Marine diesel engine cooling system

Abstract

A marine diesel engine cooling system relates to the technical field of diesel engine cooling equipment, and comprises a filtering device and a cooling device, the cooling device comprises a freezing box, a pre-cooling box and a mixing box; the freezing box is communicated with a water outlet of the filtering device, the freezing box is used for freezing part of the filtered seawater and making the seawater into ice crumbs, and an ice crumb discharging opening of the freezing box is communicated with the mixing box; the pre-cooling box is communicated with a water outlet of the filtering device, the pre-cooling box is used for cooling the filtered residual seawater, and a water outlet of the pre-cooling box is communicated with the mixing box; a water outlet of the mixing box is communicated with the diesel engine cooling box, and a water outlet of the diesel engine cooling box is communicated with the filtering device. According to the system, ice chips and pre-cooled seawater can be mixed to form a low-temperature cooling medium, seawater evaporation and scaling are thoroughly avoided by adopting closed circulation, meanwhile, the self-cleaning filter is integrated to automatically remove impurities, and the cooling efficiency and the system reliability are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel engine cooling equipment, in particular to a marine diesel engine cooling system. BACKGROUND

[0002] The marine diesel engine is known as the "heart" of the ship, and its running stability and efficiency directly determine the power performance and reliability of the whole ship, and a high-efficiency cooling system is the key guarantee for maintaining its good working condition. At present, the closed cycle central cooling system is widely used in the field of ships as the mainstream technical scheme. The core of the system is the division of labor of the two independent circulation loops: the internal loop uses clean freshwater to circulate and cool the diesel engine body and its auxiliary equipment, such as air coolers, oil coolers, and cylinder sleeve water coolers; the external loop introduces seawater, and through plate or shell-and-tube heat exchangers, the freshwater in the internal loop is cooled to realize heat exchange.

[0003] Although compared with the early open seawater direct cooling system, the closed cycle design has significantly improved the anti-corrosion and anti-fouling performance, effectively protecting the core components of the diesel engine, but its seawater circuit still faces two major technical problems: first, the blockage problem caused by seawater impurities. Seawater contains a large amount of suspended solids, microorganisms and their larvae and other impurities, which are easy to accumulate in the seawater filter and heat exchanger flow channel, causing a decrease in passability, and the system needs to be frequently stopped for manual cleaning or replacement of the filter element. This process not only has a complicated operation and high maintenance cost, but also reduces the continuity and economy of the ship operation. Secondly, the more stubborn seawater fouling problem. Although indirect heat exchange is used, seawater will still be heated when flowing through the heat exchanger, causing the dissolved calcium, magnesium and other salts in the water to precipitate and firmly adhere to the heat exchange surface, forming hard scale with poor thermal conductivity. The scale not only greatly reduces the heat transfer efficiency, causing the diesel engine to be insufficiently cooled or even overheated, but also reduces the flow cross-section and increases the water flow resistance, further affecting the system performance. The current countermeasures mainly include adding chemical agents to prevent fouling and regularly stopping for mechanical or acid cleaning, but these methods are either difficult to continue due to the cost of chemicals and environmental problems, or are passive due to the high operation intensity and impact on operation, and none of them can fundamentally block the occurrence of fouling. SUMMARY

[0004] Therefore, the present application aims to provide a marine diesel engine cooling system that can mix ice chips with pre-cooled seawater to form a low-temperature cooling medium, use closed circulation to completely avoid seawater evaporation and fouling, and integrate a self-cleaning filter to automatically remove impurities, thereby significantly improving cooling efficiency and system reliability.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows:

[0006] A marine diesel engine cooling system comprises:

[0007] a filtering device, a water inlet of the filtering device being in communication with seawater outside;

[0008] a cooling device, the cooling device comprising a freezing tank, a pre-cooling tank and a mixing tank; the freezing tank being in communication with a water outlet of the filtering device, the freezing tank being used for freezing and making ice chips from part of the filtered seawater, an ice chip outlet of the freezing tank being in communication with the mixing tank; the pre-cooling tank being in communication with the water outlet of the filtering device, the pre-cooling tank being used for cooling the remaining filtered seawater, a water outlet of the pre-cooling tank being in communication with the mixing tank; a water outlet of the mixing tank being in communication with a diesel engine cooling tank, a water outlet of the diesel engine cooling tank being in communication with the filtering device.

[0009] Preferably, the filtering device comprises a filtering tank, a water inlet of the filtering tank being in communication with seawater outside through a connecting pipe one;

[0010] the filtering tank comprises a filtering tank body, a filter screen being fixedly arranged inside the filtering tank body, one side of the filter screen being arranged in a downward inclination, a blocking block being arranged below the filter screen, the blocking block being vertically reciprocally slidable, a top surface of the blocking block being arranged in an inclination and having the same inclination direction and inclination angle as the filter screen, a drain pipe being installed on the filtering tank body and being in communication with the outside;

[0011] a bottom of the blocking block being connected with a driving end of a blocking power element through a top rod.

[0012] Preferably, the water outlet of the diesel engine cooling tank is in communication with the filtering tank body and is located above the filter screen, the drain pipe being arranged close to the most bottom end of the inclination of the filter screen;

[0013] a seawater filter being installed on the connecting pipe one.

[0014] Preferably, the freezing tank comprises a freezing tank body, a water injection mechanism, an ice making mechanism and an ice crushing mechanism being arranged inside the freezing tank body;

[0015] the water injection mechanism comprises a U-shaped water injection frame, the U-shaped water injection frame being horizontally reciprocally movable, the U-shaped water injection frame being horizontally arranged and having an opening facing the ice making mechanism, a water injection channel being formed on the U-shaped water injection frame, the water injection channel being in communication with an inner cavity of the U-shaped water injection frame and one end of a connecting pipe two, the other end of the connecting pipe two being in communication with the water outlet of the filtering device;

[0016] The ice making mechanism comprises an ice making tube vertically fixed, the ice making tube is open at both ends, an annular liquid nitrogen tank is fixed on the outer wall of the ice making tube, and the liquid nitrogen tank is communicated with the liquid nitrogen supplement device outside; when water is injected, the U-shaped water injection frame covers both ends of the ice making tube, and the water injection channel communicates the connecting pipe two with the inner cavity of the ice making tube; after ice making, the U-shaped water injection frame translates and completely exposes the ice making tube; a pushing mechanism is arranged above the ice making tube, and the pushing mechanism is used for pushing the ice in the ice making tube out;

[0017] The ice crushing mechanism is arranged below the ice making tube, the ice crushing mechanism comprises two oppositely arranged crushing plates, the two crushing plates can approach or move away from each other, an ice crushing area for crushing ice is formed between the two crushing plates, and a conveying auger is installed below the two crushing plates, and the conveying auger is used for pushing the crushed ice to the mixing box.

[0018] Preferably, the U-shaped water injection frame comprises a top plate, a bottom plate and a side plate connected between the two, the water injection channel is arranged on the top plate, and a transition hose is connected between the water injection channel and the connecting pipe two;

[0019] A translation motor is installed on the side plate, an output shaft of the translation motor is connected with a horizontal lead screw penetrating through the side plate, the lead screw is matched with a nut installed on a translation bracket, and the translation bracket is fixedly installed in the interior of the freezing box body;

[0020] A horizontally arranged guide rod is installed on the side plate, and the guide rod penetrates through the translation bracket.

[0021] Preferably, the pushing mechanism comprises an electric telescopic rod fixed in the freezing box body, the electric telescopic rod is vertically arranged and the action end thereof is arranged towards the ice making tube, and a push plate is installed at the action end of the electric telescopic rod;

[0022] The push plate is a circular plate and is coaxially arranged with the ice making tube.

[0023] Preferably, the ice crushing mechanism comprises a conveying frame, the conveying frame has a U-shaped structure with an opening upward, and the two crushing plates are respectively installed on the two side walls of the conveying frame;

[0024] A crushing hydraulic cylinder corresponding to the crushing plate is installed on the side wall of the conveying frame, the action end of the crushing hydraulic cylinder is connected with a U-shaped push rod, and the two ends of the U-shaped push rod are connected with the crushing plates;

[0025] The bottom of the conveying frame is provided with the conveying auger, and a screen is arranged between the conveying auger and the two crushing plates, the screen is horizontally arranged between the two side walls of the conveying frame, one end of the conveying auger is arranged outside the conveying frame and is connected with the conveying motor, and the conveying auger pushes the crushed ice chips to the mixing box.

[0026] Preferably, the top of the crushing plate is provided with an inclined outward guide part, and a plurality of anti-skid protrusions are arranged on the inner wall of the crushing plate.

[0027] The conveying frame is communicated with the mixing box through an inclined chute, the chute is a closed chute, the top end of the chute is arranged close to the other end of the conveying auger, the conveying auger pushes the crushed ice chips to the chute, and the ice chips in the chute are slid to the mixing box.

[0028] Preferably, the pre-cooling box comprises a pre-cooling box body, the pre-cooling box body is communicated with the freezing box, and the gas temperature in the freezing box is lower than the gas temperature in the pre-cooling box body.

[0029] The inside of the pre-cooling box body is fixedly provided with a partition plate, the partition plate divides the inner cavity of the pre-cooling box body into independent air blowing cavities and pre-cooling cavities, a fan is arranged in the air blowing cavity, and the fan is communicated with the freezing box through a wind cooling pipe.

[0030] Two air guide pipes and a cooling pipe are arranged in the pre-cooling cavity, the two air guide pipes are arranged perpendicularly to the partition plate, one end of the air guide pipe is open and arranged in the air blowing cavity, a plurality of air outlets are arranged on the air guide pipe, and the air outlets on the two air guide pipes are arranged oppositely, the cooling pipe is arranged between the two air guide pipes, the cooling pipe has an S-shaped structure, a water inlet of the cooling pipe is communicated with a water outlet of the filtering device through a connecting pipe three, and a water outlet of the cooling pipe is communicated with the mixing box.

[0031] Preferably, the mixing box comprises a mixing box body, a stirring shaft is rotatably arranged in the mixing box body, one end of the stirring shaft is connected with a stirring motor, and a plurality of stirring blades are arranged on the stirring shaft along the axial direction of the stirring shaft.

[0032] The inner cavity of the mixing box body is communicated with the freezing box, the inner cavity of the mixing box body is communicated with the pre-cooling box through a connecting pipe four, the ice chips produced by the freezing box and the seawater cooled by the pre-cooling box are mixed in the mixing box body, the inner cavity of the mixing box body is communicated with the diesel engine cooling box through a connecting pipe five, and the diesel engine cooling box is communicated with the filtering device through a connecting pipe six.

[0033] After the above technical scheme is adopted, the application has the following beneficial effects:

[0034] Due to the marine diesel engine cooling system of the application, comprising a filtering device and a cooling device, wherein the water inlet of the filtering device is in communication with the seawater outside; the cooling device comprises a freezing tank, a pre-cooling tank and a mixing tank; the freezing tank is in communication with the water outlet of the filtering device, the freezing tank is used for freezing part of the filtered seawater and making ice particles, the ice particle discharge outlet of the freezing tank is in communication with the mixing tank; the pre-cooling tank is in communication with the water outlet of the filtering device, the pre-cooling tank is used for cooling the remaining filtered seawater, the water outlet of the pre-cooling tank is in communication with the mixing tank; the water outlet of the mixing tank is in communication with the diesel engine cooling tank, and the water outlet of the diesel engine cooling tank is in communication with the filtering device. After the seawater is preliminarily purified by the seawater filtering device, it is divided into two paths. One path enters the freezing tank to be made into ice particles; the other path enters the pre-cooling tank to be preliminarily cooled. Thereafter, the ice particles and the pre-cooled seawater are fully mixed in the mixing tank to form a low-temperature ice-water mixture. The mixture is transported to the diesel engine cooling tank to efficiently cool the diesel engine, and after absorbing heat, it is returned to the seawater filtering device to form a complete closed cycle, thereby avoiding seawater evaporation and scaling, and improving the cooling efficiency.

[0035] In the application, by converting seawater into ice particles and mixing with pre-cooled seawater, a low-temperature cooling medium is formed, which circulates in a closed loop, avoiding the evaporation process of seawater, and the dissolved minerals in seawater cannot be concentrated and precipitated, thereby preventing scaling from the root, which eliminates the attachment of scale to the heat exchange surface, ensuring the long-term stable operation of the system. Secondly, the seawater passes through the filtering device to remove suspended impurities before entering the cycle, and in the subsequent ice making stage, the impurities dissolved in the water are separated during the phase change and remain in the ice making unit, which improves the purity of the cooling medium finally participating in the cycle. The system realizes continuous purification of the medium by physical means, reducing the probability of flow passage blockage. Finally, the ice particles absorb the latent heat of phase change when melting in the diesel engine cooling tank, and the cooling capacity per unit mass is higher than that of traditional sensible heat cooling methods. Therefore, the application can achieve the required cooling effect with smaller medium flow or lower operating temperature, reducing the demand for pumping power and providing more stable thermal management conditions for the diesel engine. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be further described below in conjunction with the drawings and examples.

[0037] Figure 1 is a structural schematic diagram of the marine diesel engine cooling system of the embodiment of the application;

[0038] Figure 2 is Figure 1 a structural schematic diagram of the filtering device in the application;

[0039] Figure 3 is Figure 1 a structural schematic diagram of the freezing tank in the application;

[0040] Figure 4 is an enlarged view of A part of Figure 3

[0041] Figure 5 is a structural schematic view of an ice crushing mechanism in Figure 3

[0042] Figure 6 is a structural schematic view of a pre-cooling tank in Figure 1

[0043] Figure 7 is a structural schematic view of a mixing tank in Figure 1

[0044] in the figure:

[0045] 1, filter device; 11, filter tank; 12, connecting pipe one; 13, filter screen; 14, blocking block; 15, drain pipe; 16, top rod; 17, blocking power element; 18, seawater filter;

[0046] 2, cooling device;

[0047] 3, freezing tank; 31, water injection mechanism; 311, U-shaped water injection frame; 3111, top plate; 3112, bottom plate; 3113, side plate; 312, water injection channel; 313, connecting pipe two; 314, transition hose; 315, translation motor; 316, lead screw; 317, translation support; 318, nut; 319, guide rod;

[0048] 32, ice making mechanism; 321, ice making pipe; 322, liquid nitrogen tank;

[0049] 33, ice crushing mechanism; 331, crushing plate; 3311, guide part; 3312, anti-skid protrusion; 332, transfer auger; 333, conveying frame; 334, crushing hydraulic cylinder; 335, U-shaped push rod; 336, screen; 337, transfer motor; 338, chute;

[0050] 34, pushing mechanism; 341, electric telescopic rod; 342, push plate;

[0051] 4, pre-cooling tank; 41, partition plate; 42, fan; 43, air-cooled pipe; 44, air guide pipe; 441, air outlet; 45, cooling pipe; 451, connecting pipe three;

[0052] 5, mixing tank; 51, stirring shaft; 52, stirring motor; 53, stirring blade; 54, connecting pipe four; 55, connecting pipe five;

[0053] 6, diesel engine cooling tank; 61, connecting pipe six. DETAILED DESCRIPTION

[0054] ​​​​In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application.

[0055] As shown in Figure 1 , the present application comprises a filtering device 1 and a cooling device 2. The water inlet of the filtering device 1 is in communication with the seawater outside; the cooling device 2 comprises a freezing tank 3, a pre-cooling tank 4 and a mixing tank 5; the freezing tank 3 is in communication with the water outlet of the filtering device 1, and the freezing tank 3 is used to freeze part of the filtered seawater and make ice chips, and the ice chip outlet of the freezing tank 3 is in communication with the mixing tank 5; the pre-cooling tank 4 is in communication with the water outlet of the filtering device 1, and the pre-cooling tank 4 is used to cool the remaining filtered seawater, and the water outlet of the pre-cooling tank 4 is in communication with the mixing tank 5; the water outlet of the mixing tank 5 is in communication with a diesel engine cooling tank 6, and the water outlet of the diesel engine cooling tank 6 is in communication with the filtering device 1.

[0056] In the present application, the seawater first enters the system through the water inlet of the filtering device 1, and the filtering device 1 performs preliminary purification treatment on the seawater to remove impurities such as suspended particles and aquatic organisms, thereby providing a relatively clean water source for the subsequent cooling process; the filtered seawater is divided into two branches at the water outlet of the filtering device 1, one of which enters the freezing tank 3, and the seawater is frozen into a solid state by the freezing tank 3, and then crushed into fine ice chips, and the other enters the pre-cooling tank 4 to lower the temperature of the seawater and achieve the pre-cooling effect; the prepared ice chips are output from the discharge outlet of the freezing tank 3 and mixed with the low-temperature seawater discharged from the pre-cooling tank 4 in the mixing tank 5, and in the mixing tank 5, the ice chips and the low-temperature seawater are fully mixed to form a uniform ice-water mixture, which has a temperature characteristic significantly lower than that of normal temperature seawater; the low-temperature ice-water mixture produced by the mixing tank 5 is delivered to the diesel engine cooling tank 6 to exchange heat with the original fresh water cooling system, thereby absorbing the heat generated by the diesel engine during operation and cooling the diesel engine; in this process, the ice chips melt and absorb a large amount of latent heat, thereby significantly improving the cooling efficiency; the water medium after heat exchange returns to the filtering device 1 from the water outlet of the diesel engine cooling tank 6 and reenters the treatment cycle. This process forms a complete closed cooling loop, which not only realizes the recycling of the cooling medium, but also avoids the problem of mineral scaling caused by seawater evaporation and concentration, while ensuring the continuous and stable cooling effect.

[0057] As shown in Figure 1 , Figure 2As shown in the drawings, the filtering device 1 comprises a filtering box 11, and a water inlet of the filtering box 11 is communicated with seawater outside through a connecting pipe 12. The filtering box 11 comprises a filtering box body, and a filter screen 13 is fixedly arranged in the filtering box body. One side of the filter screen 13 is arranged in a downward inclination. A blocking block 14 is arranged below the filter screen 13, and the blocking block 14 is vertically reciprocatingly slidably arranged. The top surface of the blocking block 14 is arranged in an inclination and has the same inclination direction and inclination angle as the filter screen 13. A drain pipe 15 is arranged on the filtering box body and communicated with the outside. The bottom of the blocking block 14 is connected with a driving end of a blocking power element 17 through a jacking rod 16.

[0058] Before cooling, seawater is filtered first. The seawater enters the filtering box body through the connecting pipe 12. The water flow passes through the filter screen 13 arranged in an inclination, and the suspended impurities are intercepted by the filter screen 13 and slide down and accumulate along the inclined surface. The filtered clean water enters the other side of the filtering box body through the filter screen 13 and flows to the cooling device 2 through a water outlet. Secondly, after multiple cycles, more suspended impurities are intercepted by the filter screen 13 and accumulated, so that the filter screen 13 needs to be cleaned. When cleaning is needed, the valves of various pipelines are closed first. The blocking power element 17 drives the blocking block 14 to move upward through the jacking rod 16, so that the top surface of the blocking block 14 is tightly combined with the lower surface of the filter screen 13, and the clean water channel is blocked. At this time, the water inlet continuously enters the box body, and the filter screen 13 is flushed, and the intercepted impurities are carried out of the system from the drain pipe 15, and the automatic cleaning is completed. Alternatively, the blocking power element 17 drives the blocking block 14 to move upward through the jacking rod 16, so that the top surface of the blocking block 14 is close to the lower surface of the filter screen 13. Then, the water inlet continuously enters the box body, and the water level rises to form a reverse pressure. The water flow is forced to pass through the filter screen 13 in the reverse direction, and the flushing of the filter screen 13 is also completed.

[0059] Preferably, the blocking power element 17 is an oil cylinder.

[0060] The water outlet of the diesel engine cooling box 6 is communicated with the filtering box body and located above the filter screen 13. The drain pipe 15 is arranged close to the most bottom end of the inclination of the filter screen 13. The connecting pipe 12 is provided with a seawater filter 18. The water outlet of the diesel engine cooling box 6 is connected to the filtering box body and located above the filter screen 13, so that the backflow hot water after heat exchange can directly flush the upper surface of the filter screen 13. The hot water can dissolve part of the oil and fat impurities to prevent blockage. The drain pipe 15 is arranged close to the most bottom end of the inclination of the filter screen 13. This layout conforms to the collection law of the impurities naturally sliding down due to gravity, so that when flushing, the impurities washed off by the water flow can be quickly discharged out of the system with the shortest path and the smallest resistance, the sewage efficiency is greatly improved, and the secondary deposition of impurities in the box body is avoided.

[0061] The seawater filter 18 installed on the connecting pipe 12 constitutes the pre-filter unit of this application. It can pre-filter out larger suspended solids and fibrous impurities before the seawater enters the main filtration system, which significantly reduces the filtration load on the downstream filter screen 13, extends its continuous working time, and reduces the rinsing frequency, thereby improving the stability and economy of the entire system operation.

[0062] like Figure 1 , Figures 3 to 5 As shown in the present application, the freezer 3 includes a freezer body, and the freezer body is provided with a water injection mechanism 31, an ice-making mechanism 32, and an ice-crushing mechanism 33. The water injection mechanism 31 is used to inject seawater into the ice-making mechanism 32, the ice-making mechanism 32 is used to freeze the seawater to make ice, and the ice-crushing mechanism 33 is used to crush the made ice into ice chips.

[0063] The water injection mechanism 31 includes a U-shaped water injection frame 311, which can reciprocate horizontally. The U-shaped water injection frame 311 is horizontally positioned with its opening facing the ice-making mechanism 32. A water injection channel 312 is provided on the U-shaped water injection frame 311, which connects the inner cavity of the U-shaped water injection frame 311 to one end of the connecting pipe 313. The other end of the connecting pipe 313 is connected to the outlet of the filter device 1. When ice is needed, water must first be injected. The U-shaped water injection frame 311 moves horizontally to the working position, so that its open end completely covers the upper and lower ends of the ice-making tube 321, forming a sealed water injection space. Then, some seawater from the filter device 1 is injected into the ice-making tube 321 through the connecting pipe 313 and the water injection channel 312, thus completing the water injection.

[0064] The ice-making mechanism 32 includes a vertically fixed ice-making tube 321 with openings at both ends. A ring-shaped liquid nitrogen tank 322 is fixed to the outer wall of the ice-making tube 321, and the liquid nitrogen tank 322 is connected to an external liquid nitrogen replenishment device. During water injection and ice making, a U-shaped water injection frame 311 covers both ends of the ice-making tube 321, and the water injection channel 312 connects the connecting pipe 313 to the inner cavity of the ice-making tube 321. After ice making, the U-shaped water injection frame 311 moves horizontally and fully exposes the ice-making tube 321. A pushing mechanism 34 is provided above the ice-making tube 321. 4 is used to push the ice out of the ice-making tube 321; when the ice-making tube 321 is filled with seawater, the liquid nitrogen circulating in the liquid nitrogen tank 322 begins to rapidly cool the ice-making tube 321, causing the seawater inside to freeze and solidify quickly, forming an integral ice column that fits the shape of the tube wall. After the ice-making is completed, the U-shaped water injection rack 311 moves horizontally back to its original position, completely exposing the ice-making tube 321, making room for the de-icing process. The pushing mechanism 34 above starts to work, pushing the solidified ice column out of the ice-making tube 321 completely, allowing it to fall naturally to the ice-crushing mechanism 33 below under the action of gravity.

[0065] The ice crushing mechanism 33 is arranged below the ice making tube 321, and the ice crushing mechanism 33 includes two opposite arranged crushing plates 331, the two crushing plates 331 can be close to or away from each other, and the two crushing plates 331 form an ice crushing area for crushing ice between them, and a conveying auger 332 is installed below the two crushing plates 331, the conveying auger 332 is used to push the crushed ice chips to the mixing box 5; the falling ice column first falls between the two opposite arranged crushing plates 331, the two crushing plates 331 reciprocate towards each other to crush the ice column, and the falling ice chips are captured by the rotating conveying auger 332 and forwarded, and finally pushed into the mixing box 5 for subsequent mixing.

[0066] In the present application, the U-shaped water injection rack 311 includes a top plate 3111, a bottom plate 3112 and a side plate 3113 connected between the two, the water injection channel 312 is opened on the top plate 3111, and the transition hose 314 is connected between the water injection channel 312 and the connecting pipe two 313; the side plate 3113 is provided with a translation motor 315, the output shaft of the translation motor 315 penetrates the side plate 3113 and is connected with a horizontal screw rod 316, the screw rod 316 is matched with a nut 318 installed on a translation bracket 317, and the translation bracket 317 is fixedly installed in the interior of the freezer box body; the side plate 3113 is provided with a horizontally arranged guide rod 319, and the guide rod 319 penetrates the translation bracket 317.

[0067] The pushing mechanism 34 includes an electric telescopic rod 341 fixedly arranged in the freezer box body, the electric telescopic rod 341 is vertically arranged and its action end is arranged towards the ice making tube 321, and the action end of the electric telescopic rod 341 is provided with a push plate 342; the push plate 342 is a circular plate and is coaxially arranged with the ice making tube 321. After receiving the instruction, the action end of the electric telescopic rod 341 extends downward to drive the disc-shaped push plate 342 connected therewith to move in the vertical direction. Since the push plate 342 is coaxially arranged with the ice making tube 321, it can accurately and uniformly contact the entire top surface of the ice column. Under the continuous pushing of the electric telescopic rod 341, the push plate 342 smoothly and completely pushes the ice column out of the ice making tube 321, and the ice column falls from the lower opening of the ice making tube 321 under the action of gravity into the crushing area of the ice crushing mechanism 33 arranged directly below, thereby preparing for the subsequent crushing process.

[0068] The ice crushing mechanism 33 comprises a conveying frame 333, the cross section of the conveying frame 333 is an open upward U-shaped structure, two crushing plates 331 are respectively installed on the two side walls of the conveying frame 333; the side walls of the conveying frame 333 are provided with crushing hydraulic cylinders 334 corresponding to the crushing plates 331, the action end of the crushing hydraulic cylinders 334 is connected with a U-shaped push rod 335, both ends of the U-shaped push rod 335 are connected with the crushing plates 331; the bottom of the conveying frame 333 is provided with a moving auger 332, a screen 336 is arranged between the two crushing plates 331 and the moving auger 332, the screen 336 is horizontally installed between the two side walls of the conveying frame 333, one end of the moving auger 332 extends out of the conveying frame 333 and is power connected with a moving motor 337, the moving auger 332 pushes the crushed ice chips to the mixing box 5.

[0069] When the ice blocks fall between the two oppositely arranged crushing plates 331, the crushing hydraulic cylinders 334 start to work, the action end of the crushing hydraulic cylinders 334 drives the two crushing plates 331 to make reciprocating motion in opposite directions through the U-shaped push rod 335, so that the ice blocks are crushed into small pieces through multiple extrusions. The crushed ice materials fall on the screen 336 below, the fine ice chips meeting the size requirements fall through the mesh holes of the screen 336, while the ice blocks with larger particle size are left on the screen 336 and continue to be crushed by the crushing plates 331 again until the size meets the requirements and can pass through the screen. The qualified ice chips passing through the screen 336 fall into the bottom of the conveying frame 333 and are captured by the rotating moving auger 332, under the driving of the moving motor 337, the auger blades continuously rotate and push the ice chips forward along the axial direction of the conveying frame 333, so that the ice chips are uniformly conveyed into the mixing box 5, completing the whole process of ice crushing and conveying.

[0070] Preferably, the top of the crushing plate 331 is provided with an inclined outward guide portion 3311, and a plurality of anti-skid protrusions 3312 are protruded on the inner wall of the crushing plate 331; an inclined chute 338 is communicated between the conveying frame 333 and the mixing box 5, the chute 338 is a closed chute, the top end of the chute 338 is arranged close to the other end of the moving auger 332, the moving auger 332 pushes the crushed ice chips into the chute 338, and the ice chips in the chute 338 are slid to the mixing box 5. The guide portion 3311 receives the falling ice blocks and guides them into the crushing area between the two crushing plates 331, preventing the ice blocks from being stuck on the top of the crushing plate 331 or the edge of the conveying frame 333. The anti-skid protrusions 3312 increase the friction between the inner wall of the crushing plate 331 and the ice blocks, preventing the ice blocks from slipping or rotating when being pressed, so that the crushing force can more effectively act on the ice blocks, improving the crushing efficiency. The chute 338 is inclinedly arranged between the conveying frame 333 and the mixing box 5. The closed structure uses gravity to convey the ice chips, reducing the conveying energy consumption; at the same time, it isolates the air exchange between the inside and outside, preventing the loss of cold energy; and provides a concentrated and directional transmission path for the ice chips, ensuring that they accurately enter the mixing box 5.

[0071] AsFigure 1 、 Figure 6 As shown in the drawings, in the present application, the pre-cooling tank 4 comprises a pre-cooling tank body, which is in communication with the freezing tank 3, and the gas temperature in the freezing tank 3 is lower than that in the pre-cooling tank body; a partition plate 41 is fixedly arranged in the pre-cooling tank body, which divides the inner cavity of the pre-cooling tank body into an independent air blowing cavity and a pre-cooling cavity; a fan 42 is installed in the air blowing cavity, and the fan 42 is in communication with the freezing tank 3 through an air cooling pipe 43; two air guide pipes 44 and a cooling pipe 45 are installed in the pre-cooling cavity, the two air guide pipes 44 are arranged perpendicularly to the partition plate 41, one end of the air guide pipe 44 is open and arranged in the air blowing cavity, a plurality of air outlets 441 are formed in the air guide pipe 44, and the air outlets 441 in the two air guide pipes 44 are oppositely arranged; the cooling pipe 45 is installed between the two air guide pipes 44, the cooling pipe 45 has an S-shaped structure, a water inlet of the cooling pipe 45 is in communication with a water outlet of the filtering device 1 through a connecting pipe three 451, and a water outlet of the cooling pipe 45 is in communication with the mixing tank 5.

[0072] The fan 42 draws low-temperature gas from the freezing tank 3 through the air cooling pipe 43 and sends the low-temperature gas into the air blowing cavity formed by the partition plate 41, the low-temperature gas enters the two air guide pipes 44 in the air blowing cavity and is uniformly sprayed through the oppositely arranged air outlets 441 on the pipe wall, thereby forming a uniform low-temperature air curtain in the pre-cooling cavity; at the same time, the seawater from the filtering device 1 flows into the S-shaped winding cooling pipe 45 in the pre-cooling cavity through the connecting pipe three 451, the heat of the seawater is fully exchanged with the low-temperature air curtain through the pipe wall during the flow of the seawater through the cooling pipe 45, thereby realizing cooling, and the cooled seawater finally flows out of the water outlet of the cooling pipe 45 and enters the mixing tank 5.

[0073] In this structure, the low-temperature waste gas of the freezing tank 3 is recycled by the fan 42 and the air cooling pipe 43, thereby realizing secondary utilization of the system cold energy and significantly reducing the energy consumption; the structure of the air guide pipe 44 and the oppositely arranged air outlets 441 can form a uniform and stable cooling air field, thereby ensuring uniform heat exchange of each part of the S-shaped cooling pipe 45 and effectively improving the heat exchange efficiency; the S-shaped winding arrangement of the cooling pipe 45 greatly increases the effective heat exchange area, so that the seawater can be fully heat-exchanged with the low-temperature air, thereby realizing efficient pre-cooling of the seawater in a limited space.

[0074] As shown in the drawings, in the present application, the pre-cooling tank 4 comprises a pre-cooling tank body, which is in communication with the freezing tank 3, and the gas temperature in the freezing tank 3 is lower than that in the pre-cooling tank body; a partition plate 41 is fixedly arranged in the pre-cooling tank body, which divides the inner cavity of the pre-cooling tank body into an independent air blowing cavity and a pre-cooling cavity; a fan 42 is installed in the air blowing cavity, and the fan 42 is in communication with the freezing tank 3 through an air cooling pipe 43; two air guide pipes 44 and a cooling pipe 45 are installed in the pre-cooling cavity, the two air guide pipes 44 are arranged perpendicularly to the partition plate 41, one end of the air guide pipe 44 is open and arranged in the air blowing cavity, a plurality of air outlets 441 are formed in the air guide pipe 44, and the air outlets 441 in the two air guide pipes 44 are oppositely arranged; the cooling pipe 45 is installed between the two air guide pipes 44, the cooling pipe 45 has an S-shaped structure, a water inlet of the cooling pipe 45 is in communication with a water outlet of the filtering device 1 through a connecting pipe three 451, and a water outlet of the cooling pipe 45 is in communication with the mixing tank 5. Figure 1 、 Figure 7As shown, the mixing box 5 comprises a mixing box body, a stirring shaft 51 is rotatably installed in the mixing box body, one end of the stirring shaft 51 is power-connected with a stirring motor 52, and a plurality of stirring blades 53 are installed on the stirring shaft 51 along the axial direction thereof; the inner cavity of the mixing box body is communicated with the freezing box 3, the inner cavity of the mixing box body is communicated with the pre-cooling box 4 through a connecting pipe four 54, the ice chips made by the freezing box 3 and the seawater cooled by the pre-cooling box 4 are mixed in the mixing box body, the inner cavity of the mixing box body is communicated with the diesel engine cooling box 6 through a connecting pipe five 55, and the diesel engine cooling box 6 is communicated with the filter device 1 through a connecting pipe six 61.

[0075] The ice chips made by the freezing box 3 and the seawater cooled by the pre-cooling box 4 enter the mixing box body respectively, the stirring motor 52 drives the stirring shaft 51 and the stirring blades 53 to rotate, so that the ice chips and the seawater are fully mixed to form a uniform low-temperature medium, the ice chips are prevented from being caked, the medium enters the diesel engine cooling box 6 through the connecting pipe five 55, is changed into return water after completing heat exchange, and then returns to the filter device 1 through the connecting pipe six 61. The process realizes uniform mixing and closed circulation of the medium, improves the cooling efficiency, and fundamentally eliminates the scaling problem.

[0076] The working process of the application is as follows: the seawater first enters the filter box 11 after being coarsely filtered by the seawater filter 18, the water flow passes through the inclined filter screen 13, impurities are intercepted, and the filtered clean water is divided into two routes: one route enters the freezing box 3 through the connecting pipe two 313, and the other route enters the pre-cooling box 4 through the connecting pipe three 451.

[0077] In the freezing box 3, the U-shaped water injection frame 311 of the water injection mechanism 31 moves to the upper and lower ends of the ice-making pipe 321 to form a sealed space, seawater is injected, the liquid nitrogen box 322 cools the ice-making pipe 321 to form ice columns in the internal seawater, the U-shaped water injection frame 311 is withdrawn, the ice columns are pushed to the ice crushing mechanism 33 by the pushing mechanism 34, the ice blocks are crushed by the crushing plate 331, and the qualified ice chips are sent to the mixing box 5 by the conveying auger 332 through the chute 338.

[0078] In the pre-cooling box 4, the fan 42 introduces the low-temperature gas of the freezing box 3 through the air cooling pipe 43, forms a uniform air curtain through the air outlet 441 of the air guide pipe 44, and the seawater flowing through the S-shaped cooling pipe 45 is cooled after heat exchange with the air curtain and also enters the mixing box 5.

[0079] In the mixing box 5, the stirring mechanism mixes the ice chips and the low-temperature seawater into a uniform low-temperature medium, the medium enters the diesel engine cooling box 6 through the connecting pipe five 55, the medium exchanges heat with the fresh water cooling system in the diesel engine cooling box 6 to absorb heat, the ice chips melt to absorb a large amount of latent heat, the cooling efficiency is significantly improved, the water flow after heat absorption returns to the filter device 1 through the connecting pipe six 61, and a complete closed circulation is formed. The circulation process not only realizes the reuse of the cooling medium, but also fundamentally avoids the evaporation and concentration of seawater, and completely solves the scaling and blocking problems.

[0080] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A marine diesel engine cooling system, characterized in that, include: A filter device (1) is provided, wherein the inlet of the filter device (1) is connected to the outside seawater. Cooling device (2), the cooling device (2) includes a freezing box (3), a precooling box (4) and a mixing box (5); the freezing box (3) is connected to the outlet of the filter device (1), the freezing box (3) is used to freeze part of the filtered seawater and make ice chips, the ice chip outlet of the freezing box (3) is connected to the mixing box (5); the precooling box (4) is connected to the outlet of the filter device (1), the precooling box (4) is used to cool the remaining filtered seawater, the outlet of the precooling box (4) is connected to the mixing box (5); the outlet of the mixing box (5) is connected to the diesel engine cooling box (6), the outlet of the diesel engine cooling box (6) is connected to the filter device (1).

2. The marine diesel engine cooling system as described in claim 1, characterized in that, The filtration device (1) includes a filter box (11), and the inlet of the filter box (11) is connected to the outside seawater through a connecting pipe (12). The filter box (11) includes a filter box body, and a filter screen (13) is fixed inside the filter box body. One side of the filter screen (13) is inclined downward. A blocking block (14) is provided below the filter screen (13). The blocking block (14) can slide back and forth vertically. The top surface of the blocking block (14) is inclined and has the same inclination direction and inclination angle as the filter screen (13). A drain pipe (15) connected to the outside is installed on the filter box body. The bottom of the sealing block (14) is connected to the drive end of the sealing power component (17) via a top rod (16).

3. The marine diesel engine cooling system as described in claim 2, characterized in that, The outlet of the diesel engine cooling box (6) is connected to the filter box and located above the filter screen (13), and the drain pipe (15) is set near the bottom of the inclined end of the filter screen (13). A seawater filter (18) is installed on the connecting pipe (12).

4. The marine diesel engine cooling system as described in claim 1, characterized in that, The freezer (3) includes a freezer body, and the freezer body is provided with a water injection mechanism (31), an ice making mechanism (32) and an ice crushing mechanism (33); The water injection mechanism (31) includes a U-shaped water injection frame (311), which can reciprocate in the horizontal direction. The U-shaped water injection frame (311) is horizontally arranged and its opening faces the ice-making mechanism (32). A water injection channel (312) is provided on the U-shaped water injection frame (311). The water injection channel (312) connects the inner cavity of the U-shaped water injection frame (311) to one end of the connecting pipe two (313), and the other end of the connecting pipe two (313) is connected to the outlet of the filter device (1). The ice-making mechanism (32) includes a vertically fixed ice-making tube (321), which is open at both ends. A ring-shaped liquid nitrogen tank (322) is fixed on the outer wall of the ice-making tube (321), and the liquid nitrogen tank (322) is connected to an external liquid nitrogen replenishment device. When water is injected and ice is made, the U-shaped water injection frame (311) covers both ends of the ice-making tube (321), and the water injection channel (312) connects the connecting pipe (313) to the inner cavity of the ice-making tube (321). After ice is made, the U-shaped water injection frame (311) moves horizontally and fully exposes the ice-making tube (321). A pushing mechanism (34) is provided above the ice-making tube (321), which is used to push the ice in the ice-making tube (321) out. The ice-crushing mechanism (33) is located below the ice-making tube (321). The ice-crushing mechanism (33) includes two opposing crushing plates (331). The two crushing plates (331) can move closer to each other or further apart. An ice-crushing area for crushing ice is formed between the two crushing plates (331). A transfer auger (332) is installed below the two crushing plates (331). The transfer auger (332) is used to push the ice chips generated by crushing to the mixing box (5).

5. The marine diesel engine cooling system as described in claim 4, characterized in that, The U-shaped water injection frame (311) includes a top plate (3111), a bottom plate (3112), and a side plate (3113) connecting the two. The water injection channel (312) is opened on the top plate (3111), and a transition hose (314) is connected between the water injection channel (312) and the connecting pipe (313). A translation motor (315) is installed on the side plate (3113). The output shaft of the translation motor (315) passes through the side plate (3113) and is connected to a horizontally arranged lead screw (316). The lead screw (316) is adapted to a nut (318) installed on a translation bracket (317). The translation bracket (317) is fixedly installed inside the freezer body. A horizontally arranged guide rod (319) is installed on the side plate (3113), and the guide rod (319) passes through the translation bracket (317).

6. The marine diesel engine cooling system as described in claim 4, characterized in that, The pushing mechanism (34) includes an electric telescopic rod (341) fixed in the freezer body. The electric telescopic rod (341) is arranged vertically and its actuating end is arranged towards the ice making tube (321). A push plate (342) is installed on the actuating end of the electric telescopic rod (341). The pusher plate (342) is a circular plate and is coaxially arranged with the ice-making tube (321).

7. The marine diesel engine cooling system as described in claim 4, characterized in that, The ice-crushing mechanism (33) includes a conveyor frame (333), the cross-section of which is a U-shaped structure with the opening facing upwards, and the two crushing plates (331) are respectively installed on the two side walls of the conveyor frame (333); A crushing hydraulic cylinder (334) corresponding to the crushing plate (331) is installed on the side wall of the conveyor frame (333). The actuating end of the crushing hydraulic cylinder (334) is connected to the U-shaped push rod (335). Both ends of the U-shaped push rod (335) are connected to the crushing plate (331). The bottom of the conveyor frame (333) is equipped with the transfer auger (332). A screen (336) is provided between the transfer auger (332) and the two crushing plates (331). The screen (336) is horizontally installed between the two side walls of the conveyor frame (333). One end of the transfer auger (332) extends out of the conveyor frame (333) and is powered by the transfer motor (337). The transfer auger (332) pushes the ice chips generated by crushing to the mixing box (5).

8. The marine diesel engine cooling system as described in claim 7, characterized in that, The top of the crushing plate (331) is provided with an outwardly inclined guide part (3311), and a number of anti-slip protrusions (3312) are provided on the inner wall of the crushing plate (331). An inclined chute (338) connects the conveyor frame (333) and the mixing box (5). The chute (338) is a closed chute. The top of the chute (338) is located near the other end of the transfer auger (332). The transfer auger (332) pushes the ice chips generated by the crushing into the chute (338). The ice chips entering the chute (338) are slid into the mixing box (5).

9. The marine diesel engine cooling system as described in claim 1, characterized in that, The precooling box (4) includes a precooling box body, which is connected to the freezing box (3). The gas temperature inside the freezing box (3) is lower than the gas temperature inside the precooling box body. The precooling chamber is fixedly provided with a partition (41), which divides the inner cavity of the precooling chamber into an independent blower chamber and a precooling chamber; a fan (42) is installed in the blower chamber, and the fan (42) is connected to the freezer (3) through an air-cooling pipe (43); The precooling chamber is equipped with two air guide pipes (44) and one cooling pipe (45). The two air guide pipes (44) are set perpendicular to the partition (41). One end of the air guide pipe (44) is open and located in the blower chamber. The air guide pipe (44) has several air outlets (441). The air outlets (441) on the two air guide pipes (44) are arranged opposite to each other. The cooling pipe (45) is installed between the two air guide pipes (44). The cooling pipe (45) has an S-shaped structure. The water inlet of the cooling pipe (45) is connected to the water outlet of the filter device (1) through the connecting pipe three (451). The water outlet of the cooling pipe (45) is connected to the mixing box (5).

10. The marine diesel engine cooling system as described in claim 1, characterized in that, The mixing box (5) includes a mixing box body, and a stirring shaft (51) is rotatably installed inside the mixing box body. One end of the stirring shaft (51) is poweredly connected to a stirring motor (52), and a plurality of stirring blades (53) are installed on the stirring shaft (51) along its axial direction. The inner cavity of the mixing chamber is connected to the freezing chamber (3). The inner cavity of the mixing chamber is connected to the precooling chamber (4) through connecting pipe four (54). The ice chips produced by the freezing chamber (3) are mixed with the seawater cooled by the precooling chamber (4) in the mixing chamber. The inner cavity of the mixing chamber is connected to the diesel engine cooling chamber (6) through connecting pipe five (55). The diesel engine cooling chamber (6) is connected to the filter device (1) through connecting pipe six (61).

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