A thrust transmission device for a ship shafting

Abstract

The present invention provides a thrust transmission device for a ship shafting system, which includes a ahead thrust transmission airbag, an astern thrust transmission airbag, an intelligent inflation and deflation controller, a central controller, a signal cable, an inflation and deflation pipeline, a main air supply pipeline, a pressure reducing valve and a high-pressure nitrogen cylinder. The intelligent inflation and deflation controller is internally provided with a solenoid valve; the ahead thrust transmission airbag is connected to the central controller through the inflation and deflation pipeline, and an intelligent inflation and deflation controller is arranged on the connecting pipeline of each ahead thrust transmission airbag; the astern thrust transmission airbag is connected to the central controller through the inflation and deflation pipeline, and an intelligent inflation and deflation controller is arranged on the connecting pipeline of each astern thrust transmission airbag; the central controller is connected to the high-pressure nitrogen cylinder through the main air supply pipeline, and the pressure reducing valve is installed on the main air supply pipeline; the central controller is used to control the inflation and deflation of the ahead / astern thrust transmission airbag. The present invention ensures the safe and stable operation of the vibration isolation device on the ship thrust bearing, and at the same time realizes good vibration isolation.

Description

Technical Field

[0001] The present invention relates to a thrust transmission device for a ship shafting, belonging to the technical fields of ship vibration reduction, vibration isolation and thrust transmission. Background Art

[0002] The structural sound radiation of a ship excited by the ship propulsion shafting has an important impact on the overall noise level of the ship. For an electric propulsion system, analysis shows that the radiation noise contribution caused by shafting equipment such as thrust bearings and stern bearings is much greater than the mechanical noise caused by the propulsion motor itself. Therefore, vibration isolation design for propulsion shafting equipment, especially thrust bearings, has become an important direction for shafting vibration reduction and noise reduction.

[0003] After a vibration isolation device is adopted for the thrust bearing for vibration isolation, compared with traditional vibration isolation devices, the thrust bearing vibration isolation device not only bears the self-weight load of the device and the equipment thereon, but also bears the shafting thrust (reverse thrust) transmitted from the shafting to the vibration isolation device through the thrust bearing pedestal. Among them, the shafting thrust is a variable load, which changes with the propeller speed (working conditions and ship speed). During the acceleration or deceleration (changing working conditions, ahead or astern) of the ship, this variable load will cause dynamic displacement of the vibration isolation device, affecting the safe operation of the shafting. Therefore, a special shafting thrust transmission device needs to be provided to automatically balance the shafting thrust transmitted from the shafting to the vibration isolation device through the thrust bearing. Summary of the Invention

[0004] In view of this, the present invention provides a thrust transmission device for a ship shafting, which solves the problem of real-time adaptive balance of the shafting thrust transmitted to the vibration isolation device through the shafting during different working condition switches of the ship, effectively controls the unsteady force during large thrust transmission of the shafting, ensures the safe and stable operation of the vibration isolation device on the ship thrust bearing, and at the same time achieves good vibration isolation.

[0005] The technical solution of the present invention is realized as follows:

[0006] A thrust transmission device for a ship shafting includes a ahead-thrust transmission airbag, an astern-thrust transmission airbag, an intelligent air charging and discharging controller, a central controller, a signal cable, an air charging and discharging pipeline, a main air supply pipeline, a pressure reducing valve and a high-pressure nitrogen cylinder. The intelligent air charging and discharging controller is internally provided with a solenoid valve;

[0007] The ahead-thrust transmission airbag is connected to the central controller through the air charging and discharging pipeline, and an intelligent air charging and discharging controller is provided on the connecting pipeline of each ahead-thrust transmission airbag;

[0008] The astern-thrust transmission airbag is connected to the central controller through the air charging and discharging pipeline, and an intelligent air charging and discharging controller is provided on the connecting pipeline of each astern-thrust transmission airbag;

[0009] The central controller is connected to the high-pressure nitrogen cylinder through the main supply pipeline, and the pressure reducing valve is installed on the main supply pipeline;

[0010] The central controller is used to control the opening and closing of the solenoid valve in the intelligent charging and discharging controller through the signal cable according to the forward / reverse and rotational speed signals of the shafting, so as to realize the charging and discharging of the forward / reverse thrust transmission airbag.

[0011] Further, the thrust transmission device of the present invention is arranged between the front and rear ends of the vibration isolation device and the hull structure. Under the ahead running condition, the central controller controls the change of the air pressure in the ahead thrust transmission airbag according to the rotational speed signal, so that the vibration isolation device does not generate displacement under the action of the dynamic force of the shafting. Under the astern running condition, the central controller controls the change of the air pressure in the astern thrust transmission airbag according to the rotational speed signal, so that the vibration isolation device does not generate displacement under the action of the dynamic force of the shafting.

[0012] Further, the connection in the present invention is welded or connected by a threaded joint.

[0013] Further, the number of the ahead thrust transmission airbags in the present invention is at least two, and the resultant force of the airbags is coaxial with the shafting thrust; the number of the astern thrust transmission airbags is at least two, and the resultant force of the airbags is coaxial with the shafting thrust.

[0014] Further, the number of the ahead thrust transmission airbags in the present invention is 4 719CYQN-2000 type airbags with a rated load-bearing capacity of 20kN, and the astern thrust transmission airbags are 4 719CYQN-2000 type airbags with a rated load-bearing capacity of 20kN.

[0015] Beneficial effects

[0016] In view of the characteristics that after the vibration isolation device is adopted for the thrust bearing in the present invention, the shafting thrust is large and it is a variable load transmitted through the vibration isolation device, by controlling the change of the air pressure in the forward / reverse thrust transmission airbag, the vibration isolation device does not generate displacement under the action of the dynamic force of the shafting, so as to solve the problems that after the vibration isolation device is adopted for the ship thrust bearing, the shafting thrust is large and it is a variable load, and solve the problems of real-time adaptive balance and transmission of the thrust transmitted to the vibration isolation device through the shafting thrust bearing at different ship speeds, and effectively control the unsteady force during the transmission of the large shafting thrust, ensure the safe and stable operation of the vibration isolation device behind the ship thrust bearing, and at the same time achieve good vibration isolation and efficient transmission of the shafting thrust from the vibration isolation device to the ship hull. Description of the drawings

[0017] Figure 1 It is a schematic diagram of the ship shafting thrust transmission device;

[0018] Figure 2 It is the working principle of the ship shafting thrust transmission device. Detailed implementation mode

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] As Figure 1 shown, the thrust transmission device of the ship shafting system in the embodiment of the present invention is arranged between the front and rear ends of the vibration isolation device and the hull structure, and mainly consists of a ahead thrust transmission airbag 01, an astern thrust transmission airbag 02, an intelligent air charging and discharging controller 03, a central controller 04, a signal cable 05, an air charging and discharging pipeline 06, a main air supply pipeline 07, a pressure reducing valve 08 and a high-pressure nitrogen cylinder 09. The intelligent air charging and discharging controller 03 is internally provided with a solenoid valve.

[0021] Internal connection mode of the device: The air charging and discharging pipeline interface of the ahead thrust transmission airbag 01 is connected to the central controller 04 through the air charging and discharging pipeline 06 (welding or threaded joint connection can be adopted), and an intelligent air charging and discharging controller 03 is provided on the connecting pipeline of each ahead thrust transmission airbag 01; the air charging and discharging pipeline interface of the astern thrust transmission airbag 02 is connected to the central controller 04 through the air charging and discharging pipeline 06, and an intelligent air charging and discharging controller 03 is provided on the connecting pipeline of each astern thrust transmission airbag 01 (welding or threaded joint connection can be adopted). The central controller 04 is connected to the high-pressure nitrogen cylinder 09 through the main air supply pipeline 06, and the pressure reducing valve 07 is installed on the main air supply pipeline 06 to convert the pressure in the high-pressure nitrogen cylinder 09 into the working pressure of the airbag; the central controller 04 is used to control the opening and closing of the solenoid valve in the intelligent air charging and discharging controller 03 through the signal cable 05 according to the ahead / astern and rotational speed signals of the shafting to realize the air charging and discharging of the airbag.

[0022] Interface and connection mode between the device and the outside: The central controller 04 of the device receives the ahead / astern and rotational speed signals of the shafting transmitted from the external system through the external signal cable as the input of the built-in control program in the central controller; the ahead thrust transmission airbag 01 and the astern thrust transmission airbag 02 are connected to the vibration isolation device at one end through bolts and to the hull structure at the other end; the intelligent air charging and discharging controller 03 and the central controller 04 are connected to the vibration isolation device through bolts, and the signal cable 05, the air charging and discharging pipeline 06 and the main air supply pipeline 07 are fixed to the vibration isolation device through pipe clamps and wire clips; the high-pressure nitrogen cylinder 09 is fixed to the hull structure through a hoop.

[0023] As a preferred solution, for the above-mentioned specific vibration isolation device, the number of ahead-thrust transmission air bags of the ship shafting thrust transmission device is 4 719CYQN-2000 type air bags with a rated load capacity of 20 kN, and the number of astern-thrust transmission air bags is 4 719CYQN-2000 type air bags with a rated load capacity of 20 kN. Their quantity and model can be adjusted, but it is necessary to ensure that the resultant force of the force-transmitting air bags is coaxial with the shafting thrust.

[0024] As a preferred solution, the thrust transmission air bags of the ship shafting thrust transmission device are arranged on both sides of the bow / stern end of the vibration isolation device, but are not limited to this arrangement method, and can also be arranged at the midship position of the bow / stern end.

[0025] As a preferred solution, the ship shafting thrust transmission device is used in cooperation with the thrust bearing vibration isolation device, but is not limited to this use, and can also be used in cooperation with other vibration isolation devices with thrust transmission.

[0026] The working process of the ship shafting thrust transmission device in the embodiment of the present invention will be described below:

[0027] During the navigation state, when the propeller rotates, it will be subjected to the force of the external fluid of the ship reacting on the propeller, which is the shafting thrust. As Figure 2 shown, it is set as F1. This force is transmitted to the thrust bearing through the shaft, and then transmitted to the thrust bearing vibration isolation device through the thrust bearing base, and then transmitted to the ship body through the vibration isolation device.

[0028] The shafting thrust is directly related to the ship's operating conditions. If no measures are taken, during the process of the ship switching operating conditions, because the vibration isolation device and the hull are elastically connected by shock absorbers, the ship shafting thrust will be transmitted to the hull structure connected thereto through the shock absorbers of the vibration isolation device. Due to the small stiffness of the shock absorbers, it will cause the vibration isolation device to generate large displacements (including axial displacements and deflection displacements). The shafting thrust F1 will cause large displacements of the vibration isolation device, and this displacement changes dynamically with the ship's speed, which has a great impact on the operating safety of the thrust bearing installed on the vibration isolation device and the vibration isolation effect of the vibration isolation device.

[0029] To ensure the stability of the vibration isolation device during the process of the ship accelerating (decelerating) and changing operating conditions such as ahead (astern), the embodiment of the present invention sets up a special shafting thrust transmission device. Considering setting up a set of shafting thrust transmission devices on the vibration isolation device, its working principle is as Figure 2As shown in the figure, thrust transfer airbags are respectively arranged at the front and rear of the vibration isolation device. The airbag at the front is used to transfer ahead thrust, and the airbag at the rear is used to transfer astern thrust. Under the ahead condition, the airbag at the front of the shafting thrust transfer device is inflated and generates an outward expansion force, designated as F2. By adjusting the air pressure inside the airbag, the stiffness of the airbag is changed, thereby changing its output force F2 to make F2 = F1, that is, it is equivalent to the shafting thrust being transferred to the hull foundation through the front thrust transfer airbag, so that the vibration isolation device does not generate displacement under the action of the shafting dynamic force, thus ensuring the stable attitude of the vibration isolation device.

[0030] Similarly, under the astern condition of the ship, the airbag at the rear of the shafting thrust transfer device is inflated and generates an outward expansion force, designated as F3. By adjusting the air pressure inside the airbag, the stiffness of the airbag is changed, thereby changing its output force F3 to make F3 = F1, that is, it is equivalent to the shafting thrust being transferred to the hull foundation through the rear thrust transfer airbag, so that the vibration isolation device does not generate displacement under the action of the shafting dynamic force, thus ensuring the stable attitude of the vibration isolation device.

[0031] Among them, the airbag charging and discharging control system of the device is used to monitor the attitude of the vibration isolation device, receive the ahead / astern and rotational speed signals of the shafting, and conduct airbag charging and discharging control.

[0032] In addition, the thrust transfer airbag is one of the main functional components of the ship shafting thrust transfer device, and it has an important characteristic: one end of it is connected to the vibration isolation device, and the other end is connected to the hull structure. Its stiffness is one order of magnitude lower than the stiffness of the vibration isolation device at the connection part and the hull stiffness, ensuring the good vibration isolation effect of the vibration isolation device.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit. Although the present patent has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that different types and numbers of thrust transfer airbags and corresponding layout schemes can be used as needed to implement it, that is, the technical solutions of the present patent can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present patent.

Claims

1. A thrust transmission device for a ship shafting system, characterized in that, it includes a ahead thrust transmission airbag (01), an astern thrust transmission airbag (02), an intelligent air charging and discharging controller (03), a central controller (04), a signal cable (05), an air charging and discharging pipeline (06), a main air supply pipeline (07), a pressure reducing valve (08) and a high-pressure nitrogen cylinder (09), and the intelligent air charging and discharging controller (03) is internally provided with a solenoid valve; the ahead thrust transmission airbag (01) is connected to the central controller (04) through the air charging and discharging pipeline (06), and an intelligent air charging and discharging controller (03) is provided on the connecting pipeline of each ahead thrust transmission airbag (01); the astern thrust transmission airbag (02) is connected to the central controller (04) through the air charging and discharging pipeline (06), and an intelligent air charging and discharging controller (03) is provided on the connecting pipeline of each astern thrust transmission airbag (01); the central controller (04) is connected to the high-pressure nitrogen cylinder (09) through the main air supply pipeline (06), and the pressure reducing valve (07) is installed on the main air supply pipeline (06); the central controller (04) is used to control the opening and closing of the solenoid valve in the intelligent air charging and discharging controller (03) through the signal cable (05) according to the ahead / astern and rotational speed signals of the shafting system to realize the air charging and discharging of the ahead / astern thrust transmission airbags; the central controller (04) receives the ahead / astern and rotational speed signals of the shafting system transmitted by an external system through an external signal cable as the input of the central controller; the thrust transmission device is arranged between the front and rear ends of the vibration isolation device and the hull structure. Under the ahead working condition, the central controller (04) controls the change of the air pressure in the ahead thrust transmission airbag (01) according to the rotational speed signal, so that the vibration isolation device does not generate displacement under the action of the dynamic force of the shafting system. Under the astern working condition, the central controller (04) controls the change of the air pressure in the astern thrust transmission airbag (02) according to the rotational speed signal, so that the vibration isolation device does not generate displacement under the action of the dynamic force of the shafting system.

2. The thrust transmission device for a ship shafting system according to claim 1, characterized in that, the connection is by welding or threaded joint connection.

3. The thrust transmission device for a ship shafting system according to claim 1, characterized in that, the number of the ahead thrust transmission airbags (01) is at least two, and the resultant force of the airbags is coaxial with the shafting thrust; the number of the astern thrust transmission airbags (02) is at least two, and the resultant force of the airbags is coaxial with the shafting thrust.

4. The thrust transmission device for a ship shafting system according to claim 1, characterized in that, the number of the ahead thrust transmission airbags (01) is 4 719CYQN-2000 type airbags with a rated load capacity of 20kN, and the astern thrust transmission airbags (02) are 4 719CYQN-2000 type airbags with a rated load capacity of 20kN.

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