Crankcase ventilation system adopting diaphragm type one-way oil return valve

Abstract

The utility model provides a crankcase ventilation system adopting a diaphragm type one-way oil return valve, and relates to the technical field of engines. The crankcase ventilation system adopting the diaphragm type one-way oil return valve comprises an oil-gas separator. The bottom of an oil-gas separator is communicated with an oil outlet pipe, the oil outlet pipe is communicated with a check piece, the check piece is composed of a lower valve body, a middle valve body and an upper valve body, an oil return groove is formed in the middle valve body, a plurality of supporting blocks are installed in the oil return groove, and the same sealing gasket is placed on the supporting blocks. When the engine oil flows back, the sealing gasket floats up to block the through hole in the top of the oil return groove, the oil can be prevented from flowing back, and the service life of the oil return valve is prolonged, so that oil in the oil outlet pipe enters the oil return groove in the middle valve body from the upper valve body through self gravity and flows into the lower valve body through the oil return groove, and the service life of the oil return valve is prolonged. Meanwhile, a backflow pipeline is greatly reduced, the arrangement difficulty can be reduced, and the interference risk with other systems and the freezing risk in winter are reduced.

Description

Technical Field

[0001] The present application relates to the field of engines, and more particularly, to a crankcase ventilation system employing a diaphragm type one-way oil return valve. Background Art

[0002] In the existing structural arrangement of the engine crankcase ventilation system, its components include an oil-gas separator, an oil-gas separator bracket, an air intake pipe, an intake pipe, an exhaust pipe, and an oil return pipe. The main function of the crankcase ventilation system is to separate the oil-gas mixture discharged from the engine and recycle it. The separated gas is guided through a pipeline to the engine intake end and re-enters the engine to participate in the cycle, and the separated oil returns to the engine oil pan through the oil return pipeline. Since the distance from the top of the engine to the oil pan is relatively far, the length of the oil return pipeline of the crankcase ventilation system is relatively long, with a conventional layout of 400 mm, and there is a risk of interference during the layout process. At the same time, the long pipeline also poses a risk of icing in winter. Summary of the Invention

[0003] In order to overcome the existing deficiencies, the embodiments of the present application provide a crankcase ventilation system employing a diaphragm type one-way oil return valve, which can solve the problems of the relatively long length of the above-mentioned return pipeline and the easy occurrence of icing in winter.

[0004] The technical solution adopted by the embodiments of the present application to solve its technical problems is: a crankcase ventilation system employing a diaphragm type one-way oil return valve, including an oil-gas separator, an exhaust pipe and an oil-gas inlet pipe are connected to the outer wall of the oil-gas separator, and an oil outlet pipe is connected to the bottom thereof, and a check member is connected to the bottom outlet end of the oil outlet pipe.

[0005] In a specific implementation manner, the check member includes a lower valve body, a middle valve body is connected to the lower valve body, an upper valve body is connected to the top of the middle valve body, the upper valve body is connected to the oil outlet pipe, and a sealing gasket is arranged in the middle valve body.

[0006] In a specific implementation manner, an oil return groove is formed in the middle valve body, a plurality of support blocks are fixedly installed in the oil return groove, and the sealing gasket is placed on the tops of the plurality of support blocks.

[0007] In a specific implementation manner, the cross-section of the oil return groove is circular, the plurality of support blocks are arranged along the circular cross-section of the oil return groove, and the plurality of support blocks are arranged at equal intervals.

[0008] In a specific implementation manner, a first oil delivery hole is formed in the upper valve body, a through hole is connected between the first oil delivery hole and the oil return groove, and the diameter of the through hole is smaller than the diameter of the sealing gasket.

[0009] In a specific embodiment, a sealing groove is formed at the top of the lower valve body, and a threaded groove is formed at the bottom of the sealing groove. The middle valve body is threadedly connected to the threaded groove.

[0010] In a specific embodiment, an O-ring seal is placed in the sealing groove. The middle valve body is inserted into the sealing groove and presses on the O-ring seal.

[0011] In a specific embodiment, an oil outlet hole communicating with the oil return groove is formed at the bottom of the middle valve body, and a second oil delivery hole is formed in the lower valve body. The second oil delivery hole communicates with the oil outlet hole.

[0012] The advantages of the embodiments of the present application are as follows: By connecting an oil outlet pipe at the bottom of the oil-gas separator, the oil outlet pipe is connected to a check member. The check member is composed of a lower valve body, a middle valve body, and an upper valve body. An oil return groove is formed in the middle valve body, and a plurality of support blocks are installed in the oil return groove. The same sealing gasket is placed on the plurality of support blocks. Thus, the oil in the oil outlet pipe enters the oil return groove in the middle valve body from the upper valve body by its own gravity, and then flows downward into the lower valve body through the oil return groove to achieve the purpose of oil return. When engine oil flows backward, the backward-flowing oil will float the sealing gasket, thereby blocking the through hole at the top of the oil return groove, preventing the oil from flowing backward, and at the same time greatly reducing the return pipeline, reducing the difficulty of layout, and reducing the risk of interference with other systems and the risk of freezing in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic diagram of the main structure of a crankcase ventilation system using a diaphragm type one-way oil return valve provided by an embodiment of the present application;

[0014] Figure 2 FIG. is a schematic diagram of the structure of a check member of a crankcase ventilation system using a diaphragm type one-way oil return valve provided by an embodiment of the present application;

[0015] Figure 3 FIG. is a sectional view of a check member of a crankcase ventilation system using a diaphragm type one-way oil return valve provided by an embodiment of the present application;

[0016] Figure 4 FIG. is a partial structure diagram of a check member of a crankcase ventilation system using a diaphragm type one-way oil return valve provided by an embodiment of the present application;

[0017] Figure 5 FIG. is a top view of a check member of a crankcase ventilation system using a diaphragm type one-way oil return valve provided by an embodiment of the present application.

[0018] In the figure: 10 - oil - gas separator; 20 - outlet pipe; 210 - oil - gas inlet pipe; 30 - oil outlet pipe; 40 - check part; 410 - lower valve body; 420 - middle valve body; 430 - upper valve body; 440 - gasket; 50 - oil return groove; 510 - support block; 60 - first oil delivery hole; 610 - through - hole; 70 - sealing groove; 710 - threaded groove; 720 - O - ring; 80 - oil outlet hole; 90 - second oil delivery hole. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present application are to solve the problem that the length of the reflux pipeline is relatively long and it is easy to freeze in winter. The general idea is as follows:

[0020] Embodiment 1:

[0021] Please refer to Figures 1-5 , a crankcase ventilation system using a diaphragm - type one - way oil return valve, including an oil - gas separator 10. An outlet pipe 20 and an oil - gas inlet pipe 210 are connected to the outer wall of the oil - gas separator 10, and an oil outlet pipe 30 is connected to the bottom of the oil - gas separator 10. The bottom outlet end of the oil outlet pipe 30 is connected to a check part 40. Specifically, the oil - gas separator 10 is connected to the crankcase ventilation system through the oil - gas inlet pipe 210, so that the oil - gas mixture in the crankcase enters the oil - gas separator 10, thereby realizing the separation of oil and gas. The separated gas is then introduced into the engine intake end through the outlet pipe 20 and the existing pipeline, while the separated oil enters the check part 40 through the oil outlet pipe 30. The check part 40 is connected to the existing oil return pipe to realize the delivery of oil to the engine oil pan. At the same time, the check part 40 can prevent reverse flow, and the oil return pipeline can be greatly reduced, which can be reduced to 100 mm.

[0022] Refer to Figure 2 and 3 , the check part 40 includes a lower valve body 410. A middle valve body 420 is connected to the lower valve body 410. The top of the middle valve body 420 is connected to an upper valve body 430. The upper valve body 430 is connected to the oil outlet pipe 30. A gasket 440 is arranged in the middle valve body 420. When setting, the middle valve body 420 and the upper valve body 430 are integrally connected, and the gasket 440 is installed in the middle valve body 420 to block the internal outlet of the middle valve body 420 to prevent reverse flow.

[0023] Refer to Figure 4, an oil return groove 50 is provided in the middle valve body 420. A plurality of support blocks 510 are fixedly installed in the oil return groove 50. The gasket 440 is placed on the top of the plurality of support blocks 510. Specifically, the bottom of the oil return groove 50 is funnel-shaped, so that the oil can flow downward by its own gravity. The plurality of support blocks 510 are fixedly installed on the inclined bottom of the oil return groove 50. At the same time, there is a gap between two adjacent support blocks 510, so that the oil can flow downward through the gap. When the oil flows backward, the oil will enter the oil return groove 50 from the bottom of the oil return groove 50. At the same time, the oil will make the gasket 440 float upward, so as to block the through hole 610 at the top of the oil return groove 50, so as to achieve the purpose of closing and prevent the oil from flowing backward.

[0024] Refer to Figure 3 and 4 , the cross-section of the oil return groove 50 is circular. The plurality of support blocks 510 are arranged along the circular cross-section of the oil return groove 50, and the plurality of support blocks 510 are arranged at equal intervals. A first oil delivery hole 60 is provided on the upper valve body 430. A through hole 610 is communicated between the first oil delivery hole 60 and the oil return groove 50. The diameter of the through hole 610 is smaller than the diameter of the gasket 440. It should be noted that the top view cross-section of the oil return groove 50 is circular. The plurality of support blocks 510 jointly support the gasket 440. The gasket 440 covers the plurality of support blocks 510, and the diameter of the gasket 440 is smaller than the diameter of the through hole 610, so as to prevent the gasket 440 from entering the through hole 610, thereby avoiding affecting the gasket 440 from blocking the through hole 610.

[0025] Refer to Figure 3 , a sealing groove 70 is provided at the top of the lower valve body 410. A threaded groove 710 is provided at the bottom of the sealing groove 70. The middle valve body 420 is threadedly connected to the threaded groove 710. Specifically, the lower valve body 410 is communicated with an existing oil return pipe, and its specific connection structure is the prior art. At the same time, threads are provided on the outer wall of the middle valve body 420, and the threads are adapted to the threaded groove 710 to realize the threaded connection between the middle valve body 420 and the lower valve body 410.

[0026] Refer to Figure 3 , an O-ring 720 is placed in the sealing groove 70. The middle valve body 420 is inserted into the sealing groove 70 and presses on the O-ring 720. An oil outlet hole 80 communicated with the oil return groove 50 is provided at the bottom of the middle valve body 420. A second oil delivery hole 90 is provided on the lower valve body 410. The second oil delivery hole 90 is communicated with the oil outlet hole 80. Specifically, the O-ring 720 is placed in the sealing groove 70, and the middle valve body 420 is threadedly connected to the lower valve body 410, so that the middle valve body 420 passes through the O-ring 720. At the same time, the middle valve body 420 will squeeze the O-ring 720 to improve the sealing effect between the middle valve body 420 and the lower valve body 410.

[0027] When this application is used:

[0028] The oil-gas mixture in the crankcase is transported to the oil-gas separator 10 through the oil-gas inlet pipe 210 via the crankcase ventilation system, thereby achieving the purpose of oil-gas separation. The separated gas is then introduced into the engine intake end through the outlet pipe 20, while the separated oil flows downward under its own gravity and through the oil outlet pipe 30 into the upper valve body 430, and enters the oil return groove 50 through the first oil delivery hole 60 and the through hole 610. Thus, the oil flows downward in the oil return groove 50, and returns to the return pipeline through the oil outlet hole 80 and the second oil delivery hole 90, so that the oil returns to the engine oil pan. Moreover, several support blocks 510 are installed in the oil return groove 50 to support the gasket 440. Therefore, when oil backflows occur, the oil flows from the bottom of the oil return groove 50 into the oil return groove 50, and then the gasket 440 will rise as the oil level rises, and further the gasket 440 seals the through hole 610, thus preventing oil from flowing back.

[0029] It should be noted that the specific model and specification of the oil-gas separator 10 need to be selected according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail here.

[0030] Finally, it should be noted that: Obviously, the above embodiments are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A crankcase ventilation system using a diaphragm type one-way oil return valve, characterized in that, It includes an oil-gas separator (10). An air outlet pipe (20) and an oil-gas inlet pipe (210) are communicated with the outer wall of the oil-gas separator (10), and an oil outlet pipe (30) is communicated with the bottom thereof. A check member (40) is communicated with the bottom outlet end of the oil outlet pipe (30).

2. The crankcase ventilation system using a diaphragm type one-way oil return valve as claimed in claim 1, wherein The check member (40) includes a lower valve body (410). A middle valve body (420) is connected to the lower valve body (410). An upper valve body (430) is communicated with the top of the middle valve body (420). The upper valve body (430) is communicated with the oil outlet pipe (30). A sealing gasket (440) is arranged in the middle valve body (420).

3. The crankcase ventilation system adopting a diaphragm type one-way oil return valve as described in claim 2, wherein An oil return groove (50) is formed in the middle valve body (420). A plurality of support blocks (510) are fixedly installed in the oil return groove (50). The sealing gasket (440) is placed on the tops of the plurality of support blocks (510).

4. The crankcase ventilation system adopting a diaphragm type one-way oil return valve as claimed in claim 3, wherein, The cross section of the oil return groove (50) is circular. The plurality of support blocks (510) are arranged along the circular cross section of the oil return groove (50), and the plurality of support blocks (510) are arranged at equal intervals.

5. The crankcase ventilation system using a diaphragm type one-way oil return valve as claimed in claim 3, wherein A first oil delivery hole (60) is formed in the upper valve body (430). A through hole (610) is communicated between the first oil delivery hole (60) and the oil return groove (50). The diameter of the through hole (610) is smaller than the diameter of the sealing gasket (440).

6. The crankcase ventilation system adopting a diaphragm type one-way oil return valve as described in claim 5, characterized in that, A sealing groove (70) is formed in the top of the lower valve body (410). A threaded groove (710) is formed in the bottom of the sealing groove (70). The middle valve body (420) is in threaded connection with the threaded groove (710).

7. The crankcase ventilation system using a diaphragm type one-way oil return valve as claimed in claim 6, wherein, An O-ring (720) is placed in the sealing groove (70). The middle valve body (420) is inserted into the sealing groove (70) and presses on the O-ring (720).

8. The crankcase ventilation system using a diaphragm type one-way oil return valve as claimed in claim 3, wherein An oil outlet hole (80) communicated with the oil return groove (50) is formed in the bottom of the middle valve body (420). A second oil delivery hole (90) is formed in the lower valve body (410). The second oil delivery hole (90) is communicated with the oil outlet hole (80).

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