JPS5917065Y2 - Patshua type gas shield disconnector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a buffer type gas breaker, and particularly to a gas breaker equipped with a buffer chamber suitable for use with large currents.

FIG. 1 shows a sectional view of a breaker in a breaker of a conventional buffer type gas breaker.

However, the end section is placed in a container filled with arc-extinguishing gas.

In Fig. 1, 1 is a fixed contact, 2 is a fixed screw I/N, 3 is a current collector, and 4 is a spring that provides contact force, and these are electrically insulated from the above description. There is.

The pin 5 is connected to an operating device (not shown) and operates in the left-right direction as shown in the drawing.

A shaft 6, a buffer cylinder 7, a movable contact 8, an insulating nozzle 9, etc. are connected to the pin 5 and operate as one.

That is, when the pin 5 is moved to the left in the drawing, the fixed contact 1 and the movable contact 8 come into contact and an electrical path is formed.

Reference numeral 10 represents a spring that applies contact force, and reference numeral 11 represents a nozzle holder that holds down the insulating nozzle 9 and the buffer cylinder 7.

In the breaking operation, the pin 5 is driven rightward in the drawing by an operating device (not shown) to separate the fixed contact 1 and the movable contact 8.

The arc A generated at this time is caused by the buffer chamber 14 formed by the fixed piston 2 and the buffer cylinder 7 being compressed as the movable contact 8 is released, and the resulting pressure being
l), Spray in direction C to extinguish arc A and complete the breaker.

At this time, the gas flow in the C direction is discharged from the exhaust hole 15 as indicated by the arrow d.

The shaft 6 and the buffer cylinder 7 are usually manufactured as a single piece, and the material used for the shaft 6 is aluminum, which has excellent electrical conductivity and is required to be lightweight since it is a moving part.

Since the gas flow C is ionized high-temperature gas immediately after touching the arc, arc-resistant metal is used for the tip 16 of the fixed contact 1 and the movable contact 8, and a heat-resistant member is installed inside the shaft 6. 17 (Japanese Patent Application No. 14836) to prevent damage caused by arc or high temperature gas.

However, as the capacity of the power transmission system increases, the short circuit current increases more and more, and the pressure in the buffer chamber 14 has to be increased in order to improve the cutoff performance.

In such a breaker, the exhaust hole 15 of the shaft 6
Thermal stress due to the high temperature gas and mechanical stress due to the reaction force due to the buffer chamber pressure are simultaneously applied to the portion.

The area of the exhaust hole 15 is determined by the size sufficient to cut off a large current and the mechanical strength of the shaft 6.
If the large current is cut off many times, the exhaust hole 15 will be damaged by the high temperature gas and its mechanical strength will be weakened.

If the cutting operation is continued in this state, there is a risk that the shirt l-6 will be cut and a serious accident will occur.

The purpose of the present invention is to provide a highly reliable buffer type breaker by preventing damage to the exhaust hole 15 portion.

The present invention is characterized in that the surface of the exhaust hole that comes into contact with high-temperature gas is covered with a heat-resistant member.

FIG. 2 shows a part of the shaft 6 in an embodiment of the present invention.

That is, a heat-resistant member (for example, F
e, Cu, cu-=w, tetrafluoroethylene resin, etc.)2
By providing 0, the shaft 6 can be protected from high temperature gas.

The heat-resistant member 17 is formed as shown in FIG. 3, and is divided into 20a and 20b as shown in FIG. They are sandwiched between the shaft 6 and the arc-proof member 17 and are individually determined by utilizing the difference in diameter between d1 and d2.

The arc-resistant member 17 is cylindrical and has an opening at a portion corresponding to the exhaust port 15, and the heat-resistant member 20 covers the surface of the shaft 6 near the exhaust port 15 to protect the shaft 6 from high-temperature gas. There is.

This heat-resistant member 20 may be formed into four parts in the circumferential direction.

If the heat-resistant member 20 is divided into a plurality of parts in the circumferential direction of the hollow shaft 6 in this way, gaps will be formed between the divided parts.

This gap cannot be left as is, since the inner surface of the hollow shaft, where the exhaust gases divert, will be most damaged.

Also, consideration must be given to supporting the divided heat-resistant members.

In this regard, as can be seen from FIGS. 2 and 4, a cylindrical heat-resistant member 17 is inserted inside the heat-resistant member 20.

Therefore, the heat-resistant member 20 can be fixed between the heat-resistant member 17 and the inner surface of the hollow shirt l-6, and at the same time, as shown in FIG.
7, and the purpose of the present invention is achieved.

The cylindrical heat-resistant member 17 has holes corresponding to the exhaust ports 15, so that the flow of exhaust gas is not obstructed.

As described above, according to the present invention, when protecting the exhaust port from exhaust gas using the divided heat-resistant member, the cylindrical heat-resistant member is inserted and fixed into the straight part of the hollow shaft.
With a simple fixing structure, damage to the hollow shaft can be minimized, and the gap between the divided parts of the heat-resistant member of the exhaust port can be protected from exhaust gas.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the breaker of the breaker section showing the conventional example, Fig. 2 is a partially enlarged sectional view showing the embodiment of the present invention, and Fig. 3
The figure is a perspective view of the arc-resistant member used in this project, and Figure 4 is a perspective view of the arc-resistant member used in this project.
It is a BB' cross-sectional view of the figure. 1... Fixed contact, 8... Movable contact, 14...
Buffer chamber, 9... Insulating nozzle, 7... Buffer cylinder = 6... Shaft, 2... Fixed piston, 1
5... Exhaust hole, 20... Heat resistant member.

Claims (1)

[Scope of utility model registration request] It has a pair of fixed and hollow movable contacts, and as the movable contacts open and close, the gas in the buffer chamber is compressed, and a part of the compressed gas obtained thereby passes through the hollow part of the movable contacts, and the piston In the buffer type gas breaker, the gas is discharged through a hollow shaft integrated with the buffer cylinder forming the buffer chamber and through an exhaust port provided at right angles to the axial direction of the hollow shaft, in the circumferential direction of the hollow shaft. A heat-resistant member divided into a plurality of parts and inserted into the exhaust port is provided, and a cylindrical heat-resistant member having an opening at a portion corresponding to the exhaust port is provided in a straight portion of the hollow shaft. The heat resistant member in the exhaust port is sandwiched and fixed between the cylindrical heat resistant member and the inner surface of the hollow shaft, and the gap between the divided parts of the heat resistant member in the exhaust port is filled with the cylindrical heat resistant member. A buffer-type gas breaker that is characterized by being blocked.