CN214741779U - Common rail pipe - Google Patents

Abstract

The utility model relates to a common rail pipe, including the body, and respectively detachably connect in two connectors at body both ends, one of them connector is used for connecting the pressure limiting valve, and another connector is used for connecting rail pressure sensor, its characterized in that: the sleeve is sleeved on at least one of the connecting heads in a sealing mode, an end connecting block corresponding to the sleeve is sleeved on the pipe body close to the end portion, an oil return cavity is formed between the inner wall of the end connecting block and the outer wall of the pipe body, one end of the sleeve is connected in the corresponding oil return cavity in a sealing mode in an inserting mode, and an oil drainage channel communicated with the oil return cavity is formed between the outer wall of the connecting head and the outer wall of the sleeve. The utility model relates to a common rail pipe, the leakproofness is better to can avoid the fuel to reveal the waste of production, the security is higher.

Description

Common rail pipe

Technical Field

The utility model relates to a diesel engine common rail system technical field specifically is a common rail pipe.

Background

The common rail pipe is used as an important component in a common rail system of the diesel engine, and is mainly used for storing high-pressure diesel oil, reducing pressure fluctuation and controlling injection pressure. Generally, a rail pressure sensor is installed at one end of the common rail pipe through a connector to measure the fuel pressure in the common rail pipe, and a pressure limiting valve is installed at the other end of the common rail pipe through the connector to limit the oil pressure in the common rail pipe. Because be threaded connection between common rail pipe and the connector, if the connector is sealed incompletely with the junction of common rail pipe, or the connector fracture, can cause common rail pipe tip oil leak to lead to the fuel extravagant, can arouse the conflagration when serious, have great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to foretell technical current situation and provide a common rail pipe, the leakproofness is better to can avoid the fuel to reveal the waste of production, the security is higher.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a common rail pipe, include the body, and respectively detachably connect in two connectors at body both ends, one of them connector is used for connecting the pressure limiting valve, and another connector is used for connecting rail pressure sensor, its characterized in that: the sleeve is sleeved on at least one of the connecting heads in a sealing mode, an end connecting block corresponding to the sleeve is sleeved on the pipe body close to the end portion, an oil return cavity is formed between the inner wall of the end connecting block and the outer wall of the pipe body, one end of the sleeve is connected in the corresponding oil return cavity in a sealing mode in an inserting mode, and an oil drainage channel communicated with the oil return cavity is formed between the outer wall of the connecting head and the outer wall of the sleeve.

In order to make the connection of the sleeve and the connector more convenient, the sleeve is in threaded connection with the connector.

Because the wall of the sleeve is usually thin, in order to avoid the influence on the bearing capacity of the sleeve caused by the sealing ring groove formed in the sleeve, a first groove is formed in the inner wall of the end connecting block, and a first sealing ring which is in sealing and abutting contact with the outer wall of the sleeve is arranged in the first groove.

In order to facilitate the assembly of the sleeve, a hexagonal part is formed on the outer wall of the other end of the sleeve. Because the existence of first sealing washer, it is great to rotate the sleeve resistance that inserts in the end connecting block, and the design of hexagonal portion can make the sleeve adopt the spanner to rotate the sleeve and realize the assembly, and is more laborsaving.

In order to avoid the situation that the connecting head is easy to break due to the fact that the connecting head is provided with the sealing ring groove, the inner wall of the other end of the sleeve is provided with a second groove, and a second sealing ring which is in sealing butt with the outer wall of the connecting head is placed in the second groove.

Generally, a flow limiting valve in a common rail system is installed at a connecting rod of a high-pressure oil path and an oil injector, the installation difficulty of the flow limiting valve and the high-pressure oil pipe is high, and when fuel oil leaks due to breakage of the high-pressure oil pipe, the flow limiting valve installed at the connecting rod of the high-pressure oil path and the oil injector cannot close an oil path in the common rail pipe, so that the flow limiting function cannot be achieved. In order to enable the flow limiting valve to better limit the flow of the common rail system, a fuel oil channel is arranged in the pipe body, a plurality of oil outlet holes communicated with the fuel oil channel are formed in the pipe body, each oil outlet hole is respectively positioned in the corresponding oil return cavity, and at least one oil outlet hole is connected with the flow limiting valve used for conducting or blocking the high-pressure oil pipe and the fuel oil channel.

In order to make the structure of the current limiting valve simpler, the current limiting valve comprises

The valve body is provided with a first connecting part which is hermetically inserted into the oil return cavity at one end and a second connecting part which is hermetically connected with the high-pressure oil pipe at the other end, and the valve body is provided with an axially through valve cavity, and a valve hole is arranged on the wall of the valve cavity;

the sealing head is provided with a first passage which is axially communicated, one end of the sealing head is hermetically inserted on the pipe body, and the other end of the sealing head is hermetically inserted in the valve cavity;

a valve needle which is axially movably arranged in the valve cavity in a penetrating way, and the valve needle can open or close the valve hole by axial movement, wherein a second passage which is communicated with the valve cavity and the first passage is arranged;

and the spring is sleeved on the valve needle and enables the valve needle to always have the trend of moving towards the sealing head.

In order to facilitate the installation of the flow limiting valve, a pressing block is detachably connected to the end connecting block, and the pressing block is sleeved on the valve body and presses the valve body towards the direction of the pipe body.

In order to facilitate recovery of fuel leaked when the high-pressure oil pipe is broken, an oil return passage which is mutually independent of the valve cavity is arranged in the valve body, and the oil return passage is used for communicating the high-pressure oil pipe with the oil return cavity.

In a further design, one end of the sealing head is a third connecting part inserted into the oil outlet, the third connecting part is in a circular truncated cone shape, and the diameter of the third connecting part is gradually increased from one end of the sealing head to the other end of the sealing head; the other end of the sealing head is a fourth connecting part inserted in the valve cavity, the fourth connecting part comprises a cylindrical section and a circular table section which are sequentially distributed along the direction from one end of the sealing head to the other end, and the diameter of the circular table section is gradually reduced along the direction from one end of the sealing head to the other end; the valve hole is round platform form, and the one end of keeping away from on the needle sealed the head be can seal the grafting in the round platform portion in the valve hole.

Compared with the prior art, the utility model has the advantages of: through sealed the sleeve that has cup jointed on at least one connector, not only make the leakproofness of the junction of connector and body better, reduce the fuel in the common rail pipe and reveal, moreover, make the sleeve inner wall, form the draining passageway with the oil return chamber intercommunication in the end connecting block between the tip outer wall of body and the connector outer wall, when the connector fracture, the sealed incomplete fuel that causes in the common rail pipe of junction of connector and body reveals, the fuel of revealing can get into back to be retrieved in the oil return chamber through the oil return passageway, avoid causing the fuel extravagant, can also reduce the conflagration potential safety hazard that the fuel revealed the existence, improve the security that the common rail pipe used.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention;

fig. 2 is a partial cross-sectional view of an embodiment of the invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

fig. 4 is a partially exploded view of an embodiment of the present invention;

fig. 5 is an exploded perspective view of a flow limiting valve according to an embodiment of the present invention;

fig. 6 is a sectional view in the direction of B-B of the flow restriction valve in fig. 3.

Wherein the reference numerals in the above figures are:

1. a pipe body; 11. a fuel passage; 12. an oil outlet hole; 2. an end connecting block; 21. a first groove; 3. a valve body; 31. a first connection portion; 311. a third groove; 32. a second connecting portion; 321. a fourth groove; 33. a first step portion; 34. a valve cavity; 35. a valve bore; 36. an oil return passage; 37. a pin hole; 4. a sealing head; 41. a third connecting portion; 42. a fourth connecting portion; 421. a cylindrical section; 422. a circular table section; 43. a first channel; 5. a valve needle; 51. a second channel; 52. perforating; 53. a circular table portion; 6. a spring; 7. briquetting; 8. a sleeve; 81. a second groove; 82. a hexagonal section; 83. an internal thread; 91. a first seal ring; 92. a second seal ring; 93. a third seal ring; 94. a fourth seal ring; 10. a connector; 100. an oil return cavity; 101. an external thread; 200. a flow-limiting valve; 300. and an oil drainage channel.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1-6, is a preferred embodiment of the present invention.

The common rail pipe in this embodiment includes main parts such as body 1, end connecting block 2, valve body 3, sealing head 4, needle 5, spring 6, briquetting 7, sleeve 8, first sealing washer 91, second sealing washer 92, third sealing washer 93, fourth sealing washer 94, connector 10.

Two connectors 10 are provided and are respectively screwed to two ends of the tube body 1 (not shown). One of the connectors 10 is used for connecting a pressure limiting valve, and the other connector 10 is used for connecting a rail pressure sensor (see fig. 1). A sleeve 8 is sleeved on each connector 10 in a sealing manner; specifically, the connector 10 is provided with an external thread 101, the sleeve 8 is provided with an internal thread 83, the inner wall of the other end of the sleeve 8 is provided with a second groove 81, and a second sealing ring 92 (see fig. 3) which is in sealing contact with the outer wall of the connector 10 is placed in the second groove 81. The end connecting blocks 2 (see fig. 1) which are in one-to-one correspondence with the sleeves 8 are respectively sleeved on the end parts of the pipe body 1 close to the two ends, and an oil return cavity 100 (see fig. 3) is formed between the inner wall of each end connecting block 2 and the outer wall of the pipe body 1. One end of the sleeve 8 is hermetically inserted in the corresponding oil return cavity 100; specifically, a first groove 21 is formed on the inner wall of the end connecting block 2, and a first sealing ring 91 (see fig. 3) which is in sealing contact with the outer wall of the sleeve 8 is placed in the first groove 21. An oil drainage passage 300 (see fig. 3) communicated with the oil return cavity 200 is formed among the inner wall of the sleeve 8, the outer wall of the end part of the pipe body 1 and the outer wall of the connector 10. A hexagonal portion 82 (see fig. 1 and 4) is formed on the outer wall of the other end of the sleeve 8.

As shown in fig. 3, the pipe body 1 has a fuel passage 11 therein, the pipe body 1 is provided with a plurality of oil outlet holes 12 communicated with the fuel passage 11, each oil outlet hole 12 is respectively located in a corresponding oil return cavity 100, and each oil outlet hole 12 is connected with a flow limiting valve 200 for communicating or blocking the high pressure oil pipe and the fuel passage 11. As shown in fig. 3 to 4, the flow restriction valve 200 includes a valve body 3, a sealing head 4, a valve needle 5, and a spring 6.

As shown in fig. 3 and fig. 5-6, one end of the valve body 3 is a first connecting portion 31 which is hermetically inserted into the oil return cavity 100; specifically, the first connecting portion 31 is provided with a third groove 311, and a third sealing ring 93 which is in sealing contact with the inner wall of the end connecting block 2 is placed in the third groove 311. The other end of the valve body 3 is provided with a second connecting part 32 which is used for being connected with a high-pressure oil pipe in a sealing way; specifically, the second connecting portion 32 is provided with a fourth groove 321, and a fourth sealing ring 94 for sealing against the inner wall of the high-pressure oil pipe is disposed in the fourth groove 321. The valve body 3 is provided with a first step part 33, the valve body 3 is sleeved with a pressing block 7 which is detachably connected with the end connecting block 2 through a screw, and the pressing block 7 is placed on the step surface of the first step part 33 and used for pressing the valve body 3 towards the direction of the pipe body 1. As shown in fig. 3 and 6, the valve body 3 has a valve chamber 34 extending axially therethrough, and a valve hole 35 is provided in a wall of the valve chamber 34. As shown in fig. 3, the valve body 3 is provided therein with an oil return passage 36 independent of the valve chamber 34 for communicating the high-pressure oil pipe and the oil return chamber 100.

As shown in fig. 3 and 5-6, one end of the sealing head 4 is a third connecting portion 41 inserted into the oil outlet hole 12, the third connecting portion 41 is in a circular truncated cone shape, and the diameter of the third connecting portion 41 gradually increases from one end to the other end of the sealing head 4, so that the third connecting portion 41 is hermetically connected with the oil outlet hole 12. As shown in fig. 4, the other end of the sealing head 4 is a fourth connecting portion 42 inserted in the valve chamber 34, the fourth connecting portion 42 includes a cylindrical section 421 and a circular truncated cone section 422 distributed in sequence from one end of the sealing head 4 to the other end, and the diameter of the circular truncated cone section 422 gradually decreases from one end of the sealing head 4 to the other end, so that the fourth connecting portion 42 is connected with the valve chamber 34 in a sealing manner. The sealing head 4 has a first passage 43 extending axially therethrough, the first passage 43 communicating with the fuel passage 11.

As shown in fig. 3 and 5-6, the valve needle 5 is axially movably disposed through the valve cavity 34, and axial movement of the valve needle 5 opens or closes the valve bore 35. Specifically, as shown in fig. 3 and 5 to 6, the valve needle 5 is provided therein with a second passage 51 communicating with the first passage 43, and the valve needle 5 is provided thereon with a plurality of perforations 52 uniformly spaced in the circumferential direction, the second passage 51 communicating with the valve chamber 34 through the perforations 52. As shown in fig. 3 and fig. 5 to 6, the valve hole 35 is circular truncated cone-shaped, and one end of the valve needle 5 away from the sealing head 4 is a circular truncated cone portion 53 which can be inserted into the valve hole 35 in a sealing manner, so that the circular truncated cone portion 53 can block the valve hole 35. The valve hole 35 is opened when the land 53 of the valve needle 5 is escaped from the valve hole 35, and the valve hole 35 is closed when the land 53 of the valve needle 5 is sealingly inserted in the valve hole 35.

As shown in fig. 3 and 6, the spring 6 is sleeved on the valve needle 5 and makes the valve needle 5 always have a tendency to move towards the sealing head 4.

The working principle of the flow limiting valve 200 in this embodiment is as follows: when the common rail pipe normally runs, due to the elastic action of the spring 6, the valve needle 5 always has the tendency of propping against the sealing head 4 towards the pipe body 1, the circular table part 53 on the valve needle 5 is separated from the valve hole 35, at the moment, the fuel oil passage 11, the first passage 43, the second passage 51 and the valve cavity 34 are sequentially communicated, the oil pressure in the valve cavity 34 and the oil pressure at the high-pressure oil pipe are kept balanced, and the common rail pipe can output high-pressure fuel oil; when the rear end of the common rail pipe fails, such as the bursting of the high-pressure oil pipe, the blockage of the fuel injector and the like, so that the oil pressure in the valve cavity 34 is unbalanced with the high-pressure oil pipe, the fuel in the fuel passage 11 can enable the valve needle 5 to move towards the valve hole 35 to the round table part 53 on the valve needle 35 to be inserted into the valve hole 35 in a sealing way against the elastic action of the spring 6, and the valve needle 5 is separated from the sealing head 4, so that the communication between the fuel passage 11 and the high-pressure oil pipe is blocked, and the fuel leakage is prevented. The assembling steps of the common rail pipe in the embodiment are as follows:

step one, a first sealing ring 91 is arranged in the first groove 21, a second sealing ring 92 is arranged in the second groove 81, a sealing ring is arranged in the connecting block 2, and then a sealing ring 8 is arranged in the outer tube 12;

secondly, inserting the pipe body 1 into the end connecting block 2;

step three, a third sealing ring 93 is arranged in a third groove 311, a fourth sealing ring 93 is arranged in a fourth groove 321, a sealing head 4, a needle valve 5 and a spring 6 are sequentially inserted into a valve cavity 34 of the valve body 3, and a fastening screw is inserted into a pin hole 37 to fix the position of the sealing head 4, so that the flow limiting valve 200 is completely assembled;

inserting the flow limiting valve 200 into the oil return cavity 100, inserting the sealing head 4 into the oil return hole 112, and fixing the flow limiting valve 200 by using a pressure plate 7, a gasket, a spring gasket and a screw to enable the sealing head 4 and the oil return hole 112 to be connected in a sealing manner;

step five, screwing the connectors 10 and the pressure limiting valve, the sensor or the choke plug into the two ends of the pipe body 1;

and step six, screwing the sleeves 8 into the two ends of the pipe body 1 to completely seal the whole common rail pipe.

Claims (10)

1. The utility model provides a common rail pipe, include body (1) and respectively detachably connect in two connectors (10) at body (1) both ends, one of them connector (10) are used for connecting the pressure limiting valve, and another connector (10) are used for connecting the rail pressure sensor, its characterized in that: wherein at least one connector (10) is gone up the seal cover and is cup jointed sleeve (8), be close to the tip on body (1) cup joint with end connecting block (2) that sleeve (8) correspond, end connecting block (2) inner wall with form back oil chamber (100) between body (1) outer wall, sleeve (8) one end is sealed to be pegged graft in the back oil chamber (100) that corresponds, just sleeve (8) inner wall the tip outer wall of body (1) with form between connector (10) outer wall with draining passageway (300) of back oil chamber (100) intercommunication.

2. A common rail pipe as defined in claim 1, wherein: the sleeve (8) is in threaded connection with the connector (10).

3. A common rail pipe as defined in claim 1, wherein: open on the end connecting block (2) inner wall has first recess (21), place in first recess (21) with sleeve (8) outer wall is sealed the first sealing washer (91) that offsets.

4. A common rail pipe according to claim 3, wherein: and a hexagonal part (82) is formed on the outer wall of the other end of the sleeve (8).

5. A common rail pipe as defined in claim 1, wherein: and a second groove (81) is formed in the inner wall of the other end of the sleeve (8), and a second sealing ring (92) which is in sealing and abutting contact with the outer wall of the connector (10) is arranged in the second groove (81).

6. A common rail pipe according to any one of claims 1 to 5, wherein: the oil return device is characterized in that a fuel oil channel (11) is arranged in the pipe body (1), a plurality of oil outlet holes (12) communicated with the fuel oil channel (11) are formed in the pipe body (1), each oil outlet hole (12) is located in a corresponding oil return cavity (100), and at least one oil outlet hole (12) is connected with a flow limiting valve (200) used for conducting or blocking a high-pressure oil pipe and the fuel oil channel (11).

7. The common rail pipe of claim 6, wherein: the flow limiting valve (200) comprises

The valve body (3) is provided with a first connecting part (31) which is used for being connected with a high-pressure oil pipe in a sealing way at one end and a second connecting part (32) which is inserted in the oil return cavity (100) in a sealing way at the other end, wherein the valve cavity (34) which is axially penetrated is arranged, and a valve hole (35) is arranged on the cavity wall of the valve cavity (34);

the sealing head (4) is inserted into the oil outlet hole (12) in a sealing mode at one end, inserted into the valve cavity (34) in a sealing mode at the other end, and provided with a first passage (43) which penetrates through the valve cavity in the axial direction;

a valve needle (5) axially movably disposed in the valve cavity (34) and axially moving the valve needle (5) to open or close the valve hole (35), wherein a second passage (51) communicating the valve cavity (34) and the first passage (43) is provided;

and the spring (6) is sleeved on the valve needle (5) and enables the valve needle (5) to always have the trend of moving towards the sealing head (4).

8. The common rail pipe of claim 7, wherein: the end connecting block (2) is detachably connected with a pressing block (7), and the pressing block (7) is sleeved on the valve body (3) and presses the valve body (3) towards the direction of the pipe body (1).

9. The common rail pipe of claim 7, wherein: an oil return passage (36) which is independent of the valve cavity (34) is arranged in the valve body (3), and the oil return passage (36) is used for communicating the high-pressure oil pipe with the oil return cavity (100).

10. The common rail pipe of claim 7, wherein: one end of the sealing head (4) is a third connecting part (41) inserted into the oil outlet hole (12), the third connecting part (41) is in a circular truncated cone shape, and the diameter of the third connecting part (41) is gradually increased from one end of the sealing head (4) to the other end; the other end of the sealing head (4) is a fourth connecting part (42) inserted in the valve cavity (34), the fourth connecting part (42) comprises a cylindrical section (421) and a circular truncated cone section (422) which are sequentially distributed along the direction from one end to the other end of the sealing head (4), and the diameter of the circular truncated cone section (422) is gradually reduced along the direction from one end to the other end of the sealing head (4); the valve hole (35) is in a circular truncated cone shape, and one end, far away from the sealing head (4), of the valve needle (5) is a circular truncated cone portion (53) which can be plugged into the valve hole (35) in a sealing mode.

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