JPH056260U - Pressure relief device - Google Patents

Abstract

(57) [Summary] [Purpose] To release pressure by opening the pressure relief port formed in the pressure vessel without shearing the pressure relief plate. [Structure] An annular packing groove 16 is formed on the outside of a circular pressure release port 15 formed in a pressure container 13, and a packing 17 is attached to this, and a pressure release plate 18 in which the pressure release port 15 is closed from the outside of the container 13 is provided. a flange portion 18b, as well as to be smaller than the diameter d ₃ the inner peripheral side of the large packing groove 16 than the diameter d ₁ of the inner diameter d ₂ is release pressure port 15, the outer diameter d ₅ of the packing groove 16 that The inner diameter d ₄ of the annular holding plate 19 that is formed so as to be between the inner and outer diameters d _{3 and} d ₆ and presses the collar portion 18 b against the container 13 via the packing 17 is set to the inside of the packing groove 16. It is formed to be slightly larger than the diameter d ₃ on the circumferential side and smaller than the outer diameter d ₅ of the collar portion 18b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention, in a pressure vessel used for a gas insulated switchgear (hereinafter referred to as GIS), releases the pressure by opening the pressure relief port against pressure rise at the time of an internal accident such as a short circuit to prevent destruction of the vessel. The pressure relief device.

[0002]

[Prior Art]

 This type of conventional pressure release device has a structure that releases pressure by shearing a pressure release plate provided at a pressure release port of a container when the internal pressure rises. For example, as shown in FIG. 5, a pressure relief plate 3 made of a carbon molded product is fitted into a circular pressure relief port 2 formed in a pressure vessel 1, and the pressure relief plate 3 is fixed by a retainer plate 4 together. A protective plate 6 is attached via an attachment stud 5 to a position facing the pressure relief plate 3 on the outside of the container 1.

The pressure release plate 3 is composed of an annular portion 3a and a thin portion 3b that closes the inside of the annular portion 3a. When the internal pressure of the container 1 rises, the thin portion 3b is broken to release pressure. The protective plate 6 prevents the fragments of the pressure release plate 3 from scattering.

FIG. 6 shows another shear-type pressure release device, which is formed by press-forming a metal plate of aluminum, stainless steel, copper, nickel or the like on the circular pressure release port 8 of the pressure vessel 7. The pressure plate 9 is attached from the outside of the container 7, and the pressure plate 9 is fixed by the pressing plate 10, and the protective plate 12 is attached to the outside of the container 1 via the attachment stud 11.

As shown in (B) of the same figure, a cross-shaped groove 9a is engraved on the pressure-release plate 9. When the internal pressure rises, the groove 9a is broken at a thin portion of the groove 9a, and (A) of the same figure. As shown by the chain double-dashed line, the pressure relief plate 9 breaks into four pieces and releases pressure.

Here, in the GIS pressure vessel, since the insulating gas such as SF ₆ gas is sealed at a pressure higher than the atmospheric pressure after evacuation, the pressure relief plates 3 and 9 are evacuated. It is required to withstand the external pressure (atmospheric pressure) of 1 kgf / cm ² at the time of opening, the internal pressure when gas is filled (the maximum operating pressure of GIS), and to break at a pressure below the breaking pressure of the container.

[0007]

[Problems to be solved by the device]

 In the above-mentioned conventional pressure relief device, since the pressure relief plates 3 and 9 are sheared to release pressure when the internal pressure rises, it is necessary to carefully select the materials of the pressure relief plates 3 and 9 with little variation in strength. In addition, it is also necessary to consider the strength (pressure resistance) of the pressure relief plates 3, 9 themselves, quality control of the material is not easy, and it becomes very difficult to obtain the desired material. Is difficult and expensive to produce.

In particular, in the case of the pressure-release plate 3 of the carbon molded product shown in FIG. 5, since fragments of the pressure-release plate 3 scatter at the time of pressure release, there is a drawback that the post-treatment becomes a difficult work. In the case of the pressure release plate 9 shown in FIG. 6, there is a drawback that it is very difficult to control the depth of the groove 9a.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to release pressure when the internal pressure of the pressure vessel rises without shearing the pressure release plate. It is to provide a pressure release device that can perform.

[0010]

[Means for Solving the Problems]

 To achieve the above object, in a pressure relief device of the present invention, a circular pressure relief port formed in a pressure vessel and an annular packing recessed on the outer surface of the vessel outside the pressure relief port. The groove, the packing attached to the packing groove, and the cap-like shape are formed. When the inner diameter of the flange portion is larger than the diameter of the pressure release port and smaller than the inner diameter side of the packing groove, the collar portion is also formed. Has a larger outer diameter than the inner diameter of the packing groove and a smaller outer diameter than the outer diameter, and has a pressure relief plate with the pressure relief port closed from the outside of the container and an inner diameter slightly larger than the inner diameter of the packing groove. The pressure relief plate is formed to have a diameter smaller than the outer diameter of the flange portion, and the annular pressure plate presses the flange portion against the outer surface of the container through the packing.

[0011]

[Action]

 In the pressure relief device configured as described above, when the internal pressure of the pressure vessel rises, an outward force acts on the cap portion of the flange-shaped pressure relief plate with the pressure relief port closed, so that the pressure relief plate is It deforms outward, and with this, the gap between the inner diameter of the holding plate and the inner diameter of the packing groove, that is, the clearance, is used to hold it between the holding plate and the container with packing. The flange part of the pressure relief plate that had been deformed deformed so that the outer peripheral edge of the pressure relief plate could be inserted into the packing groove by the elasticity of the packing, and the flange part was pulled out while sliding on the inside of the holding plate, and the entire pressure relief plate fell out. , Released.

[0012]

【Example】

Examples will be described with reference to FIGS. 1 to 4. In these drawings, 13 is a pressure vessel used for GIS and the like, and a circular pressure release device pedestal 14 is integrally bulged on the upper wall of the container 13, and an inner diameter d is formed at the center of the pedestal 14. ₁ together with a circular discharge pressure port 15 is formed, packing groove 16 concentric annular outside your Keru release pressure port 15 on the upper surface of the base 14 is recessed, uniformly throughout the packing groove 16 packing 17 Is installed.

The upper surface of the pedestal 14 has different heights on the outside and inside of the packing groove 16, and as shown in FIG. 3, the height h on the outer peripheral side of the packing groove 16 is the plate thickness t of the pressure-release plate described later. Is set to the sum of the compressed thickness of the packing 17, and the upper surface on the inner peripheral side of the packing groove 16 is formed lower than the upper surface on the outer peripheral side by the plate thickness t of the pressure relief plate.

Reference numeral 18 denotes a pressure release plate formed by press-molding aluminum, resin or the like having a small elastic coefficient to form a flanged cap shape and closing the pressure release port 15 from the outside of the container 13. The portion 18a is attached to the outside of the container 13, and the inner diameter of the collar portion 18b, that is, the inner diameter d ₂ of the cap portion 18a is the inner diameter d _{1 of the} pressure release port 15 and the inner diameter d of the packing groove 16. ₃ is set so that d ₁ <d ₂ <d _3, and the outer diameter d ₅ of the collar portion 18 b is d ₃ and d ₆ on the inner and outer peripheral sides of the packing groove 16, and d It is set so that ₃ <d ₅ <d _6, and the outer peripheral edge of the collar portion 18 b is located on the packing 17 of the packing groove 16.

Reference numeral 19 denotes a holding plate which is mounted on the pedestal 14 by a plurality of mounting studs 20 and which presses the outer peripheral portion of the collar portion 18 b of the pressure release plate 18 onto the pedestal 14 via the packing 17, and thereby the pressure release plate. 18 is attached with the pressure release port 15 closed. The inner diameter d ₄ of the holding plate 19 is set so that d ₃ <d ₄ <d ₅ , and in particular, a gap having the plate thickness t of the pressure release plate 18 is provided between the holding plate 19 and the inner peripheral surface of the packing groove 16. And there is a relationship of d ₃ = d ₄ -2t.

Reference numeral 21 is an annular Teflon sheet interposed between the holding plate 19 and the collar portion 18b, which is provided to reduce the frictional resistance when the pressure relief plate 18 is pulled out. It may be replaced with grease. 22 is a waterproof sealant filled in the joint between the inner peripheral surface of the presser plate 19 and the upper surface of the collar 18b, and 23 is installed between the upper ends of the mounting studs 20 so that the pressure relief plate 18 does not pop out. It is a protective plate that receives it.

Next, the operation will be described. When the inside of the pressure vessel 13 is evacuated, a pressure of 1 kgf / cm ² is applied to the pressure relief plate 18 from the outside in the state shown in FIG. 3, but the inner diameter d ₂ of the cap portion 18a of the pressure relief plate 18 is the pressure relief port 15 Since it is formed larger than the inner diameter d _1, the bent portion between the cap portion 18a and the collar portion 18b is received by the pedestal 14, and the strength of the pressure relief plate 18 is maintained.

On the other hand, during normal use in which the insulating gas is sealed in the container 13 at a pressure higher than the atmospheric pressure, the pressure release plate 18 is slightly deformed outward, and this state is maintained.

When the internal pressure of the container 13 rises abnormally due to an internal short circuit accident or the like, as shown in FIG. 4, the pressure relief plate 18 deforms the bent portion of the cap portion 18a and the collar portion 18b to the outside. At this time, the outer peripheral edge of the collar portion 18b enters the packing groove 16 while deforming the packing 17, and at the same time, the clearance between the inner peripheral upper edge of the packing groove 16 and the inner peripheral lower edge of the pressing plate 19 is increased. Utilizing this, the collar portion 18b slides upward, and the entire pressure release plate 18 completely slips out, so that the pressure release port 15 is opened and pressure is released.

[0020]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. The inner diameter of the flange of the hat-shaped pressure release plate that covers the pressure relief port of the pressure vessel from the outside is made larger than the diameter of the pressure relief port to ensure the strength of the pressure relief plate when the container is evacuated. The inner diameter of the presser plate that presses the collar is made slightly larger than the inner diameter of the packing groove that is recessed outside the pressure relief port, and the deformation of the pressure relief plate when the internal pressure rises causes the collar to slip. Since the relief is formed so that it can be easily released, and the pressure is released by pulling out the entire pressure relief plate, it is not necessary to carefully select the material of the pressure relief plate as compared with the conventional pressure relief due to shearing, and this is also pressed. It can be easily molded by processing, etc., and is easy and inexpensive to produce.

[Brief description of drawings]

FIG. 1 is a cut front view showing an embodiment of a pressure relief device according to the present invention.

2 is a perspective view of the pressure relief plate of FIG. 1. FIG.

FIG. 3 is an enlarged view of a part of FIG.

FIG. 4 is a partial enlarged view showing a pressure release operation in FIG.

5A and 5B show a conventional pressure relief device, FIG. 5A is a cut side view, and FIG. 5B is a front view of a pressure relief plate.

FIG. 6 shows another conventional pressure relief device, (A) is a cut side view, and (B) is a front view of a pressure relief plate.

[Explanation of symbols]

 13 Pressure Vessel 15 Pressure Release Port 16 Packing Groove 17 Packing 18 Pressure Release Plate 18b Collar 19 Presser Plate

Claims (1)

[Claims for utility model registration] [Claim 1] A circular pressure release port formed in a pressure vessel,
An annular packing groove recessed in the outer surface of the container on the outside of the pressure release port, a packing mounted in the packing groove, and a cap-shaped cap are formed, and the inner diameter of the flange portion is equal to that of the pressure release port. Is formed to be larger than the inner diameter of the packing groove and smaller than the inner diameter of the packing groove, and the outer diameter of the flange is formed to be larger than the inner diameter of the packing groove and smaller than the outer diameter of the packing groove. The pressure-release plate closed from the outside of the container, and the inner diameter formed slightly larger than the inner diameter of the packing groove and smaller than the outer diameter of the flange portion, and the flange portion is pressed against the outer surface of the container through the packing. Pressure release device provided with the above-mentioned annular pressing plate.