Oil mist tank for ship

Abstract

The invention relates to the technical field of ship outfitting engineering, and discloses an oil mist tank for a ship. The oil mist tank comprises a tank body, a ventilation bent pipe, a ventilation grille, an upper oil baffle plate and a lower oil baffle plate, a containing space is arranged in the box body, one end of the ventilation bent pipe is arranged in the containing space and used for guiding oil gas into the containing space, an exhaust port is formed in one end of the ventilation bent pipe, a gas outlet is formed in one side wall of the box body, and the ventilation grille is arranged at the gas outlet, connected to the box body and used for exhausting gas. The upper oil baffle plate is connected to the top of the box body, the lower oil baffle plate is connected to the bottom of the box body, a first gap is formed between the oil baffle plate and the bottom of the box body, a second gap is formed between the upper oil baffle plate and the lower oil baffle plate, a third gap is formed between the lower oil baffle plate and the top of the box body, and the exhaust port, the first gap, the second gap, the third gap and the air outlet are sequentially communicated. By arranging the upper oil baffle plate and the lower oil baffle plate, the discharged oil gas is intercepted, so that the oil stain pollution of the ventilation grille and the exposed deck is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship outfitting engineering, in particular to a ship oil mist box. Background Art

[0002] Marine oil mist boxes are commonly used in ship outfitting projects, primarily used to isolate and discharge oil and gas from the crankcase of generator sets. Typically, these boxes are located on the skylight deck and connected to the main hull structure. They are equipped with ventilation grilles for exhaust.

[0003] However, since the exhaust gas typically contains a high content of oil vapor, with oil saturation far exceeding that of water, and a large temperature difference between the inside and outside of the grille, the grille can become filled with oil after prolonged use, leaving a large amount of oil stains on the exposed deck. Therefore, it is necessary to optimize the design of the oil mist box structure to reduce the amount of oil vapor passing through the grille. Summary of the Invention

[0004] The purpose of the present invention is to provide a marine oil mist box with high separation efficiency and low maintenance cost.

[0005] In order to achieve the above object, the present invention provides a marine oil mist box comprising a box body, a ventilating elbow, a ventilation grille, an upper oil baffle and a lower oil baffle;

[0006] The box body is used to be fixedly connected to the main hull and is arranged on the open deck surface. A accommodating space is provided in the box body. The vent elbow is hollow. One end of the vent elbow is arranged in the accommodating space for introducing oil and gas into the accommodating space. An exhaust port is provided at one end of the vent elbow arranged in the accommodating space. An air outlet is opened on one side wall of the box body. A ventilation grille is arranged at the air outlet and is connected to the box body and is used to discharge gas.

[0007] The upper oil baffle plate and the lower oil baffle plate are accommodated in the accommodating space, the upper oil baffle plate is fixedly connected to the top of the box body, and the lower oil baffle plate is fixedly connected to the bottom of the box body;

[0008] A first gap is provided between the upper oil baffle plate and the bottom of the box body, a second gap is provided between the upper oil baffle plate and the lower oil baffle plate, and a third gap is provided between the lower oil baffle plate and the top of the box body;

[0009] The exhaust port, the first gap, the second gap, the third gap and the air outlet are connected in sequence.

[0010] Preferably, there are multiple vent bends, which are spaced apart along the extension direction of the box body.

[0011] Preferably, the upper oil baffle plate and the lower oil baffle plate both extend in the vertical direction.

[0012] Preferably, the height of the accommodating space in the vertical direction is defined as H, and the height of the upper oil baffle in the vertical direction is defined as H1, which satisfies the following relationship:

[0013] Preferably, the height of the lower oil baffle in the vertical direction is defined as H2, which satisfies the following relationship:

[0014]

[0015] Preferably, the marine oil mist box also includes an oil baffle fixing ring, the number of which is at least two, the oil baffle fixing ring being fixedly connected to the box body and located in the accommodating space, and the upper oil baffle and the lower oil baffle being detachably connected to the oil baffle fixing ring by bolt fasteners respectively.

[0016] Preferably, there are multiple oil baffle fixing rings, and the multiple oil baffle fixing rings are arranged on two opposite sides of the accommodating space and are spaced apart.

[0017] Preferably, the thickness of the upper oil baffle plate and the lower oil baffle plate are both 4 mm to 8 mm.

[0018] Preferably, the wall thickness of the box body is 5 mm to 9 mm.

[0019] Compared with the prior art, the marine oil mist box according to the embodiment of the present invention has the following beneficial effects:

[0020] (1) After being discharged, the oil and gas first encounter the upper oil baffle with a lower temperature. The temperature of the discharged oil and gas is about 70℃~95℃, and the ambient temperature of the upper oil baffle is about 40℃, with a temperature difference of 30℃-55℃. Since the oil content in the oil and gas is much higher than that in water, the temperature difference causes part of the oil and gas to condense into liquid oil and adhere to the surface of the upper oil baffle, intercepting and separating part of the oil for the first time, reducing the oil content in the subsequent flowing oil and gas, thereby reducing the amount of condensable oil in the gas finally discharged to the ventilation grille, and directly reducing the accumulation of oil stains on the outer surface of the ventilation grille.

[0021] (2) The remaining oil and gas that are not completely separated by the upper oil baffle continue to flow. When they encounter the lower oil baffle, due to the consumption of kinetic energy and the temperature difference again, some of the oil and gas will condense again. At the same time, the gas with reduced kinetic energy tends to sink to the bottom of the box under the action of gravity, and the low temperature environment at the bottom further promotes the condensation of oil and gas. The lower oil baffle plays a role in secondary interception and promoting sedimentation, further reducing the concentration of oil and gas that are finally discharged through the ventilation grille. Most of the gas passing through the ventilation grille is water vapor, which reduces the oil that condenses and adheres to the grille, ensuring the cleanliness of the open deck. The bottom of the box becomes an area where oil accumulates, effectively preventing this part of the oil from being discharged with the air flow.

[0022] (3) Through the two-stage separation effect of the upper and lower oil baffles, the gas discharged through the ventilation grille is mostly water vapor with extremely low oil and gas content. This significantly reduces the oil content in the exhaust gas, reduces the oil condensed and attached to the ventilation grille, and reduces the oil stains dripping onto the open deck surface, thereby effectively ensuring the cleanliness of the open deck and improving the working environment and safety of the ship.

[0023] (4) As the oil stains on the ventilation grilles and deck surfaces are significantly reduced, the cleaning and maintenance requirements for the exterior of the oil mist box will also be reduced accordingly. This reduces the frequency and workload of manual cleaning, reduces the maintenance cost of the ship, extends the cleaning cycle of the equipment, and improves the operating efficiency of the equipment.

[0024] (5) The upper and lower oil baffles are directly connected to the top and bottom of the box body, which has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of an embodiment of the present invention;

[0026] Figure 2 is a side view of an embodiment of the present invention.

[0027] In the figure, 1. box body; 2. ventilation elbow; 3. ventilation grille; 4. upper oil baffle plate; 5. lower oil baffle plate; 6. oil baffle plate fixing ring. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0031] like Figures 1-2 As shown, a marine oil mist box according to a preferred embodiment of the present invention comprises a box body 1, a ventilating elbow 2, a ventilation grille 3, an upper oil baffle 4 and a lower oil baffle 5;

[0032] The box body 1 is used to be fixedly connected to the main hull and is set on the open deck. A accommodating space is provided in the box body 1. The vent elbow 2 is hollow. One end of the vent elbow 2 is provided in the accommodating space for introducing oil and gas into the accommodating space. An exhaust port is provided at one end of the vent elbow 2 provided in the accommodating space. An air outlet is opened on one side wall of the box body 1. A ventilation grille 3 is provided at the air outlet and is connected to the box body 1 for discharging gas.

[0033] The upper oil baffle plate 4 and the lower oil baffle plate 5 are accommodated in the accommodating space, the upper oil baffle plate 4 is connected to the top of the box body 1, and the lower oil baffle plate 5 is connected to the bottom of the box body 1;

[0034] A first gap is provided between the upper oil baffle plate 4 and the bottom of the box body 1, a second gap is provided between the upper oil baffle plate 4 and the lower oil baffle plate 5, and a third gap is provided between the lower oil baffle plate 5 and the top of the box body 1;

[0035] The exhaust port, the first gap, the second gap, the third gap and the air outlet are connected in sequence.

[0036] The operating process of the present invention is as follows: the oil and gas exhausted from the generator set crankcase enters the interior of the marine oil mist box 1 through the vent elbow 2. Upon entering the box 1, the oil and gas first flow upward, encountering an upper oil baffle 4 positioned near the ventilation grille 3. After passing through the upper baffle 4, any remaining oil and gas that has not been completely separated continues along the path, encountering a lower oil baffle 5 positioned at the bottom of the box 1. After two stages of separation by the upper and lower oil baffles 4, the gas that is ultimately discharged to the outside environment through the ventilation grille 3 has a significantly reduced oil and gas content. This gas is primarily composed of water vapor and other non-oil gases.

[0037] Based on the above technical solution, after being discharged, the oil and gas first encounter the cooler upper oil baffle 4. The discharged oil and gas temperature is approximately 70°C to 95°C. The ambient temperature of the upper oil baffle 4 is approximately 40°C, resulting in a temperature difference of 30°C to 55°C. Since the oil content in the oil and gas is much higher than that of water, the temperature difference causes some of the oil and gas to condense into liquid oil and adhere to the surface of the upper oil baffle 4. This initial interception and separation of some of the oil, reducing the oil content in the subsequent flow of oil and gas, thereby reducing the amount of condensable oil in the gas ultimately discharged into the ventilation grille 3 and directly reducing the accumulation of oil contaminants on the outer surface of the ventilation grille 3. The remaining oil and gas not fully separated by the upper oil baffle 4 continues to flow. When it encounters the lower oil baffle 5, due to the loss of kinetic energy and the subsequent temperature difference, some of the oil and gas will condense again. At the same time, the gas with reduced kinetic energy tends to sink to the bottom of the tank under the action of gravity, where the low temperature environment further promotes condensation of the oil and gas. The lower oil baffle 5 acts as a secondary interceptor and promotes settling, further reducing the concentration of oil vapor ultimately discharged through the ventilation grille 3. The gas passing through the ventilation grille 3 is primarily water vapor, reducing the amount of oil condensing and adhering to the grille, thus ensuring a clean and tidy weather deck. The bottom of the tank 1 becomes an area where oil accumulates, effectively preventing this oil from being discharged with the airflow. Thanks to the two-stage separation action of the upper and lower oil baffles 5, the gas ultimately discharged through the ventilation grille 3 is primarily water vapor, with an extremely low oil vapor content. This significantly reduces the oil content in the exhaust gas, effectively reducing the amount of oil condensing and adhering to the ventilation grille 3, as well as oil stains dripping onto the weather deck surface. This effectively ensures a clean and tidy weather deck, improving the vessel's working environment and safety. With significantly less oil contamination on the ventilation grille 3 and the deck surface, the need for cleaning and maintenance on the exterior of the oil mist box is also reduced. This reduces the frequency and workload of manual cleaning, lowers vessel maintenance costs, extends the equipment's cleaning cycle, and improves its operating efficiency. The upper and lower oil baffles 5 are directly fixed to the top and bottom of the tank 1, resulting in a simple structure. The simple fixed connection method reduces manufacturing difficulty and cost, while also reducing potential failure points and improving equipment reliability.

[0038] Furthermore, there are multiple air bends 2, and the multiple air bends 2 are spaced apart along the extension direction of the box body 1. The multiple air bends 2 spaced apart can more evenly introduce the oil and gas from the crankcase air box of the generator set into the internal space of the oil mist box. A single inlet may form a strong local airflow inside the box body 1, affecting the sedimentation of the oil and gas and the contact efficiency with the oil baffle. Multiple inlets can disperse the airflow, reduce local impact, and allow the oil and gas to diffuse more smoothly into the box body 1. The more uniform distribution of oil and gas allows each area inside the box body 1 to function effectively, increases the chances of oil and gas contacting the oil baffle and the inner wall of the box body 1, and thus improves the overall oil and gas separation and condensation efficiency. If one of the air bends 2 is slightly blocked or fails, the other air bends 2 can still continue to introduce oil and gas to ensure basic operation.

[0039] Furthermore, both the upper and lower oil baffles 4 and 5 extend vertically. These vertically positioned oil baffles primarily separate oil and gas by physically blocking and redirecting the horizontal flow of air. After entering through the vent elbow 2, oil and gas must bypass the vertical oil baffles before reaching the ventilation grille 3. Due to inertia, oil mist particles in the oil and gas are more likely to strike and adhere to the vertical oil baffles when the airflow changes direction.

[0040] Furthermore, the height of the accommodating space in the vertical direction is defined as H, and the height of the upper oil baffle 4 in the vertical direction is defined as H1, satisfying the following relationship: The upper oil baffle 4 occupies a larger vertical height ratio of the accommodation space, so that the upward flowing oil and gas have a larger surface area and longer contact time with the upper oil baffle 4 during the discharge process. This will significantly enhance the oil and gas separation ability of the upper oil baffle 4, and through temperature difference condensation and inertial collision, it can capture more oil mist particles and improve the primary separation efficiency. In the most preferred embodiment, The oil-gas separation efficiency of the upper oil baffle 4 is maximized, and more oil mist particles are captured by increasing the contact area and interception time.

[0041] Furthermore, the height of the lower oil baffle 5 in the vertical direction is defined as H2, which satisfies the following relationship: The upper and lower oil baffles 5 form a certain coverage range in the vertical direction. Both upward and downward flowing oil and gas need to pass through the obstruction of these two oil baffles, which increases the probability of oil and gas being intercepted and separated. This synergistic effect can more effectively reduce the oil and gas content discharged through the ventilation grille 3, and further improve the overall oil and gas separation efficiency. The lower oil baffle 5 of appropriate height can block the airflow in the lower area, slow down the flow rate, and create a more favorable environment for oil mist particles to settle to the bottom of the box 1 under the action of gravity. Combined with the interception of the upper oil baffle 4, the amount and kinetic energy of oil and gas reaching the lower space have been reduced. The setting of the lower oil baffle 5 can more effectively promote the sedimentation of the remaining oil mist and the retention of condensed oil at the bottom. In the most preferred embodiment, Combined with the height range of the upper oil baffle plate 4, it is intended to more effectively intercept and separate oil and gas through the coordinated action of the upper and lower oil baffle plates 5.

[0042] Furthermore, the marine oil mist box includes at least two oil baffle retaining rings 6, which are fixedly connected to the box body 1 and positioned within the accommodating space. The upper and lower oil baffles 4 and 5 are removably connected to the oil baffle retaining rings 6 via bolt fasteners. Compared to directly securing the oil baffles to the inner wall of the box body 1, using the oil baffle retaining rings 6 as intermediate connectors provides a more stable and reliable fixation method. The retaining rings can be designed to provide greater structural strength and a better connection interface, ensuring that the oil baffles are less likely to loosen or deform under operating conditions such as oil and gas impact and ship vibration. This ensures the position and angle of the oil baffles during operation, maintaining their desired oil-gas separation effect and improving the overall reliability and service life of the equipment. The removable bolt fasteners attaching the oil baffles to the oil baffle retaining rings 6 facilitate easy maintenance, cleaning, or replacement. The oil baffles can be removed by simply loosening the bolts, without disrupting the box body 1 or performing complex disassembly. Maintenance time and effort are significantly reduced, while efficiency is improved. Condensed oil on the oil baffle can be removed regularly for thorough cleaning, ensuring efficient separation and preventing oil accumulation that could impact equipment performance. If the oil baffle becomes damaged due to long-term use or requires replacement with a new design, components can be easily replaced, extending the oil mist box's service life and potential for upgrades.

[0043] Furthermore, the oil baffle plate has multiple retaining rings 6, which are spaced apart on opposite sides of the accommodating space. Placing multiple, spaced-apart retaining rings 6 on either side of the oil baffle plate provides multiple support points along its edge. Compared to installing only one or a few retaining rings 6 on either side, these multiple, spaced-apart retaining rings more evenly distribute the oil flow impact and vibration loads on the oil baffle plate, providing more comprehensive support. This reduces the risk of localized overstress on the oil baffle plate, improves the stability and reliability of the fixation, prevents unnecessary deformation or movement of the oil baffle plate, and ensures that it maintains its designed position and angle, thereby ensuring stable oil-gas separation. Multiple fixing points effectively constrain the edge of the oil baffle plate, improving its resistance to bending and torsional deformation. Especially for larger oil baffle plates, multiple retaining rings significantly enhance their overall rigidity, making them less susceptible to deformation under the impact of high-speed oil flow, thereby ensuring effective oil-gas flow guidance and separation efficiency.

[0044] Furthermore, the thickness of the upper oil baffle 4 and the lower oil baffle 5 are both 4mm to 8mm. In the most preferred embodiment, the thickness of the upper oil baffle 4 and the lower oil baffle 5 are both 5mm. Under the impact of oil and gas flow and vibration during ship operation, the upper oil baffle 4 and the lower oil baffle 5 need to have a certain structural strength and rigidity to prevent deformation or damage. The thickness range of 4mm to 8mm can provide sufficient support for the upper oil baffle 4 and the lower oil baffle 5, ensuring that they maintain a stable shape and position during long-term use, maintaining their oil and gas separation effect. This prevents oil and gas leakage or a decrease in separation efficiency due to deformation.

[0045] Furthermore, the wall thickness of the box body 1 is 5mm to 9mm. In the most preferred embodiment, the wall thickness of the box body 1 is 6mm. The box body 1 needs to withstand internal oil and gas pressure, external environmental loads and the weight of the equipment itself. Sufficient wall thickness is the basis for ensuring the structural safety and stable operation of the box body 1. The wall thickness range of 5mm to 9mm can ensure that the box body 1 has sufficient strength and rigidity to prevent deformation, cracking or damage during use, ensure the sealing of the oil mist box and the integrity of the overall structure, thereby ensuring its normal operation and service life. The most preferred wall thickness of 6mm may be based on meeting the strength requirements while taking into account the material cost and weight.

[0046] In summary, the present invention provides a marine oil mist box in which, after exhausting, the oil and gas first encounter the cooler upper oil baffle 4. The temperature of the discharged oil and gas is approximately 70°C to 95°C, while the ambient temperature of the upper oil baffle 4 is approximately 40°C, resulting in a temperature difference of 30°C to 55°C. Because the oil content in the oil and gas is much higher than that of water, the temperature difference causes some of the oil and gas to condense into liquid oil and adhere to the surface of the upper oil baffle 4. This initial interception and separation of some of the oil fraction reduces the oil content in the subsequent flow of oil and gas, thereby reducing the amount of condensable oil in the gas ultimately discharged to the ventilation grille 3 and directly reducing the accumulation of oil contaminants on the outer surface of the ventilation grille 3. The remaining oil and gas not completely separated by the upper oil baffle 4 continues to flow. When it encounters the lower oil baffle 5, some of the oil and gas condenses again due to the loss of kinetic energy and the subsequent temperature difference. Simultaneously, the gas, with reduced kinetic energy, tends to sink to the bottom of the box under the action of gravity, where the low temperature environment further promotes condensation of the oil and gas. The lower oil baffle 5 acts as a secondary interceptor and promotes settling, further reducing the concentration of oil vapor ultimately discharged through the ventilation grille 3. The gas passing through the ventilation grille 3 is primarily water vapor, reducing the amount of oil condensing and adhering to the grille, thus ensuring a clean and tidy weather deck. The bottom of the tank 1 becomes an area where oil accumulates, effectively preventing this oil from being discharged with the airflow. Thanks to the two-stage separation action of the upper and lower oil baffles 5, the gas ultimately discharged through the ventilation grille 3 is primarily water vapor, with an extremely low oil vapor content. This significantly reduces the oil content in the exhaust gas, effectively reducing the amount of oil condensing and adhering to the ventilation grille 3, as well as oil stains dripping onto the weather deck surface. This effectively ensures a clean and tidy weather deck, improving the vessel's working environment and safety. With significantly less oil contamination on the ventilation grille 3 and the deck surface, the need for cleaning and maintenance on the exterior of the oil mist box is also reduced. This reduces the frequency and workload of manual cleaning, lowers vessel maintenance costs, extends the equipment's cleaning cycle, and improves its operating efficiency. The upper and lower oil baffles 5 are directly fixed to the top and bottom of the tank 1, resulting in a simple structure. The simple fixed connection method reduces manufacturing difficulty and cost, while also reducing potential failure points and improving equipment reliability.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A marine oil mist box, characterized in that: It comprises a box body (1), a ventilating elbow (2), a ventilation grille (3), an upper oil baffle (4) and a lower oil baffle (5); The box (1) is used for being fixedly connected to the main hull and arranged on the open deck surface; a accommodating space is provided in the box (1); the ventilating elbow (2) is hollow; one end of the ventilating elbow (2) is arranged in the accommodating space for introducing oil and gas into the accommodating space; one end of the ventilating elbow (2) arranged in the accommodating space is provided with an exhaust port; a side wall of the box is provided with an air outlet; the ventilation grille (3) is arranged at the air outlet and is connected to the box (1); The upper oil baffle plate (4) and the lower oil baffle plate (5) are accommodated in the accommodating space, the upper oil baffle plate (4) is connected to the top of the box body (1), and the lower oil baffle plate (5) is connected to the bottom of the box body (1); A first gap is provided between the upper oil baffle plate (4) and the bottom of the box body (1), a second gap is provided between the upper oil baffle plate (4) and the lower oil baffle plate (5), and a third gap is provided between the lower oil baffle plate (5) and the top of the box body (1); Wherein, the exhaust port, the first gap, the second gap, the third gap and the air outlet are connected in sequence.

2. The marine oil mist box according to claim 1, characterized in that: There are a plurality of the ventilating bent pipes (2), and the plurality of the ventilating bent pipes (2) are arranged at intervals along the extending direction of the box body (1).

3. The marine oil mist box according to claim 1, characterized in that: The upper oil baffle plate (4) and the lower oil baffle plate (5) both extend in a vertical direction.

4. The marine oil mist box according to claim 1, characterized in that: The height of the accommodating space in the vertical direction is defined as H, and the height of the upper oil baffle (4) in the vertical direction is defined as H1, satisfying the following relationship:

5. The marine oil mist box according to claim 4, characterized in that: The height of the lower oil baffle (5) in the vertical direction is defined as H2, which satisfies the following relationship:

6. The marine oil mist box according to claim 1, characterized in that: It also includes an oil baffle fixing ring (6), the number of the oil baffle fixing ring (6) is at least two, the oil baffle fixing ring (6) is fixedly connected to the box body (1) and is located in the accommodating space, and the upper oil baffle (4) and the lower oil baffle (5) are respectively detachably connected to the oil baffle fixing ring (6) by bolt fasteners.

7. The marine oil mist box according to claim 6, characterized in that: The number of the oil baffle fixing rings (6) is multiple, and the multiple oil baffle fixing rings (6) are arranged on two opposite sides of the accommodating space and are spaced apart.

8. The marine oil mist box according to claim 1, characterized in that: The thickness of the upper oil baffle plate (4) and the lower oil baffle plate (5) are both 4 mm to 8 mm.

9. The marine oil mist box according to claim 1, characterized in that: The wall thickness of the box body (1) is 5 mm to 9 mm.

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