the design of the resistance-increasing flange makes the oil receive a certain degree of resistance during the flow process. The resistance can control the flow rate and make the impurities mixed in the oil be initially intercepted, and a clustering effect is generated after multiple superposition in quantity, which is conducive to the rapid precipitation of impurities by their own weight after the impurities accumulate to a certain amount, further promoting the separation and sedimentation of impurities in the oil and improving the filtration efficiency.

[0020] 3. The optimized design of the filter cartridge and diversion hood increases the filtration area, improves the filtration efficiency, and reduces the risk of local overload of the filter.

[0021] 4. The longitudinal elastic support structure ensures that the slow flow plate can form an autonomous tensioning structure during long-term use, providing a certain degree of help for flow rate control, making the flow of oil more stable and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of a base oil filtering and separation device in one embodiment;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the middle slow flow plate;

[0025] Figure 3 A schematic diagram of a partial structure of a spiral blade in one embodiment;

[0026] Figure 4 This is a schematic diagram of the structure of a filter cartridge in one embodiment;

[0027] Figure 5 for Figure 4 Schematic diagram of the structure of the middle splitter hood;

[0028] Figure 6 for Figure 4 A cross-sectional view of

[0030] Figure 7 is a cross-sectional view of a filter cartridge in another embodiment;

[0031] Figure 8 for Figure 7 Schematic diagram of the compression state of the middle elastic pad;

[0032] Fig. 9 is a cross-sectional view of an elastic pad in another embodiment;

[0033] Fig.10 is a cross-sectional view of an elastic pad in yet another embodiment;

[0034] Fig.11 Schematic diagram of the longitudinal elastic support structure of the slow flow plate in one embodiment.

[0035] The following are marked in the figure: 1, frame; 11, inner cavity; 12, oil filling port; 13, slag discharge port; 14, support; 15, pressure relief valve; 2, restraint cover; 21, perforation; 22, guide cone; 3, guide piece; 31, spiral blade; 32, convex column; 4, slow flow plate; 41, first plate body; 411, baffle; 412, slow flow hole; 42, second plate body; 421, slow flow groove; 43, limit Position rod; 44, spring; 5, filter press frame; 51, oil outlet pipe; 6, filter cartridge; 61, cylinder; 611, rib; 62, filter screen; 63, oil outlet; 64, diverter cover; 641, diverter hole; 65, elastic pad; 651, inner plate; 652, outer plate; 653, support beam; 654, buffer cavity; 655, auxiliary beam; 656, pleated beam; 657, cavity; 7, vortex flow device DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0037] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to an element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1: Figure 1As shown, this embodiment discloses a base oil filtering and separation device, including a frame 1 of a cylindrical structure, an inner cavity 11 is provided inside the frame 1, and the inner cavity 11 serves as the main space for oil filtering. A cone bucket structure that is wide at the top and narrow at the bottom is provided at the bottom of the frame 1, and a support 14 is provided at the bottom of the outer end of the frame 1. Multiple supports 14 support the frame 1, and a slag discharge port 13 is located at the bottom of the cone bucket structure. The support 14 also elevates the position of the slag discharge port 13 to facilitate external piping and slag discharge operations. A pressure relief valve 15 is provided at the top of the frame 1 to prevent the internal pressure from being out of control due to overpressure.

[0041] An oil filling port 12 is provided on the side wall of the frame 1 above the slag discharge port 13. The oil filling port 12 is connected to an external positive pressure oil supply mechanism, which is a prior art. Its specific structure and working principle are not described here in detail. Those skilled in the art can select and implement it from the prior art according to the actual operation conditions. It should be noted that the oil inlet direction of the oil filling port 12 in this embodiment is inclined, so that the crude oil can flow along the inner wall of the frame 1 in the threshold direction after entering the inner cavity 11 through the oil filling port 12, so as to cooperate with the structure of the guide member 3.

[0042] The inner cavity 11 is located above the oil filling port 12 and is provided with a restraining cover 2 with a conical structure that is narrow at the top and wide at the bottom, similar to a bamboo hat structure, wherein the radial outer end of the restraining cover 2 is fit-connected with the inner wall of the frame 1, so that the oil below cannot penetrate from the periphery and bypass the restraining cover 2. A through hole 21 with a longitudinal through hole structure is provided at the center position of the top of the restraining cover 2. The function of the through hole 21 is to allow the oil below to converge and then flow upward to the upper area, that is, to have a directional effect on the flow path of the oil. The lower section of the restraining cover 2 is a guiding cone 22 to make the flow of the oil smoother and more stable.

[0043] The inner cavity 11 is located above the restraint cover 2 and is provided with a slow flow plate 4. The slow flow plate 4 and the restraint cover 2 form a guiding slow flow structure for the oil to flow along a curved path, which effectively controls the flow rate and helps to intercept more impurities through the tortuous path.

[0044] Specifically, in this embodiment, combined with Figure 2As shown, the slow flow plate 4 includes a first plate body 41 and a second plate body 42 that are longitudinally spaced apart. The first plate body 41 is located below the second plate body 42. The first plate body 41 is provided with a blocking portion 411 in the radial center area opposite to the through hole 21. A plurality of slow flow holes 412 are evenly arranged on the periphery of the blocking portion 411. The slow flow holes 412 are circular through hole structures, and the slow flow holes 412 longitudinally penetrate the first plate body 41. The second plate body 42 is provided with a plurality of slow flow grooves 421, and the slow flow grooves 421 are arc-shaped groove hole structures, and the slow flow grooves 421 longitudinally penetrate the second plate body 42. It should be noted that the slow-flow groove 421 and the slow-flow hole 412 are staggered, and the slow-flow plate 4 utilizes a double-layer plate structure and an ingenious through-hole structure design. Due to the existence of the baffle 411, the oil passing through the perforation 21 of the constraint cover 2 cannot directly go up vertically, and needs to turn horizontally to the outer area and pass through the diversion of the slow-flow hole 412, which not only reduces the flow rate but also makes the distribution of fine impurities in the oil more even. In this process, some impurities will precipitate due to their own weight and be intercepted in the top area of ​​the constraint cover 2, so that the impurity content of the subsequent upward oil is further reduced.

[0045] A filter press frame 5 is provided above the slow flow plate 4, and a plurality of filter cartridges 6 are provided on the filter press frame 5. A filter screen 62 is wrapped on the outer wall of the filter cartridge 6, and an oil outlet 63 is provided on the top of the filter cartridge 6. The inner space of the filter cartridge 6 is connected to the oil outlet pipe 51 at the top through the oil outlet 63, and extends to the outside of the frame 1, so as to facilitate the discharge of the filtered oil. The function of the filter press frame 5 is to fix the filter cartridge 6, and the function of the filter cartridge 6 is to finely filter impurities in the oil. The pure oil after filtration enters the filter cartridge 6 and is discharged along the oil outlet pipe 51.

[0046] Specific, combined Figure 4 The filter press frame 5 includes two mounting plates spaced longitudinally, and the filter cartridge 6 is vertically arranged between the mounting plates. The sides of the filter cartridge 6 are evenly distributed with hollow holes, and the hollow holes are used for the filtered oil to enter the filter cartridge 6. The size and number of the hollow holes are designed according to actual processing requirements. The filter cartridge 6 is provided with a cylinder 61 inside, and a plurality of ribs 611 are centrally symmetrically arranged on the outer wall of the cylinder 61 around its axial center line. Figure 6 As shown, the ribs 611 and the cylinder 61 are an integrated structure. The function of the ribs 611 is to radially extend the radial outer contour of the cylinder 61 and to empty the side space of the cylinder 61. The filter screen 62 is arranged against the outer end of the ribs 611 as the main structure for fine filtration.

[0047] It should be noted that the filter screen 62 between adjacent ribs 611 is in a curved structure, which increases the surface area of ​​the filter screen 62 and, in conjunction with the overhead effect of the ribs 611 , greatly improves the filtering efficiency.

[0048] Further, combined with Figure 4 and Figure 6The outer end of the cylinder 61 is provided with a diverter cover 64 at intervals. The diverter cover 64 is vertically arranged. The axial ends of the diverter cover 64 are connected to the mounting plate of the filter press frame 5. A plurality of diverter holes 641 are provided on the side wall of the diverter cover 64. The diverter holes 641 have a strip-shaped slot structure. The diverter holes 641 radially penetrate the side wall of the diverter cover 64. The function of the diverter cover 64 is to construct a flow limiting and guiding structure for the periphery of each cylinder 61, so that the oil on the periphery of the filter cartridge 6 can contact each area of ​​the filter screen 62 more evenly and comprehensively, reducing the occurrence of local working overload, which is conducive to ensuring the filtration quality and improving the filtration efficiency.

[0049] In this embodiment, in order to achieve a relatively ideal coarse filtering effect for the crude oil entering the inner cavity 11 at the first time, the Figure 1 and Figure 3 As shown, a guide member 3 is further provided under the restraint cover 2. The guide member 3 is a cylindrical mechanism arranged to fit the inner wall of the frame 1. A spiral blade 31 adapted to the oil inlet direction of the oil filling port 12 is provided on the inner wall of the guide member 3. After entering the oil filling port 12, the oil will flow along the inner wall of the guide member 3. Due to the presence of the spiral blade 31, the oil is guided when flowing, generating an upward spiral flow path. A plurality of resistance-increasing flanges are provided at the bottom of the spiral blade 31. The resistance-increasing flanges are specifically a plurality of convex columns 32. The function of the convex columns 32 is to increase the contact area between the spiral blade 31 and the oil and increase the friction, so that impurities can be effectively intercepted, thereby facilitating the precipitation of impurities by gravity.

[0050] Furthermore, in order to compensate for the upward spiral driving force of the oil, the inner cavity 11 is provided with a vortex finder 7 at the bottom of the guide member 3. The vortex finder 7 is connected to the inner wall of the frame 1 through a bracket. The vortex finder 7 can generate an eddy driving force upward, so that the oil can spiral upward more stably. Correspondingly, due to the increase in the eddy driving force and the pressure provided by the outside, the oil will actually be affected by centrifugal force during the upward process, resulting in more doped impurities gathered in the peripheral area, increasing the contact friction with the inner wall of the guide member 3, and then under the auxiliary influence of the boss 32, the effect of autonomous precipitation of impurities is improved, and a low-energy coarse filtration process is performed.

[0051] It should be noted that the vortex finder 7 is located in the area below the oil filling port 12, which can maintain the effective utilization rate of the vortex driving force and prevent part of the oil from directly escaping to the area below to cause a flow dead zone.

[0052] Example 2: Based on Example 1, Figure 7As shown, in this embodiment, an elastic pad 65 is disposed between the diverter cover 64 and the filter screen 62. The elastic pad 65 is a strip structure, and its long side direction is parallel to the axial direction of the diverter cover 64. A plurality of elastic pads 65 are centrally symmetrically arranged around the axial center line of the diverter cover 64. The two axial ends of the diverter cover 64 are movably connected to the mounting frame, and the elastic pad 65 constitutes an elastic support structure in the radial direction of the diverter cover 64. This makes the flow velocity of the oil in the outer area of ​​the diverter cover 64 too fast, and when the diverter cover 64 is subjected to local radial internal pressure, the elastic pad 65 can provide corresponding elastic support, that is, the elastic pad 65 in the pressure area absorbs part of the pressure and shrinks. After shrinkage, the gap space between the diverter cover 64 and the inner filter screen 62 in the area is compressed and reduced, resulting in an increase in the flow resistance in the area, which is then fed back to the oil outside the area, reducing the flow volume of the oil in the area. Therefore, the effect of autonomous flow control is achieved, so that the filter screens 62 in each area can work under a relatively balanced workload, thereby improving the filtration efficiency and ensuring the filtration quality.

[0053] Further, combined with Figure 8 As shown, the elastic pad 65 in this embodiment includes an inner sheet 651, an outer sheet 652 and a support beam 653 made of elastic material (rubber, silicone, etc., and its material is selected according to the characteristics of the oil actually processed). The cross-section formed by the inner sheet 651 and the outer sheet 652 is a "D"-shaped structure. The inner ends of the inner sheet 651 and the outer sheet 652 form two buffer chambers 654, so that the structure of the elastic pad 65 has more sensitive elasticity. The inner side of the inner sheet 651 abuts against the filter screen 62, and the outer side of the outer sheet 652 is connected and fixed to the inner wall of the diverter cover 64. The support beam 653 serves as the main elastic support. When receiving pressure, the support beam 653 will produce passive deformation to absorb part of the pressure.

[0054] Embodiment 3: Based on Embodiment 2, Fig. 9 As shown, in this embodiment, the inner sheet 651 of the elastic pad 65 is located on one side of the buffer cavity 654 and is also provided with a plurality of auxiliary beams 655. The radial height of the auxiliary beams 655 is lower than the height of the support beams 653. The function of the auxiliary beams 655 is that when the elastic pad 65 is subjected to a large degree of extrusion pressure and the outer sheet 652 and the support beams 653 shrink to a large extent, the auxiliary beams 655 can provide auxiliary support to prevent the elastic pad 65 from being excessively squeezed. This also enables the elastic support effect of the elastic band to be achieved in sections, and the buffering performance is richer.

[0055] Embodiment 4: Based on Embodiment 2, Fig.10As shown, in this embodiment, a pleated beam 656 is used between the inner sheet 651 and the outer sheet 652 to replace the support beam 653 in Example 2. The pleated beam 656 is a beam structure having a plurality of staggered sizes and interconnected in a linear manner. A cavity 657 is provided inside the pleated beam 656. The cavity 657 softens the structural rigidity of the pleated beam 656, so that it has sensitive multi-stage elastic characteristics on the basis of having a certain supporting effect. The specifications of the pleated beam 656 can be designed and processed according to the actual needs of elastic support.

[0056] Example 5: Based on Example 1, Fig.11 As shown, in this embodiment, in order to enrich the structure and function of the slow flow plate 4, a longitudinal elastic support structure is provided between the slow flow plate 4 and the inner side wall of the frame 1. The elastic support structure specifically includes a first plate body 41 and a second plate body 42 provided on the slow flow plate 4 (including a first plate body 41 and a second plate body 42, Fig.11 The limit rod 43 on the periphery of the frame 1 is uniformly marked with the slow flow plate 4 (summarized in the figure), and the bottom of the limit rod 43 is connected and fixed to the inner wall of the frame 1. The upper and lower ends of the limit rod 43 are located on the upper and lower sides of the slow flow plate 4 and constitute a limit structure. The slow flow plate 4 can move up and down relative to the limit rod 43. Furthermore, a spring 44 is arranged between the bottom of the slow flow plate 4 and the bottom end of the limit rod 43. The expansion and contraction direction of the spring 44 is arranged vertically. The top of the spring 44 is connected and fixed to the bottom of the slow flow plate 4, and the bottom end of the limit rod 43 at the bottom of the spring 44 is connected and fixed. In fact, the spring 44 has the effect of pulling the slow flow plate 4 down and resetting it. When the upward oil liquid produces an excessive upward push on the slow flow plate 4 due to excessive flow velocity, the spring 44 can pull down and support the slow flow plate 4, thereby having the effect of autonomously adjusting the resistance of the upward oil liquid, so that the flow velocity is stably and dynamically controlled, providing relatively stable conditions for subsequent filtration.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A base oil filtering and separating device, characterized in that: The machine frame (1) comprises a cylinder (61) structure, an inner cavity (11) is provided inside the machine frame (1), a slag discharge port (13) which can be opened and closed is provided at the bottom of the inner cavity (11), an oil injection port (12) is provided on the side wall of the machine frame (1) above the slag discharge port (13), and the oil injection port (12) is connected to an external positive pressure oil supply mechanism; a restraining cover (2) with a frustum structure having a narrow top and a wide bottom is provided above the inner cavity (11) and above the oil injection port (12), the radial outer end of the restraining cover (2) is fitted and connected to the inner wall of the machine frame (1), and the restraining cover (2) is provided to prevent the restraining cover (2) from being damaged. A perforation (21) with a longitudinal through-hole structure is provided at the center of the top of the cover (2); a slow-flow plate (4) is provided on the inner cavity (11) above the restraining cover (2); the slow-flow plate (4) and the restraining cover (2) form a guiding slow-flow structure for oil to flow along a curved path; a filter press frame (5) is provided above the slow-flow plate (4); a plurality of filter cartridges (6) are provided on the filter press frame (5); a filter screen (62) is wrapped on the outer wall of the filter cartridge (6); and the inner space of the filter cartridge (6) extends to the outside of the frame (1) through an oil outlet pipe (51) connected to the top; A flow guide (3) is also provided below the restraining cover (2). The flow guide (3) is a cylinder (61) mechanism arranged in contact with the inner wall of the frame (1). The inner wall of the flow guide (3) is provided with a spiral blade (31) adapted to the oil inlet direction of the oil filling port (12). A plurality of resistance-increasing flanges are provided at the bottom of the spiral blade (31).

2. The base oil filtering and separating device according to claim 1, characterized in that: A cone bucket structure that is wide at the top and narrow at the bottom is provided at the bottom of the frame (1), a support column (14) is provided at the bottom of the outer end of the frame (1), and the slag discharge port (13) is located at the bottom of the cone bucket structure.

3. The base oil filtering and separating device according to claim 1, characterized in that: The inner cavity (11) is provided with a vortex finder (7) at the bottom of the flow guide (3); the vortex finder (7) is connected to the inner side wall of the frame (1) via a bracket; the vortex finder (7) is capable of generating vortex driving force upwards.

4. The base oil filtering and separating device according to claim 3, characterized in that: The vortex finder (7) is located in the area below the oil filling port (12).

5. The base oil filtering and separating device according to claim 1, characterized in that: The slow flow plate (4) comprises a first plate body (41) and a second plate body (42) which are spaced apart in the longitudinal direction. The first plate body (41) is located below the second plate body (42). A baffle (411) is provided in the radial center area of ​​the first plate body (41) facing the through hole (21). A plurality of slow flow holes (412) are evenly arranged around the baffle (411). The slow flow holes (412) penetrate the first plate body (41) in the longitudinal direction. The second plate body (42) is provided with a plurality of slow flow grooves (421). The slow flow grooves (421) penetrate the second plate body (42) in the longitudinal direction.

6. The base oil filtering and separating device according to claim 1, characterized in that: The filter press frame (5) comprises two mounting plates spaced apart in the longitudinal direction, the filter cartridge (6) being vertically arranged between the mounting plates, the side of the filter cartridge (6) being evenly distributed with hollow holes, and a plurality of ribs (611) being centrally symmetrically arranged on the outer wall of the filter cartridge (6) around its axial center line, the filter screen (62) being arranged against the outer end of the ribs (611).

7. The base oil filtering and separating device according to claim 6, characterized in that: The filter screen (62) between adjacent ribs (611) has a curved structure.

8. The base oil filtering and separating device according to claim 6 or 7, characterized in that: A flow divider (64) is arranged at intervals on the outer end of the filter cartridge (6). The flow divider (64) is arranged vertically. The axial ends of the flow divider (64) are connected to the mounting plate of the filter press frame (5). A plurality of flow divider holes (641) are arranged on the side wall of the flow divider (64). The flow divider holes (641) radially penetrate the side wall of the flow divider (64).

9. The base oil filtering and separating device according to claim 8, characterized in that: An elastic pad (65) is disposed between the flow splitter cover (64) and the filter screen (62), and a plurality of elastic pads (65) are centrally symmetrically arranged around the axial center line of the flow splitter cover (64). Both axial ends of the flow splitter cover (64) are movably connected to the mounting frame, and the elastic pads (65) constitute an elastic supporting structure of the flow splitter cover (64) in the radial direction.

10. The base oil filtering and separating device according to claim 1, characterized in that: A longitudinal elastic support structure is provided between the slow flow plate (4) and the inner wall of the frame (1).

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