Three-phase wiring terminal and split wet-type motor stator device

Abstract

The invention provides a three-phase wiring terminal and a split wet-type motor stator device, and relates to the technical field of electric pumps, and the three-phase wiring terminal comprises a wiring frame which is provided with a through assembly hole along the thickness direction, the connecting end of a copper nose is in a circular shape and is attached to the top surface of the assembly hole, and a copper column axially penetrates through the assembly hole and the copper nose from bottom to top and is connected with the wiring frame. The copper nut is in threaded connection with the end part, extending out of the wiring rack, of the copper column so as to press and fix the copper nose on the top surface of the wiring rack; an annular narrow-diameter section is arranged in the middle of the peripheral face of the copper column, the sealing ring is sleeved with the annular narrow-diameter section, an insulating support is installed on the top of the wiring frame in a buckled mode, the insulating support buckles the sealing ring inside, the top of the insulating support is sleeved with a nitrile rubber sealing ring assembly through the copper column, and the portion, extending out of the insulating support, of the copper column is further provided with a dry area fixing assembly. The technical problems of lack of stable sealing and lack of a wet-type motor matched with a suspension hydraulic system are solved, and the function of motor stator oil immersion is achieved.

Description

Technical Field

[0001] This invention relates to the field of electric pump technology, and in particular to a three-phase terminal block and a separate wet motor stator device. Background Technology

[0002] As the power source for the hydraulic suspension system, the structure of the motor stator of the suspension hydraulic electric pump affects the pump's working efficiency, heat dissipation performance, and sealing reliability.

[0003] Existing motor stators are mainly divided into two structures: integrated and split. Integrated motor stators assemble silicon steel sheets into a single unit using an injection-molded stator frame. Copper wire is wound into slots using an internal winding machine, and pre-reserved three-phase slots are used to insert pins for external interface connections. Split motor stators, on the other hand, have separate slot designs for the silicon steel sheets and the injection-molded stator frame. After winding each slot using an external winding machine, all slots are assembled into a single unit using laser welding and modular tooling. Pins are pre-molded onto a fixed bracket, and then the fixed bracket is connected to the injection-molded stator frame using hot-melt welding. The copper wire is fixed in the corresponding positions using resistance welding.

[0004] However, both existing motor stator structures lack dedicated sealing and fixing structures, making it impossible to achieve a stable seal between the motor stator and the external controller and hydraulic pump body; consequently, there is a lack of a stable wet motor structure suitable for suspension hydraulic systems. Summary of the Invention

[0005] The purpose of this invention is to provide a three-phase terminal block and a split wet motor stator device to alleviate the technical problems in the prior art, such as the lack of stable sealing, which makes it unable to adapt to the high working pressure conditions of the suspension hydraulic system, and the lack of wet motors adapted to the suspension hydraulic system.

[0006] The three-phase terminal block provided by the present invention includes: a terminal block, a copper lug, a copper post, a copper nut, a sealing ring, an insulating support, a nitrile rubber sealing ring assembly, and a dry area fixing assembly; The terminal block has three through mounting holes along its thickness direction. The connecting ends of the three copper lugs are all round. The connecting ends of the copper lugs are fitted to the top surface of the mounting holes. The copper post passes through the mounting holes and copper lugs axially from bottom to top. The copper nut is threaded to the end of the copper post that extends out of the terminal block to press and fix the copper lugs to the top surface of the terminal block. The copper column has an annular narrow diameter section in the middle of its outer circumference. The sealing ring is fitted onto the annular narrow diameter section. An insulating support is fastened to the top of the terminal block. The insulating support fastens the sealing ring inside. A nitrile rubber sealing ring assembly is fitted onto the top of the insulating support through the copper column. A dry area fixing assembly is also provided on the part of the copper column that extends out of the insulating support.

[0007] Furthermore, the nitrile rubber sealing ring assembly includes an inner sealing ring and an outer sealing ring; An inner sealing ring is installed between the hole wall of the insulating support and the outer periphery of the copper column. An annular sealing groove is opened on the outer peripheral wall of the insulating support, and the outer sealing ring is installed in the annular sealing groove.

[0008] Furthermore, the dry area fixing assembly includes an insulating gasket and a connecting nut; An insulating gasket is fitted onto the end of the copper column that extends out of the insulating support, and a connecting nut is threaded to the end of the copper column to fix the external controller.

[0009] Furthermore, the terminal block has a U-shaped groove on the side near the mounting hole, with the opening of the U-shaped groove facing outwards and used to place the wire insertion end of the copper lug.

[0010] Furthermore, the copper lugs are resistance-welded to the copper wires at the bottom of the junction box via wire insertion terminals.

[0011] Furthermore, the copper lug is soldered to the copper wire at the bottom of the junction box via a wire insertion end.

[0012] Furthermore, the joints between the copper pillar and the copper lug, and the joints between the copper pillar and the junction box, are coated with an adhesive layer.

[0013] The split wet motor stator device provided by the present invention includes the above-mentioned three-phase terminals, stator injection molded frame and silicon steel sheet; The stator injection molding frame is a ring-shaped segmented structure, and silicon steel sheets are set on the outside of the stator injection molding frame; Copper wires are wound in each segment of the stator injection molded frame, and the lead-out ends of the copper wires are welded to the copper lugs of the three-phase terminals; the terminal frame is assembled and connected to the top surface of the stator injection molded frame.

[0014] Beneficial effects: The three-phase terminal block and split wet motor stator device provided by this invention, through the assembly holes opened in the terminal block, form a corresponding assembly relationship with three copper lugs and copper posts. Combined with the fitting design of the copper lug connection end with the top surface of the assembly hole and the clamping and fixing of the copper lugs by the copper nuts, it can not only realize the positioning and connection of the three-phase conductive circuit, but also rely on the sealing ring sleeved on the annular narrow diameter section in the middle of the copper post to form a targeted seal under the clamping and wrapping action of the insulating support. Combined with the nitrile rubber sealing ring assembly on the outer side of the copper post at the top of the insulating support, a multi-seal system adapted to the wet working scenario of the suspension hydraulic electric pump is constructed, which can effectively prevent oil leakage from the gap between the terminal block and the copper post and copper lugs, ensuring the sealing and insulation of the motor stator and the hydraulic pump body. At this time, the motor stator can be immersed in oil, ensuring that the oil does not leak to the external structure (controller, hydraulic pump body), giving the motor stator the high slot fill factor characteristic of traditional motor stator structures and enabling wet operation. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a three-phase terminal block provided in an embodiment of the present invention; Figure 2 A bottom view of a three-phase terminal block provided in an embodiment of the present invention; Figure 3 A side view of a three-phase terminal block provided in an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of point AA in the side view of the three-phase terminal block provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the split wet motor stator device provided in an embodiment of the present invention.

[0017] Icons: 1-Terminal bracket; 101-U-groove; 2-Copper lug; 3-Copper post; 4-Copper nut; 5-Sealing ring; 6-Insulating support; 7-Nitrile rubber sealing ring assembly; 701-Inner sealing ring; 702-Outer sealing ring; 8-Dry zone fixing assembly; 801-Insulating gasket; 802-Connecting nut; 9-Stator injection molded frame; 10-Silicon steel sheet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] like Figures 1-5 As shown, the three-phase terminal block provided by the present invention includes: a terminal block 1, a copper lug 2, a copper post 3, a copper nut 4, a sealing ring 5, an insulating support 6, a nitrile rubber sealing ring assembly 7, and a dry area fixing assembly 8. The terminal frame 1 has three through-holes along the thickness direction. The connecting ends of the three copper lugs 2 are all round. The connecting ends of the copper lugs 2 are attached to the top surface of the mounting holes. The copper pillar 3 passes through the mounting holes and the copper lugs 2 axially from bottom to top. The copper nut 4 is threadedly connected to the end of the copper pillar 3 that extends out of the terminal frame 1 to press and fix the copper lugs 2 to the top surface of the terminal frame 1. The copper column 3 has an annular narrow diameter section in the middle of its outer circumference. The sealing ring 5 is fitted onto the annular narrow diameter section. An insulating support 6 is fastened to the top of the terminal block 1. The insulating support 6 fastens the sealing ring 5 inside. The top of the insulating support 6 is fitted with a nitrile rubber sealing ring assembly 7 through the copper column 3. A dry area fixing assembly 8 is also provided on the part of the copper column 3 that extends out of the insulating support 6.

[0026] Specifically, the terminal block 1 is a block structure made of insulating material, with three through mounting holes along its thickness direction (vertical direction). These three mounting holes correspond to the three-phase circuit of the motor, and the diameter of each mounting hole is the same. The connecting ends of the three copper lugs 2 are all circular, with a diameter slightly larger than the diameter of the mounting holes. This allows the connecting ends of the copper lugs 2 to completely cover the top opening of the mounting holes and fit tightly against the top surface of the terminal block 1. The other end of the copper lug 2 is soldered to a copper wire. The copper post 3 passes through the mounting holes of the terminal block 1 and the center hole of the connecting end of the copper lug 2 from bottom to top, with the top end of the copper post 3 extending beyond the top surface of the terminal block 1. The internal thread of the copper nut 4 matches the external thread at the top of the copper post 3. After tightening the copper nut 4 onto the protruding end of the copper post 3, the lower end face of the copper nut 4 presses and fixes the circular connecting end of the copper lug 2 to the top surface of the terminal block 1, achieving axial positioning of the copper lug 2, copper post 3, and terminal block 1.

[0027] A narrow annular section is provided in the middle of the outer circumference of the copper column 3, that is, the section where the copper column 3 passes through the assembly hole of the terminal frame 1. The diameter of the narrow section is smaller than the diameter of the upper and lower ends of the copper column 3, and the axial length of the narrow section is adapted to the thickness of the sealing ring 5. The sealing ring 5 is an elastic sealing element, which is tightly fitted on the narrow annular section and has an interference fit with the outer circumference of the copper column 3. The insulating support 6 is a cover-shaped structure, and the inner diameter of its bottom opening is adapted to the outer diameter of the top surface of the terminal frame 1. The insulating support 6 is fastened and installed on the top of the terminal frame 1 from top to bottom, and the insulating support 6 completely wraps the sealing ring 5. The lower end face of the nitrile rubber sealing ring assembly 7 is in contact with the top surface of the insulating support 6. The dry area fixing assembly 8 is sleeved on the top section of the copper column 3 that extends out of the nitrile rubber sealing ring assembly 7 to achieve fixation with the external controller.

[0028] The one-to-one correspondence between the three mounting holes and the three copper lugs 2 and copper posts 3 enables the independent separation layout of the three-phase circuit of the motor, effectively avoiding electrical interference between the three phases. At the same time, the tight fit between the circular connecting end of the copper lug 2 and the top surface of the terminal block 1, and the pressing and fixing of the copper nut 4, ensure that the conductive contact area between the copper lug 2 and the copper post 3 is sufficient and the contact pressure is stable, reducing contact resistance and improving power transmission efficiency. The through-type connection of the copper post 3 from bottom to top, combined with clearance fit and thread fixing, ensures the coaxiality of the copper post 3 with the terminal block 1 and the copper lug 2.

[0029] The insulating support 6 and the sealing ring 5 are designed to create a seal, which can prevent oil leakage from the gap between the copper column 3 and the mounting hole of the terminal block 1. The nitrile rubber sealing ring assembly 7 further fills the gap between the copper column 3 and the insulating support 6, forming a double sealing structure to ensure that the oil does not leak into the dry area when the motor stator is wet. The dry area fixing assembly 8, through the cooperation of the insulating gasket and the connecting nut, can not only achieve stable fixing with the external controller, but also ensure electrical insulation. The overall structural design fully meets the high working pressure and wet immersion oil conditions of the suspension hydraulic electric pump.

[0030] In an embodiment of the present invention, the nitrile rubber sealing ring assembly 7 includes an inner sealing ring 701 and an outer sealing ring 702; the inner sealing ring 701 is embedded between the hole wall of the insulating support 6 and the outer periphery of the copper column 3, and an annular sealing groove is formed on the outer peripheral wall of the insulating support 6, and the outer sealing ring 702 is embedded in the annular sealing groove.

[0031] The dry area fixing component 8 includes an insulating gasket 801 and a connecting nut 802; the insulating gasket 801 is sleeved on the end of the copper column 3 that extends out of the insulating support 6, and the connecting nut 802 is threadedly connected to the end of the copper column 3 to fix the external controller.

[0032] Specifically, such as Figure 4 As shown, the upper square in the figure represents the dry area, and the lower square represents the wet area. The insulating support 6, which is fastened to the top of the terminal block 1, is a cover-shaped structure made of insulating material. The inner wall of its top hole has an annular groove that matches the inner sealing ring 701. The axial position of the annular groove corresponds to the section of the copper column 3 that extends out of the insulating support 6. The inner sealing ring 701 is embedded in the annular groove, and the inner ring is press-fitted with the outer circumferential surface of the copper column 3 to achieve a seal between the inner hole of the insulating support 6 and the copper column 3. An annular sealing groove is formed in the middle of the outer circumferential wall of the insulating support 6. The outer sealing ring 702 is embedded in the annular sealing groove, and the outer circumferential surface of the outer sealing ring 702 protrudes 0.5-1 mm from the outer circumferential wall of the insulating support 6 to allow for compression when assembling with the external hydraulic pump body. In the dry area fixing assembly 8, an insulating gasket 801 is provided at the end of the copper column 3 that extends out of the top surface of the insulating support 6. The insulating gasket 801 is a circular sheet structure, and the diameter of its central hole is clearance-fitted with the outer diameter of the copper column 3. After the insulating gasket 801 is fitted onto the protruding end of the copper column 3, its bottom surface is tightly fitted with the top surface of the insulating support 6. The internal thread of the connecting nut 802 is fully adapted to the external thread at the top of the copper column 3. When the connecting nut 802 is tightened on the top of the copper column 3, its lower end face presses against the insulating gasket 801, so that the insulating gasket 801 is fixed between the connecting nut 802 and the insulating support 6. At the same time, the top plane of the connecting nut 802 is fitted with the end face of the mounting hole of the external controller. By tightening the connecting nut 802, the external controller is fixedly connected to the copper column 3 and the terminal block 1.

[0033] The inner sealing ring 701 and outer sealing ring 702 of the nitrile rubber sealing ring assembly 7 form a dual protection of inner hole sealing and outer circumferential sealing: the inner sealing ring 701 specifically blocks oil leakage from the mating gap between the copper column 3 and the inner hole of the insulating support 6, while the outer sealing ring 702 seals the assembly gap between the insulating support 6 and the external hydraulic pump body, meeting the wet operation requirements of the motor stator immersed in oil, preventing oil leakage to the external controller in the dry area, and adapting to the sealing reliability requirements of the suspension hydraulic system under high working pressure. The insulating gasket 801 of the dry area fixing assembly 8 can effectively isolate the copper column 3 (conductive component) from the external controller, preventing the risk of electrical short circuit and ensuring electrical safety; the connecting nut 802 connects the external controller to the copper column 3 and the terminal frame 1 through threaded connection to form an integrated fixing, combined with the independent fixing design of the three-phase structure corresponding to the three mounting holes, which can improve the overall structure's resistance to loosening under the vibration and pressure fluctuation conditions of the suspension hydraulic system, and reduce sealing failure or poor electrical contact caused by structural displacement.

[0034] In an embodiment of the present invention, the terminal block 1 has a U-shaped groove 101 on the side near the mounting hole. The U-shaped groove 101 opens outward and is used to place the wire insertion end of the copper lug 2.

[0035] The connection between copper pillar 3 and copper lug 2 and the connection between copper pillar 3 and terminal block 1 are coated with an adhesive layer.

[0036] Specifically, on the terminal block 1, a U-shaped groove 101 is correspondingly opened on one side of each mounting hole. The three U-shaped grooves 101 correspond one-to-one with the three mounting holes. The opening direction of the U-shaped grooves 101 is outward, and the width of the groove is adapted to the width of the wire insertion end of the copper lug 2. At the connection between the copper post 3 and the copper lug 2, that is, the mating surface of the copper post 3 passing through the central hole of the copper lug 2 connection end, and at the connection between the copper post 3 and the terminal block 1, that is, the mating surface of the copper post 3 passing through the mounting hole of the terminal block 1, a layer of adhesive is uniformly coated. Preferably, it is epoxy modified insulating adhesive. The thickness of the adhesive layer is 0.05-0.1mm, covering the entire mating gap. After the adhesive cures, the copper post 3 and the copper lug 2, and the copper post 3 and the terminal block 1 form a connection structure that has both fixing and sealing functions, and the adhesive layer does not affect the conductive contact between the copper post 3 and the copper lug 2.

[0037] In one embodiment, the copper nose 2 is resistively welded to the copper wire at the bottom of the terminal block 1 via a wire insertion end.

[0038] In another embodiment, the copper nose 2 is soldered to the copper wire at the bottom of the terminal block 1 via a wire insertion end.

[0039] Specifically, both welding embodiments are based on the precise connection between the copper lug 2 and the copper wire: the copper lug 2 is aligned with the copper wire (the copper wire led out after the motor stator is wound in sections) at the bottom of the terminal block 1.

[0040] In the first implementation method, after the copper lug 2, made of pure copper, is connected to the copper wire at the bottom of the terminal block 1 by resistance welding, the connection is achieved by resistance welding: the two electrodes of resistance welding are respectively clamped on the outside of the copper lug 2 wire insertion end and the end of the copper wire, the electrode pressure is controlled at 0.3-0.5MPa, and a welding current of 800-1200A is applied. The resistance heat at the contact point between the copper lug and the copper wire causes local metal to melt and form a weld nugget; after the welding is completed, the weld nugget cools and solidifies, and the copper lug 2 and the copper wire form an integrated conductive structure.

[0041] In the second implementation method, before soldering the wire insertion end of the copper lug 2 to the copper wire at the bottom of the connector 1, a small amount of rosin flux is applied to the soldering surface of the wire insertion end of the copper lug and the end of the copper wire. Then, lead-free solder paste is applied to the joint. A constant temperature soldering iron is used to heat the joint at a temperature of 250-300℃. After the solder paste melts, the heating is maintained for 1-2 seconds to allow the solder to fully wet the contact surface between the copper lug and the copper wire. Then, the soldering iron is removed, and the solder cools and solidifies to form a sealed solder joint.

[0042] The present invention also provides a split wet motor stator device, such as... Figure 5 As shown, it includes the three-phase terminals, stator injection-molded frame 9, and silicon steel sheet 10 of the above embodiments; The stator injection molded frame 9 is in the form of a ring segment, and silicon steel sheets 10 are set on the outside of the stator injection molded frame 9; copper wires are wound in each segment slot of the stator injection molded frame 9, and the lead-out end of the copper wires is welded to the copper lugs 2 of the three-phase terminal block; the terminal block 1 is assembled and connected to the top surface of the stator injection molded frame 9.

[0043] Specifically, the stator injection molded frame 9 adopts a ring-shaped segmented design, with each segment being an insulating injection molded part. Its outer wall has a ring-shaped insert groove adapted to the silicon steel sheet 10. The silicon steel sheet 10 is an arc-shaped structure formed by stacking multiple thin silicon steel sheets. The inner arc surface of each silicon steel sheet 10 is interference-fitted with the insert groove of the stator injection molded frame 9 segment, ensuring the silicon steel sheet 10 is tightly fixed to the outside of the stator injection molded frame 9. After assembly, the silicon steel sheets 10 together form a complete ring-shaped magnetic circuit structure. Each segment of the stator injection molded frame 9 has an axially extending winding groove on its inner sidewall. Copper wire is wound into the winding groove using an external winding process. The lead-out end of the copper wire extends from the top opening of the winding groove, and the lead-out end of the copper wire in each segment corresponds to a set of copper lugs 2 of the three-phase terminals. The terminal frame 1 of the three-phase terminals is a ring-shaped block adapted to the ring structure of the stator injection molded frame 9.

[0044] Based on the above embodiments, the installation process of the three-phase terminal block and split wet motor stator device provided by the present invention is as follows: After the stator injection-molded frame 9 and silicon steel sheet 10 are assembled into a single structure, copper wires are welded to the copper lugs 2. The copper lugs 2 with welded copper wires are then installed into the corresponding grooves of the terminal frame 1. The copper post 3 is passed through the terminal frame 1 with the copper lugs 2 from below, and the copper nut 4 is tightened from above. The sealing ring 5 is installed at the narrow diameter position of the copper post 3. The insulating support 6 is installed to the terminal frame 1, and the inner sealing ring 701 and outer sealing ring 702 are installed. The terminal frame 1 is then installed onto the assembled stator. At this point, the motor stator and the external structure (controller, hydraulic pump body) form a stable seal. The inner sealing ring 701, outer sealing ring 702, and sealing ring 5 on the insulating support 6 ensure the sealing and insulation of the motor stator and the hydraulic pump body. At this point, the motor stator can be immersed in oil, ensuring that the oil does not leak to the external structure (controller, hydraulic pump body).

[0045] Install the external structure (hydraulic pump body), insert the insulating gasket 801 into the copper column, install the external structure (controller), and tighten the connecting nut 802. At this time, the motor stator and the external structure (controller, hydraulic pump body) are stably fixed by the two connecting nuts 802.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-phase terminal block, characterized in that, include: Terminal block (1), copper lug (2), copper post (3), copper nut (4), sealing ring (5), insulating support (6), nitrile rubber sealing ring assembly (7), and dry area fixing assembly (8); The connector frame (1) has three through mounting holes along its thickness direction. The connecting ends of the three copper noses (2) are all round. The connecting ends of the copper noses (2) are attached to the top surface of the mounting holes. The copper pillar (3) passes through the mounting holes and the copper noses (2) axially from bottom to top. The copper nut (4) is threaded to the end of the copper pillar (3) that extends out of the connector frame (1) to press and fix the copper noses (2) to the top surface of the connector frame (1). The copper column (3) has an annular narrow diameter section in the middle of its outer circumference. The sealing ring (5) is fitted onto the annular narrow diameter section. The top of the wiring bracket (1) is fastened with the insulating support (6). The insulating support (6) fastens the sealing ring (5) inside. The top of the insulating support (6) is fitted with a nitrile rubber sealing ring assembly (7) through the copper column (3). The part of the copper column (3) extending out of the insulating support (6) is also provided with a dry area fixing assembly (8).

2. The three-phase terminal block according to claim 1, characterized in that, The nitrile rubber sealing ring assembly (7) includes an inner sealing ring (701) and an outer sealing ring (702). The inner sealing ring (701) is embedded between the hole wall of the insulating support (6) and the outer periphery of the copper column (3). The outer periphery of the insulating support (6) is provided with an annular sealing groove, and the outer sealing ring (702) is embedded in the annular sealing groove.

3. The three-phase terminal block according to claim 1, characterized in that, The dry area fixing assembly (8) includes an insulating gasket (801) and a connecting nut (802); The insulating gasket (801) is fitted onto the end of the copper column (3) that extends out of the insulating support (6), and the connecting nut (802) is threaded to the end of the copper column (3) to fix the external controller.

4. The three-phase terminal block according to claim 1, characterized in that, The connector (1) has a U-shaped groove (101) on the side near the mounting hole. The U-shaped groove (101) opens outward and is used to place the wire insertion end of the copper nose (2).

5. The three-phase terminal block according to claim 4, characterized in that, The copper nose (2) is resistively welded to the copper wire at the bottom of the terminal block (1) through the wire insertion end.

6. The three-phase terminal block according to claim 4, characterized in that, The copper nose (2) is soldered to the copper wire at the bottom of the connector (1) via the wire insertion end.

7. The three-phase terminal block according to claim 1, characterized in that, The connection between the copper pillar (3) and the copper nose (2) and the connection between the copper pillar (3) and the wiring frame (1) are coated with an adhesive layer.

8. A split-type wet-type motor stator assembly, characterized in that, Includes a three-phase terminal block, a stator injection-molded frame (9), and a silicon steel sheet (10) as described in any one of claims 1-7; The stator injection molding skeleton (9) is in the shape of a ring segment, and the silicon steel sheet (10) is provided on the outside of the stator injection molding skeleton (9). Copper wires are wound in each segmented slot of the stator injection molded frame (9), and the lead-out end of the copper wires is welded to the copper lug (2) of the three-phase terminal block; the terminal block (1) is assembled and connected to the top surface of the stator injection molded frame (9).

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