Large piston-reciprocating low-speed engine

An engine and piston technology, applied in the field of high-power piston reciprocating low-speed engines, can solve the problems of manufacturing, installation, maintenance and repair difficulties, increase the cost of engine manufacturing and use, occupy equipment load and installation space, and save manufacturing and maintenance The cost of repair, the difficulty of overcoming manufacturing and assembly, and the effect of reducing equipment load and installation space

Inactive Publication Date: 2018-02-23
肖光宇
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The large-scale high-power piston reciprocating low-speed engine (hereinafter referred to as "comparison engine") used by large-scale ships, in order to directly drive the propeller with high power and low speed, adopts the technical solution of large cylinder diameter and super long piston stroke of the traditional concept to realize its function. requirements; such as the R1e×96c engine, which is 27.3 meters long, 13.5 meters high, and has an overall weight of 2,300 tons. Such a huge volume not only consumes a lot of expensive manufacturing materials, but also brings great challenges to manufacturing, installation and maintenance. The difficulty increases the cost of engine manufacturing and use, and also takes up the bearing and installation space of the equipment accordingly
Only a very small number of countries in the world today can produce such large low-speed engines, which are far from meeting the requirements of social development

Method used

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specific Embodiment approach 1

[0028] figure 1 Show: the left and right sides of this design are parallel and vertically parallel to the starting cylinder of two L-type engines in a row, and its piston (6, 6 ') diameter is the same as that of the comparison engine ( Figure 5Shown) the diameter of the piston (10) is the same, and the piston stroke is slightly larger than 1 / 3 of the piston stroke of the engine; The rotational speed is 1 / 3 of the nominal rotational speed of the two crankshafts), that is, the reciprocating frequency of the pistons is 3 times the reciprocating frequency of the pistons of the comparison engine; therefore figure 1 Shows the nominal power vs. Figure 5 The nominal power per cylinder of the comparison engine shown is the same.

[0029] Figure 4 Engine single cylinder shown: diameter and stroke S of its piston (6) 1 and figure 1 If the single cylinders in the parallel twin cylinders shown are the same, the volumes of the two single cylinders are also the same; Figure 4 and ...

specific Embodiment approach 2

[0032] The technical parameters described in the above embodiments are only examples, and the engine piston diameter, stroke, crankshaft nominal speed, output shaft The parameters such as the calibrated speed and the ratio of the diameter of the pitch circle of the crankshaft gear to the diameter of the pitch circle of the output shaft gear are modified. For example, changing the ratio of the diameter of the pitch circle of the crankshaft gear to the diameter of the pitch circle of the output shaft gear, so that the rated speed of the output shaft is greater than or lower than the rated speed of the comparison engine, so as to meet the requirement that the rated speed of the engine output is greater than or lower than the rated speed of the comparison engine; Change the piston diameter or stroke of the engine cylinder to meet the requirements of the rated power of the engine's single cylinder.

specific Embodiment approach 3

[0033] If it is difficult to have a suitable comparison engine for the designed engine, or when its technical parameters and operating parameters are quite different from the comparison engine, various technical parameters and operating parameters can be independently designed according to the technical scheme and principles of the present invention.

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Abstract

The invention discloses a high-power piston-reciprocating low-speed engine for large ships. The piston diameter and the average speed of an existing large high-power piston-reciprocating low-speed engine (hereinafter referred to as a contrast engine) are kept basically unchanged, the rated rotating speed of crankshafts (1,3) is increased to be three times that of the contrast engine, and the piston travel is 1/3 of that of the contrast engine, so that the rated power of the engine is identical with that of the contrast engine, and the size of the engine is only 1/4 of that of the contrast engine; then the ratio of the crankshaft gear reference circle diameter to the output shaft gear reference circle diameter is set as 1:3, so that the rated rotating speed output by the engine is identicalwith that output by the contrast engine; after the engine has the unchanged functions but the smaller size, a lot of expensive steel materials are saved, the technical difficulty in manufacturing andmaintenance of large working components is overcome, a lot of manufacturing and maintenance costs are saved, the gravity center of the engine is lowered, and the working performance is more excellent.

Description

technical field [0001] The invention belongs to the field of internal combustion engines, in particular to a high-power piston reciprocating low-speed engine used in large ships. Background technique [0002] The large-scale high-power piston reciprocating low-speed engine (hereinafter referred to as "comparison engine") used by large-scale ships, in order to directly drive the propeller with high power and low speed, adopts the technical solution of large cylinder diameter and super long piston stroke of the traditional concept to realize its function. requirements; such as the R1e×96c engine, which is 27.3 meters long, 13.5 meters high, and has an overall weight of 2,300 tons. Such a huge volume not only consumes a lot of expensive manufacturing materials, but also brings great challenges to manufacturing, installation and maintenance. The difficulty increases the cost of engine manufacturing and use, and also correspondingly occupies the bearing and installation space of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B75/18F02B61/06
CPCF02B61/06F02B75/18F02B2075/1808
Inventor 肖光宇
Owner 肖光宇
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