U-shaped respirator oil return structure capable of effectively preventing oil pumping fault
By adding a U-shaped oil return pipe between the respirator and the oil pan of the diesel engine, the problem of engine oil returning to the combustion chamber and flue gas being directly discharged without filtration is solved, and the effect of effectively preventing oil malfunction and reducing oil consumption is achieved.
Patent Information
- Application Number
- CN202421513214.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The respirator return pipe of the current diesel engine can easily cause the engine oil to rush back to the combustion chamber, causing failure. At the same time, the flue gas is directly discharged without filtering, increasing oil consumption.
Using a U-shaped respirator oil return structure, by adding a U-shaped oil return pipe between the engine respirator and the oil sump, and connecting it with the oil sump through the oil return boss, ensuring that the end of the oil return pipe is higher than the oil level, preventing it from being The engine oil rushes back, and avoids direct leakage of smoke.
Effectively prevent the engine oil from rushing back into the cylinder, reduce the occurrence of faults, avoid the flue gas being directly discharged without filtration, reduce the oil consumption, and improve the separation efficiency of the respirator.
Smart Images
Figure CN222501848U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engine breathers, in particular to a U-shaped breather oil return structure which can effectively prevent oil blowby failure. Background Art
[0002] With the development of diesel engine technology and increasingly stringent requirements on engine quality, existing diesel engine technology has been facing more severe challenges. Effectively reducing the engine failure rate has always been the goal pursued by major manufacturers.
[0003] Reducing oil blowby failure is one of the effective ways to reduce engine failure rate. Most engines now use conventional breather oil return pipes that go straight through the oil pan, such as Figure 1 As shown, under normal circumstances, since the lower end of the breather oil return pipe 15 is immersed in the engine oil, when the crankcase pressure is too high, it is easy for the engine oil in the oil pan 5 to flow back into the combustion chamber through the breather oil return pipe 15, thereby causing a fault. If the lower end of the breather oil return pipe 15 is higher than the engine oil level, although the engine oil can be prevented from flowing back into the combustion chamber, the smoke containing oil particles inside the engine will directly communicate with the air outside the engine through the breather oil return pipe 15, which will cause the smoke to be directly discharged from the engine through the breather oil return pipe 15 without being filtered, resulting in an increase in engine oil consumption; in addition, when the lower end of the breather oil return pipe is higher than the engine oil level, a large amount of smoke will flow out through the breather oil return pipe at a high flow rate, causing the oil filtered by the breather to be directly blown to the outside of the engine, which will also lead to an increase in engine oil consumption. In the event of excessive crankcase pressure, a large amount of oil will flow back into the cylinder and cause a runaway fault, which cannot meet the requirement of reducing the engine failure rate. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a U-shaped breather oil return structure for effectively preventing oil leakage failure in view of the above-mentioned deficiencies in the prior art. The structure can effectively prevent the oil in the oil pan from leaking back into the cylinder and prevent the smoke from directly leaking through the oil return pipe, thereby reducing the occurrence of failures. The utility model has the characteristics of wide application range and strong practicality.
[0005] The technical solution adopted by the utility model is: a U-shaped breather oil return structure for effectively preventing oil blowby failure, comprising an engine breather, wherein the bottom end of the engine breather is connected to a first oil return pipe, an end of the first oil return pipe away from the engine breather is provided with a U-shaped oil return pipe, engine oil for sealing is provided in the U-shaped oil return pipe, an end of the U-shaped oil return pipe away from the first oil return pipe is connected to the top of the oil pan, a connection between the U-shaped oil return pipe and the oil pan is higher than the engine oil level inside the oil pan, an air inlet of the engine breather is connected to the inside of an engine cylinder head through an exhaust pipe, and an air outlet of the engine breather is connected to an air outlet pipe of a supercharger through an air return pipe.
[0006] As a further improvement, a plug connector is provided at one end of the U-shaped oil return pipe away from the first oil return pipe, and an oil return boss connected to the oil pan is provided on the engine body above the oil pan, the plug connector is inserted in the oil return boss, and the oil return boss is arranged at a position higher than the oil level in the oil pan.
[0007] Furthermore, the height of the U-shaped oil return pipe is 200 mm to 300 mm.
[0008] Furthermore, support seats are provided on both sides of the U-shaped oil return pipe, and the support seats are installed on the engine body by bolts.
[0009] Furthermore, the U-shaped oil return pipe is arranged vertically, and two ends of the U-shaped oil return pipe are connected to the first oil return pipe and the oil pan through arc pipes respectively.
[0010] Beneficial Effects
[0011] Compared with the prior art, the utility model has the following advantages:
[0012] The utility model discloses a U-shaped breather oil return structure which effectively prevents oil blowby failure, by adding a U-shaped oil return pipe between the breather and the oil pan, the U-shaped oil return pipe is connected to the oil pan through an oil return boss, and the oil return boss is higher than the oil level in the oil pan, even if the pressure in the crankcase is too large, the oil can be prevented from blowing back into the cylinder through the oil return pipe, thus avoiding the risk of running out of control and reducing the occurrence of failures. Since oil can be retained in the U-shaped oil return pipe, the pipeline between the oil pan and the breather is not connected, thereby preventing smoke from being directly discharged out of the engine through the U-shaped oil return pipe, causing oil waste, and also preventing the oil filtered by the breather from being blown back into the breather, effectively preventing the oil from blowing into the breather, improving the separation efficiency of the breather, and having the characteristics of easy use and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the prior art;
[0014] Figure 2 This is a schematic diagram of the main structure of the utility model;
[0015] Figure 3 It is an enlarged schematic diagram of the structure of the U-shaped oil return pipe in the utility model.
[0016] Among them: 1-engine breather, 2-first oil return pipe, 3-U-type oil return pipe, 4-support seat, 5-oil pan, 6-engine body, 7-return pipe, 8-exhaust pipe, 9-exhaust pipe, 10-supercharger, 11-engine cylinder head, 12-arc pipe, 13-return oil boss, 14-plug connector, 15-breather oil return pipe. DETAILED DESCRIPTION
[0017] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.
[0018] See also Figure 1-3 As shown, the utility model is a U-shaped breather oil return structure for effectively preventing oil blowby failure, comprising an engine breather 1, wherein the bottom end of the engine breather 1 is connected to a first oil return pipe 2, an end of the first oil return pipe 2 away from the engine breather 1 is provided with a U-shaped oil return pipe 3, engine oil for sealing is provided in the U-shaped oil return pipe 3, an end of the U-shaped oil return pipe 3 away from the first oil return pipe 2 is connected to the top of the oil pan 5, a connection between the U-shaped oil return pipe 3 and the oil pan 5 is higher than the engine oil level inside the oil pan 5, an air inlet of the engine breather 1 is connected to the inside of the engine cylinder head 11 through an exhaust pipe 8, an air outlet of the engine breather 1 is connected to an air outlet pipe 9 of a supercharger 10 through an air return pipe 7, smoke generated by a crankcase enters the exhaust pipe 8 from the engine cylinder head 11, and enters the engine breather 1 through the exhaust pipe 8, and after the smoke passes through the engine breather 1 for oil and gas separation, the smoke is separated The separated engine oil flows into the U-shaped oil return pipe 3 through the first oil return pipe 2, and then flows into the oil pan 5 from one end after the U-shaped oil return pipe 3 is filled. By adding a U-shaped oil return pipe 3 between the engine breather 1 and the oil pan 5, the U-shaped oil return pipe 3 is connected to the oil pan 5 through the oil return boss 13, and the oil return boss 13 is higher than the engine oil level in the oil pan 5. Even if the pressure in the crankcase is too high, the engine oil can be prevented from flowing back into the cylinder through the oil return pipe, thereby avoiding the risk of running away and reducing the occurrence of malfunctions. Since engine oil can be retained in the U-shaped oil return pipe 3, the pipeline between the oil pan 5 and the breather is not connected, thereby preventing smoke from being directly discharged out of the engine through the U-shaped oil return pipe, causing oil waste, and also preventing the engine oil filtered by the breather from being blown back into the breather, effectively preventing the engine oil from flowing into the breather and improving the separation efficiency of the breather.
[0019] Specifically, a plug connector 14 is provided at one end of the U-shaped oil return pipe 3 away from the first oil return pipe 2, and an oil return boss 13 connected to the oil pan 5 is provided on the engine body 6 above the oil pan 5. The plug connector 14 is plugged into the oil return boss 13. The oil return boss 13 is arranged at a position higher than the oil level in the oil pan 5. The provision of the oil return boss 13 facilitates the U-shaped oil return pipe to be connected to the oil pan 5 through the plug connector 14, which is beneficial to speeding up the assembly efficiency and is also convenient for later maintenance and disassembly.
[0020] Preferably, the height of the U-shaped oil return pipe 3 is 200mm to 300mm. The crankcase pressure detected during the engine test process in different power ranges can be used to design the U-shaped pipe length corresponding to the applicable crankcase pressure range through calculation to overcome the crankcase pressure. When the crankcase pressure is too high, the oil can be prevented from flowing back into the cylinder to cause a runaway phenomenon.
[0021] Furthermore, support seats 4 are provided on both sides of the U-shaped oil return pipe 3, and the support seats 4 are installed on the engine body 6 by bolts, which can effectively avoid problems such as position deviation of the U-shaped oil return pipe 3 caused by long-term vibration of the engine.
[0022] Furthermore, the U-shaped oil return pipe 3 is arranged vertically, so that a certain height of engine oil can be effectively stored in the U-shaped oil return pipe 3, thereby preventing smoke from being directly discharged from the U-shaped oil return pipe 3. The two ends of the U-shaped oil return pipe 3 are connected to the first oil return pipe 2 and the oil pan 5 through the arc pipe 15, respectively, to reduce the resistance to the oil circulation.
[0023] The U-shaped respirator oil return structure of the present embodiment which effectively prevents oil blowby failure, when in use, the smoke generated by the crankcase enters the exhaust pipe 8 from the engine cylinder head 11, and enters the engine respirator 1 through the exhaust pipe 8. After the smoke passes through the engine respirator 1 for oil and gas separation, the separated engine oil flows into the U-shaped oil return pipe 3 through the first oil return pipe 2, and then flows into the oil pan 5 from one end after the U-shaped oil return pipe 3 is filled. By adding a U-shaped oil return pipe 3 between the engine respirator 1 and the oil pan 5, the U-shaped oil return pipe 3 is connected to the oil pan 5 through the oil return boss 13. The oil return boss 13 is higher than the oil level in the oil pan 5. Even if the pressure in the crankcase is too high, the oil can be prevented from flowing back into the cylinder through the oil return pipe, avoiding the risk of running away and reducing the occurrence of faults. Since oil can be retained in the U-shaped oil return pipe 3, the pipeline between the oil pan 5 and the respirator is not connected, thereby preventing the smoke from being directly discharged out of the engine through the U-shaped oil return pipe, causing oil waste. At the same time, it also prevents the oil filtered out of the respirator from being blown back into the respirator, effectively preventing the oil from flowing into the respirator and improving the separation efficiency of the respirator. The utility model is a U-shaped respirator oil return structure that effectively prevents oil from flowing back into the cylinder, while preventing smoke from directly leaking through the oil return pipe, thereby reducing the occurrence of faults. It has the characteristics of a wide range of applications and strong practicality.
[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. A U-shaped respirator oil return structure that effectively prevents oil blowby failure, characterized in that: The invention comprises an engine breather (1), wherein the bottom end of the engine breather (1) is connected to a first oil return pipe (2), and one end of the first oil return pipe (2) away from the engine breather (1) is provided with a U-shaped oil return pipe (3), wherein the U-shaped oil return pipe (3) is provided with engine oil for sealing, and one end of the U-shaped oil return pipe (3) away from the first oil return pipe (2) is connected to the top of an oil pan (5), and the connection between the U-shaped oil return pipe (3) and the oil pan (5) is higher than the engine oil level inside the oil pan (5), and the air inlet of the engine breather (1) is connected to the inside of an engine cylinder head (11) through a smoke exhaust pipe (8), and the air outlet of the engine breather (1) is connected to an air outlet pipe (9) of a supercharger (10) through an air return pipe (7).
2. A U-shaped respirator oil return structure for effectively preventing oil blowby failure according to claim 1, characterized in that: A plug connector (14) is provided at one end of the U-shaped oil return pipe (3) away from the first oil return pipe (2); an oil return boss (13) connected to the oil pan (5) is provided on the engine body (6) above the oil pan (5); the plug connector (14) is plugged into the oil return boss (13); and the oil return boss (13) is arranged at a position higher than the oil level in the oil pan (5).
3. A U-shaped respirator oil return structure for effectively preventing oil blowby failure according to claim 1, characterized in that: The height of the U-shaped oil return pipe (3) is 200 mm to 300 mm.
4. The U-shaped respirator oil return structure for effectively preventing oil blowby failure according to claim 1 is characterized in that: Support seats (4) are provided on both sides of the U-shaped oil return pipe (3), and the support seats (4) are mounted on the engine body (6) by means of bolts.
5. The U-shaped respirator oil return structure for effectively preventing oil blowby failure according to claim 1 is characterized in that: The U-shaped oil return pipe (3) is arranged vertically, and both ends of the U-shaped oil return pipe (3) are connected to the first oil return pipe (2) and the oil pan (5) through arc-shaped pipes (12) respectively.