A planetary speed regulating device for combined transmission of high-power mechanical and electric power for marine use

Abstract

A marine high-power mechanical and electric combined transmission planetary speed regulating device relates to the field of speed regulation. The purpose of the present invention is to solve the problems that the high-power variable frequency motor in the existing speed regulating device has low motor efficiency, low stability and low reliability when running in the low frequency range, and the existing speed regulating device is not suitable for high-power ships. The driving shaft of the generator set is connected to one end of the driving end coupling, and the other end of the driving end coupling is connected to the first input end of the differential planetary mechanism, the speed regulating end of the speed regulating mechanism is connected to the second input end of the differential planetary mechanism, and the output end of the differential planetary mechanism is connected to the propeller. The present invention is used for planetary speed regulation.

Description

Technical Field

[0001] The invention relates to the field of speed regulation and belongs to a speed regulation device. Background Art

[0002] Ship propulsion is mainly divided into mechanical and electric types. The transmission adopts the configuration drive mode of engine + transmission gearbox + propeller. Under this configuration condition, the working condition can only be switched by adjusting the engine, and the maneuverability is poor. Especially for medium and high-speed engines, the working condition is frequently switched, and the engine is in a non-rated speed state for a long time, which is not conducive to the performance of the engine and affects its life.

[0003] With the development of power electronics technology, research on ship electric propulsion systems is increasingly needed. The propulsion motor can be connected to the propeller shaft directly or through a gear transmission device. At present, most electric propulsion systems use propulsion motors to directly drive the propeller. Foreign countries started research on ship electric propulsion systems relatively early. In the early 1980s, with the advancement of various speed control and frequency conversion technologies, warship electric propulsion technology has made breakthrough progress. New surface ships, new icebreakers and destroyers all use comprehensive electric propulsion.

[0004] Although the direct connection between the motor and the propeller eliminates the need for a gear transmission device and has good maneuverability, this method has certain disadvantages: for high-power ships, in order to match the propeller speed, a low-speed, high-torque motor must be used, which makes it heavier. The spatial size of the inverter is closely related to its power level. For high-power inverter equipment, the layout space requirement is also large. In addition, when the propeller runs at a low speed, the variable-frequency motor also runs in the low-frequency range. At this time, the motor efficiency is low, the torque pulsation and current are large, and the motor may overheat, overcurrent, jitter, and increase in operating noise after long-term operation. The stability and reliability of the motor are low, and the maintenance and maintenance costs are high. This type of electric propulsion system and equipment has strict reliability requirements, especially for the motor.

[0005] The patent number is 202110958640.3, and the name is a mechatronic planetary speed control device with full-range speed regulation. It records that the input shaft of the inner gear ring is connected to the output shaft of the synchronous automatic clutch through a two-stage parallel shaft gear, and the planet carrier is connected to the variable frequency motor through a two-stage parallel shaft gear, in which the idler gear is connected to the clutch input shaft; the four-quadrant frequency converter drives the speed regulating motor, and the two-quadrant frequency converter and bypass switch drive the main drive motor. It is suitable for the field of industrial speed regulation drive, such as the drive of boiler feed pumps in power plants, compressor equipment in the petroleum, petrochemical and natural gas industries, etc., but not suitable for marine working conditions.

[0006] Ship Engineering, 2021, 43(02) Development and design of Changjing 7 full-electric drive target suction dredger Two sets of electric propulsion devices, including two variable frequency speed regulating propulsion motors with a rated power of 5000kW, two sets of high elastic couplings, two low noise gearboxes and two sets of adjustable propellers and shaft systems. This electric propulsion device has certain advantages for small power ships, but for large power ships, if variable frequency speed regulating propulsion motors are used, the volume of the inverter will be greatly increased and the cost will be higher. Summary of the invention

[0007] The purpose of the present invention is to solve the problems that the high-power variable-frequency motors in the existing speed regulating devices have low efficiency, low stability and low reliability when running in the low-frequency range, and the existing speed regulating devices are not suitable for high-power ships. A ship-based high-power mechanical and electric combined transmission planetary speed regulating device is proposed.

[0008] A marine high-power mechanical and electric power combined transmission planetary speed regulating device, the device comprising a generator set, a drive end coupling, a differential planetary mechanism, a speed regulating mechanism and a propeller;

[0009] The driving shaft of the generator set is connected to one end of the driving end coupling, the other end of the driving end coupling is connected to the first input end of the differential planetary mechanism, the speed regulating end of the speed regulating mechanism is connected to the second input end of the differential planetary mechanism, and the output end of the differential planetary mechanism is connected to the propeller.

[0010] Preferably, the differential planetary mechanism comprises a sun gear, planetary gears, a planetary carrier gear and an internal gear ring;

[0011] The other end of the drive end coupling is connected to the input end of the sun gear. A planetary gear is arranged between the sun gear and the inner gear ring, and the planetary gear meshes with the sun gear and the inner gear ring at the same time.

[0012] The planet carrier gear is sleeved on the rotating shaft of the planetary wheel, and the planet carrier gear is meshed with the speed regulating mechanism.

[0013] Preferably, the speed regulating mechanism comprises a speed regulating end gear, a speed regulating end coupling and a variable frequency speed regulating motor;

[0014] The planetary carrier gear is meshed with the speed regulating end gear, and the speed regulating end gear is connected to the variable frequency speed regulating motor through the speed regulating end coupling.

[0015] Preferably, the device further comprises a frequency converter;

[0016] The frequency converter is used to drive the variable frequency speed regulating motor.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a power type of combined transmission of high-power machinery and electricity for ships, which can be used as an alternative to the electric propulsion system. The low-speed high-power variable-frequency motor is replaced by a high-speed constant-speed generator set, and a low-power variable-frequency speed-regulating motor is used to connect another input. By changing the speed of the variable-frequency speed-regulating motor, the output speed of the speed-regulating differential planetary mechanism can be adjusted steplessly. While retaining the characteristics of electric propulsion, the problems of low motor efficiency, stability and reliability of high-power variable-frequency motors when running in the low-frequency range are avoided.

[0019] The invention can achieve 60% to 100% speed regulation, with high reliability, maneuverability and flexibility. Compared with the type in which the propulsion motor is directly connected to the propeller, it has the advantages of high power density, high efficiency, low cost, light weight, high reliability and stability.

[0020] The present invention adopts a high-speed industrial frequency motor (generator set) and a low-power variable frequency speed regulating motor to jointly control the differential planetary mechanism. Compared with the low-speed and high-torque variable frequency motor of full electric propulsion, the system space size and weight are better controlled.

[0021] In addition, the use of a small-power variable-frequency speed-regulating motor will greatly reduce the overall layout space and can be flexibly arranged at the shaft end of the planetary speed regulating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the principle of a planetary speed regulating device for combined transmission of high-power mechanical and electric power for ship use;

[0023] Figure 2 The schematic diagram is a principle block diagram of a planetary speed regulating device for combined transmission of high-power mechanical and electric power for marine use. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0027] Example:

[0028] Combination Figure 1 and 2This embodiment is described as a planetary speed regulating device for combined transmission of high-power machinery and electricity for use on a ship, the device comprising a driving main motor 1, a driving end coupling 2, a differential planetary mechanism 3, a speed regulating mechanism 4 and a propeller 5;

[0029] The driving shaft of the generator set 1 is connected to one end of the driving end coupling 2, the other end of the driving end coupling 2 is connected to the first input end of the differential planetary mechanism 3, the speed regulating mechanism 4 is connected to the second input end of the differential planetary mechanism 3, and the output end of the differential planetary mechanism 3 is connected to the propeller 5.

[0030] The differential planetary mechanism 3 is further defined as follows: the differential planetary mechanism 3 includes a sun gear 3-1, a planetary gear 3-2, a planetary carrier gear 3-4 and an inner ring gear 3-3;

[0031] The other end of the driving end coupling 2 is connected to the input end of the sun gear 3-1. A planetary gear 3-2 is arranged between the sun gear 3-1 and the inner gear ring 3-3, and the planetary gear 3-2 is meshed with the sun gear 3-1 and the inner gear ring 3-3 at the same time.

[0032] The planet carrier gear 3 - 4 is sleeved on the rotating shaft of the planetary gear 3 - 2 , and the planet carrier gear 3 - 4 is meshed with the speed regulating mechanism 4 .

[0033] Specifically, based on the speed regulation principle of the planetary variable frequency speed regulation device, a differential planetary gear structure is adopted. Since the device has high-speed input and low-speed output, the sun gear is selected as the constant speed input end, the planetary carrier gear as the speed regulation input end, and the inner ring gear as the speed change output end.

[0034] The device structure is further defined as follows: the speed regulating mechanism 4 includes a speed regulating end gear 4-1, a speed regulating end coupling 4-2 and a variable frequency speed regulating motor 4-3;

[0035] The planetary carrier gear 3-4 is meshed with the speed regulating end gear 4-1, and the speed regulating end gear 4-1 is connected to the variable frequency speed regulating motor 4-3 through the speed regulating end coupling 4-2.

[0036] The device structure is further defined as follows: the device further includes a frequency converter 6;

[0037] The frequency converter 6 is used to drive the variable frequency speed regulating motor 4-3 to work.

[0038] Specifically, the differential planetary mechanism 3 is of dual-input single-output form. The main motor 1 is driven by an industrial frequency motor connected to one input, and the auxiliary motor is driven by a small-power variable frequency motor connected to the other input. The inverter 6 drives the variable frequency motor speed to achieve stepless adjustment of the output speed. The output is the propeller shaft speed, achieving stepless speed regulation in the range of 60-100%.

[0039] A parallel stage can be added at the input end to match the speed of the high-speed industrial frequency motor generator set, and an idler wheel can also be added at the speed regulation end to achieve two-stage or multi-stage transmission to match the working conditions of the variable frequency speed regulation motor.

[0040] Working principle:

[0041] The device starts at zero speed and in the low-speed range: the generator set 1 is driven to increase its speed. The generator set 1 drives the sun gear 3-1 and the inner ring gear 3-3 to increase their speed synchronously through the drive-end coupling 2. The planetary carrier gear 3-4 is the speed regulating end. Since the variable frequency speed regulating motor 4-3 is not started, the speed regulating end of the device is in a free state and can be regarded as a constant speed ratio gearbox. The inner ring gear 3-3 is the power speed output end.

[0042] The device speeds up to the full speed range: when the generator set 1 continues to speed up to the rated operating condition, the variable frequency speed regulating motor 4-3 synchronously speeds up to the set speed, at which time the output speed is 100% of the operating condition. Thereafter, the generator set 1 is constant, and the variable frequency speed regulating motor 4-3 reduces the speed according to the curve to the output 60% operating condition, achieving stepless speed regulation in the range of 60-100%.

[0043] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A planetary speed regulating device for combined transmission of high-power machinery and electricity for marine use, characterized in that: The device comprises a generator set (1), a drive end coupling (2), a differential planetary mechanism (3), a speed regulating mechanism (4) and a propeller (5); The driving shaft of the generator set (1) is connected to one end of the driving end coupling (2), the other end of the driving end coupling (2) is connected to the first input end of the differential planetary mechanism (3), the speed regulating end of the speed regulating mechanism (4) is connected to the second input end of the differential planetary mechanism (3), and the output end of the differential planetary mechanism (3) is connected to the propeller (5).

2. A planetary speed regulating device for combined transmission of high-power machinery and electricity for ship use according to claim 1, characterized in that: The differential planetary mechanism (3) comprises a sun gear (3-1), planetary gears (3-2), a planetary carrier gear (3-4) and an inner ring gear (3-3); The other end of the driving end coupling (2) is connected to the input end of the sun gear (3-1), a planetary gear (3-2) is arranged between the sun gear (3-1) and the inner gear ring (3-3), and the planetary gear (3-2) is meshed with the sun gear (3-1) and the inner gear ring (3-3) at the same time. The planet carrier gear (3-4) is sleeved on the rotating shaft of the planetary gear (3-2), and the planet carrier gear (3-4) is meshed with the speed regulating mechanism (4).

3. A planetary speed regulating device for combined transmission of high-power machinery and electricity for ships according to claim 1, characterized in that: The speed regulating mechanism (4) comprises a speed regulating end gear (4-1), a speed regulating end coupling (4-2) and a variable frequency speed regulating motor (4-3); The planetary carrier gear (3-4) meshes with the speed regulating end gear (4-1), and the speed regulating end gear (4-1) is connected to the variable frequency speed regulating motor (4-3) via the speed regulating end coupling (4-2).

4. A planetary speed regulating device for combined transmission of high-power machinery and electricity for ships according to claim 3, characterized in that: The device also includes a frequency converter (6); The frequency converter (6) is used to drive the variable frequency speed regulating motor (4-3) to work.

Images