High-pressure oil tank with assembly type reinforced stand column

Abstract

The utility model relates to a high-pressure oil tank with an assembly type reinforced stand column. The high-pressure oil tank comprises an upper shell, a lower shell, the assembly stand column, an embedded support and a welding cover plate. Wherein the upper shell and the lower shell are formed through a traditional blow molding process, the embedded support is arranged on the inner surface of the lower shell, and the embedded support and the shell are integrally formed in the blow molding process; a round hole groove is formed in the upper shell, the assembling stand column penetrates through the round hole groove and is fixed between the upper shell and the lower shell through the embedded support and the welding cover plate, and the oil tank manufactured through a traditional blow molding process is matched with the assembling stand column to achieve design and manufacturing of the high-pressure oil tank. Therefore, the dependence of the high-pressure oil tank on high-end two-piece blow molding equipment and tools can be reduced, the manufacturing cost of the high-pressure oil tank is greatly reduced, and the manufacturing universality of the high-pressure oil tank is improved.

Description

Technical Field

[0001] The present application relates to an oil tank, in particular to a high-pressure oil tank with assembled reinforcement columns, belonging to the technical field of oil tank structural components. Background Art

[0002] When the plastic fuel tank of a hybrid or extended-range vehicle is sealed for a long time (using only electricity and not fuel), the internal pressure will continue to increase with the temperature. Depending on the working capacity of the isolation valve, the pressure can reach over 30kPa. At this time, the deformation problem of the fuel tank is particularly obvious. However, from a safety perspective, the OEM has strict requirements on the deformation size, so the industry has been focusing on the research, development, innovation and upgrading of high-pressure fuel tanks. At present, the widely used anti-deformation strategy for high-pressure plastic fuel tanks is to arrange reinforcement structures inside the tank, such as built-in reinforcement columns. However, the built-in columns are usually connected to the inner surface of the tank by welding, such as Figure 1 To achieve the internal welding of the built-in pillars and the fuel tank, this must be done during the tank blow molding process, requiring the use of a two-piece blow molding process and equipment. (Major professional fuel tank manufacturers have extensive patents for the design, process, and equipment of two-piece blow-molded fuel tanks, which will not be repeated here.) The two-piece blow-molded fuel tank process is complex, the equipment is expensive, and the manufacturing cost is high, which limits the manufacturing of high-pressure fuel tanks. Therefore, a new solution to this technical problem is urgently needed. Summary of the Invention

[0003] This application addresses the technical issues existing in the prior art by providing a high-pressure fuel tank with assembled reinforcement columns. This technical solution is ingeniously designed and compact, utilizing a conventional blow-molded fuel tank in conjunction with assembled reinforcement columns to achieve the design and manufacture of the high-pressure fuel tank. This reduces the high-pressure fuel tank's reliance on high-end two-piece blow-molding equipment and tooling, significantly reducing its manufacturing cost and increasing its universality.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present application is as follows: a high-pressure oil tank with assembled reinforced columns, the high-pressure oil tank including upper and lower shells, assembly columns, embedded brackets and welded cover plates; wherein, the upper and lower shells are formed by traditional blow molding process, the embedded brackets are arranged on the inner surface of the lower shell, and are integrally formed with the shell during the blow molding process; the upper shell is provided with a circular hole groove, the assembly column passes through the circular hole groove, and is fixed between the upper and lower shells by the embedded brackets and the welded cover plate.

[0005] As an improvement of the present application, the embedded bracket is pre-placed in the fuel tank mold. When the fuel tank is conventionally blow-molded, the blank and the bracket in the mold are combined by plastic wrapping so that the local structure of the inner surface of the fuel tank forms the shape of the bracket, thereby forming a fuel tank slot structure. There is an open hole structure on the bracket so that the fuel tank material can pass through the bracket, thereby increasing the pulling force of the connection between the two.

[0006] As an improvement to this application, the assembly column is generally cylindrical, with one end being cylindrical and the other being a cuboid. One end of the cuboid is designed to mate with the fuel tank slot. The column body is a honeycomb-shaped polyhedron. One end of the cylinder has one or more grooves on its upper surface to prevent rotation. The cylinder has a diameter of D1. The length of one end of the cuboid is L, and the width is W.

[0007] As an improvement of the present application, the overall shape of the cover is a dome-shaped cover, and the surface has an anti-rotation structure that matches one or more assembly columns. The inner diameter is D2, D2>D1 to ensure that it can cover the column. It is recommended that D2=D1+(2-4)m

[0008] As an improvement of the present application, the number of assembly columns is at least one, and the number of embedded brackets and welding cover plates is the same as the number of assembly columns.

[0009] As an improvement to this application, the assembly process is as follows:

[0010] 1) One end of the column is close to the round hole of the oil tank. Figure 7 , put one end of the assembly column through the circular hole downward, and put the column vertically into the oil tank opening. The length of the column end is shorter than the opening, so it can directly enter the hole;

[0011] 2) After the rectangular end of the column reaches the bottom tank slot, rotate the cylindrical end of the column 90°. At this time, the rectangular end of the column is also rotated 90°. Because the length of the rectangular end is greater than the width of the slot, the rectangular end will be stuck.

[0012] 3) Finally, align the mark on the welding cover with the mark on the column and weld it to the fuel tank to achieve sealing and final fixation.

[0013] Compared with the existing technology, the present application has the following advantages: 1. The present application realizes the function of a high-pressure fuel tank by assembling a reinforcing column inside the fuel tank formed by the traditional blow molding process, thereby reducing the high-pressure fuel tank's dependence on high-end two-piece blow molding equipment and tooling, greatly reducing the manufacturing cost of the high-pressure fuel tank, and improving the manufacturing universality of the high-pressure fuel tank; 2. When a hybrid vehicle is not used for a long time, the pressure in the enclosed space inside the fuel tank will greatly increase or decrease with temperature changes, resulting in excessive deformation of the fuel tank, which may seriously cause the fuel tank to rupture or contact other parts of the vehicle body to cause fuel leakage. Therefore, this study strengthens the fuel tank by assembling columns to reduce deformation caused by tank pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the fuel tank produced using the two-piece technology.

[0015] Figure 2This is the schematic diagram of the fuel tank structure for this application.

[0016] Figure 3 This is a schematic diagram of the assembly column structure.

[0017] Figure 4 is a schematic diagram of the cover structure.

[0018] Figure 5 This is a schematic diagram of the embedded bracket structure.

[0019] Figure 6 This is a schematic diagram of the embedded bracket and shell after molding.

[0020] Figure 7-12 Schematic diagram of the assembly process.

[0021] In the figure: 1. Shell, 2. Welding cover, 3. Round hole groove, 4. Assembly column, 5. Fuel tank slot, 6. Embedded bracket, 7. Built-in column. DETAILED DESCRIPTION

[0022] In order to deepen the understanding of this application, this embodiment is described in detail below with reference to the accompanying drawings.

[0023] Example 1: See Figure 2 A high-pressure fuel tank with assembled reinforcement columns comprises upper and lower shells 1, assembly columns 4, embedded brackets 6, and a welded cover plate 2. The upper and lower shells are formed using a conventional blow molding process, with the embedded brackets positioned on the inner surface of the lower shell and integrally formed with the shells during the blow molding process. The upper shell has a circular slot 3 through which the assembly columns 4 pass and are secured between the upper and lower shells via the embedded brackets and the welded cover plate. The embedded brackets are pre-placed in the tank mold. During conventional blow molding of the tank, the preform and the brackets in the mold are overmolded, forming a tank slot structure with a localized structure on the inner surface of the tank shaped like the brackets. The brackets have openings that allow the tank material to pass through the brackets, thereby increasing the pull-out strength of the connection. The assembly columns are generally columnar, with one end being cylindrical and the other being a cuboid. One end of the cuboid is used to mate with and secure the tank slot. The column body is a honeycomb-shaped polyhedron, with one end of the cylinder having one or more grooves on its upper surface to prevent rotation. The overall shape of the cover is a round cover, and the surface has an anti-rotation structure that matches one or more assembly columns. The number of assembly columns is at least one, and the number of embedded brackets and welded cover plates is the same as the number of assembly columns.

[0024] Example 2: Figure 2It is a high-pressure plastic fuel tank with assembled reinforced columns, including a fuel tank, assembled columns (at least one, the number and position of the columns are determined according to the size and structure of the fuel tank), embedded brackets 6 (the number is equal to the number of columns), and welded covers 2 (the number is equal to the number of columns). In the state where the columns are assembled in place, the lower ends are restricted and fixed by the slot structure at the bottom of the fuel tank, and the upper ends are restricted and fixed by the opening slots of the fuel tank and the welded covers (after the covers are welded to the fuel tank, the welding pulling force is very large, and it can be regarded as a part of the upper surface of the fuel tank). The height of the column is H1, and the vertical distance from the slot at the bottom of the fuel tank to the welded cover on the upper surface is H2, and H1 < H2. It is recommended that in the theoretical state, H2 = H1 + (2 - 4) mm. When the internal pressure of the fuel tank increases and is greater than the atmospheric pressure, the upper and lower surfaces of the fuel tank deform outward. However, due to the slot structure on the lower surface and the opening slots on the upper surface being pulled by the two ends of the rigid columns, this area hardly deforms and greatly alleviates the outward deformation of the surrounding area. When the internal pressure of the fuel tank decreases and is less than the atmospheric pressure, the upper and lower surfaces of the fuel tank deform inward. However, due to the bottom of the slot on the lower surface and the welded cover on the upper surface being supported by the two ends of the rigid columns, this area hardly deforms and greatly alleviates the inward deformation of the surrounding area.

[0025] The shape and structure of the column are as Figure 3 , the whole is columnar, one end is a cylinder, the other end is a cuboid, and the column body is a honeycomb polyhedron. There is one or more grooves on the upper surface of one end of the cylinder for anti-rotation, and the cylinder diameter is D1. The length of one end of the cuboid is L, and the width is W1.

[0026] The shape and structure of the welded cover 2 are as Figure 4 , the whole is in the shape of a round cover, and the surface has one or more anti-rotation structures matching the columns. The inner diameter is D2, and D2 > D1 to ensure that the column can be covered. It is recommended that D2 = D1 + (2 - 4) mm.

[0027] The shape and structure of the embedded bracket 6 are as Figure 5 , the bracket is pre-placed in the fuel tank mold. When the fuel tank is traditionally blow-molded, the blank and the bracket in the mold are plastically combined, so that the local structure on the inner surface of the fuel tank forms the shape of the bracket, thus forming a slot structure feature. There are opening structures on the bracket to allow the fuel tank material to pass through the bracket, thereby increasing the pulling force of the connection between the two.

[0028] The slot structure on the inner surface of the formed fuel tank is as Figure 6 , the width of the upper end of the slot is W2, and the width of the lower end is W3. The design makes W1 < W2 < L < W3, so as to ensure that the column can enter the slot along the up and down direction and be fixed by the slot. It is recommended that L = W2 + (10 - 14) mm and W3 = L + (4 - 6) mm.

[0029] After the fuel tank is formed, a round hole is drilled at the position directly above the upper surface slot of the fuel tank. The diameter of the drilled hole is D3, and it is designed such that L < D3 < D1, so that one end of the rectangular column can be inserted into the fuel tank through the drilled hole, while the cylindrical end cannot enter the fuel tank and can be stuck by the drilled hole slot. It is recommended that D1 = D3 + (8 - 10) mm.

[0030] Embodiment 3: Refer to Figure 3 、 Figure 4 、 Figure 6 , Figure 7 After the fuel tank is drilled, the column assembly is carried out. The assembly process is as follows: 1) One end of the rectangular column of the column is close to the drilled hole of the fuel tank as Figure 7 ,The arrow of the cylindrical end is aligned with the start arrow of the fuel tank as Figure 8 ,The column is vertically inserted into the fuel tank through the drilled hole. The length of the rectangular column end is less than the drilled hole, so it can directly enter the hole;

[0031] 2) Since the width of one end of the rectangular column of the column is less than the width of the bottom slot, it can directly enter the slot. Since the diameter of the cylindrical end of the column is greater than the drilled hole, the column will not enter the fuel tank as a whole. And due to the height limit and gravity of the column, the column will be vertically hanging at the drilled hole of the fuel tank at this time, as Figure 9 shown

[0032] 3) Rotate the cylindrical end of the column by 90°, so that the arrow on the column is aligned with the end arrow on the fuel tank. At this time, the rectangular column end of the column also rotates by 90°. Since the length of the rectangular body is greater than the width of the slot, the rectangular body end will be stuck, as Figure 11 .

[0033] 4) Finally, align the mark of the welded cover plate with the mark on the column and weld it to the fuel tank to achieve sealing and final fixation, as Figure 12 ,Refer to the final state Figure 2 .

[0034] It should be noted that the above embodiments are not used to limit the protection scope of this application. Any equivalent transformation or substitution made based on the above technical solutions falls within the protection scope of the claims of this application.

Claims

1. A high-pressure oil tank with assembled reinforcement columns, characterized in that: The high-pressure oil tank includes upper and lower shells, assembly columns, embedded brackets and welded cover plates; Among them, the upper and lower shells are formed by traditional blow molding process, the embedded bracket is arranged on the inner surface of the lower shell, and is formed integrally with the shell during the blow molding process; the upper shell has a circular hole groove, the assembly column passes through the circular hole groove, and is fixed between the upper and lower shells by the embedded bracket and the welded cover plate.

2. A high-pressure oil tank with assembled reinforcement columns according to claim 1, characterized in that: The embedded bracket is pre-placed in the fuel tank mold. When the fuel tank is traditionally blow-molded, the blank and the bracket in the mold are combined by plastic overmolding, so that the local structure of the inner surface of the fuel tank forms the shape of the bracket, thereby forming a fuel tank slot.

3. A high-pressure oil tank with assembled reinforcement columns according to claim 2, characterized in that: The assembly column is columnar as a whole, with one end being a cylinder and the other end being a cuboid. One end of the cuboid is used to match and fix with the fuel tank slot. The column body is a honeycomb polyhedron, and one end of the cylinder has one or more grooves on its upper surface.

4. A high-pressure oil tank with assembled reinforcement columns according to claim 1, characterized in that: The overall shape of the welding cover plate is a round cover, and the surface is provided with an anti-rotation structure that matches one or more assembly columns.

5. The high-pressure oil tank with assembled reinforcement columns according to claim 1, characterized in that: The number of assembly columns is at least one, and the number of embedded brackets and welding cover plates is the same as the number of assembly columns.

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