Quick connector for oil return pipeline of high-pressure common rail system of diesel engine

Abstract

The utility model discloses a quick connector for an oil return pipeline of a high-pressure common rail system of a diesel engine, which relates to the technical field of passenger car equipment and comprises a connector main body, one end of the connector main body is butted with a pipe joint, the other end of the pipe joint is fixedly provided with a connecting boss, and a sealing component is arranged in an inner cavity of the side wall of the connector main body. In the inserting process, the extrusion rods are synchronously inserted into the through grooves corresponding to the extrusion rods, and the piston rods are driven to synchronously move along with continuous pushing of the extrusion rods, so that the pistons are driven to move towards the bottom of the inner cavity of the piston barrel, inert gas in the piston barrel is extruded and conveyed into the air bag sealing ring through the connecting pipe, and the sealing effect is achieved. After inert gas enters the air bag sealing ring, the outer side of the air bag sealing ring is fixed by the annular fixing plate, and the inner side of the air bag sealing ring begins to expand inwards until the inert gas completely enters the sealing groove in the outer wall of the pipe joint, so that sealing of inserting connection of the pipe joint and the connector body is completed, and leakage of the device and waste of resources are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to passenger car equipment technical field, concretely is a diesel engine high pressure common rail system oil return pipeline quick plug joint. BACKGROUND

[0002] In the diesel engine common rail fuel injection system, while ensuring that high pressure fuel enters the combustion chamber for combustion through the fuel injector, a small amount of fuel will enter the oil return pipeline through the oil return port of the fuel injector, and finally return to the oil tank. The oil return pipeline is connected to the oil return port of the fuel injector through a joint.

[0003] In the prior art, the oil return joint and the fuel injector are often connected in a plug-in manner. However, the ordinary plug-in connection is prone to loosening after long-term use, and the sealing performance cannot be guaranteed, which may cause leakage and waste of resources. In addition, the plug-in connection needs to be replaced frequently, which is inconvenient. Therefore, the diesel engine high pressure common rail system oil return pipeline quick plug joint is proposed. SUMMARY

[0004] Therefore, the purpose of the utility model is to provide a diesel engine high pressure common rail system oil return pipeline quick plug joint to solve the technical problems in the background.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a diesel engine high pressure common rail system oil return pipeline quick plug joint, comprising a connector main body, one end of the connector main body is connected to a pipe joint, the other end of the pipe joint is fixedly installed with a connecting boss, a sealing assembly is arranged in the inner cavity of the side wall of the connector main body, and a clamping assembly is arranged on the outer wall of the joint between the connector main body and the connecting boss.

[0006] The sealing assembly comprises a sealing groove formed in the outer wall of the pipe joint and the inner wall of the connector main body, a plurality of through grooves are formed in the side wall of the connector main body near the pipe joint, and a piston cylinder is fixedly installed in each through groove, a piston is movably connected in the piston cylinder, a piston rod is fixedly connected to the center of the top of the piston, the other end of the piston rod extends to the outside of the piston cylinder and is fixedly connected to a connecting block, a plurality of extrusion rods are fixedly installed on the side of the connecting boss near the connector main body, and the number of extrusion rods matches the number of through grooves, a connecting pipe is fixedly connected to the bottom end of each group of piston cylinders, and the other end of each group of connecting pipes extends into the sealing groove in the inner wall of the connector main body and is fixedly connected to the same air bag sealing ring.

[0007] As a preferred technical scheme of the diesel engine high pressure common rail system oil return pipeline quick plug joint of the utility model, a first spring is fixedly connected between the bottom of the inner cavity of each group of piston cylinders and the piston.

[0008] As a kind of diesel engine high-pressure common rail system oil return pipeline quick plug connector preferred technical scheme of the utility model, annular fixed plate is fixedly installed in the sealing groove of the connecting head main body inner wall, the annular fixed plate inner wall is fixedly connected with the outside of air bag sealing ring.

[0009] As a kind of diesel engine high-pressure common rail system oil return pipeline quick plug connector preferred technical scheme of the utility model, the clamping assembly includes the fixed seat fixedly connected to the connecting head main body outer wall near the both sides of the one end of connecting boss, the fixed seat one side of two groups is provided with insertion slot, the insertion slot both ends are provided with movable chamber, and movable chamber slidingly connected with trapezoidal block, second spring is fixedly connected between the trapezoidal block and movable chamber side wall.

[0010] As a kind of diesel engine high-pressure common rail system oil return pipeline quick plug connector preferred technical scheme of the utility model, the connecting boss one end near the connecting head main body is fixedly connected with fixed plate on both sides, the fixed plate one side near the fixed seat is fixedly connected with connecting rod, the other end of connecting rod is fixedly connected with the plug plate matched with the insertion slot.

[0011] As a kind of diesel engine high-pressure common rail system oil return pipeline quick plug connector preferred technical scheme of the utility model, the trapezoidal block one side near the second spring is fixedly connected with pull rod, the other end of pull rod extends to the outside of fixed seat and is fixedly connected with pull handle, the second spring is sleeved on the outer wall of pull rod.

[0012] As a kind of diesel engine high-pressure common rail system oil return pipeline quick plug connector preferred technical scheme of the utility model, the outer wall of connecting head main body and connecting boss is fixedly connected with mounting flange, and two pairs of mounting flanges are fixedly connected by a plurality of bolts.

[0013] Summarized above, the utility model mainly has following beneficial effects:

[0014] 1, the utility model discloses a kind of inert gas in the process of plugging, extrusion rod is inserted into corresponding through slot, along with extrusion rod continues to advance, piston rod is synchronously moved, so as to drive piston to move to the bottom of piston cylinder inner chamber, extrude the inert gas inside piston cylinder, be transported to air bag sealing ring by connecting pipe, after inert gas enters air bag sealing ring, air bag sealing ring outside is fixed under annular fixed plate, inside starts to expand inward, until completely enter the sealing groove of pipe connector outer wall, so as to complete the sealing of pipe connector and connecting head main body plugging, prevent device from leaking, cause the waste of resources.

[0015] 2, the utility model discloses a connecting boss and the connecting head main part are approached to each other in the process, until the connecting boss drives fixed plate, connecting rod and the plug -in board are inserted into the slot, in this process, the plug -in board will extrude two trapezoidal blocks in the slot and move into the movable chamber, at this moment, the second spring is compressed, until the plug -in board is inserted to the bottom of the slot, and two trapezoidal blocks are reset to the top of the plug -in board by the elastic force of the second spring, the limiting of the plug -in board is completed, thereby realize the prefabricated of the connecting head main part and pipe joint, and it is convenient for subsequent installation personnel to further bolt fixed, when needing to disassemble, just pull the handle, drive the pull rod and trapezoidal block and move into the movable chamber, can release the limiting of the plug -in board, and its dismounting mode is convenient, further improve the work efficiency of installation personnel BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is whole structure schematic diagram of the utility model;

[0017] Figure 2 It is the connecting head main part and pipe joint of the utility model expansion diagram;

[0018] Figure 3 It is the connecting head main part side sectional view of the utility model;

[0019] Figure 4 It is the piston cylinder side sectional view of the utility model;

[0020] Figure 5 It is the air bag sealing ring structure schematic diagram of the utility model;

[0021] Figure 6 It is the fixed seat side sectional plan of the utility model.

[0022] In the drawing: 100, connecting head main part;200, sealing assembly;300, clamping assembly;

[0023] 110, pipe joint;120, connecting boss;130, mounting flange;140, bolt;

[0024] 210, sealing groove;220, through slot;230, piston cylinder;240, piston;250, piston rod;260, connecting block;270, extrusion rod;280, first spring;290, connecting pipe;2910, air bag sealing ring;2920, annular fixed plate;

[0025] 310, fixed seat;320, slot;330, trapezoidal block;340, pull rod;350, handle;360, second spring;370, fixed plate;380, connecting rod;390, plug -in board. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The embodiments of this utility model will be described below based on its overall structure.

[0028] A quick-connect fitting for the return line of a high-pressure common rail system for diesel engines, such as Figures 1-5 As shown, the connector includes a connector body 100, with a pipe fitting 110 abutting at one end and a connecting boss 120 fixedly installed at the other end of the pipe fitting 110. A sealing assembly 200 is provided in the inner cavity of the side wall of the connector body 100, and a locking assembly 300 is provided on the outer wall of the mating point between the connector body 100 and the connecting boss 120. The sealing assembly 200 includes a sealing groove 210 formed on the outer wall of the pipe fitting 110 and the inner wall of the connector body 100. Several equidistant circular grooves 220 are formed on the side wall of the connector body 100 near the pipe fitting 110. A piston cylinder 230 is fixedly installed in each groove 220, and a piston 240 is movably connected within the piston cylinder 230. A piston rod 250 is fixedly connected to the center of the top of the piston 240, and the other end of the piston rod 250 passes through... A connecting block 260 is fixedly connected to the outside of the piston cylinder 230. Several extrusion rods 270 are fixedly installed on the side of the connecting boss 120 near the connector body 100, and the number of extrusion rods 270 matches the number of through slots 220. A connecting pipe 290 is fixedly connected to the bottom of each set of piston cylinders 230, and the other end of each set of connecting pipes 290 extends into the sealing groove 210 of the inner wall of the connector body 100 and is fixedly connected to the same airbag sealing ring 2910. A first spring 280 is fixedly connected between the bottom of the inner cavity of each set of piston cylinders 230 and the piston 240. An annular fixing plate 2920 is fixedly installed in the sealing groove 210 of the inner wall of the connector body 100, and the inner wall of the annular fixing plate 2920 is fixedly connected to the outside of the airbag sealing ring 2910.

[0029] The installer aligns the pipe joint 110 to be inserted into the connector body 100 until the connecting boss 120 abuts against the connector body 100. During the insertion process, the plurality of extrusion rods 270 fixedly connected with the connecting boss 120 are synchronously inserted into the corresponding through slot 220, and when the extrusion rods 270 abut against the connecting block 260, the connecting block 260 is synchronously moved with the continuous advancement of the extrusion rods 270, thereby driving the piston rod 250 fixedly connected with one side of the connecting block 260 to move, and driving the piston 240 to move towards the bottom of the inner cavity of the piston cylinder 230, so as to extrude the inert gas in the piston cylinder 230 and transport the inert gas to the air bag sealing ring 2910 through the connecting pipe 290. After the inert gas enters the air bag sealing ring 2910, the inner side of the air bag sealing ring 2910 starts to expand inward under the fixation of the annular fixed plate 2920, until the air bag sealing ring 2910 completely enters the sealing groove 210 of the outer wall of the pipe joint 110, thereby completing the sealing of the pipe joint 110 and the connector body 100, preventing the device from leaking and causing waste of resources. When the piston 240 moves towards the bottom of the inner cavity of the piston cylinder 230, the first spring 280 is compressed. When it is necessary to remove and replace, the first spring 280 is used to push the piston 240 to reset, so as to draw the inert gas in the air bag sealing ring 2910 back into the piston cylinder 230, facilitating the sealing during the next insertion, and greatly improving the practicability of the device.

[0030] Please refer to Figure 1 and Figure 5 As shown, the clamping assembly 300 includes a fixed seat 310 fixedly connected to the outer wall of the connector body 100 near one end of the connecting boss 120 on both sides. The fixed seat 310 is provided with an insertion slot 320 on one side, and the insertion slot 320 is provided with a movable chamber at both ends, and a trapezoidal block 330 is slidably connected in the movable chamber. The trapezoidal block 330 is fixedly connected with the second spring 360 between the movable chamber side wall. The connecting boss 120 is fixedly connected with a fixed plate 370 on both sides near one end of the connector body 100. The fixed plate 370 is fixedly connected with a connecting rod 380 on one side near the fixed seat 310. The other end of the connecting rod 380 is fixedly connected with an insertion plate 390 matched with the insertion slot 320. The trapezoidal block 330 is fixedly connected with a pull rod 340 on one side near the second spring 360. The other end of the pull rod 340 extends to the outside of the fixed seat 310 and is fixedly connected with a pull handle 350. The second spring 360 is sleeved on the outer wall of the pull rod 340.

[0031] In the process of approaching the connecting boss 120 and the connector body 100, until the connecting boss 120 drives the fixed plate 370, the connecting rod 380 and the plug plate 390 to be inserted into the slot 320, in this process, the plug plate 390 will extrude the two trapezoidal blocks 330 in the slot 320 to move into the movable chamber, at this time the second spring 360 is compressed, until the plug plate 390 is inserted into the bottom of the slot 320, and the two trapezoidal blocks 330 are reset above the plug plate 390 by the elastic force of the second spring 360, which limits the plug plate 390, thereby realizing the pre-fixing of the connector body 100 and the pipe joint 110, facilitating the subsequent installation personnel to further fix the bolt 140, when disassembling is needed, only pull the handle 350, drive the pull rod 340 and the trapezoidal block 330 to move into the movable chamber, the limiting of the plug plate 390 can be released, the disassembly method is convenient, and the working efficiency of the installation personnel is further improved.

[0032] Please refer to Figure 1 and Figure 2 It is shown that the connector body 100 and the outer wall of the connecting boss 120 are fixedly connected with the mounting flange 130, and the two pairs of mounting flanges 130 are fixedly connected by a plurality of bolts 140.

[0033] When the pipe joint 110 and the connector body 100 are pre-fixed by the clamping assembly 300, the bolts 140 are matched with the mounting flanges 130, and the firmness and sealing performance of the device are further improved.

[0034] In use, in the process of plugging, a plurality of extrusion rods 270 are inserted into the corresponding through slots 220 at the same time, when the extrusion rod 270 abuts against the connecting block 260, with the continuous advancement of the extrusion rod 270, the connecting block 260 fixed on one side of the piston rod 250 is driven to move synchronously, thereby driving the piston 240 to move to the bottom of the inner cavity of the piston cylinder 230, extruding the inert gas in the piston cylinder 230 to be transported to the air bag sealing ring 2910 through the connecting pipe 290. After the inert gas enters the air bag sealing ring 2910, the inner side of the air bag sealing ring 2910 starts to expand inward under the fixation of the annular fixed plate 2920 on the outer side, until it completely enters the sealing groove 210 of the outer wall of the pipe joint 110, thereby completing the sealing of the pipe joint 110 and the connector body 100, preventing the device from leaking and causing waste of resources. When the piston 240 moves to the bottom of the inner cavity of the piston cylinder 230, the first spring 280 is compressed, and when it is necessary to disassemble and replace, the inert gas in the air bag sealing ring 2910 is sucked back into the piston cylinder 230 by the elastic force of the first spring 280, facilitating the sealing in the next plugging, and greatly improving the practicability of the device. The parts not involved in the device are the same as or can be realized by the existing technology.

[0035] Although the embodiments of the utility model have been shown and described, the specific embodiments are only the explanation of the utility model, and are not the limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, the person skilled in the art can make the modification, replacement and change of no creative contribution to the embodiment according to the need after reading the specification without departing from the principle and the purpose of the utility model, but as long as in the patent right claim range of the utility model, it is protected by the patent law.

Claims

1. A quick plug connector for a high pressure common rail system return line of a diesel engine, comprising a connector body (100), characterized in that: The connecting head body (100) is butted with a pipe joint (110) at one end, the pipe joint (110) is fixedly installed with a connecting boss (120) at the other end, a sealing assembly (200) is arranged in the inner cavity of the side wall of the connecting head body (100), and an engagement assembly (300) is arranged on the outer wall of the butt joint of the connecting head body (100) and the connecting boss (120). The sealing assembly (200) comprises a sealing groove (210) arranged on the outer wall of the pipe joint (110) and the inner wall of the connecting head body (100), a plurality of through grooves (220) are arranged on the side wall of the connecting head body (100) near one end of the pipe joint (110) and are distributed at equal intervals in a circle, a piston cylinder (230) is fixedly installed in each through groove (220), a piston (240) is movably connected in the piston cylinder (230), a piston rod (250) is fixedly connected to the top center of the piston (240), the piston rod (250) extends to the outside of the piston cylinder (230) at the other end and is fixedly connected with a connecting block (260), a plurality of extrusion rods (270) are fixedly installed on the connecting boss (120) near one side of the connecting head body (100) and are distributed at equal intervals in a circle, the number of the extrusion rods (270) matches the number of the through grooves (220), a connecting pipe (290) is fixedly connected to the bottom of each group of piston cylinders (230), and the other end of each group of connecting pipes (290) extends into the sealing groove (210) in the inner wall of the connecting head body (100) and is fixedly connected with the same air bag sealing ring (2910).

2. A quick connector for a high pressure common rail system return line of a diesel engine according to claim 1, characterized in that: A first spring (280) is fixedly connected between the inner cavity bottom of each group of piston cylinders (230) and the piston (240).

3. A quick connector for a high pressure common rail system return line of a diesel engine according to claim 1, characterized in that: An annular fixed plate (2920) is fixedly installed in the sealing groove (210) in the inner wall of the connecting head body (100), and the inner wall of the annular fixed plate (2920) is fixedly connected with the outside of the air bag sealing ring (2910).

4. The quick connector for a high pressure common rail system return line of a diesel engine of claim 1, wherein: The engagement assembly (300) comprises a fixed seat (310) fixedly connected to the outer wall of the connecting head body (100) near one end of the connecting boss (120), an insertion slot (320) is arranged on one side of each of the two fixed seats (310), an active cavity is arranged at both ends of the insertion slot (320), a trapezoidal block (330) is slidably connected in the active cavity, and a second spring (360) is fixedly connected between the trapezoidal block (330) and the side wall of the active cavity.

5. A quick connect fitting for a high pressure common rail system return line of a diesel engine as defined in claim 4, characterized in that: Fixed plates (370) are fixedly connected to both sides of one end of the connecting boss (120) near the connecting head body (100), a connecting rod (380) is fixedly connected to one side of the fixed plate (370) near the fixed seat (310), and an insertion plate (390) matched with the insertion slot (320) is fixedly connected to the other end of the connecting rod (380).

6. A quick connect fitting for a high pressure common rail system return line of a diesel engine as set forth in claim 4, characterized in that: The trapezoidal block (330) is fixedly connected with a pull rod (340) on one side close to a second spring (360), the other end of the pull rod (340) extends to the outside of the fixed seat (310) and is fixedly connected with a pull handle (350), and the second spring (360) is sleeved on the outer wall of the pull rod (340).

7. A quick connect fitting for a high pressure common rail system return line of a diesel engine as set forth in claim 1, characterized in that: The outer walls of the connecting head main body (100) and the connecting boss (120) are fixedly connected with mounting flanges (130), and the two pairs of mounting flanges (130) are fixedly connected through a plurality of bolts (140).

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