A rotomolded urea tank and a drain thereof

Abstract

The utility model relates to a kind of rotational moulding urea tank and its pollution outlet, and the urea tank includes the pollution outlet of setting in box body ontology;Pollution outlet includes special-shaped aluminium alloy cylindrical matrix, gasket, residue blocking cover;Matrix has positioning boss, anti-drop groove, outer thread;Positioning boss is upwards from the upper end surface of matrix and projects;Anti-drop groove is set in the upper inner cylinder wall of matrix, is annular groove formed by the radial recess from inner cylinder wall, for filling rotational moulding material after rotational moulding;Outer thread is set in the lower part of matrix;Residue blocking cover is provided with internal thread, and it is fixed in the lower end part of matrix by with the outer thread assembly of matrix;Gasket is between residue blocking cover and the lower end part of matrix.This utility model pollution outlet, perfect solution rotational moulding urea tank pollution outlet seal is not strict, leakage, delamination, cracking and other problems, can be used on different rotational moulding urea tank, meet the performance requirement of rotational moulding urea tank.

Description

Technical Field

[0001] This utility model relates to a drain outlet for a urea tank, specifically a drain outlet for a rotomolded urea tank and a rotomolded urea tank having the drain outlet. Background Technology

[0002] Traditional urea tanks are typically blow-molded, with the drain outlet also made of plastic. The blow-molded structure has external threads to seal the urea solution. In contrast, rotational molding urea tanks are manufactured by first completing the cavity, then welding the drain outlet to it, inserting a special plug into the drain outlet threads, adding plastic powder, fixing the filling port fixture and sensor port fixture, and finally fixing the cavity. The tank is then placed in a heating furnace, where the furnace temperature is increased to melt the plastic powder inside the cavity. A robotic arm rotates 360 degrees, causing the molten plastic powder to adhere evenly to the inner wall of the cavity, thus forming the rotational molding urea tank.

[0003] With the rapid development of automotive lightweighting, individual urea tanks are gradually being replaced by integrated urea tanks. Defects such as delamination, splitting, and leakage at the drain outlet of rotomolded urea tanks need to be addressed.

[0004] Therefore, a special drain outlet for urea tanks used in rotational molding was designed, such as... Figure 6 , Figure 7 As shown, it includes a base and an aluminum alloy sleeve; the base is a cylindrical structure with internal threads and an annular groove on the upper outer circumference; the aluminum alloy sleeve is fitted over the base outside, below the annular groove, and welded to the urea tank body. However, the disadvantages of this drain outlet are that the bottom of the rotomolded structure has a protrusion, which prevents the urea from being completely drained, and the bottom seal does not directly act on the rotomolded layer, posing a risk of internal leakage.

[0005] Therefore, it is necessary to further improve the existing urea tank drain outlet to perfectly solve defects such as delamination, splitting, and leakage. Summary of the Invention

[0006] In order to solve the problems of internal leakage risk and incomplete urea discharge in existing rotomolded urea tanks that have defects such as delamination and cracking, this utility model proposes a rotomolded urea tank and its discharge port that can overcome internal leakage, provide a tight seal, and prevent delamination and cracking.

[0007] This utility model is achieved through the following technical solution: The aforementioned rotomolded urea tank drain outlet includes a base, a sealing gasket, and a slag discharge plug. The base is a shaped aluminum alloy cylindrical structure with a positioning boss, an anti-detachment groove, and external threads. The positioning boss extends upward from the upper end face of the base. The anti-detachment groove is located on the upper inner wall of the base and is an annular groove formed by radial indentation from the inner wall, used for filling the rotomolded material after rotomolding. The external threads are located on the lower part of the base. The slag discharge plug has internal threads and is fixed to the lower end of the base by assembly with the external threads of the base. The sealing gasket is located between the slag discharge plug and the lower end of the base.

[0008] The drain outlet of the rotomolded urea tank, wherein: the positioning boss is a ring structure or at least two small bosses evenly arranged along the circumference.

[0009] The drain outlet of the rotomolded urea tank, wherein the external thread is a T-type thread. A groove is provided at the lower end of the inner cylinder of the substrate.

[0010] The rotomolded urea tank drain outlet, wherein: the sealing gasket is a self-centering sealing gasket, having a base and a positioning part; the upper end face of the base is matched and pressed against the lower end face of the body; the positioning part protrudes upward from the middle of the upper end face of the base and has a through hole in the center, matching the inner cylinder after rotomolding of the base, and extends upward from the lower end of the base into the inner cylinder of the base to form a sealed connection with the inner cylinder rotomolded layer.

[0011] The rotomolded urea tank drain outlet, wherein: the slag plug is a central settling trough structure, and the internal thread is provided on the inner wall of the central settling trough.

[0012] The aforementioned rotomolded urea tank includes a tank body, a drain port, and a filling port; the tank body has a first assembly hole at the bottom and a second assembly hole at the top; the drain port is located at the bottom of the tank body and is welded to the first assembly hole; the filling port is located at the second assembly hole; the drain port is as described above; the positioning boss of the drain port matches the first assembly hole and is engaged with the first assembly hole during assembly. Beneficial effects

[0013] This utility model discloses a drain outlet structure for a rotomolded urea tank. This simplifies the tooling design of the drain outlet and eliminates the need for positioning devices. It prevents powder leakage during rotomolding and provides anti-cracking and anti-delamination properties after rotomolding. It is suitable for various rotomolded urea tanks with bottom drain outlets. Through an external thread design, the rotomolded layer completely covers the entire inner cylinder of the drain outlet, overcoming the problem of incomplete urea drainage caused by protrusions at the bottom of the rotomolded tank in existing technologies. Furthermore, directly connecting the sealing gasket to the rotomolded layer avoids the risk of internal leakage due to the bottom seal not directly acting on the rotomolded layer. This perfectly solves the problems of poor sealing, leakage, delamination, and cracking at the drain outlet of rotomolded urea tanks.

[0014] This utility model of rotomolded urea tank overcomes defects such as delamination and cracking of the rotomolded layer, as well as leakage caused by poor sealing of the drain port, by adopting this drain outlet, thus improving its service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the rotational molding urea tank of this utility model; Figure 2 This is a schematic diagram of the assembly structure of the drain outlet of the rotomolded urea tank of this utility model; Figure 3 This is a schematic diagram of the structure of the drain outlet of the rotomolded urea tank of this utility model; Figure 4 This is a schematic diagram of the substrate structure of the drain outlet of the rotomolded urea tank of this utility model; Figure 5 This is a schematic diagram of the filling port of the rotomolded urea tank of this utility model; Figure 6 A schematic diagram of the existing rotomolded urea tank drain outlet structure; Figure 7 A schematic diagram of the welding base for the existing rotomolded urea tank's drain and slag outlets. Detailed Implementation

[0016] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0017] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0018] In the description of the embodiments of this application, the technical terms "inner", "outer", "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, the rotational molding urea tank of this utility model includes a tank body 1, a drain outlet 2, a filling outlet 3, and a filling port 4.

[0021] The bottom of the housing body 1 is provided with a first assembly hole 11 and the top is provided with a second assembly hole 12.

[0022] The drain outlet 2 is located at the bottom of the main body 1 and is welded to the first mounting hole 11, as shown in the specific structure. Figures 2 to 4 As shown, it includes a substrate 21, a sealing gasket 22, and a slag discharge plug 23.

[0023] The base 21 is an irregularly shaped aluminum alloy cylindrical structure, with its upper end diameter larger than the first assembly hole 11 and welded to the bottom of the housing body 1. The base 21 has a positioning boss 211, an anti-detachment groove 212, and an external thread 213. The positioning boss 211 extends upward from the upper end face of the base 21 and matches the first assembly hole 11, engaging with it during assembly to position the base 21. This positioning boss 211 can be a ring structure or at least two small bosses evenly distributed circumferentially. The anti-detachment groove 212 is located on the upper inner wall of the base 21 and is an annular groove formed by radial indentation from the inner wall. It is used to fill the rotational molding material after rotational molding, serving to prevent detachment. The external thread 213 is located at the lower part of the base 21 and is a T-shaped thread. The rotational molding layer 4 extends from the inner wall of the housing body 1 through the first assembly hole 11, completely covering the inner cylinder of the base 21. The bottom of the rotational molding is flat, facilitating complete urea discharge. To further prevent detachment, a groove 214 is provided at the lower end of the inner cylinder of the base 21, and the groove 214 is formed by recessing from the lower end face.

[0024] The sealing gasket 22 is used for sealing the drain outlet. It is a self-centering sealing gasket that is used to seal the lower end of the base 21. It has a base 221 and a positioning part 222. The upper end face of the base 221 is pressed against the lower end face of the base 21. The positioning part 222 protrudes upward from the middle of the upper end face of the base 221 and has a through hole in the center. It matches the inner cylinder after the rotational molding of the base 21. It extends upward from the lower end of the base 21 into the inner cylinder of the base 21 and forms a sealing connection with the inner cylinder rotational molding layer. This allows the bottom seal to act directly on the rotational molding layer 4 to prevent internal leakage.

[0025] The slag discharge plug 23 has a central settling tank structure. The inner wall of the central settling tank is provided with internal threads, which match the external threads 213 of the base 21. After the sealing gasket 22 is installed, the slag discharge plug 23 is assembled and connected to the external threads of the base 21 through the internal threads. While fixing the sealing gasket 22, it also seals the sewage outlet a second time, further preventing the risk of internal leakage.

[0026] The filling port 3 is fixedly installed in the second mounting hole 12 of the housing body 1, such as Figure 5 As shown, it includes a metal cylinder 31, an upper cover flange 32, and a retaining ring 33; The metal cylinder 31 is used to fix the upper cover flange 32 and the fixing retaining ring 33, and is obliquely assembled at the first mounting hole 11 of the box body 1. The top cover flange 32 is fixed to the top of the cylinder 31 and is concentric with the cylinder 31. The top surface of the top cover flange 32 extends beyond the edge of the cylinder 31 and is sealed by welding. The top surface of the top cover flange 32 is evenly distributed with small holes 321 for connecting the filling port 3 metal parts.

[0027] This utility model's rotomolded urea tank drain outlet structure requires no positioning device when welded to the alloy rotomolded urea tank, and the weld is firm. After rotomolding, the rotomolded layer is embedded in the annular groove of the drain outlet, with wrapping at the top and bottom, enclosing the plastic layer at the drain outlet in the middle. Therefore, it has the advantages of rotomolding without delamination or separation, easy assembly, and universal applicability to different rotomolded urea tanks. It is suitable for the bottom drain outlet of various rotomolded urea tanks. Through the external thread design, the rotomolded layer completely covers the entire inner cylinder of the drain outlet, overcoming the problem of incomplete urea discharge due to the protrusion at the bottom of the rotomolded tank in the prior art. Furthermore, the direct connection between the sealing gasket and the rotomolded layer avoids the defect of internal leakage risk due to the bottom seal not directly acting on the rotomolded layer. This solves the problems of poor sealing, leakage, delamination, and cracking of the drain outlet of the rotomolded urea tank.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotomolded urea tank drain outlet, characterized in that: The drain outlet includes a base, a sealing gasket, and a slag discharge plug. The base is an aluminum alloy cylindrical structure with a positioning boss, an anti-detachment groove, and an external thread. The positioning boss extends upward from the upper end of the base. The anti-detachment groove is located on the upper inner wall of the base and is an annular groove formed by radial indentation from the inner wall, used for filling with rotational molding material after rotational molding. The external thread is located on the lower part of the base. The slag discharge plug has an internal thread and is fixed to the lower end of the base by assembly with the external thread of the base. The sealing gasket is located between the slag discharge plug and the lower end of the base.

2. The drain outlet of the rotomolded urea tank as described in claim 1, characterized in that: The positioning boss is a ring structure or at least two small bosses evenly arranged along the circumference.

3. The drain outlet of the rotomolded urea tank as described in claim 1, characterized in that: The external thread is a T-type thread.

4. The drain outlet of the rotomolded urea tank as described in claim 1, characterized in that: The lower end of the inner cylinder of the substrate is provided with a groove.

5. The drain outlet of the rotomolded urea tank as described in claim 1, characterized in that: The sealing gasket is a self-centering sealing gasket, having a base and a positioning part; the upper end face of the base is matched and pressed against the lower end face of the body; the positioning part protrudes upward from the middle of the upper end face of the base and has a through hole in the center, matching the inner cylinder after the rotational molding of the base, and extends upward from the lower end of the base into the inner cylinder of the base to form a sealed connection with the rotational molding layer of the inner cylinder.

6. The drain outlet of the rotomolded urea tank as described in claim 1, characterized in that: The slag discharge plug is a central settling tank structure, and the internal thread is provided on the inner wall of the central settling tank.

7. A rotomolded urea tank, comprising a tank body, a drain outlet, and a filling outlet; the tank body has a first assembly hole at its bottom and a second assembly hole at its top; the drain outlet is located at the bottom of the tank body and welded to the first assembly hole; the filling outlet is located at the second assembly hole; characterized in that: The drain outlet has the structure described in any one of claims 1-6; the positioning boss of the drain outlet matches the first assembly hole and is engaged in the first assembly hole during assembly.

Images