WO2015071731A1

WO2015071731A1 - Solid-sealed pole

Info

Publication number: WO2015071731A1
Application number: PCT/IB2014/002407
Authority: WO
Inventors: Qingqi Chen; Lihua Bao
Original assignee: Eaton Corporation
Priority date: 2013-11-15
Filing date: 2014-11-12
Publication date: 2015-05-21
Also published as: CN104658808A; CN104658808B

Abstract

The present invention relates to a solid-sealed pole which comprises a vacuum arc extinguish chamber, a first conductive terminal and a second conductive terminal. Said vacuum arc extinguish chamber comprises a center axis, a movable conductive rod and a fixed conductive plate. Said first conductive terminal is rotationally symmetrical about said center axis. Said first conductive terminal comprises a circular ring-shaped conductive body and a circular ring-shaped conductive protruding ring attached to the lateral wall of said conductive body. Said conductive body surrounds and electrically connects to said movable conductive rod. Said conductive protruding ring has a plurality of first through-holes. Said second conductive terminal is rotationally symmetrical about said center axis. Said second conductive terminal electrically connects to said fixed conductive plate. The solid-sealed pole of the present invention is small in size and simple in structure, with high safety and reliability.

Description

Solid-sealed pole

Field of the Invention

The present invention relates to the field of electric power equipment, and particularly, to a solid-sealed pole.

Background of the Invention

In the field of middle-high voltage devices, vacuum circuit breaker is an electrical equipment which is used to control and protect electric power system. A solid-sealed pole which includes a vacuum arc extinguish chamber is the core part of a vacuum circuit breaker.

China patent publication CN201332052 Y discloses a solid-sealed pole which comprises an insulating housing, an upper support for inputting current, a vacuum arc extinguish chamber and a lower support for outputting current, a fixed contact of the vacuum arc extinguish chamber electrically connects to the upper support, a movable conductive rod of the vacuum arc extinguish chamber electrically connects to the lower support with a movable slide rod. Wherein both the upper support and lower support extend outward along a radial direction of the solid-sealed pole, such solid-sealed pole is large in size, complex in structure, and the insulating material casting of it is difficult, therefore the process of making such solid-sealed pole is quite complex. Furthermore, when a failure happens on a circuit, the solid-sealed pole will need to be taken out from the circuit. So an interface of a busbar cable and an interface of a conductor which are electrically connected with the solid-sealed pole to form a conducting loop will be exposed to and easily affected by the external environment, which will bring security risk to the operator at the same time.

Summary of the Invention

According to the above-mentioned art, a technical problem to be solved by the present invention is to provide a solid-sealed pole with small size and high safety and reliability.

To achieve the above purpose, an embodiment of the present invention provides a solid-sealed pole which comprises:

a vacuum arc extinguish chamber, said vacuum arc extinguish chamber comprises a center axis, a movable conductive rod and a fixed conductive plate;

a first conductive terminal, said first conductive terminal is rotationally symmetrical about said center axis, said first conductive terminal comprises a circular ring-shaped conductive body and a circular ring-shaped conductive protruding ring attached to the lateral wall of said conductive body, said conductive body surrounds and electrically connects to said movable conductive rod, said conductive protruding ring has a plurality of first through-holes;

a second conductive terminal, said second conductive terminal is rotationally symmetrical about said center axis and electrically connects to said fixed conductive plate.

Preferably, said pluralities of first through-holes are evenly distributed on a circumference of a circle whose center is the center of said conductive protruding ring.

Preferably, the lateral wall of said conductive body has a plurality of flowing liquid grooves in a direction around said center axis, which are one to one correspondence and intercommunicate with each of said pluralities of first through-holes.

Preferably, the lateral wall of said conductive protruding ring has one or more circular ring-shaped first coil spring installing grooves, said first conductive terminal further comprises one or more first coil springs which tightly hoop said first coil spring installing grooves.

Preferably, the lateral wall of said conductive body is an unsmoothed curved surface.

Preferably, said second conductive terminal is circular ring-shaped, the lateral wall of said second conductive terminal has one or more circular ring-shaped second coil spring installing grooves, and said second conductive terminal further comprises one or more second coil springs which tightly hoop said second coil spring installing grooves.

Preferably, said second conductive terminal has a first end face adjacent to said fixed conductive plate and a second end face remote from said fixed conductive plate, said first end face has a plurality of receiving holes, said second end face has a circular ring-shaped receiving groove, said pluralities of receiving holes and said receiving groove intercommunicate in a direction along said central axis.

Preferably, said second conductive terminal has a plurality of second through-holes in a direction around said center axis, said second through-hole has a first end opening adjacent to said fixed conductive plate and a second end opening remote from said fixed conductive plate, the perimeter of said first end opening is shorter than that of said second end opening.

The solid-sealed pole of the present invention is small in size, simple in structure, and simple in manufacturing process, with reduced partial discharge, high safety and reliability.

Brief Description of the Drawings

Below, embodiments of the present invention are described in more detail with reference to the attached drawings, wherein:

Figure 1 is a sectional view of a solid-sealed pole of a preferred embodiment of the present invention;

Figure 2 is a top view of a first conductive terminal of the solid- sealed pole shown in figure 1 ;

Figure 3 is a half sectional view of the first conductive terminal shown in figure 2;

Figure 4 is a top view of a second conductive terminal of the solid- sealed pole shown in figure 1 ;

Figure 5 is a sectional view of the second conductive terminal along a line A- A shown in figure 4;

Figure 6 is a top view of a second conductive terminal of a solid-sealed pole of another embodiment of the present invention; and

Figure 7 is a sectional view of the second conductive terminal along a line B-B shown in figure 6.

Reference symbols

1 conductive terminal 2 movable conductive rod

3 conductive protruding ring

4 coil spring

5 movable connecting block

6 vacuum arc extinguish chamber

7 coil spring

8 conductive terminal

9 fixed conductive plate

10 insulating housing

11 coil spring installing groove

12 through-hole

13 flowing liquid groove

14 knurl

15 conductive body

81 receiving groove

82 receiving hole

83 coil spring installing groove

84 bolt

85 fixing hole

86 end face

87 end face

28 conductive terminal

282 through-hole

283 end opening

284 end opening

51 coil spring

Detailed Description of the Invention

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further illustrated in detail by the specific embodiments below, with reference to the drawings.

Figure 1 is a sectional view of a solid-sealed pole of a preferred embodiment of the present invention. As shown in figure 1 , it comprises an insulating housing 10, a conductive terminal 1 arranged inside insulating housing 10, a movable connecting block 5, a vacuum arc extinguish chamber 6 and a conductive terminal 8. Arc extinguish chamber 6 has a central axis L, and is rotationally symmetrical about it. Both ends of arc extinguish chamber 6 have a movable conductive rod 2 and a fixed conductive plate 9 respectively. Arc extinguish chamber 6, whose other parts are not shown in figure 1 , is an arc extinguish chamber well known in the art. The outer circumference wall of movable conductive rod 2 of arc extinguish chamber 6 is surrounded by the substantially circular ring-shaped movable connecting block 5, and is fixed with movable connecting block 5 with a bolt and a gasket, whereby ensures the electrical connection and linkage between movable conductive rod 2 and movable connecting block 5. The lateral wall of movable connecting block 5 has three circular ring-shaped coil spring installing slots, each coil spring installing slot is equipped with a coil spring 51 , the three coil spring installing slots are tightly hooped by their corresponding coil springs 51 respectively. The lateral wall of movable connecting block 5 is coaxially surrounded by the substantially circular ring-shaped conductive terminal 1, whose inside wall contacts with and electrically connects to the coil springs 1 arranged in the coil spring installing slot of movable connecting block 5, whereby realizes the electrical connection between conductive terminal 1 and movable conductive rod 2. Conductive terminal 8 is fixed with and electrically connected to fixed conductive plate 9 of arc extinguish chamber 6 with a bolt 84. In the present embodiment, conductive terminal 1 , movable connecting block 5 and conductive terminal 8 are all rotationally symmetrical about central axis L.

Figure 2 is a top view of conductive terminal 1 shown in figure 1. Figure 3 is a half sectional view of conductive terminal 1 shown in figure 2 (figure 3 is a half sectional view, with the upper right corner of the conductive terminal shown in figure 2 cut off and observed from right to left). As shown in figures 2 and 3, conductive terminal 1 comprises a conductive body 15 and a conductive protruding ring 3. Conductive body 15 is circular ring-shaped. Conductive protruding ring 3 is fixed on the lateral wall of conductive body 15, wherein the conductive protruding ring 3 is substantially circular ring-shaped and coaxial with conductive body 15. Conductive body 15 and conductive protruding ring 3 both are rotationally symmetrical about central axis L. Conductive terminal 1 may be produced by molding or by welding conductive protruding ring 3 onto the lateral wall of conductive body 15. The medial wall of conductive body 15 contacts with and electrically connects to coil springs 51 of the lateral wall of movable connecting block 5. Ten flowing liquid grooves 13 are evenly distributed on the outer circumference wall of conductive body 15 in a direction around the central axis L, each flowing liquid groove 13 is semicircle in the cross section which perpendicular to the central axis L. Ten through-holes 12 are also evenly distributed on conductive protruding ring 3 in a direction around central axis L, wherein each through-hole

12 and flowing liquid groove 13 are one to one correspondence and intercommunicated. Ten flowing liquid grooves 13 are distributed on a circumference of a circle whose center is the center of conductive body 15. Ten through-holes 12 are also distributed on a circumference of another circle whose center is the center of conductive body 15 or conductive protruding ring 3. Through-hole 12 is semicircle in cross section which perpendicular to central axis L, whereby ten circles are shown in the top view of figure 2. As shown in figure 3, the lateral wall of conductive protruding ring 3 has two circular ring-shaped coil spring installing grooves 11 which are coaxially surrounded by coil springs 4, two coil spring installing grooves 11 are tightly hooped by their corresponding coil springs 4 respectively. The lateral wall of conductive body 15 has a knurl 14. When flowing through flowing liquid grooves

13 and through-holes 12 for casting, the resin will cover the lateral wall of conductive body 15. Knurl 14 will increase the adhesion between the resin and conductive terminal 1 , whereby conductive terminal 1 will be sealed in insulating housing 10 more tightly. In the present embodiment, the circular ring-shaped coil springs 4 electrically connects to conductive body 15, and thus electrically connects to movable conductive rod 2 through movable connecting block 5, whereby coil spring 4 is an interface which electrically connects to external wires or conductors.

In other embodiments of the present invention, the solid-sealed pole may not have movable connecting block 5, and thus movable conductive rod 2 is coaxially surrounded by the conductive body 15 of conductive terminal 1 , which render the medial wall of conductive body 15 contacts with and electrically connects to movable conductive rod 2, or is electrically connected to conductive terminal 1 with a flexible connection. In other embodiments, conductive terminal 1 may be elliptical ring-shaped. The lateral wall of the conductive body 15 of conductive terminal 1 may not have flowing liquid groove 13. The number of through-holes 12 of conductive protruding ring 3 may be arbitrary, and preferably, through-holes 12 are evenly distributed on a circumference of a circle of conductive protruding ring 3. The cross section of through-holes 12 are not limited to semicircle and may be various shapes, such as circle, ellipse, square, rectangle or any other arbitrary shape. The lateral wall of conductive protruding ring 3 may have any number of coil spring installing grooves 11 , not limited to 2 as in the aforesaid embodiment. The lateral wall of the conductive body 15 of the present invention is an unsmoothed surface to increase the adhesion between the resin and conductive terminal, and is not limited to the knurl 14 as in the aforesaid embodiment.

Figure 4 is a top view of conductive terminal 8, and figure 5 is a sectional view of conductive terminal 8 along a line A-A shown in figure 4. As shown in figures 4 and 5, conductive terminal 8 is substantially circular ring-shaped and has central axis L as its rotation axis of symmetry. An inner circle of conductive terminal 8 limits fixing hole 85 which holds the screw of bolt 84. Conductive terminal 8 is fixed with and electrically connected to fixed conductive plate 9 with bolt 84 which is situated in fixing hole 85. Conductive terminal 8 has two opposing end faces, namely, one end face 86 adjacent to fixed conductive plate 9 and another end face 87 remote from fixed conductive plate 9. End face 87 has a circular ring-shaped receiving groove 81 , and end face 86 has twelve receiving holes 82 which are evenly distributed on a circumference of a circle and intercommunicate with receiving groove 81 in a direction along central axis L. As shown in figure 4, the cross section of receiving hole 82 is a circle and the difference subtracting the inradius from the exradius of receiving groove 81 (i.e., the ring width of receiving groove 81) is longer than the diameter of receiving hole 82. After the resin casting of insulating housing 10, receiving groove 81 and receiving hole 82 are filled with insulating resin which prevents conductive terminal 8 from moving in a direction away from fixed conductive plate 9, whereby conductive terminal 8 is fixed with and electrically connected to fixed conductive plate 9. Thus, conductive terminal 8 and fixed conductive plate 9 may be fixed together without or not be limited to bolt 84. Any fixing approach may be used to achieve electrically connection between conductive terminal 8 and fixed conductive plate 9. The lateral wall of conductive terminal 8 has a circular ring-shaped coil spring installing slot 83. Coil spring installing slot 83 is tightly hooped by coil spring 7, whereby coil spring 7 is electrically connected to fixed conductive plate 9.

In other embodiments of the present invention, the number of the receiving holes 82 of end face 86 may be arbitrary, and preferably, receiving holes 82 are evenly distributed on a circumference of a circle of end face 86. The cross section of receiving holes 82 may be in any arbitrary shape.

Figure 6 is a top view of conductive terminal 28 of another embodiment of the present invention. Figure 7 is a sectional view of conductive terminal 28 along a line B-B shown in figure 6. As shown in figures 6 and 7, conductive terminal 28 is very similar to conductive terminal 8, with the difference that conductive terminal 28 has twelve through-holes 282 running through its two end faces and being evenly distributed on a circumference of a circle whose center is the center of the conductive terminal 28 itself. The accommodation space limited by through-hole 282 is in truncated cone shape, and each through-hole 282 has one end opening 283 adjacent to fixed conductive plate 9 and another end opening 284 remote from fixed conductive plate 9, wherein the diameter of the end opening 283 is shorter than that of the end opening 284. After the resin casting of insulating housing 10, through-holes 282 are filled with insulating resin which prevents conductive terminal 28 from moving in a direction away from fixed conductive plate 9, which further fixes conductive terminal 28. In other embodiment, the shape of the accommodation space limited by through-hole 282 in cross section perpendicular to central axis L may be arbitrary, namely, end opening 283 and end opening 284 may be in any arbitrary shape. The perimeter of end opening 284 preferably is longer than that of end opening 283.

Insulating housing 10 is produced by casting insulating material (for example resin, or other insulating materials) in the present invention. During the process of resin casting, liquid resin flows from flowing liquid grooves 13 and through-holes 12 of conductive terminal 1, around arc extinguish chamber 6, and finally through the receiving hole 82 and receiving groove 81 of conductive terminal 8, whereby arc extinguish chamber 6 is solid-sealed in the interior of insulating housing 10, and the influence of external environment on arc extinguish chamber 6 is minimized. In such a processed solid-sealed pole, only the lateral wall of conductive protruding ring 3, coil spring 4, the lateral wall of conductive terminal 8 and coil spring 7 are exposed to the outside of insulating housing 10 and are not enclosed by it, whereby ring-shaped coil spring 4 and coil spring 7 are interfaces which electrically connect to external cables and conductors, respectively. In other embodiments, the solid-sealed pole may not have coil spring 4 and coil spring 7, and thus the lateral wall of conductive protruding ring 3 and that of conductive terminal 8 may electrically connect to external cables and conductors directly and form a conducting loop.

Conductive terminal 1 , arc extinguish chamber 6 and conductive terminal 8 in the present invention are arranged in a coaxial manner, which makes the process of insulating material casting simple. The processed solid-sealed pole is cylindrical and simple shaped. Comparing with the prior art, the volume of the solid-sealed pole is effectively reduced, and when the solid-sealed pole is energized, the partial discharge is reduced, the puncture voltage is increased and the reliability is improved.

Although the present invention has been described with preferred embodiments, but the present invention is not limited to the embodiments described herein. And the features and operation of the invention as described is susceptible to various modifications and alterations, without departing from the scope of the invention.

Claims

1. A solid-sealed pole, characterized in that it comprises:

2. The solid-sealed pole according to claim 1, characterized in that said pluralities of first through-holes are evenly distributed on a circumference of a circle whose center is the center of said conductive protruding ring.

3. The solid-sealed pole according to claim 2, characterized in that the lateral wall of said conductive body has a plurality of flowing liquid grooves in a direction around said center axis, which are one to one correspondence and intercommunicate with each of said pluralities of first through-holes.

4. The solid-sealed pole according to any one of the claim 1 to 3, characterized in that the lateral wall of said conductive protruding ring has one or more circular ring-shaped first coil spring installing grooves, said first conductive terminal further comprises one or more first coil springs which tightly hoop said first coil spring installing grooves.

5. The solid-sealed pole according to any one of the claim 1 to 3, characterized in that the lateral wall of said conductive body is an unsmoothed curved surface.

6. The solid-sealed pole according to claim 1, characterized in that said second conductive terminal is circular ring-shaped, the lateral wall of said second conductive teraiinal has one or more circular ring-shaped second coil spring installing grooves, and said second conductive terminal further comprises one or more second coil springs which tightly hoop said second coil spring installing grooves.

7. The solid-sealed pole according to claim 6, characterized in that said second conductive terminal has a first end face adjacent to said fixed conductive plate and a second end face remote from said fixed conductive plate, said first end face has a plurality of receiving holes, said second end face has a circular ring-shaped receiving groove, said pluralities of receiving holes and said receiving groove intercommunicate in a direction along said central axis.

8. The solid-sealed pole according to claim 6, characterized in that said second conductive terminal has a plurality of second through-holes in a direction around said center axis, said second through-hole has a first end opening adjacent to said fixed conductive plate and a second end opening remote from said fixed conductive plate, the perimeter of said first end opening is shorter than that of said second end opening.