A pre-separation assembly

Abstract

The utility model discloses a kind of pre-separation components, the component includes main unit, separation unit, coalescence backflow unit and mounting unit.Separation unit is arranged in the inside of main unit, including by staggered baffle constitutes Labyrinth baffle unit and by aperture plate and felt layer composite and become baffle structure unit, can carry out multistage gradient separation to crankcase blow-by gas, effectively intercepts oil drop from big to small.Coalescence backflow unit sets umbrella valve in the oil return channel of export side, changes airflow direction by its umbrella structure, makes the remaining oil drop carried in airflow collide to umbrella face and coalesce due to inertia, and oil drop after coalescence flows down along umbrella face, ensure that the oil drop separated out can be under the action of gravity smoothly, unidirectionally backflow to crankcase.Installing unit is fixed to cylinder head cover by gluing and bolt with component.The utility model structure is compact, degree of integration is high, significantly improves oil-gas separation efficiency and engine reliability, while with low cost, easy assembly advantage.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a pre-separation component. Background Technology

[0002] During engine operation, some combustible mixture and combustion products from the cylinder can seep into the crankcase through the piston ring gaps. This blow-by not only increases the internal pressure of the crankcase, but the fuel components and water it contains also dilute the engine oil, while the acidic substances and other contaminants it contains accelerate oil deterioration and cause corrosion and rust on internal engine components, seriously affecting the engine's reliability, service life, and performance.

[0003] To address these issues, modern engines typically integrate an oil-gas separator within the cylinder head cover. This separator separates crankcase blow-by gases, extracts oil droplets, and guides them back to the oil pan. The separated gases are then introduced into the intake system for re-combustion. Currently, most common separators employ a labyrinthine structure, utilizing the impact principle for separation. However, many existing pre-separation structures suffer from insufficient separation efficiency, particularly in capturing fine oil droplets. This results in some oil still entering the engine's intake system with the gas, leading to excessive oil consumption and impacting combustion efficiency. Furthermore, some separator designs are not compact enough, making efficient arrangement within the limited space of the cylinder head cover difficult. Additionally, if the separated oil cannot be reliably and promptly returned to the crankcase, the stability of the separation effect is affected.

[0004] Therefore, there is an urgent need for a pre-separation component that is compact, highly efficient in separation, and can ensure smooth gas flow in order to improve the overall performance and reliability of the engine. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Therefore, to solve the above-mentioned technical problems, this utility model provides the following technical solution: a pre-separation component, comprising:

[0007] The main unit constitutes the basic structure of the pre-separated components;

[0008] A separation unit, located inside the main unit, is used for multi-stage separation of the oil-gas mixture, including:

[0009] The labyrinth baffle unit, located on the oil and gas inlet side, is used to intercept large oil droplets by accelerating and impacting the airflow.

[0010] A baffle structure unit, located downstream of the labyrinth baffle unit, includes a perforated plate and a felt layer for intercepting fine oil droplets;

[0011] A coalescing reflux unit is located downstream of the separation unit and includes an umbrella valve. The umbrella-shaped structure of the umbrella valve is used to change the airflow direction, so that the remaining oil droplets carried in the airflow collide with the umbrella surface due to inertia and coalesce. The coalesced oil droplets flow down along the umbrella surface.

[0012] The mounting unit is located on the outer periphery of the main unit and is used to fix the pre-separation assembly to the engine cylinder head cover.

[0013] In a preferred embodiment of the pre-separation component described in this utility model, the main body unit is an integrally molded plastic part.

[0014] In a preferred embodiment of the pre-separation component described in this utility model, the oil and gas inlet and outlet are arranged asymmetrically to optimize the airflow direction and reduce eddies.

[0015] In a preferred embodiment of the pre-separation component of this utility model, the main body unit has a recessed transition area between the labyrinth baffle unit and the baffle structure unit to buffer airflow and reduce pressure loss.

[0016] In a preferred embodiment of the pre-separation component described in this utility model, the labyrinth baffle unit is composed of plate-like structures arranged alternately on the left and right sides to form a meandering oil and gas channel, thereby extending the flow path and enhancing the separation effect.

[0017] In a preferred embodiment of the pre-separation component of this utility model, the main unit is provided with an oil guiding slope on the outlet side of the baffle structure unit, and the bottom of the oil guiding slope is connected to an oil return channel for collecting oil droplets separated from the umbrella valve and the baffle structure unit and guiding them back to the crankcase.

[0018] In a preferred embodiment of the pre-separation component of this utility model, a plurality of positioning inserts and limiting abutments are provided on the side of the felt layer near the perforated plate.

[0019] The perforated plate is provided with corresponding positioning holes for the positioning insert to be inserted;

[0020] The length of the positioning insert is greater than that of the limiting abutment. When the positioning insert is inserted into place, the end face of the limiting abutment abuts against the surface of the perforated plate.

[0021] In a preferred embodiment of the pre-separation component of this utility model, the perforated plate is provided with regularly distributed through holes, the felt layer is provided with regularly distributed conical protrusions, and a gap is left between the protrusions and the through holes.

[0022] In a preferred embodiment of the pre-separation component described in this utility model, the mounting unit includes an adhesive surface arranged on the upper surface of the edge of the main unit, and mounting holes are provided at the corners of the adhesive surface, which is fixed to the cylinder head cover by adhesive and bolts.

[0023] The beneficial effects of this utility model are:

[0024] 1. This utility model sets up a multi-stage separation unit. First, the labyrinth baffle unit intercepts large oil droplets by accelerating impact. Then, the unique "perforated plate + felt layer" baffle structure unit efficiently adsorbs and intercepts fine oil droplets, realizing gradient-type efficient separation of oil droplets. This fundamentally improves the oil-gas separation efficiency, helps reduce oil consumption, and improves engine fuel economy.

[0025] 2. The entire component of this utility model is made of one-piece molded plastic parts, highly integrating the labyrinth, baffle structure, flow channel, and mounting part into a compact main unit. This design is not only simple to process, lightweight, and low in cost, but its overall structural dimensions are also perfectly adapted to the limited space of the cylinder head cover, without requiring major modifications to the engine cylinder head layout, making it easy to promote and apply.

[0026] 3. By setting up an umbrella valve structure, this utility model performs final fine separation on the gas after the first two stages of separation, effectively coalescing and capturing the remaining fine oil mist, further reducing the oil content in the outlet gas, thereby indirectly reducing the risk of gas flow obstruction due to oil carryover and improving separation efficiency.

[0027] 4. The asymmetrical layout of the oil and gas inlet and outlet of this utility model optimizes the internal airflow field and reduces eddy current generation; while the concave transition area effectively buffers the airflow velocity and reduces pressure loss. These designs work together to improve separation efficiency while reducing the negative impact on engine back pressure, which is beneficial to improving the overall performance of the engine. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0029] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0030] Figure 2 This is a top view of the structure of this utility model.

[0031] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0032] In the diagram: 100, main unit; 101, concave transition area; 102, oil and gas inlet; 103, outlet; 104, oil guide slope;

[0033] 200. Separation unit; 201. Maze baffle unit; 201a. Plate-like structure; 202. Baffle structure unit; 202a. Perforated plate; 202a-1. Positioning insertion hole; 202a-2. Through hole; 202b. Felt layer; 202b-1. Positioning insert; 202b-2. Limiting stop bar; 202b-3. Conical columnar protrusion;

[0034] 300. Coalescence reflux unit; 301. Umbrella valve; 302. Oil return channel;

[0035] 400. Mounting unit; 401. Adhesive-coated surface; 402. Mounting hole;

[0036] 500. Oil and gas passage. Detailed Implementation

[0037] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0040] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0041] Example 1

[0042] Reference Figures 1-3 The first embodiment of this utility model provides a pre-separation component, which is fixedly installed in the inner cavity of the engine cylinder head cover by the mounting unit 400. Its structure is compact and does not occupy extra space.

[0043] See Figure 1 The pre-separation assembly mainly includes a main body unit 100, a separation unit 200, a coalescing reflux unit 300, and an installation unit 400.

[0044] The main unit 100 constitutes the basic structure and shell of the entire component, and an oil and gas channel 500 is formed inside it for the oil and gas mixture to pass through.

[0045] In this embodiment, the main body unit 100 is preferably made of engineering plastic by injection molding, which makes its components simple to process, lightweight, low cost and corrosion resistant.

[0046] The main unit 100 is defined with an oil and gas inlet 102 and an oil and gas outlet 103 (from which separated oil and gas are discharged). The oil and gas inlet 102 and the oil and gas outlet 103 are arranged asymmetrically (see [reference]). Figure 1 This design optimizes the airflow direction within the component, guiding the oil and gas flow more smoothly through the separation unit, effectively reducing the generation of eddies, thereby reducing pressure loss and improving separation efficiency.

[0047] The separation unit 200 is disposed in the internal flow channel of the main unit 100 and is used to perform multi-stage and efficient separation of crankcase blow-by gas entering from the oil and gas inlet 102; the separation unit 200 includes a labyrinth baffle unit 201 and a baffle structure unit 202.

[0048] Furthermore, the labyrinth baffle unit 201 is located on one side of the oil and gas inlet 102, and is composed of multiple plate-like structures 201a arranged alternately on the left and right sides (see...). Figure 1 and 3This design creates a meandering oil and gas channel 500 within the flow path. When the high-speed oil and gas mixture enters, it first impacts the first-stage baffle, and some large oil droplets are directly intercepted and separated due to inertia. The airflow continuously accelerates and changes direction in the meandering oil and gas channel 500, and continues to impact subsequent baffles, thereby achieving effective interception of large oil droplets step by step.

[0049] Furthermore, this embodiment also provides a recessed transition region 101 downstream of the labyrinth baffle unit 201. This region serves as an airflow buffer zone, which can slow down the flow rate of the oil-gas mixture after the accelerated impact of the labyrinth and stabilize the pressure, creating favorable conditions for the next stage of fine separation and further reducing system pressure loss.

[0050] Furthermore, the baffle structure unit 202, located after the transition region 101, is a key component for fine separation. It mainly consists of a perforated plate 202a and a felt layer 202b closely attached to it. The pre-treated oil and gas flow first impacts the perforated plate 202a, whose surface has regularly distributed through holes 202a-2 (see...). Figure 1 The airflow is diffused and initially sieved; then, the airflow impacts multiple regularly distributed conical protrusions 202b-3 on the felt layer 202, and then penetrates the felt layer 202b. The dense porous fiber structure of the felt can efficiently adsorb and intercept extremely fine oil particles and droplets, significantly improving the separation ability of tiny oil droplets, thereby helping to improve the fuel efficiency of the engine.

[0051] The coalescence reflux unit 300 is located downstream of the baffle structure unit 202 and is a key component for final fine separation and oil recovery. Its core is an umbrella valve 301, whose umbrella-shaped structure faces the direction of the airflow exiting the baffle structure unit 202. When gas carrying extremely fine oil droplets that were not completely separated in the first two stages flows towards the umbrella valve, the conical surface of the umbrella valve 301 forces the airflow to change direction, flowing upwards or outwards. Because the density and inertia of the oil droplets are much greater than those of the gas, they cannot quickly change direction with the gas and thus violently impact the umbrella surface of the umbrella valve 301 and adhere to it. The oil droplets adhering to the umbrella surface continuously coalesce, eventually merging into larger oil droplets, which flow down the umbrella surface under gravity.

[0052] Furthermore, in this embodiment, on the oil and gas outlet side of the baffle structure unit 202, an oil guiding slope 104 is designed on the wall of the main unit 100, so that the intercepted oil droplets collect downwards under the action of gravity, and the collected oil can flow smoothly along this slope to the oil return channel 105 connected at its bottom, and guide the collected oil back to the engine crankcase.

[0053] It should be noted that the umbrella valve 301 described in this embodiment is primarily for inertial separation rather than check valve operation. If the engine operating conditions cause an abnormal increase in crankcase pressure, and there is a risk of gas escaping in the reverse direction through the oil return channel 105, the ultimate solution to this risk usually relies on other dedicated check valves or pressure regulating devices in the engine's entire crankcase ventilation (PCV) system. The core value of this solution lies in providing an efficient and compact multi-stage separation solution.

[0054] The mounting unit 400 is used to reliably fix the entire pre-separation assembly to the cylinder head cover; a continuous adhesive surface 401 is provided around the edge of the upper surface of the main unit 100; mounting holes 402 (such as bolt holes) are provided at the four corners of the adhesive surface 401.

[0055] During assembly, sealant is first applied to the adhesive surface 401, and then four bolts are screwed into the corresponding threaded holes on the cylinder head cover through the mounting holes 402 to secure the component. The dual fixing and sealing method of adhesive application and bolts used in this embodiment ensures the firmness of the component installation and the reliability of the interface sealing, preventing oil and gas leakage.

[0056] Working principle: When the engine is running, crankcase gas containing oil droplets (such as...) blows in. Figure 2 The airflow path (indicated by the middle arrow) enters the pre-separation assembly from the oil and gas inlet 102; the airflow first passes through the labyrinth baffle unit 201, continuously impacting the baffles in the meandering channel, where most of the large oil droplets are separated due to inertia (e.g., ...). Figure 2 (The oil droplet path is shown by the arrow on the oil and gas outlet side), adhering to the baffle wall and dripping downwards;

[0057] Subsequently, the airflow is buffered by the concave transition region 101 and then enters the baffle structure unit 202 (e.g., Figure 2 (As indicated by the arrow above); the airflow penetrates the perforated plate 202a and the felt layer 202b, where fine oil droplets are efficiently captured and intercepted; the separated clean gas (such as...) Figure 2 The gas path (indicated by the arrow on the oil and gas outlet side) is discharged from oil and gas outlet 103 and enters the next stage of processing system or ventilation system.

[0058] All the separated oil droplets eventually converge under gravity, and the airflow ultimately passes through the coalescing and reflux unit 300 composed of umbrella valve 301. The remaining oil droplets are captured by inertial collisions onto the umbrella surface, achieving final separation. The separated clean gas is discharged from the oil-gas outlet 103. All the separated oil droplets eventually converge on the oil guide slope 104 and flow back to the engine crankcase through the oil return channel 105 (e.g., ...). Figure 3 (The return path is indicated by the arrow inside the return oil channel 105).

[0059] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pre-separation component, characterized in that: include: The main unit (100) constitutes the basic structure of the pre-separated assembly; A separation unit (200), disposed inside the main unit (100), is used for multi-stage separation of the oil-gas mixture, including: The labyrinth baffle unit (201), located on the oil and gas inlet side, is used to intercept large oil droplets by accelerating and impacting the airflow; The baffle structure unit (202), located downstream of the labyrinth baffle unit (201), includes a perforated plate (202a) and a felt layer (202b) for intercepting fine oil droplets; A coalescing reflux unit (300) is located downstream of the separation unit (200) and includes an umbrella valve (301). The umbrella-shaped structure of the umbrella valve (301) is used to change the airflow direction, so that the remaining oil droplets carried in the airflow collide with the umbrella surface due to inertia and coalesce. The coalesced oil droplets flow down along the umbrella surface. An installation unit (400) is disposed on the outer periphery of the main body unit (100) for fixing the pre-separation assembly to the engine cylinder head cover.

2. The pre-separation component as described in claim 1, characterized in that: The main body unit (100) has a recessed transition area (101) between the labyrinth baffle unit (201) and the baffle structure unit (202) to buffer airflow and reduce pressure loss.

3. A pre-separation component as described in claim 1, characterized in that: The labyrinth baffle unit (201) consists of plate-like structures (201a) arranged alternately on the left and right sides, forming a meandering oil and gas channel (500) to extend the flow path and enhance the separation effect.

4. A pre-separation component as described in claim 1, characterized in that: The main unit (100) has an oil guide slope (104) on the outlet side of the baffle structure unit (202). The bottom of the oil guide slope (104) is connected to an oil return channel (302) for collecting oil droplets separated from the umbrella valve (301) and the baffle structure unit (202) and guiding them back to the crankcase.

5. A pre-separation component as described in claim 1, characterized in that: The felt layer (202b) is provided with a plurality of positioning inserts (202b-1) and limiting abutments (202b-2) on the side near the perforated plate (202a); The perforated plate (202a) is provided with a positioning hole (202a-1) for the positioning insert (202b-1) to be inserted; The length of the positioning insert (202b-1) is greater than that of the limiting abutment (202b-2). When the positioning insert (202b-1) is inserted into place, the end face of the limiting abutment (202b-2) abuts against the surface of the perforated plate (202a).

6. A pre-separation component as described in claim 1, characterized in that: The perforated plate (202a) has regularly distributed through holes (202a-2), and the felt layer (202b) has regularly distributed conical protrusions (202b-3), with a gap between the protrusions (202b-3) and the through holes (202a-2).

7. A pre-separation component as described in claim 1, characterized in that: The mounting unit (400) includes an adhesive surface (401) arranged on the upper surface of the edge of the main unit (100), and mounting holes (402) are provided at the corners of the adhesive surface (401) for fixing to the cylinder head cover by adhesive and bolts.

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