High-voltage motor three-phase wiring device

Abstract

The invention relates to the field of motor wiring, in particular to a high-voltage motor three-phase wiring device which comprises a supporting piece. The connecting assembly comprises three conductive copper bars which are arranged on the supporting piece at intervals, the conductive copper bars are U-shaped, one end of each conductive copper bar is connected with a motor lead, and the other end of each conductive copper bar is connected with a power cable; a skirt edge is integrally arranged at the position, between every two adjacent conductive copper bars, of the supporting piece, and the skirt edge is formed by integrally extending the side wall of the supporting piece in the circumferential direction. The skirt structure is arranged on the supporting piece, the creepage distance is increased and the possibility of pollution flashover accidents is reduced on the premise that the length of the supporting piece is not increased, so that the occurrence rate of the pollution flashover accidents is relatively low when the conductive copper bar is used for connecting a motor lead and a power cable of a high-voltage motor; during connection, the motor lead and the power cable are communicated through the conductive copper bar without depending on a bolt for fixing the cable to conduct electricity, so that the bolt for fixing the cable can adopt a high-strength part and is not limited by conductivity, and the possibility of thread abrasion of the bolt is reduced.

Description

Technical Field

[0001] The present invention relates to the field of motor connection, in particular to a three-phase connection device for a high-voltage motor. Background Art

[0002] High-voltage motors currently use pillar insulators as motor lead connection terminals. Because high-voltage motors operate at high currents, copper is often used for motor terminal blocks to reduce resistivity and heat generation. During routine maintenance, the thicker power cables of high-voltage motors create significant stress during installation. Repeated installation and removal of the motor power cables causes friction between the ferrule at the end of the power cable and the terminal threads. Copper terminal blocks are relatively weak, and thread wear often occurs, leading to loose connections. This in turn causes the motor terminal blocks to slip and heat up, ultimately burning out the insulation of the motor leads. In severe cases, this can cause arcing to ground, potentially leading to equipment explosion.

[0003] Conductive copper busbars are used to connect the motor leads and power cables. Since the motor leads and power cables are connected by the copper busbars, rather than relying on the bolts securing the cables for electrical conduction, these bolts can be made of higher-strength steel, addressing the aforementioned terminal wear issue. However, due to space limitations in the high-voltage motor junction box, the three copper busbars connecting the three-phase cables are located close together, resulting in a short creepage distance. In humid and contaminated environments (dust, salt, etc.), current can "crawl" along these contaminated surfaces, causing pollution flashovers (surface flashovers), tripping equipment, or even damage. Therefore, post insulators are currently used as motor lead connection terminals. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: how to optimize the three-phase wiring structure of the high-voltage motor, reduce the possibility of loose connection, and reduce the possibility of flashover accidents.

[0005] The above technical problems are solved by the following technical solutions: The present invention proposes a three-phase wiring device for a high-voltage motor, comprising a support member, which is an insulating member; a connecting assembly, which includes a conductive copper busbar, which is three and arranged at intervals on the support member, and is U-shaped, with one end of the conductive copper busbar being connected to the motor lead and the other end being connected to the power cable; wherein the support member is integrally provided with a skirt between two adjacent conductive copper buses, and the skirt is formed by an integral extension of the side wall of the support member along the circumferential direction.

[0006] In a preferred embodiment of the three-phase wiring device for a high-voltage motor of the present invention, the thickness of the skirt gradually decreases from the inner edge to the outer edge.

[0007] In a preferred embodiment of the three-phase connection device of the high-voltage motor, the support is in the shape of a round rod, three conductive copper bars are arranged along the length direction of the support in sequence, and the skirt is in the shape of a ring coaxially arranged on the side wall of the support.

[0008] In a preferred embodiment of the three-phase connection device of the high-voltage motor, the two side surfaces of the skirt are both inclined surfaces, and the slopes of the two side surfaces are the same.

[0009] In a preferred embodiment of the three-phase connection device of the high-voltage motor, the support is provided with a mounting gap, the width of the mounting gap is the same as the width of the conductive copper bar, and the conductive copper bar is detachably mounted in the mounting gap.

[0010] In a preferred embodiment of the three-phase connection device of the high-voltage motor, the two ends of the conductive copper bar are provided with mounting holes, a screw rod is arranged through the mounting holes, and a nut is threadedly connected to the screw rod.

[0011] In a preferred embodiment of the three-phase connection device of the high-voltage motor, a first limiting piece is arranged between the nut of the screw rod and the conductive copper bar, the first limiting piece is provided with a first limiting hole coaxial with the mounting hole, a first abutting portion is arranged on one side of the first limiting piece, and a first blocking portion is protruded on the conductive copper bar and abuts against the first abutting portion.

[0012] In a preferred embodiment of the three-phase connection device of the high-voltage motor, a second limiting piece is arranged on the inner wall of the conductive copper bar, the second limiting piece is provided with a second limiting hole coaxial with the mounting hole, the nut is a hexagonal nut, the shape of the second limiting hole is matched with the nut, a second abutting portion is arranged on one side of the second limiting piece, and a second blocking portion is protruded on the conductive copper bar and abuts against the second abutting portion.

[0013] In a preferred embodiment of the three-phase connection device of the high-voltage motor, a top rod is arranged between the inner walls of the two ends of the conductive copper bar.

[0014] In a preferred embodiment of the three-phase connection device of the high-voltage motor, the top rod is a hollow rod with an internal thread, and the nuts at the two ends of the conductive copper bar are coaxially fixed at the two ends of the top rod.

[0015] The beneficial effects of the present invention are as follows: by arranging a skirt structure on the support member, the creepage distance is increased and the possibility of flashover accidents is reduced without increasing the length of the support member to meet the space installation requirements of the motor junction box, so that the incidence of flashover accidents is low when the conductive copper busbar is used for high-voltage motors to connect motor leads and power cables; when connected, the motor leads and the power cable are connected through the conductive copper busbar, and do not rely on the electrical conductivity of the bolts fixing the cables, so that the bolts fixing the cables can be made of high-strength parts without being restricted by conductivity, thereby reducing the possibility of bolt thread wear and further reducing the possibility of loose connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0017] Figure 1 The figure shows the overall structure of the three-phase wiring device for a high-voltage motor according to the present invention;

[0018] Figure 2 shows a schematic structural diagram of the support member of the present invention;

[0019] Figure 3 shows a schematic structural diagram of the connection assembly of the present invention;

[0020] Figure 4 A schematic diagram showing the arrangement positions of the first and second limiting pieces on the conductive copper busbar of the present invention is shown;

[0021] Figure 5 A schematic structural diagram of the first limiting piece of the present invention is shown;

[0022] Figure 6 A schematic structural diagram of the second limiting piece of the present invention is shown;

[0023] Figure 7 A schematic diagram of the relative positions of the ejector rod and the nut of the present invention is shown. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0025] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0026] Reference Figure 1 This embodiment provides a three-phase wiring device for a high-voltage motor, comprising:

[0027] Support member 1, support member 1 is an insulating member;

[0028] The connecting component 2 includes three conductive copper bars 21 arranged at intervals on the support 1. The conductive copper bars 21 are U-shaped, and one end of the conductive copper bar 21 is connected to the motor lead 3, and the other end is connected to the power cable 4;

[0029] The support member 1 is integrally provided with a skirt 11 between two adjacent conductive copper bars 21 . The skirt 11 is formed by integrally extending the side wall of the support member 1 along the circumferential direction.

[0030] The design of the upper skirt 11 aims to increase the creepage distance and reduce the possibility of flashover accidents without increasing the length of the support member 1 to meet the space installation requirements of the motor terminal box, so as to connect the motor lead 3 and the power cable 4 through the conductive copper bus 21.

[0031] Specifically, the conductive copper busbar 21 is fixed on the support member 1, and the support member 1 is in the shape of a round rod. The three conductive copper busbars 21 are arranged in sequence along the length direction of the support member 1. The current creeps from one conductive copper busbar 21 along the side of the support member 1 to another adjacent conductive copper busbar 21, which is the creepage distance of the two adjacent conductive copper busbars 21. By coaxially surrounding the skirt 11 on the side of the support member 1 between the two adjacent conductive copper busbars 21, the current must pass through both sides of the skirt 11 when creeping, thereby extending the creepage distance of the current from one conductive copper busbar 21 to another conductive copper busbar 21, that is, extending the creepage distance, so that without increasing the length of the support member 1 to increase the layout distance of the two conductive copper busbars 21, a larger creepage distance is provided between the two conductive copper busbars 21, thereby reducing the possibility of flashover accidents.

[0032] By increasing the creepage distance and reducing the possibility of flashover accidents, the conductive copper busbar 21 can be used for high-voltage motors to connect the motor leads 3 and the power cable 4. During connection, the motor leads 3 and the power cable 4 are connected through the conductive copper busbar 21, and do not rely on the bolts fixing the cables for conductivity. Therefore, the bolts fixing the cables can be made of high-strength parts without being restricted by conductivity, thereby reducing the possibility of bolt thread wear and further reducing the possibility of loose connections.

[0033] When designing the skirt 11, it adopts a circular ring structure that is coaxially integrated on the side wall of the support member 1. In order to further increase the creepage distance, the thickness of the skirt 11 gradually decreases from the inner edge to the outer edge. Specifically, both side surfaces of the skirt 11 are inclined surfaces, and the slopes of the two side surfaces of the skirt 11 are the same. The number of skirts 11 between adjacent conductive copper buses 21 is not limited to one, and is determined according to the voltage level of the motor. For example, when the rated voltage of the motor is 10KV, the number of skirts 11 between adjacent conductive copper buses 21 is not less than five.

[0034] On the one hand, the two side surfaces of the skirt 11 are inclined, and the distance between the inner and outer edges of one side is longer than that of a straight surface, which further increases the creepage distance without increasing the outer diameter of the skirt 11; on the other hand, the two sides of the skirt 11 are inclined with the same slope, so that the overall structure of the skirt 11 is symmetrical, avoiding excessive local concentration of the electric field, improving the electric field distribution to a certain extent, and helping to reduce corona discharge and radio interference.

[0035] In some embodiments, in order to more stably install the conductive copper bus 21 on the support 1, a mounting notch 12 is provided on the support 1. The width of the mounting notch 12 is the same as the width of the conductive copper bus 21. The conductive copper bus 21 is detachably installed in the mounting notch 12. During specific installation, the back of the U-shaped conductive copper bus 21 is placed in the mounting notch 12 and is detachably fixed by screws.

[0036] In some embodiments, mounting holes 211 are provided at both ends of the conductive copper busbar 21 , screws 22 are passed through the mounting holes 211 , and nuts 23 are threadedly connected to the screws 22 .

[0037] The motor lead 3 and the power cable 4 are specifically connected through the conductive copper busbar 21 as follows: mounting holes 211 are provided on both sides of the conductive copper busbar 21, and the motor lead 3 and the power cable 4 are respectively fixed to the two side ends of the conductive copper busbar 21 by screws 22 and nuts 23, and the motor lead 3 and the wires and cables are connected through the conductive copper busbar 21.

[0038] In some embodiments, a first limiting plate 24 is provided between the nut position of the screw 22 and the conductive copper busbar 21, and a first limiting hole 241 coaxial with the mounting hole 211 is provided on the first limiting plate 24, and a first abutting portion 242 is provided on one side of the first limiting plate 24, and a first blocking portion 212 protrudes from the conductive copper busbar 21 to abut against the first abutting portion 242.

[0039] In order to facilitate connection, the existing motor lead 3 and the power cable 4 connection ends are fixed with a ring 5. When connected, the ring 5 is sleeved on the screw 22 and tightened by the nut 23. In order to prevent the connection from loosening due to motor vibration or other factors during use, a first limiting piece 24 is sleeved on the outside of the ring 5 to prevent the ring 5 from moving. Specifically, a first limiting hole 241 is provided on the first limiting piece 24. The first limiting hole 241 and the ring 5 are of the same shape and size. When connected, the first limiting piece 24 is abutted against the conductive copper bus 21, and the first limiting hole 241 is opposite to the mounting hole 21. 1. The collar 5 is placed in the first limiting hole 241. The first abutting portion 242 is provided on the first limiting piece 24. The first abutting portion 242 has a contact surface. The first blocking portion 212 protrudes from the conductive copper bus 21. The first blocking portion 212 has a contact surface. The first abutting portion 242 and the first blocking portion 212 abut against each other through the two contact surfaces. After the nut 23 presses the collar 5, the rotation of the first limiting piece 24 is restricted. In order to reduce the possibility of movement, the first limiting piece 24 and the collar 5 have the same thickness. Of course, the collar 5 can also be slightly thicker than the first limiting piece 24.

[0040] In some embodiments, in order to prevent the nut 23 from rotating due to motor vibration or other factors, improve the connection firmness, and reduce the possibility of loosening, a second limiting plate 25 is abutted against the inner wall of the conductive copper busbar 21, and a second limiting hole 251 coaxial with the mounting hole 211 is provided on the second limiting plate 25. The nut 23 is a hexagonal nut, and the shape of the second limiting hole 251 is adapted to the nut. A second abutting portion 252 is provided on one side of the second limiting plate 25, and a second blocking portion 213 protrudes from the conductive copper busbar 21 to abut against the second abutting portion 252.

[0041] The rotation of the nut 23 is limited by the second limiting piece 25 , and its working principle is the same as that of the first limiting piece 24 , which will not be repeated here.

[0042] In one embodiment provided in the present application, a top rod 26 is provided between the inner walls at both ends of the conductive copper busbar 21 .

[0043] Since the copper conductive copper busbar 21 is relatively weak, its two sides may deform outward or inward during use. When a large current passes through, severe local heating may occur, which may lead to the risk of burning or short circuit. In order to improve the overall structural strength of the conductive copper busbar 21 and reduce the possibility of deformation, a top rod 26 is provided between the two ends of the conductive copper busbar 21 to prevent the sides from deforming inward.

[0044] As an optional embodiment, in order to prevent the conductive copper busbar 21 from deforming outward, the push rod 26 is a hollow rod with an internal thread. The nuts 23 at both ends of the conductive copper busbar 21 are coaxially fixed to the two ends of the push rod 26, and the nuts 23 are fixed integrally to the ends of the push rod 26. After the screw 22 and the nut 23 are threaded together, it is equivalent to the push rod 26 being supported between the two sides of the conductive copper busbar 21 to prevent inward deformation, and pulling the two sides of the conductive copper busbar 21 together to prevent outward deformation.

[0045] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A three-phase wiring device for a high-voltage motor, characterized by: include, A support member (1), wherein the support member (1) is an insulating member; A connecting assembly (2), the connecting assembly (2) comprising three conductive copper bars (21) arranged at intervals on the support member (1), the conductive copper bars (21) being U-shaped, one end of the conductive copper bar (21) being connected to a motor lead (3), and the other end being connected to a power cable (4); The support member (1) is integrally provided with a skirt (11) between two adjacent conductive copper bars (21), and the skirt (11) is formed by integrally extending the side wall of the support member (1) along the circumferential direction.

2. The three-phase wiring device for a high-voltage motor according to claim 1, characterized in that: The thickness of the skirt (11) gradually decreases from the inner edge to the outer edge.

3. The three-phase wiring device for a high-voltage motor according to claim 2, characterized in that: The support member (1) is in the shape of a round rod, the three conductive copper bars (21) are arranged in sequence along the length direction of the support member (1), and the skirt (11) is a circular ring structure coaxially and integrally arranged on the side wall of the support member (1).

4. The three-phase wiring device for a high-voltage motor according to claim 3, characterized in that: Both side surfaces of the skirt (11) are inclined surfaces, and the slopes of the two side surfaces of the skirt (11) are the same.

5. The high-voltage motor three-phase wiring device according to claim 4, characterized in that: The support member (1) is provided with a mounting notch (12), the width of the mounting notch (12) is the same as the width of the conductive copper busbar (21), and the conductive copper busbar (21) is detachably mounted in the mounting notch (12).

6. The high-voltage motor three-phase wiring device according to claim 5, characterized in that: Both ends of the conductive copper bar (21) are provided with mounting holes (211), a screw rod (22) is passed through the mounting hole (211), and a nut (23) is threadedly connected to the screw rod (22).

7. The three-phase wiring device for a high-voltage motor according to claim 6, characterized in that: A first limiting piece (24) is provided between the nut position of the screw rod (22) and the conductive copper busbar (21); a first limiting hole (241) coaxial with the mounting hole (211) is provided on the first limiting piece (24); a first abutting portion (242) is provided on one side of the first limiting piece (24); and a first blocking portion (212) protruding from the conductive copper busbar (21) abuts against the first abutting portion (242).

8. The high-voltage motor three-phase wiring device according to claim 7, characterized in that: The inner wall of the conductive copper busbar (21) is abutted against a second limiting piece (25), the second limiting piece (25) is provided with a second limiting hole (251) coaxial with the mounting hole (211), the nut (23) is a hexagonal nut, the shape of the second limiting hole (251) is adapted to the nut, a second abutting portion (252) is provided on one side of the second limiting piece (25), and a second blocking portion (213) is protruded from the conductive copper busbar (21) and abutted against the second abutting portion (252).

9. The high-voltage motor three-phase wiring device according to claim 8, characterized in that: A top rod (26) is provided between the inner walls at both ends of the conductive copper busbar (21).

10. The high-voltage motor three-phase wiring device according to claim 9, characterized in that: The push rod (26) is a hollow rod with internal threads, and the nuts (23) at both ends of the conductive copper bar (21) are coaxially fixed to the two ends of the push rod (26).

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