Two-stage impeller type electrically-driven active filtering type oil-gas separator and method

Abstract

The invention discloses a two-stage impeller type electrically-driven active filtering type oil-gas separator and a method. The oil-gas separator comprises a shell, a separation module and a PCV pressure regulating module, and the interior of the shell can be divided into an inner flow channel and a separation cavity; a boosting module is arranged in the inner flow channel and comprises two stages of impellers, namely a first-stage movable impeller and a second-stage static impeller, the first-stage movable impeller is used for increasing airflow power, and the second-stage static impeller is used for increasing airflow pressure; the separation module comprises separation cotton for separating liquid drops; and the PCV pressure adjusting module is arranged on the side face of the main body and used for adjusting the pressure in the front end area of the air inlet pipe, and it is guaranteed that the pressure in the area is within a reasonable range. The device is high in separation efficiency, reduces pollutant discharge, is wide in application range, can be suitable for a closed structure and an open structure, can actively adjust and control the pressure of the front end area of the air inlet pipe to be in a reasonable range in a large range, and effectively improves the comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the field of various forced ventilation systems, especially the forced ventilation system of the engine crankcase, and relates to a two-stage impeller type electrically driven active oil-gas separator and method. Background Art

[0002] The oil-gas separator is connected to the engine crankcase, the intake pipe and the air filter. Currently, almost all internal combustion engines work by inhaling a mixture of air and fuel, compressing it, and then igniting or compressing the mixture to drive the piston to do work and generate power. During the compression and combustion of the mixture, a very high pressure will be generated. The compressed gas will escape through the gaps between the piston and the cylinder block, the gaps between the piston rings and the cylinder block, etc. and enter the crankcase, forming crankcase blow-by. The main functions of the oil-gas separator are as follows: reducing the pollutant emissions of the engine. Before the blow-by gas is introduced into the combustion chamber for re-combustion, it is necessary to effectively separate the crankcase blow-by gas to minimize the amount of engine oil entering the combustion system and reduce the oil consumption. At the same time, it integrates the crankcase pressure regulation function to regulate the pressure inside the crankcase. Currently, as the core component of the crankcase ventilation system, the structure of the oil-gas separator is mostly maze type or collision type. Due to the low separation efficiency of these types of oil-gas separation technologies, it is difficult to meet the requirements of the closed crankcase ventilation system. Forced adoption will lead to problems such as reduced turbocharger efficiency, oil ingress into the intercooler, and abnormal oil consumption, and ultimately lead to a decline in the overall performance and reliability of the engine. Currently, some people also adopt an open filtration type solution, but this solution is likely to cause the pressure inside the engine crankcase to exceed the allowable range, and the replacement life of the filter element is not ideal enough.

[0003] The "active oil-gas separator" disclosed in the Chinese patent document with the publication number CN110500159A includes a housing. An oil-gas separation mechanism is provided between the upper middle part of the central shaft in the housing and the housing, and a driving mechanism for driving the central shaft to rotate is provided between the bottom of the central shaft and the housing; an air inlet for introducing the blow-by gas of the internal combustion engine is provided at the top of the housing, a clean gas outlet is provided on the side wall of the housing at the bottom of the oil-gas separation mechanism, and an oil return port for the lubricating oil to flow out is provided on the side wall of the housing below the driving mechanism; the oil-gas separation mechanism includes an upper end cover of the separation disc, a lower end cover of the separation disc, and each middle part separation disc connected to the central shaft between the upper end cover of the separation disc and the lower end cover of the separation disc; this invention automatically starts working after the motor vehicle is ignited and automatically stops working after the engine is turned off. The working process does not require electronic control, can efficiently separate the oil and gas in the engine blow-by gas, reduce the loss of lubricating oil, and can achieve long-term stable operation without maintenance, and has very high market value. However, the separation efficiency of the separation disc in this oil-gas separator for the blow-by gas is not high. Due to the inherent characteristics of the structure, this oil-gas separator cannot provide a good head, that is, the crankcase pressure may be relatively high, especially it can hardly be applied to the open type solution (that is, the solution with the air outlet directly discharging to the atmosphere). Summary of the Invention

[0004] The present invention aims to overcome the problem that the existing oil-gas separator has low separation efficiency and is difficult to meet the requirements of systems such as closed or open crankcase ventilation systems, and provides an electric-driven active filtering oil-gas separator with a two-stage impeller, which takes into account both high separation efficiency and the ability to actively control pressure.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an electric-driven active filtering oil-gas separator with a two-stage impeller, and the oil-gas separator includes:

[0007] The interior of the housing (1) is divided into an inner flow channel in the middle and a separation chamber (15) on the periphery. An inner flow channel wall is provided inside the housing (1) to divide the inner region of the housing into an inner flow channel in the middle and a separation chamber (15) on the periphery. The outlet of the inner flow channel communicates with the separation chamber, and a boosting module is arranged in the inner flow channel. An air inlet pipe is arranged at the upper end of the inner flow channel and communicates with the inner flow channel. The boosting module includes a first-stage moving blade (2) for accelerating the air flow and a second-stage stationary blade (12) for converting the kinetic energy provided by the moving blade (2) to the air flow into pressure energy. The stationary blade is fixed on the inner flow channel wall. The blow-by air flow enters the inner flow channel from the air inlet pipe, successively passes through the moving blade (2) and the stationary blade (12), and forms a high-pressure air flow. A lower end plate (7) hermetically connected to the housing is further provided at the lower end of the housing (1);

[0008] A separation module, the separation module includes separation cotton (3). The separation cotton (3) is a porous medium with oil repellency and is arranged in the separation chamber (15) as a fine filtration structure. Its upper end contacts the upper end of the housing (1), and its lower end contacts the lower end plate (7), dividing the separation chamber (15) into two parts inside and outside. The separation cotton (3) is used for condensing and adsorbing oil droplets in the air flow around the boosting module;

[0009] The PCV pressure regulating module (5) includes a PCV valve, an air outlet pipe, and a PCV valve cavity. The PCV valve cavity communicates with the air outlet pipe through the PCV valve, and the separation chamber outside the separation cotton (3) communicates with the PCV valve cavity. When the vacuum degree in the PCV valve cavity exceeds the set threshold, the PCV valve deforms to narrow the channel between the PCV valve cavity and the air outlet pipe; otherwise, the PCV valve remains open.

[0010] Furthermore, an oil storage cavity (8) for collecting and storing the separated oil droplets is further provided at the bottom of the housing (1). A plurality of main oil return holes (13) are arranged on the upper surface of the oil storage cavity (8), and an oil return pipe (9) is arranged below. The oil in the separation chamber (15) enters the oil storage cavity (8) through the main oil return holes (13), and the accumulated oil in the oil storage cavity (8) is discharged from the oil-gas separator through the oil return pipe (9);

[0011] The oil return pipe (9) is also provided with a one-way valve (10) to discharge oil from the oil-gas separator unidirectionally.

[0012] Furthermore, the oil-gas separator further includes a driving module (4). The driving module (4) includes a driving motor (4) and a driving shaft connected to the moving blade (2) for driving the moving blade (2) to rotate. The driving module (4) is fixed to the housing (1) through a flange, and heat sinks are arranged on the top of the driving module (4). The output rotation speed of the driving module (4) is adjustable.

[0013] Furthermore, the center of the lower end plate (7) protrudes upward, and a coarse filtration structure is provided on the inclined surface of the protrusion. The coarse filtration structure is a structure in which columnar units are distributed on a conical surface, and the columnar units are arranged at a certain interval. The separation cotton (3) is oil-repellent fiber cotton.

[0014] Furthermore, the oil-gas separator further includes a portable disassembly and assembly module (6). The portable disassembly and assembly module (6) is a hoop-type locking device for separating and sealingly combining the upper and lower parts of the housing.

[0015] Furthermore, an oil return hole (11) of the PCV pressure regulating module is provided at the lowest edge of the PCV valve cavity and is connected to the separation cavity (15) to return the oil accumulated in the PCV valve cavity to the housing (1).

[0016] Furthermore, a plurality of ventilation holes (14) are circumferentially arranged at the upper end of the housing. The air flow separated by the separation cotton (3) passes upward through the ventilation holes (14) and enters the PCV pressure regulating module (5).

[0017] Furthermore, the oil-gas separator further includes a bypass valve module (16). The bypass valve module (16) is located at the center of the lower end plate (7) and is used to control the connection between the internal cavity of the housing and the oil storage cavity to prevent the pressure of the equipment connected to the front end of the intake pipe from being too high.

[0018] Furthermore, the bypass valve module (16) consists of a regulating valve and a regulating spring, and the regulating spring is used to automatically close the regulating valve.

[0019] Furthermore, the bypass valve module (16) is opened in the special situation where the separation cotton (3) freezes or becomes blocked, and automatically closes after the freezing or blocking phenomenon disappears.

[0020] The present invention also proposes an oil-gas separation method according to the above-mentioned two-stage impeller type electric drive active filtering oil-gas separator, including:

[0021] The blow-by gas flows through the intake pipe into the internal flow path. The driving module (4) drives the moving blade (2) of the boosting module to rotate at high speed, increasing the kinetic energy of the gas flow. Subsequently, the gas flow enters the region of the stationary blade (12), and the stationary blade (12) converts the kinetic energy into pressure energy, increasing the pressure of the gas flow.

[0022] After leaving the stationary blade (12), the gas flow still retains a certain rotation. The oil droplets in the gas flow flow to the separation cotton (3) and seep out to the peripheral part of the separation chamber; the gas flow passes through the separation cotton (3), and the remaining droplets in the gas flow are separated due to the adsorption effect and also gather in the peripheral part of the separation chamber.

[0023] The oil in the peripheral part of the separation chamber flows downward and flows out through the oil return hole (13).

[0024] The gas flow after passing through the separation cotton (3) moves upward in the peripheral part of the separation chamber and leaves the oil-gas separator through the PCV pressure regulating module (5).

[0025] The oil-gas separator can also actively control the pressure by increasing the rotation speed of the moving blade (2) and reducing the air pressure at the front end of the intake pipe.

[0026] The present invention can be applied to the separation of oil droplets and gas in the engine crankcase blow-by; more generally, the present invention is also applicable to various scenarios where pollutants need to be separated from the air, and the form of the pollutants can be liquid droplets or liquid droplets containing solid particles.

[0027] Therefore, the present invention has the following remarkable effects:

[0028] (1) High separation efficiency, reducing oil consumption and improving emission performance. The oil-gas separator of the present invention can achieve a separation efficiency of more than 98%.

[0029] (2) It can be applied to open and closed schemes. Due to the presence of a boosting device, the oil-gas separator scheme of the present invention is applicable to both closed and open schemes, and can also ensure that the air pressure at the front end of the intake pipe is within a reasonable range in the open scheme.

[0030] (3) It can actively control the pressure in the front-end region of the intake pipe within a wide range of pressures. By replacing the PCV valve springs with different lengths and elastic moduli, the pressure at the front end of the intake pipe can be in different ranges, such as in the pressure range of -2 kPa to +2 kPa, or -1 kPa to +1 kPa, or -3 kPa to +3 kPa.

[0031] (4) A bypass valve module is arranged in the separation chamber to effectively prevent abnormal pressure in the intake pipe. When extreme situations occur, the bypass valve module can open when the pressure is too high, playing a role in relieving and limiting pressure to ensure that the oil-gas separator structure of the present invention does not damage the front-end equipment;

[0032] (5) It can effectively ensure that the separated oil is discharged from the oil-gas separator and at the same time prevent the backflow of the escaping gas into the oil-gas separator. An oil storage chamber and a check valve are provided. The accumulated oil can be discharged from the oil-gas separator through the check valve, and at the same time, the gas in the front-end area of the intake pipe cannot enter the oil-gas separator through the check valve;

[0033] (6) It can complete the replacement of the separation module conveniently and reliably. After replacing the filter element of the oil-gas separation of the present invention, it can be used multiple times, which is economical and environmentally friendly. A portable disassembly and assembly module is provided, which can quickly and reliably disassemble the oil-gas separator housing and replace the filter element. Brief Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of a two-stage impeller type electric drive active filtering oil-gas separator according to an embodiment of the present invention;

[0035] Figure 2 is a front view of a two-stage impeller type electric drive active filtering oil-gas separator according to an embodiment of the present invention;

[0036] Figure 3 is a top view of a two-stage impeller type electric drive active filtering oil-gas separator according to an embodiment of the present invention;

[0037] Figure 4 is a bottom view of a two-stage impeller type electric drive active filtering oil-gas separator according to an embodiment of the present invention;

[0038] Figure 5 is the lower end plate of a two-stage impeller type electric drive active filtering oil-gas separator according to an embodiment of the present invention.

[0039] In the figure: 1. Housing 2. Moving blade 3. Separation cotton 4. Driving module 5. PCV pressure regulating module 6. Portable disassembly and assembly module 7. Lower end plate 8. Oil storage chamber 9. Oil return pipeline 10. Check valve 11. PCV pressure regulating module oil return hole 12. Static blade 13. Main oil return hole 14. Ventilation hole 15. Separation chamber 16. Bypass valve module 17. Mounting bracket 18. Intake pipe. Detailed Embodiments

[0040] The present invention will be further described and explained below in conjunction with the specific embodiments. The embodiments are only demonstrations of the content of the present disclosure and do not delimit the scope of limitation. Without conflict, the technical features of each embodiment of the present invention can be combined accordingly.

[0041] Example 1:

[0042] As shown in the Figures 1-4 Example 1 shown, an active motor-driven oil-gas separator includes a housing 1. A boosting module and a separation chamber 15 are arranged inside the housing 1. An oil storage chamber 8 is also arranged at the bottom of the housing 1. The oil storage chamber 8 and the separation chamber 15 are connected through a plurality of main oil return holes 13; The first-stage moving vane 2 and the second-stage static vane 12 in the boosting module are used in cooperation to significantly increase the pressure of the gas; The separation module 3 separates the oil droplets and gas in the air flow; The driving module 4, the driving module 4 is used to connect the moving boosting module through a central shaft to make the vane 2 rotate at high speed. The driving module 4 includes a motor, a driving shaft connected to the moving vane 2, a motor control assembly as an adjusting device, and a heat dissipation structure; The PCV valve pressure regulating module, the PCV valve pressure regulating module includes a PCV valve, an air outlet pipe and a PCV valve cavity, and is used to adjust the balance between the crankcase pressure and the atmospheric pressure.

[0043] A lower end plate is also arranged at the lower end of the housing 1. As Figure 5 shown, the center of the lower end plate is convex in a frustum shape; A coarse filtration structure is arranged on the slope of the convex part of the lower end plate. The coarse filtration structure is a structure with columnar units distributed on a conical surface, and the columnar units are arranged at a certain interval. The setting of the coarse filtration structure can capture large particles in time, so that the liquid droplets are in the lower area of the separation module, keeping the upper area of the separation module clean and extending the service life.

[0044] In this technical solution, when the blow-by gas enters the housing 1 through the intake pipe 18, the motor control assembly drives the motor and the driving shaft to rotate. The driving shaft is connected to the moving vane 2 in the boosting module to drive the moving vane 2 to rotate. Under the action of the high-speed rotating moving vane, an inlet negative pressure is formed, so as to suck the engine blow-by gas into the moving vane 2. Due to the centrifugal acceleration effect, the kinetic energy of the high-speed rotating air flow is greatly increased. After the air flow passes through the static vane 12 in the boosting module, the fluid kinetic energy is converted into pressure energy. After the fluid leaves the static vane 12, the pressure of the gas can be significantly increased. At the same time, the high-speed rotating air flow can throw most of the larger liquid droplets in the air flow to the surrounding wall surfaces to complete the separation of the coarse liquid droplets; The large liquid droplets entrained in the air flow are separated in the coarse filtration device of the lower end plate 7; The very fine liquid droplets in the air flow are separated by the separation module 3 in the separation chamber 15; The separated liquid flows downward through the main oil return holes 13 and is collected in the oil storage chamber 8, and then flows back to the oil pan through the oil return pipe 9 and the one-way valve 10;

[0045] The clean air after separation then enters above the housing 1 through the vent hole 14 and is discharged from the oil-gas separator through the PCV pressure regulating module 5, enters the engine intake pipe, intake manifold or is directly discharged to the atmosphere; After passing through the oil-gas separator, the oil droplet content in the blow-by gas is significantly reduced, thereby reducing the oil consumption;

[0046] In addition, under relatively harsh working conditions, the amount of blow-by gas is very large, the pressure in the front area of the intake pipe increases, and the drive module 4 can drive the boost module to increase the rotational speed, so as to maintain the pressure in the front area of the intake pipe and achieve the effect of actively controlling the pressure in the front area of the intake pipe.

[0047] It should be noted that the present invention is also applicable to various scenarios where pollutants need to be separated from the air. The form of the pollutants can be liquid droplets or liquid droplets containing solid particles, and the connection between the intake pipe and the outlet pipe and the outside can also be changed according to needs.

[0048] In this embodiment, a perforation 11 is arranged at the lowest edge of the PCV valve cavity and connected to the separation cavity 15, so that the liquid droplets that may accumulate in the PCV valve flow back to the separation cavity 15, and finally enter the oil storage cavity 8 through the main oil return hole 13, and are discharged from the oil-gas separator through the oil return pipe 9 and the check valve 10.

[0049] The arrangement of the oil storage cavity, the oil return pipe and the check valve enables the separated oil to be stored in the oil storage cavity for a long time and flow back to the oil pan from the check valve when the blow-by gas is small. At the same time, it can prevent the blow-by gas from bypassing the separation module through the oil return pipe and escaping directly through the separation cavity and the PCV pressure regulating module.

[0050] The separation cotton 3 of the separation module is of a cylindrical structure, arranged longitudinally, and the longitudinal height is as large as possible. In this embodiment, the longitudinal height of the separation cotton is XX. The cylindrical structure is the simplest for the production process of the separation cotton 3. The longitudinal arrangement and the as-high-as-possible height can keep the upper part of the separation cotton 3 clean. The side surface of the upper half of the separation cotton 3 is limited by the inner flow path wall surface, so that some of the air flow leaves through the lower half of the separation cotton 3, and only when the air flow is very large or there is a local blockage in the lower half of the separation cotton will it pass through the upper half of the separation cotton. Such a design can increase the service life of the separation cotton 3. After passing through the separation cotton 3, the gas moves upward and the separated liquid moves downward, further completing the diversion of the liquid and the gas and improving the separation efficiency.

[0051] The separation cotton 3 is made of carbon fiber cotton with extremely good oil repellency. By selecting the appropriate wire diameter, porosity and overall thickness of the fiber cotton, higher separation efficiency and lower pressure drop can be achieved.

[0052] The PCV valve pressure regulating module includes a PCV valve, an outlet pipe and a PCV valve cavity, and is used to adjust the balance between the gas pressure in the front end of the intake pipe and the atmospheric pressure; the PCV valve is composed of a PCV valve diaphragm, a PCV valve spring and a PCV valve cover.

[0053] The gas outlet of the oil-gas separator may be connected to a structure similar to an engine intake pipe or an engine intake manifold. The absolute pressure is within a large range, possibly a very low negative pressure, which may exceed the allowable pressure in the intake pipe area. If the too low negative pressure is conducted to the front end of the intake pipe, it will cause adverse effects on some components or functions. The function of the PCV valve module is to adjust the pressure in the separation chamber to always be within a reasonable range, or rather, the difference between the pressure in the separation chamber and the atmospheric pressure is always within a reasonable range. When the vacuum degree at the gas outlet is not high, the PCV valve spring presses against the PCV valve diaphragm to keep the channel unobstructed; when the vacuum degree at the gas outlet exceeds a certain threshold value, the PCV valve diaphragm is sucked, compressing the spring and reducing the area of the fluid channel, so that the pressure in the separation chamber will not be too low. The size of the threshold value can be adjusted by the spring of the PCV valve, and the size of the threshold value is set according to the allowable pressure in the intake pipe.

[0054] After a relatively long operation time, some droplets may accumulate in the lower area of the PCV valve body. If there is no way to discharge them, the normal operation of the PCV valve will surely be affected. Therefore, a hole with a suitable size is opened on the wall surface of the lowest part of the PCV valve cavity close to the separation chamber, that is, the oil return hole 11 of the PCV pressure regulating module, so that the accumulated oil can flow back to the separation chamber in time and reach the oil storage chamber through the main oil return hole 13. The size of this hole is very crucial. If it is too large, some oil may reach the PCV valve cavity with the air flow, reducing the separation efficiency. If it is too small, the oil return will not be timely. In this embodiment, the oil return hole of the PCV pressure regulating module is a round hole with a diameter of 1-5 mm. The oil return hole of the PCV pressure regulating module can also be a hole with other shapes.

[0055] The driving module 4 is arranged at the top, and a heat sink is arranged in the top area of the driving module for easy heat dissipation. The structure is stable. The driving module 4 is installed on the shell through a circular O-ring to maintain sealing.

[0056] The portable disassembly and assembly module 6 includes a stainless steel clamp, a locking device and an O-ring. Through the portable disassembly and assembly module, the separation module can be replaced very conveniently, and good sealing and the stability of the shell structure can be maintained.

[0057] Embodiment 2:

[0058] The technical solution of Embodiment 2 is basically the same as that of Embodiment 1, and the difference lies in that: a bypass valve module 16, including a bypass valve and a control spring, is also arranged on the lower end plate 7 of the separation chamber 15 and installed on the lower end plate 7; when the separation module 3 freezes or is blocked, this will cause abnormal pressure in the equipment connected to the front end of the intake pipe. The setting of the bypass valve module enables the front end of the intake pipe to maintain a reasonable pressure, avoiding abnormal increase in the pressure in the equipment connected to the front end of the intake pipe. After the ice formation or blockage phenomenon is alleviated, the bypass valve module will automatically close again to ensure that the separation efficiency is at a high level.

[0059] After testing, the separation efficiency of Embodiments 1 and 2 of the present invention can reach 98%.

[0060] It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the above description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0061] The above embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A two-stage impeller type electric drive active oil-gas separator, characterized in that, The oil-gas separator includes: a housing (1), a separation module, and a PCV pressure regulating module (5); The interior of the housing (1) is divided into an inner flow channel in the middle and a separation chamber (15) on the periphery. An inner flow channel wall is provided inside the housing (1) to divide the area inside the housing into the inner flow channel in the middle and the separation chamber (15) on the periphery. The outlet of the inner flow channel communicates with the separation chamber. A pressure boosting module is provided in the inner flow channel, and an intake pipe is provided at the upper end of the inner flow channel and communicates with the inner flow channel. The pressure boosting module includes a first-stage moving blade (2) for accelerating the air flow and a second-stage stationary blade (12) for converting the kinetic energy provided by the moving blade (2) to the air flow into pressure energy. The stationary blade is fixed on the inner flow channel wall. The blow-by air flow enters the inner flow channel from the intake pipe, passes through the moving blade (2) and the stationary blade (12) in sequence, and forms a high-pressure air flow. A lower end plate (7) hermetically connected to the housing is also provided at the lower end of the housing (1); The separation module includes separation cotton (3). The separation cotton (3) is an oil-repellent porous medium and is provided as a fine filtration structure in the separation chamber (15). Its upper end contacts the upper end of the housing (1), and its lower end contacts the lower end plate (7), dividing the separation chamber (15) into two parts inside and outside. The separation cotton (3) is used for condensing and adsorbing oil droplets in the air flow at the outlet of the inner flow channel; The PCV pressure regulating module (5) includes a PCV valve, an outlet pipe, and a PCV valve cavity. The PCV valve cavity communicates with the outlet pipe through the PCV valve. The separation chamber outside the separation cotton (3) communicates with the PCV valve cavity; when the vacuum degree in the PCV valve cavity exceeds a set threshold, the PCV valve deforms to narrow the channel between the PCV valve cavity and the outlet pipe; otherwise, the PCV valve remains open.

2. The secondary impeller type electric drive active oil-gas separator according to claim 1, characterized in that, A storage cavity (8) for collecting and storing the separated oil droplets is also provided at the bottom of the housing (1). A plurality of main oil return holes (13) are provided on the upper surface of the storage cavity (8), and an oil return pipe (9) is provided below. The oil in the separation chamber (15) enters the storage cavity (8) through the main oil return holes (13), and the accumulated oil in the storage cavity (8) is discharged from the oil-gas separator through the oil return pipe (9); A check valve (10) is also provided on the oil return pipe (9) to enable the oil to be discharged from the oil-gas separator unidirectionally.

3. The secondary impeller type electric drive active oil-gas separator according to claim 1, characterized in that, The oil-gas separator further includes a drive module (4). The drive module (4) includes a drive motor (4) and a drive shaft connected to the moving blade (2) for driving the moving blade (2) to rotate; the drive module (4) is fixed to the housing (1) through a flange, and heat sinks are arranged on the top of the drive module (4); the output rotation speed of the drive module (4) is adjustable.

4. The two-stage impeller type electric drive active oil-gas separator according to claim 1, characterized in that, The center of the lower end plate (7) protrudes upward, and a coarse filtration structure is provided on the inclined surface of the protrusion. The coarse filtration structure is a structure with columnar units distributed on a conical surface, and the columnar units are arranged at a certain interval; the separation cotton (3) is oil-repellent fiber cotton.

5. The secondary impeller type electric drive active oil-gas separator according to claim 1, characterized in that, The oil-gas separator further includes a portable disassembly and assembly module (6). The portable disassembly and assembly module (6) is a hoop-type locking device for separating and hermetically combining the upper and lower parts of the housing.

6. The two-stage impeller type electric drive active oil-gas separator according to claim 1, characterized in that, At the lowest edge of the PCV valve cavity, there is an oil return hole (11) of the PCV pressure regulating module connected to the separation cavity (15) to return the oil accumulated in the PCV valve cavity to the housing (1).

7. The two-stage impeller type electrically-driven active oil-gas separator according to claim 1, characterized in that, A number of vent holes (14) are circumferentially arranged at the upper end of the housing. The airflow separated by the separation cotton (3) passes upward through the vent holes (14) and enters the PCV pressure regulating module (5).

8. The two-stage impeller type electrically-driven active oil-gas separator according to claim 1, characterized in that, The oil-gas separator further includes a bypass valve module (16). The bypass valve module (16) is located at the center of the lower end plate (7) and is used to control the connection between the internal cavity of the housing and the oil storage cavity. The bypass valve module (16) consists of a regulating valve and a regulating spring, and the regulating spring is used to automatically close the regulating valve.

9. The secondary impeller type electrically driven active oil-gas separator according to claim 8, characterized in that, The bypass valve module (16) opens in the special situation where the separation cotton (3) freezes or becomes blocked, and automatically closes after the freezing or blocking phenomenon disappears.

10. A method for separating oil and gas of the electric-driven active filtration type oil and gas separator with a two-stage impeller type according to claim 1, characterized in that, Including: The blow-by airflow enters the inner flow path through the intake pipe. The driving module (4) drives the moving blade (2) of the boosting module to rotate at a high speed, increasing the kinetic energy of the airflow. Subsequently, the airflow enters the area of the stationary blade (12), and the stationary blade (12) converts the kinetic energy into pressure energy to increase the pressure of the airflow. After leaving the stationary blade (12), the airflow still retains a certain rotation. The oil droplets in the airflow flow to the separation cotton (3) and seep out to the peripheral part of the separation cavity. The airflow passes through the separation cotton (3), and the remaining droplets in the airflow are separated due to the adsorption effect and also gather in the peripheral part of the separation cavity. The oil in the peripheral part of the separation cavity flows downward and flows out through the oil return hole (13). The airflow after passing through the separation cotton (3) moves upward in the peripheral part of the separation cavity and leaves the oil-gas separator through the PCV pressure regulating module (5). The oil-gas separator can also actively control the pressure by increasing the rotation speed of the moving blade (2) and reducing the air pressure at the front end of the intake pipe.

Images