External negative pressure type crankcase ventilation device

Abstract

The utility model discloses an external negative pressure type crankcase ventilation device which comprises an engine air cylinder, an engine crankcase, an air inlet pipe, a negative pressure intensifier, an exhaust pipe, an oil-gas separator, a mixing pipe and an oil return pipe. The negative pressure intensifier comprises a cylindrical shell, a first contraction section, a first throat channel, a first diffusion section, an injection opening, a second contraction section, a second throat channel, a second diffusion section, a first pore plate, a spring, a valve element, a second pore plate, a fixing column and a nut. A first contraction section, a first throat and a first diffusion section are sequentially arranged in the cylindrical shell. Ventilation of the engine crankcase can be achieved, a power source for ventilation is convenient to take and use, and loss of engine oil can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an external negative pressure crankcase ventilation device. Background Art

[0002] In order to prevent the crankcase pressure from being too high, extend the service life of the engine oil, reduce parts wear and corrosion, and prevent engine oil leakage, crankcase ventilation must be implemented. In addition, in order to meet increasingly stringent emission requirements and improve economy, the crankcase ventilation system must also be implemented during the automobile engine design process.

[0003] Some engines are now designed to be negative pressure. In the case of new cars, they will also be in a negative pressure state. However, after use, the engine wears out, including the formation of carbon deposits, especially the formation of carbon deposits on the piston rings, and the piston ring sealing decreases, resulting in an increase in piston blowby. When the blowby volume is greater than the negative pressure intake volume, negative pressure cannot be achieved. The original car's oil-gas separation capacity is limited. When it exceeds the design value, part of the exhaust gas containing engine oil will follow the intake manifold and eventually enter the combustion chamber for combustion, which is commonly known as burning engine oil. This is also the biggest reason for engines burning engine oil on the market. To solve the above problems, we propose an external negative pressure crankcase ventilation device. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an external negative pressure crankcase ventilation device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An external negative pressure crankcase ventilation device comprises an engine cylinder, an engine crankcase, an intake pipe, a negative pressure intensifier, an exhaust pipe, an oil-gas separator, a mixing pipe, and an oil return pipe. The intake pipe is connected to the engine cylinder, and a negative pressure intensifier is installed inside the intake pipe. The negative pressure intensifier comprises a cylindrical shell, a first contraction section, a first throat, a first diffusion section, an injection port, a second contraction section, a second throat, a second diffusion section, a first orifice plate, a spring, a valve core, a second orifice plate, a fixing column, and a nut. The cylindrical shell is fixedly sleeved in the intake pipe, and the first contraction section, the first throat, and the first diffusion section are sequentially arranged inside the cylindrical shell. The first orifice plate and the second orifice plate are sleeved at both ends of the cylindrical shell, respectively. The first orifice plate is fixedly sleeved with a fixing column, the fixing column is sleeved with a spring, the fixing column is slidably sleeved with a valve core, the fixing column slides through the second orifice plate and is sleeved with a nut through a thread, the inner wall of the cylindrical shell is provided with a through hole, the through hole is connected with the interior of the cylindrical shell, the interior of the through hole is sequentially provided with a second contraction section, a second throat and a second diffusion section, the side of the cylindrical shell is provided with an injection port connected with the through hole, the injection port is connected with the outlet of the oil-gas separator through an exhaust pipe, the inlet of the oil-gas separator extracts the oil and gas in the engine crankcase through a mixing pipe, and the oil return port of the oil-gas separator reflows the separated engine oil into the engine crankcase through the oil return pipe.

[0007] Preferably, the engine crankcase consists of an upper crankcase and a lower crankcase, the mixing pipe is connected to the oil cap of the upper crankcase, and the oil return pipe is connected to the lower crankcase.

[0008] Preferably, one end of the valve core is a conical surface, and the valve core is located in the first diffusion section.

[0009] Preferably, the structures of the first orifice plate and the second orifice plate are completely the same.

[0010] Preferably, a pipe joint is installed in the injection port, and the exhaust pipe is connected to the injection port via the pipe joint.

[0011] Preferably, a first slot and a second slot are respectively provided at both ends of the cylindrical shell, the first orifice plate is sleeved in the first slot, and the second orifice plate is sleeved in the second slot.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, the air flow pressure is relatively large, and the engine cylinder inhales air through the intake pipe. The inhaled air flows through the negative pressure intensifier. At this time, the valve core moves and the valve core squeezes the spring, and the spring contracts. When the air flows in the first contraction section, the first throat, and the first diffusion section, negative pressure is generated, so that air can be inhaled through the injection port, and then the oil and gas in the engine crankcase can be extracted through the mixing pipe to enter the oil-gas separator. The oil-gas separator thoroughly separates the oil and gas inhaled from the engine crankcase, and the separated engine oil returns to the oil pan of the engine crankcase through the oil return pipe. The separated air enters the intake pipe through the exhaust pipe and mixes with fresh air, thereby realizing the ventilation of the engine crankcase. The power source of ventilation is convenient to use, and the engine oil loss can be reduced;

[0014] 2. In the utility model, when the engine is idling, the air flow pressure is not large, and the air flows through the through hole. Negative pressure can also be generated when the air flows through the second contraction section, the second throat, and the second diffusion section in the through hole. Similarly, ventilation of the engine crankcase can be achieved, and at this time, the air mainly flows through the through hole, which can reduce the vibration of the valve core and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of an external negative pressure crankcase ventilation device proposed by the utility model;

[0016] Figure 2 A cross-sectional view of a negative pressure intensifier of an external negative pressure crankcase ventilation device proposed by the utility model;

[0017] Figure 3 A cross-sectional view of a cylindrical shell of an external negative pressure crankcase ventilation device proposed by the utility model;

[0018] Figure 4 This is a structural schematic diagram of a valve core of an external negative pressure crankcase ventilation device proposed by the utility model;

[0019] Figure 5 This is a schematic structural diagram of a first orifice plate of an external negative pressure crankcase ventilation device proposed by the utility model.

[0020] In the figure: 1 engine cylinder, 2 engine crankcase, 3 intake pipe, 4 negative pressure intensifier, 41 cylindrical shell, 411 first contraction section, 412 first throat, 413 first diffusion section, 414 first slot, 415 second slot, 416 injection port, 417 second contraction section, 418 second throat, 419 second diffusion section, 42 first orifice plate, 43 spring, 44 valve core, 45 pipe joint, 46 second orifice plate, 47 fixing column, 48 nut, 5 exhaust pipe, 6 oil-gas separator, 7 mixing pipe, 8 oil return pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1 , Figure 2 , Figure 3 , an external negative pressure crankcase ventilation device, comprising an engine cylinder 1, an engine crankcase 2, an intake pipe 3, a negative pressure intensifier 4, an exhaust pipe 5, an oil-gas separator 6, a mixing pipe 7, and an oil return pipe 8, the intake pipe 3 is connected to the engine cylinder 1, and a negative pressure intensifier 4 is installed inside the intake pipe 3, and the negative pressure intensifier 4 comprises a cylindrical shell 41, a first contraction section 411, a first throat 412, a first diffusion section 413, an injection port 416, a second contraction section 417, a second throat 418, a second diffusion section 419, a first orifice plate 42, a spring 43, a valve core 44, a second orifice plate 46, a fixing column 47, and a nut 48, the cylindrical shell 41 is fixedly sleeved in the intake pipe 3, and the first contraction section 411, the first throat 412, and the first diffusion section 413 are sequentially arranged inside the cylindrical shell 41, and the first orifice plate 42 and the second orifice plate 46 are sleeved at both ends of the cylindrical shell 41, and the first orifice plate 42 is on the first orifice plate 42. A fixed sleeve is provided with a fixed column 47, a spring 43 is sleeved on the fixed column 47, a valve core 44 is slidably sleeved on the fixed column 47, the fixed column 47 slides through the second orifice plate 46 and is sleeved with a nut 48 through a thread, a through hole is provided on the inner wall of the cylindrical shell 41, the through hole is connected to the interior of the cylindrical shell 41, and a second contraction section 417, a second throat 418, and a second diffusion section 419 are sequentially provided inside the through hole, an injection port 416 connected to the through hole is provided on the side of the cylindrical shell 41, the injection port 416 is connected to the outlet of the oil-gas separator 6 through the exhaust pipe 5, the inlet of the oil-gas separator 6 extracts the oil and gas in the engine crankcase 2 through the mixing pipe 7, and the oil return port of the oil-gas separator 6 re-flows the separated engine oil into the engine crankcase 2 through the oil return pipe 8, the engine crankcase 2 is composed of an upper crankcase and a lower crankcase, the mixing pipe 7 is connected to the oil cover of the upper crankcase, and the oil return pipe 8 is connected to the lower crankcase.

[0023] Reference Figure 4 One end of the valve core 44 is a conical surface, and the valve core 44 is located in the first diffusion section 413.

[0024] Reference Figure 5 The structures of the first orifice plate 42 and the second orifice plate 46 are completely the same.

[0025] Reference Figure 2 , Figure 3A pipe joint 45 is installed in the injection port 416, and the exhaust pipe 5 is connected to the injection port 416 through the pipe joint 45. The first card groove 414 and the second card groove 415 are respectively provided at both ends of the cylindrical shell 41. The first orifice plate 42 is sleeved in the first card groove 414, and the second orifice plate 46 is sleeved in the second card groove 415.

[0026] Working principle: When the engine is in use, the air flow pressure is relatively high, the engine cylinder 1 inhales air through the intake pipe 3, and the inhaled air flows through the negative pressure intensifier 4. At this time, the valve core 44 moves and the valve core 44 squeezes the spring 43, and the spring 43 contracts. When the air flows in the first contraction section 411, the first throat 412, and the first diffusion section 413, negative pressure is generated, so that air can be inhaled through the injection port 416, and then the oil and gas in the engine crankcase 2 can be extracted through the mixing pipe 7 to enter the oil-gas separator 6. The oil-gas separator 6 completely separates the oil and gas inhaled from the engine crankcase 2. The separated engine The oil returns to the oil pan of the engine crankcase 2 through the oil return pipe 8, and the separated air enters the intake pipe 3 through the exhaust pipe 5 and mixes with the fresh air, thereby realizing ventilation of the engine crankcase. The power source of ventilation is convenient to use and can reduce oil loss. When the engine is idling, the air flow pressure is not large, and the air flows through the through hole. Negative pressure can also be generated when flowing through the second contraction section 417, the second throat 418, and the second diffusion section 419 in the through hole. Similarly, ventilation of the engine crankcase can be realized, and at this time, the air mainly flows through the through hole, which can reduce the vibration of the valve core 44 and reduce noise.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An external negative pressure crankcase ventilation device, comprising an engine cylinder (1), an engine crankcase (2), an intake pipe (3), a negative pressure intensifier (4), an exhaust pipe (5), an oil-gas separator (6), a mixing pipe (7), and an oil return pipe (8), characterized in that: The intake pipe (3) is connected to the engine cylinder (1), and a negative pressure intensifier (4) is installed inside the intake pipe (3). The negative pressure intensifier (4) comprises a cylindrical shell (41), a first contraction section (411), a first throat (412), a first diffusion section (413), an injection port (416), a second contraction section (417), a second throat (418), a second diffusion section (419), a first orifice plate (42), a spring (43), a valve core (44), a second orifice plate (46), a fixing column (47), and a nut (48). The cylindrical shell (41) is fixedly sleeved in the intake pipe (3), and the first contraction section (411), the first throat (412), and the first diffusion section (413) are sequentially arranged inside the cylindrical shell (41). The first orifice plate (42) and the second orifice plate (46) are sleeved at two ends of the cylindrical shell (41), respectively, and a fixing A spring (43) is sleeved on the fixed column (47), a valve core (44) is slidably sleeved on the fixed column (47), the fixed column (47) slides through the second orifice plate (46) and is sleeved with a nut (48) through a thread, the inner wall of the cylindrical shell (41) is provided with a through hole, the through hole is connected to the inside of the cylindrical shell (41), and the inside of the through hole is sequentially provided with a second contraction section (417), a second throat (418), The second diffusion section (419) is provided with an injection port (416) connected to the through hole on the side of the cylindrical shell (41); the injection port (416) is connected to the outlet of the oil-gas separator (6) through the exhaust pipe (5); the inlet of the oil-gas separator (6) extracts the oil and gas in the engine crankcase (2) through the mixing pipe (7); the oil return port of the oil-gas separator (6) returns the separated engine oil to the engine crankcase (2) through the oil return pipe (8).

2. The external negative pressure crankcase ventilation device according to claim 1, characterized in that: The engine crankcase (2) is composed of an upper crankcase and a lower crankcase, the mixing pipe (7) is connected to the oil cover of the upper crankcase, and the oil return pipe (8) is connected to the lower crankcase.

3. The external negative pressure crankcase ventilation device according to claim 1, characterized in that: One end of the valve core (44) is a conical surface, and the valve core (44) is located in the first diffusion section (413).

4. The external negative pressure crankcase ventilation device according to claim 1, characterized in that: The structures of the first orifice plate (42) and the second orifice plate (46) are completely the same.

5. The external negative pressure crankcase ventilation device according to claim 1, characterized in that: A pipe joint (45) is installed in the injection port (416), and the air extraction pipe (5) is connected to the injection port (416) via the pipe joint (45).

6. The external negative pressure crankcase ventilation device according to claim 1, characterized in that: A first clamping groove (414) and a second clamping groove (415) are respectively provided at both ends of the cylindrical shell (41); the first orifice plate (42) is sleeved in the first clamping groove (414); and the second orifice plate (46) is sleeved in the second clamping groove (415).

Images