KR101442251B1 - Vessel with electric motor - Google Patents

Abstract

The vessel of the present invention comprises:

- The hull,

- a shaft line (20) extended by a screw (22)

An electric propulsion motor (26) disposed in the hull (12) on the content crest (14) and adapted to drive the shaft line (20), the motor comprising a stator (34) integral with the hull , And a rotor (30) coupled with the shaft line (20)

A stator 42 integral with the hull 12 to transmit the axial force of the screw and the shaft line 20 to the hull; a rotor 40 disposed on the shaft line 20; And a thrust bearing 28,

that is:

- a common structure (50; 136) of the electric propulsion motor (26) for rigid connection of the motor (26) with the stator (34; 42) of the propulsion bearing (28)

Mechanical connection means (66, 68, 70) for connecting said common connection structure (50) to said hull (12).

Ship, hull, shaft line, electric motor, propulsion bearing, stator, rotor

Description

[0001] VESSEL WITH ELECTRIC MOTOR [0002]

The present invention relates to a ship,

- a hull,

A shaft line extending by a screw,

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 motor coupled to the shaft line,

A thrust bearing comprising a rotor disposed on said shaft line and a stator integral with said hull for transmitting an axial effort of said screw and said shaft line to said hull, , ≪ / RTI >

It is known that in vessels constituting submarine vessels such as miniature vessels or submarines floating on the surface of water, they bring their propulsive forces from motors, in particular from screws driven by electric motors. In order to transmit the axial thrust force of the screw to the contents crest or hull of the ship, a propulsion bearing is provided on the shaft line. The propulsion bearing includes a rotor attached to the shaft line and a stator rigidly connected to the hull of the ship, the rotor being axially supported with respect to the stator through sliding members having a low coefficient of friction.

In known ships, propulsion bearings constitute an essential element of drive. It is attached to the hull of the ship, for example by bolting or welding the base of the stator to the hull.

Further, the same shaft line is driven by the electric propulsion motor. The stator of the motor is also attached to the hull of the ship by bolting, in order to draw out the forces resulting from the rotation of the motor.

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

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

For this reason, the subject of the invention is, as a vessel of the aforementioned type,

A common structure of the electric propulsion motor for the robust connection of the stator of the motor and the propulsion bearing,

Mechanical connection means for connecting said 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 motor and the stator of the propulsion bearing are fixed along the axis of the shaft line;

The stator of the motor having an outer body with two opposing end walls along the axis of the shaft line, the stator of the propulsion bearing being fixed to the body along an end wall, Lt; / RTI > to form a connection structure that is common to the <

The stator of the propulsion bearing constitutes a removable casing which is at least partly connected to the body of the motor at least partially in a notch disposed along the axis of the shaft line and wherein the notch defined by the end wall, Lt; RTI ID = 0.0 > of < / RTI >

Wherein the motor is arranged on the shaft line between the screw and the propulsion bearing and the diameter of the rotation axis of the motor and the propulsion bearing on the propulsion bearing side for the motor is smaller than the diameter of the axis on the screw side small;

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

The connecting structure is connected to the hull by at least one resin block interposed between the connecting structure and the hull, and an axial supporting 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 thrust bearing has pads electrically isolated from the stator of the propulsion bearing of the propulsion bearing, the connecting means for connecting the propulsion bearing to the common structure lack electrical isolation;

The rotors of the motor and the propulsion bearing lack a intermediate connecting flange and include a common axis disposed between the two rotors; And

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

The present invention will become more apparent from the following description, given by way of example only and with reference to the drawings, in which: Fig.

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

A moveable rudder blade 18 is disposed on the stern of the hull. A shaft line (20) extends along the bottom surface (14) into the hull. It is extended to the outside of the hull by a propulsion screw (22) forward of the rudder blade (18). The shaft line 20 is supported by support bearings 24, which are arranged uniformly along their length and are rigidly connected to the bottom surface 14. The shaft line 20 is connected to the electric propulsion motor 26 and to the propeller bearing 28 which are both rotatably and axially rigid in the bottom surface 14 of the hull 12 . The electric motor 26 and the propulsion bearing 28 are provided with a movable protuberance disposed behind or below the hull, such as a propulsion pod generally designated as POD, But on the main part of the ship's body.

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. As shown in Fig. The rotor 30 is mounted so as to be relatively rotatable with a stator 34 constituting a fixed body of the motor. The rotor 30 and the stator 34 have windings 30A, 34A suitable for generating rotating fields and for rotationally driving the rotor.

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

The stator 42 has two parallel flanks 44A and 44B across which the shaft 43 is mounted and between which the rotor 40 is rotatably mounted. The two sides 44A, 44B are rigidly connected to each other by a base 45.

The side portions 44A and 44B are provided on the facing surfaces thereof with steel rollers such as sliding support runners 46 formed by ring portions or cylindrical portions distributed about the axis of the shaft 43 ). Each roller is coated with a tin gamma metal forming a layer or slip layer of an 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 rigidly connected by the same underframe (50) for connection to the hull. The lower frame forms a common structure for rigid connection of the stator (34, 42). For example, the stator (34) of the electric motor has a flange (52) for connection to the lower frame (50) in its periphery, the connection connecting the flange to the lower frame 54 or by bolting. Similarly, the base 45 of the propulsion bearing has a connecting flange 56 that is threaded or bolted to the lower frame 50, for example, by connecting members 58.

Radial guidance bearings are disposed on the shaft lines on each side of the electric propulsion motor 26. [ The bearings are generally formed by plain pillow bearings, but may also be, for example, ball or roller bearings. A first radial bearing 60 is disposed, 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 disposed 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 the shaft 43 and one of the sides 44B of the propulsion bearing. Alternatively, it may be disposed between one of the side portions 44A and the end of the shaft 43, or alternatively may be disposed between the stator 34 of the electric motor and the propelling bearing (not shown) when the propulsion bearing does not have a radial bearing 28) to the lower frame (50) Lt; / RTI > For electrical insulation reasons, the propulsion bearing is also disposed between the flange 32 and the rotor of the electric motor.

Preferably, the bottom of the vessel or the contents crest 14 is constituted by, for example, blocks welded to the contents crest, and between which the lower frame 50 of the electric motor has its opposite axial ends (Axial stop abutments) 66 that are supported on the base plate. For example, wedges 68 having opposing shapes are interposed between the lower frame 50 and the pedestals 66 to provide a secure axial support, Propulsion 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 content crest 14.

The lower frame 50 is seated on the regin blocks 70 interposed between the lower frame 50 and the contents crest 14 of the ship.

Preferably, the propulsion bearing 28 is disposed on the opposite side of the screw 22, relative to the electric propulsion motor 26. The shaft 43 therefore has an area of its own 43B across the propulsion bearing 28 in its region indicated as 43A across the electric motor 26, Lt; / RTI > In fact, in this preferred arrangement of the propeller bearing on the opposite side of the screw, torque is to be transferred from the rotor 30 to the screw, while torque from the rotor 30 to the propeller bearing, Should not be transmitted.

The motor and the propulsion bearing are fixed on the same lower frame 50 by the above arrangement of the electric propulsion motor 26 and the propulsion bearing 28 in the same integrated assembly, It will be appreciated that the space occupied by the bearings is reduced and that they are provided with the same means 66, 68, 70 for securing to the contents of the ship.

Since 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, (28) can be held on the hull by the resin blocks (70), thereby making it easy to fix the propulsion bearings. On the other hand, if the propulsion bearings are independent of the motor, they should be firmly connected to the hull 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 content bone and the shaft line while aboard the ship is omitted.

In electric propulsion motors, in order to avoid the circulation of the currents of the rotor to the bearings which cause electric corrosion of the bearings and cause damage to these bearings of the electric motor, the last bearing of the shaft line, The bearings of distant motors are electrically isolated.

The PTFE or equivalent runners 46 of the propeller bearing 28 are made of a non-insulated steel (not shown) from the casing 45, while allowing electrical insulation of the propulsion bearing 28 due to the substantial insulation properties of the PTFE material. To allow the propulsion bearings 28 to be firmly mechanically fixed to the motor, and electrical isolation of the propulsion bearings is provided by runners of the PTFE or equivalent.

Thus, this makes it possible to place the propulsion bearing on the electric propulsion motor farthest from the screw, with electrical isolation (PTFE or equivalent technology) of an integrated propulsion bearing that is easy to perform, To allow the casing of the propulsion bearing to be securely and securely fixed to the motor lower frame.

The fact that the propulsion bearings can be placed on the electric propulsion motors farthest from the screw without the drawbacks of electrical insulation and rigid mechanical fastening of the propulsion bearings, Place the bearings. This fact differs from the present solution in which the propulsion bearing is fixed to the contents crest of the vessel and is placed in the shaft line of the transmission of the torque between the electric propulsion motor and the screw.

This arrangement of the propulsion bearings integrated with the electric propulsion motor, in which no drive torque is exercised, makes it possible to reduce the diameter of the region 43B of the shaft compared to the region 43A of the shaft on which the drive torque must be transmitted, , Providing an opportunity to reduce the size and cost of propulsion bearings in propulsion shaft lines when it is integrated with an electric propulsion motor.

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

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

In the mode of the inventive embodiment, the propulsion bearing 128 includes a stator 152 that is connected to the motor lower frame by an intermediate support 154. The rotor of the propeller bearing is not shown, but is arranged relative to the stator, as in Fig.

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

The shape and construction of the support portion 154 may be adapted to avoid undesirable problems of vibration, including adjusting the rigidity of the support portion 154, particularly in the axial direction in which the propulsion of the screw is exerted. do.

The support portion 154 has flanges at its upper end 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 arranged on the same plane including the axis of rotation of the rotor of the propulsion bearing Are disposed at the ends of the supports.

The advantage of the removable and detachable support 154 is that it facilitates the passage of the rotor 130 for maintenance purposes because it is removable when problems of vibration occur during utilization of the vessel, (154) for another modified support. Modifying the detachable support 154 is faster and less expensive than modifying the structure of the vessel contents crest bearing the propulsion bearings when not integral with the propulsion bearing electric propulsion motor.

In the alternative embodiment shown in FIG. 4, the support 154 is omitted, which forms a one-piece with the stator 152 of the propulsion bearing. Thus, the stator 152 of the propeller 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 propeller bearing is in contact with the rotor And has a complementary shape to the notch 140 allowing passage. The lower frame of the motor thus has integrated support portions 175 that support the propulsion bearings and allow connection of the stator of the propulsion bearings at the apex of the propulsions with a horizontal plane which preferably includes the axis of the propulsion bearing . In the design phase, the struts 175 are also optimized to avoid any undesirable vibration problems.

In the embodiment of Figure 5, the support bearings 175 interposed between the propulsion bearings of Figure 4 and the lower frame of the motor are removable so that, when in use they are unsuitable as a result of undesirable vibration problems, Allow one substitution. Modifying the detachable feet 175 is faster and less expensive than modifying the structure of the vessel contents crest bearing the propulsion bearings when the propulsion bearings are not integrated with the electric propulsion motor.

In the embodiment of Figures 3-5, the lower frame 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 stator of the motor and the propulsion bearing.

The rests 155, 175 are provided with dimensions for avoiding, for example, harmful vibration phenomena when the vessel is in use. Thus, for example, the strength of the struts is defined to avoid any resonance of the propulsion shaft line, especially in the longitudinal direction. The strength of the fixing of the propulsion bearing is defined, for example, by adjustment of the thickness of the metal plates constituting the lower frame (supporting portion) and also by adjustment of the fixing height of the stator (supporting portion height) .

In the case of Figures 3 and 5, the struts are removable. They can be easily replaced in cases where the vibration behavior of the shaft line is unsatisfactory, which means that, in the event that the propulsion bearing is not integrated with the electric propulsion motor, It is faster and less costly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a longitudinal region of the aft end of a ship; FIG.

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

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

Figure 4 is a cross-sectional view showing an alternative embodiment of the motor of Figure 3 with a propelling bearing integrated with the motor;

Figure 5 is the same view of Figure 4 of an alternative embodiment of the motor of Figure 4;

Claims (11)

A hull 12; A shaft line (20) extended by a screw (22); And A stator 34 disposed in the hull 12 on the content crest 14 to drive the shaft line 20 and integral with the hull 12 and a rotor 34 coupled to the shaft line 20, An electric propulsion motor (26) including an electric motor (30); And A stator 42 integral with the hull 12 to transmit the axial force of the screw 22 and the shaft line 20 to the hull 12 and a shaft 42 connected to the shaft line 20, And a thrust bearing (28) including a rotor (40) disposed on the shaft A common structure (50; 136) of the electric propulsion motor (26) for connection of the motor (26) with the stator (34; 42; 152) of the propulsion bearing (28); And Mechanical connection means (66, 68, 70) for connecting the common connection structure (50) to the hull (12) 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 an end wall 138 and the body 134 defines a linkage structure common to the two stator 34, The stator (42) of the propeller bearing comprises a removable casing that is connected to the body of the motor, at least in part, at a notch (140) defined by the end wall (138) (10). The method according to claim 1, Characterized in that the structure is a lower frame (50) in which the motor (26) and the stator (34; 42; 152) of the propulsion bearing (28) are fixed along the axis of the shaft line (20). delete The method according to claim 1, Characterized in that the notch (140) has a larger cross-section than the cross-section of the rotor of the motor. The method according to any one of claims 1, 2, and 4, The motor (26) is disposed on the shaft line (20) between the screw (22) and the propulsion bearing (28) The diameter of the rotary shaft 43 of the motor 26 and the propeller bearing 28 on the side of the propeller bearing 28 relative to the motor 26 is determined by the diameter of the shaft 43 on the side of the screw 22, Characterized in that the vessel is smaller than the vessel. The method according to any one of claims 1, 2, and 4, The stator 42 of the propeller bearing 28 is provided with fastening means disposed on each side of the axis of the shaft line 20 on the same plane including the axis of the shaft 43 of the rotors 30, Is attached to the stator (34) of the motor (26) by means of a spring (160). The method according to any one of claims 1, 2, and 4, 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, Characterized in that an axial support pedestal (66) for supporting said connecting structure is provided on said hull (12). The method according to any one of claims 1, 2, and 4, Characterized in that the vessel 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, 2, and 4, The propulsion bearing 28 includes runners 46 that electrically isolate the rotor 40 of the propulsion bearing from the stator 42 of the propulsion bearing, Wherein the connecting means (56, 58) for connecting the propulsion bearing (28) to the common structure (50; 136) lack electrical isolation. The method according to any one of claims 1, 2, and 4, The motors 26 and the rotors 30 and 40 of the propeller bearing 28 include a common shaft 43 lacking intermediate coupling flanges and disposed between the two rotors 30 and 40 A ship characterized by. The method according to any one of claims 1, 2, and 4, The stator 42 of the motor includes a lower frame 136 and a lower frame 136 interposed between the lower frame 136 of the motor and the stator 152 of the propeller bearing 128 for supporting the propeller bearing 128 And a removable support portion (155).

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