JPS5960931A - Switch - 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 switch that opens, and more particularly to a switch that extinguishes an arc by using fluid expanded by an arc rL when the arc is cut off.

[Technical backbone of the invention and its problems]

In general, if a switch is used to extinguish an arc using sulfur hexafluoride (SFe) gas, a valve is installed from the royal side to the low-pressure chamber side (by blowing the resulting gas flow) against the arc generated when the arc is cut off. A two-pressure method that extinguishes the arc by blowing pressurized gas through the action of the cylinder and piston that reaches the ringing contact when the arc is cut off.
(The pressure method, so-called buffer method, etc., are known.

However, since the former requires a compression device and a valve part, it is complicated, large-sized, and uneconomical, and the latter pressurizes the waste using a piston and cylinder.
There was a drawback that a large operating machine was required to drive the movable contactor connected thereto.

Therefore, for the switch of the above-mentioned type, there is a method of installing a compression device or driving the cylinder and piston to compress the gas.A method of extinguishing the arc by using the fluid expanded by the heating of the arc at the time of shutoff without stealing or using it. A switch was devised.

However, when this type of switch is used, the arc energy is small when a small current is interrupted, so a pressure increase in the external pressure chamber that stores the expanded gas due to the arc cannot be expected, resulting in a decrease in arc extinguishing ability. Was.

[Purpose of the Invention] The present invention was made with a focus on the above-mentioned problems, and its purpose is to provide a switch that requires less operating force and that can generate a small current. be.

[Summary of the invention]

A hollow fixed contact in a container containing arc-extinguishing gas,
This is equipped with an aJ-shaped contact that can be freely connected and separated, and the arc generated when the front contact opens and releases increases the pressure of the arc-extinguishing gas, and applies it to the arc to extinguish the arc. , one side of a partition wall that has an opening that communicates with the hollow part of the fixed contact and partitions the inside of the container, and one side of the gauze nozzle that surrounds the side of the front moving contact JiU. An external pressure chamber is formed by rqi1, and an exhaust chamber is formed on the other side of the nozzle. An arc contact is movably inserted therein, and a piston is provided in the MM portion of the arc contact on the exhaust chamber side.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3. In the figure, 1 is a container made of an insulator, and inside this container 1 is sulfur hexanitide (as an arc-extinguishing gas).
8 is filled with 'e) dregs, and further fixed and 5J
Each of the movable contacts 13°10 to 12'J is housed in a closed compartment. Further, a support plate 2 is provided in each of the above-mentioned vessels as a partition wall for partitioning the inside thereof, and the fixed contact 13 is held on this support plate 2.The fixed contact 13 is formed in a hollow shape. The hollow portion 13a is communicated with an opening 2a closed in the support plate 2.

Further, the movable contact 10 is surrounded by a circumferential side portion &1 insulating nozzle 9, and this insulating nozzle 9 is opposed to the front 1-post plate 2 at a distance. An external pressure chamber A (4'14) is formed between one side of the supports 'a, 2 and one side of the insulating nozzle 9 opposing thereto. A first exhaust chamber 2I is formed on the other side of the support plate 2σ, and a second exhaust chamber 11 is formed on the other side of the front arm nozzle 9.゛Also, =il The OJ moving contact 10 is the holding member 2
It is movably held by 0.

Further, the peripheral side portion of the fixed contact 13 is surrounded by an insulating cover 12, and the insulating cover 12 covers the pressurizing chamber A.
is divided into Mll and a second pressurization chamber 4.5.

The volume of the pressurizing chamber 4 described in item 6 is smaller than the volume of the second pressurizing chamber 5. Further, a hollow arc contact 8 is movably inserted into the inner part 13a of the fixed contact 13 and the opening 2a of the support plate 2, and one end thereof is inserted into the first exhaust chamber 2. is prominent. A piston 3 is attached to one end of the arc contact 8, and a spring 6 as a relaxation member is interposed between the piston 3 and the inner wall surface of the anterior cannula 1. In addition, the insulating guide 9 includes a protrusion 24 and a retaining plate 2 that protrude from the medium heating section of the inner wall of the container 1 in order to widen the entire second pressurizing chamber 5.
Shield 19 coated with insulator attached to
It is supported and fixed by.

Therefore, in the above-described configuration, when a cutoff operation is performed with the fixed and movable contacts 13.10 being closed, the movable contacts 10 are driven rightward in the drawing by an operating mechanism (not shown), and the movable contacts 13. As shown in FIG. 2, an arc is first generated between the fixed contact I3 and the movable contact 10. Then, the arc contact 8 that is linked to the piston 3 pushed by the spring 6 starts to move, and the tip of the arc contact 8 moves from the tip of the fixed contact 13 toward the movable contact 10, and the fixed contact 13 also moves towards the arc contact 8. Ark moves to! LLII. Moreover, the fluid of the first pressure increase plan 4 is compressed by the movement of the piston 3,
After passing through the circulation hole 17, the passage I5 inside the insulating cover 12
The fluid is guided to the tip side of the fixed contact 13 through the fluid, and at the same time mixes with the fluid expanded by the arc.

On the other hand, the fluid in the second pressurizing chamber 5 also expands due to the arc, and its pressure increases. As a result, the first and second pressurizing chambers 4, 6
At EJ:, Tsumugi and the expanded fluid are blown by the arc and cut off.

By the way, the interruption with a short arc time, that is, the interruption until the movable contact IQ leaves the insulated guide 9, occurs when the fluid compressed and expanded in the first and second pressurizing chambers 4 and 5 passes through the hollow part 22 of the arc contact 8. The arc is blown into the exhaust chamber 2I and cut off. The fluid compressed and expanded in step 5 not only flows through the hollow part 22 to the exhaust chamber 2, but also flows into the movable exhaust chamber 11 through the through opening fft (s23) of the insulating guide 9, causing the arc to flow. The shutoff is completed by the blowing. This shutoff state is shown in Fig. 3.

In addition, when the current is small, the arc energy is small, so a pressure increase in the first and second pressurizing chambers 4 and 5, which store the expanding fluid due to the arc, cannot be expected to increase; The compressed fluid is compressed by the piston 3 and blows strongly against the arc by cutting through the passage #515 made up of the insulating cover 12, so that the arc can be extinguished.

In the above embodiment, the insulating kite 9 was supported by the protrusion 24 of the container 1 and the shield 19, but as shown in FIG. It's okay.

In addition, as shown in FIG. 5, a cylindrical body 27 made of gold and kHz is fitted inside the exhaust chamber 2) in contact with the inner wall surface thereof, and the inner wall surface of the exhaust chamber 2I facing the piston 3 has an arc-resistant structure. An insulating plate 28 having a high temperature may be provided. According to this embodiment, the cylindrical body 27 reduces frictional resistance generated between the piston 3 and the piston 3, allowing the piston to operate smoothly.
The heat resistance strength of the inner surface of 1 is strengthened, and its deterioration can be reduced.

In addition, in the one shown in FIG. 5, the insulation guide 9 is fitted into the protrusion 24 protruding from the center of the inner wall of the container 1 and into the exhaust chamber II so as to be in contact with the inner wall surface of the exhaust chamber II. It is held under pressure by the cylinder 25. Thereby, the heat resistance strength of the exhaust chamber 11 side can also be strengthened, and its deterioration can be reduced.

In addition, as shown in FIG. 6, the pressurization chamber 5 and the exhaust chamber I
arc-resistant Ie in contact with its inner wall surface.
The insulating nozzle 9 may be held under pressure by the end surfaces of the insulating cylinders 25, 26 by fitting the edge cylinders 25, 26 inside. According to this, the heat resistance of the pressurizing chamber 5 can be strengthened and the deterioration of η1 can be reduced.

Also, k! As shown in FIG. 7, a pressure regulator 27 may be provided at one end of the arc contact 8 that projects toward the exhaust chamber 2I. This 8-point pressure regulator 27 closes the hollow portion 22 until the pressure inside the inner chamber 522 of the arc contact 8 reaches a predetermined value.
It is designed to open the air chamber 2 when shut off.
After the pressure inside I is lowered to -F to correct the pressure characteristics between the exhaust chamber 21 and the pressurizing chamber 4, the flow cup is rapidly flowed from the pressurizing chamber 4 into the exhaust chamber 21. With this, the fluid can be strongly blown into the arc and the arc can be cut off reliably even in low-energy interruptions such as small-torque interruptions.

In addition, the pressure regulator is attached to the inner wall surface of the container I facing the hollow part 22 of the arc contact 8 at the end 91 at the bottom 5 in FIG.
A protrusion 28 with a conical shape M and a slightly smaller outer diameter than the hollow part 22 of the arc contact 8 is provided protrudingly, and the protrusion 28 is configured to be inserted into and removed from the 9th hole (ilI 22) of the arc contact 8. Even if it is made to do so, the same effect as shown in FIG. 7 can be obtained.

〔Effect of the invention〕

The present invention is as follows. As shown in Figure 6, a hollow nitrogen-shaped fixed contact is placed in a container containing an arc-extinguishing gas, and a movable contact that approaches and separates from the contact is placed in a container containing an arc-extinguishing gas. The arc-extinguishing gas is pressurized by the generated arc and directed toward the arc to extinguish the arc, wherein an opening communicating with the hollow part of the identification contact and a front 8L arc-extinguishing gas circulation hole are provided. 9111, a partition wall that partitions the inside of the container;
A pressurizing chamber is formed by the surface and one side of the insulating nozzle surrounding the circumferential side of the movable contact, an air chamber is formed on the other side of the partition wall and the insulating nozzle, and the opening of the partition wall and A hollow arc contact is movably inserted into the hollow part of the front hC fixed contact, and a piston is provided at one end of the arc contact that protrudes toward the exhaust chamber. Instead of using the expansion action of the arc-extinguishing fluid, it is possible to use the arc-extinguishing fluid compressed by the piston pushed by the spring force, so it is possible to change from large current to small electric current t1 series with a small operating force. It has the effect of being able to cut off a wide range of

[Brief explanation of the drawing]

Figures 1 to 3 show the breaking section of a switch which is an embodiment of the present invention, and Figure 1 shows the side @ showing the closed state.
The top view, Figure 2 is a side sectional view showing the shutoff operation, and Figure 3 is
The reason for this is a side sectional view showing when the shutoff is completed, FIG. 4 is a side sectional view showing the first other embodiment of the present invention, and FIG. 5 is a side sectional view showing the second other embodiment of the present invention. The cross-sectional view, FIG. 6 does not show the third other embodiment of the present invention, and the side cross-sectional view, and FIG. 7 shows the fourth embodiment of the present invention.
FIG. 8 is a side θcrm view showing a fifth other embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Container, 13... Fixed contact, 10... Movable contact, 22... Hollow part, 17 River flow hole, '2...
Partition wall (support plate), A... Pressurization chamber, 9... Insulating nozzle, 8... Arc contact, 22... Middle wall part, 3...
...Piston.

Claims (1)

[Scope of Claims] (1) A hollow fixed contact is provided in a container containing an arc-extinguishing gas, and a movable contact that freely approaches and separates from the hollow contact is provided, and when the inner contact is opened and closed, The arc-extinguishing gas is pressurized by an arc and is blown onto the arc to extinguish the arc. One side of the partition wall that partitions each vessel and I! and one side of the insulating nozzle surrounding the group 11111 of the TI recording contact to form a boosting chamber,
An exhaust chamber is provided on the other side of the partition wall and the insulating nozzle. The front 6 is connected to the inner part of the partition wall, and the hollow arc contact is moved to the middle part of the fixed contact.
1+Ki U [Ki M O! ll Vt - A switch characterized by having a piston installed at one end to be extracted. The switch according to claim 1, characterized in that a cover is provided. (3) A buffer is provided between the piston and the inner wall surface of the container facing the piston. The stretcher and shut-off device according to claim 1. (4) A special claim characterized in that a metal cylinder is fitted into the exhaust chamber in which the piston moves, in contact with the inner wall surface of the exhaust chamber. A switch according to item 1. (5) A special feature characterized in that a pressure regulator for adjusting the internal pressure of the arc contact is provided on the exhaust chamber side.
Claim 1 Item 1 V) Switch. (6) The switch according to claim 5, characterized in that the pressure regulator is provided at one end of the arc contact that is extracted to the exhaust chamber side. (7) The pressure regulator is opposite to the arc contact. 6. The switch according to claim 5, characterized in that the switch is constituted by a protrusion that protrudes from the inner wall surface of the exhaust chamber and is inserted into and removed from the hollow part of the arc contact.