KR100323741B1 - Vacuum in terrupter for Vacuum contact breaker - Google Patents

Abstract

The present invention relates to a vacuum interrupter for a vacuum circuit breaker, and unlike the conventional structure of manufacturing a vacuum interrupter by primary and secondary welding operations by a vacuum furnace, it is possible to manufacture a vacuum interrupter by one step welding process. And to shorten the working time and improve the quality of the product.

The present invention comprises a fixed electrode, a movable electrode and an electrode fixed to each electrode, wherein the electrode is a vacuum interrupter composed of an electrode coil, an electrode support material, a main electrode and a contact, each of the screw holes in the fixed electrode and the movable electrode And through the holes and the main electrode, respectively, and through the screw holes through the electrode support material and the electrode coil. Vacuum interrupter for vacuum breaker.

Description

Vacuum interrupter for vacuum breaker {Vacuum in terrupter for Vacuum contact breaker}

The present invention relates to a vacuum interrupter (interrupter), which is a core part of a vacuum breaker, and more particularly, to improve the electrode structure of the vacuum interrupter, thereby reducing work processes and improving quality.

Vacuum circuit breaker is an electrical device used to protect circuit devices such as motors and transformers from accident currents in transmission and distribution lines and self-generating facilities, and according to the block protection medium, hydraulic circuit breakers, gas circuit breakers, air circuit breakers and vacuum circuit breakers. Etc.

Among the circuit breakers described above, the vacuum breaker is a breaker using excellent dielectric strength. The vacuum interrupter, which is a core component thereof, is provided with a movable electrode and a fixed electrode, and when an accident current occurs, the drive is connected to a trip mechanism of the breaker. The movable electrode is separated from the fixed electrode.

In addition, the vacuum interrupter has a horizontal magnetic field method that self-drives the arc and rotates it quickly in the circumferential direction to prevent damage to the contact due to local overheating due to the stagnation of the arc current when the contact is opened by the accidental current. There is a seed system that reduces the arc energy loss and reduces the wear of the contact by restraining it within the contact and diffusing the arc across the contact surface.

1 is a vertical cross-sectional view of a conventional vacuum interrupter, which is divided into a fixed electrode assembly, a movable electrode assembly, and a ceramic assembly.

The fixed electrode assembly is fixed to the fixed electrode rod (1), the electrode coil (2) and the contact support material (3) and the contact point (4) which is fixed to one end of the fixed electrode rod to form a fixed electrode, the opposite side of the fixed electrode And a cylindrical seal cup 6 or the like welded between the fixed side cover 5 and the fixed side cover and the ceramic 21 to maintain a vacuum.

In addition, the movable electrode assembly 11, the electrode coil 12, the contact support material 13 and the contact point 14, which are fixed to one end of the movable electrode rod to form the movable electrode, and opposite to the movable electrode rod, A fixed movable side cover 15, a cylindrical seal cup 16 welded between the movable side cover and the ceramic 22 to maintain a vacuum, and a bellows 17 to maintain airtight while enabling the movable electrode to move. And a bellows shield 18 which protects the bellows from an arc generated when the movable electrode is opened from the fixed electrode.

The fixed electrode joripchegwa movable electrode assembly as described above into the car 1 to a vacuum after the temporarily assembled on a separate jig and the welding, from the fully assembled secondarily into the vacuum in the welding is not more than 10 ^-5 Torr inside the It becomes a vacuum interrupter.

This will be described in more detail.

FIG. 2 is a cross-sectional view showing a state in which the fixed electrode assembly is temporarily assembled into a jig. The jig B has a fixed weight such that the fixed side cover 5 and the cylindrical seal cup 6 are sequentially placed on the jig A 101 and welded thereon. A jig E 105 having a predetermined weight is placed on the contact point 4 and a jig C 103 and a jig D 104 made of a ceramic material to prevent deformation of the contact point are also placed on the contact point 4. And jig F 106 are placed to complete the fixed electrode assembly.

In addition, although not shown, between the parts are easily welded when a certain temperature is applied in a vacuum to fix each part and improve the conductivity between the parts, as well as a weld washer and a welding ring to maintain airtightness. .

3 is a cross-sectional view showing a state in which the movable electrode assembly is temporarily assembled into a jig. One end of the movable electrode 11 is inserted into the hole of the jig G 107, and the remaining parts are jig B102 like the fixed electrode assembly. And jig C (103), jig D (104), jig E (105), and jig F (106), which are prefabricated, and a weld washer and a welding ring are placed between the parts.

As described above, when the fixed electrode assembly and the movable electrode assembly assembled by the jig are first put into a vacuum furnace and heated, each part is welded by a weld washer and a welding ring to form an electrode assembly. We check welding condition and vacuum leakage between parts to weld again or fail in case of vacuum leakage.

In addition, the fixed electrode assembly and the movable electrode assembly, which have passed the inspection, are totally assembled by a jig. As shown in FIG. 4, the movable electrode assembly is placed on the jig H 108, and the ceramic 21 and the main arc shield ( 23), the ceramic 22, the fixed electrode assembly and the jig I 109 are placed in this order, and then the screw 11 and the nut 111 are assembled between the jig H 108 and the jig I 109. The entire assembly is complete.

Of course, even when the vacuum interrupter is fully assembled, a welding washer of a material that is melted at a lower temperature than that of the first welding is installed between each part and the parts to maintain the airtightness of the vacuum. It enters the furnace and welding works.

However, in the conventional vacuum interrupter as described above, since the welding process by the vacuum furnace is performed twice in the first and the second time, the amount of work to be entered into the limited vacuum furnace at a time is limited, so that a large amount of work is difficult and thus productivity is reduced.

In addition, various types of jig are needed to pre-assemble each part, which makes manufacturing jig expensive and inconvenient to store and manage. Since the parts are put into the vacuum furnace with the assembled parts, much care must be taken to maintain the normal assembly state. There was much concern about outbreak.

An object of the present invention is to provide a vacuum interrupter for a vacuum circuit breaker that can reduce the two welding process once and bring the improvement of quality by ensuring the assembly stability of each component.

According to an embodiment of the present invention for achieving the above object is composed of a fixed electrode and a movable electrode and an electrode fixed to each electrode, the electrode is a vacuum interrupter consisting of an electrode coil and an electrode support material and the main electrode and contacts The screw holes are formed in the fixed electrode and the movable electrode, respectively, and screw through holes are formed in the contacts and the main electrode, respectively, and screw through holes are formed in the electrode support material and the electrode coil. There is provided a vacuum interrupter for a vacuum circuit breaker in which an electrode is assembled by inserting and fastening to a screw hole.

1 is a longitudinal cross-sectional view of a conventional vacuum interrupter

2 is a cross-sectional view of a fixed electrode assembly of a conventional vacuum interrupter

3 is a cross-sectional view of a movable electrode assembly of a conventional vacuum interrupter.

4 is a cross-sectional view of the entire assembly of a conventional vacuum interrupter

5 is a cross-sectional view of the fixed electrode assembly of the vacuum interrupter according to the present invention.

6 is a cross-sectional view of the fixed electrode shown in FIG.

7 is a cross-sectional view of the movable electrode assembly of the vacuum interrupter according to the present invention.

8 is a plan view and a front view of a main electrode according to the present invention;

9 is a plan view and a front view of a contact according to the present invention.

Explanation of symbols for the main parts of the drawings

31: fixed electrode 41: movable electrode

32,42; Electrode Coil 33,43: Electrode Support

34,44 pin 35,45 main electrode

36,46: contact 51: screw hole

52,53,54: screw through hole 55,56: screw

5 and 7 are cross-sectional views of the fixed electrode assembly and the movable electrode assembly according to the present invention.

5 is a cross-sectional view illustrating a fixed electrode assembly of a vacuum interrupter according to the present invention, wherein the fixed electrode assembly includes a fixed electrode rod 31, an electrode coil 32 constituting the fixed electrode, a contact support member 33, and a pin 34. The main electrode 35 and the contact 36, the fixed side cover 37, the cylindrical seal cup 38, etc. are comprised.

In addition, as shown in FIG. 7, the movable electrode assembly 41 includes a movable electrode rod 41, an electrode coil 42, a contact support member 43, a pin 44, a main electrode 45, and a contact 46 that constitute the movable electrode; The movable side cover 47, the cylindrical seal cup 48, the bellows 49, the bellows shield 50, etc. are comprised.

A screw hole 51 is formed in the center of the fixed electrode 31 and the movable electrode 41.

As shown in FIG. 8, screw through-holes 52 and 53 are formed in the center and the outer portion of the main electrodes 35 and 45, respectively, and in the center of the contacts 36 and 46, respectively. Similarly, the screw through hole 54 is formed.

In addition, a screw hole is formed in the electrode coils 32 and 42 so that the screw can be inserted through the holes of the pins 34 and 44, and the screw is inserted into the center portion of the contact supporting members 33 and 43. Screw through holes are formed to allow

Therefore, the pins 34 and 44 and the electrode support materials 33 and 43 are placed on the electrode coils 32 and 42 of the fixed electrode assembly and the movable electrode assembly, and the main electrodes 35 and 45 are placed thereon. After mounting, the screw 55 is inserted into the screw holes of the electrode coils 32 and 42 through the screw through holes 52 and the pins 34 and 44 of the main electrodes 35 and 45. The electrodes 35, 45, pins 34, 44, and electrode coils 32, 42 are integrally fixed, and in this state, the contacts 36, 46 are placed on the main electrodes 35, 45. The contact supporting materials 33, 43, and electrode coils 32, 42 are formed by screw holes 53 and 54 formed in each of the contacts 36 and 46 and the main electrodes 35 and 45. When the screw 56 is inserted into each of the holes formed therein, and the tip portion thereof is fastened to the screw holes 51 formed in the fixed electrode 31 and the movable electrode 41, the electrodes and the electrodes are assembled in one piece.

As described above, the fixed side cover 37 and the movable side cover 47 are fitted to each of the electrode rods while the electrodes are assembled to the fixed electrode rod 31 and the movable electrode rod 41, and the cylindrical seal cups 38 and 48 are respectively fixed. After the assembly is performed by spot welding to maintain the assembled parts even when the assembly is turned over, the ceramic 21, the main arc shield 23, the ceramic 22 and the fixed electrode assembly are placed on the movable electrode assembly as shown in FIG. 4. Put it in order and assemble it with jig, screw and nut, and the entire vacuum interrupter is assembled.

After the entire assembly of the vacuum interrupter as described above is put into a vacuum furnace and heated to a certain temperature to manufacture the vacuum interrupter is completed.

Unlike the conventional vacuum interrupter which performs the welding process in the first and second stages, the present invention can manufacture the vacuum interrupter by one welding process, thereby simplifying the manufacturing process and reducing the vacuum leakage inspection time, thereby reducing the cost of the vacuum interrupter. Unlike the conventional method in which welding material is inserted between each part during welding and pressurized by the weight of the jig, welding is performed while each part is assembled with screws, thereby improving quality due to assembly stability. Will be imported.

Claims (2)

It is composed of a fixed electrode 31, a movable electrode 41 and an electrode fixed to each of the electrodes, the electrode is an electrode coil 32, 42, electrode support material 33, 43 and the main electrode 35 ( 45) and a vacuum interrupter consisting of contacts 36 and 46, Screw holes 51 are formed in the fixed electrode 31 and the movable electrode 41, respectively, and screw through holes 53 and 54 are formed in the contacts 36, 46 and the main electrode 35, 45, respectively. In addition, the through holes are also formed in the electrode support members 33 and 43 and the electrode coils 32 and 42, and the screws 56 are inserted through the respective screw through holes to be fastened to the screw holes. A vacuum interrupter for a vacuum breaker, characterized in that the assembly. The vacuum interrupter according to claim 1, wherein the pins (34) and (44) are placed on the electrode coils (32) and (42) and the screws (55) are fastened through the holes of the pins.