High-explosion-pressure high-power V-type diesel engine power system

Abstract

The present technology relates to the technical field of diesel engines, and discloses a high-explosion-pressure high-power V-shaped diesel engine power system, which comprises a body, a cylinder arranged in the body, a flywheel arranged on one side of the body, a damper arranged on the other side of the body, a crankshaft arranged in the body and connected to the flywheel and the damper at two ends, main bearings arranged outside the crankshaft, a plurality of main bearing covers arranged at the lower end of the body and used for supporting the main bearings, main journal pins arranged on the crankshaft and matched with the number of the cylinders of the body, main bearing bushings arranged on the main journal pins, crank pins arranged on the crankshaft and matched with the number of the cylinders of the body, connecting rod bushings arranged on the crank pins, and pistons and connecting rods arranged in the cylinders of the body and preassembled with cylinder sleeves and then synchronously assembled into the body. The diesel engine power system for a data center standby generator set is greater than 25MPa in explosion pressure, extremely compact, low in cost and greater than 2MW in power.

Description

Technical Field

[0001] This technology relates to the field of diesel engine technology, specifically to a high-explosion-pressure, high-power V-type diesel engine power system. Background Technology

[0002] Currently, the demand for computing power for large AI models is growing explosively, and the construction of data centers is accelerating, leading to an increased demand for backup diesel generator sets. High-density AI server racks require backup power supplies with higher power output capabilities, increasing the power requirement for a single diesel generator set to 2-3MW. To avoid server downtime, backup diesel generator sets in data centers need to have high reliability. Furthermore, data center construction adopts a modular architecture and uses containerized diesel generator sets, requiring diesel engines to have compact dimensions.

[0003] However, most diesel engines used in standby generator sets on the market are extensions of traditional applications such as mining trucks, construction machinery, and locomotives. There are no designs specifically for standby generator sets for data centers, making it difficult to fully meet the requirements of high power and small size in data center construction. The highest explosion pressure of diesel engines on the market is around 17-20MPa, and 2-3MW diesel engines are relatively large in size. In standby generator sets, the diesel engine is connected to the generator at the rear. To reduce the cost of the unit, a single-bearing generator with steel plates is often used. The generator has a large inertia, which places high demands on the diesel engine. Higher explosion pressure of a diesel engine means that, with the same displacement and volume, more fuel can be burned in each combustion cycle and the combustion thermal efficiency is higher, thus generating more power. This allows for greater power output within the same size diesel engine. However, higher explosion pressure and higher power result in higher loads on key components such as the crankshaft, piston, connecting rod, cylinder liner, and engine block. The structure of these key components is the core of achieving the design and reliability of high explosion pressure, high power diesel engines. Utility Model Content

[0004] The technical problem this invention aims to solve is that existing diesel engines cannot meet the high-power, small-size requirements of backup generator sets for data centers.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a high-explosion-pressure, high-power V-type diesel engine power system, including an engine block, a cylinder inside the engine block, a flywheel on one side of the engine block and a shock absorber on the other side, a crankshaft inside the engine block connecting the flywheel and the shock absorber at both ends, a main bearing outside the crankshaft, multiple main bearing caps for supporting the main bearing at the lower end of the engine block, a main journal on the crankshaft matching the number of cylinders in the engine block, a main bearing shell on the main journal, a crank pin matching the number of cylinders in the engine block, a connecting rod bearing shell on the crank pin, a piston and a connecting rod inside the cylinder of the engine block, and the piston and connecting rod are pre-assembled with the cylinder liner and then synchronously installed into the engine block.

[0006] Optionally, the crankshaft is provided with a crank arm, and a balance weight is connected to the crank arm by multiple bolts.

[0007] Optionally, the bottom surface of the main bearing cover is provided with two long studs that are connected to the machine body, and the long studs are provided with round-headed nuts. The side surface of the main bearing cover is provided with tie bolts for connecting to the machine body.

[0008] Optionally, the top surface of the main bearing cover is provided with two directional pins for positioning, and the two sides of the main bearing cover are provided with protrusions for positioning.

[0009] Optionally, the machine body is provided with a main bearing hole for mounting the main bearing, and the main bearing cover is provided with unloading grooves on both sides near the main bearing hole.

[0010] Optionally, the top surface of the cylinder is provided with a shoulder for positioning and supporting the cylinder liner, the middle part of the cylinder is provided with a sealing ring, and the bottom of the cylinder is provided with a ring.

[0011] Optionally, a single-bearing generator is also included, which is located outside the machine body and connected to the flywheel via steel plates.

[0012] Optionally, the ratio of the main journal diameter to the cylinder diameter is 1.1-1.2, and the ratio of the main bearing width to the cylinder diameter is 0.25-0.3.

[0013] Optionally, the ratio of the crankpin diameter to the cylinder diameter is 0.8-0.9, and the width-to-diameter ratio of the connecting rod bearing is 0.3-0.32.

[0014] In summary, this utility model has at least one of the following beneficial effects:

[0015] This utility model provides a diesel engine power system for data center backup generator sets that meets the requirements of greater than 2MW power output, is extremely compact, low-cost, and has a burst pressure greater than 25MPa through the balanced design of key component structures.

[0016] 1. The main journal diameter ratio of this utility model is 1.1-1.2, the matching main bearing width-to-diameter ratio is 0.25-0.3, the crank pin diameter to cylinder diameter ratio is 0.8-0.9, the matching connecting rod bearing width-to-diameter ratio is 0.3-0.32, and the main bearing cap thickness to main bearing hole diameter ratio is 0.25-0.28. This design improves the compactness of the diesel engine while meeting the reliability requirements of high explosion pressure and high power.

[0017] 2. Each crank arm of the crankshaft is equipped with an independent balance block, and the dynamic balance rate of the crankshaft is 90-100%. This reduces the internal stress of the crankshaft and the dynamic load of the main bearing during high explosion pressure operation, and improves the fatigue resistance of the crankshaft and the reliability of the bearings during high explosion pressure and high power operation of the diesel engine.

[0018] 3. The crankshaft features a large-diameter main journal and crank pin diameter, high balance rate, and symmetrical crank arrangement, which allows the diesel generator set to avoid the natural frequency of the generator set shaft system during operation. Using 1-2 silicone oil vibration dampers can meet the torsional vibration requirements of the single-bearing generator shaft system and reduce the cost of the generator set.

[0019] 4. The ratio of the main bearing cap's long stud to the machine body height is 0.7-0.8, which improves the consistency of axial force and reduces axial force attenuation during high-pressure, high-power operation, and enhances the connection reliability between the main bearing cap and the machine body.

[0020] 5. The main bearing cover of the main bearing hole has an unloading groove to ensure that the main bearing bush can adapt to the deformation of the engine body and the edge of the main bearing cover, reduce the load on the edge of the main bearing, and improve the operating reliability of the bearing bush in the high-explosion-pressure, high-power operation of the diesel engine.

[0021] 6. The positioning and three-section support of the upper part of the cylinder liner allow the cylinder liner to use a small wall thickness to improve the rigidity of the engine block and cylinder liner. The cylinder liner wall thickness to cylinder diameter ratio is 0.07-0.08, which reduces the overall size of the diesel engine and controls the cylinder liner deformation during high explosion pressure operation. This ensures a reasonable clearance between the piston and rings and the cylinder liner, obtains a good fuel-oil ratio and low friction power consumption, and improves the thermal efficiency of the diesel engine. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the X-direction cross-section of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0023] Figure 2 This is a schematic diagram of the Y-direction cross-section of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0024] Figure 3 This is a schematic diagram of the crankshaft and single-bearing generator structure of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0025] Figure 4 This is a schematic diagram of the crankshaft and crankpin structure of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0026] Figure 5 This is a schematic diagram of the piston and connecting rod installation of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0027] Figure 6 This is a schematic diagram of the cylinder structure of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0028] Figure 7 This is a schematic cross-sectional view of the main bearing cap of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0029] Figure 8 for Figure 1 Enlarged schematic diagram of another section of the main bearing cap at point A;

[0030] Figure 9 This is a schematic diagram of the main bearing cap structure of the high-explosive-pressure, high-power V-type diesel engine power system of this utility model;

[0031] In the diagram: 1. Engine block; 2. Crankshaft; 3. Cylinder liner; 4. Piston; 5. Connecting rod; 6. Shock absorber; 7. Flywheel; 8. Main bearing shell; 9. Connecting rod bearing shell; 10. Single bearing generator; 11. Main journal; 12. Crank pin; 13. Crank arm; 14. Balance weight; 15. Bolt; 16. Crank crank; 17. Main bearing cap; 18. Long stud; 19. Round head nut; 20. Tie bolt; 21. Steering pin; 22. Protrusion; 23. Unloading groove; 24. Shoulder; 25. Sealing ring; 26. Ring. Detailed Implementation

[0032] The following combination Figure 1-9 This utility model will be described in further detail.

[0033] This utility model discloses a structural scheme for a high-explosion-pressure V-type diesel engine power system with a maximum explosion pressure greater than 25MPa and a power greater than 2MW, meeting the high-power, compact, and high-reliability requirements of data center diesel generator sets. This system structural scheme can be extended to applications with 12-cylinder, 16-cylinder, and 20-cylinder diesel engines. (Refer to...) Figure 1 and Figure 2 The system includes a body 1, which contains cylinders. A flywheel 7 is located on one side of the body 1, and a shock absorber 6 is located on the other side. A crankshaft 2 is located inside the body 1, with the flywheel 7 and the shock absorber 6 connected at both ends. A main bearing is located on the outside of the crankshaft 2. Multiple main bearing caps 17 for supporting the main bearing are located at the lower end of the body 1. A main journal 11 matching the number of cylinders in the body 1 is located on the crankshaft 2. A main bearing 8 is located on the main journal 11. A crank pin 12 matching the number of cylinders in the body 1 is also located on the crankshaft 2. A connecting rod bearing 9 is located on the crank pin 12.

[0034] Specifically, refer to Figure 3 and Figure 4 The main journal 11 adopts a large diameter matching narrow main bearing 8, which can reduce the axial dimension and meet the compact design of the diesel engine; the ratio of the diameter of the main journal 11 to the cylinder diameter is 1.1-1.2, and the width-to-diameter ratio of the main bearing 8 is 0.25-0.3, which can improve the crankshaft's fatigue resistance, while reducing the bearing load and ensuring the reliability of the bearing during high-explosive-pressure operation.

[0035] The crankpin 12 is matched with a large-diameter connecting rod bearing 9 with a width-to-diameter ratio of 0.3-0.32 and assembled in parallel. The diameter of the crankpin 12 is 0.8-0.9 compared to the cylinder diameter, which can reduce the specific pressure of the connecting rod bearing 9 and improve the stiffness of the long crankshaft of the 12-20 cylinder diesel engine and the fatigue resistance of the crankpin 12. The crankshaft 2 is equipped with a crank arm 13, and a balance block 14 is connected to the crank arm 13 by multiple bolts 15. Each crank arm 13 of the crankshaft 2 is equipped with an independent balance block 14. The dynamic balance rate of the crankshaft 2 reaches 90-100%, which reduces the internal stress of the crankshaft 2 and the dynamic load of the main bearing during high explosion pressure operation, and improves the fatigue resistance of the crankshaft and the reliability of the bearing during high explosion pressure operation.

[0036] In a further implementation, refer to Figure 4 It also includes a single-bearing generator 10, which is located outside the body 1 and connected to the flywheel 7 via a steel sheet;

[0037] Specifically, the rear end of the crankshaft 2 is connected to the generator steel plate via the flywheel 7 to transmit power. The crankshaft 2 adopts a crank 16 composed of a large-diameter main journal 11, crank pin 12, and crank pin 12 and crank arm 13 of each cylinder, which is arranged circumferentially. This allows the diesel engine crankshaft 2 to be matched with the generator shaft by using 1-2 silicone oil vibration dampers 6, so that the diesel engine unit avoids the natural frequency of the unit shaft system during operation and controls the torsional vibration of the unit shaft system. This structure can also meet the needs of dual-bearing generators connected by couplings, which is convenient for unit selection.

[0038] In a further implementation, refer to Figure 5 and Figure 6 The cylinder of the engine body 1 is equipped with a cylinder liner 3, a piston 4 and a connecting rod 5. The piston 4 and the connecting rod 5 are pre-installed with the cylinder liner 3 and then synchronously installed into the engine body 1. The connecting rod 5 is connected to the crankshaft 2. The top surface of the cylinder of the engine body 1 is provided with a shoulder 24 for positioning and supporting the cylinder liner 3. The middle part of the cylinder is provided with a sealing ring 25 and the bottom of the cylinder is provided with a ring 26.

[0039] Specifically, the shoulder 24 near the top of the engine block 1 is used for positioning and supporting the cylinder liner 3. The sealing ring 25 in the middle of the cylinder bore cooperates with the cylinder liner 3 through two sealing rings installed on the cylinder liner 3. The lower end of the cylinder bore is designed with a ring 26 that fits with the cylinder liner 3 with a small clearance for supporting the lower end of the cylinder liner 3. The positioning at the top and the three-stage support allow the cylinder liner 3 to have a small wall thickness, thereby improving the rigidity of the engine block 1 and the cylinder liner 3. The ratio of the cylinder liner 3 wall thickness to the cylinder diameter is 0.07-0.08, which reduces the overall size of the diesel engine while controlling the cylinder liner deformation during high explosion pressure operation, ensuring a reasonable clearance between the piston and rings and the cylinder liner, and obtaining a good fuel-oil ratio and low friction power consumption.

[0040] In a further implementation, refer to Figures 7-9The machine body 1 has a main bearing hole for mounting the main bearing. The bottom surface of the main bearing cover 17 has two long studs 18 connected to the machine body 1. The long studs 18 are equipped with round-head nuts 19. The side of the main bearing cover 17 is equipped with tie bolts 20 for connecting to the machine body 1. The top surface of the main bearing cover 17 is equipped with two directional pins 21 for positioning. The two sides of the main bearing cover 17 are equipped with protrusions 22 for positioning. The two sides of the main bearing cover 17 near the main bearing hole are equipped with unloading grooves 23.

[0041] Specifically, the height ratio of the long stud 18 to the engine block 1 is 0.7-0.8, which is used to improve the consistency of the stud axial force, reduce the axial force attenuation during high-pressure, high-power operation, and improve connection reliability; the round nut 19 is smaller in size than the hexagonal head nut under the same thread specification, which can reduce the clearance space with the crankshaft balance block 14; the thickness ratio of the main bearing cover 17 to the main bearing hole diameter is 0.25-0.28, which reduces the size of the diesel engine; there are two directional pins 21 on the main bearing cover 17 for positioning with the engine block 1 in the x direction, and a protrusion 22 on the main bearing cover 17 for positioning with the engine block 1 in the y direction, to ensure the consistency of the main bearing hole after the main bearing cover 17 is assembled, and to improve the operating reliability of the main bearing bush; an unloading groove 23 is designed on the main bearing cover 17 near the main bearing hole to ensure that the main bearing bush can adapt to the edge deformation of the engine block and the main bearing cover 17, reduce the edge load of the main bearing, and improve the operating reliability of the bearing bush.

[0042] In summary, this utility model provides a diesel engine power system for data center backup generator sets that has an explosion pressure greater than 25MPa, is extremely compact, low-cost, and meets the power requirement of greater than 2MW through the balanced design of key component structures.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-explosive-pressure, high-power V-type diesel engine power system, characterized in that, The machine includes a body (1), which contains cylinders. A flywheel (7) is located on one side of the body (1), and a shock absorber (6) is located on the other side. A crankshaft (2) is located inside the body (1) and connects the flywheel (7) and the shock absorber (6) at both ends. A main bearing is located outside the crankshaft (2). Multiple main bearing caps (17) for supporting the main bearing are located at the lower end of the body (1). A main journal (11) matching the number of cylinders in the body (1) is located on the crankshaft (2). A main bearing shell (8) is located on the main journal (11). A crank pin (12) matching the number of cylinders in the body (1) is also located on the crankshaft (2). A connecting rod bearing shell (9) is located on the crank pin (12). A piston (4) and a connecting rod (5) are located inside the cylinders of the body (1). The piston (4) and the connecting rod (5) are pre-installed with the cylinder liner (3) and then synchronously installed into the body (1).

2. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, The crankshaft (2) is provided with a crank arm (13), and a balance block (14) is connected to the crank arm (13) by a plurality of bolts (15).

3. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, The bottom surface of the main bearing cover (17) is provided with two long studs (18) that are connected to the machine body (1). The long studs (18) are provided with round head nuts (19). The side of the main bearing cover (17) is provided with tie bolts (20) for connecting to the machine body (1).

4. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 3, characterized in that, The top surface of the main bearing cover (17) is provided with two directional pins (21) for positioning, and the two sides of the main bearing cover (17) are provided with protrusions (22) for positioning.

5. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 4, characterized in that, The body (1) is provided with a main bearing hole for mounting the main bearing, and the main bearing cover (17) is provided with unloading grooves (23) on both sides near the main bearing hole.

6. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, The top surface of the cylinder of the machine body (1) is provided with a shoulder (24) for positioning and supporting the cylinder liner (3), the middle part of the cylinder is provided with a sealing ring (25), and the bottom of the cylinder is provided with a ring (26).

7. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, It also includes a single-bearing generator (10), which is located outside the body (1) and connected to the flywheel (7) by a steel sheet.

8. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, The ratio of the diameter of the main journal (11) to the cylinder diameter is 1.1-1.2, and the ratio of the width to the diameter of the main bearing (8) is 0.25-0.

3.

9. The high-explosive-pressure, high-power V-type diesel engine power system according to claim 1, characterized in that, The diameter of the crankpin (12) is 0.8-0.9 to the cylinder diameter, and the width-to-diameter ratio of the connecting rod bearing (9) is 0.3-0.32.

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