Variable cross-section oil and gas separation structure

Abstract

The utility model relates to the field of engine exhaust and lubricating system discloses a variable cross section oil gas separation structure, including mounting seat, be provided with separation casing on the mounting seat, the inside of separation casing is equipped with the valve plate through the spring, both sides outer walls of separation casing all are provided with filter chamber, the inside of filter chamber is provided with separation filter core, and the side away from separation casing of filter chamber is connected with filter core baffle, the utility model discloses setting up the valve plate of axial movement and the spring mechanism of cooperation with it in separation casing, has realized the self -adaptation adjustment of oil gas separation structure's flow cross section. When the engine is in different working conditions, the valve plate is under the action of pressure difference and automatically adjusts the opening area, makes the structure front and back pressure difference maintain in reasonable range to guarantee the airflow velocity constant before separation filter core, improves oil gas separation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of engine exhaust and lubrication system technology, and in particular to a variable cross-section oil-gas separation structure. Background Technology

[0002] With the continuous upgrading of national emission regulations, the requirements for diesel engines in terms of emission control and fuel economy are becoming increasingly stringent. During engine operation, a certain amount of blow-by gas is generated inside the crankcase, which contains a large number of oil mist particles. If these particles are discharged directly without effective separation, they will not only cause environmental pollution but also lead to carbon buildup in the engine intake system, affecting combustion efficiency and the lifespan of engine components.

[0003] Existing diesel engine oil-gas separators mostly adopt a combination structure of fixed perforated plate and filter cotton. This type of separator has a high separation efficiency at rated speed, but at idle or high speed conditions, the pressure difference deviates from the optimal range due to changes in blow-by volume. Too low or too high airflow velocity will reduce the separation effect, making it difficult to maintain stable and efficient separation performance under all operating conditions. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a variable cross-section oil-gas separation structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A variable cross-section oil-gas separation structure includes a mounting base, on which a separation shell is mounted. A valve plate is installed inside the separation shell via a spring. Filter chambers are provided on both outer walls of the separation shell. Separation filter elements are installed inside the filter chambers. A filter element baffle is snapped onto the side of the filter chamber away from the separation shell. Acceleration holes are provided on both outer walls of the separation shell, and the acceleration holes pass through the channel between the filter chamber and the separation shell. A baffle is provided at one end of the separation shell.

[0007] Preferably, the acceleration holes on both sides of the separation shell are staggered.

[0008] Preferably, the valve plate has a sealing skirt on its side.

[0009] Preferably, the bottom of the filter chamber is provided with several air outlets, through which the gas filtered by the separation filter element is discharged.

[0010] Preferably, an oil collection channel is provided on one side of the filter chamber to collect the oil that has fallen after being separated by the filter element.

[0011] Preferably, the side of the filter element baffle is provided with mounting buckles.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention achieves adaptive adjustment of the flow cross-section of the oil-gas separation structure by incorporating an axially movable valve plate and a corresponding spring mechanism within the separation housing. When the engine operates under different conditions, the valve plate automatically adjusts its opening area under pressure differential, maintaining the pressure difference across the structure within a reasonable range. This ensures a constant airflow velocity before the filter element, improving oil-gas separation efficiency. The staggered arrangement of acceleration holes on both sides of the separation housing creates turbulence as gas passes through, enhancing the collision and aggregation of oil mist particles with the filter fibers. A sealing skirt structure is provided on the outer edge of the valve plate, achieving self-sealing under pressure differential and oil film action, eliminating the need for rubber sealing rings and resulting in a simple and reliable structure. The device also includes an oil collection channel and a detachable filter element baffle for easy oil recovery and filter element maintenance. The overall structure is compact, easy to assemble, and features high-efficiency separation, low energy consumption, and good economic performance. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of a variable cross-section oil-gas separation structure proposed in an embodiment of this utility model;

[0015] Figure 2 This is a side cross-sectional view of the separation shell of a variable cross-section oil-gas separation structure proposed in an embodiment of the present invention;

[0016] Figure 3 This is a top sectional view of the separation shell of a variable cross-section oil-gas separation structure proposed in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the valve plate and sealing skirt of a variable cross-section oil-gas separation structure proposed in an embodiment of this utility model;

[0018] Figure 5 This is a top sectional view of the separation shell and valve plate of a variable cross-section oil-gas separation structure proposed in an embodiment of this utility model.

[0019] In the diagram: 1-mounting base, 2-spring, 3-valve plate, 4-separation filter element, 5-filter element baffle, 6-assembly buckle, 7-filter chamber, 8-separation housing, 9-baffle, 10-air outlet, 11-acceleration hole, 12-sealing skirt. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1 to 5A variable cross-section oil-gas separation structure includes a mounting base 1, on which a separation shell 8 is mounted. A valve plate 3 is mounted inside the separation shell 8 via a spring 2. Filter chambers 7 are provided on both outer walls of the separation shell 8. Separation filter elements 4 are provided inside the filter chambers 7. A filter element baffle 5 is snapped onto the side of the filter chamber 7 away from the separation shell 8. Acceleration holes 11 are provided on both outer walls of the separation shell 8. The acceleration holes 11 pass through the channel between the filter chambers 7 and the separation shell 8. A baffle 9 is provided at one end of the separation shell 8.

[0022] The mixed gas to be separated enters the interior of the separation housing 8 through the opening. Inside the separation housing 8, the mixed gas is compressed and accelerated by the acceleration hole 11 before entering the filter chamber 7. The accelerated high-speed airflow is directed towards the separation filter element 4. Under low-pass-through conditions, the pressure difference across the separation structure is small, less than 1200 Pa. The thrust of the spring 2 keeps the valve plate 3 close to the opening of the separation housing 8, allowing only a portion of the acceleration hole 11 to open for gas flow. This means the effective cross-section of the gas flow path is small, and the gas velocity through the acceleration hole 11 is low, but still within the optimal range for separation efficiency of the separation filter element 4. The gas passes through the separation filter... After filter element 4, most of the oil mist is captured and integrated into droplets. The droplets fall onto baffle 9 under gravity and flow back through the drainage channel, thus achieving oil-gas separation. Under high gas leakage conditions, the pressure difference before and after the separation structure increases rapidly. Under the action of the pressure difference, valve plate 3 moves inward along the axial direction of separation housing 8, compressing spring 2, causing more acceleration holes 11 in separation housing 8 to gradually open. The area of ​​acceleration holes 11 that can be used for mixed gas flow increases, the flow cross section of the separation structure expands, and the pressure difference gradually drops back to the target range (1200–1500 Pa), ensuring that the airflow velocity before the separation filter element 4 is constant, thereby avoiding the problem of decreased separation efficiency due to excessively fast airflow.

[0023] In a preferred embodiment of this utility model, the acceleration holes 11 on both sides of the separation shell 8 are staggered to create turbulence in the mixed gas as it passes through, thereby improving the oil-gas separation effect.

[0024] Acceleration holes 11 are respectively opened on the opposite side walls of the separation housing 8, and the acceleration holes 11 on adjacent sides are staggered in axial position, so that the mixed gas flow from both sides will generate mutual interference and convergence effect when entering the filter chamber 7.

[0025] The staggered arrangement creates a tangential velocity difference between two or more airflows in space, causing disturbances and rotations in the confluence area, thus forming a local turbulent zone inside the filter chamber 7. This turbulent state effectively and evenly distributes the airflow, preventing airflow concentration in a certain area from causing excessive local load on the filter element 4. On the other hand, the turbulent airflow can lengthen the movement path of oil mist particles, increasing the probability of collision between oil mist and the fibers of the separation filter element 4, making it easier for fine oil droplets to be captured and condensed.

[0026] Furthermore, the staggered acceleration holes 11 can also play a role in energy dispersion and pressure differential buffering under high flow conditions, preventing oil and gas penetration caused by the direct impact of local high-speed airflow on the separator filter element 4. This structure ensures overall flow capacity while achieving airflow homogenization and improved separation efficiency, thereby further enhancing the stability and adaptability of the oil and gas separation device of this utility model under different operating conditions.

[0027] In a preferred embodiment of this invention, a sealing skirt 12 is provided on the side of the valve plate 3, and the outer diameter of the sealing skirt 12 is larger than the inner diameter of the separation housing 8. When the mixed gas flows through the separation housing 8, a certain pressure difference is formed within the structure. Under the action of the pressure difference, the sealing skirt 12 is pushed against the inner wall of the separation housing 8, thereby forming a radially tight seal. In addition, a small amount of oil is distributed between the sealing surfaces during the separation process. This oil film further enhances the sealing adhesion under the action of the pressure difference, forming an oil film auxiliary sealing layer, effectively preventing gas leakage.

[0028] Because the sealing skirt 12 adopts a thin-walled structure (for example, a thickness of about 0.8 mm), it has a certain degree of flexible deformation capability, which can automatically adjust the contact pressure under different working conditions and maintain a stable sealing effect without the need for additional rubber sealing rings or other sealing elements.

[0029] In a preferred embodiment of this invention, the bottom of the filter chamber 7 is provided with several air outlets 10, through which the gas filtered by the separator filter element 4 is discharged. The multiple air outlets 10 are evenly distributed along the bottom of the filter chamber 7, ensuring uniform discharge of the separated gas and avoiding localized back pressure or airflow turbulence caused by a single outlet. This multi-point exhaust design helps maintain a stable pressure difference within the filter chamber, thereby keeping the airflow velocity on both sides of the separator filter element 4 within a reasonable range, further improving oil-gas separation efficiency and system stability.

[0030] In a preferred embodiment of this utility model, an oil collection channel is provided on one side of the filter chamber 7 to collect the oil that has fallen after being separated by the separator filter element 4, and to guide the separated oil back to the engine crankcase or the oil return system.

[0031] During the separation process, the oil mist in the mixed gas is captured by the separation filter element 4 and condenses into liquid oil droplets. Under the action of gravity, the oil droplets slide down the inner wall or guide surface of the filter chamber 7 and eventually flow into the oil collection channel. The oil collection channel can be a trough-shaped or tubular structure, and its bottom can be connected to the return oil pipeline to ensure that the oil is discharged smoothly without stagnation.

[0032] In a preferred embodiment of this utility model, the side of the filter element baffle 5 is provided with a mounting buckle 6, which is used to detachably engage and fix the filter chamber 7 with the side wall of the filter chamber 7.

[0033] The mounting clip 6 can be a flexible hook or flange structure, which cooperates with the corresponding groove on the side wall of the filter chamber 7. During installation, a slight squeeze achieves quick locking, and during disassembly, elastic deformation allows for easy release. This assembly structure eliminates the need for additional fasteners or seals, simplifying the assembly process while ensuring the sealing reliability and structural stability between the filter element baffle 5 and the filter chamber 7. Through this design, the filter element baffle 5 can be quickly installed and replaced, facilitating the maintenance and periodic cleaning of the filter element 4, thereby improving the maintainability and service life of the entire oil-gas separation device.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A variable cross-section oil-gas separation structure, comprising a mounting base (1), characterized in that, The mounting base (1) is provided with a separation housing (8). A valve plate (3) is installed inside the separation housing (8) by a spring (2). Both outer walls of the separation housing (8) are provided with filter chambers (7). A separation filter element (4) is provided inside the filter chamber (7). A filter element baffle (5) is snapped onto the side of the filter chamber (7) away from the separation housing (8). Both outer walls of the separation housing (8) are provided with acceleration holes (11). The acceleration holes (11) pass through the channel between the filter chamber (7) and the separation housing (8). A baffle (9) is provided at one end of the separation housing (8).

2. The variable cross-section oil-gas separation structure according to claim 1, characterized in that, The acceleration holes (11) on both sides of the separation shell (8) are staggered.

3. The variable cross-section oil-gas separation structure according to claim 1, characterized in that, The valve plate (3) is provided with a sealing skirt (12) on its side.

4. The variable cross-section oil-gas separation structure according to claim 1, characterized in that, The bottom of the filter chamber (7) is provided with several air outlets (10), and the gas filtered by the separation filter element (4) is discharged through the air outlets (10).

5. The variable cross-section oil-gas separation structure according to claim 1, characterized in that, An oil collection channel is provided on one side of the filter chamber (7) to collect the oil that has been separated and fallen by the separator filter element (4).

6. The variable cross-section oil-gas separation structure according to claim 1, characterized in that, The filter element baffle (5) is provided with mounting buckles (6) on its side.

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