JPS59672Y2 - vacuum circuit breaker - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a vacuum circuit breaker.

A conventional vacuum circuit breaker is shown in FIG.

In the figure, 1 is an operating section, and this operating section 1 includes a cylinder 2,
It consists of an air operating device having a piston 3 and a piston rod 4.

Reference numeral 5 denotes a support insulator tube attached to the operating section 1; 6 refers to a cutoff section insulator tube attached to the upper part of the support insulator tube 5 via the flange portion 7a of the bearing frame 7; and 8 is housed in the cutoff section insulator tube 6. It is a fixed cutoff part (vacuum valve), and inside thereof, a fixed lead 9 having a fixed electrode 9a at its tip and a movable lead 10 having a movable electrode 10b are disposed facing each other.

Reference numeral 11 denotes a bottomed cylindrical connecting member slidably supported within the bearing frame 7, into which the lower end of the movable lead 10 is slidably fitted via a pressure spring 13. There is.

The lower end of the connecting member 11 is connected to the piston rod 4 of the operating section 1 via an insulating rod 12 inserted into the support insulator tube 5.

In addition, 14 is a bearing of the piston rod 4, 2 a, 2
b is an input air pipe and a cutoff air pipe provided in the cylinder 2.

Regarding the operation of such a conventional circuit breaker, the closing air pipe 2a
The movable electrode 10a is pressed against the fixed electrode 9a by moving the piston 3 upward by introducing air from the movable electrode 10a.

Also, by introducing air from the blocking air pipe 2b and moving the piston 3 downward, the movable electrode 10a is separated from the fixed electrode 9a.

This type of circuit breaker has problems not only with the operating section 1 itself, but also with other serious drawbacks.

That is, conventionally, the movable reed 10 is moved via the insulating rod 12, so the mass of the parts that move when turning on and off becomes large, resulting in an increase in the size of the mechanism of the operating section 1 (for example, the cylinder 2). There is a need.

Furthermore, the insulating rod 12 is also required to have mechanical strength that can withstand this, which is disadvantageous in terms of structure and cost.

In view of the above points, the present invention provides a vacuum circuit breaker that is smaller in size and lower in cost.

FIG. 2 is a sectional view showing an embodiment of the present invention.

In the figure, the same parts as in FIG. 17
Compressed air is constantly supplied into this support insulator tube 15 via a.

Reference numeral 18 denotes an air operating section disposed at the upper end of the support insulator tube 15, and the blocking section insulator tube 6 and the blocking section 8 are stacked on top of the air operating section 18 via the bearing frame 19 of the movable reed 10. There is.

This air operation unit 18 is shown in Fig. 3 (in this figure, the identification part shows the optical cross section, the movable part shows the right side of the movable part in the cut-off state on the right side with respect to the center, and the movable part in the closed state on the left side with respect to the center). The left side of the sub-section is shown.

The movable part forces the object shape relative to the center.

) As shown in detail in FIG. The auxiliary piston 18d is disposed in a hollow part 18C in the center of the air operating part 18, and the main piston 18 is disposed in a hollow part 18e formed in the upper part of the air operating part 18.
f, the main piston 18 f, a shutoff spring 18g interposed between the upper end of the air operating section 18, and the hollow section 18.
The exhaust valve 18i is disposed at the lower part of the piston e and is connected to the auxiliary piston 18d via a rod 18h.

In addition, the hollow portion 15a of the support insulator tube 15 and the main piston 18
The hollow part 18e in which the piston f is housed is communicated with the hollow part 18e through a passage 18j, and the hollow part 18e in which the auxiliary piston 18d is housed is communicated with the hollow part 18e.
The hollow part 18k formed in communication with the exhaust valve 18C is in communication with the passage 18j via the valve 18b, and the hollow part 18e is connected to the exhaust hole 18 at the exhaust valve 18i.
It communicates with 1.

Note that 18m is a small diameter exhaust hole that communicates the hollow portion 18k with the outside, 18n is a hole that connects the hollow portion 18e above the main piston 18f with the outside, and 18p is a hole that connects the hollow portion 18e with the outside. This is a spring that applies a predetermined downward force to the auxiliary piston 18d.

The movable lead 10 of the cutoff section 8 is connected to the main piston 18 f of the air operation section 18 configured in this way via a rod 21 , and the lower end of the insulating rod 20 penetrates the substrate 17 . It is connected to a link mechanism 22 disposed within the operating section 16.

This link mechanism 22 includes an operating rod 22a driven by an operating device (not shown), a lever 22C whose one end is coupled to the operating rod 22a and whose center portion is fixed to a rotating shaft 22b, and this lever. It consists of a lever 22 d that connects the other end of the rod 22 C and the insulating rod 20 .

Regarding the operation of this embodiment, when the insulating rod 20 is operated downward via the link mechanism 22 while the support insulator 15 is filled with compressed air, the valve 18a opens and the compressed air flows into the passage 18. j, flows into the hollow part 18e,
Raise the main piston 18f.

As a result, the cutoff spring 18g is loaded and the movable electrode 1
0a is pressed against the fixed electrode 9a and the closed state is maintained.

Next, when the insulating rod 20 is operated upward, the valve 18
A closes the valve 18, b opens the other way, and at this time the hollow part 18
Air flowing backward through the passage 18j flows into the hollow portion 18k, raises the auxiliary piston 18d against the spring 18p, and opens the exhaust valve 18i.

At this time, the air inside the hollow part 18e instantly flows through the exhaust hole 181.
The main piston 18f is released from the isolation spring 1.
The movable electrode 10a is quickly moved downward using 8 g to separate the movable electrode 10a from the fixed electrode 9a.

This is the cut-off state. As described above, according to the present invention, the air operating section is provided on the support insulator pipe that functions as an air tank,
The main piston of the air operating section directly operates the movable reed of the shutoff section, and the upper end of the insulating rod allows air to be introduced into or exhausted from the air operating section or the hollow part of the cylinder in which the main piston is housed. Unlike the indirect operation method using an insulating rod, the insulating rod can be made thinner and lighter, making it cheaper in terms of cost. It requires less force, and the series of operating mechanisms can be made smaller.

In particular, the fact that the external operation stroke requires only the opening and closing of a valve has various excellent effects, such as making it easier to downsize the device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example, and FIGS. 2 and 3 are a sectional view and a main part sectional view showing an embodiment of the present invention, respectively. 6...Blocking part insulator, 8...Blocking part, 9
...Fixed lead, 10...Movable lead, 15...Support insulator, 18...Air operating section, 18a, 18b...Valve , 18d...
...Auxiliary piston, 18f...Main piston, 1
8g...Shutoff spring, 181...Exhaust valve, 19...Bearing frame, 20...Insulation rod, 21...Rod, 22・・・・・・Link mechanism.

Claims (1)

[Scope of utility model registration request] An air operating section is disposed above the support insulator tube that is hermetically filled with compressed air, a blocking section and the blocking section insulator tube are disposed on the air operating section, and a blocking spring is installed in the hollow section provided in the air operating section. The movable reed of the blocking section is connected to the main piston loaded through the support tube, and the movable lead of the blocking section is connected to the main piston loaded through the support tube, and the movable lead of the blocking section is connected to the main piston loaded through the support tube, and the movable lead of the blocking section is connected to the main piston loaded through the support tube. A vacuum circuit breaker characterized in that the vacuum circuit breaker is operated by opening and closing a valve provided at the upper end of an insulating rod operated by the device.