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

Abstract

The present invention provides a pre-separation system for an oil-gas separator and an oil-gas separator, belonging to the technical field of automotive parts. The system comprises a housing, an expansion chamber, an impact chamber, a climbing chamber, and a falling chamber arranged in sequence along the separation path of the oil-gas mixture, wherein the expansion chamber and the impact chamber are connected by 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 present invention achieves the environmental protection, emission, and safety requirements of the vehicle through reasonable layout, and the pre-separation system has a compact structural design, a higher oil-gas separation efficiency, and thus a higher oil recovery rate and a higher degree of waste gas reuse, which is more conducive to environmental protection and resource conservation.

Description

Technical Field

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

[0002] The internal structure of the oil-gas separator of the engine crankcase ventilation system is divided into two separation structures: pre-separation and fine separation. The current development trend of the engine is miniaturization and lightweight design, which limits the space of the pre-separation structure. However, the traditional design concept of maze or long channel for oil droplets to adhere cannot be widely used due to technical shortcomings such as limited space of the pre-separation structure, many required parts, complex structural layout, and high cost.

[0003] Patent application CN202020590323.1 discloses an oil-gas separator pre-separation structure and a vehicle having the same. The oil-gas separator pre-separation structure includes: an upper shell, a lower shell and an isolation plate. The isolation plate is arranged between the upper shell and the lower shell; a gap for oil and gas to pass through is left between the left end of the isolation plate and the inner cavity of the upper shell. A first vertical plate is provided in the middle of the isolation plate. The upper end of the first vertical plate is installed in the mounting groove of the inner top wall of the upper shell. A small hole is opened on the first vertical plate. The first vertical plate divides the inner cavity of the upper shell into an upper half pre-separation chamber on the left and an upper half fine separation chamber on the right. An upwardly protruding curved portion is provided in the middle of the isolation plate located on the lower side of the upper half pre-separation chamber.

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

[0005] Patent application CN202121903368.0 discloses an oil-gas separation device, which includes: a shell, an oil guide channel and an oil-gas separation assembly, the upper part of the shell is respectively provided with an air inlet and an air outlet, and the lower part of the shell is provided with an oil outlet; the oil guide channel is U-shaped and is arranged at the lower part of the shell, one end of the oil guide channel is provided with an inlet, and the other end of the oil guide channel is provided with an outlet, and the outlet is connected to the oil outlet, wherein the height of the inlet is higher than the height of the outlet; the oil-gas separation assembly is arranged at the upper part of the shell, and the oil-gas separation assembly corresponds to the air inlet, air outlet and inlet, respectively.

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

[0007] The purpose of the present invention is to address the above problems in the existing technology and to 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 through the following technical solutions: A pre-separation system for an oil-gas separator, comprising:

[0009] The shell is provided with an expansion chamber, an impact chamber, a climbing chamber, and a return chamber in sequence along the separation path of the oil-gas mixture, and the expansion chamber and the impact chamber are connected by a drainage channel. The impact chamber and the climbing chamber are arranged side by side, and the climbing chamber and the return chamber are separated by a partition, so that the climbing chamber and the return chamber are spliced ​​to form a U-shaped structure with the opening facing downward;

[0010] The expansion chamber is connected to the air inlet end, and the fallback chamber is connected to 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 connection position between 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.

[0011] 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 return chamber.

[0012] In the pre-separation system of the above-mentioned oil-gas separator, 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 for sealing one end of the side portion, the other end of the side portion is the air inlet end, and the bottom plate is arranged obliquely, wherein the bottom plate is inclined in the direction close to the air inlet end.

[0013] In the above-mentioned pre-separation system of the oil-gas separator, one side plate is provided with bosses on the upper and lower sides along the oil-gas mixture separation path, namely the first boss and the 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 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.

[0014] In the above-mentioned pre-separation system of the oil-gas separator, 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.

[0015] In the above-mentioned pre-separation system of the oil-gas separator, 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 and 1:2.

[0016] In the above-mentioned pre-separation system of the oil-gas separator, a platform is provided in the impact chamber, and a plurality of ribs are provided on the platform, wherein the distance between any two adjacent ribs is equal.

[0017] In the above-mentioned pre-separation system of the oil-gas separator, the convex rib is arranged with a variable diameter, and the width of the convex rib close to the bottom plate is greater than the width of the convex rib close to the air inlet end, wherein the diameter of the convex rib is gradually changed.

[0018] In the above-mentioned pre-separation system of the oil-gas separator, the gap between two adjacent ribs is between 2-3 mm.

[0019] In the above-mentioned pre-separation system of the oil-gas separator, there is a height difference between the lowest end of the climbing chamber and the surface on which the ribs on the platform are located.

[0020] In the above-mentioned pre-separation system of the oil-gas separator, one end of the climbing chamber communicating with the falling chamber is configured to be constricted.

[0021] In the above-mentioned pre-separation system of the oil-gas separator, the side walls of the climbing chamber are respectively the partition and the side plate of the expansion chamber, and the partition includes a first end and a second end, and the first end is tilted in the direction close to the side plate to form a constriction.

[0022] In the pre-separation system of the above-mentioned oil-gas separator, the partition includes a first partition plate and a second partition plate that 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.

[0023] In the above-mentioned pre-separation system of the oil-gas separator, the gas outlet is arranged at the bottom of the fall-back chamber, and the oil-gas mixture entering the fall-back chamber is discharged from the gas outlet from top to bottom in an extrusion manner.

[0024] In the above-mentioned pre-separation system of the oil-gas separator, the cross-sectional area of ​​the fallback chamber is arranged to be a uniform cross-section.

[0025] In the pre-separation system of the above-mentioned oil-gas separator, a filter plate is set at the air inlet end, the first through groove, the second through groove, the connection point between the climbing chamber and the falling chamber, or one or more positions in the air outlet end.

[0026] The present invention also provides an oil-gas separator comprising the pre-separation system.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention provides a pre-separation system for an oil-gas separator, which achieves the environmental protection, emission and safety requirements of the vehicle through reasonable arrangement. The pre-separation system has a compact structure and a higher oil-gas separation efficiency, thereby increasing the oil recovery rate and the degree of waste gas reuse, which is more conducive to environmental protection and resource conservation.

[0029] (2) Through the expansion chamber, on the one hand, the oil-gas mixture collides with the cavity wall of the expansion chamber, causing the oil droplets in the oil-gas mixture to flow down along the cavity wall; on the other hand, it can slow down the flow speed of the oil-gas mixture, prolong the time the oil-gas mixture stays in the expansion chamber, and ensure that the oil-gas mixture can contact the cavity wall of the expansion chamber as much as possible to achieve separation of the oil-gas mixture;

[0030] (3) Since the bottom plate is tilted, the oil-gas mixture will be deflected or scattered in a certain direction when it collides with the bottom plate. In addition, the oil-gas mixture contains oil molecules. The impact causes the oil molecules in the oil-gas mixture to separate from the gas molecules. The oil molecules can adhere to the side plate or the bottom plate after the collision and then flow down along the bottom plate or the side plate, thereby achieving good separation of the oil-gas mixture.

[0031] (4) Since the axis direction of the first through groove forms a preset angle with the axis direction of the second through groove, the entire drainage channel forms a corner at the connection between the two. The change in angle causes the flow direction of the oil-gas mixture to change. 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 settle, further realizing the separation of the oil-gas mixture;

[0032] (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 of the second boss can positively impact the impact chamber, thereby further separating the oil-gas mixture;

[0033] (6) By setting ribs on the platform, the oil-gas mixture is forced to change its flow direction when encountering the ribs, causing the oil-gas mixture to disperse or deflect. Since the oil-gas mixture contains oil molecules, the oil molecules and gas molecules will separate after hitting the ribs. The heavier oil molecules will settle down due to inertia after hitting the rib surface, while the lighter gas molecules will continue to move forward, thereby further achieving the separation of the oil-gas mixture. In addition, the presence of the ribs increases the contact area between the platform and the oil-gas mixture molecules, thereby increasing friction and reducing the flow rate of the oil-gas mixture.

[0034] (7) Since the ribs are of variable diameter, the oil-gas mixture will produce different resistance and diversion effects at different locations when it hits the ribs. On the one hand, the variable diameter ribs 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, which will further lead to energy loss, thereby further reducing the flow rate of the oil-gas mixture, making the oil-gas mixture flow through the pre-separation system for a longer time, and the oil-gas separation will be better;

[0035] (8) When the oil-gas mixture collides with the rib, 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, the oil-gas mixture diffuses due to its flow, which reduces the concentration of the oil-gas mixture on the one hand and separates the heavier oil molecules from the lighter gas molecules in the oil-gas mixture on the other hand, thereby further improving the oil-gas separation effect.

[0036] (9) The end of the climbing chamber that is connected to the falling chamber is configured with a constricted opening, so that the oil-gas mixture flows from a larger area to a smaller area during the climbing process, thereby increasing the flow rate of the oil-gas mixture and avoiding "crowding" of the oil-gas mixture in the area between the climbing chamber and the falling chamber, thereby improving the reliability of oil-gas separation. In addition, the setting of the constricted opening allows the oil-gas mixture to collide with the side wall of the constricted opening during the climbing process, allowing the oil molecules and gas molecules to be further separated, thereby improving the separation effect of the oil-gas mixture;

[0037] (10) The gas outlet is set at the bottom of the fallback chamber so that the oil-gas mixture can enter the subsequent oil-gas mixture fine separation system from bottom to top, ensuring that the oil-gas mixture can fully fill the entire oil-gas mixture fine separation system, thereby improving the separation effect of the oil-gas mixture in the oil-gas mixture fine separation system. In addition, the reason why the oil-gas mixture is discharged from the gas outlet in an extruded manner is that, on the one hand, gravity can be used to assist the flow in the initial stage, especially for oil-gas mixtures with higher density. This can reduce the energy required for starting and improve the transportation efficiency. In addition, extrusion 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 fallback chamber, and improve the smoothness of the oil-gas mixture transportation.

[0038] (11) The cross-sectional area of ​​the fallback chamber is set to a constant 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 instability factors caused by changes in flow rate, and enable the oil-gas mixture to enter the subsequent oil-gas mixture fine separation system at a relatively slow speed for separation of the oil-gas mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a pre-separation system of an oil-gas separator of the present invention.

[0040] Figure 2 yes Figure 1 A structural diagram from another perspective is shown.

[0041] Figure 3 yes Figure 1 The structural diagram of the third perspective is shown.

[0042] In the figure, 100, shell; 110, expansion chamber; 111, side plate; 112, bottom plate; 113, first boss; 114, second boss; 115, first through groove; 116, second through groove; 120, impact chamber; 121, platform; 122, rib; 130, climbing chamber; 140, falling chamber; 150, air inlet end; 160, air outlet end; 170, partition; 171, first partition plate; 172, second partition plate. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] Example 1

[0046] like Figures 1 to 3 As shown, the present invention provides a pre-separation system of an oil-gas separator, comprising: a housing 100, wherein an expansion chamber 110, an impact chamber 120, a climbing chamber 130 and a falling chamber 140 are sequentially arranged along the separation path of the oil-gas mixture, and the expansion chamber 110 and the impact chamber 120 are connected through a drainage channel, the impact chamber 120 and the climbing chamber 130 are arranged side by side, and the climbing chamber 130 and the falling chamber 140 are separated by a partition 170, so that the climbing chamber 130 and the falling chamber 140 are separated. The fall-back chamber 140 is spliced ​​to form a U-shaped structure with an opening facing downward, wherein the expansion chamber 110 is connected to the air inlet end 150, and the fall-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, and the oil-gas mixture overflowing from the impact chamber 120 enters the climbing chamber 130, and after passing the connecting position between the climbing chamber 130 and the fall-back chamber 140 from bottom to top, it is discharged from the air outlet end 160 through the fall-back chamber 140 from top to bottom.

[0047] The flow rate of the oil-gas mixture slows down when it enters the expansion chamber 110 from the air inlet end 150, slows down again when it hits the impact chamber 120 through the drainage channel, and then overflows from the impact chamber 120, slows down again when flowing in the climbing chamber 130, increases when passing through the connection between the climbing chamber 130 and the falling chamber 140, and then flows out from the air outlet end 160 through the falling chamber 140 at a stable flow rate.

[0048] In the pre-separation system of the oil-gas separator in this embodiment, the oil mist generated after the engine is working and the blowby gas generated after the combustion chamber is working are mixed into crankcase exhaust gas. The exhaust gas enters the pre-separation system through the air inlet end 150. The oil molecules and gas molecules in the exhaust gas are effectively separated by the pre-separation system, so that the separated engine oil flows back to the engine for reuse. Other gases enter the subsequent fine separation oil-gas separation system through the air outlet end 160, and finally enter the combustion chamber to participate in combustion again.

[0049] The present invention provides a pre-separation system for an oil-gas separator, which achieves the vehicle's environmental protection, emission and safety requirements through reasonable layout. The pre-separation system has a compact structural design and a higher oil-gas separation efficiency, thereby increasing the oil recovery rate and the degree of waste gas reuse, which is more conducive to environmental protection and resource conservation.

[0050] It is worth mentioning that when the oil-gas mixture enters the expansion chamber 110 from the air inlet end 150, the oil-gas mixture collides with the cavity wall of the expansion chamber 110 through the expansion chamber 110, so that the oil droplets in the oil-gas mixture flow down along the cavity wall; on the other hand, it can slow down the circulation speed of the oil-gas mixture, prolong the time of the oil-gas mixture in the expansion chamber 110, and ensure that the oil-gas mixture can contact the cavity wall of the expansion chamber 110 as much as possible to achieve separation of the oil-gas mixture.

[0051] It is further pointed out that the expansion chamber 110 includes a side portion formed by splicing multiple side panels 111 end to end to form a closed structure, and a bottom plate 112 for sealing one end of the side portion, the other end of the side portion is the air inlet end 150, and the bottom plate 112 is arranged obliquely, wherein the bottom plate 112 is inclined in the direction close to the air inlet end 150.

[0052] In this embodiment, since the bottom plate 112 is arranged at an angle, the oil-gas mixture will produce directional deflection or scattering when it collides with the bottom plate 112. In addition, the oil-gas mixture contains oil molecules, and the impact causes the oil molecules and gas molecules in the oil-gas mixture to separate, so that the oil molecules can adhere to the side plate 111 or the bottom plate 112 after the collision, and then flow down along the bottom plate 112 or the side plate 111, thereby achieving good separation of the oil-gas mixture.

[0053] Preferably, one side plate 111 is provided with bosses on the upper and lower sides along the oil-gas mixture separation path, namely a first boss 113 and a second boss 114, 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 is connected to the second through groove 116 to form a drainage channel, wherein the axial direction of the first through groove 115 and the axial direction of the second through groove 116 form a preset angle.

[0054] 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 between the two. The change in angle causes the flow direction of the oil-gas mixture to change. 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 settle, thereby further realizing the separation of the oil-gas mixture.

[0055] It is further pointed out that the side of the first boss 113 away from the bottom plate 112 is arranged in an oblique direction, and the side of the second boss 114 away from the bottom plate 112 is arranged in a flat direction.

[0056] It is worth mentioning that the side of the first boss 113 away from the bottom plate 112 is set obliquely to avoid the oil molecules flowing down from the bottom plate 112 from accumulating on the surface of the first boss 113, and the side of the second boss 114 away from the bottom plate 112 is set flat to ensure that the oil-gas mixture flowing out of the second boss 114 can positively impact the impact chamber 120, thereby further separating the oil-gas mixture.

[0057] It is further pointed out that the first through groove 115 and the second through groove 116 are both arranged in the form 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.

[0058] Preferably, a platform 121 is provided in the impact chamber 120 , and a plurality of ribs 122 are provided on the platform 121 , wherein the distance between any two adjacent ribs 122 is equal.

[0059] In this embodiment, by providing ribs 122 on platform 121, the oil-gas mixture is forced to change its flow direction upon encountering ribs 122, causing the mixture to disperse or deflect. Since the oil-gas mixture contains oil molecules, impacting ribs 122 causes the oil molecules to separate from the gas molecules. The heavier oil molecules, due to inertia, settle on the surface of ribs 122, while the lighter gas molecules continue forward, further separating the oil-gas mixture. Furthermore, the presence of ribs 122 increases the contact area between platform 121 and the oil-gas mixture molecules, thereby increasing friction and reducing the flow rate of the oil-gas mixture.

[0060] It is further pointed out that the rib 122 is arranged to have a variable diameter, and the width of the rib 122 on the side close to the bottom plate 112 is larger, and the width of the rib 122 on the side close to the air inlet end 150 is smaller, wherein the diameter change of the rib 122 is arranged in a gradual manner.

[0061] In this embodiment, since the rib 122 is set with a variable diameter, the oil-gas mixture will produce different resistance and diversion effects when it hits the rib 122 at different positions. On the one hand, the variable diameter rib 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 friction, which will further lead to energy loss, thereby further reducing the flow rate of the oil-gas mixture, making the oil-gas mixture flow through the pre-separation system for a longer time, and the oil-gas separation will be better.

[0062] It is further pointed out that the gap between two adjacent ribs 122 is between 2-3 mm.

[0063] Preferably, there is a height difference between the lowest end of the climbing chamber 130 and the surface of the platform 121 where the ribs 122 are located.

[0064] In this embodiment, when the oil-gas mixture collides with the rib 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, the flow of the oil-gas mixture causes diffusion, which on the one hand reduces the concentration of the oil-gas mixture, and on the other hand causes the heavier oil molecules in the oil-gas mixture to separate from the lighter gas molecules, thereby further improving the oil-gas separation effect.

[0065] Preferably, the end of the climbing chamber 130 communicating with the falling chamber 140 is configured to be constricted.

[0066] In this embodiment, the end of the climbing chamber 130 that is connected to the falling chamber 140 is configured to be tapered, so that the oil-gas mixture flows from a larger area to a smaller area during the climbing process, thereby increasing the flow rate of the oil-gas mixture and avoiding "crowding" of the oil-gas mixture in the area between the climbing chamber 130 and the falling chamber 140, thereby improving the reliability of oil-gas separation. In addition, the setting of the tapered opening causes the oil-gas mixture to collide with the side wall of the tapered opening during the climbing process, allowing the oil molecules and gas molecules to be further separated, thereby improving the separation effect of the oil-gas mixture.

[0067] Further preferably, the side walls of the climbing chamber 130 are respectively a partition 170 and a side plate 111 of the expansion chamber 110, and the partition 170 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 111.

[0068] Preferably, the partition 170 includes a first partition plate 171 and a second partition plate 172 that are integrally arranged, and the first partition plate 171 is inclined in a direction close to the side plate 111, and the second partition plate 172 is inclined in a direction away from the side plate 111, so that a smaller space area is formed between the first partition plate 171 and the side plate 111, and a larger space area is formed between the second partition plate 172 and the side plate 111, wherein the oil and gas mixture overflowing from the impact chamber 120 first enters the larger space area, and then climbs into the smaller space area.

[0069] Preferably, the gas outlet 160 is provided at the bottom of the falling back chamber 140 , and the oil-gas mixture entering the falling back chamber 140 is discharged from the gas outlet 160 from top to bottom in an extrusion manner.

[0070] In this embodiment, the air outlet end 160 is arranged at the bottom of the fallback chamber 140, so that the oil-gas mixture can enter the subsequent oil-gas mixture fine separation system from bottom to top, ensuring that the oil-gas mixture can fully fill the entire oil-gas mixture fine separation system, thereby improving the separation effect of the oil-gas mixture in the oil-gas mixture fine separation system. In addition, the reason why the oil-gas mixture is discharged from the air outlet end 160 in an extruded manner is that, on the one hand, gravity can be used to assist the flow in the initial stage, especially for oil-gas mixtures with higher density. This can reduce the energy required for startup and improve the transportation efficiency. In addition, extrusion from the bottom helps to maintain the mixing state of all components, reduce the accumulation of oil molecules in the oil-gas mixture at the bottom of the fallback chamber 140, and improve the smoothness of the oil-gas mixture transportation.

[0071] It is further pointed out that the cross-sectional area of ​​the fall-back chamber 140 is arranged to be uniform.

[0072] In this embodiment, the cross-sectional area of ​​the fallback chamber 140 is set to a constant 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 instability factors caused by changes 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 separation of the oil-gas mixture.

[0073] Example 2

[0074] On the basis of the above-mentioned embodiment 1, a filter screen can be additionally provided, and the filter screen can be provided at the air inlet end 150, the first through groove 115, the second through groove 116, the connection point between the climbing chamber 130 and the falling chamber 140, or one or more positions at the air outlet end 160. In this way, when the oil-gas mixture passes through the filter screen, the oil molecules in the oil-gas mixture can be further separated from the oil-gas mixture. Moreover, the connection between the filter screen and each position generally adopts a detachable connection, so the oil-gas separation effect can be ensured by replacing the filter screen.

[0075] It is worth mentioning that the number of filter screen plates and the number of mesh holes on the filter screen plates can be increased or replaced according to actual conditions, that is, multiple filter screen plates arranged in a stacked manner can be added at the same position.

[0076] Example 3

[0077] Compared with the first embodiment, the present embodiment differs in that, among the multiple ribs 122 in the first embodiment, the ends with larger widths on the ribs 122 are arranged on the same side, and the ends with smaller widths on the ribs 122 are arranged on the same side, while in the present embodiment, the ends with larger widths and the ends with smaller widths on two adjacent ribs 122 may be staggered.

[0078] It should be noted that, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0079] 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 the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0080] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of 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 return chamber in sequence along the separation path of the oil-gas mixture, and the expansion chamber and the impact chamber are connected by a drainage channel. The impact chamber and the climbing chamber are arranged side by side, and the climbing chamber and the return chamber are separated by a partition, so that the climbing chamber and the return chamber are spliced ​​to form a U-shaped structure with the opening facing downward; The expansion chamber is connected to the air inlet end, and the fallback chamber is connected to 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 connection position between 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 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 return chamber; 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 for sealing one end of the side portion, and the other end of the side portion is the air inlet end, one of the side panels is provided with a boss on the upper and lower sides along the oil-gas mixture separation path direction, 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 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.

2. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: The bottom plate is arranged in an oblique direction, 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 1, 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.

4. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: The first through groove and the second through groove are both arranged in the form of 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.

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

6. The pre-separation system of the oil-gas separator according to claim 5, 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.

7. The pre-separation system of the oil-gas separator according to claim 5, characterized in that: The gap between two adjacent ribs is between 2-3 mm.

8. The pre-separation system of the oil-gas separator according to claim 5, 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.

9. The pre-separation system of the oil-gas separator according to claim 2, characterized in that: One end of the climbing chamber that is connected with the falling chamber is configured to be constricted.

10. The pre-separation system of the oil-gas separator according to claim 9, characterized in that: The side walls on both sides 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.

11. The pre-separation system of the oil-gas separator according to claim 9, characterized in that: The partition includes a first partition plate and a second partition plate that 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 and 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.

12. 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 chamber, and the oil-gas mixture entering the falling chamber is discharged from the gas outlet from top to bottom in an extrusion manner.

13. 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.

14. The pre-separation system of the oil-gas separator according to claim 1, characterized in that: Filter plates are provided at the air inlet end, the first through slot, the second through slot, the connection point between the climbing chamber and the falling chamber, or one or more positions in the air outlet end.

15. An oil-gas separator, characterized in that: A pre-separation system comprising the pre-separation system according to any one of claims 1 to 14.

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