Search

CN-121701370-B - Common rail pipe with high-pressure oil pressure sealing structure

CN121701370BCN 121701370 BCN121701370 BCN 121701370BCN-121701370-B

Abstract

The invention discloses a common rail pipe with a high-pressure oil pressure sealing structure, which relates to the technical field of combustion engines and comprises a common rail pipe body, pipe connectors, a stepped pressure release assembly and a plurality of branch inclined frames, wherein the pipe connectors are used for guiding fuel oil, the stepped pressure release assembly is arranged in the pipe connectors and is provided with a conical pipe body with gradually enlarged diameter, a first porous plate and a second porous plate which can gradually reduce the pressure of the fuel oil in the pipe connectors, the stepped pressure release assembly is used for guiding the fuel oil to accelerate steadily in the rotating process of the stepped pressure release assembly, the shearing action generated when the fuel oil passes through the two plate bodies is utilized to avoid cracks caused by stress concentration on the inner wall of the pipe connectors, and the plurality of branch inclined frames are distributed in an inclined mode and are used for converting the axial flow part of the fuel oil which just enters the inside the pipe connectors into inclined flow so as to avoid cavitation damage caused by long-time vertical impact on the inner wall of the pipe connectors.

Inventors

  • CHEN BINGBING
  • SUN JIAN

Assignees

  • 无锡创捷汽车部件有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (8)

  1. 1. A common rail pipe having a high pressure oil pressure seal structure, comprising: A common rail pipe body (100); A pipe interface (312) for the delivery of fuel; the stepped pressure release assembly (1) is arranged in the pipe joint (312), the stepped pressure release assembly (1) is provided with a conical pipe body (101) with gradually enlarged diameter, a first porous plate (109) and a second porous plate (112) which can gradually reduce the pressure of fuel in the pipe joint (312), the stepped pressure release assembly is used for guiding the fuel to accelerate steadily in the rotating process of the stepped pressure release assembly (1), and the shearing action generated when the fuel passes through the two plates is utilized to avoid cracks caused by stress concentration on the inner wall of the pipe joint (312); The stress compensation type assembly (2) is provided with a plurality of first contact wheels (206) rotating circumferentially and a plurality of second contact wheels (209) in contact with the first contact wheels, and is used for driving the extrusion strip (207) to apply pressure to the stepped pressure release assembly (1) to deform through expansion and contraction after the first contact wheels (206) and the second contact wheels (209) are extruded, so that stress compensation of the inner wall of the pipe joint (312) on fuel oil is realized through a dynamic effect; The active voltage stabilizing assembly (3), the active voltage stabilizing assembly (3) is provided with two flaring blades (306) capable of moving up and down, and the liquid resistance speed reduction effect is realized by collision of the two flaring blades (306) and fuel oil; The step-type pressure release assembly (1) comprises a micro motor (106), a first gear (107), a hose (110) and a second gear (108), the first gear (107) in transmission connection with an output shaft of the micro motor is driven to synchronously rotate by the start of the micro motor (106), then the second gear (108) in meshed connection with the micro motor is driven to rotate, and the contact area between fuel and the inner walls of the first porous plate (109), the hose (110) and the second porous plate (112) can be increased along with the rotation of the first porous plate; The aperture that second perforated plate (112) surface was seted up is less than the aperture that first perforated plate (109) surface was seted up, carries out preliminary throttle of fuel through second perforated plate (112), realizes the steady flow direction of fuel through first perforated plate (109), and both cooperate and realize gentle pressure gradient decline.
  2. 2. The common rail pipe with the high-pressure oil pressure sealing structure according to claim 1, wherein the stepped pressure release assembly (1) comprises a centralized flow guide pipe (113) and branch inclined frames (114), the outer surface of the centralized flow guide pipe (113) is tightly attached to the inner wall of the pipe joint (312), and a plurality of the branch inclined frames (114) are in inclined distribution and are used for converting an axial flow part of fuel just entering the inside of a cavity of the pipe joint (312) into inclined flow so as to avoid cavitation damage caused by long-time vertical impact of the fuel on the inner wall of the pipe joint (312).
  3. 3. The common rail pipe with high-pressure oil pressure sealing structure according to claim 1, wherein the stress compensation type assembly (2) comprises a plurality of telescopic rods (204) and a plurality of return springs (205), one ends of the first contact wheels (206) are respectively connected with one ends of the telescopic rods (204), the first contact wheels (206) are driven to synchronously rotate in the rotation process of the stepped pressure release assembly (1), after the end parts of the first contact wheels (206) are extruded with the second contact wheels (209), the return springs (205) are stressed and compressed, the extruded strips (207) are driven to be extruded to a position close to the hose (110), and the hose (110) is stressed and concavely deformed to enlarge the contact surface of fuel oil and the hose (110) so as to improve the stress release effect.
  4. 4. The common rail pipe having a high-pressure oil pressure seal structure according to claim 3, wherein said stress compensation type assembly (2) comprises a plurality of reinforcing plates (208), and one side of said second contact wheels (209) is fixed to one side of the plurality of reinforcing plates (208), respectively.
  5. 5. The common rail pipe having a high-pressure oil pressure seal structure according to claim 1, wherein the stepped pressure relief assembly (1) includes a moving groove (102), a plurality of moving bars (103), a limiting sleeve (104) and a support plate (105), and the stress compensation assembly (2) includes a positioning sleeve (201), a plurality of L-shaped plates (202) and a plurality of positioning washers (203).
  6. 6. The common rail pipe with the high-pressure oil pressure sealing structure according to claim 1, wherein the active pressure stabilizing assembly (3) comprises a passive rod (301), two auxiliary sleeves (302), a tension spring (303) and four overflow holes (307), one end of the passive rod (301) is fixedly connected with the bottom of the first porous plate (109), the two auxiliary sleeves (302) are respectively and fixedly sleeved at two ends of the passive rod (301), and one end of the passive rod (301) is movably sleeved with a displacement sleeve (304).
  7. 7. The common rail pipe with the high-pressure oil pressure sealing structure according to claim 6, wherein one end of the extension spring (303) is fixedly connected with one end of the displacement sleeve (304), the displacement sleeve (304) is driven to move up and down at one end part of the passive rod (301) in the compression process of the extension spring (303), and the height of contact with fuel oil is adjusted through up and down displacement of the two flaring blades (306) so as to actively control the resistance to the fuel oil to realize a pressure stabilizing effect.
  8. 8. The common rail pipe with high-pressure oil pressure sealing structure according to claim 1, wherein a pressure sensor (300) is arranged at one end of the common rail pipe body (100), a pressure limiting valve (311) is arranged at the other end of the common rail pipe body (100), a plurality of oil outlet branches (200) are connected to the outer wall of the common rail pipe body (100), two mounting plates (313) are arranged on the outer wall of the common rail pipe body (100), and a nameplate (411) is arranged at the top of the common rail pipe body (100).

Description

Common rail pipe with high-pressure oil pressure sealing structure Technical Field The invention relates to the technical field of combustion engines, in particular to a common rail pipe with a high-pressure oil pressure sealing structure. Background The core component of the modern diesel engine common rail fuel injection system is a common rail pipe, the common rail pipe is a fuel injector which provides stable and uniform high-pressure fuel for all fuel injectors, then the high-pressure fuel is distributed to each cylinder through a high-pressure fuel pipe, the high-pressure fuel needs to bear continuous high pressure and pressure impact of the system, the common rail pipe is provided with a pressure sensor and a pressure limiting valve, the pressure sensor and the pressure limiting valve are screwed into a common rail pipe body through threads, fine threads can play a certain sealing role, an annealed copper gasket is installed at the shoulder of the sensor, and when the sensor is screwed, the gasket is flattened to fill all micro uneven parts, so that excellent static sealing is formed. The fuel output by the engine is high-pressure pulse and does not flow smoothly, the high-pressure and high-speed pulse fuel flow directly and vertically impacts the inner wall of the joint of the common rail pipe, so that the kinetic energy of the fluid is instantaneously converted into pressure energy, an instantaneous impact pressure peak value higher than the bearing pressure of the inner wall is generated, the impact force of the part can be repeatedly reflected and overlapped in a closed space of the joint of the common rail pipe, high-frequency pressure oscillation is formed, the fatigue life of the metal of the joint of the pipe under high pressure is shortened, cracks and bursts are easily generated due to fatigue, the safety is influenced, high-frequency knocking noise is generated in the vertical impact process, the impact energy cannot be absorbed smoothly, the noise of the fluid between pipelines is improved, the flow speed of the fuel at the joint of the pipe is high, and the disturbance frequency is high, so that the pressure signal measured by the installed sensor is unstable. Disclosure of Invention The invention aims to provide a common rail pipe with a high-pressure oil pressure sealing structure, which solves the problem that the high-pressure and high-speed pulse fuel flow provided by the background art directly and vertically impacts the inner wall of an interface part of the common rail pipe, so that the kinetic energy of the fluid is instantaneously converted into pressure energy, and an instantaneous impact pressure peak value higher than the bearing pressure of the inner wall is generated. The invention provides a common rail pipe with a high-pressure oil pressure sealing structure, which comprises a common rail pipe body, a pipe joint, a stepped pressure release assembly, an active pressure stabilizing assembly and a stress compensation type pressure stabilizing assembly, wherein the pipe joint is used for guiding fuel oil to be stably accelerated in the rotating process of the stepped pressure release assembly, the shearing effect is utilized when the fuel oil passes through two plate bodies, cracks are avoided due to the fact that stress on the inner wall of the pipe joint is concentrated, the stress compensation type pressure stabilizing assembly is provided with a plurality of first contact wheels and a plurality of second contact wheels which are in contact extrusion with the first contact wheels in a circumferential rotation mode, the stepped pressure release assembly is used for applying pressure to deform the stepped pressure release assembly through expansion and driving extrusion strips after the first contact wheels and the second contact wheels are extruded, the stress compensation of the inner wall of the pipe joint on the fuel oil is realized through dynamic effects, and the active pressure stabilizing assembly is provided with two flaring blades capable of moving up and down, and the impact stabilizing effect of the fuel oil is realized through two flaring blades and two moving blades. Preferably, the step pressure release assembly comprises a micro motor, a first gear, a hose and a second gear, the first gear in transmission connection with an output shaft of the micro motor is driven to synchronously rotate by the start of the micro motor, then the second gear in meshed connection with the micro motor is driven to rotate, and along with the rotation of the first porous plate, the hose and the second porous plate, the contact area between fuel and the inner wall of the three can be increased. Preferably, the aperture of seting up on the second perforated plate surface is less than the aperture of seting up on the first perforated plate surface, carries out the preliminary throttle of fuel through the second perforated plate, realizes the steady flow direction of fuel through fi