JPH09275609A - Pressure release duct of gas charge container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge pressure release gas outside smoothly, by forming a pressure release duct, putting the horizontal length and the vertical height of an incline and the bore in vertical direction in specified relation. SOLUTION: In a passage made inside a pressure release duct 4, the outer wall face in the middle bent at a right angle is made at an incline 4a which crosses, at a right angle, a vertical passing a ductcore, and besides has a specified angle to the horizontal. Then, the horizontal length L and the vertical height H of the incline 4a have dimensions four-tenths as large as the vertical inside diameter D of the straight part on the side of a gas charge container 1 of a pressure release duct 4. That is, it is made in the relation of L, H>=0.4D. In the pressure release duct 4 in such form, a pressure release gas flow, which flows reversely, being reflected on the inwall of the pressure release duct 4, does not exist, and the pressure release gas flow becomes smooth. Therefore, the cost rise can be suppressed without raising the strength of the gas charge container 1 more than necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure discharge duct of a gas filling container of a gas insulation switchgear for accommodating an electric device such as a circuit breaker and filling an insulating gas therein, and more particularly to a pressure discharge duct due to an internal arc short circuit accident or the like. The present invention relates to a pressure release duct that prevents a container from exploding when it suddenly rises.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a pressure relief device for a gas-filled container of a conventional gas-insulated switchgear shown in, for example, Japanese Utility Model Laid-Open No. 02-88408. FIG. 6 is a perspective view. FIG. 7 is a side view showing another example of the pressure relief device for the gas-filled container of the conventional gas-insulated switchgear shown in Japanese Utility Model Laid-Open No. 2-7817. In FIGS. 5 and 6, 1 is a gas filled container that houses a switch that is an electrical device, 3 is an insulating gas filled in the gas filled container 1 for the purpose of electrically insulating the switch,
Reference numeral 12 is a discharge port for releasing insulating gas, and 5 is a gas sealing container 1.
If the internal pressure of the battery rises abnormally, it bursts and insulating gas 3
A rupture plate for discharging the gas to the outside, 7 a holding plate for fixing the rupture plate 5 to the discharge port 12, 9 an O-ring for maintaining airtightness between the gas sealing container 1 and the rupture plate 5, 18 Is a protection plate provided opposite to the discharge port 12 for guiding the pressure-released gas flow after pressure release in an arbitrary direction, in this case, the upward direction of FIG. The flow of the released pressure-released gas stream, 20 is the flow of the released pressure-released gas stream which is reflected by the protective plate 18 and flows backward, 21 is a spacer for floating the protective plate 18 from the holding plate 7, and 22 is the holding plate 7 and the protection plate. Board 18
It is a bolt for fixing.

When a short circuit accident occurs inside the gas filled container 1, the internal pressure may be rapidly increased by the internal arc, and the gas filled container 1 may eventually explode. In order to prevent this, a rupture plate 5 that is a mechanically weak portion that ruptures when the pressure rises to some extent is provided in advance in a part of the gas sealing container 1. Then, when the internal pressure becomes equal to or higher than a predetermined pressure, the rupturable plate 5 ruptures and the internal insulating gas 3 is ejected from the discharge port 12 as the pressure-released gas flow 19 and the explosion of the gas filled container 1 is prevented. It

In the conventional example shown in FIGS. 5 and 6, the pressure-released gas flow tends to be ejected to the right in the drawings. However, if another device or the like is placed at the ejection destination, the other device receives the pressure-released gas that has been ejected and is damaged, resulting in a secondary disaster. Therefore, in order to prevent the influence on other devices, the protective plate 18 is provided and the pressure-release gas flow 19 is guided in an arbitrary direction.

Further, in the conventional example shown in FIG. 7, the duct 25 is provided so that the discharged pressure-release gas flow does not affect other devices. The duct 25 extending from the side of the gas enclosure 1 is directed upwards in FIG. 7 with no other adjacent equipment. A rupture disc 5 mechanically weaker than the other portions is provided in the upward opening of the duct 25. The rupture plate 5 is held down by the holding plate 7 and stopped by the bolt 22. Then, when the internal pressure exceeds a predetermined pressure, the rupturable plate 5 ruptures, the insulating gas 3 inside is ejected as the pressure-released gas flow 19, and the explosion of the gas filled container 1 is prevented in advance.

[0006]

The conventional pressure relief device for the gas filled container 1 having such a structure has the purpose of preventing the gas filled container 1 from exploding when the internal pressure sharply rises due to an internal arc or the like. A rupture plate 5, which is a mechanically weak part, is provided in a part of the gas sealing container 1, and is protected so that the pressure-release gas flow when the rupture plate 5 ruptures does not affect other devices. Plates 18 or ducts 25 were provided.

However, the released gas has great momentum. Therefore, if there is an obstacle such as the protective plate 18 in the traveling direction, it will be reflected and flow back like the pressure-released gas flow 20 shown by the broken line in FIG. 5, so that the internal pressure rise cannot be suppressed, There was a risk that the gas enclosure 1 would explode.

Further, as shown in FIG. 7, even when the duct 25 is provided, the pressure-release gas flow does not smoothly escape,
There is a pressure-release gas flow 20 shown by a broken line in FIG. 7 which is reflected by the inner wall of the duct 25 and flows backward. Therefore, the internal pressure rise cannot be suppressed and the gas sealing container 1 explodes. The duct 25 was sometimes deformed. Therefore, the strength of the gas filled container 1 is increased and the duct 25
It is necessary to increase the strength of the device, which increases the cost of the device.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to obtain a pressure-relief duct of a gas-filled container in which a pressure-release gas is smoothly discharged to the outside.

[0010]

According to a first aspect of the present invention, there is provided a pressure relief duct for a gas filled container, wherein an outer wall surface of an intermediate portion is orthogonal to a vertical plane passing through a duct axis and is predetermined with respect to a horizontal plane. It is formed on an inclined surface having an angle, and a horizontal length L and a vertical height H of the inclined surface and a vertical inner diameter D on one end side are formed in a relationship of L, H ≧ 0.4D.

In the pressure relief duct of the gas filled container according to the second aspect, the outer wall surface of the intermediate portion is formed into a curved surface, and the radius of curvature r of the curved surface and the inner diameter R on the one end side are r ≧ 0.65R. Is formed in.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a cross-sectional view showing a pressure release duct of a gas filled container according to the present invention. Further, FIG. 2 is a perspective view. In FIG. 1 and FIG. 2, 1 is a gas filled container that accommodates a switch, which is an electric device, 1a is an opening provided in a side portion of the gas filled container 1, and 3 is an opening and closing filled in the gas filled container 1. Insulating gas 4 for the purpose of electrically insulating the container is connected at one end to the opening 1a of the gas sealing container 1, extends outward from the opening 1a, bends at a right angle in the middle portion, and extends vertically upward. The pressure release duct 5 is a rupture plate airtightly attached to the discharge port 2 formed at the other end of the pressure release duct 4, and is broken when the internal pressure of the gas sealing container 1 rises abnormally and the insulating gas 3 Is to be released to the outside. 6 is a pressure-releasing gas flow that is the flow of the insulating gas 3 that has been released, 7 is a holding plate for fixing the rupture plate 5, 8 is a bolt for fixing the holding plate 7, and 9 is the duct 4 and the rupture plate. 5 is an O-ring for maintaining airtightness with 5, 10 is a bolt for fixing the pressure release duct 4 to the gas sealing container 1, 11 is an O for maintaining airtightness between the gas sealing container 1 and the duct 4. It's a ring.

The pressure discharge duct 4 is a pipe having a rectangular cross section, and has a flange 4b provided at one end for connecting to the gas sealing container 1. The pressure release duct 4 is attached to the opening 1a provided in the side portion of the gas sealed container 1 with the flange 4b connected thereto. Pressure relief duct 4
Extends outwardly from the opening 1a, then bends at a right angle in the middle portion and extends vertically upward. A flange 4b is formed at the other end of the pressure release duct 4. Flange 4b
A rupture plate 5 is attached to the.

In the passage formed inside the pressure discharge duct 4, the outer wall surface of the intermediate portion bent at a right angle is orthogonal to the vertical plane passing through the duct axis and has a predetermined angle with the horizontal plane. It is formed on the slope 4a. And
Horizontal length L and vertical height H of slope 4a
Is 0.4 times the inner diameter D of the straight portion of the pressure release duct 4 on the gas sealed container 1 side in the vertical direction. That is, they are formed in a relationship of L, H = 0.4D.

In the pressure-release duct 4 having such a shape, there is no pressure-release gas flow that is reflected by the inner wall of the pressure-release duct 4 and flows backward, and the pressure-release gas flow flows smoothly. Therefore, the strength of the gas filled container 1 does not need to be increased more than necessary, and the cost increase can be suppressed. Also, slope 4
If either the horizontal length L or the vertical height H of a is less than 0.4 times the inner diameter D, the pressure-release gas is not smoothly discharged to the outside. And when both are 0.4 times or more of the inner diameter D, the pressure-released gas flow was smoothly discharged.

Incidentally, the pressure release duct 4 in the present embodiment.
Is removed as shown in FIG. 3 when there is no other adjacent device. The rupturable plate 5 is the opening 1a of the gas enclosure 1.
Directly attached to As described above, by removing the pressure release duct 4, there are advantages that the cost of the device is reduced and the outer dimension is reduced. Further, although the present invention is directed to the gas filled container of the gas insulated switchgear, it may be another device, and the gas filled container is filled with an insulating gas. However, the same effect is obtained.

Embodiment 2 FIG. FIG. 4 is a cross-sectional view showing another example of the pressure relief duct of the gas filled container of the present invention. The pressure release duct 24 of the present embodiment has a circular cross section. And
It is bent in an arc at the middle part. Pressure release duct 24
Is a pipe having a circular cross section, and has a flange 24b formed at one end for connecting to the gas sealing container 1. The pressure release duct 24 is attached to the opening 1a provided at the side portion of the gas sealed container 1 with the flange 24b connected thereto. The pressure relief duct 24 extends outward from the opening 1a, then bends in an arc at the middle portion and extends vertically upward. A flange 24b is formed at the other end of the pressure release duct 24. The rupture plate 5 is attached to the flange 24b. Other configurations are the same as those of the first embodiment.

In the passage formed inside the pressure release duct 24, the outer wall surface of the middle portion bent in an arc shape is formed into a curved surface 24a, and the radius of curvature r of the curved surface 24a and the side connected to the gas sealing container 1. The inner diameter R of the straight part of is r = 0.6
It is formed in a relationship of 5R.

The pressure relief duct 2 having the shape according to the present embodiment
4, in the same manner as in the first embodiment, the pressure release duct 24
There is no pressure-release gas flow that is reflected back to the inner wall of the, and the pressure-release gas flow flows smoothly. Therefore, the gas enclosure 1
There is no need to increase the strength of the product more than necessary, and the cost increase can be suppressed. Also, the radius r is 0.65 of the inner diameter R.
If it is less than double, the pressure-released gas is not smoothly discharged to the outside. Further, when it was 0.65 times or more, it was discharged smoothly.

[0020]

In the pressure-release duct for a gas filled container according to the first aspect of the present invention, the outer wall surface of the intermediate portion is an inclined surface that is orthogonal to the vertical plane passing through the duct axis and has a predetermined angle with the horizontal plane. The length L of the slope in the horizontal direction and the height H in the vertical direction and the inner diameter D in the vertical direction on one end side are L and H.
Since the relationship of ≧ 0.4D is formed, there is no pressure-release gas flow that is reflected by the inner wall of the pressure-release duct and flows backward, and the pressure-release gas is smoothly discharged to the outside, which improves the strength of the gas-filled container. There is no need to raise it more than necessary, and it is possible to suppress cost increases.

In the pressure relief duct of the gas filled container according to the second aspect, the outer wall surface of the intermediate portion is formed into a curved surface, and the radius of curvature r of the curved surface and the inner diameter R on the one end side are r ≧ 0.65R. Since there is no pressure-releasing gas flow that reflects back to the inner wall of the pressure-releasing duct and flows backward, the pressure-releasing gas is smoothly discharged to the outside, and it is necessary to raise the strength of the gas sealing container more than necessary. It is possible to suppress the cost increase.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a pressure release duct of a gas filled container according to the present invention.

FIG. 2 is a perspective view showing a pressure release duct of the gas sealed container of the present invention.

FIG. 3 is a view in which the pressure release duct is removed and the rupture plate is attached to the opening of the gas sealing container.

FIG. 4 is a cross-sectional view showing another example of the pressure relief duct of the gas sealed container of the present invention.

FIG. 5 is a sectional view of a pressure relief device for a gas filled container of a conventional gas insulated switchgear.

FIG. 6 is a perspective view of a pressure relief device for a gas filled container of a conventional gas insulated switchgear.

FIG. 7 is a side view showing another example of a pressure relief device for a gas filled container of a conventional gas insulated switchgear.

[Explanation of symbols]

1 gas sealing container, 1a opening, 4,24 pressure release duct, 4a slope 5 bursting plate, 24a curved surface, L slope horizontal length, H slope vertical height, D inside diameter, r curvature curvature Radius, R Inner diameter.

Claims (2)

[Claims] 1. An end is connected to an opening provided at a side portion of a gas-filled container in which an electric device is housed and which is filled with an insulating gas, extends outward from the opening, and is bent at a right angle in an intermediate portion. , Vertically extending upward, the other end of the rupture plate consisting of a thin plate to form a rectangular cross section airtightly attached, when the pressure inside the gas sealing container reaches a predetermined pressure and the rupture plate ruptures, A pressure discharge duct of a gas sealing container that changes the flow of the insulating gas that has entered from one end upward at the intermediate portion and discharges it from the other end to the outside, wherein the outer wall surface of the intermediate portion passes through the duct axis. It is formed on a slope that is orthogonal to the vertical plane and has a predetermined angle with respect to the horizontal plane. The slope has a horizontal length L and a vertical height H, and a vertical inner diameter D on one end side. , L, H ≧
A pressure-release duct for a gas-filled container, which is formed to have a relationship of 0.4D. 2. One end is connected to an opening provided at a side portion of a gas-filled container in which an electric device is housed and in which an insulating gas is filled, the one end is extended outward from the opening, and an arc shape is formed at an intermediate portion. Bending, vertically extending upward, a rupture plate made of a thin plate material is airtightly attached to the other end to form a circular cross section, and when the pressure inside the gas sealing container reaches a predetermined pressure and the rupture plate ruptures. A pressure discharge duct of a gas sealing container that changes the flow of the insulating gas that has entered from one end to the upper part at the intermediate part and discharges it from the other end to the outside, wherein the outer wall surface of the intermediate part is formed into a curved surface. The pressure release duct for a gas filled container, wherein the radius of curvature r of the curved surface and the inner diameter R on one end side are formed in a relationship of r ≧ 0.65R.