An oil-gas separator and a diesel engine

Abstract

This utility model discloses an oil-gas separator and a diesel engine, relating to the field of oil-gas separation technology. It includes a housing, a first orifice plate, and a second orifice plate. The housing is provided with an inlet pipe and an outlet pipe. The first and second orifice plates are sequentially arranged in the gas flow path within the housing. The holes in the first and second orifice plates are staggered. The bottom of the inner cavity of the housing is connected to the oil outlet pipe. In this utility model, after the oil-gas mixture enters the housing, larger oil droplets impact the first orifice plate due to inertia and are intercepted by it. Furthermore, the staggered arrangement of the holes in the second and first orifice plates causes the airflow to form a staggered vortex, generating a more complex trajectory. Combined with the interception effect of the non-perforated positions of the second orifice plate, the oil-gas mixture is further separated, improving the oil-gas separation efficiency. Simultaneously, the overall structure is simple, the manufacturing cost is low, and it helps reduce subsequent maintenance costs and difficulties.

Description

Technical Field

[0001] This utility model relates to the field of oil-gas separation technology, and in particular to an oil-gas separator and a diesel engine. Background Technology

[0002] During the operation of a diesel engine, there are intake stroke, compression stroke, power stroke and exhaust stroke. During the compression stroke, the combustion chamber of the cylinder contains only pure air that has been compressed to a high temperature and high pressure. When the compression stroke is nearing its end, the fuel (diesel) is injected directly into this high temperature and high pressure combustion chamber by a high-pressure fuel injector.

[0003] The injected diesel fuel does not mix perfectly with all the air instantly; it is a continuous injection process. The injected diesel fuel jet is torn apart and atomized into tiny droplets in the high-temperature air. The surface of the droplets absorbs heat and begins to evaporate to form fuel vapor. When the fuel vapor concentration and temperature in a local area reach the auto-ignition point, the mixture in that area begins to burn first. At the same time, the injection continues, and new fuel droplets are constantly injected, evaporate, mix, and ignite near the flame front. Subsequent fuel injections need to find and utilize the oxygen in the remaining air near the flame front or in the cylinder for combustion.

[0004] Because fuel injection is continuous, at any given moment in the combustion chamber, there are simultaneously: already burned exhaust gas, a region that is burning intensely, newly injected fuel droplets that are atomizing and evaporating, and the fresh fuel-air mixture around them, as well as the remaining air that has not yet been fully mixed with the fuel. This "diffusion combustion" mode (fuel and oxidizer mixing and burning simultaneously) itself determines that during the combustion process, there is always a region of incompletely burned fuel-air mixture in the combustion chamber.

[0005] Therefore, although most of the air-fuel mixture will burn as much as possible in the combustion chamber, during the extremely short combustion time (milliseconds), especially under conditions such as high load, cold start, poor fuel atomization, and insufficient intake, a portion of the air-fuel mixture that is not completely burned or has just evaporated and has not had time to burn will always be expelled from the cylinder.

[0006] If the discharged oil-gas mixture is not separated, it will not only cause oil loss, but also pollute the surrounding environment. There is also a risk that it will be re-inhaled during the intake stroke of the cylinder, affecting the normal operation of the equipment and reducing its performance and reliability.

[0007] The oil and gas separation equipment known to the applicant currently has certain shortcomings in terms of separation efficiency, stability, and ease of maintenance. For example, some simple oil and gas separators have low separation efficiency and cannot meet increasingly stringent emission and equipment operation requirements; some oil and gas separators have complex structures, resulting in high maintenance costs and high maintenance difficulty.

[0008] Therefore, there is an urgent need for an oil-gas separator with high oil-gas separation efficiency and simple structure. Utility Model Content

[0009] The purpose of this invention is to provide an oil-gas separator and a diesel engine to solve the problems existing in the prior art. It utilizes multiple perforated plates with staggered holes to achieve oil-gas separation, which can improve oil-gas separation efficiency, simplify the overall structure, and reduce maintenance costs and difficulty.

[0010] To achieve the above objectives, the present invention provides the following solution: The present invention provides an oil-gas separator, including a housing, a first orifice plate and a second orifice plate. The housing is provided with an inlet pipe and an outlet pipe. The first orifice plate and the second orifice plate are sequentially arranged on the gas flow path inside the housing. The holes of the first orifice plate and the holes of the second orifice plate are staggered. The bottom of the inner cavity of the housing is connected to the oil outlet pipe.

[0011] Preferably, the oil-gas separator further includes a third orifice plate, which is disposed on the gas flow path within the housing. The third orifice plate is disposed on the side of the second orifice plate away from the first orifice plate, and the holes of the third orifice plate are offset from the holes of the second orifice plate.

[0012] Preferably, a stainless steel filter screen is provided between the second perforated plate and the third perforated plate.

[0013] Preferably, the outer peripheral walls of the first perforated plate, the second perforated plate, the third perforated plate, and the stainless steel filter screen are all matched with the inner peripheral wall of the housing.

[0014] Preferably, both the end of the air inlet pipe away from the housing and the end of the air outlet pipe away from the housing are provided with flanges.

[0015] Preferably, the air inlet pipe and the air outlet pipe are respectively located at the bottom and top of the housing, and the oil outlet pipe is located at the bottom of the housing.

[0016] Preferably, the length of the intake pipe is greater than the length of the outlet pipe.

[0017] Preferably, the shell is a cylindrical structure.

[0018] Preferably, both the first perforated plate and the second perforated plate are welded or bolted to the housing.

[0019] This utility model also provides a diesel engine using the above-mentioned oil-gas separator, including a diesel engine body and the oil-gas separator, wherein the intake pipe of the oil-gas separator is connected to the oil-gas discharge pipe of the diesel engine body.

[0020] The present invention achieves the following main technical effects compared to the prior art:

[0021] After the oil-gas mixture enters the casing, it first impacts the first orifice plate. During this process, larger oil droplets collide with and are trapped by the first orifice plate due to inertia, achieving initial separation of the oil-gas mixture. Furthermore, because the holes of the second orifice plate are misaligned with those of the first orifice plate, the airflow forms a misaligned vortex, generating a more complex trajectory. Combined with the trapping effect of the non-hole positions of the second orifice plate, further separation of the oil-gas mixture is achieved. In other words, by designing the first and second orifice plates, the oil-gas separation efficiency can be improved. At the same time, the overall structure is simple, the manufacturing cost is low, and it is also beneficial to reduce subsequent maintenance costs and maintenance difficulty.

[0022] The other solutions of this utility model achieve the following technical effects compared to the prior art:

[0023] The design of the third orifice plate can also generate a staggered swirling flow of airflow, while trapping oil droplets. Together with the first and second orifice plates, it further improves the oil-gas separation efficiency.

[0024] The stainless steel filter screen between the second and third perforated plates can further improve the interception effect of oil droplets and further improve the oil-gas separation efficiency by relying on its filtration function. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the oil-gas separator in an embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the oil-gas separator in this embodiment of the present invention, as well as a schematic diagram of the gas flow direction (solid arrow) and the oil flow direction (dashed arrow);

[0028] Figure 3 This is a top view of the oil-gas separator in an embodiment of the present invention.

[0029] The components are: 1. Shell; 2. First perforated plate; 3. Second perforated plate; 4. Third perforated plate; 5. Stainless steel filter screen; 6. Inlet pipe; 7. Outlet pipe; 8. Oil outlet pipe; 9. Flange. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The purpose of this invention is to provide an oil-gas separator and a diesel engine to solve the problems existing in the prior art. It utilizes multiple perforated plates with staggered holes to achieve oil-gas separation, which can improve oil-gas separation efficiency, simplify the overall structure, and reduce maintenance costs and difficulty.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Please refer to the following: Figures 1-3 As shown, an oil-gas separator is provided, including a housing 1, a first orifice plate 2, and a second orifice plate 3. The housing 1 is provided with an inlet pipe 6 and an outlet pipe 7. The area between the inlet pipe 6 and the outlet pipe 7 within the inner cavity of the housing 1 forms the gas flow path. The first orifice plate 2 and the second orifice plate 3 are sequentially arranged on the gas flow path within the housing 1. Both the first orifice plate 2 and the second orifice plate 3 are perpendicular to or inclined to the gas flow direction, thus intercepting the airflow. Multiple holes are evenly distributed on the first orifice plate 2 and the second orifice plate 3. The holes in the first orifice plate 2 and the second orifice plate 3 are staggered, allowing for proper mixing of oil and gas. After the material enters the shell 1, it will first impact the first orifice plate 2. During this process, larger oil droplets will impact the first orifice plate 2 due to inertia and be intercepted by the first orifice plate 2, which can achieve the initial separation of oil and gas mixture. Because the holes of the second orifice plate 3 are misaligned with the holes of the first orifice plate 2, the airflow forms a misaligned vortex, which produces a more complex motion trajectory. Combined with the interception effect of the non-hole position of the second orifice plate 3, the separation of oil and gas mixture is further achieved. The bottom of the inner cavity of the shell 1 is connected to the oil outlet pipe 8, so that the oil droplets intercepted in the shell 1 slide to the bottom of the inner cavity of the shell 1 under the influence of their own gravity and flow out from the oil outlet pipe 8 for recycling.

[0034] The shell 1 can be made of stainless steel or other metals that can exchange heat with the external environment. In this way, the oil and gas can exchange heat with the external environment during the flow of oil and gas inside the shell 1, causing the oil and gas near the wall plate of the shell 1 to cool down and condense. Combined with the design of the first orifice plate 2 and the second orifice plate 3, the oil and gas separation efficiency is further improved.

[0035] In some embodiments, the oil-gas separator further includes a third orifice plate 4, which is disposed on the gas flow path within the housing 1. The third orifice plate 4 is perpendicular or inclined to the gas flow direction to intercept the airflow. Multiple holes are uniformly formed on the third orifice plate 4. The third orifice plate 4 is disposed on the side of the second orifice plate 3 away from the first orifice plate 2. The holes of the third orifice plate 4 are staggered with the holes of the second orifice plate 3. The holes of the third orifice plate 4 and the holes of the first orifice plate 2 can be arranged opposite each other or staggered. The design of the third orifice can also cause the airflow to generate staggered swirling flow, while intercepting oil droplets. Together with the first orifice plate 2 and the second orifice plate 3, the oil-gas separation efficiency is further improved.

[0036] A stainless steel filter screen 5 can be installed between the second perforated plate 3 and the third perforated plate 4. The stainless steel material is suitable for oil and gas separation. The filtering effect of the stainless steel filter screen 5, combined with the interception and staggered swirling between the perforated plates, can achieve efficient filtration of oil and gas. The filtered oil droplets are blown away from the stainless steel filter screen 5 by the airflow and their own gravity, and slide to the bottom of the inner cavity of the housing 1, and flow out from the oil outlet pipe 8 for recycling.

[0037] To prevent oil and gas from escaping from the edges of the perforated plate and the stainless steel filter screen 5, the outer peripheral walls of the first perforated plate 2, the second perforated plate 3, the third perforated plate 4, and the stainless steel filter screen 5 are all matched with the inner peripheral wall of the housing 1.

[0038] Both the first perforated plate 2 and the second perforated plate 3 are welded or bolted to the housing 1. When welding, full welding should be used to avoid gaps between the perforated plate and the inner peripheral wall of the housing 1. When bolting, if the outer peripheral wall of the perforated plate matches the inner peripheral wall of the housing 1, a connecting block can be set on the edge of the perforated plate. The screw passes through the housing 1 and the connecting block in sequence and is connected to the nut to complete the bolted connection between the perforated plate and the housing 1.

[0039] When the orifice plate is bolted to the housing 1, the bolts can be removed and the orifice plate replaced when it needs to be replaced later, which improves the convenience of replacement.

[0040] The stainless steel filter screen 5 can be placed directly in the space between the second perforated plate 3 and the third perforated plate 4 without the need for fixing by welding or bolts. Multiple layers of stainless steel filter screen 5 or a thicker stainless steel filter screen 5 can be set between the second perforated plate 3 and the third perforated plate 4 to fill the space between the second perforated plate 3 and the third perforated plate 4, thereby improving the oil-gas separation efficiency.

[0041] In some embodiments, multiple orifice plates, such as a fourth orifice plate and a fifth orifice plate, may be additionally provided. The multiple orifice plates are arranged sequentially along the gas flow path, and the orifice plates are perpendicular or inclined to the gas flow direction. They are set on the gas flow path in a way that intercepts the gas flow, so as to achieve the same effect as the second orifice plate 3 and the third orifice plate 4, thereby improving the oil-gas separation efficiency.

[0042] Flanges 9 are provided at the ends of the air intake pipe 6 and the air outlet pipe 7 that are away from the housing 1, respectively. These flanges can be used to connect to and disconnect from other pipes, improving the ease of installation and disassembly.

[0043] In this embodiment, the air inlet pipe 6 and the air outlet pipe 7 are respectively located at the bottom and top of the housing 1, the oil outlet pipe 8 is located at the bottom of the housing 1, the inner cavity of the overall housing 1 is the gas flow path, and the first perforated plate 2, the second perforated plate 3 and the third perforated plate 4 are horizontally arranged in the inner cavity of the housing 1.

[0044] In some embodiments, the length of the intake pipe 6 can be set to be greater than the length of the outlet pipe 7. The longer intake pipe 6 can play a role in stabilizing the flow, so that the airflow can stably form a staggered vortex between the first orifice plate 2 and the second orifice plate 3.

[0045] The shell 1 is cylindrical or square, and the air inlet pipe 6 and air outlet pipe 7 can be cylindrical or square, etc., as long as they can provide normal airflow space.

[0046] By reducing the cross-sectional area of ​​the intake pipe 6, the airflow can impact the first perforated plate 2 inside the casing 1 at a faster impact speed, thereby improving the initial separation efficiency of oil and gas.

[0047] The intake pipe 6 and the exhaust pipe 7 should be coaxially arranged with the housing 1 to ensure the uniformity of gas flow inside the housing 1.

[0048] The manufacturing process of an oil-gas separator includes: First, preparing a metal plate for the outer shell 1, the material of which must meet the requirements of strength and corrosion resistance, cutting out various parts of the shell 1 according to the design dimensions, including the cylinder, top and bottom sealing plates, etc., opening holes in the top and bottom sealing plates for connecting the air inlet pipe 6 and the air outlet pipe 7, and opening holes in the bottom sealing plate for connecting the oil outlet pipe 8.

[0049] Second, prepare three circular perforated plates with a diameter of 250mm and a thickness of 10mm, which will be used as the first perforated plate 2, the second perforated plate 3 and the third perforated plate 4. According to the design requirements, corresponding holes are machined on the perforated plates with a hole diameter of 8mm. Prepare a stainless steel filter screen 5, the specifications of which need to be adapted to the space between the second perforated plate 3 and the third perforated plate 4.

[0050] Third, prepare an 8mm instrument tube for making an oil outlet pipeline 8, prepare two pipelines as an air inlet pipeline 6 and an air outlet pipeline 7, and prepare flanges 9 and other accessories for connecting with existing oil and gas discharge pipelines.

[0051] Fourth, assemble the cut cylinder and top sealing plate (or bottom sealing plate), and use welding to connect the parts into a cylindrical shell 1. During the welding process, ensure that the weld is uniform and firm, and avoid defects such as missed welds and false welds. After the welding is completed, grind the weld to make its surface smooth.

[0052] Fifth, the prepared first perforated plate 2, second perforated plate 3 and third perforated plate 4 are fixedly connected to the housing 1 by welding or bolting. Before installing the third perforated plate 4, the stainless steel filter screen 5 needs to be laid on the second perforated plate 3, and then the third perforated plate 4 is installed so that the stainless steel filter screen 5 fills the space between the second perforated plate 3 and the third perforated plate 4.

[0053] Sixth, weld the bottom sealing plate (or top sealing plate) that was not installed in step four onto the cylinder of shell 1. Weld the air outlet pipe 7, air inlet pipe 6 and oil outlet pipe 8 at the openings of the top sealing plate and bottom sealing plate. During the welding process, ensure that the weld is uniform and firm, and avoid defects such as missed welds and false welds. Install flanges 9 on the air inlet pipe 6 and air outlet pipe 7.

[0054] Seventh, conduct an airtightness test, seal the air inlet pipe 6, the air outlet pipe 7, and the oil outlet pipe 8, and fill the housing 1 with gas at a certain pressure. Check for gas leaks at each welded part and interface. If a leak is found, repair welding or adjustment should be carried out in time until the sealing requirements are met.

[0055] In actual use, the oil-gas separator allows oil and gas to enter the housing 1 through the inlet pipe 6. First, the first perforated plate 2 traps large oil droplets, completing initial oil-gas separation. After passing through the first perforated plate 2, the airflow undergoes a staggered swirling motion due to the misaligned arrangement of the holes in the second perforated plate 3, creating a more complex trajectory. This, combined with the trapping effect of the non-perforated areas of the second perforated plate 3, further separates the oil-gas mixture. With the stainless steel filter screen 5 and the third perforated plate 4 in place, the oil and gas... After the second perforated plate 3, the oil droplets pass through the stainless steel filter screen 5 and the third perforated plate 4 in sequence. Under the filtering effect of the stainless steel filter screen 5 and the interception effect of the third perforated plate 4, the remaining oil droplets in the oil and gas are separated from the gas. Moreover, during the movement of the airflow in the shell 1, the airflow on the outer periphery will exchange heat with the external environment through the shell 1 and cool down, achieving condensation. The condensed oil droplets and the oil droplets intercepted by the first perforated plate 2, the second perforated plate 3, the stainless steel filter screen 5 and the third perforated plate 4 will all slide to the bottom of the inner cavity of the shell 1 and then flow out from the oil outlet pipe 8 for recycling.

[0056] The present invention also provides a diesel engine using the above-mentioned oil-gas separator, including a diesel engine body and an oil-gas separator, wherein the intake pipe 6 of the oil-gas separator is connected to the oil-gas exhaust pipe of the diesel engine body to perform oil-gas separation treatment on the exhaust.

[0057] Taking an oil-gas separator with a first orifice plate 2, a second orifice plate 3, a third orifice plate 4, and a stainless steel filter screen 5 as an example, it is applied to a diesel engine in the field. The engine is a 16V280ZD-G type diesel engine produced by CNR Yuchai, with a maximum operating power of 4000kW and a rated power of 4200kW.

[0058] The following data were collected during the actual operation of the diesel engine:

[0059] Oil drain data: Before installing this oil-gas separator, the engine ran continuously for 30 days and the oil consumption was 20L; after installing this oil-gas separator, the engine ran continuously for 30 days and the oil drain was reduced to 5L, and 15L of oil was recovered, reducing the drain by about 75%.

[0060] Separation efficiency data: By detecting the oil and gas composition of the inlet pipe 6 and the outlet pipe 7, the average oil content (volume ratio) in the oil and gas mixture of the inlet pipe 6 is 5%, and the average oil content (volume ratio) in the gas discharged from the outlet pipe 7 is 0.5%, with a separation efficiency of 90%.

[0061] Operating data for airflow:

[0062] Relationship between flow rate and separation efficiency: When the average air velocity in the oil-gas separator is 10 m / s, the separation efficiency is 85%; when the flow rate is increased to 15 m / s, the separation efficiency increases to 90%; however, when the flow rate is further increased to 20 m / s, the separation efficiency drops to 88%. This indicates that within a certain range, appropriately increasing the air velocity helps to improve the separation efficiency, but beyond a certain threshold, excessively high flow rates will interfere with the oil droplet separation process, leading to a decrease in separation efficiency.

[0063] Relationship between flow rate and separation efficiency: The flow rate of the oil-gas mixture varies under different engine loads. When the flow rate of the oil-gas mixture is 50 m³ / s... 3 At a flow rate of 80 m³ / h, the oil content (by volume) in the gas discharged from outlet pipe 7 is 0.4%; when the flow rate increases to 80 m³ / h... 3 At a flow rate of [number] h, the oil content (by volume) in the gas discharged from outlet pipe 7 increased to 0.6%. This indicates that as the flow rate of the air and oil-gas mixture increases, the separation becomes more difficult, and the oil content in the gas discharged from outlet pipe 7 will increase.

[0064] The effect of flow field uniformity on separation: After optimizing the air flow field uniformity in the separator by designing the inner wall of the shell 1 to be circular, the separation efficiency increased from 88% to 92%. This shows that a uniform air flow field helps oil droplets to separate from the gas more stably and improves the overall separation efficiency.

[0065] The above data shows that this oil-gas separator significantly reduces oil consumption in practical applications, has high separation efficiency, and effectively ensures the stable operation of diesel engines. At the same time, the airflow state has a significant impact on the separation efficiency.

[0066] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0067] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An oil and gas separator characterized by, The device includes a housing, a first orifice plate, and a second orifice plate. The housing is provided with an air inlet pipe and an air outlet pipe. The first orifice plate and the second orifice plate are sequentially arranged on the gas flow path inside the housing. The holes of the first orifice plate and the holes of the second orifice plate are staggered. The bottom of the inner cavity of the housing is connected to the oil outlet pipe.

2. The oil and gas separator of claim 1, wherein, The oil-gas separator also includes a third orifice plate, which is disposed on the gas flow path within the housing. The third orifice plate is disposed on the side of the second orifice plate away from the first orifice plate, and the holes of the third orifice plate are offset from the holes of the second orifice plate.

3. The oil-gas separator according to claim 2, characterized in that, A stainless steel filter screen is provided between the second perforated plate and the third perforated plate.

4. The oil-gas separator according to claim 3, characterized in that, The outer peripheral walls of the first perforated plate, the second perforated plate, the third perforated plate, and the stainless steel filter screen all match the inner peripheral wall of the housing.

5. The oil-gas separator according to claim 1, characterized in that, Flanges are provided at the end of the air inlet pipe away from the housing and at the end of the air outlet pipe away from the housing.

6. The oil-gas separator according to claim 1, characterized in that, The air intake pipe and the air outlet pipe are respectively located at the bottom and top of the housing, and the oil outlet pipe is located at the bottom of the housing.

7. The oil-gas separator according to claim 1, characterized in that, The length of the intake pipe is greater than the length of the outlet pipe.

8. The oil-gas separator according to claim 1, characterized in that, The shell has a cylindrical structure.

9. The oil-gas separator according to claim 1, characterized in that, Both the first orifice plate and the second orifice plate are welded or bolted to the housing.

10. A diesel engine, characterized in that, The oil-gas separator as described in any one of claims 1-9 includes a diesel engine body and the oil-gas separator, wherein the intake pipe of the oil-gas separator is connected to the oil-gas discharge pipe of the diesel engine body.

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