JPS5958725A - Vacuum bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vacuum breaker or vacuum contactor constructed using a contact made of a material with a significantly smaller coefficient of thermal expansion than general structural materials such as stainless steel cans. related to vacuum pulp.

[Technical background of the invention]

Conventionally, as a means to effectively utilize the contacts in vacuum pulp, a coil electrode is placed on the back of the electrode, and a strong and effective magnetic field parallel to the arc axis is generated by self-current, thereby confining the vacuum arc within the diameter of the electrode. be.

FIG. 1 shows a cross-sectional view of an example of vacuum pulp produced by this method. In the figure, the vacuum pulp I is placed between both ends of the insulating container 1a. ::I fXlt, fixed end plate 2
The vacuum container is sealed with a movable end plate 3 to form an airtight container, and the inside of the vacuum container is evacuated to a high vacuum of 10-' Torr or less. For example, the fixed electrode 4 is connected to a contact point 6 and a coil electrode 7 for generating an axial magnetic field is connected to one side of the contact point 6, and It says that the fixed shaft 8 is connected and can be connected to an external circuit.

A reinforcing member 9 is inserted into the space between the contact 6 and the coil electrode 7.

On the other hand, for example, the movable electrode 5 has contacts 10. The coil electrode 1 is connected to the back surface of the coil electrode 11, and is connected to the movable shaft 12 (T-7) to the external circuit. (furthermore, the movable shaft 12
A metal bellows 14 is provided in conjunction with an external operating device (not shown) and can be moved without reducing the degree of vacuum inside the vacuum valve 1, and a bellows cover 15 is provided for the purpose of protecting the metal bellows 4. Furthermore, the electrode 4,
In order to prevent the internal dielectric strength of the insulating container 1a from decreasing due to the gold FA vapor surrounding the insulating container 1a and generated from between the λ
A vacuum valve with a vertical magnetic field electrode structure configured in this way is conventionally used mainly for large-capacity vacuum breakers. electrodes 7,1
1 can provide sufficient mechanical strength, reinforcing parts 9, 13, contacts 6, 10 and fixed shaft 8. Even if the electrode 4.degree. 5 is not connected to the movable shaft 12 by brazing or the like, the electrode 4.degree. 5 will not be significantly deformed.

[Problems with background technology]

However, in recent years, due to the miniaturization of vacuum valves, a vertical magnetic field electrode structure has been increasingly adopted in vacuum valves for small-capacity vacuum breakers and vacuum entaffers. When it comes to 2 small vacuum valves like this, the coil ° center pole 7
, 11 have sufficient mechanical strength, so reinforcing members 9, 1.7, contacts 6, 10 and fixed shaft 8 are used.
．． The electrode 4 is connected to the movable shaft 12 by a cover plate.
．． The contact points 6 and 10 of the electrodes 4 and 5 have a significantly lower coefficient of thermal expansion than membrane structure materials such as stainless steel. If it is made of small material, the reinforcing parts 9, 13 and the contacts 6, 10
During this period, it is difficult to perform the brazing properly. f
Xc, that is, the reinforcement parts A'9 and 13 are generally made of stainless steel.
It consists of general 4. IO and reinforcing members 9, 13
Since the thermal expansion coefficients of 111i1 and 111i1 are significantly different, when the two parts are brazed, a large thermal stress will occur in the joint when the temperature returns to room temperature, and this thermal stress will cause significant deformation such as warping in the normally used thin contacts. Welding performance and contacts 6. Connection with IO coil electrodes 7, 10, <1 (mechanical strength of 1.
Shadow on T etc? [Objective of the Invention] The present invention was made in consideration of the above-mentioned circumstances, and
Even if you use the 22 points of ``[The target is the thermal expansion coefficient (which is significantly smaller than general structural materials such as stainless steel ≦?i], which is significantly smaller than 1 per month''), deformation such as warping due to thermal stress should not occur. I
To provide a highly reliable vacuum valve capable of preventing significant deformation of the C electrode. [Summary of the Invention] To achieve the above object. In the present invention, in a vacuum valve in which a coil electrode is provided on the back surface of the electrode for applying an axial magnetic field to an arc column in a vacuum container, "C1 provided between the contact point of the electrode and the coil electrode" is provided. A substantially disc-shaped connecting member made of a metal material that can be plastically deformed by thermal stress is provided between the reinforcing member and the contact point, and is connected to both the contact point and the reinforcing portion I by brazing. shall be.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below.

FIG. 2 shows an example of the cross-sectional configuration of a vacuum valve according to the present invention. In the figure, the vacuum valve 1 is the insulating container 1
The openings at both ends of a are sealed by the fixed end plate 2 and the movable end plate 3 to form an airtight container, the inside of which is S: 10-' T
It is constructed by having a pair of electrodes 4 and 5 that can be freely brought into contact and separated from each other in a vacuum container that is evacuated to a high vacuum of less than orr. Both electrodes 4 and 5 are, for example, fixed electrodes 4 and have a coefficient of thermal expansion □ of l
Monthly charges below 0XIO-'def, such as tungsten (
W), molybdenum (84°)! ,)'? Copper (CU) or silver (A1
) Contacts 6 and 6 made of Fuji and sintered alloy materials
On the back side of contact 6! A coil electrode 7 for generating a magnetic field in the 1lJl direction is connected, and a fixed shaft 8 is further connected to enable connection to an external circuit. The space between the contact 6 and the coil (iπ7) has a coefficient of thermal expansion of 15
A reinforcing member 9 made of stainless steel, for example, and a connecting member J7 made of a metal material that can be plastically deformed by thermal stress, such as needle, are inserted, and the contact 6. ．Reinforcement part old 9.Fixed glaze 8
are connected by brazing.

On the other hand, for example, the movable electrode 5, like the fixed electrode 4, has a contact 10 made of a material with a thermal expansion coefficient of 10 x 10-' or less, a coil electrode 11 connected to the back surface of the contact 10, and a movable shaft 12. hν1, and in contact with the external circuit:,;,B(+:t), the space between the contact 10 and the coil electrode 11 is 2, and the hex expansion coefficient is 15X1.
A reinforcing member 13 made of a material of 0-'def/ or more, and a substantially disk-shaped contact U part old 18 made of a metal material, which can be made plastic due to thermal stress, are inserted, and the contact 10. The connecting part old 18. Movable shaft 12 is in contact with the movable shaft 12 by the husband Riroki.Furthermore, the movable shaft 12 is connected to the row section 1 mower (not shown), and the inside of the vacuum valve 1 is connected to the movable shaft 12. A metal bellows T4 that can be moved without reducing the degree of vacuum of the
A bellows cover 15 is provided to protect the metal bellows 14. Also, surrounding the electrodes 4 and 5, 'C
A shield 16 is provided to prevent the internal dielectric strength of the insulating container 1a from decreasing due to metal vapor generated between the electrodes.
There is a money provision C.

In the vacuum valve configured as described above, the contacts 6, 1
The difference in thermal expansion coefficient between 0 and reinforced 1r1s materials 9 and 13 is 5
10-'/de is extremely large, so if they were brazed directly to each other, the contacts 6 and 1 would be damaged due to thermal stress.
0 will cause deformation such as warping, but there will be a connecting part between the two (
2) through 17, 1B, the strain caused by thermal stress is absorbed by the plastic deformation T of 17, 18, ', 12; 9.I
3, it becomes possible to connect by brazing without causing deformation such as full warpage.

〔Effect of the invention〕

As explained above, according to the present invention, plasticity due to thermal stress is formed between the contact point and the reinforcing portion through a member in the form of a substantially disc-shaped contact made of a deformable metal material. 0 configured
1 contact reinforces 7<15 materials 4. Even if the material is made of a material with a coefficient of thermal expansion of 4C, which is significantly smaller than that of a general material such as stainless steel, the contact point may undergo significant deformation such as warpage. Therefore, it is possible to provide an extremely reliable vacuum valve having an electrode with small mechanical deformation and which allows all contacts to be connected by brazing.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional vacuum valve Fuji, and Fig. 2 is a diagram showing an embodiment of the present invention. , 7.11...
Coil electrode, 9, 13... Old reinforced capital, 17.18...
"X continuation 171S old.

Claims (4)

[Claims] (1) In a vacuum pulp having a coil electrode provided on the back surface of the electrode for applying an axial magnetic field to an arc column in a vacuum container, a reinforcing member provided between the contact point of the electric wire and the coil electrode. and the contact point, a substantially disc-shaped connecting member made of a metal material that can be plastically deformed by thermal stress is provided between the contact point and the reinforcing member, and is connected to both the contact point and the reinforcing member by brazing. pulp. (2) The thermal expansion coefficient of the contact point is 10 x 10-' dey
The vacuum pulp according to claim (1), which is made of the following materials. (3) Vacuum pulp according to claim (1), in which the connecting portion is made of silver. (4) The reinforcing member has a thermal expansion coefficient of 15 x 10-' d
Vacuum pulp 0 according to any one of claims (1) to (3), comprising a refractory material of ef or more