Valve chamber cover for a diesel engine

Abstract

This utility model discloses a valve chamber cover for a diesel engine, including a cover shell and a breather base plate. The cavity between the cover shell and the breather base plate is a separation chamber, in which a fine separation component is provided. The fine separation component includes a separation cylinder with a separation channel inside. A longitudinal isolation plate separating the left and right sides of the separation chamber is provided around the inlet end of the separation channel. At least one set of air outlets is provided on the side wall of the separation channel. Each set of air outlets includes multiple air outlets spaced apart along the axial direction of the separation channel. A plunger is slidably disposed inside the separation channel. In its natural state, the plunger is elastically pressed against the right limit position of the separation channel by an elastic element. The air outlet on the right side of the plunger is connected to the inlet end of the separation channel. Compared with the prior art, this utility model has the following advantages: it can automatically adjust the size of the air outlet area according to the air pressure, thereby achieving adaptive oil-gas separation and improving separation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine technology, and in particular to a valve cover for a diesel engine. Background Technology

[0002] The valve cover is mounted on the cylinder head and its sealing structure prevents lubricating oil leakage while blocking external dust, moisture, and other contaminants from entering the valve chamber, maintaining a clean internal working environment. The breather inside the valve cover is used to expel exhaust gases from the crankcase, maintaining stable crankcase pressure and preventing excessive pressure from damaging the oil seals.

[0003] In existing technology, the breather inside the valve cover typically uses a separation chamber with a constant cross-sectional area to discharge crankcase exhaust gases. Oil-gas separation is achieved through the impact of the inner wall of the separation chamber and baffles on the inner wall. The separated oil flows back into the crankcase through the return valve of the return port, while the separated gas is discharged into the atmosphere through the exhaust port of the breather. This type of breather uses an impact-type coarse separation method for oil-gas separation. Under both large and small blow-by volumes of engine gas, the breather's separation efficiency cannot be guaranteed simultaneously. This results in the exhaust mixture containing excessive engine oil and combustion pollutants, leading to non-compliant emissions. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a valve cover for a diesel engine that can automatically adjust the size of the outlet area according to the air pressure, thereby achieving adaptive oil-gas separation and improving separation efficiency.

[0005] This utility model is achieved through the following technical solution: A valve chamber cover for a diesel engine includes a cover shell, a breather base plate fixed to the bottom of the cover shell, and a separation chamber formed between the cover shell and the breather base plate. The separation chamber is provided with a fine separation component, which includes a separation cylinder and a separation channel inside the separation cylinder. The right end of the separation channel is the inlet end and the left end is the outlet end. A longitudinal isolation plate is provided around the inlet end of the separation channel of the separation cylinder to separate the left and right sides of the separation chamber. At least one set of air outlet holes is provided on the side wall of the separation channel. Each set of air outlet holes includes multiple air outlet holes spaced apart along the axial direction of the separation channel. A plunger is slidably disposed inside the separation channel. In its natural state, the plunger is elastically pressed against the right limit position of the separation channel by an elastic element. The air outlet hole on the right side of the plunger is connected to the inlet end of the separation channel.

[0006] As a preferred embodiment of the valve chamber cover of the aforementioned diesel engine, each group of air outlet holes of the separator cylinder is provided with a filter component around its periphery, and a retaining plate is provided on the outside of the filter component. The filter component is pressed onto the outside of the separator cylinder by engaging with the retaining plate.

[0007] As a preferred embodiment of the valve chamber cover of the aforementioned diesel engine, the outer side of the separator cylinder is provided with an installation frame on the outer side of each group of exhaust ports. The outer side of the installation frame is provided with an isolation channel separated by multiple partitions. The multiple isolation channels are connected one-to-one with the outer side of the multiple exhaust ports of the corresponding exhaust port group. The filter component is located on the outer side of the multiple isolation channels.

[0008] As a preferred embodiment of the valve cover of the aforementioned diesel engine, a limiting sleeve is fixedly installed at the left end of the separation channel of the separating cylinder. The internal channel of the limiting sleeve allows the rod of the plunger to extend and retract. The elastic element is a spring fitted outside the rod of the plunger. The right end of the spring elastically presses against the plunger body at the right end, and the left end of the spring elastically presses against the limiting step of the internal channel of the limiting sleeve.

[0009] As a preferred embodiment of the valve cover of the aforementioned diesel engine, the inner wall of the separation channel of the separator cylinder near the inlet end is provided with at least one limiting protrusion. The limiting protrusion abuts against the right end of the plunger, thereby limiting the right limit position of the plunger's movement to the right.

[0010] As a preferred embodiment of the valve chamber cover of the aforementioned diesel engine, the separation cylinder has an exhaust port group on both the front and rear sides of the separation channel.

[0011] As a preferred embodiment of the valve cover of the aforementioned diesel engine, the cover shell is provided with a preheating plug oil seal, an injector oil seal, and an injector mounting bolt oil seal, and multiple sets of combined bolts are provided around the cover shell.

[0012] As a preferred embodiment of the valve cover of the aforementioned diesel engine, the fine separation assembly is disposed in the middle section of the separation chamber.

[0013] As a preferred embodiment of the valve chamber cover of the aforementioned diesel engine, the bottom plate of the breather is provided with an air inlet connected to the right end of the separation chamber, and the outer shell of the cover is provided with an air outlet connected to the left end of the separation chamber.

[0014] This invention has the following advantages over the prior art: This utility model provides a valve chamber cover for a diesel engine, which incorporates a fine separation component in the separation chamber of the breather. This combination of coarse and fine separation of the gas mixture improves separation efficiency. Simultaneously, the fine separation component automatically adjusts the outlet area based on the crankcase cylinder pressure, achieving adaptive oil-gas separation. This ensures efficient oil-gas separation even with large or small blow-by volumes, preventing excessive pollutants in the exhaust gases and ensuring that emissions meet standards. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention.

[0016] Figure 2 This is a three-dimensional exploded view of this utility model.

[0017] Figure 3 This is a top view of the present invention.

[0018] Figure 4 yes Figure 3 AA sectional view.

[0019] Figure 5 This is a perspective view of the fine separation component of this utility model.

[0020] Figure 6 This is a three-dimensional exploded view of the fine separation component of this utility model.

[0021] Figure 7 This is a cross-sectional view of the fine separation component of the utility model after being horizontally cut open from the separation channel.

[0022] The following numbers are labeled in the diagram: 1. Cover shell; 2. Combination bolt; 3. Preheat plug oil seal; 4. Injector oil seal; 5. Injector mounting bolt oil seal; 6. Breather base plate; 7. Separation chamber; 8. Air inlet; 9. Air outlet; 10. Air inlet top plate; 11. First baffle; 12. Second baffle; 13. Fine separation assembly; 14. Separation cylinder; 15. Base; 16. Separation channel; 17. Longitudinal isolation plate; 18. Air outlet; 19. Plunger; 20. Limiting protrusion; 21. Limiting sleeve; 22. Spring; 23. Filter component; 24. Clamping plate; 25. Mounting frame; 26. Spacer bar; 27. Isolation channel; 28. Slot; 29. ​​Clamping rib; 30. Return valve. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0024] See Figures 1 to 7 This embodiment discloses a valve cover for a diesel engine, including a cover shell 1. Multiple sets of combined bolts 2 are provided around the cover shell 1 for bolting the valve cover to the cylinder head. The cover shell 1 integrates a glow plug oil seal 3, an injector oil seal 4, and an injector mounting bolt oil seal 5, which are used to seal the glow plug, injector, and bolts used for mounting the injector, respectively, mounted on the cylinder head.

[0025] A respirator base plate 6 is welded and fixed to the bottom of the cover shell 1. The cavity formed between the cover shell 1 and the respirator base plate 6 is a separation chamber 7. The respirator base plate 6 is provided with an air inlet 8 that communicates with the right end of the separation chamber 7, and the cover shell 1 is provided with an air outlet 9 that communicates with the left end of the separation chamber 7. An air inlet top plate 10 is provided at the top of the air inlet 8 of the respirator base plate 6, and multiple first baffles 11 are provided on the air inlet top plate 10. A second baffle 12 is provided on the top wall of the separation chamber 7 near the air inlet 8. The first baffles 11 and the second baffles 12 are used to impact the passing mixed gas, achieving coarse separation of oil and gas.

[0026] A fine separation component 13 is provided in the separation chamber 7, and the fine separation component 13 is located in the middle section of the separation chamber 7. The fine separation component 13 includes a separation cylinder 14, the bottom of which is fixedly mounted on the respirator base plate 6 via a base 15. A separation channel 16 is provided inside the separation cylinder 14, with the right end of the separation channel 16 being the inlet end and the left end being the outlet end. A longitudinal isolation plate 17 is provided around the inlet end of the separation channel 16 of the separation cylinder 14 to separate the left and right sides of the separation chamber 7. At least one set of air outlet holes is provided on the side wall of the separation channel 16. In this embodiment, air outlet holes are provided on the front and rear sides of the separation channel 16 of the separation cylinder 14. Each set of air outlet holes includes multiple air outlet holes 18 spaced apart along the axial direction of the separation channel 16. A plunger 19 is slidably disposed inside the separation channel 16. In its natural state, the plunger 19 is elastically pressed against the right limit position of the separation channel 16 by an elastic element. The air outlet hole 18 located on the right side of the plunger 19 is connected to the inlet end of the separation channel 16. The inner wall of the separation channel 16 of the separation cylinder 14 near the inlet end is provided with at least one limiting protrusion 20. The limiting protrusion 20 abuts against the right end of the plunger 19, thereby limiting the right limit position of the plunger 19 to the right.

[0027] The left end of the separation channel 16 of the separation cylinder 14 is fixedly installed with a limiting sleeve 21 by means of screw connection. The internal channel of the limiting sleeve 21 allows the rod of the plunger 19 to move telescopically. The elastic element is a spring 22 fitted outside the rod of the plunger 19. The right end of the spring 22 elastically presses against the plug body at the right end of the plunger 19, and the left end of the spring 22 elastically presses against the limiting step in the internal channel of the limiting sleeve 21.

[0028] Each group of air outlets in the separator 14 is surrounded by a filter element 23, which can be a filter cotton block. A retaining plate 24 is provided on the outside of the filter element 23, which engages with the separator 14 to press the filter element 23 onto the outside of the separator 14. The retaining plate 24 has a slot 28 at its top, and the mounting frame 25 has a retaining rib 29 at its top. The retaining plate 24 engages with the retaining rib 29 at the top of the mounting frame 25 via the slot 28. An mounting frame 25 is provided on the outside of each group of air outlets on the outer side of the separator 14. The mounting frame 25 has isolation channels 27 separated by multiple spacers 26 on its outer side. These isolation channels 27 are connected one-to-one with the outer sides of the multiple air outlets 18 of the corresponding group of air outlets. The filter element 23 is located outside the multiple isolation channels 27. The multiple isolation channels 27 increase the contact area between the mixed gas and the filter element 23, resulting in more thorough filtration.

[0029] During operation, the gas-fuel mixture in the crankcase enters the separation chamber 7 through the intake port 8, flows from right to left within the separation chamber 7, and is finally discharged into the atmosphere through the outlet port 9. Coarse oil-gas separation is achieved through the impact of multiple first baffles 11 on the intake top plate 10 above the intake port 8, multiple second baffles 12 on the top wall of the separation chamber 7, and the inner wall of the separation chamber 7. When the gas-fuel mixture reaches the fine separation component 13, it enters through the inlet end of the right end of the separation channel 16, flows laterally through the outlet port 18 connected to the inlet end of the separation channel 16, and flows to the left section of the separation chamber 7 after being filtered by the filter component 23, achieving fine oil-gas separation. The separated oil flows into the return port at the bottom of the separation chamber 7 and is intermittently introduced into the crankcase through the one-way return valve 30.

[0030] In this component, the plunger 19 of the fine separation assembly 13 automatically adjusts its opening according to the pressure of the gas mixture in the crankcase. When the pressure in the crankcase is low, the plunger 19 is in the right limit position under the elastic force of the spring 22 and remains stationary. At this time, there are fewer air outlets 18 on the right side of the plunger 19, that is, fewer air outlets 18 that are connected to the inlet end of the separation channel 16, resulting in a smaller total air outlet area. As the pressure in the crankcase gradually increases, it overcomes the elastic force of the spring 22 and pushes the plunger 19 to the left, increasing the number of air outlets 18 on the right side of the plunger 19, thereby increasing the total air outlet area and quickly discharging the gas mixture to avoid excessive pressure in the crankcase cylinder.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve chamber cover for a diesel engine, comprising a cover shell, a breather base plate fixed to the bottom of the cover shell, and a cavity formed between the cover shell and the breather base plate as a separation chamber, characterized in that: The separation chamber is equipped with a fine separation component, which includes a separation cylinder and a separation channel inside the separation cylinder. The right end of the separation channel is the inlet end and the left end is the outlet end. The periphery of the inlet end of the separation channel of the separation cylinder is equipped with a longitudinal isolation plate that separates the left and right sides of the separation chamber. At least one set of air outlets is provided on the side wall of the separation channel. Each set of air outlets includes multiple air outlets spaced apart along the axial direction of the separation channel. A plunger is slidably installed inside the separation channel. In its natural state, the plunger is elastically pressed against the right limit position of the separation channel by an elastic element. The air outlet located on the right side of the plunger is connected to the inlet end of the separation channel.

2. A valve chamber cover for a diesel engine as claimed in claim 1, characterised in that: Each group of air outlets of the separator is provided with a filter component on its periphery. The filter component is provided with a retaining plate on its outer side. The retaining plate is engaged with the separator to press the filter component onto the outside of the separator.

3. A valve chamber cover for a diesel engine as claimed in claim 2, characterised in that: The outer side of the separator cylinder is provided with an installation frame on the outer side of each group of air outlets. The outer side of the installation frame is provided with an isolation channel separated by multiple partitions. The multiple isolation channels are connected to the outer side of the multiple air outlets of the corresponding group of air outlets one by one. The filter component is located on the outer side of the multiple isolation channels.

4. A valve chamber cover for a diesel engine as defined in claim 1, characterized in that: A limiting sleeve is fixedly installed at the left end of the separation channel of the separating cylinder. The internal channel of the limiting sleeve allows the rod of the plunger to extend and retract. The elastic element is a spring fitted outside the rod of the plunger. The right end of the spring elastically presses against the plunger body at the right end, and the left end of the spring elastically presses against the limiting step of the internal channel of the limiting sleeve.

5. A valve chamber cover for a diesel engine as defined in claim 1, characterized in that: The inner wall of the separation channel of the separation cylinder near the inlet end is provided with at least one limiting protrusion. The limiting protrusion abuts against the right end of the plunger, thereby limiting the right limit position of the plunger's movement to the right.

6. A valve chamber cover for a diesel engine as defined in claim 1, characterized in that: The separation cylinder has air outlet groups on both the front and rear sides of the separation channel.

7. A valve chamber cover for a diesel engine as defined in claim 1, characterized in that: The cover shell is equipped with a preheating plug oil seal, an injector oil seal, and an injector mounting bolt oil seal, and multiple sets of combined bolts are provided around the cover shell.

8. A valve chamber cover for a diesel engine as defined in claim 1, characterized in that: The fine separation component is located in the middle section of the separation chamber.

9. The valve cover of a diesel engine as described in claim 1, characterized in that: The respirator base plate is provided with an air inlet that communicates with the right end of the separation chamber, and the cover shell is provided with an air outlet that communicates with the left end of the separation chamber.

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