KR102108435B1 - Motor unit including circulating channel of lubricating agent - Google Patents

Abstract

The motor unit is started. The motor unit is formed with a motor cavity, a rotating shaft therein, a bearing part rotatably supporting the rotating shaft, a rotor fixed to the rotating shaft, a stator with a coil spaced apart from the rotor, and the rotating shaft A motor cavity frame in which circulating impellers fastened and rotated at one end are respectively disposed; And a cooling frame accommodating the motor cavity frame therein and provided with a cooling channel between the motor cavity frame, and a lubricant filled airtightly inside the motor cavity frame and the cooling frame is rotated along the rotation axis. The circulating impeller is characterized in that the lubricating medium circulation path flowing through the bearing part, the stator, and the cooling channel sequentially and then flowing back into the circulating impeller is formed.

Description

Motor unit with lubricating medium circulation path formed {MOTOR UNIT INCLUDING CIRCULATING CHANNEL OF LUBRICATING AGENT}

The present invention relates to a technique for mining deep-sea mineral resources, and more particularly, to a motor used in a mining apparatus for transmitting mineral resources collected from the seabed to the sea.

In the deep sea, many mineral resources of the future, such as manganese nodules, manganese horns, and hydrothermal deposits, have been developed. The potential value of these deep-sea mineral resources is gradually increasing as resources on land are depleted and demand for valuable metal resources is rapidly increasing.

Deep-sea mineral resources, in particular the deep-sea manganese nodule, are in the form of a potato-like mass or spheroid, light brown with a light amorphous color. As shown in FIG. 1, in general, a system for collecting manganese masses in the deep sea, a condensing device (A) for collecting manganese masses at the sea bottom, temporarily storing the collected manganese masses, and to facilitate transmission through the bile ducts Buffer device (B) to form slurry of manganese nodules and sea water at the optimum concentration, and a positive light device (C) to vertically transfer to the mining line (D) by applying pressure to the slurry flowing through the lower anode tube, from the transferred slurry It comprises a mining line (D) to separate and store the manganese mass.

Here, the positive light device (C) includes a motor for driving the pump and the pump, and is a device for transmitting the slurry flowing from the buffer device (B) to the sea light line (D) by the pump. The lift device is connected to the lower and upper lift tubes, and pumps the slurry flowing from the lower lift tube to the upper lift tube. The motor is electrically connected to the power cable provided from the mining line (D), and is driven electrically, and pumps the slurry to the upper positive tube by a pump rotated by the rotation axis of the motor.

On the other hand, the motor used in the positive light device (C) generates high heat due to friction of components constituting the motor when used. If the heat generated by the motor is not sufficiently cooled within the operating temperature range, various problems such as deterioration of power lines and damage to components may occur due to high heat. In particular, in the case of malfunction of the motor due to high heat in the lifting device installed in the deep sea, the lifting device must be pulled back to the sea level to be repaired, resulting in excessive cost.

The present invention is to solve the above-mentioned problems, a motor unit is provided with a motor heat dissipation means for effectively cooling the heat generated by the motor device, especially the motor used in the mining device for the transport of deep sea mineral resources using sea water in the deep sea It aims to provide.

In particular, the present invention, by circulating the air-tightly filled lubricant inside the motor casing to exchange heat with the slurry passing through the outside of the motor casing, a lubricant circulation path is provided that can effectively release heat generated by the motor components. It is an object to provide a motor unit.

The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood from the following description.

The motor unit according to the present invention, a motor cavity is formed therein a rotating shaft, a bearing part rotatably supporting the rotating shaft, a rotor fixed to the rotating shaft, a spacer separated from the rotor and a coil wound stator, and A motor cavity frame in which circulating impellers coupled to and rotated at one end of the rotating shaft are respectively disposed; And a cooling frame accommodating the motor cavity frame therein and provided with a cooling channel between the motor cavity frame, and a lubricant filled airtightly inside the motor cavity frame and the cooling frame is rotated along the rotation axis. The circulating impeller is characterized in that the lubricating medium circulation path flowing through the bearing part, the stator, and the cooling channel sequentially and then flowing back into the circulating impeller is formed.

In particular, the lubricant used in the motor unit according to the present invention is preferably water. In addition, the coil wound on the stator preferably includes an electrically conductive metal wire and a waterproof tube covering the metal wire.

On the other hand, a positive light device using a motor unit according to the present invention, a positive light device comprising a motor unit for rotating and driving a rotating shaft, and a pump unit including at least one pump for driving a drive connected to the rotating shaft, from a lower positive light tube A plurality of mutually spaced cone flow regulators for distributing a slurry inlet through which a slurry containing submarine minerals and seawater is sucked, and a plurality of radial flow paths radially extending with respect to the rotating shaft on the inner surface. Suction flange portion comprising; A lower casing portion including a plurality of linear flow regulators spaced apart from each other to form a plurality of linear flow paths in which the motor units are accommodated, and continuous to each of the plurality of radial flow paths on an inner surface; An upper casing part having one end connected to the lower casing and receiving the pump unit therein; And one end is connected to the upper casing, the pump pumped by the pump unit, the discharge flange is discharged to the upper positive tube; may be configured to include.

Here, the above-mentioned photocatalytic device is interposed between the motor unit and the photo-optical pump, and a plurality of confluence flow paths are formed in which the slurries flowing from each of the plurality of linear flow paths converge in the direction of the rotation axis and are delivered to the photo-pigment pump. It may further include an inducer.

In particular, in the present positive light device, it is preferable that the sum of the cross-sectional areas of the plurality of radial passages is formed to be smaller than or equal to the cross-sectional area of the slurry inlet. Further, it is preferable that the cross-sectional area of each of the plurality of linear flow passages is formed to be smaller than or equal to the cross-sectional area of the corresponding radial flow passages.

In addition, the motor unit, a conical casing unit in close contact with each of the plurality of cone-type flow regulator; And a cylindrical casing portion in close contact with each of the plurality of linear flow regulators, and the conical casing portion may include a dimple portion curved in a circumferential shape.

In addition, the motor unit, the membrane casing disposed on one side of the cooling frame, and disposed inside the membrane casing to separate the lubricant filled inside the motor casing from the outside and at the same time inside and outside the motor casing It characterized in that it comprises a; pressure balance compensation unit comprising a membrane that can be deformed according to the pressure difference, the motor unit.

Since the motor unit according to the present invention is installed in the deep sea, it must be hermetically filled so that the lubricant filled inside the motor casing does not leak. Since the lubricating medium, which is hermetically filled inside the motor casing, is circulated by the circulation impeller and heat exchanges with the seawater passing outside the motor casing, it is possible to effectively cool the motor unit using low-temperature seawater at the deep seabed.

The positive light device including the motor unit according to the present invention may be configured to include a shroud provided with a slurry flow path structure so as to maintain a flow rate of the slurry above a settling flow rate. Searoud, through a plurality of radial flow regulators, a plurality of linear flow regulators, and a flow inducer, sedimentation of submarine mineral particles occurs inside the shroud while the solid-liquid slurry flowing from the slurry inlet is transferred to the inlet of the pump. In order not to be, the flow rate of the slurry can be kept constant.

In addition, the motor unit according to the present invention includes a pressure equilibrium compensation unit, through which the lubricant is compressed even when the external pressure (ie, water pressure) increases, thereby generating a corresponding pressure equal to the external pressure, thereby equilibrating the pressure inside and outside the motor unit. Can achieve Additionally, the motor unit according to the present invention can be utilized as an underwater motor for driving a rotating shaft, as well as a light-emitting device, installed at a deep water depth.

1 is a view schematically showing an entire mining system for mining deep-sea mineral resources.
2 is a view schematically showing a positive light device according to the present invention.
Figure 3 is a perspective view looking inside the suction flange portion constituting the shroud of the positive light device according to the present invention.
Figure 4 is a perspective view showing a lower casing constituting the shroud of the positive light device according to the present invention.
5 is a perspective view showing a flow inducer used in a positive light device according to the present invention.
6 is a cross-sectional view showing a fastening state of the flow inducer and the positive light pump.
7 is a cross-sectional view schematically showing a motor unit according to the present invention.
8 is a partial cross-sectional view for explaining the function of the pressure balance compensation unit of the motor unit according to the present invention.
9 is a perspective view showing a coil used in a motor unit according to the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail through detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail for the practice of the present invention.

First, the motor unit according to the present invention, as shown in Figure 2, may be installed in a mining device for mining deep sea mineral resources. Here, the positive light device is a shroud for receiving therein a pump unit 300 including a motor unit 200 for rotationally driving a rotating shaft (not shown) and one or more positive pumps driven in connection with the rotating shaft. It is composed. The positive light device is disposed in the central sea (about 200m to 1,000m from the sea level), suctions and pumps the slurry flowing from the buffer device from the lower positive light tube and sends it out to the sea through the upper positive light tube.

Here, the pump unit 300 is a means for transferring by applying pressure to a solid-liquid slurry composed of a mixture of solid particles of seabed minerals (eg, manganese nodules) and seawater, and is composed of a plurality of lift pumps 310 arranged in series. Can be. In addition, the motor unit 200 is a means for transmitting power to the pump unit 300, a plurality of lift pumps 310 are connected to a rotating shaft driven by the motor unit 200. The shroud is designed to support the weight of the positive and negative tubes connected to the top and bottom, the weight of the solid-liquid slurry flowing therein, and torsion by flow at the seabed. In particular, the shroud is provided with a slurry movement path through which the slurry can be transferred to the pump unit 300 via the motor unit 200 disposed therein, the structure of the shroud will be described in more detail below. .

The shroud is connected to a lower positive tube (not shown), a suction flange portion 110 supporting a load of the lower positive pipe, a lower casing portion 120 in which the motor unit 200 is accommodated, and a pump unit therein It may be composed of an upper casing 130 to which the 300 is accommodated, and a discharge flange portion 140 connected to an upper positive tube (not shown) to discharge the slurry to the sea. Here, the suction flange portion 110, the lower casing portion 120, the upper casing portion 130 and the discharge flange portion 140 refers to areas divided according to location and function, each of which is a physically separated individual member Does not mean

The suction flange portion 110 is provided with a slurry suction port 112 through which the slurry is sucked. The slurry inlet 112 is preferably formed by a circular opening symmetrical with respect to a virtual central axis P extending from a rotation axis driven by the motor unit 200. On the inner surface of the suction flange portion 110, a plurality of mutually spaced cone flow regulators are formed to distribute the slurry sucked from the slurry suction port 112 to a plurality of radial flow paths 116 radially extending with respect to the rotating shaft. That is, as shown in Figure 3, the inner surface of the suction flange portion 110 is formed in a conical shape, a plurality of cone-shaped flow regulators 114 spaced from each other are formed on the inner surface. It is preferable that the plurality of cone-shaped flow regulators 114 are arranged to be symmetrical with respect to the central axis P. The spaced apart between the cone-shaped flow regulators 114 functions as a radial flow path 116. The cone-type flow regulator 114 is in close contact with the outer surface of the conical casing portion 210 of the motor unit 200 to be described later, whereby the slurry can be moved between the adjacent cone-type flow regulators 114 (that is, the radial flow path ( 116)).

Next, the motor unit 200 is accommodated in the lower casing 120. As shown in FIG. 4, a plurality of linear flow regulators 124 spaced apart from each other forming a plurality of straight flow paths 126 that are continuous to each of the plurality of radial flow paths 116 are formed on the inner surface of the lower casing portion 120. do. The motor unit 200 is preferably arranged so that the rotation axis coincides with the central axis (P). The plurality of linear flow regulators 124 are in close contact with the cylindrical casing portion 220 of the motor unit 200, so that the spaced apart between two neighboring linear flow regulators 124 functions as the linear flow path 126.

The upper casing part 130 is located above the lower casing part 120, and a pump unit 300 in which a plurality of the positive light pumps 310 are connected in series is accommodated therein. As shown in Figure 6, the pump pump 310 is provided with an impeller 314 inside the pump casing 312, while the impeller 314 rotates along the rotation axis R driven by the motor unit 200 The slurry is pressured. In addition, as shown in FIGS. 5 and 6, a flow inducer 320 is interposed between the motor unit 200 and the pump pump 310 disposed closest to the motor unit 200.

 The flow inducer 320 is formed with a plurality of confluence flow passages 326 that are successive to each of the plurality of straight flow passages 126, and the confluence flow passage 326 rotates the slurry flowing from the corresponding straight flow passage 126 into a rotating shaft R ) In the direction to transfer to the Yangkwang pump (310). That is, the confluence flow path 326 is formed to be connected from the edge of the first surface 321 adjacent to the motor unit 200 to the center of the second surface 322 adjacent to the positive light pump 310. The confluence flow path 326 is formed in the same number as the number of the plurality of straight flow paths 126, and the adjacent slurry flow paths 326 are divided by the separator 324.

In the positive light device including the shroud having the above-described structure, the slurry flowing into the slurry inlet 112 formed in the suction flange portion 110 is distributed along a plurality of radial flow passages 116 and a plurality of straight flow passages 126 ) After being transferred via the outer surface of the motor unit 200, joined by the confluence channel 326 provided in the flow inducer 320, flows into the yangyang pump 310, and a plurality of yangyang pump 310 ) And discharged to the upper positive tube. Here, since the slurry is composed of submarine mineral particles and seawater, if the moving speed of the slurry decreases during transport, submarine mineral particles contained in the slurry may precipitate. The mining device is placed upright in the water, and when precipitation of submarine mineral particles occurs due to a decrease in the flow rate of the slurry, the efficiency of the mining decreases, and a flow path provided in the mining device may be blocked due to deposition of submarine mineral particles. . Therefore, the flow rate of the slurry passing through the flow passage provided in the shroud should be designed in a cross-sectional structure that can be maintained above the limiting sedimentation flow rate.

In the present invention, by distributing the slurry to a plurality of narrow radial flow path 116 by a plurality of cone-shaped flow regulator 114, it is possible to maintain a constant flow rate of the slurry flowing through the slurry inlet 112. In particular, by adjusting the dimensions and / or the number of installations of the plurality of cone-type flow regulators 114, the sum of the cross-sectional areas of each of the plurality of radial flow paths 116 (meaning the cross-sectional area perpendicular to the direction of movement of the slurry) is a slurry. By being formed to be smaller than or equal to the cross-sectional area of the inlet 112 (meaning a cross-sectional area perpendicular to the direction of movement of the slurry), the slurry passing through the slurry inlet 112 is distributed to the radial flow passage 116 without lowering the flow rate. can do.

Similarly, a plurality of linear flow paths 126 that are continuous to each of the radial flow paths 116 are formed by the plurality of linear flow regulators 124. Here, the dimensions and / or the number of installations of the plurality of linear flow regulators 124 are, when the slurry passing through each of the radial flow passages 116 passes through the corresponding straight flow passage 126, the flow velocity of the slurry is equal to or higher than the limiting sedimentation speed. It can be designed to be maintained. In particular, the straight flow path 126 is formed by a path consisting of neighboring linear flow regulators 124 and the outer surface of the motor unit 200, the cross-sectional area of the straight flow path 126 (cross-sectional area perpendicular to the direction of movement of the slurry) It is preferable that it is formed to be smaller than or equal to the cross-sectional area (meaning a cross-sectional area perpendicular to the direction of movement of the slurry) of the corresponding radial flow path 116.

In addition, the plurality of confluence flow passages 326 provided in the flow inducer 320 adjusts the size and number of installations of the separators 324, so that the slurry passing through the confluence flow passages 326 continuous to the straight flow passages 126 is formed. The flow rate can be controlled to be above the settling flow rate. That is, the cross-sectional area of each of the confluence flow paths 326 (meaning a cross-sectional area perpendicular to the direction of movement of the slurry) is smaller than the cross-sectional area of the corresponding straight flow paths 126 (meaning a cross-sectional area perpendicular to the direction of movement of the slurry). It is preferably designed to be equal to or equal to.

In this way, the flow path structure of the slurry provided in the shroud constituting the positive light device according to the present invention is formed to maintain the flow rate of the slurry above the settling flow rate. In particular, when the dimensions and number of installations of the plurality of radial flow regulators 114, the plurality of linear flow regulators 124, and the separators 324 are adjusted, the solid-liquid slurry flowing from the slurry suction port 112 is a positive light pump 310. While being transported to the inlet of the, it is possible to maintain a constant flow rate of the slurry to prevent precipitation of submarine mineral particles inside the shroud.

On the other hand, the motor unit 200 according to the present invention is disposed on the lower side inside the shroud. Therefore, the slurry flowing into the slurry inlet 112 is transferred to the pump unit 300 disposed on the upper side via the outer surface through the front end of the motor unit 200. At this time, the heat generated in the motor unit 200 is heat-exchanged with low-temperature seawater contained in the slurry passing through the outer surface of the motor unit 200.

The structure of the motor unit 200 will be described with reference to FIG. 7.

The motor casing constituting the motor unit 200 is accommodated in the lower casing part 120 of the shroud, and the conical casing part 210 closely contacting each of the plurality of cone-shaped flow regulators 114, and a plurality of linear flow regulators (124) may be composed of a cylindrical casing 220 in close contact with each. Various components for driving the rotating shaft R are disposed in the cylindrical casing 220 at an appropriate position.

Here, the slurry flowing through the slurry inlet 112 is distributed to the radial flow path 116 along the outer surface of the conical casing portion 210, and then the straight flow path 126 along the outer surface of the cylindrical casing portion 220 ). At this time, the tip portion 212 of the conical casing portion 210 is provided with a dimple portion 213 curved in a circumferential shape. The dimple part 213 is formed to prevent the formation of turbulence by colliding the submarine mineral particles contained in the solid-liquid slurry flowing from the slurry inlet 112 against the conical casing part 210. The dimple part 213 smoothly guides the direction of movement of the submarine mineral particles flowing from the slurry inlet 112 into the radial flow passage 116, thereby minimizing the change in the flow rate of the slurry.

On the other hand, the cylindrical casing unit 220 is provided with a motor driving unit for rotating the rotation shaft (R). That is, the motor cavity 231 provided in the cylindrical casing part 220 includes a rotating shaft R, a bearing portion 232 rotatably supporting the rotating shaft R, and a rotor fixed to the rotating shaft R ( 233), and the rotor 233 is disposed spaced apart at a predetermined distance, the coil is wound stator 234 is disposed. The bearing part 232 supports the rotating shaft R to rotate freely, and includes a bearing ball 232a and a bearing carrier 232b. A power cable (not shown) is connected to the stator 234 to generate electromagnetic force by the supplied power, and the rotor 233 fixed to the rotating shaft R is rotated by the electromagnetic force generated by the stator 234, thereby rotating the shaft (R) is rotated. Since the bearing unit 232, the rotor 233, and the stator 234 constituting the motor driving unit may use a conventional motor configuration, detailed descriptions of these components will be omitted here.

A lubricant is hermetically filled in the cylindrical casing portion 220, which functions as a motor casing in which the motor driving elements described above are installed. In addition, a pressure balance compensator is installed under the cylindrical casing 220. The pressure equilibrium compensating unit is provided with a membrane 251 that is deformable according to thermal expansion, thermal contraction or differential pressure of seawater pressure, and a membrane provided with a membrane cavity 252 in which the membrane 251 is disposed to provide a deformable space. It comprises a casing 250. The pressure balance compensation part may be disposed in an empty space provided inside the conical casing part 210 disposed under the cylindrical casing part 220. In addition, a boundary membrane 253 may be disposed on the upper end of the membrane casing 250 to prevent the membrane 251 from being deformed and introduced into the cylindrical casing 220. In addition, the membrane casing 250 is formed with a fluid inlet 250a through which external fluid flows. In addition, an opening 253a in which the lubricant filled in the cylindrical casing 220 is introduced and discharged into the membrane cavity 252a is formed in the boundary layer 253.

When the function of the pressure balance compensator is described in detail, the positive light device according to the present invention is disposed in the central sea (between about 200m and 1,000m from the sea level), so that the pressure difference of about 20bar to 100bar occurs inside and outside the motor casing. Can be. However, manufacturing the motor unit 200 so that the motor casing has a strength strength capable of withstanding a differential pressure of 20 bar to 100 bar, as well as causing a problem that the weight of the positive light device itself is too large, is not economically realistic. That is, designing the thickness of the motor casing to withstand sea water pressure as a proof strength design is not realistic due to various limitations for driving the positive light device. In addition, when the lubricant that is hermetically filled inside the motor casing is thermally expanded or thermally contracted by heat generated when the positive light device is driven, there is a risk that the motor is damaged due to a pressure difference from the outside and the airtight charging state of the lubricant is released. .

In order to solve this problem, a pressure balance compensator having the above-described structure is installed as a means for achieving a pressure balance by canceling and compensating for a pressure difference between the inside and the outside of the motor casing. The membrane 251 constituting the pressure balance compensator is contracted or expanded according to thermal expansion or thermal contraction of a lubricant filled in the motor casing, or deformed according to a differential pressure inside and outside the motor casing due to sea water pressure, thereby allowing the inner and outer surfaces of the motor casing. Compensate for pressure differences to achieve equilibrium.

For example, seawater flowing through the opening 211 formed in the conical casing part 210 (arrow ⓐ) flows into the membrane cavity 252 through the fluid inlet 250a formed in the membrane casing 250 (arrow ⓑ). )do. At this time, the membrane cavity 252 is divided into an inner cavity 252a filled with a lubricant by the membrane 251 and an outer cavity 252b into which an external fluid (ie, seawater) is introduced and received.

As shown in FIG. 8, the membrane 251 may be deformed to the motor casing side by the high pressure seawater 200b flowing into the external cavity 252b. Thereby, the area of the outer cavity 252b increases, and the area of the inner cavity 252a decreases. At this time, as the area of the inner cavity 252a is reduced, the lubricant 200a filled in the motor casing is compressed. Therefore, even if the external pressure (ie, water pressure) increases, the mechanical components constituting the motor driving unit are not directly damaged and only the lubricant is compressed, thereby achieving a pressure balance inside and outside the motor unit. Conversely, when the lubricant 200a expands due to heat generated inside the motor according to the operation of the motor driving unit, the membrane 251 is deformed outward again, thereby reducing the area of the outer cavity 252b and simultaneously the inner cavity. The pressure equilibrium is maintained as the area 252a increases.

Here, the membrane 251 may be formed using a soft metal material or a synthetic resin material. The membrane 251 may be any material that can be used as long as it separates the lubricant medium and the external fluid (eg, seawater) that are hermetically filled inside the motor casing, and at the same time is a deformable material to achieve a pressure balance between the two. In addition, the membrane 251 is preferably a material that can be restored so that the airtightness of the lubricant can be maintained even after several shrinkages or expansions.

On the other hand, in the motor unit according to the present invention, a cooling structure is provided inside the cylindrical casing part 220 constituting the motor casing to discharge heat generated in the motor driving part by circulation of the lubricant.

Returning to FIG. 7 again, the cylindrical casing unit 220 is a motor cavity frame 230 having a motor cavity 231 on which a rotating shaft R, a bearing unit 232, a rotor 233, and a stator 234 are disposed. ) And a cooling frame 240 that accommodates the motor cavity frame 230 therein and is provided with a cooling channel 242 therebetween. In particular, the lower side of the motor cavity frame 230 is installed with a circulating impeller 235 that is fastened to one end of the rotating shaft R and rotated. The lubricant is hermetically filled into the entire space inside the cooling frame 240, including the motor cavity 231 provided inside the motor cavity frame 230.

Inside the motor cavity frame 230 and the cooling frame 240, a lubricant introduced into the motor cavity 231 by a circulating impeller 235 rotated along a rotation axis R, an area where the bearing part 232 is formed (Arrow ②), the area between the stator 234 and the rotor 233 (arrow ③), and passes through the cooling channel 242 (arrow ④) to the circulation impeller 235 side (arrow ①), again The circulation path of the lubricant medium that can be introduced into the motor cavity 231 by the circulation impeller 235 is formed. The lubricating medium circulated in this way takes heat generated from the bearing part 232, heat generated from the stator 234, and heat generated from the rotor 233, and then passes through the cooling channel 242 to cool the frame 240. ) By exchanging heat with the low-temperature slurry passing through the outside, heat generated inside the motor is discharged to the outside. Incidentally, the lubricating medium may also be filled in the membrane cavity 252a provided inside the membrane casing 250 installed under the cooling frame 230. The lubricant medium 200a filled in the inner cavity 252a may be heat-exchanged through the seawater and the membrane 251 filled in the outer cavity 252b.

When the motor unit according to the present invention is used in a mining apparatus for mining deep sea mineral resources, it must be hermetically filled so that the lubricant filled inside the motor casing does not leak. In this environment, when the lubricant is circulated along the circulation path of the lubricant by the circulation impeller 235, the cooling efficiency of the motor can be maximized by exchanging heat generated in the motor components with seawater passing outside the motor casing. . At this time, if the outer circumferential surface of the cooling frame 240 forming the cooling channel 242 between the motor cavity frame 230 is formed of a heat dissipation panel 241 formed of a material having excellent thermal conductivity, cooling efficiency can be further improved. .

On the other hand, when the motor unit according to the present invention is used in a positive light device for transporting deep sea mineral resources, it is recommended to use water as a lubricant to minimize marine pollution even if leakage of the lubricant filled in the motor unit occurs. desirable. At this time, the coil wound on the stator 234, it is preferable to use a coil comprising an electrically conductive metal wire (234a) and a waterproof tube (234b) covering it. For example, when a metal wire 234a such as copper is in direct contact with water as a lubricant, a short circuit may occur, so it is preferable to use a coil coated with a waterproof tube 234b that blocks contact with water. Here, a synthetic resin material such as PVC may be used as the waterproof tube 234b.

The preferred embodiments of the present invention have been described so far, but those skilled in the art to which the present invention pertains may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described herein should be considered from a descriptive point of view rather than a limiting point of view, and the scope of the present invention is shown in the claims rather than the above description, and all differences within the equivalent ranges of the present invention It should be interpreted as being included in.

Claims (4)

As a motor unit used in a lifting device for the transport of deep sea mineral resources,
A motor cavity is formed, therein a rotating shaft, a bearing part rotatably supporting the rotating shaft, a rotor fixed to the rotating shaft, a stator wound with a coil wound from the rotor, and rotated while being fastened to one end of the rotating shaft A motor cavity frame in which circulating impellers are arranged; And
It includes a motor casing that includes; a cooling frame that accommodates the motor cavity frame therein, a cooling channel is provided between the motor cavity frame, and a heat dissipation panel is formed on an outer circumferential surface where the cooling channel is provided,
Inside the motor casing, the motor cavity frame and the lubricating medium air-tightly filled in the cooling frame pass through the bearing part, the stator, and the cooling channel sequentially by the circulation impeller rotated along the rotation axis, and then again the The circulation path of the lubricating medium flowing into the circulation impeller is formed,
The membrane casing disposed on one side of the cooling frame, and the lubricating medium disposed inside the membrane casing and charged inside the motor casing separate from the outside, and at the same time, the ductility deformable according to the pressure difference between the inside and outside of the motor casing It characterized in that it comprises a; pressure balance compensation unit comprising a membrane formed of a metal material of, a motor unit.
According to claim 1,
The lubricating medium is water, characterized in that the motor unit.
According to claim 2,
The coil wound on the stator, characterized in that it comprises an electrically conductive metal wire and a waterproof tube covering the metal wire, the motor unit.
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