KR20080069552A - Vessel with electric motor - Google Patents

Abstract

A vessel with an electric motor is provided to be inexpensive in comparison with a case that the contents of a ship to support a thrust bearing are amended when the thrust bearing is not integrated with an electric thrust motor. A vessel with an electric motor includes a ship body, a shaft line(20), an electric thrust motor(26), and a thrust bearing(28). The shaft line is extended by a screw. The electric thrust motor is arranged on the ship body and suitable for driving a shaft line. The electric thrust motor has a stator(42) and a rotor(40) arranged on the shaft line. The vessel further includes a common structure(50) and a plurality of mechanical connection units(66,68,70). The common structure stably connects the motor to the stators of the thrust bearing. The mechanical connection units connect the common connection structure to the ship body.

Description

Vessel with electric motor

The present invention relates to a ship,

The hull,

A shaft line extended by screws,

An electric propulsion motor disposed in the hull on a keelson and adapted to drive the shaft line, the motor comprising a stator integral with the hull, A rotor coupled to the shaft line, the motor comprising:

A thrust bearing comprising a rotor disposed on the shaft line and a stator integral with the hull for transmitting the axial effort of the screw and the shaft line to the hull. The present invention relates to a ship of a type including a water tank and a water tank.

In ships that make up subsea vessels, such as small vessels or submarines floating on the surface, it is known that their propulsion is derived from a motor, in particular a screw, which is rotationally driven by an electric motor. A propulsion bearing is provided on the shaft line to transmit the axial propulsion force of the screw to the vessel or hull of the vessel. The propulsion bearing comprises a rotor attached to the shaft line and a stator rigidly connected to the hull of the ship, the rotor being axially supported relative to the stator via sliding members having a low coefficient of friction.

In known ships, the propulsion bearing constitutes an essential member of the drive. It is attached to the ship's hull by, for example, bolting or welding the base of the stator to the hull.

The same shaft line is also driven by the electric propulsion motor. The stator of the motor is also attached to the ship's hull by bolting in order to derive the action forces resulting from the rotation of the motor.

The presence of the propulsion bearings and the electric propulsion motors formed along the axis of the shaft line in the hull of the ship results in a significant amount of volume and limits the space available on the hull.

It is an object of the present invention to provide a vessel in which the propulsion motor and the propulsion bearings are still provided, but the space available in the hull is increased.

For this reason, the subject of the present invention is a ship of the aforementioned type,

The common structure of the electric propulsion motor for a firm connection of the stator of the motor and the propulsion bearing,

A mechanical connection means for connecting the common connection structure to the hull.

According to certain modes of the embodiment, the vessel comprises one or more of the following features:

The structure is a lower frame in which the stators of the motor and the thrust bearing are fixed along the axis of the shaft line;

The stator of the motor has an outer body with two opposing end walls along the axis of the shaft line, the stator of the thrust bearing being fixed to the body along the end wall, the body of the two stator To form a connection structure common to the fields;

The stator of the propulsion bearing constitutes a removable casing rigidly connected to the body of the motor, at least partially in a notch disposed along the axis of the shaft line, the notch being a cross section larger than that of the rotor of the motor Has;

The motor is disposed on the shaft line between the screw and the propulsion bearing, and on the propulsion bearing side with respect to the motor, the diameter of the rotation shaft of the motor and the propulsion bearing is larger than the diameter of the shaft at the screw side. small;

The stator of the propulsion bearing is attached to the stator of the motor by fastening means disposed on each side of the shaft line of the shaft line on a substantially same plane including the axis of the rotor shafts;

The connecting structure is connected to the hull by at least one resin block interposed between the connecting structure and the hull, the axial support pedestal for supporting the connecting structure is provided on the hull;

The vessel has a single bearing for radial guidance of the shaft line between the rotor of the motor and the rotor of the propulsion bearing;

The propulsion bearing has pads that electrically insulate the rotor of the propulsion bearing from the stator of the propulsion bearing, and the connecting means for connecting the propulsion bearing to the common structure lack electrical insulation;

The rotors of the motor and the propulsion bearing, lacking an intermediate connecting flange, comprise a common shaft disposed between the two rotors; And

The stator of the motor comprises a lower frame and removable braces interposed between the lower frame of the motor and the stator of the propulsion bearing for supporting the propulsion bearing.

1 shows a longitudinal region of the stern end of a ship;

2 is an enlarged view of the propulsion bearing integrated with the propulsion motor of the ship of FIG. 1;

3 is a cross-sectional view of an alternative embodiment of a propulsion motor and a propulsion bearing integrated with an electric propulsion motor;

4 is a cross-sectional view showing an alternative embodiment of the motor of FIG. 3 with a propulsion bearing integrated with the motor;

5 is the same as that of FIG. 4 of an alternative embodiment of the motor of FIG.

The invention will become more apparent from the following description, which is provided by way of example only with reference to the drawings.

The ship of FIG. 1 is a ship floating on the water surface including a hull 12 having a bottom or keelson 14 and an aft end 16. As a variant, the vessel 10 is a submarine.

A movable rudder blade 18 is arranged at the stern of the hull. A shaft line 20 extends inside the hull along the bottom face 14. It extends out of the hull forward of the rudder blade 18 by a propulsion screw 22. The shaft line 20 is supported by support bearings 24 which are constantly arranged along their length and which are rigidly connected to the bottom face 14. The shaft line 20 is also connected to the electric propulsion motor 26 and to the propulsion bearing 28, both of which are firmly rotatable to the bottom face 14 of the hull 12 in the axial direction. Is connected. The electric motor 26 and the propulsion bearing 28 have movable protuberances disposed on or under the hull, such as a propulsion pod, generally designated POD, on the contents of the vessel. Not in the main part of the body of the ship.

As shown in FIG. 2, the electric propulsion motor 26 has a rotor 30 rigidly connected to the seating portion of the shaft line 20, for example by a flange 32. The rotor 30 is mounted to be relatively rotatable with the stator 34 constituting the fixed body of the motor. The rotor 30 and the stator 34 have windings 30A and 34A that are suitable for generating rotating fields and for rotating the rotor.

The propulsion bearing 28 comprises a rotor 40 which is constituted by a ring that forms a stop collar rigidly connected axially to the shaft line 20 and which is rotatable with the latter. . It includes a stator 42 forming a casing comprising the rotor 40. Each of the electric motors 26 and the rotors 30, 40 of the propulsion bearing 28 has a common axis of rotation 43 constituted by the axis of the electric propulsion motor. Thus, in general, the rotors have a one-piece structure and are formed of the same metal block without a flange or other connecting means between the motor and the propulsion bearing. As a variant, the rotor 40 is also added to the shaft 43 by hooping, thereby forming a common axis of rotation.

The stator 42 has two parallel flanks 44A and 44B between which the shaft 43 traverses and between which the rotor 40 is rotatably mounted. The two sides 44A, 44B are firmly connected to one another by a base 45.

The sides 44A, 44B are sliding support runners 46, formed on their opposite surfaces, with steel rollers, for example ring parts or cylinders distributed about the axis 43 of the axis 43. Has Each roller is covered with a tin gamma metal that forms a layer or slip layer of antifriction material such as PTFE or lead on its surface facing the rotor 40.

According to the invention, the stator 34 of the electric propulsion motor and the stator 42 of the propulsion bearing are supported and firmly connected by the same underframe 50 for connection to the hull. The lower frame forms a common structure for firm connection of the stators 34 and 42. For example, the stator 34 of the electric motor has, around itself, a flange 52 for connection to the lower frame 50, which connection connects the flange to the lower frame. By screwing or by bolting) Similarly, the base 45 of the propulsion bearing has a connecting flange 56 which is screwed or bolted to the lower frame 50, for example by means of connecting members 58.

Radial guidance bearings are arranged on the shaft line on each side of the electric propulsion motor 26. The bearings are generally formed by plain pillow bearings, but can also be ball or roller bearings, for example. The first radial bearing 60 is arranged, for example, between the flange 32 and the rotor of the electric motor. The bearing is generally supported directly by the lower frame 50.

A second single radial bearing 62 is arranged between the rotor 30 of the electric motor and the rotor 40 of the propulsion bearing. The bearing 62 provides a common radial guidance for the rotors 30, 40. It is preferably interposed between one of the sides 44B of the propulsion bearing and the shaft 43. As a variant, it may be disposed between one of the sides 44A and the end of the shaft 43, or if the propulsion bearing does not have a radial bearing, the stator 34 and the propulsion bearing of the electric motor ( 28) interposed between the lower frame 50 Is directly supported by For reasons of electrical insulation, the propulsion bearing is also arranged between the flange 32 and the rotor of the electric motor.

Preferably, the bottom or contents 14 of the vessel consist of, for example, blocks welded to the contents and between them the shaft ends of which the underframe 50 of the electric motor faces thereof. It has axial stop abutments 66 which are supported at. For example, wedges 68 having opposite shapes are interposed between the underframe 50 and the pedestals 66 to provide secure axial support, and that of the screw 22 A propulsion force is transmitted from the propulsion bearing 28 integrated with the electric propulsion motor 26 to the lower frame 50 and from the lower frame 50 of the electric motor to the internal bone 14.

Preferably, the lower frame 50 is seated on resin blocks 70 interposed between the inner bone 14 of the ship and the lower frame 50.

Preferably, the propulsion bearing 28 is disposed relative to the electric propulsion motor 26 on the opposite side of the screw 22. Thus, the shaft 43, as shown in FIG. 2, of its region 43B across the thrust bearing 28, in its region labeled 43A across the electric motor 26. Has a larger cross section than Indeed, in this preferred arrangement of the propulsion bearings on the opposite side of the screw, torque must be transmitted from the rotor 30 to the screw, while no torque from the rotor 30 to the propulsion bearing. It should not be delivered.

By means of the arrangement of the electric propulsion motor 26 and the propulsion bearing 28 in the same integrated assembly, the motor and the propulsion bearing are fixed on the same subframe 50, so that the motor and the propulsion It will be appreciated that the space occupied by the bearings is reduced and these are provided with the same means 66, 68, 70 for securing to the vessel of the ship.

In addition, the electric propulsion motor 26 together with the lower frame 50 has a weight and an installation area larger than the weight and the installation area of the propulsion bearing 28, and thus the motor 26 and the integrated propulsion bearings. An assembly composed of 28 can be held on the hull by the resin blocks 70, thereby facilitating the fixing of the propulsion bearing. In contrast, when the propulsion bearings are independent of the motor, they must be firmly connected to the hull, usually by screwing or welding.

When the propulsion bearing is integrated with the electric propulsion motor, the step of mounting and adjusting the propulsion bearing together with the inner valley and the shaft line in the state of aboard the ship is omitted.

Typically, in an electric propulsion motor, the last bearing of the shaft line, i.e., the screw, is most likely to avoid the circulation of currents in the rotor towards the bearings causing electrical corrosion of the bearings and damaging these bearings of the electric motor. The bearings of distant motors are electrically insulated.

Runners 46 made of PTFE or equivalent of the propelling bearing 28 are steel that is not insulated from the casing 45 while allowing electrical insulation of the propelling bearing 28 due to the substantial insulating properties of the PTFE material. Thereby permitting the propulsion bearing 28 to be rigidly mechanically fixed to the motor, wherein electrical insulation of the propulsion bearing is provided by runners of the PTFE or equivalent.

Thus, it is essentially insulated, with electrical insulation (PTFE or equivalent technology) of integrated propulsion bearings, which is easy to implement, making it possible to place the propulsion bearings on the electric propulsion motor furthest from the screw. Steel bolts, which do not allow steel bolts, to securely and securely secure the casing of the propulsion bearing to the motor underframe.

The fact that the propulsion bearings can be placed on the electric propulsion motor furthest from the screw without the drawbacks of electrical insulation and a firm mechanical fixation of the propulsion bearings provides the propulsion in areas where no drive torque is exerted. Place the bearing. This is different from the current solution in which the propulsion bearings are fixed to the vessel of the vessel and placed in the shaft line of transmission of torque between the electric propulsion motor and the screw.

The arrangement of the propulsion bearings integrated with the electric propulsion motor, in which the drive torque is not exerted, makes it possible to reduce the diameter of the area 43B of the axis as compared to the area 43A of the axis to which the drive torque is to be transmitted. , When it is integrated with an electric propulsion motor, offers the opportunity to reduce the size and cost of the propulsion bearings of the propulsion shaft line.

3 shows an alternative embodiment of a module integrating an electric propulsion motor and a propulsion bearing.

In this embodiment, the propulsion bearing is labeled 128 and the rotor of the motor is labeled 130. The body of the motor, designated 134, has a lower frame 136 that constitutes a support cradle for the rotor of the motor and for the propulsion bearing assembly. The lower frame includes a bottom plate 137 and two end walls 138. The wall 138 shown in FIG. 3 defines a notch 140 for the passage of the rotor 130 when a passage of the rotor 130 is required to disassemble and move the rotor out of the electric motor for maintenance reasons. do. The propulsion bearing 128 constitutes a casing connected to the body 134 of the motor, more precisely from the end wall 138 to the lower frame 136.

In the mode of the designed embodiment, the propulsion bearing 128 comprises a stator 152 connected to the motor subframe by an intermediate support 154. The rotor of the propulsion bearing is not shown, but is disposed relative to the stator, as in FIG.

The support 154 is generally U-shaped, defining two struts 155 to which a propulsion bearing is fixed between them. The support 154 includes flanges 156 for connection to the lower frame 136 by bolts or screws 158.

The shape and structure of the support 154 is adapted to avoid undesirable problems of vibration, including adjusting the rigidity of the support 154, in particular in the axial direction in which the propulsion of the screw is exerted. do.

The support 154 has, at its upper end, flanges for connecting the stator 152 of the propulsion bearing via bolts or screws 160. Preferably, the bolts 160 for connecting the stator 152 of the propulsion bearing to the support are on the same plane that includes the axis of rotation of the rotor of the propulsion bearing, as shown in FIG. 3. It is arranged at the ends of the bracing parts.

The advantage of the removable and removable support 154 facilitates the passage of the rotor 130 for maintenance purposes, since it is detachable if problems of vibration occur while utilizing the vessel, and also supports It is easy to change 154 for another modified support. Changing the detachable support 154 is faster and less expensive than modifying the structure of the vessel contents bearing supporting the propulsion bearing when it is not integrated with the propulsion bearing electric propulsion motor.

In the alternative embodiment shown in FIG. 4, the support 154 is omitted and the support forms a one-piece with the stator 152 of the propulsion bearing. Thus, the stator 152 of the propulsion bearing has a larger cross section than that of the rotor 130 of the electric propulsion motor, and more precisely, the stator 152 of the propulsion bearing has a lower cross section during the disassembly operation for maintenance. It has a shape complementary to the notch 140 that permits passage. Thus, the underframe of the motor has integrated braces 175 which support the propulsion bearings and allow the connection of the stator of the propulsion bearings at the apex of the props in a horizontal plane which preferably comprises the axis of the propulsion bearings. Have In the design phase, the bracing portions 175 are also optimized to avoid any undesirable vibration problems.

In the embodiment of FIG. 5, the support braces 175 interposed between the thrust bearing of FIG. 4 and the lower frame of the motor are removable, so that their ease in case of inadequacy as a result of undesirable vibration problems in use. Allow one replacement. Changing the removable braces 175 is faster and less expensive than modifying the structure of the vessel contents bearing supporting the propulsion bearings when the propulsion bearings are not integrated with the electric propulsion motor.

In the embodiment of FIGS. 3 to 5, the underframe 136 of the electric propulsion motor is attached to the hull of the ship by any suitable means and forms a common structure for the connection of the stators of the motor and the propulsion bearing.

The braces 155, 175 are provided with dimensions to avoid harmful vibration phenomena, for example when the ship is in use. Thus, for example, the strength of the bracing parts is defined to avoid any resonance of the propulsion shaft line, in particular in the longitudinal direction. The strength of the fixing of the propulsion bearing is defined, for example, by adjusting the thickness of the metal plates constituting the lower frame (brace) and also by adjusting the height of the stator fixing (height of the stator) relative to the propulsion bearing. Can be.

In the case of FIGS. 3 and 5, the braces are removable. They can be easily replaced if the vibratory behavior of the shaft line is not satisfactory, which is more than modifying the contents of the vessel supporting the propulsion bearings when the propulsion bearings are not integrated with the electric propulsion motor. Fast and less expensive

Claims (11)

Hull 12; A shaft line 20 extended by a screw 22; And A stator 34 disposed on the hull 12 on the inner bone 14 and adapted to drive the shaft line 20 and integral with the hull 12, and coupled to the shaft line 20. An electric propulsion motor 26 comprising a rotor 30; And Stator 42 and 152 integral with the hull 12 and the shaft line 20 to transfer the axial action force of the screw 22 and the shaft line 20 to the hull 12. And a propulsion bearing 28 comprising a rotor 40 disposed thereon. A common structure (50; 136) of the electric propulsion motor (26) for firm connection of the stator (34, 42; 152) of the motor (26) and the propulsion bearing (28); And And a mechanical connection means (66, 68, 70) for connecting the common connection structure (50) to the hull (12). The method of claim 1, The structure is characterized in that the motor (26) and the stator (34, 42; 152) of the propulsion bearing (28) is a lower frame (50), which is fixed along the axis of the shaft line (20). The method of claim 1, The stator 34 of the motor 26 has an outer body 134 having two opposing end walls 138 along the axis of the shaft line 20, The stator 152 of the propulsion bearing is fixed to the body 134 at the end wall 138, which body 136 forms a connection structure common to the two stators 34 and 42. Characterized by shipping. The method of claim 3, wherein The stator 42 of the propulsion bearing constitutes a removable casing rigidly connected to the body of the motor, at least partially in the notch 140 disposed along the axis of the shaft line, The notch (140) has a cross section larger than the cross section of the rotor of the motor. The method according to any one of claims 1 to 4, The motor 26 is disposed on the shaft line 20 between the screw 22 and the propulsion bearing 28, The diameter of the rotation shaft 43 of the motor 26 and the propulsion bearing 28 on the propulsion bearing 28 side relative to the motor 26 is the diameter of the shaft 43 on the screw 22 side. A vessel characterized by being smaller than. The method according to any one of claims 1 to 5, The stator 42 of the propulsion bearing 28 is fixed to each side of the axis of the shaft line 20 on the same plane substantially including the axis of the shaft 43 of the rotors 30, 40. By means (160) attached to the stator (34) of the motor (26). The method according to any one of claims 1 to 6, The connection structure 50 is connected to the hull 12 by at least one resin block 70 interposed between the connection structure 50 and the hull 12, An axial support pedestal (66) for supporting the connecting structure is provided on the hull (12). The method according to any one of claims 1 to 7, The vessel is characterized in that it comprises a single bearing (62) for radial guidance of the shaft line (20) between the rotor (30) of the motor and the rotor (40) of the propulsion bearing. The method according to any one of claims 1 to 8, The propulsion bearing 28 includes runners 46 which electrically insulate the rotor 40 of the propulsion bearing from the stator 42 of the propulsion bearing, The connecting means (56, 58) for connecting said propulsion bearing (28) to said common structure (50; 136) is characterized by a lack of electrical insulation. The method according to any one of claims 1 to 9, The rotors 30, 40 of the motor 26 and the propulsion bearing 28 comprise a common shaft 43, which lacks an intermediate connecting flange and is disposed between the two rotors 30, 40. Vessel characterized in that. The method according to any one of claims 1 to 10, The stator 42 of the motor is interposed between the lower frame 136 and the stator 152 of the propulsion bearing 128 and the lower frame 136 of the motor to support the propulsion bearing 128. A ship comprising removable braces (155).