JP2013107609A - Electric water jet propeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To structure a motor water jet propeller, which can get thrust by pressurizing outside water, sucked in a jet waterway by an impeller rotated by a motor, and jetting this pressurized water, such that it can prevent the motor from being overheated and that it is excellent in maintenance.SOLUTION: It is equipped with a casing 1, which has a suction port 11, a discharge port 12, and a jet water way 13 leading to the discharge port from the suction port. A motor housing 2 is formed integrally in a casing in succession to a bulkhead 14 which constitutes the end face 14a on the suction side of the casing. A drive shaft 3 to be coupled with an impeller is inserted into the motor housing via the bulkhead, and a rotor 61 is provided in the section of the drive shaft existing in the motor housing and a stator 62 is provided in the motor housing to constitute a motor 6.

Description

  The present invention relates to an electric water jet propulsion machine for a water vehicle such as a ship or a water motorcycle, and more specifically, includes a casing having a suction port, a discharge port, and a jet water channel leading from the suction port to the discharge port, The present invention relates to an apparatus in which an impeller driven by an electric motor is provided in a jet water channel, external water sucked into the jet water channel is pressurized by the impeller, and thrust is obtained by injecting the pressurized water.

  An electric water jet propulsion device mounted on a hull such as a surface vehicle is known from Patent Document 1, for example. In this system, an engine room having a sealed structure is provided on the bottom of the ship, and an electric motor and a battery for supplying electric power to the electric motor are arranged in the engine room. Further, the hull is provided with a casing provided with a jet water channel that is adjacent to the engine room and extends from the ship bottom to the stern. An impeller that is rotationally driven by a drive shaft extending rearward from the electric motor is disposed in the jet water channel. When the impeller is rotationally driven in one direction by the electric motor, the water sucked from the bottom of the ship is pressurized through the jet water channel, and the pressurized water is jetted from the jet nozzle provided on the stern to the rear water. Thus, a propulsive force is obtained by the reaction, and the above-mentioned water vehicle propels forward on the water surface.

  Here, in the thing of the said patent document 1, the axial system containing the impeller of a water jet propulsion machine is pivotally supported by the casing of the water jet propulsion machine, and the electric motor is mounted in the ship bottom. In this case, because the hull is different in distortion generated on the bottom of the ship depending on whether it is elevated or moored, stationary or traveling, or temperature, the load applied to the bearing of the water jet propulsion unit connected to the electric motor increases.

  In addition, an electric motor tends to generate heat and become high temperature. For example, when a permanent magnet is used for a stator of an electric motor, thermal demagnetization occurs due to a temperature rise or a magnetic field of an energization current to the stator. When thermal demagnetization occurs in this way, the performance of the motor is reduced, so that the motor must be cooled during use. Therefore, it is known that a bearing case supported by the hull is arranged in the jet waterway, the motor is built in this bearing case, and the impeller is connected to the drive shaft (output shaft) supported by the bearing case. (See, for example, Patent Document 2, FIGS. 1 and 5). According to this, it is possible to prevent the rotor and the stator of the motor from being overheated by constantly exchanging heat through the bearing case with water flowing in the jet water channel.

  By the way, it is necessary to periodically replace parts such as a bearing for supporting the drive shaft, and it is necessary to disassemble and repair the electric motor when the electric motor fails. However, in the above conventional example, since the motor is built in the bearing case arranged in the jet waterway, for example, when parts are replaced or the motor is disassembled and repaired, the hull is lifted prior to these. However, it is necessary to remove the bearing case from the jet water channel and disassemble the bearing case, and it is necessary to reassemble the bearing case and return it to the jet water channel after parts replacement or disassembly repair. For this reason, much time is required for the replacement and disassembly repair of the motor, and the maintainability is remarkably poor.

JP-A-5-85471 JP 2002-362488 A

  In view of the above points, an object of the present invention is to provide an electric water jet propulsion device having good maintainability without impairing the function of preventing the motor from being overheated during use.

  In order to solve the above-described problems, the present invention includes a casing having a suction port, a discharge port, and a jet water channel leading from the suction port to the discharge port, and an impeller driven by an electric motor is provided in the jet water channel. In the electric water jet propulsion unit that pressurizes external water sucked into the jet water channel and injects the pressurized water to obtain thrust, the electric motor continuously with the partition wall that forms the end surface on the suction port side of the casing The housing is formed integrally with the casing, and a drive shaft connected to the impeller in the jet water channel is inserted into the motor housing through the partition wall, and a rotor is provided at the portion of the drive shaft existing in the motor housing. The motor is configured by providing a stator in the motor housing corresponding to the above.

  According to the present invention, when the impeller is driven to rotate, the motor housing integrated with the partition wall of the casing is always cooled by heat exchange with water that is sequentially sucked into the jet water channel from the suction port. For this reason, it can prevent effectively that an electric motor is overheated. Further, if the electric motor housing is processed to be concentric with the portion where the shaft system of the water jet propulsion unit is disposed, the adjustment of the shaft core is easy and a large load is not applied to the bearing. And since the rotor was provided in the drive shaft inserted in the motor housing integral with the partition of the casing, and the stator was provided in the motor housing, it was set as the motor, Therefore Unlike the thing of the said prior art example, a motor housing The motor can be assembled or disassembled only on the side, and maintenance is extremely good.

  In this case, it is preferable that a bearing for supporting the drive shaft is provided on the motor housing side portion of the partition wall. Thereby, even if the electric motor is disassembled, the shaft system of the water jet propulsion device can be fixed, and the centering adjustment after the electric motor is assembled is facilitated. Further, since the electric motor can be disassembled on the electric motor housing side, it is possible to exchange bearings from the inside of the hull, and there is no need to lift the hull.

  Further, in the present invention, when adopting a configuration in which the electric motor is a can structure and the inside of the electric motor housing is submerged, a forward water channel leading from the portion of the jet water channel on the downstream side of the impeller to the electric motor housing and a jet water channel on the upstream side of the impeller It is preferable to provide a condensate channel leading to the portion. According to this, water that is sequentially sucked into the jet water channel from the suction port circulates in the motor housing, which is advantageous in that the motor is further cooled.

  In this case, the forward water passage is formed so as to communicate from the end of the drive shaft existing in the jet water passage portion downstream of the impeller through the drive shaft to the motor housing, and the condensate passage is formed in the partition wall. Then, the structure which circulates in the motor housing can be realized without using separate parts.

1 is a side view of a ship on which a water jet propulsion device according to an embodiment of the present invention is mounted. 1 is a schematic cross-sectional view of a water jet propulsion device according to a first embodiment. The schematic cross section of the water jet propulsion machine concerning a 2nd embodiment. The schematic cross section of the water-jet propulsion apparatus which concerns on a modification. The schematic cross section of the water-jet propulsion apparatus which concerns on another modification.

  Hereinafter, a water jet propulsion device according to an embodiment of the present invention will be described with reference to the drawings, taking as an example the case of being mounted on a small vessel. Hereinafter, the traveling direction of the ship will be described as “front” and the opposite direction as “rear”.

Referring to FIGS. 1 and 2, WJ ₁ is a electric water jet propulsion unit of the first embodiment. Electric water jet propulsion unit WJ ₁ is mounted on the stern S2 of hull S1 of watercraft serving ship S, exits from the suction port 11 located in the vessel bottom S3 to the discharge port 12 positioned at the stern S2, the cross section A casing 1 that forms a letter-shaped jet water channel 13 is provided. The discharge port 12 is provided with an injection nozzle S4, and a traveling direction changing deflector S5 is connected to the injection nozzle S4. And the ship S is propelled by injecting the water pressurized with the impeller mentioned later toward the stern rear.

  A cylindrical motor housing 2 having an open front surface that extends continuously forward from a partition wall 14 constituting an end surface 14a extending in a direction orthogonal to the front-rear direction on the suction port 11 side of the casing 1 is formed integrally with the casing 1. ing. In this case, the casing 1 in which the electric motor housing 2 is integrated is formed of a material having good thermal conductivity such as aluminum and having corrosion resistance. A through hole 14b extending in the front-rear direction is formed in the partition wall 14, and a drive shaft 3 extending from the jet water channel 13 to the inside of the electric motor housing 2 is inserted into the through hole 14b. The drive shaft 3 is supported by an angular ball bearing (bearing) 4 provided on the electric motor housing 2 side portion of the partition wall 14.

  The angular ball bearing 4 is housed in a bearing case 41 having a flange 41a extending outward in the radial direction (vertical direction in FIG. 1), and fitted in the through hole 14b from the motor housing 2 side in this state. In this case, a step portion 14c in the front-rear direction (axial direction) is formed at the peripheral portion of the through hole 14b on the motor housing 2 side, and when the flange 41a is locked to the step portion 14c, the angular ball bearing 4 is moved back and forth. Positioned in the direction.

  In addition, after the angular ball bearing 4 is fitted into the through hole 14b via the bearing case 41, the annular retainer plate 42 that prevents the angular ball bearing 4 from coming off to the front side is parallel to the end face 14a. It is attached to the end surface 21. The partition wall 14 is detachably provided with a sealing mechanism 5 for water stop which is positioned behind the angular ball bearing 4. In addition, since a well-known thing can be utilized about the seal mechanism 5, detailed description is abbreviate | omitted here.

  A rotor 61 is extrapolated to the portion of the drive shaft 3 existing in the motor housing 2. A key groove 31 extending in the front-rear direction is formed in the portion of the drive shaft 3, and a key 61 a corresponding to the key groove 31 is formed on the inner surface of the rotor 61. When the key 61a is inserted into the key groove 31 from the front end side of the drive shaft 3 and the key 61a is locked at the rear end of the key groove 31, the rotor 61 is positioned in the front-rear direction and the drive shaft 3 is restricted in the rotational direction. Note that the longitudinal positioning of the rotor 61 with respect to the drive shaft 3 and the method of regulating the rotational direction are not limited to this, and other known methods can be used.

  Further, a stator 62 is provided on the inner surface of the motor housing 2 so as to correspond to the rotor 61, and the rotor 6 and the stator 62 constitute the motor 6. In this case, a step portion 22 in the front-rear direction (axial direction) is formed on the inner peripheral surface of the motor housing 2, and the stator 62 is inserted from the opening side of the motor housing 2 and is locked by the step portion 22. Then, it is positioned in the front-rear direction. Since the rotor 61 and the stator 62 are known ones in which a coil is wound around an iron core or a permanent magnet, detailed description thereof is omitted here. The electric motor can be an induction motor that does not use a magnet. For example, in order to energize the coil of the electric motor 6, a battery B and a control unit C including an inverter circuit for controlling the energization current are mounted in the hull S1. Then, after the electric motor 6 is assembled in the electric motor housing 2, a lid body 7 that closes the electric motor housing 2 is attached to the front end opening of the electric motor housing.

  In the first embodiment, the example in which the angular ball bearing 4 is provided on the partition wall 14 has been described as an example. However, the present invention is not limited to this. For example, a thrust bearing is provided on the partition wall 14 and the inner surface of the lid body 7 is provided. A radial bearing may be provided. Moreover, you may provide the angular ball bearing 4 in the partition 14 and the inner surface of the cover body 7, respectively.

  On the other hand, an impeller 8 is connected to a portion of the drive shaft 3 existing in the casing 1. When the impeller 8 is rotationally driven in one direction by the electric motor 6, external water sucked from the suction port 11 of the ship bottom S3 is pressurized through the jet water channel 13, and this pressurized water is provided in the stern S2. By being jetted from the jet nozzle S4 into the water behind, a propulsive force is obtained by the reaction and the ship S propels forward on the water surface.

  As described above, according to the first embodiment, when the impeller 8 is rotationally driven, it is integrated with the partition wall 14 of the casing 1 by heat exchange with water that is sequentially sucked into the jet water channel 13 from the suction port 11. The motor housing 2 is constantly cooled. For this reason, it can prevent effectively that the electric motor 6 is overheated. Further, since the motor housing 2 is processed to be concentric with the portion where the shaft system of the water jet propulsion unit is disposed, the adjustment of the shaft core is easy, and a large load is not applied to the angular ball bearing 4. And since the rotor 61 was provided in the part of the drive shaft 3 in the electric motor housing 2 integral with the partition 14 of the casing 1 and the stator 62 was provided in the electric motor housing 2, it was set as the electric motor 6, Therefore The said conventional example Unlike the above, the electric motor 6 can be assembled or disassembled from the hull S1 only on the electric motor housing 2 side, remarkably good maintainability, and the angular ball bearing 4 is provided as described above. If the electric motor 6 is disassembled on the electric motor housing 2 side, maintenance such as replacement of the angular ball bearing 4 from the hull S1 can be performed, and there is no need to mount the hull.

Next, a water jet propulsion device according to a second embodiment will be described. Referring to FIG. 3, WJ ₂ is the water jet propulsion device of the second embodiment. In the following, the same reference numerals are used for the same members or elements as those of the water jet propulsion machine WJ _{1 of the first} embodiment, and the same forms are used unless otherwise specified.

In the water jet propulsion machine WJ ₂ , the electric motor housing 2 is formed integrally with the casing 1 constituting the jet water channel 13 as described above. And the electric motor 60 provided in the electric motor housing 2 is comprised by the canned structure. That is, the outer surface of the rotor 610 that is extrapolated to the portion of the drive shaft 30 existing in the motor housing 2 is covered with a resin or metal can 630, and the outer surface of the stator 620 is also made of resin or metal. The can 630 is covered.

  Further, in the drive shaft 30, an outflow passage 91 is formed which leads from the rear end surface 30 a of the drive shaft 30 existing in the portion of the jet water passage 13 on the downstream side of the impeller 8 to the electric motor housing 2 through the drive shaft 30. Yes. In this case, a receiving recess 71 for receiving water from the water passage 91 is formed in the portion of the lid body 70 that faces the front end face 30 b of the drive shaft 30. Further, a condensate channel 92 is formed in the partition wall 14 so as to communicate with a portion of the jet water channel 13 on the upstream side of the impeller 8. Then, when the impeller 8 is driven to rotate, the pressure difference between the downstream side of the impeller 8 having a relatively high pressure and the upstream side having a relatively low pressure in the jet water passage 13, the inside of the jet water passage 13 in the outgoing water passage 91. Water is sucked in, the motor housing is submerged, and the water in the motor housing 2 is returned to the jet water channel 13 through the condensate channel 92.

  According to the above, water that is sequentially sucked into the jet water channel 13 from the suction port 11 without using a separate part circulates in the motor housing 2, which advantageously cools the motor 60 further. In addition, the structure which circulates the water in the motor housing 2 is not limited to the above, For example, a water passage is formed in the casing 1, or it communicates with the pipe line from the downstream side of the impeller 8 to the motor housing. Also good. Moreover, it is good also as a structure which external water circulates using a circulation pump by the side of an electric motor housing.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said each embodiment. In each of the above-described embodiments, the case where only the electric motors 6 and 60 are provided in the electric motor housing 2 has been described as an example. However, a predetermined rotation according to the ship on which the water jet propulsion devices WJ ₁ and WJ _{2 of} the present invention are mounted. In order to obtain torque, the speed reducer 100 may be provided in the motor housing 2.

  That is, as shown in FIG. 4, the motor housing 20 integrated with the casing 1 is formed with a through hole 20a through which the drive shaft 3 is inserted and a storage space 20b in which the motor 6 is stored. In this case, an output shaft 300 supported by the angular ball bearings 40 and 40 is disposed in the storage space 20b in parallel with the drive shaft 3 supported by the angular ball bearing 4 disposed in the through hole 20a. A rotor 61 is extrapolated to 300. In addition, an inner lid 701 and an outer lid 702 are sequentially attached to the front opening surface of the motor housing 20. The drive shaft 3 and the output shaft 300 are inserted into a space 703 defined by the inner lid 701 and the outer lid 702, and the number of teeth is different from each other in the drive shaft 3 and the output shaft 300 in the space 703. Spur gears G1 and G2 are respectively extrapolated.

  Here, if the motor housing 20 itself and the bearings 4 and 40 that support the drive shaft 3 and the output shaft 300 are not cooled, the gears G1 and G2 and the lubricating oil thereof are also heated, and the thermal expansion of the gears and the space 703 are performed. Although mechanical noise due to meshing of the gears may occur due to a change (decrease) in the viscosity of the lubricating oil inside, heat exchange with water that is sequentially sucked into the jet water channel 13 from the suction port 11 in the above modification. Thus, since the electric motor housing 20 integrated with the partition wall 14 of the casing 1 is always cooled, the occurrence of the above-described problems can be prevented.

  In addition, the structure of a reduction gear is not limited to the said modification, The thing using a rack and pinion etc., and a winding electric type can also be used. In the above modification, the drive shaft 3 and the output shaft 300 are described as being arranged in parallel. However, a coaxial reduction gear may be incorporated.

  That is, referring to FIG. 5, spaces 200 a and 200 b having different volumes in the front-rear direction are formed in the motor housing 200 integrated with the casing 1. A planetary gear mechanism PG is accommodated in the rear space 200a. The planetary gear mechanism PG meshes with the planetary gear PG2 and the carrier PG1 connected to the drive shaft 3 portion existing in the rear space 200a, the three planetary gears PG2 respectively supported by the carrier PG1, A sun gear PG3 connected to an output shaft 301 portion existing in the rear space 200a and a ring gear PG4 that meshes with the planetary gear PG2 and is fixed to an inner wall surface that defines the rear space 200a. And the rotor 61 is extrapolated to the output shaft 301 part which exists in the front side space 200b, and the stator 62 is provided on the inner wall surface which defines the front side space 200b corresponding to this, and the electric motor 6 is comprised. Is done. In any of the above modifications, if the motor 6 is disassembled on the side of the motor housings 20 and 200, it is advantageous that the bearings can be replaced from within the hull S1.

WJ ₁ , WJ ₂ ... water jet propulsion device, 1 ... casing, 11 ... suction port, 12 ... discharge port, 13 ... jet water channel, 14 ... partition wall, 14a ... end face, 2, 20, 200 ... motor housing, 3, 30 , 300 ... drive shaft, 4 ... angular ball bearing (bearing), 6, 60 ... electric motor, 61,610 ... rotor, 62,620 ... stator, 8 ... impeller, 91 ... outlet channel, 92 ... condensate channel.

Claims (4)

A casing having a suction port, a discharge port, and a jet water channel leading from the suction port to the discharge port is provided, and an impeller that is driven to rotate by an electric motor is provided in the jet water channel, and external water sucked into the jet water channel is added by the impeller. In an electric water jet propulsion machine that obtains thrust by injecting this pressurized water,
An electric motor housing is formed integrally with the casing continuously with the partition that forms the end surface on the suction port side of the casing, and a drive shaft connected to the impeller in the jet water channel is inserted into the electric motor housing through the partition. An electric water jet propulsion machine characterized in that a rotor is provided in a portion of a drive shaft existing therein, and a motor is configured by providing a stator in an electric motor housing corresponding to the rotor.   The electric water jet propulsion device according to claim 1, wherein a bearing for supporting the drive shaft is provided in a portion of the partition wall on the electric motor housing side. The electric water jet propulsion device according to claim 1 or 2, wherein the electric motor has a can structure and the electric motor housing is submerged.
An electric water jet propulsion device comprising: an outward water channel that leads from a jet water channel portion downstream of the impeller to a motor housing; and a condensate channel that leads to a jet water channel portion upstream of the impeller. The forward water passage is formed so as to communicate with the electric motor housing from the end of the drive shaft existing in the jet water passage portion on the downstream side of the impeller, and the condensate passage is formed in the partition wall. The electric water jet propulsion device according to claim 3.

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