A marine main shaft driven constant speed power generation device

Abstract

The present invention discloses a ship-borne main shaft driven constant speed generator, comprising a housing and an input speed increasing mechanism, a stepless speed regulating mechanism, and an output speed reducing mechanism arranged in the housing. The main shaft driven constant speed device of the present invention inputs a large torque into the stepless speed regulating mechanism, and realizes a constant output of the speed through the mechanical stepless speed regulating mechanism, thereby realizing the use of the mechanical stepless speed regulating device on large torque driving equipment, and at the same time, the speed of the generator driven by the constant speed device is not changed by the change of the main engine speed, thereby ensuring the constant output of the generator output voltage and frequency, and ensuring the normal use of the electrical equipment on board. The energy conversion efficiency of the shaft belt power generation system is improved, the reliability of the shaft belt power generation system is improved, and the cost of the shaft belt generator system is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship shaft belt power generation transmission, and in particular, the present invention relates to a main shaft driven constant speed power generation device. Background Art

[0002] With the depletion of non-renewable energy around the world and people's pursuit of a clean environment, energy conservation and emission reduction are common themes facing mankind. In the shipbuilding industry, in order to reduce fuel consumption, the main engine drive shaft is used to directly drive the generator to generate electricity, replacing the dedicated auxiliary generator to drive the generator to generate electricity. This makes good use of the main engine's surplus power to generate electricity, which can achieve good energy conservation and emission reduction effects and bring considerable economic benefits.

[0003] However, the speed of the main engine (diesel engine) will change continuously with the changes in driving speed and load during operation. For example, the main diesel engine of a ship usually operates at a speed between 500rpm and 1000rpm. The unstable speed makes the voltage and frequency of the AC generator unstable, making the marine electrical equipment unable to work stably.

[0004] In order to solve the problem of unstable power generation voltage and frequency, the existing main engine shaft generator system uses a power electronic system to control and adjust the voltage and frequency so that the output voltage and frequency can work stably within the required range.

[0005] Although the current power electronic system has achieved the situation of unstable voltage and frequency of the shaft belt generator system, the existing system has certain technical limitations. For example, the patent document with the publication number CN204046480U discloses a technology of stabilizing voltage and frequency composed of a boost rectifier circuit, a DC bus energy storage capacitor, an inverter circuit, a sine wave filter, a processor a, and a processor b, which realizes the function of the shaft belt generator to supply power to the ship normally. However, due to the high cost of high-power power electronic devices and the lower reliability of electronic devices compared to pure mechanical systems, the energy conversion efficiency of the power electronic system is not very high. Therefore, a low-cost, high-transmission efficiency, and high-reliability main shaft driven constant speed generator is needed. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a ship main shaft driven constant speed generator, the purpose of which is to improve the energy conversion efficiency of the shaft belt generator system, improve the reliability of the shaft belt generator system, and significantly reduce the cost of the shaft belt generator system.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] A ship main shaft driven constant speed power generation device comprises a housing and an input speed increasing mechanism, a stepless speed regulating mechanism and an output speed reducing mechanism arranged in the housing, wherein the input speed increasing mechanism is connected to the ship main engine drive shaft via an input flange, the input speed increasing mechanism is connected to the stepless speed regulating mechanism via an input shaft driving gear, an input shaft driven gear, the stepless speed regulating mechanism is connected to the output speed reducing mechanism via an output shaft driving gear, an output shaft driven gear, and the output speed reducing mechanism is connected to the ship generator rotor via an output flange.

[0009] As an improvement of the present invention, the stepless speed regulation mechanism includes an input pulley shaft assembly, a transmission belt and an output pulley shaft assembly; the input pulley shaft assembly includes an input pulley shaft rotatably connected to a casing, the input pulley shaft is fixedly provided with an input pulley fixed cone disk, an input pulley movable cone disk axially movably connected to the input pulley shaft, and an input pulley piston driving the input pulley movable cone disk to move axially; the output pulley shaft assembly includes an output pulley shaft rotatably connected to the casing, the output pulley shaft is fixedly provided with an output pulley fixed cone disk, an output pulley movable cone disk axially movably connected to the output pulley shaft, and an output pulley piston driving the output pulley movable cone disk to move axially; the side surfaces of the transmission belt respectively cooperate with the side surfaces of the input pulley fixed cone disk and the input pulley movable cone disk on the input pulley shaft assembly, and the side surfaces of the transmission belt also respectively cooperate with the side surfaces of the output pulley fixed cone disk and the output pulley movable cone disk on the output pulley shaft assembly.

[0010] By adjusting the internal oil pressure of the input and output pulley pistons, the input and output pulley movable cones on the master and slave pulley assemblies are moved axially, thereby changing the meshing radius of the transmission belt and the master and slave cones respectively, thereby realizing continuous change of the speed of the output pulley assembly.

[0011] As an improvement of the present invention, the input speed-up mechanism includes an input shaft, an input shaft driving gear and an input shaft driven gear rotatably connected to the housing, the input shaft driving gear is connected to the input shaft via a key or is integrated with the input shaft, the input shaft driven gear is connected to the input pulley shaft via a key or is integrated with the input pulley shaft, the input shaft driving gear and the input shaft driven gear are meshed for transmission, and the diameter of the input shaft driving gear is larger than the diameter of the input shaft driven gear.

[0012] By adopting the above scheme, the function of increasing speed and reducing torque is realized, so that the low-speed and high-torque power input of the ship's main engine can be increased to a high-speed range suitable for the continuously variable transmission through the pair of gear mechanisms, while the torque is reduced to a range that the continuously variable transmission can withstand.

[0013] As an improvement of the present invention, the output reduction mechanism includes an output shaft, an output shaft driving gear and an output shaft driven gear rotatably connected to the housing, the output shaft driving gear is connected to the output pulley shaft via a key or is integrated with the output pulley shaft, the output shaft driven gear is connected to the output shaft via a key or is integrated with the output shaft, and the output shaft driving gear and the output shaft driven gear are meshed for transmission.

[0014] By matching the appropriate gear ratio, the generator driven by the output shaft can operate at a suitable speed.

[0015] In summary, the present invention has the following beneficial effects:

[0016] The large torque provided by the ship's main engine can be input to the input shaft, and the speed increase and torque reduction of the input shaft gear mechanism can greatly reduce the torque to a range that the continuously variable transmission can withstand. The power is output to the output reduction mechanism through the stepless speed regulation mechanism, and finally the power is transmitted to the generator. The continuous speed regulation of the stepless speed regulation device makes the generator speed not change with the main engine speed change, ensuring the constant speed output of the device, and realizing the constant speed drive of the engine through the mechanical system, thereby improving the power generation efficiency, thereby greatly improving the fuel utilization rate of the ship, and greatly reducing the cost of the shaft belt generator system and improving the reliability of the shaft belt generator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The diagram is a structural diagram of a ship-based main shaft driven constant speed power generation device.

[0018] In the figure, 1, input flange; 2, input shaft; 3, input shaft bearing a; 4, input shaft bearing b; 5, input shaft driving gear; 6, input shaft driven gear; 7, input pulley shaft; 71, input pulley fixed cone disk; 8, input pulley movable cone disk; 9, input pulley piston; 10, input pulley bearing a; 11, input pulley bearing b; 12, output pulley shaft; 121, output pulley fixed cone disk; 13, output pulley movable cone disk; 14, output pulley piston; 15, output pulley bearing a; 16, output pulley bearing b; 17, transmission belt; 18, output shaft driving gear; 19, output shaft driven gear; 20, output shaft; 21, output shaft bearing a; 22, output shaft bearing b; 23, output flange; 24, housing. DETAILED DESCRIPTION

[0019] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0020] Example:

[0021] like Figure 1 As shown, the present invention provides a marine main shaft driven constant speed power generation device, including an input speed increasing mechanism, a stepless speed regulating mechanism, an output speed reducing mechanism, a box body 24 and a connecting flange.

[0022] Specifically, if Figure 1 As shown, the input speed-up mechanism includes an input shaft 2, an input flange 1 installed at one end of the input shaft 2 for connecting with the driving shaft of the main engine of the ship, an input shaft bearing a3 and an input shaft bearing b4 for supporting the input shaft 2, an input shaft driving gear 5 installed on the input shaft 2, and an input shaft driven gear 6 installed on the input pulley shaft 7 described below.

[0023] The stepless speed regulating mechanism includes an input pulley assembly, an output pulley assembly and a transmission belt 17. The input pulley assembly includes an input pulley shaft 7, an input pulley movable cone disk 8 installed on the input pulley shaft 7 and axially movable, an input pulley piston 9 for providing hydraulic pressure to drive the input pulley movable cone disk 8 to move axially, an input pulley fixed cone disk 71 integrally arranged on the input pulley shaft 7 and correspondingly matched with the input pulley movable cone disk 8, an input pulley bearing a10 and an input pulley bearing b11 for supporting the entire input pulley assembly; the output pulley assembly includes an output pulley shaft 12, an output pulley movable cone disk 13 installed on the output pulley shaft 12 and axially movable, an output pulley piston 14 for providing hydraulic pressure to drive the output pulley movable cone disk 13 to move axially, an output pulley fixed cone disk 121 integrally arranged on the output pulley shaft 12 and correspondingly matched with the output pulley movable cone disk 13, and an output pulley bearing a15 and an output pulley bearing b16 for supporting the entire output pulley assembly.

[0024] The input pulley fixed cone disk 71 on the input pulley shaft 7 of the stepless speed regulating mechanism and the cone disk on the input pulley movable cone disk 8 are symmetrically formed at a certain angle, and the angles of the two side surfaces of the transmission belt 17 are the same as the angles of the cone disks. In this way, the two side surfaces of the transmission belt 17 cooperate with the two side surfaces of the input pulley fixed cone disk 71 and the input pulley movable cone disk 8. By providing hydraulic pressure to the input pulley piston 9, the input pulley movable cone disk 8, the transmission belt 17 and the input pulley fixed cone disk 71 are pressed against each other. Since there is a friction coefficient between the side surfaces of the transmission belt 17 and the side surfaces of the cone disk, the power on the input pulley shaft 7 is transmitted to the transmission belt 7 after the pressure is provided; similarly, the output pulley fixed cone disk 121 on the output pulley shaft 12 and the cone disk on the output pulley movable cone disk 13 are also symmetrically formed at a certain angle and the same as the angles of the two side surfaces of the transmission belt 17. By providing hydraulic pressure to the output pulley piston 14, the output pulley movable cone disk 13, the transmission belt 17 and the input pulley movable cone disk 13 are pressed against each other. The fixed cone discs 121 of the output pulley are pressed against each other, and the power of the transmission belt 17 can be transmitted to the output pulley shaft 12; and since the input pulley movable cone disc 8 and the output pulley movable cone disc 13 can both move axially, when the pressure in the input pulley piston 9 is increased, the input pulley movable cone disc 8 will push the transmission belt 17 to move radially, so that the meshing radius of the transmission belt 17 and the input pulley cone disc will increase. At the same time, since the length of the transmission belt 17 remains unchanged and the center distance between the input and output pulley shafts remains unchanged, the output pulley movable cone disc 13 will move in the direction of reducing the meshing radius of the transmission belt 17 and the output pulley cone disc, and in this process, the transmission ratio of the input pulley and the output pulley is continuously increased; on the contrary, if the pressure in the output pulley piston 14 is increased, the meshing radius of the transmission belt 17 and the output pulley cone disc will increase and the meshing radius of the input pulley cone disc will decrease, so that the transmission ratio of the input pulley and the output pulley is continuously reduced. In this way, by adjusting the pressure in the input pulley piston 9 and the output pulley piston 14, the output speed on the output pulley shaft 12 can be continuously changed, so that the speed and torque provided by the main engine can be continuously adjusted through the stepless speed regulation mechanism. When the speed of the main engine changes continuously, the speed on the output pulley shaft 12 can be kept constant through the continuous speed regulation of the stepless speed regulation mechanism.

[0025] The output reduction mechanism includes an output shaft driving gear 18 mounted on the output pulley shaft 12, an output shaft 20, an output shaft driven gear 19 mounted on the output shaft 20, an output shaft bearing a21 and an output shaft bearing b22 for supporting the output shaft 20, and an output flange 23 mounted at one end of the output shaft 20 to connect the generator rotor.

[0026] The power provided by the main engine is transmitted to the input shaft 2 through the input flange 1. Since the input shaft driving gear 5 and the input shaft driven gear 6 are meshed and paired for transmission, and the input shaft driven gear 6 is connected to the input pulley shaft 7, the power is transmitted to the input pulley shaft 7 through the gears. The input shaft driving gear 5 has a larger diameter than the input shaft driven gear 6, which realizes the function of increasing the speed and reducing the torque. Therefore, the torque of the power provided by the main engine to the input pulley shaft 7 is greatly reduced, and the speed is greatly increased, so that the torque reaches the reasonable and bearable requirements of the stepless speed regulation mechanism.

[0027] The power after continuous speed regulation by the stepless speed regulating mechanism is transmitted to the output shaft driving gear 18 through the output pulley shaft 12. Since the output shaft driving gear 18 and the output shaft driven gear 19 are meshed and paired for transmission, and the output shaft driven gear 19 is connected to the output shaft 20, the power is transmitted to the output shaft 20 through the gears. The output shaft 20 drives the generator to operate and generate electricity through the output flange 23. By setting a reasonable speed ratio between the output shaft driving gear 18 and the output shaft driven gear 19, the speed of the output shaft 20 is constant within the speed required by the generator, that is, the speed ratio of the output shaft driving gear 18 and the output shaft driven gear 19 can be a speed reduction or a speed increase. In this way, after the speed of the main engine changes, the engine speed will be constant after being adjusted by the main shaft driving constant speed generator device, and the voltage and frequency of the generator output will be constant. The requirements of the constant voltage and frequency of the shaft generator are achieved by mechanical means, which greatly improves the fuel utilization rate of the ship, and greatly reduces the cost of the shaft generator system and improves the reliability of the shaft generator system.

[0028] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A marine main shaft driven constant speed power generation device, characterized in that: The invention comprises a housing (24) and an input speed increasing mechanism, a stepless speed regulating mechanism and an output speed reducing mechanism arranged in the housing (24); the input speed increasing mechanism is connected to the main engine drive shaft of the ship via an input flange (1); the input speed increasing mechanism is connected to the stepless speed regulating mechanism via an input shaft driving gear (5) and an input shaft driven gear (6); the stepless speed regulating mechanism is connected to the output speed reducing mechanism via an output shaft driving gear (18) and an output shaft driven gear (19); and the output speed reducing mechanism is connected to the rotor of the ship generator via an output flange (23); The stepless speed regulating mechanism comprises an input pulley shaft assembly, a transmission belt (17) and an output pulley shaft assembly; The input pulley shaft assembly comprises an input pulley shaft (7) rotatably connected to a housing (24), the input pulley shaft (7) being provided with an input pulley fixed cone disk, an input pulley movable cone disk (8) axially movably connected thereto, and an input pulley piston (9) driving the input pulley movable cone disk (8) to axially move; The output pulley shaft assembly comprises an output pulley shaft (12) rotatably connected to a housing (24), the output pulley shaft (12) being provided with an output pulley fixed cone disk, an output pulley movable cone disk (13) axially movably connected thereto, and an output pulley piston (14) driving the output pulley movable cone disk (13) to axially move; The side surfaces of the transmission belt (17) respectively cooperate with the side surfaces of the input pulley fixed cone disk and the input pulley movable cone disk (8) on the input pulley shaft assembly, and the side surfaces of the transmission belt (17) also respectively cooperate with the side surfaces of the output pulley fixed cone disk and the output pulley movable cone disk (13) on the output pulley shaft assembly; The input pulley fixed cone disk (71) on the input pulley shaft (7) of the stepless speed regulating mechanism and the cone disks on the input pulley movable cone disk (8) are symmetrically formed at a certain angle, and the angles of the two side surfaces of the transmission belt (17) are the same as the angles of the cone disks, and the two side surfaces of the transmission belt (17) match the two side surfaces of the input pulley fixed cone disk (71) and the input pulley movable cone disk (8).

2. The main shaft driven constant speed power generation device according to claim 1, characterized in that: The input speed-up mechanism comprises an input shaft (2) rotatably connected to a housing (24), an input shaft driving gear (5) and an input shaft driven gear (6); the input shaft driving gear (5) is connected to the input shaft (2) via a key or is integral with the input shaft (2); the input shaft driven gear (5) is connected to the input pulley shaft (7) via a key or is integral with the input pulley shaft (7); the input shaft driving gear (5) and the input shaft driven gear (6) are meshed for transmission; and the diameter of the input shaft driving gear (5) is larger than that of the input shaft driven gear (6).

3. The main shaft driven constant speed power generation device according to claim 1, characterized in that: The output reduction mechanism comprises an output shaft (20) rotatably connected to a housing (24), an output shaft driving gear (18) and an output shaft driven gear (19); the output shaft driving gear (18) is connected to an output pulley shaft (12) via a key or is integral with the output pulley shaft (12); the output shaft driven gear (18) is connected to an output shaft (20) via a key or is integral with the output shaft (20); the output shaft driving gear (18) and the output shaft driven gear (19) are meshed for transmission.

Images