Oil tank baffle set

Abstract

To provide a baffle set of oil tanks with baffles installed inside the oil tanks to reduce the adverse effects of heating or deformation on the body of ground-mounted oil tanks and to reduce the sudden bias of oil in the tank due to lateral shaking caused by earthquakes.SOLUTION: A baffle set is provided with two or more baffles with connecting parts and one or more reinforcing frames that hold the baffles at regular intervals, in which the baffles are installed in the oil tank by welding them to the inner wall of the oil tank.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a baffle set for use in a ground-mounted oil tank, and more particularly to a baffle set for an oil tank for improving the earthquake resistance of the oil tank. [Background technology]

[0002] Japan is a country where earthquakes occur frequently, so there are ground-mounted oil tanks that have been designed to be earthquake-resistant. For example, the oil tank shown in Figure 5 has legs designed to withstand an earthquake design intensity of 0.6. The oil tank shown in Figure 6, which has been further strengthened in earthquake resistance, has legs designed to withstand an earthquake design intensity of 1.0. In Figure 6, braces have been added to the legs to strengthen earthquake resistance. In this way, strengthening the legs has traditionally been used as a measure to increase earthquake resistance.

[0003] As another measure to strengthen earthquake resistance, Patent Document 1 discloses a device in which mounting bases 1c of a predetermined height are provided on the left and right sides of cabinet 1 to mitigate earthquake vibrations and prevent damage to the fuel tank and fuel leakage, an oil barrier 5 containing a fuel tank 4 is placed between the left and right mounting bases 1c, left and right portions of oil barrier 5 are attached to mounting base 1c via vibration-isolating rubber 6 so that the bottom of oil barrier 5 is raised, and restricting devices 7 are provided to restrict the swaying displacement of oil barrier 5 to a predetermined range. As a result, even if an earthquake occurs, the vibrations are absorbed, damped, and mitigated by vibration-isolating rubber 6 and transmitted to fuel tank 4 in a small amount, making it less likely that fuel tank 4 will be damaged or that fuel will leak. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3181450 Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, the applicant thought that the heaviest part of a ground-mounted oil tank is the oil, such as kerosene or diesel, contained in the oil tank, and that if the sudden imbalance of oil caused by lateral shaking during an earthquake could be reduced, damage to the tank body and legs due to momentary imbalance of load could be prevented.

[0006] To date, earthquake countermeasures for ground-mounted oil tanks have included strengthening the earthquake resistance of the legs as described above, and using vibration-damping rubber to absorb, dampen, and mitigate earthquake vibrations. However, no measures have been taken to install any kind of device inside the oil tank to reduce the sudden shift in oil caused by lateral shaking due to an earthquake.

[0007] On the other hand, in the fuel tank of an automobile, a baffle is installed in the fuel tank to reduce flow noise caused by the sudden flow of fuel due to sudden starts, sharp turns while driving, sudden stops, etc. of the vehicle.

[0008] Methods for installing a baffle inside an automobile fuel tank include joining the baffle to the inner wall of the fuel tank by spot welding, fillet welding, etc., joining one side of an L-shaped stopper to the inner wall of the fuel tank by spot welding, etc., and abutting the other side against the baffle to secure the baffle, and using a crimping process to secure the baffle by plastically deforming the body of the fuel tank and the baffle into the same shape and engaging these parts with each other. Furthermore, a combination of the above methods may be used to fix the baffle inside the fuel tank, for example, by using a combination of crimping and an L-shaped stopper.

[0009] However, the above-mentioned methods of welding the baffle to the inner wall of the fuel tank and the method of welding the stopper to the inner wall of the fuel tank locally heat the body of the oil tank to high temperatures, which can cause welding distortion in the body of the oil tank due to the heat, and can even cause deformation of the body of the oil tank. Furthermore, the crimping process causes plastic deformation of the body of the oil tank and the baffle, which can harden the deformed parts and cause cracks.

[0010] Therefore, an object of the present invention is to provide a baffle set for an oil tank in which baffles are installed inside the oil tank to reduce the adverse effects of heating or deformation on the body of a ground-mounted oil tank and to reduce sudden oil imbalance due to lateral shaking caused by an earthquake. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides a baffle set comprising two or more baffles having a communicating portion and one or more reinforcing frames that hold the baffles at a fixed interval, wherein the baffles are welded to the inner wall of the body of the oil tank, thereby installing the baffle set inside the oil tank.

[0012] A baffle set is installed inside an oil tank to reduce the sudden shifting of oil flow due to lateral shaking caused by an earthquake. In the baffle set of the present invention, the baffles are welded to the inner wall of the oil tank, but the reinforcing frame firmly holds the front and rear baffles in place, preventing fatigue cracks from occurring at the welded baffles even when the baffles are repeatedly subjected to the force of sudden oil flow caused by lateral shaking caused by an earthquake. The advantage of using a reinforcing frame is that it only contacts the baffles, not the inner wall of the oil tank. This eliminates the need to heat and plastically deform the oil tank body, as is the case with the L-shaped stopper and crimping process described above, and therefore does not adversely affect the oil tank body. Furthermore, by increasing the number of reinforcing frames as needed, the baffles can be reliably held in place even under severe conditions.

[0013] The communication portion of the baffle is characterized by being formed by cutting out the lower and / or upper portion of the baffle.

[0014] The communication section at the bottom of the baffle allows oil to circulate through the communication section when oil flows rapidly due to horizontal shaking caused by an earthquake, thereby mitigating excessive impact on the baffle. The communication section at the top of the baffle allows air to circulate through the communication section, thereby mitigating excessive impact on the baffle when air is suddenly compressed due to the rapid flow of oil caused by horizontal shaking caused by an earthquake.

[0015] The baffle is characterized by having an opening.

[0016] The openings in the baffle allow oil to flow through the openings when the oil flows rapidly due to horizontal shaking caused by an earthquake, thereby mitigating excessive shock to the baffle.

[0017] The baffle is characterized by a semicircular shape having a communicating portion at the bottom.

[0018] By reducing the area of ​​the baffle, excessive shock to the baffle caused by sudden oil shift due to earthquakes can be reduced. In this case, this can be done together with measures to strengthen the earthquake resistance of the legs.

[0019] The baffle is characterized by a circular shape having communicating portions at the top and bottom.

[0020] By increasing the area of ​​the baffle, it is possible to ensure that the baffle receives as much of the oil as possible when an earthquake occurs. Accordingly, the number of reinforcing frames may be adjusted to strengthen the baffle's support. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a baffle set of the present invention. [Figure 2] FIG. 2 is a partial cross-sectional perspective view of the body of an oil tank incorporating the baffle set of FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view of an oil tank incorporating the baffle set of FIG. 1. [Figure 4] FIG. 10 is a perspective view of another embodiment of a baffle set of the present invention. [Figure 5] FIG. 1 is a diagram of an oil tank with existing earthquake-resistant legs. [Figure 6] FIG. 1 is a diagram of an oil tank having legs of another existing earthquake-resistant structure. DETAILED DESCRIPTION OF THE INVENTION

[0022] Here, we will briefly explain the manufacturing process of a conventional ground-mounted oil tank. The manufacturing process of the oil tank shown in Figures 5 and 6 is as follows. Step 1: Manufacturing the body 110 of the oil tank 100 Step 2: Manufacturing the head portion 120 of the oil tank 100 Step 3: Making the legs 200 Step 4: The head portion 120 is attached to the body portion 110 by welding to produce the oil tank 100. Process 5: Inspection and processing of the welds of the oil tank 100 Step 6: Attaching the legs 200 to the oil tank 100 Step 7: Installing accessories such as the vent pipe 121 and oil gauge 111 in the oil tank 100 Process 8: Cleaning of the oil tank 100, dimensional inspection, and airtight pressure test

[0023] In the present invention, since the baffle set 150 is installed inside the body 110 of the oil tank 100 as shown in FIGS. 1 and 2, the following step is added before step 4 above. Step a: Making the baffle 160 Step b: Assembling the baffle 160 and the reinforcing frame 170 to produce the baffle set 150 Step c: Install the baffle set 150 in the body 110

[0024] Hereinafter, an embodiment of the present invention will be described with reference to Figures 1 to 4. In each figure, the same parts are denoted by the same reference numerals.

[0025] 1 is a perspective view of a baffle set 150 of the present invention. The baffle set 150 of the present invention is composed of a baffle 160 having a communication portion 131 at the bottom of the baffle 160, and a reinforcing frame 170.

[0026] The baffle 160 is made from a plate material. In FIG. 1, the baffle 160 is semicircular with a communication portion 131 at the bottom, and is provided with two L-shaped reinforcing frame openings 171 for passing the reinforcing frame 170 therethrough, and five circular openings 161. The material of the baffle 160 matches the material of the oil tank 100. For example, if the oil tank 100 is made of SUS304, the baffle 160 should also be made of SUS304. The number of baffles 160 can be selected as appropriate, provided it is two or more. In FIG. 1, two baffles are used.

[0027] In FIG. 1, angle iron is used as the reinforcing frame 170. Instead of angle iron, rod material, pipe material, flat bar material, channel material, etc. can be used for the reinforcing frame 170. The material should match the material of the oil tank 100. For example, if the oil tank 100 is made of SUS304, the reinforcing frame 170 should also be made of SUS304. The number of reinforcing frames 170 can be selected appropriately as long as it is one or more. In FIG. 1, two angle irons are used.

[0028] The reinforcing frame 170 is joined to the baffle 160 by butt welding. Specifically, the L-shaped end of the reinforcing frame 170 is passed through the L-shaped reinforcing frame opening 171 of the baffle 160, and the outer surface of the baffle 160 and the L-shaped end face of the reinforcing frame 170 are adjusted so that they are at the same level. The baffle 160 and the reinforcing frame 170 are then joined by butt welding from the outside of the baffle 160. In butt welding, the range of the groove, i.e., the range for complete penetration, can be selected appropriately. After butt welding one end of the angle bar of the reinforcing frame 170, the other end is butt welded to the other baffle 160. The second reinforcing frame 170 is also joined to the two baffles 160 by butt welding, similar to the first reinforcing frame 170.

[0029] The openings 161 are circular openings and are provided in five locations. The size and number of the openings can be selected as appropriate. The shape of the openings 161 can also be selected as appropriate, other than circular. For example, they may be oval openings that are long in the vertical direction.

[0030] FIG. 2 shows the baffle set 150 of FIG. 1 assembled into the barrel 110 of the oil tank 100. The baffle set 150 is fixed to the barrel 110 by fillet welding each baffle 160 of the baffle set 150 to the inner wall of the barrel 110 from the inside of the barrel 110. In FIG. 2, one baffle 160 has been fillet welded to the inner wall of the barrel 110 at three locations on one side, for a total of six locations on both sides. The other baffle 160 has been similarly fillet welded at a total of six locations. The range of fillet welds to be applied can be selected as appropriate. For example, fillet welding may be applied to all of the contact points between the baffle 160 and the barrel 110.

[0031] Furthermore, in order to minimize the thermal effects of welding on the barrel 110, the fillet welding between the baffle 160 and the barrel 110 may be limited to, for example, one location on one side of the inner wall of the barrel 110, for a total of two locations on both sides. In this case, a stronger reinforcing frame may be used to maintain seismic strength. For example, angle iron may be changed to channel iron, or the number of reinforcing frames used may be increased.

[0032] Fig. 3 shows a cross-sectional view of the oil tank 100 after the baffle set 150 has been installed. Fig. 3(a) is a cross-sectional view from the side, and Fig. 3(b) is a cross-sectional view from the front. In Fig. 3, accessories such as the vent pipe 121 and oil gauge 111 that are normally installed are omitted.

[0033] In Figure 3, two baffles 160 are installed in the oil tank 100, and the lower half of the oil tank 100 is divided into three chambers. The number of baffles can be selected appropriately. For example, if three baffles are used, the lower half of the oil tank 100 is divided into four chambers.

[0034] FIG. 4 shows another embodiment of a baffle set 150 of the present invention. The baffle 160 is circular and has communication sections 131 at the top and bottom, and is provided with four L-shaped reinforcing frame openings 171 for passing the reinforcing frame 170 therethrough, and ten circular openings 161. The reinforcing frame 170 uses four angle irons 170. When the baffle set 150 of FIG. 4 is installed in the oil tank 100, the interior of the oil tank 100 is divided into three chambers. Of course, the number of baffles and the type or number of reinforcing frames can be selected as appropriate. [Explanation of symbols]

[0035] 100 Oil Tank 110 Torso 111 Oil level gauge 112 Fuel filler 113 Return Entrance 114 Drainage outlet 120 head 122 Oil Outlet 121 Ventilation pipe 131 Communication section 150 baffle set 160 Baffle 161 Opening 170 Reinforcement Frame 171 Reinforcement frame opening 200 Legs 210 Post 220 Crossbeam 230 Brace 240 Bracket 250 base plate

Claims

1. A baffle set for an oil tank, comprising two or more baffles each having a communicating portion and one or more reinforcing frames that hold the baffles at a fixed interval, wherein the baffles are welded to the inner wall of the oil tank, thereby installing the baffle set inside the oil tank, and the shape of the baffle is composed only of a semicircle having a communicating portion at the bottom.

2. 2. The baffle set for an oil tank according to claim 1, wherein the baffle has an opening.

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