JPH01226583A - Explosion releasing structure for tank - Google Patents

Abstract

PURPOSE:To improve safety efficiency of a tank by always releasing and emitting the pressure from the upper part of the tank when the internal pressure of the tank rises, by forming a fragile part which fractures with a high pressure that is higher than the prescribed pressure in the tank, at the roof part which is close to the bonded part to the tank main body. CONSTITUTION:By an ascending force 13 due to the rising of the tank internal pressure, to around a bonded part 9 between a tank main body 3 and a roof 5, a compressive stress 29 is added in the peripheral direction. When the tank internal pressure has risen higher than the prescribed pressure, i.e., when a compressive stress which is higher than the prescribed value is added to the bonded part 9, it is constituted that the roof 5 gives a buckling fracture at notches 20, 24. Therefore, when the tank internal pressure has risen higher than the prescribed pressure, an upper opening 4 of a cylindrical tank 6 is widely released, and the tank internal pressure can be released from the upper part of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] □The present invention relates to the construction of a tank for detonation, and particularly to a tank detonation structure that can release the internal pressure of the tank from the upper part of the tank.

[Prior Art] Conventionally, releasing the internal pressure of a tank that seals and stores liquid fuel has relied on a safety valve.

For example, as shown in FIG. 4, there is a bottomed cylindrical tank body 3 consisting of a bottom plate 1, a cylindrical side plate 2 that is erected and joined to the top surface of the bottom plate 1, and an upper opening of the tank body 3. 4
In the cylindrical tank 6, which consists of a gate-shaped roof part 5 that covers the tank body 3 and is joined to the tank body 3, there is a Conventionally, a safety valve 8 has been attached to the roof portion 5.

[Problems to be Solved by the Invention] However, if the tank internal pressure rises rapidly and the pressure release by the safety valve 8 does not reduce the tank internal pressure sufficiently,
A structurally weak part of the cylindrical tank 6, i.e. the joint 9 between the roof 5 and the side plate 2 or the joint 10 between the bottom plate 1 and the side plate 2
will be destroyed first, and the pressure will be released from there.

If the latter joint lO is destroyed, the liquid material 7 will flow outward from the bottom of the cylindrical tank 6 in the circumferential direction, which may destroy peripheral pipelines (not shown) and cause a major accident.

The present invention has been made in consideration of the above circumstances, and is capable of releasing and discharging the pressure from the upper part of the tank whenever the internal pressure of the tank increases, thereby improving the safety of the tank. The purpose is to provide a structure.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a bottomed cylindrical tank body that accommodates liquid fuel inside, and a tank body that covers the upper opening of the tank body. In a tank consisting of a joined roof, a fragile part is formed in the roof part near the joint with the tank body, which can be destroyed by rising pressure above a predetermined pressure inside the tank.

[Operation] Liquid fuel is stored in the bottomed cylindrical tank body, and a roof covering the opening of the tank body is joined to the upper part of the tank body. When the internal pressure of the tank increases due to evaporation of the stored fuel, for example, in the case of a cylindrical tank, an upward force 13 as shown in FIG. 4 acts. If we look at the influence of this upward force 13 on the cylindrical tank 6 from the point of view of the joint 9 between the roof 5 and the tank body 3, the joint 9 will be as shown by the broken line 14 as shown in FIG. As a result, a compressive force acts on the joint portion 9 in the circumferential direction of the cylindrical tank 6 .

In the fuel tank of the present invention, when the internal pressure of the tank rises to a predetermined pressure or higher, the weakened portion formed in the roof near the joint with the tank body is destroyed, and the upper opening of the tank is opened.

[Example 1] An example of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a cylindrical side plate 2 that stands up from the top surface of the thin bottom plate 1 is joined to the bottom plate 1. As shown in FIG. The side plates 2 and the bottom plate 1 form a tank body 3 in the shape of a cylinder with a bottom.

One side 16 is joined along the edge of the upper opening 4 of the tank body 3, that is, the uppermost inner circumferential wall of the side plate 2 and extends upward from the side plate 2, and the other side 17 is connected to the above-mentioned -side 16.
An L-shaped top angle 18 is provided which is bent and extends inward in the radial direction of the tank body 3 from the extending end of the tank body 3 .

As shown in FIG. 2, on the other side 17 of the top angle 18, a plurality of notches 20 are formed in the shape of a thousand discs, spaced apart by a predetermined distance along the circumferential direction.

The notch 20 is formed by cutting the other side 17 of the dog angle 18 from its extended end radially outward of the tank body 3 by a predetermined length m.

Further, on the other side 17 of the top angle 18, an umbrella-shaped roof plate 21M that covers the upper opening 4 of the tank body 3 is arranged and joined at a position radially outward of the tank body 3 from the notch 20. ing. The roof plate 21 and the top angle 18 form a roof portion 5, and the tank body 3 and the roof portion 5 form a cylindrical tank 6.

As shown in FIG. 1, the roof plate 21 has an inner surface 22.
That is, on the surface facing the inside of the cylindrical tank 6, the roof plate 2
A plurality of notches 24 are provided extending in the radial direction.

As shown in FIG. 3, these notches 24 are formed in the shape of a triangular prism, and are radially formed at predetermined intervals in the circumferential direction of the roof board 21. As shown in FIG.
They are formed in the same number as , and are provided so that they each have a common center line 25 . These two types of notches 20.24
A weak portion 27 of the roof portion 5 is constituted by this.

Further, the roof portion 5 is configured to buckle and break at the weakened portion 27 when the tank internal pressure rises to a predetermined pressure or higher. Specifically, due to the upward force 13 caused by the increase in tank internal pressure, a second
As shown in the figure, a compressive stress 29 in the circumferential direction is applied, but when the tank internal pressure rises to a predetermined pressure or higher, that is,
The roof portion 5 is configured to buckle and break at the notch 20.24 when a compressive stress of a predetermined value or more is applied to the joint portion 9.

Therefore, when the tank internal pressure is less than a predetermined pressure, the cylindrical tank 6 seals and accommodates the liquid source f47 inside, but when the tank pressure rises above the predetermined pressure, the increased pressure causes the vicinity of the joint 9 to The roof part 5 of is the weak part 27, i.e.
It is broken at notch 20.24.

Therefore, when the tank internal pressure is increased to a predetermined pressure or higher, the upper opening 4 of the cylindrical tank 6 is largely opened, and the tank internal pressure can be released from the upper part of the tank. Thereby, the safety of the cylindrical tank 6 is improved compared to the case where the tank internal pressure and the liquid fuel 7 are released and flowed out from the tank bottom.

In the above embodiment, the notch 20 of the top angle 18 was formed in the shape of a semicircular plate, and the notch 24 of the roof board 21 was formed in the shape of a triangular prism, but the shapes are not limited to these.

Moreover, the notch 24 of the roof sheet 21 is formed on the inner surface 22 of the roof sheet 21.
That is, although it is formed on the surface facing the inside of the cylindrical tank 6, it may be formed on the upper surface 30 of the roof plate 21. Furthermore, although two types of notches 20 and 24 are provided in the roof part 5, when the tank internal pressure rises to a predetermined pressure or higher, the roof part 5 near the joint 9 between the roof part 5 and the tank body 3 For example, the fragile portion 27, i.e., the notch 20, may be formed only in the top angle 18. In addition, the fragile portion 27 is not limited to the notch, for example, in the roof plate 21. A part of it may be made of a material 11 that is weak against compressive stress.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are achieved.

In a tank consisting of a bottomed RFU-shaped tank body that accommodates liquid fuel inside, and a roof that covers the upper opening of the tank body and is joined to the tank body, the roof near the joint with the tank body Since a fragile portion is formed that is destroyed by rising pressure above a predetermined pressure within the tank, the weakened portion of the roof portion is destroyed when the tank internal pressure is increased beyond the predetermined pressure. This opens the upper opening of the tank body, through which the tank internal pressure can be released. Therefore, the safety of the tank can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the tank explosion structure of the present invention, FIGS. 2 and 3 are a perspective view and a cross-sectional view of the main part of FIG. 1, respectively, and FIG. 4 is a conventional FIG. 5 is a schematic longitudinal cross-sectional view showing the detonation structure of the cylindrical tank, and FIG. In the figure, 3 is the tank body, 4 is the upper opening, 5 is the roof,
6 is a cylindrical tank that is a liquid fuel tank, 7 is a liquid fuel,
9 is a joint, and 27 is a weak portion. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinuya Figure 2

Claims (1)

[Claims] 1. In a tank consisting of a bottomed cylindrical tank body that accommodates liquid fuel inside, and a roof that covers the upper opening of the tank body and is joined to the tank body, near the joint with the tank body. An explosion structure for a tank, characterized in that a fragile part is formed on the roof of the tank, which is destroyed by rising pressure above a predetermined pressure inside the tank.