JPS5812792Y2 - Rapture hatch - Google Patents

Description

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

Conventionally, the love hatch was designed to quickly blow off the lid when the internal pressure of the tank suddenly increased, avoiding danger.A partially spherical end plate was welded to the inner periphery of the hatch coaming with the top facing downward, and the end plate was blown off as the internal pressure rose. The top of
There is one in which the welded part on the periphery buckles and breaks when it is flipped in two directions, causing the end plate to blow off.

However, in such a structure, since the mirror plate is thin, even if only the center portion including the top is reversed, the tensile stress acts evenly on the welded periphery and the mirror plate may not easily reverse and break.

The present invention aims to provide a love hatch which does not have such a fear and in which the entire end plate is reliably reversed and ruptured and blown away when the inside of the tank reaches a predetermined pressure.

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

1 is an oil tank tie, 2 is a circular hatch, 3 is a hatch coaming provided around the hatch 2 on the hook 1, and 4 is a partially spherical thin mirror plate installed inside the hatch coaming 3 with the top facing downward. It is.

The end plates 4 are intermittently welded to the inner periphery of the hatch coaming 3 on the upper surface of the periphery at equal intervals in the circumferential direction.

The total length of this welded part 5 is 10% to 2% of the entire circumference of the end plate 4.
Approximately 5% is appropriate.

Moreover, this welding part 5 has a constant pitch, and the normal fluctuating pressure (0.14~-0.07kg/cm2) acting on the end plate 4
) The bond should be weak enough to withstand.

The space between the end plate 4 and the hatch combing 3 between the welded portions 5 is sealed with a sealant such as silicone rubber that has excellent water resistance, weather resistance, ozone resistance, and heat resistance.

6 indicates the seal portion.

In the above configuration, when the internal pressure of the tank increases and reaches a predetermined pressure that causes the head plate 4 to turn over, the seal portion 6 attempts to turn over as the top side turns over, and the welded portion 5 is welded around the entire circumference. Since a larger bending load is concentrated per unit length than in the case of the head plate 4, it suddenly breaks and the head plate 4 is blown off.

According to the love ture hatch of the present invention, as explained above, the partially spherical end plate is installed inside the hatch coaming with the top facing downward, and the welding with the hatch coaming on the periphery is performed by intermittent welding at equal intervals in the circumferential direction. Therefore, when the top of the head plate turns over due to an increase in the internal pressure of the tank, the tensile stress generated around the weld concentrates on each of these welds, ensuring rupture.
This prevents the danger of the mirror plate being blown off.

The structure is simple, the sealant can be replaced as needed, so manufacturing costs are low, and maintenance is relatively easy.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 3...Hatchcombing, 4...End plate, 5...Welded part,
6...Seal part.

Claims (1)

[Scope of utility model registration request] A love ture hatch in which a partially spherical end plate is welded intermittently around the inner circumferential edge of the hatch coaming with the top facing downward, and the portions that are not welded between the end plate and the hatch coaming are sealed with a sealant.