JPS59123440A - Shaft generator transmitted by differential gear - Google Patents

Abstract

PURPOSE:To keep the generated frequency of a generator within a certain range by a method wherein a differential gear is provided to a driving system of a shaft generator driven directly by a main engine and the revolution of the generator is corrected according to the variation of the revolution of the main engine. CONSTITUTION:An acceleration gear 5 is put on a main shaft 2 of a diesel engine 1. The rotation of the gear 5 drives a synchronous generator 13 through a pinion gear 6, a sun gear 7, a plurality (usually three) of planet pinion gears 8, a ring gear 9 and a pinion gear 11. A differential gear is composed of the sun gear 7, the planet pinion gear 8 and the ring gear 9. An output of the synchronous generator 13 is rectified 15 and a DC motor 14 is driven. A pinion gear 12, attached to a shaft of the motor 14, is in gear with a planet pinion carrier 10, which rotates the planet pinion gear 8, and drives the differential gear part and corrects the variation of the frequency of the generator 13 caused by the variation of the revolution of the main shaft 2. With this constitution, the frequency of the generator is kept within a certain range easily.

Description

[Detailed Description of the Invention] In recent years, various measures have been taken on ships to reduce neck energy. For this reason, from the point of view of thermal efficiency, the prime movers of large ships are all now diesel engines, and these diesel engines directly drive the propeller shaft. A shaft power generator is a system in which a generator is driven directly from the propeller shaft. By doing this, compared to the Jiurai, which was driven by a small diesel engine dedicated to power generation, the large main engine has much better thermal efficiency, and also because it uses lower quality and cheaper heavy oil. , the cost of combustion for power generation is greatly reduced. As a result, this shaft power generation device is becoming increasingly adopted on many ships.

The problem in this case is issue Y13. The rotational speed of the machine is affected by the rotational speed of the propeller shaft, and when the rotational speed of the propeller shaft changes, the rotational speed of the generator changes accordingly, and the cycle of the generated alternating current changes. To eliminate this drawback, between the propeller shaft and the generator)! 1 [Modification i
The generator is designed to maintain constant rotation even if the rotation speed of the propeller shaft fluctuates.

Examples of the continuously variable transmission include a magnetic coupling, a multi-plate clutch, and a hydraulic transmission. Electrical methods include a method that uses an electric power generation source, and a method that uses a thyristor to convert the cycle of generated power into a constant cycle even if the cycle changes. The efficiency of these conversions is usually said to be 70-75% for mechanical types, and about 0% for electrical types.
It is called.

On the other hand, the point of filli rating is that electric type is generally cheaper. The efficiency of this conversion is an important value because even if the main engine is driven to save energy, if the efficiency of this part is poor, the final power generation efficiency will decrease and it will be meaningless.

The present invention aims to provide a yarn with higher efficiency and lower cost than conventional methods. This utilizes a differential gear, known as a sub-type, as part of the transmission path. The mold for this Suburi 1 is
The power transmission path is divided into two systems using differential gears, with most of the power being transmitted through the highly efficient gears, and only a small portion of the power being transmitted through the variable speed mechanism, which naturally results in improved transmission efficiency. The price is high. Efficiency of approximately f5% is expected, and the constant frequency type provides the highest efficiency. Prices are also reduced because most of the power is transmitted through inexpensive gears. However, because the influence of the transmission mechanism is small,
Volcano has a narrow shifting range. However, as in the present invention, it is appropriate in a case where a speed change of /-% is sufficient.

There are two ways to use these two power transmission systems: one in which there are two drives mIJKM on the input side, and the other in which there are two driven bodies on the output side.

The former drives a driven body by the sum of the rotational speeds of two types of drive sources. In this case, the first drive source is a propeller shaft, and the second drive HJI source is an rα flow motor.

When the rotational speed of the propeller shaft decreases, the corresponding increase in rotational speed due to the decrease is caused by direct current! In addition to the 1st edition, is it from? This second drive source is not necessarily limited to a DC motor, but may also be a variable hydraulic motor or the like.However, if the generated alternating current is
A DC motor that can be used immediately after rectifying the current (i') is q-effect.

The latter has one fM drive source and two driven bodies, with a synchronous generator serving as the first driven body and a +rI flow power generation unit 1 as the second driven body. Now, when the number of revolutions of the propeller shaft increases, the number of revolutions corresponding to the addition of η is applied to the DC power generation l to keep the number of revolutions of the synchronous generator constant. This case is more complicated than the former in that it requires a DC to AC converter, but the capacity of the synchronous generator is smaller. In this text, we will mainly explain using the former for departmental purposes.

Next, details will be explained with reference to the drawings. In FIG. 1, this is an overall system diagram of the present invention, and l is between diesel engines. 2 is a propeller shaft, and 3 is a propeller.

4 is the hull. Reference numeral 5 is an additional (output spring) attached to the propeller 11 and 2. Reference numeral 6 is a pinion gear that meshes with this. Reference numeral 7 is a sun gear driven by the pinion gear 6.

Reference numeral 8 denotes a pinion gear, which is usually set in groups of three. Reference numeral 9 denotes a ring gear that meshes with this gear. Together with the sun gear 7, these three types of gears form a differential gear. 10 is the branet 1 to pinion gear 8
It is a planet 1 to pinion gear rear that is attached and rotates, and at the same time serves as a supercarrier. A pinion gear 11 meshes with teeth cut on the outside of the link gear 9. 12 is a pinion gear that meshes with the planet pinion carrier 1°. 13 is a synchronous generator driven by the pinion gear 11. 14 is pinion gear 1
This is an iα flow motor that drives the motor. 15 is AC i1'
- This is a control device that incorporates a rectifier that replaces the T current and a speed change device for a DC motor. Although a DC motor is used in this explanation, it is also possible to use an AC variable speed electric motor using an iristor depending on the case. Reference numeral 16 denotes a brake device, which is similar to the disc brake of automatic Q1. When there is a failure in the DC motor system, this brake device is activated to fix the DC motor 14 and convert the shaft generator into a variable frequency type. As a result, it is a safety 'jA moss that can be used as emergency luck 11v1. 17 is D41 AC wiring, 18
■ α is the b wiring.

In other words, by the system shown in this figure, the 11゛f flow',
The n1 assistant gear 14 rotates the pinion gear 12, which rotates the propeller 1 snakeion carrier 10, causing the propeller 1-pinion carrier 8 to revolve and increasing the rotation of the link carrier 9. By the principle of the 59 moving gear, the propeller is Even if the rotational speed of the shaft 2 decreases, the rotational speed of the synchronous generator 13 is kept constant, thereby preventing changes in the cycle of the generated alternating current electricity.

[Brief explanation of the drawing]

Claims (1)

[Claims] In a shaft power generation system in which a generator is directly driven by a diesel main engine for driving a ship's propeller, a differential gear is provided in the drive system, and the fli1 shift of the correction system is adjusted according to fluctuations in the rotational speed of the main engine. Shaft power generator with variable speed via differential gears, with additional drive for adjusting the number of gears.