Impact centrifugal separation disc and active oil-gas separator using the separation disc

Abstract

The present invention discloses an impact centrifugal separation disc, comprising a bowl body side wall, the bowl body side wall is connected downwardly to a bowl bottom structure; the bowl bottom structure comprises a center ring, the center ring is connected to a plurality of ribs, each rib extends to the inner surface of the bowl body side wall and is fixedly connected to the inner surface of the bowl body side wall; in the bowl bottom structure, the portion other than the center ring and each rib is a hollow structure; the horizontal section of the bowl body side wall is a regular polygon, the edges of the bowl body side wall are used to impact and adhere to oil droplets in the blowby gas, so that small oil droplets merge into large oil droplets at the edges; a plurality of protrusions protruding from the inner surface of the bowl body side wall and used to form an airflow passage are distributed on the inner surface and / or outer surface of the bowl body side wall. The present invention also discloses an active oil-gas separator using the above-mentioned impact centrifugal separation disc. The present invention utilizes the dual effects of centrifugation and impact to improve the oil-gas separation efficiency, which not only makes the gas discharged to the outside cleaner and more environmentally friendly, but also allows more lubricating oil to be recycled.

Description

Technical Field

[0001] The invention relates to the field of mechanical technology, and in particular to an oil-gas separation technology for an internal combustion engine. Background Art

[0002] 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. During the operation of the internal combustion engine, blowby gas will be generated in the crankcase. If the blowby gas is not discharged in time in the crankcase, the crankcase pressure will be too high, affecting the normal operation of the internal combustion engine.

[0003] Since blowby gas contains oil, colloid and impurities, it will cause air pollution if it is directly released into the atmosphere and will not meet national emission standards. Blowby gas will cause the internal combustion engine to lose lubricating oil, resulting in insufficient lubricating oil in the internal combustion engine.

[0004] The density of the oil in the blow-by gas is much greater than the density of the gas therein. When the blow-by gas passes through the rotating separation disc, the oil in the blow-by gas can be separated from the gas by centrifugal action, thereby recovering the lubricating oil in the blow-by gas and purifying the exhaust gas to a certain extent.

[0005] The current separation discs only rely on centrifugal action to achieve oil and gas separation, and the separation effect is difficult to further improve. Summary of the invention

[0006] The object of the present invention is to provide an impact centrifugal separation disc for improving the oil-gas separation effect through impact and centrifugal action.

[0007] To achieve the above-mentioned purpose, the impact centrifugal separation disc of the present invention comprises a bowl body side wall which is larger at the top and smaller at the bottom, and the bowl body side wall is connected downwardly to a bowl bottom structure; the bowl bottom structure comprises a center ring for driving connection with the center shaft of the active oil-gas separator, and the center ring is connected to a plurality of ribs, and each rib extends to the inner surface of the bowl body side wall and is fixedly connected to the inner surface of the bowl body side wall; in the bowl bottom structure, the portion other than the center ring and each rib is a hollow structure;

[0008] The horizontal cross-section of the bowl body side wall is a regular polygon with the number of sides being greater than or equal to 4, and the edges of the bowl body side wall are used to impact and adhere to oil droplets in the blowby gas, so that small oil droplets merge into large oil droplets at the edges;

[0009] A plurality of protrusions protruding from the inner surface of the side wall of the bowl body and used for forming an air flow passage are distributed on the inner surface and / or outer surface of the side wall of the bowl body.

[0010] The center ring is a regular polygon; the horizontal section of the side wall of the bowl body is a regular 36-gon.

[0011] The protrusion is in the shape of an oblique rib or an arc rib, and the protrusion corresponds to the rib plate one by one and is connected as a whole.

[0012] The raised part comprises an upper and a lower part, wherein the lower raised part is the ribs connected to the inner surface of the side wall of the bowl body, and the upper raised part is a plurality of convex points.

[0013] The present invention also discloses an active oil-gas separator using the impact centrifugal separation disc, comprising a housing, a central shaft is installed in the housing through an upper bearing and a lower bearing, an oil-gas separation mechanism is provided at the middle and upper part of the central shaft, and a driving mechanism for driving the central shaft to rotate is provided at the bottom of the central shaft;

[0014] The top of the housing is provided with an air inlet for communicating with the upper cover of the crankcase of the internal combustion engine to introduce blow-by gas, and the air inlet is communicated with the top of the oil-gas separation mechanism;

[0015] A clean gas outlet is provided on the side wall of the shell at the bottom of the oil-gas separation mechanism, and the clean gas outlet is used for the gas separated from the oil to flow out. There is a cavity between the oil-gas separation mechanism and the shell, and the cavity is connected to the clean gas outlet;

[0016] The inner cavity of the housing below the driving mechanism forms an oil collecting chamber, and the side wall of the oil collecting chamber is provided with an oil return port for the lubricating oil to flow out;

[0017] The oil-gas separation mechanism comprises a separation disc upper end cover connected to the upper part of the central shaft, a separation disc lower end cover connected to the lower part of the central shaft, and impact centrifugal separation discs connected to the central shaft between the separation disc upper end cover and the separation disc lower end cover;

[0018] The upper end cover of the separation disc, each impact centrifugal separation disc and the lower end cover of the separation disc all rotate integrally with the central shaft, and the upper end cover of the separation disc and each impact centrifugal separation disc all slide with the central shaft in the axial direction and are stacked on the lower end cover of the separation disc in sequence from top to bottom; the upper end cover of the separation disc, each impact centrifugal separation disc and the lower end cover of the separation disc are collectively referred to as an oil-gas separation member, and the protrusion forms a gap between adjacent oil-gas separation members, and the gap serves as an airflow passage;

[0019] An annular oil collecting groove is provided above the clean gas outlet along the inner wall of the shell, and the bottom of the annular oil collecting groove is connected to the oil collecting chamber through an oil passage;

[0020] The upper end cover and the lower end cover of the separation disc are both bowl-shaped structures. The upper end cover of the separation disc serves as the top of the oil-gas separation mechanism and is connected to the air inlet upward. The bottom of the bowl of the upper end cover of the separation disc has a through hole and is connected downward to the impact centrifugal separation disc below it.

[0021] The driving mechanism includes an impeller device connected to the bottom of the central shaft and an oil injection pipe installed on the housing, the oil injection pipe is used to connect to the high-pressure section in the lubricating oil circuit of the motor vehicle; the direction of the oil injection port at the end of the oil injection pipe deviates from the center line of the central shaft and faces the impeller device;

[0022] The impeller device comprises an upper impeller and a lower impeller, each of which comprises a body, a mounting hole penetrating from top to bottom is provided at the center of the body, and the body is mounted on the central axis through the mounting hole; a plurality of blades are evenly arranged around the central hole on the body, and the blades are used to withstand the pressure of the lubricating oil sprayed from the oil spray pipe and serve as a rotating power; two transmission holes or transmission keys are symmetrically arranged on the body of the upper impeller, and two transmission keys or transmission holes are symmetrically arranged on the body of the lower impeller, and the upper impeller and the lower impeller rotate as a whole through the plug-in cooperation of the transmission keys and the transmission holes;

[0023] A flat key adapted to the flat portion on the central shaft is arranged in the mounting hole of the lower impeller, and the lower impeller drives the central shaft to rotate via the flat key.

[0024] The present invention has the following advantages:

[0025] In the past, oil droplets and gas were separated only by the centrifugal effect generated by the rotation of the separation disc. Smaller oil droplets were difficult to separate from the gas due to their light weight and would flow out with the air flow. Larger oil droplets were easier to separate from the gas due to their heavy weight.

[0026] The present invention arranges the bowl side wall of the impact centrifugal separation disc into a truncated polygonal cone (the horizontal section of the bowl side wall is a regular polygon), so that small oil slurries in the blowby gas can easily be gathered and merged into large oil droplets due to impact on the edges. After the large oil slurries are thrown out of the separation disc under the centrifugal action, they are more likely to be gathered downward along the inner wall of the shell into the annular oil collection groove instead of flowing out of the clean gas outlet with the air flow.

[0027] In short, the present invention utilizes the dual effects of centrifugation and impact to improve the gas-oil separation efficiency and achieve a better gas-oil separation effect. On the one hand, the gas discharged to the outside is cleaner and more environmentally friendly, and on the other hand, more lubricating oil is recycled.

[0028] The driving mechanism has a simple structure, and uses the lubricating oil pressure of the motor vehicle as a power source, without the need for additional energy supply. The structure of the impeller device is convenient for installation and manufacturing, and can easily convert the oil pressure into power for driving the central shaft to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the active oil-gas separator of the present invention; Figure 1 The direction indicated by the arrow in the middle is the airflow direction;

[0030] Figure 2 is a schematic structural diagram of the impact centrifugal separation disc in the first embodiment;

[0031] Figure 3 is a schematic diagram of the structure of the impact centrifugal separation disc in the second embodiment;

[0032] Figure 4It is a schematic diagram of the structure of the upper impeller;

[0033] Figure 5 It is a structural diagram of the lower impeller. DETAILED DESCRIPTION

[0034] Embodiment 1

[0035] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the impact centrifugal separation disc of the present invention comprises a bowl body side wall 1 which is larger at the top and smaller at the bottom, and the bowl body side wall 1 is connected downwardly to a bowl bottom structure; the bowl bottom structure comprises a center ring 3 for driving connection with a center shaft 2 of an active oil-gas separator, and the center ring 3 is connected to a plurality of rib plates 4, and each rib plate 4 extends radially to the inner surface of the bowl body side wall 1 and is fixedly connected to the inner surface of the bowl body side wall 1; in the bowl bottom structure, the portion other than the center ring 3 and each rib plate 4 is a hollow structure;

[0036] The horizontal cross-section of the bowl body side wall 1 is a regular polygon with the number of sides being greater than or equal to 4, the corner of the regular polygon is located on the edge of the bowl body side wall 1, and the edge 5 of the bowl body side wall 1 is used to impact and adhere to the oil droplets in the blowby gas, so that the small oil droplets merge into large oil droplets at the edge 5;

[0037] A plurality of protrusions 6 protruding from the inner surface of the bowl body side wall 1 and used to form an airflow path are evenly distributed on the inner surface and / or outer surface of the bowl body side wall 1. Preferably, the protrusions 6 are arranged on both the inner surface and the outer surface of the bowl body side wall 1.

[0038] When in use, the impact centrifugal separation disc rotates continuously, and the crankcase blowby gas is thrown outward under the action of centrifugal force. In this process, small oil droplets in the blowby gas easily hit the edge 5 of the bowl side wall 1, and thus adhere to the edge 5; when multiple small oil droplets contact each other at the edge 5, they merge into large oil droplets. Large oil droplets are more easily separated from the blowby gas under the action of centrifugal force, and then the dual effects of impact and centrifugal force are used to significantly improve the efficiency of the separation disc in separating oil and gas.

[0039] The center ring 3 is a regular polygon; the horizontal section of the bowl body side wall 1 is a regular 36-gon.

[0040] The protrusion 6 is in the shape of an oblique rib or an arc rib, and the protrusion 6 corresponds to the rib plate 4 one by one and is connected as a whole.

[0041] The present invention also discloses an active oil-gas separator using the impact centrifugal separation disc, comprising a housing 7, a central shaft 2 is mounted in the housing 7 via an upper bearing 8 and a lower bearing 9, an oil-gas separation mechanism is provided at the middle and upper part of the central shaft 2, and a driving mechanism for driving the central shaft 2 to rotate is provided at the bottom of the central shaft 2;

[0042] The top of the housing 7 is provided with an air inlet 10 for communicating with the upper cover of the crankcase of the internal combustion engine to introduce blow-by gas, and the air inlet 10 is communicated with the top of the oil-gas separation mechanism;

[0043] A clean gas outlet 11 is provided on the side wall of the shell 7 at the bottom of the oil-gas separation mechanism. The clean gas outlet 11 is used to separate the gas from the oil. When in use, the clean gas outlet 11 is either connected to the exhaust gas pipeline of the motor vehicle through a pipeline, or connected to the air inlet of the turbocharger pump to utilize the exhaust gas. A cavity 12 is provided between the oil-gas separation mechanism and the shell 7, and the cavity 12 is connected to the clean gas outlet 11;

[0044] The inner cavity of the housing 7 below the driving mechanism forms an oil collecting chamber 13, and the side wall of the oil collecting chamber 13 is provided with an oil return port 27 for the lubricating oil to flow out. The oil return port 27 is connected to the upper part of the oil pan of the crankcase when in use.

[0045] The oil-gas separation mechanism includes a separation disc upper end cover 14 connected to the upper part of the central shaft 2 by injection molding or other processes, a separation disc lower end cover 15 connected to the lower part of the central shaft 2, and impact centrifugal separation discs 16 connected on the central shaft 2 between the separation disc upper end cover 14 and the separation disc lower end cover 15;

[0046] The separation disc upper end cover 14, each impact centrifugal separation disc 16 and the separation disc lower end cover 15 all rotate integrally with the central shaft 2, and the separation disc upper end cover 14 and each impact centrifugal separation disc 16 all slide with the central shaft 2 in the axial direction and are stacked on the separation disc lower end cover 15 in sequence from top to bottom; the separation disc upper end cover 14, each impact centrifugal separation disc 16 and the separation disc lower end cover 15 are collectively referred to as oil-gas separation parts, and the protrusion 6 forms a gap between adjacent oil-gas separation parts, and the gap is connected to the cavity 12 as an airflow passage;

[0047] The separation disc lower end cover 15 can be fixed on the central shaft 2 or supported downward on the lower bearing 9 by a spring.

[0048] An annular oil collecting groove 17 is provided along the inner wall of the shell 7 above the clean gas outlet 11, and the bottom of the annular oil collecting groove 17 is connected to the oil collecting chamber 13 through an oil path; the oil path preferably passes through the lower bearing 9 to lubricate the lower bearing 9.

[0049] The upper end cover 14 of the separation disc and the lower end cover 15 of the separation disc are both bowl-shaped structures. The upper end cover 14 of the separation disc serves as the top of the oil-gas separation mechanism and is connected to the air inlet 10 upward. The bottom of the bowl of the upper end cover 14 of the separation disc has a through hole and is connected downward to the impact centrifugal separation disc 16 below it.

[0050] The driving mechanism includes an impeller device connected to the bottom of the central shaft 2 and an oil injection pipe 18 installed on the housing 7, the oil injection pipe 18 is used to connect to the high-pressure section in the lubricating oil circuit of the motor vehicle; the direction of the oil injection port at the end of the oil injection pipe 18 deviates from the center line of the central shaft 2 and faces the impeller device;

[0051] The impeller device includes an upper impeller 19 and a lower impeller 20. Both the upper impeller 19 and the lower impeller 20 include a body 21. A mounting hole 22 that runs through the body 21 is provided at the center thereof. The body 21 is installed on the central shaft 2 through the mounting hole 22. A plurality of blades 23 are evenly arranged around the central hole on the body 21. The blades 23 are used to withstand the pressure of the lubricating oil sprayed from the oil spray pipe 18 and serve as a rotational power. Two transmission holes 24 or transmission keys 25 are symmetrically arranged on the body 21 of the upper impeller 19. Two transmission keys 25 or transmission holes 24 are symmetrically arranged on the body 21 of the lower impeller 20. The upper impeller 19 and the lower impeller 20 rotate as a whole through the plug-in cooperation of the transmission keys 25 and the transmission holes 24.

[0052] A flat key 26 adapted to the flat portion of the central shaft 2 is provided in the mounting hole 22 of the lower impeller 20 . The lower impeller 20 drives the central shaft 2 to rotate via the flat key 26 .

[0053] During operation, the air inlet 10 is connected to the upper cover of the crankcase of the internal combustion engine to introduce blowby gas; the clean gas outlet 11 is either connected to the exhaust gas exhaust pipeline of the motor vehicle through a pipeline, or connected to the air inlet 10 of the turbocharger pump to utilize the exhaust gas. The oil injection pipe 18 is connected to the high-pressure section in the lubricating oil circuit of the motor vehicle to introduce high-pressure lubricating oil as the power to drive the impeller device to rotate. The oil return port 27 is connected to the upper part of the oil pan of the crankcase to reuse the recovered lubricating oil.

[0054] During operation, the high-pressure lubricating oil drives the impeller device to rotate continuously, and the impeller device drives the central shaft 2 and the oil-gas separation mechanism to rotate. The crankcase blow-by gas enters the active oil-gas separator of the present invention from the air inlet 10, and then passes through the oil-gas separation mechanism from top to bottom, and centrifuges along the separation discs 16 at each impact centrifugal separation disc. Under the action of centrifugal force, the blow-by gas moves upward and outward along each impact centrifugal separation disc 16, and the oil slurry in the blow-by gas easily impacts and adheres to each edge 5 of the impact centrifugal separation disc 16, and the lubricating oil droplets at each edge 5 converge and merge into a large oil slurry, thereby improving the effect of oil-gas separation.

[0055] Embodiment 2

[0056] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that the raised portion 6 includes an upper and lower part, the lower raised portion 6 is connected to the ribs 4 on the inner surface of the bowl body side wall 1, and the upper raised portion 6 is a plurality of circular, square or elliptical protrusions.

[0057] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An impact centrifugal separation disc, comprising a bowl body side wall that is larger at the top and smaller at the bottom, and the bowl body side wall is connected downwardly to a bowl bottom structure; the characteristics are: The bowl bottom structure includes a center ring for driving connection with the center shaft of the active oil-gas separator, and the center ring is connected to a plurality of ribs, each of which extends to the inner surface of the side wall of the bowl body and is fixedly connected to the inner surface of the side wall of the bowl body; in the bowl bottom structure, the portion other than the center ring and each rib is a hollow structure; The horizontal cross-section of the bowl body side wall is a regular polygon with the number of sides being greater than or equal to 4. The edges of the bowl body side wall are used to impact and adhere to the oil droplets in the blow-by gas, so that the small oil droplets merge into large oil droplets at the edges; the large oil droplets move upward and radially outward and adhere to the inner wall of the active oil-gas separator housing and converge downward; A plurality of protrusions protruding from the inner surface of the side wall of the bowl body and used for forming an air flow passage are distributed on the inner surface and / or outer surface of the side wall of the bowl body.

2. The impact centrifugal separation disc according to claim 1, characterized in that: The center ring is a regular polygon; the horizontal section of the side wall of the bowl body is a regular 36-gon.

3. The impact centrifugal separation disc according to claim 1, characterized in that: The protrusion is in the shape of an oblique rib or an arc rib, and the protrusion corresponds to the rib plate one by one and is connected as a whole.

4. The impact centrifugal separation disc according to claim 1, characterized in that: The raised part comprises an upper and a lower part, wherein the lower raised part is the ribs connected to the inner surface of the side wall of the bowl body, and the upper raised part is a plurality of convex points.

5. An active oil-gas separator using the impact centrifugal separation disc according to any one of claims 1 to 4, comprising a housing, a central shaft is mounted in the housing through an upper bearing and a lower bearing, an oil-gas separation mechanism is provided at the middle and upper part of the central shaft, and a driving mechanism for driving the central shaft to rotate is provided at the bottom of the central shaft; The top of the housing is provided with an air inlet for communicating with the upper cover of the crankcase of the internal combustion engine to introduce blow-by gas, and the air inlet is communicated with the top of the oil-gas separation mechanism; A clean gas outlet is provided on the side wall of the shell at the bottom of the oil-gas separation mechanism, and the clean gas outlet is used for the gas separated from the oil to flow out. There is a cavity between the oil-gas separation mechanism and the shell, and the cavity is connected to the clean gas outlet; The inner cavity of the housing below the driving mechanism forms an oil collecting chamber, and the side wall of the oil collecting chamber is provided with an oil return port for the lubricating oil to flow out; Features: The oil-gas separation mechanism comprises a separation disc upper end cover connected to the upper part of the central shaft, a separation disc lower end cover connected to the lower part of the central shaft, and impact centrifugal separation discs connected to the central shaft between the separation disc upper end cover and the separation disc lower end cover; The separation disc upper end cover, each impact centrifugal separation disc and the separation disc lower end cover all rotate integrally with the central shaft, and the separation disc upper end cover and each impact centrifugal separation disc all slide with the central shaft in the axial direction and are stacked on the separation disc lower end cover in sequence from top to bottom; The separation disc upper end cover, each impact centrifugal separation disc and the separation disc lower end cover are collectively referred to as an oil-gas separation element, and the raised portion forms a gap between adjacent oil-gas separation elements, and the gap serves as an airflow passage; An annular oil collecting groove is provided above the clean gas outlet along the inner wall of the shell, and the bottom of the annular oil collecting groove is connected to the oil collecting chamber through an oil passage; The upper end cover and the lower end cover of the separation disc are both bowl-shaped structures. The upper end cover of the separation disc serves as the top of the oil-gas separation mechanism and is connected to the air inlet upward. The bottom of the bowl of the upper end cover of the separation disc has a through hole and is connected downward to the impact centrifugal separation disc below it.

6. The active oil-gas separator according to claim 5, characterized in that: The driving mechanism includes an impeller device connected to the bottom of the central shaft and an oil injection pipe installed on the housing, the oil injection pipe is used to connect to the high-pressure section in the lubricating oil circuit of the motor vehicle; the direction of the oil injection port at the end of the oil injection pipe deviates from the center line of the central shaft and faces the impeller device; The impeller device comprises an upper impeller and a lower impeller, each of which comprises a body, a mounting hole penetrating from top to bottom is provided at the center of the body, and the body is mounted on the central axis through the mounting hole; a plurality of blades are evenly arranged around the central hole on the body, and the blades are used to withstand the pressure of the lubricating oil sprayed from the oil spray pipe and serve as a rotating power; two transmission holes or transmission keys are symmetrically arranged on the body of the upper impeller, and two transmission keys or transmission holes are symmetrically arranged on the body of the lower impeller, and the upper impeller and the lower impeller rotate as a whole through the plug-in cooperation of the transmission keys and the transmission holes; A flat key adapted to the flat portion on the central shaft is arranged in the mounting hole of the lower impeller, and the lower impeller drives the central shaft to rotate via the flat key.

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