External labyrinth oil-gas pre-separator

Abstract

The present invention discloses an external labyrinth oil-gas pre-separator, which is arranged on a cylinder cover plate. The external labyrinth oil-gas pre-separator includes a pre-filter pad, a pre-filter shell, a plurality of transverse baffles and a longitudinal baffle. The pre-filter pad is arranged close to the cylinder cover plate; the pre-filter shell is buckled on the pre-filter pad, and the pre-filter pad and the pre-filter shell form a relatively closed accommodation space with a certain thickness; a plurality of transverse baffles are arranged on the front side walls of the pre-filter pad and the pre-filter shell in sequence in an interlaced and parallel manner, and a plurality of transverse baffles form an S-shaped channel in the accommodation space; the longitudinal baffle is arranged at the rightmost end of the front side wall of the pre-filter shell, and is arranged vertically with the plurality of transverse baffles, the longitudinal baffle is connected to the rightmost transverse baffle among the plurality of transverse baffles, and forms a cavity with the upper side wall and the right side wall of the pre-filter shell, and the cavity is connected with the S-shaped channel. The external labyrinth oil-gas pre-separator of the present invention can realize rapid and smooth oil-gas separation through the internal S-shaped channel.

Description

Technical Field

[0001] The invention relates to the field of engines, in particular to an external labyrinth type oil-gas pre-separator. Background Art

[0002] When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will leak into the crankcase through the gap between the piston group and the cylinder to a certain extent, causing blowby. The components of blowby are unburned fuel gas, water vapor and exhaust gas, which will dilute the engine oil, reduce the performance of the engine oil, and accelerate the oxidation and deterioration of the engine oil. Water vapor condenses in the engine oil to form sludge and block the oil circuit; acidic gas in the exhaust gas mixes into the lubrication system, causing corrosion and accelerated wear of engine parts; blowby will also cause the crankcase pressure to be too high and damage the crankcase seal, causing the engine oil to leak and lose.

[0003] In order to prevent the crankcase pressure from being too high, extend the service life of the engine oil, reduce the wear and corrosion of parts, 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 designed during the automobile engine design process.

[0004] The oil-gas separator is an important part of the crankshaft ventilation system. The function of the oil-gas separator is to separate the engine oil in the crankcase emissions from the mixed gas and return it to the oil pan. The existing oil-gas separators are roughly divided into several types: gravity separation type, collision coalescence type, cyclone separation type, and expansion separation type. Considering the factors of high efficiency and cost, the combination of pre-filter + oil-gas separator is usually used on the engine.

[0005] There are many types of pre-filters, the most common of which are external type and integrated type with engine cover. The external type has lower cost but occupies more space and is difficult to arrange; the integrated type has a more complex structure and low oil return efficiency. When the oil-gas separator is actually arranged in the engine, it is arranged low due to the lack of suitable installation holes or spatial interference, which is prone to the risk of blockage and oil leakage.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The object of the present invention is to provide an external labyrinth oil-gas pre-separator, which can achieve rapid and smooth oil-gas separation through an internal S-shaped channel.

[0008] In order to achieve the above-mentioned purpose, the present invention provides an external labyrinth oil-gas pre-separator, which is arranged on the cylinder cover plate, and the external labyrinth oil-gas pre-separator includes a pre-filter pad, a pre-filter shell, a plurality of transverse baffles and a longitudinal baffle. The pre-filter pad is arranged close to the cylinder cover plate; the pre-filter shell is buckled on the pre-filter pad, and the pre-filter pad and the pre-filter shell form a relatively closed accommodation space with a certain thickness; a plurality of transverse baffles are arranged on the front side walls of the pre-filter pad and the pre-filter shell in sequence and in parallel, and the plurality of transverse baffles form an S-shaped channel in the accommodation space; the longitudinal baffle is arranged at the rightmost end of the front side wall of the pre-filter shell, and is arranged vertically with the plurality of transverse baffles, the longitudinal baffle is connected to the rightmost transverse baffle among the plurality of transverse baffles, and forms a cavity with the upper side wall and the right side wall of the pre-filter shell, and the cavity is connected with the S-shaped channel.

[0009] In a preferred embodiment, the left end of the pre-filter pad has a square through hole, which is connected to the accommodating space and the oil-gas mixture inlet and the oil return port on the cylinder cover plate at the same time.

[0010] In a preferred embodiment, a pipe joint is provided at the rightmost end of the upper side wall of the pre-filter housing and is communicated with the cavity.

[0011] In a preferred embodiment, the lower side wall of the pre-filter housing is an inclined surface, and the right end of the lower side wall is higher than the left end.

[0012] In a preferred embodiment, the length of the plurality of transverse baffles is greater than 50% of the thickness of the accommodating space.

[0013] Compared with the prior art, the external labyrinth oil-gas pre-separator of the present invention has the following beneficial effects: the bottom of the oil-gas pre-separator is cleverly designed to be an inclined surface, so that the separated oil can flow back to the oil pan smoothly, solving the problems of oil return blockage and oil leakage; at the same time, the oil-gas mixture inlet and the oil return port of the oil-gas pre-separator are designed at the same port, reducing the location layout of one oil return port and the layout of related pipelines, making the structure more compact and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a top cross-sectional schematic diagram of an external labyrinth oil-gas pre-separator according to an embodiment of the present invention;

[0015] Figure 2 1 is a schematic front cross-sectional view of an external labyrinth-type oil-gas pre-separator according to an embodiment of the present invention.

[0016] Description of main reference numerals:

[0017] 1-cylinder cover, 2-pre-filter housing, 3-first transverse baffle, 4-second transverse baffle, 5-third transverse baffle, 6-fourth transverse baffle, 7-fifth transverse baffle, 8-sixth transverse baffle, 9-longitudinal baffle, 10-pre-filter pad, 11-pipe joint, 12-oil-gas mixture inlet and oil return port, A-oil-gas mixture. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0019] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0020] like Figure 1 to Figure 2 As shown, Figure 1 is a top cross-sectional schematic diagram of an external labyrinth oil-gas pre-separator according to an embodiment of the present invention; Figure 21 is a schematic diagram of a front cross-sectional view of an external labyrinth oil-gas pre-separator according to an embodiment of the present invention. An external labyrinth oil-gas pre-separator according to a preferred embodiment of the present invention is arranged on a cylinder block cover plate 1, and the external labyrinth oil-gas pre-separator includes a pre-filter pad 10, a pre-filter housing 2, a plurality of transverse baffles (such as a first transverse baffle 3, a second transverse baffle 4, a third transverse baffle 5, a fourth transverse baffle 6, a fifth transverse baffle 7, and a sixth transverse baffle 8) and a longitudinal baffle 9. The pre-filter pad 10 is arranged close to the cylinder cover plate 1; the pre-filter housing 2 is buckled on the pre-filter pad 10, and the pre-filter pad 10 and the pre-filter housing 2 form a relatively closed accommodating space with a certain thickness; multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) are arranged in sequence on the front side wall of the pre-filter pad 10 and the pre-filter housing 2 in an interlaced and parallel manner, and the length of the multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) is greater than 50% of the thickness of the accommodating space, so that the multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) can be ensured. The fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) form an S-shaped channel in the accommodating space; the longitudinal baffle 9 is arranged at the rightmost end of the front side wall of the pre-filter housing 2, and is vertically arranged with multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8), and the longitudinal baffle 9 is connected to the rightmost transverse baffle (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) among the multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8), and forms a cavity with the upper side wall and the right side wall of the pre-filter housing 2, and the cavity is communicated with the S-shaped channel.

[0021] In this embodiment, the pre-filter pad 10 is substantially in the shape of a right-angled trapezoid, and the shape of the pre-filter housing 2 matches the shape of the pre-filter pad 10. The external labyrinth oil-gas pre-separator is arranged on the cylinder block cover 1, and the hypotenuse of the right-angled trapezoid is arranged at the bottom, so that the bottom of the external labyrinth oil-gas pre-separator is formed to be higher on the right and lower on the left. The shape of the pre-filter pad 10 and the pre-filter housing 2 is not used to limit the present invention, but in fact ensures that the bottom of the external labyrinth oil-gas pre-separator of the present invention is high on one side and low on the other side, and the air outlet is higher than the oil return port.

[0022] In this embodiment, the left end of the pre-filter pad 10 has a square through hole, which is connected to the accommodating space and the oil-gas mixture inlet and the oil return port 12 on the cylinder cover 1. The rightmost end of the upper side wall of the pre-filter housing 2 is provided with a pipe joint 11, which is connected to the cavity.

[0023] In some embodiments, the first to seventh transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) and the longitudinal baffle 9 can be first welded into a whole with the pre-filter housing 2 and the pre-filter pad 10, and then welded to the cylinder cover plate 1. This can reduce the deformation and make it easier to meet the installation accuracy requirements.

[0024] In actual operation, the oil-gas mixture A (such as Figure 1 and Figure 2 The oil (as shown by the black arrow in the figure) enters the oil-gas pre-separator through the oil-gas mixture inlet and the oil return port 12 on the cylinder cover 1, and then passes through the S-shaped channel formed by multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) and enters the longitudinal baffle 9 to connect with the rightmost transverse baffle (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8) among the multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8), and forms a cavity with the upper side wall and the right side wall of the pre-filter housing 2, and finally flows out from the pipe joint 11 into the oil-gas separator. When the oil-gas mixture A passes through the S-shaped channel formed by multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8), it collides and contacts with the multiple transverse baffles (such as the first transverse baffle 3, the second transverse baffle 4, the third transverse baffle 5, the fourth transverse baffle 6, the fifth transverse baffle 7, and the sixth transverse baffle 8). The oil in the oil-gas mixture A will be separated along the baffle wall and drip onto the lower side wall of the pre-filter housing 2. Since the lower side wall of the pre-filter housing 2 is a slope with a higher right side and a lower left side, the separated oil will flow back to the oil pan along the lower side wall of the pre-filter housing 2 through the oil return port.

[0025] In summary, the external labyrinth oil-gas pre-separator of the present invention has the following advantages: the bottom of the oil-gas pre-separator is cleverly designed to be an inclined surface, so that the separated oil can flow back to the oil pan smoothly, solving the problems of oil return blockage and oil leakage; at the same time, the oil-gas mixture inlet and the oil return port of the oil-gas pre-separator are designed at the same port, reducing the location layout of one oil return port and the layout of related pipelines, making the structure more compact and simple.

[0026] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An external labyrinth oil-gas pre-separator, arranged on the cylinder cover, characterized in that: The external labyrinth oil-gas pre-separator comprises: A pre-filter pad, which is arranged closely against the cylinder body cover plate; A pre-filter housing, which is buckled onto the pre-filter pad, and the pre-filter pad and the pre-filter housing form a relatively closed accommodation space with a certain thickness; a plurality of transverse baffles, which are sequentially staggered and parallelly arranged on the pre-filter pad and the front side wall of the pre-filter housing, and the plurality of transverse baffles form an S-shaped channel in the accommodating space; and a longitudinal baffle, which is arranged at the rightmost end of the front side wall of the pre-filter housing and is arranged perpendicularly to the plurality of transverse baffles, the longitudinal baffle is connected to the rightmost transverse baffle of the plurality of transverse baffles, and forms a cavity with the upper side wall and the right side wall of the pre-filter housing, and the cavity is communicated with the S-shaped channel; The left end of the pre-filter pad has a square through hole, and the square through hole is connected to the accommodating space and the oil-gas mixture inlet and the oil return port on the cylinder cover plate at the same time; The lower side wall of the pre-filter housing is an inclined surface, and the right end of the lower side wall is higher than the left end; wherein the length of the plurality of transverse baffles is greater than 50% of the thickness of the accommodating space; There is no gap between the bottom edges of the plurality of transverse baffles and the lower side wall of the pre-filter housing.

2. The external labyrinth oil-gas pre-separator according to claim 1, characterized in that: A pipe joint is provided at the rightmost end of the upper side wall of the pre-filter housing and is communicated with the cavity.

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