Pre-separation system of oil-gas separator and oil-gas separator

Abstract

The invention provides a pre-separation system of an oil-gas separator and the oil-gas separator, and belongs to the technical field of automobile parts, the pre-separation system comprises a shell, a capacity expansion cavity, an impact cavity, a climbing cavity and a falling cavity are sequentially arranged along a separation path of an oil-gas mixture, and the capacity expansion cavity communicates with the impact cavity through a drainage channel; the impact chamber and the climbing chamber are arranged side by side, and the climbing chamber and the falling chamber are separated through a partition plate, so that the climbing chamber and the falling chamber are spliced to form a U-shaped structure with a downward opening. Requirements on environmental protection, emission and safety of a vehicle are met through reasonable arrangement, the pre-separation system is compact in structural design and higher in oil-gas separation efficiency, the recovery rate of engine oil and the recycling degree of waste gas are higher, and environmental protection and resource saving are better facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive parts, and relates to a pre-separation system, in particular to a pre-separation system for an oil-gas separator and an oil-gas separator. Background Art

[0002] The internal structure of the oil-gas separator in the engine crankcase ventilation system is divided into two separation structures: pre-separation and fine-separation. The current development trend of engines is towards miniaturization and lightweight design, which limits the space of the pre-separation structure. However, the traditional design concepts of mazes or long channels with attached oil droplets cannot be widely applied due to technical drawbacks such as limited space in the pre-separation structure, a large number of required parts, complex structural arrangements, and high costs.

[0003] Patent Application No. 202020290323.1 discloses a pre-separation structure for an oil-gas separator and a vehicle having the same. The pre-separation structure of the oil-gas separator includes: an upper housing, a lower housing, and a partition plate. The partition plate is disposed between the upper housing and the lower housing; there is a gap for oil and gas to pass between the left end of the partition plate and the inner cavity of the upper housing. A first vertical plate is provided in the middle of the partition plate. The upper end of the first vertical plate is installed in the installation groove on the inner side top wall of the upper housing. Small holes are provided on the first vertical plate. The first vertical plate divides the inner cavity of the upper housing into an upper half pre-separation chamber on the left side and an upper half fine-separation chamber on the right side. A bent portion protruding upward is provided in the middle of the partition plate located below the upper half pre-separation chamber.

[0004] However, the oil-gas mixture in this patent has a relatively long flow path in the pre-separation structure, resulting in relatively low working efficiency and a relatively complex structure.

[0005] Patent Application No. 202121903368.0 discloses an oil-gas separation device. The oil-gas separation device includes: a housing, an oil guiding channel, and an oil-gas separation component. An air inlet and an air outlet are respectively provided in the upper part of the housing, and an oil outlet is provided in the lower part of the housing; the oil guiding channel is U-shaped and disposed in the lower part of the housing. One end of the oil guiding channel is provided with an inlet, and the other end of the oil guiding channel is provided with an outlet. The outlet is communicated with the oil outlet. Among them, the height of the inlet is higher than the height of the outlet; the oil-gas separation component is disposed in the upper part of the housing, and the oil-gas separation component corresponds to the air inlet, the air outlet, and the inlet respectively.

[0006] However, when the oil-gas mixture enters from the inlet in this patent, due to the presence of the first separation baffle and the second separation baffle, vortexes of air flow are likely to occur, which is not conducive to the separation of the oil-gas mixture. Summary of the Invention

[0007] The object of the present invention is to address the above problems existing in the prior art and propose a pre-separation system for an oil-gas separator with a simple structure and better separation effect.

[0008] The object of the present invention can be achieved by the following technical solutions: A pre-separation system for an oil-gas separator, comprising: A housing, which is sequentially provided with an expansion chamber, an impact chamber, a climbing chamber, and a falling chamber along the separation path of the oil-gas mixture. The expansion chamber is connected to the impact chamber through a drainage channel. The impact chamber and the climbing chamber are arranged side by side. The climbing chamber and the falling chamber are separated by a partition, so that the climbing chamber and the falling chamber are spliced to form a U-shaped structure with the opening facing downwards; Wherein, the expansion chamber is connected to the intake end, and the falling chamber is connected to the outlet end. The oil-gas mixture enters the impact chamber from the expansion chamber from top to bottom. The oil-gas mixture overflowing from the impact chamber enters the climbing chamber, and after passing over the connection position between the climbing chamber and the falling chamber from bottom to top, it is discharged from the outlet end through the falling chamber from top to bottom; The flow rate of the oil-gas mixture in the expansion chamber is greater than that in the impact chamber; the flow rate of the oil-gas mixture in the impact chamber is greater than that in the climbing chamber; the flow rate of the oil-gas mixture in the climbing chamber is greater than that in the falling chamber.

[0009] In the above-mentioned pre-separation system of the oil-gas separator, the expansion chamber includes a side part formed by splicing multiple side plates end to end to form a closed structure, and a bottom plate for sealing one end of the side part. The other end of the side part is the intake end, and the bottom plate is obliquely arranged, wherein the bottom plate is inclined along the direction close to the intake end.

[0010] In the above-mentioned pre-separation system of the oil-gas separator, on the upper and lower sides of one side plate along the direction of the separation path of the oil-gas mixture, there are respectively provided bosses, namely a first boss and a second boss. A first through groove is provided on the first boss, and a second through groove is provided on the second boss. The first through groove is connected to the second through groove to form a drainage channel, wherein the axial direction of the first through groove forms a preset angle with the axial direction of the second through groove.

[0011] In the above-mentioned pre-separation system of the oil-gas separator, the side of the first boss away from the bottom plate is obliquely arranged, and the side of the second boss away from the bottom plate is flat.

[0012] In the above-mentioned pre-separation system of the oil-gas separator, both the first through groove and the second through groove are arranged as waist-shaped holes, and the ratio of the area of the waist-shaped holes to the area of the bottom plate is between 1:1.5 and 1:2.

[0013] In the above-mentioned pre-separation system of the oil-gas separator, a platform is arranged in the impact chamber, and multiple convex ribs are arranged on the platform, wherein the distance between any two adjacent convex ribs is equal.

[0014] In the pre-separation system of the above-mentioned oil-gas separator, the convex ribs are arranged with variable diameters, and the width of the convex ribs on the side close to the bottom plate is greater than the width of the convex ribs on the side close to the air inlet end. Among them, the variable diameter of the convex ribs is arranged in a gradual change manner.

[0015] In the pre-separation system of the above-mentioned oil-gas separator, the gap between two adjacent convex ribs is between 2 and 3 mm.

[0016] In the pre-separation system of the above-mentioned oil-gas separator, there is a height difference between the lowest end of the climbing chamber and the surface where the convex ribs are located on the platform.

[0017] In the pre-separation system of the above-mentioned oil-gas separator, one end of the climbing chamber connected to the falling-back chamber is arranged in a necked-down manner.

[0018] In the pre-separation system of the above-mentioned oil-gas separator, the two side walls of the climbing chamber are respectively the partition board and the side board of the expansion chamber, and the partition board includes a first end and a second end, and a necked-down part is formed by the first end tilting along the direction close to the side board.

[0019] In the pre-separation system of the above-mentioned oil-gas separator, the partition board includes a first partition board and a second partition board which are integrally arranged. The first partition board tilts along the direction close to the side board, and the second partition board tilts along the direction away from the side board, so that the space area formed between the first partition board and the side board is smaller than the space area formed between the second partition board and the side board. Among them, the oil-gas mixture overflowing from the impact chamber first enters the space area between the second partition board and the side board, and then climbs into the space area between the first partition board and the side board.

[0020] In the pre-separation system of the above-mentioned oil-gas separator, the air outlet end is arranged at the bottom of the falling-back chamber, and the oil-gas mixture entering the falling-back chamber is discharged from the air outlet end from top to bottom in an extrusion manner.

[0021] In the pre-separation system of the above-mentioned oil-gas separator, the cross-sectional area of the falling-back chamber is arranged in an equal cross-section manner.

[0022] In the pre-separation system of the above-mentioned oil-gas separator, a filter screen plate is arranged at one or more positions of the air inlet end, the first through groove, the second through groove, the connection between the climbing chamber and the falling-back chamber, or the air outlet end.

[0023] The present invention also provides an oil-gas separator, including the above-mentioned pre-separation system.

[0024] Compared with the prior art, the beneficial effects of the present invention: (1) The pre-separation system of an oil-gas separator provided by the present invention meets the requirements of vehicles in terms of environmental protection, emissions, and safety through reasonable layout. Moreover, the pre-separation system has a compact structure design, higher oil-gas separation efficiency, and thus higher oil recovery rate and degree of waste gas reuse, which is more conducive to environmental protection and resource conservation. (2) By expanding the chamber, on the one hand, the oil-gas mixture collides with the chamber wall of the expansion chamber, causing the oil droplets in the oil-gas mixture to flow down along the chamber wall. On the other hand, it can slow down the flow rate of the oil-gas mixture, extend the time of the oil-gas mixture in the expansion chamber, and ensure that the oil-gas mixture can contact the chamber wall in the expansion chamber as much as possible to achieve the separation of the oil-gas mixture. (3) Since the bottom plate is inclined, when the oil-gas mixture collides with the bottom plate, it will deflect or scatter in direction. Moreover, the oil-gas mixture contains oil molecules, and the impact causes the oil molecules in the oil-gas mixture to separate from the gas molecules, enabling the oil molecules to adhere to the side plate or the bottom plate after the impact and then flow down along the bottom plate or the side plate, thus achieving good separation of the oil-gas mixture. (4) Since the axial direction of the first through groove forms a preset angle with the axial direction of the second through groove, a corner is formed at the connection of the two in the entire drainage channel. The change in the angle causes the flow direction of the oil-gas mixture to change accordingly. When the oil-gas mixture passes through the corner position, the oil molecules in the oil-gas mixture will deviate from the main body of the oil-gas mixture due to inertia and collide with the inner wall of the drainage channel and deposit, further realizing the separation of the oil-gas mixture. (5) The side of the first boss away from the bottom plate is set obliquely to prevent the oil molecules flowing down from the bottom plate from accumulating on the surface of the first boss, while the side of the second boss away from the bottom plate is set flat to ensure that the oil-gas mixture flowing out from the second boss can impact the impact chamber directly, further achieving the separation of the oil-gas mixture. (6) By providing convex ribs on the platform, when the oil-gas mixture encounters the convex ribs, it will be forced to change its flow direction, causing the dispersion or deflection of the oil-gas mixture. Since the oil-gas mixture contains oil molecules, the impact on the convex ribs will cause the separation of the oil molecules from the gas molecules. Among them, the heavier oil molecules deposit on the surface of the convex ribs due to inertia, while the lighter gas molecules continue to move forward, thus further realizing the separation of the oil-gas mixture. In addition, due to the presence of the convex ribs, the contact area between the platform and the oil-gas mixture molecules is increased, thereby increasing the friction force and further reducing the flow rate of the oil-gas mixture. (7). Since the convex ribs are arranged with variable diameters, the oil-gas mixture will generate different resistances and flow guiding effects when hitting different positions of the convex ribs. On the one hand, the convex ribs with variable diameters can more easily separate the oil molecules from the oil-gas mixture. On the other hand, the oil-gas mixture will experience more shear stress and friction force, which will further cause energy loss, thereby further reducing the flow rate of the oil-gas mixture, making the time for the oil-gas mixture to flow through the pre-separation system longer and the oil-gas separation better. (8). After the oil-gas mixture collides with the convex ribs, it flows to the lowest end of the climbing chamber and then gradually rises to the highest end of the climbing chamber. During this process, due to the diffusion effect of the flow of the oil-gas mixture, on the one hand, the concentration of the oil-gas mixture is reduced, and on the other hand, the heavier oil molecules in the oil-gas mixture are separated from the lighter gas molecules, thereby further improving the oil-gas separation effect. (9). One end of the climbing chamber connected to the falling chamber is arranged with a reduced opening, so that the oil-gas mixture flows from a larger space area to a smaller space area during the climbing process, which can increase the flow rate of the oil-gas mixture, avoid "crowding" in the area between the climbing chamber and the falling chamber, and improve the reliability of oil-gas separation. In addition, the setting of the reduced opening makes the oil-gas mixture collide with the side wall of the reduced opening during the climbing process, so that the oil molecules and gas molecules are further separated, thereby improving the separation effect of the oil-gas mixture. (10). The gas outlet end is arranged at the bottom of the falling chamber, so that the oil-gas mixture can enter the subsequent fine separation system of the oil-gas mixture from bottom to top, ensuring that the oil-gas mixture can fully fill the entire fine separation system of the oil-gas mixture, thereby improving the separation effect of the oil-gas mixture in the fine separation system of the oil-gas mixture. In addition, the reason for discharging the oil-gas mixture from the gas outlet end in an extrusion manner is that on the one hand, the gravity can be used to assist the flow in the initial stage, especially for the oil-gas mixture with a larger density. Doing so can reduce the energy required for startup and improve the transportation efficiency. In addition, extruding from the bottom helps to maintain the mixed state of all components, reduce the accumulation of oil molecules in the oil-gas mixture at the bottom of the falling chamber, and improve the smoothness of the transportation of the oil-gas mixture. (11). The cross-sectional area of the falling chamber is set to be an equal cross-section, so that the oil-gas mixture can flow at a relatively constant speed, which helps to achieve a more stable transportation process, reduce the unstable factors caused by the change of the flow rate, and enable the oil-gas mixture to enter the subsequent fine separation system of the oil-gas mixture at a relatively gentle speed for oil-gas mixture separation. Brief Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the pre-separation system of an oil-gas separator of the present invention.

[0026] Figure 2 is Figure 1 a schematic structural view from another perspective as shown.

[0027] Figure 3 is Figure 1 a schematic structural view from the third perspective as shown.

[0028] In the figure, 100 is the housing; 110 is the expansion chamber; 111 is the side plate; 112 is the bottom plate; 113 is the first boss; 114 is the second boss; 115 is the first through groove; 116 is the second through groove; 120 is the impact chamber; 121 is the platform; 122 is the rib; 130 is the climbing chamber; 140 is the falling-back chamber; 150 is the air inlet end; 160 is the air outlet end; 170 is the partition; 171 is the first partition plate; 172 is the second partition plate. Specific Embodiments

[0029] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] Embodiment 1 As Figures 1 to 3 shown, a pre-separation system of an oil-gas separator provided by the present invention includes: a housing 100, an expansion chamber 110, an impact chamber 120, a climbing chamber 130, and a falling-back chamber 140 are sequentially arranged along the separation path of the oil-gas mixture. The expansion chamber 110 is connected to the impact chamber 120 through a drainage channel. The impact chamber 120 and the climbing chamber 130 are arranged side by side. The climbing chamber 130 and the falling-back chamber 140 are separated by a partition 170, so that the climbing chamber 130 and the falling-back chamber 140 are spliced to form a U-shaped structure with the opening facing downwards. Among them, the expansion chamber 110 is connected to the air inlet end 150, and the falling-back chamber 140 is connected to the air outlet end 160. The oil-gas mixture enters the impact chamber 120 from the expansion chamber 110 from top to bottom. The oil-gas mixture overflowing from the impact chamber 120 enters the climbing chamber 130, and after passing over the connection position between the climbing chamber 130 and the falling-back chamber 140 from bottom to top, it is discharged from the air outlet end 160 through the falling-back chamber 140 from top to bottom.

[0032] When the flow rate of the oil-gas mixture enters the expansion chamber 110 from the intake end 150, its velocity slows down. When it passes through the diversion channel and impacts the impact chamber 120, its velocity slows down again. Then it overflows from the impact chamber 120, and its velocity slows down again when flowing in the climbing chamber 130. When passing through the connection between the climbing chamber 130 and the falling chamber 140, its velocity increases, and then it flows out from the outlet end 160 at a stable flow rate through the falling chamber 140.

[0033] In the pre-separation system of the oil-gas separator in this embodiment, the oil mist generated after the engine works and the blow-by gas generated after the combustion chamber works are mixed into the crankcase exhaust gas. The exhaust gas enters the pre-separation system through the intake end 150. Through the pre-separation system, the oil liquid molecules and gas molecules in the exhaust gas are effectively separated, so that the separated engine oil flows back into the engine for reuse again. Other gases enter the subsequent fine-separation oil-gas separation system through the outlet end 160 and finally enter the combustion chamber to participate in combustion again.

[0034] A pre-separation system of an oil-gas separator provided by the present invention meets the requirements of vehicles in terms of environmental protection, emissions, and safety through reasonable layout. Moreover, the structure of the pre-separation system is designed compactly, and the oil-gas separation efficiency is higher. Furthermore, the recovery rate of engine oil and the degree of reuse of exhaust gas are higher, which is more conducive to environmental protection and resource conservation.

[0035] It is worth mentioning that after the oil-gas mixture enters the expansion chamber 110 from the intake end 150, through the expansion chamber 110, on the one hand, the oil-gas mixture impacts the chamber wall of the expansion chamber 110, so that the oil droplets in the oil-gas mixture flow down along the chamber wall. On the other hand, it can slow down the flow rate of the oil-gas mixture and extend the time of the oil-gas mixture in the expansion chamber 110, ensuring that the oil-gas mixture can contact the chamber wall in the expansion chamber 110 as much as possible to achieve the separation of the oil-gas mixture.

[0036] It is further pointed out that the expansion chamber 110 includes a side part formed by splicing multiple side plates 111 end to end to form a closed structure, and a bottom plate 112 used to seal one end of the side part. The other end of the side part is the intake end 150, and the bottom plate 112 is obliquely arranged, wherein the bottom plate 112 is inclined along the direction close to the intake end 150.

[0037] In this embodiment, since the bottom plate 112 is obliquely arranged, when the oil-gas mixture collides with the bottom plate 112, it will deflect or scatter in direction. Moreover, the oil-gas mixture contains oil liquid molecules. The impact causes the oil liquid molecules and gas molecules in the oil-gas mixture to be separated, so that the oil liquid molecules can adhere to the side plate 111 or the bottom plate 112 after the impact, and then flow down along the bottom plate 112 or the side plate 111, thus realizing good separation of the oil-gas mixture.

[0038] Preferably, on the upper and lower sides of one side plate 111 along the direction of the oil-gas mixture separation path, there are provided bosses, namely a first boss 113 and a second boss 114 respectively. And a first through groove 115 is provided on the first boss 113, and a second through groove 116 is provided on the second boss 114. The first through groove 115 communicates with the second through groove 116 to form a drainage channel. Among them, the axial direction of the first through groove 115 and the axial direction of the second through groove 116 form a preset angle.

[0039] In this embodiment, since the axial direction of the first through groove 115 and the axial direction of the second through groove 116 form a preset angle, the entire drainage channel forms a corner at the connection of the two. And the change in the angle causes the flow direction of the oil-gas mixture to change accordingly. When the oil-gas mixture passes through the corner position, the oil molecules in the oil-gas mixture will deviate from the main body of the oil-gas mixture due to inertia, hit the inner wall of the drainage channel and deposit, further realizing the separation of the oil-gas mixture.

[0040] It is further pointed out that the side of the first boss 113 away from the bottom plate 112 is obliquely arranged, and the side of the second boss 114 away from the bottom plate 112 is flat.

[0041] It is worth mentioning that setting the side of the first boss 113 away from the bottom plate 112 to be obliquely arranged is to prevent the oil molecules flowing down from the bottom plate 112 from accumulating on the surface of the first boss 113, and setting the side of the second boss 114 away from the bottom plate 112 to be flat is to ensure that the oil-gas mixture flowing out from the second boss 114 can impact the impact chamber 120 directly, further realizing the separation of the oil-gas mixture.

[0042] It is further pointed out that both the first through groove 115 and the second through groove 116 are in the shape of waist-shaped holes, and the ratio of the area of the waist-shaped holes to the area of the bottom plate 112 is between 1:1.5 and 1:2.

[0043] Preferably, a platform 121 is provided in the impact chamber 120, and a plurality of convex ribs 122 are provided on the platform 121. Among them, the distance between any two adjacent convex ribs 122 is equal.

[0044] In this embodiment, by providing the convex ribs 122 on the platform 121, when the oil-gas mixture encounters the convex ribs 122, it will be forced to change its flow direction, causing the dispersion or deflection of the oil-gas mixture. Since the oil-gas mixture contains oil molecules, after hitting the convex ribs 122, the oil molecules will be separated from the gas molecules. Among them, the heavier oil molecules deposit on the surface of the convex ribs 122 due to inertia, while the lighter gas molecules continue to move forward, thereby further realizing the separation of the oil-gas mixture. In addition, due to the presence of the convex ribs 122, the contact area between the platform 121 and the oil-gas mixture molecules is increased, thereby increasing the frictional force and further reducing the flow rate of the oil-gas mixture.

[0045] It is further pointed out that the convex ribs 122 are arranged with a variable diameter, and the width of the convex ribs 122 near the bottom plate 112 is larger, and the width of the convex ribs 122 near the intake end 150 is smaller. Among them, the variable diameter of the convex ribs 122 is arranged in a gradual change.

[0046] In this embodiment, since the convex ribs 122 are arranged with a variable diameter, different resistances and flow guiding effects will be generated when the oil-gas mixture hits different positions of the convex ribs 122. On the one hand, the variable-diameter convex ribs 122 can more easily separate the oil molecules from the oil-gas mixture. On the other hand, the oil-gas mixture will experience more shear stress and frictional force, thereby further causing energy loss, so as to further reduce the flow rate of the oil-gas mixture, making the time for the oil-gas mixture to flow through the pre-separation system longer, and the oil-gas separation will be better.

[0047] It is further pointed out that the gap between two adjacent convex ribs 122 is between 2-3 mm.

[0048] Preferably, there is a height difference between the lowest end of the climbing chamber 130 and the surface of the platform 121 where the convex ribs 122 are located.

[0049] In this embodiment, when the oil-gas mixture hits the convex ribs 122, it flows to the lowest end of the climbing chamber 130 and then gradually rises to the highest end of the climbing chamber 130. During this process, due to the diffusion effect of the flow of the oil-gas mixture, on the one hand, the concentration of the oil-gas mixture is reduced, and on the other hand, the heavier oil molecules in the oil-gas mixture are separated from the lighter gas molecules, thereby further improving the oil-gas separation effect.

[0050] Preferably, the end of the climbing chamber 130 connected to the falling chamber 140 is arranged in a constricted shape.

[0051] In this embodiment, one end of the climbing chamber 130 communicating with the falling chamber 140 is provided with a reduced opening, so that the oil-gas mixture flows from a region with a larger space to a region with a smaller space during the climbing process, thereby increasing the flow rate of the oil-gas mixture and avoiding "crowding" in the region between the climbing chamber 130 and the falling chamber 140, improving the reliability of oil-gas separation. In addition, the reduced opening is provided so that the oil-gas mixture will collide with the side wall of the reduced opening during the climbing process, enabling further separation of oil liquid molecules and gas molecules, thereby improving the separation effect of the oil-gas mixture.

[0052] Further preferably, the two side walls of the climbing chamber 130 are respectively the partition plate 170 and the side plate 111 of the expansion chamber 110, and the partition plate 170 includes a first end and a second end, and the reduced opening is formed by the first end tilting in the direction close to the side plate 111.

[0053] Preferably, the partition plate 170 includes a first partition plate 171 and a second partition plate 172 which are integrally arranged, and the first partition plate 171 tilts in the direction close to the side plate 111, and the second partition plate 172 tilts in the direction away from the side plate 111, so that a region with a smaller space is formed between the first partition plate 171 and the side plate 111, and a region with a larger space is formed between the second partition plate 172 and the side plate 111. Among them, the oil-gas mixture overflowing from the impact chamber 120 first enters the region with a larger space and then climbs into the region with a smaller space.

[0054] Preferably, the air outlet end 160 is arranged at the bottom of the falling chamber 140, and the oil-gas mixture entering the falling chamber 140 is discharged from the air outlet end 160 from top to bottom in an extrusion manner.

[0055] In this embodiment, the air outlet end 160 is arranged at the bottom of the falling chamber 140, so that the oil-gas mixture can enter the subsequent fine separation system of the oil-gas mixture from bottom to top, ensuring that the oil-gas mixture can fully fill the entire fine separation system of the oil-gas mixture, thereby improving the separation effect of the oil-gas mixture in the fine separation system of the oil-gas mixture. In addition, the reason for discharging the oil-gas mixture from the air outlet end 160 in an extrusion manner is that, on the one hand, the gravity can be utilized to assist the flow in the initial stage, especially for the oil-gas mixture with a larger density. Doing so can reduce the energy required during startup and improve the conveying efficiency. In addition, extruding from the bottom helps to maintain the mixed state of all components, reduce the accumulation of oil liquid molecules in the oil-gas mixture at the bottom of the falling chamber 140, and improve the smoothness of the oil-gas mixture conveying.

[0056] It is further pointed out that the cross-sectional area of the falling chamber 140 is set to be of equal cross-section.

[0057] In this embodiment, the cross-sectional area of the falling chamber 140 is set to be of equal cross-section, so that the oil-gas mixture can flow at a relatively constant speed. This helps to achieve a more stable transportation process, reduce the unstable factors caused by the change in flow rate, and enable the oil-gas mixture to enter the subsequent oil-gas mixture fine separation system at a relatively gentle speed for the separation of the oil-gas mixture.

[0058] Embodiment Two Based on the above Embodiment One, a filter mesh plate can be added. The filter mesh plate can be arranged at one or more positions of the air inlet end 150, the first through groove 115, the second through groove 116, the connection between the climbing chamber 130 and the falling chamber 140, or the air outlet end 160. In this way, when the oil-gas mixture passes through the filter mesh plate, the oil molecule in the oil-gas mixture can be further stripped from the oil-gas mixture. Moreover, the connection of the filter mesh plate to each position is generally a detachable connection, so the effect of oil-gas separation can be ensured by replacing the filter mesh plate.

[0059] It is worth mentioning that the number of filter mesh plates and the number of mesh holes on the filter mesh plate can be increased or replaced according to the actual situation, that is, multiple stacked filter mesh plates can be added at the same position.

[0060] Embodiment Three Compared with Embodiment One, the difference in this embodiment is that among the multiple ribs 122 in Embodiment One, the wider ends of the ribs 122 are arranged on the same side, and the narrower ends of the ribs 122 are arranged on the same side. In this embodiment, the wider ends and the narrower ends of two adjacent ribs 122 can be arranged in a staggered manner.

[0061] It should be noted that in the present invention, descriptions such as "first", "second", and "one" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. Terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0062] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A pre-separation system for an oil-gas separator, characterized in that: include: The shell is provided with an expansion chamber, an impact chamber, a climbing chamber and a falling chamber in sequence along the separation path of the oil-gas mixture, and the expansion chamber is connected with the impact chamber through a drainage channel, the impact chamber and the climbing chamber are arranged side by side, and the climbing chamber and the falling chamber are separated by a partition, so that the climbing chamber and the falling chamber are spliced ​​to form a U-shaped structure with the opening facing downward; The expansion chamber is connected with the air inlet end, and the fallback chamber is connected with the air outlet end. The oil-gas mixture enters the impact chamber from the expansion chamber from top to bottom, and the oil-gas mixture overflowing from the impact chamber enters the climbing chamber, and passes through the connecting position of the climbing chamber and the fallback chamber from bottom to top, and is discharged from the air outlet end from top to bottom through the fallback chamber. The flow velocity of the oil-gas mixture in the expansion chamber is greater than that in the impact chamber; the flow velocity of the oil-gas mixture in the impact chamber is greater than that in the climbing chamber; the flow velocity of the oil-gas mixture in the climbing chamber is greater than that in the falling chamber.

2. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: The expansion chamber includes a side portion formed by splicing multiple side panels end to end to form a closed structure, and a bottom plate used to seal one end of the side portion, the other end of the side portion is an air inlet end, and the bottom plate is arranged obliquely, wherein the bottom plate is inclined in a direction close to the air inlet end.

3. The pre-separation system of the oil-gas separator according to claim 2, characterized in that: One side plate is provided with bosses on the upper and lower sides along the oil-gas mixture separation path, which are respectively a first boss and a second boss, and a first through groove is provided on the first boss, and a second through groove is provided on the second boss, the first through groove is connected with the second through groove to form a drainage channel, wherein the axial direction of the first through groove forms a preset angle with the axial direction of the second through groove.

4. The pre-separation system of the oil-gas separator according to claim 3, characterized in that: The side of the first boss away from the bottom plate is arranged obliquely, and the side of the second boss away from the bottom plate is arranged flatly.

5. The pre-separation system of the oil-gas separator according to claim 3, characterized in that: The first through groove and the second through groove are both arranged as waist-shaped holes, and the ratio of the area of ​​the waist-shaped hole to the area of ​​the bottom plate is between 1:1.5-1:

2.

6. The pre-separation system of the oil-gas separator according to claim 2, characterized in that: A platform is arranged in the impact chamber, and a plurality of convex ribs are arranged on the platform, wherein the distance between any two adjacent convex ribs is equal.

7. The pre-separation system of the oil-gas separator according to claim 6, characterized in that: The convex rib is arranged in a variable diameter, and the width of the convex rib on the side close to the bottom plate is greater than the width of the convex rib on the side close to the air inlet end, wherein the variable diameter of the convex rib is arranged in a gradual manner.

8. The pre-separation system of the oil-gas separator according to claim 6, characterized in that: The gap between two adjacent ribs is between 2-3 mm.

9. The pre-separation system of the oil-gas separator according to claim 6, characterized in that: There is a height difference between the lowest end of the climbing chamber and the surface where the ribs on the platform are located.

10. The pre-separation system of the oil-gas separator according to claim 2, characterized in that: One end of the climbing chamber communicating with the falling chamber is configured with a contracted opening.

11. The pre-separation system of the oil-gas separator according to claim 10, characterized in that: The side walls of the climbing chamber are respectively a partition and a side plate of the expansion chamber, and the partition includes a first end and a second end, and a constriction is formed by tilting the first end in a direction close to the side plate.

12. The pre-separation system of the oil-gas separator according to claim 10, characterized in that: The partition includes a first partition plate and a second partition plate which are integrally arranged, and the first partition plate is inclined in a direction close to the side plate, and the second partition plate is inclined in a direction away from the side plate, so that the space area formed between the first partition plate and the side plate is smaller than the space area formed between the second partition plate and the side plate, wherein the oil-gas mixture overflowing from the impact chamber first enters the space area between the second partition plate and the side plate, and then climbs into the space area between the first partition plate and the side plate.

13. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: The gas outlet is arranged at the bottom of the falling back chamber, and the oil-gas mixture entering the falling back chamber is discharged from the gas outlet from top to bottom in an extrusion manner.

14. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: The cross-sectional area of ​​the fall-back chamber is arranged in a uniform cross-sectional area.

15. The pre-separation system of the oil-gas separator according to claim 3, characterized in that: A filter screen is provided at the air inlet end, the first through slot, the second through slot, the connecting point between the climbing chamber and the falling chamber, or one or more positions in the air outlet end.

16. An oil-gas separator, characterized in that: A pre-separation system comprising any one of claims 1 to 15.

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