CN214424614U - Pressure relief device for a common rail system and corresponding common rail system - Google Patents

Abstract

A pressure relief device for a common rail system and a corresponding common rail system are disclosed, wherein the common rail system (1) comprises a high pressure part for carrying high pressure fuel and a low pressure part for carrying low pressure fuel, the pressure relief device comprising: a high pressure side connection structure (211) for communication to the high pressure portion; and a low pressure side connection structure (214) for communication to the low pressure portion; wherein the pressure relief device is configured and adapted to actively cause a restricted continuous flow of high-pressure fuel in the high-pressure portion from the high-pressure side connection structure (211) to the low-pressure side connection structure (214). A corresponding common rail system (1) is also disclosed. According to the utility model discloses, can release the pressure in the common rail effectively when the engine stops.

Description

Pressure relief device for a common rail system and corresponding common rail system

Technical Field

The utility model relates to a pressure relief device and a corresponding common rail system for common rail system.

Background

At present, common rail technology is widely adopted in the oil supply mode of vehicle engines. The common rail technology refers to a manner of supplying oil that completely separates the generation of injection pressure and the injection process from each other in a closed-loop system consisting of a high-pressure oil pump, a pressure sensor, and an Electronic Control Unit (ECU).

The high-pressure oil pump is always in an operating state when the vehicle engine is running and continuously supplies oil to the common rail. At this point, if the engine is shut down, the rail pressure in the common rail will still be high without a pressure relief path in the common rail system. If the injector is a non-leaking injector, the pressure in the common rail must be relieved in other ways. At present, the pressure is usually released by controlling the fuel injector through a software function, for example, a ball valve of the fuel injector is controlled to perform idle injection through an idle injection function of the software, and the idle injected fuel returns to a fuel tank through a return pipe. However, the dry injection function may cause the ball valve of the injector to produce more injection events, which may subject the ball valve to more severe cavitation, reducing the life of the injector.

This approach also requires calibration of the common rail system, which is relatively complex. The high rail pressure in the common rail may not be effectively relieved should the dry injection function fail. In this case, especially when the common rail system is disassembled for maintenance after the engine is shut down, the high rail pressure in the common rail is released by injection, which not only causes waste of fuel but also may cause accidental injury to maintenance personnel.

For this reason, improvements to existing common rail systems are needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an improved pressure relief device and a corresponding common rail system for common rail system.

According to an aspect of the utility model, a pressure relief device for being used for common rail system is provided, wherein, common rail system is including being used for bearing high-pressure fuel's high pressure part and being used for bearing low pressure fuel's low pressure part, pressure relief device includes: a high pressure side connection structure for communication to the high pressure section; and a low pressure side connection structure for communicating to the low pressure portion; wherein the pressure relief device is configured and adapted to actively cause the high-pressure fuel in the high-pressure portion to flow restrictedly and continuously from the high-pressure side connection structure to the low-pressure side connection structure.

According to an alternative embodiment of the invention, the pressure relief device is configured as a pressure relief plug adapted to be connected to a common rail of the common rail system.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: the pressure relief plug is configured and adapted to be connected to an oil outlet connection of the common rail, the oil outlet connection being configured and adapted to also be connected to an injector of the common rail system; the pressure relief plug is configured to have a serpentine flow path.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: the pressure relief plug includes a housing and a serpentine flow path forming structure located at least partially within the housing; the high pressure side connection structure is configured as an internal thread structure at one end of the housing; the low pressure side connection is configured as a hinged bolt-type connector.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: the housing having a through cavity in which the serpentine flow path forming structure is disposed; the serpentine-type flow path forming structure includes at least a first flow direction changing structure and a second flow direction changing structure for changing a flow direction of the fuel at least once, respectively.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: the first flow direction changing structure is arranged contiguously with the second flow direction changing structure; the first flow direction changing structure is arranged coaxially with the second flow direction changing structure.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: at least one of the first flow direction changing structure and the second flow direction changing structure is configured and adapted to change the flow direction of the fuel at least twice; the first flow direction changing structure is arranged axially spaced apart from the high pressure side connection structure with a first through hole formed therebetween; the low pressure side connection structure is arranged axially spaced apart from the second flow direction changing structure with a second through hole formed therebetween.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: the first flow direction changing structure and the second flow direction changing structure are configured and adapted to change the flow direction of the fuel at least in turn by: axial, radially outward, axial, radially inward, axial; the through cavity is configured and adapted to have the serpentine flow path forming structure loaded into the through cavity from an end of the housing remote from the high pressure portion; the second flow direction changing structure is configured as a bolt body having a hollow structure.

According to an alternative embodiment of the invention, the pressure relief device has at least one of the following features: a first end portion of the first flow direction changing structure adjacent to the high pressure portion is provided with a radially outward guide structure for flowing fuel to an outer periphery of the first flow direction changing structure; an outer peripheral axial guide structure for causing fuel to flow downstream along the outer periphery of the first flow direction changing structure is provided at the outer periphery of the first flow direction changing structure; a radially inward guide structure for causing fuel to flow radially inward from an outer periphery of the first flow direction changing structure is provided at a second end portion of the first flow direction changing structure, which is remote from the high pressure portion; the second flow direction changing structure is configured to flow fuel downstream through the hollow structure; in the assembled state, the second flow direction changing structure axially compressively retains the first flow direction changing structure.

According to another aspect of the present invention, there is provided a common rail system, wherein the common rail system includes the pressure relief device.

According to an alternative embodiment of the invention, the common rail system has at least one of the following features: the pressure relief device is connected to a common rail of the common rail system; the common rail system includes a non-leaking fuel injector.

According to the utility model discloses, can release the pressure in the common rail effectively when the engine stops.

Drawings

The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:

fig. 1 shows a schematic diagram of a common rail system for a diesel engine according to an exemplary embodiment of the present invention.

Fig. 2 shows a perspective view of a pressure relief plug according to an exemplary embodiment of the present invention.

Fig. 3 shows a cross-sectional view of the pressure relief plug shown in fig. 2.

Fig. 4 shows a cross-sectional view taken along section line B-B in fig. 3.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

Fig. 1 shows a schematic diagram of a common rail system for a diesel engine according to an exemplary embodiment of the present invention.

As shown in fig. 1, the common rail system 1 includes a high-pressure oil pump 11, a common rail 12, a control unit 13, an injector 14, and a fuel tank 15 (partially cut away in fig. 1), wherein the high-pressure oil pump 11 pressurizes fuel from the fuel tank 15 to generate high-pressure fuel and then delivers the generated high-pressure fuel to the common rail 12, and the injector 14 is connected to the common rail 12 to receive the high-pressure fuel from the common rail 12 and inject the fuel to cylinders of the engine under the control of the control unit 13. In order to ensure the cleanliness of the fuel, a fuel filter 16 is generally provided on a fuel supply path that supplies the fuel to be pressurized from the fuel tank 15 to the high-pressure fuel pump 11. The high-pressure oil pump 11 is equipped with an oil amount control unit 111 that controls the supply of fuel to its working chamber, so that the oil intake amount of the high-pressure oil pump 11 is controlled by controlling the oil amount control unit 111 by the control unit 13. The common rail 12 may be equipped with a rail pressure sensor 121 to measure the rail pressure and transmit the measured rail pressure to the control unit 13.

Further, as shown in fig. 1, the high-pressure oil pump 11 and the injector 14 are also connected to the tank 15 through respective oil passages, respectively, so as to recover the respective fuels. Normally, a check valve 17 is also provided in the oil return path of the injector 14.

The control unit 13 may be implemented as a separate controller or may be an electronic control unit of the vehicle.

It will be appreciated by those skilled in the art that the common rail system 1 comprises a high pressure section for carrying high pressure fuel and a low pressure section for carrying low pressure fuel. For example, as shown in fig. 1, a high-pressure fuel supply path 18 that supplies high-pressure fuel from the high-pressure fuel pump 11 to the common rail 12, a high-pressure fuel injection path 19 that supplies high-pressure fuel from the common rail 12 to the injectors 14 for injection, and the common rail 12 itself belong to a high-pressure portion. Besides, it is also understood that the high-pressure oil pump 11 and the corresponding portion of the injector 14 that carries the high-pressure fuel may also be regarded as belonging to the high-pressure portion. The low pressure portion includes an oil supply path for supplying the fuel to be pressurized to the high pressure oil pump 11 and oil return paths. It will be understood that the low pressure portion may also be considered to include the oil tank 15. For clarity, in fig. 1, the high pressure portions are represented by darker colors, while the low pressure portions are represented by lighter colors.

The high pressure section is generally isolated from the low pressure section. It is clearly advantageous to have an effective release of high pressure fuel in the common rail 12 if the engine is suddenly shut down in the event of high pressure fuel accumulating in the common rail 12. However, the use of a leak-free injector limits such release, which may also not be performed for various reasons, such as malfunction, by means of a dry injection operation of the injector 14. To this end, according to an exemplary embodiment of the present invention, as shown in fig. 1, the common rail system 1 may include a continuous backflow device 20, and the continuous backflow device 20 is configured and adapted to continuously backflow the high-pressure fuel in the high-pressure portion to the low-pressure portion, particularly, the tank 15, with a limit.

Those skilled in the art will appreciate that since the continuous return device 20 allows the high-pressure fuel in the high-pressure portion to continuously return to the low-pressure portion, such return must be limited in order to be able to establish the desired pressure in the common rail 12. In particular, this backflow must not affect the establishment of the desired pressure in the high-pressure section, in particular the common rail 12, by the high-pressure oil pump 11.

It should also be noted that this constant backflow is actively set, i.e. actively pursued at design time, other than due to leakage recovery. In high-pressure oil pump and sprayer, the recovery of revealing that the during operation produced does not belong to the utility model discloses the effectual initiative lasts the backward flow.

As shown in fig. 1, the continuous return apparatus 20 may include a relief plug 21 restrictively connected to a high-pressure portion, and a return line 22 connected between the relief plug 21 and a low-pressure portion, and fuel depressurized by the relief plug 21 may be returned to the low-pressure portion, such as the fuel tank 15, through the return line 22. According to an exemplary embodiment of the present invention, the pressure relief plug 21 is mounted to the drain fitting 122 of the common rail 12. Of course, those skilled in the art will appreciate that the installation position of the pressure relief plug 21 is not limited thereto, and may be installed at any other suitable position according to the actual design requirement, as long as the high-pressure fuel in the high-pressure portion can be released in a limited manner.

According to an exemplary embodiment of the present invention, the pressure relief plug 21 may be configured to be adapted to be mounted on an oil outlet fitting on the common rail 12 adapted to be connected to the injector 14. In other words, in this case, the oil outlet joint 122 can also be used for connecting the injector 14.

According to an exemplary embodiment of the present invention, the pressure relief plug 21 may be configured to have a serpentine flow path. The serpentine flow path may be referred to herein as a flow path in which at least two changes in flow direction occur. In this case, the high-pressure fuel can be caused to flow restrictively from the high-pressure portion to the low-pressure portion. In particular, by the serpentine flow path, high-pressure fuel can flow out from the outlet of the drain plug 21 without splashing.

Fig. 2 shows a perspective view of the pressure relief plug 21 according to an exemplary embodiment of the present invention. Fig. 3 shows a cross-sectional view of the pressure relief plug 21 shown in fig. 2. Fig. 4 shows a cross-sectional view taken along section line B-B in fig. 3.

As shown in fig. 2-4, the pressure relief plug 21 may include: a high-pressure side connection structure 211 for connection to a high-pressure portion of the common rail system 1, for example, to the outlet joint 122 of the common rail 12; a housing 212; a serpentine flow path forming structure 213 located at least partially within the housing 212; and a low pressure side connection structure 214 for discharging the depressurized fuel.

According to an exemplary embodiment of the present invention, the housing 212 may be configured to have a through cavity in which the serpentine flow path forming structure 213 may be disposed. At the time of pressure relief, the high-pressure fuel flows through the serpentine flow path defined in the through cavity by the serpentine flow path forming structure 213.

According to an exemplary embodiment of the present invention, housing 212 may be configured as a cylindrical, particularly cylindrical, structure, as shown in fig. 2-4.

According to an exemplary embodiment of the present invention, the high-pressure side connection structure 211 may be configured as an internal thread structure formed in the housing 212, so that the pressure relief plug 21 may be screwed onto a corresponding external thread structure on the high-pressure part, for example, the oil outlet joint 122. For example, the high pressure side connection structure 211 may be formed, preferably centrally formed, in an end portion of the housing 212 adjacent to the high pressure portion, as shown in fig. 3.

According to an exemplary embodiment of the present invention, the serpentine flow path forming structure 213 comprises at least a first flow direction changing structure 2131 and a second flow direction changing structure 2132, wherein the first flow direction changing structure 2131 and the second flow direction changing structure 2132 may change the flow direction of the fuel at least once, in particular, at every change of 90 degrees, such as a change from radial to axial or a change from axial to radial.

According to an exemplary embodiment of the present invention, the first flow direction changing structure 2131 may be arranged upstream of the second flow direction changing structure 2132.

According to an exemplary embodiment of the present invention, the first flow direction changing structure 2131 is arranged contiguously with the second flow direction changing structure 2132. Optionally, the first flow direction changing structure 2131 is arranged coaxially with the second flow direction changing structure 2132.

According to an exemplary embodiment of the present invention, at least one of the first and second flow direction changing structures 2131 and 2132 may be configured to change the flow direction of the fuel at least two times. For example, as schematically shown by a dotted line in fig. 3, the fuel reaches a first end portion of the first flow direction changing structure 2131 adjacent to the high pressure portion in an axial direction, is then changed to flow in a radially outward direction by the first end portion of the first flow direction changing structure 2131, is then changed to flow axially along the outer circumference of the first flow direction changing structure 2131 to the second flow direction changing structure 2132, and, under the action of the second flow direction changing structure 2132, is again changed from the axial direction to flow in a radially inward direction between a second end portion of the first flow direction changing structure 2131 opposite to the first end portion and an end portion of the second flow direction changing structure 2132 adjacent to the first flow direction changing structure 2131, and is then changed to flow downstream through the inside of the second flow direction changing structure 2132 in the axial direction.

According to an exemplary embodiment of the present invention, as shown in fig. 3, the first flow direction changing structure 2131 is arranged axially spaced apart from the high pressure side connecting structure 211 with the first through hole 23 formed therebetween. The first through hole 23 may have a diameter smaller than an outer diameter of the first flow direction changing structure 2131.

According to an exemplary embodiment of the present invention, the first flow direction changing structure 2131 may be configured as a cylindrical body, in particular a cylindrical body, wherein the first end of the first flow direction changing structure 2131 is provided with a first radial guiding structure, e.g. a radial guiding groove. Optionally, the radial guide groove comprises a plurality of radially extending grooves, for example comprising four radially extending grooves arranged in a cross.

It will be understood by those skilled in the art that the term "radial directing structure" means a structure that directs fuel from a relatively inward radial position, such as a central position, to the outer periphery of the first flow direction changing structure 2131, and does not mean that a portion or all of the radial directing structure must extend completely radially. For example, the radial guide grooves may be made to extend spirally outward from a central position. In any specific configuration, the fuel may be allowed to flow from a relatively inner radial position to the outer periphery of the first flow direction changing structure 2131.

Further, the radial guide structure is not necessarily provided at the first end portion of the first flow direction changing structure 2131. For example, a radial guide structure may be provided at a corresponding portion of the housing 212 to be engaged with the first end portion of the first flow direction changing structure 2131. Of course, it is also possible to arrange corresponding radial guide structures on both.

According to an exemplary embodiment of the present invention, the second end of the first flow direction changing structure 2131 is provided with a second radial guiding structure 2133, which can be seen partly in fig. 4.

To enable fuel to flow along the outer circumference of the first flow direction changing structure 2131, according to an exemplary embodiment of the present invention, the first flow direction changing structure 2131 may be configured to fit peripherally in a clearance fit in a corresponding receiving hole in the housing 212. In this case, a gap allowing fuel to flow therethrough is provided between the outer periphery of the first flow direction changing structure 2131 and the corresponding receiving hole. The position of the gap is circled in fig. 3 by a dashed circle 24.

It will be understood by those skilled in the art that a guide groove may also be configured on the outer circumference of the first flow direction changing structure 2131. In this case, the first flow direction changing structure 2131 may be fitted tightly inside the housing 212. Of course, a guide groove may be provided at a portion of the housing 212 corresponding to the outer circumference of the first flow direction changing structure 2131. The utility model discloses do not carry out any restriction to this, as long as the fuel can change between the periphery of structure 2131 and the corresponding part of casing at first flow direction and flow can downstream.

According to an exemplary embodiment of the present invention, the second flow direction changing structure 2132 may be configured as a bolt body having a hollow structure so as to be capable of being screwed into a corresponding threaded hole of the housing 212. For this purpose, the shank has an external thread. In the assembled state, the second flow direction changing structure 2132 is axially pressed against the first flow direction changing structure 2131, so that the first flow direction changing structure 2131 can be axially held.

According to an exemplary embodiment of the invention, the hollow structure of the bolt body has a tool receiving structure 2134 for receiving a tool to screw the bolt body, as shown in fig. 3-4.

According to an exemplary embodiment of the present invention, the hollow structure has an axial through hole 2135 in a side adjacent to the first flow direction changing structure 2131 that is smaller than the tool receiving structure 2134. The axial through bore 2135 may be coaxially disposed with the tool receiving structure 2134.

Similarly, a radial guide structure may also be provided at an end of the second flow direction changing structure 2132 adjacent to the first flow direction changing structure 2131, instead of or in addition to the second radial guide structure on the second end of the first flow direction changing structure 2131.

According to an exemplary embodiment of the present invention, as shown in fig. 2-3, the low pressure side connection structure 214 may be partially embedded into the housing 212.

According to an exemplary embodiment of the present invention, the low pressure side connection structure 214 is arranged axially spaced apart from the second flow direction changing structure 2132 with a second through hole 25 formed therebetween. The diameter of the second through hole 25 is designed to allow the second flow direction changing structure 2132 to be installed.

According to an exemplary embodiment of the present invention, the through cavity of housing 212 may be configured to allow serpentine flow path forming structure 213 to be loaded into the through cavity of housing 212 from an end of housing 212 remote from the high pressure portion.

According to an exemplary embodiment of the present invention, as shown in fig. 2-3, the low pressure side connection structure 214 may be configured as an articulated bolt-type connector. The hinged bolted connector may comprise a bolt 2141 and an oil return joint 2142 that may be hinged on the bolt 2141, in particular on the screw thereof. The screw of the bolt 2141 is adapted to be screwed into the female screw formed at the end of the housing 212 far from the high pressure portion, a screw passage 2143 is formed in the screw of the bolt 2141, a lateral through hole 2144 to the screw passage 2143 is formed at a side of the screw, a joint through hole 2145 is formed on the oil return joint 2142, and the joint through hole 2145 may be aligned with the lateral through hole 2144, so that the fuel flowing through the second flow direction changing structure 2132 can flow downstream through the second through hole 25, the screw passage 2143, the lateral through hole 2144, and the joint through hole 2145. A return line may be connected to the oil return connection 2142.

It will be appreciated by those skilled in the art in light of the above teachings that the continuous return apparatus 20 is not limited to the form described above, but may be embodied in any other suitable manner. For example, such a limited return flow path may be constructed even at the outlet of the high-pressure oil pump 11.

Although specific embodiments of the invention have been described in detail herein, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.

List of reference numerals

1 common rail system

11 high-pressure oil pump

12 common rail

13 control unit

14 fuel injector

15 oil tank

16 fuel oil filter

17 check valve

18 high pressure fuel supply path

19 high pressure fuel injection path

20 continuous reflux device

21 pressure relief plug

22 return line

23 first through hole

24 dotted line circle

25 second through hole

111 oil quantity control unit

121 rail pressure sensor

122 oil outlet joint

211 high-pressure side connecting structure

212 housing

213 serpentine flow path forming structure

214 low-voltage side connecting structure

2131 first flow direction changing structure

2132 second flow direction changing structure

2133 second radial guide structure

2134 tool receiving structure

2135 axial through hole

2141 bolt

2142 oil return joint

2143 screw channel

2144 lateral through hole

2145A joint through hole

Claims (11)

1. A pressure relief device for a common rail system (1), characterized in that said common rail system (1) comprises a high pressure part for carrying high pressure fuel and a low pressure part for carrying low pressure fuel, said pressure relief device comprising:

a high pressure side connection structure (211) for communication to the high pressure portion; and

a low pressure side connection structure (214) for communication to the low pressure portion;

wherein the pressure relief device is configured and adapted to actively cause a restricted continuous flow of high-pressure fuel in the high-pressure portion from the high-pressure side connection structure (211) to the low-pressure side connection structure (214).

2. The pressure relief device according to claim 1,

the pressure relief device is configured as a pressure relief plug (21) adapted to be connected to a common rail (12) of the common rail system (1).

3. The pressure relief device of claim 2, wherein the pressure relief device has at least one of the following characteristics:

the pressure relief plug (21) is adapted to be connected to an oil outlet (122) of the common rail (12), the oil outlet (122) being adapted to be connected to an injector (14) of the common rail system (1);

the pressure relief plug (21) is configured to have a serpentine flow path.

4. A pressure relief device according to claim 2 or 3, characterized in that it has at least one of the following features:

the pressure relief plug (21) comprising a housing (212) and a serpentine flow path forming structure (213) located at least partially within the housing (212);

the high pressure side connection structure (211) is configured as an internal thread structure at one end of the housing (212);

the low pressure side connection structure (214) is configured as a hinged bolt-type connector.

5. The pressure relief device of claim 4, wherein the pressure relief device has at least one of the following characteristics:

the housing (212) having a through cavity in which the serpentine flow path forming structure (213) is disposed;

the serpentine-type flow path forming structure (213) includes at least a first flow direction changing structure (2131) and a second flow direction changing structure (2132) for changing the flow direction of the fuel at least once, respectively.

6. The pressure relief device of claim 5, wherein the pressure relief device has at least one of the following characteristics:

the first flow direction changing structure (2131) is arranged adjacent to the second flow direction changing structure (2132);

the first flow direction changing structure (2131) is arranged coaxially with the second flow direction changing structure (2132).

7. The pressure relief device according to claim 5 or 6, characterized in that it has at least one of the following features:

at least one of the first flow direction changing structure (2131) and the second flow direction changing structure (2132) is configured and adapted to change the flow direction of the fuel at least twice;

the first flow direction changing structure (2131) is arranged axially spaced apart from the high pressure side connecting structure (211) with a first through hole (23) formed therebetween;

the low pressure side connection structure (214) is arranged axially spaced apart from the second flow direction changing structure (2132) with a second through hole (25) formed therebetween.

8. The pressure relief device of claim 7, wherein the pressure relief device has at least one of the following characteristics:

the first flow direction changing structure (2131) and the second flow direction changing structure (2132) are configured and adapted to change the flow direction of the fuel at least in turn by: axial, radially outward, axial, radially inward, axial;

the through-cavity is configured and adapted to have the serpentine flow path forming structure (213) loaded into the through-cavity from an end of the housing (212) remote from the high pressure portion;

the second flow direction changing structure (2132) is configured as a bolt body having a hollow structure.

9. The pressure relief device of claim 8, wherein said pressure relief device has at least one of the following characteristics:

-at a first end of the first flow direction changing structure (2131) adjacent to the high pressure part, a radially outward directing structure for fuel flow to an outer periphery of the first flow direction changing structure (2131);

an outer circumferential axial guide structure for causing fuel to flow downstream along an outer circumference of the first flow direction changing structure (2131) is provided at an outer circumference of the first flow direction changing structure (2131);

a radially inward directing structure for causing fuel to flow radially inward from an outer periphery of the first flow direction changing structure (2131) is provided at a second end portion of the first flow direction changing structure (2131) away from the high pressure portion;

the second flow direction changing structure (2132) is configured to flow fuel downstream through the hollow structure;

in an assembled state, the second flow direction changing structure (2132) axially compressively holds the first flow direction changing structure (2131).

10. Common rail system (1), characterized in that said common rail system (1) comprises a pressure relief device according to any of claims 1-9.

11. Common rail system (1) according to claim 10, characterized in that the common rail system (1) has at least one of the following features:

the pressure relief device is connected to a common rail of the common rail system (1);

the common rail system (1) comprises a leakless injector.

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