Engine closed oil-gas separator with PCV valve

Abstract

The utility model discloses an engine closed type oil-gas separator with a PCV valve, which comprises a shell, a PCV valve assembly and an oil-gas filtering device, the PCV valve assembly and the oil-gas filtering device are arranged in the shell, the shell is provided with a blow-by gas inlet, a blow-by gas outlet and an oil return port, and oil gas entering the shell through the blow-by gas inlet sequentially passes through the PCV valve assembly and the oil-gas filtering device and then is discharged out of the shell through the blow-by gas outlet. And entering an air inlet system. According to the oil-gas separator, engine oil particles in oil-gas mixed gas are efficiently separated and flow back to an oil pan, the separated gas enters a gas inlet system and a combustion chamber through an external rubber pipe at a blow-by gas outlet to participate in combustion, in this way, closed circulation is formed, and meanwhile the problem that the environment is polluted by exhausted waste gas is solved to a certain degree. The PCV valve assembly is a crankcase forced ventilation device and can adjust the opening degree of a PCV valve body in real time according to different working conditions of an engine, and therefore balance of pressure in a crankcase is guaranteed in real time.

Description

Technical Field

[0001] The utility model relates to automobile technology, in particular to engine technology. Background Art

[0002] During engine operation, piston blowby enters the crankcase. Excessive engine piston blowby will cause excessive pressure in the crankcase, resulting in air and oil leakage between the various joints. At the same time, the blowby contains oil particles. If it is not cleaned in time, it will cause the oil quality to deteriorate, and the lubrication and cooling effects of the various moving parts will deteriorate, resulting in increased engine wear and affecting the service life of the engine. The traditional solution is to design and install a breather, which is a steel wool type or a labyrinth plate type. This structural type has low separation efficiency, and the ventilation method is natural ventilation. It cannot guarantee the pressure balance in the crankcase of the engine under various working conditions. The separated exhaust gas is directly discharged into the atmosphere, which pollutes the environment to a certain extent. Utility Model Content

[0003] The technical problems solved by the utility model are: improving the separation efficiency of oil and gas, ensuring the balance of the pressure in the crankcase of the engine under various working conditions, and reducing the pollution of the separated gas to the environment.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an engine closed oil-gas separator with a PCV valve, comprising a shell, a PCV valve assembly and an oil-gas filtering device arranged in the shell, the shell being provided with a blowby gas inlet, a blowby gas outlet and an oil return port, the oil and gas entering the shell through the blowby gas inlet sequentially pass through the PCV valve assembly and the oil-gas filtering device, and then are discharged from the shell through the blowby gas outlet, the oil return port is located below the oil-gas filtering device, the PCV valve assembly comprises a PCV valve seat, a PCV valve body movably matched with the PCV valve seat, and a spring arranged between the PCV valve body and the PCV valve seat.

[0005] The oil-gas separator is fixedly mounted above the cylinder head cover, and the blow-by gas outlet is connected to the intake system of the engine. During the operation of the engine, piston blow-by gas enters the housing through the blow-by gas inlet. During the downward movement of the piston (mainly the intake stroke), the intake system evacuates the oil-gas separator to form a vacuum. Under the action of the pressure difference between its upper and lower ends, the PCV valve body in the PCV valve assembly overcomes the resistance of the spring, leaves the PCV valve seat and moves upward. At this time, the PCV valve assembly is in an open state. The oil and gas entering the housing flow through the PCV valve assembly and the oil and gas filter device. After the oil and gas are filtered by the oil and gas filter device, the remaining gas generated enters the engine intake system and combustion chamber through the blow-by gas outlet, participates in the combustion of the engine, and the whole process forms a closed cycle of oil and gas separation. At the same time, the separated oil particles gather under the action of gravity, flow through the oil return port, and flow back to the engine oil pan.

[0006] The shell includes an upper shell and a lower shell which are welded together. The oil and gas filtering device is arranged in the upper shell. The upper shell is provided with the blow-by gas outlet. The PCV valve assembly is embedded in the lower shell. The lower shell is provided with the blow-by gas inlet and the oil return port.

[0007] The lower shell is provided with a plurality of shell mounting holes for mounting and fixing the oil-gas separator above the cylinder head cover.

[0008] A PCV valve assembly mounting seat is provided in the lower housing, and an annular groove structure is provided on the upper end surface of the PCV valve assembly mounting seat. An annular protrusion structure is provided on the lower end surface of the PCV valve seat, which cooperates with the annular groove structure. The cross section of the PCV valve assembly mounting seat is a toothed structure, which is convenient for welding with the PCV valve seat.

[0009] A valve body guide is provided at the center of the PCV valve seat, and a number of ribs extending to the inner wall of the PCV valve seat are evenly distributed around it. The PCV valve body is movably fitted in the valve body guide. A baffle is provided at the lower end of the PCV valve body, and the spring is located between the baffle and the valve body guide. During the operation of the engine, the PCV valve body is in an open state under the action of the pressure difference between its upper and lower ends, and the oil-gas mixture eventually escapes, separates, and participates in the combustion process. The PCV valve assembly can adjust the opening of the PCV valve body in real time according to the different working conditions of the engine, thereby ensuring the balance of the pressure in the crankcase in real time, and realizing the change of the crankcase ventilation mode from natural ventilation to forced ventilation.

[0010] The oil and gas filtering device includes a filter cotton installation barrel arranged in the upper shell, and filter cotton welded in the filter cotton installation barrel. Oil and gas enter the lower space of the PCV valve assembly through the blowby gas inlet, and enter the upper space of the PCV valve assembly through the opened PCV valve assembly. The filter cotton extending downward from the upper shell is tightly fitted with the outer side wall of the PCV valve assembly mounting seat, blocking the upper space of the PCV valve assembly, so that the oil and gas entering the upper space of the PCV valve assembly can only be filtered by the filter cotton and then flow toward the blowby gas outlet.

[0011] The blow-by gas outlet is connected with a hose, and the hose is connected with the air intake system of the engine.

[0012] The oil return port is arranged on the bottom plate of the lower shell, and the bottom plate of the lower shell is arranged to be tilted downward, so that the separated engine oil can be returned more thoroughly and will not be accumulated in the inner cavity of the oil-gas separator.

[0013] The outer cylindrical surface of the blow-by gas inlet is provided with a first check structure, which is equipped with a first sealing ring to prevent leakage from the blow-by gas inlet. The outer cylindrical surface of the oil return port is provided with a second check structure, which is equipped with a second sealing ring to prevent oil leakage when the engine oil flows back.

[0014] The oil-gas separator of the utility model efficiently separates the oil particles in the oil-gas mixture and returns them to the oil pan. The separated gas enters the intake system and the combustion chamber through the external rubber hose at the blowby outlet and participates in the combustion, thus forming a closed cycle and solving the problem of exhaust gas polluting the environment to a certain extent. The PCV valve assembly is a crankcase forced ventilation device, which can adjust the opening of the PCV valve body in real time according to the different working conditions of the engine, thereby ensuring the balance of the pressure in the crankcase in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the oil-gas separator of the utility model;

[0017] Figure 2 is a schematic diagram of the lower housing;

[0018] Figure 3 is a schematic diagram of a PCV valve assembly;

[0019] Figure 4 This is a schematic diagram of the structure of the oil-gas separator after installation.

[0020] Explanation of symbols in the figure:

[0021] 11. Blow-by gas inlet; 12. Blow-by gas outlet; 13. Oil return port; 131. Second check structure; 132. Second sealing ring; 14. Upper housing; 15. Lower housing; 16. Housing mounting hole; 17. PCV valve assembly mounting seat; 18. Annular groove structure; 19. Bottom plate of lower housing;

[0022] 20. PCV valve assembly; 21. PCV valve seat; 22. PCV valve body; 23. Spring; 24. Annular protrusion structure; 25. Valve body guide rail; 26. Rib; 27. Baffle;

[0023] 30. Filter cotton; 31. Filter cotton installation barrel;

[0024] 40. Hose;

[0025] 50. Cylinder head cover. DETAILED DESCRIPTION

[0026] like Figure 1 , Figure 3, an engine closed oil-gas separator with a PCV valve, comprising a housing, a PCV valve assembly 20 arranged in the housing and an oil-gas filtering device, the housing being provided with a blow-by gas inlet 11, a blow-by gas outlet 12 and an oil return port 13, the oil and gas entering the housing through the blow-by gas inlet sequentially pass through the PCV valve assembly and the oil-gas filtering device, and then are discharged from the housing through the blow-by gas outlet, the oil return port being located below the oil-gas filtering device, the PCV valve assembly 20 comprising a PCV valve seat 21, a PCV valve body 22 movably matched with the PCV valve seat, and a spring 23 arranged between the PCV valve body and the PCV valve seat.

[0027] The shell includes an upper shell 14 and a lower shell 15 welded together, the oil and gas filtering device is arranged in the upper shell, the upper shell is provided with the blowby gas outlet 12, the PCV valve assembly 20 is embedded in the lower shell, and the lower shell is provided with the blowby gas inlet 11 and the oil return port 13.

[0028] refer to Figure 4 The lower housing 15 has three The housing mounting hole 16 is used to mount and fix the oil-gas separator above the cylinder head cover 50.

[0029] like Figure 2 A PCV valve assembly mounting seat 17 is provided in the lower housing 15, and a 1mm×2mm annular groove structure 18 is provided on the upper end surface of the PCV valve assembly mounting seat, and the cross-section of the PCV valve assembly mounting seat is a toothed structure; a 1mm×1.5mm annular protrusion structure 24 is provided on the lower end surface of the PCV valve seat 21, which cooperates with the annular groove structure.

[0030] like Figure 3 A valve body guide rail 25 is provided at the center of the PCV valve seat 21, and a plurality of ribs 26 extending to the inner wall of the PCV valve seat are evenly distributed around the valve body guide rail. The PCV valve body 22 is movably fitted in the valve body guide rail. A baffle 27 is provided at the lower end of the PCV valve body, and the spring 23 is located between the baffle and the valve body guide rail 25.

[0031] like Figure 1 The oil and gas filtering device includes a filter cotton installation barrel 31 arranged in the upper shell 14 and a filter cotton 30 welded in the filter cotton installation barrel.

[0032] The blow-by gas outlet 12 is connected to a hose 40 , which is connected to an air intake system of the engine.

[0033] During the operation of the engine, the piston blowby gas passes through the blowby gas inlet 11 of the oil-gas separator and enters the cavity formed by the PCV valve assembly mounting seat 17 and the PCV valve assembly 20. During the downward movement of the piston, the intake system evacuates the oil-gas separator through the external hose 40 and the blowby gas outlet 12 of the oil-gas separator to form a vacuum. Under the action of the pressure difference between the upper and lower ends, the PCV valve body 22 in the PCV valve assembly 20 overcomes the resistance of the spring 23, leaves the PCV valve seat 21 and moves upward. At this time, the PCV valve assembly 20 is in an open state. The oil-gas mixture in the cavity formed by the PCV valve assembly mounting seat 17 and the PCV valve assembly 20 escapes and flows through the filter cotton 30 welded on the filter cotton mounting barrel 31. After the oil-gas mixture is filtered by the special filter cotton 30, the remaining gas generated passes through the blowby gas outlet 12 set in the oil-gas separator upper shell 14, and enters the engine intake system and combustion chamber through the external hose 40, and participates in the combustion of the engine. The whole process forms a closed cycle of oil-gas separation. At the same time, the separated oil particles gather under the action of gravity, flow through the oil return port 13 provided on the bottom plate 19 of the lower shell of the oil-gas separator, and return to the engine oil pan.

[0034] The bottom plate 19 of the lower shell is downwardly structured at 3 degrees to the horizontal direction, so that the separated engine oil can be returned more thoroughly and will not be accumulated in the oil-gas separation cavity.

[0035] like Figure 1 The outer circumference of the oil return port 13 is provided with a second check structure 131, and the second check structure is equipped with a second sealing ring 132 to avoid oil leakage when the engine oil flows back. The outer circumference of the blowby gas inlet 11 is provided with a first check structure, and the first check structure is equipped with a first sealing ring to avoid leakage of the blowby gas inlet 11.

[0036] The above contents are only preferred implementation modes of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation mode and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. An engine closed oil-gas separator with a PCV valve, comprising a housing, a PCV valve assembly (20) and an oil-gas filtering device arranged in the housing, the housing being provided with a blow-by gas inlet (11), a blow-by gas outlet (12) and an oil return port (13), the oil and gas entering the housing through the blow-by gas inlet sequentially passing through the PCV valve assembly and the oil-gas filtering device, and then being discharged from the housing through the blow-by gas outlet, the oil return port being located below the oil-gas filtering device, and characterized in that: The PCV valve assembly (20) comprises a PCV valve seat (21), a PCV valve body (22) movably matched with the PCV valve seat, and a spring (23) arranged between the PCV valve body and the PCV valve seat.

2. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 1, characterized in that: The shell comprises an upper shell (14) and a lower shell (15) which are welded together, the oil and gas filtering device is arranged in the upper shell, the upper shell is provided with the blow-by gas outlet (12), the PCV valve assembly (20) is embedded in the lower shell, and the lower shell is provided with the blow-by gas inlet (11) and the oil return port (13).

3. The closed oil-gas separator of the engine with a PCV valve as claimed in claim 2, characterized in that: The lower housing (15) is provided with a plurality of housing mounting holes (16) for mounting and fixing the oil-gas separator above the cylinder head cover (50).

4. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 2, characterized in that: A PCV valve assembly mounting seat (17) is arranged in the lower housing (15), an annular groove structure (18) is arranged on the upper end surface of the PCV valve assembly mounting seat, and the cross section of the PCV valve assembly mounting seat is a tooth-shaped structure; an annular protrusion structure (24) is arranged on the lower end surface of the PCV valve seat (21) to cooperate with the annular groove structure.

5. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 1, characterized in that: A valve body guide rail (25) is provided at the center of the PCV valve seat (21), and a plurality of ribs (26) extending to the inner wall of the PCV valve seat are evenly distributed around the valve body guide rail. The PCV valve body (22) is movably fitted in the valve body guide rail. A baffle (27) is provided at the lower end of the PCV valve body, and the spring (23) is located between the baffle and the valve body guide rail (25).

6. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 1, characterized in that: The oil and gas filtering device comprises a filter cotton installation barrel (31) arranged in an upper shell (14) and filter cotton (30) welded in the filter cotton installation barrel.

7. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 1, characterized in that: The blow-by gas outlet (12) is connected to a rubber hose (40), which is connected to an air intake system of the engine.

8. The closed type oil-gas separator of an engine with a PCV valve as claimed in claim 2, characterized in that: The oil return port (13) is arranged on a bottom plate (19) of the lower housing (15), and the bottom plate of the lower housing is arranged to be tilted downward.

9. The closed oil-gas separator of an engine with a PCV valve as claimed in claim 1, characterized in that: The outer circumferential surface of the blow-by gas inlet (11) is provided with a first check structure, which is matched with a first sealing ring; the outer circumferential surface of the oil return port (13) is provided with a second check structure (131), which is matched with a second sealing ring (132).

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