A high pressure injection tube design structure for preventing fuel seal leakage splash

Abstract

The utility model relates to a kind of high-pressure injection pipe design structure for preventing fuel sealing leakage splashing, O-ring sealing and oil leakage hole flow guide are used between the outer thread nut of high-pressure injection pipe and high-pressure fuel joint, outer nut uses 45# carbon steel or equivalent material, variable-diameter inner hole diameter φ13mm~φ50mm, outer diameter φ16mm~φ60mm, height 20mm~80mm, thread size M16~M30, oil leakage hole inclination angle ±5°~±85°, diameter φ1mm~φ10mm;O-ring uses rubber material, wire diameter φ1.5mm~φ10mm, inner diameter φ14mm~φ58mm.The active effect of the utility model is that once high-pressure fuel sealing leakage occurs, prevent threaded connection fuel sealing leakage by O-ring sealing, oil leakage hole can flow leaked fuel to the variable-diameter inner hole of nut, avoid potential fuel sealing leakage splashing on high-temperature exhaust pipe to occur fire safety hazard;Under the condition of same oil pipe shape, effectively solve the problem of high-pressure injection pipe fuel sealing leakage splashing.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure injection pipe fuel sealing leakage technology, specifically a high-pressure injection pipe design structure to prevent fuel sealing leakage and splashing. Background Technology

[0002] In some diesel engines, the high-pressure fuel system is located close to the exhaust side. When this cannot be obstructed, the design must consider preventing fuel from splashing onto the hot exhaust pipe and potentially causing a fire in the event of a fuel seal leak. This requires a specially designed high-pressure injection pipe with O-rings to seal leaks at the threads and a drain groove to guide the leaking fuel flow to the inner diameter of the nut, preventing widespread fuel splashing. In aftermarket high-pressure injection pipes used in aftermarket engines, repeated disassembly and reassembly of the high-pressure fuel line during maintenance due to other component failures further increases the risk of fuel seal leaks. When engine layout constraints prevent changes to the high-pressure fuel inlet location, the challenge lies in preventing fuel splashing from high-pressure injection pipe leaks. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of fuel seal leakage and splashing in high-pressure injection pipes, and to provide a high-pressure injection pipe structure that prevents fuel seal leakage and splashing.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A high-pressure injection pipe structure for preventing fuel seal leakage and splashing is provided, wherein an O-ring seal and a drain hole are used between the external threaded nut of the high-pressure injection pipe and the high-pressure fuel connector.

[0005] The O-rings are made of rubber with a Shore hardness of 60°~90°.

[0006] The O-rings are made of rubber with a wire diameter of φ1.5mm~φ10mm and an inner diameter of φ14mm~φ58mm.

[0007] Nuts with external threads are made of 45# carbon steel or equivalent material.

[0008] The variable diameter inner hole of the externally threaded nut is φ13mm~φ50mm, the outer diameter is φ16mm~φ60mm, the length is 20mm~80mm, and the thread specification is M16~M30.

[0009] The oil drain hole of the nut with external thread is designed with an angle of ±5°~±85° and a diameter of φ1mm~φ10mm; 3 to 8 through holes are drilled on the threaded side of the nut, with an inclination angle of ±5°~±85° and a diameter of φ1mm~φ10mm.

[0010] Compared with the prior art, the positive effects of this utility model are: By using O-ring interference sealing, fuel leakage and splashing under certain pressure are prevented after a leak occurs, effectively sealing fuel leaks at threaded connections. Then, through the reserved leakage hole channel, the leaked fuel flows to the variable diameter inner hole of the nut. The fuel leakage is diverted and the diameter is changed, which effectively and quickly reduces the flow rate and leakage pressure, solving the problem of fuel leakage and splashing in high-pressure injection pipes. Attached Figure Description

[0011] Figure 1 Half-sectional view of an externally threaded nut with an oil drain hole; Figure 2 Half-sectional view of the assembly of nuts and oil pipes with O-rings; Figure 3 High-pressure injection pipe assembly; Figure 4. Schematic diagram of the overall structure of this application; The labels in the attached diagram are: 1. High-pressure injection pipe, 2. External threaded nut with drain hole, 3. O-ring, 4. High-pressure fuel connector. Detailed Implementation

[0012] The following provides a specific implementation of the high-pressure injection pipe design structure of this utility model that effectively prevents fuel leakage and splashing. Example

[0013] Please refer to the attached diagram. A high-pressure injection pipe design structure to prevent fuel leakage and splashing involves assembling an O-ring 3 with an externally threaded nut 2 containing a drain hole, followed by assembly with the high-pressure injection pipe 1, and finally assembly with the fuel connector on the engine. The nut has an external thread specification of M24X1.5, a variable-diameter inner hole diameter of φ13mm, a variable-diameter inner hole height of 24.5mm, a hexagonal face-to-side distance of 27mm, a total height of 40mm, a drain hole diameter of φ2.5mm, an inclination angle of 60°, and six evenly distributed drain holes. The high-pressure injection pipe has an outer diameter of φ8mm, a bending radius of R20mm, and a pipe extension length of 359mm. The O-ring is made of hydrogenated nitrile rubber with a Shore hardness of 80°, a wire diameter of φ2.5mm, and an inner diameter of φ23mm.

[0014] The O-ring is installed at the sealing position between the sealing groove of the nut and the inner hole of the fuel connector. The O-ring has an interference fit with the outer wall of the sealing groove of the nut and the inner wall of the fuel connector, causing the O-ring to deform under force, resulting in good sealing performance of fuel leakage at the thread meshing part.

[0015] When using this utility model: When installing high-pressure fuel lines, first pull the nut back to expose the fuel line head. Align the fuel line head on the injector side with the conical surface of the fitting, and then manually pre-tighten the nut and fitting threads. Simultaneously, slide the O-ring into the inner wall of the fuel inlet. Using a torque wrench, apply the set torque to tighten the nut on the high-pressure injection pipe to the correct position. On the other end of the high-pressure injection pipe, use the same method to pre-tighten the rail-side nut, and as the O-ring slides into the inner wall of the fuel inlet, apply the set torque to tighten it completely. The tightening sequence is: first the injector-side nut, then the rail-side nut. At this point, the O-ring is fully tightened, creating a fuel leak seal at the end of the threaded sealing groove. During service, even if the high-pressure fuel line is repeatedly disassembled and reassembled, the O-ring will not compromise the fuel leak seal at this location unless damaged. If the O-ring is damaged during disassembly or assembly, it should be replaced with a new one to ensure the effectiveness of the seal.

[0016] The high-pressure injection pipe of this application, which uses an O-ring seal and a guide drain nut, can effectively direct leaked fuel into the variable diameter inner hole of the nut, effectively solving the problem of fuel leakage and splashing in the high-pressure injection pipe and avoiding potential fire hazards caused by fuel leakage splashing onto the high-temperature exhaust pipe. The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-pressure injection pipe design structure to prevent fuel seal leakage and splashing, characterized in that, An O-ring seal and a drain hole are used to guide the flow between the external thread nut of the high-pressure injection pipe and the high-pressure fuel connector.

2. The high-pressure injection pipe design structure for preventing fuel seal leakage and splashing according to claim 1, characterized in that, The external thread nut is made of 45# carbon steel, with an inner diameter of φ13mm~φ50mm, an outer diameter of φ16mm~φ60mm, a height of 20mm~80mm, and a thread specification of M16~M30.

3. The high-pressure injection pipe design structure for preventing fuel seal leakage and splashing according to claim 1, characterized in that, The O-rings are made of rubber with a Shore hardness of 60°~90°, a wire diameter of φ1.5mm~φ10mm, and an inner diameter of φ14mm~φ58mm.

4. The high-pressure injection pipe design structure for preventing fuel seal leakage and splashing according to claim 1, characterized in that, An O-ring sealing groove is reserved at the end of the nut thread, with a groove diameter of φ13.5mm~φ58.5mm and a groove width of 2mm~12mm.

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