A generator

Abstract

This application relates to the field of generator technology, and more particularly to a generator. The generator includes a frame, a stator assembly, a rotor assembly, and a first sealing assembly. The frame has a mounting cavity with a first opening for communication with the outside. The stator assembly is fixed within the mounting cavity. Along the radial direction of the stator assembly, the rotor assembly is rotatably disposed inside the stator assembly, and the rotor assembly is coaxially arranged with the stator assembly. The first sealing assembly includes a first sealing structure and a second sealing structure. The first sealing structure covers the surface of the stator assembly, and the second sealing structure covers the surface of the rotor assembly. Along the radial direction of the stator assembly, the first sealing structure and the second sealing structure are spaced apart to form an air gap, which communicates with the first opening. Applying the technical solution of this application can improve the sealing performance and heat dissipation of the generator.

Description

Technical Field

[0001] This application relates to the field of generator technology, and more particularly to a generator. Background Technology

[0002] As a key piece of equipment in marine energy development, generators need to operate for extended periods in high-pressure, high-humidity, and complex fluid environments. When designing generators, it is essential to meet both internal sealing requirements and efficient heat dissipation. Currently, it is difficult to balance sealing reliability and heat dissipation efficiency in generators. Therefore, there is an urgent need to provide a generator that synergistically optimizes both sealing performance and heat dissipation. Utility Model Content

[0003] To address the aforementioned problems, this application provides a generator that improves the generator's sealing and heat dissipation.

[0004] This application provides a generator, which includes a frame, a stator assembly, a rotor assembly, and a first sealing assembly. The frame has a mounting cavity with a first opening for communication with the outside. The stator assembly is fixed in the mounting cavity. The rotor assembly is rotatably disposed inside the stator assembly along the radial direction of the stator assembly, and the rotor assembly is coaxially disposed with the stator assembly. The first sealing assembly includes a first sealing structure and a second sealing structure. The first sealing structure covers the surface of the stator assembly, and the second sealing structure covers the surface of the rotor assembly. The first sealing structure and the second sealing structure are spaced apart along the radial direction of the stator assembly to form an air gap, which communicates with the first opening.

[0005] The technical solution provided in this application includes a generator comprising a frame, a stator assembly, a rotor assembly, and a first sealing assembly. The frame has a mounting cavity with a first opening, through which the stator assembly can be fixedly mounted. Along the radial direction of the stator assembly, the rotor assembly is rotatably disposed inside the stator assembly and coaxially arranged with it to convert the mechanical energy transmitted by the rotor assembly into electrical energy through electromagnetic induction. The first sealing assembly includes a first sealing structure and a second sealing structure. The first sealing structure covers the surface of the stator assembly, and the second sealing structure covers the surface of the rotor assembly. This design prevents direct contact between the stator and rotor assemblies and liquid when liquid enters the mounting cavity. While meeting the internal sealing requirements of the generator, the liquid also cools the stator and rotor assemblies, thereby improving the generator's heat dissipation. Along the radial direction of the stator assembly, the first and second sealing structures are spaced apart to form an air gap, which communicates with the first opening. Here, the first sealing structure and the second sealing structure form independent seals for the stator assembly and the rotor assembly, respectively, allowing liquid to pass through the air gap. On the one hand, when the liquid flows through the air gap, it can directly carry away the heat of the stator assembly and the rotor assembly, further improving the heat dissipation of the generator. On the other hand, the continuous flow of liquid can wash away the deposits or microorganisms (such as barnacles and algae) on the surface of the first sealing structure and the second sealing structure, reducing the impact of biofouling on the electromagnetic performance of the generator.

[0006] In one possible implementation provided in this application, the first sealing structure includes a sealing housing and a first sealing element. The sealing housing is disposed on the base to form a first sealing cavity together with the base. The stator assembly is located in the first sealing cavity, and the first sealing element is filled between the stator assembly and the inner wall of the first sealing cavity.

[0007] In one possible implementation provided in this application, the rotor assembly includes a yoke and permanent magnets. The yoke is continuously arranged along the circumference of the rotor assembly, and the permanent magnets are arranged on the outer side of the yoke along the radial direction of the rotor assembly. Multiple permanent magnets are spaced apart along the circumference of the rotor assembly. The second sealing structure includes a second sealing member. Along the radial direction of the rotor assembly, the second sealing member covers the outer side of the yoke and covers the permanent magnets located on the outer side of the yoke.

[0008] In one possible implementation provided in this application, the base includes a bearing assembly and a rotating shaft. The bearing assembly includes a bearing mounting structure and a bearing. The bearing mounting structure has a bearing mounting cavity and a shaft hole communicating with the bearing mounting cavity. The bearing is installed in the bearing mounting cavity. The rotating shaft is connected to the bearing via the shaft hole. The rotor assembly is rotatably disposed inside the stator assembly via the rotating shaft. The generator also includes a second sealing assembly disposed between the rotating shaft and the shaft hole. The second sealing assembly includes a third sealing structure and a fourth sealing structure, which are spaced apart along the axial direction of the rotating shaft.

[0009] In one possible implementation provided in this application, the bearing mounting structure includes a first seat and a second seat. The first seat has a bearing mounting cavity, and along the axial direction of the rotating shaft, the bearing mounting cavity has a second opening. The second seat has a shaft hole, and the second seat is disposed at the second opening so that the shaft hole communicates with the bearing mounting cavity.

[0010] In one possible implementation provided in this application, the bearing mounting structure further includes a first sealing cover, the first sealing cover having a mounting hole through which the rotating shaft fits, and the first sealing cover being disposed at one end of the shaft hole facing away from the first housing.

[0011] In one possible implementation provided in this application, the bearing mounting cavity further has a third opening along the axial direction of the shaft. The third opening is located on the side of the bearing mounting cavity facing away from the second opening, and the bearing mounting structure further includes a second sealing cover disposed at the third opening.

[0012] In one possible implementation provided in this application, the third sealing structure includes a first skeleton oil seal and a second skeleton oil seal, with the sealing lips of the first skeleton oil seal and the second skeleton oil seal facing opposite directions along the axial direction of the rotating shaft.

[0013] In one possible implementation provided in this application, a fourth sealing structure is disposed on the side of the third sealing structure away from the bearing. The fourth sealing structure includes a lip seal ring, the sealing lip of which extends toward the side away from the third sealing structure.

[0014] In one possible implementation provided in this application, at least two lip seals are spaced apart along the axial direction of the shaft. Attached Figure Description

[0015] Figure 1 This is one of the structural schematic diagrams of the generator provided in the embodiments of this application;

[0016] Figure 2 This is a schematic diagram of the internal structure of the power generation terminal provided in an embodiment of this application;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0019] Figure 5 This is a schematic diagram of the bearing assembly provided in an embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the impeller and rotor assembly provided in an embodiment of this application;

[0021] Figure 7 for Figure 6 Sectional view at CC;

[0022] Figure 8 for Figure 6 A partial sectional view at point D in the middle;

[0023] Figure 9 This is a schematic diagram showing the state of the potting module provided in the embodiments of this application during use;

[0024] Figure 10 This is a second schematic diagram of the generator structure provided in the embodiments of this application;

[0025] Figure 11 for Figure 10 Enlarged view of point E in the middle.

[0026] Figure label:

[0027] 1-Base; 11-Mounting cavity; 12-First opening; 13-Bearing assembly; 131-Bearing mounting structure; 1311-First seat; 13111-Bearing mounting cavity; 13112-Second opening; 13113-Third opening; 1312-Second seat; 13121-Shaft hole; 13122-Flange; 132-Bearing; 133-First sealing cover; 134-Second sealing cover; 135-First sealing ring; 136-Second sealing ring; 137-Third sealing ring; 138-Fourth sealing ring; 139-Fifth sealing ring; 14-Shaft; 15-Wear-resistant layer; 2-Stator assembly; 3-Rotor assembly; 31-Magnetic yoke; 32-Permanent magnet ; 33-Pressure strip; 4-First sealing assembly; 41-First sealing structure; 411-Sealing housing; 4111-First baffle; 4112-Second baffle; 4113-Annular pressure plate; 412-First sealing element; 42-Second sealing structure; 421-Second sealing element; 5-Second sealing assembly; 51-Third sealing structure; 511-First skeleton oil seal; 512-Second skeleton oil seal; 52-Fourth sealing structure; 521-Lip seal ring; 6-Impeller; 61-Blade; 62-Hub; 621-Hub inner sleeve; 622-Hub outer sleeve; 7-Guide shield; 8-Pouring mold; 81-Pouring body; 82-Pouring cover plate; 821-Injection hole. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0030] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0031] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0032] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0033] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0034] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0035] In the embodiments of this application, for the convenience of describing direction, the appendix is ​​attached. Figure 2The directions are indicated, with the first direction being the axial direction of the stator assembly 2 and the second direction being the radial direction of the stator assembly 2. It should be noted that the above direction markings are for description purposes only and are not intended to limit the scope of this application.

[0036] As a key piece of equipment in marine energy development, generators need to operate for extended periods in high-pressure, high-humidity, and complex fluid environments. When designing generators, it is essential to meet both internal sealing requirements and efficient heat dissipation. Currently, it is difficult to balance sealing reliability and heat dissipation efficiency in generators. Therefore, there is an urgent need to provide a generator that synergistically optimizes both sealing performance and heat dissipation.

[0037] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 This application provides a generator, which includes a frame 1, a stator assembly 2, a rotor assembly 3, and a first sealing assembly 4. The frame 1 has a mounting cavity 11, and the mounting cavity 11 has a first opening 12 for communicating with the outside. The stator assembly 2 is fixed in the mounting cavity 11. Along the radial direction of the stator assembly 2, the rotor assembly 3 is rotatably disposed inside the stator assembly 2, and the rotor assembly 3 is coaxially disposed with the stator assembly 2. The first sealing assembly 4 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 covers the surface of the stator assembly 2, and the second sealing structure 42 covers the surface of the rotor assembly 3. Along the radial direction of the stator assembly 2, the first sealing structure 41 and the second sealing structure 42 are spaced apart to form an air gap, which communicates with the first opening 12.

[0038] In this embodiment of the application, based on the working principle of the engine, the generator can be a horizontal axis underwater generator, a vertical axis underwater generator, or a floating underwater generator. This embodiment of the application does not limit the type of generator.

[0039] In this embodiment, the frame 1 is the outer casing and support structure of the generator, used to fix and protect the internal core components (stator assembly 2, rotor assembly 3, etc.) and provide a mechanical connection to the external foundation. The frame 1 is typically made of high-strength metal (cast iron, cast steel, or welded steel plate).

[0040] In this embodiment, the stator assembly 2 includes a stator core and a stator coil, which serve as the stationary part of the generator. The stator assembly 2 generates an induced electromotive force by rotating and cutting the magnetic field, thereby outputting electrical energy.

[0041] In this embodiment of the application, the rotor assembly 3 includes a rotor core. The rotor assembly 3 is rotatably disposed inside the stator assembly 2 and is coaxially disposed with the stator assembly 2 to provide a rotating magnetic field to the stator assembly 2.

[0042] In this embodiment, the first sealing structure 41 covers the surface of the stator assembly 2 to form a sealing layer on the outside of the stator assembly 2. The first sealing structure 41 can have various structural forms. For example, the first sealing structure 41 may include a liquid sealing material. When sealing the stator assembly 2, the stator core and stator coil of the stator assembly 2 can be immersed entirely in the liquid sealing material (such as epoxy resin, silicone rubber, or polyurethane), and after curing, a fully encapsulated protective layer is formed. Alternatively, the first sealing structure 41 may include insulating varnish. When sealing the stator assembly 2, the stator core and stator coil of the stator assembly 2 can be placed in a vacuum environment, and then insulating varnish is injected and pressurized to cure the insulating varnish on the surface of the stator assembly 2 to form a sealing layer.

[0043] In this embodiment, the second sealing structure 42 covers the surface of the rotor assembly 3 to form a sealing layer on the outside of the rotor assembly 3. The second sealing structure 42 can have various structural forms. For example, the second sealing structure 42 may include a liquid sealing material. When sealing the rotor assembly 3, the rotor core of the rotor assembly 3 can be completely immersed in the liquid sealing material (such as epoxy resin, silicone rubber, or polyurethane), and after curing, a fully encapsulated protective layer can be formed. Alternatively, the second sealing structure 42 may include an insulating varnish. When sealing the rotor assembly 3, the rotor core of the rotor assembly 3 can be placed in a vacuum environment, and then the insulating varnish can be injected and pressurized to cure the insulating varnish on the surface of the rotor assembly 3 to form a sealing layer.

[0044] In this embodiment, the first sealing structure 41 and the second sealing structure 42 are spaced apart along the radial direction of the stator assembly 2 to form an air gap. Here, the air gap is the physical gap between the stator assembly 2 and the rotor assembly 3 in the generator, and is an important component of the generator's magnetic circuit, directly affecting the generator's electromagnetic performance, mechanical reliability, and heat dissipation efficiency.

[0045] In the technical solution provided in this application embodiment, the generator includes a frame 1, a stator assembly 2, a rotor assembly 3, and a first sealing assembly 4. The frame 1 has a mounting cavity 11 with a first opening 12 for communication with the outside. The stator assembly 2 can be fixed within the mounting cavity 11 through the first opening 12. Along the radial direction of the stator assembly 2, the rotor assembly 3 is rotatably disposed inside the stator assembly 2 and coaxially arranged with the stator assembly 2, so that the mechanical energy transmitted by the rotor assembly 3 is converted into electrical energy through electromagnetic induction. The first sealing assembly 4 includes a first sealing structure 41 and a second sealing structure 42. The first sealing structure 41 covers the surface of the stator assembly 2, and the second sealing structure 42 covers the surface of the rotor assembly 3. Thus, when liquid enters the mounting cavity 11, direct contact between the stator assembly 2 and the rotor assembly 3 and the liquid can be avoided. While meeting the internal sealing requirements of the generator, the liquid can also cool the stator assembly 2 and the rotor assembly 3, thereby improving the generator's heat dissipation. Along the radial direction of the stator assembly 2, a first sealing structure 41 and a second sealing structure 42 are spaced apart to form an air gap, which communicates with the first opening 12. Here, the first sealing structure 41 and the second sealing structure 42 form independent seals for the stator assembly 2 and the rotor assembly 3, respectively, allowing liquid entering through the first opening 12 to pass through the air gap. On the one hand, the liquid flowing through the air gap can directly carry away the heat from the stator assembly 2 and the rotor assembly 3, further improving the heat dissipation of the generator; on the other hand, the continuous flow of liquid can wash away deposits or microorganisms (such as barnacles and algae) on the surfaces of the first sealing structure 41 and the second sealing structure 42, reducing the impact of biofouling on the electromagnetic performance of the generator.

[0046] In this embodiment, the number of first openings 12 on the mounting cavity 11 can be varied. For example, the mounting cavity 11 may have only one first opening 12. Alternatively, refer to... Figure 1 In one possible embodiment of this application, the mounting cavity 11 has first openings 12 on both opposite sides along the axial direction of the stator assembly 2. In this way, the first openings 12 on both sides can form convection channels within the mounting cavity 11, promoting the circulation of liquid within the mounting cavity 11 and further improving the cooling effect of the liquid on the stator assembly 2 and rotor assembly 3.

[0047] Reference Figure 10 and Figure 11In this embodiment, the first sealing structure 41 includes a sealing housing 411 and a first sealing element 412. The sealing housing 411 is disposed on the base 1 to form a first sealing cavity together with the base 1. The stator assembly 2 is located in the first sealing cavity, and the first sealing element 412 fills the space between the stator assembly 2 and the inner wall of the first sealing cavity. In this way, the sealing housing 411, the first sealing element 412, and the base 1 can jointly form a protective barrier for the periphery of the stator assembly 2, simplifying the waterproof sealing structure of the stator assembly 2. In addition, when the generator is working underwater, the stator assembly 2 is in contact with water through the first sealing structure 41, allowing the heat generated by the stator assembly 2 to be conducted to the water through the first sealing structure 41, thereby improving the heat dissipation of the generator.

[0048] In this embodiment, the first seal 412 can take many forms. For example, the first seal 412 can be potting compound, silicone rubber, or sealing filler. This embodiment does not limit the form of the seal.

[0049] In this embodiment, the stator assembly 2 can be assembled onto the base 1 via a heat-shrink fitting. When the first seal 412 is a potting compound, the first sealing cavity formed by the sealing housing 411 and the base 1 can constitute a potting space, so that the potting compound can pot the stator assembly 2.

[0050] In this embodiment, the sealing housing 411 can have various structural forms. For example, the sealing housing 411 may include multiple arc-shaped mounting shells, which are sequentially spliced ​​together along the axial direction of the stator core and together with the base 1 to form a first sealing cavity. Alternatively, refer to... Figure 11 The sealing housing 411 may include a first baffle 4111, a second baffle 4112 and an annular pressure plate 4113. The first baffle 4111 and the second baffle 4112 are spaced apart on the base 1 along the axial direction of the rotor assembly 3. Both the first baffle 4111 and the second baffle 4112 have a stop step. The annular pressure plate 4113 is fixed between the first baffle 4111 and the second baffle 4112 by the stop step to form a first sealing cavity.

[0051] It should be noted that when setting the first baffle 4111, the second baffle 4112, and the annular pressure plate 4113, a gap should be reserved between the first baffle 4111 and the second baffle 4112 and the stator coils on the stator assembly 2, and a gap should be reserved between the annular pressure plate 4113 and the stator teeth on the stator assembly 2, to meet the discharge safety distance. In addition, the first seal 412 is disposed between the stator assembly 2 and the inner wall of the first sealing cavity; that is, the first seal 412 fills the gap between the stator assembly 2 and the sealing housing 411.

[0052] Reference Figure 6 , Figure 7 and Figure 8 In this embodiment, the rotor assembly 3 includes a yoke 31 and permanent magnets 32. The yoke 31 is continuously arranged along the circumference of the rotor assembly 3. Along the radial direction of the rotor assembly 3, the permanent magnets 32 are disposed on the outer side of the yoke 31, and multiple permanent magnets 32 are spaced apart along the circumference of the rotor assembly 3. The second sealing structure 42 includes a second sealing member 421. Along the radial direction of the rotor assembly 3, the second sealing member 421 covers the outer side of the yoke 31 and covers the permanent magnets 32 located on the outer side of the yoke 31. Here, the permanent magnets 32 are used to provide an excitation magnetic field, and the yoke 31 serves as a path for magnetic flux, used to efficiently transmit the magnetic field generated by the permanent magnets 32 to the air gap. At the same time, the yoke 31 also serves as a structural support for the permanent magnets 32, used to fix the permanent magnets 32. The second sealing element 421 covers the outer side of the magnetic yoke 31 and the permanent magnet 32 ​​located on the outer side of the magnetic yoke 31. On the one hand, it can fill the gap between the permanent magnet 32 ​​and the magnetic yoke 31 to form a gapless sealing layer, thereby achieving a better sealing effect. On the other hand, the second sealing element 421 can improve the bonding force between the permanent magnet 32 ​​and the magnetic yoke 31, thereby reducing the displacement or detachment of the permanent magnet 32 ​​due to centrifugal force and improving the structural reliability of the rotor assembly 3.

[0053] In this embodiment, the second seal 421 may take many forms. For example, the second seal 421 may be potting compound or silicone rubber. This embodiment does not limit the form of the seal.

[0054] In this embodiment, when the second seal 421 is a potting compound, the first seal 412 can be an epoxy resin potting compound, a polyurethane potting compound, or a silicone potting compound. Furthermore, when providing the second seal 421, refer to... Figure 9 A potting mold 8 can be used to form a potting space on the outer side of the magnetic yoke 31. The potting mold 8 has an injection hole 821 for injecting the second seal 421. Specifically, the potting mold 8 includes a potting body 81 and a potting cover plate 82. Along the axial direction of the rotor assembly 3, the potting body 81 and the potting cover plate 82 are respectively fixed to opposite sides of the magnetic yoke 31 to form a potting space together with the outer surface of the magnetic yoke 31. The injection hole is provided on the potting cover plate 82.

[0055] In this embodiment, the second sealing structure 42 further includes a moisture-proof coating that covers the remaining sides of the magnetic yoke 31, i.e., the remaining sides excluding the outer side of the magnetic yoke 31. This results in several advantages: firstly, the moisture-proof coating is relatively thin, minimizing its impact on the magnetic circuit continuity of the magnetic yoke 31; secondly, the processing technology for the moisture-proof coating is simple, reducing costs.

[0056] Reference Figure 2 , Figure 4 and Figure 5In this embodiment, the base 1 includes a bearing assembly 13 and a rotating shaft 14. The bearing assembly 13 includes a bearing mounting structure 131 and a bearing 132. The bearing mounting structure 131 has a bearing mounting cavity 13111 and a shaft hole 13121 communicating with the bearing mounting cavity 13111. The bearing 132 is installed in the bearing mounting cavity 13111. The rotating shaft 14 is rotatably connected to the bearing 132 via the shaft hole 13121. The rotor assembly 3 is rotatably disposed inside the stator assembly 2 via the rotating shaft 14. The generator also includes a second sealing assembly 5 disposed between the rotating shaft 14 and the shaft hole 13121. The second sealing assembly 5 includes a third sealing structure 51 and a fourth sealing structure 52, which are spaced apart along the axial direction of the rotating shaft 14. Here, the rotor assembly 3 is rotatably connected to the bearing assembly 13 of the base 1 via the rotating shaft 14, so that the rotor assembly 3 can rotate relative to the base 1. The bearing mounting structure 131 has a bearing mounting cavity 13111 and a shaft hole 13121 communicating with the bearing mounting cavity 13111. The bearing 132 is installed in the bearing mounting cavity 13111, and the rotating shaft 14 is rotatably connected to the bearing 132 via the shaft hole 13121. The generator also includes a second sealing assembly 5 disposed between the rotating shaft 14 and the shaft hole 13121. Here, the bearing 132 in the bearing mounting cavity 13111 can support the rotating shaft 14 and reduce friction and wear between the rotating shaft 14 and the base 1. The second sealing assembly 5 is disposed between the rotating shaft 14 and the shaft hole 13121, and can seal the bearing 132 in the bearing mounting cavity 13111. On the one hand, it can prevent liquid from entering the bearing mounting cavity 13111 through the gap between the rotating shaft 14 and the shaft hole 13121, which would cause corrosion of the bearing 132. It can also prevent liquid from washing away the grease or oil of the bearing 132, resulting in dry friction. On the other hand, it can prevent mud, sand, and microorganisms (such as barnacle larvae) in the water from entering the bearing mounting cavity 13111 through the gap between the rotating shaft 14 and the shaft hole 13121, which would accelerate the wear of the raceway of the bearing 132. The second sealing assembly 5 includes a third sealing structure 51 and a fourth sealing structure 52, which are spaced apart along the axial direction of the rotating shaft 14. Here, the third sealing structure 51 and the fourth sealing structure 52 together form a segmented sealing protection. Along the direction close to the bearing mounting cavity 13111, the liquid pressure on the corresponding sealing structure gradually decreases, thereby improving the pressure resistance of the second sealing assembly 5. After testing, the protective structure formed by the third sealing structure 51 and the fourth sealing structure 52 can meet the requirement of pressure resistance in water depths exceeding 30m.

[0057] In the embodiments of this application, reference is made to Figure 1 , Figure 2 and Figure 6The generator also includes an impeller 6, which is connected to the rotor assembly 3. Here, the impeller 6 is a rotary power capture structure that directly withstands the impact of the liquid. Through specially designed blades 61, it can convert the kinetic or potential energy of the liquid into mechanical energy, thereby driving the rotor assembly 3 to rotate and generate electricity.

[0058] In one possible embodiment of this application, the impeller 6 can be a bidirectional impeller. In this way, when the liquid direction is reversed (such as during tidal fluctuations or switching between pumped storage conditions), the same rotation direction can still be maintained, thereby continuously driving the rotor assembly 3 to rotate and generate electricity.

[0059] Reference Figure 6 and Figure 7 In this embodiment of the application, the impeller 6 may include a hub 62 and blades 61 connected to the hub 62. Along the radial direction of the stator assembly 2, one end of the blade 61 may be connected to the hub 62, and the other end of the blade 61 may be connected to the inner side of the rotor assembly 3 to serve as a support for the rotor assembly 3.

[0060] Reference Figure 6 and Figure 7 In this embodiment, the hub 62 may further include an inner hub sleeve 621 and an outer hub sleeve 622. The outer wall of the inner hub sleeve 621 has a protruding structure, and the inner wall of the outer hub sleeve 622 has a groove structure that fits and engages with the protruding structure, so that the outer hub sleeve 622 and the inner hub sleeve 621 are engaged and fixed. Furthermore, the inner hub sleeve 621 is coaxially connected to the rotating shaft 14 on the base 1 via a key.

[0061] Reference Figure 7 In this embodiment of the application, to improve the service life of the rotating shaft 14, a wear-resistant layer 15 (such as a hard chrome layer, ceramic coating, etc.) can be provided at the mating point between the rotating shaft 14 and the shaft hole 13121. Furthermore, the Rockwell hardness value of the surface of the wear-resistant layer 15 can be greater than or equal to 45, and the thickness of the wear-resistant layer 15 can also be greater than or equal to 0.3 mm. Alternatively, a wear-resistant bushing can be provided at the mating point between the rotating shaft 14 and the shaft hole 13121; however, this embodiment of the application does not impose any limitations on this.

[0062] In this embodiment of the application, in order to reduce the coefficient of friction between the second sealing component 5 and the rotating shaft 14, an oil injection hole can be provided between the second sealing component 5 and the rotating shaft 14 for injecting lubricant.

[0063] In this embodiment, the bearing mounting structure 131 can have various structural forms. For example, the bearing mounting structure 131 may include a bearing 132 seat, which can be an integral structure. The bearing 132 seat has a bearing mounting cavity 13111 and a shaft hole 13121. (Refer to...) Figure 4 and Figure 5In another possible embodiment of this application, the bearing mounting structure 131 includes a first seat 1311 and a second seat 1312. The first seat 1311 has a bearing mounting cavity 13111. Along the axial direction of the rotating shaft 14, the bearing mounting cavity 13111 has a second opening 13112. The second seat 1312 has a shaft hole 13121, and the second seat 1312 is disposed in the second opening 13112 so that the shaft hole 13121 communicates with the bearing mounting cavity 13111. Here, the bearing mounting structure 131 includes a first seat 1311 and a second seat 1312, that is, the bearing mounting structure 131 is a split structure. The bearing 132 is installed in the bearing mounting cavity 13111 of the first seat 1311, and the third sealing structure 51 and the fourth sealing structure 52 are installed in the shaft hole 13121 of the second seat 1312. During assembly, the bearing 132 and the second sealing assembly 5 can be assembled independently, which helps to improve the assembly efficiency of the generator. During disassembly and assembly, the separable design of the first housing 1311 and the second housing 1312 allows the bearing 132 and the second sealing assembly 5 to be disassembled and assembled separately, improving the convenience of generator maintenance.

[0064] Reference Figure 4 and Figure 5 In this embodiment, a flange 13122 can be provided on the inner wall of the shaft hole 13121 of the second housing 1312 to divide the shaft hole 13121 into a first segment and a second segment along the axial direction of the rotating shaft 14. A third sealing structure 51 and a fourth sealing structure 52 are respectively disposed in the first and second segments. Here, the flange 13122 divides the inner cavity of the shaft hole 13121 into two independent segments, and the third sealing structure 51 and the fourth sealing structure 52 are arranged in different segments to form a series sealing defense line. If the sealing structure in one segment fails, the sealing structure in the other segment can still intercept the medium, improving the generator's sealing performance.

[0065] Reference Figure 4 and Figure 5 In this embodiment of the application, in order to improve the sealing effect on the bearing mounting cavity 13111, a first sealing ring 135 and a second sealing ring 136 are provided between the first seat 1311 and the second seat 1312.

[0066] In this embodiment, the opening of the shaft hole 13121 of the second seat 1312 can be chamfered to prevent the third sealing structure 51 and the fourth sealing structure 52 from being scratched by sharp edges when installed in the shaft hole 13121, thereby affecting the sealing performance of the third sealing structure 51 and the fourth sealing structure 52. Additionally, when the rotating shaft 14 is a stepped shaft, the shoulder of the rotating shaft 14 can also be rounded to prevent damage to the third sealing structure 51 and the fourth sealing structure 52 when mating with the rotating shaft 14.

[0067] Reference Figure 4 and Figure 5 In this embodiment, the bearing mounting structure 131 further includes a first sealing cover 133. The first sealing cover 133 has a mounting hole through which the rotating shaft 14 passes. The first sealing cover 133 is disposed at one end of the shaft hole 13121 facing away from the first seat 1311. Here, the first sealing cover 133 is disposed at one end of the shaft hole 13121 facing away from the first seat 1311, which can prevent dust, mud, etc. from entering the shaft hole 13121, thereby reducing the probability of wear failure of the bearing 132 and the second sealing assembly 5.

[0068] Reference Figure 4 and Figure 5 In this embodiment, a second sealing ring 136 is provided between the first sealing cover 133 and the end face of the shaft hole 13121. Thus, along the axial direction of the stator assembly 2, the second sealing ring 136 forms a static sealing structure, and the second sealing assembly 5 forms a dynamic sealing structure, further improving the sealing effect on the bearing mounting cavity 13111.

[0069] In this embodiment, the bearing mounting cavity 13111 further has a third opening 13113. Along the axial direction of the shaft 14, the third opening 13113 is located on the side of the bearing mounting cavity 13111 facing away from the second opening 13112. The bearing mounting structure 131 also includes a second sealing cover 134 disposed at the third opening 13113. Thus, when the bearing mounting cavity 13111 requires maintenance, only the second sealing cover 134 needs to be opened for passage, avoiding disassembly of the shaft 14 and improving the maintainability of the generator.

[0070] In this embodiment, the side of the second sealing cover 134 facing away from the first seat 1311 can be a flat surface or an arc-shaped surface; this embodiment does not impose any limitation. (Refer to...) Figure 1 In one possible embodiment of this application, the side of the second sealing cover 134 facing away from the first seat 1311 is a conical surface. This reduces the resistance to liquid flow and the vortex phenomenon formed when the liquid flows through this area, thereby helping to stabilize the flow field and playing a certain role in converging the flow.

[0071] Reference Figure 4 and Figure 5 In this embodiment of the application, in order to improve the sealing effect on the bearing mounting cavity 13111, a fourth sealing ring 138 and a fifth sealing ring 139 are provided between the second sealing cover 134 and the first seat 1311.

[0072] Reference Figure 4 and Figure 5In one possible embodiment of this application, the third sealing structure 51 includes a first skeleton oil seal 511 and a second skeleton oil seal 512. Along the axial direction of the rotating shaft 14, the sealing lips of the first skeleton oil seal 511 and the second skeleton oil seal 512 are arranged in opposite directions. In this way, the first skeleton oil seal 511 and the second skeleton oil seal 512 can form a bidirectional seal along the axial direction of the rotating shaft 14, which can prevent the leakage of lubricating oil in the bearing mounting cavity 13111 and prevent external contaminants from entering the bearing mounting cavity 13111. At the same time, this design can balance the pressure distribution, reduce the wear of the sealing lip on one side, and adapt to the forward and reverse rotation, vibration and eccentric conditions of the rotating shaft 14, significantly improving the reliability and service life of the third sealing structure 51.

[0073] In this embodiment, the fourth sealing structure 52 may have various structural forms. For example, the fourth sealing structure 52 may include an O-ring, a lip seal, or a magnetohydrodynamic sealing structure. This embodiment does not limit these aspects.

[0074] Reference Figure 4 and Figure 5 In one possible embodiment of this application, the fourth sealing structure 52 is disposed on the side of the third sealing structure 51 facing away from the bearing 132. The fourth sealing structure 52 includes a lip seal ring 521, the sealing lip of which extends toward the side facing away from the third sealing structure 51. Here, the fourth sealing structure 52 is disposed on the side of the third sealing structure 51 facing away from the bearing 132, and the sealing lip of the lip seal ring 521 extends toward the side facing away from the third sealing structure 51. On the one hand, this can share the pressure on the side of the third sealing structure 51 facing away from the bearing 132, thereby smoothing the pressure gradient along the axial direction of the shaft hole 13121 and reducing the risk of sealing failure of the second sealing assembly 5. On the other hand, the cavity between the third sealing structure 51 and the fourth sealing structure 52 can retain some of the medium, forming a buffer area to balance the internal and external pressure difference and reduce instantaneous high-pressure impact.

[0075] In this embodiment, the number of sealing lips on the lip seal ring 521 can be varied. For example, the number of sealing lips on the lip seal ring 521 can be one or two. This embodiment does not limit this.

[0076] In this embodiment, the material of the lip seal 521 can be varied. For example, the material of the lip seal 521 can be nitrile rubber, silicone rubber, or polytetrafluoroethylene. This embodiment does not limit the material. In one possible embodiment, the material of the lip seal 521 can be polyurethane. In this way, the lip seal 521 can have a water lubrication effect, so that a fluid lubrication layer can be formed between the sealing lip of the lip seal 521 and the rotating shaft 14, which helps to reduce the coefficient of friction between the lip seal 521 and the rotating shaft 14.

[0077] It should be noted that, in this embodiment, the material of the lip seal 521 can be a thermoplastic material. This allows the lip seal 521 to be welded onto the rotating shaft 14, making installation quick and convenient.

[0078] In this embodiment, at least two lip seals 521 are spaced apart along the axial direction of the rotating shaft 14. Thus, at least two lip seals 521 can form at least two independent sealing lines along the axial direction of the rotating shaft 14, providing multi-layered protection against high-pressure liquids and improving the sealing effect of the fourth sealing structure 52.

[0079] In this embodiment of the application, when at least two lip seals 521 are spaced apart, refer to Figure 4 and Figure 5 Two or four lip seals 521 can be provided, and this application embodiment does not limit this.

[0080] Reference Figure 1 and Figure 2 In this embodiment, the base 1 further includes a flow guide shroud 7 installed at the first opening 12. The radial dimension of the flow guide shroud 7 gradually increases along the direction away from the opening. In this way, when liquid passes through the flow guide shroud 7, a suction effect is generated inside the mounting cavity 11, allowing more liquid to flow into the mounting cavity 11, thereby accelerating the liquid flow and improving the energy harvesting efficiency of the generator.

[0081] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A generator characterized by, include: A base having a mounting cavity and a first opening for communicating with the outside; A stator assembly, the stator assembly being fixed within the mounting cavity; The rotor assembly is rotatably disposed inside the stator assembly along the radial direction of the stator assembly, and the rotor assembly is coaxially disposed with the stator assembly. A first sealing assembly, comprising a first sealing structure and a second sealing structure, wherein the first sealing structure covers the surface of the stator assembly and the second sealing structure covers the surface of the rotor assembly, and the first sealing structure and the second sealing structure are spaced apart along the radial direction of the stator assembly to form an air gap, the air gap being in communication with the first opening.

2. The electric generator of claim 1, wherein, The first sealing structure includes a sealing housing and a first sealing element. The sealing housing is disposed on the base to form a first sealing cavity together with the base. The stator assembly is located in the first sealing cavity, and the first sealing element fills the space between the stator assembly and the inner wall of the first sealing cavity.

3. The electric generator of claim 1, wherein, The rotor assembly includes a yoke and permanent magnets. The yoke is continuously arranged along the circumference of the rotor assembly. Along the radial direction of the rotor assembly, the permanent magnets are disposed on the outer surface of the yoke, and multiple permanent magnets are spaced apart along the circumference of the rotor assembly. The second sealing structure includes a second seal along the radial direction of the rotor assembly, the second seal covering the outer side of the yoke and covering the permanent magnet located on the outer side of the yoke.

4. The electric generator of any one of claims 1-3, wherein, The base includes a bearing assembly and a rotating shaft. The bearing assembly includes a bearing mounting structure and a bearing. The bearing mounting structure has a bearing mounting cavity and a shaft hole communicating with the bearing mounting cavity. The bearing is mounted in the bearing mounting cavity. The rotating shaft is connected to the bearing through the shaft hole. The rotor assembly is rotatably disposed inside the stator assembly via the rotating shaft. The generator further includes a second sealing assembly disposed between the rotating shaft and the shaft hole. The second sealing assembly includes a third sealing structure and a fourth sealing structure, which are spaced apart along the axial direction of the rotating shaft.

5. The electric generator of claim 4, wherein, The bearing mounting structure includes a first seat and a second seat. The first seat has the bearing mounting cavity and a second opening along the axial direction of the rotating shaft. The second seat has the shaft hole and is disposed at the second opening so that the shaft hole communicates with the bearing mounting cavity.

6. The electric generator of claim 5, wherein, The bearing mounting structure further includes a first sealing cover, which has a mounting hole through which the rotating shaft passes, and the first sealing cover is disposed at one end of the shaft hole opposite to the first seat.

7. The electric generator of claim 5, wherein, The bearing mounting cavity also has a third opening along the axial direction of the shaft. The third opening is located on the side of the bearing mounting cavity opposite to the second opening. The bearing mounting structure also includes a second sealing cover disposed at the third opening.

8. The electric generator of claim 4, wherein, The third sealing structure includes a first skeleton oil seal and a second skeleton oil seal. Along the axial direction of the rotating shaft, the sealing lips of the first skeleton oil seal and the sealing lips of the second skeleton oil seal are arranged in opposite directions.

9. The electric generator of claim 4, wherein, The fourth sealing structure is disposed on the side of the third sealing structure opposite to the bearing. The fourth sealing structure includes a lip seal ring, and the sealing lip of the lip seal ring extends toward the side opposite to the third sealing structure.

10. The electric generator of claim 9, wherein, Along the axial direction of the rotating shaft, at least two lip seals are spaced apart.

Images