A low pressure oil pipe

Abstract

The utility model discloses a low pressure oil pipe, it includes corrugated section metal pipe body and connecting section metal pipe body, the wall thickness of corrugated section metal pipe body is less than the wall thickness of connecting section metal pipe body, corrugated section metal pipe body and connecting section metal pipe body are fixedly connected in the welding mode, both ends of corrugated section metal pipe body are equipped with straight pipe connecting position, and the end of straight pipe connecting position is equipped with the gradually open type port, and one end of connecting section metal pipe body is embedded at straight pipe connecting position, and the end of straight pipe connecting position and connecting section metal pipe body form annular welding groove, and is equipped with the weld in annular welding groove. Low pressure oil pipe optimization obtains split combination structure, and the wrinkle density of corrugated section metal pipe body becomes big, and the wrinkle amplitude becomes big, thereby improving the telescopic deformation amount of corrugated section metal pipe body, so that the anti -vibration performance of low pressure oil pipe, deformation adaptation performance is strengthened.

Description

Technical Field

[0001] This utility model relates to low-pressure oil pipes for internal combustion engines. Background Technology

[0002] The low-pressure oil pipe is made of steel tubing and has a one-piece structure. It consists of round pipe sections and corrugated pipe sections. The round pipe sections are distributed between the corrugated pipe sections and are also located at the ends of the entire low-pressure oil pipe, serving as external connections. The corrugated pipe sections can withstand stress and deformation, acting as a buffer to absorb small-amplitude vibrations at both ends of the low-pressure oil pipe or to adapt to installation angle requirements under various working conditions. Due to the hardness of the low-pressure oil pipe material and its one-piece structure, the wall thickness of the corrugated pipe sections is the same as that of the round pipe sections. Transforming the thicker steel tubing into a corrugated structure during manufacturing is extremely difficult, resulting in low pleat density and small pleat amplitude at the corrugated pipe sections, leading to minimal expansion and contraction deformation. This, in turn, results in low vibration resistance and deformation adaptability of the low-pressure oil pipe. Here, pleat density refers to the number of pleats per unit length, and pleat amplitude refers to the height of a single pleat. Summary of the Invention

[0003] The technical problem to be solved by this invention is how to improve the vibration resistance and deformation adaptability of low-pressure oil pipes.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The low-pressure oil pipe is designed based on a split-combination structure, making the structure responsible for support and the structure responsible for expansion and contraction independent of each other, no longer using a single structure to bear both functions. The low-pressure oil pipe includes a corrugated metal pipe body and a connecting metal pipe body. The wall thickness of the corrugated metal pipe body is less than the wall thickness of the connecting metal pipe body. The corrugated metal pipe body and the connecting metal pipe body are fixedly connected by welding. Straight pipe connection portions are provided at both ends of the corrugated metal pipe body, and the ends of the straight pipe connection portions are provided with involute-shaped ports. One end of the connecting section metal pipe is embedded in the straight pipe connection part, and an annular welding groove is formed between the end of the straight pipe connection part and the connecting section metal pipe, and a weld is provided in the annular welding groove. The corrugated section metal pipe is designed to realize the function of expansion and contraction deformation, and the connecting section metal pipe is designed to realize the function of support.

[0005] The advantage of the modular structure lies in the fact that each component can be designed independently to achieve the optimal structure. In this technical solution, this is specifically reflected in the following: the corrugated metal tube can be made of thin-walled tubing, and the manufacturing process is completely unrestricted by the manufacturing requirements of other structures, ultimately resulting in a tube structure with high fold density and large fold amplitude. This expands the deformation range of the corrugated metal tube, thus benefiting the low-pressure oil pipe and significantly improving its vibration resistance and deformation adaptability. The connecting metal tube can be designed with more optimal bending structures to adapt to the installation requirements of the working conditions, allowing the low-pressure oil pipe as a whole to meet the installation angle requirements under the working conditions to the greatest extent possible through the bending structure of the connecting metal tube. In this way, the function of adapting to the installation angle requirements under the working conditions, which was originally undertaken by the corrugated metal tube, can be partially or fully realized by the connecting metal tube. The mechanical strength of the connecting metal tube is much higher than that of the corrugated metal tube, thus improving the overall mechanical strength of the low-pressure oil pipe.

[0006] The advantage of the modular structure also lies in the fact that the materials of each component can be selected according to specific needs. In this technical solution, the corrugated metal tube needs to have good flexibility while ensuring sufficient mechanical strength, and the connecting metal tube needs to have strong mechanical strength to meet the requirements of supporting itself and other parts. The corrugated metal tube and the connecting metal tube are independent of each other, providing a structural basis for selecting appropriate materials for each, and facilitating the enhancement of their respective functions through material selection.

[0007] Because the corrugated metal tube has a thinner wall, its material ductility makes it easier to process, facilitating the creation of holes or cavities. Therefore, the design incorporates a connecting section metal tube embedded within the corrugated section metal tube. Both ends of the corrugated section metal tube have involute openings. When the connecting section metal tube is embedded, a visible annular weld groove is formed. This annular weld groove is present during the welding process. Initially, this design facilitates the stable placement of a large quantity of solder. During welding, it helps control the distribution of the molten solder. After welding, it allows for visual inspection to ensure the annular weld groove is completely filled, enabling the detection of any unfilled areas. Furthermore, in the production process, the involute port of the corrugated metal tube provides a guiding structure that facilitates the insertion of the connecting section metal tube.

[0008] To precisely control the insertion depth of the connecting section metal tube into the corrugated section metal tube, a stepped hole is provided inside the straight tube connection part. The structure of the stepped hole is that a part with a large diameter and a part with a small diameter are connected on the same center line. Therefore, a stepped surface is formed in the corrugated section metal tube at the stepped hole. One end of the connecting section metal tube is embedded in the stepped hole and is located at the position of the largest diameter of the stepped hole. The stepped surface limits the maximum depth of the connecting section metal tube embedded into the corrugated section metal tube.

[0009] A weld is a permanent structure formed during the welding process, where solder is heated, melted, fused, and then cooled and solidified, connecting two metal components. To improve the connection strength between the connecting section and the corrugated section of the metal pipe, the distribution area of ​​the weld after cooling is expanded. While annular welding grooves can achieve sufficient weld distribution between the two, the cooled weld only fills the annular groove, leaving room for expansion. To further expand the weld distribution area after cooling, the weld must be guided into other structures that can be located between the connecting section and the corrugated section. Therefore, a clearance fit is made between one end of the connecting section and the straight pipe connection, and the annular welding groove communicates with the clearance. After melting, the solder diffuses into the clearance, and the cooled weld, in addition to filling the annular groove, also distributes axially along the clearance between the connecting section and the corrugated section within the stepped hole, forming a three-dimensional connection structure. This three-dimensional weld distribution effectively increases the connection strength between the connecting section and the corrugated section.

[0010] The present invention adopts the above-mentioned technical solution: the low-pressure oil pipe is optimized to obtain a split combination structure, the fold density and fold amplitude of the corrugated metal pipe body are increased, thereby improving the expansion and contraction deformation of the corrugated metal pipe body, and thus strengthening the vibration resistance and deformation adaptability of the low-pressure oil pipe. Attached Figure Description

[0011] Figure 1 is a structural schematic diagram of a low-pressure oil pipe according to this utility model; Figure 2 is a cross-sectional view at point AA in Figure 1; Figure 3 is a magnified view of a portion of Figure 2. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] As shown in Figures 1, 2, and 3, in this embodiment, the low-pressure oil pipe consists of a corrugated metal pipe section 1 and two connecting metal pipe sections 2. The structures of the connecting metal pipe sections 2 differ, but one end of each connecting metal pipe section 2 is used to connect to the corrugated metal pipe section 1. Both ends of the corrugated metal pipe section 1 have straight pipe connection parts 3. The straight pipe connection parts 3 do not have a corrugated cross-section; instead, they have stepped holes 5 inside, with involute ports at their ends. The stepped holes 5 communicate with the involute ports. The stepped holes 5 consist of a large-diameter section and a small-diameter section connected on the same centerline, forming a stepped surface on the corrugated metal pipe section 1 at the stepped holes 5. The large-diameter section of the stepped holes 5 is directly connected to the involute ports. Since the wall thickness of the corrugated section metal tube 1 is smaller than that of the connecting section metal tube 2, its end needs to be extended outward in order to form the involute port of the corrugated section metal tube 1.

[0014] One end of the connecting metal tube 2 is embedded in the stepped hole 5 at its largest diameter. During assembly, the connecting metal tube 2 is blocked by the stepped surface and cannot be further inserted into the corrugated metal tube 1. The insertion depth is precisely limited by the stepped surface of the stepped hole 5, ensuring the assembly consistency of each batch of products. Finally, an annular welding groove 4 is formed between the end of the straight pipe connection part 3 and the connecting metal tube 2. The end of the connecting metal tube 2 inserted into the stepped hole 5 is clearance-fitted with the straight pipe connection part 3, and the annular welding groove 4 communicates with the gap. During assembly, a sufficient amount of solder is placed in the annular welding groove 4, and the solder is heated. The molten solder is distributed into the annular welding groove 4 and flows into the gap between the connecting metal tube 2 and the corrugated metal tube 1 and is distributed axially. The molten solder cools to form a weld that fixes the connecting metal tube 2 and the corrugated metal tube 1.

Claims

1. A low-pressure oil pipe, characterized in that: The low-pressure oil pipe includes a corrugated metal pipe body (1) and a connecting metal pipe body (2). The wall thickness of the corrugated metal pipe body (1) is less than the wall thickness of the connecting metal pipe body (2). The corrugated metal pipe body (1) and the connecting metal pipe body (2) are fixedly connected by welding. The two ends of the corrugated metal pipe body (1) are provided with straight pipe connection parts (3). The end of the straight pipe connection part (3) is provided with an involute port. One end of the connecting metal pipe body (2) is embedded in the straight pipe connection part (3). An annular welding groove (4) is formed between the end of the straight pipe connection part (3) and the connecting metal pipe body (2). A weld is provided in the annular welding groove (4).

2. The low-pressure oil pipe according to claim 1, characterized in that: The straight pipe connection part (3) is provided with a stepped hole (5) inside. One end of the connecting section metal pipe (2) is embedded in the stepped hole (5) and is located at the position with the largest diameter of the stepped hole (5).

3. The low-pressure oil pipe according to claim 1, characterized in that: One end of the connecting section metal pipe (2) is fitted with a gap to the straight pipe connection part (3), the annular welding groove (4) is connected to the gap, and a weld is provided in the gap.

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