A high-pressure oil pipe for a heater

Abstract

The utility model discloses a high pressure oil pipe for heater relates to the field of heater fuel supply device, including bonding pipe body, first taper surface sealing structure, second taper surface sealing structure and taper pipe nut, bonding pipe body is integrally bent and is formed according to the installation path between oil pump and oil injection seat, the end part for connecting oil pump or oil injection seat of first taper surface sealing structure is integrally formed in bonding pipe body, and the sealing taper angle of first taper surface sealing structure is arranged as 128 DEG, the bonding pipe body on the inboard side of first taper surface sealing structure is integrally formed with second taper surface sealing structure, and the taper pipe nut is sleeved on bonding pipe body, and the inner taper surface of taper pipe nut is matched with second taper surface sealing structure, and two taper pipe nuts are respectively with the interface screw thread fastening connection of oil pump and oil injection seat. The utility model effectively reduces manufacturing cost and promotes overall durability, simultaneously, promotes the sealing reliability of connection interface, and fundamentally guarantees the consistency of product shape with the help of integral bending forming process.

Description

Technical Field

[0001] This utility model relates to the field of heater fuel supply devices, and in particular to a high-pressure oil pipe for heaters. Background Technology

[0002] In the heater system, the high-pressure oil pipe is a key component connecting the oil pump and the fuel injector, and its performance directly affects the reliability of fuel delivery and the overall operational stability of the heater.

[0003] Currently, the industry commonly uses copper tubing as the main material for high-pressure oil pipes, achieving a sealed connection with the oil pump and injector interface through welding copper sealing gaskets. This structure has significant shortcomings in practical applications: First, copper is expensive, and its resistance to fuel corrosion is limited, posing a risk of leakage or failure due to corrosion over long-term use. Second, the welding process is difficult to control in terms of quality, easily leading to problems such as solder clogging the oil passages, incomplete welds, or missed welds, severely affecting sealing reliability and posing safety hazards. Furthermore, existing high-pressure oil pipes are typically supplied in straight pipe form, requiring operators to bend them on-site to adapt to specific installation paths. This manual, experience-dependent processing method makes it difficult to guarantee consistency in product shape and size, resulting in differences in the spatial orientation and stress state of each pipe after assembly, affecting the product's standardization and overall performance.

[0004] Therefore, how to develop a high-pressure oil pipe for heaters that effectively reduces manufacturing costs and improves overall durability, while enhancing the sealing reliability of the connection interface and fundamentally ensuring the consistency of product shape through an integrated bending forming process, has become a technical problem that urgently needs to be solved by those in this field. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure oil pipe for heaters that effectively reduces manufacturing costs and improves overall durability. At the same time, it enhances the sealing reliability of the connection interface and fundamentally ensures the consistency of the product shape through an integrated bending forming process.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model discloses a high-pressure oil pipe for a heater, comprising a Bundy tube body, a first conical sealing structure, a second conical sealing structure, and a conical tube nut. The Bundy tube body is integrally bent and formed according to the installation path between the oil pump and the injector seat. The first conical sealing structure is integrally formed at the end of the Bundy tube body used to connect the oil pump or the injector seat. The sealing cone angle of the first conical sealing structure is set to 128° and is used to be squeezed and deformed with the inner end face of the interface of the oil pump or the injector seat during assembly to form a surface sealing structure. The second conical sealing structure is integrally formed on the Bundy tube body inside the first conical sealing structure. The sealing cone angle of the second conical sealing structure is less than 128°.

[0008] The tapered tube nut is sleeved on the Bondi tube body, and the inner tapered surface of the tapered tube nut cooperates with the second tapered surface sealing structure. The two tapered tube nuts are respectively threadedly connected to the interfaces of the oil pump and the fuel injector.

[0009] The Bondi tube body includes a metal base tube, the outer surface of which is provided with a powder coating layer, and the inner surface of which is provided with a copper plating layer.

[0010] Preferably, both the first conical sealing structure and the second conical sealing structure are formed by radial compression molding of the ends of the Bundy tube body.

[0011] Preferably, the sealing cone angle of the second conical sealing structure is set to 90°.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] 1) This utility model integrally bends the Bondi tube body according to the actual installation path and then clamps and processes it at both ends to form a first conical sealing structure and a second conical sealing structure with different cone angles. This not only ensures the high matching between the product shape and the installation space, but also significantly improves the reliability and consistency of the sealing connection.

[0014] 2) The first conical sealing structure adopts a 128° cone angle, which is conducive to generating sufficient and uniform elastic deformation during assembly and forming a stable surface seal; while the second conical sealing structure preferably adopts a 90° cone angle, which effectively converts the axial tightening force into the radial clamping force, ensuring sealing performance while taking into account structural strength and assembly convenience.

[0015] 3) In terms of manufacturing process, the processing sequence of bending the pipe first and then clamping it once to complete the forming of the end sealing structure is adopted, which avoids the errors caused by multiple clamping, thus improving both processing accuracy and production efficiency.

[0016] 4) The Bondi tubing body adopts a powder coating process on the outer surface and copper plating on the inner surface, which not only meets the anti-corrosion requirements but also ensures compatibility with fuel and extends the service life of the tubing under high pressure conditions.

[0017] 5) The design of the tapered tube nut and the double conical sealing structure makes the installation process simple and intuitive. A reliable double sealing barrier can be gradually established by tightening the nut, which reduces the difficulty of on-site assembly and helps to maintain long-term sealing stability. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of a high-pressure oil pipe for a heater according to the present invention;

[0020] Figure 2 This is a schematic diagram of the connection structure between a high-pressure oil pipe for a heater, an oil pump, and an oil injector base according to this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Oil pump; 2. Injector seat; 3. Bondi tube body; 4. First conical sealing structure; 5. Second conical sealing structure; 6. Conical tube nut. Detailed Implementation

[0022] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] like Figure 1-2 As shown, a high-pressure oil pipe for a heater includes a Bundy tube body 3, a first conical sealing structure 4, a second conical sealing structure 5, and a conical tube nut 6. The Bundy tube body 3 is integrally bent according to the installation path between the oil pump 1 and the fuel injector 2. The first conical sealing structure 4 is integrally formed at the end of the Bundy tube body 3 used to connect the oil pump 1 or the fuel injector 2. The sealing cone angle of the first conical sealing structure 4 is set to 128° and is used to be squeezed and deformed with the inner end face of the interface of the oil pump 1 or the fuel injector 2 during assembly to form a surface sealing structure. The second conical sealing structure 5 is integrally formed on the Bundy tube body 3 inside the first conical sealing structure 4. The sealing cone angle of the second conical sealing structure 5 is less than 128°.

[0024] The tapered tube nut 6 is sleeved on the Bondi tube body 3, and the inner tapered surface of the tapered tube nut 6 cooperates with the second tapered surface sealing structure 5. The two tapered tube nuts 6 are respectively threadedly connected to the interfaces of the oil pump 1 and the oil injector seat 2.

[0025] Specifically, both the first conical sealing structure 4 and the second conical sealing structure 5 are formed by radially compressing the ends of the Bondi tube body 3.

[0026] Specifically, the Bondi tube body 3 can preferably be a Bondi tube with a diameter of 5mm. First, the required fixed length is cut, and then a special tube bending tool is used to make a precise bend to ensure the consistency of the product shape.

[0027] Specifically, after the Bondi tube body 3 is bent and formed, the tapered tube nuts 6 are first fitted onto both ends of the Bondi tube body 3. Then, a special mold is used to "bulge" and "press" the ends of the Bondi tube body 3. This process is completed in one clamping operation, causing plastic deformation of the end material of the Bondi tube body, integrally forming the first conical sealing structure 4 and the second conical sealing structure 5. The sealing cone angle of the first conical sealing structure 4 is machined to 128°, and the sealing cone angle of the second conical sealing structure 5 is machined to an angle less than 128°.

[0028] Specifically, the sealing cone angle of the second conical sealing structure 5 is set to 90°.

[0029] Specifically, the sealing cone angle of the second conical sealing structure 5 is preferably 90°. Its advantage lies in the fact that this angle can more efficiently convert the axial tightening force into radial sealing pressure when tightening the tapered tube nut 6. The smaller the angle, the higher this conversion efficiency. However, an excessively small angle will weaken the structural strength and increase processing difficulty. A 90° angle, as a standard angle, achieves the best balance between tightening force transmission efficiency, structural stability, and processing convenience. It ensures that the tapered tube nut can provide sufficient and stable preload, thereby allowing the first conical sealing structure 4 to produce sufficient and uniform elastic deformation, achieving a reliable surface seal, while avoiding problems such as seizing or assembly difficulties that may occur due to an excessively small angle.

[0030] Specifically, the Bondi tube body 3 includes a metal base tube, the outer surface of which is provided with a powder coating layer, and the inner surface of which is provided with a copper plating layer.

[0031] Specifically, the metal base tube is treated with an outer layer of powder coating and an inner layer of copper plating. The metal layer of the Bundy tube itself is used as the base tube. A powder coating layer is formed on its outer surface to achieve corrosion resistance and aesthetics, and a copper plating layer is formed on its inner surface to take into account both corrosion resistance and fuel compatibility.

[0032] The usage process of this utility model is as follows:

[0033] First, when using the high-pressure oil pipe for this heater, the operator needs to place the integrally bent Bondi tube body 3 on the predetermined installation path between the oil pump 1 and the oil injector 2. Then, temporarily slide the tapered tube nuts 6 pre-fitted at both ends of the Bondi tube body 3 to the middle of the tube body. Next, insert both ends of the Bondi tube body 3 into the interfaces of the oil pump 1 and the oil injector 2 respectively, so that the first tapered sealing structure 4 and the second tapered sealing structure 5 at this end are nested together inside the interface, and the tapered surface of the first tapered sealing structure 4 is initially aligned with the boss end face inside the interface for sealing contact.

[0034] Next, slide the tapered nut 6 from the middle of the Bundy tube body 3 to the end of the inserted interface, and initially screw the external thread of the tapered nut 6 into the internal thread of the oil pump 1 or the oil injector seat 2 interface. At this time, the inner tapered surface of the tapered nut 6 begins to contact the second tapered sealing structure 5 on the Bundy tube body 3, but no significant clamping force has been generated. The high-pressure oil pipe completes the initial positioning and alignment in this step.

[0035] Next, use a tool to tighten the tapered nut 6, continuously screwing it in along the internal thread of the interface. This action pushes the inner tapered surface of the tapered nut 6 to move along the tapered surface of the second tapered sealing structure 5, thereby converting the axial thread tightening force into a radial sealing pressure force, which is transmitted to the first tapered sealing structure 4 through the second tapered sealing structure 5.

[0036] Then, under the action of continuously increasing radial clamping force, the first conical sealing structure 4 at the end of the Bondi tube body 3 is pushed towards the boss end face inside the interface and undergoes extrusion deformation. Since its sealing cone angle is set to 128°, this angle is conducive to forming sufficient and uniform elastic deformation, thereby establishing a reliable first surface sealing barrier inside the interface.

[0037] Finally, when the tapered nut 6 is tightened to the specified torque value, the high-pressure oil pipe installation is completed. At this time, the threaded force transmission mechanism formed by the second tapered sealing structure 5 and the inner tapered surface of the tapered nut 6, and the surface sealing mechanism formed by the first tapered sealing structure 4 and the inner boss end face of the interface work together to ensure that the high-pressure oil pipe achieves a long-term, stable and leak-free sealed connection between the oil pump 1 and the fuel injector 2.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A high-pressure oil pipe for a heater, used to connect an oil pump (1) and an oil injector (2), characterized in that: The assembly includes a Bondi tube body (3), a first conical sealing structure (4), a second conical sealing structure (5), and a conical tube nut (6). The Bondi tube body (3) is integrally bent and formed according to the installation path between the oil pump (1) and the fuel injector (2). The first conical sealing structure (4) is integrally formed at the end of the Bondi tube body (3) used to connect the oil pump (1) or the fuel injector (2). The sealing cone angle of the first conical sealing structure (4) is set to 128° and is used to be squeezed and deformed with the inner end face of the interface of the oil pump (1) or the fuel injector (2) during assembly to form a surface sealing structure. The second conical sealing structure (5) is integrally formed on the Bondi tube body (3) inside the first conical sealing structure (4). The sealing cone angle of the second conical sealing structure (5) is less than 128°. The tapered tube nut (6) is sleeved on the Bundy tube body (3), and the inner tapered surface of the tapered tube nut (6) is matched with the second tapered surface sealing structure (5). The two tapered tube nuts (6) are respectively threadedly connected to the interface threads of the oil pump (1) and the oil injection seat (2). The Bondi tube body (3) includes a metal base tube, the outer surface of which is provided with a powder coating layer, and the inner surface of which is provided with a copper plating layer.

2. The high-pressure oil pipe for a heater according to claim 1, characterized in that: Both the first conical sealing structure (4) and the second conical sealing structure (5) are formed by radial compression of the end of the Bundy tube body (3).

3. The high-pressure oil pipe for a heater according to claim 1, characterized in that: The sealing cone angle of the second conical sealing structure (5) is set to 90°.

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