Sealed wire outlet device of marine permanent magnet motor

Abstract

The utility model relates to a sealed wire outlet device of a marine permanent magnet motor. The sealed wire outlet device is characterized by comprising a stainless steel cable waterproof joint, a junction box seat, a grounding device, a wiring copper bar, an insulator, a wiring sealing plate and a junction box cover, the wiring copper bar is connected to a transverse strip in the junction box seat through an insulator; the insulator is made of an insulating material, and threads are drilled at two ends; the wiring sealing plate is a rectangular plate, and a plurality of through holes for threading are drilled in the middle of the wiring sealing plate; a sealing gasket is arranged at the bottom of the wiring sealing plate and is fixed on the junction box seat through screws; a grounding device is arranged on one side in the junction box seat; a plurality of stainless steel cable waterproof joints are arranged on one side outside the junction box seat; and a multi-layer sealing structure is arranged among the junction box seat, the junction box cover and the base. According to the utility model, space is effectively saved, debugging and installation in a narrow space of a ship are facilitated, and electromagnetic interference is effectively inhibited; the safety performance of the motor is improved, and the service life of the motor is prolonged; potential safety hazards are avoided; and the protection level is improved.

Description

Technical Field

[0001] This utility model relates to the field of marine permanent magnet motor technology, and specifically to a sealed cable outlet device for marine permanent magnet motors. Background Technology

[0002] Aiming at the national "dual-carbon" strategy and the green and low-carbon development needs of the Yangtze River shipping industry, and accelerating the implementation of the Yangtze River Shipping Group's "dual-carbon" strategy special plan and "one enterprise, one policy" approach, the primary goal is to support the improvement of the economy and safety of Yangtze River vessels with the technological advantages of new power systems. Based on the functional requirements and operating environment characteristics of Yangtze River vessels, research on integrated electric propulsion systems is being conducted to determine the optimal overall scheme for ship electric propulsion systems. Typical marine direct-drive permanent magnet motors are being developed and standardized product lines are being established. This will comprehensively enhance the overall innovation and R&D design capabilities and key equipment manufacturing capabilities of the Yangtze River Shipping Group, strengthen the company's core competitiveness, and continuously lead the high-quality development of Yangtze River shipping. Marine direct-drive permanent magnet motors will become the development direction of green power systems for inland waterway vessels in my country. This practical marine direct-drive permanent magnet motor has no reduction gearbox, directly drives the propeller, and propels 10,000-ton Yangtze River vessels, achieving optimized matching between ship, engine, and propeller. It supports energy saving, consumption reduction, and efficiency improvement for Yangtze River vessels, and has advantages such as low-speed high torque, high efficiency, high power factor, low vibration, and low noise. The marine direct-drive permanent magnet motor uses built-in permanent magnets with an excellent magnetic circuit structure and good field weakening speed regulation capability. Currently, commercial ships are powered by main propulsion diesel engines, with diesel generator sets supplying electricity to the entire ship. This presents problems such as large peak capacity, power quality stability, and safety and reliability. Marine direct-drive permanent magnet motors have replaced diesel engine propulsion motors, enabling low-speed navigation. This is more conducive to energy conservation and emission reduction, saving transportation costs and contributing to the sustainable development of shipping companies.

[0003] The shortcomings of existing technology are:

[0004] 1. The existing junction box has a poor sealing structure design, which allows water vapor and salt spray to seep in, causing internal short circuits or corrosion.

[0005] 2. The existing terminal block structure has a small wiring cavity space and insufficient cable bending radius, especially since marine cables are thicker and more difficult to bend than ordinary cables.

[0006] 3. Without a wiring seal plate, there is a risk that small objects may fall into the motor when the user connects the wires.

[0007] 4. The existing terminal block size is too small, the cable shielding layer is not effectively connected, and electromagnetic interference affects the vector control accuracy of the permanent magnet motor.

[0008] 5. The hull structure is too thin to withstand ship vibrations. Summary of the Invention

[0009] This utility model addresses the aforementioned problems by providing a sealed cable outlet device for marine permanent magnet motors. Its purpose is to enhance the strength and sealing performance of the junction box while achieving a lightweight design, effectively saving space and facilitating debugging and installation in the confined spaces of a ship. It also effectively suppresses electromagnetic interference, improves the safety performance of the motor, extends its service life, avoids safety hazards, and prevents small objects from entering the motor during wiring, thereby improving the protection level.

[0010] To solve the above problems, the technical solution provided by this utility model is as follows:

[0011] The sealed cable outlet device for marine permanent magnet motors is characterized by comprising: a stainless steel waterproof cable connector, a junction box base, a grounding device, a copper busbar, an insulator, a wiring sealing plate, and a junction box cover, wherein:

[0012] The copper busbars are connected to the horizontal bars inside the junction box using the insulators; the insulators are made of insulating material and have threads drilled at both ends; the copper busbars include U-phase, V-phase, and W-phase, with sufficient electrical spacing between adjacent copper busbars, and sufficient electrical spacing between the copper busbars and the bottom of the junction box; the wiring sealing plate is a rectangular plate with multiple through holes drilled in the middle for wire threading; the bottom of the wiring sealing plate is sealed with a gasket and fixed to the junction box with screws; the grounding device is provided on one side inside the junction box; multiple stainless steel waterproof cable connectors are provided on one side outside the junction box.

[0013] Preferably, each phase of the terminal busbar is fixed with two insulators to ensure mechanical strength.

[0014] Preferably, the spacing between adjacent copper busbars is 80mm to 120mm.

[0015] Preferably, the wiring sealing plate has a length of 400mm to 700mm, a width of 150mm to 300mm, and a thickness of 10mm to 15mm.

[0016] Preferably, the wiring sealing plate is made of an insulating board and has sealing properties.

[0017] Preferably, the number of through holes is set to 6 to 18 according to the size and quantity of the cable, divided into three groups of 2 to 6 holes each, and the spacing and diameter of the through holes in the adjacent groups are 20mm to 30mm.

[0018] Preferably, a silicone sealing gasket is provided between the junction box base and the junction box cover, and sealant is applied to the interface to fill microscopic gaps.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] 1. Due to the reasonable arrangement of the U-phase, V-phase, and W-phase of the wiring copper busbar in this utility model, space can be effectively saved, which is conducive to debugging and installation in the narrow space of the ship and effectively suppresses electromagnetic interference.

[0021] 2. Because the U, V, and W phases of this utility model have sufficient electrical spacing between each phase and each cable, it can not only improve the safety performance of the motor, but also extend the service life of the motor.

[0022] 3. Because the wiring sealing plate of this utility model makes the motor winding leads neatly and compactly arranged after passing through the frame, it avoids the damage caused by squeezing and stretching of the leads during installation to the copper busbar, thus avoiding safety hazards.

[0023] 4. Because the wiring sealing plate of this utility model seals the wire outlet hole of the base, it prevents small objects from entering the motor during wiring. Whether it is the installation of the finished motor, the wiring for testing and debugging, or the wiring used by the user, the motor can achieve a high level of protection even if the junction box cover is removed.

[0024] 5. The lightweight design of the sealed cable outlet junction box base adopts an integrated molded shell, reducing welds and avoiding stress weak points. The shell has high strength and can withstand the continuous vibration and impact of the ship. The multi-layer sealing structure between the junction box base, junction box cover and base effectively protects the motor from water vapor and salt spray. Attached Figure Description

[0025] Figure 1 This is a front view of the cable outlet device according to a specific embodiment of the present utility model;

[0026] Figure 2 This is an exploded structural diagram of the wire outlet device parts according to a specific embodiment of the present utility model;

[0027] Figure 3 This is a cross-sectional structural diagram of the cable outlet device according to a specific embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the junction box cover structure of the outgoing wire device according to a specific embodiment of this utility model.

[0029] Among them: 601. Stainless steel waterproof cable connector, 602. Junction box base, 603. Grounding device, 604. Copper busbar, 605. Insulator, 606. Wiring sealing plate, 602a. Horizontal bar, 606a. Through hole, 607. Cable, 608. Junction box cover. Detailed Implementation

[0030] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0031] like Figure 1 , 2 As shown, the sealed cable outlet device for a marine permanent magnet motor is characterized by comprising: a stainless steel waterproof cable connector 601, a junction box base 602, a grounding device 603, a copper busbar 604, an insulator 605, a wiring sealing plate 606, and a junction box cover 608, wherein:

[0032] The copper busbar 604 is connected to the horizontal bar 602a inside the junction box 602 by an insulator 605; the insulator 605 is made of insulating material and has threads drilled at both ends; the copper busbar 604 includes U phase, V phase, and W phase, and there is sufficient electrical clearance between adjacent copper busbars 604, and there is also sufficient electrical clearance between the copper busbar 604 and the bottom of the junction box 602; the wiring sealing plate 606 is a rectangular plate, and there are multiple through holes 606a drilled in the middle of the wiring sealing plate 606 for wire passing; the bottom of the wiring sealing plate 606 is sealed with a gasket and fixed to the junction box 602 by screws; a grounding device 603 is provided on one side inside the junction box 602; multiple stainless steel waterproof cable connectors 601 are provided on one side outside the junction box 602.

[0033] It should be noted that each phase copper busbar 604 is fixed with two insulators 605 to ensure mechanical strength. The reasonable arrangement of the U, V, and W phases of the copper busbar 604 can effectively save space, facilitate debugging and installation in the confined space of a ship, effectively suppress electromagnetic interference, and ensure sufficient electrical spacing between the three phases U, V, and W, as well as between each phase and each cable 607. This not only improves the safety performance of the motor but also extends its service life.

[0034] In this specific embodiment, the spacing between adjacent copper busbars 604 is 100mm.

[0035] It should be noted that a silicone sealing gasket is provided between the junction box base 602 and the junction box cover 608, and sealant is applied to the interface to fill the micro gaps.

[0036] It should be noted that the wiring sealing plate 606 ensures that the motor winding leads are neatly and compactly arranged after exiting the frame, preventing damage caused by compression or stretching during installation to the copper busbar 604, thus avoiding safety hazards. Furthermore, the wiring sealing plate 606 effectively prevents external debris from entering the motor stator windings during lead installation. MW-class marine permanent magnet motors have rated torques exceeding 10,000 N·m. Due to the strong magnetic force of the permanent magnet rotor, stator and rotor assembly requires a specialized assembly machine. Even so, secondary assembly during motor assembly should be avoided as much as possible. Therefore, the advantage of the wiring sealing plate 606 is that it seals the wiring outlet holes in the frame, preventing small objects from entering the motor during wiring. Whether it's finished motor installation, testing, debugging, or user wiring, the motor maintains a high level of protection even after the junction box cover is removed. Figure 3 As shown, cable 607 is sealed with adhesive after passing through wiring sealing plate 606.

[0037] In this specific embodiment, the wiring sealing plate 606 is 600mm long, 200mm wide, and 12mm thick.

[0038] It should be further noted that the wiring sealing plate 606 is made of insulating board and has sealing properties.

[0039] In this specific embodiment, there are 12 through holes 606a, divided into three groups of 4, with a spacing of 30mm between two adjacent groups of through holes 606a; the diameter of each through hole 606a is 25mm.

[0040] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0041] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0042] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sealed terminal device of a marine permanent magnet motor, characterized in that: Includes a stainless steel waterproof cable connector (601), a junction box base (602), a grounding device (603), a copper busbar (604), an insulator (605), a wiring sealing plate (606), and a junction box cover (608), among which: The copper busbar (604) is connected to the horizontal bar (602a) inside the junction box (602) by the insulator (605); the insulator (605) is made of insulating material and has threads drilled at both ends; the copper busbar (604) includes U phase, V phase and W phase, and there is sufficient electrical spacing between adjacent copper busbars (604), and there is also sufficient electrical spacing between the copper busbar (604) and the bottom of the junction box (602); the wiring sealing plate (606) is a rectangular plate, and there are multiple through holes (606a) drilled in the middle of the wiring sealing plate (606) for wire threading; the bottom of the wiring sealing plate (606) is sealed with a gasket and fixed to the junction box (602) by screws; the grounding device (603) is provided on one side inside the junction box (602); multiple stainless steel cable waterproof joints (601) are provided on one side outside the junction box (602).

2. The sealed outlet of a marine permanent magnet electric machine according to claim 1, characterized in that: Each phase of the copper busbar (604) is secured by two insulators (605) to ensure mechanical strength.

3. The sealed outlet of a marine permanent magnet electric machine according to claim 2, characterized in that: The spacing between adjacent copper busbars (604) is set at 80mm to 120mm depending on the size and quantity of the cables.

4. The sealed terminal arrangement for a marine permanent magnet electric machine according to claim 3, characterized in that: The wiring sealing plate (606) has a length of 400mm to 700mm, a width of 150mm to 300mm, and a thickness of 10mm to 15mm.

5. The sealed terminal arrangement for a marine permanent magnet electric machine according to claim 4, characterized in that: The wiring sealing plate (606) is made of insulating board and has sealing properties.

6. A sealed outlet for a marine permanent magnet electric machine according to claim 5, characterized in that: The number of through holes (606a) is set to 6 to 18 according to the size and quantity of the cable, divided into three groups of 2 to 6 holes in each group. The spacing and diameter of the through holes (606a) between two adjacent groups are 20mm to 30mm.

7. The sealed cable outlet device for a marine permanent magnet motor according to claim 5, characterized in that: A silicone sealing gasket is provided between the junction box base (602) and the junction box cover (608), and sealant is applied to the interface to fill the micro gaps.

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