Oil displacement type efficient multi-stage integrated oil-gas separator

Abstract

The utility model discloses an oil drive type efficient multi-stage integrated oil-gas separator which comprises a base, and the base is upwards connected with a first-stage filtering shell and a second-stage filtering shell. The base is downwards concaved to be provided with an oil cavity, an active oil drive type oil-gas separation structure is arranged in the first-stage filter shell, the top of the first-stage filter shell is connected with a gas inlet used for introducing blow-by gas of a crankcase, and the first-stage filter shell is downwards communicated with the oil cavity; an oil outlet through which oil flows back into the crankcase is formed in the lowest position of the oil cavity; the bottom of the primary filter shell is connected with a breather pipe; a filter element is arranged in the secondary filter shell, a purified gas outlet is formed in the top of the secondary filter shell, and the purified gas outlet is communicated with a gas outlet part of the filter element; the air inlet part of the filter element is connected with an air inlet cavity; and the breather pipe extends into the secondary filter shell and is communicated with the air inlet cavity. According to the oil-gas separation device, blow-by gas is subjected to two-stage separation through the separation disc and the filter element, the separation efficiency of the oil-gas separation device is remarkably improved, the emission PN is greatly reduced, and the emission regulation requirements of an open crankcase ventilation system are met.

Description

Technical Field

[0001] The utility model relates to an oil-gas separator for an internal combustion engine. Background Art

[0002] When the engine is working, the high-pressure gas in the combustion chamber leaks into the crankcase through the gap between the piston and the cylinder, generating blowby. Blowby contains impurities such as combustion exhaust gas and engine oil. If the blowby is not discharged for a long time, it will cause the crankcase pressure to rise, damage the seals and cause engine leakage, accelerate the oxidation and deterioration of the engine oil, accelerate the wear of engine parts, increase the oil consumption, etc., and affect the engine performance. Therefore, crankcase ventilation is required to discharge the blowby. Depending on whether the crankcase blowby is discharged to the atmosphere or connected to the intake pipe to participate in combustion, it can be divided into open crankcase ventilation and closed crankcase ventilation.

[0003] The open type directly discharges into the atmosphere will pollute the environment, while the closed type will pollute the intake system components such as the supercharger and intercooler and affect their service life. Both methods require an oil-gas separation device to separate and collect impurities in the mixed gas.

[0004] As automobile emission regulations become increasingly stringent, crankcase emissions are required to be tested together with exhaust emissions, which increases the difficulty of passing emissions. The emission PN value (the number of solid particulate matter in vehicle exhaust emissions) requirements have brought new challenges to the open crankcase ventilation system.

[0005] This scheme proposes a highly efficient integrated oil-gas separation method and device, which drives the separation disc to rotate at high speed by engine oil to perform a primary oil-gas separation (also the main oil-gas separation) on the crankcase gas, and then uses an integrated filter element structure to perform a secondary oil-gas separation on the gas, thereby achieving highly efficient separation of crankcase blowby gas and significantly reducing the emission PN value. Utility Model Content

[0006] The purpose of the utility model is to provide an oil-driven high-efficiency multi-stage integrated oil-gas separator, which greatly improves the oil-gas separation efficiency by connecting a first-stage active oil-driven oil-gas separation and a second-stage filtering oil-gas separation in series, and meets the increasingly stringent exhaust emission requirements.

[0007] To achieve the above purpose, the utility model of the oil-driven high-efficiency multi-stage integrated oil-gas separator comprises a base, the base is upwardly connected with a primary filter housing and a secondary filter housing, the primary filter housing and the secondary filter housing are arranged side by side at intervals;

[0008] The base is concave downwardly corresponding to the first-stage filter housing and is provided with an oil chamber. An upper bearing and a lower bearing are arranged in the first-stage filter housing in a relative manner. The upper bearing and the lower bearing are connected to the first-stage filter housing through a connecting frame. A main shaft is installed between the upper bearing and the lower bearing. The main shaft extends downward into the oil chamber and is connected to an impeller.

[0009] The main shaft is connected to a plurality of separation discs, each of which is arranged at intervals up and down and is used to separate oil and gas during rotation;

[0010] The side wall of the oil chamber is provided with an oil spray nozzle, which is used to connect to the high-pressure part of the motor vehicle lubricating oil circuit and introduce high-pressure lubricating oil externally, and to spray the high-pressure lubricating oil on the impeller to drive the main shaft to rotate internally;

[0011] The top of the primary filter housing is connected with an air inlet for introducing crankcase blowby gas, and the air inlet is used to guide the crankcase blowby gas downward to each separation disc;

[0012] The first-stage filter housing is downwardly connected to the oil chamber; an oil outlet is provided at the lowest point of the oil chamber for the oil to flow back into the crankcase;

[0013] A vent pipe is connected to the bottom of the primary filter housing;

[0014] A filter element is arranged in the secondary filter housing, and a clean air outlet is arranged on the top of the secondary filter housing, which is connected to the air outlet part of the filter element; the air inlet part of the filter element is connected to the air inlet cavity, and the ventilation pipe extends into the secondary filter housing and is connected to the air inlet cavity.

[0015] An oil collecting groove is arranged at the bottom of the primary filter housing along the circumferential direction, and the oil collecting groove is communicated with the oil cavity downward.

[0016] An oil return pipe is provided on the lower surface of the base. The air intake chamber is connected to the oil return pipe downward through an oil drop hole provided on the base. The oil return pipe is connected to the top of the oil chamber and is used to return the oil blocked by the secondary filter housing into the oil chamber.

[0017] The filter element is a cylindrical filter element, including an upper end cover and a lower end cover, a cylindrical frame is connected between the upper end cover and the lower end cover, and a cylindrical filter layer is connected to the outside of the cylindrical frame; the cylindrical frame and the cylindrical filter layer surround a central hole, and the central hole serves as the air inlet part of the filter element and is downwardly connected to the air inlet cavity; a clean air cavity is provided between the cylindrical filter layer and the outer wall of the secondary filter shell, and the circumferential surface of the cylindrical filter layer serves as the air outlet part of the filter element, and the clean air cavity is connected to the clean air outlet.

[0018] The ventilation pipe is communicated with the air inlet cavity along a tangential direction.

[0019] The utility model has the following advantages:

[0020] The utility model integrates an active centrifugal oil-gas separation structure and a filtering separation structure in series for the first time, adopts active centrifugal oil-gas separation as a primary separation structure and filtering oil-gas separation as a secondary separation structure to form a two-stage separation structure.

[0021] Crankcase blowby gas enters the first-stage active centrifugal oil-gas separation unit (first-stage filter housing) from the air intake, and most of the oil particle impurities are separated by each separation disc. Then a small amount of oil particles enter (secondary filter housing) for further separation, aiming to significantly reduce the PN value in the oil and gas and meet the emission regulations of the engine open crankcase ventilation system.

[0022] In the utility model, the blowby gas is separated in two stages through the separation disc and the filter element, which significantly improves the separation efficiency of the oil-gas separation device, greatly reduces the emission PN, and meets the emission regulations of the open crankcase ventilation system.

[0023] If only a filter element filtration structure is provided without a primary filter housing, the maintenance and replacement frequency of the filter element is too high, and the user experience is poor. Most of the oil particles and impurities are separated by the primary active centrifugal separation unit (primary filter housing and its internal separation discs and other structures), thereby reducing the burden of filter element filtration, extending the service life of the filter element, reducing the number of maintenance times, and improving the user experience.

[0024] The oil collection tank collects the oil flowing upward along the inner wall of the primary filter housing and then guides it into the oil cavity. The setting of the oil return pipe makes it unnecessary to clean the oil filtered by the filter element regularly, and it can naturally flow into the oil cavity along the oil return pipe, saving maintenance costs. The filter element has a simple structure and is easy to install and use.

[0025] The ventilation pipe is connected with the air inlet cavity along the tangential direction, and a vortex that flows along the wall can be formed in the air inlet cavity, so as to utilize this vortex to achieve a cyclonic centrifugal oil-liquid separation effect and improve the oil-gas separation effect; that is, the oil in the air flow is retained by the wall of the air inlet cavity and flows downward, and the air flow flows to the filter element along the inherent gas passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0027] Figure 2 It is a structural schematic diagram of the utility model.

[0028] Figure 3 yes Figure 2 CC cross-sectional view.

[0029] Figure 4 yes Figure 2 Bottom view of .

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure of the utility model in the rearward direction after the base is removed.

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the base. DETAILED DESCRIPTION

[0032] like Figures 1 to 6 As shown, the oil-driven high-efficiency multi-stage integrated oil-gas separator of the utility model comprises a base 1, the base 1 is upwardly connected with a primary filter housing 2 and a secondary filter housing 3, and the primary filter housing 2 and the secondary filter housing 3 are arranged side by side at intervals;

[0033] The base 1 is recessed downwards corresponding to the primary filter housing 2 and is provided with an oil chamber 4. An upper bearing 5 and a lower bearing 6 are arranged in the primary filter housing 2 in a relative manner. The upper bearing 5 and the lower bearing 6 are connected to the primary filter housing 2 through a connecting frame. A main shaft 7 is installed between the upper bearing 5 and the lower bearing 6. The main shaft 7 extends downwards into the oil chamber 4 and is connected to an impeller 8.

[0034] The main shaft 7 is connected to a plurality of separation discs 9, each of which is arranged at intervals up and down and is used to separate oil and gas during rotation;

[0035] The side wall of the oil chamber 4 is provided with an oil spray nozzle 10, which is used to connect to the high-pressure part of the lubricating oil circuit of the motor vehicle and introduce high-pressure lubricating oil externally, and is used to spray the high-pressure lubricating oil on the impeller 8 to drive the main shaft 7 to rotate internally;

[0036] The top of the primary filter housing 2 is connected with an air inlet 11 for introducing crankcase blowby gas, and the air inlet 11 is used to guide the crankcase blowby gas downward to each separation disc 9;

[0037] The primary filter housing 2 is downwardly connected to the oil chamber 4; the lowest part of the oil chamber 4 is provided with an oil outlet 12 for the oil to flow back into the crankcase;

[0038] A vent pipe 13 is connected to the bottom of the primary filter housing 2;

[0039] A filter element is provided in the secondary filter housing 3, and a clean air outlet 14 is provided on the top of the secondary filter housing 3, which is connected to the air outlet part of the filter element; the air inlet part of the filter element is connected to the air inlet cavity 15, and the ventilation pipe 13 extends into the secondary filter housing 3 and is connected to the air inlet cavity 15.

[0040] An oil collecting groove 16 is provided at the bottom of the primary filter housing 2 along the circumferential direction, and the oil collecting groove 16 communicates downward with the oil chamber 4. The oil collecting groove 16 conveniently collects the oil flowing upward along the inner wall of the primary filter housing 2, and then introduces it into the oil chamber 4. The oil passage between the oil collecting groove 16 and the oil chamber 4 preferably passes through the lower bearing 6, so as to continuously lubricate the lower bearing 6 during operation.

[0041] An oil return pipe 17 is provided on the lower surface of the base 1, and the air inlet chamber 15 is downwardly connected to the oil return pipe 17 through an oil drop hole 18 provided on the base 1. The oil return pipe 17 is connected to the top of the oil chamber 4 and is used to allow the oil blocked by the secondary filter housing 3 to flow back into the oil chamber 4. The provision of the oil return pipe 17 makes it unnecessary to regularly clean the oil filtered by the filter element, and the oil can naturally flow into the oil chamber 4 along the oil return pipe 17, thus saving maintenance costs.

[0042] The filter element is a cylindrical filter element, including an upper end cover 19 and a lower end cover 20, a cylindrical frame 21 is connected between the upper end cover 19 and the lower end cover 20, and a cylindrical filter layer 22 is connected to the outside of the cylindrical frame 21; the cylindrical frame 21 and the cylindrical filter layer 22 surround a central hole, and the central hole serves as the air inlet part of the filter element and is downwardly connected to the air inlet cavity 15; a clean air cavity 23 is provided between the cylindrical filter layer 22 and the outer wall of the secondary filter shell 3, and the circumferential surface of the cylindrical filter layer 22 serves as the air outlet part of the filter element, and the clean air cavity 23 is connected to the clean air outlet 14.

[0043] The ventilation pipe 13 is connected to the air inlet chamber 15 along the tangential direction, and a vortex that flows along the wall can be formed in the air inlet chamber 15, so as to utilize this vortex to achieve a cyclonic centrifugal oil-liquid separation effect and improve the oil-gas separation effect; that is, the oil in the air flow is retained by the wall of the air inlet chamber 15 and flows downward, and the air flow flows to the filter element along the inherent gas passage.

[0044] When in use, the high-pressure part of the motor vehicle lubricating oil (i.e., engine oil) oil circuit is connected to the oil nozzle 10, so the high-pressure lubricating oil (engine oil) is continuously sprayed to the impeller 8 through the oil nozzle 10, so that the impeller 8 drives the separation discs 9 to rotate at high speed through the main shaft 7. The lubricating oil after pushing the impeller 8 falls to the bottom of the oil chamber 4 and flows back to the crankcase through the oil outlet 12.

[0045] The crankcase blowby gas enters the primary filter housing 2 from the air inlet 11, and undergoes centrifugal motion as it flows downward through the separation discs 9. The oil particles have greater inertia than the gas, and are thus thrown onto the inner wall of the primary filter housing 2 (most of them) and separated from the airflow, flowing downward along the wall to the oil collection tank 16, and finally flowing back into the oil chamber 4, and together with the oil in the oil chamber 4, flowing back to the crankcase through the oil outlet 12.

[0046] The above achieves the first-level oil and gas separation effect.

[0047] The airflow in the primary filter housing 2 after passing through each separation disc 9 flows through the ventilation pipe 13 along the tangential direction to the air inlet chamber 15 in the secondary filter housing 3, forming a vortex flow that flows along the wall. The oil in the airflow is blocked by the wall of the air inlet chamber 15 and flows downward, and the airflow flows along the inherent gas passage to the center hole of the filter element.

[0048] The gas entering the center hole of the filter element passes through the cylindrical filter layer 22 in the radial direction. The oil in the gas is blocked by the cylindrical filter layer 22, flows downward along the cylindrical filter layer 22, and finally flows back into the oil chamber 4 through the oil drop hole 18 and the oil return pipe 17. After passing through the cylindrical filter layer 22, the gas flows upward through the clean gas outlet 14, and the gas that meets the PN value requirements is discharged.

[0049] 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. Oil-driven high-efficiency multi-stage integrated oil-gas separator, including a base, characterized by: The base is upwardly connected with a primary filter housing and a secondary filter housing, and the primary filter housing and the secondary filter housing are arranged side by side and at intervals; The base is concave downwardly corresponding to the first-stage filter housing and is provided with an oil chamber. An upper bearing and a lower bearing are arranged in the first-stage filter housing in a relative manner. The upper bearing and the lower bearing are connected to the first-stage filter housing through a connecting frame. A main shaft is installed between the upper bearing and the lower bearing. The main shaft extends downward into the oil chamber and is connected to an impeller. The main shaft is connected to a plurality of separation discs, each of which is arranged at intervals up and down and is used to separate oil and gas during rotation; The side wall of the oil chamber is provided with an oil spray nozzle, which is used to connect to the high-pressure part of the motor vehicle lubricating oil circuit and introduce high-pressure lubricating oil externally, and to spray the high-pressure lubricating oil on the impeller to drive the main shaft to rotate internally; The top of the primary filter housing is connected with an air inlet for introducing crankcase blowby gas, and the air inlet is used to guide the crankcase blowby gas downward to each separation disc; The first-stage filter housing is downwardly connected to the oil chamber; an oil outlet is provided at the lowest point of the oil chamber for the oil to flow back into the crankcase; A vent pipe is connected to the bottom of the primary filter housing; A filter element is arranged in the secondary filter housing, and a clean air outlet is arranged on the top of the secondary filter housing, which is connected to the air outlet part of the filter element; the air inlet part of the filter element is connected to the air inlet cavity, and the ventilation pipe extends into the secondary filter housing and is connected to the air inlet cavity.

2. The oil-driven high-efficiency multi-stage integrated oil-gas separator according to claim 1 is characterized in that: An oil collecting groove is arranged at the bottom of the primary filter housing along the circumferential direction, and the oil collecting groove is communicated with the oil cavity downward.

3. The oil-driven high-efficiency multi-stage integrated oil-gas separator according to claim 1 is characterized in that: An oil return pipe is provided on the lower surface of the base. The air intake chamber is connected to the oil return pipe downward through an oil drop hole provided on the base. The oil return pipe is connected to the top of the oil chamber and is used to return the oil blocked by the secondary filter housing into the oil chamber.

4. The oil-driven high-efficiency multi-stage integrated oil-gas separator according to any one of claims 1 to 3, characterized in that: The filter element is a cylindrical filter element, including an upper end cover and a lower end cover, a cylindrical frame is connected between the upper end cover and the lower end cover, and a cylindrical filter layer is connected to the outside of the cylindrical frame; the cylindrical frame and the cylindrical filter layer surround a central hole, and the central hole serves as the air inlet part of the filter element and is downwardly connected to the air inlet cavity; a clean air cavity is provided between the cylindrical filter layer and the outer wall of the secondary filter shell, and the circumferential surface of the cylindrical filter layer serves as the air outlet part of the filter element, and the clean air cavity is connected to the clean air outlet.

5. The oil-driven high-efficiency multi-stage integrated oil-gas separator according to any one of claims 1 to 3, characterized in that: The ventilation pipe is communicated with the air inlet cavity along a tangential direction.

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