Water cannon preventing air inlet system of ship propulsion diesel engine and using method of water cannon preventing air inlet system

Abstract

The ship propulsion diesel engine waterproof cannon air inlet system comprises an air inlet chamber, a waterproof cannon shutter is embedded in the outer end face of the air inlet chamber, an air inlet filtering device is arranged on the inner end face of the air inlet chamber, and the air inlet chamber is connected with an air inlet pipeline through the air inlet filtering device. According to the water cannon water inlet filtering device, water cannon water is prevented from entering the air inlet pipeline, the quality of inlet air is guaranteed, normal operation of a propulsion diesel engine is guaranteed, and the vitality of ship navigation is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship power auxiliary system design, and in particular relates to a ship propulsion diesel engine waterproof cannon air intake system and a use method thereof. Background Art

[0002] When law enforcement ships are performing their duties, water cannon attacks are the main means of law enforcement. The flow rate and impact of water cannon attacks are very large, while the traditional propulsion diesel engine intake system is only equipped with traditional shutters and air intake devices, which are mainly installed on the superstructure of the ship and exposed to the external environment. It can separate a small amount of rainwater and only has the ability to resist rainwater, and cannot resist the attack of such a large water cannon. Therefore, when an external water cannon attacks, under the influence of the negative pressure of the intake and the intake airflow, a large amount of water from the water cannon is sucked into the intake pipe from the shutters, and then enters the interior of the propulsion diesel engine, causing the diesel engine to stop or even be damaged, affecting the normal navigation of the ship.

[0003] In order to prevent the water from the high-pressure water cannon from entering the diesel engine through the air intake pipe, water cannon protection measures must be considered when designing the air intake system of law enforcement ships to prevent water cannon attacks and avoid damage to the propulsion diesel engine. In addition, the propulsion diesel engine is the core equipment for the normal navigation of the ship, which is directly related to the safety and vitality of the ship's navigation. The design of the water cannon for the air intake pipe should have at least two protection measures to ensure the normal operation of the propulsion diesel engine in the event of a malfunction or damage to the shutter. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ship propulsion diesel engine water cannon air intake system and a method of use for the above-mentioned problems, which can block high-pressure and high-flow water cannon water from entering the air intake pipeline when the enemy water cannon attacks, while ensuring that the air intake quality and resistance loss of the propulsion diesel engine meet the diesel engine operation requirements, thereby ensuring the normal operation of the propulsion diesel engine.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a ship propulsion diesel engine waterproof cannon air intake system, characterized in that it includes an air intake chamber, a waterproof cannon shutter is embedded on the outer end surface of the air intake chamber, and an air intake filter device is provided on the inner end surface of the air intake chamber, which is connected to the air intake pipeline through the air intake filter device, and the air intake path is sequentially the waterproof cannon shutter, the air intake chamber, the air intake filter device and the air intake pipeline.

[0006] According to the above scheme, there is a certain height difference between the installation height of the waterproof cannon shutter and the installation height of the air intake filter device.

[0007] According to the above solution, a drainage hole is provided on the bottom plate of the air inlet chamber.

[0008] According to the above scheme, the air intake filter device is provided with a filter module to remove water droplets, dust and salt mist.

[0009] According to the above scheme, the waterproof cannon shutter includes a square outer frame, and cyclone-level blades and inertia-level blades vertically arranged in the outer frame along the air inlet direction.

[0010] According to the above solution, the height difference is greater than or equal to 300 mm.

[0011] According to the above scheme, the number of the drainage holes is 4-8 and the diameter of the drainage holes is 70-90 mm.

[0012] A method for using a waterproof cannon air intake system for a ship propulsion diesel engine, characterized in that it includes the following contents:

[0013] When an external water cannon attacks, it first impacts the waterproof cannon louver, which blocks the water from the water cannon. When the waterproof cannon louver is damaged or malfunctions, the water from the water cannon enters the air intake chamber. On the one hand, it is drained from the bottom drainage hole. On the other hand, due to a certain height difference between the air intake filter device and the waterproof cannon louver, some water is discharged from the bottom of the waterproof cannon louver, preventing water from entering the air intake pipe. At the same time, the air intake filter device filters out moisture and impurities in the air to ensure the quality of air entering the air intake pipe.

[0014] The beneficial effects of the present invention are as follows: 1. It provides a ship propulsion diesel engine waterproof cannon air intake system and a method of use, wherein the waterproof cannon shutter withstands the impact force of the water cannon, and there are no obvious water drops on the back side under the water cannon attack state;

[0015] 2. In the case of failure or damage of the waterproof cannon shutter, the water from the water cannon enters the air intake chamber and can be discharged through the height difference between the waterproof cannon shutter and the air intake filter device and the drain pipe at the bottom of the air intake chamber;

[0016] 3. Install an air intake filter device. The intake air passes through the air intake filter device to ensure the intake quality of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of an air intake system for a waterproof cannon according to an embodiment of the present invention;

[0019] Figure 2A top view of an air intake system for a waterproof cannon according to an embodiment of the present invention;

[0020] Figure 3 A three-dimensional model diagram of the resistance loss calculation of the air intake system of a waterproof cannon according to an embodiment of the present invention;

[0021] Figure 4 This is a diagram showing the calculation results of the resistance loss of the air intake system of a waterproof cannon according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0030] like Figure 1 , Figure 2 As shown, a ship propulsion diesel engine waterproof cannon air intake system in an embodiment of the present invention includes an air intake chamber 1, a waterproof cannon louver 2 is embedded on the outer end surface of the air intake chamber, an air intake filter device 3 is provided on the inner end surface of the air intake chamber, and is connected to the air intake pipeline 4 through the air intake filter device. The air intake path is sequentially the waterproof cannon louver, the air intake chamber, the air intake filter device and the air intake pipeline.

[0031] There is a certain height difference between the installation height of the waterproof shutter and the installation height of the air intake filter device, which is greater than or equal to 300mm. There are 4-8 drainage holes on the bottom plate of the air intake chamber, and the hole diameter of the drainage holes is 70-90mm. The water in the air intake chamber can be discharged through the hollow part at the bottom of the waterproof shutter and the drainage holes.

[0032] The air intake filter is equipped with a filter module to remove water droplets, dust and salt spray. After the air intake passes through the filter, 100% of the water droplets with a diameter greater than 13um and 98% of the water droplets with a diameter greater than 5um are separated. The dust after filtration is less than 0.5mg / Nm 3 , the salt spray concentration is less than 1mg / m 3 .

[0033] The waterproof shutter includes a square outer frame, and cyclone blades and inertia blades arranged vertically in the outer frame along the air inlet direction. When the airflow containing a large amount of liquid water enters the waterproof shutter, it first encounters the obstruction of the cyclone blades. At this time, the airflow will rotate, and water droplets of different diameters will gradually flow along the blade wall under the action of centrifugal force, while the core flow air particles and impurities are separated; the airflow continues to flow in and encounters the obstruction of the inertia blade. When the airflow flows through the tortuous flow channel, the centrifugal force generated by the turning effect deviates from the streamline, causing it to collide with the blade wall, where the water is captured by the blade wall to form a water film and flows to the bottom of the blade under the action of gravity, and is discharged after being collected.

[0034] First, the waterproof cannon shutters can completely block high-pressure and high-flow cannon water from entering the air intake pipe. At the same time, in the event of a failure or damage to the waterproof cannon shutters, the air intake chamber can be isolated by setting up an air intake chamber. The water entering the air intake chamber can be discharged out of the air intake chamber through the height difference between the waterproof cannon shutters and the air intake filter device, and can also be discharged through the bottom drain pipe, which can further ensure the normal operation of the propulsion diesel engine. Finally, the air entering the air intake pipe is filtered by the air intake filter device to ensure the air intake quality of the propulsion diesel engine.

[0035] Example 1

[0036] In this embodiment, the size of the air intake chamber is: 3200mm×1200mm×2300mm, a waterproof shutter is installed on the rear wall of the air intake chamber, an air intake filter device is installed on the front wall of the air intake chamber, and there are 6 drainage holes with an aperture of Φ80mm on the deck of the air intake chamber. The airflow direction is waterproof shutter-air intake chamber-air intake filter device-air intake pipeline, and then enters the propulsion diesel engine through the air intake pipeline, so as to provide power for the diesel engine cylinder to burn and then propel the ship to sail.

[0037] If an external water cannon attack wants to enter the air intake pipe, it needs to pass through the waterproof cannon shutter. First of all, the waterproof cannon shutter can withstand the impact force of 50m away with a water cannon outlet pressure of not less than 1.2MPa, a muzzle diameter of not less than 100mm, and no obvious water droplets on the back under the water cannon attack state, which can basically prevent the water cannon water from entering the air intake pipe. If the waterproof cannon shutter fails or is damaged, the water cannon water will enter the air intake chamber. At this time, there are two countermeasures. First, there is a certain height difference between the installation height of the waterproof cannon shutter and the installation height of the air intake filter device. When the water level is higher than the bottom of the waterproof cannon shutter and lower than the bottom of the air intake filter device, the water will flow out from the hollow structure at the bottom of the waterproof cannon shutter. Second, there are 6 water flow holes with a diameter of Φ80mm at the bottom of the air intake chamber to discharge water, which ensures that water cannot enter the air intake pipe from two aspects.

[0038] When normal air passes through the air intake filter, the air intake filter will filter out moisture and impurities in the air, thereby ensuring the quality of air entering the intake pipe.

[0039] At the same time, in order to ensure that the resistance loss of the intake system meets the resistance loss requirements of the diesel engine, the diesel engine intake system was simulated and calculated. Because the operating requirements of a certain type of diesel engine are not greater than 2500Pa, only the requirements for the entire intake system (including intake pipe, muffler, intake chamber, waterproof shutter, intake filter device) are put forward, so a simulation model of the entire intake system is established (such as Figure 3 ), the calculation results show that the resistance loss is about 1900Pa (such as Figure 4 ), meet the requirements for normal operation of a certain type of diesel engine.

[0040] The above measures can prevent cannon water from entering the air intake pipe, ensure the quality of intake air, guarantee the normal operation of the diesel engine, and enhance the vitality of ship navigation.

[0041] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ship propulsion diesel engine waterproof cannon air intake system, characterized in that: It includes an air intake chamber, an outer end surface of which is embedded with a waterproof cannon shutter, an inner end surface of which is provided with an air intake filter device, which is connected to an air intake pipeline through the air intake filter device, and the air intake path is sequentially the waterproof cannon shutter, the air intake chamber, the air intake filter device and the air intake pipeline.

2. A ship propulsion diesel engine waterproof cannon air intake system according to claim 1, characterized in that: There is a certain height difference between the installation height of the waterproof cannon shutter and the installation height of the air intake filter device.

3. A ship propulsion diesel engine waterproof cannon air intake system according to claim 2, characterized in that: The bottom plate of the air inlet chamber is provided with a drainage hole.

4. A ship propulsion diesel engine waterproof cannon air intake system according to claim 1 or 3, characterized in that: The air intake filter device is provided with a filter module to remove water droplets, dust and salt mist.

5. A ship propulsion diesel engine waterproof cannon air intake system according to claim 4, characterized in that: The waterproof cannon shutter comprises a square outer frame, and cyclone-level blades and inertia-level blades vertically arranged in the outer frame along the air inlet direction.

6. A ship propulsion diesel engine waterproof cannon air intake system according to claim 2 or 5, characterized in that: The height difference is greater than or equal to 300 mm.

7. A ship propulsion diesel engine waterproof cannon air intake system according to claim 3, characterized in that: The number of the drainage holes is 4-8 and the diameter of the drainage holes is 70-90 mm.

8. A method for using the marine diesel engine waterproof cannon air intake system according to claim 3, characterized in that: It includes the following: When an external water cannon attacks, it first impacts the waterproof cannon louver, which blocks the water from the water cannon. When the waterproof cannon louver is damaged or malfunctions, the water from the water cannon enters the air intake chamber. On the one hand, it is drained from the bottom drainage hole. On the other hand, due to a certain height difference between the air intake filter device and the waterproof cannon louver, some water is discharged from the bottom of the waterproof cannon louver, preventing water from entering the air intake pipe. At the same time, the air intake filter device filters out moisture and impurities in the air to ensure the quality of air entering the air intake pipe.

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