CN110500159B - Active oil-gas separator - Google Patents
Active oil-gas separator Download PDFInfo
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- CN110500159B CN110500159B CN201910854388.4A CN201910854388A CN110500159B CN 110500159 B CN110500159 B CN 110500159B CN 201910854388 A CN201910854388 A CN 201910854388A CN 110500159 B CN110500159 B CN 110500159B
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- oil
- shell
- central shaft
- gas
- separation disc
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
- F01M2013/0422—Separating oil and gas with a centrifuge device
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an active oil-gas separator which comprises a shell, wherein an oil-gas separation mechanism is arranged between the middle upper part of a central shaft in the shell and the shell, and a driving mechanism for driving the central shaft to rotate is arranged between the bottom of the central shaft and the shell; the top of the shell is provided with an air inlet for introducing blowby gas of the internal combustion engine, the side wall of the shell at the bottom of the oil-gas separation mechanism is provided with a purified gas outlet, and the side wall of the shell below the driving mechanism is provided with an oil return port for lubricating oil to flow out; the oil-gas separation mechanism comprises an upper end cover of the separation disc, a lower end cover of the separation disc and middle separation discs connected on a central shaft between the upper end cover of the separation disc and the lower end cover of the separation disc; the invention automatically starts working after the motor vehicle is ignited, automatically stops working after flameout, does not need electric control in the working process, can perform high-efficiency oil-gas separation on the blowby gas of the engine, reduces the loss of lubricating oil, can realize long-term stable operation without maintenance, and has very high market value.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to an engine oil-gas separation technology.
Background
The lower part of the crankcase of the internal combustion engine is provided with an oil pan, and the upper part is provided with an upper cover. The internal combustion engine can generate blowby gas in the crankcase in the working process, and the blowby gas is not timely discharged in the crankcase, so that the pressure of the crankcase is too high, and the normal operation of the internal combustion engine is influenced.
Because the blowby gas contains oil, colloid and impurities, the blowby gas is directly put into the atmosphere, which can cause atmospheric pollution and can not reach the national emission standard; blow-by gas may cause the engine oil to lose, resulting in insufficient engine oil.
Disclosure of Invention
The invention aims to provide an active oil-gas separator which has the advantages of higher filtering effect, smaller volume, self-lubricating effect and maintenance-free long-term operation.
In order to achieve the purpose, the active oil-gas separator comprises a shell, wherein a central shaft is arranged in the shell through an upper bearing and a lower bearing, an oil-gas separation mechanism is arranged between the middle upper part of the central shaft and the shell, and a driving mechanism for driving the central shaft to rotate is arranged between the bottom of the central shaft and the shell; the upper bearing is arranged on the shell through an upper bearing seat, and the lower bearing is arranged on the shell through a lower bearing seat; the upper bearing seat is internally provided with a mounting cavity for accommodating the upper bearing, and an opening for oil gas to pass through in the up-down direction is arranged on the upper bearing seat outside the mounting cavity;
the top of the shell is provided with an air inlet which is communicated with an opening on the upper bearing seat; the air inlet is used for introducing blow-by gas of the internal combustion engine;
The side wall of the shell at the bottom of the oil-gas separation mechanism is provided with a clean gas outlet, a cavity is arranged between the oil-gas separation mechanism and the shell, and the cavity is communicated with the clean gas outlet;
An oil return port for lubricating oil to flow out is arranged on the side wall of the shell below the driving mechanism;
The oil-gas separation mechanism comprises a separation disc upper end cover fixedly connected with the upper part of the central shaft, a separation disc lower end cover connected with the lower part of the central shaft, and each middle separation disc connected on the central shaft between the separation disc upper end cover and the separation disc lower end cover;
The upper end cover of the separation disc comprises a bowl body with an upward opening, a through hole is arranged at the bottom of the bowl body, a fixed sleeve fixedly sleeved on the central shaft is arranged in the center of the through hole, the fixed sleeve is connected with the inner wall of the through hole through connecting rib plates, more than two connecting rib plates are uniformly arranged along the circumferential direction of the fixed sleeve, and openings for oil gas to pass through are formed by surrounding the adjacent connecting rib plates, the inner wall of the through hole and the outer wall of the fixed sleeve;
the central shaft is provided with an external spline; each middle separation disc has the same structure and comprises a central ring sleeved on a central shaft, a plurality of radial ribs are uniformly connected to the radial outer surface of the central ring at intervals along the circumferential direction of the central ring, each radial rib comprises a horizontal section positioned in the same plane with the central ring, an inclined section extending outwards along the radial direction and extending upwards along the axial direction, and a bending section, the horizontal section, the inclined section and the bending section are sequentially connected, and the included angle between the bending section and the horizontal plane is smaller than the included angle between the inclined section and the horizontal plane;
The distance between the top end of the bending section and the plane of the horizontal section is H millimeter, the distance between the inclined section and the plane of the horizontal section is H1 millimeter, H1 is more than or equal to 0.5H, and the included angle between the inclined section and the bending section is alpha which is more than or equal to 5 degrees and less than or equal to 45 degrees; the thickness of the inclined section is larger than that of the bending section;
the inner surface of the center ring is provided with an inner spline matched with the outer spline, and each middle separation disc is in transmission connection with the center shaft through the inner spline and the outer spline;
The top ends of the inclined sections of the radial ribs are connected with first circumferential annular ribs, and the top ends of the bending sections of the radial ribs are connected with second circumferential annular ribs;
A plurality of openings are formed among the central ring, each radial rib, the first circumferential annular rib and the second circumferential annular rib in a surrounding manner;
the lower end cover of the separation disc comprises a bowl body with an upward opening, and a central shaft penetrates through the bottom of the bowl body and is in sliding fit with the bowl body; the lower surface of the lower end cover of the separation disc is provided with a lower spring groove, a central shaft below the lower end cover of the separation disc is provided with a lower step, a central shaft between the lower step and the lower spring groove is sleeved with a lower spring, and the lower spring upwards pushes the lower end cover of the separation disc, each middle separation disc and the upper end cover of the separation disc together;
an axial passage for oil gas to pass through is formed among the opening on the upper bearing seat, the opening of the upper end cover of the separation disc and the opening of each middle separation disc;
Centrifugal passages for oil-gas separation are formed between the bowl body of the upper end cover of the separation disc and the radial ribs of the middle separation disc at the top end, centrifugal passages for oil-gas separation are formed between the radial ribs of the adjacent middle separation discs, and centrifugal passages for oil-gas separation are formed between the radial ribs at the bottom end and the bowl body of the lower end cover of the separation disc;
the inner wall of the shell is communicated with the oil return port through the oil return passage.
The oil return passage comprises an annular oil collecting groove, an oil collecting plate positioned below the annular oil collecting groove, a lower bearing, an opening on the lower bearing seat and a shell inner cavity; the radial outer surface of the oil collecting groove is in sealing fit with the inner wall of the shell, an opening which is positioned above the oil collecting plate and used for oil passing is formed in the bottom of the oil collecting groove, an opening through which oil passes is formed in the side wall of the lower bearing seat, an oil collecting cavity is formed in the inner cavity of the shell below the oil collecting plate, and the driving mechanism is positioned at the upper part of the oil collecting cavity; the axial direction pointing to the central shaft is taken as the inward direction, the reverse direction is taken as the outward direction, the oil collecting plate is high at the outer side and low at the inner side, and the inner end of the oil collecting plate is communicated with the top of the lower bearing.
The driving mechanism comprises an impeller in threaded connection with the bottom of the central shaft and an oil injection pipe arranged on the shell, the impeller comprises a body and a plurality of main blades uniformly arranged on the body, and the oil injection pipe is connected with a high-pressure section in a motor vehicle lubrication oil path;
The oil injection pipe is internally provided with an oil injection hole, an oil injection hole of the oil injection hole faces the side wall of the main blade, the direction opposite to the oil injection hole deviates from the central line of the central shaft, and the direction of the pressure of the main blade, which is born by the oil injection of the oil injection pipe, is the screwing direction of the impeller on the central shaft; the vertical section of the oil spraying hole and the oil spraying hole are both elliptical, and the major axis direction of the ellipse is the vertical direction.
The top of the body of the impeller is provided with a plurality of auxiliary blades, and the rotation direction of each auxiliary blade is the same as that of the main blade; the oil collecting plate is downwards connected with a horizontal plate, and a negative pressure area is formed between the horizontal plate and the auxiliary blade when the impeller rotates; and an opening on the side wall of the lower bearing seat is positioned in the negative pressure area.
The bottom of the installation cavity of the upper bearing seat is provided with an opening which is penetrated up and down, an upper step is arranged on a central shaft below the opening, an upper spring is sleeved on the central shaft between the upper step and the upper bearing, the bottom end of the upper spring is in jacking fit with the upper step, and the upper end of the upper spring stretches into the opening and is in jacking fit with the inner ring of the upper bearing.
An inner hole is formed in the central shaft along the axial direction of the central shaft, a gap is formed between the upper bearing and the top wall of the mounting cavity, and the upper end of the inner hole is communicated with the gap; the gap, the upper bearing and the opening at the bottom of the mounting cavity form a return channel for lubricating oil sucked into the inner hole to flow out;
The bottom of the inner hole is connected with more than one oil through hole, and the oil through hole is used for sucking lubricating oil at the bottom of the inner cavity of the shell into the inner hole;
The shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are connected together in a clamping or threaded manner.
An arc-shaped groove with an open lower end is formed between the adjacent main blades of the impeller.
The radial inner surface of oil collecting groove is connected with the division board, and the middle part of division board is equipped with the centre bore that is used for the center pin to pass, and the centre bore is linked together with the lower bearing downwards.
The invention has the following advantages:
The invention can be used for carrying out high-efficiency oil-gas separation on the engine blowby gas, so that the tail gas emission of the motor vehicle reaches the emission standard required by China six. The invention can effectively separate out the lubricating oil in the blowby gas and lead the lubricating oil back to the oil pan of the crankcase of the engine, thereby reducing the loss of the lubricating oil. The overall flow resistance of the structure is low; the invention can realize long-term automatic and stable operation, has good oil-gas separation effect and no maintenance, and has good market application prospect.
The arrangement of the bending section prolongs the length of the centrifugal passage, and increases the probability of collision of oil mist particles in the blowby gas in the centrifugal passage, thereby increasing the separation efficiency of the oil-gas separation mechanism, and simultaneously reducing the space size occupied by the oil-gas separation mechanism on the premise of realizing the centrifugal passage with the same length, so that the invention can be suitable for motor vehicles with limited inner space.
The thickness of the inclined section of the radial rib is greater than that of the bent section, so that a gap can be generated between the bent sections between the two middle separation discs adjacent up and down, lubricating oil in blowby gas is collected by the horizontal section and the inclined section, and the lubricating oil attached to the inclined section is thrown outwards upwards by the gap between the bent sections, so that the oil-gas separation efficiency is improved. H1 And the length of a path (the length of a radial rib inclined section) for collecting lubricating oil is longer in the process of oil-gas separation, and the collecting efficiency of the lubricating oil is better. The included angle between the inclined section and the bending section is alpha, and if the alpha is too small, the oil-gas separation effect is not obviously improved; if alpha is too large, lubricating oil is easily blocked at the bending section of the separation disc in the middle of the upper layer to rebound and cannot be thrown out, and the oil-gas separation efficiency is reduced. Alpha is more than or equal to 5 degrees and less than or equal to 45 degrees, so that the oil-gas separation effect can be improved, and the rebound of lubricating oil is avoided. Alpha is preferably 10 deg..
The oil return passage comprises a lower bearing seat and a lower bearing, can automatically lubricate the lower bearing, and provides a guarantee for long-term maintenance-free operation of the invention.
The invention uses the lubricating oil with higher pressure in the motor vehicle as power, drives the central shaft to drive the oil-gas separation mechanism to rotate by the impeller, does not need to additionally arrange a power device and a control device, has simple structure and provides guarantee for maintenance-free operation.
The vertical section of the oil spraying hole and the oil spraying opening are elliptical, so that the contact area (the area of the stress surface) of sprayed lubricating oil and the main blade can be enlarged, the acting effect of oil spraying on the main blade is better, and the conversion efficiency of kinetic energy of oil spraying to the rotation energy of the central shaft is improved. The impeller and the main blades are contacted with lubricating oil for a long time in the rotating operation, and if no anti-loosening measure is adopted, the impeller is easy to loose or even fall off on the central shaft in the long-term use.
The main blade is in the screwing direction of the impeller on the central shaft due to the pressure direction of the oil injection pipe, so that the technical effect of preventing the impeller from loosening can be automatically and continuously realized in the long-term operation process, and a foundation is provided for maintenance-free operation of the invention.
If the impeller and the central shaft adopt a conventional connection mode of optical axis transition fit, because the torque is transmitted by solely depending on friction force, when the torque is larger than the friction force, the phenomenon that the impeller and the shaft do not rotate relatively or do not synchronously occurs, and therefore the impeller and the shaft are easy to wear. In the invention, the impeller is in threaded connection with the central shaft, so that the phenomenon that the impeller and the shaft do not synchronously rotate is avoided.
The opening on the side wall of the lower bearing seat is positioned in the negative pressure area, so that oil in the lower bearing seat and the lower bearing can be sucked into the inner cavity of the shell outwards, an oil return passage is smoother, the phenomenon of blocking at the lower bearing seat and the lower bearing is avoided, and meanwhile, lubricating oil sprayed out of an oil spraying port is prevented from entering the lower bearing, so that the invention is an important guarantee for long-term maintenance-free operation.
The upper spring transmits torque to the inner ring of the upper bearing, so that the abrasion of the upper end part of the central shaft and the inner ring of the bearing caused by the relative sliding between the inner ring of the upper bearing and the upper end part of the central shaft is avoided, the service life of a related structure of the matching part of the upper bearing and the central shaft is further prolonged, and the long-term maintenance-free stable operation of the invention is ensured.
When the oil mist generator works, under the action of pressure difference generated by rotation of the central shaft, the lubricating oil mist at the bottom of the inner cavity of the shell is sucked into the inner hole of the central shaft through the oil through hole, and then the oil mist downwards enters the axial passage for oil gas to pass through the backflow passage.
The arrangement of the inner bore and the return passage has three functions: ① The oil mist produces the lubrication action to the upper bearing when passing through the upper bearing through the backflow channel, so that the upper bearing can be ensured to be free of maintenance and normal operation for a long time. ② The oil mist passes through the backflow channel and then enters the axial passage for oil gas to pass through, and when passing through each middle separation disc, the oil mist can clean colloid and impurities on the middle separation disc, so that the gap between adjacent middle separation discs is prevented from being blocked, and long-term maintenance-free operation is ensured. ③ When passing through each middle separation disc, the separation discs are thrown onto the inner wall of the shell under the action of centrifugal force to form a flowing oil film, so that colloid and impurities separated from blow-by gas are prevented from being adhered to the inner wall of the shell, and long-term maintenance-free operation of the invention is ensured.
An arc-shaped groove with an open lower end is formed between adjacent main blades of the impeller, so that lubricating oil sprayed on the main blades can smoothly flow out of the impeller under the action of gravity, and further can flow out through an oil return port.
In a word, the invention can automatically start to work after the ignition of the motor vehicle, automatically stop to work after the flameout of the motor vehicle, does not need electric control in the whole working process, does not need an additional power device, can carry out high-efficiency oil-gas separation on the blowby gas of the engine, reduces the loss of lubricating oil, can realize long-term stable operation without maintenance, and has very high market value.
Drawings
FIG. 1 is a schematic view of the structure of the present invention, with arrows in FIG. 1 being the path of the blow-by gas through the axial passage and the centrifugal passage and the path of the blow-by gas out of the purge gas outlet;
FIG. 2 is a schematic view of the structure of the present invention, and the arrows in FIG. 2 are paths for lubricating oil in the blow-by gas to flow to the bottom of the housing cavity;
FIG. 3 is a schematic view of the structure of a middle split disc;
FIG. 4 is a schematic view of the structure of the central shaft mated with the upper end cap of the separating disc and the middle separating discs (when the middle separating discs are not pressed together);
FIG. 5 is a schematic view of the structure of the oil receiving plate;
FIG. 6 is a schematic structural view of an impeller;
FIG. 7 is a schematic view of a structure of a fuel injection pipe at a fuel injection port;
FIG. 8 is an enlarged view at A in FIG. 1;
fig. 9 is an enlarged view at B in fig. 1;
fig. 10 is an enlarged view of fig. 2C.
Detailed Description
As shown in fig. 1 to 10, the active oil-gas separator of the invention comprises a shell 1, a central shaft 4 is arranged in the shell 1 through an upper bearing 2 and a lower bearing 3, an oil-gas separation mechanism is arranged between the middle upper part of the central shaft 4 and the shell 1, and a driving mechanism for driving the central shaft 4 to rotate is arranged between the bottom of the central shaft 4 and the shell 1; the upper bearing 2 is arranged on the shell 1 through an upper bearing seat 5, and the lower bearing 3 is arranged on the shell 1 through a lower bearing seat 6; the upper bearing seat 5 is internally provided with a mounting cavity for accommodating the upper bearing 2, and the upper bearing seat 5 outside the mounting cavity is provided with an opening 7 for oil gas to pass through in the up-down direction;
The top of the shell 1 is provided with an air inlet 8, and the air inlet 8 is communicated with an opening on the upper bearing seat 5; the air inlet 8 is used for being communicated with an upper cover of a crankcase of the internal combustion engine through a pipeline so as to introduce blow-by gas of the internal combustion engine;
The side wall of the shell 1 at the bottom of the oil-gas separation mechanism is provided with a purified gas outlet 10, and the purified gas outlet 10 is used for being communicated with an exhaust gas discharge pipeline of the motor vehicle through a pipeline and can also be connected with an air inlet 8 of a turbo booster pump so as to utilize exhaust gas; a cavity 11 is arranged between the oil-gas separation mechanism and the shell 1, and the cavity 11 is communicated with the purified gas outlet 10;
The side wall of the housing 1 below the drive mechanism is provided with an oil return opening 12 for the outflow of lubricating oil, the oil return opening 12 being in communication with the upper part of the oil sump of the crankcase in use.
The oil-gas separation mechanism comprises a separation disc upper end cover 13 fixedly connected with the upper part of the central shaft 4 through injection molding or other processes, a separation disc lower end cover 14 connected with the lower part of the central shaft 4, and each middle separation disc 15 connected on the central shaft 4 between the separation disc upper end cover 13 and the separation disc lower end cover 14;
the upper end cover 13 of the separation disc comprises a bowl body 16 with an upward opening, a through hole 17 is arranged at the bottom of the bowl body 16, a fixed sleeve 18 fixedly sleeved on the central shaft 4 is arranged in the center of the through hole 17, the fixed sleeve 18 is connected with the inner wall of the through hole through a connecting rib plate 19, more than two connecting rib plates 19 are uniformly arranged along the circumferential direction of the fixed sleeve 18, and an opening 20 for oil gas to pass through is formed by surrounding the adjacent connecting rib plates 19, the inner wall of the through hole 17 and the outer wall of the fixed sleeve 18;
The central shaft 4 is provided with external splines 21 (for clarity of illustration of the internal splines 26, the lowest middle separating disc in fig. 4 is not shown with external splines, and in practice there are also external splines 21); each middle separation disc 15 has the same structure and comprises a central ring 22 sleeved on the central shaft 4, a plurality of radial ribs are uniformly connected to the radial outer surface of the central ring 22 at intervals along the circumferential direction of the central ring, each radial rib comprises a horizontal section 23 positioned in the same plane with the central ring 22, an inclined section 24 extending outwards along the radial direction and extending upwards along the axial direction, and a bending section 25, and the horizontal section 23, the inclined section 24 and the bending section 25 are sequentially connected; the horizontal section 23, the inclined section 24 and the bending section 25 can be integrally arranged or can be connected together after being arranged in a split mode; the angle between the bending section 25 and the horizontal plane is smaller than the angle between the inclined section 24 and the horizontal plane;
The distance between the top end of the bending section 25 and the plane of the horizontal section 23 is H millimeter, the distance between the inclined section 24 and the plane of the horizontal section 23 is H1 millimeter, H1 is more than or equal to 0.5H, and the included angle between the inclined section 24 and the bending section 25 is alpha, which is more than or equal to 5 degrees and less than or equal to 45 degrees as shown in figure 3; the thickness of the horizontal section 23 is greater than that of the inclined section 24, and the thickness of the inclined section 24 is greater than that of the bending section 25;
The inner surface of the center ring 22 is provided with an inner spline 26 matched with the outer spline 21, and each middle separating disc 15 is in transmission connection with the center shaft 4 through the inner spline 26 and the outer spline 21;
A first circumferential annular rib 27 is connected between the top ends of the inclined sections 24 of each radial rib, and a second circumferential annular rib 28 is connected between the top ends of the bending sections 25 of each radial rib;
the central ring 22, the radial ribs, the first circumferential annular rib 27 and the second circumferential annular rib 28 enclose a plurality of openings; this is shown by reference numeral 29 in fig. 4.
The split disc lower end cap 14 includes an upwardly opening bowl where the bowl is indicated by 14 in fig. 1. The central shaft 4 passes through the bottom of the bowl body and is in sliding fit with the bowl body; the lower surface of the separation disc lower end cover 14 is provided with a lower spring groove 30, a lower step 31 is arranged on the central shaft 4 below the separation disc lower end cover 14, a lower spring 32 is sleeved on the central shaft 4 between the lower step 31 and the lower spring groove 30, and the lower spring 32 pushes the separation disc lower end cover 14, each middle separation disc 15 and the separation disc upper end cover 13 together upwards;
an axial passage for oil gas to pass through is formed among the opening 7 on the upper bearing seat 5, the opening 20 of the upper end cover 13 of the separation disc and the opening 29 of each middle separation disc 15;
centrifugal passages 33 for oil-gas separation are formed between the bowl body 16 of the upper end cover 13 of the separation disc and the radial ribs of the middle separation disc 15 at the top end, centrifugal passages 33 for oil-gas separation are formed between the radial ribs of the adjacent middle separation disc 15, and centrifugal passages 33 for oil-gas separation are formed between the radial ribs at the bottom end and the bowl body of the lower end cover 14 of the separation disc;
The inner wall of the shell 1 is communicated with an oil return port 12 through an oil return passage.
The arrangement of the bending section 25 prolongs the length of the centrifugal passage 33, and increases the probability of collision of oil mist particles in the blowby gas in the centrifugal passage 33, thereby increasing the separation efficiency of the oil-gas separation mechanism, and simultaneously reducing the space size occupied by the oil-gas separation mechanism on the premise of realizing the centrifugal passage 33 with the same length, so that the invention can be suitable for motor vehicles with limited inner space.
The thickness of the inclined section 24 of the radial rib is greater than that of the bent section 25, so that a gap can be generated between the bent sections 25 between two adjacent middle separation discs 15, lubricating oil in blow-by gas is collected by the horizontal section 23 and the inclined section 24, and the lubricating oil attached to the inclined section 24 is thrown outwards upwards by the gap between the bent sections 25, so that the oil-gas separation efficiency is improved. H1 And the length of a path (the length of the radial rib inclined section 24) for collecting lubricating oil is longer in the process of oil-gas separation and is more than or equal to 0.5H, and the collecting efficiency of the lubricating oil is better. The included angle between the inclined section 24 and the bending section 25 is alpha, and if the alpha is too small, the oil-gas separation effect is not obviously improved; if α is too large, the lubricating oil is easily blocked at the bending section 25 of the upper middle separation disc 15 to rebound and cannot be thrown out, but the oil-gas separation efficiency is reduced. Alpha is more than or equal to 5 degrees and less than or equal to 45 degrees, so that the oil-gas separation effect can be improved, and the rebound of lubricating oil is avoided. Alpha is preferably 10 deg..
The oil return passage comprises an annular oil collecting groove 34, an oil collecting plate 35 positioned below the annular oil collecting groove 34, a lower bearing 3, an opening on a lower bearing seat 6 and an inner cavity (precisely an oil collecting cavity 36) of the shell 1; the radial outer surface of the oil collecting groove 34 is in sealing fit with the inner wall of the shell 1, so that oil leakage is prevented, and sealing can be realized by adopting a sealing groove matched with a sealing ring, which is a conventional technology and is not described in detail. The bottom of the oil collecting groove 34 is provided with an opening (the opening is not shown here) which is positioned above the oil collecting plate 35 and used for oil passing, the side wall of the lower bearing seat 6 is provided with an opening (the opening of the side wall of the lower bearing seat 6 is not shown here) used for oil passing, the inner cavity of the shell 1 below the oil collecting plate 35 forms an oil collecting cavity 36, and the driving mechanism is positioned at the upper part of the oil collecting cavity 36; the axial direction pointing to the central shaft is taken as the inward direction, the reverse direction is taken as the outward direction, the oil collecting plate 35 is high at the outside and low at the inside, and the inner end of the oil collecting plate 35 is communicated with the top of the lower bearing 3.
The oil return passage passes through the lower bearing seat 6 and the lower bearing 3, can automatically lubricate the lower bearing 3, and provides guarantee for long-term maintenance-free operation of the invention.
The driving mechanism comprises an impeller which is connected with the bottom of the central shaft 4 in a threaded way and an oil injection pipe 37 which is arranged on the shell 1, wherein the impeller comprises a body 38 and a plurality of main blades 39 which are uniformly arranged on the body 38, and the oil injection pipe 37 is connected with a high-pressure section in a motor vehicle lubricating oil path;
The oil spray pipe 37 is internally provided with an oil spray hole, an oil spray opening 41 of the oil spray hole faces the side wall of the main blade 39, the direction opposite to the oil spray opening 41 deviates from the central line of the central shaft 4, and the direction of the pressure of the main blade 39, which is subjected to oil spray by the oil spray pipe 37, is the screwing direction of the impeller on the central shaft 4; the vertical section of the oil jet hole and the oil jet port 41 are both elliptical, and the major axis direction of the ellipse is the vertical direction.
The invention uses the lubricating oil with higher pressure in the motor vehicle as power, drives the central shaft 4 to drive the oil-gas separation mechanism to rotate by the impeller, does not need to additionally arrange a power device and a control device, has simple structure and provides guarantee for maintenance-free operation.
The vertical section of the oil spraying hole and the oil spraying port 41 are all elliptical, so that the contact area (the area of the stress surface) of sprayed lubricating oil and the main blade 39 can be enlarged, the acting effect of oil spraying on the main blade 39 is better, and the conversion efficiency of the kinetic energy of oil spraying to the rotational energy of the central shaft 4 is improved. The impeller and the main blades 39 are in contact with the lubricating oil for a long period of time during the rotation operation, and if no anti-loosening means is provided, the impeller is liable to come loose or even fall off on the center shaft 4 during the long-term use.
The main blade 39 is screwed on the central shaft 4 because the pressure direction of the oil injection pipe 37 is the screwing direction of the impeller, so that the technical effect of preventing the impeller from loosening can be automatically and continuously realized in the long-term operation process, and the foundation is provided for the maintenance-free operation of the invention.
If the impeller and the central shaft 4 adopt a conventional connection mode of optical axis transition fit, because the torque is transmitted by solely depending on friction force, when the torque is larger than the friction force, the phenomenon that the impeller and the shaft do not rotate relatively or do not rotate synchronously can occur, and therefore the impeller and the shaft are easy to wear. In the invention, the impeller is in threaded connection with the central shaft 4, so that the phenomenon that the impeller and the shaft do not synchronously rotate is avoided.
The top of the body 38 of the impeller is provided with a plurality of auxiliary blades 40, and the rotation direction of the auxiliary blades 40 is the same as that of the main blades 39; the oil collecting plate 35 is connected with a horizontal plate 43 downwards, and a negative pressure area 42 is formed between the horizontal plate 43 and the auxiliary blades 40 when the impeller rotates; the openings in the side walls of the lower bearing block 6 are located in said negative pressure zone 42.
The openings on the side wall of the lower bearing seat 6 are positioned in the negative pressure area 42, so that the oil in the lower bearing seat 6 and the lower bearing 3 can be sucked into the inner cavity of the shell 1 outwards, an oil return passage is smoother, the phenomenon of blocking at the lower bearing seat 6 and the lower bearing 3 is avoided, and meanwhile, the lubricating oil sprayed out of the oil spraying port 41 is prevented from entering the lower bearing 3, so that the invention is an important guarantee for long-term maintenance-free operation.
An opening 44 which penetrates up and down is arranged at the bottom of the installation cavity of the upper bearing seat 5, an upper step 45 is arranged on the central shaft 4 below the opening 44, an upper spring 46 is sleeved on the central shaft 4 between the upper step 45 and the upper bearing 2, the bottom end of the upper spring 46 is in jacking fit with the upper step 45, and the upper end of the upper spring 46 stretches into the opening and is in jacking fit with the inner ring of the upper bearing 2.
The upper spring 46 transmits torque to the inner ring of the upper bearing 2, so that the upper end part of the central shaft 4 and the inner ring of the bearing are prevented from being worn due to relative sliding between the inner ring of the upper bearing 2 and the upper end part of the central shaft 4, the service life of a relevant structure at the matching part of the upper bearing 2 and the central shaft 4 is further prolonged, and the long-term maintenance-free stable operation of the invention is ensured.
An inner hole 47 is formed in the central shaft 4 along the axial direction of the central shaft 4, a gap 48 is formed between the upper bearing 2 and the top wall of the mounting cavity, and the upper end of the inner hole 47 is communicated with the gap 48; the gap 48, the upper bearing 2 and the opening at the bottom of the mounting cavity form a return channel for the outflow of lubricant sucked into the inner bore 47;
the bottom of the inner hole 47 is connected with more than one oil through hole 49, and the oil through hole 49 is used for sucking lubricating oil at the bottom of the inner cavity of the shell 1 into the inner hole 47;
In operation, under the action of the pressure difference generated by the rotation of the central shaft 4, the lubricating oil mist at the bottom of the inner cavity of the shell 1 is sucked into the inner hole 47 of the central shaft 4 through the oil through hole 49, and then the oil mist enters the axial passage for oil gas to pass through downwards through the backflow passage.
The provision of the internal bore 47 and the return passage has three functions: ① The oil mist can lubricate the upper bearing 2 when flowing through the upper bearing 2 through the backflow channel, so that the upper bearing 2 can be ensured to normally operate without maintenance for a long time. ② The oil mist passes through the backflow channel and then enters the axial passage for oil gas to pass through, and when passing through each middle separation disc 15, the oil mist can clean colloid and impurities on the middle separation discs 15, so that the gap between adjacent middle separation discs 15 is prevented from being blocked, and long-term maintenance-free operation is ensured. ③ When passing through each middle separation disc 15, the oil film is formed after being thrown onto the inner wall of the shell 1 under the action of centrifugal force, so that colloid and impurities separated from blow-by gas are prevented from being adhered to the inner wall of the shell 1, and the long-term maintenance-free operation of the invention is ensured.
The shell 1 comprises an upper shell and a lower shell, and the upper shell and the lower shell are connected together in a clamping or threaded manner.
The shell 1 is divided into an upper shell and a lower shell, so that the active oil-gas separator is convenient to assemble. Of course, the housing 1 may be divided into a left housing 1 and a right housing 1, which also has the technical effect of being convenient for assembly. Such conventional modifications fall within the scope of the present invention.
An arcuate slot 50 open at the lower end is formed between adjacent main blades 39 of the impeller.
An arc-shaped groove 50 with an open lower end is formed between the adjacent main blades 39 of the impeller, so that lubricating oil sprayed on the main blades 39 can smoothly flow out of the impeller under the action of gravity, and can further flow out through the oil return port 12.
The radial inner surface of the oil collecting groove 34 is connected with a division plate 9, the middle part of the division plate 9 is provided with a central hole for the central shaft 4 to pass through, and the central hole is downwards communicated with the lower bearing 3.
The partition plate 9 and the oil collecting plate 35 form two isolation structures, so that gas components in the blow-by gas are difficult to enter the oil collecting cavity 36 at the bottom of the shell 1, and the gas components in the blow-by gas can be discharged more thoroughly.
When the invention is used, the invention is arranged on a motor vehicle, the oil return port 12 is communicated with the upper part of the oil pan of the crankcase, the air inlet 8 is communicated with the upper cover of the crankcase of the internal combustion engine, the clean air outlet 10 is communicated with the tail gas discharge pipeline of the motor vehicle, and the oil injection pipe 37 is communicated with a high-pressure section in the lubrication oil path of the motor vehicle.
After the ignition of the motor vehicle, the invention has the processes of simultaneously carrying out power oil circulation, upper bearing 2 lubricating oil circulation, oil-gas separation, lower bearing 3 lubrication and the like.
The power oil cycle is: the oil spray pipe 37 sprays the motor vehicle lubricating oil on the side wall of the main blade 39 of the impeller through the oil spray opening 41, so that the oil pressure of the motor vehicle lubricating oil is utilized to push the impeller to rotate, and a power device is not required to be separately arranged. The impeller drives the oil-gas separation mechanism to rotate at a high speed through the central shaft 4. The lubricating oil sprayed on the main blades 39 of the impeller naturally flows downward under the action of gravity into the bottom of the inner cavity of the casing 1, and flows back into the oil pan of the crankcase through the oil return port 12 so as to return to the normal circulation path of the lubricating oil of the motor vehicle.
The upper bearing 2 lubricating oil circulation is: under the action of the pressure difference generated by the rotation of the central shaft 4, the lubricating oil mist at the bottom of the inner cavity of the shell 1 is sucked into the inner hole 47 of the central shaft 4 through the oil through holes 49, then the oil mist enters the axial passage for oil gas to pass through downwards through the backflow passage, and then returns to the bottom of the inner cavity of the shell 1 again. In this process, the lubricating oil mist produces a lubricating effect on the upper bearing 2 when flowing through the upper bearing 2.
The oil-gas separation and the lubrication of the lower bearing 3 are as follows: after the engine blow-by gas and the oil mist for lubricating the upper bearing 2 enter the axial passage, a part of the lubricating oil is adsorbed on the radial ribs while flowing through each intermediate split disk 15. As shown in fig. 1 and 2, under the action of centrifugal force generated by rotation of the oil-gas separation mechanism, lubricating oil is thrown out along the centrifugal passage 33, and after striking the inner wall of the shell 1, the lubricating oil flows downwards along the inner wall of the shell 1 into the annular oil collecting groove 34 and then falls down onto the oil collecting plate 35, flows through the lower bearing 3, passes through the opening of the side wall of the lower bearing seat 6 and flows into the bottom of the inner cavity of the shell 1. The lubricating oil lubricates the lower bearing 3 while flowing through the lower bearing 3. As shown in fig. 1, the gas in the blow-by gas enters the centrifugal passage 33 along the axial passage, then enters the clean gas outlet 10 through the cavity between the oil-gas separation mechanism and the housing 1, and finally is discharged through the exhaust gas discharge pipeline.
After the motor vehicle is flamed out, the active oil-gas separator of the invention loses power source and naturally stops working. Therefore, the invention can automatically start working after the ignition of the motor vehicle, automatically stop working after the flameout of the motor vehicle, does not need electric control in the whole working process, does not need an additional power device, can perform high-efficiency oil-gas separation on the blowby gas of the engine, reduces the loss of lubricating oil, can realize long-term stable operation without maintenance, and has very high market value.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (7)
1. Active oil and gas separator, including casing, its characterized in that: a central shaft is arranged in the shell through an upper bearing and a lower bearing, an oil-gas separation mechanism is arranged between the middle upper part of the central shaft and the shell, and a driving mechanism for driving the central shaft to rotate is arranged between the bottom of the central shaft and the shell; the upper bearing is arranged on the shell through an upper bearing seat, and the lower bearing is arranged on the shell through a lower bearing seat; the upper bearing seat is internally provided with a mounting cavity for accommodating the upper bearing, and an opening for oil gas to pass through in the up-down direction is arranged on the upper bearing seat outside the mounting cavity;
the top of the shell is provided with an air inlet which is communicated with an opening on the upper bearing seat; the air inlet is used for introducing blow-by gas of the internal combustion engine;
The side wall of the shell at the bottom of the oil-gas separation mechanism is provided with a clean gas outlet, a cavity is arranged between the oil-gas separation mechanism and the shell, and the cavity is communicated with the clean gas outlet;
An oil return port for lubricating oil to flow out is arranged on the side wall of the shell below the driving mechanism;
The oil-gas separation mechanism comprises a separation disc upper end cover fixedly connected with the upper part of the central shaft, a separation disc lower end cover connected with the lower part of the central shaft, and each middle separation disc connected on the central shaft between the separation disc upper end cover and the separation disc lower end cover;
The upper end cover of the separation disc comprises a bowl body with an upward opening, a through hole is arranged at the bottom of the bowl body, a fixed sleeve fixedly sleeved on the central shaft is arranged in the center of the through hole, the fixed sleeve is connected with the inner wall of the through hole through connecting rib plates, more than two connecting rib plates are uniformly arranged along the circumferential direction of the fixed sleeve, and openings for oil gas to pass through are formed by surrounding the adjacent connecting rib plates, the inner wall of the through hole and the outer wall of the fixed sleeve;
the central shaft is provided with an external spline; each middle separation disc has the same structure and comprises a central ring sleeved on a central shaft, a plurality of radial ribs are uniformly connected to the radial outer surface of the central ring at intervals along the circumferential direction of the central ring, each radial rib comprises a horizontal section positioned in the same plane with the central ring, an inclined section extending outwards along the radial direction and extending upwards along the axial direction, and a bending section, the horizontal section, the inclined section and the bending section are sequentially connected, and the included angle between the bending section and the horizontal plane is smaller than the included angle between the inclined section and the horizontal plane;
The distance between the top end of the bending section and the plane of the horizontal section is H millimeter, the distance between the inclined section and the plane of the horizontal section is H1 millimeter, H1 is more than or equal to 0.5H, and the included angle between the inclined section and the bending section is alpha which is more than or equal to 5 degrees and less than or equal to 45 degrees; the thickness of the inclined section is larger than that of the bending section;
the inner surface of the center ring is provided with an inner spline matched with the outer spline, and each middle separation disc is in transmission connection with the center shaft through the inner spline and the outer spline;
The top ends of the inclined sections of the radial ribs are connected with first circumferential annular ribs, and the top ends of the bending sections of the radial ribs are connected with second circumferential annular ribs;
A plurality of openings are formed among the central ring, each radial rib, the first circumferential annular rib and the second circumferential annular rib in a surrounding manner;
the lower end cover of the separation disc comprises a bowl body with an upward opening, and a central shaft penetrates through the bottom of the bowl body and is in sliding fit with the bowl body; the lower surface of the lower end cover of the separation disc is provided with a lower spring groove, a central shaft below the lower end cover of the separation disc is provided with a lower step, a central shaft between the lower step and the lower spring groove is sleeved with a lower spring, and the lower spring upwards pushes the lower end cover of the separation disc, each middle separation disc and the upper end cover of the separation disc together;
an axial passage for oil gas to pass through is formed among the opening on the upper bearing seat, the opening of the upper end cover of the separation disc and the opening of each middle separation disc;
Centrifugal passages for oil-gas separation are formed between the bowl body of the upper end cover of the separation disc and the radial ribs of the middle separation disc at the top end, centrifugal passages for oil-gas separation are formed between the radial ribs of the adjacent middle separation discs, and centrifugal passages for oil-gas separation are formed between the radial ribs at the bottom end and the bowl body of the lower end cover of the separation disc;
The inner wall of the shell is communicated with an oil return port through an oil return passage;
The oil return passage comprises an annular oil collecting groove, an oil collecting plate positioned below the annular oil collecting groove, a lower bearing, an opening on the lower bearing seat and a shell inner cavity; the radial outer surface of the oil collecting groove is in sealing fit with the inner wall of the shell, an opening which is positioned above the oil collecting plate and used for oil passing is formed in the bottom of the oil collecting groove, an opening through which oil passes is formed in the side wall of the lower bearing seat, an oil collecting cavity is formed in the inner cavity of the shell below the oil collecting plate, and the driving mechanism is positioned at the upper part of the oil collecting cavity; the axial direction pointing to the central shaft is taken as an inward direction, the reverse direction is taken as an outward direction, the outer height of the oil collecting plate is high, the inner height of the oil collecting plate is low, and the inner end of the oil collecting plate is communicated with the top of the lower bearing;
The bottom of the installation cavity of the upper bearing seat is provided with an opening which is penetrated up and down, an upper step is arranged on a central shaft below the opening, an upper spring is sleeved on the central shaft between the upper step and the upper bearing, the bottom end of the upper spring is in jacking fit with the upper step, and the upper end of the upper spring stretches into the opening and is in jacking fit with the inner ring of the upper bearing.
2. The active oil-gas separator of claim 1, wherein: the driving mechanism comprises an impeller in threaded connection with the bottom of the central shaft and an oil injection pipe arranged on the shell, the impeller comprises a body and a plurality of main blades uniformly arranged on the body, and the oil injection pipe is connected with a high-pressure section in a motor vehicle lubrication oil path;
The oil injection pipe is internally provided with an oil injection hole, an oil injection hole of the oil injection hole faces the side wall of the main blade, the direction opposite to the oil injection hole deviates from the central line of the central shaft, and the direction of the pressure of the main blade, which is born by the oil injection of the oil injection pipe, is the screwing direction of the impeller on the central shaft; the vertical section of the oil spraying hole and the oil spraying hole are both elliptical, and the major axis direction of the ellipse is the vertical direction.
3. The active oil and gas separator of claim 2, wherein: the top of the body of the impeller is provided with a plurality of auxiliary blades, and the rotation direction of each auxiliary blade is the same as that of the main blade; the oil collecting plate is downwards connected with a horizontal plate, and a negative pressure area is formed between the horizontal plate and the auxiliary blade when the impeller rotates; and an opening on the side wall of the lower bearing seat is positioned in the negative pressure area.
4. The active oil and gas separator of claim 3, wherein: an inner hole is formed in the central shaft along the axial direction of the central shaft, a gap is formed between the upper bearing and the top wall of the mounting cavity, and the upper end of the inner hole is communicated with the gap; the gap, the upper bearing and the opening at the bottom of the mounting cavity form a return channel for lubricating oil sucked into the inner hole to flow out;
the bottom of the inner hole is connected with more than one oil through hole, and the oil through hole is used for sucking lubricating oil at the bottom of the inner cavity of the shell into the inner hole.
5. The active oil-gas separator of claim 1, wherein: the shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are connected together in a clamping or threaded manner.
6. The active oil and gas separator of claim 2, wherein: an arc-shaped groove with an open lower end is formed between the adjacent main blades of the impeller.
7. The active oil-gas separator of claim 1, wherein: the radial inner surface of oil collecting groove is connected with the division board, and the middle part of division board is equipped with the centre bore that is used for the center pin to pass, and the centre bore is linked together with the lower bearing downwards.
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| CN111022152B (en) * | 2020-01-08 | 2024-09-24 | 安徽威尔低碳科技股份有限公司 | Centrifugal oil-gas separation device |
| CN111997712A (en) * | 2020-09-04 | 2020-11-27 | 上海弗列加滤清器有限公司 | Filter element assembly and rotary oil-gas separator |
| CN111927596B (en) * | 2020-09-10 | 2025-01-03 | 平原滤清器有限公司 | Impact centrifugal separation disc and active oil-gas separator using the separation disc |
| CN112253626A (en) * | 2020-09-30 | 2021-01-22 | 宁波立达智能控制技术有限公司 | Gas-liquid separator with bypass oil injection structure and oil injection method thereof |
| CN112879122B (en) * | 2021-01-12 | 2025-03-25 | 合肥恒信动力科技股份有限公司 | A spring pressure regulating disc centrifugal separation device |
| CN112870860B (en) * | 2021-03-31 | 2022-10-18 | 德海谛汽车技术(苏州)有限公司 | Gas-liquid separator |
| CN117101316B (en) * | 2023-10-16 | 2024-02-06 | 江苏新凯晟机械设备有限公司 | Oil-gas separation device with double filtering function |
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| CN210686086U (en) * | 2019-09-10 | 2020-06-05 | 平原滤清器有限公司 | Active oil-gas separator |
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| US6925993B1 (en) * | 2004-04-15 | 2005-08-09 | Alfa Laval Corporate Ab | Apparatus for cleaning of crankcase gas |
| DE202007009913U1 (en) * | 2007-07-13 | 2008-11-20 | Hengst Gmbh & Co.Kg | Separator for separating oil mist from the crankcase ventilation gas of an internal combustion engine and internal combustion engine with a separator |
| CN204552883U (en) * | 2015-02-12 | 2015-08-12 | 长城汽车股份有限公司 | For gas and oil separating plant and the vehicle of motor |
| WO2016139715A1 (en) * | 2015-03-02 | 2016-09-09 | 東京濾器株式会社 | Oil separator |
| CN107708870B (en) * | 2015-06-19 | 2019-10-25 | 东京滤器株式会社 | oil separator |
| CN108301949B (en) * | 2018-01-12 | 2023-07-18 | 平原滤清器有限公司 | Fuel filter assembly |
| CN209271676U (en) * | 2018-09-01 | 2019-08-20 | 合肥恒信汽车发动机部件制造有限公司 | A kind of oil return apparatus of active disk whizzer |
| CN110173325B (en) * | 2019-06-28 | 2020-07-24 | 浙江吉利控股集团有限公司 | Active oil-gas separator |
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