阅读说明：本技术 一种船用柴油机减振装置 (Marine diesel vibration damper ) 是由 徐海东 李家淦 马强 王明雨 付振强 刘刚 张少君 苑仁民 于 2020-07-08 设计创作，主要内容包括：本发明涉及一种船用柴油机减振装置,其包括离心力装置、行星齿轮装置和调速控制装置,所述行星齿轮装置包括太阳轮、行星轮、行星架和齿圈,所述行星架与船用柴油机曲轴抗扭地相连,所述齿圈与所述调速控制装置相连,所述离心力装置设置在太阳轮上；所述调速控制装置调整齿圈的转速,以此能够使得即使柴油机转速很低的时候,也能够使离心力装置起到很好的减振效果；同时,能够根据柴油机的不同转速,通过调速控制装置来调整离心力装置的转速,使得离心力装置能够在不同的低速条件下都能够发挥很好的减振效果,大大提高了低速柴油机扭矩输出的稳定性和高可靠性。(The invention relates to a vibration damper of a marine diesel engine, which comprises a centrifugal force device, a planetary gear device and a speed regulation control device, wherein the planetary gear device comprises a sun gear, a planetary carrier and a gear ring; the speed regulation control device regulates the rotating speed of the gear ring, so that the centrifugal force device can play a good vibration damping effect even if the rotating speed of the diesel engine is very low; meanwhile, the rotating speed of the centrifugal force device can be adjusted through the speed adjusting control device according to different rotating speeds of the diesel engine, so that the centrifugal force device can play a good vibration reduction effect under different low-speed conditions, and the stability and the high reliability of torque output of the low-speed diesel engine are greatly improved.)

1. A vibration damper of a marine diesel engine comprises a centrifugal force device, a planetary gear device and a speed regulation control device, wherein the planetary gear device comprises a sun gear, a planet carrier and a gear ring, the planet gear is relatively rotatably arranged on the planet carrier, the sun gear is provided with external teeth, the gear ring is provided with external teeth and internal teeth, and the sun gear is in transmission connection with the gear ring through the planet gear; the planet carrier is connected with a crankshaft of the marine diesel in a torsion-resistant manner, the gear ring is connected with the speed regulation control device, and the centrifugal force device is arranged on the sun gear; the speed regulation control device comprises a controller, a speed regulation motor and a speed regulation gear, wherein the speed regulation motor is connected with the controller, the speed regulation gear is arranged on an output shaft of the speed regulation motor and coupled with the external teeth of the gear ring, and the controller regulates the rotating speed of the gear ring through the speed regulation motor; the centrifugal force device comprises a centrifugal mass and a roller, a first swing track is arranged on the centrifugal mass, a second swing track corresponding to the first swing track is arranged on the sun wheel, and the roller is arranged in the first swing track and the second swing track, so that the swing mass can swing relative to the sun wheel; the controller stores the torsional vibration characteristics of the marine diesel engine shaft system at different rotating speeds and the corresponding relation of matched rotating speeds of the centrifugal force device corresponding to the torsional vibration conditions at different rotating speeds;

the system also comprises a diesel engine crankshaft rotation speed sensor, a sun wheel rotation speed sensor and a gear ring rotation speed sensor, wherein the diesel engine crankshaft rotation speed sensor, the sun wheel rotation speed sensor and the gear ring rotation speed sensor are connected with the controller; the controller reads the crankshaft rotating speed of the diesel engine obtained by the crankshaft rotating speed sensor of the diesel engine and the sun wheel rotating speed obtained by the sun wheel rotating speed sensor, and the rotating speed of the sun wheel reaches the target rotating speed by adjusting the rotating speed of the gear ring according to the corresponding relation;

the rotating speed ratio of the crankshaft to the sun gear of the marine diesel engine is 1/1-1/25.

2. The vibration damper of marine diesel engine according to claim 1, wherein said speed-adjustable motor is a servo motor or a stepping motor.

3. The marine diesel engine vibration damping device of claim 2, wherein the variable speed motor is capable of bi-directional rotation.

4. The vibration damping device for the marine diesel engine according to claim 2, wherein the speed regulating motor has a locking function.

5. The vibration damper of marine diesel engine according to claim 1, characterized in that the centrifugal force device comprises at least 2 centrifugal masses which are circumferentially equispaced.

6. The vibration damping device for a marine diesel engine according to claim 1, wherein the centrifugal force means is located radially outside the sun gear.

7. The vibration damping device for the marine diesel engine according to claim 1, characterized in that the number of the planetary wheels is 3-6.

8. The vibration damping device of a marine diesel engine according to claim 1, wherein the marine diesel engine crankshaft passes through a sun gear, and the sun gear is supported on an output shaft connected to the crankshaft through a bearing.

Technical Field

The present invention relates to a vibration damping device for a marine diesel engine, and more particularly, to a vibration damping device for a marine diesel engine having a centrifugal force device.

Background

With the rapid development of the ship industry in recent years, the content of NOx, SO2 and particulate matters emitted by power plants is further increased, and the requirement on the control of tail gas emission is more and more strict. The NOx, SO2 and particulate matters discharged into the air by the marine main engine cause great harm to human beings and the environment, relevant regulations are established by the international society, and the requirement on the pollutant emission of ships is higher and higher.

In order to meet the more severe emission requirements, the diesel engine can fully combust fuel by reducing the running rotating speed of the diesel engine, and the generation and the emission of pollutants are correspondingly reduced, so that the low-speed diesel engine is more and more widely applied to ships. And because the running rotating speed of the diesel engine is continuously reduced, a propeller with a larger diameter needs to be equipped, so that the rotational inertia of the power system is greatly increased, the torsional vibration of a power shafting of the whole ship is increased, and more marine low-speed diesel engines need to be equipped with torsional vibration dampers to reduce the torsional vibration, so that the stability of power output and the safety of navigation are improved.

In power machines, it is already known to provide a centrifugal force device in a power shaft system for damping torsional vibrations, the centrifugal force device comprising a centrifugal mass, a centrifugal mass carrier, the centrifugal mass being arranged in the centrifugal mass carrier and being capable of oscillating relative to the centrifugal mass carrier, so as to damp torsional vibrations in the shaft system and improve the smoothness of the torque transmitted in the shaft system. However, the vibration reduction of the centrifugal force device is performed by the centrifugal force generated by the centrifugal mass, and the centrifugal force device requires a certain rotating speed for the centrifugal mass to overcome the self gravity by the action of the centrifugal force, so that the centrifugal mass acts on the centrifugal mass bearing member by the centrifugal force. However, the rotating speed of the existing marine low-speed diesel engine is very low, generally 300r/min, and most of the rotating speed is below 200r/min, so that when the centrifugal force device is applied to the marine low-speed diesel engine, the generated centrifugal force is small, and accordingly, the generated centrifugal force vibration reduction effect is weak. Meanwhile, the conventional centrifugal device does not have an active adjustment function, and has little capability of adapting to a rotation speed interval, and only a centrifugal device can be provided separately for a specific rotation speed interval. This greatly limits the application of centrifugal force devices to marine diesel engines.

In view of the above problems, there is a constant effort in the art to improve centrifugal force devices that are well adapted to ships.

Disclosure of Invention

In order to solve the technical problem, the invention provides a vibration damper of a marine diesel engine, which comprises a centrifugal force device, a planetary gear device and a speed regulation control device, wherein the planetary gear device comprises a sun gear, a planet carrier and a gear ring, the planet gear is relatively rotatably arranged on the planet carrier, the sun gear is provided with external teeth, the gear ring is provided with external teeth and internal teeth, and the sun gear is in transmission connection with the gear ring through the planet gear; the planet carrier is connected with a crankshaft of the marine diesel in a torsion-resistant manner, the gear ring is connected with the speed regulation control device, and the centrifugal force device is arranged on the sun gear; the speed regulation control device comprises a controller, a speed regulation motor and a speed regulation gear, wherein the speed regulation motor is connected with the controller, the speed regulation gear is arranged on an output shaft of the speed regulation motor and coupled with the external teeth of the gear ring, and the controller regulates the rotating speed of the gear ring through the speed regulation motor; the centrifugal force device comprises a centrifugal mass and a roller, a first swing track is arranged on the centrifugal mass, a second swing track corresponding to the first swing track is arranged on the sun wheel, and the roller is arranged in the first swing track and the second swing track, so that the swing mass can swing relative to the sun wheel;

the rotating speed ratio of the crankshaft to the sun gear of the marine diesel engine is 1/1-1/25.

The controller is connected with the crankshaft speed sensor of the diesel engine, the sun wheel speed sensor and the gear ring speed sensor.

Further, the controller stores the torsional vibration characteristics of the marine diesel engine shaft system at different rotating speeds and the corresponding relation of the matching rotating speeds of the centrifugal force device corresponding to the torsional vibration conditions at different rotating speeds; the controller reads the crankshaft rotating speed of the diesel engine obtained by the crankshaft rotating speed sensor of the diesel engine and the sun wheel rotating speed obtained by the sun wheel rotating speed sensor, and the rotating speed of the sun wheel reaches the target rotating speed by adjusting the rotating speed of the gear ring according to the corresponding relation.

Further, the speed regulating motor is a servo motor or a stepping motor.

Further, the adjustable speed motor can rotate bidirectionally.

Further, the speed regulating motor has a locking function.

Further, the centrifugal force device is located radially outward of the sun gear.

Further, the centrifugal force device comprises at least 2 centrifugal masses which are uniformly distributed in the circumferential direction.

Furthermore, the number of the planet wheels is 3-5.

Further, the crankshaft of the marine diesel engine passes through a sun gear, and the sun gear is supported on an output shaft connected with the crankshaft through a bearing.

The implementation of the invention has the following beneficial effects: the vibration damping device of the marine diesel engine is applied to a low-speed diesel engine, so that a centrifugal force device can play a good vibration damping effect even if the rotating speed of the diesel engine is very low; meanwhile, the rotating speed of the centrifugal force device can be adjusted through the speed adjusting control device according to different rotating speeds of the diesel engine, so that the centrifugal force device can play a good vibration reduction effect under different low-speed conditions, and the stability and the high reliability of torque output of the low-speed diesel engine are greatly improved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural view of a vibration damping device for a marine diesel engine according to the present invention.

Wherein: 1. a crankshaft; 2. a sun gear; 3. a planet wheel; 4. a planet carrier; 5. a ring gear; 6. a centrifugal force device; 7. a speed regulating gear; 8. a speed-regulating motor; 9. a controller; 10. a diesel engine crankshaft speed sensor; 11. a sun gear rotational speed sensor; 12. a gear ring rotation speed sensor; 13. and a bearing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

As shown in fig. 1, the vibration damping device of the marine diesel engine according to the present invention is provided on an output shaft connected to a crankshaft 1 of the diesel engine, and includes a centrifugal force device 6, a planetary gear device, and a speed control device. The centrifugal force device 6 is used for damping torsional vibration in a shafting by utilizing the principle that the centrifugal force of the mass block reacts on a bearing of the centrifugal force device 6.

The planetary gear comprises a sun gear 2, planet gears 3, a planet carrier 4 and a ring gear 5, the planet carrier 4 being connected to the output shaft in a rotationally fixed manner, the ring gear 5 being coupled to the sun gear 2 via the planet gears 3. Wherein, include a plurality of planet wheel 3, at least 3, a plurality of planet wheel 3 are fixed each other through planet carrier 4, and planet wheel 3 is fixed in the one end of planet carrier 4 and can freely rotate relative to planet carrier 4, and the other end of planet carrier 4 is then antitorque with the output shaft continuous. The sun gear 2 is supported on the output shaft via a bearing 13. The gear ring 5 comprises inner teeth and outer teeth, and the inner teeth of the gear ring 5 are coupled with the planet wheel 3 and further can be coupled with the sun wheel 2; the outer teeth of the ring gear 5 are coupled to a speed control device.

The centrifugal force device 6 is fixed on the sun wheel 2, the centrifugal force device 6 comprises a plurality of centrifugal masses and a plurality of rollers, a first swing track is arranged on each centrifugal mass, a second swing track is correspondingly arranged on the sun wheel 2, the rollers are arranged in the first swing track and the second swing track in a penetrating mode, accordingly, the centrifugal masses are supported on the sun wheel 2, the centrifugal masses can swing relative to the sun wheel 2 along the first swing track and the second swing track, and the torsional vibration in the output shaft can be damped through the planet carrier 4, the planet wheel 3 and the sun wheel 2. For the connection mode of the centrifugal force device 6 and the sun wheel 2, the centrifugal force device 6 can be directly fixed on the sun wheel 2, namely the radius of the centrifugal force device 6 is smaller than the radial radius of the sun wheel 2; the centrifugal force device 6 may also be connected to the sun wheel 2 via an intermediate member such that the centrifugal force device 6 is located radially outside the sun wheel 2, which makes the damping effect of the centrifugal force device 6 even better.

Aiming at the problem that the swinging action of the centrifugal force device 6 is not obvious under the rotating speed caused by the excessively low rotating speed of the output shaft, the invention is provided with the speed regulation control device. The speed regulation control device comprises a controller 9, a speed regulation motor 8 and a speed regulation gear 7, wherein the speed regulation motor 8 is connected to the controller 9, the speed regulation gear 7 is fixed on an output shaft of the speed regulation motor 8, the speed regulation gear 7 is coupled with the external teeth of the gear ring 5, and the speed regulation motor 8 can regulate and control the rotating speed of the gear ring 5 in such a setting mode.

Specifically, assume that: the rotation speed of the sun gear 2 is S1, the rotation speed of the carrier 4 is S2, the rotation speed of the ring gear 5 is S3, and the gear ratio of the ring gear 5 to the sun gear 2 is w, then the rotation speed of the carrier 4 at the input side and the rotation speed of the sun gear 2 at the output side in the planetary gear device have the following relationship:

S1＝(1+w)*S2-w*S3。

therefore, the rotation speed ratio of the sun gear 2 to the carrier 4 can be adjusted and controlled by adjusting S3, that is, the rotation speed of the ring gear 5. Typically, the number of teeth of the ring gear 5 is much larger than the number of teeth of the sun gear 2. Of course, in order to meet the speed regulation requirement in practice, the number of teeth of the ring gear 5 and the number of teeth of the sun gear 2 may be set accordingly. In particular, in order to achieve a greater step-up ratio, the adjustable-speed motor 8 can rotate bidirectionally, i.e. can drive the ring gear 5 to rotate bidirectionally, and when the direction of rotation of the ring gear 5 is opposite to the direction of rotation of the sun gear 2, a very large step-up ratio can be achieved between the rotational speed of the carrier 4 and the rotational speed of the sun gear 2.

Preferably, the marine diesel engine has a crankshaft to carrier speed ratio of 1/1-1/25.

In order to accurately control the rotating speed and the direction of the ring gear 5, a diesel crankshaft rotating speed sensor 10, a sun gear rotating speed sensor 11 and a ring gear rotating speed sensor 12 are further included. The diesel engine crankshaft rotational speed sensor 10 is used for measuring the rotational speed of the diesel engine crankshaft 1, i.e., the rotational speed of the planet carrier 4, the sun gear rotational speed sensor 11 is used for measuring the rotational speed of the sun gear 2, i.e., the rotational speed of the centrifugal force device 6, and the ring gear rotational speed sensor 12 is used for accurately measuring the rotational speed of the ring gear 5.

A diesel engine crankshaft speed sensor 10, a sun gear speed sensor 11, and a ring gear speed sensor 12 are connected to the controller 9. Further, the controller 9 stores therein the torsional vibration characteristics of the marine diesel engine shaft system at different rotational speeds and the corresponding relationship of the matching rotational speeds that the centrifugal force device 6 should have in correspondence to the torsional vibration conditions at the different rotational speeds. In operation, when the controller 9 reads the rotation speed of the diesel crankshaft 1 obtained by the diesel crankshaft rotation speed sensor 10 and the rotation speed of the sun gear 2 obtained by the sun gear rotation speed sensor 11, the rotation speed of the sun gear 2 is adjusted to reach the corresponding target rotation speed by adjusting the rotation speed of the ring gear 5 according to the corresponding relationship.

Further, the speed regulating motor 8 is a servo motor or a stepping motor.

Further, the adjustable speed motor 8 has a locking function, that is, the adjustable speed motor 8 can lock the gear ring 5.

Further, the centrifugal force device 6 comprises at least 2 centrifugal masses which are uniformly distributed in the circumferential direction.

Further, the number of the planet wheels 3 is 3-6.

Further, the crankshaft 1 of the marine diesel engine passes through the sun gear 2, and the sun gear 2 is supported on an output shaft connected to the crankshaft 1 through a bearing 13.

The implementation of the invention has the following beneficial effects: the vibration damping device of the marine diesel engine is applied to a low-speed diesel engine, so that a centrifugal force device can play a good vibration damping effect even if the rotating speed of the diesel engine is very low; meanwhile, the rotating speed of the centrifugal force device can be adjusted through the speed adjusting control device according to different rotating speeds of the diesel engine, so that the centrifugal force device can play a good vibration reduction effect under different low-speed conditions, and the stability and the high reliability of torque output of the low-speed diesel engine are greatly improved.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.