Modular multi-stage oil and gas separator assembly

Abstract

The application discloses a modular multi-stage oil-gas separator assembly, which comprises a base body and a shell covering the base body, characterized in that the base body comprises a plate body, a Tesla valve flow channel, an acceleration hole group, a multi-stage hole plate assembly, an impact plate assembly and a filter element assembly are sequentially arranged on the lower right side, the right end, the upper right side, the upper middle part and the upper left side of the plate body, and the Tesla valve flow channel, the acceleration hole group, the multi-stage hole plate assembly, the impact plate assembly and the filter element assembly constitute a gas flow channel; a first-stage cavity is formed between the Tesla valve flow channel and the acceleration hole group; a second-stage cavity is formed between the acceleration hole group and the multi-stage hole plate assembly; a third-stage cavity is formed between the multi-stage hole plate assembly and the impact plate assembly; a fourth-stage cavity is formed between the impact plate assembly and the filter element assembly; a fifth-stage cavity is formed around the filter element assembly; a third-stage oil return hole is arranged at the low position of the third-stage cavity; a fourth-stage oil return hole is arranged at the low position of the fourth-stage cavity; the fourth-stage cavity is connected to a filter element seat through a channel; the filter element assembly is clamped on the filter element seat; and a fifth-stage oil return hole is arranged at the low position of the fifth-stage cavity.

Description

Technical Field

[0001] This technical solution relates to an oil-gas separator, and more particularly to a modular multi-stage oil-gas separator assembly. Background Technology

[0002] As we all know, the oil-gas separator is an important component installed in the engine system. Its main function is to separate the oil mist generated in the engine from the gas, which can protect the engine system, improve fuel efficiency, and reduce environmental pollution.

[0003] Based on user feedback and analysis of existing technologies, the following main shortcomings were identified: First, the oil-gas separation effect is poor. Most existing separators are only one or two-stage separators, and the separated gas still has a high oil content. Second, space utilization is low. Vehicle interiors are very small, and the limited installation space prevents the installation of complex and efficient medium-to-large-sized separators. Small separators often have poor separation performance, and achieving optimal oil-gas separation within limited space is a significant technical challenge. Third, compatibility is low. Most existing oil-gas separators are designed and developed only for a single engine model, making serial or modular production impossible. This means that one type of oil-gas separator can only be matched with one type of engine. Product development requires high investment and has a long development cycle. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a modular multi-stage oil-gas separator assembly. This assembly features excellent oil-gas separation performance and high space utilization, and also solves the problem of rapid adaptation to different engine operating conditions, thereby reducing investment and shortening the development cycle. The specific solution is as follows.

[0005] A modular multi-stage oil-gas separator assembly includes a base and a housing covering the base. The base comprises a plate with the following portions: lower right side, right end, upper right side, upper middle section, and upper left side (as shown in the attached diagram). Figure 6The gas flow path is arranged in a counter-clockwise direction as follows: Tesla valve flow channel, acceleration orifice group, multi-stage orifice plate assembly, impact plate assembly, and filter element assembly. These components form the gas flow path. The Tesla valve flow channel and acceleration orifice group form a primary chamber; the acceleration orifice group and multi-stage orifice plate assembly form a secondary chamber; the multi-stage orifice plate assembly and impact plate assembly form a tertiary chamber; the impact plate assembly and filter element assembly form a quaternary chamber; and the filter element assembly is surrounded by a quinary chamber. A secondary oil return port is located at the lower position within each of the secondary chambers. The third-stage cavity has a third-stage oil return hole at its lower position, which is connected to the third-stage oil return pipe. The fourth-stage cavity has a fourth-stage oil return hole at its lower position, which is connected to the fourth-stage oil return pipe. The fourth-stage cavity is connected to the filter element seat through a channel, and the filter element assembly is snapped onto the filter element seat. The fifth-stage cavity has a fifth-stage oil return hole at its lower position, which is connected to the fifth-stage oil return pipe. The interface between the third, fourth, and fifth-stage cavities is separated by a partition. The third, fourth, and fifth-stage oil return pipes pass through the plate and extend to the bottom of the plate.

[0006] The right end of the inner wall of the housing is provided with an oil baffle (grid) and is located above the acceleration hole group. The left side of the housing has a through hole and a removable cover is provided in the through hole. The through hole is located above the filter element assembly. The housing has an exhaust port on the side wall near the filter element assembly.

[0007] The Tesla valve flow channels are arranged in multiple sets side by side.

[0008] The aforementioned acceleration hole group specifically comprises multiple distributed acceleration holes that penetrate the plate and connect the primary cavity and the secondary cavity. The diameters of the acceleration holes may be the same or different.

[0009] The multi-stage orifice plate assembly includes an orifice plate holder with internal flow channels. A door frame is provided on the inlet side of the orifice plate holder. Several slots are spaced apart on the seat body, and a corresponding orifice plate is inserted into each slot. The size of the orifice plate matches the inner wall size of the orifice plate holder. The door frame ensures the multi-stage orifice plate assembly is securely fastened to the plate body. The orifice sizes on different orifice plates are different; preferably, along the gas flow direction, the orifice sizes on different orifice plates are staggered or progressively smaller. To prevent incorrect insertion of the orifice plate into the slots, each orifice plate and slot has a corresponding positioning structure. This positioning structure refers to a matching positioning protrusion and positioning groove at the junction of the orifice plate and slot.

[0010] The impact plate assembly includes an impact plate seat with an internal flow channel, an impact perforated plate inserted into the impact plate seat, and several small holes on the impact perforated plate. To further improve the oil-gas separation effect, a needle plate is provided on the inner wall of the impact plate seat, and the flow channel outlet is located at the bottom of the impact plate seat.

[0011] The filter assembly includes a frame, with a top cover snapped onto the top of the frame and a bottom cover snapped onto the bottom. Filter cotton is fitted onto the outside of the frame. A safety valve is installed in the center of the top cover, consisting of a top disc and a bottom rod. The rod extends through the top cover into the interior of the filter element. A baffle is located at the bottom of the rod, and a spring is fitted onto the rod, positioned between the top cover and the baffle.

[0012] The plate body is provided with a perimeter wall around its perimeter, and a ring edge is separated by the perimeter wall. The edge of the shell is provided with a ring of cover edge, which matches the perimeter wall and the perimeter edge to seal the junction of the plate body and the shell.

[0013] The plate and the shell are snapped together. This snapping refers to the presence of matching grooves and latches on the interface between the plate and the shell.

[0014] A sealing ring is provided at the junction of the plate and the bottom of the housing. When this product is installed on the crankcase, the sealing ring can not only isolate the outside environment and prevent the leakage of unseparated exhaust gas, but also further enhance the sealing effect at the junction of the plate and the housing, preventing gas from leaking through the junction.

[0015] At least one check valve is installed at the bottom of the third, fourth, and fifth stage return oil pipes. This check valve is an umbrella valve (or return oil umbrella valve), consisting of a tubular valve body and an umbrella-shaped valve core, which is elastic. When sufficient oil accumulates in the return oil pipe, gravity opens the valve core, allowing the separated oil to flow back to the crankcase. After the oil overflows, the elastic valve core returns to its original position, sealing the bottom of the return oil pipe and preventing unseparated oil and gas from entering the pipe. Finished return oil umbrella valves can be purchased.

[0016] The directional terms "up," "down," "left," and "right" used in the above records are for illustrative purposes only. Figure 4 Appendix Figure 15 The orientation is based on the following: the direction of the cover is up, the direction of the return oil pipe is down, the direction of the acceleration hole is right, and the direction of the filter element is left. The directional terms are only for the purpose of clearly describing this device and understanding the structure of this solution.

[0017] The principle of this technical solution is as follows: 1. Install the housing: After the housing and cover are sealed, each cavity is effectively isolated, and the internal airflow can only flow in the following order: crankcase → Tesla valve flow channel → first stage cavity → acceleration orifice group → second stage cavity → multi-stage orifice plate assembly → third stage cavity → impact plate assembly → fourth stage cavity → filter element assembly → fifth stage cavity → exhaust port → atmosphere; 2. Install and secure the product onto the crankcase: The crankcase has three pre-drilled openings: the first return port, the second return port, and the third return port. The first return port matches the fourth and fifth stage oil return pipes; the second return port corresponds to the third stage oil return pipe and the Tesla valve inlet, and also serves as an exhaust port; the third return port is a slotted orifice matching the second stage oil return port. The third, fourth, and fifth stage oil return pipes extend into their respective return ports on the crankcase. During operation: (1) After the exhaust gas rises, it first enters the Tesla valve flow channel through the second return port (exhaust port). The Tesla valve flow channel accelerates the exhaust gas and uses the difference in weight between gas and liquid to separate the exhaust gas by inertia, thus achieving primary separation. The separated gas enters the primary chamber, and the separated oil flows back to the crankcase exhaust port along the interface between the device and the crankcase. (2) Driven by the gas, the exhaust gas in the primary chamber passes through the acceleration hole group composed of multiple acceleration holes and enters the secondary chamber. The acceleration holes guide the exhaust gas to accelerate and impact the grid plate at the top of the secondary chamber, realizing secondary separation. The separated oil will collect on the grid plate and flow down the inner wall of the housing and seat to a lower position. Finally, it will flow out through the secondary oil return port at the lowest position of the secondary chamber and flow back into the crankcase through the third return port. (3) Driven by the gas, the exhaust gas in the secondary chamber passes through the multi-stage orifice plate assembly and enters the tertiary chamber. Several multi-stage orifice plates are inserted in the flow channel of the multi-stage orifice plate assembly. The diameter of the holes on the orifice plates decreases step by step and is staggered. When the exhaust gas passes through the holes, it is impacted and separated in three stages. The separated oil enters the tertiary return oil pipe through the tertiary return oil hole at the lower position of the tertiary chamber and finally flows back to the crankcase. (4) Driven by the gas, the exhaust gas in the third-stage chamber passes through the impact plate assembly and enters the fourth-stage chamber. The impact plate assembly consists of an impact plate seat and an impact orifice plate. Several small holes are distributed on the impact orifice plate. The small holes can accelerate the airflow. The inner wall of the impact plate seat is provided with a needle plate. The exhaust gas passes through the small holes and impacts the needle plate for four-stage separation. The separated oil flows down along the needle plate to the fourth-stage oil return hole, and finally flows back to the crankcase through the fourth-stage oil return pipe. (5) After four stages of separation, the oil content of the exhaust gas is already very low. Driven by the gas, the exhaust gas in the fourth stage chamber enters the filter assembly through the channel and undergoes five stages of separation through the precision filter material (filter cotton or filter element). When the exhaust gas penetrates the filter material: ① the oil separated inside the filter element flows back to the fourth stage oil return pipe through the channel on the inner surface of the filter element; ② the oil separated outside the filter element flows back to the fifth stage oil return hole along the plate at the bottom of the fifth stage chamber and then back to the crankcase through the fifth stage oil return pipe. Finally, after five stages of separation, the exhaust gas is tangentially discharged to the atmosphere through the exhaust port.

[0018] This device has multiple separation stages, excellent separation effect, and each stage of components is compact with high space utilization. It is compatible with a variety of engines, truly achieving the technical effect of saving space and having a wide range of applications.

[0019] After testing the separation efficiency of five existing oil-gas separators, the test method was "Technical Conditions and Test Methods for Oil-Gas Separators in Diesel Engine Crankcases (Standard No.: QC / T812-2009)": The separation efficiency of the five existing oil-gas separators was between 71% and 77%, while the separation efficiency of this device reached 97% to 98%, which means that the unseparated oil was reduced from 28% to 23% to 2% to 3%. It can be seen that this solution significantly improves the oil-gas separation effect: (1) The recovered oil flows back to the crankcase, which improves the engine oil utilization rate, reduces fuel consumption, and indirectly improves the overall economic efficiency of the engine; (2) Using this equipment can reduce the emission of a large amount of oil particles and exhaust particulate matter in the exhaust gas every year, which is of great significance for energy conservation and environmental protection.

[0020] Further explanation of this technical solution: 1. In this solution, one-way valves can be installed at the bottom of the third, fourth, and fifth stage return oil pipes. This application provides a preferred embodiment of a return oil umbrella valve, which consists of a tubular valve body and an umbrella-shaped valve core. The valve core is elastic. When the oil in the return oil pipe accumulates to a sufficient amount, the valve core opens under gravity, allowing the separated oil to flow back to the crankcase. After the oil overflows, the umbrella-shaped valve core returns to its original position and closes the bottom of the return oil pipe under elastic action, preventing unseparated oil and gas from entering the pipe. The return oil umbrella valve can be purchased as a finished product, or other one-way valves can be selected. 2. In this solution, the filter assembly can be replaced by removing the cover on the housing. This application provides a preferred embodiment of the filter assembly, which consists of a safety valve, a filter cover, a frame, filter cotton, and other structures. When the filter fails and reaches its replacement cycle, the internal pressure of the filter increases. The safety valve overcomes the spring force and moves upward to open and release pressure, protecting the engine internal pressure within the specified range. After the pressure is released, the spring counteracts and pushes the valve cap, which in turn drives the safety valve to reset and close the filter cover. 3. In this solution, since the multi-stage perforated plate assembly, impact plate assembly, and filter element assembly are all detachable and replaceable, the multi-stage perforated plate in the multi-stage perforated plate assembly and the impact perforated plate in the impact plate assembly are also detachable and replaceable. Therefore, technicians can study the operating conditions of different engine models to match different perforated plates or components, assemblies, and their combinations, achieving modular management, which greatly reduces R&D costs and shortens the R&D cycle. 4. This device can be fixed with bolts, requiring only matching screw holes on the housing and crankcase. Alternatively, it can be fixed to the crankcase by snap-fit, requiring only matching buckles and slots. Both are existing technologies and will not be elaborated upon. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the overall components of the present invention. Figure 2This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 3 This is a top view of the plate structure of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the plate body of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the plate structure from below in this invention; Figure 6 This is a three-dimensional structural diagram of the disassembled base of the present invention; Figure 7 This is a three-dimensional structural diagram of the disassembled multi-level perforated plate assembly of the present invention; Figure 8 This is a three-dimensional structural diagram of the impact plate assembly of the present invention after disassembly; Figure 9 This is a schematic cross-sectional view of the filter assembly of the present invention; Figure 10 This is a three-dimensional structural diagram of the disassembled filter assembly of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the seat body after assembly according to the present invention; Figure 12 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 13 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ; Figure 14 This is a schematic diagram of the structure of the present invention viewed from below; Figure 15 This invention explains the principle of waste gas flow. Figure 1 ; Figure 16 This invention explains the principle of waste gas flow. Figure 2 ; Figure 17 This is a schematic diagram of the three-dimensional structure of the plate body of the present invention. Figure 2 ; Figure 18 This is a top view of the housing structure of the present invention; Figure 19 This is a schematic diagram of the main structure of the present invention; Figure 20 This is a schematic diagram of the main structure of the invention after installation; Figure 21 This is a top view of the structure of the present invention after installation; Figure 22 This is a schematic diagram of the three-dimensional structure of the present invention after installation.

[0022] Explanation of reference numerals in the attached drawings: 1. Shell, 1-1. Shell body, 1-2. Exhaust port, 1-3. Grille, 1-4. Cover edge.

[0023] 2. Body, 2-1 Tesla valve flow channel, 2-2 Acceleration orifice group, 2-3 Secondary oil return port, 2-4 Tertiary oil return pipe, 2-5 Quaternary oil return pipe, 2-6 Fifth-stage oil return pipe, 2-7 Tertiary oil return hole, 2-8 Filter element seat, 2-9 Partition plate, 2-10 Quaternary oil return hole, 2-11 Channel, 2-12 Plate, 2-13 Along the wall, 2-14 Along the edge, 2-15 Snap-fit, 3 Sealing ring, 4 Cover, 5 Multi-stage orifice plate assembly, 5-1 Orifice plate, 5-2 Hole 5-3 Positioning protrusion, 5-4 Door frame, 5-5 Slot, 6 Impact plate assembly, 6-1 Impact hole plate, 6-2 Impact plate seat, 6-3 Needle plate, 6-4 Flow channel outlet, 7 Filter element assembly, 7-1 Safety valve, 7-2 Filter element top cover, 7-3 Spring, 7-4 Baffle, 7-5 Frame, 7-6 Filter cotton, 7-7 Filter element bottom cover, 8 Oil return umbrella valve, 9 Crankcase, K1 Primary chamber, K2 Secondary chamber, K3 Tertiary chamber, K4 Quaternary chamber, K5 Fifth chamber. Detailed Implementation

[0024] Example 1, see appendix Figure 1-22 A modular multi-stage oil-gas separator assembly includes a base 2 and a housing 1 covering the base. The base includes plates 2-12, with the plates located on the lower right side, right end, upper right side, upper middle, and upper left side (as shown in the attached diagram). Figure 6 (Counterclockwise) Sequentially arranged are a Tesla valve flow channel 2-1, an acceleration orifice group 2-2, a multi-stage orifice plate assembly 5, an impact plate assembly 6, and a filter element assembly 7. A primary cavity K1 is formed between the Tesla valve flow channel and the acceleration orifice group; a secondary cavity K2 is formed between the acceleration orifice group and the multi-stage orifice plate assembly; a tertiary cavity K3 is formed between the multi-stage orifice plate assembly and the impact plate assembly; a quaternary cavity K4 is formed between the impact plate assembly and the filter element assembly; and a quinary cavity K5 is formed between the filter element assembly and the housing. A secondary oil return port 2-3 is located at a low position within the secondary cavity. The tertiary cavity... The lower part of the cavity is provided with a three-stage oil return hole 2-7, which is connected to the three-stage oil return pipe 2-4. The lower part of the fourth-stage cavity is provided with a fourth-stage oil return hole 2-10, which is connected to the fourth-stage oil return pipe 2-5. The fourth-stage cavity is connected to the filter element seat 2-8 through the channel 2-11. The filter element assembly is snapped onto the filter element seat. The lower part of the fifth-stage cavity is provided with a fifth-stage oil return hole, which is connected to the fifth-stage oil return pipe 2-6. The interface of the third, fourth and fifth-stage cavities is separated by a partition 2-9. The third, fourth and fifth-stage oil return pipes pass through the plate and extend to the bottom of the plate.

[0025] See appendix Figure 1-5 The housing includes a box-shaped body 1-1, with arranged grids 1-3 on the right end of the inner wall of the body and located above the acceleration hole group. A through hole is opened on the left side of the housing and a removable cover 4 is provided in the through hole. The through hole is located above the filter assembly. An exhaust port 1-2 is provided on the side wall of the housing near the filter assembly.

[0026] The Tesla valve flow channels are arranged in multiple sets side by side.

[0027] See appendix Figure 12-15 The aforementioned acceleration hole group has multiple acceleration holes distributed throughout the plate and connecting the upper and lower spaces of the base. The diameters of the acceleration holes may be the same or different.

[0028] See appendix Figure 6-7 The multi-stage orifice plate assembly 5 includes an orifice plate seat 5-2 with internal flow channels. A door frame 5-4 is provided on the inlet side of the orifice plate seat. Several slots 5-5 are spaced apart on the seat body. Several orifice plates 5-1 are inserted into their corresponding slots, and the size of the orifice plates matches the inner wall size of the orifice plate seat. The door frame ensures the multi-stage orifice plate assembly is tightly secured to the plate body. The orifice plates have different hole sizes; preferably, the hole sizes decrease sequentially along the gas flow direction. To prevent incorrect insertion of the orifice plates into the slots, each orifice plate and slot has a corresponding positioning structure. This positioning structure refers to a positioning protrusion 5-3 and a positioning groove that cooperate with each other at the junction of the orifice plate and the slot.

[0029] See appendix Figure 6 , 8 The impact plate assembly 6 includes an impact plate seat with an internal flow channel, an impact perforated plate 6-1 embedded in the impact plate seat 6-2, and the impact perforated plate has several small holes. To further improve the oil-gas separation effect, the inner wall of the impact plate seat is provided with a needle plate 6-3, and the flow channel outlet 6-4 is located at the bottom of the impact plate seat.

[0030] See appendix Figure 6 , 9 10. The filter element assembly 7 includes a frame 7-5, a filter element top cover 7-2 snapped onto the top of the frame, a filter element bottom cover 7-7 snapped onto the bottom of the frame, and filter cotton 7-6 fitted onto the outside of the frame. A safety valve 7-1 is provided with an opening in the middle of the filter element top cover. The safety valve consists of a top disc and a bottom rod. The rod extends through the filter element top cover into the interior of the filter element. A baffle 7-4 (also called a valve cap) is provided at the bottom of the rod. A spring 7-3 is fitted onto the rod, and the spring is located between the filter element top cover and the baffle.

[0031] See appendix Figure 1-5 The plate body has perimeter walls 2-13, which divide the plate body into a ring of edges 2-14. The shell edge has a ring of covers 1-4, which match the perimeter walls and edges to seal the junction between the plate body and the shell. The plate body and the shell are fixed together by snap-fit. This snap-fit ​​refers to the presence of matching grooves and buckles 2-15 on the interface between the plate body and the shell.

[0032] See appendix Figure 1 , 14A sealing ring 3 is provided at the junction of the plate and the bottom of the housing. When this product is installed on the crankcase 9, the sealing ring can not only isolate the outside world and prevent the leakage of unseparated exhaust gas, but also further enhance the sealing effect at the junction of the plate and the housing, preventing gas from leaking through the junction.

[0033] See appendix Figure 15 One-way valves can be installed at the bottom of the third, fourth, and fifth stage oil return pipes. These one-way valves are umbrella valves (or return oil umbrella valves 8), consisting of a tubular valve body and an umbrella-shaped valve core, which is elastic. When sufficient oil accumulates in the return pipe, gravity opens the valve core, allowing the separated oil to flow back to the crankcase. After the oil overflows, the elastic valve core returns to its original position, sealing the bottom of the return pipe and preventing unseparated oil and gas from entering the pipe. Finished return oil umbrella valves can be purchased.

[0034] The directional terms "up," "down," "left," and "right" used in the above records are for illustrative purposes only. Figure 4 Appendix Figure 15 The orientation is based on the following directions: the direction of the cover is up, the direction of the return oil pipe is down, the direction of the acceleration hole is right, and the direction of the filter element is left. The directional terms are only for the purpose of clearly describing this device and understanding the structure of this solution.

Claims

1. A modular multi-stage oil-gas separator assembly, comprising a base and a housing covering the base, characterized in that, The base includes a plate. On the lower right, right end, upper right, upper center, and upper left of the plate, a Tesla valve flow channel, an acceleration orifice group, a multi-stage orifice plate assembly, an impact plate assembly, and a filter element assembly are sequentially arranged. These constitute the gas flow channel. The Tesla valve flow channel and the acceleration orifice group form a primary cavity; the acceleration orifice group and the multi-stage orifice plate assembly form a secondary cavity; the multi-stage orifice plate assembly and the impact plate assembly form a tertiary cavity; the impact plate assembly and the filter element assembly form a quaternary cavity; and the filter element assembly is surrounded by a quinary cavity. A secondary oil return port is located at a low position within the secondary cavity; a tertiary oil return hole is located at a low position within the tertiary cavity, connecting to a tertiary oil return pipe; and a quaternary oil return pipe is located at a low position within the quaternary cavity. The fourth-stage oil return hole connects to the fourth-stage oil return pipe. The fourth-stage chamber is connected to the filter element seat through a channel. The filter element assembly is snapped onto the filter element seat. The fifth-stage chamber has a fifth-stage oil return hole at its low position, which connects to the fifth-stage oil return pipe. The interface between the third, fourth, and fifth-stage chambers is separated by a partition. The third, fourth, and fifth-stage oil return pipes pass through the plate and extend to the bottom of the plate. The right end of the inner wall of the housing has an arranged oil baffle plate located above the acceleration hole group. The left side of the housing has a through hole with a removable cover inside. The through hole is located above the filter element assembly. The side wall of the housing near the filter element assembly has an exhaust port. The acceleration hole group has multiple acceleration holes distributed throughout. The acceleration holes pass through the plate and connect the first-stage chamber and the second-stage chamber. The impact plate assembly includes an impact plate seat with an internal flow channel, an impact perforated plate inserted into the impact plate seat, and the impact perforated plate having several small holes. The inner wall of the impact plate seat is provided with a needle plate, and the flow channel outlet is located at the bottom of the impact plate seat; The filter assembly includes a frame, a filter top cover snapped onto the top of the frame, a filter bottom cover snapped onto the bottom of the frame, and filter cotton fitted on the outside of the frame. A safety valve is provided with an opening in the middle of the filter top cover. The safety valve consists of a disc at the top and a rod at the bottom. The rod extends through the filter top cover into the interior of the filter element. A baffle is provided at the bottom of the rod. A spring is fitted on the rod and is located between the filter top cover and the baffle. At least one check valve is installed at the bottom of the third, fourth, and fifth stage return oil pipes.

2. The modular multi-stage oil-gas separator assembly according to claim 1, characterized in that, The multi-stage orifice plate assembly includes an orifice plate seat with internal flow channels, a door frame on the inlet side of the orifice plate seat, and several slots spaced apart on the seat body. Each slot contains a corresponding orifice plate, and the size of the orifice plate matches the size of the inner wall of the orifice plate seat. Along the gas flow direction, the holes on different orifice plates are staggered or decrease in size sequentially.

3. A modular multi-stage oil-gas separator assembly according to claim 2, characterized in that, The perforated plate and the slot are each provided with a corresponding positioning structure. The positioning structure refers to the positioning protrusion and positioning groove that cooperate with each other at the junction of the perforated plate and the slot.

4. A modular multi-stage oil-gas separator assembly according to claim 1, characterized in that, The plate body is provided with a perimeter wall around its perimeter, and a ring edge is separated by the perimeter wall. The edge of the shell is provided with a ring of cover edge, which matches the perimeter wall and the ring edge.

5. A modular multi-stage oil-gas separator assembly according to claim 1, characterized in that, The plate and the shell are snapped together. The snapping means that the interface between the plate and the shell is provided with mutually cooperating slots and buckles.

6. A modular multi-stage oil-gas separator assembly according to claim 1, characterized in that, A sealing ring is provided at the junction of the plate and the bottom of the shell.

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