JPS5829033Y2 - Rapture hatch - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a love charm.

Conventionally, the Loveture Hatch, which prevents danger by releasing the tank internal pressure that has suddenly increased in oil tanks, etc., has a partially spherical head plate welded inside the hatch coaming with the top facing downward, so that when the tank internal pressure rises, There is one in which the welded parts around the head plate buckle and break at the same time that the top of the head plate is turned upward, causing the head plate to blow off.

However, because the head plate is thin, in such a love hatch, even if the center part including the top of the head plate is turned over, the welded parts around the periphery will not easily turn over or break because tensile stress is generated uniformly. Something happened.

The present invention aims to propose a love hatch which does not have such drawbacks and whose end plate is reliably reversed and blown off when the internal pressure of the tank reaches a predetermined value.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The love hatch of the present invention will be explained below based on illustrative drawings.

1 is a deck of an oil tank, 2 is a circular hatch, 3 is a cylindrical hatch coaming provided around the hatch 2 on deck 1, and 4 is a partially spherical shape installed in the hatch coaming 3 with the top facing downward. The strength of the head plate is set so that the top part of the tank is turned upward at a predetermined tank internal pressure, for example, 0.4 kg/Cm2.

The outer diameter of the end plate 4 is slightly smaller than the inner diameter of the hatch combing 3, and its periphery is coated with an adhesive coating agent 5. A backing 6 made of synthetic rubber having a U-shaped cross section is applied thereon, and the backing 6 is made of synthetic rubber and has a U-shaped cross section. It seals the space between them.

The adhesive coating 5 and the backing 6 are suitably made of silicone rubber, which has excellent water resistance, heat resistance, and weather resistance.

Denoted at 7 are claws welded and fixed to the inner peripheral surface of the hatch coaming 3 at regular intervals in the circumferential direction, and support the mirror plate 4 on the lower side via the backing 6.

Numeral 8 is a bolt that presses the upper surface of the backing 6, and the end plate 4 is fixed within the hatch coaming 3 by the claw 7 and the bolt 8.

Like the claws 7, the bolts 8 are provided on the inner circumferential surface of the hatch coaming 3 at regular intervals in the circumferential direction, and pass through the peripheral wall of the hatch coaming 3.

The bolt 8 is provided to support the tank internal pressure applied to the end plate 4, and its diameter is, for example, when the inner diameter of the hatch coaming 3 is 1.5 m and the predetermined breaking pressure is 0.4 kg/cm.
If it is 2, then when 12 pieces are installed as shown in the figure, about 7 mm is sufficient.

In the above configuration, when the internal pressure of the tank increases, the end plate 4 tries to extend its circumference and presses against the backing 6, so that the seal with the hatch coaming 3 becomes more complete.

The pressure increases further, and when it reaches a predetermined pressure, the end plate 4 is reversed, and at the same time, a tremendous pressure is applied to the top that has been reversed upward.
The surrounding area goes over the tip of the bolt 8, and the end plate 4 is blown off to the outside of the hatch coaming 3.

According to the hatch coaming of the present invention, the partially spherical end plate, which is installed with the top facing downward in the hatch coaming, has a peripheral edge that is not welded to the hatch coaming.
Contact the inner circumference of the hatch combing through the backing,
Since this head plate is only clamped and fixed at multiple points in the circumferential direction by upper and lower supporting members provided on the inner circumference of the hatch coaming, when this end plate is subjected to a predetermined internal pressure in the tank, the top will surely turn upward and the peripheral edge will turn upward. It can overcome the upper support member and be blown off to the outside of the hatch combing, thereby preventing danger.

Furthermore, if the upper support member is made of a bolt that passes through the peripheral wall of the hatch coaming as shown in the embodiment, the backing of the head plate can be easily replaced and maintenance is relatively simple.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, FIG. 3 is a view taken along line B-B in FIG.
The figure is a sectional view of the main part. 3...hatch combing, 4...end plate, 6...backing, 7...nail, 8...
·····bolt.

Claims (1)

[Scope of utility model registration request] A backing for sealing between the hatch coaming and the hatch coaming is attached to the periphery of a partially spherical end plate that is attached to the inner periphery of the hatch coaming with its top facing downward. A loveture hatch with a head plate fixed through upper and lower support members that hold it in place.