JPS6234628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulated tank in a liquid carrier.

Conventional insulated tanks for vehicles that transport high-viscosity liquids such as asphalt and fatty acids have a wall thickness (approximately An outer tank 02 with a diameter of 1.6 mm) is provided, and a heat insulating material is filled between the inner and outer tanks 01 and 02, and an appropriate number of reinforcing girders are interposed. Furthermore, the lower end of a protective frame 03 for protecting a manhole formed at the top of the inner tank 01 in the event of a rollover is welded to the upper part of the inner tank 01, and the upper part thereof is made to protrude above the outer tank 02. Further, on the upper part of the inner tank 01 and on the outside of the protective frame 03, a side frame 04 is provided to prevent the tank from rolling over at a predetermined angle or more and to prevent damage to the manhole. The inner tank 01 has a structure in which the side ends are welded to the protection frame 03, the upper part is made to protrude from the outer tank 02, and the middle part of the side frame 04 is welded to the outer tank 02.

However, in the case of the above structure, since the inner tank is in direct contact with the high temperature liquid contained therein, the inner tank expands and contracts in the longitudinal direction due to the heat.
At the same time, the side frame welded to the inner tank will also move. However, because heat is not transferred to the outer tank, it does not expand and contract like the inner tank does, and as a result, stress concentrates in the corners of the outer tank that are cut out for the side frame, causing cracks. There was a problem.

In order to solve the above-mentioned problems, the present invention makes the wall thickness of the outer tank almost the same as that of the inner tank, and also provides a protective frame and side frames on the outer tank so that the expansion and contraction of the inner tank can be controlled by the protective frame and side frames. This is to prevent it from being transmitted to the frame.

An example will be explained below with reference to drawings. Reference numeral 1 denotes an insulated tank mounted on a vehicle. The insulated tank 1 has a double structure consisting of an inner tank 2 and an outer tank 3 in order to keep liquids such as asphalt and fatty acids at high temperatures. is doing.

The inner tank 2 is formed into a cylindrical shape from a steel plate with a wall thickness of about 3.2 mm, and is designed to be able to withstand internal pressure sufficiently.

The outer tank 3 consists of an upper outer tank 4 with approximately the same thickness as the inner tank 2 and a lower outer tank 5 with a thinner wall thickness (approximately 1.6 mm) than the inner tank 2. Both ends of the upper and lower outer tanks 4 and 5 are The outer tank 3 is welded to the end of a support girder 6 integrally erected on the surface of the inner tank 2, so that the outer tank 3 covers the entire inner tank 2, leaving a space.

The space between the inner tank 2 and the outer tank 3 is filled with a heat insulating material 7 such as glass wool to keep the inner tank 2 warm.

A manhole 8 for pouring liquid is formed at the top of the inner tank 2, and a manhole cover 9 and a heat insulating cover 10 made of a heat insulating material are provided on the manhole 8 to prevent heat radiation from the manhole.

Reference numeral 11 denotes a protective frame provided in the longitudinal direction of the upper outer tank 4 to surround the manhole 8 in order to prevent damage to the manhole 8 when a vehicle overturns.
1 is formed into an inverted V-shape in cross section by bending the upper part of the upper outer tank 4, which is bent into an arc shape, upward and further bending the upper end downward. An end of the protection frame 11 is welded to an end of a cross-sectional top plate 12 provided above the inner tank 2.

13... is a side frame for minimizing the rollover angle and preventing damage to the manhole 8 when a vehicle rolls over.The side frames 13... are provided at front, rear, left and right positions on the outside of the protection frame 11, and By welding the lower end of the frame 13 to the surface of the upper outer tank 4 and the side edges to the outer surface of the protective frame 11, the side frame 13...
is integrated with the upper outer tank 4.

With the above structure, even if the inner tank 2 expands and contracts in the longitudinal direction of the inner tank 2 due to the heat of the liquid, the protective frame 11 and the side frames 13 are provided in the upper outer tank 4, so that the inner tank 2 expands and contracts as the inner tank 2 expands and contracts. There is no movement.

Furthermore, since the upper outer tank 4 has a wall thickness that is approximately the same as that of the inner tank 2, it is possible to obtain sufficient strength to support the protection frame 11 and the side frames 13.

FIG. 3 shows another embodiment in which a protection frame 16 with an inverted V-shaped cross section for protecting a manhole 15 is welded to the surface of the upper outer tank 14, and a side frame 17 is further welded to the upper outer tank 14 and the protection frame 16. However, the protection frame 16 and the side frame 17 are each integrally formed with the upper outer tank 14.

As described above, in the present invention, the outer tank is formed with approximately the same wall thickness as the inner tank, and the protective frame and side frame are fixed to the outer tank, so that the inner tank does not expand or contract due to the heat of the liquid. However, the protective frame and side frame do not move as a result, and it reliably prevents cracks in the outer tank and deformation of the outer tank, side frame, and protective frame as in the conventional case. can do. Further, heat inside the tank is no longer transmitted to the protective frame or side frame and radiated to the outside as in the conventional case, and heat can be reliably maintained.

[Brief explanation of the drawing]

FIG. 1 is an overall view, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is another embodiment, and FIG. 4 is a conventional example. 1 is a heat insulating tank, 2 is an inner tank, 3 is an outer tank 11 is a protective frame, and 13 is a side frame.

Claims (1)

[Claims] 1. An outer tank having approximately the same thickness as the inner tank is provided at regular intervals outside the inner tank, a heat insulating material is filled between the inner and outer tanks, and an inner tank is placed above the outer tank. A protective frame that protects the manhole formed at the top is erected on the top surface of the outer tank, separated from the inner tank, and a side frame is provided between the outer surface of the protective frame and the top surface of the outer tank, separated from the inner tank. Insulated tanks in liquid carriers. 2. The heat insulating tank for a liquid transport vehicle according to claim 1, wherein a part of the outer tank and the protective frame are integrally formed by bending a single plate. 3. The heat insulating tank for a liquid transport vehicle according to claim 1, wherein the lower end of the protective frame is welded to the surface of the outer tank.